JP6899658B2 - Printer - Google Patents

Description

The present invention relates to a printing machine capable of performing double-sided printing on sheet paper.

As a printing machine capable of performing double-sided printing on sheet paper, the "sheet processing apparatus" described in Patent Document 1 has been proposed. In this device, the printing cylinder and the suction cylinder are rotationally driven by a drive unit different from the plurality of cylinders including the printing cylinder and the suction cylinder so as to rotate the printing cylinder and the suction cylinder synchronously depending on the length of the sheet to be handled in the transport direction.

In the apparatus of Patent Document 1, if the drive unit for driving the suction cylinder fails, the synchronization between the printing cylinder and the suction cylinder is lost. In that case, there is a possibility that the portion protruding from the body (gripper or the like) collides with the outer peripheral surface of another adjacent body.

Such a danger is not limited to the printing machine in which the suction cylinder is driven separately as in Patent Document 1, but is separated from the other cylinder (hereinafter, referred to as “this machine side cylinder”) by another drive unit. It exists in a printing press having a body that is driven to rotate.

Japanese Unexamined Patent Publication No. 2014-234262

Therefore, it is an object of the present invention to provide a printing machine capable of avoiding collision of a part of the cylinders with each other in the event of a failure of a drive unit other than the drive unit of the side cylinder of the machine.

The printing machine of the present invention is a part of a reversing mechanism for reversing the front and back sides of a sheet of paper in a printing machine capable of performing double-sided printing on the sheet of paper, and grabs the edge of the sheet of paper. A reversing-related cylinder having a sheet-sheet holding portion protruding from the outer peripheral surface, a plurality of machine side cylinders provided by the printing machine different from the reversing-related body, and the plurality of machine side cylinders are rotated. A first drive source to be driven, a second drive source provided separately from the first drive source and rotationally driving the reversal-related cylinder, and a second drive source to be driven from the first drive source in the event of a failure of the second drive source. By rotating the reversing-related cylinder by transmitting a force to the reversing-related cylinder, the machine-side cylinder adjacent to the reversing-related cylinder among a part of the reversing-related cylinder and the plurality of machine-side cylinders. It is characterized by being provided with a collision avoidance means for avoiding a collision with a part of the paper.

In the printing machine of the present invention having the above configuration, a part of the reversing-related cylinder and a plurality of side cylinders of the machine are used between the time when the second drive source fails and the time when the printing machine is stopped by the collision avoidance means. Of these, it is possible to prevent a part of the machine side cylinder adjacent to the reversing-related cylinder from colliding. Therefore, each of the cylinders is damaged, and the time and cost required for repair can be eliminated.

Further, the collision avoiding means can be operated within a range corresponding to the length of the sheet of paper in the transport direction.

With this configuration, during normal operation of the printing press, it corresponds to the length of the sheet in the transport direction between the reversing-related cylinder and the machine-side cylinder adjacent to the reversing-related cylinder among the plurality of machine-side cylinders. Even if the operation is performed, appropriate collision prevention can be achieved by operating the collision avoiding means within a range corresponding to the length of the sheet in the transport direction.

Further, in the reversing-related cylinder, the paper head of the sheet paper conveyed by the processing cylinder, which is one of the plurality of machine side cylinders, is held by the sheet paper holding portion, and the plurality of machine side cylinders are held. It can be assumed that the reversing cylinder, which is one of the above, is a reversing cylinder that delivers the sheet paper with the paper end of the sheet paper as the head.

With this configuration, even if the drive source is provided with an inverted transfer cylinder different from that of the machine side cylinder, appropriate collision prevention is possible.

Further, during normal operation in which the reversing transfer cylinder is rotationally driven by the second drive source, the reversible transfer cylinder is driven so as to have a variable rotation speed according to the length of the sheet in the transport direction, and the collision avoiding means is driven by the second drive. In the event of a source failure, a driving force transmitting member that receives a driving force from the first driving source and rotates so as to transmit the driving force to the inverted transfer cylinder and the inverted transfer cylinder are provided. The deviation means is provided with a deviation means that allows a deviation in a predetermined range in the circumferential direction and regulates a deviation exceeding the predetermined range between the driving force transmitting member and the reversing transfer cylinder. it can.

With this configuration, the collision avoidance means can be configured by the driving force transmitting member and the displacement means, so that the configuration of the collision avoidance means can be simplified.

Further, the inverted transfer cylinder includes at least one pair of a front segment located in front of the rotation direction and a rear segment located in the rear of the rotation direction during the normal operation, and the front segment and the rear segment are , One is rotatable with respect to the other with respect to the central axis of the inverted transfer cylinder, and the mutual positions can be changed according to the circumferential dimension corresponding to the transport direction length of the sheet of paper. The collision avoiding means can be fixed in a state, and the collision avoiding means includes an elongated hole provided so as to extend in the circumferential direction at each axial end of the front segment and the rear segment, and a part inside the elongated hole. Is located and rotates integrally with the driving force transmission member to transmit the driving force of the first driving source to the reversing transfer cylinder, the processing cylinder, the reversing cylinder, and the reversing transmission. A cam that is immovably arranged without interlocking with each of the cylinders and is arranged so as to face the axial end of the driving force transmitting member and the inverted transfer cylinder, and the radial position of the side surface changes. The portion and one end are rotatably provided with respect to the driving force transmission pin and the other end with respect to the axial end portion of the reversing transfer cylinder, and move while abutting along the side surface of the cam portion. It can be provided with a link portion having a cam follower to be provided.

Since the collision avoidance means can be mechanically configured by this configuration, the possibility that the collision avoidance means itself breaks down can be reduced as compared with the configuration in which the collision avoidance means is electrically controlled. Therefore, a highly reliable printing machine can be realized.

According to the printing machine of the present invention, by providing the collision avoidance means, it is possible to prevent a part of the cylinders from colliding with each other in the event of a failure of a drive unit other than the drive unit of the side cylinder of the machine.

It is a schematic side view of the printing machine which concerns on one Embodiment of this invention. It is a side view of the cylinder which shows the state which the front segment of the reversing transfer cylinder is separated from the rear segment when the sheet paper to be printed is the maximum paper. It is a side view of the cylinder which shows the state which the front segment of the reversing transfer cylinder is close to the rear segment when the sheet paper to be printed is the smallest paper. It is a radial cross-sectional view which shows roughly the structure of the reversing transfer cylinder. It is an end view which shows roughly the structure of the reversing transfer cylinder. It is a radial sectional view which shows the 1st avoidance means. It is explanatory drawing about setting of the long hole of the 1st avoidance means, (A) and (B) show the relationship between the driving force transmission pin of this machine gear, and the front segment interlocking member, (C) and (D). Is the relationship between the driving force transmission pin of the machine gear and the rear segment, (E) is the state of (A) and (C) superimposed, and (F) is (A) and (D). The states of (G) are shown in an overlapping manner, and the states of (B) and (C) are shown in an overlapping manner. (A) to (D) are end-view schematic views of an arbitrary portion at the end of the reversing transfer cylinder, showing the operation of the second avoidance means. (E) to (H) are end-view schematic views of an arbitrary portion at the end of the inverted transfer cylinder, showing the operation of the second avoidance means following FIGS. 8A to 8D.

Hereinafter, an embodiment of the printing machine according to the present invention will be described with reference to the drawings. FIG. 1 schematically shows the printing press of the present embodiment. This printing machine was printed by the paper feeding unit 1 that feeds the sheet of paper toward the printing unit 2, the printing unit 2 that receives and prints the sheet of paper from the paper feeding unit 1, and the printing unit 2. It is provided with a paper ejection unit 3 for stocking sheet paper.

The paper feed unit 1 is a pre-print storage unit 11 for stocking sheet sheets and a feeder 12 as a paper feed device for feeding sheet sheets of the pre-print storage unit 11 to the printing unit 2 one by one. The paper feed cylinder 13, which is a small-diameter transfer cylinder that receives and conveys the sheet paper from the feeder 12, and the paper feed cylinder 13 that receives the sheet paper from the paper feed cylinder 13 and conveys it to the printing unit 2. It is provided with a paper feed side transfer cylinder 14 having twice the diameter. Each of the paper feed cylinder 13 and the paper feed side transfer cylinder 14 is provided with a gripper (not shown) for holding and holding the sheet of paper between the claw base and the claw, and a recess for accommodating the gripper. The sheet of paper is handed over.

The paper ejection unit 3 includes a post-printing storage unit (not shown) for stocking sheet sheets printed on one side or both sides of the printing unit 2, and a sheet sheet printed as described above by the printing unit 2. It includes a transport unit (here, a chain-type transport unit) 31 that transports the paper to the storage unit after printing.

The printing unit 2 is from an ink supply device (not shown) that receives and conveys the sheet paper from the paper feed side transfer cylinder 14 and receives the sheet paper from the print side transfer cylinder 21. It includes a processing cylinder 22 to which ink is supplied and prints on one side.

A plurality of sheets printed by the processing cylinder 22 are delivered below the printing unit 2, and a plurality of sheets for reversing the sheet to print the other side of the sheet and delivering it to the processing cylinder 22. It is provided with a reversing mechanism 4 having a body. The reversing mechanism 4 includes a reversing cylinder 41 arranged below the processing cylinder 22, and a reversing cylinder 42 arranged below the printing side transfer cylinder 21 that receives and inverts the sheet paper from the reversing cylinder 41. It has. In the present embodiment, the reversing transfer cylinder 41 corresponds to the reversing-related cylinder that constitutes a part of the reversing mechanism 4 for reversing the front and back of the sheet paper.

Of the cylinders constituting the printing unit 2 and the reversing mechanism 4, the cylinders other than the reversing transfer cylinder 41 are rotationally driven by a first drive source (not shown), and the reversing transfer cylinder 41 is provided separately from the first drive source. It is rotationally driven by two drive sources Ma (see FIGS. 4 and 6). In the following, when a specific body is not shown for the body excluding the inverted transfer body 41, it will be referred to as a “machine side body”. Further, the side driven by the first drive source will be referred to as "the machine side".

The printing side transfer cylinder 21 has a diameter approximately twice that of the paper feed cylinder 13, and two grippers 21G composed of a claw stand and a claw are spaced by approximately 180 degrees in order to hold and hold the sheet of paper. It is housed in each of the two recesses 21R formed in the printing side transfer cylinder 21 (see FIG. 2). Further, the processing cylinder 22 has a diameter approximately three times that of the paper feeding cylinder 13, and three grippers 22G composed of a claw base and a claw have an interval of approximately 120 degrees in order to hold and hold the sheet of paper. It is placed and housed in each of the three recesses 22R formed in the processing cylinder 22 (see FIG. 2).

The reversing transfer cylinder 41 has a diameter substantially twice that of the paper feed cylinder 13, and as shown in FIG. 2, rotates around a fixed segment (hereinafter referred to as “front segment”) 41A and a rotation center of the reversing transfer cylinder 41. Supports having a movable rotating segment (hereinafter referred to as “rear segment”) 41B are provided at two locations at intervals of 180 degrees in the circumferential direction. The front segment 41A is located in front of the reverse transfer cylinder 41 in the rotational direction during normal operation in which the reverse transfer cylinder 41 is rotationally driven by the second drive source Ma, and the rear segment 41B is in the reverse transfer cylinder 41 during normal operation. It is located behind in the direction of rotation. The inverted transfer cylinder 41 may include at least one pair of front segment 41A and rear segment 41B, and in this embodiment, two pairs are provided.

The outer peripheral surfaces of the front segments 41A and the rear segments 41B are formed in an arc shape and are arranged on the same curved surface. Then, each front segment 41A and each rear segment 41B are configured in a comb-teeth shape that can mesh with each other, and each rear segment 41B rotates with respect to each front segment 41A to approach the rear segment 41B. Then, it is possible to switch between a state in which the two are deeply meshed with each other and a state in which the meshing is substantially eliminated by separating from the rear segment 41B. Therefore, by rotating the front segment 41A at the center of rotation of the reversing transfer cylinder 41 to the side separated from the rear segment 41B by the maximum angle to substantially eliminate the engagement between the two, the length of the outer peripheral surface of the rear segment 41B in the circumferential direction can be obtained. The circumferential length including the circumferential length of the outer peripheral surface of the front segment 41A is set to be substantially equal to the longest length corresponding to the maximum transport direction length of the sheet paper handled by the printing press. (See Fig. 2). Further, by rotating the front segment 41A so as to deeply mesh with the rear segment 41B, the circumferential length of the outer peripheral surface of the front segment 41A plus the outer peripheral surface on the rear side of the rear segment 41B is the number of sheets handled by the printing press. The length of the leaf paper in the transport direction is set to be substantially equal to the shortest length corresponding to the shortest paper (see FIG. 3). Further, in the combination of two pairs of front and rear segments 41A and 41B, one front segment 41A is provided with a gripper 41G composed of a claw base and a claw as a sheet paper holding portion at the tip in the rotation direction for processing. The paper head, which is the tip (downstream end) of the sheet of paper from the body 22, can be held in addition to the paper head. Further, the rear end (upstream side end) of the sheet paper in which the paper head is added to the rear end in the rotation direction of one rear segment 41B paired with one front segment 41A by the gripper 41G of the one front segment 41A. ) Is provided with a sucker 41S that adsorbs the paper tail.

Next, the configuration of the reversing transfer cylinder 41 will be described in more detail with reference to FIGS. 4 and 5. For convenience of explanation, only one pair of front segment 41A and rear segment 41B is shown in FIGS. 4 and 5. In addition, the illustrated contents may not match other figures due to simplification or change of the positional relationship for the purpose of explaining the configuration.

The outer peripheral surface portion 411A of the front segment 41A and the outer peripheral surface portion 411B of the rear segment 41B of the inverted transfer cylinder 41 are arranged on the same curved surface. These outer peripheral surface portions 411A and 411B are formed in an arc shape.

A plurality of claw pieces 412 that are separated in the axial direction and extend in the circumferential direction are formed on the outer peripheral surface portion 411A of the front segment 41A. The outer peripheral surface portion 411B of the rear segment 41B is provided with a plurality of guide grooves 413 that are loosely fitted in each claw piece 412 in the circumferential direction and extend in the circumferential direction. The reversing transfer cylinder 41 includes the entire shaft 414 and the rotating shaft 415 concentrically. The overall shaft 414 is a rotation center and a shaft when the front segment 41A and the rear segment 41B integrally rotate around the axis. The rotation shaft 415 is a shaft that serves as a center of rotation when the front segment 41A is rotated relative to the rear segment 41B. The overall shaft 414 is supported by the frame F, and the rotation shaft 415 is externally fitted so as to be loosely fitted to the overall shaft 414.

The front segment 41A shares an axial center with the rear segment 41B, and is rotationally driven around the axial center by the second drive source Ma. On the other hand, the rear segment 41B can be rotated with respect to the front segment 41A by being rotationally driven around the axis by the rear segment rotation drive source Mb. A rear segment gear 4151 as a driven gear is attached to the rotating shaft 415, and a drive gear 4152 connected to the output shaft of the rear segment rotation drive source Mb is meshed with the rear segment gear 4151. Further, a front segment gear 4141 as a driven gear driven by the second drive source Ma was attached to the shaft end of the overall shaft 414, and was connected to the front segment gear 4141 to the output shaft of the second drive source Ma. The drive gear 4142 is meshed.

The circumferential length of the outer peripheral surface portion 411B of the rear segment 41B is the length in the transport direction of the sheet paper (the portion indicated by the symbol "P" indicated by the alternate long and short dash line in FIG. 5) handled by the printing press in the present embodiment. Is set to be approximately equal to the shortest distance corresponding to the shortest (minimum paper). Circumferential length obtained by adding the circumferential length of the outer peripheral surface portion 411B of the rear segment 41B to the circumferential length of the outer peripheral surface portion 411A of the front segment 41A in a state where the rear segment 41B is rotated by the maximum angle with respect to the front segment 41A. Is set to be substantially equal to the longest distance corresponding to the sheet having the longest transport direction length (maximum paper) among the sheet sheets handled by the printing press in the present embodiment.

The front segment 41A is provided with a tip-side holding means for holding the paper head, which is the tip (downstream-side edge) of the sheet of paper conveyed from the upstream side, on the tip-side in the rotation direction of the outer peripheral surface portion 411A. The rear segment 41B is provided with a rear end side holding means for holding the paper tail, which is the rear end (upstream side end) of the sheet of paper, on the rear end side of the outer peripheral surface portion 411B in the rotation direction.

The tip-side holding means is a gripper 41G that holds and holds the paper head (“P1” portion shown in FIG. 5) of the sheet of paper. The gripper 41G is rotatable on the body of the front segment 41A via the support shaft 416, and holds the paper head by rotating around the support shaft 416. The rear end side holding means is a sucker 41S that adsorbs the paper edge of the sheet of paper (the “P2” portion shown in FIG. 5) to the outer peripheral surface portion 411B of the rear segment 41B. In this case, the holding force of the sacker 41S is set to be smaller than the holding force of the sheet paper by the gripper 41G.

As described above, one of the front segment 41A and the rear segment 41B is rotatable with respect to the other with respect to the central axis of the inverted transfer cylinder 41, and the circumferential dimension corresponding to the transport direction length of the sheet paper. The mutual position can be changed according to the above, and it can be fixed in that state.

The reversing cylinder 42 is composed of a small cylinder having substantially the same diameter as the paper feeding cylinder 13, and accommodates a gripper 42G composed of a pair of claws in a recess 42R formed at one position in the circumferential direction. The reversing cylinder 42 makes two rotations while the reversing transfer cylinder 41 makes one rotation.

Here, the paper feed cylinder 13, the paper feed side transfer cylinder 14, the print side transfer cylinder 21, the processing cylinder 22, and the reversing cylinder 42 are mechanically interlocked and connected by gears (not shown), and one first drive source (1st drive source (1) It is configured to be rotationally driven by (not shown) to operate synchronously. On the other hand, the reversing transfer cylinder 41 is rotationally driven by a second drive source (for example, a servomotor) Ma different from the first drive source. Therefore, the inverted transfer cylinder 41 is driven separately from the plurality of machine side cylinders (for example, the processing cylinder 22 and the inverted cylinder 42 adjacent to the inverted transfer cylinder 41).

The second drive source Ma changes the rotation phase of the reversing transfer cylinder 41 by accelerating and decelerating the reversing transfer cylinder 41 according to the length of the sheet in the transport direction by a control unit (not shown) provided in the printing machine. Can be driven. Specifically, in the printing machine of the present embodiment, the second drive source Ma is driven by a sheet of paper having the maximum size that can be printed so that the reversing transfer cylinder 41 rotates in the same rotation phase with respect to a plurality of side cylinders of the machine. To do. On the other hand, when the length of the sheet of paper in the transport direction is smaller than the maximum dimension, the reversing transfer cylinder 41 decelerates and rotates by the amount of the dimensional difference, so that the paper tail is reduced with respect to the gripper 42G of the reversing cylinder 42. The second drive source Ma is driven to match. In this way, the reversing transfer cylinder 41 is driven in a variable rotation speed according to the length of the sheet in the transport direction during normal operation.

As described above, the gripper 41G protrudes from the inverted transfer cylinder 41. Further, the gripper 22G protrudes from the processing cylinder 22. Further, the gripper 42G protrudes from the reversing cylinder 42. However, during normal operation, since recesses are formed in the portions of each cylinder facing each gripper of the adjacent cylinders to prevent interference, some of the adjacent cylinders do not collide with each other.

However, when the second drive source Ma fails, for example, when the second drive source Ma stops or drives only at a low speed, the rotation of the reversing transfer cylinder 41 stops or the speed is lower than that during normal operation. It becomes a rotation. The "failure" is not limited to the failure of the second drive source Ma itself, but also includes the case where an abnormality occurs in the power supply to the second drive source Ma or the control of the second drive source Ma by the control unit. At the time of such a failure, the reversing transfer cylinder 41 will not be in phase with the adjacent machine side cylinders (processing cylinder 22, reversing cylinder 42). More specifically, the reversing transfer cylinder 41 rotates with respect to the adjacent machine side cylinders (processing cylinder 22, reversing cylinder 42) beyond a predetermined phase shift according to the length of the sheet in the transport direction. Will not fit. Then, a part of the reversing transfer cylinder 41 may collide with a part of the processing cylinder 22 or the reversing cylinder 42 adjacent to the reversing transfer cylinder 41.

Specifically, the following cases can be considered for this collision.
(1-1) Collision between the gripper 41G of the reversing transfer cylinder 41 and the outer peripheral surface of the processing cylinder 22.
(1-2) Collision between the gripper 22G of the processing cylinder 22 and the outer peripheral surface of the reversing transfer cylinder 41.
(2-1) Collision between the gripper 42G of the reversing cylinder 42 and the rear segment 41B of the reversing transit cylinder 41.
(2-2) Collision between the front segment 41A of the reversing cylinder 41 and the gripper 42G of the reversing cylinder 42.

In order to avoid these collisions, the printing machine of the present embodiment transmits the driving force from the first drive source to the reverse transfer cylinder 41 when the second drive source Ma fails, thereby transmitting the driving force to the reverse transfer cylinder 41. Even when the driving force of the second driving source Ma is not applied or the driving force is insufficiently applied, a part of the reversing transfer cylinder 41 and the processing cylinder 22 can be obtained by rotating the reversing transfer cylinder 41. And a collision avoiding means 5 for avoiding a collision with a part of the reversing cylinder 42 is provided.

Hereinafter, the configuration of the collision avoidance means 5 in the present embodiment will be described. The collision avoiding means 5 is provided over the side of the machine and the side of the reversing transfer cylinder 41. The collision avoiding means 5 includes a first avoiding means 51 composed of elongated holes 511A and 511B and driving force transmission pins 512A and 512B, and a second avoiding means 52 composed of a cam portion 521 and a link portion 522. To be equipped.

First, the first avoidance means 51 will be described. The first avoidance means 51 includes elongated holes 511A and 511B provided so as to extend in the circumferential direction at the axial end portions of the front segment 41A and the rear segment 41B, and a part inside the elongated holes 511A and 511B. Is located and rotates integrally with the machine gear 6 (see FIG. 6), and the driving force of the first drive source is transmitted to the reverse transfer cylinder 41 (front segment 41A and rear segment 41B). It includes 512A and 512B. In the present embodiment, as shown in FIG. 6, the driving force transmission pin 512A corresponding to the front segment interlocking member 4143 uses the shaft portion of the bolt screwed into the gear 6 of the machine, and the rear segment gear 4151. As the driving force transmission pin 512B corresponding to the above, the head of a bolt screwed into the gear 6 of the machine is used. However, the form of the driving force transmission pins 512A and 512B is not limited to this, and various forms can be used.

Three gears are provided at one end of the reversing transfer cylinder 41 (the end opposite to the paper surface side in FIG. 1). As shown in FIG. 6, these gears are arranged in the order of the machine gear 6, the rear segment gear 4151, and the front segment gear 4141 from the inside on the reverse transfer cylinder 41 side to the outside on the outside of the printing press. There is. When the second drive source Ma fails, the machine gear 6 functions as a drive force transmission member for receiving the drive force from the first drive source and transmitting the drive force to the reversing transfer cylinder 41. The front segment gear 4141 rotates integrally as part of the front segment 41A, and the rear segment gear 4151 rotates integrally as part of the rear segment 41B.

As described above, the driving force of the first driving source is transmitted to the gear 6 of the machine. On the other hand, the driving force of the second driving source Ma is transmitted to the front segment gear 4141. The rotational position relationship between the machine gear 6 and the front segment gear 4141 is set to a predetermined relationship by the control unit provided in the printing machine at the start of normal operation.

Further, a front segment interlocking member 4143 is provided inside the front segment gear 4141 as a part of the front segment 41A. During normal operation, the driving force is transmitted from the second drive source Ma via the drive gear 4142 and the front segment gear 4141.

An elongated hole 511A provided so as to extend in the circumferential direction is formed on the axial end surface of the front segment interlocking member 4143 as a part of the first avoidance means 51 (see FIGS. 7A and 7B). .. In the present embodiment, three elongated holes 511A are formed rotationally symmetrically with respect to the rotation center axis of the front segment interlocking member 4143. However, the number of elongated holes 511A formed is not limited to three. Further, a plurality of elongated holes 511A may be formed at positions having different diameters. As shown in FIG. 7A, the circumferential length of the elongated hole 511A is not delayed with respect to the phase of the inverted transfer cylinder 41 (particularly the front segment 41A) with respect to the machine side cylinder (sheet transport direction). As shown in FIG. 7B, the most lagging state allowed (corresponding to the case where the length is the maximum) from the position of the driving force transmission pin 512A corresponding to the front segment interlocking member 4143 of the machine gear 6 (corresponding to the case of the maximum length). The length corresponds to the position of the driving force transmission pin 512A in (corresponding to the case where the length in the transport direction of the sheet of paper is the minimum).

An elongated hole 511B provided so as to extend in the circumferential direction is also formed on the axial end surface of the rear segment gear 4151 as a part of the first avoidance means 51. In this embodiment, two elongated holes 511B are formed so as to face the rotation center axis of the rear segment gear 4151. However, the number of elongated holes 511B formed is not limited to two. Further, a plurality of elongated holes 511B may be formed at positions having different diameters. The circumferential length of the slot 511B is not advanced (when the length in the transport direction of the sheet paper is the maximum) with respect to the phase of the rear segment 41B with respect to the side body of the machine, as shown in FIG. 7 (C). From the position of the driving force transmission pin 512B corresponding to the rear segment gear 4151 of the machine gear 6 in (corresponding), as shown in FIG. The length corresponds to the position of the driving force transmission pin 512B in (corresponding to the case where is the minimum).

Here, the setting of the circumferential dimension of the elongated holes 511A and 511B will be described with reference to FIG. 7. Although each of FIGS. 7 (A) to 7 (G) is a view when the outside is viewed from the inside, for convenience of explanation, the portion hidden on the back side is also displayed as a solid line (particularly, the figure). 7 (E) to (G)).

FIG. 7A shows the relationship between the driving force transmission pin 512A of the machine gear 6 and the front segment interlocking member 4143, and corresponds to the maximum size of sheet paper (maximum paper) on which the reversing transfer cylinder 41 can be printed. That is, the phase of the inverted transfer cylinder 41 is not delayed with respect to the phase of the side cylinder of the machine. FIG. 7B shows the relationship between the driving force transmission pin 512A of the machine gear 6 and the front segment interlocking member 4143, and corresponds to the smallest size sheet paper (minimum paper) on which the reversing transfer cylinder 41 can be printed. That is, the phase of the front segment interlocking member 4143 is the most delayed with respect to the phase of the side body of the machine.

FIG. 7C shows the relationship between the driving force transmission pin 512B of the machine gear and the rear segment gear 4151, and the case where the reverse transfer cylinder 41 is set corresponding to the maximum paper, that is, the rear segment gear. It shows a state in which the phase of 4151 does not advance with respect to the phase of the side body of the machine. FIG. 7D shows the relationship between the driving force transmission pin 512B of the machine gear and the rear segment gear 4151, and the case where the reverse transfer cylinder 41 is set corresponding to the minimum paper, that is, the rear segment gear. The phase of 4151 is the most advanced state with respect to the phase of the side body of the machine.

FIG. 7 (E) shows the states of FIGS. 7 (A) and 7 (C) in an overlapping manner. When the sheet paper is the maximum paper, the front segment 41A has no delay and the rear segment 41B has no advance with respect to the phase of the side cylinder of the machine, so this state is obtained. Further, FIG. 7 (F) shows the states of FIGS. 7 (A) and 7 (D) in an overlapping manner. When the sheet paper is the smallest paper, the front segment 41A has the maximum delay and the rear segment 41B has the maximum advance, so this state is obtained.

By the way, FIG. 7 (G) shows the states of FIGS. 7 (B) and 7 (C) in an overlapping manner, and the relationship between the front segment 41A and the rear segment 41B with respect to the gear 6 of the machine is shown in FIG. 7 (G). There is a possibility of changing from the state of F) to this state.

In this way, if the circumferential dimensions of the elongated holes 511A and 511B are set so as to take each of the states shown in FIGS. 7 (E) to 7 (G), it is possible to handle from the maximum paper to the minimum paper. The first avoidance means 51 can be realized.

In the present embodiment, as shown in FIGS. 7 (E) to 7 (G), the elongated hole 511B of the rear segment gear 4151 is formed at a larger diameter position than the elongated hole 511A of the front segment interlocking member 4143 and is larger. Although it is formed so as to have a radius of curvature, it is not particularly limited, and it is also possible to form it at the same diameter position or a small diameter position.

As shown in FIG. 6, the machine gear 6 is located between the front segment interlocking member 4143 belonging to the front segment 41A and the rear segment gear 4151 belonging to the rear segment 41B. Driving force transmission pins 512A and 512B project from the inner and outer end surfaces of the machine gear 6 as a part of the first avoidance means 51. Three driving force transmission pins 512A project from the inner end surface of the machine gear 6, and a part of these driving force transmission pins 512A is located in an elongated hole 511A formed in the front segment interlocking member 4143. On the other hand, two driving force transmission pins 512B project from the outer end surface of the machine gear 6, and a part of these driving force transmission pins 512B is located in an elongated hole 511B formed in the rear segment gear 4151. ..

Therefore, both the driving force transmission pin 512A located in the elongated hole 511A formed in the front segment interlocking member 4143 and the driving force transmission pin 512B located in the elongated hole 511B formed in the rear segment interlocking member are both elongated hole ends. When it is not in the portion (the tip portion in the rotation direction of the machine gear 6), since the machine gear 6 is in a free state, only the machine gear 6 can rotate.

On the other hand, either the driving force transmission pin 512A located in the elongated hole 511A formed in the front segment interlocking member 4143 or the driving force transmission pin 512B located in the elongated hole 511B formed in the rear segment interlocking member is an elongated hole. When it is at the end (the tip in the rotation direction of the gear 6 of the machine), the driving force transmission pins 512A and 512B abut on the end of the slotted hole. 41 rotates together with the machine gear 6.

Therefore, the positional deviation (that is, the phase deviation) between the machine gear 6 and the front segment 41A and the machine gear 6 and the rear segment 41B in the circumferential direction is regulated within the formation range of the elongated holes 511A and 511B. It is prevented that the range is exceeded. Therefore, it is possible to prevent a large deviation exceeding the above-mentioned regulation, which causes a collision between a part of the body.

As described above, the circumferential lengths of the elongated holes 511A and 511B correspond to the transport direction lengths of the sheet paper. For this reason, the collision avoidance means 5 of the present embodiment has a length in the transport direction of the sheet (specifically, from the maximum length to the minimum length of the sheet that can be printed by the printing press of the present embodiment). It operates in the circumferential range corresponding to.

As described above, the collision avoiding means 5 of the present embodiment receives the driving force from the first driving source and transmits the driving force to the reversing transfer cylinder 41 as the first avoiding means 51 when the second driving source Ma fails. This is a displacement means provided over the machine gear 6 and the reversing transfer cylinder 41, and allows a deviation within a predetermined range in the circumferential direction between the machine gear 6 and the reversing transfer cylinder 41. Moreover, the combination of the elongated holes 511A and 511B and the driving force transmission pins 512A and 512B as a deviation means for regulating the deviation exceeding the predetermined range is provided.

Next, the second avoidance means 52 will be described. The cam portion 521, which is a part of the second avoidance means 52, is supported by the frame of the printing machine, so that the cam portion 521 is immobile without being interlocked with each of the processing cylinder 22, the reversing cylinder 42, and the reversing transfer cylinder 41. It is a portion that is arranged so as to face the gear 6 and the front segment interlocking member 4143 (that is, in parallel with the axial direction of the reversing transfer cylinder 41) and is shown by hatching in FIGS. 8 and 9. The shape is such that the radial position of the side surface changes.

Further, the link portion 522, which is a part of the second avoidance means 52, has one end of the three driving force transmission pins 512A corresponding to the front segment interlocking member 4143, while the other end is the front segment interlocking member. Each of the 4143s has a cam follower 5223 rotatably provided and moves along the side surface of the cam portion 521 while abutting against the cam follower 5223.

As shown in FIGS. 7 (A) and 7 (B), the link portion 522 includes the one end side member 5221 and the other end side member 5222 as shown in FIGS. 7 (A) and 7 (B). Are rotatably connected to each other, and the linearly extending portions of the members 5221 and 5222 are formed so as to bend at two points. However, the members 5221 and 5222 are not limited to this shape, and may be formed in a curved shape that is curved with a constant curvature, for example.

The cam follower 5223 is a cylindrical body, and is provided on one end side member 5221 so as to project inward along the axial direction of the reversing transfer cylinder 41 (see FIG. 6). The cam follower 5223 moves along the cam portion 521 while the outer peripheral surface of the cam follower 5223 abuts on the side surface of the cam portion 521 as the gear 6 of the machine rotates (see FIGS. 8 and 9).

As shown in FIGS. 8 and 9, the cam portion 521 is formed so that the radial dimension increases at the center in the circumferential direction. Due to this shape, the cam follower 5223 moves in the radial direction. With this radial movement, the circumferential distance between one end and the other end of the link portion 522 is extended and shortened.

Therefore, the link portion 522 corrects the inverted transfer cylinder 41 to a desired rotation position by performing an advancing / retreating operation of partially advancing or delaying the phase of the inverted transfer cylinder 41 in the circumferential direction via the front segment interlocking member 4143. can do.

By the second avoidance means 52, the advance / retreat operation is regarded at a specific position in the circumferential direction of the reversing transfer cylinder 41. In the present embodiment, the specific location is set at a location where the collision of "1-2" (collision between the gripper 22G of the processing cylinder 22 and the outer peripheral surface of the reversing transfer cylinder 41) may occur. ..

In the normal operation, since the reversing transfer cylinder 41 rotates with respect to the processing cylinder 22 and the reversing cylinder 42 with high accuracy, the cam portion 521 and the link portion 522 are operated, but the advance / retreat operation is performed. Will not be done. This is because the advancing / retreating operation is configured to operate in order to correct an excessive phase difference exceeding the range corresponding to the length of the sheet in the transport direction.

8 (A) to 8 (D) and 9 (E) to 9 (H) show changes in the positional relationship of the second avoidance means 52 in the normal rotation direction (rotation direction during normal operation) on the machine side. It is shown every 15 ° on the basis of the rotation angle. 8 (A) shows the angle of the inverted transfer cylinder 41 with respect to the processing cylinder 22 at 0 °, FIG. 8 (B) shows 15 °, FIG. 8 (C) shows 30 °, FIG. 8 (D) shows 45 °, and FIG. E) shows 60 °, FIG. 8 (F) shows 75 °, FIG. 8 (G) shows 90 °, and FIG. 8 (H) shows 105 °.

The angle shown in each figure shows the rotation angle of the reversing transfer cylinder 41 (front segment interlocking member 4143), where the angle of the gripper 41G in FIG. 8 (A) is 0 °. As described in each figure, it can be seen that the rotation angle of the reversing transfer cylinder 41 does not change in increments of 15 °. This is because, as described above, the link portion 522 performs the advance / retreat operation of the reversing transfer cylinder 41.

As described above, the printing machine of the present embodiment includes the collision avoiding means 5 (first avoiding means 51, second avoiding means 52) having the above-described configuration, so that the phase of the reversing transfer cylinder 41 advances from the phase of the side cylinder of the machine. That is regulated by the first avoidance means 51. Further, the phase of the reversing transfer cylinder 41 lagging behind the phase of the cylinder on the side of the machine is restricted by the second avoidance means 52 only in the range where the gripper interferes. As a result, the collision of "1-1" (collision between the gripper 41G of the reversing transfer cylinder 41 and the outer peripheral surface of the processing cylinder 22) and the collision of the "1-2" (reversal with the gripper 22G of the processing cylinder 22). (Collision with the outer peripheral surface of the transfer cylinder 41) is avoided.

Then, in the collision of "2-1" (collision between the gripper 42G of the reversing cylinder 42 and the rear segment 41B of the reversing cylinder 41), the phase of the paper tail portion (that is, the rear segment 41B) of the reversing cylinder 41 is the main phase. This situation is regulated by the first avoidance means 51, which is caused by lagging behind the phase of the fuselage side body. Further, in the collision of "2-2" (collision between the front segment 41A of the reversing cylinder 41 and the gripper 42G of the reversing cylinder 42), the phase of the paper head portion (that is, the front segment 41A) of the reversing cylinder 41 is the same. It occurs by advancing from the phase of the fuselage side body, but such a situation is also regulated by the first avoidance means 51.

In this way, the first avoidance means 51 composed of the elongated holes 511A and 511B and the driving force transmission pins 512A and 512B and the second avoidance means 52 composed of the cam portion 521 and the link portion 522 cooperate with each other. As a result, the collisions listed in "1-1" to "2-2" are effectively avoided.

The collision avoidance means 5 transmits the driving force of the first drive source to rotate the reverse transfer cylinder 41, but the rotation of the reverse transfer cylinder 41 by the first drive source is exclusively for collision avoidance. However, it cannot be rotated with high precision so that normal printing can be continued. Therefore, the operation of the collision avoidance means 5 (meaning the operation of performing the collision avoidance function) is performed by the control unit of the printing machine at least on the side body of the machine (particularly the processing body 22 and the processing body 22) after the second drive source Ma fails. This is done for a limited period of time until the reverse transfer cylinder 41) and the reverse transfer cylinder 41 are stopped. In other words, the collision avoidance means 5 rotationally drives the reversing transfer cylinder 41 by the second drive source Ma by the first drive source so as to trace the rotational drive of the reversing transfer cylinder 41 by the second drive source Ma to a extent that collision can be avoided although the accuracy is low.

Further, during normal operation, both the driving force transmission pin 512A located in the elongated hole 511A formed in the front segment interlocking member 4143 and the driving force transmission pin 512B located in the elongated hole 511B formed in the rear segment gear 4151. Is not at the end of the slotted hole (the tip of the gear 6 in the rotation direction). Therefore, since the machine gear 6 is in a free state with respect to the front segment interlocking member 4143 and the rear segment gear 4151, the collision avoidance means 5 does not operate. The collision avoiding means 5 is formed on the front segment interlocking member 4143 because the driving force of the first driving source is superior due to the disappearance or reduction of the driving force of the second driving source Ma in the event of a failure of the second driving source Ma. Either the driving force transmission pin 512A located in the slotted hole 511A or the driving force transmission pin 512B located in the slotted hole 511B formed in the rear segment gear 4151 is the slotted hole end (rotation of the machine gear 6). It operates by being located at the tip (tip in the direction). As described above, the collision avoiding means 5 of the present embodiment is in a so-called "operation standby state" during normal operation.

By adopting the configuration of the present embodiment, a collision avoidance means that operates on the condition that a failure of the second drive source Ma is detected can be configured, or the driving force of the first drive source can be transmitted to the reversing transfer cylinder 41. Since it is not necessary to provide a means (clutch or the like) for connecting and disconnecting the printing machine, there is an advantage that the configuration of the printing machine can be simplified.

Further, in the present embodiment, since the collision avoidance means 5 can be mechanically configured, the cause of failure of the collision avoidance means 5 itself is limited to wear or damage of the constituent members, as compared with the configuration in which the collision avoidance means is electrically controlled. Therefore, the possibility of failure can be reduced and a highly reliable printing machine can be realized.

The printing machine according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

The concept of sheet-fed paper in the present invention also includes a sheet-like body made of a material other than paper in a narrow sense, such as a resin sheet.

Further, the configuration of the plurality of bodies is not limited to the configuration of the above-described embodiment, and various changes can be made. Further, the reversing-related cylinder specified in the claim is the reversing transfer cylinder 41 in the above embodiment, but it is particularly limited as long as it is a cylinder whose phase can be changed according to the length of the sheet in the transport direction. However, it may be another body of the reversing mechanism 4, such as a reversing body 42.

Further, in the inverted transfer cylinder 41 of the above embodiment, the fixed segment is the front segment 41A and the rotating segment is the rear segment 41B, but conversely, the rotating segment is the front segment 41A and the fixed segment is the rear segment 41B. It may be segment 41B.

Further, as the first avoidance means 51, in the above-described embodiment, the combination of the elongated holes 511A and 511B and the driving force transmission pins 512A and 512B has been described, but this is only an example, and the driving force transmission member (the above-described embodiment). Then, the specific form can be changed in various ways as long as it corresponds to the displacement means that allows the displacement of a predetermined range in the circumferential direction between the machine gear 6) and the reversing transfer cylinder 41. For example, it may be a combination of a rail installed in the circumferential direction at the axial end of the reversing cylinder and a moving portion capable of moving along the rail in a predetermined range in the circumferential direction.

Further, in the above-described embodiment, the elongated holes 511A and 511B are formed at the axial end portions of the front segment interlocking member 4143 and the rear segment gear 4151, respectively. However, the present invention is not limited to this, and for example, by using a member other than a gear, an elongated hole can be formed on the outer peripheral surface of the member. As described above, the first avoidance means 51 may be, for example, a circumferential path provided along the circumferential direction and a moving means for moving in a predetermined range in the circumferential direction along the circumferential path, and the form is not limited. ..

Further, in order to alleviate the impact when the driving force transmission pins 512A and 512B hit the ends of the elongated holes 511A and 511B, either the side of the machine gear 6 or the side of the front segment 41A or the rear segment 41B, or A shock absorbing part can be provided on both sides. For example, a shock absorbing portion can be provided on the inner surface of the end portion of the elongated holes 511A and 511B and on the outer peripheral portion of the driving force transmission pins 512A and 512B.

Further, as the second avoidance means, the combination of the cam portion 521 and the link portion 522 has been described in the above embodiment, but this is only an example, and the driving force transmission member (the gear 6 of the present machine in the above embodiment) The specific form can be changed in various ways as long as it corresponds to the means for locally aligning with the inverted transfer cylinder 41 in the circumferential direction. For example, a groove or an elongated hole that is curved so as to correspond to the side shape of the cam is formed in the immovably provided member, and a moving portion that moves along the groove or the elongated hole on the side of the reversing transfer cylinder 41. The same function as that of the above-described embodiment can be realized by providing.

Further, in the above-described embodiment, the driving force transmission pins 512A and 512B are provided on the machine side, and the elongated holes 511A and 511B are provided on the reversing transfer body side, but conversely, the elongated holes are provided on the machine side. A driving force transmission pin may be provided on the reversing body side.

Further, in the above-described embodiment, the cam follower 5223 is configured to move in the radial direction, but a member corresponding to the cam follower 5223 may be configured to move in the axial direction of the reversing transfer cylinder 41.

Further, although all the collision avoidance means 5 are mechanically configured in the above-described embodiment, it is also possible to electrically configure a part of the collision avoidance means 5 and perform collision avoidance by electrical control. Further, a hydraulic mechanism can be used as a part of the collision avoidance means 5.

1 ... Paper feed unit, 2 ... Printing unit, 3 ... Paper ejection unit, 4 ... Reversing mechanism, 5 ... Collision avoiding means, 6 ... Driving force transmission member (gear of this machine), 22 ... Side body of this machine (processing cylinder) , 41 ... Reversing-related body (reversing transfer body), 41A ... Front segment, 41B ... Rear segment, 41G ... Sheet paper holding part (gripper), 42 ... Machine side body (reversing body), 51 ... Displacement means (No. 1) 1 avoidance means), 52 ... second avoidance means, 511A ... long hole, 511B ... long hole, 512A ... driving force transmission pin, 512B ... driving force transmission pin, 521 ... cam part, 522 ... link part, 5223 ... cam follower, Ma ... Second drive source (servo motor)

Claims (4)

In a printing machine capable of double-sided printing on sheet paper
A reversing-related body that is a part of the reversing mechanism for reversing the front and back of the sheet, and has a sheet holding part that grips the edge of the sheet so as to protrude from the outer peripheral surface.
A plurality of machine side cylinders different from the inversion-related cylinders provided in the printing machine,
A first drive source for rotationally driving the plurality of side cylinders of the machine, and
A second drive source, which is provided separately from the first drive source and rotationally drives the inversion-related body,
In the event of a failure of the second drive source, a part of the reversal-related cylinder and a plurality of the reversal-related cylinders are rotated by transmitting a driving force from the first drive source to the reversal-related cylinder to rotate the reversal-related cylinder. A collision avoidance means that avoids a collision with a part of the machine side body adjacent to the inversion-related body of the machine side body and operates within a range corresponding to the length of the sheet in the transport direction. A printing machine characterized by being provided with. The reversing-related cylinder is one of the plurality of machine side cylinders by holding the paper head of the sheet paper conveyed by the processing cylinder which is one of the plurality of machine side cylinders by the sheet paper holding portion. The printing machine according to claim 1, wherein the reversing cylinder is a reversing cylinder that delivers the sheet to the reversing cylinder with the paper tail of the sheet as the head. During normal operation in which the reversing transfer cylinder is rotationally driven by the second drive source, the reversing cylinder is driven so as to have a variable rotational speed according to the length of the sheet in the transport direction.
The collision avoiding means includes a driving force transmitting member that receives a driving force from the first driving source and rotates so as to transmit the driving force to the reversing transfer cylinder when the second driving source fails. A displacement means provided over the reversing transfer cylinder, which allows a deviation of a predetermined range in the circumferential direction between the driving force transmitting member and the reversing transfer cylinder, and exceeds the predetermined range. The printing machine according to claim 2 , further comprising a deviation means for regulating deviation. The inverted transfer cylinder includes at least one pair of a front segment located in front of the rotation direction and a rear segment located in the rear of the rotation direction during normal operation.
One of the front segment and the rear segment is rotatable with respect to the other with respect to the central axis of the inverted transfer cylinder, and is adjusted to the circumferential dimension corresponding to the transport direction length of the sheet of paper. Can be repositioned to each other and can be fixed in that state,
The collision avoidance means
At the axial end of each of the front segment and the rear segment, an elongated hole provided so as to extend in the circumferential direction,
A driving force transmission pin, which is partially located inside the elongated hole and rotates integrally with the driving force transmitting member to transmit the driving force of the first driving source to the reversing transfer cylinder.
The processing cylinder, the reversing cylinder, and the reversing transfer cylinder are not interlocked with each other and are immovably arranged so as to face the axial end portion of the driving force transmission member and the reversing transfer cylinder, and are arranged on the side surface. A cam part with a shape that changes its radial position,
A cam follower that is rotatably provided at one end with respect to the driving force transmission pin and the other end with respect to the axial end portion of the reversing transfer cylinder and moves while abutting along the side surface of the cam portion. The printing machine according to claim 3 , further comprising a link portion having the link portion.

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