Patent GB-1112590-A (GB)
Abstract: 1,112,590. Storage devices for mechanical calculators. SPERRY RAND CORPORATION. 26 April, 1966 [29 April, 1965], No. 18281/66. Heading G4B. A storage device for a mechanical calculator is adapted for automatic entry into the memory unit of the last entered value, for recall of this value when a machine cycle is initiated in the absence of a keyboard entry and on depression of a storage key for storage of the value for any number of cycles until it is recalled. Operation without depression of storage key.- Initially, arms 57 (Fig. 1) and shaft 47 of the memory unit 31 are in their lowered position so that teeth 51 of memory wheels 45 are in engagement with racks 41. Control cam 143 (Fig. 8a) is in engagement with lip 141. When a function or total key is depressed lug 159 moves away from a latch 153 so that it moves away from nose 151 (Fig. 8b). Initiation of a machine cycle results in cam 143 moving away from lip 141 so that link 131 is rocked by a spring 311 counterclockwise (Fig. 8c). Upward movement of surface 319 (Fig. 1) of link 131 permits latch 315 to rotate counterclockwise. A cam (357, Fig. 2, not shown), rotating on shaft 145 (Fig. 1) rocks lever 347 so that a slide 341 is moved and hence via member 325 memory shaft 47 is raised to bring wheels 45 out of engagement with the racks 41. The raising of shaft 47 also results in stud 261 (Fig. 1) being held in notch 263 so that during the rotation of a shaft (293, Fig. 2, not shown), lever 285 is rocked and via the movement of rack 239, wheels 255 are rotated. Consequently via shaft 261 memory wheels 45 are zeroized. The cam (357, Fig. 2, not shown) then rocks the lever 347 (Fig. 1) counterclockwise to move slide 341 and hence pivot arm 325 so that the memory unit is lowered to re-engage the racks 41. When the racks are returned the value stored therein is entered in the wheels 45. Shaft 145 then re-engages cam 143 with lip 141 to return control plate 135 to the position of Fig. 8a. To recall the value stored a cycle of operation is initiated without a number being entered via the keyboard. Operation with depression of storage key.- On depression of a storage key (193, Fig. 3, not shown), a stud 173 (Fig. 10a) moves into a slot in a member 213 and a stud 167 moves into a notch 381. Entry of a value into the keyboard effects movement of lug 159 so that latch 153 rocks about pivot 155 (Fig. 10b) to release nose 151 of control plate 135. When a cycle of operation is then initiated cam 143 is moved away from lip 141 so that spring 311 rocks link 131 clockwise (Fig. 10c). Lever 315 (Fig. 1) does not move counterclockwise so that the teeth of memory wheels 45 remain in engagement with racks 41. Stud 129 however moves clockwise rocking zero comb cradle 111 in a clockwise direction so that the teeth 93 of a zero comb 91 are moved out of the path of lugs 53 of storage wheels 45. During any cycle of operation a value entered on the keyboard is first subtracted from the value in the memory and then added back in since the movement of the wheels 45 is not arrested by the lugs 53 engaging teeth 93. To recall a value, initiation of a cycle of operation rooks control cam 143 to move it away from lip 141 of plate 135 (Fig. 11b). Since the keyboard has not been actuated lug 151 remains in engagement with latch 153 so that control plate 135 cannot rock clockwise. Consequently link 131 remains in the position of Fig. 1 and teeth 93 of zero comb 91 move into engagement with lugs 53 on the storage wheels 45 so that movement of the racks 33 is controlled by lugs 53 on the wheel 45. Also during the movement of the racks 33 stud 237 (Fig. 1) of rack 239 moves against an arm 235 of cradle 233 to move the other arm 231 thereof clockwise against an ear 219 so that stud 167 of link 171 moves out of the notch 381 (Fig. 11c). The storage key is thus released and the cam 143 moves back into engagement with lip 141 (Fig. 11d).