JPH0489738A - Pusher variable speed change system for metal plate printing machine - Google Patents

Abstract

PURPOSE:To periodically accelerate and decelerate a pusher head by connecting a pusher driving shaft to a sun gear on the prime mover side through a driven gear mounted on the epicyclic gear of an epicyclic gear device. CONSTITUTION:An internal gear 13a to be geared with an epicyclic gear 12 is cut on the inner housing 13 internal circumference of an epicyclic gear device, and a sun gear 11 and the housing 13 are relatively rotatable through the epicyclic gear 12. A driven gear 4 is mounted on the support shaft 12a of the epicyclic gear 12 and rotated synchronously with the internal gear 13a. The housing 13 rotatably supported by a driving shaft 2 is moved following the movement of a cam 3 through an arm 16. Thus, the housing 13 is rested and normally/ reversely rotated even when the driving shaft 2 is rotated at a fixed speed to change the speed of the epicyclic gear 12 rotating around the sun gear 11. Thus, the rotation of pusher driving shaft 5 connected to the driven gear 4 is also, changed, and the pushing feed and separation of a metal plate by a pusher head can be performed.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a variable speed mechanism for a pusher device in a metal plate printing press.

[Conventional technology]

Conventional pusher devices do not have a mechanism to change the pusher head position, so the pusher is simply moved reciprocally, or a cam is installed to slow down the pusher head at the position where the metal plate and pusher head interfere. This prevents interference between the rear end of the metal plate and the pusher head.

[Problem to be solved by the invention]

However, in the conventional method described above, even after the impression cylinder grips the front end of the metal plate, the pusher head presses the rear end of the metal plate. Therefore, when the metal plate is short, the pressing force can be reduced to zero immediately after the impression cylinder grips the metal plate, but in the case of a metal plate with a long top and bottom, the pusher head continues to press until the point of claw dodging. . For this reason, even if the metal plate is printed, the grip is released, and the metal plate is conveyed to the delivery side conveyor, if the rear end does not reach the nail dodging point, it is still pressed by the pusher head, so that the impression cylinder and blanket cylinder are not marked. Depending on the pressure, the pressing force from the pusher head may overcome the pressure, causing the metal plate to flow first, causing misregistration.

[Means to solve the problem]

The present invention has been made in order to solve the above-mentioned problems of the prior art.In a pusher device of a metal plate printing machine that pushes a metal plate and presses it against an impression cylinder front cover, the pusher drive shaft is connected to a planetary gear of a planetary gear device. A pusher variable speed mechanism for a metal plate printing machine, which is connected to a sun gear drive shaft on the driving side via a driven gear attached to a gear, and is equipped with a pusher head that can periodically slow down and speed up. This is a pusher variable speed mechanism for a metal plate printing press, characterized in that a clutch is provided on the pusher drive shaft so that the phase can be adjusted.

[Effect]

In the pusher variable speed mechanism of the metal plate printing press according to the present invention, when the drive shaft of the sun gear is rotated at a predetermined speed in synchronization with the impression cylinder of the metal printing press, the planetary gear moves around the sun gear. Since it revolves around a predetermined speed while repeating deceleration and speed increase, the pusher drive shaft connected to the support shaft of this planetary gear also repeats deceleration and speed increase while rotating at a predetermined speed. For this reason, a pusher head installed on a pusher chain or the like driven by a pusher drive shaft pushes and suppresses a metal plate, which is a printing medium, onto an impression cylinder, and when the impression cylinder mold grips the front end of the metal plate, at the same time,
Alternatively, after gripping, the pusher chain can be decelerated to separate the pusher head from the rear end of the metal plate. In addition, the phase of the pusher drive shaft can be adjusted by disengaging the clutch, so the deceleration position of the pusher head can be freely adjusted, making it easy to print on metal plates of various sizes. .

【Example】

Next, the present invention will be explained in detail based on one embodiment illustrated in FIGS. 1 and 2. Reference numerals II and 12 denote a sun gear and its planetary gears constituting the planetary gear device 1. In this embodiment, four planetary gears 12 are arranged around the sun gear 11 at equal intervals. The sun gear 11 and the planetary gears 12 are loaded inside the housing I3 of the planetary gear device 1, and an internal gear 13a is carved on the inner periphery of the housing I3 so as to be able to mesh with the planetary gear 12. The housing 13 is rotatably supported via a bearing on a drive shaft 2 which is rotated by a drive motor or the like on the main body of the metal plate printing machine. Further, since the sun gear II is also rotatably fixed to the drive shaft 2, the sun gear 11 and the housing 1
3 is relatively rotatable via the planetary gear 12. The planetary gears 12 are each attached to a support shaft 12a in a freely rotating state, and the support shaft 12a is fixedly attached (however, it may be provided replaceably) to the side surface of the gear plate of the driven gear=-4, The driven gear 4 rotates in synchronization with the rotation of the planetary gear 12 along the internal gear 13a. The housing 13, which is freely rotatably supported on the drive shaft 2 via a bearing, can follow the movement of the cam 3 via an actuating plate 14, a connecting member 15, and an arm I6 that are integrated with the housing 13. It is provided. That is, the actuating plate 14 is protruded and fixed at an appropriate position on the outer periphery of the housing 13, and one end of the connecting member 15 is connected to the distal end side of the actuating plate 14 at the fulcrum 14a, and the other end of the connecting member 15 is connected to the arm. The arm I6 is connected to a fulcrum lea located approximately in the middle of the arm 16, and one end of the arm I6 is pivoted at a fulcrum 17a to a fixing member I7 installed, for example, on the frame of a metal plate printing machine, and the cam follower 18 at the other end is It is provided on the periphery of the cam 3 so as to be movable. Note that, as shown in FIG. 2C, one end of the connecting member 15 can be directly pivoted to a fulcrum 15a provided on the housing 13. The cam 3 has a relatively long circular arc portion 31 that is a part of the circumference around the rotation center 30, and a circular arc portion 31 that is not a perfect circle with respect to the rotation center 30 (a concave shape with a notch in the perfect circle). It consists of a relatively short non-circular part 32,
It is integrally fixed to the side surface of the gear plate of the driven gear 4 with its rotation center 30 aligned. The circumference AB of the non-circular portion 32 is a region where the distance from the rotation center 30 of the cam 3 decreases, and the circumference B-C is a region where the distance increases. On the other hand, a drive shaft rotation gear 58 that rotates the pusher drive shaft 5 is meshed with the driven gear 4 . This pusher drive shaft 5 is provided so that it can be connected to a drive shaft 51 and 52 at any phase angle via an electromagnetic clutch 53, and when the electromagnetic clutch 53 is disconnected,
A phase adjustment means 54 consisting of a manually operated rotary handle, an electric rotary motor, or the like that can rotate the drive shaft 52 by a desired angle is freely connectable to the distal end of the drive shaft 52. The drive shaft 52 is provided with a sprocket 55 for winding and driving the endless pusher chain 6. Note that the drive shaft 5 may be configured such that the drive shafts 51 and 52 are integrally provided without using the clutch 53. In the above pusher variable speed mechanism, the drive shaft 2 rotated by the drive motor etc. on the metal plate printing machine body side is connected to the second A
When the cam follower 18 rotates once in the direction of the arrow in the figure, the perfect circular arc portion 31 of the cam 3 rotates concentrically with the drive shaft 2.
Since the cam follower 18 does not move in any direction, the actuating plate 14 also does not move while the housing 13 is moving around the drive shaft 2 and remains stationary. However, when the cam follower 18 follows between the peripheral edges A and B of the non-circular portion 32 (an area where the distance from the rotation center 30 decreases), the cam follower 18
moves toward the right in FIG. 2A so as to approach the shaft center 30, so the tip of the actuating plate 14 also moves toward the right in the figure via the arm 16 and the connecting member 15, that is, in the direction of rotation of the drive shaft 2. Rotate in the opposite direction. Therefore, the housing I3, in which the actuating plate I4 is provided, rotates about the drive shaft 2 in a direction opposite to the direction of rotation of the shaft 2. On the other hand, Cam Follow 1
When the cam follower 8 follows the circumferential edge B-C of the cam 3 (an area where the distance from the rotation center 30 increases), the cam follower 18 moves away from the axis 30, contrary to the circumferential edge A-B. In order to move in the direction, the housing I3 rotates in the same direction as the rotation of the drive shaft 2 via the connecting member 15 and the actuating plate I4. In this way, even if the drive shaft 2 is rotating at a constant speed, the movement of the cam follower 18 that follows the periphery of the cam 3 may cause the housing 13 to stand still or the drive shaft 2 to
Since the planetary gear I2 rotates in the opposite direction or in the same direction as the rotation of the sun gear 11, the speed at which the planetary gear I2 revolves around the sun gear 11 changes. That is, when the housing 13 is stationary with respect to the sun gear 11, the number of gears (m) of the housing 13 and the sun gear! Ratio of the number of gears (n) in l, 37
The planetary gear I2 revolves in the rotational direction of the sun gear 11 at a speed equal to m multiplied by the rotational speed of the drive shaft 2, but the housing 13
While the planetary gear 12 is rotating in the opposite direction to the sun gear 11, the planetary gear 12 revolves around the sun gear 11 at a speed that is less than this rotational speed, and the housing 13 rotates in the same direction as the sun gear 11. During this period, the planetary gear 12 revolves around the sun gear II at a speed that is the sum of this rotational speed. therefore,
The cam follower 18 is the arc portion 3 of the cam 3! If the rotational speed when following the planetary gear 12 is the predetermined speed of the planetary gear 12, that is, the steady speed, then between the peripheral edges A and B, the speed will be reduced from the steady speed, and then return to the steady speed, and between the peripheral edges B and C, the speed will be reduced. Conversely, the speed increases (accelerates) from the steady speed, and then returns to the steady speed. Note that the shape of the cam 3 does not necessarily have to be formed symmetrically between the peripheral edges A and B and between the peripheral edges B and C of the non-circular portion 32 with respect to the straight line connecting the axis 30 and the peripheral edge B. For example, cam 3
When the rotation angle between the circumferential edges B and C is made larger than the rotation angle between the circumferential edges A and B, the cam follower 18 follows between the circumferential edges A and B in a short time and between the circumferential edges B and C in a long time. , the rotational deceleration of the housing 13 increases between the circumferential edges A and B, and the rotational increase speed of the housing 13 decreases between the circumferential edges B and C. Therefore, as shown in FIG. 4, the revolution speed V of the planetary gear 12 with respect to the sun gear 11 is a steady speed V between the peripheral edges A and B. The speed is greatly reduced for a short period of time, and the speed is steady between edges B and C. The speed increases slightly over a long period of time. Since the moving distances S1 and S2 of the planetary gear I2 between the peripheral edges A-B and between B-0 are equal, the sun gear 11 remains unchanged even after repeated deceleration/acceleration regardless of the shape of the non-circular portion 32.
The phase of the planetary gear I2 does not shift. Incidentally, each of the peripheral edges A1B1C of the cam 3 can be provided with a peripheral surface of appropriate curvature, and the arrangement position of the peripheral edges A1B1C is set in accordance with the setting position when the driven gear 4 is decelerated or accelerated. be. Therefore, when the drive shaft 2 is rotated at a predetermined speed in synchronization with the impression cylinder 8, etc., the planetary gears 12 rotate while changing the speed as described above, so that each planetary gear 12 has a support shaft 12a. The driven gear 4 attached through the drive shaft 2 rotates while being supported by the drive shaft 2, and the sprocket 55 and the pusher chain 6 are connected to the drive shaft rotating gear 53 which meshes with the gear 4 through the integrated drive shaft 5, etc. , while rotating at a predetermined speed, it also slows down and speeds up as it rotates. For example, when three pusher heads 6I are provided at equal intervals on one pusher chain 6 as shown in FIG. 3, the drive shaft 2 can rotate three times for one rotation of the pusher chain 6. , set the driven gear 4, sprocket 55, etc., and then push the rad 61 to any pusher.
The metal plate 7 is pushed and pressed onto the impression cylinder 8 by
The speed of the pusher chain 6 is reduced at the same time or after gripping by an impression cylinder type (not shown) provided on the impression cylinder 8 that rotates the front end of the pusher chain 6, and the pusher chain 6 is gripped by the impression cylinder 8 and moves forward. If the pusher head 61 is set so that it can be separated from the rear end of the metal plate 7 with a delay, the rad 61 will be successively moved to the second and third pushers during the second and third rotations of the drive shaft 2. When the metal plate 7 is pushed toward the impression cylinder 8 side, the front end of each plate can be gripped by the impression cylinder mold each time the impression cylinder rotates once. Note that the position at which the pusher decelerates the rad 61 differs depending on the length of the metal plate 7, so when changing the size, after disconnecting the electromagnetic clutch 53, the drive shaft is adjusted by manually operating the phase adjustment means 54 or by operating a switch. After rotating the pusher head 52 and setting the pusher head 61 at a desired position, the drive shaft 51 is reconnected to the drive shaft 52 using the electromagnetic clutch 53, thereby making it possible to print on metal plates 7 of various sizes.

【Effect of the invention】

As explained above, the pusher variable speed mechanism of the metal plate printing machine according to the present invention connects the pusher drive shaft to the planetary gear shaft of the planetary gear device, and periodically decelerates the pusher head.
The drive shaft of the sun gear can be synchronized with the impression cylinder of the metal printing press to rotate at a predetermined speed because the pusher drive shaft is equipped with a clutch that can be adjusted in phase. Then, the planet gear revolves around the sun gear while repeating deceleration and speed increase around a predetermined speed. For this reason, the pusher drive shaft connected to the rotating shaft of the planetary gear also rotates at a predetermined period while changing its speed, so the pusher head pushes and suppresses the metal plate to be printed onto the impression cylinder, and the front end of the metal plate The pusher head can be separated from the rear end of the metal plate by decelerating the pusher chain at the same time or after the impression cylinder is gripped. Therefore, the rear end of the metal plate will not be damaged. Furthermore, since the phase of the pusher drive shaft can be freely adjusted, the deceleration position of the pusher head can be easily adjusted, so that changes in the size of the metal plate can be easily accommodated.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention, Figs. 2A to 2C are explanatory diagrams of a planetary gear device, Fig. 3 is an explanatory diagram at the time of printing, and Fig. 4 is an example of speed change of a planetary gear. FIG. 1... Planetary gear device 11... Sun gear 12... Planetary gear 13
... Housing 14 ... Actuation plate 15 ...
Connecting member 16...Arm 18...Cam follower 2...Drive shaft 3...Cam 30...Rotation center 3I...Circular arc portion 32...
...Non-arc parts A, B, C...periphery 4...
Driven gear 5... Pusher drive shaft 51152... Drive shaft 53... Electromagnetic clutch 54... Phase adjustment means 55... Sprocket 8... Pusher chain 61... Pusher head 7... Metal Plate 8...Impression cylinder consideration

Claims (2)

[Claims] (1) In a pusher device of a metal plate printing machine that pushes a metal plate and presses it against the impression cylinder front cover, the pusher drive shaft is connected to the sun gear drive shaft on the driving side via a driven gear attached to a planetary gear of a planetary gear device. A pusher variable speed mechanism for a metal plate printing press, characterized in that the pusher head is connected to a pusher head and can be periodically decelerated and accelerated. (2) The pusher variable speed mechanism for a metal plate printing press according to item 1, characterized in that a clutch is provided on the pusher drive shaft so that the phase can be adjusted.