Patent GB-1129206-A (GB)
Title: Apparatus for actuating a result unit of a calculating machine, and the like, each time when the apparatus is operated
IPC: G06C23/02
Filed: 1967-02-13
Abstract: 1,129,206. Toothed and friction gearing. F. W. RUYS. 13 Feb., 1967 [17 Feb., 1966; 18 March, 1966], No. 6837/67. Heading F2Q. [Also in Divisions B6 and G4] In driving apparatus for a calculating machine, cash register, weighing device, or the type wheel or head of a typewriter, on each operation of the machine an electric motor 2 acts via a toothed or friction gear train 4 and a friction safety clutch 12 to rotate a shaft 13 from a zero position until an arm 22 thereon engages a selected one of a set of stops 21, to adjust a result unit 14-16, after which the drive is diverted to at least one shaft 33 or other member to actuate other machine functions. In a calculating machine, a pinion 14 axially slidable on shaft 13 is engageable by totalling and read-out wheels 15, 16 mounted on pivoted arms 19, 18 respectively. Wheels 15, 16 are normally held out of mesh by pawl means, not shown. Gear train 4 comprises an input pinion 3 secured on the motor shaft 1, an intermediate pinion 5 on a carrier 7 rotatable on the shaft 1 and having a gear 8 secured thereto, and a ring gear 6 secured to the clutch 12 input shaft 9. A torsion spring 10 urges carrier 7 against a fixed stop 11. Equiangularly spaced stops 21 (Fig. 5, not shown) axially slidable in a fixed disc 23 are moved into the path of arm 22, against return springs (not shown) by respective keys 20. When a key 20 is depressed, the pawl means holding arms 18, 19 is released, bringing a pair of wheels 15, 16 into mesh with pinion 14. Also a stop 21 is extended, and a switch 80 is closed to energize motor 2, a latch 25, 24 holding the depressed key 20. When the arm 22 contacts the stop 21 to arrest shaft 13 and gear 6, the spring 10 is overcome and pinion 5 planetates, rotating the gear 8 and shaft 33 which acts via a one-way clutch 30 and a toggle linkage 34-36 to move wheels 15, 16 out of mesh with pinion 14, the pawl means retaining these out of mesh. Then the latch 24, 25 is released, via bevel gears (37, 39) and a cam (40), (Fig. 4, not shown), to release the key 20 and allow the stop 21 to withdraw. The shaft 13 is thus released and continues to its zero position, a holding switch 83 controlled by a cam on shaft 13 maintaining the motor current until this position is reached. In modifications, the switches may control an electromagnetic or electromagnetically actuated clutch instead of the motor, or the holding switch 83 may be replaced by a one-revolution positive clutch. The planet carrier of gear train 4 may be biased against rotation by a spring- controlled cam detent (Fig. 6, not shown) or a spring-urged friction element. A bevel planetary gear (Fig. 7, not shown) may replace train 4. In Fig. 8, the motor shaft 91 carries a bevel pinion 93 meshing bevel gears 95 rotatable on a transverse shaft 97 secured on the end of an intermediate shaft 92. A pinion 94 integral with each bevel gear 95 meshes a rack 96 on a sleeve 98 axially slidable on but rotatable with the shaft 92. A spring 101 urges the sleeve rightwards. With shaft 92 free, the gearing rotates as a unit, giving direct drive between shafts 91, 92. When shaft 92 is arrested, gears 95, 94 are rotated to move racks 96 and sleeve 98 leftwards to actuate a lever 107 pivoted at 106. Where only small relative rotations occur, this train, or the gear train 4, mau comprise sector gears.