JPH0976476A - Cleaning device for printing cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive to uniformalize pressing pressure by a simple structure and a small nipping region by a method wherein a pressing part is composed of a pad base having a core part, the part opposite to a printing cylinder of which is an arcuated surface, and a sponge elastic sheet, which is wound around the outer periphery of the core part and the elastic sheet is fixed to the pad base. SOLUTION: A pressing part 18 for pressing a cleaning cloth against a blanket cylinder is composed of a pad base 32, which can attach to and detach from a main stay 20, and a sponge elastic sheet 34. In addition, at the middle of the plate surface of the pad base 32, a projecting bead 38, the tip of which is an arcuated surface and at both the ends of which dovetails 36 are formed. In a cleaning position, the projecting bead 38 is set to be opposite to the surface of the blanket cylinder and then the sponge elastic sheet 34 is wound around the projecting bead as a core. Then, by caulking with caulking pieces 40, the sponge elastic sheet 34 is fixed to the pad base 32. Further, the pad base 32 is fixed to the main stay 20 by means of a dovetail groove 44 and a wedge screw 46. Accordingly, a structure can be simple and a nipping region can be made smaller, resulting in allowing to uniformalize pressing pressure and simplify the exchanging work of the pressing part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing cylinder cleaning device, and more particularly to a device for wiping and cleaning the surface of a printing cylinder such as a blanket cylinder, and more particularly to improvement of a pressing portion for pressing a wiping cloth against the cylinder surface.

[0002]

2. Description of the Related Art Conventionally, as a printing cylinder cleaning device for cleaning a blanket cylinder, an impression cylinder, etc., it has been possible to run a cleaning cloth made of a non-woven fabric impregnated with a cleaning liquid on a pressing portion that can be brought into and out of contact with the cylinder surface. There is known a device that wipes and removes surface stains by moving the pressing portion in contact with the cylinder surface during a cleaning operation to utilize the nip pressure of the pressing portion and the rotation of the printing cylinder.

Some printing cylinder cleaning devices of this type utilize a rubber sheet in order to uniformly press the cleaning cloth in the cylinder length direction of the cylinder in question. This has a structure in which a rubber sheet is attached to the base along the trunk length direction, air is introduced into the base to inflate the rubber sheet into a semi-cylindrical convex cross section, and the elastic force presses the cleaning cloth against the cylinder surface. . The cleaning cloth is sent to the outer surface of the rubber sheet thus inflated in the direction opposite to the rotation direction of the printing cylinder, and the cylinder surface is wiped with the cleaning cloth. This cleaning cloth is wetted with a cleaning liquid to perform a cleaning action.

[0004]

However, in the above-mentioned conventional structure, as shown in FIG. 6, the pressing portion covers the opening surface portion of the rubber sheet 1 formed in a semi-cylindrical shape with the base 2 made of a flat plate. , The flange portion 3 on the side edge of the sheet is held by the pad retainer 4, and the end opening is retained by the retainer plate 5.
It is fixed to the base 2 to seal the inside of the seat. Then, this is fixed to the main stay 6 that constitutes the frame of the cleaning device by bolting.

In such a structure, there is a problem that the structure of the pressing portion is complicated and that the replacement work becomes difficult after it is once attached to the apparatus frame. Also,
Since it is necessary to attach a mechanism for filling the inside with air or the like, it is more difficult to replace the pressing portion by a simple operation.

On the other hand, there is also known one in which the pressing portion is composed of a sponge-like pressing body made of urethane (Japanese Utility Model Publication No. 4-36924), but this is a structure in which the pressing force is set by the sponge alone. Since an appropriate nip pressure cannot be applied to the cylinder having a circular surface and the rectangular cross section is provided, the nip region becomes large, imbalance of the pressing force is likely to occur, and uneven cleaning occurs.

Focusing on the above-mentioned conventional problems, the present invention relates to a printing cylinder cleaning device having a simple structure, a small nip area, and a uniform pressing pressure. It is intended to be provided. Another object of the present invention is to provide a printing cylinder cleaning device having a structure in which the work of exchanging the pressing portion can be extremely simplified.

[0008]

In order to achieve the above object, a printing cylinder cleaning apparatus according to the present invention is a cleaning apparatus for wiping and cleaning a printing cylinder with a cleaning cloth. The cleaning cloth is pressed against the printing cylinder. And a sponge elastic sheet having a constant thickness wound around and attached to the outer periphery of the arc surface core portion, the pad base having a core portion having an arc surface facing the printing cylinder. The elastic sheet is fixed to the pad base.

Secondly, in a cleaning device for wiping and cleaning the printing cylinder with a cleaning cloth, a pressing portion for pressing the cleaning cloth against the printing cylinder is sponge on the outer surface of the arc surface core formed on the pad base. The elastic sheet is wound around and configured, and the pad base is attachable to and detachable from the apparatus frame side by a fitting structure including a dovetail and a dovetail groove. In this case, the dovetail groove in the fitting structure is formed on the frame side, and
The pad base may be configured such that one side edge thereof is fixed by a wedge-shaped screw.

[0010]

According to the above construction, since the pressing portion has a structure in which the pad base has the arcuate surface core portion and the sponge elastic sheet is wound around the pad base, the outer surface of the sponge elastic sheet is also formed as an arcuate surface. It Therefore, the cleaning cloth can slide on the circular arc surface and can move smoothly, and the contact with the printing cylinder is almost in line contact, so that the nip area can be reduced and the sponge elasticity is always maintained in the contactable area. Since the sheet has a uniform thickness, a uniform pressing force can be generated. As a result, it is possible to perform the cleaning work without cleaning unevenness without using a means for expanding with air pressure or the like.

Further, since the pad base to which the sponge elastic sheet is attached has a fitting structure with the dovetail and the dovetail groove with the device frame, only the pressing portion alone can be attached and detached without removing the cleaning device from the printing machine. Will be things.
As a result, even if a replacement work occurs due to deterioration of the sponge elastic sheet, the replacement work can be easily performed without disassembling the device, and the idle time of the printing device can be shortened. By forming the dovetail groove on one side edge part with a wedge screw at the fitting part between the pad base and the frame, removing the screw and rotating the pad base around the dovetail groove on one side edge saves space. It becomes possible to replace, and the workability of replacement is further improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the printing cylinder cleaning device according to the present invention will be described in detail below with reference to the drawings. First, the overall configuration of the printing cylinder cleaning device will be described with reference to FIG. The cleaning device 10 is arranged so as to face the blanket cylinder 12 to be cleaned, and has a frame including a pair of side plates 14 and a stay 16 having an H-shaped cross section that is provided between the side plates. . Stay 1
Reference numeral 6 is composed of a main stay 20 facing the blanket cylinder 12 to which the pressing portion 18 is attached, and a pair of upper and lower cleaning cloth guide stays 22. A supply roll 26 and a take-up roll 28 for the cleaning cloth 24 are arranged behind the stay 16, and the cleaning cloth 24 is fed out from the supply roll 26 and from the upper guide stay 22U in FIG. It is adapted to be wound up by a winding roll 28 on the rear side through the guide stay 22D. Winding of the cleaning cloth 24 is performed by intermittently rotating the winding roll 28 while braking the supply roll 26, and a mechanism therefor is provided on the side plate 14 (not shown). Further, a cleaning liquid supply nozzle 30 is arranged on the side of the pressing portion 18 inside the stay 16 (upper part in the drawing), and the cleaning liquid is appropriately jetted and supplied to the cleaning cloth 24. As a result, the cleaning cloth 24 delivered intermittently reaches the tip of the pressing portion 18 while being wetted by the cleaning liquid, and at that time, the apparatus frame is advanced to bring the pressing portion 18 into contact with the surface of the blanket cylinder 12. The cleaning action is performed.

In such a printing cylinder cleaning apparatus, the pressing portion 18 having the characteristic structure of the present invention is shown in FIGS. As shown in the figure, the pressing portion 18 is the stay 16
The pad base 32 can be easily attached to and detached from the main stay 20, and for this reason, the pad base 32 and the sponge elastic sheet 34 attached to the pad base 32 are included. The pad base 32 has a pair of dovetails 36 in which both side edges of the flat plate are obliquely cut, and a ridge 38 whose front end surface is an arc surface is integrally projected at the center of the plate surface. There is. The protrusion 38 is set so that the arcuate surface faces the surface of the blanket cylinder 12 when the base 32 is attached to the frame and the cleaning posture is entered, and serves as a winding core portion of the sponge elastic sheet 34. ing.
Caulking pieces 40 are erected on both sides of the ridge 38 of the pad base 32. The caulking piece 40 is formed by sandwiching the end of the sponge elastic sheet 34 wound around the ridge 38 with the ridge 38. It is fixed by caulking, and initially the ridge 38
It stands upright in parallel with and is bent when the sponge elastic sheet 34 is mounted so that the sheet end portions are clamped.

On the other hand, the sponge elastic sheet 34 is formed by foaming a solvent-resistant fluororubber as a raw material, which is supplied as a sheet material having a constant thickness, which is provided on the ridge 38. It is designed to be wrapped around the outer circumference and attached. As shown in FIG. 2, the sponge elastic sheet 34 is first inserted into the gap between the ridge 38 of the pad base 32 and the one side caulking piece 40 at one end thereof ((1) in the figure), and the remaining end. The part is wound around the arc surface of the ridge 38 and inserted into the other gap ((2) in the figure). After that, the caulking pieces 40 on both sides are tilted toward the ridge 38 side to fix the caulking pieces 40 to the pad base 32. In order to prevent the sponge elastic sheet 34 from falling off after caulking, a claw 42 is formed on the inner surface portion of the caulking piece 40 to prevent separation.

As described above, the pressing portion 18 as described above is
The stay 16 can be easily attached to and detached from the stay 16. Therefore, a dovetail groove 44 that fits into the dovetail 36 formed on the pad base 32 is formed on the surface of the main stay 20. In this embodiment, the dovetail groove 44 defines the pad base 32.
It is provided for fitting to one side edge of the dovetail 36 and the other side edge of the dovetail 36 is pressed by a wedge screw 46. As shown in FIG. 1, the pad base 32 is installed on the main stay 20 so that the dovetail 36 on one side edge contacts the lower guide stay 22D, and in this state, the other side edge (toward the upper guide stay 22U side). The dovetail groove 44 is formed so as to be fitted with the dovetail 36 at the edge). Ant 3 in contact with lower guide stay 22D
There is a screw 46 that is screwed into a screw hole 48 formed in the lower guide stay 22D to hold the 6, and this has a conical tip 46A having an inclination in which the tip is aligned with the inclined surface of the dovetail 36. , The conical tip 46 due to the screwing action
When A is exposed on the main stay 20, the cone tip 4
There is an angle between 6A and the surface of the may stay 20, and there is a groove 4
It is set to match 4. Therefore, by mounting the pad base 32 on the main stay 20 and screwing in the wedge screw 46, the pad base 32 is firmly fixed by the wedge action of the screw 46.
The wedge screw 46 may be provided with a plurality of screw holes 48 so that the wedge screw 46 can be attached at appropriate intervals along the longitudinal direction of the pad base 32.

In the embodiment constructed as described above, the pressing portion 18 formed by winding the sponge elastic sheet 34 around the pad base 32 and attaching the sponge elastic sheet 34 by removing the wedge screw 46,
It can be easily separated from the main stay 20. Since this is an operation from the outer side surface of the guide stay 22, the pressing portion 18
The replacement workability of is greatly improved. Further, since the pressing portion 18 has a configuration in which the sponge elastic sheet 34 having a constant thickness is wound around the arc surface ridge 38 of the pad base 32 as a core portion, the outer surface of the sponge elastic sheet 34 also has an arc shape, The contact with the blanket cylinder 12 can be in a substantially linear contact state, which can reduce the nip width and prevent the deviation of the pressing force as much as possible. Further, since the thickness of the sponge portion is uniform at any position on the arc surface, the pressing force can be made uniform. Further, since the pad base 32 of the pressing portion 18 has a uniform cross-sectional structure, it can be molded by simple die cutting, and there is an advantage that the manufacturing cost of the pressing portion can be reduced.

Next, FIGS. 3 and 4 show a second example. This is an example of changing the structure of the pad base. That is, the pad base 32A of the embodiment is a thick flat plate, and the dovetail 36 formed at the lower side edge is provided by forming the V-shaped groove 50 on the side surface. An arc surface 52 having an outer diameter substantially matching the outer diameter of the blanket cylinder 12 is formed on the surface portion of the base 32A, and an end surface having a height dimension smaller than the thickness dimension of the sponge elastic sheet 34 is formed on the side edge portion thereof. A presser foot 54 is provided. Then, the caulking piece 40 is provided on the upper end of the end face retainer 54, and the sponge elastic sheet 34 is attached.
The outer surface of the end of the is caulked and fixed (Fig. 4).
(3)). In this example, the main stay 20 is bolted to the guide stay 22, and the main stay 20 has a thin wall while the main stay 20 is thin.
The stay 16 having an H-shaped cross section is configured by assembling the two to reduce the weight and the cost. Other configurations are the same as in the first embodiment.

[0018]

As described above, according to the present invention,
A pad base having a pressing portion for pressing the cleaning cloth against the printing cylinder, the core having an arc surface facing the printing cylinder side, and a sponge having a constant thickness wound around the outer periphery of the arc surface core portion. By fixing the sponge elastic sheet to the pad base, the structure is simple and the nip area can be reduced, and the pressing pressure can be made uniform. , Press the cleaning cloth against the printing cylinder,
The sponge elastic sheet is wound around the outer surface of the arcuate core formed on the pad base, and the pad base is attachable to and detachable from the apparatus frame side by a fitting structure including a dovetail and a dovetail groove. As a result, it is possible to obtain an effect that the work of exchanging the pressing portion can be extremely simplified.

[Brief description of drawings]

FIG. 1 is an explanatory view of an attaching / detaching operation of a pressing portion according to a first embodiment.

FIG. 2 is an explanatory view showing a state in which the sponge elastic sheet of the same embodiment is attached to a pad base.

FIG. 3 is an explanatory view of an attaching / detaching operation of a pressing portion according to the second embodiment.

FIG. 4 is an explanatory diagram showing a state in which the sponge elastic sheet of the same embodiment is attached to a pad base.

FIG. 5 is a side sectional view showing an overall schematic configuration of the cleaning apparatus of the embodiment.

FIG. 6 is an exploded perspective view of a conventional pressing portion.

[Explanation of symbols]

 10 cleaning device 12 blanket cylinder 14 side plate 16 stay 18 pressing part 20 main stay 22 (22U, 22D) guide stay 24 cleaning cloth 26 supply roll 28 winding roll 30 cleaning liquid supply nozzle 32 pad base 34 sponge elastic sheet 36 ant 38 ridge (Core) 40 Caulking piece 42 Claw 44 Dovetail groove 46 Wedge screw 46A Conical tip 48 Screw hole

Claims (3)

[Claims] 1. A cleaning device for cleaning a printing cylinder with a cleaning cloth, the pad base having a pressing portion for pressing the cleaning cloth against the printing cylinder, the core having an arcuate surface facing the printing cylinder. And a sponge elastic sheet having a constant thickness, which is wound around and attached to the outer periphery of the arc surface core, and the sponge elastic sheet is fixed to a pad base. 2. A cleaning device for wiping and cleaning a printing cylinder with a cleaning cloth, wherein a pressing portion for pressing the cleaning cloth against the printing cylinder is attached by winding a sponge elastic sheet around an outer surface of an arc surface core formed on a pad base. In addition, the printing cylinder cleaning device is characterized in that the pad base can be attached to and detached from the device frame side by a fitting structure including a dovetail and a dovetail groove. 3. The printing cylinder cleaning device according to claim 2, wherein the dovetail groove in the fitting structure is formed on the frame side, and one side edge of the pad base is fixed by a wedge screw. And a printing cylinder cleaning device.