JP3448200B2 - Impression cylinder for sheet-fed printing press - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impression cylinder of a sheet-fed printing press for printing, for example, a surface of a thin metal plate. 2. Description of the Related Art A rotary type sheet-fed printing press mainly comprises a paper feeder,
It is composed of a printing device, a paper discharging device, and the like. FIG. 5 is a drawing partially showing a plurality of sets of conventional printing apparatuses.
(A). FIG. 5B is an enlarged view of a portion 5b in FIG. 5A. In a printing apparatus in the case of offset printing, printing is performed while the sheet to be printed 100 is mainly transferred by the impression cylinder 101, the plate cylinder 102, the blanket cylinder 103, and the intermediate cylinder 104. Each cylinder rotates synchronously at a predetermined phase timing by a gear (not shown) attached to the shaft end. A claw device 105 for holding the printing target sheet 100 is incorporated in the impression cylinder 101 and the intermediate cylinder 104. The sheet to be printed 100 locked on the pawl 106 of the impression cylinder 101 is transferred to the pawl 106 of the intermediate cylinder 104 on the downstream side, and then the pawl 106 of the impression cylinder 101 of the next printing apparatus is provided.
Passed to. When a flat metal thin plate is used as the printing sheet 100, for example, a front end portion 100a in the traveling direction is used.
Is fixed in addition to the claws 106, but the rear end portion 100b is free without any restriction. Therefore, in the case of FIG. 5, the impression cylinder 101 extends from the front end portion 100a to the intermediate portion 100c in pressure contact with the blanket cylinder 103.
When the rear end portion 100b is released from being pinched between the impression cylinder 101 and the upstream intermediate drum 104 by rotation of the impression cylinder 101, the rear end portion 100b , Inevitably violently vibrate up and down around the middle portion 100c (reference). In the case of printing on the printing sheet 100 of the same size, the vibration causes the rear end portion 100b of the printing sheet 100 to hit the same place on the outer peripheral surface 107 of the impression cylinder 101 a plurality of times, and as shown in FIG. As shown, a flaw or dent (hereinafter referred to as flaw 108) is formed on the outer peripheral surface 107 of the impression cylinder 101 along the axial direction. The scratches 108 occur not only when the sheet to be printed 100 has elasticity, but also when the sheet to be printed 100 has elasticity, but it is particularly noticeable in a printing machine using the metal sheet. [0004] The impression cylinder 101 of the printing press is adapted to
It plays an important role in making the ink of 0
If there is a flaw 108 on the outer peripheral surface 107 of the impression cylinder 101, the ink does not transfer to the sheet to be printed 100 only at the location where the flaw 108 is hit, resulting in chipping of characters and flaws in a pattern, and various print irregularities. This causes printing trouble or deformation of the sheet 100 to be printed. Conventionally, as a countermeasure, hard plating is applied to the outer peripheral surface 107 of the impression cylinder 100 to make the outer peripheral surface 107 extremely hard. [0005] However, even if the surface hardening is enhanced, the period of use is short, and frequent surface repair work is required. In the assembled state, it is not easy to repair the flaws 108 on the outer peripheral surface 107 of the impression cylinder, the work time is long, the machine operation rate is reduced, the productivity is reduced, and the running cost is reduced. The result is soaring. In addition, there is a countermeasure that the impression cylinder 101 is removed from the printing apparatus to perform a repair operation.
However, in this case, the impression cylinder 1 is previously provided to the printing apparatus.
The need to have a structure that allows easy removal and installation of 01 results in increased manufacturing costs for the printing press. Here, metal printing is used not only for making cans but also in recent years as a part of components of various home appliances, and the demand for metal printing is increasing. In recent years, demand for tube printing has been increasing. However, the conventional device has problems such as an increase in manufacturing cost and an increase in running cost, and problems such as a decrease in productivity in repair have not been solved. The growing demand has led to a solution to this problem. The present invention has been made in view of the above circumstances, and provides an impression cylinder for a sheet-fed printing machine that can easily perform repair work when printing on an elastic print sheet such as a metal thin plate. Aim. SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has been developed for a sheet-fed printing press.
Printed sheet running rotatably held by the
Transfers ink to print surface in cooperation with blanket cylinder
In the impression cylinder of a sheet-fed printing press, both ends are parallel to the axis of the impression cylinder.
The outer peripheral surface of the impression cylinder is
A claw device that is substantially equally divided into two and holds the printing target sheet.
Placement is incorporated in the notch, the printing sheet,
A flat plate-like thin metal plate having elasticity, to the thin metal plate
In order to protect the outer peripheral surface of the impression cylinder from scratches due to
Uniformly and wrapped bisected further made of a film of the same type on each outer peripheral surface, respectively, the film is peelable contact
Affixed to the outer peripheral surface of the impression cylinder with an adhesive,
Therefore, it is possible to replace each scratched film
There is . Next, an embodiment of an impression cylinder of a sheet-fed printing press according to the present invention will be described with reference to the drawings. As an example, a rotary sheet-fed printing press is shown in FIGS. FIG. 1 is a front view conceptually showing the entire sheet-fed printing press, and FIG.
Is a plan view of the impression cylinder in FIG. 1, and FIG. 3 is a line II in FIG.
FIG. 4 is a cross-sectional view taken along the line I-III, and FIG. 4 is a front view conceptually showing the positional relationship between the impression cylinder, the blanket cylinder, and the sheet to be printed in FIG. As shown in FIG. 1, the sheet-fed printing press 20 includes a paper feeding device 30, four sets of printing devices 51, 52, 53, and 54, a paper discharging device 60, a printing sheet stacking device 70, and the like. . In addition, the sheet-fed printing press 20 performs one-side offset printing by color printing in which four colors are overprinted. The sheets to be printed 10 stacked on the table 31 of the sheet feeding device 30 are sent out one by one from the uppermost stage to the first intermediate cylinder 41, and then sequentially run through the printing devices 51 to 54. Thus, predetermined printing is performed on the upper surface side of the printing target sheet 10. That is, the print-receiving sheet 10 sent out from the paper feeding device 30 is delivered to the first intermediate cylinder 41, and then sequentially delivered to the side-by-side impression cylinder 1, the intermediate cylinder 42, and the next impression cylinder 1. These are connected to each other via gears (not shown) fixed to the respective shaft ends, and are configured to rotate at a predetermined timing. The printing devices 51 to 54 include plate cylinders 51a to 54a on which ink reservoirs, ink roller groups, and printing plates (all not shown) are wound.
, The blanket cylinders 51b to 54b, the impression cylinder 1, and other constituent members not shown. After the ink in the ink reservoir is transferred to various ink roller groups, the plate cylinder 51
The printing plate on a to 54a is supplied to blanket cylinders 51b to 54b, and is further transferred to the surface of the printing target sheet 10 traveling between the blanket cylinders 51b to 54b and the impression cylinder 1. Thereby, printing is performed. The printed sheet 10 after printing is delivered to the chain gripper 63 of the endless chain 62 that runs around the paper discharge shaft 61 of the paper discharge device 60, and is transferred from the chain gripper 63 on the print sheet stacking device 70. After being released, they are stacked on the stacking table 71. In this embodiment, metal printing is performed using a flat metal sheet having elasticity as the sheet 10 to be printed. The metal thin plate is, for example, a steel plate such as a tin plate or an aluminum plate. In addition, it is also possible to apply to tube printing of an aluminum tube, a plastic tube, a laminated tube, etc. Before printing, for example, a sizing process for improving the adhesion to the ink or a white coating process for improving the reproducibility of the printing may be performed. After printing, a coating device may be provided to apply a finishing varnish or the like to protect the ink. Further, a drying device using hot air or ultraviolet light may be provided. As shown in FIG. 2, the shaft 2 of the impression cylinder 1 has bearings 22 at both ends thereof on a frame 21 of a sheet-fed printing press 20.
And is rotatably held via the. A drive gear 23 is coaxially attached to one end. Outer peripheral surface 3 of impression cylinder 1
As shown in FIGS. 2 and 3, two notches 4 extending parallel to the axis 2 of the impression cylinder 1 and extending to both ends of the impression cylinder 1 are formed to face each other. The two notches 4 divide the outer peripheral surface 3 into two approximately equally into an outer peripheral surface 3 ′ and an outer peripheral surface 3 ″. Further, a claw device 5 is incorporated in the notch 4. The claw device 5 is for gripping the sheet 10 to be printed, and has six claws 6 along the longitudinal direction of the notch 4 in the same direction with respect to the circumferential direction of the impression cylinder 1 and at substantially equal intervals. Are located. The claw 6 is connected to a rotation shaft 7 in the notch 4, and is rotated simultaneously with the rotation of the rotation shaft 7. The gripping and release of the printing target sheet 10 is performed by the rotation of the nail 6. The control regarding the rotation of the pawl 6 is performed by a control unit (not shown) of the sheet-fed printing press 20. After the sheet to be printed is transferred to the first intermediate cylinder 41, the claw 6 of the impression cylinder 1 and the
It is delivered to the next claw 6 of the impression cylinder 1 of the printing device 52 via the second claw. In this way, the printing target sheet 10 is delivered to the respective claws in the process of sequentially traveling through the printing devices 51 to 54. A film 8 is wound on the outer peripheral surfaces 3 'and 3''of the impression cylinder over substantially the entire peripheral area. The two films 8 have substantially the same shape, the length in the axial direction of the impression cylinder 1 is substantially the same, and the shape avoids the claws 6. Therefore, the film 8 does not hinder the rotation of the claw 6. The film 8 may be made of a material having a function of protecting the outer peripheral surface 3 of the impression cylinder 1. For example, the film 8 is made of plastic, polyurethane, or other resin, and is made of a single layer. The film 8 has a thickness of, for example, 0.1
It is as thin as about 6 mm. When such a thin thing is used, an increase in the peripheral speed can be suppressed. In addition, when a material having wear resistance is used, the replacement time of the film 8 can be lengthened. As shown in FIG. 4, the film 8 causes the printing sheet 10 to be sequentially transferred from the intermediate cylinder 40 to the impression cylinder 1, that is, to the outer peripheral surface 3 of the impression cylinder 1 which is beaten by the rear end face 11 of the printing sheet 10. And the film 8 is less likely to be scratched due to the durability of the film 8. Therefore, the life of the impression cylinder 1 can be significantly improved (extended). Further, if the film 8 is scratched due to long-term use,
Only replacement replacement is sufficient, handling and repair become easy,
The time spent for repair work can be reduced.
Further, it is possible to reduce a problem that causes a printing trouble due to the deterioration of the outer peripheral surfaces 3 ′ and 3 ″ of the impression cylinder 1. Further, since the film 8 is composed of a single layer, and the film 8 itself has no direction in front and back, when attaching the film 8 to the outer peripheral surfaces 3 ′ and 3 ″ of the impression cylinder 1, It is not necessary to consider which side of the film 8 is the front side, the film 8 can be easily mounted, and mounting errors on the mounting surface of the film 8 itself can be avoided. Furthermore, since it is a single layer, the film 8
Are also inexpensive and easily available, so that costs can be reduced. In addition, two films 8 are used for one impression cylinder 1. However, since both have the same shape, only one kind of the film 8 is required in advance, so that the management of the film 8 is reduced and cost is reduced. Contribute. Further, it is possible to avoid mounting mistakes of the film 8 which occurs in various cases, and it is possible to reliably perform the replacement. Furthermore, depending on the location of the scratch on the film 8,
It is not necessary to replace the film 8 on the entire outer circumferential surfaces 3 'and 3''of the impression cylinder. In some cases, it is sufficient to replace only one of the films 8, and waste of the film 8 can be prevented. The film 8 is attached to the outer peripheral surface 3 of the impression cylinder 1 with a peelable adhesive 9. Thus, the film 8
When the film is wound so as to be peelable, the film 8 can be easily removed without using a special tool.
Therefore, the outer circumferential surface 3 ′ of the impression cylinder 1 is changed during the exchange of the film 8.
3) It is possible to reduce considerations for preventing scratches on 3 ″, and further facilitate repair work. The adhesive is
Even if it is used for the outer peripheral surface 3 ′, 3 ″ of the impression cylinder 1, the outer peripheral surface 3 ′,
It is preferable to use a material that does not deteriorate 3 ″. Instead of an adhesive, a peelable double-sided tape or the like may be used. In this embodiment, the outer peripheral surface 3 of the impression cylinder 1
Is divided into two, but the present invention can also be applied to a case where the impression cylinder 1 is equally or unequally divided into a larger number. In addition, the present embodiment can be applied to a case where the sheet to be printed 10 is paper. In the present embodiment, the case of single-sided printing is used, but the present invention can also be applied to the case of double-sided printing. According to the present invention , the two cylinders are arranged in parallel with the axis of the impression cylinder.
The outer periphery of the impression cylinder is formed by two notches extending to the ends.
The surface is almost equally divided into two, and holds the printing target sheet
A claw device is incorporated in the notch, and
Is a flat metal sheet having elasticity.
To protect the outer peripheral surface of the impression cylinder from scratches
A film composed of a single layer of the same type is wound around each outer peripheral surface divided into two substantially equally , and the film is peelable.
Runode with an adhesive or the like is affixed to the outer peripheral surface of the impression cylinder, before
For each film scratched by the metal sheet
It can be replaced. The length of the film is almost half the circumference of the impression cylinder
It is about, and only paste the film with scratches
It is sufficient to change the
Can be. Therefore, the repair work for avoiding the printing trouble and the deformation of the sheet to be printed can be performed easily, quickly, reliably and at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view conceptually showing the entire sheet-fed printing press. FIG. 2 is a plan view of the impression cylinder in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2; FIG. 4 is a front view conceptually showing a positional relationship between an impression cylinder, a blanket cylinder, and a sheet to be printed in FIG. FIG. 5A is a diagram partially showing a plurality of sets of conventional printing apparatuses, and FIG. 5B is an enlarged view of a portion 5b in FIG. 5A. [Description of Signs] 1 Impression cylinder 2 Shaft 3, 3 ', 3''Outer peripheral surface 4 Notch 5 Claw device 6 Claw 7 Rotating shaft 8 Film 9 Adhesive 10 Sheet to be printed

Claims (1)

(57) [Claims] [Claim 1] Rotatably held on a frame of a sheet-fed printing press
The printing surface of the running printing sheet is
Work to transfer ink and print on the impression cylinder of a sheet-fed printing press.
And two notches extending to both ends parallel to the axis of the impression cylinder.
Therefore, the outer peripheral surface of the impression cylinder is substantially equally divided into two parts,
A claw device that holds the print sheet is built into the notch
Is, the printing sheet is a plate-like metallic thin plate having elasticity, the outer peripheral surface of the impression cylinder from scratches by said thin metal plate
For protection, the same is applied to each of the outer peripheral surfaces
Each of the films consisting of one layer is wound and
LUM is affixed to the outer peripheral surface of the impression cylinder with a peelable adhesive.
Film that has been scratched by the metal sheet
An impression cylinder for a sheet-fed printing press, wherein the impression cylinder can be replaced every time .