Printing – Inkers – Roller
Reexamination Certificate
1999-10-21
2001-12-04
Colilla, Daniel J. (Department: 2854)
Printing
Inkers
Roller
C101S352070, C101S352090, C101S352050
Reexamination Certificate
active
06324976
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for the positioning and removal of an ink chamber doctor, bearing two doctor blades, arranged in the shape of a roof, at the anilox roller of a printing machine, which is mounted in the side members of an anilox roller block, which can be slid in a guide in the direction of a press roller in a printing machine.
2. Description of the Related Art
It is known to press the ink chamber doctors, which comprise a strip-shaped housing with a central ink channel and doctor blades, which are fastened on the side of doctors and which are symmetrical to the central plane, and exhibit side seals, against the anilox roller using swivel levers and pressure medium-piston-cylinder units, which act on said levers. As a consequence of this swivelable mounting of the ink chamber doctor, the doctor blades are subject to non-uniform wear, so that, as the wear increases, the position of the doctor blades relative to the anilox roller changes because the ink chamber doctor tends to slope slightly relative to a diametral plane of the anilox roller. In the case of severe wear of the doctor blades the central plane of the ink chamber doctor can rotate so far out of the diametral plane of the anilox roller that a proper doctoring can no longer be guaranteed.
SUMMARY OF THE INVENTION
Therefore, the object of the invention is to provide a device of the type described in the introductory part that guarantees that the central plane of the ink chamber doctor will always agree with a diametral plane of the anilox roller, and in particular irrespective of the wear of the doctor blades.
The invention solves this problem with a device in which the side faces of the strip-shaped housing of the ink chamber doctor bear guide means, which are used in guides of the side members of the anilox roller block, and in which the ink chamber doctor is slid in the guides at least in its end region facing the anilox roller up to its placement in position at said anilox roller in a plane that includes both the central plane of the ink chamber doctor and also the axis of the anilox roller. An element for pressing the ink chamber doctor against the anilox roller and/or for holding the ink chamber doctor at the anilox roller may also be included.
Since the ink chamber doctor remains parallel to itself when placed in position and pressed against the anilox roller because the displacement plane of the ink chamber doctor that is its central plane aligns with a diametral plane of the anilox roller, the doctor blades, which are arranged symmetrically to the central plane of the ink chamber doctor, can wear only uniformly so that irrespective of the ink chamber doctor's degree of wear the same and correct angle position to the anilox roller is always maintained.
Expediently the guide means are arranged on supports, connected to the faces of the ink chamber doctor.
A preferred embodiment provides that the guide means comprise two bolts, which are spaced apart in the central plane, and the guides comprise grooves, recessed in the side members. These groove align with a diametral plane of the anilox roller.
Preferably the bolts penetrate a slider with two parallel side faces, which arc parallel to the plane, extending from the center lines of the bolts, and on which guide members or rolls, arranged on both sides of the last straight section of the grooves, run. This design also achieves a straight guide for the ink chamber doctor so that it is guaranteed that, irrespective of the wear of the doctor blades, the central plane of the ink chamber doctor aligns with a diametral plane of the anilox roller.
Expediently the straight end pieces of the grooves extend from a recess of the side members that is open at the top and into which the guide bolts of the ink chamber doctor can be inserted.
The bottom sides of the recesses can align with the bottom flanks of the grooves.
Another preferred embodiment provides that the bottom sides of the recesses arc provided on their ends opposite the grooves with approximately semicircular recesses, whose radius is equivalent to the radius of the bolts, that each bolt can be inserted into each recess and that at least one side member is provided with a hook-shaped latch, resting against an abutment face and with which the other bolt can be stopped after the ink chamber doctor has been swung around the bolts inserted into the recesses. In this manner the ink chamber doctor, retracted from the anilox roller, can be swung out so that the doctor blades and the ink channel arc readily accessible.
A support with inclined faces for guiding purposes can be arranged in the central region of the recess, serving the purpose of inserting the bolts of the ink chamber doctor. These inclined faces ensure that the ink chamber doctor, inserted with downward pointing doctor blades into the recess, can be correctly rotated by 90° in order to enter into the straight guide section of the grooves, which guarantee that the ink chamber doctor will be pressed symmetrically against the anilox roller.
Another embodiment of the invention provides that in the side members above the straight line guide grooves spring-loaded levers, which exhibit freely tapering slots and are connected by means of linkages or a pipe, are pivot-mounted synchronously in the side members. When entering the straight guide grooves, the ink chamber doctor's bolts, facing the doctor blades, enter into the lever's slots. These levers guarantee that the ink chamber doctor can be placed in position at the anilox roller so as not to tilt.
Expediently the levers are loaded by springs, whose tension increases as the bolts enter into the slots when the ink chamber doctor moves in the direction of the anilox roller, whereby the springs move the ink chamber doctor with a readily flexible spring action against the anilox roller, when the spring force lines have moved through the lever's swivel axis.
To press the ink chamber doctor with the necessary pressure against the anilox roller, the levers are provided with an abutment for the piston of a pressure medium cylinder.
REFERENCES:
patent: 4938133 (1990-07-01), Bock et al.
patent: 4964336 (1990-10-01), Bock et al.
patent: 5088402 (1992-02-01), Hycner et al.
patent: 5140901 (1992-08-01), John
patent: 38 32 160 (1990-04-01), None
patent: 43 08 711 (1994-09-01), None
Achelpohl Fritz
Thoele Alois
Colilla Daniel J.
Jacobson & Holman PLLC
Windmoller & Holscher
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