Patent GB-671615-A (GB)
Title: Improvements in or relating to accumulators for accounting machines
Filed: 1950-06-02
Abstract: 671,615. Calculating-apparatus. REMINGTON RAND, Inc. June 2, 1950 [June 22, 1949], No. 13906/50. Class 106 (i). An accumulator for accumulating amounts according to a number system of non-uniform denominational orders comprises for each of several denominational orders of the accumulator a parallel linkage, a pair of intermeshing add and subtract wheels supported by each parallel linkage, a non-parallel linkage in one or more denominational orders of the accumulator, a pair of intermeshing add and subtract wheels supported by each non-parallel linkage, the wheels supported by the non-parallel linkages having a different number of teeth from the wheels supported by the parallel linkages but all of the wheels being of substantially the same pitch, a rocking device common to all of said linkages for positioning the wheels for addition and subtraction, said rocking device acting through said linkages to shift the wheels of a pair through linear distances relative to one another, and an eccentric connection between each non-parallel linkage and said rocking device whereby the wheels supported by each non-parallel linkage are shifted different linear distances relative to one another than the wheels supported by a parallel linkage. The invention is applied to the type of machine described in Specification 523,532. The accumulator or totalizer comprises two interconnected stationary frame plates 100, Fig. 1, through which a shaft 102 passes. Mounted on each end of the shaft 102 are bell-cranks 103, Figs. 1 and 4, the upstanding arms of which support a rod 104 constituting the central pivot of a rocker assembly comprising, as in the prior machines, two end links 105 each positioned inside one of the bell-cranks 103 and interconnected by upper and lower rods 106. Pivoted symmetrically on the upper and lower rods 106 are left and right-hand side-plates 107 interconnected by frame bars 108. The adjacent upper and lower plates 107 are interconnected by a link 110, Fig. 1, parallel to the links 105 and pivoted at 112 to a link 113 which is pivoted to the frame-plate 100. The totalizer includes in some decimal denominational orders intermeshing upper subtract wheels 116, Fig. 4, and lower add wheels 117 each mounted on the rear end of a lever 118, Fig. 4, pivoted on the rod 106. As described in the prior Specification, movement of the rocker assembly is transmitted to the frame 107 and the levers 118 to position the wheels 116, 117 for addition or subtraction as desired. In each denomination the levers 118 are interconnected by links 120 to form parallel linkages. The transfer mechanism is as described in Specification 523,532. Each of the add wheels 117 has a transfer tooth 131, Fig. 4, which co-operates with a pawl 130 to withdraw a latch 125 from a shoulder on the next higher pair of levers 118 which are rocked counterclockwise to effect an additional step of the associated wheel 117. In the same way each of the subtract wheels 116 has a transfer tooth 136 which co-operates with a pawl 135 to release a latch 132 of the next higher denomination. The pawls 135, 130 actuated by the highest order wheels 116, 117 each co-operate with a linkage comprising a bell-crank 138 and a bail 141 to control the latch 132, 125 respectively of the first or lowest order so as to register the "fugitive one " and provide true negative totals. The wheels 116, 117 are moved into actuating position by a shaft 160, Fig. 1, which carries an arm 158 which co-operates with links 151, 152 pivoted to the frame plates 107 in known manner. According to the present invention the lowest order wheels 116, 117 are to register " twelfths," this order therefore comprises intermeshing twelve-tooth wheels 175, 176, Figs. 3 and 5, the teeth of which have substantially the same pitch as wheels 116, 117. The wheels 175, 176 are supported by levers 177, the lower one of which is connected to the lower rod 106 in the same way as the lower levers 118. The upper lever 117, Fig. 5, is pivoted on an eccentric roller 178 journalled on the upper rod 106 and connected to a curved arm 179 loosely mounted on the lower rod 106. The eccentricity of the roller 178 and the relative positions of the pivots 183, 184 of the wheels 175, 176 are so chosen that upon movement of the rocking assembly the wheels 175, 176 are positioned to correctly engage the associated rack 115. The wheels 175, 176 are retained in mesh by a link 180 interconnecting the levers 177. During a registering operation extensions 137 on the links 120 and on the link 180 serve to disengage the transfer pawls of the wheels 116 or 117 which are not registering. The detent 188, Fig. 5, for the wheel 175 is operated in the same known way as the detents 163, Fig. 4, of the wheels 116. The upper lever 177 has a stepped shoulder 190 for determining the extent of transfer movement imparted to the wheels 175, 176 during addition and subtraction. Specifications 522,562 and 555,823 also are referred to.