Patent GB-1082528-A (GB)
Title: A device for preventing the capacity of calculating machines from being exceeded
IPC: G06C15/00
Filed: 1965-10-22
Abstract: 1,082,528. Calculating apparatus. OLYMPIA WERKE A.G. Oct. 22, 1965 [Oct. 24, 1964], No. 44855/65. Heading G4B. In a calculating machine having at least one. setting mechanism 16, one multiplier 36 and one product register 31, a device for preventing the capacity from being exceeded comprises a setting member 55 which embodies the number of decimal places in a number set up in mechanism 16, connected via a coupling device 56 to 60 to a locking mechanism 5 for the multiplication starting key 2, and to an arrangement 70 to 76 which senses the multiplier register 36. Locking mechanism comprises a member 6, locking slide 9 movable in its longitudinal direction and connected to member 6 by pin 10, locking lever 12 having a projection 126 engaging slide 9 when in the locking position, and draw wire 14 connected to lever 12. In the locking position shown, the extension 3a of key stem 3 cannot rotate member 6 and therefore cannot move downwards. Differential mechanism comprises transmission members 24 (one shown) mounted side-by-side and pivoted about shaft 25. The members 24 are each subject to springs 29 and rest with a sensing projection 26 on a restoring rod 30. The sensing projections 26 sense the position of displaced pins 19 of a setting-pin-carriage 16. Each member 24 has toothed rims 27, 28 with which the counting wheels 33, 34 of the products register 31, and the storage members 37 of the multiplier register 36 can be brought into engagement respectively. Setting member and coupling device.-The setting member 55 has secured to it a pin 56 which co-operates with a recess 58 in coupling latch 57 which in turn is mounted on the arm 66a of a transmission lever 66 for pivoting about a pin 59. A spring 60 tends to pivot the latch 57 in a clockwise direction. The latch 57 also carries a pin 62 which co-operates with a cam slot 64 in a lever 63 which at its opposite end is connected to wire 14. Sensing mechanism comprises a link 70 pivoted by means of pin 78 to the end of arm 66b of transmission lever 66. Link 70 has a slot 70a which corresponds to the number of sensing levers 42 missing, e.g. 4 in the lower value places of the multiplier register 36, and a projection 70b which bears against locking pin 71 when in the normal position. Slot 70a co-operates with a pin 79 of locking slide 72 which has two slots 73a and 73b. Also provided on the locking slide 72 is an extension 75 which carries sensing projections 76a-76e (Fig. 3, not shown) which sense an arm 42b of levers 42 when a value is fed into the associated storage member 37. Operation.-As illustrated in Fig. 3 (not shown) when a multiplier having one to four digits has been fed into the storage wheels 37 none of the sensing levers 42 are pivoted and when the multiplicand is set up in mechanism 16, the transmission lever 66 can follow the setting member 55. After seven steps, the slot end 73e bears against the guide pin 74b. After three more steps, the end of slot 70a bears against pin 79. From the first to the tenth step, the pin 62 slides in the straight portion of track 64 and during this time cam lever 63 is in its release position 63a<SP>1</SP>. As shown in Fig. 3 an eleven place multiplicand has been set and pin 56 has left recess 58 which has allowed latch 57 to pivot in a clockwise direction, as a result cam lever 63 is restored to its locking position.