JPH0790638B2 - Cylinder cleaning device for printing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder cleaning device for cleaning various cylinders such as a blanket cylinder and an impression cylinder of an offset printing machine, and more particularly to a printing machine having improved contactability of a pressure pad to the outer peripheral surface of the cylinder. The present invention relates to a cylinder cleaning device.

[0002]

2. Description of the Related Art In an offset printing machine, when printing is continued for a certain period of time, paper powder, ink, etc. remain on a cylinder such as a blanket cylinder and accumulate as an adhering substance.
The surface becomes dirty. Since this stain deteriorates the quality of printed matter, it is regularly cleaned. A cylinder cleaning device of the type in which a cleaning cloth is pressed against the outer peripheral surface of the cylinder by a pressure pad is used for the cleaning. This type of cylinder cleaning device is usually composed of a pressure pad having a hollow or solid structure. There are two types of hollow pressure pads, one of which is equipped with a mechanism for sending compressed air to inflate it for cleaning to press the cleaning cloth against the outer peripheral surface of the cylinder, and the other method. It has the same mechanism as the solid pressure pad system. That is, the left and right side plates to which the pad holders are attached are configured to be movable back and forth with respect to the cylinder, and a mechanism for pressing the cleaning cloth against the outer peripheral surface of the cylinder with a hollow or solid pressure pad by the forward movement is provided.

Usually, a solid pressure pad is made of hard rubber and has almost no cushioning property. Therefore, in order to uniformly press the pressure pad over the entire width of the outer peripheral surface of the cylinder, it is necessary to increase the translation accuracy of the side plate with respect to the cylinder. Even if the translational accuracy is high, if the pressure pad has irregularities in the longitudinal direction, the linearity of contact with the outer peripheral surface of the cylinder cannot be obtained. Further, in the case where an independent press-contact mechanism is arranged on the side plate so as to press both end portions of the pressure pad,
The central portion of the pressure pad escapes and bends, and the contactability with the outer peripheral surface of the cylinder also decreases.

As one of the countermeasures, for example, the conventional cylinder cleaning device 100 shown in FIG.
Is divided into a plurality of blocks, and each block is moved by an independent air cylinder 102, whereby the contactability of the cleaning cloth 7 to the cylinder 20 for each block is enhanced. In the figure, a stay 101 that supports a pad holder 103 is fixed to the side plate 2, and a support portion that slidably accommodates a pad holder that extends in the cylinder axial direction is provided on this stay. As shown in FIG. 10, the pad holders 103 are arranged in a plurality in the cylinder axis length direction, and each pad holder has a stay 101.
The air cylinder 102 is attached to the air cylinder 102 and is movable in the cylinder direction. Each pad holder 103
A pressure-bonding pad 106 for pressing the cleaning cloth 7 from the back surface and pressingly contacting the outer peripheral surface of the cylinder is attached to the. A predetermined pressure is set in each air cylinder 102 according to the pressure contact condition of each pressure bonding pad 106. Therefore, it is possible to prevent the central portion from escaping due to the bending that occurs when a single pad is pressure-bonded at both ends, and the entire length of the pressure-bonding pad is evenly contacted with the cylinder.

At the time of cleaning, the air cylinders 102 are simultaneously operated, and the cleaning cloth 7 is divided into a plurality of pressure-bonding pads 1.
The cleaning cloth 7 wound between the cloth supply roll 3 and the cloth winding roll 4 is pressed against the cylinder outer peripheral surface by 06. Then, the cleaning cloth is continuously or intermittently supplied from the cloth supply roll and is moistened with the cleaning liquid ejected from the spray bar 105 arranged on the upstream side of the pressure bonding pad, and then the dirt on the outer peripheral surface of the cylinder is wiped off, The used cleaning cloth is wound on a cloth winding roll. This type of cylinder cleaning device is disclosed, for example, in JP-A-62-74656.

[0006]

By the way, in the type in which the pressure pad is divided into a plurality of parts and each block is pressed, the pressure must be set for each air cylinder, and the structure of the pressure pad is complicated. It is troublesome to maintain the good contact property.

Further, in the type in which both ends of the pressure pad are pressed, since the central portion of the pressure pad escapes to cause bending, the central portion of the pressure pad is not wiped off by the cleaning cloth but remains partially on the outer peripheral surface of the cylinder. There is a problem that uneven cleaning easily occurs, the number of cleaning cloths used to remove the uneven cleaning increases, and the cleaning cost increases, and at the same time, the cleaning time is extended and the productivity of the printing machine is reduced. An object of the present invention is to provide a cylinder cleaning device for a printing machine, which has a simple structure, reduces the amount of cleaning cloth used, and can efficiently perform cleaning.

[0008]

In order to achieve the above object, the present invention according to claim 1 presses a cleaning pad against the outer peripheral surface of a cylinder by pressing a pressure pad, and the cleaning cloth is continuously or intermittently. In a cylinder cleaning device of a printing machine for supplying and wiping off the dirt on the outer peripheral surface of the cylinder, while making the pressure pads of the same thickness in the longitudinal direction,
A leaf spring disposed on a back portion opposite to the front surface of the pressure pad, the leaf spring being in contact with substantially the entire length in the longitudinal direction of the pressure pad and constantly pressing the pressure pad from the back portion by a predetermined elastic force; The curved surface formed on the front surface of the pressure pad has a configuration in which a leaf spring is projected forward from both ends toward the center and is formed by the elastic force of the leaf spring. A second aspect of the present invention is a cylinder cleaning device for a printing machine, which presses a cleaning pad against a cylinder outer peripheral surface by pressing the pressure pad and continuously or intermittently supplies the cleaning cloth to wipe off stains on the cylinder outer peripheral surface. In the above, the pressure pad has a uniform thickness in the longitudinal direction, and a member for receiving the pad back surface, which is arranged on the back side opposite to the front surface of the pressure pad, is provided and is formed on the front surface of the pressure pad. The curved surface is formed by the crown provided to the member that receives the back surface of the pad.

[0009]

When the cleaning cloth is pressed against the outer peripheral surface of the cylinder, the pressing force corresponding to the curved surface of the pressure pad acts on the cleaning cloth. Therefore, when pressing both ends of the pressure pad, the pressure pad curved surface compensates for the amount that the central portion of the cylinder outer peripheral surface in the cylinder axial direction bends and escapes.
Ensure contact linearity of the pressure pad. Therefore, the contact of the cleaning cloth is improved over the entire cylinder outer peripheral surface in the cylinder axis length direction, so that the outer peripheral surface of the cylinder can be uniformly wiped off, and as a result, a small amount of cleaning cloth can be used in a short time. Cleaning work can be performed efficiently.

[0010]

EXAMPLES Examples of the present invention will be described below. FIG. 1 shows the structure of the right half from the center of the cylinder cleaning device of the present invention. In the cylinder cleaning device 1, a pair of side plates 2 are movably attached to frames (not shown) on both sides of the printer body, and a pair of cloth supply rolls 3 and cloth take-up rolls 4 are attached to the side plates 2. A roll shaft that is detachably and rotatably supported is provided. Further, a support bar 5 fixed to the side plate 2 is arranged on the cylinder side of the cloth supply roll 3, and a pad holder 9 is detachably provided on the support bar. ing.

A belt-like cleaning cloth 7 is wound around the pair of rolls 3 and 4, and a predetermined tension is applied thereto. The cloth winding roll 4 is continuously or intermittently driven to rotate by a driving device (not shown). As shown in FIG. 3, a notch portion 5a parallel to the cylinder axis length direction is provided on the front surface of the support bar 5 for positioning the pressure pad 8, and the notch portion 5a is provided on the cylinder facing surface. Is formed with a long groove 5b along the cylinder axis length direction. The block 6 partly inserted into an insertion groove 8c provided on the back of the pressure pad 8 is fitted into the long groove 5b.

The pad fixing member 9 includes an L-shaped upper fixing member 9a fixed to the upper side of the support bar 5 with a screw 11 and a flat lower fixing member fixed to the front surface of the support bar 5 with a screw (not shown). 9b. Each of the pad fixing members 9a, 9b has a length substantially equal to that of the pressure pad 8, and one end of the pad fixing member 9a, 9b is formed on both sides of the pressure pad 8 (upper side surface and lower side surface at the time of mounting). The pressure pad 8 is mounted by inserting it into the support bar 5 as shown in FIG.

The pressure pad 8 is made of a material having a relatively high elastic modulus, such as hard rubber, plastic or felt. The insertion groove 8c is provided on the pad back portion corresponding to the portion of the pressure pad 8 that contacts the cylinder outer peripheral surface. When the pressure pad 8 is attached, the block 6 is inserted into the insertion groove 8c, and the back surface of the pad is in contact with the support bar 5.
A space for accommodating the elastic body 10 is formed in c. Therefore, the central portion of the pressure pad 8 in the longitudinal direction is supported by the elastic force of the elastic body 10 while being pushed from the back.

As shown in FIG. 4, the elastic body 10 is composed of leaf springs which are formed in advance from both end portions to a central portion in a predetermined curved surface, and both end portions thereof are fixed to the block 6. . The leaf spring 10 is brought into contact with the entire bottom surface of the insertion groove 8c of the pressure pad 8 and acts to push the central portion of the pressure pad 8 in the longitudinal direction by a predetermined elastic force to the cylinder 20 side by several mm. The elastic force and the curved shape of the leaf spring 10 constitute the front surface shape of the pressure pad that presses the cleaning cloth. When not pressing from the back with the elastic body, when pressing both ends in the longitudinal direction to press the pressure pad against the cylinder outer peripheral surface, a curved surface that is almost equivalent to the deflection amount of the central portion of the pressure pad caused by deformation of the pad itself, that is, a crown is formed. It is given in advance.

In the retracted position of the cylinder cleaning apparatus 1 shown in FIG. 6, that is, when the cylinder 20 is not separated and is not cleaned, the central portion of the pressure pad 8 is pushed from the back portion by the leaf spring 10 to project toward the cylinder side. The front surface of the pressure pad is deformed equally to the crown. On the other hand, when the cylinder cleaning device 1 is moved forward during cleaning, first, the cleaning cloth 7 is applied to the center of the cylinder 20.
The cleaning cloth 7 is brought into contact with both end portions of the cylinder 20 in the process of hitting. When the cylinder cleaning device 1 reaches the set position for cleaning, the cleaning cloth 7 is uniformly contacted with the entire cylinder outer peripheral surface in the cylinder axis length direction as shown in FIG. In connection with this pressing operation, the cleaning cloth 7 is continuously or intermittently supplied and simultaneously absorbs the cleaning liquid sprayed from the spray bar 12. Then, the cleaning cloth 7 is wiped to clean the outer peripheral surface of the cylinder 20 while being pressed by the pressure pad 8, and then the cleaning cloth 7 is wound around the cloth winding roll 4 after changing its direction.

Next, another embodiment of the present invention will be described. 7 and 8 show longitudinal cross-sections of the pressure pad portion of the cylinder cleaning device. Generally shown in FIG.
When a crown is applied to the front surface of the pressure pad 8A,
The thickness of the pressure pad 8A in the longitudinal direction is as follows:
Thick, both ends b become thin, and the thickness between them is continuous
Will be increased.

Therefore, in the embodiment shown in FIG. 8, the pressure pad 8B having the same thickness in the longitudinal direction is used, and the back surface of this pad is directly supported by the pad receiving surface 61 of the block 60. The pad receiving surface 61 is provided with a crown. By configuring the pad holder in this way, the restoring force when the pressure pad is pressed against the cylinder becomes the largest in the central part and decreases toward both ends, so the pressure pad is pressed against the cylinder.
The restoring force of the
Since it becomes small once, the cleaning cloth is
Contact with the outer peripheral surface of the binder is improved. Also pressure pad
Since the pad has the same thickness in the longitudinal direction, it has excellent productivity.
It In this embodiment, the front surface of the pressure pad has a curved surface, but this curved surface gives a crown, and also includes a shape that produces substantially the same action. For example, a small area of the central portion is a flat surface, the following portion is a curved surface, and a pressure pad having the same function as that of providing a crown is also included.

[0018]

As described above, according to the present invention, the press
A member that gives a crown to the back of the chapad is inserted.
Since the front shape of the pressure pad is formed as a curved surface that protrudes forward from both ends to the center, the contact accuracy when pressing the pressure pad against the cylinder outer peripheral surface is improved, and the cleaning cloth contacts the cylinder outer peripheral surface. As a result, the cleaning property can be further improved as compared with the conventional one, and the amount of the cleaning cloth used can be reduced, and the cleaning can be efficiently performed in a short time. Therefore, the print down time is reduced and the efficiency of the printing operation is increased. Further, since the pressure pads have the same thickness in the longitudinal direction, the productivity of the pressure pad is excellent and the cost is also advantageous.

[Brief description of drawings]

FIG. 1 is a perspective view showing a cross section of a main part of a cylinder cleaning device of the present invention.

FIG. 2 is a cross-sectional view showing a pressed state of a pressure pad during cleaning.

FIG. 3 is a perspective view for explaining assembling of a pressure pad.

FIG. 4 is a sectional view of a leaf spring.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a cross-sectional view showing a non-pressed state of the pressure pad during non-cleaning.

FIG. 7 is an explanatory diagram of a case where a crown is provided on the pressure pad itself.

FIG. 8 is a sectional view taken along the longitudinal direction of a pressure pad of a cylinder cleaning device according to another embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a pressed state of a pressure pad during cleaning in a conventional cylinder cleaning device.

FIG. 10 is an enlarged view of a principal part showing a partial cross section of one side portion taken along the line BB of FIG. 9.

[Explanation of symbols]

1 cylinder cleaning device, 2 side plates, 3 cloth supply rolls, 4 cloth winding rolls, 5 support bars, 6
Block, 7 cleaning cloth, 8 (8A, 8B) pressure pad, 9 pad fixing member, 10 leaf spring (elastic body), 12 spray bar, 20 cylinder, 60 block with crown

Claims (2)

[Claims] 1. A cylinder cleaning device for a printing press, comprising: a cleaning cloth pressed against a cylinder outer peripheral surface by pressing a pressure pad and continuously or intermittently supplying the cleaning cloth to wipe off stains on the cylinder outer peripheral surface. The pressure pads have the same thickness in the longitudinal direction, and are arranged on the back portion on the opposite side to the front surface of the pressure pad, and are brought into contact with substantially the entire length of the pressure pad in the longitudinal direction and have a predetermined elastic force. A flat spring that constantly presses the pressure pad from the back is provided, and the curved surface formed on the front surface of the pressure pad has a shape in which the flat spring is projected forward from both ends toward the center,
A cylinder cleaning device for a printing press, which is formed by the elastic force of the leaf spring. 2. A cylinder cleaning device for a printing machine, wherein a cleaning cloth is pressed against an outer peripheral surface of a cylinder by pressing a pressure pad, and the cleaning cloth is continuously or intermittently supplied to wipe off dirt on the outer peripheral surface of the cylinder. The pressure pad has a uniform thickness in the longitudinal direction, and a member for receiving the pad back surface, which is arranged on the back side opposite to the front surface of the pressure pad, is provided, and the curved surface formed on the front surface of the pressure pad is A cylinder cleaning device for a printing machine, wherein the cylinder cleaning device is formed by a crown provided to a member that receives the back surface of the pad.