JPH1071701A - Ink chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform appropriate printing by sticking ink on a peripheral face under a pressure in some extent. SOLUTION: An ink pressure feeding path 17 through which ink reaches an apex edge side of a seal plate 7 and is delivered under pressurized condition is provided in an ink chamber 11. In addition, a spray hole 21 on the downstream side of the ink pressure feeding path 17 and along the apex edge of the seal plate 7 is closely arranged to a printing plate cylinder and ink sprayed on the printing plate cylinder from the spray hole 21 and scraped by means of a doctor blade 9 is discharged outside from the ink chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink chamber of a gravure printing machine.

[0002]

In recent years, in the inking of a gravure printing machine, a method has been proposed in which a part of a printing plate cylinder is immersed in the ink of an ink pan so that the ink adheres to the peripheral surface of the printing plate cylinder. Instead, for example, an ink chamber has been proposed in which an ink chamber closed to the outside can be formed by being attached to a printing plate cylinder. 2 to 6 show the ink chamber. The ink chamber 1 includes a chamber body 2 having a substantially C-shaped cross section formed of an aluminum member or the like. A partition member 4 made of a synthetic resin foam material is attached to both ends of the chamber body 2 by using an attachment plate 5 so as to face the groove 3 so as to face the groove 3 and to cover the sides of the groove 3. It is attached and fixed. The partition member 4 has a tapered shape toward the printing plate cylinder a, and the front end portion 6 thereof comes into sliding contact with the peripheral surface b of the printing plate cylinder a. A seal plate 7 made of a synthetic resin plate or the like is attached to the upstream side in the rotation direction of the printing plate cylinder a of the chamber body 2, that is, a lower portion of the chamber body 2 on the printing plate cylinder side. Of the printing plate cylinder a slides on the peripheral surface b of the printing plate cylinder a.
Further, a doctor blade 9 made of a mild steel material or the like is attached to the downstream side in the rotation direction of the printing plate cylinder a in the chamber main body 2 (upper part of the chamber main body 2 on the printing plate cylinder side). Partition member 4
Is in sliding contact with the peripheral surface b of the printing plate cylinder a. In this way, the groove 3 of the chamber body 2 is surrounded by the partition member 4, the seal plate 7, and the doctor blade 9, and the leading end of the groove 3 is brought into sliding contact with the peripheral surface b of the printing plate cylinder a. The ink chamber 11 is provided so that the ink is fed into the ink chamber 11 from an ink supply unit (not shown), and the ink adheres to the peripheral surface of the rotating printing plate cylinder a. The partition member 4 and the seal plate 7 prevent ink from leaking to the outside, and serve to scrape unnecessary ink from the peripheral surface b as well as the doctor blade 9. Both ends 12 of the seal plate 7 are in close contact with the lower surface 13 of the partition member 4, and both ends 14 of the doctor blade 9 are in close contact with the upper surface 15 of the partition member 4. In the drawing, reference numeral 2a denotes a holding plate for attaching the seal plate 7 to the lower slope of the chamber body 2, and 2b denotes a holding plate for attaching the doctor blade 9 to the upper slope of the chamber body 2.

In the ink chamber having the above structure, ink in the ink chamber adheres to the peripheral surface of the printing plate cylinder while the peripheral surface of the printing plate cylinder moves between the distal end edge of the seal plate and the distal end edge of the doctor blade. Excess ink is scraped off by the doctor blade, but the ink moves up from the leading edge of the seal plate toward the leading edge of the doctor blade along the circumferential surface by moving the circumferential surface in one direction. An upward flow A occurs in the ink chamber (see FIG. 5). When the ink comes into contact with the moving peripheral surface in this way, the ink adheres to the peripheral surface.However, the ink is not momentarily brought into contact with the peripheral surface, and the ink does not contact the peripheral surface. There was a problem that the adhesive force was small.

Accordingly, an object of the present invention is to increase the adhesion of ink while preventing the ink from leaking from the ink chamber to the outside, and an object of the present invention is to enable proper printing.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has a groove facing a peripheral surface of a printing plate cylinder on a side on which the printing plate cylinder moves upward, and is arranged so as to face the printing plate cylinder. Provided at each end of the chamber body is provided a partition member whose leading end is in sliding contact with the printing plate cylinder, and a seal plate is provided on the chamber body in the rotation direction upstream side of the printing plate cylinder, and the other partition member is provided from one partition member. A doctor blade that slides the leading edge of the seal plate over the partition member into contact with the printing plate cylinder and that is provided with a doctor blade downstream of the printing plate cylinder in the chamber body in the rotational direction, and that extends from one partition member to the other partition member. The leading edge of the blade is brought into sliding contact with the printing plate cylinder, and the ink chamber is formed by surrounding the groove of the chamber body with the partition member, the seal plate, and the doctor blade. In the ink chamber of the gravure printing machine and the chamber body to provide an ink chamber, characterized in that it comprises means for spraying ink on the circumferential surface of the printing plate cylinder, it is to solve the above problems. The means for spraying the ink is formed by forming an ink pressurized supply path in the ink chamber from the liquid supply port opened in the chamber main body to the front end side of the seal plate and in which the ink is fed in a pressurized state. A spray opening that opens along the leading edge of the seal plate and applies ink to the peripheral surface of the printing plate cylinder in the ink feeding direction downstream of the ink pressurizing supply path, and is disposed close to the printing plate cylinder; The drain port for discharging the ink, which has been applied to the printing plate cylinder and scraped off by the doctor blade from the ink chamber, to the outside can be opened in the chamber body. Further, the means for spraying the ink is such that an ink pressurizing supply path is formed in the ink chamber, where the ink reaches the leading edge side of the doctor plate from the liquid supply port opened in the chamber body and the ink is fed in a pressurized state. A spray opening that opens along the leading edge of the doctor blade and applies ink to the peripheral surface of the printing plate cylinder downstream of the ink pressurizing supply path in the ink feeding direction; The drain port for discharging the ink, which has been applied to the printing plate cylinder and scraped off by the doctor blade from the ink chamber, to the outside can be opened in the chamber body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment shown in FIG. 2 to 5 are denoted by the same reference numerals, and the description thereof will be omitted. In the figure, reference numeral 17 denotes an ink pressure supply path, and this supply path 17 is a vertical wall 1 of the chamber main body 2.
8 is formed from the liquid supply port 19 opened at the lower side of the ink chamber 11 to the leading edge 8 side of the seal plate 7 through the inner bottom of the ink chamber 11, and extends in the ink chamber 11 in the longitudinal direction. The ink pressure supply path 17 is defined inside the ink chamber 11 by providing a guide member 20 having a substantially C-shaped cross section and a seal plate-facing portion inclined upward toward the printing plate cylinder a. Then, the ink is fed into the ink pressurized supply path 17 from an ink supply source (not shown) in a pressurized state through the liquid supply port 19, and the fed ink adheres to the peripheral surface of the printing plate cylinder. Therefore, the outlet 21 on the downstream side in the ink supply direction in the ink pressure supply path 17 opens along the leading edge 8 of the seal plate 7 and is disposed close to the peripheral surface b of the printing plate cylinder a.

[0007] In the ink pressurizing supply path 17, as shown in the figure, a reservoir 22 is interposed in the vicinity of the liquid supply port 19, and the ink is widely spread along the seal plate 7 through the reservoir 22. The ink is sent to the opened outlet 21 (the reservoir is formed to be long in the width direction of the ink chamber). Then, as described above, the outlet 21 is disposed close to the peripheral surface b of the printing plate cylinder a, and the ink is further pressurized.
The ink sent out to the printing plate cylinder a through the ink pressure supply path 17 comes into contact with the peripheral surface b of the printing plate cylinder a with momentum, thereby improving the inking characteristic with respect to the printing plate cylinder. In addition, the reservoir has an effect of making the blowing pressure uniform in the width direction of the ink chamber in the width direction, thereby stabilizing the adhesion of the ink.

The ink sent from the outlet 21 flows upward along the peripheral surface b of the printing plate cylinder a which moves upward.
Then, the ink reaches the doctor blade 9, and unnecessary ink is scraped off by the doctor blade 9. As described above, the guide member 20 is inclined upward toward the printing plate cylinder a, receives the scraped ink without shifting to the ejection port 21 side, and is positioned higher than the guide member 20. It is provided so as to be discharged to the outside of the chamber main body 2 through a drain port 23 opened in the vertical wall portion 18. As described above, since the ink scraped off by the doctor blade 9 is received on the upper surface side of the guide member 20 and then discharged to the outside, when the ink collides with the guide member 20, it may foam. Also, the ink containing bubbles is provided so as not to be supplied to the printing plate cylinder a. In addition, since the ink is sent out by being regulated by the blow-off port, a large flow of ink does not occur in the entire ink chamber as in the related art, and the momentum of the ink flowing between the printing plate cylinder and the partition member is weak. And the ink does not leak to the outside during that time.

In the above-described embodiment, the ink pressure supply path is provided on the seal plate side. However, ink is supplied from the liquid supply port opened to the chamber body to the tip edge side of the doctor blade. The ink pressurized supply path fed in a pressurized state may be defined in the ink chamber, and the ink is opened along the leading edge of the doctor blade downstream of the ink pressurized supply path in the ink delivery direction. The spraying port for contacting the peripheral surface of the cylinder may be arranged close to the printing plate cylinder. That is, an ink pressure supply path may be provided on the side facing the above-described embodiment.

[0010]

The present invention is based on the configuration described above. As a result, the ink is sent from the outlet toward the peripheral surface of the printing plate cylinder, so that the adhesion of the ink to the peripheral surface of the printing plate cylinder is increased, and the inking characteristic of the ink chamber is improved. In addition, since the ink is sent out after being regulated by the blow-off port, a large flow of ink does not occur in the entire ink chamber as in the related art, and the flow of ink flowing between the printing plate cylinder and the partition member is weak. The ink does not leak to the outside from that time. Furthermore, since the ink scraped off by the doctor blade is separated from the ink sent to the peripheral surface of the printing plate cylinder and discharged to the outside of the ink chamber, ink containing air bubbles to the printing plate cylinder is prevented from adhering to the printing plate cylinder. In such a printing state, pinholes are not generated, and the effect excellent in practicality is exhibited.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of an ink chamber according to the present invention in a vertical section.

FIG. 2 is an explanatory view showing a conventional ink chamber.

FIG. 3 is an explanatory view showing a state where a side portion of a conventional ink chamber is disassembled.

FIG. 4 is an explanatory view showing a conventional example in a vertical section.

FIG. 5 is an explanatory diagram showing an ink chamber.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ink chamber 2 ... Chamber main body a ... Printing plate cylinder b ... Peripheral surface 7 ... Seal plate 9 ... Doctor blade 11 ... Ink chamber A ... Upflow 17 ... Ink pressure supply path 18 ... Vertical wall part 19 ... Liquid supply port Reference Signs List 20 guide member 21 outlet 22 reservoir 23 drainage outlet

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masaki Kono 1-5-1, Taito, Taito-ku, Tokyo Inside Toppan Printing Co., Ltd. (72) Inventor Takayuki Nakajima 1-15-1 Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd.

Claims (3)

[Claims] An end portion of a chamber main body which is arranged so as to face a printing plate cylinder with a groove portion facing a peripheral surface of the printing plate cylinder moving upward, and a tip end of the chamber body slides on the printing plate cylinder. Provide a partition member that contacts, a seal plate is provided in the chamber body on the upstream side in the rotation direction of the printing plate cylinder, and the leading edge of the seal plate extending from one partition member to the other partition member is slid on the printing plate cylinder, and A doctor blade is provided in the chamber main body on the downstream side in the rotation direction of the printing plate cylinder, and the leading edge of the doctor blade extending from one partition member to the other partition member is slidably contacted with the printing plate cylinder, and the groove of the chamber main body is formed. In an ink chamber of a gravure printing machine in which an ink chamber is formed by being surrounded by the partition member, the seal plate, and the doctor blade, An ink chamber, wherein the main body is provided with means for spraying ink on a peripheral surface of the printing plate cylinder; 2. The means for spraying ink comprises forming an ink pressurized supply path in the ink chamber from the liquid supply port opened in the chamber body to the leading edge side of the seal plate and into which ink is fed in a pressurized state. A spray port that opens along the leading edge of the seal plate and applies ink to the peripheral surface of the printing plate cylinder downstream of the ink feeding direction of the ink pressurizing supply path, is disposed in proximity to the printing plate cylinder, 2. A drain port for discharging ink, which has been applied to the printing plate cylinder from the spray port and scraped off by a doctor blade from the ink chamber to the outside, is opened in the chamber body.
2. The ink chamber of the gravure printing press according to 1. 3. The means for spraying the ink comprises forming an ink pressurized supply path in the ink chamber from the liquid supply port opened in the chamber main body to the leading edge side of the doctor blade to feed the ink in a pressurized state. A spray port that opens along the leading edge of the doctor blade and applies ink to the peripheral surface of the printing plate cylinder downstream of the ink feeding direction of the ink pressurization supply path, is disposed close to the printing plate cylinder, 2. A drain port for discharging ink, which has been applied to the printing plate cylinder from the spray port and scraped off by a doctor blade from the ink chamber to the outside, is opened in the chamber body.
2. The ink chamber of the gravure printing press according to 1.