Patent GB-907212-A (GB)
Title: Improvements in selective printing arrangements for rotary printing or duplicating machines
Inventor: BLOCK ALFRED ERNEST
IPC: B41L11/00
Filed: 1957-12-19
Abstract: 907,212. Copying documents; inking-apparatus. BLOCK & ANDERSON Ltd. Dec. 15, 1958 [Dec. 19, 1957], No. 39533/57. Class 100 (2). A rotary duplicating or printing machine for printing selected lines of a text carried on a printing drum on to copy sheets comprises a counter-pressure roller subdivided into a plurality of separate pressure segments each radially displaceable between an inner inoperative position and an outer operative position, the roller being in geared driving connection with the drum at least while any of said segments is passing through the printing bight, and preselection means for individually setting the segments in either of their positions while passing through the printing bight. The counter-pressure roller 19, Fig. 2, and the drum 10 are of equal diameter and connected by gears 28, 27. The roller 19 is formed with segments 29, each having an inward web portion 30 with notches 36 therein, and free to move radially and axially, being urged radially inwardly by springs 34. A series of keys are selectively depressed and through Bowden cables 45 move interposer lugs 40 supported in an arcuate body 43 into an inner radial position in alignment with noses 39 of the segments 29. The body 43 is moved towards and away from the roller 19, thus moving the selected segments to the left into a position wherein the notches 36 are not aligned with fixed rollers 37 aligned with the printing bight. On rotation of the drum and roller 19, the rollers 37 move each selected segment radially outwards as it approaches printing position, and after printing it is restored by the springs 34. When a selected segment reaches printing position the moistened copy sheet is fed by it and the drum, the copy sheet feed being interrupted when unselected segments are in printing position. In another form, the roller 19 is somewhat smaller than the drum, and its entire circumference is formed with segments, while only part of the drum carries a master sheet, and the roller is driven by an interrupted toothed gear on the drum, so that the roller is rotated only while the master sheet is passing the printing bight. In another form, Fig. 5, the roller 19 is of substantially smaller diameter than the drum 10, each segment being opposed to several different lines of the master sheet. Plungers 57 connected to control means are arranged one for each text line and with the drum in its initial position, selected plungers move cam elements 55 carried in the drum end-plate 50 to the left, so as to move striking plates 49 radially outwards. As a selected line nears the printing bight, a chamfered end of its plate 49 engages the nose 39 of a segment 29 and moves it to the left, then to be moved radially outwards by the rollers 37, and after parted retracted radially and axially by spring 48. In another form, Fig. 6, the roller 19 being smaller than the drum, the latter carries a series of contact plates 64 connected to a current supply source through preselector switches 66 and co-operating with a stationary contact brush 65. When a selected plate 64 reaches the brush, a solenoid 63 is energized, an abutment 60 striking the nose 39 of the segment 29 then in alignment. Inking-apparatus.-When the above arrangements are applied to a rotary relief-printing machine, the forme is selectively inked in axial strips by an inking roller with radially displaceable segments, or an inking roller arranged to make timed movements into and out of contact with the forme. Specifications 882,924 and 900,117 are referred to.