JPH0435947A - Multicolor offset printing press - Google Patents

Abstract

PURPOSE:To decrease the length of a device body and to improve an operability in printing by a method wherein a plurality of dampening rollers and a plurality of inking parts are provided on a carriage correspondingly to plate platens, and a blanket cylinder is provided with a diameter of an integral multiple of that of the impression cylinder. CONSTITUTION:On the center of a device body 11, a plurality of (two) plate platens 13, 14 are adjacently disposed. A paper supply part 15 and a paper discharge part 16 are vertically disposed to one end of one of the plate platens. An impression cylinder 17 is disposed between the parts 15, 16 and the plate platens in proximity of the parts 15, 16. Two fixed dampening rollers 18, 19 are disposed to one end of the other plate platen correspondingly to the respective plate platens. A carriage 12 is provided with a blanket cylinder 20, a plurality of (two) inking parts 21, 22 consisting of a plurality of rollers, and a plurality of (two) dampening rollers 23, 24 consisting of a plurality of rollers. The magnitude, i.e. the diameter, of the blanket cylinder 20 is determined to be an integral multiple of that of the impression cylinder 17 in accordance with the number of colors in multicolor printing.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a multicolor printing apparatus that uses circular pressure offset printing suitable for proof printing or special printing, and that enables multicolor printing in a small space as a whole.

[Prior art]

In general, this type of circular pressure offset printing device is
A device having the configuration shown in FIG. 4 is well known as a conventional example. In this conventional example, 1 is a plate surface plate, and a plate or a plate 2 is placed and held on the plate surface plate. A press plate 3 is disposed adjacent to the plate plate 1 at a predetermined interval, and a printing paper 4 is placed on the press plate and is printed by transfer using a blanket cylinder 5. In the vicinity of this blanket cylinder 5, rollers 6 for the swimsuit and rollers 7 for the ink coat are disposed, and a large number of kneading roller groups 8 are in contact with the rollers for supplying the ink in an appropriate state. These are arranged in the rack gear θ together with the blanket cylinder 5.
It can be called a so-called blanket unit 10 that moves back and forth on the top. In the case of multicolor printing, a plurality of the blanket units 10 are arranged in parallel, and a corresponding plurality of plate plates 1 are also required, and these plate plates are also arranged in parallel. This requires a large space as a whole. When the blanket unit 10 is driven in this arrangement, it reciprocates from its stop position or set position between the plurality of plate plates 1 and pressure plates 3 and prints. It has become necessary.

[Problem M that the invention attempts to solve]

In a conventional example with such a configuration, the plate surface plate 1 and the plate surface plate 3 are arranged at a predetermined interval, and in the case of multicolor printing, a plurality of blanket units 10 and the plate surface plate 1 are arranged.
Since it is necessary to further install the blanket unit 10 in parallel, the amount of movement of the blanket unit 10 becomes longer, which not only results in poor workability, but also increases the size of the entire device. However, there are problems that must be solved in order to make the device smaller and more compact and to improve workability.

[Means for Solving the Problems] As a specific means for solving the problems of the conventional example, the present invention provides a device comprising a device main body and a carriage that reciprocates on the device main body. In addition to disposing the plate plates adjacent to each other, a paper feeding section having a paper feeding guide section on one end side and a paper discharging section having a paper discharging guide section are provided in the vertical direction, and these paper feeding guide sections and an impression cylinder of a roller cane is disposed between the carriage and the paper discharge guide section, and the carriage is provided with a plurality of dampening rollers corresponding to the plate surface plate and a plurality of inking sections;
A multicolor offset printing device is provided, characterized in that a blanket cylinder is arranged, the blanket cylinder has a diameter that is an integral multiple of the impression cylinder, and a plurality of plate plates are arranged adjacently. This allows the length of the device body to be significantly shortened and the device to be smaller and more compact. In addition, the impression cylinder is equipped with a paper holding section to hold the paper, and the impression cylinder is continuously rotated multiple times during one rotation of the blanket cylinder to perform overlapping printing, which significantly improves printing work efficiency. It is improving. [Example] Next, the present invention will be explained in more detail with reference to the illustrated embodiment. In the illustrated embodiment, a two-color printing apparatus is shown, and in the same figure, numeral 11 is the main body of the apparatus; A carriage 12 is disposed at the top of the main body so as to be movable along a predetermined rail in the direction indicated by arrow a. In the main body 11 of the apparatus, a plurality of (two) plate plates 13 and 14 are arranged adjacent to each other in the center thereof, and a paper feed section 15 and a paper discharge section 16 are arranged near one end. Located above and below,
An impression cylinder 17 is disposed close to these and between it and the plate surface plate. Near the other end, two fixed dampening rollers 18 and 19, corresponding in number to the platen, are disposed, and each of these fixed dampening rollers is connected to a plurality of roller groups and an ice storage tank. It is configured. The carriage 12 includes a blanket cylinder 20, a plurality of (two) inking units 21 consisting of a plurality of roller groups,
22 and a plurality (two) of dampening rollers 23 and 24 consisting of a plurality of roller groups, and two ink supply tanks 2 for supplying ink to the inking section, respectively.
5,26. The size of the blanket cylinder 20, that is, the diameter thereof, is set to be an integral multiple of the impression cylinder 17 depending on the number of multicolor printing. In the illustrated embodiment, the size is doubled because it is two-color printing, but if it is three-color printing, it will be three times the size, and if it is four-color printing, it will be four times the size. Therefore, the number of inking units, dampening rollers, and platens is determined by the size of the blanket cylinder relative to the impression cylinder. Further, the plate surface plate 13.14 is connected to the blanket cylinder 20.
The height of the adjustment means 13a, 14a in relation to
This allows for fine adjustments. Further, the paper feeding section 15 is provided with a sucker 27 and a paper feeding guide section 28, and the paper discharging section 16 is provided with a paper discharging guide section 29.
A predetermined paper 30 is supplied from the paper feed section 15 to the impression cylinder 17,
After predetermined printing, the sheets are sequentially discharged to the paper discharge section 16. The blanket cylinder 20 and the impression cylinder 17 are constructed as shown in FIG. That is, the blanket cylinder 20 has a blanket 20a on which ink is placed around its circumferential surface, a mouth tension bar 20b is attached to one end of the blanket cylinder 20, and a mouth tension bar 20c is attached to the other end of the blanket cylinder 20. Recessed portion 2Od of body 20
By being tightened within the blanket 20a
is wrapped in tension. This blanket body 20
The configuration is substantially the same as the conventional example. The impression cylinder 17 is formed not in a flat plate but in a roller shape, and is
A recessed portion 17a is formed in a part of the holding portion of the paper sheet, and a gripping claw 17b and a claw rest 17c are provided facing this recessed portion. It is configured to hold the paper 30 that is supplied to the impression cylinder 17. Further, the paper feed guide section 28 includes a front member 31 and a needle registration section 3 in order to appropriately feed the paper to the impression cylinder 17.
2 is provided. These structures are also similar to conventional paper feeding devices.

[Explanation of operation]

The multicolor offset printing device of the present invention having the above configuration includes:
The plate placed and fixed on plate plate 13 is the first color, and plate plate 1
The plate placed and fixed on plate 4 is set as the second color, and the carriage 12 is moved to apply inks corresponding to the plates on these plate plates from inking units 21 and 22. In the king section, the inking section 21 supplies the first color ink, and the inking section 22 supplies the second color ink.This ink supply is performed by moving the carriage 12 toward the left in the figure. When the inking unit is positioned on the corresponding plate surface plate, each inking unit descends together with the corresponding dampening roller to apply ink onto the corresponding plate. The surface of the plate on the platen 13 is moistened with a dampening roller 23 and then ink is applied in the inking section 21, and the surface of the plate on the platen surface plate 14 is moistened with a dampening roller 24 and then ink is applied with the inking section 22. The carriage moves while applying ink, and after each inking section passes over each corresponding plate surface plate, each inking section rises so as not to affect the plates on other plate surfaces at all. When 12 is moving to the left,
The blanket cylinder 20 has risen to a position where it does not come into contact with each plate surface plate, and when it passes the plate surface plate and comes to the position shown in FIG. Each dampening roller 23,24 abuts a corresponding stationary dampening roller 18,19 to replenish previously consumed water, after which the carriage 12 moves to the right. By this movement to the right, the trunk 20 ; 6f
Each plate continuously contacts and rolls against the plate on the surface plate, and the ink from each plate is transferred to each half of the circumference and the receiver is removed.
It will come to the position shown in Figure 1. In this position, the blanket cylinder 20 and the impression cylinder 17 are brought into contact with each other, and the paper 30 is previously fed to the impression cylinder, and the end thereof is held by the claw stand 17c and the gripping claw 17b. When the blanket cylinder 20 and the impression cylinder 17 rotate in the direction indicated by the arrow in this contact state, the first color is first printed on the paper 30 held by the impression cylinder 17. This first color printing is performed by one revolution of the impression cylinder 17,
Blanket cylinder 20 has only made a half turn. Then, as the blanket cylinder 20 further rotates by half a rotation, the impression cylinder 17 also rotates one more time to overprint the second color. In short, when the blanket cylinder 20 rotates once, the impression cylinder 17
rotates twice in succession, and the first rotation of the impression cylinder 17
The first color is printed in one rotation, and the second color is continuously overprinted on the same paper 30 in the next rotation. Then, just before the impression cylinder 17 completes its second rotation, the jaw 1
7b opens the end of the paper 30, discharges the printed paper to the paper discharge section 16 via the paper discharge guide section 29, and
7b is ready to hold a new sheet for the next process, and the impression cylinder 17 stands by at a predetermined position. and,
The carriage 12 repeatedly performs the above-described process, and this process is one process of two-color printing, and by repeating this process, sequential printing is automatically performed.

【Effect of the invention】

As explained above, the multicolor offset printing device according to the present invention includes a device main body and a carriage that reciprocates on the device main body, and has a plurality of plate plates adjacent to each other in the center of the device. At the same time, a paper feeding section having a paper feeding guide section on one end side and a paper discharging section having a paper discharging guide section are provided in the vertical direction, and between the paper feeding guide section and the paper discharging guide section. a roller-shaped impression cylinder is disposed on the carriage, a plurality of dampening rollers and a plurality of inking sections corresponding to the plate surface plate are disposed on the carriage, and a blanket cylinder is disposed on the carriage;
By configuring the Plunke-Soto cylinder to have a diameter that is an integral multiple of the impression cylinder, it is no longer necessary to provide a blanket cylinder, plate plate, and pressure plate for each printing color, as in the conventional example. As a result, the length of the main body of the apparatus can be significantly shortened, and the entire printing apparatus can be made smaller and more compact, which is an excellent effect. In addition, the impression cylinder is equipped with a paper holding section to hold the paper, and the impression cylinder is continuously rotated multiple times during one rotation of the blanket cylinder to perform overlapping printing, which significantly improves printing work efficiency. It also has the excellent effect of improving

[Brief explanation of drawings]

FIG. 1 is a side view schematically showing a multicolor offset printing apparatus according to the present invention, FIG. FIG. 3 is a schematic side view of the waist section of the printing apparatus showing a state in which the carriage is moved, and FIG. 4 is a schematic diagram showing the main parts of the conventional example. 11... Apparatus body 12... Carriage 13, 14... Plate plate 15... Paper feed section 16... Paper discharge section 17... . . . Impression cylinder Fig. 4 18, 19 . . . Fixed dampening roller 20 . . . Blanket cylinders 21, 22 . . . Inking section 23, 24 . Roller 28... Paper feed guide section 29... Paper discharge guide section 30... Paper patent applicant Toppan Printing Co., Ltd.

Claims (2)

[Claims] (1) Consists of an apparatus main body and a carriage that reciprocates on the apparatus main body, and the apparatus main body has a plurality of plate surface plates adjacent to each other in the center thereof, and one end side A paper feeding section having a paper feeding guide section and a paper discharging section having a paper discharging guide section are provided in the vertical direction, and a roller-shaped impression cylinder is disposed between the paper feeding guide section and the paper discharging guide section. , the carriage is provided with a plurality of dampening rollers and a plurality of inking units corresponding to the plate surface plate, and a blanket cylinder is provided, and the blanket cylinder has a diameter that is an integral multiple of the impression cylinder. A multicolor offset printing device featuring: (2) Providing a paper holding section on the impression cylinder to hold the paper;
2. The multicolor offset printing apparatus according to claim 1, wherein the impression cylinder is continuously rotated a plurality of times during one rotation of the blanket cylinder to perform overlapping printing. 3. The multicolor offset printing apparatus according to claim 1, further comprising a fixed dampening roller provided at the other end of the apparatus main body.