JP4402995B2 - Ink device for rotary printing press - Google Patents

Description

  The present invention relates to an inking device for a rotary printing press.

  A conventional inking device that supplies ink to a plate mounted on a plate cylinder in a rotary printing machine, etc., supports an ink fountain for storing ink and an ink in the ink fountain, and is supported under the bottom plate of the fountain. A plurality of roller groups arranged between the roller and the plate cylinder, and the roller group and the roller group so as to come into contact with the roller group. A swing roller disposed between the roller and movable in the axial direction; and a transfer roller disposed between the roller and the swing roller so as to be capable of reciprocating between the roller and the swing roller. It has become.

  In such an inking device, the ink drawn from between the bottom plate of the ink fountain as the fountain roller rotates is received by the transfer roller and transferred to the swing roller, so that the ink from the fountain roller having a relatively low peripheral speed can be obtained. The ink can be supplied to a swinging roller having a relatively high peripheral speed, and the necessary amount of ink can be supplied to the plate on the plate cylinder via a roller group (for example, Patent Document 1 below) reference).

  However, in such an inking device of a rotary printing press, a shock is given to the reed roller and the swing roller when contacting the reed roller and the swing roller of the transfer roller, which may adversely affect the print quality. There is.

  For this reason, as shown in FIG. 4, by using a transfer roller 113 positioned so as to have a predetermined gap t between the reed roller 112 and using the film thickness of the ink 100 drawn by the reed roller 112. An inking device is used in which the ink 100 in the ink fountain 111 can be supplied from the fountain roller 112 having a relatively slow peripheral speed to the kneading roller 114 having a relatively fast peripheral speed by a predetermined amount without causing the transfer roller 113 to reciprocate. (See, for example, Patent Document 2 below).

JP-A 56-120352 JP-A-11-138762

  In the conventional inking device described in Patent Document 2 and the like as described above, when high speed operation is performed, heat is generated due to stirring or shearing of the ink 100 or an increase in partial pressure when passing through the gap t. The transfer roller 113 is heated. At this time, as shown in FIG. 5A, the transfer roller 113 has a slight deflection amount s in the radial direction in terms of manufacturing accuracy, and accordingly, in the circumferential direction according to the deflection amount s. As a result, a temperature difference is generated and the radially outer side rises more temperature than the radially inner side, resulting in a difference in thermal expansion in the axial direction, as shown in FIGS. 5B and 5C. Will be curved. For this reason, the reed roller 112 and the transfer roller 113 have a gap t1 that is smaller than the gap t at the central portion in the axial direction, and the amount of ink supplied from the central portion in the axial direction increases, and the central portion in the width direction of the printed matter There was a problem that the concentration of sucrose increased.

  In view of the above, an object of the present invention is to provide an inking device for a rotary printing press that can suppress the bending of a transfer roller even during high-speed operation.

  In order to solve the above-described problems, an inking device of a rotary printing press according to the present invention is in contact with an ink fountain for storing ink and the ink in the ink fountain, and the gap is formed between the ink fountain bottom plate and the ink fountain plate. A reed roller that draws out ink, a reversible transfer roller that is disposed adjacent to the reed roller with a gap, receives the ink from the reed roller, and is adjacent to the transfer roller. In an inking device of a rotary printing press provided with a kneading roller for receiving the ink from a roller, the substrate of the transfer roller is made of carbon fiber reinforced plastic or ceramics.

In the above-described inking device of a rotary printing press, the surface layer of the transfer roller is made of 11-polyamide, 12-polyamide or copper.

  According to the inking device of the rotary printing press according to the present invention, since the bending of the transfer roller can be suppressed even during high-speed operation, the amount of ink to be supplied can be suppressed uniformly and the density of printed matter is increased. Can be prevented.

  An embodiment of an inking device of a rotary printing press according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram of an inking device, and FIG. 2 is a partially extracted enlarged view of a transfer roller of the inking device of FIG.

In FIG. 1, 10 is an inking device, 20 is a plate cylinder, and 30 is a rubber cylinder.
Reference numeral 11 denotes an ink fountain that can store the ink 100. A reed roller 12 contacts the ink 100 in the ink fountain 11 and draws out the ink 100 from a gap with a plurality of unillustrated reed keys supported below the bottom plate 11 a of the ink fountain 11. Can be done.

  Reference numeral 13 denotes a transfer roller, which is disposed close to the heel roller 12 so as to have a predetermined gap t with the heel roller 12. As shown in FIG. 2, the transfer roller 13 is much more than the linear expansion coefficient (about 11.7 × 10 −6) of steel such as carbon fiber reinforced plastic (CFRP) or ceramics. Rilsan (trade names of 11-polyamide and 12-polyamide from Atofina Japan Co., Ltd.) on the outer peripheral surface of a cylindrical substrate 13a made of a material having a small linear expansion coefficient (about −0.2 × 10 −6 in CFRP) The surface layer 13b made of a material having excellent ink transfer properties such as copper or copper is provided with a minimum thickness (thickness that is thin enough not to affect the thermal expansion in the axial direction).

  Reference numeral 14 denotes a kneading roller, which can rotate in contact with the transfer roller 13. A roller group 15 is disposed between the kneading roller 14 and the plate cylinder 20 so that the ink 100 can be received from the kneading roller 14 and supplied to the plate cylinder 20.

  In such an ink apparatus, heat is generated due to stirring or shearing of the ink 100 or an increase in partial pressure when the ink passes through the gap t, and the transfer roller 13 is heated in accordance with the conventional technique. As described above, even if a temperature difference occurs in the circumferential direction, the transfer roller 13 is composed of the base body 13a made of carbon fiber reinforced plastic or ceramic having a small linear expansion coefficient. There is no such thing as doing it. Further, since the surface layer 13b made of rilsan or copper is provided on the outer peripheral surface of the base body 13a with the minimum necessary thickness, high ink transferability is exhibited.

  Therefore, according to the present embodiment, the amount of change in the gap between the reed roller 12 and the transfer roller 13 can be suppressed to a negligible level, so that the amount of ink to be supplied can be suppressed uniformly, and the density of the printed matter increases. Can be prevented.

  Here, in order to confirm the effect of the ink device of the rotary printing press according to the present invention, the ink supply time and the ink film thickness between the case where the ink device according to the present invention is used and the case where the conventional ink device is used are I investigated the relationship. The result is shown in FIG. The ink film thickness was measured on the most upstream roller 15a of the roller group 15 in FIG.

  As is apparent from FIG. 3, in the conventional inking device, as the ink is supplied, the thickness of the supplied ink gradually increases, but in the inking device according to the present invention, the ink Even when the supply was performed, there was almost no change in the film thickness of the supplied ink. Therefore, it was confirmed that the present invention can suppress the bending of the transfer roller.

  The inking device of the rotary printing press according to the present invention can suppress the bending of the transfer roller even during high-speed operation, and can suppress the increase in the density of the printed matter by uniformly suppressing the amount of ink to be supplied. Therefore, it can be used extremely beneficially in the printing industry.

It is a schematic block diagram of embodiment of the ink apparatus of the rotary printing press which concerns on this invention. FIG. 2 is a partially extracted enlarged view of a transfer roller of the inking device of FIG. 1. It is a graph showing the relationship between the case where the ink apparatus which concerns on this invention is used, and the case where the conventional ink apparatus is used, and ink film thickness. It is a schematic block diagram of an example of the conventional ink apparatus of a rotary printing press. FIG. 5 is a problem explanatory diagram of the inking device of FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inking machine 11 Ink fountain 11a Bottom plate 12 壺 Roller 13 Transfer roller 13a Base body 13b Surface layer 14 Kneading roller 15 Roller group 20 Plate cylinder 30 Rubber cylinder 100 Ink

Claims (2)

An ink fountain for storing ink;
A fountain roller that contacts the ink in the ink fountain and draws out the ink from a gap with the bottom plate of the ink fountain;
A rotatable transfer roller disposed so as to be close to the reed roller and receiving the ink from the reed roller;
In an inking device of a rotary printing press provided with a kneading roller adjacent to the transfer roller and receiving the ink from the transfer roller,
An inking device for a rotary printing press, wherein the substrate of the transfer roller is made of carbon fiber reinforced plastic or ceramics. In claim 1,
An inking device for a rotary printing machine, wherein the surface layer of the transfer roller is made of 11-polyamide, 12-polyamide or copper.

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