Printing – Inkers – Roller
Patent
1988-11-02
1991-01-29
Fisher, J. Reed
Printing
Inkers
Roller
101365, 101DIG32, 101DIG45, B41F 3104, B41F 3110, B41F 3138
Patent
active
049878310
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an inking device according to the generic clause of patent claim 1.
In the European patent specification having the publication number 113 905, a process for adjusting the the inking in an inkwell is described. The known inkwell has an inking roller and a doctor blade co-operating with the latter, subdivided into individual sections. Associated with each doctor-blade section is a setscrew and an angle piece actuatable by the latter for varying the spacing between the end of the doctor-blade and the inking roller. By actuating the setscrews, the thickness of the coat of ink on the inking roller and thus the ink density on the sheet of paper printed on can be adjusted section-wise. For proofing machines, it is advantageous if, for changing the ink, only the inkwell with the inking roller and the doctor blade is interchanged. In the known inking device, it is desirable to improve the accuracy of adjustment of the inking.
It is the task of the invention to provide an inking device in which the inking is very finely controllable.
The inking device according to the invention is characterized by the features recited in the characterizing clause of patent claim 1.
The subject of the invention is explained in more detail below, by way of example, with reference to the drawing.
FIG. 1 shows a cross-section through an exemplified embodiment of the inking device according to the invention, the sectional plane being situated between the non-depicted sidewall and the inking device,
FIG. 2 shows part of a lifter roller of the inking device according to FIG. 1, and
FIG. 3 shows the block diagram of an installation for measuring and adjusting the ink-density values of a printed sheet.
FIG. 1 shows the cross-section of a corner region of an inking device 1 of a flat-bed proofing press of which inking device only the one sidewall 2 is visible. The inking device 1 comprises an application roller 3, a pre-roller 4, a brayer roller 5, a lifter roller 6, and an inkwell 7. Disposed in the inkwell 7 are, rotatably, an inking roller 8 and, adjustably, a doctor blade 9. Fastened on the top of the inkwell 7 is an angle piece 10, the angular end 11 of which forms with the adjacent wall 12 of the inkwell 7 a groove 13 which is open downward. Between the sidewall 2 visible in FIG. 1 and the non-visible sidewall of the inking device 1 extends a rod 14. The inkwell 7 is inserted in the inking device 1 in such a way that the rod 14 is situated in the groove 13. The bottom 15 of the inkwell 7 is supported on at least two setscrews 16 which are screwed into lugs 17 of the inkwell 1 [sic].
For driving the inking roller 8, there is in an end face of the shaft 18 a recess 19 of square cross-section into which is insertable a square end on an axially displaceable and non-drawn drive shaft, mounted in the non-depicted sidewall of the inkwell 1 [sic], of a motor.
The doctor blade 9 pivotable about a shaft 20 can be shifted by means of several setscrews 21 for adjusting the inking.
The inking roller 8 is driven counterclockwise relative to FIG. 1. Only the lower part of the inking roller 8 dips a little into the nondepicted ink. By means of the doctor blade 9, the thickness of the coat of ink picked up by the inking roller 8 is regulated.
The lifter roller 6 is subdivided in its length into a number of sections, e.g., twenty. Each of the sections 6' and 6", two of which are depicted in FIG. 2, is pivoted on a two-armed lever 22. For this purpose, a necked-down bolt 23 is fastened to each of the levers 22. Placed on the necked-down portion of the bolt 23 is a roller bearing 24 which bears a bushing 25. The surface of the bushing 25 is covered with an elastic layer 26, preferably of rubber, for forming the section 6' or 6" of the lever roller.
Each lever 22 has, about in the middle, a recess to the margin of which a bearing bush 27 is fastened. Through all the bearing bushes 27 there extends a common axle 28 about which the levers 22 are pivotable independently of one another. The bearing bushes 27 may, for example, be slidin
REFERENCES:
patent: 3116688 (1964-01-01), Ward, Jr. et al.
patent: 4402263 (1983-09-01), Honkawa
Concepta Print AG
Fisher J. Reed
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