JPH0696288B2 - How to install a printing plate on a printing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for automatically mounting a printing plate on a printing cylinder, and in particular, the printing plate is damaged during automatic mounting, or a power source is used during automatic mounting. The present invention relates to a printing plate mounting method for a printing press, which can prevent a motor from being burnt out and protect it.

“Prior Art” Generally, in order to mount a printing plate on a 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. After the other latch bar 1b of the printing plate 1 is fitted into the groove 5 of the printing plate mounting shaft 4, the printing plate mounting shaft 4 is rotated in the cylinder 6 to print the printing plate 1 on the printing cylinder. It is stretched around the circumference of 2.

Conventionally, as a method of tensioning the printing plate 1 on the peripheral surface of the printing cylinder 2, the printing cylinder is fixed and the printing plate mounting shaft is rotated by a dedicated power source by a rotary actuator as in Japanese Utility Model Publication No. 59-90445. It is known that the method is performed by rotating the printing cylinder and the plate mounting shaft is fixed and the printing cylinder is rotated, as in Japanese Utility Model Laid-Open No. 59-38043.

However, in any of the methods, the operator visually confirms that the printing plate is stretched on the printing cylinder, and the drive of the motor for rotating the printing cylinder or the printing plate mounting shaft is stopped. The current situation. For this reason, even though the printing plate is stretched over the printing cylinder, the motor that is the power source for mounting the printing plate is often driven as it is, and as a result, the printing cylinder or There is a problem that the printing plate is cut by the rotational force of the printing plate mounting shaft, or the motor is overloaded and burned.

"Problems to be solved by the invention" In view of the above situation, the present invention drives a motor, which is a power source for printing plate mounting, to stretch the printing plate on a printing cylinder, and thereafter, the rotational force of the motor. Is transmitted as a rotational force of a roll other than the printing cylinder and the printing plate mounting shaft, thereby preventing the printing plate from being damaged by being applied with more tension than necessary, and the motor is not overloaded. An object of the present invention is to provide a printing plate mounting method for a printing press, which can protect from a situation such as a load being applied and burning.

"Means and Actions for Solving the Problem" In order to achieve the above-mentioned object, the present invention has a rotatable printing plate mounting shaft, one end of which is locked to the printing plate, on the outer peripheral portion of the printing cylinder,
A locking portion to which the other end of the printing plate is locked is provided, a large-diameter gear is provided so as to be rotatable around the axis of the printing cylinder, and a transmission gear group is provided to a pinion gear that meshes with the large-diameter gear. In the method of mounting a printing plate on a printing press, wherein a printing plate mounting shaft is connected via a differential gear mechanism between the printing cylinder shaft and the printing cylinder driven gear, the printing cylinder mounting gear is connected to the printing cylinder driven gear. The rolls other than the printing cylinder are applied with a braking force smaller than the resistance force due to the tension of the printing plate to regulate the rotation, and the rotation of the large diameter gear is blocked, and the differential gear mechanism By applying a driving force from a gear mechanism motor to rotate the printing cylinder, the pinion gear,
The transmission gear group and the printing plate mounting shaft are also rotated to stretch the printing plate on the printing cylinder, and after the printing plate is stretched, by the driving force described above,
A printing plate mounting method for a printing press is provided in which a driven gear for the printing cylinder and a roll other than the printing cylinder are rotated against a braking force smaller than a resistance force caused by tensioning the printing plate.

[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
It is designed to rotate 13 and 14. Printing cylinder above
A printing plate mounting device 21 is attached to 11 and the feed roll
The 13 is provided with a protective braking device 22 for applying the above braking force.

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 the stopper 72 so as to be locked with the gear 24, and is also rotatable so as to be unlocked from the gear 24 by a lever (not shown). The gears 24 to 29 serve as the braking force transmission mechanism 31. 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. The other end of the shaft 34 is provided with a gear 27 in the printing cylinder 11 as desired. The pinion gear 28 is rotatably supported by a flange 32, is arranged inside 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 a bearing 36a is rotatably fitted in the insertion hole 36. The shaft 35 is
Of course, the frame 37 is rotatably supported by the bearing 38. Then, when the shaft 35 and the printing cylinder 11 are rotated in a state where the rotation of the braking shaft 30 and the large diameter gear 29 is blocked, the pinion gear 28 meshes with the large diameter gear 29 and Rotate around and gear 27,26,25,24
The plate mounting shaft 23 is adapted to rotate via the.

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. Printing cylinder 11
The shaft 48 on the other side of the
A driven gear 16 rotatably supported by 7 and extended further outward from the frame 37 is rotatably provided by a bearing 49, and an output end of a differential device 50 is connected. It is supposed to be done. The differential device 50 is
When the main driving gear 15 is fixed to the driven gear 16 and rotates, the shaft 48 is rotated via the driven gear 16 and the differential device 50 in the same manner as well known. The differential motor 50 is connected to the input end of the differential device 50 via a gear group 51 as a power source for mounting the printing plate, and the rotation angle of the printing cylinder 11 is controlled via the gear group 53. The rotary encoder 54 for detection is connected. Not only the gear groups 51 and 53, but also the differential motor 52 and the rotary encoder 54 are mounted on the mounting plate 55. A thrust moving device 56 is provided on the mounting plate 55, and if a handle 57 is turned, a differential device 50 is provided.
The main driving gear 15 as well as the printing cylinder 11 itself can be moved in the axial direction to adjust the position of the printing plate with respect to the corrugated cardboard sheet to be printed. 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 due to the 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, and the eccentric metal 69 is supported on the eccentric metal 69. To feed the roll 13
On the other hand, the gap length can be adjusted according to the thickness of the corrugated cardboard sheet to be printed by moving 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. At the same time, in response to a command from a control panel (not shown), the air cylinder 64 operates, the brake lining 66 presses against the brake cylinder 62, and the feed roll 13 is fixed by the press 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 motor 11 tries to rotate the printing cylinder 11 by the differential motor 52, the tension of the printing plate 1 causes the resistance force to become larger than the friction force of the brake lining 66 against the brake cylinder 62. The brake cylinder 62 and the brake lining 66 slide, and as a result, the rotational force of the differential motor 52 is not transmitted to the printing cylinder 11, and the driven gear 16, the idle gear 18, and the driven gears 19, 20 are not transmitted. Since the feed rolls 13 and 14 are rotated via the shafts, 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 mounting of the printing plate 1 on the printing cylinder 11 is completed, 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, to 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, so that the operator can easily disengage the ratchet pawl 71, then the driving 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 due to the repulsive force due to the printing plate tensioning force, which loosens the tensioning of the printing plate 1 on the peripheral 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.

According to the present invention, when the printing plate 1 is mounted on the printing cylinder 11, when the rotational resistance force of the driven gear 16 is larger than the rotational resistance force of the printing cylinder 11 as observed from the differential motor 52 side. However, the protective braking device 22 is not necessarily provided. In this case, when the mounting of the printing plate 1 on the printing cylinder 11 is completed, the operator visually observes the rotation stop of the printing cylinder 11 or the differential motor 52.
Can be detected by detecting an overload current to the differential motor 52, and the drive of the differential motor 52 can be stopped at this point.

[Advantages of the Invention] As described above, according to the printing plate mounting method of the present invention, the braking force smaller than the resistance force due to the printing plate stretching on the rolls other than the printing cylinder connected to the driven gear for the printing cylinder. When the differential gear mechanism motor is driven in a state in which the rotation of the brake shaft is blocked and the rotation of the braking shaft is blocked, the shaft of the printing cylinder and the printing cylinder rotate, and the pinion gear moves to a large-diameter gear. When the printing plate is stretched around the printing cylinder by rotating around, the printing plate mounting shaft transmission gear group and the printing plate mounting shaft also rotate, and then the printing plate is stretched over the printing cylinder, the shaft of the printing cylinder and the The rotation of the printing cylinder is prevented, and the driven gear for the printing cylinder and the rolls other than the printing cylinder rotate against the braking force smaller than the resistance force due to the tensioning of the printing plate. Added Therefore, it is possible to prevent the printing plate from being damaged, and also to protect the differential gear mechanism motor from being burned due to overload.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part showing an embodiment of a printing machine for carrying out a printing plate mounting method for a printing machine according to the present invention, and FIG.
FIG. 3 is a side view of a braking force transmitting mechanism, FIG. 4 is a side view of a main portion of the braking device, and FIG. 5 is a differential motor and a differential device side. FIG. 6 is a front view of a main part of the printing machine, FIG. 6 is a front view of a main part of the protective braking device, 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 22 …… Protective braking device, 23… … Stamp plate mounting shaft 24 to 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 44,64 …… Air cylinder 62 …… Brake trunk 66 …… Brake lining

Claims (1)

[Claims] 1. A printing cylinder, comprising a rotatable printing plate mounting shaft 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. A large-diameter gear is rotatably provided around the shaft of the printing cylinder, the pinion gear that meshes with the large-diameter gear is connected to the printing plate mounting shaft through a transmission gear group, and the shaft of the printing cylinder and the driven cylinder for the printing cylinder are connected to each other. In a method of mounting a printing plate on a printing press in which a differential gear mechanism is interposed between the gear and the gear, a braking force smaller than the resistance force due to the printing plate stretching on a roll other than the printing cylinder connected to the driven gear for the printing cylinder is applied. In addition, by controlling the rotation and preventing the rotation of the large-diameter gear, the driving force from the differential gear mechanism motor is applied to the differential gear mechanism to rotate the printing cylinder. , Also rotate the pinion gear, transmission gear group, and plate mounting shaft. A printing plate is stretched on a printing cylinder, and after the printing plate is stretched, the driven force for the printing cylinder and the printing are resisted by the driving force against a braking force smaller than the resistance force due to the stretching of the printing plate. A printing plate mounting method for a printing press, characterized in that a roll other than a cylinder is rotated.