JP2003165283A - Cylindrical blanket and blanket cylinder as well as printing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the manufacture of a printing unit, and to suppress its manufacturing cost. <P>SOLUTION: The cylindrical blanket 4B comprises a cylindrical sleeve 4Ba, a base layer 4Bb provided over the entire circumference of the outer peripheral surface of the sleeve 4B, and an elastic layer 4Bc formed on the outer peripheral surface of the base layer 4Bb. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical blanket, a blanket cylinder and a printing unit.

[0002]

2. Description of the Related Art In an offset rotary press (printing machine), ink filled in an ink reservoir is sequentially transferred by a group of ink rollers arranged side by side, while appropriately kneading in the process to form a thin ink film. ing. Then, the formed ink film is transferred to the printing plate wound around the plate cylinder, further transferred to the outer peripheral surface of the blanket cylinder, and then printed on the traveling web by rolling contact with the blanket cylinder. ing.

By the way, since the outer peripheral surface of the blanket cylinder is made of an elastic member mainly made of rubber or the like, it is liable to be worn out or damaged and needs to be replaced. For this reason,
The outer peripheral surface of the blanket cylinder is conventionally configured to be removable. As a technique related to such a blanket cylinder, for example, there is a cylindrical printing blanket disclosed in Japanese Patent Laid-Open No. 2001-146078. This blanket is, as shown in FIG.
The sheet-like blanket 102 having a cloth layer, a compressive layer, and a surface printing layer is attached to the outer periphery of the seamless sleeve 101 which is fitted to the outer peripheral surface of the sheet. The circumferential length of the sheet-shaped blanket 102 is equal to that of the sleeve 101.
Since it is set to be slightly shorter than the circumferential length of, the gap (discontinuous groove portion) 103 is formed between both ends in the circumferential direction. Elastomer is filled in the discontinuous groove portion 103 so that the sheet-like blanket 102 is prevented from penetrating the ink or the ink cleaning liquid.

[0004]

By the way, if the sheet size of the printed matter (printed on the web and cut off) changes, the diameter of the blanket cylinder also changes. Therefore, in the conventional blanket cylinder as described above, the diameter of the base roller and the sleeve and the thickness of the sheet blanket are set separately for each cutoff (the length of the printing sheet). Rollers, sleeves and sheet blankets are available.

For this reason, the manufacturing process of the base shaft roller, the sleeve, and the sheet-shaped blanket cannot be made common regardless of the cut-off, leading to complication of the manufacturing process and increase of manufacturing cost. The present invention has been made in view of the above problems, and an object of the present invention is to provide a cylindrical blanket, a blanket cylinder, and a printing unit capable of simplifying manufacturing and suppressing manufacturing cost.

[0006]

Therefore, the cylindrical blanket of the present invention (claim 1) comprises a cylindrical sleeve and
It is characterized by comprising a base layer formed over the entire outer peripheral surface of the sleeve and an elastic layer formed on the outer peripheral surface of the base layer. In this case, it is preferable that the base layer is formed to have a thickness according to the diameter of the blanket cylinder (claim 2).

Further, it is preferable that the circumferential end face of the elastic layer is impermeable to the ink and the ink cleaning liquid (claim 3). In this case, the impermeable property may be imparted to the circumferential end surface of the elastic layer by mounting a seal member on the circumferential end surface (claim 4), and the coating agent may be applied to the circumferential end surface. May be applied to the end face in the circumferential direction of the elastic layer so as to be impermeable (claim 5).

The blanket cylinder of the present invention (claim 6) is
A cylindrical blanket according to any one of claims 1 to 5 and a base shaft roller on which the cylindrical blanket is fitted, and the cylindrical blanket and the base shaft roller are configured to be detachable from each other. It is characterized by that. A printing unit of the present invention (claim 7) is characterized in that the blanket cylinder according to claim 6 is provided in the printing unit for printing on a running web.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing a cylindrical blanket, a blanket cylinder, and a printing unit as one embodiment of the present invention, FIG. 1 is a view showing the configuration of the blanket cylinder, and FIG. Of the blanket cylinder seen from the direction (front direction) (partially cut away), (b) is I- of (a)
FIG. 2 is a view showing a cross section as viewed in the direction of the arrow I with the basic shaft roller omitted, FIG. 2 is a view showing a configuration of a cylindrical blanket and an enlarged view of an A portion of FIG. 1, and FIG. 3 is a schematic side view showing a configuration of a printing unit. ,
FIG. 4 is a schematic diagram showing a plate cylinder and a printing plate, and FIGS. 5 (a) and 5 (b).
FIG. 4 is a diagram for explaining the effects of the cylindrical blanket, the blanket cylinder, and the printing unit, and a schematic cross-sectional view corresponding to a side view of the cylindrical blanket.

As shown in FIG. 3, the printing unit 1 of this embodiment is configured to print on both sides of a web 2, and a plate cylinder (printing cylinder) 3 and a blanket cylinder (transferring) are formed above and below the web 2, respectively. Body 4 is provided. In the case of a printing machine that performs multicolor printing, such a printing unit 1
Are provided along the traveling path of the web 2.

As shown in FIG. 4, each plate cylinder 3 is provided with a printing plate 3A on which a pattern (image line) to be printed is printed, and ink is supplied to the plate cylinder 3 by an ink supply device (not shown). Then, the pattern on the printing plate 3A is once transferred to the blanket cylinder 4, and then the pattern transferred to the blanket cylinder 4 is printed on the running web 2. Printing plate 3
A is a plate-shaped member formed of, for example, aluminum, and is attached to the plate cylinder 3. Here, the mounting work of the printing plate 3A will be briefly described. At the time of mounting the printing plate 3A, one end side (holding side) 3Aa of the printing plate 3A is engaged with one end portion of the gap 3B formed in the plate cylinder 3. hand,
The printing plate 3A is wound around the plate cylinder 3. Then, the other end side (holding edge side) 3Ab of the printing plate 3A is pushed into the gap 3B, and the other end portion 3Ab is fixed by a clamp device (not shown). As a result, as shown in FIG. 3, the printing plate 3A is fixed while the plate cylinder 3 is wound around.

As shown in FIG. 1 (a), the blanket cylinder 4 is constructed by fitting a cylindrical blanket 4B on a base roller 4A. The base shaft roller 4A and the cylindrical blanket 4B are separate bodies, and can be attached and detached by sliding the cylindrical blanket 4B in the axial direction of the base roller 4A. A flange 4Aa is formed at one axial end of the outer peripheral surface of the base shaft roller 4A, and the flange 4Aa serves as a stopper to define the axial position of the cylindrical blanket 4B. Although not shown, a plurality of air holes are formed in the end portion of the outer peripheral surface of the base roller 4A on the side where the flange 4Aa is not formed. When the cylindrical blanket 4B is attached / detached, compressed air is ejected from the air holes, and the inner diameter of the cylindrical blanket 4B is expanded so that the cylindrical blanket 4B can be easily fitted into and removed from the base shaft roller 4A.

The cylindrical blanket 4B is shown in FIG.
As shown in (b) and FIG. 2, a metal sleeve 4Ba forming the inner cylinder, a base layer 4Bb formed on the entire outer peripheral surface of the metal sleeve 4Ba, and a plate forming the outer peripheral surface. The elastic body 4Bc. The metal sleeve 4Ba has an inner diameter slightly smaller than the outer diameter of the base shaft roller 4A. After the metal sleeve 4Ba is fitted into the base shaft roller 4A, the base shaft roller 4A is tightened from the surroundings. It is configured so that there is no deviation in the rotational direction and the axial direction. The metal sleeve 4Ba is manufactured seamlessly by, for example, an electroforming method.

As described above, if the cutoff is changed, the diameter of the blanket cylinder 4 must be changed. The base layer 4Bb is for absorbing a change in the diameter of the blanket cylinder 4 due to such a cutoff, and its thickness is changed according to the cutoff (that is, according to the diameter of the blanket cylinder 4). Incompressible so that printing performance is not affected by the difference in thickness. The material of the base layer 4Bb is, for example, acrylonitrile-butadiene copolymer rubber (NBR). The base layer 4
A layer such as a base cloth may be further added to Bb.

The plate-like elastic body 4Bc is, as shown in FIG.
Here, the surface rubber layer 41, the base cloth layer 42, and the compression layer (foaming layer) 43 are manufactured as a plate-shaped member having a multilayer structure, and are wound around the outer peripheral surface of the base layer 4Bb to form an adhesive or the like. Pasted by. The circumferential length of the plate-shaped elastic body 4Bc is set to be slightly shorter than the circumferential length of the outer peripheral surface of the base layer 4Bb. Therefore, when mounted on the outer peripheral surface of the base layer 4Bb, a gap (seam) 4C is formed between both ends in the circumferential direction.

Further, both end portions in the circumferential direction of the plate-like elastic body 4Bc are covered with sealing members 4Bd as shown in FIG. A material impermeable to ink or a cleaning liquid for cleaning the ink is used for the seal member 4Bd, and the ink and the cleaning liquid are fed from the end portion to the base cloth layer 4
It is possible to prevent the plate-like elastic body 4Bc from peeling from the base layer 4Bb or the layers 41, 42, 43 from peeling from each other by penetrating into 2 or entering between the layers 41, 42, 43. I am trying to do it.

As the material of the seal member 4Bd, various synthetic rubbers and elastomers can be used. Specific examples of the elastomer include synthetic rubbers such as NBR, chloroprene rubber (CR) and urethane rubber (U). Is mentioned. Instead of using the sealing material 4Bd, a coating material impermeable to the ink and the cleaning liquid is applied to the plate-shaped elastic body 4Bc.
You may make it apply | coat to both circumferential direction both ends.

In order to prevent the seam 4C from contacting the printing pattern surface of the printing plate 3A, the seam 4C is rotated during rotation.
The relative phase between the seam 4C and the gap 3B is adjusted so that is aligned with (faces) the gap 3B (see FIG. 4) on the outer peripheral surface of the plate cylinder 3. Since the cylindrical blanket, the blanket cylinder, and the printing unit according to the first embodiment of the present invention are configured as described above, blanket cylinders as shown in FIGS. 5A and 5B are prepared for different cutoffs. The diameter of is changed. That is, FIG. 5 (a)
Then, the radius r of the base roller 4A, the sleeve 4B made of metal
The radius R of the blanket cylinder is set to R1 with the thickness t of a, the thickness t of the base layer 4Bb, and the thickness t3 of the plate-like elastic body 4Bc set to a, b, c, and d, respectively (R
= A + b + c + d = R1), and in FIG. 5 (b), the respective dimensions r, t1, t2, t3 are set to a, b, c ', d, respectively, and the radius R of the blanket cylinder is set to R2 different from R1 (R = A + b + c '+ d = R2). That is, the radius r (= a) of the base roller 4A and the thickness t1 of the sleeve 4Ba.
(= B) and the thickness t3 (= d) of the plate-like elastic body 4Bc are the same, and the thickness t2 of the base layer 4Bb is changed, thereby changing the radius R of the blanket cylinder.

Therefore, only the base layer 4Bb needs to be manufactured for each cutoff, and the base shaft roller 4A and the sleeve 4Ba can have the common specifications regardless of the cutoff. Further, the plate-like elastic body 4Bc is cut to a predetermined length and then attached to the base layer 4Bb, and the predetermined length is changed for each cutoff, and the plate-like elastic body 4Bc can be commonly used regardless of the cutoff.

Since the sleeve 4Ba is mounted on the base roller 4A by making the inner diameter of the sleeve larger than the diameter of the cylinder (base shaft roller) by air or the like, there is a limit in changing the thickness, and since it is made of metal, it is thick. If it is formed into a film, the cost will increase. Further, the thickness of the plate-shaped elastic body 4Bc directly affects the printing performance. Therefore, the thicknesses of the sleeve 4Ba and the plate-shaped elastic body 4Bc are not suitable for arbitrary adjustment.

On the other hand, since the base layer 4Bb is provided in advance for adjusting the thickness of the blanket cylinder 4, its thickness has little influence on the printing performance, and since it has the NBR property, the thickness can be easily adjusted. . Therefore, by producing only the base layer 4Bb for each cut-off, there is an advantage that the production of the cylindrical blanket 4B, by extension, the blanket cylinder 4 and the printing unit 1 can be simplified and the production cost can be suppressed.

The cylindrical blanket, the blanket cylinder, and the printing unit of the present invention are not limited to the above-described embodiments, but can be variously modified without departing from the spirit of the present invention. For example, in the above-described embodiment, the seal members 4Bd are attached to both ends in the circumferential direction of the cylindrical blanket 4 in order to make the both ends in the circumferential direction impermeable, but instead of attaching the seal members 4Bd, , Coating the both ends in the circumferential direction with a coating agent,
A filling material may be filled in C as in the prior art shown in FIG.

[0023]

As described above in detail, the cylindrical blanket of the present invention according to claims 1 and 2, the blanket cylinder of the present invention according to claim 6 and the printing unit of the present invention according to claim 7. According to this, it is possible to easily change the diameter of the blanket cylinder by changing the thickness of the base layer without changing the diameter of the base roller and the thickness of the sleeve. There is an advantage that the manufacturing can be simplified and the manufacturing cost can be suppressed.

Further, by making the circumferential end face of the elastic layer impermeable to the ink and the ink cleaning liquid, the ink or the ink cleaning liquid permeates into the elastic layer and the elastic layer peels off from the base layer. Thus, it becomes possible to prevent the layers forming the elastic layer from being separated from each other (claim 3). In this case, the impermeability is obtained by mounting an impermeable seal member on the circumferential end surface (claim 4).
This can be easily realized by applying a coating agent impermeable to the ink and the ink cleaning liquid to the circumferential end surface of the elastic layer (claim 5).

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a blanket cylinder as one embodiment of the present invention, in which (a) is a front view of the blanket cylinder seen from a traveling direction (front direction) of a web (partially broken and shown. (A) and (b) are views showing a cross section taken along the line I-I of (a) with the base shaft roller omitted.

FIG. 2 is a diagram showing a configuration of a cylindrical blanket as an embodiment of the present invention and is an enlarged view of a portion A in FIG.

FIG. 3 is a schematic side view showing a configuration of a printing unit as an embodiment of the present invention.

FIG. 4 is a schematic view showing a plate cylinder and a printing plate according to an embodiment of the present invention.

5 (a) and 5 (b) are views for explaining the effects of the cylindrical blanket, the blanket cylinder, and the printing unit as one embodiment of the present invention, and are schematic views corresponding to a side view of the cylindrical blanket. FIG.

FIG. 6 is a schematic cross-sectional view showing a configuration of a main part of a conventional cylindrical blanket according to a side view.

[Explanation of symbols]

1 printing unit 2 Web 3 plate body 3A printing plate 3Aa gripper side 3Ab Mouth side 3B gap 4 blanket body 4A Spindle roller 4Aa flange 4B cylindrical blanket 4Ba sleeve 4Bb base layer 4Bc Plate-like elastic body 4Bd seal member 4C seam 41 Surface rubber layer 42 Base cloth layer 43 Compressed layer (foamed layer) R Blanket body 4 radius r Radius of the base roller 4A t1 Thickness of metal sleeve 4Ba t2 Base layer 4Bb thickness t3 Thickness of plate-like elastic body 4Bc

Claims (7)

[Claims] 1. A cylindrical sleeve, a base layer provided on the outer peripheral surface of the sleeve over the entire circumference thereof, and an elastic layer formed on the outer peripheral surface of the base layer. Characteristic cylindrical blanket. 2. The cylindrical blanket according to claim 1, wherein the base layer has a thickness corresponding to a diameter of the blanket cylinder. 3. The cylindrical blanket according to claim 1, wherein the end face in the circumferential direction of the elastic layer is impermeable to the ink and the ink cleaning liquid. 4. The cylindrical blanket according to claim 3, wherein the circumferential end face of the elastic layer is made impermeable by mounting a sealing member on the circumferential end face. 5. The cylindrical blanket according to claim 3, wherein the circumferential end face of the elastic layer is made impermeable by applying a coating agent to the circumferential end face. . 6. A cylindrical blanket according to claim 1, and a base shaft roller on which the cylindrical blanket is fitted, and the cylindrical blanket and the base roller are fitted and removed. A blanket cylinder, characterized by being freely configured. 7. A printing unit for printing on a running web, comprising a blanket cylinder according to claim 6.