Patent GB-370662-A (GB)
Abstract: 370,662. Multiplying-machines. RHEINISCHE METALLWAAREN-UND MASCHINENF ABRIK SOMMERDA AKT.- GES., S÷mmerda, Germany. April 18, 1931, No. 11572. Convention date, April 30, 1930. [Class 106 (i).] In a multiplying-machine of the repeatedadditions type, each factor is preliminarily set from the same ten-key keyboard on setting pins and is selectively transmitted either to the differential mechanism as a multiplicand or to the multiplier apparatus as a multiplier. During the multiplying operation, one of the factors of another calculation can be set on the setting pins. Setting the factors. Either factor may be set first. The depression of a key 2, Figs. 1 and 4, lifts a lever 4 to project one of a series of pins 1 on a slidable carriage 13. Another arm of the lever 4 rocks a lever 6 to depress a lever system 9, 10, 11 to remove a pawl from engagement with a rack on the carriage 13 and so to allow a spring to step the carriage along until the next denominational set of pins 1 is presented to the levers 4. Transmitting the set factor to the differential mechanism to be used as a multiplicand. To effect this a key 43 is depressed and moves a slide 45 forward, a projection 48 of the slide completing contacts 49 in the circuit of a motor 15. Another projection 51 of the slide 45 causes a driving connection to be made through a clutch 17, 19 from gearing 16 driven by the motor 15 to a shaft 20 geared to a disc 25, Fig. 5. A bar 27 is reciprocated from the disc 25 by a connecting-rod 26 and when moved the bar allows rack bars 28 to move under the action of their springs 29 until their ends are stopped by the raised stops 1 of the carriage 13. Movement of bars to the left of the highest set denomination is prevented by pawls 30 which are moved out of operative position as the carriage 13 is stepped along. The forward movement of the slide 45 causes an inclined portion 45b thereof to move a link 52 and rock a lever 53, Fig. 8, to draw a slidable part 57 of a lever 55 pivoted at 54 into the path of a cam 60 rotated from the shaft 20. As the rack bars 28 are returned to their normal positions, a portion 60a of the cam 60 rocks the lever 55 and so shifts to the right a shaft upon which are mounted pinions 31. The pinions 31 are thus brought into engagement with teeth on the top of the rack bars 28 and with the differentialactuator setting wheels 61, the differential movements of the racks being conveyed to these wheels. The carriage 13 is returned by a cam driven from the shaft 20, another cam releases the depressed key 43 whereupon the clutch connection 17, 19 is broken, the motor circuit opened and the other parts restored by spring action. Transmitting the set factor to multiplier devices to be used as a multiplier. In this case, after the setting of the factor in the carriage 13, a key 63 is depressed to move a rod 64 to close the contacts 49 and operate the clutch 17, 19. The racks 28 then move forwards to take up their differential settings. The movement of the rod 64 also rocks a lever 65 to move a slide 66, Fig. 5, to the right and rock a hook 67 over a shaft 69. The hook is pivoted on a lever 70 acted on by the camshaped edge of the disc 25. During the return of the racks 28 the hook 27 pulls down the shaft 69 so that pinions 32 thereon may be brought into gear with the racks. The pinions 32 are also permanently in gear with " multiplier " wheels 91 to which the value set on the carriage pins 1 is thus transmitted. The key 63 is then released and the parts restored as previously described. Automatic multiplication operation. When both factors have been transmitted the multiplication key 73 is depressed. This moves a slide 76 to close motor contacts 81 and to operate a clutch 78, 79 transmitting a drive to differential gearing 82 which drives two shafts 83, 84. The former shaft 83 drives the differential actuators and the latter 84 moves the numeral-wheel carriage 85. Only one of these two shafts can be driven at any time and at the end of one revolution of the carriage-shifting shaft 84 the drive is always changed to the shaft 83. These motions are controlled by a slide 86 co-operating with locking elements 87, 88 on the shafts 83, 84. To the actuating shaft 83 is secured a pawl, not shown, which engages with the multiplier wheels 91. The multiplier wheels are each in turn rotated backwards to zero by this pawl and when such a wheel reaches zero a projection 92, Fig. 9, upon it trips a lever 94 which, through levers 95, 96 moves a slide 97 connected to the slide 86 so that the carriage 85 is moved one step and the next multiplier wheel presented to the pawl. The carriage 85 is stepped along by a pawl 99 operated by the shaft 84 and engaging a rack 98, a retaining pawl 100, Figs. 4 and 13, engaging other teeth 98a on the side of the rack. When the carriage 85 reaches the limit of its movement, a cam 101 lifts the pawl 100 and allows a spring 104 to return the carriage to its initial position. The pawl 100 is retained in its lifted position by a catch 103 which is released when the bar 76 is moved by the depression of the key 73. This catch also holds the key 73 depressed and releases it at the end of the multiplication operation. Specification 337,183, [Class 106 (i), Calculating &c.], is referred to.