Patent GB-1273102-A (GB)
Title: Improvements in or relating to calculating machines
IPC: G06C7/08
Filed: 1970-05-15
Abstract: 1,273,102. Mechanical code-converter/calculator. BURROUGHS CORP. 15 May, 1970 [30 May, 1969], No. 23567/70. Heading G4B. A printing calculator having decimal entry means and which also has the facility to act as an adjunct to data processing equipment by printing decimal amounts from binary coded input information, comprises a selector carriage 21, Fig. 10B, movable by and along shaft 199 to bring each of a set of toothed members 23 successively into communication with a gear 37, the latter entering into a respective member 23 at each communication the decimal amount 0-9 entered into a keyboard or the decimal equivalent of a binary coded amount. In the embodiment shown, the keyboard, Fig. 2, comprises keys 00, 000, 1-9 each connected to one of transverse levers 59<SP>3</SP>-59<SP>7</SP> and 59<SP>10</SP>-59<SP>15</SP> and keys 0 and decimal point connected to lever pairs 59<SP>2</SP>, 59<SP>8</SP> and 59<SP>9</SP> and 59<SP>16</SP> respectively. Each of the levers is pivoted on a bar 61, and on depression of a key the associated lever or levers engage vertical slots in one or more longitudinal slides 71A and (71B-71G), Fig. 9 and Figs. 3-5 (not shown), the slides 71A-71D being associated, in this embodiment, with the "straight" binary code 1-2-4-8 to effect a rotation of gear 37, Fig. 10B, through 1, 2, 4 and 8 teeth respectively. Slide 71A is engaged on depression of any of keys 1, 3, 5, 7 and 9, slide 71B on depression of keys 2, 3, 6 and 7, slide 71C on depression of keys 4, 5, 6 and 7 and slide 71D on depression of keys 8 and 9 and the arrangement is such that, for example, on depression of key 5 slides 71A, 71C effect a rotation of gear 37 through one tooth and then 4 teeth which rotation is entered as a total into the communicating toothed member 23. In addition, slide 71E is engaged on depression of keys 00 and 000, 7 IF on depression of keys 0, 000 and 1-9 and slide 71G on depression of any key other than decimal point to provide power at each entry operation. Slide 71A, Fig. 9, typical of slides 71A-71F, is shown engaged by lever 59<SP>7</SP> (key 1) which has cammed the slide leftwards on rods 73 from its home position of Fig. 8 (not reproduced). The slot configuration is such that a similar movement would ensue on depression of lever 59<SP>5</SP> (key 3), lever 59<SP>11</SP> (key 5), lever 59<SP>15</SP> (key 7) and lever 59<SP>13</SP> (key 9). Slide 71A is associated with a cam 105A on shaft 101 and in the leftward position of the slide a projection 72 thereon blocks movement of abutment 173 on sensing member 74 to cause raising of a shaft 169 when prong 157 of cam follower 151 meets the raised portion of the cam. Raising of shaft 169 leads to activation of a clutch 90, Fig. 10B, and rotation of gear 37 with shaft 101 for an amount comensurate with the arcuate length of the raised portion of cam 105A, which in this case is a rotation of gear 37 through one tooth. Slides 71B-71D are associated with cams 105B-- 105D, Fig. 10A, and function similarly, thee raised portions of the cams being offset suitably to give the correct decimal amount for one rotation of shaft 101. Slides 71E, 71F are associated with cams 105E and 105F respectively and through activation of a clutch (95), Figs. 14, 16 (not shown), engage a gear 135 for rotation with power shaft 85, such rotation causing rotation of shaft 199 and appropriate leftwards translation of selector carrier 21, Fig. 10B. Slide 71G through clutch 97, Fig. 10A, engages power shaft 85 with shaft 101. Transfer and printing.-From Fig. 1 it can be seen that gear-wheel 37 engages a toothed member 23 via a gear 35 and intermediate gearwheels 25, arranged as part of selector carriage 21 with one gear 15 for each toothed member 23, and that transfer occurs by bringing gears 25 into engagement with transfer wheels 29 via receiving pinions 27. Also shown are printwheels 39, paper-bearing platen 40, add-subtract wheels 41, 43 and short-cut multiplication and division wheels 45, 47, 49. Entry of binary code.--To adapt the machine to receive binary coded information means such as solenoids and associated circuitry are arranged to blockably activate the sensing members 74 associated with cams 105A-105D.