Patent GB-191105283-A (GB)
Title: Improvements in Calculating Machines.
Inventor: REIN ROBERT
Filed: 1911-03-02
Granted: 1911-11-30
Abstract: 5283. Spitz & Co., L., and Rein, R. March 2. Multiplying and dividing apparatus.-A machine in which the product of two digits is obtained directly, and not by successive additions, is provided with levers having, each, a number of fulcra any one of which is adapted to be temporarily fixed according to the particular key depressed in the corresponding bank, so that the movement of the end of the lever may be proportional to the product of the numeral of the key depressed and the numeral corresponding to the amount of rotation imparted to the multiplying-lever. Each key-lever 1, arranged below the keys 15 of its bank, is forked at its rear end to engage a pin on a rack 5, and at its front end is pivoted to a rack 9 actuated through gearing 10, 11 from the multiplying-lever 12. Each key-lever is provided with a sliding block 14 which is movable in a slot 13 and carries the fulcra I-IX. The depression of a key, through a projection 22, Fig. 2<a>, on the key-stem 21, forces a pin 18 into an aperture 20 on the sliding block, thereby fixing the fulcrum corresponding to the key depressed. The pins 18 are slidably arranged in a bar 10, Fig. 2<a>, and are normally prevented from engaging the apertures 20 by means of springs. The racks 5 transmit their movements to the totalizing-counter 28 by means of gearing 24, 25, 26 or 29, 30, when the machine is performing respectively, multiplication and addition, or subtraction and division. A second counter or printing - mechanism 31 is also adapted to be brought into engagement with the pinion 30. Keyboards; keyboard interlocks.-The keys 15 are locked in their depressed positions by means of pins 34 on a bar 36, Fig. 2, engaging a lug on the key stems. The bar 36 is kept locked until the multiplying-lever returns to its normal or zero position so that a key can only be depressed in this position of the lever. For this purpose, a locking rod 41 is provided, which is moved vertically by means of a rod 44 engaging a cam-slot 46 in the pinion 10. In the normal position, the rod 41 is opposite a notch 43 in the bar 36, but in the lower position, the rod 41 lies in front of the end 42 of the bar 36 and prevents the bar from moving. Depression of a zero key locks the corresponding rack 5 by means of a spring pin 37 engaging a notch in the rack. The keys can be returned simultaneously by depressing a release key 47 to rock a shaft 49 which has an arm 50 engaging a notch in the zero keys. Levers 62, Fig. 5, which serve to set the machine for the four rules, are provided with cam surfaces 64 which in the dotted position " A " push back a slide 65 whereby a pawl 66 thereon releases the face 67 of a sleeve 68, so that the latter turns until the face 67 engages the corresponding face on a lever 58. To the lever 58 is attached a slide 53, which is provided at the other end with a roller resting on a pawl 60 pivoted to the arm 48 and adapted to rise when the slide 53 is withdrawn, and the return of the slide 53 by the action of a spring 54 rocks the shaft 49 to release all the depressed keys automatically. The lever 58 is actuated to withdraw the slide on the return movement of the multiplying-lever by means of a pin 71 thereon engaging a lug 70 on the sleeve 68. Operating-means.-The pinion 11 is actuated by a pin 75, Fig. 3, on the multiplying-lever, which engages a triangular aperture 74 formed in the pinion. This aperture is arranged to allow an initial movement whereby the counters are brought into engagement with the gearwheels before actuating the pinion 11. This engagement is effected by providing each setting-lever 62 with a cam 78, Fig. 9, which, when the lever is moved to the position M or A, engages the forked ends of a lever 80 pivoted at 79 and moves it to the dotted position, so that a pin 86 on the lever 80 may lie in the path of the bevelled edge 84 of the segment 76 which is frictionally coupled to the shaft 73 carrying the multiplying-lever 12. Further rotation of the lever 12 through the segment 76 imparts an additional movement to the lever 80, which then turns about the spindle 63 as pivot, and through the rod 83 moves the counters into engagement. To shift the counters laterally when performing multiplication or division, a pawl 87, Fig. 3, is actuated to advance the mechanism by the oscillation of a lever 90 through a roller and cam-slot in an arm 93 on the multiplying-lever. Adding and subtracting.-The lever 90 is locked to prevent actuation of the pawl in the addition and subtraction position by means of a projection 98 on the slide 65 which engages a projection 99 on the lever 90 and moves the roller thereon into a position to engage the inner edge of the slot 92. The roller in this position also acts as a stop to limit the movement of the multiplying-lever to the extent of a single unit. Error levers.-To correct an error in the setting without cancelling a calculation already made, the multiplying-lever is provided with a lever 103 adapted to maintain engagement between the pin 86 and the segment 76 until the lever has returned to the correct numeral. The lever 103 is raised by an arm 105 to rock a lever 109, Fig. 7, on the spindle of which is secured an arm 110 engaging a boss on the segment 76. Dividing.-When performing division it may be desirable to prevent actuation of the counter while the lever is moving from one digit to another. This is effected by holding the counter out of engagement by means of an arm 113, which depresses the lever 103 to move the arm 110 in the opposite direction to that above described.