Patent GB-734158-A (GB)
Title: Calculating machine
IPC: G06C7/08
Filed: 1953-08-25
Abstract: 734,158. Calculating-apparatus. ARVA SOC. ANON. Aug. 25, 1953 [Oct. 7, 1952], No. 23393/53. Class 106 (1). A calculating-machine has a set of toothed registering members mounted in a laterallymovable carriage and rockable about a shaft which is bodily movable so as first to couple the registering members with setting members while the latter are differentially positioned under the control of a single-bank keyboard and then to engage the registering members with totalizer pinions so that the latter may be actuated thereby. Depression of a number key 3, Fig. 3, moves a corresponding slide 15 rearwardly to rock through a lever 19 a pawl 63. The first of a series of rack bars 61, slidably mounted in a carriage 28, Fig. 4, is thus released for upward movement under the action of a spring 58 until a toe 70 thereof engages a stop-surface 23 of the operated slide 15. The lever 19 also rooks an arm 26 to actuate an escapement mechanism 32, 33 mounted on a bar 34 of a large carrier 10 and co-operating with a rack 31 of the small carriage 28. The other rackbars 61 permanently engage pinions fast with item indicator drums 68 and initially engage pinions 45 fast with toothed segments 44, Fig. 6, rotatable on a sleeve 42 .secured between plates 43 located within the small carriage 28. The sleeve 42 is slidable along, and rotatable with, a shaft 41 mounted in arms 38 fast with a sleeve 37 rotatable on a shaft 39. When an amount has been set, a control key is operated to initiate a motor-driven operation in which the large carriage 10 is first released to the action of a spring to carry the. small carriage into line with the totalizer 9. The shaft 39 is then rotated and drives through a ratchet-wheel 72 and pawl 71 a mutilated gear 46. A cam groove in this gear 46 co-operates with a roller in an arm 54 coupled to one of the arms 38 to rock the arms 38 so as to carry the differentially-set segments 44 into engagement with pinions e1 directly geared to the totalizer wheels 9 for addition or with pinions e2 geared to the totalizer wheels through intermediate pinions for subtraction. At this time, a locking-bar 73 supported by the plates 43 is released to the action of springs v which engage the bar with the teeth of the pinions 45. During the movement of the arms 38, a plain portion of the gear 46 engages a concave part of a disc 49 fast on the shaft 41. Toothed portions of the gear 46 and disc 49 then co-operate to rotate the shaft 41 through 180 degrees during which the amount set is entered into the totalizer. During this movement, cams secured to the small carriage 28 maintain the locking- bar 73 in engagement with the pinions 45. The arms 38 are then partially restored, further blank surfaces on the gear 46 and disc 49 preventing rotation of the shaft 41. Further toothed portions on these members then again rotate the shaft 41 through 180 degrees, after which the arms 38 are fully restored to reengage the pinions 45 with the rack-bars 61. This sequence may be repeated, an operation counter being provided. The rack-bars 61 and segments 45 may be zeroized by operation of a control key or a hand-crank 2 which serves to rotate the shaft 39 in a reverse direction. A cam coupled to the shaft 39 by a pawl-andratchet is thus rotated to rock a bail 79, Fig. 12, engaged by rollers of a frame 83 carried by the small carriage. The frame 83 is thus depressed and engages projections on the rack bars 61 to zeroize them. Operation of a further control key causes the motor to restore both carriages to their initial positions. Specification 734,159 is referred to.