JPS61108558A - Ink recirculating inking system consisting of split ink ductdoctor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an ink recirculation inking system for a rotary printing press, preferably a flexographic printing press.
This system consists of a doctor bar and two doctor blades, the doctor blade is supported by the doctor bar and can move in mesh with the ink roller, and the doctor bar is arranged between the two doctor blades to supply ink and It has a dispersion groove and also has means for supplying ink to and removing ink from the groove.

PRIOR ART Such an ink recirculation inking system is known from DE 31 35 711. This known ink recirculation system serves to supply only one color of ink to the ink roller. In certain printing operations, for example in newspaper printing, it is desirable to supply inks of two or more different colors to respective portions of the axial length of the plate cylinder. For this purpose, it is necessary to connect two or more doctor bars to the ink roller, and ink of different colors can be supplied to the desired part of the ink roller, and smearing of ink of different colors, Alternatively, it is necessary to keep the doctor bars separated from each other by ink separators extending in the radial plane of the ink roller, so that the risk of mixing is avoided. The parts of the ink roller to which different colors of ink are applied are separated only by a thin annular band, which prevents ink from getting onto the roller.

West German Patent Publication No. 1224327 discloses an ink reservoir intended for use in rotogravure printing machines, which is spaced along a plate cylinder and whose It has a separator wall in sliding contact with the surroundings. This known ink fountain has two parts adapted to press against an ink roller.
Two doctor blades are not provided, and a separation wall and
The highly elastic sealing bar provided on the separation wall and the part of the ink reservoir connected to the separation wall are integrated by screw means so that the separation wall cannot move relative to the doctor bar to which it is connected. They are combined as follows.

West German Patent Publication No. 33 20 638, which is not an earlier publication, defines a trough with two doctor blades,
An ink supply bar is disclosed which is divided into sections for different inks to be printed by an ink separator plate. The ink separation plate is guided into the gap between the ink supply bars,
It is pushed towards the sieve cylinder by a false spring. Especially when using quick-drying ink, the mobility of the ink separation plate is
It is adversely affected by ink drying in the guide gap.

OBJECTS OF THE INVENTION It is an object of the invention to provide an ink recirculating ink of the type first mentioned herein consisting of at least two doctor bars separated from each other by an ink separator extending between their opposite end faces. The present invention is to provide a coating system in which there are no troubles for drying the ink and no restrictions on the freedom of movement of the ink separator.

This purpose is to have at least two doctor bars, and an ink separation plate is placed between the two doctor bars, extending at right angles to the axis of the ink roller and parallel to the ink roller. It is pivoted on a pin which is placed on the center of gravity of the ink separator plate and between the ink roller and a vertical line extending through the center of gravity, and the ink separator plate has the same diameter as the ink roller. the ink separator plate has a capped distal end surface facing it and extending circumferentially over the doctor blade, the distal end surface of the ink separator plate being tilted by gravity and in sealing contact with the outer circumferential surface of the ink roller; the doctor bar has a distal plane facing the ink separator plate and aligned with the distal face of the doctor blade;
It is achieved according to the invention that the doctor bar is axially exchangeably mounted and is adapted to come into sealing contact with adjacent sides of said in-1 well-separated plate.

In accordance with the present invention, in the operation of the ink recirculating inking system, the width of the uninked strip is approximately the thickness of the ink separator plate. The ink separator plate is supported by a pin on a pivot and guided only by the end face of the doctor bar, so that there is no risk of ink sticking or smearing, as there is no special guidance that can be disturbed by drying ink. has been done.

If the pin on which the ink separator plate is pivoted extends through a groove made in the separator plate and extends towards the ink roller, the terminal face of the ink separator plate and the outer peripheral surface of the ink roller A particularly effective sealing contact between the ink separator plates and the ink rollers is achieved, with the ink separator plate tilted towards the ink roller by means of a spring that engages with the separator plate on its center of gravity.

The ink separator plate is not only rotatable in vivo, but also capable of translational movement towards the ink roller, such that the suitably contoured end face of the plate is sealed and in contact with the outer peripheral surface of the ink roller. However, the movement of the ink separator plate in the radial plane of the ink roller will not be restricted by this mounting.

The ink separator plate is preferably made with grooves on its terminal face, the grooves being defined by side walls having terminal edges consisting of knife edges.

In a preferred embodiment, a scraping bar parallel to the axis of the ink roller is provided adjacent to the lower side edge of the ink separator plate, the scraping bar having a length that exceeds the width of the ink separator plate.

The length of the scraping bar is only slightly longer than the width of the ink separator plate. The scraping bar scrapes any residual ink from the ink roller so that it does not reach the ink separator plate and contaminate it. The scraping bar has sufficient flexibility so as not to adversely affect the sliding contact between the ink separator plate and the outer peripheral surface of the ink roller.

The doctor bar and ink separator plate are held by a clamping device that is pivoted on a common pivot. Each clamp has an extension to which an ink separator plate is attached. It engages with the top of the ink separation plate,
The spring pushing the ink separator plate towards the ink roller consists of a tension spring, which is fixed at one end to the ink separator plate and to the clamping device at the other end.

The doctor bar is potted to the pivot by bushing means and moved towards the ink separator plate by means of a compression spring surrounding the pivot and pressing against a stop fixed to the frame of the machine.

! DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Illustrated embodiments of the present invention will be described in detail with reference to the drawings.

Pivot 3 consists of two plaques fixed to the side wall (not shown) of a flexo printing machine for printing newspapers).
1.It is installed within 2. Two identical brackets 4.5, arranged in mirror symmetry, are fixed to the pivot 3 and have extensions 6.7, each of which has a groove 8.
9 is formed. The pin 10 extends through both grooves 8.9. The ink separation plate 11 is supported by a pivot from the pin 10. The two extensions 6.7 are connected to each other and are held against rotation by a further pin 12, which pin is attached to one end of the tension spring 13 in the free space between the extensions 6 and 7. I'm surrounded. The other end of the spring 13 is fixed to an adjacent screw 14 which is connected through a prong 15 which is fixed to the ink separator plate 11. The two brackets 4.5 are fixed to the pivot 3 and are spaced apart at such a distance that they do not impede the movement of the ink separator plate 11 around the pin 10.

The tension spring 13 pushes the end face 16 of the ink separator plate 11 towards the ink roller 17, which transfers the ink to the temporary cylinder 18. The pin 10 is attached so that the axis of the pin 10 is separated from the center of gravity of the ink separation plate 11 toward the ink roller 17.

In order for the ink separator plate 11 to be pivotable about the pin 10, the ink separator plate 11 is made with an opening 19 adjacent to the pivot 3.

There is a bracket 20 at the bottom of the ink separation plate 11 that supports the scraping bar 21, and the width of the bracket 20 is the same as that of the ink separation plate 11.
The thickness exceeds 1. The shape of the ink separator plate 11 adjacent to its end face 16 in contact with the ink roller 17 is evident from FIG.

As is clear from FIG. 2, two tubular members 22 and 23
are adjacent to and facing brackets 4 and 5, respectively,
It is attached to pivot 3.

Tubular members 22 and 23 are connected to holders 24 and 25, respectively. The holder 24 supports an ink duct doctor bar 26, and the holder 25 supports an ink duct doctor bar 27. Adjacent ends of the two ink duct doctor bars 26 and 27 are open and in sealing contact with opposite sides of the ink separator plate 11. The ink separator plate is coated with an ink-repelling coating, for example made of polytetrafluoroethane.

The two ink duct doctor bars 26 and 27 are tilted by compression springs 28' and 29'. One end of this spring presses against the brackets 1 and 2, and the other end presses against the opposite end faces of the tubular members 22 and 23. The spacing between the two tubular members 22 and 23 and the two brackets 4 and 5 is
This is sufficient to ensure a sealed contact between the end face of the ink duct doctor and the ink separator plate 11.

Each ink duct doctor bar 26 and 27 has an ink duct 28 or 29 and an ink recirculation hole 30 or 31.
and the ink recirculation hole communicates with a connected ink duct. Excess ink is removed from the ink duct 28.
or from 29 through a recirculation hole 30 or 31 to an ink collection tact 3 bisected by a metal partition 32.
It flows to 3. In a manner known per se, the ends of the ink duct doctor bars 26 and 27, which are remote from each other, are closed with a splash guard. Each ink duct 28 and 29
is closed at its top and bottom by doctor blades 34 and 35 supported by doctor bars 26 and 27.

Ink is supplied to the ink duct 28 by a line not shown.
．． 29.

Under the action of gravity alone, the lower part of the end face 16 of the ink separator plate 11, which is supported by the pivot, presses the outer circumferential surface of the ink roller more strongly than its upper part. The differential tilt is compensated by the tension spring 13 since the pin 10 is slidable in the slot 9. The initial stress of the spring 13 can be adjusted such that the end face 16 of the ink separator plate 11 is in contact with the ink roller under uniform pressure throughout its length. The scraping bar 21 provided at the bottom of the ink separator plate 11 only applies a low contact pressure around the ink roller 17 and prevents any remaining ink from reaching the peripheral edge portion of the ink separator plate. There is.

[Brief explanation of drawings]

FIG. 1 is an inverted top view showing the ink recirculating inking system in partial cross-section taken along line I--1 of FIG. 2; FIG. 2 is a front view in section of the inking system. FIG. 3 shows the system in partial cross-section through the ink separator plate along line 1--2 of FIG. In the drawings, 3... Pivot, 11... Ink separation plate, 17...
・Ink roller, 26.27...Doctor bar, 3
4.35...Doctor Blade.

Claims (5)

[Claims] (1) Consisting of a doctor bar and two doctor blades, the doctor blade is supported by the doctor bar and can move in mesh with the ink roller, and the doctor bar is arranged between the two doctor blades. having a groove for supplying and distributing ink, and also having means for supplying and removing ink from said groove, at least two doctor blades being provided, and an ink separator plate disposed between said two doctor blades; located between the blades and extending perpendicular to the axis of the ink roller;
pivoted on a pin parallel to the ink roller, the pin being on the center of gravity of the ink separator plate and between the ink roller and a vertical line extending through the center of gravity; The plate has the same diameter as the ink roller and has, facing it, a capped end face extending circumferentially over the doctor blade, and the plate has a capped end surface that has the same diameter as the ink roller and extends circumferentially over the doctor blade. a surface tilted by gravity into sealing contact with the outer circumferential surface of the ink roller, and the doctor bar having a terminal flat surface facing the ink separator plate and aligned with the end face of the doctor blade. A rotary printing machine, preferably a flexographic printing machine, characterized in that the doctor bar is provided replaceably in the axial direction and is forcibly brought into sealing contact with the adjacent side surface of the ink separation plate. Machine's ink recirculation inking system. (2) the pin on which the ink separator plate is pivoted extends through a slot made in the plate and extending towards the ink roller; Ink recirculation inking system according to claim 1, characterized in that the spring engages the separator plate on the center of gravity of the separator plate. (3) The ink separator plate is formed with grooves on its distal surface and is defined by a side wall having a distal edge consisting of a knife edge.
Ink recirculation inking system according to item 1). (4) The scraping bar parallel to the ink roller axis is
Provided adjacent to the lower side edge of the ink separator plate,
The ink recirculation inking system according to claim 1, wherein the scraping bar has a length that exceeds the width of the ink separator plate. (5) the doctor bar is pivoted on the pivot by means of a bushing and is pushed towards the ink separator plate by means of a compression spring, which compression spring surrounds the pivot and is fixed to the machine frame; An ink recirculating inking system according to claim 1, characterized in that the ink separator plate is supported by a fixture pivoted on a pivot. .