JPH02131942A - Cylinder cleaning device for printer - Google Patents

Abstract

PURPOSE:To cope with a plurality of adjacent cylinders rotating reversibly by one cleaning device by pressing cleaning cloth to the different positions of the cylinders or the plurality of cylinders. CONSTITUTION:Cleaning cloth 63 is pressed to the surfaces of a blanket cylinder 2 and an impression cylinder 3 by pressure pads 66A, 66B to clean the surfaces. Since the rotation preventing mechanism of a cleaning cloth supply roll 61 is operated, even if the cylinder 3 is rotated in a direction (b), the cloth 63 is not pulled out from the roll 61. When the cylinder is further rotated so that a signal from a detector for detecting a rotating angle indicates that the pads 66A, 66B are opposed to gaps 24, 34, the mechanism of the roll 61 is released to become rotatable. Then, the cloth 63 is wound in a predetermined amount by driving means of a cloth winding roll 62. When the winding operation of the predetermined amount is finished, a control mechanism outputs a signal to recover the preventing mechanism of the roll 61 thereby to prevent the cloth from unsewing at the time of cleaning to continue cleaning.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cylinder cleaning device for a printing press, and in particular, to a cylinder cleaning device for a printing press. The present invention relates to a safety mechanism for a cleaning cloth feeding device of an automatic cleaning device that suppresses a common cleaning cloth by a pressing means and cleans a cylinder.

[Conventional technology]

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

Therefore, automatic cleaning devices for cleaning the surfaces of the blanket 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 a plate cylinder, LA is a plate cylinder gap, 2 is a blanket cylinder, 2A is a blanket cylinder gap, 3 is an impression cylinder, and 3A is an impression cylinder gap. Although not shown here, the plate cylinder gap IA has a clamp that fixes the plate, the blanket cylinder gap 2A has a clamp that fixes the (rubber) blanket, and the impression cylinder gap 3A has a clamp that fixes the plate. Clamps are provided for fixing the sheet stamps.

In this conventional example, the diameter of the impression cylinder 3 is twice that of the plate cylinder 1 and the blanket cylinder 2. The blanket cylinder 2 and the impression cylinder 3 are provided with cylinder cleaning devices 10A and 10B 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 60B are side plates, 61 is a cloth supply roll, 62 is a cloth take-up roll,
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 side plate 60A;
, 60B are fixed stays, and 66A is a pressure pad 5 that presses the cleaning cloth 63 against the impression cylinder 3 during cleaning.
That is, a pair of side notebooks 60A, 60 attached to side frames on both sides of the printing press main body (not shown)
Between B, one cleaning cloth supply roll 61 and one 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, manufactured by Japanese Patent Publication No. 56-37.
As described in Japanese Patent Application No. 069, rotational movement is performed by a movement device 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 wound up at a position facing the blanket cylinder gap 2A and the impression cylinder gap 3A, and the cleaning cloth 63 is
Pressure pads 66A, 66 at positions other than A, 3A
By pushing out B toward the blanket cylinder 2 and impression cylinder 3, respectively, the cleaning cloth 63 located on the outer peripheral surface of the pressure pads 66A and 66B is pressed against each cylinder 2 and 3 for cleaning.

[Problem to be solved by the invention]

In conventional devices, the winding direction of the cleaning cloth, that is, the direction of movement of the cleaning cloth is opposite to the direction of movement of the cylinder surface being pressed.

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, and only when the cleaning cloth take-up roll is rotated. In general, the two adjacent cylinders of an offset printing press, such as the blanket cylinder and the impression cylinder, are pressed so that the cylinder surfaces move in the same direction without slipping. be done. 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 Figure 8, and dedicated cleaning devices are required for each. It is necessary to install 1
It was considered impossible to share the automatic cleaning device for the blanket cylinder and impression cylinder.

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

Also, depending on the model, the installation space may be small, and 2
There is a drawback that it is actually impossible to attach a cleaning device to the stand, and even if it is forcibly attached, the workability of the printing press is significantly impaired.

An eleventh object of the present invention is to provide a cylinder cleaning device for a printing press that can be used for cleaning 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 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 a printing press by a pressing means. The present invention proposes a cylinder cleaning device for a printing press that cleans the surface of a printing press, in which the suppressing means is composed of a plurality of pressing means for pressing a cleaning cloth at different positions of the cylinder or against a plurality of cylinders.

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; In a cylinder cleaning device for a printing press, which is provided in two cylinders facing each other, the cloth take-up roll has a moving means, and the cloth is drawn out from the cloth supply roll by the cloth take-up roll movement means to clean the cylinder surface. is equipped with 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.

The cleaning cloth rotation prevention mechanism includes, for example, a ratchet wheel attached to the shaft end of the cloth supply roll, a pawl that engages and disengages from the ratchet wheel, and a mechanism that prevents this pawl from rotating during a predetermined cloth feeding time. and an actuator for engagement.

The cleaning cloth rotation prevention mechanism presses 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 stomach.
Il! It can also be configured with a disc brake that can be released.

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. ], Figure R; 4 is an inking device that supplies ink to the plate cylinder 1; 5 is a dampening water F[
, 10 is a cylinder cleaning device according to the present invention. In this case as well, the diameter of the impression cylinder 3 is . Plate cylinder 1 and blanket cylinder 2
Although the diameter is twice the diameter of the magnification, the present invention is not limited to this magnification. Furthermore, the present invention is not limited to sheet-fed offset printing presses, but can also be easily applied to rotary offset 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.
and is pressed against the surfaces of the impression cylinder 3 to clean these surfaces. At this time, the rotation prevention mechanism of the cleaning cloth supply roll 61 is activated, so even if the impression cylinder 3 rotates in the mouth direction,
The cloth 63 is never pulled out from the cloth supply roll 61.

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

Therefore, the cleaning cloth 63 is wound up by a predetermined amount by the movement means of 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 rotating mechanism of the cloth take-up roll 62 is equipped with a one-way clutch or the like, the cleaning cloth 62
3 will not unravel from the cloth take-up roll 62 in the direction of rotation of the blanket cylinder 2. In addition, the cloth supply roll 61
By providing a rotation prevention mechanism in the rotation prevention mechanism, the danger of the cleaning cloth 63 coming undone as the impression cylinder 3 rotates is also eliminated.

Although it is possible that the part of the surface of the blanket cylinder 2 that has been washed once can be used to clean the surface of the impression cylinder 3, it has not been common practice for children to use the cleaning cloth that has been used once at least once again. Therefore, there is no problem in terms of cleaning capacity.

Also. Since a plurality of suppressing 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, it can be used as both a blanket cylinder and an impression cylinder, for example. This is advantageous in terms of space and cost as well as 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, two cleaning cylinders, such as a blanket cylinder and an impression cylinder, which are to be cleaned at the same time, can be used. 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 in Fig. 4 seen from the V-■ direction, and No. 6 is a waste of cloth. FIG. 7 is a side view showing an example of the feed prevention mechanism, and FIG. 7 is a diagram showing the state of the device shown in FIG. In this case, one cylinder cleaning device 10 cleans the blanket cylinder 2 and the impression cylinder 3.
are arranged so as to face both sides. Side plate 60A. 60B is equipped with the following mechanism. 6 The rotation prevention mechanism of the cleaning cloth supply roll 61 includes a ratchet wheel 30 fixed to the shaft 61A of the cloth supply roll 61, and a pawl that can be engaged and detached from the ratchet 3o. 31 and an actuator (air cylinder) 36 as the main components. The spring 32 is
It 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.

Note that 37 is a rod of the air cylinder 36, and 38 is a bracket for fixing the air cylinder 36.

Sidep Ii h60A, 60B is S/<-S41
and bolts 42 to the side frames 90A, 90B of the printing press at multiple positions.

The other end 61B of the cloth supply roll 61 is provided with a dry-feed prevention mechanism that applies appropriate friction to prevent the cloth supply roll, which becomes free when the cloth is fed out, from feeding out more cloth than necessary and causing slack in the cleaning cloth. It is being For example, as shown in FIG.
4 is rotatably fixed to a stud 85 and slidingly contacts the shaft end 61B of the cloth supply roll, and a tension spring 87 that pulls the free end 86 of the brake band 83.

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

The operation of this embodiment configured in this way 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 is pushed against the ratchet wheel 30
remains locked, and the cleaning cloth 63 is not let out from the cleaning cloth supply roll 61.

Therefore, the plunger cylinder 2 rotates in the direction A in Fig. 4.
The surface is cleaned while maintaining the conventional relationship in the opposite direction. On the other hand, although the rotational direction (mouth direction) of the impression cylinder 3 and the cloth feeding direction are the same, since the rotation prevention mechanism of the cleaning cloth supply roll 61 is in a locked state, no trouble occurs.

In the end, the surface of the impression cylinder 3 is also cleaned with the cleaning cloth 63 stretched between the pressure pads 66A and 66A.

As the rotation of the cylinder progresses, the cylinder rotation angle detection means (not shown) (specifically, any of various detection means such as a rotary encoder, proximity switch, photoelectric switch, limit I-switch, etc.) may be used. By the signal
When it is transmitted that the pressure pad has reached the gap between each cylinder, the air cylinder 36 is biased in the Y direction as shown in FIG.
1 to escape from the ratchet wheel 30. In this state, the cloth winding roll 62 is driven by a movement means (not shown) to wind up a predetermined amount of the cleaning cloth in the direction C in FIG. 7 in preparation for cleaning. In this case, in the offset sheet-fed printing press, the pressure pads 66A and 66B will face the gap between each cylinder, and will no longer be constrained by each cylinder, but this will prevent the blank feed shown in FIG. Since the mechanism provides an appropriate amount of friction, the cleaning cloth is fed out by a predetermined amount without becoming loose.

Therefore, the next cleaning will also start normally.

According to this embodiment, a cylinder cleaning device can be obtained that can simultaneously clean the blanket cylinder and the impression cylinder without causing slack in the cleaning cloth fed out from one cloth supply roll.

Here, an example has been shown in which the cleaning cloth is pressed against each cylinder by one pressing means, but a plurality of pressing means may be arranged to face each cylinder to increase the cleaning efficiency.

In addition, 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. is also 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, 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, and FIG. 4 is a side view showing the configuration of an embodiment of the cylinder cleaning device according to the present invention, and FIG. Figure 6 is a front view showing the configuration of the device as seen from the ■-■ direction, Figure 6 is a diagram showing an example of the configuration of the dry feed prevention mechanism, Figure 7 is a diagram showing the state of the device as shown in Figure 4 when the cloth is fed out, Figure 8 shows an example of a conventional cylinder cleaning device in which a cleaning unit is provided for each cylinder, and Figure 9 shows the relationship between one cylinder and its cleaning unit in the conventional example shown in Figure 8. FIG. 1... Plate cylinder, IA... 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
...Rawl wheel, 31...Claw, 32...Spring, 33...
・Shaft, 34... Spring stand, 35... Spring receiver, 36.
...Actuator (air cylinder), 37...Rod, 38...Bracket 1~, 41...Spacer, 42
...Bolt, 60A, 60B...Side plate,
61... Cloth supply roll, 61A... Shaft, 62...
Cloth winding roll, 62A...shaft, 63...cleaning cloth, 65...stay 66A, 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)

[Claims] 1. A cleaning cloth fed out from a cleaning cloth supply roll and suspended between the cloth supply roll and a cloth take-up roll is pressed against the outer periphery of a cylinder of a printing press by a pressing means, so that the surface of the cylinder is A cylinder cleaning device for a printing press, wherein the pressing means includes a plurality of pressing means for pressing the cleaning cloth at different positions of the cylinder or against a plurality of cylinders. 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; The cloth take-up roll is provided opposite to the first cylinder and the second cylinder, and has a driving means, and the cloth is pulled 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. Printing press 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 the shaft end of the cleaning cloth supply roll, and a pawl that engages and disengages from the ratchet wheel. and an actuator for engaging 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 the shaft end of the cleaning cloth supply roll and a side plate of the cylinder cleaning device. A cleaning device for a printing press, comprising a disc brake that presses and releases an attached stationary disc. 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. Characteristic printing press cylinder cleaning device.