Patent GB-689904-A (GB)
Abstract: 689,904. Calculating-apparatus. ZBRO-JOVKA BRNO, NARODNI PODNIK. Jan. 2, 1950 [Dec. 31, 1948], No. 75/50. Class 106 (i). Transfer mechanism; addsubtract mechanism. Tens transfers in the totalizer of a calculating apparatus are retained for subsequent transmission to the higher order wheels, alternately by two storage devices comprising sets of toothed transfer segments S1-S11 and S<SP>1</SP>1-S<SP>1</SP>11 on axially shiftable shafts 3, 31. In the mechanism shown, the totalizer wheels K1-K12 have transfer teeth Z, Z<SP>1</SP>, and are carried by a shaft 2 secured in a frame 1. Co-operable with the totalizer wheels are a series of differential slides T with laterally offset positive and nega. tive rack portions extending on either side of the wheels, the frame 1 and shaft 2 being shifted laterally to engage the wheels with the appropriate racks. The offset of the racks is reversed between successive orders so that the totalizer wheels alternate in their directions of rotation. The transfer segment shafts 3 and 31 are slidable in the frame 1 with their ends abutting rock levers 6, 6<SP>1</SP> pivoted on the frame. Wheels 13, 14 on an actuating shaft 12 have inner and outer arcuate projections 131, 14<SP>11</SP> co-operating with rollers 8, 8<SP>1</SP> on the lever 6 to position the shafts 3, 31 and their transfer segments relatively to the totalizer wheels. The transfer segments are bifurcated to clear the totalizer wheels when (Fig. 9) being driven by the slides T, and have recessed flanks (Fig. 2) engaged by restoring bars 18, 181 and 19, 191 extending from a slide 17 adapted to be reciprocated by cams 141 on the actuating wheel 14. Normally (Figs. 1 and 8) the totalizer wheels K lie between the offset racks of the slides T and, in entering a number to be added, the frame 1 is first shifted to the right (Fig. 9) to engage the wheels with the positive racks and disengage the upper transfer segments S now locked by their restoring bars 18, 181. The levers 6, 61 are rocked counterclockwise as the frame is shifted, the roller 8 being held by a projection 14<SP>11</SP> whilst the roller 81 is free, and this shifts the shaft 3<SP>1</SP> to the right to register the lower set of transfer segments S<SP>1</SP> with the transfer teeth Z<SP>1</SP> of the totalizer wheels. The differential slides are now released to the action of springs to enter the member on the totalizer wheels, transfers being registered by rocking of the appropriate segments S<SP>1</SP>. Next the frame 1 is restored leftward to disengage the totalizer wheels from the differential racks. The actuating shaft is then turned clockwise through 36 degrees; this first engages a projection 131 under the roller 8 to displace the shafts 3, 31 to the right and left respectively, so engaging the lower transfer segments S<SP>1</SP> each with its higher order wheel, and then, by the action of a cam 141 on the slide 17, causes the restoring bars 19, 19<SP>1</SP> to normalize the lower transfer segments S<SP>1</SP> to enter the transfers on the appropriate totalizer wheels. In this position (Fig. 10) the apparatus is ready to register a further number by repetition of the above procedure but, owing to the shafts 3, 3<SP>1</SP> and transfer segments having been shifted, the upper segments S now become effective. This alternating use of the lower and upper transfer segments provides for transfers due to a transfer from a lower order; thus, in Fig. 10, whilst the lower segments are transferring to the totalizer wheels, the upper segments register with the transfer teeth of the lower order wheels to receive transfer movements. Total taking. In total taking, the frame 1 is moved to the left, to engage the wheels K with the negative racks of the differential slides T, and the actuating shaft 12 is turned sufficiently to bring the set of transfer segments S or S<SP>1</SP>, locked at normal, opposite the transfer teeth Z. Upon releasing the slides T, the totalizer wheels are run back to zero and the amounts standing on them are transferred to the slides for transmission to indicating or printing mechanism.