JPH0535073B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to printing devices, and more particularly to an ink recirculating inking device for a rotary printing press that prints different colors of ink on a single plate cylinder. recycli
-ng inking system).

[Conventional technology]

In conventional printing techniques, a single rotating plate cylinder is intended to print only a single color of ink. In certain printing operations, such as newspaper printing, it may be desirable to deposit two or more different colors onto a single plate cylinder at different locations along the axial length of the cylinder. For this purpose, two or more doctor bars are associated with the inking roller and separated from each other so that inks of different colors can be deposited on the inking roller at desired locations, so that the inks of different colors do not become smeared or Mixing must be avoided.

German Patent Publication No. 1224327 discloses an ink fountain intended for use in a gravure printing press, which makes it possible to print inks of different colors simultaneously. It has a separation wall to The separating walls are spaced apart along the axis of the plate cylinder and are in sliding contact with the outer circumferential surface of the plate cylinder. However, this structure does not have an ink fountain with two doctor blades, and the part of the ink fountain adjacent to the separation wall and the high elastic sealing bar provided on the separation wall are integrated with a screw. connected, so that the separating wall cannot be moved relative to the adjacent doctor bar.

German Patent Application No. 31 35 711 shows an ink recirculation inking device with two doctor blades forming the walls of an ink chamber, but this inking device only deposits ink of a single color onto the inking roller. It is intended that

The ink deposition bar described in German Patent Application No. 33 20 638 together with two doctor blades forms an ink trough and is divided by an ink separator into sections for the various inks to be printed. This ink separator plate is guided in a guide hole of the ink deposition bar and is pressed against the screen cylinder by a leaf spring. However, when using quick-drying inks, the mobility of the ink separator plate is adversely affected by the ink drying within the guide holes.

[Problem to be solved by the invention]

It is an object of the present invention to provide an ink recirculation inking device capable of overcoming the above-mentioned drawbacks of the prior art, which allows printing inks of two or more different colors to be distributed at different locations along the axial length of a plate cylinder without mixing. The object of the present invention is to provide an ink recirculating ink device that can be attached to a single plate cylinder.

[Means to solve the problem]

Briefly, one feature of the present invention provides an ink recirculation inking device for a rotary printing press, comprising:
An inking unit for a rotary printing press is provided having an inking roller and an adjacent plate cylinder in surface contact with the inking roller. The inking device of the present invention is a support means supported by a printing press and extending in the axial direction of the ink roller, such that at least two doctor bars and an ink separation plate disposed between both doctor bars come into contact with the ink roller. and a support means for pivotally supporting them. The ink separator plate extends perpendicularly to the axis of the inking roller and is pivotally mounted on a pin having an axis oriented parallel to the axis of the inking roller. The pin is disposed above the center of gravity of the ink separator plate, and the axis of the pin is disposed between the axis of the ink roller and a perpendicular line passing through the center of gravity of the ink separator plate. The ink separator plate has a concave curved end surface, the concave curved end surface having the same radius of curvature as the ink roller. Further, the concave curved end surface is pressed by gravity and comes into sealing contact with the outer peripheral surface of the ink roller. Each doctor bar has an opposing end surface facing the ink separator plate. These opposing end faces are aligned with the end faces of the two doctor blades supported by each doctor bar and engage respective end faces of the ink separator plate. The doctor bar is mounted for axial displacement and is pressed into sealing contact with the adjacent side surface of the ink separator plate by suitable pressing means.

〔Example〕

Although the drawings, particularly FIGS. 1 and 2, only part of the flexo printing press is shown for clarity, it is understood that the printing press has a frame (not shown). sea bream. A pair of spaced apart support members 1, 2 extend from the frame of the printing press in opposing relationship, with each support member 1, 2
are provided with holes 1a and 2a, respectively. A cylindrical support bar 3 is arranged in these holes 1a, 2a, and the axis of the support bar 3 forms a pivot line. A pair of brackets 4, 5 each have a tubular body 4a, 5a, and the brackets 4, 5 are mounted in spaced apart relationship along the support bar 3. Bracket 4,5
each has a long extension 6, 7, which is provided with a long slot 8, 9, respectively. Slots 8 and 9 are aligned with each other;
and has a longitudinal axis along the length of each slot 8,9. The longitudinal axis of each slot 8,9 passes through an inking roller 17 (FIG. 2) whose axis is parallel to the axis of the support bar 3. Each tubular body 4a, 5a of the brackets 4, 5 clamps the brackets 4, 5 against the support bar 3 by means of clamping bolts (not shown).
5 has a longitudinal gap forming a split portion which allows it to be fixed in position along the support bar 3.

Slots 8, 9 slidably receive pins 10 which are passed through each of these slots. pin 10
is supported within the ink separator plate 11 and supports the ink separator plate 11 for pivoting about the axis of the pin 10. The pin 10 is attached to the ink separator plate 11 such that the axis of the pin 10 is offset from the center of gravity of the ink separator plate 11 and located between the center of gravity and the axis of rotation of the ink roller 17. The ink separator plate 11 has end faces 11a, 11b and is pivotable about the axis of the pin 10. Both brackets 4, 5 are spaced apart from each other by a sufficient distance to allow free pivoting of the ink separator plate 11 about the axis of the pin 10.

Respective extensions 6, 7 of brackets 4, 5
are interconnected by pins 12 passed through opposing holes provided in each of these extensions 6, 7, and are held so as not to rotate relative to each other. One end of a tension spring 13 is supported by the portion of the pin 12 extending into the space between the two brackets 4, 5, and the other end of the spring 13 is threaded into a support block 15 attached to the ink separator plate 11. It is supported by the matching end of the adjustment screw 14. The ink separation plate 11 is
It has a concave curved end surface 16 that can come into contact with the outer peripheral surface of the ink roller 17, and the radius of curvature of the end surface 16 and the radius of curvature of the ink roller 17 are equal.

The end surface 16 of the ink separation plate 11 is the ink roller 1
7, the ink separation plate 11 is in contact with the pin 10.
In order to be able to pivot about the axis of the ink separator plate 11, the ink separator plate 11 has a U-shaped opening 19;
The shaped opening 19 surrounds a part of the support bar 3 and is arranged at a distance from the support bar 3 when the end face 16 of the ink separation plate 11 engages the outer peripheral surface of the inking roller 17. Further, a bracket 20 for supporting a thin scraping bar 21 is provided at the lower part of the ink separating plate 11, and the front end of the scraping bar 21 is in contact with the outer peripheral surface of the ink roller 17.
The scraping bar 21 has a width in the axial direction of the ink roller 17 that is larger than the thickness of the ink separation plate 11 .

Figure 3 shows the ink separation plate 11 and the ink roller 1.
7 is an enlarged sectional view showing the end surface 16 of the ink separation plate 11 when the ink separation plate 11 is in contact with the outer circumferential surface of the ink separation plate 7. FIG. As shown in FIG. 3, a groove is formed in the end surface 16 of the ink separation plate 11, and the groove forms a knife edge 1 that can come into contact with the outer peripheral surface of the ink roller 17.
A pair of edge portions 16a are formed.

Returning to FIG. 1 again, a pair of tubular support members 22 and 23 are supported on the support bar 3, and the tubular support members 22 and 23 can be rotated and linearly moved ( translational movement). Each tubular support (tubular support member) 22, 23
are mounted adjacent to the brackets 4,5 on opposite sides of the brackets 4,5, respectively. The tubular supports 22 and 23 each have an outermost flange 22
a, 23a and a plurality of respective holders 24, 2
5, and the holders 24, 25 extend outward from the axes of the respective tubular members 22, 23. The holders 24, 25 support respective fountain doctor bars 26, 27. These doctor bars 26, 27 are long structures that extend in the axial direction of the ink roller 17 and have an overall rectangular cross-sectional shape as shown in FIG. An ink chamber 28 is formed on the side of the doctor bars 26, 27 facing the ink roller 17. Further, each ink doctor bar (ink fountain doctor bar) 26, 27 has an ink recirculation bore 29, 30, and the ink recirculation bore 29, 30 has an ink recirculation bore 29, 30.
9 and 30 communicate with the respective ink chambers 28. Furthermore, ink doctor bars 26, 27
are oppositely inclined doctor blades 3 forming part of the top and bottom walls of the ink chamber 28.
4, 35, the doctor blade 34,
The outermost edge of the ink roller 35 engages with the outer peripheral surface of the ink roller 17 . The doctor blades 34, 35 are arranged in respective intersecting planes parallel to the axis of rotation of the inking roller 17. Ink is supplied from an ink source (not shown) to the ink chamber 28, filling the ink chamber 28 and bringing the ink into contact with the ink roller 17. Excess ink is removed from the ink chamber 28 to the ink recirculation bore 3.
0,31 into the ink collection trough 33. As best shown in FIG. 1, the ink collection trough 33 is divided into two parts, e.g.
The partition wall member 32 is arranged along the axis of the ink roller 17 below the ink separating plate 11.

Referring again to FIG. 1, each tubular member 22,2
3 (and therefore the ink fountain doctor bar 26, 27)
The ink separator plate 1 is moved by compression springs 28' and 29' disposed between the support members 1 and 2 and the end flanges 22a and 23a of the tubular members 22 and 23, respectively.
It is pressed in the direction of 1. In addition, each tubular member 2
The axial lengths of the tubular members 22 and 23 are as follows: When the innermost ends of the ink fountain doctor bars 26 and 27 are in contact with the ink separating plate 11, and each bracket 4,5
A gap is formed between the outermost ends of the ink separator plate 11 such that the compression springs 28', 29' maintain the ink fountain doctor bars 26, 27 in close contact with the outer surface of the ink separator plate 11. It is determined by

The innermost end of each ink fountain doctor bar 26, 27 is the outer surface (end surface) 11a, 1 of the ink separating plate 11.
1b (ink separation plate 11
The outer surfaces 11a and 11b of the ink chamber 28 form one end wall of the ink chamber 28). The outermost end of each fountain doctor bar 26, 27 is closed by a splash guard (not shown) forming a closure for the outermost end of the ink chamber 28.

Each ink fountain doctor bar 26, 27
are pressed in the direction toward the axis of the ink roller 17 by a suitable pressing means, and the respective doctor blades 34, 35 and the outer circumferential surface of the ink roller 17 are maintained in close contact with each other. An example of such a pushing means is the air cylinder/pivoting arm structure shown and described in US Pat. No. 4,461,211, the disclosure of which is incorporated herein by reference. However, the end surface 16 of the ink separation plate 11 is maintained in contact with the outer peripheral surface of the ink roller 17 only by gravity.

In operation, the ink roller 17 is positioned in contacting relationship with the plate cylinder 18 and ink is supplied to the respective fountain doctor bar 26, 27.
Ink chamber 28 in the doctor bars 26, 27
(each ink chamber 28 contains ink of a different color). The ink separation plate 11 is brought into contact with the outer circumferential surface of the ink roller 17 such that a knife edge formed on the end surface 16 of the plate 11 comes into contact with the ink roller 17. Also, the pin 10 can pivot within the slots 8, 9 and
9, uniform contact pressure can be obtained over the entire surface of the end face 16. In this case, different contact pressures occur and the lowermost end of the end face 16 is kept in contact with the outer peripheral surface of the inking roller 17.
). In this embodiment of the invention, the provision of tension springs 13 and the ability of pins 10 to slide within slots 8 and 9 offset the contact pressure difference.
The initial tension of the spring 13 is adjusted so that the end face 16 contacts the inking roller 17 with uniform pressure over the entire length of its arc.

The scraping bar 21 attached to the lower part of the ink separation plate 11 prevents any residual ink from reaching the peripheral edge of the ink separation plate 11 by applying only a slight contact pressure to the outer peripheral surface of the ink roller 17. . Further, the length of the scraping bar 21 in the axial direction of the ink roller 17 is slightly larger than the width of the ink separating plate 11, and the scraping bar 21 is
1 and the outer circumferential surface of the inking roller 17 so as not to adversely affect the desired tight contact between the inking roller 17 and the outer peripheral surface of the inking roller 17.

Although specific embodiments of the invention have been illustrated and described, various changes may be made by those skilled in the art without departing from the spirit of the invention.
All such modifications are intended to be included within the scope of the invention as claimed.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of the inking device of the present invention, showing a state in which the ink separation plate is positioned so as to engage with the outer peripheral surface of the inking roller. FIG. 2 is an end view of the inking device partially cut away along line - in FIG. 1. FIG. 3 is an enlarged partial view taken along the - line in FIG. 1, showing the contact area between the ink separation plate and the ink roller. 1, 2... Support member, 3... Support bar, 4, 5
...Bracket, 6,7...Bracket extension, 8,9...Slot, 10...Pin, 11...
... Ink separation plate, 12 ... Pin, 13 ... Tension spring, 14 ... Adjustment screw, 15 ... Support block, 16 ... Concave curved end surface, 17 ... Ink roller, 18 ... Plate cylinder, 19 ... U-shaped opening, 20...
Bracket, 21...Scraping bar, 22, 23...
... Tubular support member, 24, 25 ... Holder, 26,
27... Ink fountain doctor bar, 28... Ink chamber, 29, 30, 31... Ink recirculation bore, 32... Partition member, 33... Ink collection trough, 34, 35... Doctor blade.

Claims (1)

[Scope of Claims] 1. In an inking device for a rotary printing press having an inking roller and an adjacent plate cylinder that makes surface contact with the inking roller, the inking device (a) is supported by the printing press and extends in the axial direction of the inking roller; support means for pivotally supporting at least two doctor bars and an ink separator plate; (b) said at least two elongated doctor bars having an inner end and an outer end; and rotatably and longitudinally movably supported by the support means in spaced end-to-end relationship, each doctor bar extending in a respective intersecting plane. each doctor blade is parallel to the axis of rotation of the inking roller and capable of surface engagement with the outer peripheral surface of the inking roller, and each doctor bar is formed between two respective doctor blades. and an ink chamber for receiving printing ink, each doctor bar having a planar innermost end surface and a closed outermost end forming a closed ink chamber between the doctor bar and the ink roller, (c ) the ink separating plate is disposed between the innermost end surfaces of the two doctor bars and extends substantially perpendicularly to the axis of the inking roller, and the ink separating plate supported by the supporting means supported on a pin received within the means and having an axis substantially parallel to the axis of the inking roller, the pin being above the center of gravity of the ink separator plate and passing through the axis of the inking roller and said center of gravity of the ink separator plate; It is located between the perpendicular line,
The ink separating plate has a concave curved end surface, the concave curved end surface has the same radius of curvature as the ink roller, and is in face-to-face contact with the ink roller, and the concave curved end surface is pressed by gravity and the ink roller An inking device characterized in that the ink chambers are in sealing contact with the outer circumferential surface of the ink chamber and separate the respective ink chambers supported within each doctor bar.