Improvements in or relating to Calculating Machines.


21,025. Leumann, R. Sept. 30. Calculating-apparatus; counting-apparatus.-An adding and subtracting machine which h multiplies by repeated addition and divides similarly is shown in plan in Fig. 1. The numbers seen through the front holes 34 indicate the product, difference, sum, or remainder, and those seen through the back holes 69 the multiplier or quotient. Fig. 2 shows a vertical section through the spindles 18 of the figure discs 19. Two sleeves 26, 27 are loosely mounted on each spindle 18 and carry discs 20, 22, which are in frictional contact through the spring 44. The discs 20, 19 are similarly connected by the weaker spring 21. The discs 20, 22 each carry a tooth 70, 71, the tooth 70 engaging a fixed pin 33 or a movable pin 32. The outer sleeve 27 carries teeth meshing with those of a rack 35 which actuates the machine, and also bears the loose toothed ring 23, which rotates with the ring 27 when a pin 28 and tooth 29 are in contact. The spindle 18 is fixed to two toothed wheels 24, 25, the latter of which carries a projection which actuates the tens-carrying device and a tooth 30. The carrying - device consists of a sleeve having three discs 41, 42, 43. The disc 43 has four arms and is driven by the projection; the disc 42 has four pairs of teeth meshing with those of the ring 23, and the disc 41 has four teeth which drive the wheel 24. The piece 50 with its locking-springs 73, Fig. 3, is moved by the rod 36 and its lever 45, Fig. 2, which moves also the band 37 with its studs 38, used for returning the figure discs 19 to zero. The multiplier-indicating disc 57 is shown in Fig. 7, and receives motion from the upper wheel 65 of three wheels 65, 64, 63. The wheel 63 has eight teeth, and is moved by the projection 71 of the disc 22. The wheel 64 has four grooves, into which one of the spring pawls 68 may fit, and the wheel 65 carries four teeth. The device shown in Fig. 3 for returning the multiplier-indicating disc to zero consists of the plate 58 carrying the loose toothed wheel 52, which is slotted eccentrically and driven by the rack 53. The wheel 52 carries a pin 55, and the disc 57 carries a corresponding lug 56. The spindle of the disc 57 passes through a hole in the plate 58, this hole having a tooth projecting radially inwards and a groove projecting outwards. The machine is covered by a lid 17, which rotates about or slides along the rod 48.




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