GB737241A - Improvements in or relating to book-keeping, calculating and like machines - Google Patents

Abstract

737,241. Calculating-apparatus. AKTIE-BOLAGET ADDO. Sept. 9, 1953 [June 11, 1953], No. 24981/53. Class 106 (1). A calculating-machine has a paper carriage driven through a screw- and nut mechanism by reversible power means which when operating in one sense are connected also to the main driving mechanism of the machine, but when operating in the other sense are automatically disconnected therefrom. A reversible electric motor 8 drives a screwthreaded shaft 22 through a flexible coupling 16, pulleys 19, 21 and a clutch comprising driving dogs 26 which co-operate with a lug 27 of a pawl 28 pivoted on a driven disc 30. A nut 25 mounted on the carriage 2 is engaged on the shaft 22. The clutch is controlled by a lever 36 having a tooth 35 which co-operates with a recess in the disc 30. The lever 36 is controlled by a bifurcated lever 39 carrying a roller 43 which runs on a bar 4 of the carriage and is engaged by adjustable stops 5, and also by a cam 47 on the main shaft which is driven by the motor 8 through a one-way coupling 10, 11 and gears 13, 15. Towards the end-of a cycle of the mainshaft, the cam 47 temporarily disengages the lever 36 through a lever 49 and so engages the drive to the shaft 22 to tabulate the carriage. A switch 54 controlled by the lever 39 and in parallel with the initiating switch, holds the motor circuit closed after the completion of the cycle of the mainshaft. When the next columnar position is reached, a stop 5 rocks the lever 39 so as to release the lever 36. The tooth 35 then locks the driven-disc 30 and is engaged by a lug 33 of the pawl 28 which is thus rocked to remove the lug 27 from the path of the driving lugs 26. The lever 39 also opens the switch 54 to stop the motor. A starting key may then be;depressed to initiate a further cycle of the mainshaft, at the end of which the carriage again tabulates. When the carriage reaches its end position, an abutment 6 operates a reversing switch 52 in the motor circuit. The motor then returns the carriage until a further abutment 7 restores the switch 52, after which the carriage is stopped by the first stop 5. During the return movement, the coupling 10, 11 to the mainshaft is disengaged. Moreover, the stops 5 merely raise the roller .43 idly in guide slots 42 in the bifurcated end of the lever 39 against a spring 44. Different speed governors may be arranged to be effective during the tabulating and return movements respectively. The reversing switch 52 may be replaced by a reversing gear.