JPS63227342A - Inking arrangement of flat-bed printing press - Google Patents

Abstract

PURPOSE:To simplify the supply and replenishment of ink and the washing operation of an inking arrangement, by providing a plurality of inking units each constituted of a pair of ink distributing rollers forming an ink fountain therebetween. CONSTITUTION:An inking arrangement 20 has a plurality of inking units each consisting of a pair of ink distributing rollers 21, 22 mutually rotating in opposite directions and forming an ink fountain therebetween. Further, a plurality of these inking units are combined with the shaking roller 11 and ink ductor 10 provided to a main body frame 1 and supply printing ink to the ink roller of the stand. Ink lead-out quantity can be adjusted by the contact pressure between the ink distributing rollers 21, 22, the lead-out number of times of the ink ductor 10 and the contact time of the ink distributing roller 21 and the ink ductor 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a flatbed printing press. The present invention relates to an inking device that is an ink supply device, and particularly to an inking device for a printing press that is excellent as a proofing device.

(Prior art) Before the actual printing called 9-printing in plate-making printing work, proof printing is performed to inspect the printing plate obtained by plate-making and to obtain a standard print for the actual printing. is commonly done.

Since this proof print is an inspection of two prints, it is desirable that it be printed under conditions similar to those of five prints. In other words, it is better to use the main printing press for proof printing, but the double printing press is not designed to be convenient for printing small quantities like double proof printing, and the efficiency of the printing press is also limited. For operational reasons, the second proof printing is performed by a printing machine for second proof printing, that is, a proofing machine.

Furthermore, even if it is not a proof but a 3rd printing, the small number of copies is 1.
For example, when printing 500 copies or less, it is not economical to operate a single printing press.

Printing is done by a proofing machine.

Flatbed printing machines such as proofing machines generally use ink rollers.

A dampening water device (if not installed or even if installed, do not use it) at both ends of the frame containing the water roller (sometimes it is not installed or even if it is installed) and the blanket cylinder. (in some cases), and an inking device or a swing roller (rider roller) for applying ink to the ink roller.

This is one of the important factors that affects the printing results when making proofs using a proofing machine or making small copies.

There is a problem with the amount of ink applied to the ink roller.

A general proofing machine has a rider roller for applying ink to the ink roller, and the ink is manually applied to the rider roller, that is, the ink is averaged and applied by hand. That is, by applying ink to the rider roller with a spatula, ink is supplied, replenished, and the thickness of the ink film on the roller is adjusted. This means that the management of the amount of ink supplied to the ink roller relies on the experience of two workers. Therefore, in order to obtain printed matter with stable quality per amount of ink, skill is required, and work errors are likely to occur before the printed material is printed with a constant amount of ink, resulting in poor work efficiency.

Also, proofing machines equipped with an inking device are known, but since this inking device is similar to a two-press printing machine, if it is attached to a conventional proofing machine, it will not work as an inking device. Requires expensive equipment to be installed.

Flatbed printing machines such as proofing machines generally print in a single color, or one color. When performing color printing, which is multicolor printing, first, after printing the first color, the printing machine is stopped and cleaned, especially inking. Clean the device and start printing the second color. By repeating this process as many times as necessary, multicolor printing can be achieved.

Therefore, multicolor printing using a flatbed printing machine such as a double proofing machine takes a considerable amount of time and labor, and the reality is that it is not possible to obtain multicolor printed matter quickly and easily.

Note that there is also known an attempt to perform multicolor printing using a flatbed printing machine without stopping the printing press in the middle of multicolor printing. For example, it may be possible to perform continuous multicolor printing with a printing machine using the inking device shown in Japanese Patent Publication No. 49-3.5722, but the space of the device tends to be large and cleaning Also, it is not always easy to supply or replenish ink; that is, since the ink mixing devices are arranged radially, a horizontal space is required. Although the space in the height direction may be small, the space in the height direction is rarely a problem, but the space in the horizontal direction is. Also,
When cleaning the inking device or supplying or replenishing ink, the operating side, which is the direction in which the inking device is operated, is generally limited to one side, so there is a problem in that it is difficult to operate due to the structure.

Furthermore, it is known that an ink fountain in a direct printing type flatbed printing machine utilizes space between rollers.

This is a special printing machine that is different from ordinary planographic printing machines such as offset printing, and it does not perform multicolor printing.

(Problems to be Solved by the Invention) From these points of view, the present invention provides a flatbed printing machine that is generally used as a 9 proofing machine or a printing machine for small quantity copies.
Ink supply using a relatively simple device.

This is an attempt to solve the above problem.

"Structure of the Invention" (Means for Solving the Problems) The present invention provides a flatbed printing machine in which a frame including an ink roller and a blanket cylinder is run on a main body frame provided with an inking device at at least one end. The inking device includes a plurality of inking units each consisting of a pair of ink mixing rollers, which are two rollers that rotate in opposite directions, and an ink fountain is formed between the rollers. Furthermore, by arranging a plurality of inking units in the vertical direction and raising or lowering them, there is an inking device that can supply ink from another inking unit to an ink calling roller, and an inking device that can supply ink from another inking unit to an ink calling roller. A means for determining the height position of the ink supply is provided for each inking unit and the main body frame, and the inking device that controls the height position of the ink supply and each inking unit can be pulled out to the operating side. It is an inking device.

Hereinafter, nine embodiments of the present invention will be described based on the drawings.

FIG. 1 is a side view showing an outline of a flatbed printing press according to the present invention. A dampening device 2 and an inking device 20 are installed at both ends of the main body frame 1, and a blanket 4. A frame 3 including a water roller 5 and an ink roller 6 runs. The main body frame 1 is provided with a plate plate 7 and a paper plate 8. A printing plate is mounted on the plate surface plate 8, and a printing material is mounted on the paper surface plate 8, dampening water and ink are applied to the printing plate, and the ink on one plate surface is transferred to the printing material via a blanket. It is used for printing. Note that 9 indicates a paper discharge tray. Furthermore, the dampening water device and the water roller may not be installed, or even if installed, the device may not be used.

FIG. 2 is a side view for explaining an inking device portion of a flatbed printing press according to the present invention.

The inking device 2o according to the present invention has a plurality of inking units each consisting of a pair of ink mixing rollers 21 and 22, which are two rollers that rotate in opposite directions to each other, and the space between the rollers serves as an ink fountain. Furthermore, the plurality of inking units are combined with the swinging roller 11 and the ink feeding roller 10 provided on the two main body frames 1, and supply printing ink to the ink roller of the gantry.

Note that the inking device may refer not only to the inking unit, but also to include the inking unit, the ink feeding roller 10, and the swinging roller 11.

An ink fountain is formed between the ink mixing rollers 21 and 22 and holds a predetermined amount of ink. Ink mixing roller 21,
It is preferable that the rotational speeds of 22 can be set arbitrarily. Note that although the rotational speeds of the ink mixing rollers 21 and 22 are usually the same, they can be changed slightly since the ink is transferred to the ink drawing roller 10. Also, the ink mixing rollers 21 and 22.

By keeping the ink fountain constantly rotating during printing, it is possible to prevent the ink from forming a film on the surface of the ink fountain.

The amount of ink discharged can be adjusted by the contact pressure between the ink mixing rollers 21 and 22, the number of times the ink drawing roller 10 is called, the contact time between the ink mixing roller 21 and the ink drawing roller 10, and the like.

Note that the ink mixing rollers 21 and 22 are provided with two normal weir plates to prevent ink from spilling.

In the inking device of the present invention, during printing.

Any inking unit can come into contact with the ink drawing roller 10. Therefore, the plurality of inking units may be arranged vertically and configured to be movable vertically, ie, raised or lowered, or may be arranged in other ways. However, from the viewpoint of space, ease of cleaning, ease of ink supply work, etc., it is preferable to arrange it vertically. That is, by using the apparatus as illustrated in FIG. 9, it is possible to simplify operations such as replenishing ink and replacing ink with another color.

When ink is replaced with a different color, the inking unit of the inking device is moved up and down.

When raising and lowering the inking unit, the ear-t-calling roller 10 and the inking roller 22 must always be in the same position in each unit.
Therefore, when the inking unit is raised or lowered, a means for controlling the height position is provided, for example, by a mechanical mechanism, an on-off switch (electrical), a detection sensor such as a light sensor, or a combination thereof. To enable each unit to always stop at a fixed position. The height position control means usually consists of two main body frames and each unit.

Ink is supplied from each unit of the inking device to the swinging roller 11 of the main body frame by attaching and detaching the ink feed roller 10 using an air cylinder or the like.

In the inking device 20 of the present invention, by forming an ink fountain with two ink mixing rollers 11 and 12, the number of rollers can be reduced and the inking device can have a simple configuration. Furthermore, since the ink fountain is formed between the two rotating rollers, the ink is stirred, and an agitator is not required, and the ink film is prevented from drying.

FIG. 3 is a side view of the inking device portion of the flatbed printing press of the present invention. In FIG. 3, the inking unit is raised to change to a different ink.

A state in which another unit is in contact with the ink drawing roller 10 and supplies ink to the swinging roller 11 on the main body frame 1 is shown.

FIG. 4 is a side view of the inking device of the flatbed printing press of the present invention, showing the ink and weir plate being pulled out toward the operation side when inserted between the two ink mixing rollers. It can also be pulled out for cleaning. By pulling out each unit toward the operating side, the work efficiency is greatly improved.

In other words, inserting ink or weir plates, or cleaning rollers,
Pulling out the unit makes one task very easy.

Furthermore, by providing each inking unit with a doctor 23 and a pallet 24, it is possible to significantly shorten the cleaning time.

Next, an example of printing using the flatbed printing press of the present invention will be described.

(1) Pull out each inking unit.

After inserting the weir plate and ink, return it to its original position.

(2) Constantly rotate each inking unit,
Select an arbitrary unit (usually ascends sequentially from the upper stage to the lower stage), and after the unit ascends or descends, the ink feed roller 10 comes into contact with the ink mixing roller 22, and then the main body frame 1 swings. Replenish or supply ink to the roller 11.

Next, an example of ink replenishment during printing will be shown.

(2-1) What is the amount of ink held by the swing roller 11 of the main body frame 1 and the ink roller 6 of the stand during printing?

Since the number of sheets decreases depending on the number of sheets printed, it is possible to set the ink feed roller 10 to reciprocate between the swinging roller 11 and the ink roller 6 for any predetermined number of sheets printed. For this reason, it is possible to avoid the phenomenon of print density reduction due to an increase in the number of printed sheets.
This makes it possible to print as many as 10,000 sheets.

(3) With the gantry 3 on the inking device 20 side (extraction), ink is supplied to the ink fountain between the ink mixing rollers 21 and 22, and the ink is supplied to the ink roller 6 via the ink calling roller 10. .

(4) Move the pedestal 4 to the dampening water device 2 side (precursor).

Dampening water is supplied to the water roller 5, which is usually a Molton roller, and the plate mounted on the second plate plate 7 is leveled by reciprocating the mount 3, and an appropriate amount of dampening water is applied to the first plate. supply

(5) Ink is supplied to the second plate by reciprocating the pedestal 3 including above the inking device 20.

(6) After an appropriate amount of ink is supplied to the plate, an ink image is formed on the blanket 4 by bringing the blanket 4 into contact with the plate.

The above (1) to (6) are the preparation stages. This preparatory work can of course be done manually or can be automated.

(7) Set the number of prints.

(8) Instruct to start printing. Normally, printing is started by pressing a print start button, and a set number of printed materials are obtained.

(9) Blanket 4 for the first printing after printing is completed.
．． The ink roller 6 and inking device 20 are cleaned.

Finally, we will show how to clean the inking unit.

(10) Apply (contact) the doctor 23 to the ink mixing roller using an air cylinder or the like to scrape off the ink on the ink mixing roller.

(11) Pull out each unit of the ink mixing roller to the operation side and clean the ink mixing roller and the like.

The inking device of the present invention can of course be used for monochrome printing.

It can also support multicolor printing. It is an inking device that can be attached to a conventional flatbed printing press and is also a replaceable inking device. Therefore, by installing the inking device of the present invention in a conventional flatbed printing machine, it is possible to improve multicolor printing.

``Effects of the Invention'' The present invention solves problems associated with ink supply, replenishment, and cleaning by performing ink supply, replenishment, and ink cleaning with a relatively simple device, resulting in quality In addition to being able to obtain stable printed matter,
This has shortened printing work time and reduced the number of work processes, and has also made it possible to significantly increase the number of sheets printed. To provide an inking device for a flatbed printing press capable of printing even without the use of a skilled person by greatly reducing the number of printing steps. SENO also provides a replaceable inking device that can be used with conventional flatbed printing presses.

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing a flatbed printing press according to the present invention, and FIGS. 2, 3, and 4 are side views illustrating an inking device portion of the present invention. The symbols in the figure are 1-main frame, 2-dampening water device, 3-
- pedestal, 4-blanket, 5-water roller. 6-ink roller, 7-plate surface plate, 8-paper surface plate, 9-sheet discharge tray, 11-ink feeding roller, 12-oscillating roller,
20 - inking device, 21. 22 - ink kneading roller, 23 - doctor, 24 - pallet. are shown respectively.

Claims (1)

[Claims] 1. A frame including an ink roller and a blanket cylinder,
In an inking device of a flatbed printing press that runs on a main body frame having an inking device on at least one end, two rollers that rotate in opposite directions to each other,
An inking device comprising a plurality of inking units each including a pair of ink mixing rollers with an ink fountain between the rollers. 2. The inking device 3 according to claim 1, in which ink can be supplied from another inking unit to the ink calling roller by vertically arranging a plurality of inking units and raising or lowering the inking units. , a means for determining the height position of the ink supply from the inking unit to the ink feed roller is provided in each inking unit and on the main body frame, and the height position of the ink supply is controlled. The inking device according to item 2. 4. The inking device according to claim 2 or 3, wherein each inking unit can be pulled out toward the operation side.