JPH04371836A - Cylinder contacting/separating device in sheet printing press - Google Patents

Abstract

PURPOSE:To obtain a cylinder contacting/separating device which can reduce a backlash of a gear in a cylinder-separated state and eliminate a shock mark and the like caused by a shock in abutting/separating a cylinder. CONSTITUTION:A cylinder contacting/separating device provided with a plate cylinder, a rubber cylinder, and an impression cylinder abuts or separates the rubber cylinder by rotating an intermediate race 2 of an eccentric bearing 1 of the rubber cylinder. The intermediate race 2 is selectively rotated to three rotating positions by a two stage stroke-type air cylinder 10. At the first rotational position, the rubber cylinder is abutted on both the plate cylinder and the impression cylinder to be in a complete contact state; at the second rotational position, the rubber cylinder is in contact with the plate cylinder but is separated from the impression cylinder to be in a partially separated state; and at the third rotational position, the rubber cylinder is separated from both the plate cylinder and the impression cylinder to be in a separated state.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder loading and unloading device for a sheet-fed printing press. When printing on a sheet-fed printing press, if the paper feed stops, the blanket cylinder must be removed. If the blanket cylinder is not removed, the blanket cylinder will hit the impression cylinder directly and the image will be transferred, causing bleed-through on the paper that is fed afterwards. Printing problems such as this occur. In order to deal with these problems, sheet-fed printing presses are provided with a body removal device that performs body removal and return (body insertion).

0002

2. Description of the Related Art Conventional body inserting and extracting devices are disclosed, for example, in Japanese Patent Application Laid-Open No. 61-219645 and Japanese Utility Model Application No. 2-599.
There is one shown in Publication No. 33. These devices are
The cam that rotates with the impression cylinder shaft and the eccentric bearing that supports the blanket cylinder are connected by a link mechanism, and the operation of the cam is not transmitted to the eccentric bearing during normal operation. The action is transmitted to rotate the eccentric bearing, and the cylinder is removed to release the rubber cylinder.

[0003] There are two methods for removing the blanket cylinder using a cam: one method is to separate the blanket cylinder from both the plate cylinder and the impression cylinder in one motion, and the other is to separate the blanket cylinder from the impression cylinder in the first movement of a two-stage motion, and then release the blanket cylinder from the impression cylinder in the second motion. There is a method of moving the rubber cylinder away from the plate cylinder.

[0004] The operation of the two-stage motion cam-type body insertion/extraction device will be explained based on FIG. 10. When the printing press is stopped and started, the ink forming rollers I1 to I4
, the swim roller D and the rubber cylinder G are all in the released state (
(See (A) in the figure), when a paper feed signal is input, printing preparations are made and the ink forming rollers I1 to I4 and water forming roller D are put on (see (B) in the figure). When the paper arrives at each printing unit, first the blanket cylinder G and the plate cylinder H are attached while the notches of each cylinder are in contact (the notches are facing each other), and then Rubber cylinder G and impression cylinder A are connected while the notches of each cylinder are in contact (
(see (C) in the figure), printing begins. When printing is finished or paper feeding trouble stops, the above order is reversed, that is, (C) → (B)
)→(A).

[0005]It is natural for a cam-type one-motion device, but even for a cam-type two-motion device, the blanket cylinder G is separated from both the impression cylinder A and the plate cylinder H after the cylinder is removed. . This is because it is mechanically difficult to stop the rotation of the cam midway, and even if it is stopped, the movement of the driven link becomes unstable. Therefore, there is no conventional apparatus in which the blanket cylinder G is separated from only the impression cylinder A, but is always designed to be separated from both the impression cylinder A and the plate cylinder H when removing the blanket cylinder.

[0006]

[Problems to be Solved by the Invention] Normally, when removing the blanket cylinder G, as shown in FIG. The center of the blanket cylinder G is shifted using eccentricity, and the center point of the eccentricity is determined so as to minimize the change in the distance between the centers of the blanket cylinder G and plate cylinder H. Next, shift the eccentricity of the blanket cylinder G further so that the gap Δd1 with the plate cylinder H is 0.5 mm.
As a result, shift the center of the rubber cylinder G until the
The gap Δd2 between the rubber cylinder G and the impression cylinder A is as large as about 1.0 mm.

[0007] As described above, when removing the shell in the cam type, the gap Δd2 between the rubber cylinder G and the impression cylinder A increases, and the backlash of the drive gear also increases, so the vibration due to backlash and the shock when the shell is inserted and removed are increased. becomes larger,
Printing problems such as shock marks on printed matter occur due to slipping between the plate and the blanket.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a body insertion/extraction device capable of reducing backlash of gears in the state of removal of the body and eliminating shock marks caused by shock of insertion/extraction.

[0009]

[Means for Solving the Problems] A cylinder loading/unloading device for a sheet-fed printing press according to the present invention includes a plate cylinder, a blanket cylinder, and an impression cylinder,
A body insertion/extraction device for inserting and removing a rubber cylinder by rotating an intermediate race of an eccentric bearing of the rubber cylinder,
The intermediate race is selectively rotated to three rotational positions by a three-position actuator, and in the first rotational position, the blanket cylinder is brought into contact with the plate cylinder and the impression cylinder, and in the second rotational position, the blanket cylinder is brought into contact with the blanket cylinder. The present invention is characterized in that half-drilling is performed in which the blanket cylinder is separated from the impression cylinder while being brought into contact with the plate cylinder, and complete drum-dipping is performed in which the blanket cylinder is separated from the printing cylinder and the impression cylinder at the third rotation position.

[0010] The actuator in the present invention includes:
It is sufficient that the actuating position can be selected from three positions, and a linear drive type air cylinder or hydraulic cylinder, or a swing type air motor or hydraulic motor can be used. When a linear drive type actuator is used, an arbitrary link mechanism or the like may be used to convert its output into rotational motion of the intermediate race of the eccentric bearing.

The present invention also provides an opposing rotation angle in which the notches of the plate cylinder and the blanket cylinder are in contact with each other, and a counter rotation in which the notches in the blanket cylinder and the impression cylinder are in contact with each other, based on the rotation angle of the impression cylinder. a control circuit that determines the angle, further determines the advance angle of each cylinder corresponding to the operating time of the actuator from the printing speed, and issues a command to insert the cylinder and remove the cylinder at a rotation angle obtained by subtracting the advance angle from the opposing rotation angle. It is characterized by having

0012

[Operation] In the present invention, since the actuator for rotating the intermediate race of the eccentric bearing operates in three positions, the intermediate race can be held in the rotational position in which the blanket cylinder is half removed. When the blanket cylinder is half removed, the blanket cylinder is separated from the impression cylinder but in contact with the plate cylinder, so there is virtually no gap between the plate cylinder drive gear and the blanket cylinder drive gear. . Therefore, the backlash between the drive gears is small, and the shock is small even when the half shell is removed and the shell is inserted from the half shell removed state. Therefore, the occurrence of shock marks and the like can be effectively suppressed.

[0013] Then, insert the body and remove the half body. The timing of complete cylinder removal is determined by the control circuit described above, so it is always performed at the position where the notches of each cylinder face each other, and the timing of complete cylinder removal is determined when the cylinder is removed during printing, after the leading edge of the paper has passed, or when the paper has not arrived. There is no dodging. Therefore, printing defects caused by timing errors do not occur.

[0014]

[Example] Next, an example of the present invention will be described. In FIG. 1, H is a plate cylinder, G is a blanket cylinder, A is an impression cylinder, and the blanket cylinder G is supported by an eccentric bearing 1. The eccentric bearing 1 has an eccentric intermediate race 2, and when this is rotated, the center of the blanket cylinder G is displaced with respect to the plate cylinder H and the impression cylinder A.

Reference numeral 10 denotes a two-stage stroke type air cylinder in which a first cylinder 11 and a second cylinder 12 are connected in tandem. 15 is a solenoid valve that controls the first cylinder 10, and when the solenoid S11 is excited and the port is switched, the piston rod 13 is extended, and the solenoid S11 is excited and the port is switched.
When 12 is energized and the port is switched in the opposite direction, the piston rod 13 is contracted. Also, 16 is the second
It is a solenoid valve that controls the cylinder 12, and is a solenoid S2.
When energizing 1 and switching the port, the piston rod 14
is extended, and when the solenoid S22 is energized and the port is reversely switched, the piston rod 14 is contracted. Therefore, this air cylinder 10 can be in the most contracted state in which both the first and second cylinders 11 and 12 are contracted, in the intermediate extended state in which only one of the first cylinder 11 or the second cylinder 12 is extended, and in the first, Second cylinder 11
, 12 can assume three operating positions, including a fully extended state in which both are extended.

The piston rod 13 of the first cylinder 11 is connected to the operating links 4 and 5 by pins 6 via the intermediate link 3. The other end of the operating link 4 is rotatably connected to the machine frame by a pin 7, and the other end of the operating link 5 is rotatably connected to a bracket 8 attached to the intermediate race 2. Furthermore, a guide link 9 is connected to the tip of the piston rod 13, and its movement trajectory is regulated. Further, the tip of the piston rod 14 of the second cylinder 12 is rotatably connected to the machine frame.

In the above configuration, the air cylinder 10
In the most contracted state (shown by the solid line in the figure), the intermediate race 2 is in the first rotational position P1, and the blanket cylinder G is in the cylinder insertion position in contact with the plate cylinder H and the impression cylinder A. In a predetermined intermediate extended state in which one of the cylinders 11 and 12 is extended, the intermediate race 2 rotates to the second rotational position P2, and in this state, the blanket cylinder G is in contact with the plate cylinder H, but the pressure The shell A is separated from the shell A, resulting in a state in which the shell is half removed. Furthermore, when the air cylinder 10 is in its most extended state, the operating links 4 and 5 are pushed upward (as shown by chain lines in the figure), the intermediate race 2 is rotated to the third rotational position P3, and the blanket cylinder G is connected to the plate cylinder H and the impression cylinder. It is in a state where the body is completely removed from A.

FIG. 2 shows a control circuit for the above-mentioned body insertion/extraction device. Each printing unit U is provided with the cylinder loading and unloading device shown in FIG. , a rotational speed detector 19 such as a rotary encoder connected to a main motor M that drives each printing unit U is attached. The controller 20 receives signals from each of the detectors and performs necessary calculations, and based on the results, the solenoids S11, S12, S12 of the electromagnetic valves 15, 16 expand and contract the air cylinder 10.
It emits an excitation signal to S21 and S22.

The control operation of the controller 20 basically consists of the solenoids S11, S11, and S11 in order to insert or remove the paper by detecting the presence or absence of paper using the phototube 17.
S12, S21, and S22 are operated using the following timing control. That is, each of the cylinders H, G, and A of the printing unit U is formed with a notch for a gripper that grips the paper, and the timing is set so that the cylinders are inserted and removed at a position where the notches of each cylinder meet each other. Failure to do so will result in printing defects. Therefore, based on the rotation angle taken out from the impression cylinder A, there is an opposing rotation angle where the notches of the plate cylinder H and the blanket cylinder G are in contact with each other, and an opposing rotation angle where the notches of the blanket cylinder G and the impression cylinder A are in contact with each other. I am trying to calculate the rotation angle. Also, air cylinder 1
0 takes time to operate, but during that time each cylinder H, G, A of the printing unit U is rotating, so the rotation angle, that is, the advance angle of each cylinder is calculated based on the printing speed. Then, at a rotation angle obtained by subtracting the advance angle from the opposing rotation angle, a command to insert the shell and remove the shell is issued, and when the operation of the air cylinder 10 is completed, the notches of each shell are aligned, and the shell is inserted and removed at an accurate timing. We are making sure that this is done.

[0020] Next, the action of inserting and removing the shell of the apparatus of this embodiment will be explained. State (A) in FIG. 6 shows a rest state of the printing press. In this state, the blanket cylinder G is connected to the plate cylinder H and the impression cylinder A.
has left from. In addition, ink forming rollers I1 to I
4 and the swimsuit roller D are also removed.

State (B) and state (C) in FIG. 6 show the operation from the above-mentioned hibernation state to the start of printing. The control operation during this time will be explained based on FIG. When the presence of paper is detected by the phototube 17, a first stage insertion command is issued, and the solenoid S12 is energized. As a result, the first cylinder 11 is contracted from the most extended state of the air cylinder 10, the intermediate race 2 is rotated from the third rotation position P3 to the second rotation position P2, and the blanket cylinder G is first attached to the plate cylinder H ( Figure 6(B)). As mentioned above, the printing cylinder H and the rubber cylinder G
The timing at which the notches match is determined by the detection signal from the rotation angle detector 18, and the timing is further corrected based on the detection value from the rotation speed detector 19. Incidentally, the ink forming rollers I1 to I4 and the water forming roller D are attached to the plate cylinder H at the same time as the first stage cylinder loading command is issued. Next, a second-stage cylinder insertion command is issued, and the solenoid S22 is energized to contract the second cylinder 12, rotate the intermediate race 2 to the first rotation position P1, and rotate the impression cylinder A and the blanket cylinder G. The rubber cylinder G is attached to the impression cylinder at the position where the notches meet (
Figure 6(C)). Printing starts from this point, and the printer continues to operate in this state during printing.

The printing press moves from the operating state to the rest state in the order of states (C)→(B)→(A) in FIG. The control operation during this time will be explained based on FIG.
2 is extended, the intermediate race 2 returns to the second rotational position P2, and as a result, the blanket cylinder G is separated from the impression cylinder A. This is state (B). Next, a first-stage shell removal command is issued, the solenoid S11 is energized, the first cylinder 11 is extended, and the intermediate race 2 returns to the third rotational position P3. As a result, the blanket cylinder G is separated from the plate cylinder H and completely removed. Then, the ink forming rollers I1 to I4 and the water forming roller D are also removed. This is state (A).

Now, the above is the startup (starting) during normal operation.
, a stop (body removal) operation, but if there is a paper feeding failure or a temporary stop during printing, a half body removal operation is performed as follows.

That is, as shown in FIG. 5, when a paper feed failure (no paper) is detected by the phototube 17, a second stage cylinder removal command is issued and the solenoid S21 is energized. This causes the second cylinder 12 to extend and the intermediate race 2 of the eccentric bearing 1 to rotate to the second rotational position P2. Further, the ink forming rollers I1 to I4 and the water forming roller D are also removed. In this state, the blanket cylinder G separates from the impression cylinder A, but the plate cylinder H
It is in a state where the body is half removed and is in contact with the . In other words, Figure 6 (S
).

Each cylinder H, G, A in this half-opened state
The meshing state of the drive gears for interlocking rotation is as follows. In FIGS. 7 to 8, Hg is the drive gear of the plate cylinder H,
Gg is a drive gear for the blanket cylinder G, and Ag is a drive gear for the impression cylinder A, and when the cylinders are inserted, they mesh with each other with their pitch circles touching each other. In Fig. 7, the dotted line is the rubber cylinder gear G.
g, the normal meshing state (that is, the shell-fitting state), the two-dot chain line shows the meshing state when the shell is half removed, and the solid line shows the meshing state when the shell is completely removed. Moreover, in FIG. 8, the dotted line shows the meshing state when the shell is inserted, and the two-dot chain line shows the meshing state when the shell is half removed. As clearly shown in FIGS. 7 and 8, the rubber cylinder gear Gg and the impression cylinder Ag in the half-opened state.
Although the gap Δd2 between the two is open (normally 0.5 mm)
, there is almost no gap Δd2 between the plate cylinder gear Hg and the blanket cylinder gear Gg. This is because the top dead center portion of the eccentric bearing 1 is used in the half-opened state, so the center distance hardly changes.

Next, returning to FIG. 5, when the printing press is temporarily stopped as described above and paper feeding is restarted normally, the phototube 17 detects the presence of paper and the ink form roller I
1 to I4 and the swimsuit roller D are used to issue a second-stage waist-fitting command. As a result, the solenoid S22 is energized, the second cylinder 12 is contracted, and the intermediate race 2 is
The rubber cylinder G is rotated to the rotation position P1 and inserted into the cylinder. As a result, the printing state shown in FIG. 6(C) is entered.

That is, in the present invention, once the printing state is started, the blanket cylinder G and the plate cylinder H remain attached and do not separate until the plate is replaced or the printing machine is stopped, or until there is no paper left in the printing machine. .

[0028] Then, inserting the body from the above-mentioned half-voided state,
And when removing the half cylinder from the cylinder insertion state, as mentioned above, the gap Δd1 between the plate cylinder H and the blanket cylinder G is substantially zero,
Since the gap Δd2 between the impression cylinder A and the blanket cylinder G is also about half of the gap in the completely removed state, the following advantages are produced. ■ Vibration due to backlash of the drive gear is reduced when half the shell is removed. ■ The total stroke when inserting and removing the shell can be reduced, reducing the impact caused by inertia. ■ The number of shocks given to the printed matter during carton insertion and carton removal is reduced by half compared to the case of complete carton removal (which is a two-step operation), since it is a one-stage operation. ■Based on the above (■) and (2), it is possible to eliminate printing problems during body insertion and body removal. ■ Conventional cam actuation systems require separate double cams for inserting and removing the shell, and a switching device for the cam follower, which increases costs, but in this example, this is replaced with an air cylinder, which significantly reduces costs. be able to.

Next, another embodiment of the present invention will be explained. The cylinder insertion/removal apparatus shown in FIG. 9 is applied to a printing unit having a cylinder arrangement different from that shown in FIG. 1. The air cylinder 10 is similar to the embodiment shown in FIG. 1, and only the link mechanism connecting the bracket 8 fixed to the intermediate race 2 of the eccentric bearing 1 and the piston rod 13 of the first cylinder 11 is different. That is, in this embodiment, a bell crank 27 is swingably supported by the pin 26, and the piston rod 13 of the first cylinder 11 is connected to one end of the bell crank 27, and the other end of the bell crank 27 and the intermediate Race 2 bracket 8
are connected by a link 28. When the air cylinder 10 extends, the bell crank 27 rotates as shown by the two-dot chain line, and the intermediate race 2 rotates. In this embodiment as well, it is possible to carry out body insertion, body removal, and half body removal in the same manner as in the embodiment shown in FIG.

In the present invention, the link mechanism connecting the intermediate race 2 and the air cylinder 10 is
Any mechanical link mechanism that can convert the linear reciprocating motion of the intermediate race 2 into a rotational motion of the intermediate race 2 is sufficient, and any mechanical link mechanism can be used in addition to the link mechanisms shown in FIGS. 1 and 9.

Furthermore, in the two embodiments described above, body insertion was performed by contracting the air cylinder 10, and body removal was performed by extension.However, on the contrary, body insertion was performed by extension, and body removal was performed by contraction. It may also be done. Therefore, it is optional to turn the air cylinder 10 upside down or change the configuration of the link mechanism.

Furthermore, instead of using the air cylinder 10, a swing type air motor or a hydraulic motor may be used to rotate the intermediate race 2 either directly or via a reduction gear.

[0033]

According to the present invention, it is possible to reduce the backlash of the drive gear during a temporary stop, and to eliminate printing problems such as shock marks caused by the shock of insertion and removal of the cylinder. In addition, since the timing of inserting and removing the barrel is precisely matched, printing defects will not occur.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a body insertion/extraction device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a control circuit in the embodiment.

FIG. 3 is a block diagram showing the control details of the waist-insertion operation in the same embodiment.

FIG. 4 is a block diagram showing control details of a body removal operation in the same embodiment.

FIG. 5 is a block diagram showing control details of a half-body removal operation in the same embodiment.

FIG. 6 is an explanatory diagram of the body insertion and body removal operation in this embodiment.

FIG. 7 is a diagram showing the backlash of the plate cylinder gear and the rubber cylinder gear during half cylinder removal.

FIG. 8 is a diagram showing backlash of the impression cylinder gear and the rubber cylinder gear when half the cylinder is removed.

FIG. 9 is a configuration diagram of a body insertion/extraction device according to another embodiment of the present invention.

FIG. 10 is a configuration diagram of a body insertion/extraction device in a conventional device.

[Explanation of symbols]

1 Eccentric bearing 2 Intermediate race 10 Air cylinder 11 First cylinder 12 Second cylinder 15 Solenoid valve 16 Solenoid valve 17 Phototube 18 Rotation angle detector

Claims (2)

[Claims] 1. A cartoning/extraction device comprising a plate cylinder, a blanket cylinder, and an impression cylinder, and for loading and unloading a blanket cylinder by rotating an intermediate race of an eccentric bearing of the blanket cylinder, wherein the intermediate The race is selectively rotated to three rotational positions by a three-position actuator. In the first rotational position, the blanket cylinder is in contact with the plate cylinder and the impression cylinder, and in the second rotational position, the blanket cylinder is in contact with the printing cylinder. A sheet-fed printing machine characterized in that a half cylinder removal is performed in which the blanket cylinder is brought into contact with the cylinder and separated from the impression cylinder, and a complete cylinder removal is performed in which the blanket cylinder is separated from the plate cylinder and the impression cylinder at the third rotation position. Body insertion/extraction device. [Claim 2] Based on the rotation angle of the impression cylinder, find the opposing rotation angle where the notches of the plate cylinder and the blanket cylinder are in contact with each other, and the opposing rotation angle where the notches of the blanket cylinder and the impression cylinder are in contact with each other. , further comprising a control circuit that calculates the advance angle of each cylinder corresponding to the operating time of the actuator from the printing speed, and issues a command to insert the cylinder and remove the cylinder at a rotation angle obtained by subtracting the advance angle from the opposing rotation angle. The body insertion/extraction device according to claim 1, characterized in that: