Patent GB-766127-A (GB)
Title: Improvements in or relating to pin carriage escapement mechanism for ten-key calculating machines
Inventor: PARKER CHARLES A
IPC: G06C7/10
Filed: 1954-04-20
Abstract: 766,127. Calculating - apparatus. BURROUGHS CORPORATION. April 20, 1954, No. 11339/54. Class 106 (1). In a pin-carriage escapement mechanism for a tenkey machine, the escapement pawls are disconnected from their key-actuated tripping means by the initial movement of the escapement ratchet, and are then free to return, for the carriage to complete a full step of movement, independently of the return of the depressed key. The carriage thus completes its steps of movement during the key downstrokes, so that rapid overlapping key actuations can be made. In the mechanism shown, the carriage rack 32 has a one-way ratchet connection with an escapement wheel 26, Fig. 14, controlled tor step-wise movement, under the action of the carriage spring. 17, Fig. 6, by a pair of pawls 24 and 25 on a support 23 adapted to rock upon horizontal pivots 22. The pawl 24 is a spring- actuated lever pivoted to the support and normally holds the escapement wheel, whereas the pawl 25 is integral with the support and is disposed above the pawl 24, the support being rocked to lower the two pawls when tripped. The numeral keys (not shown) are connected by bell-cranks 51 and links 48, Fig. 9, to respective rockers 45 on which are pivoted the pin-setting members 54. A slotted universal plate 58. pivoted at 59 engages over the pin-setting members 54 and is connected by a wire 65, see also Fig. 6, with a bell-crank 66 whose long arm 69 has a cranked extension 71 overlying the pawl support 23, the pin-setting members 54 lifting the plate 58 by means of teeth 57, Fig. 9, and so lowering the extension 71 to trip the escapement. The " 9 " key has its own tripping bell-crank 80, which it operates directly, an extension 79 of this bell-crank also overlying the pawl support 23. According to the invention, the bell-crank extensions 71 and 79 depress the pawl support 23 by engagement with the tails of a pair of interponent levers 73 and 76, Fig. 14, pivoted together at 74 scissor-wise on the support 23. The tails of the levers are drawn together by a spring 77 and their free ends engage teeth of the escapement wheel. In operation, key depression, through the bell-crank extension 71 or 79 and interponent lever 73 or 76, depresses the pawl support 23 to free the pawl 24 from the escapement wheel 26, whereupon the wheel rocks the interponent levers clear of the bellcrank extensions permitting immediate return of the pawl support 23 and completion of the carriage step movement independently of return of the depressed key and bell-cranks. The mechanism provides also for independent return of the bell-crank 66; during the step movement of the carriage 15, Fig. 9, the raised pin-setting member 54 is rocked counterclockwise by a pin in the following column, so releasing the universal plate 58 and the connected bell-crank 66 during the key downstroke. The interponent levers 73 and 76 of Fig. 14 may be dispensed with, the above-described release of the universal plate 58 during carriage movement then ensuring completion of movement independently of the keys.