Patent GB-867628-A (GB)
Title: Improvements in apparatus for controlling the feeding of record sheets and the like
Filed: 1957-12-20
Abstract: 867,628. Selective printing. INTERNATIONAL BUSINESS MACHINES CORPORATION. Dec. 20, 1957 [Dec. 31, 1956], No. 39744/57. Class 100(4) Special platen rotation. The platen P of a printing machine is rotated to advance a record sheet R to selected line positions under the influence of two control tapes A and B independently fed and sensed, either or both control tapes being clutched, under control of the sensing, to the platen, and selective means for transferring the control of the platen from one tape to the other in response to data sensed. The operation of a start switch causes, through relay network and tabulator machine cam contacts, the operation of a picker clutch magnet which advances a lowermost record card from a magazine M to a presensing station P. Onerevolution clutches operate to advance the first card to first reading and second reading stations and progressively feed successive cards from the magazine in a manner described in Specification 676,155. This process continues under normal conditions until the magazine is empty. Each column of data is analyzed at the two reading stations by means of sensing commutators (162-165, Fig. 3b, not shown). The data sensed is printed in appropriate line positions on record sheets R fed successively from a hopper BFH, Fig. 2, under influence of the tape control. Sheets R are fed from the hopper BFH, by picker-knives operated by a magnetic clutch, into a pair of feed rolls 11, 12, passed sensing brushes 15, second feed-rollers 17, 18 to an aligner station 19, and third set of rollers 19, 20. The latter rollers are under control of the platen drive and during an eject cycle they serve to feed the sheet R from the aligner station to the platen in step with the particular control tape which has previously indexed to its home position. The mechanism for operating the third set of rollers 19, 20 is under control of a feed roll magnet FRM having a latch 50, which until the magnet is operated holds a follower 52 clear of a cam 53. During an eject cycle when magnet FRM is operated, a cam 53, through a follower 52, and linkage 54-60, drops roller 20 to effect feeding of a sheet to the platen and concurrently, through mechanism 61-63, pivot the aligner 19 out of the path of the sheets. With a record sheet now under control of platen and after the sheet has its last line printed another sheet is fed to the aligner station and the printed sheet is conveyed to a stacker by a line-space clutch. Rotation of the platen to advance the sheets variable distances is under control of data on the record cards and the two tapes A and B which are clutched to the platen through normally engaged clutches UCR, LCR and gears 67, 68. The clutches are controlled so that there is always one of the control tapes in step with the sheet moving from the aligner station to the platen enabling the individual sheets to be moved varying distances. The tapes alternate in function during each eject cycle to control the sheets and the feeding to correct lineposition is determined by comparison circuits set up under control of perforations in the record card and in the control tapes. Specifications 618,267,693,143 and 718,116 also are referred to.