JPH0240505B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a master winding device for a printing press, which includes a master leading end clamping member and a trailing end clamping member within a groove formed in a part of a plate cylinder.

In conventional printing machines of this type, the front end clamp member detects the feeding of the master plate and operates automatically, but when operating the rear end clamp member, the front end clamp member The operator manually wrapped the clamped master around the plate cylinder and then operated it.

However, in this conventional manual winding method, it is difficult to tightly wrap the master around the plate cylinder, and as a result, the master floats off the plate cylinder, and this lifting of the master causes so-called overlapping in the printed image. In addition to significantly reducing image quality,
Since it requires labor and a relatively long time to attach the master to the plate cylinder, it has various drawbacks such as inconvenience in handling and poor work efficiency.

The present invention eliminates the drawbacks of the above-mentioned conventional methods, and the master is tightly wound around the plate cylinder, thereby reliably preventing the master from floating and improving the quality of the printed image. The object of the present invention is to provide a winding device.

The present invention will be described with reference to embodiments shown in the drawings.

In the drawings, 1 is a winding device, 2 is a master, and 3 is a winding device.
1 is a plate cylinder whose both ends are pivotally supported by a side machine frame (not shown), and a groove 4 is formed in a part of the circumferential surface, and a front end clamp member and a rear end clamp member (not shown) are formed in the groove 4. are provided, and cam plates 5, 5 (only the front one is shown) are fixed to both end faces. There are approximately V-shaped side plates 6, 6 on the side machine frame.
(only the front one is shown) is pivotally mounted on a shaft 7,
Between the side plates 6 and 6 are a pumping roller 9 whose lower part is immersed in the etching liquid in an etching liquid tray 8 held on the machine frame by appropriate means, and an intermediate roller 10 which is in circumferential contact with the pumping roller 9. , an etching roller (Molton roller) 11 circumferentially surrounding the intermediate roller 10 are supported by shafts 7, 12, and 13, respectively.

Brackets 14, 14 (only the front one is shown) are pivotally attached to the side plates 6, 6 by a shaft 13, and each bracket 14 has an L-shaped cross-sectional upper part 15 and a cross-sectional lower part 16, which are connected to each other by screws 17. It is fixed in shape, and a protrusion 18 is formed on the upper part 15.
The lower part 16 consists of an outer leg 16a, an inner leg 16b, and a connecting part 16c that connects both legs.
A cam follower 19 that cooperates with the cam plate 5 is rotatably attached to the cam plate 6a, and the inner leg 16b is pivoted to the side plate 6 with its outer surface in contact with the inner surface of the side plate 6. Inner leg 16b, 1
A presser roller 2 is pivotally supported between the rollers 6b. The presser roller 20 may have a shape in which a plurality of short rollers are spaced apart from each other in the axial direction so as not to interfere with the clamping operation of the rear end clamp member having a comb tooth shape, for example. preferable.

A substantially L-shaped lever 21 is also pivotally attached to each side plate 6 by a shaft 22, and one end of the lever 21 has a projection 18.
A notch 23 is formed that cooperates with the other end, and a protrusion 25 that cooperates with a leaf spring 24 fixed to each side machine frame is formed at the other end. Both ends of a tension spring 26 are attached to each side plate 6 and to the upper portion 15 of each bracket 14.

An operating lever 27 is also pivotally mounted on each side frame by a shaft 28, and a spring 29 is wound around the shaft 28, one end of the spring 29 is attached to a protrusion 30 provided on the side machine frame, and the other end is attached to a projection 30 provided on the side machine frame. The end is attached to a projection 31 provided on the actuating lever 27, and the actuating lever 27 is also provided with a projection 32 that cooperates with the side plate 6.

An arm 33 is integrally fixed to the end of the shaft 7 projecting outward from the side plate 6 on the other side, and a cam follower 34 is pivotally supported at the tip of the arm 33 and cooperates with the cam follower 34. A cam plate 35 is rotatably attached to the machine frame on the other side with a shaft 36. In the figure, reference numerals 37 and 38 are stoppers that are provided on the side machine frame and cooperate with the side plate 6 and the bracket 14, respectively.

The operation of the above-mentioned device will be described below, but to simplify the explanation, for example, what should be the side plates 6, 6 will be simply referred to as the side plate 6.

First, until the master 2 is fed, the winding device 1
is in the standby position shown in FIG. In this standby position, the cam plate 35 is held at the illustrated position by an appropriate actuating member (not illustrated). Therefore, the cam follower 34 rides on the large diameter part of the cam plate 35, and the side plate 6 resists the expansion force of the spring 29
is held together with the actuating lever 27 in the position shown. The bracket 14 is held in the position shown by being engaged with a stopper 38 against the tension of the tension spring 26.

When the master 2 is fed by an appropriate plate feeding member (not shown), the tip clamp member clamps the tip of the master 2, and an appropriate means (not shown) detects the plate feeding and operates the actuating member to disable the cam plate. 3
5 clockwise to the positions 2 to 4 shown in the figure. Then, the cam follower 34 comes off from the large diameter part of the cam plate 35, and the side plate 6, which has lost its stopper, is pushed by the protrusion 32 of the actuating lever 27 due to the expanding force of the spring 29, swings counterclockwise, and is moved to the stopper 37. It gets locked and stops. At the beginning of this swing, the notch 23 of the lever 21 is temporarily lifted upward because the protrusion 25 is locked to the leaf spring 24, and therefore the bracket 14 has the protrusion 18 locked to the notch 23. It swings clockwise due to the tensile force of the tension spring 26, and the lower right edge of the connecting portion 16c of the lower portion 16 in the drawing is stopped by the upper surface of the side plate 6 (see FIG. 3). Further, after the notch 23 of the lever 21 is temporarily lifted upward as described above, the protrusion 25 comes off the leaf spring 24 and rides on the protrusion 18 by its own weight (see FIG. 3). In this way, when the swinging of each part has stopped, the winding device 1 has been brought to the operation start position. The state in which the winding device 1 is in the operation start position is almost the same as shown in FIG. 3, but differs from FIG. 3 in the angle of the plate cylinder 3. That is, as shown by the chain line in FIG.
The presser roller 20 is located in the groove 4 of the plate cylinder 3, and therefore does not collide with the circumferential surface of the plate cylinder 3 when it is displaced from the standby position to the operation start position.

Next, when the plate cylinder 3 rotates counterclockwise, the presser roller 20 presses the master 2 against the plate cylinder 3 and rides on the circumferential surface of the plate cylinder 3, thereby causing the bracket 14 to swing counterclockwise. When the connection part 16c and the side plate 6 are disengaged (see FIG. 2), the tension spring 26
The tensile force effectively acts on the pressing force of the master 2 by the presser roller 20, and then the etching roller 11
The master 2, which has been pressed by the presser roller 20, is brought into pressure contact with the plate cylinder 3 again and rides on the circumferential surface of the plate cylinder 3. The amount by which the etching roller 11 rides up is very small compared to the amount by which the presser roller 20 rides up, and gives the side plate 6 a tendency to move away from the stopper 37. As a result, the spreading force of the spring 29 is transferred to the etching roller 11. This is enough to effectively act on the pressing force of the master 2, and of course is not so large as to impair the original etching function of the etching roller 11 due to excessive pressing force. In this way, the master 2 is applied to the plate cylinder 3 twice by the presser roller 20 and the etching roller 11 following it.
The material is tightly wound while being pressed against the material (see Figure 2). At this time, the etching liquid is applied not only to the etching roller 11 but also to the surface of the master 2.

When the plate cylinder 3 rotates approximately once, the presser roller 20 comes off the circumferential surface of the plate cylinder 3 and falls into the groove 4, thereby pushing the rear end of the master 2 into the groove 4, as shown in FIG. At this time, the rear end clamp member clamps the rear end of the master 2. As the plate cylinder 3 continues to rotate, the cam follower 19 rides on the cam plate 5, the bracket 14 swings counterclockwise, and the presser roller 20 comes off the surface of the master 2. At this time, the protrusion 18 fits into the notch 23 and the bracket 14 is held in this position (see FIG. 4).

Subsequently, during the second and subsequent rotations of the plate cylinder 3, the fourth
Maintained in the illustrated state, the etching roller 11 performs the required amount of etching without the pressing roller 20 staining the surface of the master 2.

When the required amount of etching is completed, the actuating member returns to rotate the cam plate 35 clockwise to the position shown in the first figure. Then, the cam follower 34 again rides on the large diameter portion of the cam plate 35, whereby the side plate 6, together with the operating lever 27, swings clockwise and is brought to the position shown in the first figure. At the end of this swinging, the bracket 14 is stopped by the stopper 38, and when the swinging is completed, the protrusion 18 is separated from the notch 23 as shown in the first figure, and in this state, the winding device 1 is on standby. This means that it has returned to its position. The reason why the protrusion 18 is kept away from the notch 23 in the standby position is that the protrusion 18 is kept away from the notch 23 at the beginning of displacing the winding device 1 to the operation start position.
This is to allow the lever 21 to pass under the lever 21 and swing clockwise without being caught by the lever 3.

It goes without saying that the present invention allows various changes and modifications to the above embodiments.

Since this invention is configured as described above, the master can be tightly wrapped around the plate cylinder by the presser roller and the etching roller, thereby reliably preventing the master from floating and improving the quality of printed images. In addition, it has excellent effects such as being able to automate the mounting of the master onto the plate cylinder, thereby improving work efficiency.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view showing the standby position, FIG. 2 is a winding operation position, FIG. 3 is a rear end folding position, and FIG. 4 is an etching operation position. It is. 1... Winding device, 2... Master, 3... Plate cylinder,
4... Concave groove, 5, 35... Cam plate, 6... Side plate,
8... Etching liquid plate, 9... Pumping roller, 1
0...Intermediate roller, 11...Etching roller,
14...Bracket, 16a...Outer leg, 16b
...Inner leg, 16c...Connection part, 18, 25, 3
2... Protrusion, 19, 34... Cam follower, 20...
... Presser roller, 21 ... Lever, 23 ... Notch, 24 ... Leaf spring, 26 ... Tension spring, 27 ...
...Operating lever, 29...Spring, 33...Arm,
37, 38...stoppa.

Claims (1)

[Claims] 1. In a printing machine equipped with a front end clamp member and a rear end clamp member of a master 2 in a groove 4 formed in a part of a plate cylinder 3, a pair of side plates 6 are swung around a shaft 7 provided in a machine frame. The cam follower 34 is freely attached and interlocks integrally with the side plate 6, and the side plate 6 is attached to the plate cylinder 3.
A movable bracket 1 is provided with a first biasing member 27 that biases toward the side plate 6, and is pivotally connected to the etching roller 11 and a shaft 13 at a position of the side plate 6 facing the plate cylinder 3.
4, and a presser roller 20 adjacent to the etching roller 11 in the rotational direction of the plate cylinder 3 is rotatably attached to the movable bracket 14. A cam follower 34 is provided on the machine frame and engages alternately with a small diameter portion and a large diameter portion of a rotary cam 35 that is rotated during plate feeding to cause the side plate 6 to be attached to the first attachment. The etching roller 11 is moved by the biasing force of the biasing member 27.
The etching roller 11 swings alternately between an operating position where the etching roller 11 is pressed against the master 2 on the plate cylinder surface and a standby position where the etching roller 11 is separated from the master 2 against the biasing force of the first biasing member 27. When the side plate 6 is in the operating position, the movable bracket 14 is swung to move from the second pressing position where only the presser roller 20 is pressed against the master 2 on the plate cylinder surface about the shaft 13.
In order to resist the biasing force of the biasing member 26 and swing to a separated position away from the master 2, a movable bracket 14 is provided when the plate cylinder 3, which clamps the tip of the master, rotates to a predetermined position. A cam 5 that engages with the cam follower 19 is provided on the side surface of the plate cylinder 3, and the engagement between the cam 5 and the cam follower 19 separates only the presser roller 20 from the master 2 while pressing the etching roller 11 onto the plate cylinder surface. and a lever member 21 for holding the presser roller 20 at the separated position after the master wrapping device has been used.