JPH1120138A - Ink feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a stabilized high quality color offset printing in which a print trouble, e.g. a spot or a streak, is eliminated from the print surface. SOLUTION: The ink feeder for offset printer comprises an ink source roller 5 to be fed with ink from an ink fountain 4, a doctor blade 7 provided for the ink source roller 5 in order to limit the quantity of ink being fed to the ink source roller 5, a roller 8 being delivered with ink from the ink source roller 5 and rotary driven at a circumferential speed different from that of the ink source roller 5, and a roller for feeding the delivered ink from the ink delivery roller 8 toward a plate cylinder 1. The ink delivery roller 8 is provided with means 14 for making smooth the irregular ink coating on the surface thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply device for feeding ink to a plate cylinder of an offset printing press.

[0002]

2. Description of the Related Art There are various types of ink supply devices for sending ink to a plate cylinder of an offset printing press. A continuous ink supply device using an ink fountain and a doctor blade has been mainly used at a higher speed than before. It is used for color printing of offset rotary presses, and recently for keyless offset rotary presses.

FIG. 5 shows an example of a continuous ink supply apparatus conventionally applied to a high-speed offset rotary press.
It has an ink key for adjusting the ink supply amount in the width direction. In this apparatus, both sides 1 of the ink fountain 100
01 abuts against the outer peripheral surface of the ink source roller 102 so that ink does not leak.
A doctor blade 103 that forms the inclined bottom surface of the ink fountain 100 is provided therebetween.

[0004] The doctor blade 103 is formed of a plurality of adjacent divided blades, and the leading end of each divided blade can individually adjust the gap between the divided blade and the ink source roller 102. The thickness of the ink film sent from the ink fountain 100 by rotation can be partially adjusted. The surface of an ink transfer roller 104 of this apparatus is drum-plated, and is mechanically driven at substantially the same peripheral speed as a plate cylinder 105 described later. The ink transfer roller 104 continuously receives ink from the ink supply roller 102 with a small gap C with respect to the ink supply roller 102 that is independently rotating at a low speed, and transfers the ink film to the ink transfer roller. Transfer to the next rubber roller 106 which rotates by pressing and contacting 104
Ink is sequentially sent out toward the plate cylinder 105.

FIG. 6 shows an example of a keyless type ink supply apparatus which has recently appeared in newspaper offset rotary presses, and the same parts as those in FIG. In this apparatus, ink is ejected to the ink source roller 102 via the ink supply nozzle 107. The ink jetted from the ink supply nozzle 107 to the surface of the ink source roller 102 is applied by a doctor blade 108 called an ink supply doctor. It is squeezed to a thicker film with a uniform thickness.
Then, the ink film comes into pressure contact with the ink source roller 102 and is transferred to the ink transfer roller 109 having a peripheral speed difference. The ink transfer roller 109 is
The surface is wrapped with rubber and roughened to improve ink acceptability. Ink base roller 102
Of the ink jetted onto the surface of the ink transfer roller 1
As a result, a thin uniform ink film is transferred to the ink transfer roller 109. The uniform film of ink transferred onto the ink transfer roller 109 is
The transfer to the next rubber roller 106 in pressure contact with the ink transfer roller 109 is performed.

In this apparatus, a doctor blade 110 called a hysteresis doctor is provided, and an ink scraping roller 111 called a doctor roller having a surface plated with copper is brought into pressure contact with the rubber roller 106. The doctor blade 110 for eliminating the history scrapes off the residual ink containing dampening water returning from the plate cylinder 105 to the doctor roller 111 through the roller 112 → the roller 113 → the roller 114 → the rubber roller 106.
From 06, a structure is adopted in which fresh coating ink is always received and supplied to the plate cylinder 105.

[0007] Fig. 7 shows another example of a keyless ink supply device in a newspaper offset rotary press. The same parts as those in Figs. 5 and 6 are denoted by the same reference numerals. In this apparatus, the ink source roller 102 rotates while being immersed in the ink in the ink fountain 115 and sends out the ink. The ink transfer roller 116 performs the same function as the anilox roller, and performs a special surface treatment coated with a resin containing ceramic on the surface so that a fixed amount of ink can be supplied.
2 has a minute gap. A doctor blade 117 is in contact with the ink delivery side of the ink transfer roller 116. The ink transferred from the ink supply roller 102 to the surface of the ink transfer roller 116 has excess ink scraped off by the doctor blade 117, so that a slight amount of the surface of the resin layer on the ink transfer roller 116 and the head of the particles are removed. The ink remaining in the gap forms an appropriate film, which is transferred to the next rubber roller 106 and supplied to the plate cylinder 105 via the rollers 118 and 119.

[0008]

However, the following problems are inherent in the ink supply device of the above-described conventional offset printing press. The ink source roller 102 and the ink transfer roller 104 shown in FIGS.
In the structure having a small gap C between the ink transfer rollers 104 and 116, the ink film transferred to the ink transfer rollers 104 and 116 becomes thicker, and the ink film has slightly irregularities. Since the transfer to the next roller 106 and the like occurs, printing defects such as spots and streaks appear on the stamp surface, and further improvement in quality of color printing cannot be expected. Further, the ink transfer roller 109 shown in FIG.
In the case of the structure which is in pressure contact with a peripheral speed difference with respect to 02, the ink film transferred onto the ink transfer roller 109 is thin and uniform, but requires a large power, and is cooled as a measure against heat generation. Was needed.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an ink supply apparatus capable of always performing stable and high-quality color printing without printing troubles such as spots and streaks on a stamp surface in offset printing. .

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an ink supply roller to which ink is supplied from an ink fountain, and an ink supply amount provided in the ink supply roller and supplied to the ink supply roller. A doctor blade, which transfers ink from the ink source roller, and which is driven to rotate with a difference in peripheral speed with respect to the ink source roller, and which receives the ink from the ink source roller. In an ink supply device in an offset printing press having a roller that supplies the ink toward the plate cylinder, an ink leveling unit for smoothing unevenness of an ink film on a surface of the ink transfer roller,
This is in addition to the ink transfer roller. Further, the present invention resides in that the ink leveling means is a rotatable roller having a width substantially equal to the width of the ink delivery roller and abutting on the ink delivery roller.
Furthermore, the present invention resides in that the ink leveling means is a plate member having a width substantially equal to the width of the ink transfer roller and abutting on the ink transfer roller.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a layout diagram showing a keyless type ink supply device in an offset rotary press according to a first embodiment of the present invention. In FIG. 1, a plate cylinder 1 of an offset rotary press transfers a plate to a blanket cylinder 2 and performs printing on a sheet supplied between the blanket cylinder 2 and the impression cylinder (not shown) by contact rotation. This plate cylinder 1 has
The pair of inking rollers 3, 3 is rotating while contacting, and ink is supplied from the inking rollers 3, 3 to the plate surface of the plate cylinder 1. These inking rollers 2 include:
Ink is transmitted through a group of rollers as described below.

The ink to be supplied to the plate cylinder 1 is contained in an ink fountain 4, and the ink in the ink fountain 4 is supplied to an ink source roller 5. This ink source roller 5
Has a surface plated with copper and is rotationally driven by a single variable speed motor (not shown). An ink supply nozzle 6 is provided adjacent to the ink supply roller 5.
The ink in the ink fountain 4 is ejected onto the surface of the ink fountain.

A doctor blade 7 is disposed adjacent to the ink source roller 5.
Is to limit the ink jetted to the surface of the ink source roller 5 to form an ink film having a uniform thickness. The doctor blade 7 can adjust the gap integrally with the ink source roller 5.

The ink delivery roller 8 to which ink is sent from the ink source roller 5 is provided with an ink source roller 5.
The ink transfer roller 8 is rotationally driven at substantially the same peripheral speed as the plate cylinder 1. The surface of the ink transfer roller 8 is copper-plated and roughened to improve ink acceptability. The ink transfer roller 8 is
The surface is not limited to copper plating, and may be formed by continuous fine grooves formed by rubber winding to improve ink acceptability and form a minute gap C with respect to the ink source roller 5. .

The ink of the ink transfer roller 8 is
The ink is transferred to the next rubber roller 9 which is in pressure contact with the ink transfer roller 8, and the ink of the rubber roller 9 is supplied to the ink forming rollers 3 and 3 via the rollers 10 and 11. The rubber roller 9 includes a roller 10
In addition, a doctor roller 12 for scraping ink, the surface of which is plated with copper, is in contact with the doctor roller 12. The doctor roller 12 is driven by a gear (not shown) and rotates while reciprocating in the axial direction. . A doctor blade 13 is in contact with the doctor roller 12, and the doctor blade 13 scrapes off residual ink containing dampening water returning from the plate cylinder 1 onto the doctor roller 12.

The ink supply device of the present invention is applied to the ink supply device of the keyless offset rotary press configured as described above. The ink supply roller 8 extends in the width direction (axial direction) of the ink delivery roller 8. It is provided with an ink leveling means for smoothing the unevenness of the ink film above. The ink leveling means is a rotatable contact roller (roller) 14 which comes into contact with the entire width of the ink transfer roller 8 on the ink return side. The surface of the contact roller 14 is not limited to metal and may be coated with a resin or the like. Furthermore, this contact roller 1
4 may be provided with a contact roller 14 'on the ink delivery side of the ink transfer roller 8, as indicated by a two-dot chain line in FIG.

The operation of the above configuration will be described. When the operation of the rotary press is started and the ink circulation pump is started, fresh ink in the ink fountain 4 is jetted from the ink supply nozzle 6 to the surface of the ink source roller 5. The ink adhering to the ink source roller 5 is restricted by the doctor blade 7 by the rotation of the ink source roller 5, and an ink film having a uniform thickness is formed. The ink in the form of a film sent from the ink supply roller 5 passes through the minute gap C between the ink supply roller 5 and the ink transfer roller 8 and is supplied to the ink transfer roller 8 rotating at a higher peripheral speed than the ink supply roller 5. It is delivered as an appropriate ink film on the surface. Therefore, when it is necessary to adjust the paper surface density for each plate cylinder, the ink source roller 5
Can be easily adjusted by adjusting the rotation speed of the doctor blade or by changing the gap between the doctor blade 7 and the ink source roller 5.

Since the contact roller 14 (or the contact roller 14 ') is pressed against the ink transfer roller 8, the unevenness of the ink is eliminated and smoothed by the leveling effect. A uniform ink film without irregularities is formed. This uniform ink film is transferred from the ink transfer roller 8 to the rubber roller 9 and is sequentially supplied to the plate cylinder 1 via the next rollers 10 and 11 and the ink applying rollers 3 and 3. At this time, if the contact roller 14 (or the contact roller 14 ′) is not provided on the ink transfer roller 8, the ink film transferred onto the ink transfer roller 8 is generated on the return side surface of the ink transfer roller 8. The threading phenomenon that occurs when the ink is transferred from the ink source roller 5 overlaps the spotted ink riding unevenness that has occurred, causing unevenness.

In this apparatus, since the doctor blade 13 for hysteresis scrapes the residual ink containing dampening water returning from the plate cylinder 1 to the doctor roller 12, fresh ink is always obtained from the rubber roller 9. The coating ink is received and supplied to the plate cylinder 1.

In this embodiment, the ink film sent from the ink transfer roller 8 is applied to the contact roller 14 (or the contact roller 1) as an ink leveling means.
4 '), a uniform ink film having no unevenness is formed, and the uniform ink film is sequentially transferred to the next rubber roller 9 or the like. It is possible to perform stable and high-quality color printing without any problem. A minute gap C is provided between the ink source roller 5 and the ink transfer roller 8 and the contact roller 14 (or the contact roller 14 ') is brought into contact with the ink transfer roller 8 so that stable high-quality color printing can be performed. This eliminates the need for larger power than before, and also eliminates the need for cooling measures. The contact roller 14 (or the contact roller 1) whose ink leveling means is rotatable.
4 '), the linear accuracy is good, and the surface of the ink transfer roller 8 is uniformly contacted. Therefore, the function of smoothing the unevenness of the ink film on the ink transfer roller 8 is great.

FIG. 2 shows a second embodiment of the present invention.
The same parts as those described above are denoted by the same reference numerals, and description thereof will be omitted. In this case, a contact plate (plate member) 15 is provided as ink leveling means provided in the width direction of the ink transfer roller 8. The contact plate 15 has a width substantially equal to the width of the ink transfer roller 8 and uniformly contacts the ink return roller 8 on the ink return side. The backing plate 15 is not limited to metal, but may be a surface having a surface coated with resin or the like. The mounting position of the contact plate 15 may be provided on the ink delivery side of the ink transfer roller 8 as indicated by the two-dot chain line in FIG. In the second embodiment, the ink film sent out from the ink transfer roller 8 is smoothed by a reliance plate 15 (or reliance plate 15 ') as an ink leveling means, and a uniform ink film without irregularities is provided. Is formed, and the uniform ink film is sequentially transferred to the next rubber roller 9 or the like, so that it is possible to always perform stable and high-quality color printing without printing obstructions such as spots or streaks on the stamp surface. Ink source roller 5 and ink transfer roller 8
By providing a small gap C between the rollers and bringing the contact plate 15 (or the contact plate 15 ') into contact with the ink transfer roller 8, stable high-quality color printing can be performed. It is no longer necessary, and no cooling measures are required. Ink leveling means is a patch plate 15
Since it is of the (or backing plate 15 ') type, the linear accuracy is good and the surface of the ink transfer roller 8 is evenly contacted, so that the function of smoothing the unevenness of the ink film on the ink transfer roller 8 is great. In addition, since the backing plate 15 (or backing plate 15 ') is a non-rotating type, there is an advantage that ink does not scatter even during high-speed operation.

FIG. 3 is a layout diagram showing a third embodiment in which the present invention is applied to a continuous ink supply device applied to the high-speed offset rotary press described with reference to FIG. In this apparatus, the ink source roller 16 is configured such that the arc portions 18a formed on the end surfaces of the both side surfaces 18 of the ink fountain 17 contact the outer peripheral surface so that the ink does not leak to both sides. A doctor blade 19 that forms the inclined bottom surface of the ink fountain 16 is provided between both side surfaces 18 of the ink fountain 17, and ink is supplied to the ink source roller 16 along the inclined surface of the doctor blade 19. You.

The doctor blade 19 is formed of a plurality of divided blades that are in contact with each other, and the tip of each divided blade is configured so that the gap between the blade and the ink source roller 16 can be individually adjusted. The doctor blade 19 can partially adjust the thickness of the ink film sent from the ink fountain 17 by the rotation of the ink source roller 16. The surface of an ink transfer roller 20 of this apparatus is drum-plated, and is mechanically driven at substantially the same peripheral speed as the plate cylinder 21. The ink transfer roller 20 continuously receives ink from the ink supply roller 16 with a small gap C with respect to the ink supply roller 16 which is independently rotating at a low speed, and transfers the ink film to the ink transfer roller. 20 and transferred to the next rubber roller 22 which rotates by pressing
Ink is sequentially sent out to the plate cylinder 21 via the roller group 23.

A rotatable contact roller 24 as ink leveling means of the present invention is disposed on the ink return side in the width direction of the ink transfer roller 20.
The material of the contact roller 24 and others are the same as the structure described in the first embodiment. The installation position of the contact roller 24 is indicated by a two-dot chain line in FIG.
4 ', it may be provided on the ink delivery side of the ink transfer roller 20. In the third embodiment,
The ink film sent out from the ink transfer roller 20 is smoothed by a contact roller 24 (or a contact roller 24 ') as an ink leveling means, and a uniform ink film without unevenness is formed. Since the ink film is successively transferred to the next rubber roller 22 or the like, it is possible to always perform stable high-quality color printing without printing obstruction such as spots or streaks on the stamp surface. By providing a minute gap C between the ink source roller 16 and the ink transfer roller 20 and bringing the contact roller 24 (or the contact roller 24 ') into contact with the ink transfer roller 20, stable high-quality color printing can be performed. This eliminates the need for larger power than before, and also eliminates the need for cooling measures. Since the ink leveling means is of a rotatable contact roller 24 (or contact roller 24 ') type, linear accuracy is good, and the ink contact roller uniformly contacts the surface of the ink transfer roller 20. The function of smoothing the irregularities is great.

FIG. 4 shows a fourth embodiment of the present invention.
The same parts as those described above are denoted by the same reference numerals and description thereof is omitted.
In this case, a contact plate 25 is provided in the width direction of the ink transfer roller 20 as the ink leveling means of the present invention. The backing plate 25 is the same as the backing plate 15 described in the second embodiment in the material and the like. The mounting position of the backing plate 25 may be provided on the ink delivery side of the ink transfer roller 8 as shown by the two-dot chain line in FIG. In the fourth embodiment, the ink film sent out from the ink transfer roller 20 is applied to a backing plate 25 as an ink leveling means.
(Or a backing plate 25 ') to form a uniform ink film without any irregularities. The uniform ink film is sequentially transferred to the next rubber roller 22 or the like. It is possible to always perform stable high-quality color printing without printing troubles such as printing. By providing a small gap C between the ink source roller 16 and the ink transfer roller 20 and bringing the contact plate 25 (or the contact plate 25 ') into contact with the ink transfer roller 20, stable high-quality color printing can be performed. This eliminates the need for larger power than before, and also eliminates the need for cooling measures. Since the ink leveling means is of the rotatable backing plate 25 (or backing plate 25 ') type, the linearity is good and the ink is uniformly contacted with the surface of the ink transfer roller 20, so that there is no threading. The function of smoothing the unevenness of the ink film on the roller 20 is great.

[0027]

As described above, according to the ink supply device of the present invention, the following effects can be obtained. 2. The ink supply roller according to claim 1, wherein the ink supply roller supplies ink from the ink fountain, a doctor blade provided on the ink supply roller to limit an ink supply amount supplied to the ink supply roller, and ink supplied from the ink supply roller. An ink delivery roller that is delivered and is rotationally driven with a peripheral speed difference with respect to the ink source roller; and a roller that supplies the ink delivered to the ink delivery roller toward the plate cylinder. In the ink supply device of the offset printing press, the ink leveling means for smoothing the unevenness of the ink film on the surface of the ink transfer roller is provided alongside the ink transfer roller, so that the ink delivered from the ink transfer roller is provided. The film is smoothed by the ink leveling means, and a uniform ink film without unevenness is obtained. Made is, the uniform ink film sequentially, since going to transition to the next roller or the like, can be performed constantly stable and high-quality color printing without printing trouble such as spots or streaks on the stamp surface. Therefore, a larger power is not required as compared with the related art, and no cooling measures are required. In claim 2, since the ink leveling means is a rotatable roller having a width substantially equal to the width of the ink delivery roller and abutting on the ink delivery roller, the linearity accuracy is good, and Since it comes into uniform contact with the surface, the function of smoothing the unevenness of the ink film on the ink transfer roller is great. In Claim 3, since the ink leveling means is a plate member having a width substantially equal to the width of the ink transfer roller and abutting against the ink transfer roller, the linearity accuracy is good, and Since the contact is uniform, the function of smoothing the unevenness of the ink film on the ink transfer roller is great. In addition, since the plate member is a non-rotating type, there is an advantage that ink does not scatter even during high-speed operation.

[Brief description of the drawings]

FIG. 1 is a layout diagram showing a first embodiment of an ink supply device of the present invention.

FIG. 2 is an arrangement view showing a second embodiment of the ink supply device of the present invention.

FIG. 3 is a layout diagram showing a third embodiment of the ink supply device of the present invention.

FIG. 4 is an arrangement diagram showing a fourth embodiment of the ink supply device of the present invention.

FIG. 5 is a layout diagram showing a continuous ink supply device applied to a conventional high-speed offset rotary press.

FIG. 6 is a layout diagram showing a keyless ink supply device used in a conventional newspaper offset rotary press.

FIG. 7 is a layout diagram showing a keyless ink supply device used in a conventional newspaper offset rotary press.

[Description of Signs] 1,21 Plate cylinder of offset rotary press 2 Blanket cylinder 3 Ink roller 4,17 Ink fountain 5,16 Ink source roller 6 Ink supply nozzle 7 Doctor blade 8,20 Ink transfer roller 9,22 Rubber roller 12 Doctor roller 13 Doctor blade 14, 14 ', 24, 24' Roller (ink leveling means) 15, 15 ', 25, 25' Roller (ink leveling means) 16 Ink source roller 17 Ink fountain

Claims (3)

[Claims] An ink supply roller for supplying ink from an ink fountain, a doctor blade provided on the ink supply roller for limiting an amount of ink supplied to the ink supply roller, and an ink supply roller for supplying ink from the ink supply roller. An ink delivery roller that is delivered and is rotationally driven with a peripheral speed difference with respect to the ink source roller; and a roller that supplies the ink delivered to the ink delivery roller toward the plate cylinder. An ink supply device for an offset printing press, wherein an ink leveling means for smoothing unevenness of an ink film on a surface of the ink delivery roller is provided in addition to the ink delivery roller. 2. The ink leveling device according to claim 1, wherein the ink leveling means is a rotatable roller having a width substantially equal to the width of the ink delivery roller and abutting on the ink delivery roller. Ink supply device. 3. The ink supply according to claim 1, wherein the ink leveling means is a plate member having a width substantially equal to the width of the ink transfer roller and abutting on the ink transfer roller. apparatus.