JP3474473B2 - Printing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus capable of performing double-sided printing by reversing a printing paper.

[0002]

2. Description of the Related Art For example, Japanese Patent Publication No. 3-53115 discloses a printing apparatus capable of double-sided printing.
The printing apparatus described in Japanese Patent Publication No. 3-53115 includes a plurality of printing units each having a plate cylinder, a blanket cylinder, and an impression cylinder having a diameter twice that of the plate cylinder and the blanket cylinder. A reversing cylinder having the same diameter as that of the impression cylinder is provided between the printing units.

In this printing apparatus, after printing is performed on the surface of the printing paper by the first printing unit, the printing paper is transferred from the impression cylinder to the reversing cylinder with the trailing end of the printing paper as the leading end. Is reversed, and then the next printing unit prints on the back surface of the printing paper.

Further, the applicant of the present invention has found that an impression cylinder for carrying out printing with the printing paper mounted on the outer periphery thereof, a paper feed cylinder for supplying the printing paper to the impression cylinder, and a printing for printing on the impression cylinder. A discharge cylinder that discharges the paper, and a reverse cylinder that receives the print paper discharged from the discharge cylinder as the leading edge and supplies the print paper to the paper feed cylinder again to reverse the front and back of the print paper. Japanese Patent Application No. 10-96775 has been proposed in advance.

[0005]

As described above, in a printing apparatus which reverses the front and back of a printing sheet by receiving the trailing edge of the printing sheet as the leading edge, when the length of the printing sheet in the conveying direction is changed. It becomes impossible to transfer the printing paper. Therefore, there arises a problem that the size of the printing paper cannot be changed.

The present invention has been made in order to solve the above problems, and a printing apparatus capable of reversing the printing paper even when the length of the printing paper in the conveying direction is changed. The purpose is to provide.

[0007]

According to a first aspect of the present invention, there is provided a first holding mechanism for holding an edge of a printing sheet, and printing is executed with the printing sheet mounted on the outer peripheral portion of the first holding mechanism. An impression cylinder and a second holding mechanism for holding the edge of the printing paper, a paper feed cylinder for supplying the printing paper to the impression cylinder, and a third holding mechanism for holding the edge of the printing paper. Printing ejected from the paper ejection cylinder, which is provided with a holding mechanism and which ejects the printing paper printed by the impression cylinder, and a fourth holding mechanism for holding the edge of the printing paper. A printing device having a reversing cylinder that receives the trailing edge of the paper as a leading end and supplies the printing paper to the paper feeding cylinder again to reverse the front and back of the printing paper. A first gear arranged concentrically with the cylinder, and on the side of the paper feed cylinder A second gear which is arranged concentrically with the paper feed cylinder and which meshes with the first gear; and a second gear which is arranged concentrically with the paper discharge cylinder laterally of the paper discharge cylinder. A third gear that meshes with the first gear, a fourth gear that is arranged concentrically with the reversing cylinder on the side of the reversing cylinder, and that meshes with the second gear, and the first gear And the second gear, the first gear and the third gear, and the second gear and the fourth gear while maintaining the meshing relationship,
It is characterized by comprising a displacement mechanism for changing an axial distance between the paper feed cylinder and the paper discharge cylinder.

According to a second aspect of the present invention, in the invention according to the first aspect, the displacement mechanism rotates about an axis of the impression cylinder in a state where the impression cylinder and the discharge cylinder are connected to each other. A movable first connecting member, a second connecting member which is rotatable about an axis of the paper feeding cylinder in a state where the paper feeding cylinder and the reversing cylinder are connected, and the paper ejection cylinder Third connecting with the reversing cylinder
And a drive means for rotating the first and second connecting members.

According to a third aspect of the present invention, in the second aspect of the present invention, a first aspect for changing the timing of delivery of the printing paper from the first holding mechanism to the third holding mechanism is provided. A changing mechanism, a second changing mechanism for changing the timing of delivery of the printing paper from the third holding mechanism to the fourth holding mechanism, and a fourth holding mechanism to the second holding mechanism And a third changing mechanism for changing the timing of delivery of the printing paper to and from.

According to a fourth aspect of the present invention, in the invention according to the third aspect, the first changing mechanism includes a cam mechanism attached to the first connecting member, and the second changing mechanism is A cam mechanism attached to the third connecting member is included, and the third changing mechanism includes a cam mechanism attached to the second connecting member.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

First, the structure of a printing apparatus to which the present invention is applied and the printing operation in this printing apparatus will be described.
FIG. 1 is a schematic side view of a printing apparatus according to the present invention.

This printing apparatus includes first and second plate cylinders 11,
After the image is recorded on a printing plate on which the image held on 12 is not recorded and the plate is made, the ink supplied to the printing plate is transferred to the impression cylinder 15 through the first and second blanket cylinders 13 and 14. Printing is performed by transferring to the printing paper held.

This printing apparatus has a first plate cylinder 11 movable between a first printing position shown by a solid line in FIG. 1 and an image recording position shown by a chain double-dashed line, and a first plate cylinder shown by a solid line in FIG. The second plate cylinder 12 is movable between two printing positions and the image recording position.

The first plate cylinder 11 moved to the first printing position
Around the periphery of the ink, an ink supply device 20a for supplying, for example, black (K) ink to the printing plate, an ink supply device 20b for supplying, for example, magenta (M) ink to the printing plate, and a printing plate Damping water supply devices 21a and 21b for supplying dampening water are arranged. Further, around the second plate cylinder 12 that has moved to the second printing position, an ink supply device 20c for supplying, for example, cyan (C) ink to the printing plate, and for example, yellow (Y) to the printing plate.
An ink supply device 20d for supplying the ink, and a dampening water supply device 21c for supplying the dampening water to the printing plate,
21d and are arranged. Further, around the first plate cylinder 11 or the second plate cylinder 12 that has moved to the image recording position, the plate supply section 23, the plate discharge section 24, and the image recording device 25.
And a development processing device 26 are arranged.

In this printing apparatus, the first blanket cylinder 13 is provided so as to be able to contact the first plate cylinder 11, and the second blanket is provided so as to be contactable with the second plate cylinder 12. The impression cylinder 1 provided so as to be able to contact the cylinder 14 and the first and second blanket cylinders 13 and 14 at different positions.
5, a paper feed cylinder 16 for passing the print paper supplied from the paper feed unit 27 to the impression cylinder 15, and a chain 1 for discharging the printed print paper received from the impression cylinder 15 to the paper discharge unit 28.
It has a discharge cylinder 17 around which 9 is wound, a reversing cylinder 18 for reversing the printing paper S during double-sided printing, and a blanket cleaning device 29.

The first and second plate cylinders 11 and 12 are respectively connected to a plate cylinder moving mechanism (not shown), and by driving the plate cylinder moving mechanism, the above-mentioned first or second printing position is set. It moves back and forth between the image recording position. Further, the first plate cylinder 11 rotates in synchronization with the first blanket cylinder 13 in the first printing position, and the second plate cylinder 12 rotates with the second blanket cylinder 14 in the second printing position. It is configured to rotate in synchronization. Further, a plate cylinder rotating mechanism (not shown) is disposed near the image recording position, and both the first and second plate cylinders 11 and 12 are moved to the image recording position when the plate cylinder is moved. It is configured to rotate by the drive of the rotating mechanism.

Around the first plate cylinder 11 or the second plate cylinder 12 which has moved to the image recording position, the plate supply section 23 and the plate discharge section 2 are provided.
4 and 4 are arranged.

The plate supply unit 23 includes a supply cassette 63 for accommodating a long roll printing plate on which no image is recorded in a light-tight state, and a leading end of the printing plate pulled out from the supply cassette 63. A guide member 64 and a guide roller 65 for guiding to the surface of the first plate cylinder 11 or the second plate cylinder 12, and a cutter 66 for cutting a long printing plate into a sheet-shaped printing plate. It is arranged. Further, the first and second plate cylinders 11 and 12 are provided with a pair of gripper jaws (not shown) for gripping the front end portion and the rear end portion of the printing plate supplied from the plate supply unit 23. .

The plate discharge unit 24 is provided for the first plate cylinder 1 after printing is completed.
It has a claw mechanism 73 for peeling the printing plate held on the first or second plate cylinder 12, and a conveyor mechanism 69 for conveying the printing plate peeled by the action of the claw mechanism 73 to the discharge cassette 68. .

The leading edge of the printing plate pulled out from the supply cassette 63 in the plate supply unit 23 is guided by the guide roller 65 and the guide member 64, and the gripper claw of one of the first plate cylinder 11 or the second plate cylinder 12 is held. Can be added Then, the first plate cylinder 11 or the second plate cylinder 12 is rotated by the drive of a plate cylinder rotation mechanism (not shown), and the printing plate is wound around the outer periphery of the first plate cylinder 11 or the second plate cylinder 12. .
Then, the rear end of the printing plate cut by the cutter 66 is
It is gripped by the other grip. In this state, while the first plate cylinder 11 or the second plate cylinder 12 is rotated at a low speed, the printing held on the outer peripheral portion of the first plate cylinder 11 or the second plate cylinder 12 by the image recording device 25. An image is recorded by irradiating the surface of the plate with a modulated laser beam.

On the printing plate P mounted on the outer peripheral portion of the first plate cylinder 11, by the image recording device 25, as shown in FIG. 2A, an image area 67a for printing with black ink is formed. And an image area 67b for printing with magenta ink are recorded. Further, as shown in FIG. 2B, the printing plate P mounted on the outer peripheral portion of the second plate cylinder 12 has an image area 67c for printing with cyan ink, as shown in FIG. , Image area 67d for printing with yellow ink is recorded. The image area 67a and the image area 67b are recorded at positions where they are evenly distributed (that is, 180 degrees apart from each other) when mounted on the outer peripheral portion of the first plate cylinder 11. Similarly, the image area 67c and the image area 67d
The state that the second plate cylinder 12 is mounted on the outer peripheral portion of the second plate cylinder 12 is evenly distributed (that is, 180 degrees relative to each other).
It is recorded at the position where it is separated from each other).

Further, as will be described later, in the case of performing single color printing or two color printing by this printing device,
Image areas 67a and 67b or image areas 67c and 67d
An image for printing with the same ink is recorded on each.

In the above-described embodiment, in order to simplify the structure of the first plate cylinder 11 or the second plate cylinder 12, the outer circumference of the first plate cylinder 11 or the second plate cylinder 12 Each of the two printing areas P on one printing plate P
a, 67b or 67c, 67d are provided. However, the first plate cylinder 11 or the second plate cylinder 12 is provided with two sets of gripping claws for holding the leading end portion and two holding claws for holding the rear end portion, respectively. It is also possible to have a configuration in which each of the cylinders 12 holds two printing plates P. As used in this specification, "holding a printing plate having two image areas" means holding a single printing plate having two image areas on the outer peripheral portion of the plate cylinder, and holding a single printing plate on the plate cylinder. This is a concept including a case of holding two printing plates having one image area.
Even in the latter case, the image areas of the printing plates P are evenly distributed (that is, 180 degrees from each other).
It is necessary to hold the two printing plates P on the first plate cylinder 11 or the second plate cylinder 12 in a state in which the two printing plates P are evenly distributed so that they are separated from each other.

In this case, when one to three colors are printed on one side, or monochromatic printing is performed on both sides, the image areas 67a, 67b, 67c and 67 shown in FIG.
It is not necessary to dispose the printing plate P at a position corresponding to one or two image areas of d.

Referring again to FIG. 1, as described above, the ink supply device 20a and the ink supply device 20b are provided around the first plate cylinder 11 which has moved to the first printing position. An ink supply device 20c and an ink supply device 20d are arranged around the second plate cylinder 12 that has moved to the second printing position. These ink supply devices 20a, 20
Each of b, 20c, and 20d (collectively referred to as "ink supply device 20") has a plurality of ink rollers 71 and ink fountains 72.

The ink rollers 71 of the ink supply devices 20a and 20b swing by the action of a cam or the like (not shown). By this swinging operation, the two image areas 6 formed on the printing plate P held on the outer peripheral portion of the first plate cylinder 11 are formed.
By contacting the ink roller 71 of the ink supply device 20a or 20b with any image area of 7a and 67b, the ink can be supplied only to the necessary image area. In addition, similarly, the ink supply device 20
The ink rollers 71 of c and 20d also swing by the action of a cam or the like (not shown). And by this swinging motion,
The ink roller 71 of the ink supply device 20c or 20d comes into contact with an arbitrary image area of the two image areas 67c and 67d formed on the printing plate P held on the outer peripheral portion of the second plate cylinder 12. Thus, the ink can be supplied only to the necessary image area.

The dampening water supply devices 21a, 21b, 21c and 21d (these are collectively referred to as "dampening water supply device 21") are used before the ink is supplied to the printing plate P by the ink supply device 20. Further, dampening water is supplied to the printing plate P. Of these dampening water devices 21, the dampening water supply device 21a is the image area 67a on the printing plate P.
The dampening water supply device 21b is in the image area 67b of the printing plate P, the dampening water supply device 21c is in the image area 67c of the printing plate P, and the dampening water supply device 21d is in the image area 67d of the printing plate P. Respectively, dampening water is supplied.

Below the first plate cylinder 11 or the second plate cylinder 12 that has moved to the image recording position, a development processing device 26 is arranged. The developing device 26 has a developing unit, a fixing unit, and a diaphragm unit, and is configured to be movable up and down between a standby position shown by a two-dot chain line and a developing process position shown by a solid line in FIG.

In the case of developing the printing plate P on which an image is recorded by the image recording device 25 by the developing processing device 26, when the printing plate P is rotated with the first plate cylinder 11 or the second plate cylinder, Then, the developing unit, the fixing unit and the diaphragm unit are brought into contact with each other in order.

The first and second blanket cylinders 13 and 14 provided so as to be able to contact the first and second plate cylinders 11 and 12 are
It has the same diameter as the first and second plate cylinders 11 and 12, and a blanket for ink transfer is mounted on the outer peripheral portion thereof. Then, the first and second blanket cylinders 13 and 1
The reference numeral 4 is configured so that it can be brought into and out of contact with the first and second plate cylinders 11 and 12 and the impression cylinder 15 by a cylinder inserting mechanism described later.

The diameters of the first and second blanket cylinders 13 and 14 each having a soft blanket mounted on their outer circumferences are slightly reduced by coming into contact with the first and second plate cylinders 11 and 12. The same diameter mentioned in this specification means
It also includes a case where a slight error occurs due to such a change in diameter. Further, as will be described later, the impression cylinder 1
5, the paper feed cylinder 16, the paper discharge cylinder 17, and the reversing cylinder 18 have a diameter of [1/2] of the diameters of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14. However, even in this case, an error caused by a change in the diameter or the like similar to the above is also included.

FIG. 3 is a schematic view showing a cylinder inserting mechanism for the first blanket cylinder 13. In addition, the cylinder inserting mechanism of the second blanket cylinder 14 is also the first plate cylinder 13 shown in FIG.
It has a structure similar to that of the body insertion mechanism.

An eccentric shaft 102 having a center different from that of the shaft 101 is connected to the side of the shaft 101 that rotatably supports the first blanket cylinder 13. Further, around the eccentric shaft 102, an eccentric bearing 103 whose center is different from that of the shafts 101 and 102 is arranged. Therefore, as shown in FIG. 3, the center of the shaft 101 (that is, the first blanket cylinder 1
3) 104, the center 105 of the eccentric shaft 102, and the center 106 of the eccentric bearing 103 are arranged at different positions.

The fixed plate 107 fixed to the eccentric shaft 102 and the fixed plate 108 fixed to the eccentric bearing 103 are connected by two connecting plates 111 and 112 constituting a link mechanism. The cylinder rod 114 of the air cylinder 113 is connected to the connecting portion of the two connecting plates 111 and 112.
The tip is connected. The main body of the air cylinder 113 is connected to one end of a rotating plate 116 that rotates about a shaft 115. Further, the other end of the rotating plate 116 is
It is connected to a fixed plate 118 fixed to the eccentric bearing 103 via a rod 117.

The rotating plate 116 and the shaft 120 of the eccentric member 119 are connected to each other by the two connecting plates 12 constituting the link mechanism.
1, 122 are connected. The tip end of the cylinder rod 124 of the air cylinder 123 fixed to the main body of the apparatus is connected to the connecting portion of the two connecting plates 121 and 122. Further, the worm wheel 125 connected to the eccentric member 119 is screwed with the worm gear 127 which is rotated by the drive of the motor 126.

In such a structure, when the cylinder rods 114 and 124 of the air cylinders 113 and 123 are extended, as shown in FIG. 3, the surface of the first blanket cylinder 13 and the first plate cylinder 11 are formed. And impression cylinder 15
It is a small distance from the surface of.

In this state, when the cylinder rod 114 is contracted by driving the air cylinder 113, the first blanket cylinder 13 is moved to the first blanket cylinder 13 by the action of the link mechanism by the two connecting plates 111 and 112. It moves in the direction of the plate cylinder 11 and is inserted into the first plate cylinder 11.

In this state, when the cylinder rod 124 is contracted by driving the air cylinder 123, the action of the link mechanism constituted by the two connecting plates 121, 122 and the like causes the first blanket cylinder 13 to move. It moves in the direction of the impression cylinder 15 and is put into the impression cylinder 15.
At this time, the rotating plate 116 also rotates clockwise about the shaft 115, so that the first blanket cylinder 13 is
It moves not only in five directions but also in the direction of the first plate cylinder 11. Therefore, the first plate cylinder 1 in the first blanket cylinder 13
The state of being put in 1 is maintained.

When the eccentric member 119 is rotated, the shaft 120 of the eccentric member 119 slightly moves. For this reason,
The contact pressure between the impression cylinder 15 and the first plate cylinder 11 and the first blanket cylinder 13 is adjusted by rotating the worm wheel 125 connected to the eccentric member 119 by driving the motor 126 and finely moving the shaft 120. can do.
Therefore, it is possible to adjust the printing pressure when printing using the first blanket cylinder 13.

Referring to FIG. 1 again, the blanket cleaning device 29 disposed between the first and second blanket cylinders 13 and 14 is changed from the unwinding roll to the winding roll via a plurality of pressure contact rollers. The cleaning liquid is supplied to a long cleaning cloth stuck on the route, and the cleaning cloth is brought into contact with the first and second blanket cylinders 13 and 14 and then slid to move the first cleaning cloth. The surfaces of the second blanket cylinders 13 and 14 are cleaned. In addition, the above cleaning cloth is applied to the impression cylinder 1
The surface of the impression cylinder 15 may also be cleaned by bringing it into contact with the surface of 5.

The impression cylinder 15 provided so as to be in contact with the first and second blanket cylinders 13 and 14 is the first and second plate cylinders 1.
1, 12 and first and second blanket cylinders 13, 14
It has a diameter of 1/2 of the diameter of. Further, the impression cylinder 15 has a gripper 83, which will be described later, for holding and conveying the leading end of the printing paper.

The paper feed cylinder 16 arranged adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The paper feed cylinder 16 holds and conveys the leading end portion of the print paper, which is fed one by one from the paper feed unit 27 by the reciprocating suction plate 74, by a gripper 84 described later. The leading edge of the printing paper held by the gripper 84 is moved from the paper feed cylinder 16 to the impression cylinder 15
When the printing paper is delivered to the gripper 83 of the impression cylinder 15.
Held by.

The discharge cylinder 17 disposed adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The discharge cylinder 17 has a structure in which a pair of chains 19 are wound around both ends thereof, and a plurality of grippers 85 described later are arranged on a connecting member (not shown) that connects the pair of chains 19. Has been done. The leading edge of the printing paper held by the gripper 83 of the impression cylinder 15 is held by one of the grippers 85 of the paper ejection cylinder 17 when the printing paper is transferred from the impression cylinder 15 to the paper ejection cylinder 17. Then, this printing paper is conveyed and discharged onto the paper discharge unit 28 as the chain 19 moves.

Further, the reversing cylinder 18 arranged below the impression cylinder 15 has the same diameter as the impression cylinder 15. The reversing cylinder 18 is used to reverse the front and back of the printing paper S when performing double-sided printing on the printing paper S.

As shown in FIG. 4, the reversing cylinder 18 has a gripper 86 that rotates while holding the rear end of the printing paper S held on the outer peripheral portion of the discharge cylinder 17, and the printing held by the gripper 86. It has a gripper 87 that receives the rear end of the paper S from the gripper 86 and rotates it, and transfers the rear end of the print paper S to the gripper 84 of the paper feed cylinder 16 with the rear end as the leading end. A plurality of these grippers 86, 87 are arranged at different positions that do not interfere with each other in the longitudinal direction of the reversing cylinder 18 (direction perpendicular to the plane of FIG. 4).

The gripper 86 is supported by a gear 153 rotatable about a shaft 152 provided on the reversing cylinder 18. A gear 159 is concentrically arranged on the gear 153. Further, the gripper 87 is supported by a gear 156 rotatable about a shaft 155 provided on the reversing cylinder 18. The gears 153 and 156 mesh with each other.

Further, the substantially L-shaped arm 157 is attached to the reversing cylinder 1.
8 is provided so as to be swingable around a shaft 158 provided on the shaft 8. The rack surface 161 is provided at one end of the arm 157.
Are formed. The rack surface 161 meshes with the gear 159. Further, at the other end of the arm 157, a cam follower 162 that comes into contact with a fixed cam 44 or 46 described later is provided.

Therefore, when the cam follower 162 abuts against the fixed cam 44 or 46 and swings, the grippers 86 and 87 rotate about the shafts 152 and 155 as rotation centers. Then, when the grippers 86 and 87 move to the position shown by the chain double-dashed line in FIG. 4, as will be described later,
The printing paper S is transferred from the gripper 86 to the gripper 87.

The above grippers 83, 84, 8
5,86,87 execute the opening / closing operation by the cam mechanism described later. At this time, each of the grippers 83, 8 can be selected depending on which mode, single-color printing or multi-color printing, single-sided printing or double-sided printing is performed on the printing paper S.
It is necessary to change the opening / closing operation of 4,85,86,87. Similarly, depending on whether double-sided printing or single-sided printing is performed on the printing paper S, it is necessary to change whether or not the transfer operation by the grippers 86 and 87 is executed. The change of these operations is executed by controlling the cam mechanism by a command from the control unit 140 described later.

As described above, the paper feed cylinder 16, the paper discharge cylinder 17, and the reversing cylinder 18 use the printing paper from the impression cylinder 15 for which the printing of the first surface is completed when performing double-sided printing by this printing apparatus. After receiving and reversing the printing paper,
A printing paper reversing unit that performs the front-back reversing operation of passing the pressure paper to the impression cylinder 15 again is configured.

The front / back reversing operation for the printing paper S will be described below. 5 to 7 are explanatory views showing the front and back reversing operation of the printing paper S by the printing paper reversing mechanism. In addition,
In these figures, for convenience of explanation, the grippers 83, 84 in the impression cylinder 15, the paper feed cylinder 16 and the paper discharge cylinder 17,
Illustration of a part of 85 is omitted.

Impression cylinder 15 and first and second blanket cylinders 1
As shown in FIG. 5A, the leading end portion of the printing paper S that has been printed by passing between the sheets 3 and 14 is held by the gripper 85 of the paper discharge cylinder 17. Then, as shown in FIG. 5B, the printing paper S is conveyed along the chain 19 as the gripper 85 moves together with the chain 19. Then, the rear end portion of the printing paper S is adsorbed by the adsorption mechanism 163 provided on the paper ejection cylinder 17 and held on the surface of the paper ejection cylinder 17.

Subsequently, as shown in FIG. 6A, the rear end of the printing paper S is held by the gripper 86 of the reversing cylinder 18. Then, as shown in FIG. 6B, the printing paper S is transferred from the paper discharge cylinder 17 to the reversing cylinder 18 as the reversing cylinder 18 rotates.

While the reversing cylinder 18 is rotating, the cam follower 162 of the arm 157 provided on the reversing cylinder 18 comes into contact with a cam (not shown), whereby the arm 157 swings. Accordingly, as shown in FIG. 7A, the gripper 8
6 and 87 rotate to transfer the print sheet S between them. Then, as shown in FIG. 7B, as the reversing cylinder 18 continues to rotate, the printing paper S is held by the gripper 87 with the rear end of the printing paper S as the leading end,
It is conveyed in the direction of the paper feed cylinder 16. The printing paper S is the same as the printing paper S newly supplied from the paper feeding unit 27.
It is supplied to the impression cylinder 15 via the paper feed cylinder 16.

As described above, the printing paper S is passed from the impression cylinder 15 through the discharge cylinder 17, the reversing cylinder 18 and the paper feed cylinder 16 and then to the impression cylinder 15 again. The front / back inversion operation of is executed.

Here, when the rear end of the printing paper S is held again on the outer peripheral portion of the impression cylinder 15 with respect to the position of the printing paper S when the front end of the printing paper S is separated from the outer peripheral portion of the impression cylinder 15, The position of the printing paper S is delayed in phase by a distance twice the outer circumference of the impression cylinder 15. Therefore, the printing paper S, after performing the front-back reversing operation, has the phase delayed by the same distance as the outer circumference of the first and second plate cylinders 11 and 12 in the impression cylinder 15.
It will be handed over to position 5 above.

When the length of the printing paper S in the carrying direction is changed by changing the size of the printing paper S, the rear end portion of the printing paper S by the gripper 86 of the reversing cylinder 18 shown in FIG. 6A. It is necessary to change the hold timing of. The configuration of the displacement mechanism for changing the holding timing will be described later in detail.

Referring again to FIG. 1, the paper feed cylinder 16 is
It is connected to a drive motor via a belt (not shown). The paper feed cylinder 16, the impression cylinder 15, the paper discharge cylinder 17, the reversing cylinder 18, and the first and second blanket cylinders 13 and 14 are connected by gears attached to their ends. Further, the first blanket cylinder 13 and the first plate cylinder 11 moved to the first printing position, and the second blanket cylinder 14 and the second plate cylinder 12 moved to the second printing position,
They are connected by gears attached to their ends.
Therefore, by the drive of a drive motor (not shown), the paper feed cylinder 16, the impression cylinder 15, the paper discharge cylinder 17, the reversing cylinder 18, the first and second blanket cylinders 13 and 14, the first and second plate cylinders. 11 and 12 rotate in synchronization with each other.

FIG. 8 is a block diagram showing the main electrical construction of this printing apparatus. This printing device includes a ROM 141 in which an operation program necessary for controlling the device is stored,
RAM 142 in which data and the like are temporarily stored during control
And a CPU 143 that executes a logical operation. This control unit 140 includes an ink supply device 20, an image recording device 25, a development processing device 26, a blanket cleaning device 29, and an interface 144 via an interface 144.
A moving mechanism for the first and second plate cylinders 11 and 12, a cylinder inserting mechanism for the first and second blanket cylinders 13 and 14, first and second cam mechanisms 100 and 200, and a releasing mechanism 30 which will be described later.
It is connected to a drive circuit 145 that generates a drive signal for a drive unit etc. The printing apparatus uses this control unit 140
And performs a plate making operation and a printing operation described later.

Next, plate making and printing operations by this printing apparatus will be described. FIG. 9 is a flowchart showing an outline of plate making and printing operations by this printing apparatus.

First, a plate making process is carried out in which an image is recorded on the printing plate P on the first and second plate cylinders 11 and 12, and a developing process is performed (step S1). This plate making process is executed according to the process shown in the flowchart of FIG. 10 as a subroutine.

That is, first, the first plate cylinder 11 is shown in FIG.
In step S11, the plate is moved to the plate making position indicated by the chain double-dashed line.

Next, the printing plate P is supplied to the outer periphery of the first plate cylinder 11 (step S12). The supply of this printing plate P is
This is performed by gripping the leading edge of the printing plate P pulled out from the supply cassette 63 and the trailing edge of the printing plate P cut by the cutter 66 with a pair of grippers (not shown).

Then, an image is recorded on the printing plate P held on the outer periphery of the first plate cylinder 11 (step S13). The recording of this image is modulated from the image recording device 25 to the printing plate P held on the outer periphery of the first plate cylinder 11 while rotating the first plate cylinder 11 at a low speed by a plate cylinder rotating mechanism (not shown). It is performed by irradiating a laser beam.

Next, the printing plate P on which the image is recorded is developed (step S14). In this developing process, the developing device 26 is raised from the standby position shown by the chain double-dashed line in FIG. 1 to the developing position shown by the solid line, and then the first plate cylinder 1 is moved.
This is performed by bringing the developing unit, the fixing unit, and the diaphragm unit into contact with the printing plate P that rotates together with 1.

When the above developing process is completed, the first plate cylinder 1
1 is moved to the first printing position indicated by the solid line in FIG. 1 (step S15).

Subsequently, the plate making process for the printing plate P held on the outer periphery of the second plate cylinder 12 is executed by the same operation as the above steps S11 to S15 (steps S16 to S16).
S20). When the plate making on the printing plate P held on the outer peripheries of the first and second plate cylinders 11 and 12 is completed, the plate making process is ended.

Referring to FIG. 9 again, when the plate making process is completed, a printing process for printing on the printing paper using the printing plate P on the first and second plate cylinders 11 and 12 is executed (step S
2). The operation of the printing apparatus in this printing process will be described later in detail.

When the printing process is completed, the printing plate P used for printing is discharged (step S3). In order to discharge the printing plate P, first, the first plate cylinder 11 is moved to the plate making position shown by the chain double-dashed line in FIG. Then, after rotating the first plate cylinder 11 counterclockwise and peeling off the end of the printing plate P held on the first plate cylinder 11 by the pawl mechanism 73, the printing plate P is conveyed by the conveyor mechanism. The sheet is guided by 69 and discharged into the discharge cassette 68. And
After returning the first plate cylinder 11 to the first printing position,
Move the plate cylinder 12 of the second from the second printing position to the plate making position,
By performing the same operation as described above, the second plate cylinder 12
The printing plate P held above is discharged into the discharge cassette 68.

When the discharging process of the printing plate P is completed,
The second blanket cylinders 13 and 14 are washed (step S4). When the first and second blanket cylinders 13 and 14 are washed, the first and second blanket cylinders shown in FIG.
The blanket cylinders 13, 14 of the first and second plate cylinders 11,
After being separated from 12 and the impression cylinder 15, the first and second blanket cylinders 13 and 14 are rotated. In this state, the cleaning cloth supplied with the cleaning liquid in the blanket cleaning device 29 is brought into contact with the surfaces of the first and second blankets 13 and 14 and then slid to move the first and second cleaning cloths.
The blanket cylinders 13 and 14 are washed.

When the cleaning of the first and second blanket cylinders 13 and 14 is completed, it is confirmed whether or not another printing work is to be performed (step S5). When performing another printing operation, the operations of steps S1 to S4 are repeated.

When the printing operation is completed, the ink is washed (step S6). The cleaning of the ink is executed by removing and cleaning the ink adhering to the ink roller 71 and the ink fountain 72 in each ink supply device 20 by an ink cleaning device (not shown) provided in each ink supply device 20. .

When the ink washing step is completed, all steps are completed.

Next, the operation of the printing apparatus in the above printing process will be described. As will be described below, in order to selectively execute printing in various modes such as single-color printing, multi-color printing, single-sided printing, and double-sided printing in this printing apparatus, a gripper in the impression cylinder 15 is used. 8
3, the gripper 84 in the paper feed cylinder 16, the gripper 85 in the paper discharge cylinder 17, and the gripper 8 in the reversing cylinder 18.
It is necessary to control the opening / closing operation of 6, 87. This impression cylinder 1
No. 5 gripper 83, paper feed cylinder 16 gripper 84, paper discharge cylinder 17 gripper 85 and reversing cylinder 1
The configuration of the opening / closing mechanism for controlling the opening / closing operation of the grippers 86 and 87 in No. 8 will be described later in detail.

First, the printing paper S is printed with yellow, magenta,
The printing operation when four-color printing is performed using four color inks of cyan and black will be described. 11 to 16
FIG. 6 is an explanatory diagram showing a printing operation when four-color printing is performed by this printing device.

It should be noted that these figures and FIGS.
In FIG. 27, for convenience of description, the length of the printing paper S and the circumferences of the impression cylinder 15, the paper feed cylinder 16, the paper discharge cylinder 17, and the reversing cylinder 18 are expressed as the same, but in reality, The length of the printing paper S is shorter than the circumference of the impression cylinder 15, the paper feed cylinder 16, the paper discharge cylinder 17, and the reversing cylinder 18. In addition, in FIGS. 11 to 16, for convenience of description, the reference numeral K is assigned to the region of the first plate cylinder 11 and the first blanket cylinder 13 on the side used for printing black ink, and Of the plate cylinder 11 and the first blanket cylinder 13 of the second plate cylinder 12 and the second blanket cylinder 14 are labeled cyan. Symbol C on the side used for printing the ink of the second plate cylinder 12 and the second plate cylinder
A region Y of the blanket cylinder 14 on the side used for printing the yellow ink is denoted by a symbol Y.

In the plate making process prior to the printing process, as described above, the printing plate P mounted on the outer peripheral portion of the first plate cylinder 11 has a black ink as shown in FIG. 2 (a). An image area 67a for printing with and a image area 67b for printing with magenta ink are recorded, and the printing plate P mounted on the outer peripheral portion of the second plate cylinder 12 is recorded.
2B, it is assumed that an image area 67c for printing with cyan ink and an image area 67d for printing with yellow ink are recorded.

Further, as described above, the ink supply device 2
0a is supplied with black ink, ink supply device 20b is supplied with magenta ink, ink supply device 20c is supplied with cyan ink, and ink supply device 20d is supplied with yellow ink. In the image area 67a of the printing plate P, black ink is supplied from the ink supply device 20a, in the image area 67b, magenta ink is supplied from the ink supply device 20b, and in the image area 67c, cyan ink is supplied from the ink supply device 20c. , Image area 67d
The yellow ink is supplied from the ink supply device 20d.

First, each dampening water supply device 21 and each ink supply device 20 are brought into contact with only corresponding image areas of the printing plates P held on the first and second plate cylinders 11 and 12. . As a result, each of the image areas 67a, 67b, 67
The corresponding dampening water supply devices 21a and 21c
The dampening water is supplied from b, 21c, and 21d, and the image area 67a is supplied from the ink supply device 20a, the image area 67b is supplied from the ink supply device 20b, and the image area 67c is supplied.
To the image area 67d, and black, magenta, cyan, and yellow inks are respectively supplied to the image area 67d from the ink supply apparatus 20d. Then, this ink is transferred to the corresponding regions of the first and second blanket cylinders 13 and 14.

By repeating this operation, ink is supplied to the printing plate P on the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14.
This ink supply operation is repeatedly executed until the printing process is completed.

Printing plate P on the first and second plate cylinders 11 and 12
When the supply of ink to the first and second blanket cylinders 13 and 14 is completed, the printing paper S is supplied to the paper feed cylinder 16 as shown in FIG. The printing paper S is transferred from the gripper 84 of the paper feed cylinder 16 to the gripper 83 of the impression cylinder 15.

Then, the impression cylinder 15 further rotates, and the impression cylinder 1
If the leading edge of the printing paper S held on the outer periphery of the sheet 5 moves to a position facing the first blanket cylinder 13, the first blanket cylinder 13 is operated by the operation of the cylinder inserting mechanism shown in FIG.
Is brought into contact with the impression cylinder 15 and put in a cylinder insertion state. In this state, as shown in FIG. 12, the front end of the printing paper S is
It abuts the end of the area of the surface of the first blanket cylinder 13 that is used for printing black ink. Then, in the area of the surface of the first blanket cylinder 13 used for printing black ink, the first plate cylinder 1
The black ink is transferred from the image area 67a of the printing plate P held at 1. Therefore, by further rotating the first blanket cylinder 13 and the impression cylinder 15, the black ink is transferred to the printing paper S.

If the impression cylinder 15 further rotates and the leading edge of the printing paper S held on the outer periphery of the impression cylinder 15 moves to a position facing the second blanket cylinder 14, the operation of the cylinder inserting mechanism shown in FIG. To remove the second blanket cylinder 14 from the impression cylinder 1
It is in a state of putting the body in contact with 5. In this state,
As shown in FIG. 13, the front end of the printing paper S contacts the end of the area on the surface of the second blanket cylinder 14 on the side used for printing cyan ink. Then, the cyan ink is transferred from the image area 67c of the printing plate P held by the second plate cylinder 12 to the area of the surface of the second blanket cylinder 14 used for printing the cyan ink. There is. Therefore, the second blanket cylinder 1
By further rotating 4 and the impression cylinder 15, cyan ink is further transferred to the printing paper S on which black ink has already been transferred.

In this state, the impression cylinder 15 is moved to the first and second positions.
When the blanket cylinders 13 and 14 are continuously rotated, the printing paper S is completely wound around the outer circumference of the impression cylinder 15, as shown in FIG. Since the impression cylinder 15 has a diameter that is half that of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14, the impression cylinder 15 is wound around the outer circumference of the impression cylinder 15. In the second rotation, the printed printing paper S comes into contact with the area of the surface of the first blanket cylinder 13 on the side used for printing magenta ink.
The magenta ink is transferred from the image area 67b of the printing plate P held by the first plate cylinder 11 to the area of the surface of the first blanket cylinder 13 used for printing the magenta ink. There is. Therefore, the first
By further rotating the blanket cylinder 13 and the impression cylinder 15, the magenta ink is further transferred to the printing paper S on which the black and cyan inks have already been transferred.

When the impression cylinder 15 further rotates, the printing paper S comes into contact with the end of the area on the surface of the second blanket cylinder 14 on the side used for printing the yellow ink. And, in the area on the side used for printing the yellow ink on the surface of the second blanket cylinder 14,
The yellow ink is transferred from the image area 67d on the printing plate P held by the second plate cylinder 12. Therefore, when the second blanket cylinder 14 and the impression cylinder 15 are further rotated, the yellow ink is further transferred to the printing paper S on which the black, cyan, and magenta inks have already been transferred, and the four-color printing is performed. Is completed.

As shown in FIG. 15, the front end of the printing paper S on which the four colors have been printed is transferred from the impression cylinder 15 to the paper ejection cylinder 17. Further, after the printing paper S to be printed next is supplied to the paper feed cylinder 16, it is passed from the paper feed cylinder 16 to the impression cylinder 15.

Then, the printing paper S on which the four colors have been printed
As shown in FIG. 16, by driving the pair of chains 19, the paper is conveyed and discharged onto the paper discharge unit 28 together with the gripper 85 of the paper discharge cylinder 17.

As described above, in this printing apparatus, the impression cylinder 15 has a diameter half the diameter of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14. Therefore, the impression cylinder 15 rotates twice while the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 rotate once. The printing paper S held on the outer peripheral portion of the impression cylinder 15 while the impression cylinder 15 rotates twice.
The four colors of yellow, magenta, cyan, and black are printed on. Therefore, by supplying new printing paper S from the paper feed cylinder 16 every time the impression cylinder 15 makes two revolutions,
It is possible to continuously perform printing of four colors.

Next, the printing paper S is printed with yellow, magenta,
A printing operation in the case of performing monochrome printing using any one color ink of cyan and black will be described.

For example, when printing with only black ink in this printing apparatus, the first plate cylinder 1
Image areas 67a, 67 on the printing plate P held in 1
Form the same image on b. And the ink supply device 2
0a can supply black ink to both image areas 67a, 67b. Further, the other ink supply devices 20b, 20c, 20d are provided with the first and second plate cylinders 11, 1, respectively.
Separated from 2. Further, by the action of the cylinder insertion mechanism shown in FIG. 3, the first blanket cylinder 13 is brought into a cylinder insertion state in which the first blanket cylinder 13 is in contact with the impression cylinder 15, and the cylinder removal state is separated from the second blanket cylinder 14 and the impression cylinder 15. To do.

In this state, a new printing paper S is supplied from the paper feed cylinder 16 every time the impression cylinder 15 makes one revolution. As a result, every time the impression cylinder 15 makes one rotation, an image with black ink is transferred from the image area 67a or 67b on which the same image is formed to the printing paper S held on the outer periphery of the impression cylinder 15, It is possible to perform monochrome printing.

Next, the printing operation when two-color printing is performed on the printing paper S by using one of magenta or black ink and one of yellow or cyan ink will be described.

For example, in the case of printing with black and cyan ink in this printing apparatus, the image area 67a on the printing plate P held on the first plate cylinder 11,
The same image is formed on the image regions 67c and 67d of the printing plate P held by the second plate cylinder 12 and 67b.
Then, the ink supply device 20a is replaced by the image areas 67a, 67.
Black ink is supplied to both b, and the ink supply device 20c can supply cyan ink to both the image areas 67c and 67d. Further, the other ink supply devices 20b and 20d are provided with the first and second plate cylinders 11 and 12, respectively.
Keep it away from. Further, by the action of the cylinder insertion mechanism shown in FIG. 3, the first blanket cylinder 13 and the second blanket 14 are brought into a cylinder insertion state in which they come into contact with the impression cylinder 15.

In this state, a new printing paper S is supplied from the paper feed cylinder 16 every time the impression cylinder 15 makes one revolution. Thus, every time the impression cylinder 15 makes one rotation, the same image is formed on the printing sheet S held on the outer periphery of the impression cylinder 15 on the printing plate P mounted on the first plate cylinder 11. 67
After the image with the black ink from a or 67b is transferred, the image area 67c or 67 in which the same image is formed on the printing plate P mounted on the second plate cylinder 12 is formed.
The image of cyan ink from d is transferred, and two-color printing can be performed on the printing paper S.

Next, a case where printing is performed on both sides of the printing paper S with this printing device will be described. 17 to 2
FIG. 7 is an explanatory diagram showing a printing operation of double-sided two-color printing in which printing is performed on the front surface and the back surface of the printing paper S by using the two color inks of cyan and magenta by the printing device.

17 to 27, for convenience of description, the first plate cylinder 11 and the first blanket cylinder 1 are shown.
3, a region on the side used for printing with magenta ink on the surface of the printing paper S (hereinafter referred to as “M1 region”) is denoted by M1, and the first plate cylinder 11 and the first plate cylinder 11 are used. In the blanket cylinder 13 of No. 3, a region (hereinafter referred to as “M2 region”) on the side used for printing on the back surface of the printing paper S with magenta ink is denoted by M2. Further, of the second plate cylinder 12 and the second blanket cylinder 14, an area on the side used for printing with cyan ink on the surface of the printing paper S (hereinafter referred to as “C1”).
A region C) is designated by a reference numeral C1, and a rear face of the printing paper S is designated by a reference mark C2 for a region used for printing with cyan ink (hereinafter referred to as a "C2 region").

In the plate making process prior to the printing process, the first
The printing plate P mounted on the outer peripheral portion of the plate cylinder 11 of FIG.
As shown in (a), an image area 67a for printing on the front surface of the printing paper S with magenta ink and an image area 67b for printing on the back surface of the printing paper S with magenta ink are provided. The printing plate P that has been recorded and is mounted on the outer peripheral portion of the second plate cylinder 12 is for printing with cyan ink on the surface of the printing paper S, as shown in FIG. 2B. It is assumed that an image area 67c and an image area 67d for printing on the back surface of the printing paper S with cyan ink are recorded. Further, as in the case of the single-sided four-color printing described above, magenta ink is supplied to the ink supply device 20b, and cyan ink is supplied to the ink supply device 20c.

Further, in the image areas 67a and 67b, magenta ink is supplied from the ink supply device 20b.
Cyan ink is supplied to each of 7c and 67d from the ink supply device 20c.

First, by the action of the cylinder inserting mechanism shown in FIG. 3, the first and second blanket cylinders 13 and 14 are removed from the impression cylinder 1.
The state of being in a state of being removed from the body is arranged at a position separated from 5. In this state, the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 are rotated. At this time, the impression cylinder 15, the paper feed cylinder 16, the paper discharge cylinder 17, and the reversing cylinder 18 also rotate in synchronization.

First, each dampening water supply device 21 and each ink supply device 20 are brought into contact with only the corresponding image area of the printing plate P held on the first and second plate cylinders 11 and 12. . As a result, each of the image areas 67a, 67b, 67
The dampening water is supplied to c and 67d, and the image area 6
7a and 67b are supplied with magenta ink from the ink supply device 20b, and cyan ink is supplied from the ink supply device 20c to the image areas 67c and 67d. This ink is used for the first and second blanket cylinders 13,
Transferred to 14 corresponding regions.

By repeating this operation, ink is supplied to the printing plate P on the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14.
This ink supply operation is repeatedly executed until the printing process is completed.

When the supply of ink to the printing plates on the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 is completed, as shown in FIG.
Is supplied to the paper feed cylinder 16, and the leading end of the printing paper S is fed to the paper feed cylinder 1
The gripper 84 of No. 6 holds it. The printing paper S is transferred from the gripper 84 of the paper feed cylinder 16 to the gripper 83 of the impression cylinder 15.

Then, as shown in FIG. 18, the printing paper S is passed from the gripper 83 of the impression cylinder 15 to the gripper 85 of the paper ejection cylinder 17, and then is conveyed along the pair of chains 19. At this time, the first and second blanket cylinders 1
3, 3 and 14 are in a state of being removed from the impression cylinder 15 and are in a cylinder removal state, and printing is not performed on the surface of the first printing paper S. This first printing sheet S
After being printed only on the back surface of the paper, it will be discarded later as scrap paper. Further, in the state shown in FIG. 18, the second printing paper S is supplied to the paper feed cylinder 16.

As shown in FIG. 19, this printing paper is passed from the gripper 84 of the paper feed cylinder 16 to the gripper 83 of the impression cylinder 15.

Then, the impression cylinder 15 further rotates, and the impression cylinder 1
The leading edge of the second printing paper S held on the outer periphery of
If you move to the position facing the blanket cylinder 13 of
The first blanket cylinder 13 is brought into contact with the impression cylinder 15 by the operation of the cylinder insertion mechanism shown in FIG. In this state, as shown in FIG. 20, the front end portion of the surface of the second printing sheet S has the first blanket cylinder 1
It contacts the end of the M1 region in 3. And this M
The magenta ink is transferred from the image area 67a of the printing plate held by the first plate cylinder 11 to the first area. Therefore, the first blanket cylinder 13 and the impression cylinder 1
When 5 rotates further, magenta ink is transferred to the surface of the second printing paper S.

Further, in this state, the rear end of the first printing sheet S being conveyed along the pair of chains 19 is held by the gripper 86 of the reversing cylinder 18. Then, by the operation shown in FIGS. 6 and 7, the trailing edge of the first printing sheet S is moved from the gripper 86 of the reversing cylinder 18 to the gripper 8
7, and the first printing sheet S is inverted.

If the impression cylinder 15 further rotates and the leading edge of the printing paper S held on the outer periphery of the impression cylinder 15 moves to a position facing the second blanket cylinder 14, the operation of the cylinder inserting mechanism shown in FIG. To remove the second blanket cylinder 14 from the impression cylinder 1
It is in a state of putting the body in contact with 5. In this state,
As shown in FIG. 21, the leading edge of the second printing sheet S is
It contacts the end of the C1 region of the second blanket cylinder 14. Then, cyan ink is transferred to the C1 area from the image area 67c of the printing plate held by the second plate cylinder 12. Therefore, by further rotating the second blanket cylinder 14 and the impression cylinder 15,
The second printing sheet S on which magenta ink has already been transferred
Cyan ink is further transferred to the surface of the.

In this state, the impression cylinder 15 is moved to the first and second positions.
22, the second printing paper S is passed from the gripper 83 of the impression cylinder 15 to the gripper 85 of the paper ejection cylinder 17, and then a pair of chains. It is conveyed along 19. Further, in parallel with this, the first printing paper S is passed from the reversing cylinder 18 to the impression cylinder 15 via the paper feeding cylinder 16, and the back surface of the first printing paper S contacts the M2 region, Magenta ink is transferred to the back surface of the first printing sheet S. As described above, since the first printing sheet S is not printed on its surface, it is later discarded as waste paper.

The impression cylinder 15 is the first and second blanket cylinders 1.
When further rotating together with Nos. 3 and 14, as shown in FIG. 23, the back surface of the first printing sheet S comes into contact with the C2 area,
Cyan ink is transferred to the back surface of the first printing paper S. Further, in parallel with this, the third printing sheet S is supplied to the sheet feeding cylinder 16, and the leading end of this printing sheet S is fed to the sheet feeding cylinder 1.
The gripper 84 of No. 6 holds it.

When the impression cylinder 15 is further rotated, as shown in FIG. 24, the rear end of the second printing sheet S conveyed along the pair of chains 19 is moved to the gripper 86 of the reversing cylinder 18. Held by. Then, FIG. 6 and FIG.
By the operation shown in (1), the trailing edge of the second printing paper S is transferred from the gripper 86 to the gripper 87, and the second printing paper S is inverted. In parallel with this, cyan ink is transferred to the surface of the third printing paper S.

When the impression cylinder 15 continues to rotate, FIG.
As shown in FIG. 2, the back surface of the second printing paper S after being reversed is brought into contact with the M2 region of the first blanket cylinder 13,
Magenta ink is transferred to the back surface of the printing paper S of the eye. On the other hand, the leading edge of the first printing paper S is held by the gripper 85 of the paper ejection cylinder 17, the paper is conveyed along the pair of chains 19, and is ejected to the paper ejection unit 28.

The second printing paper S is delivered to the position on the impression cylinder 15 with the phase delayed by the same distance as the outer circumference of the first and second plate cylinders 11 and 12. Therefore, the phase of the second printing sheet S is deviated, and as described above, M on the back surface of the second printing sheet S and on the first blanket cylinder 13
The two areas abut. Therefore, the surface is first M1
It is possible to prevent the back surface of the printing paper S that has come into contact with the area from coming into contact with the M1 area again.

At this time, the printing paper S is divided into the first and second printing sheets.
Impression cylinder 1 delayed by the same distance as the outer circumference of the plate cylinders 11 and 12
5 will be conveyed to the position above. In other words, from another perspective, the printing paper S is returned to the impression cylinder 15 that has rotated two times after printing on the surface thereof, and the printing paper S is printed by the impression cylinder 15 at the third rotation counting from the printing on the surface. Is printed on the back side of. This is because the trailing edge of the printing paper S is on the discharge cylinder 17, the reversing cylinder 18, and the paper feed cylinder 16 at the same speed as the outer circumference of the impression cylinder 15 and the outer circumferences of the first and second plate cylinders 11 and 12. It is realized by carrying an extra amount by a distance obtained by subtracting the length of the printing paper S from the length of. In this printing device,
By setting the transport path of the print sheet S to be an integral multiple of the length of the print sheet S, the inverted print sheet S can be easily returned to an appropriate position.

By repeating the above operation for the second and subsequent printing sheets S supplied from the sheet feeding cylinder 16 every time the impression cylinder 15 makes two revolutions, double-sided printing is performed for a plurality of printing sheets S. To execute.

When the required printing is completed, as shown in FIG. 26, at the time when the first blanket cylinder 13 has finished printing on the second to last printing sheet S, the cylinder insertion mechanism shown in FIG. By the action, the first blanket cylinder 13
Is separated from the impression cylinder 15 and is in a cylinder removal state.

Then, as shown in FIG. 27, the second blanket cylinder 14 for the second to last printing sheet S is printed.
When the printing by (3) is completed, the second blanket cylinder 14 is separated from the impression cylinder 15 by the action of the cylinder insertion mechanism shown in FIG.

By setting the first and second blanket cylinders 13 and 14 in the unrolled state as described above, the back surface of the last printing sheet S is not printed. For this reason, the last print sheet S is discarded later as waste paper.

As is apparent from the above description of the printing process, in this printing apparatus, in order to selectively execute the printing in the monochrome printing mode, the multicolor printing mode, or the simplex printing mode or the duplex printing mode. , The gripper 83 in the impression cylinder 15, and the gripper 8 in the paper feed cylinder 16
4. It is necessary to control the opening / closing operations of the gripper 85 of the paper discharge cylinder 17 and the grippers 86 and 87 of the reversing cylinder so as to be in a mode corresponding to the print mode.

That is, 4 is printed on one side of the printing paper S described above.
In the color printing mode, the gripper 84 of the paper feed cylinder 16 receives the printing paper S from the paper feed unit 27 every two rotations of the impression cylinder 15, and the gripper 83 of the impression cylinder 15 receives the print paper S every two rotations. You need to give this printing paper. Further, the gripper 83 of the impression cylinder 15 needs to pass the printing paper S received every two rotations from the gripper 84 of the paper feeding cylinder 16 to the gripper 85 of the discharge cylinder 17 every two rotations.

In addition, 1, 2 may be provided on one side of the above-mentioned printing paper S.
In the color printing mode, the gripper 84 of the paper feed cylinder 16 receives the print sheet S from the paper feed unit 27 each time the impression cylinder 15 makes one rotation, and the gripper 83 of the impression cylinder 15 makes one rotation. You need to give this printing paper to. Further, the gripper 83 of the impression cylinder 15 needs to pass the printing paper S received every one rotation from the gripper 84 of the paper feeding cylinder 16 to the gripper 85 of the discharge cylinder 17 every one rotation.

Further, in the mode for executing printing on both sides of the printing paper S described above, the gripper 84 of the paper feed cylinder 16 is used.
Must switch the operation of receiving the print sheet S from the paper feed unit 27 and the operation of receiving the print sheet S from the gripper 87 of the reversing cylinder 18 for each rotation. Further, the gripper 83 of the impression cylinder 15 needs to pass the printing paper S received every one rotation from the gripper 84 of the paper feeding cylinder 16 to the gripper 85 of the discharge cylinder 17 every one rotation. Also, the output cylinder 1
The gripper 85 of No. 7 needs to switch the operation of passing the printing paper S received from the gripper 83 of the impression cylinder 15 to the gripper 86 of the reversing cylinder 18 and the operation of discharging it to the paper discharge unit 28 for each rotation. Further, the gripper 86 of the reversing cylinder 18,
It is necessary for 87 to perform an operation of reversing the printing paper S received from the gripper 85 of the paper discharge cylinder 17 and then passing it to the gripper 84 of the paper feed cylinder 16.

Hereinafter, the gripper 8 in this impression cylinder 15
3, the gripper 84 in the paper feed cylinder 16, the gripper 85 in the paper discharge cylinder 17, and the gripper 8 in the reversing cylinder 18.
The configuration of the cam mechanism for controlling the opening / closing operations of Nos. 6 and 87 will be described. FIG. 28 shows each gripper 83, 84, 8
FIG. 29 is a schematic side view showing a schematic arrangement of a plurality of fixed cams and movable cams in a cam mechanism for opening and closing 5, 86, 87, and FIG. 29 is a schematic side view showing a moving mechanism for moving the movable cams. is there.

The cam mechanism in this printing apparatus is a first cam mechanism 100 for switching between a continuous paper feeding mode for executing single-color or two-color printing and an intermittent paper feeding mode for executing four-color printing. And a second cam mechanism 200 that switches between a single-sided printing mode for performing single-sided printing and a double-sided printing mode for performing double-sided printing.

Here, in the continuous paper feed mode, the printing paper S is transferred from the paper feed cylinder 16 to the impression cylinder 15 every one rotation of the impression cylinder 15 when performing single-color or two-color printing regardless of single-sided or double-sided printing.
Is a mode for feeding printing paper from the impression cylinder 15 to the discharge cylinder 17 every one rotation of the impression cylinder 15.
In the intermittent paper feed mode, when performing single-sided four-color (or three-color) printing, the printing cylinder S is fed from the paper feed cylinder 16 to the impression cylinder 15 every two rotations of the impression cylinder 15, and the pressure is applied. 2 of the torso 15
In this mode, the printing paper is delivered from the impression cylinder 15 to the paper ejection cylinder 17 every rotation.

The first cam mechanism 100 includes the impression cylinder 1
5, the moving cams 584, 585, and 586 provided on the sides of the paper feed cylinder 16, the paper discharge cylinder 17, and the reversing cylinder 18, respectively, are used to switch between the continuous paper feed mode and the intermittent paper feed mode. ing. The second cam mechanism 200 includes moving cams 576 and 578 arranged on the side of the sheet feeding cylinder 16 and moving cams 43 and 45 arranged on the side of the reversing cylinder 18.
48 is used to switch between the single-sided printing mode and the double-sided printing mode.

32 and 33 show the first cam mechanism 1.
It is explanatory drawing which shows the moving cams 584, 585, 586 connected to 00 together with the fixed cams 587, 588, 589. In these figures, each moving cam 584,
585 and 586 are shown by a dashed line, and each fixed cam 587,
588 and 589 are indicated by solid lines.

As shown in these figures and FIG. 28, a fixed cam 587 composed of cams 573 and 574 is fixed to the side of the impression cylinder 15. A moving cam 584 is arranged on the side of the fixed cam 587 so as to be coaxial with the fixed cam 587. This moving cam 584 has a first
When the cam mechanism 100 is driven, the cam mechanism 100 swings between a position protruding outside the fixed cam 587 shown in FIG. 32 and a position hidden by the fixed cam 587 shown in FIG. And impression cylinder 1
The gripper 83 in No. 5 is configured to move to a position where the leading edge of the printing paper S is pinched by the cam follower 88 connected thereto contacting the fixed cam 587 or the moving cam 584.

A fixed cam 588 is arranged on the side of the paper feed cylinder 16. A moving cam 585 is arranged on the side of the fixed cam 588 so as to be coaxial with the fixed cam 588. This moving cam 585 is the first cam mechanism 10
By driving 0, it swings between a position protruding outside the fixed cam 588 shown in FIG. 32 and a position hidden by the fixed cam 588 shown in FIG. Then, the gripper 84 of the paper feed cylinder 16 is moved to a position where the leading end of the printing paper S is opened by the cam follower 89 connected thereto contacting the fixed cam 588 or the moving cam 585. . It should be noted that a moving cam 57 connected to the second cam mechanism 200 is provided on the side of the paper feed cylinder 16 as described later.
6, 578 are also provided.

A fixed cam 589 is provided on the side of the paper discharge cylinder 17. A moving cam 586 is arranged on the side of the fixed cam 589 so as to be coaxial with the fixed cam 589. The moving cam 586 is used for the first cam mechanism 10
By driving 0, it swings between a position protruding outside the fixed cam 589 shown in FIG. 32 and a position hidden by the fixed cam 589 shown in FIG. Then, the gripper 85 attached to the chain 19 wound around both ends of the paper discharge cylinder 17 is
The cam follower 90 connected thereto has a fixed cam 589.
Alternatively, by contacting the moving cam 586, the printing paper S is moved to a position where the leading end of the printing paper S is opened.

The plurality of grippers 85 attached to the chain 19 wound around the both ends of the paper discharge cylinder 17 move together with the chain 19 as the paper discharge cylinder 17 rotates, and the cam followers 90 thereof move. By contacting a hitting member (not shown) disposed above the paper discharge unit 28, the paper discharge unit 28
The upper end of the printing paper S is open above the above. When performing double-sided printing in this printing device, a plurality of grippers 8 attached to the chain 19 are used.
5 is a hit member 4 whose cam follower 90 will be described later.
By contacting the sheet 1, the front end of the print sheet S is opened in order to reverse the print sheet S.

34 and 35 show the second cam mechanism 2
Moving cam 576 on the paper feed cylinder 16 connected to
It is explanatory drawing which shows 578 with the fixed cam 588.

On the side of the fixed cam 588 of the paper feed cylinder 16 and the moving cam 585 of the paper feed cylinder 16 connected to the above-described first cam mechanism 100, there is a moving cam 576 connected to the second cam mechanism 200. Fixed cam 588 and moving cam 58
5 is arranged coaxially. And this moving cam 5
When the cam follower 577 is pressed to the side of 76 by the moving cam 576, the position where the cam follower 577 projects outside the fixed cam 588 shown in FIG. 34 around the shaft 579 and the fixed cam 588 shown in FIG. A moving cam 578 that swings between the hidden position and the hidden position is provided.

FIG. 36 shows the gripper 8 of the reversing cylinder 18.
FIG. 8 is a schematic view showing opening / closing mechanisms of 6, 87.

The above-mentioned impression cylinder 15, paper feed cylinder 16, and paper ejection cylinder 1
In FIG. 7, the grippers 83, 84, 85 are opened and closed by pressing the cam followers 88, 89, 90 directly connected to the grippers 83, 84, 85. In the above, the pair of grippers 86 and 87 is configured to be opened and closed via the gear 94.

That is, the gear 95 attached to the pair of grippers 86 and 87 meshes with the pair gear 94 attached to the reversing cylinder 18 so as to be rotatable. Further, the pair of gears 94 includes a pair of rack members 9 that can swing around a shaft 96.
It meshes with the second gear portion 93. Then, the pair of cam followers 91 are connected to the pair of rack members 92 via a connecting member 97. Therefore, the grippers 86 and 87 of the reversing cylinder 18 are fixed by the cam followers 91, which will be described later.
It is configured to move to the position where the front end of the printing paper S is opened by contacting with.

FIGS. 37 and 38 are explanatory views showing the positional relationship between the fixed cams 44, 46, 47 and the movable cams 43, 45, 48 arranged laterally of the reversing cylinder 18. 39 is a side view of the moving cam 43, FIG. 40 is a side view of the fixed cam 44, FIG. 41 is a side view of the moving cam 45, and FIG.
Is a side view of the fixed cam 46, FIG. 43 is a side view of the fixed cam 47, and FIG. 44 is a side view of the moving cam 48.

On the side of the reversing cylinder 18, three fixed cams 4 are provided.
4, 46 and 47 are fixed. A moving cam 48 that rotates around an axis 50 of the reversing cylinder 18 is provided on the side surface of the reversing cylinder 18. On the left side of the movable cam 48, a movable cam 43 rotatable around a shaft 52 formed on the fixed cam 44 is in a state in which a cam follower 51 attached thereto is brought into contact with the movable cam 48. It is installed in. Further, on the right side of the moving cam 48, a moving cam 45 rotatable around a shaft 53 formed on the fixed cam 46 is in a state in which a cam follower 54 attached thereto is brought into contact with the moving cam 48. It is installed in.

Therefore, when the moving cam 48 rotates, the moving cam 43 is pressed by the cam follower 51 to rotate about the shaft 52, and the moving cam 45 moves. It is rotated about the shaft 53 by being pressed through. Therefore, by rotating the moving cam 48 by driving a second cam mechanism 200 described later, the moving cam 43 shown in FIG. 37 projects from the fixed cam 47 and the moving cam 45 is hidden by the fixed cam 46. Then, it is possible to switch between the state in which the movable cam 43 shown in FIG. 38 is hidden by the fixed cam 47 and the movable cam 45 projects from the fixed cam 46.

Next, the above-mentioned moving cams 43, 45, 4
A moving mechanism for moving 8, 576, 578, 584, 585, 586 will be described with reference to FIGS. 29 to 31.

Among these drawings, FIG. 29 shows a state in which both the first link mechanism 100 and the second link mechanism 200 are fixed for single-sided single-color or single-sided two-color printing. Also, FIG. 30 shows four colors (or three colors) on one side.
In order to perform (color) printing, the first link mechanism 100 is movable and the second link mechanism 200 is fixed. Further, FIG. 31 shows a state in which the first link mechanism 100 is fixed and the second link mechanism 200 is movable in order to perform double-sided printing.

As shown in these figures, the first link mechanism 100 has a main link 592 which is swingable about a main link shaft 593. The main link 592 has a cam follower 594 that can come into contact with a cam 591 arranged coaxially with the second blanket cylinder 14. Further, this main link 592 is connected to the cam follower 5 by the spring 596.
94 is urged in a direction in which it abuts on the cam 591. Therefore, in the main link 592, in the non-fixed state shown in FIG. 30, the cam 591 has the second blanket cylinder 14
By rotating in synchronization with, the main link shaft 593 swings around the center.

A moving cam 58 arranged on the side of the impression cylinder 15.
4 is connected to the main link 592 via a link 601. Further, the moving cam 585 arranged on the side of the paper feed cylinder 16 is connected to the moving cam 584 via a link 602 and a connecting plate 604. Further, the moving cam 586 disposed on the side of the paper discharge cylinder 17 is connected to the main link 592 via a link 603.

In such a structure, the main link 592
The cam follower 594 of the cam 59 as shown in FIG.
In the state where the moving cam 58 is in contact with the valley portion of No. 1,
4, 585 and 586 are in the state shown in FIG.
In this state, the second blanket cylinder 14 rotates together with the first blanket cylinder 13, the plate cylinder 15, etc., and the cam follower 594 of the main link 592 is pressed by the cam 591, and the main link 592 is centered on the main link shaft 593. Figure 1
It rotates in the clockwise direction indicated by 3.

With the rotation of the main link 592, the movable cam 5 connected to the main link 592 via the link 601.
Reference numeral 84 denotes the shaft center of the impression cylinder 15 as a center, and FIGS.
It rotates in the counterclockwise direction shown in. Also, this moving cam 58
4, the moving cam 585 connected to the moving cam 584 via the link 602 and the connecting plate 604 is rotated clockwise about the shaft center of the sheet feeding cylinder 16 as shown in FIGS. 29 to 31. To do. Further, with the rotation of the main link 592, the moving cam 586 connected to the main link 592 via the link 603 moves in the counterclockwise direction shown in FIGS. 29 to 31 about the axis of the discharge cylinder 17. Rotate.

Therefore, in the state where the cam follower 594 of the main link 592 is in contact with the mountain portion of the cam 591,
The moving cams 584, 585, 586 are in the state shown in FIG. Therefore, when the first link mechanism 100 is in a movable state as shown in FIG. 30, the moving cams 584, 585, 586 are not moved by the cam 591.
Makes one revolution with the second blanket cylinder 14, that is, while the impression cylinder 15 makes two revolutions, reciprocates between the position shown in FIG. 32 and the position shown in FIG.

Below the main link 592, the solenoid 5
A stopper 597 that is swingable around the shaft 605 by driving 98 is provided. The stopper 597 is for inhibiting the swinging of the main link 592 described above by engaging with the pin 595 provided upright on the main link 592.

The main link 59 is made by this stopper 597.
In order to prohibit the swinging of No. 2, the stopper 597 is rotated counterclockwise about the shaft 605 by driving the solenoid 598. In this state, the main link 592 is moved by the action of the cam 591, and as shown in FIGS. 29 and 31, the tip portion of the stopper 597 and the main link 592.
To engage with the pin 595 which is erected. In this state, regardless of the rotational angle position of the cam 591, the main link 592 is fixed at the position shown in FIGS. 29 and 31, and the moving cams 584, 585, 586 are
The cam follower 594 of the main link 592 is fixed in the same state as the state in which the cam follower 594 of the main link 592 is in contact with the mountain portion of the cam 591.

On the other hand, the second link mechanism 200 is provided with a main link 612 swingable around the main link shaft 611. This main link 612 is used for the first blanket cylinder 13
And a cam follower 614 that can come into contact with a cam 613 arranged coaxially. Also, this main link 612 is
The spring 615 causes the cam follower 614 to move to the cam 613.
Is urged in a direction to abut. Therefore, in the unfixed state shown in FIG. 31, the main link 612 swings around the main link shaft 611 as the cam 613 rotates in synchronization with the first blanket cylinder 13. ing.

A moving cam 5 arranged on the side of the paper feed cylinder 16.
76 is connected to the main link 612 via a link 616. In addition, the moving cam 48 disposed on the side of the reversing cylinder 18 has links 617, 618, 61 that connect to each other.
It is connected to the main link 612 through a link mechanism composed of 9 and a connecting plate 621.

In such a configuration, the main link 612
As shown in FIG. 31, the cam follower 614 of the cam 61
In the state where the moving cams 576 and 578 on the paper feed cylinder 16 are in the state shown in FIG.
Further, the moving cams 43, 45, 48 in the reversing cylinder 18 are in the state shown in FIG. Therefore, the cam follower 89 of the gripper 84 on the paper feed cylinder 16 is moved by the moving cam 578.
The gripper 84 is opened by being pressed by the reversing cylinder 1
The print sheet S is received from the gripper 87 of No. 8.

In this state, the first blanket cylinder 1
3 rotates together with the second blanket cylinder 14 and the plate cylinder 15, and the cam follower 614 of the main link 612 rotates the cam 61.
3, the main link 612 is pushed by the main link shaft 611.
29 to 31 in the counterclockwise direction.

With the rotation of the main link 612, the link 616 and the link mechanism composed of the links 617, 618, and 619 and the connecting plate 621 move, so that the moving cams 576 and 578 on the sheet feeding cylinder 16 are moved to the positions shown in FIG. The state shown in FIG.
3, 45 and 48 are in the state shown in FIG. In this state, the gripper 86 of the reversing cylinder 18 receives the printing paper S from the gripper 85 of the paper ejecting cylinder 17 in the reversed state.

As shown in FIG. 31, the second link mechanism 20
When 0 is movable, while the cam 613 makes one rotation with the first blanket cylinder 13, that is, while the impression cylinder 15 makes two rotations, the paper feed cylinder 16
The moving cams 576, 578 in FIG. 34 reciprocate between the position shown in FIG. 34 and the position shown in FIG. 35, and the moving cams 43, 45, 48 in the reversing cylinder 18 move between the position shown in FIG. 37 and the position shown in FIG. Transfer back and forth between.

Below the main link 612, the solenoid 6 is
A stopper 624 that is swingable around a shaft 623 when driven by 22 is provided. The stopper 624 is for inhibiting the swing of the main link 612 described above by engaging with the pin 625 provided upright on the main link 612.

This stopper 624 allows the main link 61
In order to prohibit the swing of No. 2, the solenoid 622 is driven to rotate the stopper 624 clockwise about the shaft 623. In this state, connect the main link 612 to the cam 6
It is moved by the action of 13, and as shown in FIGS. 29 and 30, the tip end portion of the stopper 624 and the pin 625 erected on the main link 612 are engaged. In this state, the main link 612 is fixed at the position shown in FIGS. 29 and 30, regardless of the rotational angular position of the cam 613, and the moving cams 576, 578, 43, 45,
48 is fixed in the same state as the cam follower 614 of the main link 612 is in contact with the mountain portion of the cam 613.

Below the above-mentioned first link mechanism 100, there is provided a releasing mechanism 300 for releasing the gripper 85 which moves along the chain 19 while holding the leading end of the printing paper S during double-sided printing. It is arranged.

That is, when performing double-sided printing by this printing device, as shown in FIGS. 6 and 7, the trailing edge of the printing paper S, the leading edge of which is held by the gripper 85 of the paper discharge cylinder 17, is reversed. Gripper 8 on torso 18
6, it is necessary to release the holding of the leading edge of the printing paper S by the gripper 85 of the paper discharge cylinder 17 while holding the paper. Therefore, in the release mechanism 300, the contact member 4
1 is reciprocated between a position where it contacts the cam follower 90 of the gripper 85 that moves along the chain 19 and a position where it does not contact the cam follower of the gripper 85, every time the impression cylinder 15 makes two revolutions. When the rear end of the print sheet S is held by the gripper 86 of the reversing cylinder 18, the gripper 85 of the discharge cylinder 17 releases the front end of the print sheet S.

This release mechanism 300 is shown in FIG. 45 and FIG.
6, a link 629 swingable about a shaft 628, a spring 630 for rotating the link 629 counterclockwise as shown in FIGS. 45 and 46 about the shaft 628, and a tip of the link 629. And a link 631 connected to the shaft 631 via a shaft 634. Also, link 631
Are connected to the pressing plate 633 via a pair of eccentric mechanisms 632. This pressing plate 633 has a link 629 shown in FIG.
By rotating clockwise from the position shown in FIG. 5 to the position shown in FIG. 46, the structure shown in FIG. 45 rises from the position shown in FIG.

Below the pressing plate 633, a screw 636 which rotates a distance for driving the motor 635 is installed in parallel with the pressing plate 633. This screw 636 has a nut member 63.
7 is screwed in a state of being reciprocally movable in the left and right directions shown in FIGS. 45 and 46 by the rotation of the screw 636. The hitting member 41 described above is the nut member 637.
It is rotatably arranged around a shaft 638 formed in the center.

As shown in FIG. 45, the hitting member 41 is in a state where the upper end surface thereof is pressed by the pressing plate 633 when the pressing plate 633 is lowered. In this state, the lower end portion of the hitting member 41 is arranged at a position where it abuts on the cam follower 90 of the gripper 85 moving along the chain 19. Therefore, in FIG.
When the gripper 85 moving along the chain 19 passes below the contact member 41 as indicated by the two-dot chain line in FIG. It will be in the state of opening.

On the other hand, the contact member 41 is rotated from the position shown in FIG. 45 with its upper end surface opened when the pressing plate 633 is raised as shown in FIG. In this state, the lower end of the contact member 41 is the chain 1
Cam follower 90 of gripper 85 moving along 9
Will be placed in a position where it does not abut. For this reason,
As shown by the chain double-dashed line in FIG. 46, even when the gripper 85 moving along the chain 19 passes below the hitting member 41, the gripper 85 holds the printing paper S and holds the printing paper S. Move in 28 directions.

As shown in FIGS. 29 to 31, the main link 612 of the second link mechanism 200 includes a link 626 fixed thereto and a link 627 connected to the lower end of the link 626. Then, as shown in FIG. 31, when the cam follower 614 of the main link 612 is in contact with the trough of the cam 613, the link 627 is
The leading end of the button presses the lower end of the link 629 in the release mechanism 300.

Here, as described above, in the state where the second link mechanism 200 is movable for performing double-sided printing, while the cam 613 makes one rotation with the first blanket cylinder 13, that is, the impression cylinder. While 15 turns twice,
The main link 612 in the second link mechanism 200 swings once. Therefore, this main link 612 and link 62
The link 627 connected via 6 also reciprocates once while the impression cylinder 15 makes two revolutions, so that the contact member 41 is
While the 5 rotates twice, it reciprocates between the position shown in FIG. 45 and the position shown in FIG.

More specifically, the discharge cylinder 17 to the discharge unit 2
When the printing paper S is discharged onto the sheet 8, the gripper 85 holding the front end of the printing paper S is passed as it is, as shown in FIG. On the other hand, the output cylinder 17 to the reversing cylinder 18
When the printing paper S is delivered to the paper, the gripper 85 holding the printing paper S is opened by the action of the contact member 41, as shown in FIG.

A solenoid 64 is provided on the side of the link 629.
A stopper 643 that is swingable around the shaft 642 by the driving of No. 1 is provided. The stopper 643 is for inhibiting the swing of the link 629 described above by engaging with the pin 644 provided upright on the link 629.

When double-sided printing is not performed, the process shown in FIG.
9 and FIG. 30, the stopper 643 prohibits the link 629 from swinging. As a result, FIG.
As in the case shown in FIG. 6, the link 629 is shown in FIGS.
The gripper 85, which holds the leading edge of the printing paper S, always passes below the contact member 41 as it is because the gripper 85 holds the leading edge of the printing paper S.

In the first and second link mechanisms 100 and 200 and the release mechanism 300 having the above-described configurations, when single-sided single color or single-sided two-color printing is performed, as shown in FIG. Second link mechanism 10
0, 200 and the release mechanism 300 are all fixed. As a result, the printing paper S is supplied from the paper feed cylinder 16 to the impression cylinder 15 for each rotation of the impression cylinder 15, and then single-color or two-color printing is executed while the impression cylinder 15 makes one rotation. 1
Every 5 rotations of the sheet 5, the sheet is transferred from the impression cylinder 15 to the paper discharge cylinder 17 and discharged to the paper discharge unit 28.

In the case of performing one-sided four-color (or three-color) printing, as shown in FIG. 30, the first link mechanism 100 is made movable, and the second link mechanism 200 and the release mechanism 300 are fixed. To do. As a result, the printing paper S
Is supplied from the paper feed cylinder 16 to the impression cylinder 15 every two rotations of the impression cylinder 15, and then four colors (or 3 colors) are supplied during two rotations of the impression cylinder 15.
(Color) printing is performed, and is transferred from the impression cylinder 15 to the paper ejection cylinder 17 and discharged to the paper ejection unit 28 every two rotations of the impression cylinder 15.

Furthermore, when performing double-sided printing,
As shown in FIG. 31, the first link mechanism 100 is fixed, and the second link mechanism 200 and the release mechanism 300 are movable. As a result, the printing paper S is supplied from the paper feed cylinder 16 to the impression cylinder 15 every two rotations of the impression cylinder 15, and then the surface of the printing paper S is printed while the impression cylinder 15 makes one rotation. From the paper output cylinder 17 and the reversing cylinder 18 to the paper feed cylinder 16
While being supplied to the impression cylinder 15, the impression cylinder 15 prints the back surface of the impression cylinder 15 again, and then the impression cylinder 1 is rotated every two revolutions of the impression cylinder 15.
The sheet 5 is transferred to the sheet discharge cylinder 17 and discharged to the sheet discharge unit 28.

Next, the transfer operation of the printing paper S in the printing apparatus configured as described above will be described.

First, the printing paper S is printed with yellow, magenta,
The transfer operation of the printing paper S when four-color printing is performed using four color inks of cyan and black will be described. In this case, printing is executed by the operation shown in FIGS.

47 to 56 are explanatory views showing the transfer operation of the printing paper S in such a case. 47 to 56, each of the links 592, 601, 6 of the first link mechanism 100 shown in FIGS. 29 to 31.
02, 603 and the connecting plate 604 are shown in a simplified manner. Further, in this case, the second link mechanism 2
00 and the release mechanism 300 are fixed, the second link mechanism 200 and the release mechanism 300 are not shown. Further, since the reversing cylinder 18 is not used, the grippers 86 and 87 of the reversing cylinder 18 are not shown.

When four-color printing is performed on the printing paper S by using four color inks of yellow, magenta, cyan and black, as described above, the first link mechanism 1 is used.
00 is movable and the second link mechanism 200 and the release mechanism 300 are fixed, so that it is necessary to supply the printing paper S from the paper feed cylinder 16 to the impression cylinder 15 every time the impression cylinder 15 makes two revolutions. .

In this case, the main link 592 is made swingable by fixing the stopper 597 to the position shown in FIG. 30 by driving the solenoid 598.

Then, the printing paper S is taken out from the paper feed section 27 by the suction plate 74 shown in FIG. 1 and, as shown in FIG. 47, its leading end is conveyed toward the gripper 84 of the paper feed cylinder 16. At this time, the cam follower 89 of the gripper 84
Is in contact with the mountain portion of the fixed cam 588, and the gripper 84
Is open.

In this state, the paper feed cylinder 16 rotates,
When the cam follower 89 of the gripper 84 passes the mountain portion of the fixed cam 588, the gripper 84 is closed as shown in FIG.

By further rotating the paper feed cylinder 16,
As shown in FIG. 49, when the gripper 84 of the paper feed cylinder 16 and the gripper 83 of the impression cylinder 15 move to the opposite position, the cam follower 89 of the gripper 84 starts the opening operation by the action of the fixed cam 588. Further, the cam follower 88 of the gripper 83 comes into contact with the mountain portion of the fixed cam 587 to complete the closing operation. As a result, the front end of the printing paper S is transferred from the gripper 84 to the gripper 83.

By further rotating the impression cylinder 15 in this state, the first printing on the printing paper S held on the outer peripheral portion of the impression cylinder 15 is started. In this state, FIG.
As shown in, the cam follower 88 of the gripper 83 is in contact with the mountain portion of the fixed cam 587, and the nipping state of the leading end portion of the printing paper S is maintained.

In FIG. 51, when the impression cylinder 15 further rotates in this state, the gripper 83 of the impression cylinder 15 and the discharge cylinder 1 are discharged.
7 shows a state in which the gripper 85 of No. 7 has moved to a position facing the gripper 85. In the state shown in this figure, the main link 59
Since the second cam follower 594 is in contact with the valley portion of the cam 591, the moving cams 584, 585, 586 and the fixed cams 587, 588, 589 have the positional relationship shown in FIG. Therefore, the cam follower 88 of the gripper 83 of the impression cylinder 15 contacts the moving cam 584, and the closed state of the gripper 83 is maintained. Further, the cam follower 90 in the gripper 85 of the paper discharge cylinder 17 moves the moving cam 5
The gripper 85 is kept in contact with the gripper 86 and the open state of the gripper 85 is maintained. Therefore, the printing paper S is not transferred from the gripper 83 to the gripper 85.

FIG. 52 shows that the gripper 83 of the impression cylinder 15 and the paper feed cylinder 1 are rotated by further rotation of the impression cylinder 15 in this state.
6 shows a state in which the gripper 84 of No. 6 has moved to a position facing the gripper 84. Even in the state shown in this figure, the main link 59
Since the second cam follower 594 is in contact with the valley portion of the cam 591, the moving cams 584, 585, 586 and the fixed cams 587, 588, 589 have the positional relationship shown in FIG. Therefore, the cam follower 88 of the gripper 83 of the impression cylinder 15 contacts the moving cam 584, and the closed state of the gripper 83 is maintained. Further, the cam follower 89 of the gripper 84 of the paper feed cylinder 16 is in contact with the moving cam 585 in advance, and the gripper 84 is kept open. For this reason, even when the gripper 83 and the gripper 84 come to the position where they face each other, the printing paper S is not delivered.

By further rotating the impression cylinder 15 in this state, the second printing on the printing paper S held on the outer peripheral portion of the impression cylinder 15 is started. In this state,
As shown in FIG. 3, the cam follower 88 of the gripper 83 is in contact with the mountain portion of the fixed cam 587, and the nipping state of the leading end portion of the printing paper S is maintained. Further, in this state, the second printing paper S is supplied to the paper feed cylinder 16. At this time, the cam follower 89 of the gripper 84 on the paper feed cylinder 16 is in contact with the mountain portion of the fixed cam 588, and the gripper 84 is open.

In FIG. 54, when the impression cylinder 15 further rotates in this state, the gripper 83 of the impression cylinder 15 and the discharge cylinder 1 are discharged.
7 shows a state in which the gripper 85 of No. 7 has moved to a position facing the gripper 85. In the state shown in this figure, unlike the state shown in FIG. 51, the cam follower 59 of the main link 592 is different.
Since 4 is in contact with the mountain portion of the cam 591, the moving cams 584, 585, 586 and the fixed cams 587, 58
8, 589 are in the arrangement relationship shown in FIG. Therefore, the cam follower 88 in the gripper 83 of the impression cylinder 15 comes into contact with the valley portion of the fixed cam 587, and the gripper 8
The opening operation of 3 is started. Further, the cam follower 90 of the gripper 85 of the paper discharge cylinder 17 comes into contact with the trough of the fixed cam 589, whereby the closing operation of the gripper 85 is completed. Therefore, the print sheet S is transferred from the gripper 83 to the gripper 85.

In this state, when the sheet discharge cylinder 17 further rotates, the leading edge of the printing sheet S is held by the gripper 85 and conveyed, as shown in FIG. Also,
Similar to the case shown in FIG. 49, the leading end of the second printing sheet S is transferred from the gripper 84 to the gripper 83.

Further, as the paper discharge cylinder 17 further rotates, the printing paper S is transferred to the chain 1 as shown in FIG.
9 is conveyed to above the paper discharge unit 28. Then, the cam follower 90 of the gripper 85 contacts an abutting member (not shown) above the paper discharge unit 28, whereby the gripper 85 is opened, and the print sheet S is discharged from the paper discharge unit 2.
8 is discharged.

Next, the printing paper S is printed with yellow, magenta,
When monochrome printing is performed using any one color ink of cyan and black, or on the printing paper S, any one color ink of magenta or black and any one color ink of yellow or cyan The transfer operation of the printing paper S when two-color printing is performed by using will be described.

57 to 59 are explanatory views showing the delivery operation of the printing paper S in such a case. 57 to 59, the links 592, 601, 6 of the first link mechanism 100 shown in FIGS. 29 to 31 are also shown.
02, 603 and the connecting plate 604 are shown in a simplified manner. Also in this case, the second link mechanism 2
00 and the release mechanism 300 are not shown. Further, since the reversing cylinder 18 is not used, the grippers 86 and 87 of the reversing cylinder 18 are not shown.

When such single-sided single-color or single-sided two-color printing is performed on the printing paper S, as described above, the first and second link mechanisms 100 and 200 and the release mechanism 3 are used.
All 00 are fixed. As a result, the printing paper S is supplied from the paper feed cylinder 16 to the impression cylinder 15 for each rotation of the impression cylinder 15, and then the printing paper S is supplied with a single color or two
Color printing is performed, and each time the impression cylinder 15 rotates, it is transferred from the impression cylinder 15 to the paper ejection cylinder 17 and ejected to the paper ejection unit 28.

In this case, the stopper 597 is fixed at the position shown in FIG. 28 by driving the solenoid 598, and the tip of the stopper 597 is engaged with the pin 595 erected on the main link 592. The main link 592 is fixed in the same state where the cam follower 594 is in contact with the mountain portion of the cam 591. Further, by driving the solenoid 622, the stopper 624 is fixed at the position shown in FIG. 28, and the leading end portion of the stopper 624 is engaged with the pin 625 erected on the main link 612, so that the main link 612 is moved to its cam. The follower 614 is fixed in the same state as that in which the follower 614 is in contact with the mountain portion of the cam 613.

Then, the printing paper S is taken out from the paper feed section 27 by the suction board 74 shown in FIG. 1, and the leading end thereof is conveyed toward the gripper 84 of the paper feed cylinder 16 as in the case shown in FIG. At this time, the cam follower 89 of the gripper 84 is in contact with the mountain portion of the fixed cam 588, and the gripper 84 is open.

In this state, the paper feed cylinder 16 rotates,
When the cam follower 89 of the gripper 84 passes through the mountain portion of the fixed cam 588, the gripper 84 is closed and the leading end of the printing paper S is pinched, as in the case shown in FIG.

When the paper feed cylinder 16 is further rotated,
Similarly to the case shown in FIG. 49, the gripper 8 of the paper feed cylinder 165 is
4 moves to a position where the gripper 83 of the impression cylinder 15 faces each other, the cam follower 89 of the gripper 84 moves to the fixed cam 5
The action of 88 starts the opening operation. Further, the cam follower 88 of the gripper 83 comes into contact with the mountain portion of the fixed cam 587 to complete the closing operation. As a result, the front end of the printing paper S is transferred from the gripper 84 to the gripper 83.

By further rotating the impression cylinder 15 in this state, printing on the printing paper S held on the outer peripheral portion of the impression cylinder 15 is started. In this state, as in the case shown in FIG. 50, the cam follower 88 of the gripper 83 is in contact with the mountain portion of the fixed cam 587, and the holding state of the leading end portion of the printing paper S is maintained.

In FIG. 57, the gripper 83 of the pressure drum 15 and the discharge drum 1 are rotated by further rotating the pressure drum 15 in this state.
7 shows a state in which the gripper 85 of No. 7 has moved to a position facing the gripper 85. In the state shown in this figure, the stopper 5
By the action of 97, the main link 592 is in a state similar to the state in which the cam follower 594 is in contact with the mountain portion of the cam 591, and therefore the moving cams 584, 585,
586 and fixed cams 587, 588, 589 are shown in FIG.
There is a layout relationship shown in.

Therefore, as in the case shown in FIG. 54, the impression cylinder 1
When the cam follower 88 of the gripper 83 of No. 5 comes into contact with the trough of the fixed cam 587, the opening operation of the gripper 83 is executed. In addition, the gripper 85 of the discharge cylinder 17
The closing operation of the gripper 85 is executed by the cam follower 90 in the above-mentioned contacting with the trough portion of the fixed cam 589. Therefore, the print sheet S is transferred from the gripper 83 to the gripper 85.

Further, in this state, the second printing paper S is held and conveyed by the gripper 84 of the paper feed cylinder 16.

In FIG. 58, the gripper 83 of the pressure drum 15 ejecting the printing paper S to the paper ejection drum 17 and the paper feed holding the second printing paper S are held by further rotating the pressure drum 15 in this state. It shows a state in which the gripper 84 of the paper cylinder 16 has moved to a position facing the gripper 84. Even in the state shown in this figure,
Due to the action of the stopper 597, the main link 592 is in a state similar to the state in which the cam follower 594 of the main link 592 is in contact with the mountain portion of the cam 591.
4, 585, 586 and fixed cams 587, 588, 5
Reference numeral 89 has the layout shown in FIG.

Therefore, similarly to the state shown in FIG. 49, the cam follower 89 in the gripper 84 of the paper feed cylinder 16 performs the opening operation by the action of the fixed cam 588, and the cam follower 88 in the gripper 83 of the impression cylinder 15 is opened. The closing operation is executed by abutting on the mountain portion of the fixed cam 587. As a result, the front end of the printing paper S is moved to the gripper 8
4 to the gripper 83.

Then, the impression cylinder 15, the paper feed cylinder 16, and the paper ejection cylinder 1
7 and the reversing cylinder 18 are rotated further, so that FIG.
As shown in 9, printing on the second printing sheet S held on the outer peripheral portion of the impression cylinder 15 is started. In addition, the output cylinder 17
The printing paper S held by is conveyed to a position above the paper discharge unit 28 along the chain 19 and is discharged onto the paper discharge unit 28.

Next, the transfer operation of the printing paper S when two-sided two-color printing is performed on the front surface and the back surface of the printing paper S using two color inks of cyan and magenta will be described. In this case, printing is executed by the operation shown in FIGS.

60 to 67 are explanatory views showing the transfer operation of the printing paper S in such a case. 60 to 67, the printing paper S2 shown in FIG. 60 is transferred from the gripper 84 of the paper feed cylinder 16 to the gripper 83 of the impression cylinder 15 during the continuous execution of printing. From the state, the print sheet S shown in FIG.
The state in which the rear end of 2 is passed to the gripper 86 of the reversing cylinder 18 is illustrated every time the impression cylinder 15, the paper feeding cylinder 16, the paper ejection cylinder 17, and the reversing cylinder 18 rotate by 90 °. Note that FIG.
In FIGS. 0 to 67, for convenience of description, the print sheets S are denoted by reference numerals S1 to S4 in the order in which they are supplied.
Each print sheet S can be identified.

Further, in FIGS. 60 to 67, FIG.
~ Each link 61 of the second link mechanism 200 shown in Fig. 31
2, 617, 618, 619 and the connecting plate 621 are shown in a simplified manner. Further, in this case, since the first link mechanism 100 is fixed, the illustration of the first link mechanism 100 is omitted. Also, the release mechanism 300 is not shown.

When two-sided two-color printing is performed on the front surface and the back surface of the printing paper S by using two color inks of cyan and magenta, as described above, the first link mechanism 100 is fixed, and the second link mechanism 100 is fixed. By making the link mechanism 200 and the release mechanism 300 movable, the new printing paper S supplied from the paper feed unit 27 is fed via the paper feed cylinder 16 every time the impression cylinder 15 makes two revolutions. It is necessary to invert the printing paper S from the impression cylinder 15 to the paper feed cylinder 16 via the paper ejection cylinder 17 and the reversing cylinder 18 again.

In this case, the second link mechanism 2
The drive of the solenoid 622 at 00 causes the stopper 62
By fixing 4 to the position shown in FIG. 31, the main link 612 is made swingable and the release mechanism 300
By fixing the stopper 643 to the position shown in FIG. 31 by driving the solenoid 641 in FIG.
Leave 1 movable.

When printing is continuously executed in such a state, in the state shown in FIG. 60, the leading edge of the print sheet S1 is held by the gripper 85 of the paper discharge cylinder 17. In addition, the front end of the printing paper S3 has a gripper 84 of the paper feed cylinder 16.
From the pressure drum 15 to the gripper 83. Further, the rear end of the printing paper S2 held by the gripper 85 which moves along the chain 19 at its front end becomes the front end after reversing and is transferred to the grippers 86 to 87 of the reversing cylinder 18. The transfer operation from the grippers 86 to 87 is executed by the transfer mechanism shown in FIG. 4, as described above. At this time, the cam follower 90 of the gripper 85 running along the chain 19 while holding the leading edge of the print sheet S2 contacts the contact member 41 of the release mechanism 300, so that the gripper 85 performs the opening operation. To do.

From this state, the impression cylinder 15 and the paper feed cylinder 1 are further
6, when the discharge cylinder 17 and the reversing cylinder 18 are rotated by 90 °, as shown in FIG. 61, the leading end of the printing paper S1 is held by the gripper 85 of the discharge cylinder 17, and the chain 19 is held.
Move along. Further, the leading edge of the printing paper S3 is held by the gripper 83 of the impression cylinder 15, and the ink is transferred from the first blanket cylinder 13. Furthermore, the printing paper S
The tip of the sheet feeding cylinder 1 is fed by the gripper 87 of the reversing cylinder 18.
6 is conveyed.

From this state, the impression cylinder 15 and the paper feed cylinder 1 are further
6, when the discharge cylinder 17 and the reversing cylinder 18 are rotated by 90 °, as shown in FIG. 62, the leading end of the printing paper S1 is held by the gripper 85 of the discharge cylinder 17, and the chain 19 is held.
Move further along. Further, the leading edge of the printing paper S3 is held by the gripper 83 of the impression cylinder 15, and the ink is further transferred from the second blanket cylinder 14. Further, the front end of the printing paper S2 has a gripper 87 of the reversing cylinder 18.
Is further conveyed toward the paper feed cylinder 16.

From this state, the impression cylinder 15 and the paper feed cylinder 1 are further
6, when the discharge cylinder 17 and the reversing cylinder 18 are rotated by 90 °, as shown in FIG. 63, the front end of the printing paper S1 is held by the gripper 85 of the discharge cylinder 17, and the chain 19 is held.
After further moving along, the paper is discharged to the paper discharge unit 28.
At this time, the cam follower 90 of the gripper 85 holding the print sheet S1 passes directly below the contact member 41 of the release mechanism 300. Further, the front end of the printing paper S3 is fed from the gripper 83 of the impression cylinder 15 to the discharge cylinder 17
Is transferred to the gripper 85. Further, the printing paper S2
The front end of the sheet is transferred from the gripper 87 of the reversing cylinder 18 to the gripper 84 of the sheet feeding cylinder 16.

At this time, in the state shown in FIG.
Due to the action of the second link mechanism 200, the moving cam 578 on the paper feed cylinder 16 is in the state shown in FIG. Therefore, the cam follower 89 of the gripper 84 of the paper feed cylinder 16 comes into contact with the moving cam 578, so that the gripper 84 performs the opening / closing operation and receives the leading end of the printing paper S2 from the gripper 87 of the reversing cylinder 18. .

Further, in the state shown in FIG. 63, the second
Due to the action of the link mechanism 200, the moving cams 43, 45, and 48 shown in the reversing cylinder 18 are in the state shown in FIG. Therefore, the gripper 87 holding the front end of the printing paper S2 is opened to pass the printing paper S2 to the gripper 84 of the paper feed cylinder 16. The other gripper 86 is
The operation of holding the trailing edge of the print sheet S1 that moves along the chain 19 is not executed.

From this state, the impression cylinder 15 and the paper feed cylinder 1 are further
6, when the discharge cylinder 17 and the reversing cylinder 18 are rotated by 90 °, as shown in FIG. 64, the leading end of the print sheet S3 is conveyed while being held by the gripper 85 of the discharge cylinder 17. Also,
The front end of the printing paper S2 is transferred from the gripper 84 of the paper feed cylinder 16 to the gripper 83 of the impression cylinder 15.

From this state, the impression cylinder 15 and the paper feed cylinder 1 are further
6, when the discharge cylinder 17 and the reversing cylinder 18 are rotated by 90 °, as shown in FIG. 65, the leading end of the print sheet S3 is held by the gripper 85 of the discharge cylinder 17, and the chain 19 is held.
Move along. The leading edge of the printing paper S2 is held by the gripper 83 of the impression cylinder 15, and the ink is transferred from the first blanket cylinder 13.

From this state, the impression cylinder 15 and the paper feed cylinder 1 are further
6, when the discharge cylinder 17 and the reversing cylinder 18 are rotated by 90 °, as shown in FIG. 66, the chain 19 is held with the front end of the printing paper S3 being held by the gripper 85 of the discharge cylinder 17.
Move further along. In addition, the leading edge of the printing paper S2 is held by the gripper 83 of the impression cylinder 15, and ink is further transferred from the second blanket cylinder 14. Also,
Further, the next printing sheet S4 is fed from the sheet feeding section 27, and the leading end thereof is held by the gripper 84 of the sheet feeding cylinder 16.

From this state, the impression cylinder 15 and the paper feed cylinder 1 are further
6, when the discharge cylinder 17 and the reversing cylinder 18 are rotated by 90 °, as shown in FIG. 67, the printing paper S3 is attached to the chain 19 with its front end held by the gripper 85 of the discharge cylinder 17. The gripper 86 of the reversing cylinder 18 holds the rear end of the reversing cylinder 18 while moving further. Further, the front end of the printing paper S2 is fed from the gripper 83 of the impression cylinder 15 to the discharge cylinder 1
It is delivered to the gripper 85 of No. 7. Furthermore, the printing paper S
The leading end of the sheet 4 is held by the gripper 84 of the sheet feeding cylinder 16 and conveyed toward the impression cylinder 15.

At this time, in the state shown in FIG. 67,
Due to the action of the second link mechanism 200, the moving cam 578 on the paper feed cylinder 16 is in the state shown in FIG. Therefore, the cam follower 89 of the gripper 84 in the paper feed cylinder 16 does not contact the moving cam 578, and the gripper 84 does not execute the opening / closing operation at this position.

Further, in the state shown in FIG. 67, the second
Due to the action of the link mechanism 200, the moving cams 43, 45, and 48 shown in the reversing cylinder 18 are in the state shown in FIG. Therefore, the gripper 87 does not perform the transfer operation of the print sheet S4 with the gripper 84 of the paper feed cylinder 16. On the other hand, the other gripper 86 is connected to the chain 19
The opening / closing operation for holding the trailing edge of the printing paper S1 moving along is executed.

In this way, by performing the operation shown in FIGS. 60 to 67 by the action of the second link mechanism 200, double-sided printing is performed on the printing paper S.

As described above, by using the first and second link mechanisms 100 and 200 and the release mechanism 300, the gripper 83 and the paper feed cylinder 16 in the impression cylinder 15 are used.
Gripper 84 on the paper and gripper 8 on the discharge cylinder 17
By controlling the opening / closing operations of the grippers 86 and 87 in the No. 5 and the reversing cylinder, it is possible to selectively execute printing in either one of monochrome printing mode, multicolor printing mode, simplex printing mode and duplex printing mode.

Next, the structure of the characteristic part of the present invention will be described. As described above, when the length of the print sheet S in the transport direction is changed due to the change of the size of the print sheet S, the gripper 86 of the reversing cylinder 18 shown in FIG.
It is necessary to change the holding timing of the trailing edge of the printing paper S due to. For this reason, this printing apparatus employs a displacement mechanism for changing the holding timing of the rear end portion of the printing paper S by the gripper 86 of the reversing cylinder 18.

FIG. 68 is a schematic side view showing this displacement mechanism.

The impression cylinder 15 and the discharge cylinder 17 described above are the first
Is rotatably supported by the connecting member 711. The first connecting member 711 is rotatable about the axis of the impression cylinder 15. Therefore, the discharge cylinder 17
While being connected to the impression cylinder 15 by the first connecting member 711, it is movable around the axis of the impression cylinder 15.

The paper feed cylinder 16 and the reversing cylinder 18 described above are rotatably supported by the second connecting member 712. The second connecting member 712 is connected to the paper feed cylinder 16
It is possible to rotate around the axis of. Therefore, the reversing cylinder 18 is movable around the axis of the paper feed cylinder 16 while being connected to the paper feed cylinder 16 by the second connecting member 712.

Further, the discharge cylinder 17 and the reversing cylinder 18 are connected to each other by the third connecting member 713.

The first connecting member 711 is the air cylinder 7
It is connected to the printing apparatus main body via 14. Therefore, when the first connecting member 711 is rotated about the axis of the impression cylinder 15 by driving the air cylinder 714, the first connecting member 711 and the third connecting member 71 are rotated.
The second connecting member 712 connected via 3 rotates about the axis of the paper feed cylinder 16, and the paper feed cylinder 16 and the paper discharge cylinder 1
The distance between the shaft and 7 is changed. Note that reference numeral 715 in FIG. 68 is a gas spring for stabilizing the rotational movement of the first and second connecting members 711 and 712.

On the other hand, as shown in FIG. 69, a first gear 701 is arranged on the side of the impression cylinder 15 concentrically with the impression cylinder 15. The first gear 7 is provided on the side of the paper feed cylinder 16.
A second gear 702 meshing with 01 is arranged coaxially with the paper feed cylinder 16. Further, on the side of the discharge cylinder 17, the first
The third gear 703 that meshes with the gear 701 of
Are arranged concentrically with. Further, a fourth gear 704, which meshes with the second gear 702, is arranged laterally of the reversing cylinder 18 concentrically with the reversing cylinder 18.

FIG. 71 shows these gears 701, 702,
FIG. 7 is an axial development view showing the positional relationship between 703 and 704.

As is clear from this figure, the first gear 701 and the second gear 702, the first gear 701 and the third gear 703, and the second gear 702 and the fourth gear 7
No. 04 is in mesh with each other, but the third gear 703 and the fourth gear 704 are not in mesh with each other. 69. In FIG. 69, the mark “◯” indicates the positions where the gears mesh with each other, and the “x” mark indicates the positions where the gears do not mesh with each other.

Therefore, when the first connecting member 711 is rotated counterclockwise from the state shown in FIG. 68 about the axis of the impression cylinder 15 by driving the air cylinder 714, Connecting member 711 and third connecting member 7
The second connecting member 712 connected via 13 rotates counterclockwise about the axis of the sheet feeding cylinder 16, and
The third connecting member 713 rotates clockwise about the axis of the paper discharge cylinder 17. Due to the rotation of the first, second, and third connecting members 711, 712, and 713, the paper discharge cylinder 17 and the reversing cylinder 18 move, and the paper discharge cylinder 17 and the reversing cylinder 1
8, the first, second, third, and fourth gears 70 are moved.
The positional relationship of 1, 702, 703, and 704 is displaced from the state shown in FIG. 69 to the state shown in FIG.

72 and 73 show the aforementioned impression cylinder 15
6 is a schematic side view showing the positional relationship between the cams 573 and 574 forming the fixed cam 587 of FIG.

Of the cams 573 and 574 forming the fixed cam 587 of the impression cylinder 15, the cam 573 is the first connecting member 7.
11 and the cam 574 is fixed to the main body of the printing apparatus. In addition, the fixed cams 44, 4 of the reversing cylinder 18
The fixed cams 44 and 46 of 6, 6 are fixed to the second connecting member 712, and the fixed cam 47 is fixed to the third connecting member 713.

Therefore, as described above, the first, second, and third connecting members 71 are driven by driving the air cylinder 714.
1, 712, 713 are rotated, and the positional relationship of the first, second, third, and fourth gears 701, 702, 703, 704 is displaced from the state shown in FIG. 69 to the state shown in FIG. 70. In this case, the fixed cam 5 of the impression cylinder 15 is accompanied by this.
The positional relationship between the cams 573, 574 and the fixed cams 44, 46, 47 of the reversing cylinder 18 constituting 87 is displaced from the state shown in FIG. 72 to the state shown in FIG. 73.

In the printing apparatus having the displacement mechanism having the above-described structure, the printing paper S having a long length in the transport direction is used.
In the case of performing double-sided printing, the impression cylinder 15, the paper feed cylinder 16, the paper discharge cylinder 17, the reversing cylinder 18, and the first, second, and
Double-sided printing is performed by setting the third and fourth gears 701, 702, 703, and 704 in the states shown in FIGS. 69 and 72.

On the other hand, when performing double-sided printing on the printing paper S having a short length in the transport direction, the air cylinder 1
4 drive, the first, second and third connecting members 711,
By rotating 712 and 713, the positional relationship between the first, second, third, and fourth gears 701, 702, 703, and 704 is shown in FIG.
70 is displaced from the state shown in FIG. 9 to the state shown in FIG. 70, and the cam 573 forming the fixed cam 587 of the impression cylinder 15,
After displacing the positional relationship between the fixed cams 574 and the fixed cams 44, 46, 47 of the reversing cylinder 18 from the state shown in FIG. 72 to the state shown in FIG. 73, double-sided printing is performed.

In such a state, the third gear 703 moves while rotating in the counterclockwise direction together with the paper discharge cylinder 17 in accordance with the above-described displacement operation. In addition, with the displacement operation described above, the fourth gear 704 also moves together with the reversing cylinder 18 while rotating counterclockwise. Therefore, the discharge cylinder 17 and the reversing cylinder 18 rotate in the directions in which the phases thereof are opposite to each other, and the discharge cylinder 1 which should hold the leading edge of the printing paper S.
The gripper 85 of No. 7 and the gripper 86 of the reversing cylinder 18 which should hold the trailing end of the printing paper S move in the directions in which they approach each other. Therefore, even when the length of the print sheet S in the transport direction becomes small, the rear end can be reliably held by the gripper 86.

When the above-described displacement operation is executed, the transfer timing of the printing paper S from the impression cylinder 15 to the discharge cylinder 17 is changed by contacting the cam follower 88 that opens and closes the gripper 83 of the impression cylinder 15. Cam 57
Since 3 is fixed to the first connecting member 711,
With the rotation of the first connecting member 711, the first gear 70
Due to the action of the first and second gears 702, even when the phase of the discharge cylinder 17 with respect to the impression cylinder 15 is changed, the positional relationship between the cam 573 and the discharge cylinder 17 is maintained constant,
The printing paper S can be delivered from the impression cylinder 15 to the paper ejection cylinder 17 at an appropriate timing.

Further, the fixed cam 47 for changing the timing for holding the rear end of the printing paper S by contacting the cam follower 91 for opening and closing the gripper 86 of the reversing cylinder 18.
Is fixed to the third connecting member 713, and therefore, as described above, even when the phases of the discharge cylinder 17 and the reversing cylinder 18 are changed together with the third gear 703 and the fourth gear 704, The positional relationship between the fixed cam 46 and the discharge cylinder 17 is maintained constant, and the discharge cylinder 17 (chain 19)
Therefore, the printing paper S can be delivered to the reversing cylinder 18 at an appropriate timing.

Further, the fixed cam 46 for changing the transfer timing of the printing paper S from the reversing cylinder 18 to the paper feeding cylinder 16 by contacting with the cam follower 91 for opening and closing the gripper 87 of the reversing cylinder 18 is the second connecting member. Since it is fixed to 712, the phase of the reversing cylinder 18 with respect to the sheet feeding cylinder 16 is changed by the action of the second gear 702 and the fourth gear 704 with the rotation of the second connecting member 712. In this case, the positional relationship between the fixed cam 46 and the paper feed cylinder 16 is maintained constant, and the reversing cylinder 18 moves to the paper feed cylinder 16
The print sheet S can be delivered at an appropriate timing.

As described above, when the above-mentioned displacement mechanism is used, even if the length of the print sheet S in the conveying direction is changed, the rear end of the print sheet S is surely held. It becomes possible to perform the front-back reversal. Therefore, it is possible to perform double-sided printing on the printing paper S having different sizes.

In the above description, since double-sided printing is performed on the printing paper S of two different sizes, the air cylinder 14 is driven to drive the first, second, third and fourth gears 7.
The positional relationship between 01, 702, 703, and 704 is selectively switched between the state shown in FIG. 69 and the state shown in FIG. 70, and the cam 573 forming the fixed cam 587 of the impression cylinder 15 is
The case where the positional relationship between the fixed cams 574 and the fixed cams 44, 46, 47 of the reversing cylinder 18 is selectively switched between the state shown in FIG. 72 and the state shown in FIG. 73 has been described. , First, second, third and fourth gears 701, 702, 703,
The arrangement relationship of 704 is set to an intermediate state between the state shown in FIG. 69 and the state shown in FIG. 70, and the cams 573 and 574 and the reversing cylinder 18 that form the fixed cam 587 of the impression cylinder 15.
The fixed cams 44, 46, 47 may be arranged in an intermediate state between the state shown in FIG. 72 and the state shown in FIG.

[0240]

According to the first aspect of the present invention, the first gear is provided on the side of the impression cylinder so as to be concentric with the impression cylinder,
A second gear that is arranged concentrically with the paper feed cylinder on the side of the paper feed cylinder and meshes with the first gear, and a second gear that is arranged concentrically with the paper ejection cylinder on the side of the paper ejection cylinder. A third gear that meshes with the first gear, a fourth gear that is arranged concentrically with the reversing cylinder on the side of the reversing cylinder and that meshes with a second gear, a first gear and a second gear
And a displacement mechanism that changes the axial distance between the paper feed cylinder and the paper discharge cylinder while maintaining the meshing relationship between the first gear and the third gear, and the second gear and the fourth gear. With this configuration, the printing paper can be delivered even when the length of the printing paper in the transport direction is changed.
Therefore, the printing paper can be turned upside down regardless of the size of the printing paper, which allows double-sided printing on the printing paper.

According to the second aspect of the present invention, the displacement mechanism includes the first connecting member which is rotatable about the axis of the impression cylinder in a state where the impression cylinder and the discharge cylinder are connected, and the feeding mechanism. A second connecting member that is rotatable around the axis of the paper feed cylinder in a state where the paper cylinder and the reversing cylinder are connected, a third connecting member that connects the paper ejection cylinder and the reversing cylinder, and a first , And the driving means for rotating the second connecting member, it is possible to obtain a necessary displacement by rotating the first and second connecting members by the driving means.

According to the third aspect of the present invention, the first changing mechanism for changing the timing of delivering the print sheet from the first holding mechanism to the third holding mechanism, and the third holding mechanism. To a fourth holding mechanism for changing the timing of delivering the printing paper to the fourth holding mechanism, and for changing the timing of delivering the printing paper from the fourth holding mechanism to the second holding mechanism. Since the third change mechanism is further provided, it is possible to transfer the print sheet at a timing according to the displacement.

According to the invention described in claim 4, the first changing mechanism includes a cam mechanism attached to the first connecting member,
Since the second changing mechanism includes the cam mechanism attached to the third connecting member, and the third changing mechanism includes the cam mechanism attached to the second connecting member, it is easy to transfer the printing paper. Can be changed to.

[Brief description of drawings]

FIG. 1 is a schematic side view of a printing apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing an arrangement of image areas 67 on a printing plate P.

FIG. 3 is a schematic view showing a cylinder inserting mechanism of a first blanket cylinder 13.

FIG. 4 is a schematic view showing a rotating mechanism of grippers 86 and 87 in the reversing cylinder 18.

FIG. 5 is an explanatory diagram showing a front / back surface reversing operation of the printing paper S by a printing paper reversing mechanism.

FIG. 6 is an explanatory diagram showing a front / back surface reversing operation of the printing paper S by a printing paper reversing mechanism.

FIG. 7 is an explanatory diagram showing a front / back surface reversing operation of the printing paper S by a printing paper reversing mechanism.

FIG. 8 is a block diagram showing a main electrical configuration of the printing apparatus.

FIG. 9 is a flowchart showing an outline of plate making and printing operations by the printing apparatus.

FIG. 10 is a flowchart showing a plate making process.

FIG. 11 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 12 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 13 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 14 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 15 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 16 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 17 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 18 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 19 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 20 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 21 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 22 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 23 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 24 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 25 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 26 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 27 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 28 is a schematic side view showing a schematic arrangement of a plurality of fixed cams and movable cams in a cam mechanism for opening and closing each gripper 83, 84, 85, 86, 87.

FIG. 29 is a schematic side view showing a moving mechanism for moving the moving cam.

FIG. 30 is a schematic side view showing a moving mechanism for moving the moving cam.

FIG. 31 is a schematic side view showing a moving mechanism for moving a moving cam.

FIG. 32 is an explanatory diagram showing a positional relationship between moving cams 584, 585, 586 and fixed cams 587, 588, 589.

FIG. 33 is an explanatory diagram showing a positional relationship between moving cams 584, 585, 586 and fixed cams 587, 588, 589.

FIG. 34 shows movable cams 576 and 578 in the paper feed cylinder 16.
It is explanatory drawing which shows with fixed cam 588.

FIG. 35 shows movable cams 576 and 578 on the paper feed cylinder 16.
It is explanatory drawing which shows with fixed cam 588.

FIG. 36 is a schematic view showing an opening / closing mechanism of grippers 86, 87 in the reversing cylinder 18.

FIG. 37 is a view showing a fixed cam 4 arranged laterally of the reversing cylinder 18.
It is explanatory drawing which shows the arrangement | positioning relationship of 4,46,47 and the moving cams 43,45,48.

FIG. 38 shows a fixed cam 4 arranged on the side of the reversing cylinder 18.
It is explanatory drawing which shows the arrangement | positioning relationship of 4,46,47 and the moving cams 43,45,48.

FIG. 39 is a side view of the moving cam 43.

40 is a side view of the fixed cam 44. FIG.

41 is a side view of the moving cam 45. FIG.

42 is a side view of the fixed cam 46. FIG.

43 is a side view of the fixed cam 47. FIG.

44 is a side view of the moving cam 48. FIG.

45 is a side view of the release mechanism 300. FIG.

46 is a side view of the release mechanism 300. FIG.

FIG. 47 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 48 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 49 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 50 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 51 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 52 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 53 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 54 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 55 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 56 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 57 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 58 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 59 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 60 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 61 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 62 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 63 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 64 is an explanatory diagram showing a delivery operation of the printing paper S.

FIG. 65 is an explanatory diagram showing a delivery operation of the printing paper S.

66 is an explanatory diagram showing a delivery operation of the printing paper S. FIG.

67 is an explanatory diagram showing a delivery operation of the printing paper S. FIG.

68 is a schematic side view showing the displacement mechanism. FIG.

69 is a schematic side view showing the positional relationship between gears 701, 702, 703, and 704. FIG.

FIG. 70 is a schematic side view showing a positional relationship between gears 701, 702, 703, and 704.

71 is an axial development view showing the positional relationship between gears 701, 702, 703, and 704. FIG.

72 is a cam 5 that constitutes a fixed cam 587 of the impression cylinder 15. FIG.
73, 574 and the fixed cams 44, 46 of the reversing cylinder 18,
It is a side surface schematic diagram which shows the arrangement relationship of 47.

FIG. 73 is a cam 5 forming a fixed cam 587 of the impression cylinder 15.
73, 574 and the fixed cams 44, 46 of the reversing cylinder 18,
It is a side surface schematic diagram which shows the arrangement relationship of 47.

[Explanation of symbols]

11 First plate cylinder 12 Second plate cylinder 13 First Blanket Body 14 Second Blanket Body 15 impression cylinder 16 Paper feed cylinder 17 Output cylinder 18 inverted body 20 Ink supply device 21 Dampening water supply system 23 Plate Supply Department 24 Plate ejection section 25 Image recording device 26 Development Processing Equipment 27 Paper feeder 28 Paper output section 701 first gear 702 Second gear 703 Third gear 704 Fourth gear 711 First connection member 712 Second connection member 713 Third connection member 714 Air cylinder P printing plate S printing paper

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 10-323963 (JP, A) JP 61-68249 (JP, A) JP 9-239946 (JP, A) Special table 9- 510410 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41F 7/02 B41F 7/10 B41F 21/00-21/10 B65H 15/00

Claims (4)

(57) [Claims] 1. A first holding mechanism for holding an edge of a print sheet, an impression cylinder for performing printing with the print sheet mounted on an outer peripheral portion thereof, and an edge of the print sheet. And a third holding mechanism for holding the edge of the printing paper, and a second holding mechanism for holding the edge of the printing paper. A discharge cylinder for discharging the print paper and a fourth holding mechanism for holding the edge of the print paper are provided, and the rear end of the print paper discharged from the discharge cylinder is received as a head, and this print paper is received. A reversing cylinder for reversing the front and back of a printing sheet by supplying it to the paper replenishing cylinder again, comprising: And a gear arranged on the side of the paper feed cylinder concentrically with the paper feed cylinder, A second gear that meshes with the first gear; a third gear that is arranged concentrically with the discharge cylinder on the side of the discharge cylinder and that meshes with the first gear; A fourth gear which is arranged concentrically with the reversing cylinder on the side of the barrel and meshes with the second gear; the first gear and the second gear; the first gear and the A third gear, and a displacement mechanism that changes an axial distance between the paper feed cylinder and the paper discharge cylinder while maintaining the meshing relationship between the second gear and the fourth gear. A printing device characterized by the above. 2. The printing apparatus according to claim 1, wherein the displacement mechanism is rotatable about an axis of the impression cylinder in a state where the impression cylinder and the discharge cylinder are connected to each other. A connecting member; a second connecting member which is rotatable about an axis of the paper feeding cylinder in a state where the paper feeding cylinder and the reversing cylinder are connected; and the paper ejection cylinder and the reversing cylinder. And a drive unit that rotates the first and second connecting members. 3. The printing apparatus according to claim 2, wherein a first changing mechanism for changing a timing of delivering the print sheet from the first holding mechanism to the third holding mechanism, A second changing mechanism for changing the timing of delivery of the print sheet from the third holding mechanism to the fourth holding mechanism; and delivery of the print sheet from the fourth holding mechanism to the second holding mechanism And a third changing mechanism for changing the timing of the printing device. 4. The printing apparatus according to claim 3, wherein the first changing mechanism includes a cam mechanism attached to the first connecting member, and the second changing mechanism includes the third connecting member. A printing mechanism including a cam mechanism attached to the second connecting member, and the third changing mechanism including a cam mechanism attached to the second connecting member.