Patent GB-1039673-A (GB)
Abstract: 1,039,673. Mechanical calculating apparatus; transfer mechanism. SVENSKA DATAREGISTER A.B. May 10, 1963 [May 25, 1962], No. 18596/63. Headings G4B and G4D. An adding machine has coupled addition and subtraction wheels on a single shaft. The Specification describes a transfer mechanism operated from the machine drive, and capable of performing a transfer on one out of three occasions during a machine cycle, a sign indicating mechanism, a fugitive-one entry mechanism and addition or subtraction totalizer selection mechanism operable either at the beginning of an operation or as the result of a change of sign. Transfer mechanism.-A transfer tooth rocks a lever 28 (Fig. 1, not shown), the end 28a of which (Fig. 3, not shown) cams a member 32 so that a lug 32b lies in the path of a hooked lever 54. Three times during a machine cycle a slide 60 is cammed to the left as shown. If the transfer member 32 is clear of hook lever 54 the motion of slide 60 is transmitted only to levers 58 and 54. If, however, the lug 32b engages lever 54 to prevent its anti-clockwise motion a lever 40 is rocked clockwise about a shaft 48 to increment the totalizer wheel in position. The lever 40 is latched at its lower end. If a transfer has already been made with lever 40 latched in its operated position, the lever 54 is forced clockwise to take up the motion of slide 60. The three operations of slide 60 take account of simple carries, carries on carries and carry following the introduction of a fugitive one. Sign indicating.-The position of the lug 32b on the transfer member 30 of the highest order of the addition or subtraction totalizer is sensed by levers 104, 106 (Fig. 4, not shown) respectively. The levers are slid to the left as shown by cam-follower mechanism and can be caused to pivot by lug 32b so as to move a sign-indicating plate 114. There are two operations a machine cycle, one after the time when a fugitive one can be entered. The transfer member is reset by a lever 122b. Fugitive-one entry takes place at every change of sign. The plate 114 is rigid with shaft 134 to the other end 154 of which (Fig. 7, not shown) is attached a lever 150. On change from positive to negative sign, lever 150 rotates clockwise to cause lever 138 to add one to the lowest order totalizer wheel. Mechanism not shown or described is effective to reset lever 138 when the totalizers are brought into engagement with the actuators without, however, affecting the positions of lever 150. Change from negative to positive sign causes lever to move anti-clockwise to the position shown, again causing fugitive-one entry. Selecting add-subtract totalizer.-Shaft 24 (Fig. 11, not shown), carries the addition and subtraction totalizer wheels and is keyed by lug 162a to a plate 162 which causes axial movement of shaft 24 when slid in the plane of the Figure. The plate 162 is cranked so that lugs 178, 180 respectively engage cams 178, 180 on a shaft 70. There is an intermediate cam 174 engageable by a lever 202. The sign of the totalizer as indicated by plate 114 (see above) controls the positions of pins 192, 194 on a lever 190 relative to slots 196, 198 in plate 162. Shaft 134 is geared to a lever (Fig. 10, not shown), which rocks lever 190 so that pins 192, 194 are as shown if the sign of the totalizer is negative but are at the other ends of slots 196, 198 if the sign of the totalizer is positive. The action of lever 202 on the pins results in an appropriate adjustment of plate 162 and of the totalizer. Shaft 170 is turned by the operation differential mechanism at the beginning of a machine cycle.