Patent GB-1320369-A (GB)
Title: Calculating device for a calculating machine
IPC: G06C15/26
Filed: 1970-03-06
Abstract: 1320369 Totalizer RICOH KK 25 Aug 1970 [27 Aug 1969] 40869/70 Headings G4B and G4D A calculating device comprises a totalizer having ciphered wheels 8 drivable in rotation by friction by means of a shaft 7 on which they are idly mounted, each wheel 8 bearing a carry-over abutment 14. A locking device for the ciphered wheels 8 has for each wheel two looks 29. A carry over device comprises for each ciphered wheel 8 a first pivoted carry-over lever 37 having an arm 38 which is normally located on the trajectory of the carry-over abutment 14 of the associated ciphered wheel, and a second arm 39 that co-operates through a second pivoted carry-over lever 36 with the locks 29 associated with the ciphered wheel corresponding to the immediately higher decade. The arrangement is such that the first carry-over lever 37 is pivoted by the passage therepast of the carry-over abutment 14, to prepare the second carry-over lever 36 for a carry operation. Entry of numbers.-A number of intermediate storage wheels 3 are mounted on a drive-shaft 2. Each wheel 3 bears a number of elements of any known form that can be set into active or inactive positions to represent a stored digit. Rotation of the shaft 2, manually or by a motor, causes, through a gear train and reversing mechanism (not further disclosed), rotation of the totalizer drive-shaft 7 at a higher angular velocity in either direction for addition or subtraction. Any ciphered wheels 8 that are not locked against rotation by the locks 29 are rotated by friction with the drive-shaft 7, through one tenth of a revolution for each element in active position on the corresponding storage wheel 3. Any carry-over occurs at a later stage of the cycle of shaft 2. The ciphered wheels 8 are of hollowed plastics, and are stacked on the drive-shaft 7 against a spring force, the totalizer being mounted on a plastics support 15. Locking.-Each ciphered wheel 8 is normally locked against rotation by co-operation of the two locks 29 with a pair of wheel abutments, the ciphered wheel 8 having a total of ten abutments 13, 14. As the associated storage wheel 3 rotates, an attached element set in an active position abuts the cam surface 31 of a lever 30, to rotate the lever 30 about a fixed shaft 20. An arm 33 of the lever 30 is moved to pivot the locks 29 about respective fixed shafts 20, 21 against the action of a spring 25, to free the associated ciphered wheel 8 for rotation. The storage elements release the lever 30 so that the locks 29 return to co-operate with and lock against the next abutment 13 around the ciphered wheel. When several storage elements in succession are in an active position on a wheel 3, the elements meet the cam surface 31 in rapid succession to limit the necessary angular movement of the locks 29. Carry-over.-As a ciphered wheel 8 completes a revolution, the carry-over abutment 14, which is more prominent axially than the remaining nine abutments 13, rotates the first carry-over lever 37 about the support 20. The rotation removes the arm 39 from co-operation with a shoulder 40 on the second carry-over lever 36, but a pivoting of the second carry-over lever is limited by an abutting shoulder 50. The shoulder 50 forms part of a stirrup 48 that co-operates with a cam 46 mounted on the drive-shaft 2; during the transfer of values from storage wheels 3 to the ciphered wheels 8, part B of the cam 46 is in an operative position. When valus transfer is complete, part C of the cam 46 becomes operative, to allow a clockwise rotation of the stirrup 48 around the shaft 20, accompanied by a clockwise rotation of the second carry-over lever 36 by a spring 45 about shaft 21. A lever portion 42 strikes the ends 28 of the locks 29 that are associated with the ciphered wheel 8 corresponding to the immediately higher decade, so freeing that wheel for rotation. The upper ciphered wheel 8 rotates through one twentieth of revolution until stopped by a finger 43 of the second carry-over lever 36. Finally, part A of the cam 46 becomes operative to rotate the stirrup 48 and the second carry-over lever 36 anticlockwise, remove finger 43 from abutment, and allow the locks 29 to relock the ciphered wheel 8 after a further onetwentieth of a revolution. Zeroizing.-Rotation of a stirrup 51 about shaft 20 lowers a flap 52 to rotate all the levers 30 and free all ciphered wheels 8 for rotation until stopped in zero position by co-operation between the carry-over abutment 14 and a stop 55. The stirrup 51 is held in a rotated position by a catch (56) (see Fig. 2, not reproduced); the catch (56) is released after zeroizing by an abutment (58) carried by the cam 46 (Fig. 1). Swiss Specification 485,274 and U.K. Specification 1,279,655 are referred to.