Patent GB-304121-A (GB)
Abstract: 304,121. Friden, C. M. F. Jan. 14, 1928, [Convention date]. Multiplying and dividing apparatus. - In a machine for the four rules a grand total register is provided in addition to the product totalizer. The total register is normally out of engagement with the product totalizer and power operated means are provided to put the registers into engagement, to transmit the amount standing on the product totalizer to the total register, and to reset the product totalizer the transfer mechanism, associated with the total register, being operated after the totalizer has been zeroized. The invention is shown applied to a machine of the type described in Specification 229,642. The operation of the usual rotary actuating elements 3 in either direction transmits the amount set on the keyboard through intermediate pinions 4, Fig. 1, to the product totalizer pinions 6, the totalizer being provided with the known form of transfer levers 7 and co-operating pins 9. Overthrow of the pinions is prevented by an escapement latch 12 controlled by a spring 16 seated in a rocking bar 17. The numeral wheels 5 are rotatably mounted on a normally stationary hollow shaft 21, Figs. 12, 13, surrounding a fixed shaft 22. The shaft 22 has a longitudinal groove 23 and the shaft 21 has a series of holes 25 in alignment with the internal projections 24 on the enlarged hubs of the numeral wheels. In each hole is disposed a ball 26 which normally rests in the groove 23; when the shaft 21 is rotated to zeroize the numeral wheels the balls are projected and in their rotation pick up the projections 24 to reset the wheels the balls falling again into the groove at, the zero position. A cam disc 28. Fig. 4, on the end of the shaft 21 through a lever 29 rocks the shaft 17 to free the escapement latch 12. The numeral wheels 33 of the total register are mounted on a normally stationary hollow shaft 34 and each is provided with a pinion 35, a spring detent 36, and transfer pin 63 the zeroizing arrangement being similar to that described above. In order to transmit values from the product totalizer 5 to the total register the numeral wheels are moved bodily to bring the pinions 35 into engagement with the pinions 4. The shaft 34 is provided at its ends with squared portions seated in slots in hubs 44, 44<1>, Figs. 2 and 6, and journaled in slides 46, each slide having a projecting pin 48 engaged by an arm 49 under the control of a cam disc 51 secured to the shaft 21. The shaft 21 carries a pinion 53, Figs. 2 and 5, and is driven from the operating shaft 54 through pinions 55, 56 and a mutilated gear 57, a second mutilated gear 58 being adapted to drive a pinion 61 on the hub 44<1> of the shaft 34. The gears are so arranged that the gear 57 first meshes with the gear 53 and rotates the shaft 21 one revolution and moves out of engagement before the gear 58 meshes with the pinion 61. At the end of the revolution of the shaft 21 the total register is disengaged and the pinion 61 is actuated to rotate the shaft 34 through two revolutions for the purpose of effecting the transfer operations. Transfer mechanism.-Secured to the shaft 34 between each two numeral wheels is a slotted disc. 71, Figs. 8 and 11, and pivoted to each disc is a lever 72 provided with pins 75, 76 one on either side. The lever is normally held in outward position by a spring 74 so that the pin 75 lies outside the plane of a shoe 67 on a corresponding lever 64, Fig. 10, pivoted on a shaft parallel to the shaft 34. When a lever 64 is rocked by a transfer tooth 63 engaging a projection 65 on the lever the shoe is moved to its outer position so that on rotation of the shaft 34 the pin 75 meets the bevelled edge of the shoe and is forced inwards together with the lever 72 whereby the pin 76 engages a tooth of the next higher pinion 35 and advances it a unit step. Each disc 71 has a projection 78 for restoring the lever 64 to inoperative position. As the shaft 39 is held stationary during the zeroizing operation it must be rotated with the shaft 34 to enable the consequent transfer operations to be effected and for this purpose the shafts 34, 39 are yieldingly connected by spring-pressed balls 81, Fig. 2, the shaft 34 being rotated in one direction for the transferring operation and in the opposite direction for zeroizing. To prevent rotation of the zeroizing crank handle 91 during transfer operations the hub 44 has secured thereto a stub shaft 83, Fig. 2, to which is splined one member 84 of a one-way clutch 84, 85, the member 85 being secured to a shaft 86 geared to the crank 91. Zeroizing mechanism.-As described above the resetting of the numeral wheels is effected by the rotation of the hollow shafts 21 and 34, carrying the wheels. During the operation of zeroizing the total register, the inner shaft 39 is locked against movement by a stub shaft 92 within the aligned hollow stub shafts 83, 86 and having a half round end engaging a half round end on the shaft 39. On the initial movement of the crank 91 a cam disc 93, through a pin 94 on a slide 95, moves the slide so as to engage the forked end 96 with a squared end 97 on the shaft 92. Operating by motor.-The driving shaft 54 has a telescopic connection with a driving hub carrying a gear 109, Figs. 2 and 16, adapted to be driven through gearing from a motor 102. The shaft of the gear carries a ratchet pinion 104 within a housing 105 having a pawl 112, Fig. 7, forming a clutch controlling the operation of a gear 106 connected with the gear 109. The, pawl is normally held out of engagement by a control lever 114 operated by a key lever 115. In order to provide for several rotations of the clutch housing 115 without declutching, the shaft of the gear 107 carries a cam 121 with which co-operates an arm 123 to hold the key lever 115 depressed for a period slightly less than the time required for three revolutions.