Patent GB-336395-A (GB)
Abstract: 336,395. Friden, C. M. F. Oct. 17, [Convention date]. illultiplying and dividing apparatus. -In a motor-driven machine for the four rules the zeroizing of the totalizer and the revolutions or quotients counter on the laterally movable carriage is selectively controlled by means on the carriage adapted to couple the motor to the zero resetting devices. As shown in Figs. 1 and 2, the carriage 2 which has a rear plate 3 slidable on guideways supports a shaft 6 on which is freely mounted the totalizer numeral wheels 4 and counter numeral wheels 5. The numeral wheels are held against rotation by detents 17 controlled by spring-pressed balls 20 seated in independent rock shafts 18, 19, Figs. 5 and 6. Zeroizing-mechanism. Each numeral wheel is provided with an inwardly projecting tooth 21, Fig. 5, which cooperates with a corresponding spring pressed ball 22 seated in the shaft 6. The detents 17 for each set of numeral wheels are selectively releasable so that on the rotation of the shaft 6 in one direction one set of wheels will be zeroized and on rotation in the other direction the other set of wheels will be reset. The numeral wheels are stopped at the zero position by the transfer tooth engaging the tens carrying lever 9. To rotate the shaft 6 in either direction the operating motor 26 is geared to a pinion 30 in mesh with a pinion 31 slidable on a splined shaft 28 mounted on the carriage. The shaft 28 carries a pinion 41 at one end gearing through an idler pinion 43 on a sleeve 44, Fig. 3, journaled on the shaft 6. To the opposite ends of the sleeve 44 are secured ratchet wheels 45, 46 forming the driving members of clutches, the engaging members of which are constituted by housings 47, 49 surrounding the ratchet wheels and carrying clutch pawls, one of which 52 is shown in Fig. 2. Each pawl has a tail 54 which projects through an aperture in the housing and is normally held in inoperative position by a projection 55 on the corresponding control key 56 or 58. Secured to the housing 47 is a sleeve 48 to which is splined a driving clutch member 65, Fig. 9, having diametrically opposed teeth 67 adapted to engage notches 63, 64 in a disc 62, Fig. 8, secured to the shaft 6. The member 65 is normally spaced from the disc 62 but is moved to co-operate therewith by depression of the control key 58, the stem of which is provided with a collar 69, Fig. 3, loose on a shaft 71 and having a cam projection 72 engaging a spring-controlled recessed collar 73 carrying a shifting arm 74 engaging a circumferential slot 76 in the member 65. The stem of the key 56 acts through a similar system of clutch members and cam collars to drive a disc 62a loose on the shaft 6 but connected therewith through a reversing gearing 82 - - 85, Figs. 3 and 7, to rotate the shaft 6 in the opposite direction to that of the drive through the disc 62. Depression of more than one control key at a time is prevented by a floating collar 79 on the shaft 71 having projections engaging recesses in the collars 69, 69a. To rock the shaft 19 and release the detents, the shaft 6 has loosely mounted thereon a cam disc 92 to which is secured one member 94 of a one-way clutch 94, 95, the other member 95 of which is splined to a collar 96 secured to the shaft 6. The cam disc 92 is engaged by a spring-pressed dog 98, Fig. 6, and prevents rotation of the cam disc in a clockwise direction. When the shaft 6 is rotated in a counter-clockwise direction by depression of the control key 56 the cam disc 92 rocks the dog 98 and through a geared sector 99 rocks the shaft 19 to release the details of the revolutions counter 5. To the left hand end of the shaft, Fig. 3, is secured a collar 105, to which is splined a spring-pressed . clutch member 106 that co-operates with a clutch member 108 on a collar 107 loose on the shaft 6. The clutch members 106, 108 are similar to the members 94, 95 but have teeth facing in the opposite direction. On the collar 107 is secured a cam disc 112, Fig. 4, engaged by a spring pressed dog 113 so that on rotation of the shaft 6 in a clockwise direction on depression of the control key 58 the shaft 18 is rocked to free the detents associated with the totalizer wheels 4. Operating by motor. The depression of either control key is adapted to energize the driving motor circuit. Each key stem has a projection 131, Figs. 1, 2, and 12, which underlies a bar 132 which is adapted to move upwardly paralLel to itself and to rock a lever 135 connected by means of a link 137 to one end of a lever 128, the other end of which is off set and engages an arm 126 on a shaft 125 carrying an insulating block 124 on which is mounted the spring contacts 121, 122 of the motor starting switch.