JPS6212599Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an offset printing machine equipped with a plate-making device, in which a device for making a master paper (original plate) wound around a plate cylinder is incorporated.

Offset printing machines exhibit excellent functionality for making many copies of a single original, but unlike general copying machines, they cannot be used to directly use originals for the purpose of making copies. For example, in order to reproduce several pages of a book, it is necessary to make a master paper of the same number as the number of pages, and then print based on the master paper. In this way, in order to obtain copies from a large number of different manuscripts, troublesome operations such as master plate making and master removal from the plate cylinder are required the same number of times as the number of manuscripts mentioned above. Printing a large number of different documents in a continuous operation is extremely inefficient.

For this reason, in recent years, an offset printing press with a plate-making device has been developed in which a printing unit and a plate-making unit are connected in series to enable continuous operations from plate-making to printing. As this offset printing machine equipped with a plate-making device, there are known ones in which a plate-making unit is connected to the side of the printing unit (○), and one in which a plate-making unit is connected to the top of the printing unit (○). In this case, the following problems occurred.

That is, since the offset printing press with a plate-making device shown in ○B has a horizontally elongated shape, the device requires a large floor area, and the interior space cannot be used efficiently. The offset printing press with a plate-making device shown in (b) is advantageous in terms of space, but it is inconvenient for maintenance, inspection, alignment of documents, etc. That is, in an offset printing machine equipped with a plate-making device, the work frequency of making a master paper from a manuscript and the work frequency of printing with the master paper made from a master paper are, for example, 1
As in the case of printing 1,000 sheets using one sheet of master paper, there are extreme differences, and since the latter is far more frequent, problems mainly occur on the printing unit side. Therefore, the majority of maintenance and inspection work is performed on the printing unit, but with conventional machines that have a prepress unit mounted on top of the printing unit, it is difficult to bend down and look inside the printing unit every time a problem occurs. You are forced into an awkward position, and maintenance and inspection are extremely troublesome. In addition, because the plate-making unit is located high, depending on the physique of the worker, it may be difficult to look down at the top surface of the transparent glass on which the original is placed, making it difficult to place the original in the correct position on the transparent glass. There are some serious drawbacks.

In addition, in both ○A and ○B, the used master paper can be taken out of the machine, but the master paper before use is configured to be automatically fed from the plate-making unit to the printing unit. It is difficult to take it out directly from the plate making unit. For this reason, when a large number of sheets are to be printed and printing takes a long time, it is necessary to stop the plate-making unit, and when a large number of master papers are made, there is a loss in working time.

The present invention provides an offset printing machine with a plate-making device that can solve these problems.

Hereinafter, embodiments of the present invention will be described based on the drawings. A is a plate making unit, and B is a printing unit connected above it.

At the upper center of the plate-making unit A, there is a drawer-type document platform 3 having a transparent glass 1 at the bottom and a document holding plate 2 pivotally attached to the transparent glass 1, which can freely swing vertically. Pull out the platform 3 forward, raise the presser plate 2, and place the original on the top surface of the transparent glass 1, aligning it with the positioning mark displayed on the bottom surface of the transparent glass 1. The document is set at a predetermined position inside the plate-making unit A by lowering the presser plate 2 and pushing the mounting table 3 into the predetermined position. A plate holder 4 is provided on one side of the plate making unit A.
The master papers M on the table 4 are conveyed one by one to the right by feed rollers 5a, 5b, and 5c. The master paper M has an insulating layer of photoconductive material and the rollers 5a, 5b, 5
While being conveyed by c, the corona discharge electrode 6
A charge is applied by a charging device 6 consisting of a ground plate 6b and the like. Master paper M subjected to electrostatic charge
When the rollers 5a, 5b, 5c and the endless belt 7 come to a predetermined position on the endless belt 7, the rollers 5a, 5b, 5c and the endless belt 7 stop. At the same time, the exposure device 8 moves along the top surface of the master paper M,
Project the original image onto the front surface. When the exposure device 8 returns to its original position, the endless belt 7 starts moving again, and the master paper M having the electrostatic latent image is fed into the developing device 9. The visible image on the master paper M developed with toner resin powder in the device 9 is heated and fixed by the fixing device 10, and then fixed on the endless belt 11.
is sent out of the fixing device 10. A guide 12 is provided at the end of the conveyance of the endless belt 11, and the conveyance direction can be switched up or down.If you wish to perform plate making regardless of printing, you can move the master paper M by keeping the guide 12 facing downward. Since the master paper M is fed into the plate receiving case 13, the master paper M accumulated in the case 13 can be manually taken out. When performing printing, by switching the guide 12 upward, the master paper M is conveyed by the conveyor 14 toward the upper printing unit B.

The printing unit B is provided with a pedestal 15 for the stencil-made master paper M, and a feeding conveyor 16 for automatically feeding the master paper M from the conveyance terminal end of the conveyor 14 to the pedestal 15. When the guide 12 is switched upward, the master paper M made by the plate making unit A is continuously fed to the pedestal 15, but the feed conveyor 16 is not driven. Instead, it is also possible to manually feed the master paper M in the plate receiving case 13 or produced by another plate making machine to the receiving stand 15. The feeding conveyor 16 includes an endless belt 16a and a presser roller 1.
6b etc., near the upper end, that is,
The endless belt 16a, which is located near the pedestal 15, can swing outward about the supporting shaft of the hanging wheel 16c, and by swinging it outward, the printing paper storage chamber described later can be opened. 25 will be released.

The printing unit B is also provided with a feeding device 20 including a stacker 17, an air suction section 18, a conveyor 19, etc. so that the direction of movement of the master paper M from the pedestal 15 is opposite to the direction of movement in the plate making unit A. is provided, and the stacker 1
7 and the conveyor 19, an etching device 21 is installed.
is provided. Therefore, the master papers M on the pedestal 15 are deposited on the stacker 17, and when necessary, the air suction section 18 feeds out the master papers one by one starting from the lowest one, and sends them out to the etching device 21.
After being desensitized by
At step 9, it is fed to the plate cylinder PC. The plate cylinder PC is loaded with the leading edge of master paper M held between the plate cylinders.
A known automatic loading device (not shown) is installed which winds the master paper M onto the plate cylinder PC by rotating the PC in the direction of the arrow, and ink is applied to the master paper M wound around the plate cylinder PC. applied.
22 is a humidifying device that supplies dampening liquid to the plate cylinder PC;
2a is a moisture supply bottle, and 23 is an inking device. BC is a blanket cylinder, IC is an impression cylinder, 24 is a blanket cleaner, and 24a is a cleaning bottle.

A printing paper storage chamber 25 is provided below the etching device 21, and by swinging the feeding conveyor 16 outward, the storage chamber 25 is opened to the side. A predetermined amount of printing paper P can be inserted into the storage chamber 25 from this section. Reference numeral 26 denotes an air suction unit for sending out the printing paper P one sheet at a time starting from the top layer, and 27 is a conveyor. This constitutes a paper feeding device 28 that feeds each paper.

The ink image on the master paper M is transferred to the blanket cylinder BC and printed on the printing paper P supplied between the blanket cylinder BC and the impression cylinder IC as follows.
This is the same as a general offset printing machine, and the finished paper is discharged onto a paper discharge table 30 by a known paper discharge device 29. On the other hand, one piece of master paper M
After a predetermined number of sheets have been printed, when the grip is released by the automatic mounting device, the leading edge of the master paper M comes off the plate cylinder PC and is discharged to the plate discharge table 32 via the known plate discharge device 31. When the master paper M is discharged, the blanket cleaner 24 is activated to clean the peripheral surface of the blanket cylinder BC.

In the figure, 33 is a drive motor for each part of the plate making unit A, 34 is a drive motor related to the conveyor in the printing unit B, 35 is a drive motor for the etching device 21, and 36 is a plate cylinder PC, a blanket cylinder.
BC, a motor for driving the impression cylinder IC, etc., 37 is an air pump used for the air suction parts 18 and 26,
38 is a driving motor.

The offset printing press with a plate-making device of the present invention, which has the above configuration, has the plate-making unit located below the printing unit, so it is not only advantageous in terms of space, but also requires much less work than the plate-making unit. Therefore, the position of the printing unit, which is prone to problems such as paper jams, is high, and when a trouble occurs, there is no need to take an awkward position such as bending over, making maintenance and inspection extremely easy. be able to. Furthermore, although the printing unit is located above the plate-making unit, the original table is structured as a drawer type with a transparent glass bottom that can slide freely in the front and rear directions, so there is no problem in putting in and taking out originals. , the transparent glass is positioned at about waist height, allowing the worker to look down at the top of the transparent glass even while sitting on a chair, and to easily and accurately place the original on the transparent glass. It can be placed at a fixed position.

Furthermore, the plate making unit includes a conveyor that conveys the master paper sent out from the fixing device upward, a plate receiving case located below the conveyor, and a guide for switching the conveyance path between the conveyor side and the plate receiving case side. The printing unit is equipped with
Since a master paper pedestal and a conveyor for feeding the master paper from the conveyance end of the conveyor to the pedestal are provided, plate making and printing can be performed as a continuous operation by keeping the guide facing upward. In addition, by switching the guide downward, plate making can be performed independently of printing.For example, master paper taken out from the plate receiving case can be manually fed to the receiving stand, or It can also be used with another printing machine, and there is no need to stop the operation of the plate-making unit during printing, allowing for efficient use of limited working time.

Furthermore, the space formed below the etching device is laterally closed off by the feeding conveyor, but in the present invention, the feeding conveyor is moved outward with the vicinity of its upper end serving as a fulcrum. By configuring the printer to be able to swing in the opposite direction, the space can be effectively used as a printing paper storage chamber.

[Brief explanation of the drawing]

The drawings show one embodiment of the actual device, with FIG. 1 being a front view and FIG. 2 being a side view of the main parts. 1...Transparent glass, 3...Document stand, 5a,
5b...Feeding roller, 6...Charging device, 8
... Exposure device, 9 ... Development device, 10 ... Fixing device, 12 ... Guide, 13 ... Plate receiver case, 14
... conveyor, 15 ... pedestal, 16 ... feeding conveyor, 20 ... feeding device, 21 ... etching device, 22 ... humidification device, 23 ... inking device, 24 ... blanket cleaner , 25...
Printing paper storage chamber, 28...Paper feeding device, 29...Paper discharging device, 30...Paper discharging table, 31...Plate discharging device, 3
2...Discharge table, PC...Print cylinder, BC...Blanket cylinder, IC...Impression cylinder, M...Master paper,
P...Printing paper.

Claims (1)

[Scope of utility model registration request] It has a drawer-type document platform with a transparent glass bottom that can be slid forward and backward.Below the platform, there is a feed roller that transports the master paper to the projection position, and a roller that transports the master paper to the projection position. A charging device for charging, an exposure device for projecting a document image onto a master paper subjected to a charging action, a developing device for developing an electrostatic latent image on the master paper formed by the device, and a developing device. A plate-making unit equipped with a fixing device for fixing the visible image on the master paper that has been made is provided, and above the plate-making unit there is a pedestal for the stencil-made master paper, and a plate cylinder for holding the master paper on the pedestal. A feeding device that feeds the master paper, an etching device that desensitizes the master paper during feeding,
An automatic loading device for winding master paper around the plate cylinder, a moisture supply device and inking device that supply dampening liquid to the plate cylinder, a blanket cylinder, an impression cylinder, and a printing paper storage provided below the etching device. a paper feeder that feeds the printing paper in the storage chamber between the blanket cylinder and the impression cylinder, a paper ejection device that ejects the printed paper onto the paper ejection table, and ejects the master paper on the plate cylinder onto the plate ejection table. A printing unit equipped with a plate discharge device is installed in series, and the plate making unit includes a conveyor that conveys the master paper sent out from the fixing device upward, a plate receiving case located below the conveyor, and a conveyance path connected to the conveyor. The printing unit is provided with a feed conveyor for feeding the master paper from the transport end of the conveyor to the holder near the upper end. The plate-making device is configured to be able to swing outward using the feeding conveyor as a fulcrum, and to open the printing paper storage chamber by swinging the feeding conveyor outward. offset printing machine.