JP2796957B2 - Blanket cleaning equipment for offset printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blanket cleaning apparatus for an offset printing machine, and more particularly, to a cleaning mechanism and a cleaning auxiliary mechanism which are separately provided, and the cleaning is carried out firmly by the former, and by the latter. The present invention relates to a blanket cleaning apparatus capable of collecting unnecessary substances falling from the former and removing unnecessary substances attached to a blanket surface and remaining on the blanket surface.

[0002]

2. Description of the Related Art A mechanism in which a bracket cleaning section is provided substantially parallel to the axis of a blanket cylinder so that the blanket surface can be cleaned by contacting the blanket surface on the outer periphery of the blanket cylinder is disclosed in JP-A-63-288754. JP-A-61-
JP-A-205144 and JP-A-1-128835 are known.

The structure disclosed in Japanese Patent Application Laid-Open No. 63-288754 is composed of a rotatable cloth supply roller having a length substantially parallel to the axis of the blanket cylinder and at least as long as the axial length of the outer peripheral surface of the blanket cylinder. The cloth take-up roller is appropriately supported by the frames on both sides of the printing press, and a belt-shaped cleaning cloth is connected between the cloth supply roller and the cloth take-up roller, and the cloth take-up roller is rotated. Shows a winding mechanism for winding the cleaning cloth. A position at which a pressure pad made of an elastic member having at least the same length as the axial direction of the outer peripheral surface of the blanket cylinder can press the cleaning cloth against the blanket surface of the outer periphery of the blanket cylinder substantially in parallel with the axis of the blanket cylinder. And a mechanism provided with a pressing means for pressing or retracting the pressure pad.

This configuration performs the following operation. That is, by pressing the pressure pad by the pressing means, the belt-shaped cleaning cloth is pressed against the surface of the blanket on the outer periphery of the blanket cylinder. By rotating the blanket cylinder in this state, unnecessary substances attached to the surface of the blanket are wiped off with the belt-shaped cleaning cloth. Then, the cloth take-up roller is intermittently rotated by the take-up mechanism to take up the belt-like cleaning cloth, whereby a new cleaning cloth is supplied to the surface of the bracket. When the blanket cleaning is completed, the pressing of the pressure pad is released, and the cleaning cloth and the pressure pad are separated from the surface of the blanket.

Japanese Patent Application Laid-Open No. 61-205144 discloses a construction in which supporting beams are appropriately attached to frames on both sides of a printing press substantially in parallel with the axis of a blanket cylinder. A brush device having a length at least as long as the axial length of the outer peripheral surface of the blanket cylinder substantially parallel to the axis of the blanket cylinder is attached to the brush holder, and the plurality of brush retainers attached to the support beam are provided. Is mounted rotatably on a rod shaft supported by the bearings. An actuator is appropriately mounted on the support beam, and a cylinder rod of the actuator and the rod shaft are connected via an arm. In addition to this configuration, a housing provided with an opening of a lint (unnecessary object) capturing device having at least the same length as the axial length of the outer peripheral surface of the blanket cylinder substantially in parallel with the axis of the blanket cylinder is provided by the support beam. The housing is supported, and an opening on the blanket side of the housing is provided with a lid which can be opened and closed via a hinge and is connected to the housing. An elastic lip is attached to the tip of the lid so that when the lid is opened and comes into contact with the blanket, the elastic lip prevents damage to the blanket. An arm is attached to a part of the lid, and one end of the arm is connected to a cylinder rod of an actuator attached to a housing of the capturing device.

This configuration performs the following operation. That is, when cleaning of the blanket is desired, the cylinder rod of the actuator attached to the unnecessary object capturing device is extended to open the lid, and the elastic lip attached to the tip of the lid is brought into contact with the blanket surface on the outer periphery of the blanket cylinder. . After that, the brush device is rotated by extending the cylinder rod of the actuator attached to the support beam to bring the brush into contact with the blanket surface, and the brush is wiped for a predetermined time. By performing the wiping operation with this brush, unnecessary substances accumulate on the upstream side of the brush, and when a predetermined amount of this accumulates, the cylinder rod of the actuator is shortened to separate the brush from the blanket surface. As a result, the unwanted matter that has accumulated on the blanket drops on the lid where the elastic lip at the tip is in contact with the blanket and accumulates. It is closed by shortening the cylinder rod, and the waste is stored in the housing of the waste catcher.

Further, the construction disclosed in Japanese Patent Application Laid-Open No. 1-128835 is arranged substantially parallel to the axis of the blanket cylinder at a position where the blanket cylinder is involved in rotation of the blanket cylinder (a triangular entrance gap). A cleaning means is provided which includes a brush having at least the same length as the axial length of the outer peripheral surface of the blanket cylinder and a waste suction device.
The brush is attached so as to be in contact with the blanket surface, and has a configuration in which a protection strip extending parallel to the axis of the blanket cylinder is provided at a location where the brush is caught by the plate cylinder during rotation of the blanket cylinder. ing.

This configuration performs the following operation. That is, the blanket that is soiled by the ink remaining during the printing operation is cleaned by a brush in contact with a blanket surface arranged parallel to the axis of the blanket cylinder.
Unnecessary substances generated by the brush wiping the blanket surface are drawn into the place where the blanket cylinder is caught by the plate cylinder in the rotation of the blanket cylinder, and are sucked through a suction port of an unnecessary substance suction device around the brush. Is discharged out of the machine through a suction pipe installed parallel to the axis of the blanket cylinder.

[0009]

The above-mentioned known technologies include:
Each had some issues to solve. That is, what is disclosed in Japanese Patent Application Laid-Open No. 63-288754 is that, in the blanket cleaning, a band-shaped cleaning cloth brought into contact with the blanket surface is pressed with a pressure pad to wipe the blanket surface, and is intermittently wound up. Unnecessary substances are transferred to the cleaning cloth and adhered to the cleaning cloth for cleaning. Unnecessary substances which cannot be transferred to and adhere to the cleaning cloth during the cleaning fall to the plate cylinder surface below. Unnecessary substances wiped and adhered to the cleaning cloth are also separated from the cleaning cloth by the intermittent winding movement of the cleaning cloth and fall onto the plate cylinder surface. As a result, defects in the printed image due to unnecessary objects on the printing plate at the time of resuming printing occur, thereby increasing printing loss.

Japanese Unexamined Patent Publication (Kokai) No. 61-205144 discloses a structure in which a brush is brought into contact with a blanket surface to rub it, so that the ink adhered to the blanket surface cannot be completely wiped off. In addition, the ink is entangled in the brush and reduces the cleaning action of the brush, and the entangled ink may stain the blanket surface. In addition, a configuration in which unnecessary materials attached to the blanket surface are scraped by a brush substantially in a straight line, and the collected unnecessary materials are rubbed with a lid having an elastic lip attached to the tip and displaced so as to open the opening of the housing. Therefore, although the elastic lip cushion is configured to prevent damage to the blanket surface, the elastic lip for scraping unnecessary objects must be brought into contact with the blanket surface with a corresponding pressure, A relatively large amount of wear on the lip was inevitable, and concomitant wear of the blanket surface was inevitable.

Japanese Patent Laying-Open No. 1-128835 discloses a blanket provided with a brush device and a suction device behind a protective strip provided at a position close to the position where the blanket cylinder is caught by the plate cylinder. A brush is brought into contact with the surface of the blanket to rub the surface of the brush to dissociate unnecessary substances from the surface of the blanket and to suction the same by a suction device. The method disclosed in JP-A-61-205144 has been described. Similarly, if the brush is brought into contact with the blanket surface and rubbed, the ink attached to the blanket surface cannot be completely wiped off, and the ink will get on the brush and reduce the cleaning effect of the brush. Ink could stain the blanket surface. In addition, the brush has a remarkable action of scraping unnecessarily adhering substances on the blanket surface in a substantially straight line, but has a poor action of dissociating the unnecessary material from the blanket surface, and has a small purification effect on the blanket surface as a whole. In addition, the drag of the undesired objects scraped by the brush exceeds the force of the brush, passes through the contact portion of the brush with the rotation of the blanket cylinder, and damages the printing plate on the plate cylinder to the entrained point. Or transfer to a printing plate, which may cause serious defects in the printed image, which may lead to an increase in printing waste.

SUMMARY OF THE INVENTION The present invention is to solve the problems of the prior art at once, that is, while satisfactorily wiping the ink adhered to the blanket surface,
In addition to efficiently removing unnecessary substances such as paper dust and recovering the removed unnecessary substances efficiently, it is possible to prevent the unnecessary substances from dropping further downward, and an object including a human body such as a worker rotates accidentally. It is an object of the present invention to provide a blanket cleaning device capable of protecting a blanket cylinder and a plate cylinder from being caught in a portion where the blanket cylinder and the plate cylinder are caught.

[0013]

In order to achieve the above object, a blanket cleaning apparatus for an offset printing machine according to the present invention is provided in which a plate cylinder is provided so as to be able to contact obliquely below the blanket cylinder, and the two cylinders face each other. In an offset printing press having a blanket cylinder and a plate cylinder forming a wrapped-up portion in which a circumferential surface has the same orientation, and the opposed circumferential surface of the plate cylinder rotates so as to go under the blanket cylinder, an axis of the blanket cylinder is provided. A blanket is provided so as to be able to displace the cleaning cloth including the nonwoven fabric, and the cleaning cloth comes into contact with a blanket surface on an outer periphery of the blanket cylinder upstream of a contact position with the plate cylinder during rotation of the blanket cylinder. A cleaning mechanism that can be arranged at a cleaning position, and an opening that is at least as long as the width of the cleaning cloth substantially parallel to the axis of the blanket cylinder. A receiving member provided with a portion, and a finishing blade provided on the receiving member substantially in parallel with the axis of the blanket cylinder. When the blanket cylinder rotates, a human body is located upstream of the entrained point and the human body is moved to the entrained point. The finishing blade is provided at a position where it always blocks entry of an object including the cleaning blade, and the tip of the finishing blade can be arranged at a cleaning auxiliary position where it can interfere with a minute unnecessary object attached to a blanket surface on the outer periphery of the blanket cylinder. The opening at the assisting position is configured to have a cleaning assisting mechanism provided so that the minute unnecessary matter can be collected and the washing unit at the blanket washing position is located at a position desired upward.

[0014] The cleaning assist mechanism in this configuration includes:
The configuration is such that a finishing blade moving mechanism is provided to move the tip of the finishing blade between the cleaning assist position and the standby position. The finishing blade moving mechanism is connected to the finishing blade via the receiving member, so that the receiving member and the finishing blade are integrally moved. Further, the distance between the tip of the finishing blade at the cleaning assist position and the blanket surface of the peripheral surface of the blanket cylinder is 0 to 0.1 mm.
5 mm or less.

[0015]

[Operation] By arranging the cleaning mechanism at the blanket cleaning position, the cleaning cloth including the nonwoven fabric of the cleaning section comes into contact with the blanket surface on the outer periphery of the blanket cylinder, and the blanket surface is cleaned with the cleaning cloth. At this time, the cleaning cloth is displaced by the cleaning unit and is sequentially updated with a new cleaning cloth.

By disposing the cleaning assisting mechanism at the cleaning assisting position, the tip of the finishing blade interferes with minute undesired substances adhering to the blanket surface on the outer periphery of the blanket cylinder, and the undesired substances are removed. Collected in the receiving member. Then, the finishing blade is moved to a cleaning assist position and a standby position by a finishing blade moving mechanism.
The receiving member is moved integrally with the finishing blade.

[0017]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a state during printing of an offset printing machine according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram showing a bracket cleaning state of the offset printing press. In these figures, 1 is a blanket cylinder, 2 is a blanket, 3 is a plate cylinder, 4 is a cleaning mechanism, and 5 is a cleaning auxiliary mechanism. FIG. 3 is an enlarged view of a main part of the cleaning mechanism 4 and the cleaning auxiliary mechanism 5, and FIG.
3 is a partial parallel view including one frame 22 of FIG. The other frame 22 has a configuration opposite to that of FIG. FIG. 5 is a view taken in the direction of arrows AA in FIG. 4, and shows a side plate 13 for attaching the cleaning assisting mechanism 5 to the frame 22.

A pair of blanket cylinders 1 and plate cylinders 2 are respectively arranged in parallel to the axis, and come into contact with the surface of the blanket 2 wound around the outer surface of the blanket cylinder 1.
For the purpose of cleaning the surface of the blanket 2, a cleaning mechanism 4 is installed substantially parallel to the axis of the blanket cylinder 1.

Into the cleaning mechanism 4, a cleaning cloth 10 containing a nonwoven fabric, which is rotatable at least as long as the axial length of the outer peripheral surface of the blanket cylinder 1, substantially parallel to the axis of the blanket cylinder 1, is wound. At least at the position which is pressed against the surface of the blanket cylinder 1 and at least the same as the axial length of the outer peripheral surface of the blanket cylinder 1 at a position pressed against the surface of the blanket cylinder 1. And a pressure pad 12 made of an elastic member. The width of the cleaning cloth 10 is at least the bracket body 1.
Is the same as the width of the bracket 2 wound around the outer circumference of the bracket.

The cleaning cloth 1 wound on the cloth supply unit 8
0 is wound around the pressure pad 12 and wound up by the cloth winding section 9. In the vicinity of the cloth supply unit 8, a spray bar 11 for spraying a cleaning liquid capable of supplying a cleaning liquid over the entire inner surface (or outer surface) of the cleaning cloth 10 immediately after being supplied from the cloth supply unit 8 is arranged.

Although not shown in this embodiment, a rotating means for rotating the cloth winding section 9 and a moving means for moving the cleaning mechanism 4 between the cleaning position and the standby position are also provided. A receiving tray 6 is provided below the cleaning mechanism 4.

The cleaning auxiliary mechanism 5 is provided at a position facing the cleaning mechanism 4 upward, substantially parallel to the axis of the blanket cylinder 1. The washing auxiliary mechanism 5 is configured as shown in FIGS. 3 to 5, and is provided on the inner surfaces of the frames 22 on both sides of the printing press via a space in front of a position where the blanket cylinder 1 and the plate cylinder 3 are caught in rotation. A pair of side plates 13 are attached by appropriate means so as to face each other. An air cylinder 15 as a driving means for moving a finishing blade 17 of the cleaning auxiliary mechanism 5 described later is symmetrically arranged on the surface of each of the side plates 13 through a space in front of the portion where the air is caught. It is installed in. Similarly, a guide groove 14 is provided on the surface of each of the side plates 13 on the side where the coil is wound, and extends toward the rolled point.

The cleaning assisting mechanism 5 has a plate-like support plate 18 in a space in front of the portion where it is caught, substantially parallel to the axis of the blanket cylinder 1 and longer than the axial length of the outer peripheral surface of the blanket cylinder 1. A guide block 20 having projections on the frame 22 side at both ends in the longitudinal direction of the support plate 18.
Are attached by appropriate means, and the convex portion of the guide block 20 is freely movably inserted into the guide groove 14 of the side plate 13 and is combined therewith. The guide block 20 is provided with a female screw portion parallel to the inner surface of the frame 22, and the distal end of the cylinder rod 16 of the air cylinder 15 installed on the side plate 13 is connected via the female screw portion. I have.

On the other hand, on the side of the support plate 18 opposite to the blanket cylinder 1, an opening having the same length as the axial length of the outer peripheral surface of the blanket cylinder 1 or at least the same length as the width of the cleaning cloth 10 is provided. The receiving member 21 provided with the above is mounted by an appropriate means so as to be substantially parallel to the axis of the blanket cylinder 1 and to cover the upper surface of the plate cylinder 3. Further, between the support plate 18 and the blanket cylinder 1, a thin plate having at least the same length as the axial length of the outer peripheral surface of the blanket cylinder 1 and having at least a front end made of resin substantially parallel to the blanket cylinder 1. Is provided, and the finishing blade 17 is attached to a support plate 18 by being sandwiched by a plate-shaped backing plate 19 having the same length as the finishing blade 17. As a result, the cleaning assist mechanism 5
In the rotation of the blanket cylinder 1, the blanket cylinder 1 is disposed at a position where it always blocks an object including a human body from entering the caught portion.

In the above-mentioned cleaning auxiliary mechanism 5, the air cylinder 15 is used as a driving means for moving the finishing blade 17 via the support plate 18, but a hydraulic or electromagnetic driving means is used instead of the air cylinder 15. (Neither is shown). Further, although the example in which the finishing blade 17 has a thin plate shape having at least the tip made of a resin is shown, as will be described later, unnecessary substances attached to the surface of the blanket 2 are removed therefrom without damaging the blanket 2. Any shape and material can be used as long as it can be guided to the receiving member 21.

Next, the overall operation in blanket cleaning will be described. As shown in FIG. 1, during the printing operation of the offset printing press, the left and right blanket cylinders 1, 1 are pressed in a direction approaching each other, and the plate cylinders 3, 3 are pressed against the bracket cylinders 1, 1. Have been
The blankets 2 and 2 wound around the outer circumferences of the left and right bracket cylinders 1 and 1 and the blanket 2 and the plate cylinder 3 are in contact with an appropriate pressing force. Then, on both sides of the sheet 7 passing between the two blankets 2, the images of the respective printing plates attached to the plate cylinders 3 are printed via the corresponding surfaces of the blankets 2. At this time, the cleaning mechanism 4 and the cleaning auxiliary mechanism 5 are at a standby position separated from the surface of the blanket 2.

If printing is continued for a certain period of time, the blanket 2 during printing becomes dirty because the ink remains on the blanket 2 and is accumulated. It is necessary to periodically clean the dirt, and the operation of cleaning the blanket 2 will be described below.

In order to clean the blanket 2, the printing speed is reduced to a speed suitable for the cleaning operation, and as shown in FIG. The cylinders 1 and 1 and the blanket cylinder 1 and the plate cylinder 3 are separated from each other so that a gap is formed between the cylinders.

Thereafter, in order to start blanket cleaning, the cleaning mechanism 4 which has been separated from the surface of the blanket 2 and at the standby position is moved to the pressure pad 12 which is the tip of the cleaning mechanism 4.
The cleaning cloth 10 moves to the cleaning position where it comes into contact with the surface of the blanket 2 via the. In addition, the cleaning assist mechanism 5 is also at the standby position away from the surface of the blanket 2, but is capable of assisting the cleaning in which the finishing blade 17 is lightly in contact with the surface of the blanket 2 through a small gap. Move to cleaning assist position.

The operation of each of the cleaning mechanism 4 and the cleaning auxiliary mechanism 5 will be described with reference to FIGS. As the operation of the cleaning mechanism 4, the entire cleaning mechanism 4 is moved by a moving mechanism (not shown) in response to a blanket cleaning start command from a control unit (not shown), and the cleaning cloth 10 is moved by the pressure pad 12 to the surface of the blanket 2 as described above. Is moved to the cleaning position where it is pressed with an appropriate pressure. Next, an appropriate amount of the cleaning liquid is sprayed from a spray bar 11 provided in a pipe (not shown) for supplying the cleaning liquid from outside the apparatus to the cleaning cloth 10 at a position immediately after being supplied from the cloth supply unit 8.

At this time, the cleaning cloth 10 is intermittently taken up by a cloth take-up section 9 which is rotated by rotating means (not shown), and the belt-like cleaning cloth 10 impregnated with the cleaning liquid intermittently covers the outer surface of the pressure pad 12. To move. By this operation, the ink adhering to the surface of the blanket 2 is softened by the cleaning liquid soaked in the cleaning cloth 10, and solid unnecessary substances such as paper powder are wiped off by the cleaning cloth 10 together with the ink. Since the cleaning cloth 10 to which the wiped-off unnecessary substances adhere is intermittently taken up by the cloth take-up unit 9, a new cleaning cloth 10 is intermittently supplied to the surface of the blanket 2. The solid waste and the like that have been separated from the cleaning cloth 10 and fallen without being caught by the winding operation of the winding unit 9 are received by the receiving tray 6.

Next, the operation of the cleaning assisting mechanism 5 will be described. During printing, the cylinder rod 16 of the air cylinder 15 of the driving means attached to the side plate 13 on the inner surface side of the frame 22 is shortened, and the finishing plate 17 and the receiving member 21 of the cleaning auxiliary mechanism 5 are used for cleaning auxiliary described later. It is in a standby position that is not a position. When performing blanket cleaning, the cylinder rod 16 of the air cylinder 15 on the inner surface of the frame 22 on both sides of the printing press is extended by a command from a control unit (not shown), for example, the blanket cleaning start command, and the guide block 20 is moved to the stroke end. Press until The guide block 20 is the side plate 1
3, the finishing blade 17 is moved together with the receiving member 21, and the tip of the finishing blade 17 comes into contact with the surface of the blanket 2 or through a small gap. It is arranged at a cleaning assisting position where it interferes with solid undesired matters left on the surface of the blanket 2 after the cleaning. In addition, the opening of the receiving member 21 at this time is arranged at a position facing the cleaning unit of the cleaning mechanism 4 upward.

The positional relationship between the tip of the finishing blade 17 and the surface of the blanket 2 is determined by a screw connecting the tip of the cylinder rod 16 of the air cylinder 15 serving as a driving means and the guide block 20 or by the side plate 13. Adjust by changing the mounting position of. According to the results that the inventor has learned from experience,
The gap between the end of the finishing plate 17 at the cleaning assist position and the surface of the blanket 2 wound around the outer periphery of the blanket cylinder 1 is preferably 0.5 mm or less. Is enough.

The finishing blade 17 thus arranged
When the cleaning mechanism 4 wipes off the solid waste left over the surface of the blanket 2 after the cleaning mechanism 4 wipes it off, when the blanket cylinder 1 reaches the position of the finishing blade 17 by rotation of the blanket cylinder 1, it interferes with the blanket. 2 and guided to the receiving member 21. In addition, the receiving member 21 receives, through the opening, an unnecessary material that falls from the cleaning unit during the cleaning operation, and prevents the waste from dropping and adhering downward, that is, onto the plate around the plate cylinder 3.

When the blanket cleaning is completed, the cleaning mechanism 4 is moved to a standby position separated from the surface of the blanket 2 by a moving means (not shown) in response to a termination command, and the finishing blade 17 and the receiving member 21 of the cleaning auxiliary mechanism 5 are also cleaned. It is moved from the auxiliary position to the standby position by shortening the cylinder rod 16 of the air cylinder 15 which is a driving means. Note that the standby position of the cleaning assist mechanism 5 is a position where the finishing blade 17 is separated from the surface of the blanket 2 and the receiving member 21 covers the upper surface of the plate cylinder 3 to receive unnecessary objects falling from above. And can prevent the unnecessary object from falling further downward, and prevent an object including a human body such as an operator from being erroneously entangled in the rotating blanket cylinder 1 and the plate cylinder 3 at a location where the rotating cylinder 1 and the plate cylinder 3 are caught. Position.

In the cleaning auxiliary mechanism 5, the movement between the cleaning auxiliary position and the standby position of the finishing blade 17 and the receiving member 21 of the cleaning auxiliary mechanism is linearly moved by the guide groove 14 of the guide plate 13. It may be performed in a curved manner using a link or an arm mechanism (not shown). Further, as another mechanism, the receiving member 21 is fixedly provided and the finishing blade 17 is provided so as to be displaceable and movable with respect to the receiving member 21.
May be displaced and moved between the cleaning assist position and the standby position (not shown).

[0037]

As described above, according to the present invention, the following effects can be obtained in a blanket cleaning apparatus having a cleaning mechanism and a cleaning auxiliary mechanism.

Since the blanket surface is cleaned by bringing the cleaning cloth including the nonwoven fabric into contact with the blanket and displacing the same, the ink adhered to the blanket surface can be efficiently wiped off with the cleaning cloth. In addition, since the portion in contact with the blanket surface is renewed by the displacement of the cleaning cloth, the ink attached to the cleaning cloth does not stain the blanket surface. In addition, most unnecessary substances on the blanket surface can be removed by the cleaning cloth.
Furthermore, even if the unnecessary material removed from the blanket surface falls, the receiving member is provided to receive the dropped unnecessary material, so that the dropped unnecessary material is collected by the receiving member. Unnecessary substances remaining on the blanket surface are removed by the finishing blade and guided to the receiving member.

Further, by setting the clearance between the finishing blade and the blanket cylinder to 0.5 mm or less, unnecessary substances that cannot be completely removed by the cleaning cloth and adhere to and remain on the blanket cylinder are captured by the tip of the finishing blade and guided to the receiving member. Can be recovered. As a result, it is possible to prevent the unnecessary material from reaching the plate cylinder located below and adhere to the printing plate on the peripheral surface of the plate cylinder. This makes it possible to eliminate the occurrence of defects in the printed image caused by the printing, thereby eliminating printing waste and thereby improving the printing work efficiency. In addition, even when the gap between the finishing blade and the blanket surface is set to zero, the contact between the two can be extremely small, and the wear of both can be minimized.

That is, the cleaning mechanism and the cleaning auxiliary mechanism are separately provided, and the solid cleaning is carried out firmly by the former, and the solid undesired substances which are not softened by the cleaning liquid are floated on the blanket surface, while the latter is lifted by the latter. Is collected, and solid waste left on the blanket surface in a floating state is removed from the blanket surface with a small force and collected, so the consumption of the blanket is minimized and the better A cleaning state can be obtained.

Further, since the washing assist mechanism always blocks the entrained portion in the rotation of the blanket cylinder and the plate cylinder, an object including a human body such as an operator enters the entrained portion without providing a safety device. Can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a state during printing of an offset printing press according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram illustrating a blanket cleaning state of the offset printing press according to the embodiment of the present invention.

FIG. 3 is an enlarged view of a main part of a cleaning machine and a cleaning auxiliary mechanism shown in FIG. 2;

FIG. 4 is a side view of the cleaning assisting mechanism shown in FIG. 3;

FIG. 5 is a view taken in the direction of arrows AA in FIG. 4;

[Explanation of symbols]

1 ... blanket cylinder, 2 ... blanket, 3 ... plate cylinder, 4
... cleaning mechanism, 5 ... cleaning auxiliary mechanism, 6 ... tray, 7 ... paper, 8 ... cloth supply section, 9 ... cloth winding section, 10 ... cleaning cloth,
11: spray bar, 12: pressure pad, 13
... side plate, 14 ... guide groove, 15 ... air cylinder as driving means, 16 ... cylinder rod, 17
... finishing blade, 18 ... support plate, 19 ... patch plate, 20
... guide block, 21 ... receiving member, 22 ... frame.

Claims (4)

(57) [Claims] 1. A plate cylinder is provided so as to be able to contact obliquely below a blanket cylinder, and opposing peripheral surfaces of both cylinders have the same orientation.
And an offset printing press having a blanket cylinder and a plate cylinder forming a rolled-up portion, wherein the opposed peripheral surface of the plate cylinder rotates so as to penetrate below the blanket cylinder, wherein the cleaning unit substantially parallel to the axis of the blanket cylinder is nonwoven fabric. Is provided so as to be capable of displacing the cleaning cloth, and can be disposed at a blanket cleaning position where the cleaning cloth contacts the blanket surface of the blanket cylinder outer periphery upstream of the contact position with the plate cylinder during rotation of the blanket cylinder. A cleaning mechanism, a receiving member provided with an opening at least as long as the width of the cleaning cloth substantially parallel to the axis of the blanket cylinder, and a finishing blade provided on the receiving member substantially parallel to the axis of the blanket cylinder. An object including a human body at a position upstream of the entrained point in the rotation of the blanket cylinder and at the entrained point. The cleaning blade is provided at a position where the end of the finishing blade is always blocked, and can be disposed at a cleaning auxiliary position where the tip of the finishing blade can interfere with minute unnecessary objects attached to the blanket surface of the blanket cylinder. And a cleaning auxiliary mechanism provided so that the opening in (1) is capable of collecting the minute unnecessary matter and the cleaning unit at the blanket cleaning position is located at a position above the blanket cleaning position. apparatus. 2. The offset printing according to claim 1, wherein the cleaning assist mechanism has a finishing blade moving mechanism for moving the tip of the finishing blade between the cleaning assist position and the standby position. Machine blanket cleaning equipment. 3. The blanket cleaning of an offset printing press according to claim 2, wherein the finishing blade moving mechanism is connected to the finishing blade via the receiving member, and the receiving member and the finishing blade are moved integrally. apparatus. 4. The apparatus according to claim 1, wherein the distance between the tip of the finishing blade at the cleaning assist position and the blanket surface of the blanket cylinder peripheral surface is 0 to 0.5 mm. 3. A blanket cleaning device for an offset printing press according to item 1.