JPH0696287B2 - Printing plate mounting device for printing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a printing plate mounting apparatus of a printing machine capable of automatically mounting a printing plate on a printing cylinder.

"Prior Art" Generally, a printing machine is configured to transfer ink from an inking device to a printing plate on a printing cylinder and also to perform printing by feeding paper between a printing cylinder and a press roll. . Then, in order to mount the printing plate on the printing cylinder, first, as shown in FIG. 7, one of the locking bars 1a of the printing plate 1 is locked to the locking portion 3 of the printing cylinder 2 to fix the printing plate 1. After fitting the other latch bar 1b into the groove 5 of the printing plate mounting shaft 4,
The printing plate mounting shaft 4 is rotated in the cylindrical body 6 to stretch the printing plate 1 on the peripheral surface of the printing cylinder 2. Conventionally, such a printing plate 1
When mounting the plate, one worker presses the central portion of the printing plate 1 by hand while another worker puts a spanner on the end of the printing plate mounting shaft 4 and rotates the printing plate mounting shaft 4. For this reason, it is not possible for one person to do it at all, and it is the current situation that two or more workers use a tool such as a spanner to do the work manually each time. There was a drawback that the work efficiency was extremely poor due to the complicated mounting and demounting work as well as the mounting work.

In recent years, in order to eliminate this, the actual development No. 59-38043 and the actual development No.
Devices such as 59-90445 have been proposed. In the device of Japanese Utility Model Laid-Open No. 59-38043, a pinion is provided at one end of the printing plate mounting shaft 4, a gear meshing with the pinion is rotatably supported on the outer periphery of the end of the printing cylinder, and a boss of the gear is provided. A braking device is interposed between the brake shoes on the peripheral surface so as to be freely press-contacted. However, usually, various sensors such as position detection for positioning the printing cylinder with respect to the sheet to be printed are arranged around the end side of the printing cylinder. Can not be installed as it is, and even if the above device is installed in a new printing machine, it is necessary to secure a dedicated space around the end of the printing cylinder, which is a troublesome point in production. I couldn't avoid getting bigger.

On the other hand, in the device of Japanese Utility Model Publication No. Sho 59-90445, a rotary air actuator is connected to the plate mounting shaft 4 and air is supplied to the rotary air actuator from outside the printing cylinder through the rotary air joint and the shaft of the printing cylinder. It is supplied so that the printing plate mounting shaft 4 is rotated. However, in this apparatus as well, not only the rotary air actuator but also the gear group that connects the rotary air actuator and the printing plate mounting shaft 4 is arranged laterally to the end of the printing cylinder. Similar to the above, not only must a dedicated space be secured, but another dedicated power source is also required, which results in a large scale, which not only increases the cost but also increases the size of the entire device. was there.

[Problems to be Solved by the Invention] In view of the above circumstances, the present invention allows a single worker to mount a printing plate, and moreover, provides a dedicated space around the end of the printing cylinder. An object of the present invention is to provide a printing plate mounting apparatus for a printing press that does not need to be secured and does not need to use a large power source or mechanism.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present invention provides a rotatable printing plate mounting shaft (2) which is locked at an outer peripheral portion of a printing cylinder at one end of the printing plate.
In a printing plate mounting device of a printing machine, which comprises a 3) and a hooking portion to which the other end of the printing plate is locked, a braking shaft rotatably inserted and supported in the shaft of the printing cylinder ( 30)
A large-diameter gear (29) fixed to the inner end of the printing cylinder of the braking shaft, and the end of the printing cylinder that meshes with the large-diameter gear and is rotatable around the large-diameter gear. A pinion gear (28) rotatably supported on the flange, and a pinion gear (28) interposed between the pinion gear (28) and the plate mounting shaft gear (24) so that the pinion gear (28) is rotatably attached to the flange at the end of the printing cylinder. A plate mounting shaft transmission gear group (25, 26, 27) that is pivotally supported, and braking shaft rotation prevention means (39) that is provided at the other end of the braking shaft and that can prevent rotation of the braking shaft. , A differential gear mechanism (50) interposed between the driven gear (16) for the printing cylinder connected to the drive source and the shaft (35, 48) of the printing cylinder (11).
A driven gear which is connected to the differential gear mechanism motor (52) connected to the differential gear mechanism and the printing cylinder driven gear (16) and is capable of restricting rotation of the driven gear by a predetermined braking force. And a rotation braking means (22).

[Operation] Based on the above-mentioned configuration, the driven gear rotation braking means (22) is operated to restrict the rotation of the printing cylinder driven gear (16) by a braking force smaller than the resistance force due to the tension of the printing plate, and further braking. The shaft for braking (30) is activated by activating the shaft rotation prevention means (39).
Rotation of the differential gear mechanism motor (5
2) Drive the printing cylinder shaft (35,48)
And the printing cylinder (11) rotates, and the pinion gear (28)
Rotates around a large-diameter gear (29), and the printing plate mounting shaft transmission gear group (25, 26, 27) and the printing plate mounting shaft (23) also rotate to stretch the printing plate on the printing cylinder. . Then, when the printing plate is stretched on the printing cylinder, the shaft of the printing cylinder and the printing cylinder are prevented from rotating, and the driven gear for the printing cylinder controls the driven gear rotation braking means to have a force smaller than the resistance force due to the stretching of the printing plate. Rotates against power.

As a result, after the printing plate is stretched on the printing cylinder, the driven gear (16) for the printing cylinder rotates against the braking force smaller than the resistance force due to the stretching of the printing plate of the driven gear rotation braking means (22). It is possible to prevent burning of the differential gear mechanism motor (52) due to overload and damage of the printing plate due to excessive force.

The reference numerals in parentheses refer to the drawings and do not limit the configuration in any way.

[Embodiment] An embodiment of a printing plate mounting method for a printing press according to the present invention will be described below with reference to the drawings. The embodiment shown in the drawings is carried out on a processing machine for performing ruled line processing in addition to printing on a corrugated board sheet. First, an apparatus for carrying out the above method will be described.

FIG. 1 shows a main part of a printing machine A that prints on a corrugated cardboard sheet, and the printing machine A can be detached from other devices for maintenance and inspection. In FIG. 1, 11 is a printing cylinder. , 12 are press rolls, 13 and 14 are feed rolls, and 15 is a main driving gear of a drive source. The main driving gear 15 is provided in another device B connected to the printing machine A, and when the printing machine A is connected to the other device B, the main driving gear 15 meshes with the driven gear 16 attached to the shaft of the printing cylinder 11. It has become. The driven gear 16 meshes with the driven gear 17 provided on the shaft of the press roll 12 to rotate the press roll 12, and also meshes with the driven gear 19 via the idle gear 18, thereby rotating the feed roll 13. Has become. The driven gear 19 is the other feed roll 14
Meshes with the driven gear 20 on the shaft of the. That is, in the printing press A, when the main driving gear 15 rotates, not only the printing cylinder 11 and the press roll 12 rotate by meshing with the driven gears 16 and 17, but also the driven gear 16 to the idle gear 18 and the driven gear. Each feed roll through 19, 20
13 and 14 are also designed to rotate. A printing plate mounting device 21 is attached to the printing cylinder 11, and a protective braking device 22 for applying the braking force is provided on the feed roll 13.

The printing plate mounting device 21 is configured as shown in FIGS. That is, first, the printing plate mounting shaft 23 is provided on the outer peripheral portion of the printing cylinder 11 along the axial direction thereof, as is well known. The present invention, at one end of the printing cylinder 11,
The gear 24 is provided so as to be located close to the end surface of the printing cylinder 11. The gear 24 may have a substantially half-moon shape in which teeth having an angle corresponding to the maximum rotation angle required by the printing plate mounting shaft 23 are formed and the other peripheral surface is notched. A large-diameter gear 29 of the braking shaft 30 is meshed with the gear 24 via gears 25 to 28. Further, the gear 24 freely rotates without being locked by the rotation of the printing plate mounting shaft 23 in the printing plate winding direction, and is locked by the rotation of the printing plate mounting shaft 23 in the opposite direction. It is detachable with the ratchet claw 71 that prevents The ratchet pawl 71 abuts on a stopper 72 for locking the gear 24, and is also rotatable so that the locking can be released from the gear 24 by a lever (not shown). The gears 24 to 29 are the above braking force transmission mechanism 31.
There is. The gear 25 is rotatably supported on the end surface of the printing cylinder 11. The gear 26 has a shaft hole 33 provided in a flange 32 at the end of the printing cylinder 11, and is provided at one end of a shaft 34 rotatably inserted in the shaft hole 33. Axis 34
The other end of is optionally provided within the print cylinder 11 with a gear 27. The pinion gear 28 is rotatably supported by a flange 32, is arranged in the printing cylinder 11, and meshes with a large-diameter gear 29. A large diameter gear 29 is fixedly installed in one end of the braking shaft 30 in the printing cylinder 11.

Further, the braking shaft 30 has an insertion hole 36 provided at the axial center position of the shaft 35 on one side, and is rotatably fitted in the insertion hole 36 with a bearing 36a. The shaft 35 is
Of course, the frame 37 is rotatably supported by the bearing 38. Then, with the rotation of the braking shaft 30 and the large-diameter gear 29 blocked, the shaft 35 and the printing cylinder 11
When is rotated, the pinion gear 28 rotates around the large-diameter gear 29 while meshing with the large-diameter gear 29, and the gears 27, 26, 25, 2
The plate mounting shaft 23 is adapted to rotate via 4.

Further, the other end of the braking shaft 30 is provided with a braking mechanism 39 by further projecting outward from the end of the shaft 35. Braking mechanism 39
Is applicable to various things such as handbrake,
In the embodiment shown in the drawings, the pinion 40 is attached to the other end of the braking shaft 30.
Is fixedly provided, and the claw teeth 41 are provided on the pinion 40 so as to be able to mesh with each other. The claw teeth 41 are fixed to the lower end of a swing arm 42 that swings with one end as a fulcrum. The swing arm 42 is
One end is supported by the mounting plate 43, and the other end is pivotally attached to the piston rod 45 of the air cylinder 44. Air cylinder 44
Is pivotally supported on the bracket 46. Bracket 46
Are fixed to the mounting plate 43. Also, the mounting plate 43
Are attached to the frame 37 via a suitable number of columns 47.

On the other hand, as shown in FIG. 5, the other end of the printing plate mounting shaft 23 is projected by a predetermined length from the end surface of the printing cylinder 11 so that it can be manually rotated, and the projected portion 73 is a tool such as a spanner. It has a shape that can be locked. Further, the shaft 48 at the other end of the printing cylinder 11 is rotatably supported by the frame 37 by the bearing 37a and extends further outward from the frame 37 so that the driven gear 16 with which the main driving gear 15 meshes can be received by the bearing 49.
Is provided so as to be rotatable, and the output end of the differential device 50 is connected. The differential device 50 is a driven gear.
It is fixed to 16 and when the main driving gear 15 rotates, the driven gear 1
6, and rotating the shaft 48 via the differential 50 is similar to that known. A differential motor 52 as a power source for mounting the printing plate is connected to the input end of the differential device 50 via a gear group 51, and the rotation angle of the printing cylinder 11 is detected via the gear group 53. The rotary encoder 54 is also mounted on the mounting plate 55. The mounting plate 55 includes
If the thrust moving device 56 is provided and the handle 57 is turned, the position of the printing plate with respect to the corrugated cardboard sheet to be printed by moving not only the differential device 50 and the main driving gear 15 but also the printing cylinder 11 itself in the axial direction. Can be adjusted. The mounting plate 55 is fixed to the frame 37.

Further, the press roll 12 in which the driven gear 17 meshes with the driven gear 17 and rotates, if a handle (not shown) is rotated,
The handle shaft 58 rotates, and further, the eccentric metal 60 rotates via the gear group 59. Since the eccentric metal 60 is eccentrically supported with respect to the rotation center of the eccentric metal 60, the print cylinder 11 is supported. It goes without saying that the gap length can be adjusted according to the thickness of the corrugated cardboard sheet to be printed by moving it so as to be able to move toward and away from it.

One of the feed rolls 13 is a driven gear as shown in FIG.
The driven gear 19 is meshed with the idle gear 16 via the idle gear 18 so as to be rotatable.
have. An air cylinder 64 is provided on the frame 37 via a bracket 63. The air cylinder 64 has a brake lining 66, which is in pressure contact with the brake cylinder 62, at the tip of the piston rod 65. The pressure contact force of the brake lining 66 with respect to the brake cylinder 62, and thus the frictional force, is reduced by the completion of the mounting of the printing plate 1 on the printing cylinder 11.
Is set to a value smaller than the rotational force of the printing cylinder 11 that would be damaged by the drive of the differential motor 52. Brake trunk 62, air cylinder 64 and brake lining
66 constitutes the protective braking device 22. Further, the brake lining 66 is sandwiched by a bifurcated guide member 70 so that vertical movement and pressure contact operation with respect to the brake cylinder 62 are guided and held.

Further, it goes without saying that the other feed roll 14 rotates following the rotation of the feed roll 13 by meshing between the driven gears 19 and 20. When the handle (not shown) is rotated, the feed roll 14 rotates the handle shaft 67, and further rotates the eccentric metal 69 via the gear group 68 to support the eccentric metal 69 in an eccentric center. Therefore, the gap length can be adjusted in accordance with the thickness of the corrugated cardboard sheet to be printed by moving the feed roll 13 in the contact / separation direction.

Next, the operation of the printing plate mounting apparatus for the printing machine will be described.
First, when the printing plate 1 is mounted on the printing cylinder 11 of the printing press A, the printing press A is separated from the other device B. Simultaneously with this separation, the air cylinder 64 is operated by a command from a control panel (not shown), the brake lining 66 is brought into pressure contact with the brake cylinder 62, and the feed roll 13 is fixed by its pressure contact force, that is, friction force. Therefore, since the driven gear 19 meshes with the driven gear 16 via the idle gear 18 as described above, when the differential motor 52 is driven, the driven gear 16 does not rotate and only the printing cylinder 11 is driven. Through the differential device 50 and the shaft 48, the printing plate 1 can be rotated to a position where it can be easily mounted. Then, as before, the latch bar 1a of the printing plate 1 is used as the latch portion of the printing cylinder 11, and the other latch bar is used.
1b is locked to the plate mounting shaft 23, and the drive of the differential motor 52 is stopped.

Then, the air cylinder 44 of the braking mechanism 39 according to the present invention.
When is driven, the swing arm 42 swings downward,
Since the claw teeth 41 of the swing arm 42 mesh and lock with the pinion 40, the braking shaft 30 and the large-diameter gear 29 are non-rotatably locked. In this state, if the differential motor 52 is driven again to rotate the printing cylinder 11 via the differential device 50, the pinion gear 28 meshes with the large-diameter gear 29 while the large-diameter gear 29 moves. It rotates around and the printing plate mounting shaft 23 rotates via the gears 27, 26, 25 and 24, the printing plate 1 is wound around the printing plate mounting shaft 23 and stretched around the peripheral surface of the printing cylinder 11. . Even after this tensioning, when the printing cylinder 11 is rotated by the differential motor 52, the resistance force due to the tensioning of the printing plate 1 causes the brake cylinder to rotate.
The frictional force of the brake lining 66 with respect to 62 becomes larger than the frictional force, and the brake cylinder 62 and the brake lining 66 slide, so that the rotational force of the differential motor 52 is not transmitted to the printing cylinder 11. , Driven gear 16, idle gear
Since the feed rolls 13 and 14 are rotated via the 18 and the driven gears 19 and 20, it is possible to prevent burnout due to overload of the differential motor 52 and damage to the printing plate 1 due to excessive force.

From the above, the operator usually uses a differential motor 52 for positioning with respect to the corrugated cardboard sheet to be printed.
Using a differential 50 driven by a printing cylinder
When the printing plate 1 is mounted on the printing plate 11, the rotation of the printing cylinder 11 is stopped, and conversely, the feed rolls 13 and 14 start to rotate. At this point, the drive of the differential motor 52 can be stopped. It is also possible to automatically stop the differential motor 52 by detecting the rotation of the feed rolls 13 and 14 when the printing plate 1 is completely attached to the printing cylinder 11 by a sensor provided separately. . When the printing plate 1 is completely attached to the printing cylinder 11, the ratchet pawl 71 and the gear 24 are locked to maintain the positional relationship between the printing plate mounting shaft 23 and the printing cylinder 11, that is, the printing cylinder 11 The tension of the printing plate 1 is maintained. After that, the engagement between the claw teeth 41 and the pinion 40 by the air cylinder 44 is released. Of course, during printing, the braking of the brake cylinder 62 by the brake lining 66 is also released.

Next, when detaching the printing plate 1 from the printing cylinder 11,
The brake lining 66 is brought into pressure contact with the brake cylinder 62, and the driven gear is passed through the feed roll 13 and the idle gear 18.
While fixing 16 and engaging the claw teeth 41 and the pinion 40, the differential motor 52 causes the printing cylinder 11 to rotate a little in the same direction as the direction in which the printing plate is mounted.
The engagement force between the ratchet pawl 71 and the ratchet pawl 71 is weakened, whereby the operator can easily disengage the ratchet pawl 71, then the drive of the differential motor 52 is stopped, and the pawl teeth 41 and the pinion 40 are disengaged. When the ratchet pawl 71 is disengaged, the printing plate mounting shaft 23 is reversed by the repulsive force due to the printing plate tensioning force, which loosens the tensioning of the printing plate 1 on the circumferential surface of the printing cylinder 11, and thereafter the operator. When the printing plate 1 is removed from the printing cylinder 11, the work is completed.

In addition, according to the present invention, when the printing plate 1 is mounted on the printing cylinder, the driven gear is observed from the differential motor 52 side.
When the rotation resistance force of 16 is larger than the rotation resistance force of the printing cylinder 11, the protective braking device 22 does not necessarily have to be provided. In this case, the printing cylinder
Completion of the mounting of the printing plate 1 on 11 can be detected by an operator visually observing the rotation stop of the printing cylinder 11 or by detecting an overload current to the differential motor 52. The driving of the motor 52 can be stopped.

[Advantages of the Invention] As described above, according to the printing plate mounting apparatus of the printing machine of the present invention, one worker can mount the printing plate on the printing cylinder, and moreover, the end portion of the printing cylinder can be mounted. Printing such as differential motors and differential devices for positioning the printing cylinder with respect to the existing printed matter without the need to secure a dedicated space around it and without using a large power source or mechanism. It is convenient because the device for rotating the cylinder can be used as it is, and it can be attached to the conventional machine as it is without requiring a great design change.

Further, when the printing plate is stretched over the printing cylinder, the shaft of the printing cylinder and the printing cylinder are prevented from rotating, and the driven gear for the printing cylinder rotates against the braking force smaller than the resistance force due to the stretching of the printing plate. As a result, it is possible to prevent the printing plate from being damaged due to excessive tension applied to it, and also to protect the differential gear mechanism motor from being overloaded and burned. You can

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a printing plate mounting apparatus of a printing machine according to the present invention, FIG. 2 is a front view of the essential parts showing the braking device of FIG. 1, and FIG. 3 is a braking force transmission mechanism. FIG. 4 is a side view of the main part of the braking device, FIG. 5 is a front view of the main part of the printing machine showing the differential motor and the differential device side, and FIG. 6 is the main part of the protective braking device. FIG. 7 is a front view and FIG. 7 is an explanatory view for explaining a state in which a printing plate is mounted on a printing cylinder, which has been conventionally performed. 11 …… Printing cylinder, 13 …… Feed roll 15 …… Main driving gear 16,17,19,20 …… Drive gear 18 …… Idle gear, 21 …… Plate mounting device 23 …… Plate mounting shaft, 24 ~ 29 …… Gear 30 …… Braking shaft, 31 …… Braking force transmission mechanism 32 …… Flange, 35 …… Shaft 37 …… Frame, 39 …… Braking mechanism 40 …… Pinion, 41 …… Claw teeth 42… … Swing arm, 44… Air cylinder

Claims (1)

[Claims] 1. An outer peripheral portion of a printing cylinder is provided with a rotatable printing plate mounting shaft (23) to which one end of the printing plate is locked, and a hooking part to which the other end of the printing plate is locked. In a printing plate mounting device of a printing machine, a braking shaft (30) rotatably inserted and supported in the shaft of the printing cylinder, and a large-diameter gear fixed to the inner end of the printing cylinder of the braking shaft. (29), a pinion gear (28) that meshes with the large-diameter gear, is rotatable about the large-diameter gear, and is rotatably supported by a flange at the end of the printing cylinder, and the pinion gear. A plate mounting shaft transmission gear group (25, 26, 27) that is interposed between (28) and the plate mounting shaft gear (24) and is rotatably supported by the flange at the end of the printing cylinder. A braking shaft rotation preventing means (39) provided at the other end of the braking shaft and capable of preventing rotation of the braking shaft, and a mark connected to a drive source. A differential gear mechanism (50) interposed between the driven gear (16) for the printing cylinder and the shafts (35, 48) of the printing cylinder (11), and a differential gear mechanism connected to the differential gear mechanism. Motors (52)
And a driven gear rotation braking means (22) connected to the driven gear for printing cylinder (16) and capable of restricting rotation of the driven gear by a predetermined braking force. Plate mounting device.