JPH0761711B2 - Blanket cleaning device for offset printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention uses a cloth for wiping such as a non-woven fabric and a solvent to remove printing ink attached to the peripheral surface of a blanket wound around a blanket cylinder of an offset printing machine. The present invention relates to a blanket cleaning device for automatically cleaning by using.

(Prior Art) Japanese Patent Application Laid-Open No. 55-148164 discloses an apparatus for automatically cleaning a printing blanket using a wiping cloth and a solvent. According to this, the cleaning cloth is pressed against the peripheral surface of the blanket wrapped around the blanket cylinder of the printing machine using a flexible cleaning member that can expand and contract, and the blanket cylinder is rotated while supplying the ink solvent. Then, the printing ink adhering to the peripheral surface of the blanket is wiped off and removed by washing. It is disclosed that the use of such a flexible cleaning member does not require an expensive mechanism and the structure can be made compact. In the member, one cleaning member is in contact with the blanket peripheral surface of the printing machine at only one position.

Generally, as a blanket cleaning operation in the printing process, rough wiping and finish wiping are performed. In the rough wiping operation of supplying ink solvent to the peripheral surface of the blanket that has been contaminated by printing ink to moisten the ink, dissolve and remove the softened and liquefied ink while rubbing it,
The contact area of the wipe cleaning member is increased by increasing the contact area of the wipe cleaning member with the peripheral surface of the blanket, while the liquefied ink remaining after rough wiping is wiped until it is completely dried on the blanket. The smaller the size, the better the cleaning efficiency.

(Object of the Invention) The present invention efficiently sets the contact area of the wiping / cleaning member with respect to the peripheral surface of the blanket, and significantly increases the contact area between the rough wiping operation and the finish wiping operation as needed. The purpose of this is to enable the blanket cleaning in the printing process to be efficiently performed so that the blanket can be changed.

(Structure of the Invention) The present invention relates to a wiping means including a pad capable of contacting and separating from a blanket peripheral surface wound around a blanket cylinder of an offset printing machine, a solvent supplying means, and a wiping means. In a blanket cleaning device of an offset printing machine, which is provided with a cloth winding means capable of winding-moving / stopping a long-winding cloth for wiping, which is interposed between a pad surface and a blanket peripheral surface,
A wiping means provided with two or several air pads in the printing direction so as to be able to contact and separate from the blanket peripheral surface of the blanket cylinder, a solvent supply means provided between the pads, and the air pads all at once. A blanket cleaning device for an offset printing machine, comprising air supply opening / closing means for contacting / separating the peripheral surface of the blanket or for contacting / separating any one of the pads.

(Embodiment) To explain the present invention in detail in accordance with an embodiment, FIG. 1 is a side view showing an outline of the device of the present invention, in which a hermetically-sealed space portion 25, 26 for partitioning the hermetically-sealed box 1 into front and rear is provided. , A space 28 is provided therebetween, and the box 1 above the spaces 25 and 26 is provided with openings 3 and 4, respectively, and the flange 3 of the openings 3 and 4 is provided.
A flexible, stretchable and impermeable sheet 2 such as a rubber sheet (having a surface treated with silicone resin) for sealing the opening is stretched on a and 4a. And space 25,26
Two air pads 11 and 12 are formed on the upper part of the box 1 by providing air inlets 15 and 17 and air outlets 16 and 18 respectively on the bottoms 25a and 26a of the. On the other hand, in the central space 28, there is provided a solvent supply nozzle 27 for injecting a solvent for ink cleaning, which is erected from the bottom 28a, and the bottom 28a
a is a discharge port 19 or 2 that can collect excess solvent as needed.
With 0. FIG. 2 is a detailed side view of the device of the present invention. Free guide rollers 6, 6 are provided outside both ends of the box 1 in the printing direction, and the rollers integrally support the box 1 at both ends in the printing width direction. It is pivotally supported by the side frame 8. Similarly, the side frame 8 is provided with a rotary shaft 9 equipped with a pulse motor 13 incorporating a brake and a friction mechanism, and a roll-shaped cloth core of the ink wiping web cloth 5 can be mounted on the side frame 8. A braking operation or a friction operation is performed on the winding shaft 9 except when the drive signal is rotated by the pulse signal. The shaft 10 is driven and rotated by a pulse motor 13 having a brake and a friction mechanism installed therein at an arbitrarily set number of revolutions to wind the web cloth 5. Similarly, the pulse motor 13 also performs drive rotation, braking operation, and friction operation on the shaft 10. Further, tension rollers 7, 7 for tension control are provided between the guide rollers 6, 6 and the rotary shaft 9 and the drive shaft 10. The rollers 7 and 7 are fulcrums 7a supported on the frame 8.
The swing arm 7b is provided to the outside of the frame 8 via a spring 7c, and is rotatably supported at the tip of the arm 7b. It is energized.

In the embodiment of the present invention, for example, the air inlet 1
Electromagnetic air valves (electromagnetic valves) 15a and 17a are provided in the pipes introduced into the pipes 5 and 17, respectively, and the tip ends of the pipes communicate with each other and an injection pipe 21 is provided. On the other hand, each of the pipes introduced into the spouts 16 and 18 is provided with electromagnetic air valves 16a and 18a, and the tip ends of the pipes are communicated with each other and an air spouting pipe 22 is provided. A solvent press-in pipe 23 is connected to the solvent supply nozzle 27 provided in the central space 28. Further, the discharge port 19 provided in the bottom portion 28a of the space portion 28 for recovering the solvent,
Alternatively, a pipe 24 is connected to 20.

In the present invention, in the box 1 and the flange portions 3a, 4a of the opening portions 3, 4 of the box, the free guide rollers 6, 6 are provided by attaching rounded corners R at both corners at both ends in the printing direction. It can be omitted. Further, the means for attaching and fixing the device of the present invention to the vicinity of the blanket cylinder of the main body of the printing machine can be appropriately selected.

Next, an embodiment of the operation when the blanket is washed using the apparatus of the present invention will be described with reference to FIG. (B) The apparatus of the present invention is attached and fixed in a posture in which the air pads 11 and 12 are closely opposed to each other on the lower side or the side of the peripheral surface of the blanket 14 wound around the blanket cylinder which is soiled by the offset printing. As a fixing method, an attaching stay (not shown) extending outside the both side frames 8 of the apparatus of the present invention is attached and fixed to the inner frame near the blanket cylinder of the printing machine main body with bolts or the like. After mounting the device of the present invention in this manner, (b) an electromagnetic air valve
15a and 17a are opened, the air pumped by the air pump P is injected into the space portions 25 and 26 through the inlets 15 and 17, and the upper sheet 2 is inflated to the air pads 11 and 12 through the cloth 5. Contact the blanket 14 circumference. Then, an appropriate amount of an ink solvent such as toluene or trichlene is ejected from the solvent supply nozzle 27 toward the cloth 5, so that the cloth 5 is impregnated with the solvent, and then the blanket cylinder is immediately rotated to eject the solvent as necessary. While adhering the cloth 5 to the peripheral surface of the blanket 14, the ink adhering to the cloth is moistened with the solvent soaked into the cloth, and the adhering ink is liquefied on the blanket 14 by continuing the rotation for about 1 minute. The ink is melted, the supply of the solvent is stopped at an appropriate time, and the ink is roughly wiped with the cloth 5 that is in sliding contact. Then the blanket
With 14 stopped or rotated, close electromagnetic air valve 15a and open electromagnetic air valve 16a,
Air is discharged from the pouring pipe 22 to reduce the air pressure in the space 25 to atmospheric pressure, whereby only the air pad 11 and the cloth 5 on the pad 11 are separated from the peripheral surface of the blanket 14. Then, the pulse motor 13 is started while the fabric 5 is slidably contacting the peripheral surface of the blanket 14 only by the other air pad 12, and the winding shaft 10 that is interlocked with the pulse motor 13 is rotated by an appropriate amount of rotation angle, so that the pad 12 is New cloth 5 without ink adhered to a specified length (for example, 5 to 10 mm)
After unwinding, the finish wiping is performed by completely wiping off the liquefied ink remaining on the peripheral surface of the blanket 14.
When ink does not adhere to the peripheral surface of the blanket 14, the electromagnetic air valve 17a is closed, the electromagnetic air valve 18a is opened, and (d) the air in the space 26 is discharged from the air pouring pipe 22. By doing so, the air pad 12 is separated from the peripheral surface of the blanket 14 and the finishing wiping is completed.

FIG. 4 shows another embodiment of the device of the present invention. For example, two or more air pads 11a, 12a, 12a, 12a
This is an embodiment in the case where 11b and 12b are continuously provided. A free guide roller 6a for guiding the cloth 5 to the air pad side is provided in the space 28b between the pads.

(Effect of the Invention) According to the present invention, a blanket cleaning device is provided with two or more wiping members in contact with the peripheral surface of the blanket in the printing direction, and each wiping member is contacted at once or separately.・ Can be operated separately, and efficiently supplies solvent to the blanket peripheral surface, rough wiping operation for wetting, dissolving, and liquefying ink, and smooth finishing wiping operation for liquefied ink remaining after rough wiping. It can be done in a targeted manner.

(Effect of the Invention) According to the present invention, two or more air pads for wiping ink adhering to the peripheral surface of the blanket are provided in the printing direction so as to face the peripheral surface of the blanket. In addition, or separately provided so as to be capable of contact / separation operation, the cleaning of the peripheral surface of the blanket where the ink is contaminated is changed to the required maximum width or the minimum width of the contact area of the wiping member, and the rough wiping operation is performed. This can be performed separately from the finish wiping operation, and has the effect of performing the blanket cleaning efficiently and efficiently by a relatively simple and inexpensive mechanism. In particular, a large amount of ink adheres to the blanket immediately after printing, and a large-area wiping member is required to wipe it off.
Since only a small amount of ink that remains is completely wiped off, it is possible to wipe off even the smallest width wiping member. Therefore, the wiping member can be efficiently used by dividing into the rough wiping operation and the finishing wiping operation.

[Brief description of drawings]

1 is a schematic side view of the device of the present invention, FIG. 2 is a detailed side view of an embodiment of the device of the present invention, FIG. 3 is an explanatory view of a cleaning operation of the embodiment of the device of the present invention, and FIG. It is a side view of other examples of the device of the present invention. 1 …… Box, 2 …… Impermeable sheet 3,4 …… Opening, 5 …… Cloth 11,12 …… Air pad 14 …… Blanket, 15,17 …… Air inlet 16,18 …… Air Spout 25,26 …… Sealed space 27 …… Solvent supply nozzle 28 …… Central space, 29, 30 …… Partition

Claims (1)

[Claims] 1. A wiping means having a pad capable of contacting and separating from a blanket peripheral surface wound on a bracket cylinder of an offset printing machine, a solvent supplying means, a pad surface of the wiping means, and a blanket. In a blanket cleaning device of an offset printing machine provided with a cloth winding means capable of winding and moving and stopping a long cloth for wiping, which is interposed between the peripheral surface and the peripheral surface of the blanket cylinder, After wiping means provided with two to several air pads in the printing direction so as to be separable, solvent supply means provided between the pads, and all of the air pads are brought into contact with and separated from the peripheral surface of the blanket at once. A blanket cleaning device for an offset printing machine, comprising an opening / closing means for supplying air to contact / separate any of the pads.