Patent GB-1213825-A (GB)
Title: Data processing system
IPC: G06K17/00
Filed: 1968-10-22
Abstract: 1,213,825. Electro-photographic apparatus. RANK XEROX Ltd. Oct.22, 1968 [Oct.25, 1967 (4)], No.49997/68. Heading G2H. [Also in Division G4] A business machine for registering cash or credit sales includes xerographic copying apparatus, a keyboard for entering the value of items purchased and forming a total, a platen adapted to support sales tickets and a credit card (in the case of a credit sale), a first optical system for projecting an image of the sales tickets and credit card on to a xerographic drum, and a second optical system for projecting an image of information entered by means of the keyboard on to the xerographic drum to form a composite image of the sales tickets, credit card, and keyboard information on the xerographic drum whereby a receipt and one or more copies may be produced. The platen 104 is reciprocated beneath a lens system 131-133 to form an image on the drum 102 together with an image from an electronic display tube 152 controlled by the keyboard. A paddle wheel 160 impels a developer against the drum and the developed image transferred by a discharge lamp 172 to a sheet cut and fed from a web 166. The sheet is separated from the drum by camcontrolled fingers 180 and the image fixed by pressure rollers 186, 187. The drum is cleaned and the process repeated for more than one sheet copy, if required, and for a final copy made on a journal tape 193. Finally, the platen is ejected from the machine to return the credit card. Platen feeding-arrangement The platen is slidably mounted on a pair of guide rails and attached by a cable to a pulley freely rotatable on the xerographic drum shaft 140. A pawl pivotally mounted on an end face of the drum co-operates with a step on the pulley to transmit drive from the drum to the pulley whereby the platen is moved leftwards, Fig.5, past the scanning station. A fixed member moves the pawl clear of the pulley stop at a predetermined point in its travel to free the pulley and the platen returned rightwards to an intermediate position under the action of a spring. A solenoid-operated member engages an abutment on the pulley to limit movement of the platen to the right. After the final copy has been made on the journal tape, the member is moved clear of the abutment and the platen returned to an extreme right-hand position to project from the machine. Journal tape assembly The journal tape 193 is fed from a supply roll 810 to a take-up roll 820 in the final machine cycle. During this cycle, a spring clutch is engaged to impart drive to the take-up roll through a slip belt and to pressure fixing rolls 816, 818. The latter carries a cam 893 co-operating with a follower 894 on a reciprocable member 843 supporting an idle roller 812 and corona discharge lamp 195, whereby the journal tape is pressed against the xerographic drum and a copy made. A spring-loaded finger 827 contacts the supply roll and operates a microswitch to energize a warning lamp when the supply is exhausted. Control circuit. Settable slides on the platen co-operate with photo-electric cells to generate signals representing the number of copies to be produced, said signals being stored in a comparator. The number of copies produced is totalled in a three stage binary counter and when the output from the counter matches the signals stored in the comparator a 'journal' signal is generated to initiate the final cycle wherein a copy is made on the journal tape and the circuit reset.