JPH0464510B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cylinder cleaning device for a sheet-fed printing press, and particularly to a cylinder cleaning device for a sheet-fed printing machine, and in particular, a cylinder cleaning device for a sheet-fed printing press that cleans a cylinder from the outer peripheral surface in order to grasp the end of a sheet-like member such as a sheet of paper. The present invention relates to a cylinder cleaning device that is equipped with a mechanism for eliminating unwiped residue on a portion of a cylinder having a protruding claw immediately behind the claw.

[Conventional technology]

Examples of conventional cylinder cleaning devices for sheet-fed printing presses include (1) Japanese Patent Application Laid-Open No. 63-37945, (2) Japanese Patent Application Laid-open No. 63-37945.
-37946, (3) JP-A-63-92456, etc.

Of these, (1) states that the blanket cylinder cleaning device of earlier sheet-fed printing machines could not be used for impression cylinder cleaning because there was no mechanism for escaping the claws of the impression cylinder. It is proposed to use a cam plate to avoid contact between the claws and the cleaning cloth of the cleaning unit.

(2) is based on the same problem awareness as in (1) above, and is a mechanism that separates the cleaning unit from the impression cylinder device at the claw part in order to avoid contact between the claw protruding from the impression cylinder surface and the cleaning unit. is proposed.

(3) is based on the same problem awareness as in (1) above, and proposes the use of a cam plate to avoid contact between the claws protruding from the impression cylinder surface and the cleaning cloth, and further,
In addition to the blade, the mechanism for pressing the cleaning cloth against the impression cylinder includes a blade so that a part of the cleaning cloth pressed by the blade is in arcuate contact between the blade and the guide part along the impression cylinder surface. It is proposed to provide a guide section on the cleaning cloth take-up roll side.

[Problem to be solved by the invention]

An outline of the operation of the above-mentioned prior art will be explained with reference to FIGS. 9 to 12. FIG. 9 is a diagram showing the claw part avoidance operation of the conventional cylinder cleaning device, FIG. 10 is a diagram showing the return start operation to the pressure contact position of the conventional cylinder cleaning device immediately after passing the claw part in FIG. 9, and FIG. FIG. 12 is a diagram showing the operation of the conventional device during return to the pressure contact position, and FIG. 12 is a diagram illustrating the state in which an unwiped residue is left on the rear edge of the claw portion of the conventional device shown in FIG. 9.

In these figures, 2 is the side plate of the impression cylinder cleaning device 8 as a cleaning unit, 4 is the impression cylinder to be cleaned, 4a is the impression cylinder recess, and 6a is fixed to the claw shaft 6b near the front edge 4b of the impression cylinder recess. The claw is rotatable around the shaft 6b and clamps and fixes the edge of the sheet between the claw and the surface of the impression cylinder 4. 10a is a pressure blade that presses the cleaning cloth 20 against the outer peripheral surface of the impression cylinder 4. Front frame, 10
b is the pressure welding blade rear frame, 12 is the pressure welding blade 10
14 is a cleaning cloth supply roll, 16 is a cleaning cloth take-up roll, 18 is a cleaning cloth guide rod, and 54 is an impression cylinder 4 of the impression cylinder cleaning device 8. This is a reciprocating guide that guides reciprocating motion in the radial direction.

When a well-known claw position detection means (not shown here) detects the approach of the claw 6a, based on the result,
As shown in FIG. 9, the impression cylinder cleaning device 8 is temporarily removed from the outer peripheral surface of the impression cylinder 4 along the reciprocating guide 54.

When the impression cylinder 4 rotates in the direction of the arrow and the pawl 6a passes just in front of the pressure blade front frame 10a, the impression cylinder cleaning device 8 starts returning to the pressure contact position, as shown in FIG.

Then, as shown in FIG. 11, the pressure welding blade front frame 10a approaches the outer peripheral surface of the impression cylinder 4, grazing the tip of the claw 6a, and as shown in FIG.
The cleaning cloth 20 is brought into pressure contact with a position 1 apart from the tip of the cylinder 4, and cleaning of the outer circumferential surface of the impression cylinder 4 is started.

In this way, in the conventional impression cylinder cleaning device,
Even if the return operation of the impression cylinder cleaning device is started immediately upon detecting the passage of the tip of the claw, there is a drawback that there is a residue left on the outer peripheral surface of the impression cylinder behind the claw, which stains the printing paper.

On the other hand, if the pressure welding blade is returned too quickly, the front frame 10a of the pressure welding blade and the cleaning cloth 20 will collide with the claw 6a, and the provision of a mechanism for avoiding the claw 6a will be meaningless.

This unwiped length l tends to be longer as the thickness t of the claw 6a is thicker and as the rotational speed of the impression cylinder 4 is higher.

An object of the present invention is to avoid collision or contact with claws that protrude beyond the outer peripheral surface in order to grasp the ends of sheet-like members such as sheets of paper, while also not leaving behind the portion of the outer peripheral surface of the cylinder immediately behind the claws. It is an object of the present invention to provide a cylinder cleaning device for a sheet-fed printing press that can be cleaned with ease.

[Means to solve the problem]

In order to achieve the above object, the present invention has claws that protrude from the outer circumferential surface in order to grasp the ends of sheet-like members such as sheets of paper, and in order to avoid the claws of a rotating cylinder, the present invention In a cylinder cleaning device for a sheet-fed printing press that includes a cleaning unit that is once detached from the outer circumferential surface of the cylinder and then is pressed against the outer periphery to clean dirt after the claw has passed, the cleaning unit that is once detached from the outer circumferential surface of the cylinder is removed after the claw has passed. The purpose of the present invention is to propose a cylinder cleaning device for a sheet-fed printing press that is equipped with means for following the rotational direction of the cylinder until it comes into contact with the tip of the cylinder and pressing the cylinder against the outer circumferential surface.

Specifically, the means for causing the cleaning unit to follow the rotational direction of the cylinder is to rotate the cleaning unit in an arc around a cleaning unit support shaft parallel to the central axis of the cylinder as a fulcrum and press it against the outer peripheral surface of the cylinder. Alternatively, it is a mechanism for separating from the outer peripheral surface.

The means for causing the cleaning unit to follow the rotational direction of the cylinder includes a mechanism for advancing or retracting the cleaning unit in the radial direction of the cylinder, and a mechanism for advancing or retracting the cleaning unit toward the tip of the claw in a direction crossing the radial direction. Alternatively, the cleaning unit may be brought into pressure contact with the outer circumferential surface of the cylinder or detached from the outer circumferential surface of the cylinder.

[Effect]

In the present invention, the cleaning unit, which has been temporarily detached from the outer circumferential surface of the cylinder, is made to follow the direction of rotation of the cylinder until it comes into contact with the tip of the claw after passing through the claw, and is brought into pressure contact with the outer circumferential surface. Cleaning can be started from the outer circumferential surface of the cylinder immediately after, and no residue is left behind.

The means for making the cleaning unit follow the rotational direction of the cylinder is to rotate the cleaning unit in an arc around the cleaning unit support shaft parallel to the central axis of the cylinder, and to bring it into pressure contact with the outer circumferential surface of the cylinder or to separate it from the outer circumferential surface. let

An outline of the operation of the cylinder cleaning device of the present invention will be explained with reference to FIGS. 5 to 8. FIG. 5 is a diagram showing the claw part avoidance operation of the cylinder cleaning device of the present invention, and FIG.
Figure 5 shows the operation of the device returning to the pressure contact position immediately after passing the claw portion, Figure 7 shows the operation of the device shown in Figure 5 during return to the pressure contact position, and Figure 8 shows the operation of the device returning to the pressure contact position.
FIG. 6 is a diagram showing a state in which the cleaning device follows the claw portion to a position where the cleaning cloth comes into contact with the rear edge of the claw portion of the device. Note that the same symbols are attached to the parts that perform the same functions as those of the conventional example shown in FIG. 9 and subsequent figures, and the explanation thereof will be omitted.

The cylinder (impression cylinder) cleaning device shown in FIG. 5 is rotatably mounted around a rotating shaft 24. As shown in FIG.

Although not shown here, when the claw 6a approaches the well-known claw position release means, the impression cylinder cleaning device 8
As shown in FIG. 5, the roller rotates around the rotating shaft 24 and is temporarily separated from the outer circumferential surface of the impression cylinder 4. As shown in FIG.

When the impression cylinder 4 rotates in the direction of the arrow and the claw 6a passes just in front of the pressure welding blade front frame 10a, the impression cylinder cleaning device 8 rotates around the rotating shaft 24 and returns to the pressure contact position, as shown in FIG. Start.

Then, as shown in FIG. 7, the impression cylinder cleaning device 8
When the press blade rotates from position A to position B, the pressure welding blade front frame 10a approaches the outer peripheral surface of the impression cylinder 4, grazing the tip of the claw 6a, and places the cleaning cloth 20 at a position some distance from the tip of the claw 6a. bring into contact.

In the present invention, as shown in FIG. 8, the impression cylinder cleaning device 8 rotates around the rotating shaft 24 to the position C, and the cleaning cloth 2 at the front end of the pressure welding blade front frame 10a
0 follows the claw 6a and comes into contact with the rear end of the claw 6a, and cleaning of the outer circumferential surface of the impression cylinder 4 is started from that position.

Therefore, unlike the conventional method, there is no unwiped portion with a length l.

The means for causing the cleaning unit to follow the rotational direction of the cylinder moves the cleaning unit forward or backward in the radial direction of the cylinder, and in parallel, moves the cleaning unit forward or backward in a direction intersecting the radial direction toward the tip of the nail. The cleaning unit may be brought into pressure contact with the outer circumferential surface of the cylinder or detached from the outer circumferential surface of the cylinder.

In this case, the angle of the intersection does not necessarily have to be a right angle, but rather it is preferable that the guide be oblique in the direction of following the tip of the nail.

〔Example〕

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 4 of the drawings. FIG. 1 is a side view showing the related mechanical parts of an embodiment of the cylinder cleaning device for a sheet-fed printing press according to the present invention in a state in which the claws are avoided during cleaning operation, and FIG. 2 is a side view of the device shown in FIG. 1 during cleaning operation. Fig. 3 is a plan view showing the area around the rotation axis of the impression cylinder cleaning device of the apparatus shown in Fig. 1, and Fig. 4 shows the lever rotation axis of the apparatus shown in Fig. 1. FIG. 3 is a plan view showing the surrounding parts expanded. In these figures, parts that perform the same functions as those in the examples of FIGS. 5 to 12 are given the same symbols, and their explanations will be omitted.

Now, in FIGS. 1 to 4, 3 is an intermediate cylinder rotating in the opposite direction to the impression cylinder 4, 22 is a printing press main body frame, and 24a is an impression cylinder cleaning device rotating shaft 24 attached to the printing press main body frame 22. A washer for mounting, 24b is the bearing of the rotating shaft 24, 26 is the rotating shaft 3
6, and the pressure cylinder cleaning device 8 is connected to the rotating shaft 24.
30 is a cam roller that comes into contact with a cam 50 attached to the lever 26 (described later) by a pin 28 and rotates the lever 26 according to the position of the claw 6a; 34 is a cam roller that rotates the lever 26 by a pin 32;
A link 40 connects the head 44 to the lever 2 through the pin 38 and transmits the movement of the lever 26 to the side plate 2 of the impression cylinder cleaning device 8.
a spring fitted around a rod 42 connected to one end of 6 and maintained in a compressed state by a spring receiver 46;
A cam 50 is fixed to the intermediate cylinder 3 by a bolt 52, and the cam roller 30 abuts against the cam crest 50a or the cam trough 50b. In addition, 36
A is a washer for attaching the lever rotation shaft 36 to the printing press body frame 22, and 36b is a bearing for the lever rotation shaft 36.

In this embodiment having such a configuration, the intermediate cylinder 3 and the impression cylinder 4 rotate in synchronization, and the cam roller 30 attached to one end of the lever 26 moves against the cam crest 50 of the cam 50.
When the user rides on a, the lever 26 rotates clockwise. This movement is transmitted to the side plate 2 via the link 34, and the impression cylinder cleaning device 8 is moved to the rotation shaft 24.
The tip of the pressing blade 10 and the cleaning cloth 20 are once removed from the outer circumferential surface of the impression cylinder 4 and retracted from the passage area of the claw 6a.

When the intermediate cylinder 3 and the impression cylinder 4 further rotate, one cam roller 30 of the lever 26 falls from the cam crest 50a of the cam 50 to the cam trough 50b. During this process, the lever 26 rotates counterclockwise, so
The impression cylinder cleaning device 8 rotates clockwise around the rotating shaft 24 to bring the pressure blade 10 and the cleaning cloth 20 into contact again with the outer surface of the impression cylinder 4 after the claw 6a has passed.

At this moment, there is a gap between the tip of the claw 6a and the cleaning cloth 20 at the tip of the pressure blade front frame 10a, but in the present invention, as shown in FIG. Since the impression cylinder cleaning device 8 follows the rotational direction of the impression cylinder 4 until it comes into contact with the claw 6a,
There will be no residue left behind the tip of the wiper.

Therefore, it is possible to prevent the printing paper from becoming dirty due to dirt left unwiped in this area.

In this embodiment, the cam ridge portion 50 of the cam 50
a is a pawl position detection means for mechanically detecting the position of a pawl 6a attached to the front edge 4b of the recess of the impression cylinder 4 rotating in synchronization with the intermediate cylinder 3, as the rotation angle of the intermediate cylinder 3; However, as this detection means, a proximity sensor, a limit switch, an optical sensor, etc. can also be used.

Furthermore, the cam 50 and the cam roller 30 provide
Although a means for causing the impression cylinder cleaning device 8 to follow the rotational direction of the impression cylinder (cylinder) 4 is configured, this part can also be replaced with an electromagnetic actuator or an air cylinder activated by signals from the above-mentioned sensors. It is.

FIG. 13 shows another embodiment of the present invention. In the above embodiment, an example was explained in which the impression cylinder cleaning device 8 is rotated around the rotating shaft 24 to follow the tip of the claw 6a on the outer peripheral surface of the impression cylinder 4. In addition to the mechanism for advancing or retracting the cleaning device 8, that is, the mechanism for moving the impression cylinder cleaning device 8 along the reciprocating guide 54, the mechanism for moving the impression cylinder cleaning device 8 forward or backward toward the claw 6a moving away from the impression cylinder cleaning device 8 in a direction intersecting this radial direction If a cross guide 55 for retracting is provided and is made to follow the tip of the claw 6a, the claw 6a will move as in the previous embodiment.
It is possible to clean the outer circumferential surface of the cylinder immediately after the tip a without leaving any residue.

The intersection does not necessarily have to be orthogonal,
Rather, it is preferable that the claws 6a be inclined in the direction in which the claws 6a move away from each other.

Although the present invention has been described using an impression cylinder as an example of a cylinder, the present invention is applicable to any rotating cylinder that has claws that protrude from the outer circumferential surface in order to grasp the end of a sheet-like member. Can be widely applied to cylinders.

〔Effect of the invention〕

According to the present invention, while avoiding collision or contact with the claws that protrude beyond the outer circumferential surface of the cylinder in order to grasp the ends of sheet-like members such as sheets of paper, the portion of the outer circumferential surface of the cylinder immediately behind the claws can also be grasped. A cylinder cleaning device for a sheet-fed printing press that can be cleaned without leaving any residue is obtained.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the related mechanical parts of an embodiment of the cylinder cleaning device for a sheet-fed printing press according to the present invention in a state in which the claws are avoided during cleaning operation, and FIG. 2 is a side view of the device shown in FIG. 1 during cleaning operation. Fig. 3 is a plan view showing the area around the rotation axis of the impression cylinder cleaning device of the apparatus shown in Fig. 1, and Fig. 4 shows the lever rotation axis of the apparatus shown in Fig. 1. FIG. 5 is a diagram showing the surrounding parts expanded in plan, FIG. 5 is a diagram showing the claw part avoidance operation of the cylinder cleaning device of the present invention, and FIG. 6 is a diagram showing the return of the device to the pressure contact position immediately after passing the claw part. FIG. 7 is a diagram showing the starting operation, FIG. 7 is a diagram showing the operation during the return of the device to the pressure position shown in FIG. 5, and FIG. 8 is a diagram showing the cleaning device as shown in FIG. Figure 9 shows a state in which the claw is tracked, Figure 9 shows the claw avoidance operation of the conventional cylinder cleaning device, and Figure 10 shows the operation of the conventional device to return to the pressure position immediately after passing the claw. FIG. 11 is a diagram showing the operation of the conventional device shown in FIG. 9 during return to the pressure contact position, FIG. 12 is a diagram showing the state in which an unwiped portion is left on the rear edge of the claw part of the conventional device shown in FIG. 9, FIG. 13 is a diagram showing another embodiment of the present invention. 2... Side plate, 3... Intermediate body, 4...
Impression cylinder, 4a...Impression cylinder recess, 4b...Recess front edge, 6
a...claw, 6b...claw shaft, 8...impression cylinder cleaning device,
10a... Pressure blade front frame, 10b... Pressure blade rear frame, 12... Pressure pad, 14... Cleaning cloth supply roll, 16... Cleaning cloth winding roll, 18
... Guide rod, 20 ... Cleaning cloth, 22 ... Printing machine main body frame, 24 ... Impression cylinder cleaning device rotation shaft, 2
4a...Washer, 24b...Bearing, 26...Lever, 28, 32, 38, 48...Pin, 30...
Cam roller, 34...Link, 36...Lever rotating shaft, 36a...Washer, 36b...Bearing, 40...
Spring, 42... Rod, 44... Rod head, 4
6... Spring holder, 50... Cam, 50a... Cam peak, 50b... Cam valley, 52... Bolt, 54
... Reciprocating guide, 55... Crossing guide.

Claims (1)

[Scope of Claims] 1. The cylinder has claws that protrude beyond the outer circumferential surface for gripping the edges of a sheet-like member such as a sheet of paper, and is temporarily detached from the outer circumferential surface in order to avoid the claws of a rotating cylinder. The cleaning unit includes a cleaning unit that is pressed against the outer circumferential surface after the pawl has passed and cleans dirt therefrom, and the cleaning unit has a pressure pad that presses a cleaning cloth against the outer circumferential surface of the cylinder and a pressure blade that holds the pressure pad. In the cylinder cleaning device for a paper printing press, the device causes the cleaning unit, which is temporarily detached from the outer peripheral surface of the cylinder, to follow the rotational direction of the cylinder until it comes into contact with the tip of the pawl after passing the pawl. The cleaning unit has means for pressing against the outer circumferential surface of the cylinder, and the means rotates the cleaning unit in an arc around a cleaning unit support shaft parallel to the central axis of the cylinder to press the cleaning unit against the outer circumferential surface of the cylinder. A cylinder cleaning device for a sheet-fed printing press, characterized in that it is a mechanism for separating from the outer peripheral surface. 2. In order to avoid the claws of a rotating cylinder that has claws that protrude beyond the outer circumferential surface in order to grip the edges of a sheet-like member such as a sheet of paper, the cylinder is temporarily separated from the outer circumferential surface and after the claws have passed. A cylinder of a sheet-fed printing press, including a cleaning unit that is pressed against the outer circumferential surface and cleans dirt therefrom, the cleaning unit having a pressure pad that presses a cleaning cloth against the outer circumferential surface of the cylinder, and a pressure blade that clamps the pressure pad. In the cleaning device, the device includes means for causing the cleaning unit, which has been temporarily detached from the outer circumferential surface of the cylinder, to follow the rotational direction of the cylinder until it comes into contact with the tip of the claw after passing through the claw, and to press the cleaning unit against the outer circumferential surface. The means includes a mechanism for advancing or retracting the cleaning unit in a radial direction of the cylinder, and a mechanism for advancing or retracting the cleaning unit toward the tip of the claw in a direction crossing the radial direction. Become,
A cylinder cleaning device for a sheet-fed printing press, characterized in that the cleaning unit is a mechanism for bringing the cleaning unit into pressure contact with the outer circumferential surface of the cylinder or for separating it from the outer circumferential surface.