JPH0319845A - Adjusting device for clearance between cylinders in printing press - Google Patents

Abstract

PURPOSE:To improve the quality of printed matter by a method wherein a worm is attached to a drive shaft which is connected to a motor, and one end of a connecting rod is pivotally attached to the tip of a following shaft which is equipped with a threaded part that screws in to a threaded hole in a worm wheel which engages with this worm, and the other end of this connecting rod is pivotally attached to the outer periphery of an outer bearing. CONSTITUTION:At the time of starting a printing work, an inner bearing 26 rotates clockwise around on axial center F4 in an inside peripheral circle 25b of an outer bearing 25, which stays still, by a cam mechanism through a link 29, a lever 31 and a rod 32. Therefore, a rubber cylinder 22 makes an axial center F5 give an eccentric rotation around the axial center F4, and is set to a pressure cylinder 23. When the printing work is completed, the inner bearing 26 rotates counter-clockwise by the cam mechanism through the link 29 and the rod 32. Therefore, by the eccentric motion, the rubber cylinder 22 is released from the pressure cylinder 23.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inter-cylinder gap adjusting device for adjusting the gap between a blanket cylinder and an impression cylinder in a printing press in accordance with the thickness of the blanket cylinder.

[Conventional technology]

In offset printing machines, etc., the image formed on the plate surface of the plate cylinder using ink and dampening water is transferred to the blanket surface of the blanket cylinder that is in contact with the plate surface, and this transferred image is transferred to the blanket surface of the blanket cylinder that is in contact with the plate surface. The print is transferred to paper that is held in the claws of the adjacent impression cylinder and conveyed between the blanket cylinder and the impression cylinder. During printing, printing pressure is applied to the impression cylinder that is in pressure contact with the blanket cylinder.In such printing operations, if the distance between the centers of the blanket cylinder and impression cylinder is constant, the circumferential surface of the blanket cylinder and the impression cylinder are The gap with the circumferential surface is constant, and if the thickness of the printing paper changes, the above printing pressure will change and proper printing will not be performed. Therefore, the distance between the centers of the two lines should be changed according to the paper thickness. A gap adjustment device for adjusting the gap between both cylinders has been conventionally provided. Figure 3 is a front view of the adjustment operation section of this type of conventional inter-body clearance adjustment device. In the figure, a blanket cylinder 1 with a blanket wrapped around its circumferential surface and a double-diameter impression cylinder 2 whose circumferential surface is in contact with the blanket surface are supported by bearings on the left and right frames. , the rubber cylinder l is pivotally supported on a double eccentric support 3. The double eccentric bearing 3 includes an outer bearing 4 having an outer circumference 4a supported in a bearing hole of a frame, and an inner bearing 5 having an outer circumference 5a fitted into an inner circumference 4b of the outer bearing 4. The end shaft of the rubber cylinder l is pivotally supported on the inner circumferential circle 5b of the inner bearing 5. The axis of the outer ring bearing outer circumference 4a, indicated by the symbol F in the drawing, and the axis of the inner bearing outer circumference 5a, indicated by the symbol P, are eccentric by an amount indicated by the symbol t in the figure, and the inner ring bearing outer circumference The axial center F of the circle 5a and the axial center of the blanket cylinder 1, which is indicated by the symbol F2 in the figure, are offset by an amount indicated by the symbol t in the figure. Reference numerals 6 and 7 are guides that hold down each bearing 4 and 5 and guide their rotation. On the other hand, a lever that swings by a cam mechanism (not shown) is pivotally supported at both wheel ends of the impression cylinder 2, and one end is pivotally attached to the free end of this lever, and as the lever swings, it is The other end of the link 8, which advances and retreats in the direction indicated by, is a lever IO rotatably supported on a shaft 9 on the frame side close to the rubber cylinder l.
It is attached to one free end of the frame. Also, the lever lO
The other tt end of the inner bearing 5 and the outer circumference of the inner bearing 5 are connected by a rod 1l whose both ends are connected by a frame. With this configuration, when the link 8 moves forward and backward by the cam mechanism and the lever IO rotates, the inner ring bearing 5 rotates in the forward and reverse directions by a predetermined angle, and the inner bearing 5 and the rubber cylinder 1 described above rotate. The rubber cylinder 1 is attached to and detached from the impression cylinder 2 due to the eccentric action of the cylinder. It is arranged so that the body is removed.

Further, on a stand l2 installed on the frame side in close proximity to the rubber cylinder l, an operating shaft l4 with a knob 13 is restricted from moving in the axial direction by a low-left milled collar 14a and a double nut l5. and is rotatably supported on the shaft.
A threaded portion of a rod 16 fixed to the outer bearing 4 is screwed into the threaded hole so that it can move forward and backward. As a result, the operating axis l
4 is rotated, the rod l6 advances and retreats due to the screw action, and the outer ring bearing 4 rotates, and the inner bearing 5 moves due to the eccentric action of the outer bearing 4 and the inner bearing 5, and the inner ring when inserted into the shell. The end limit of rotation of the receiver 5 is changed to correspond to the thickness. 17 is a temporary spring for preventing rotation that engages the knurled groove of the flange with the protrusion, and 18 is an adjustable stopper that restricts both rotational limits of the outer bearing 4. By being placed horizontally as described above, at the start of printing work, the inner bearing 5 is rotated clockwise in the figure via the link 8, lever 10, and rod l1 by the cam mechanism, so that the eccentric action causes the inner bearing 5 to rotate. The cylinder ■ is inserted into the impression cylinder 2. When the printing process is complete, the cam mechanism causes link 8 to
As the inner bearing 5 is rotated counterclockwise via the lever 10 and the rod 11 to the state shown in the figure, the blanket cylinder 1 is removed from the impression cylinder 2 by eccentric action. If the thickness changes, hold the knob l3 and turn the operating shaft l.
When the rod 4 is rotated, the rod 16 whose threaded portion is screwed into the screw hole advances and retreats, and the outer bearing 4 rotates, so the inner ring holder 5 moves due to the eccentric action of the outer ring holder 4 and the inner ring holder 5. However, by restricting the rotation end limit of the inner ring support 5 when inserting the cylinder, the gap between the rubber cylinder 1 and the impression cylinder 2 changes to correspond to the thickness. However, in such conventional devices,
In order to adjust the gap between the cylinders corresponding to the thickness, the operating shaft l4 must be rotated manually, which makes the operation difficult, and especially in the case of a multi-color printing press, an operating section must be provided for each printing unit. Therefore, there was a problem that the operation was troublesome and required a long time and a great deal of effort. Therefore, a W4 gap adjustment device that can be automatically adjusted by remote control has been proposed, for example, as disclosed in Japanese Unexamined Patent Publication No. 134244/1983.

In this device, the structure of the rubber cylinder and its double eccentric bearing is exactly the same as the device shown in FIG. 3, and therefore will be explained using the reference numerals shown in the same figure. That is, a bezel gear is attached to the motor shaft of the motor that is supported on the frame side in close proximity to the rubber cylinder 1, and this bail gear is connected to a bezel gear on an intermediate shaft provided orthogonally to the motor shaft. The pinion on the intermediate shaft meshes with the sector gear fixed to the outer periphery of the outer bearing 4. With this configuration, when the motor rotates according to a command from the control device, the bail gears mesh with each other,
Pinion. The outer bearing 4 rotates by a predetermined angle due to the engagement of the sector gear, and the gap between the cylinders is adjusted.

[Problem to be solved by the invention]

However, in such a conventional inter-body clearance device, the rotation of the motor is caused by a bell gear or a pinion. It is transmitted to the outer bearing via multiple gears such as sector gears, so
As the backlash accumulates, play in the inner bearing increases, and with large printing pressure applied, the cylinder notch of the impression cylinder comes into contact with the blanket cylinder, and the pressure changes rapidly between the beginning and end of contact. As a result, there was a problem in that shock marks occurred and the quality of the printed matter deteriorated. [Means for Solving the Problems] In order to solve these problems, in the present invention, the end shaft of the rubber cylinder is supported by the inner circumference of an inner ring bearing having an inner circumference eccentric with respect to the outer circumference. The outer circumference of the inner bearing is connected to the outer circumference of the inner circumference and the rubber cylinder attachment/detachment mechanism, and the outer circumference of the inner bearing is formed into an outer ring having an inner circumference that is eccentric with respect to the outer circumference that fits into the bearing hole on the frame side. The tip of the driven shaft is supported by the inner circumference of the receiver, and the worm is pivotally attached to the drive shaft that is connected to the motor, and the tip of the driven shaft is equipped with a threaded part that engages with the screw hole of the worm wheel that meshes with the worm. One end of the connecting rod was pivotally attached to the connecting rod, and the other end of the connecting rod was pivotally attached to the outer periphery of the outer bearing. [Operation] When the inner bearing rotates in the cylinder attachment/detachment mechanism, the rubber cylinder is inserted into and removed from the impression cylinder. When the paper thickness is changed, when the motor rotates, the drive shaft rotates and the driven shaft moves up and down due to the engagement between the worm and the worm wheel and the screw action between the worm wheel and the driven shaft, and the connecting rod Since the outer ring bridge rotates through the , the gap between the rubber cylinder and the impression cylinder is adjusted. In this case, since the upstream side of the wedge part directly connected to the outer ring holder is constructed with a worm and a worm foil, the amount of play in the outer ring holder due to pressure fluctuations between the rubber cylinder and the impression cylinder is reduced, and the printing The sudden reaction of time is not transmitted to the motor, etc.

〔Example〕

Figures 1 and 2 show an embodiment of the cylinder gap adjustment device for a printing press according to the present invention, Figure 1 is a partially cutaway side view of the vicinity of the blanket cylinder in which this is implemented, and Figure ■1■ Longitudinal cross-sectional view of the figure. In the figure, a plate cylinder 2l with a plate attached to its circumferential surface is rotatably supported on the left and right frames 20 of the printing unit via bearings, and a plate cylinder 2l with a plate wrapped around its circumference is mounted below it. A blanket cylinder 22, which is placed in contact with the plate surface, is pivotally supported by a frame 20 via a double eccentric bearing 24, which will be described later. Furthermore, the lower part of the rubber cylinder 22 has a rubber I
An impression cylinder 23 is disposed in contact with the blanket surface of the i22. Then, the paper fed onto the differential plate by a paper feeding device (not shown) is conveyed while being gripped by a claw provided in a notch on the outer periphery of the impression cylinder 23. The image is transferred and printed.

The double eccentric bearing 24 that pivotally supports the rubber cylinder 22 has an outer ring bearing 25 whose outer circumference 25a is pivotally supported in the bearing hole of the frame 20.
and an inner bearing 26 in which an outer circumference 26a is fitted into an inner circumference 25b of the outer bearing 25, and an end shaft 22a of the rubber cylinder 22 is supported on the inner circumference 26b of the inner bearing 26. It has been done. The axial center of the outer ring bearing outer circumferential circle 25a, indicated by the symbol F in the figure, and the axial center of the inner bearing outer circumferential circle 26a, indicated by the symbol F, are as follows.
It is eccentric by an amount indicated by the symbol t2 in the figure, and the axis F of the inner bearing outer circumferential circle 26a and the rubber cylinder 2 indicated by the symbol F% in the figure.
The axis of No. 2 is offset by an amount indicated by the symbol t3 in the figure. By doing so, when the inner bearing 26 is rotated, the blanket cylinder 22 is rotated eccentrically, and is configured to be attached to and removed from the impression cylinder 23 and inserted into and removed from the cylinder. Reference numerals 27 and 28 are guides that hold down the outer ring holder 25 and guide its rotation.

Therefore, an attachment/detachment mechanism for attaching and detaching the rubber cylinder 22 to and from the impression cylinder 23 by rotating the inner ring receiver 26 will be described.

A lever that retracts by a cam mechanism (not shown) is pivotally supported at both shaft ends of the impression cylinder 23, and one end is connected to the free end of this lever, and as the lever slides, it moves as shown by arrow B in the figure. The other end of the link 29, which moves forward and backward in the direction shown, is pivotally connected to one free end of a lever 3l rotatably supported by a bin 30 on the frame side adjacent to the rubber cylinder 22. Also, lever 3
The other free end of the inner bearing 26 and the outer circumference of the inner bearing 26 are connected by a rod 32 which is connected at both ends. By being arranged in this manner, when the link 29 moves forward and backward by the cam mechanism and the lever 3l rotates as shown by the solid line and chain line in the figure, the inner ring bridge 26 rotates in the forward and reverse directions by a predetermined angle. death,
Due to the eccentric action of the inner ring holder 26 and the rubber cylinder 22 mentioned above,
The rubber cylinder 22 is configured to be inserted into and removed from the impression cylinder 23.

A drive shaft 34 is rotatably supported in bearings 33 fitted in the bearing holes of the left and right frames 20 in close proximity to the rotating discharge portion of the rubber cylinder 22 and the impression cylinder 23. axis 34
The shaft end of the motor 36 supported by the subframe 35
The motor shaft 37 and the coupling 38 are connected to each other.

A box-shaped gear box 41 that pivotally supports both ends of the drive shaft 34 via a bearing 39 and a thrust bearing 40 is bolted to the outside of each of the left and right frames 20.
A worm 42 is located in the gearbox 4l and is pivotally attached to the drive shaft 34 with a key 43. 44 is the drive shaft 34
This is a cover that covers the Furthermore, in the bearing hole of the gearbox 4l, a worm wheel 45 that meshes with the worm 42 is pivotally supported via a cylindrical boss portion via a bearing 46, and a driven shaft perpendicular to the drive shaft 34 is provided in the screw hole. One end of a connecting rod 48 is attached to the U-shaped portion at the tip of the driven shaft 47, into which the threaded portion of the shaft 47 is screwed so as to be freely forward and backward, with a pin 49, allowing the connecting rod 48 to move freely. The other end is pivotally attached to the outer periphery of the outer bearing 25 with a pin 50 so as to be freely drawn. By doing this, when the drive shaft 34 is rotated by the motor 36 and the worm 42 is rotated, the worm wheel 45 that meshes with the worm wheel 45 rotates, and the driven shaft 47 moves back and forth due to the shearing action. The outer ring bearing 25 is configured to rotate. 51 is a stopper located in the recess of the outer bearing 25 and fixed to the frame 20 side in a freely adjustable rotational manner. It is configured to regulate the moving end limit.

A potentiometer 52 electrically connected to a control device (not shown) is fixed to one frame 20 in close proximity to the plane of the outer bearing 25. A corresponding striker 53 is fixed. By doing this, the outer bearing 25
The potentiometer 52 detects the rotation angle and issues a signal, and the motor 36 is stopped at the set angle rotation position of the outer bearing 25 via the control device.

With the above structure, when starting printing work, the link 29 and the lever 31 are moved by the cam mechanism.
Outer ring holder 2 with inner ring holder 26 stationary via rod 32
Since the rubber cylinder 22 rotates clockwise in the figure around the axis F4 within the inner circumferential circle 25b of No. It is put in the body. When the printing operation is completed, the inner bearing 26 is rotated counterclockwise by the cam mechanism via the link 29, lever 31, and rod 32 to the state shown in the figure, so that the blanket cylinder 22 is moved relative to the impression cylinder 23 due to eccentric action. The body is removed.

For example, when the paper changes from thin paper to thick paper, after manually inputting the paper size to the control device, the motor 36 is started to rotate the drive shaft 34, and a worm wheel meshes with the worm 42 that rotates integrally with the motor 36. 45 rotates, and the driven shaft 47 rises due to the shear action, so the outer bearing 25 rotates counterclockwise in the figure via the connecting rod 4. When the outer bearing 25 rotates, the potentiometer detects the rotation angle of the outer ring holder 25 and issues a signal using the shear striker 53 that rotates integrally with the outer bearing 25. When this matches the paper size manually entered into the control device, the motor 36 The rotation of stops. In this case, the outer ring bearing 25 moves the inside of the bearing hole of the frame 20 into which the outer circumferential circle 25a fits with respect to the stationary inner ring bearing 26 to the axis center F3.
Since it rotates counterclockwise as shown in the figure, the outer circumference is 2.
The inner bearing 26 rotates eccentrically with the inner circumferential circle 25b which is eccentric with respect to the inner circumference 5a. As a result, the gap between the blanket cylinder 22 and the impression cylinder 23 when inserted into the cylinder becomes large, which corresponds to thick paper. In this embodiment, the potentiometer 52 is connected to the rubber cylinder 2.
Since the outer bearing 25 is provided close to the outer bearing 25 that directly moves the axial center of the outer bearing 25, control accuracy is improved. Although this embodiment shows an example in which the rotation of the motor is controlled by a control device, the motor may also be rotated by operating a push button or the like. (Effects of the Invention) As is clear from the above description, according to the present invention, in the cylinder gap adjustment device of a printing press, the end shaft of the blanket cylinder is fixed to an inner bearing having an inner circumferential circle eccentric to the outer circumferential circle. The outer circumference of the inner bearing is supported by an inner circumferential circle, and the outer circumferential part of the inner circumferential circle is connected to the rubber cylinder attachment/detachment mechanism, and the outer circumferential circle of the inner bearing is eccentrically supported with respect to the outer circumferential circle that fits into the bearing hole on the frame side. The worm is supported by the inner circumference of an outer bearing having a circumferential circle, and the worm is pivotally attached to a drive shaft connected to the motor, and has a threaded portion that engages with a threaded hole in a worm wheel that meshes with the worm. One end of the connecting rod is pivoted to the tip of the driven shaft, and the other end of the connecting rod is bracketed to the outer circumference of the outer bearing. Since a worm and a worm wheel are provided, play in the outer bearing due to pressure fluctuations between the blanket cylinder and impression cylinder is extremely small, and even if the printing pressure fluctuates due to the notch in the impression cylinder, scratches will not occur. figure,
The quality of printed matter improves. In addition, by using a worm and a worm wheel in the drive system, a large reduction ratio can be achieved, making it possible to downsize the motor and provide the device at a low cost. Durability is improved because recoil is not transmitted to the motor, reduction unit, etc.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the cylinder gap adjustment device for a printing press according to the present invention, Figure 1 is a partially cutaway side view of the vicinity of the blanket cylinder in which this is implemented, and Figure FIG. 3 is a vertical sectional view taken along line 1--2 in the figure, and a front view of an adjustment operation section in a conventional inter-body clearance adjustment device.

Claims (1)

[Claims] The end shaft of the blanket cylinder that is in contact with the impression cylinder is supported by the inner circumference of an inner bearing having an inner circumference that is eccentric with respect to the outer circumference, and the outer circumference of the inner circumference and the rubber cylinder attachment/detachment mechanism are connected to each other. The outer circumferential circle of the inner bearing is pivotally supported by the inner circumferential circle of the outer bearing, which has an inner circumferential circle eccentric to the outer circumferential circle that fits into the bearing hole on the frame side, and is drivingly connected to the motor. A worm is attached to the drive shaft, and one end of a connecting rod is pivotally attached to the tip of a driven shaft, which has a threaded portion that engages with a threaded hole in a worm wheel that meshes with the worm. A cylinder gap adjustment device for a printing press, characterized in that the device is pivotally mounted on the outer periphery of the outer bearing.