Patent GB-191306951-A (GB)
Title: Improvements in or relating to Calculating or like Machines.
Filed: 1913-03-20
Granted: 1914-03-20
Abstract: 6951. Aktiebolaget Adderator. March 28, 1912, [Convention date]. Multiplying-apparatus. - In a multiplying- apparatus of the type in which the tens and units of the consecutive products of each of the numerals 1 ... 9 and all the numerals 1 ... 9 are represented by pairs of stepped plates or racks and control the differential movements of series of feelers, means are provided for printing the products, the multiplicands, and the multipliers, and for interlocking the various printing-memhers. To print the multiplicands, the pairs D, d of racks are set by means of handles and pointers to bring that portion of the racks representing the products of the digits 1 ... 9 by unity beneath the series of vertical feelers 10. When this setting operation is completed, the movement of the operating-lever causes the feelers to be brought into contact with the racks, positions the typesectors E, and releases the latches 66 of the spring-controlled printing-hammer 19 by means of thrust-rods 60 so as to force the ink-ribbon 18 against the record-strip on the platen and print the multiplicand. The preliminary setting movement removes a projection 87 from beneath the lower arm 86 of a second latch 84 for the printing-hammers, which are then latched by the member 66 only, and are released by the rods 60 as described. The carriage 11 is then moved bodily to the left to bring those parts of the racks D, d representing the product of the multiplicand by the tens' digit of the multiplier beneath the feelers 10 and to position a special " multiplier " rack 42, Fig. 6, beneath a feeler 41. The ensuing forward movement of the lever causes the multiplier to be printed. brings the feelers 10 into engagement with the racks D, d, and advances to a corresponding extent the proper actuating-sectors b for the toothed wheels a attached to the numeraldrums; on the return stroke of the operating- lever the escapement-mechanism 26 ... 28 cooperating with a toothed plate 51 is actuated, thereby allowing the numeral-wheel carriage 2 to undergo a lateral movement and to bring the wheels a into engagement with the sectors B. During the registration of the product and the printing of the multiplier, the printing- hammers 19 are locked by the latches 84, which are held in place by a bridge-piece 91 carried by the carriage 11. To print the multipliers, a special type-segment 40 co-operating with the feeler 41 and rack 42 is provided. To print the product, a shaft 93 is turned by a knob 94 and moves the numeral-drum carriage 2 so as to cause the toothed wheels to engage with the sectors B, the carriage 11 being positioned so that the bridge-piece 91 prevents a latch similar to the latches 84, 86 from being recessed, while allowing the disengagement of the latches 84 and printing-hammers 19. On the operation of the lever 9, the sectors are moved until the registration on the wheel is returned to zero by the usual interaction of the transfer parts, and the type sectors E set to print the product registered; the wheels may be cleared by releasing them from the sectors B at the end of the forward stroke of the lever, or the product restored thereto by keeping them in engagement with the sectors throughout the whole stroke.