JPH0453705B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cylinder cleaning device for a printing press.
In particular, it relates to a safety mechanism of a cleaning cloth feeding device of an automatic cleaning device that presses a common cleaning cloth against the outer circumferential surface of a bracket cylinder and an impression cylinder of an offset printing machine or a plurality of adjacent cylinders by respective pressing means to clean the cylinders. It is something.

[Conventional technology]

In conventional offset printing machines, when printing continues for a certain period of time, ink, paper dust, etc. adhere to the surfaces of the bracket cylinder and the impression cylinder, causing them to become dirty. If this dirt is transferred to the printing press, it will stain the printed matter.

For this reason, automatic cleaning devices for cleaning the surfaces of the bracket cylinder and the impression cylinder have been developed with respective functions.

An example of the prior art related to a sheet-fed printing press will be described with reference to FIGS. 8 and 9. In Fig. 8, 1 is the plate cylinder, 1A is the plate cylinder gap, 2 is the blanket cylinder, 2A is the blanket cylinder gap, 3
is an impression cylinder, and 3A is an impression cylinder gap. Although not shown here, the plate cylinder gap 1A has a clamp for fixing the plate, the blanket cylinder gap 2A has a clamp for fixing a (rubber) blanket, and the impression cylinder gap 3A has a clamp for fixing the plate to be printed. Clamps are provided for fixing the sheet stamps. In this prior art example, the diameter of the impression cylinder 3 is twice that of the plate cylinder 1 and the blanket cylinder 2. A cylinder cleaning device 10A is installed on the blanket cylinder 2 and the impression cylinder 3.
and 10B are provided facing each other on their outer surfaces.

FIG. 9 is a perspective view showing the structure of the cylinder cleaning device 10B. In the figure, 60A and 60
B is a side plate, 61 is a cloth supply roll, 62
63 is a cleaning cloth fed out from the cloth supply roll 61 and wound around the cloth take-up roll 62; 65 is a stay fixed to the side plates 60A, 60B; It is a pressure pad that is pressed against the

That is, one cleaning cloth supply roll 6 is placed between a pair of side plates 60A and 60B attached to side frames on both sides of the printing press main body (not shown).
1 and a cleaning cloth take-up roll 62 are rotatably supported parallel to the axial center line of the impression cylinder 3. A predetermined tension is applied to the cleaning cloth 63 suspended between these rolls.

The cleaning cloth take-up roll 62 is, for example, a
As described in Publication No. 37069, the drive device allows
It is rotated intermittently (for example, once every 3 seconds) or continuously at a predetermined speed. In a sheet-fed printing press such as this example, the cleaning cloth 63 is placed at a position corresponding to the blanket cylinder gap 2A and the impression cylinder gap 3A.
is wound up, and the pressure pads 66A, 66B are pushed out toward the blanket cylinder 2 and the impression cylinder 3, respectively, at positions other than the gap 2A, 3A.
A cleaning cloth 63 located on the outer circumferential surface of the cylinder 2 and 3 is pressed against each cylinder 2 and 3 for cleaning.

[Problem to be solved by the invention]

In conventional devices, the direction in which the cleaning cloth is wound up, that is, the direction in which the cleaning cloth travels, is opposite to the direction in which the surface of the cylinder being pressed travels.

One of the reasons for this is that when the dirty part of the cleaning cloth is moved in the direction of movement of the cylinder surface, some of the dirt on the cleaning cloth surface is transferred to the cylinder surface again, and the dirt remains on the cylinder surface forever.
Another reason is that by reversing the advancing direction of the cylinder surface and the rotating direction of the cleaning cloth supply roll, the cleaning cloth is prevented from moving as the cylinder rotates.
The cleaning cloth is correctly unwound from the cleaning cloth supply roll only when the cleaning cloth take-up roll is driven.

Generally, two adjacent cylinders of an offset printing press, for example a blanket cylinder and an impression cylinder, are driven so that the cylinder surfaces move in the same direction without slipping relative to each other. Therefore, the rotation directions of both cylinders are opposite. Therefore, in the blanket cylinder cleaning device and the impression cylinder cleaning device, the driving direction of the cleaning cloth take-up roll must be reversed, as shown in Fig. 8, and a dedicated cleaning device is required for each. It was considered impossible to use one automatic cleaning device for both the blanket cylinder and the impression cylinder.

As a result, there was a problem in that the cost of the device was equivalent to that of two devices.

In addition, depending on the model, the installation space is so small that it is actually impossible to install two cleaning devices, and even if they are installed forcibly, the workability of the printing press will be significantly impaired. It was hot.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cylinder cleaning device for a printing press that is capable of handling a plurality of adjacent cylinders that rotate in opposite directions.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention presses a cleaning cloth fed out from a cleaning cloth supply roll and suspended between a cloth supply roll and a cloth take-up roll against the outer periphery of a cylinder of a printing press by a pressing means. In a cylinder cleaning device of a printing press for surface cleaning, a pressing means is attached to a single cleaning unit of said cylinder cleaning device to apply a series of cleaning cloths, i.e. one common cleaning cloth, to different positions or a plurality of positions on the cylinder. This invention proposes a cylinder cleaning device for a printing press that is configured with a plurality of pressing means that press against the cylinder.

The plurality of cylinders are adjacent to each other and include a first cylinder that rotates in the opposite direction to the direction in which the cleaning cloth is fed out, and a second cylinder that rotates in the same direction as the direction in which the cleaning cloth is fed out, and the pressing means is the first cylinder and the second cylinder. In the cylinder cleaning device of a printing press, which is provided facing each cylinder, has a cloth take-up roll having a driving means, and which cleans the cylinder surface by drawing out the cloth from the cloth supply roll by the cloth take-up roll driving means. A cleaning cloth supply roll rotation prevention mechanism is provided which prohibits cleaning cloth from being fed out from the cleaning cloth supply roll at times other than the cloth feeding time.

The cleaning cloth rotation prevention mechanism includes, for example, a ratchet wheel attached to the shaft end of the cleaning cloth supply roll, a pawl that escapes from the ratchet wheel, and a pawl that engages with the ratchet wheel except for a predetermined cloth feeding time. It consists of an actuator that causes

The cleaning cloth rotation prevention mechanism can also be configured with a disk brake that presses and separates the rotating side disk attached to the shaft end of the cleaning cloth supply roll and the stationary side disk attached to the side plate of the cylinder cleaning device. .

This disc brake may be an electromagnetic brake or a mechanical brake.

In either case, it is possible to provide means for locking or releasing the cleaning cloth supply roll rotation prevention mechanism in synchronization with the rotation of the cylinder.

[Effect]

The general operation of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a diagram showing an example of the arrangement of printing units of an offset sheet-fed printing press. In the following description, in order to avoid duplication, parts that perform the same functions as those of the conventional example shown in FIGS. 8 and 9 are given the same reference numerals, and the description thereof will be omitted. In FIG. 1, 4 is an inking device that supplies ink to the plate cylinder 1, 5 is a dampening water device that supplies dampening water, and 10 is a cylinder cleaning device according to the present invention. In this case as well, the diameter of the impression cylinder 3 is twice the diameter of the plate cylinder 1 and the blanket cylinder 2, but the invention is not limited to this magnification. Furthermore, the application of the present invention is limited to offset sheet-fed printing presses.
It can also be easily applied to offset rotary printing presses.

Now, FIG. 2 is a diagram showing the positional relationship between the cylinder and the pressure pad during cleaning, and FIG. 3 is a diagram showing the positional relationship between the cylinder and the cleaning device when feeding the cleaning cloth.

At the time of cleaning shown in FIG. 2, the cleaning cloth 63
is pressed against the surfaces of the blanket cylinder 2 and the impression cylinder 3 by the pressure pads 66A, 66B to clean these surfaces. At this time, since the rotation prevention mechanism of the cleaning cloth supply roll 61 is activated, the cloth 63 is not pulled out from the cloth supply roll 61 even if the impression cylinder 3 rotates in the direction B.

The cylinders further rotate from this state, and a signal from the detector that detects the rotation angle of each cylinder indicates that the pressure pad and the gap have come to a position where they face each other as shown in Figure 3. When shown, the rotation prevention mechanism of the cleaning cloth supply roll 61 is released in response to the detection signal, and the cleaning cloth supply roll 61 becomes free to rotate.

Therefore, the cleaning cloth 63 is wound up by a predetermined amount by means of driving the cloth winding roll 62.

When a predetermined amount of cloth winding operation is completed, a signal is output from a control mechanism (not shown), and in response to this signal, the rotation prevention mechanism of the cloth supply roll is restored to its original state to prevent the cloth from unraveling during cleaning. Make it possible to continue.

Afterwards, this operation is repeated while the cylinder cleaning work continues.

In the present invention, since the drive mechanism for the cloth take-up roll 62 is equipped with a one-way clutch or the like, the cleaning cloth 63 will not come undone from the cloth take-up roll 62 in the direction of rotation of the blanket body 2. Furthermore, by providing the cloth supply roll 61 with a rotation prevention mechanism, the cleaning cloth 6 can be rotated according to the rotation of the impression cylinder 3.
The danger of 3 coming undone has also been eliminated.

Although there is a possibility that the part of the surface of the blanket cylinder 2 that has been cleaned once can be used to clean the surface of the impression cylinder 3, it has traditionally been common to use the cleaning cloth that has been used once at least once again. Therefore, there is no problem in terms of cleaning capacity.

In addition, a plurality of pressing means are provided to press the cleaning cloth suspended between one cleaning cloth supply roll and one cloth take-up roll to different positions of the cylinder, so that, for example, the blanket cylinder and the impression cylinder can be pressed. It can be used for both purposes, which is advantageous in terms of space, cost, and reduction in cleaning cloth consumption.

In particular, by providing a cleaning cloth supply roll rotation prevention mechanism that prohibits the cleaning cloth from being fed out from the cleaning cloth supply roll outside of the predetermined cloth feeding time, it is possible to prevent two cleaning cloths, such as a blanket cylinder and an impression cylinder, from being washed at the same time. Even if the direction of rotation of the cylinder is reversed, problems such as the cloth being pulled out and getting tangled will not occur.

〔Example〕

Next, an embodiment of the present invention will be described with reference to FIGS. 4 to 7.

FIG. 4 is a side view showing the configuration of an embodiment of the cylinder cleaning device according to the present invention, FIG. 5 is a front view showing the configuration of the device shown in FIG. Side view showing an example of the mechanism, seventh
The figure is a diagram showing the state of the apparatus shown in FIG. 4 when the cloth is fed out.

In these figures, as already mentioned, 10 indicates the cylinder cleaning device as a whole, and in this case, one cylinder cleaning device 10 is arranged so as to face both the blanket cylinder 2 and the impression cylinder 3. ing. Side plates 60A, 60B
is equipped with the following mechanisms: The rotation prevention mechanism of the cleaning cloth supply roll 61 mainly includes a ratchet wheel 30 fixed to the shaft 61A of the cloth supply roll 61, a claw 31 that can be removed from the ratchet wheel 30, and an actuator (air cylinder) 36. It is a constituent element. The spring 32 is installed between the spring base 34 and the spring receiver 35, and normally applies force in a direction to cause the claw 31 to escape from the ratchet wheel 30. In addition, 37 is the rod of the air cylinder 36, and 38 is the air cylinder 36.
It is a bracket that fixes the

The side plates 60A, 60B are spacers 4
1 and bolts 42 to the side frames 90A and 90B of the printing press at multiple positions.

The other end 61B of the cloth supply roll 61 is provided with an empty feed prevention mechanism that provides an appropriate amount of friction in order to prevent the cloth supply roll, which becomes free when the cloth is fed out, from feeding out more cloth than necessary and causing the cleaning cloth to become loose. It is being For example, as shown in FIG. 6, this dry feed prevention mechanism has a fixed end 84 rotatably fixed to a stud 85 and a shaft end 6 of the fabric supply roll.
It consists of a brake band 83 in sliding contact with 1B and a tension spring 87 pulling its free end 86.

In addition, 77A, 77B, 78 are cleaning cloth guide rollers, 81A, 81B are one-way clutches, 82
A and 82B are bearings.

The operation of this embodiment configured as described above will be explained next.

In the state shown in FIG. 4 during cleaning, the actuator 36 is biased in the X direction, so the pawl 31 remains locked on the ratchet wheel 30, and the cleaning cloth 63 is unwound from the cleaning cloth supply roll 61. do not have. Therefore, the surface of the blanket cylinder 2, which rotates in the direction A in FIG. 4, is cleaned while maintaining the conventional relationship in the opposite direction. On the other hand, although the direction of rotation (direction B) of the impression cylinder 3 coincides with the direction of feeding out the cloth, since the rotation prevention mechanism of the cleaning cloth supply roll 61 is in a locked state, no problem occurs. In the end, pressure pads 66A and 66
With the cleaning cloth 63 stretched between the
The surface of the impression cylinder 3 is also cleaned.

As the rotation of the cylinder progresses, a signal from a cylinder rotation angle detection means (not shown) (specifically, any of various detection means such as a rotary encoder, a proximity switch, a photoelectric switch, a limit switch, etc.) may be used. When it is transmitted that the pressure pad has reached the gap of each cylinder, the air cylinder 36 moves to Y as shown in FIG.
direction, and due to the action of the spring 32, the claw 31
escape from the ratchet wheel 30. In this state, the cloth winding roll 62 is driven by a drive means (not shown), and the cleaning cloth is wound up by a predetermined amount in the direction C in FIG. 7 in preparation for cleaning. In this case, in the offset sheet-fed printing press, the pressure pad 66A,
The part 66B faces the gap of each cylinder and is no longer constrained by each cylinder, but the dry feed prevention mechanism shown in Fig. 6 provides an appropriate amount of friction, so the cleaning cloth is It is unrolled by a predetermined amount and does not come loose. Therefore, the next cleaning will also start normally.

According to this embodiment, it is possible to obtain a cylinder cleaning device capable of simultaneously cleaning a blanket cylinder and an impression cylinder without causing slack in the cleaning cloth fed out from one cloth supply roll.

In addition, here, an example was shown in which cleaning is performed by pressing the cleaning cloth against each cylinder using one pressing means, but it is also possible to use a plurality of pressing means facing each cylinder,
The cleaning efficiency may be increased.

Furthermore, the cleaning cloth supply roll rotation prevention mechanism is not limited to the combination of a ratchet wheel, pawl, and its actuator, but can also be realized by, for example, an electromagnetic brake formed between the cleaning cloth supply roll and the side plate of the cylinder cleaning device. It is possible.

〔Effect of the invention〕

According to the present invention, it is possible to obtain a cylinder cleaning device for a printing press that can be used in one unit to clean a plurality of adjacent cylinders that rotate in opposite directions.

Therefore, it is possible to reduce the installation space and cost of the cylinder cleaning device and improve operability.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the arrangement of printing units of an offset sheet-fed printing press, and FIG. 2 is a diagram showing the approximate positional relationship between the cylinder gap and the pressure pad during cleaning by the cylinder cleaning device of the present invention. FIG. 3 is a diagram showing the general positional relationship between the cylinder gap and the pressure pad when the cleaning cloth is fed out, FIG. 4 is a side view showing the configuration of an embodiment of the cylinder cleaning device according to the present invention, and FIG. 5 4 is a front view showing the configuration of the device viewed from the negative direction, FIG. 6 is a diagram showing an example of the configuration of the dry feed prevention mechanism, and FIG. 7 is a diagram showing the state of the device shown in FIG. 4 when the cloth is fed out. , FIG. 8 shows an example of a conventional cylinder cleaning device in which a cleaning unit is provided corresponding to each cylinder, and FIG. 9 shows the relationship between one cylinder and its cleaning unit in the conventional example shown in FIG. 8. FIG. 1... Plate cylinder, 1A... Plate cylinder gap, 2... Blanket cylinder, 2A... Blanket cylinder, 3...
Impression cylinder, 3A... impression cylinder gap, 4... inking device, 5... dampening water device, 10... cylinder cleaning device, 30... ratchet wheel, 31... pawl, 32... spring, 33... ...shaft, 34... spring stand, 35... spring receiver, 36... actuator (air cylinder),
37...rod, 38...blanket, 41...
...Spacer, 42...Bolt, 60A, 60B...
...Side plate, 61...Fabric supply roll, 61
A...shaft, 62...cloth winding roll, 62A...
...Shaft, 63...Cleaning cloth, 65...Stay, 66
A, 66B...Pressure pad, 81A, 8
1B...One-way clutch, 82A, 82B...
...Bearing, 83...Brake band, 84...
... fixed end, 85 ... stud, 86 ... free end,
87...Tension spring, 90A, 90B...Printing machine side frame.

Claims (1)

[Scope of Claims] 1. Cleaning the surface of the cylinder by pressing the cleaning cloth fed out from the cleaning cloth supply roll and suspended between the cloth supply roll and the cloth take-up roll against the outer periphery of the cylinder of the printing press by a pressing means. In a cylinder cleaning device for a printing press, the pressing means is attached to a single cleaning unit of the cylinder cleaning device and comprises a plurality of pressing means for pressing a series of the cleaning cloths at different positions of the cylinder or against a plurality of cylinders. A printing press cylinder cleaning device characterized by: 2. The plurality of cylinders are adjacent to each other and include a first cylinder that rotates in a direction opposite to the direction in which the cleaning cloth is fed out, and a second cylinder that rotates in the same direction as the direction in which the cleaning cloth is fed out, and the pressing means 1 cylinder and the second cylinder, respectively, the cloth take-up roll has a driving means, and the cloth is drawn out from the cloth supply roll by the cloth take-up roll driving means to clean the cylinder surface. The cylinder cleaning device for a printing press according to claim 1, further comprising a cleaning cloth supply roll rotation prevention mechanism that prohibits cleaning cloth from being fed out from the cleaning cloth supply roll outside of a predetermined cloth feeding time. Machine cylinder cleaning device. 3. The cylinder cleaning device for a printing press according to claim 2, wherein the cleaning cloth supply roll rotation prevention mechanism includes a ratchet wheel attached to a shaft end of the cleaning cloth supply roll;
A cylinder cleaning device for a printing press, comprising a pawl that engages and disengages the ratchet wheel, and an actuator that engages the pawl with the ratchet wheel at times other than the predetermined cloth feeding time. 4. The cylinder cleaning device for a printing press according to claim 2, wherein the cleaning cloth supply roll rotation prevention mechanism is attached to a rotation side disk attached to an axial end of the cleaning cloth supply roll and a side plate of the cylinder cleaning device. A washing device for a printing press, comprising a disk brake that presses and releases a fixed side disk that has been fixed. 5. The cylinder cleaning device for a printing press according to claim 4, wherein the disc brake is an electromagnetic brake. 6. The cylinder cleaning device for a printing press according to claim 4, wherein the disc brake is a mechanical brake. 7. The cylinder cleaning device for a printing press according to any one of claims 2 to 6, further comprising means for locking or releasing the cleaning cloth supply roll rotation prevention mechanism in synchronization with rotation of the cylinder. Cylinder cleaning equipment for printing presses.