Patent GB-528106-A (GB)
Title: Improvements in printing mechanism for calculating machines
IPC: G06C11/04
Filed: 1939-03-17
Abstract: 528,106. Typewriters &c. JOHNSON, W. E. March 17, 1939, No. 8619. [Class 100 (iv)] Printing mechanism for calculating machines includes higher and lower denominational reciprocating digit-receiving elements 8, 7 a printing element 6, 5 for each said receiving element, each printing element being movable with its receiving element and also relatively to its receiving element, and the movement of one printing element 5 from its initial position is under the joint control of both receiving elements. In this way amounts expressed in a notation (e.g., annas or lbs avoir) involving more than ten digits in a denomination can be correctly printed while employing accumulator wheels having each a number of teeth less than the number of digits in the denomination concerned. In a construction of a record-card-controlled statistical machine for dealing with annas and rupees, the annas are dealt with in two denominations ; for each of the latter there is a totalizer wheel 4 having a multiple of four teeth ; in the present instance twelve teeth. In the stop basket 1, the two columns of stops for the two annas denominations consist each of three stops 2 with a nought stop 3. In the two corresponding columns of the cards the annas are represented by holes based on the multiple of four in the higher of the two denominations, e.g., a "2" hole in the higher denomination and a "3" hole in the lower represents eleven annas since 2x4+3=11. The columns 2a of stops for the rupee denominations consist of nine stops and a nought stop in each column and coact with ten-toothed wheels in the ordinary way. Hence a carry occurs from the lower annas denomination when the wheel passes from three to nought and from the higher annas denomination to the units rupee wheel when the higher anna wheel passes from three to nought. The lower and higher annas toothed sectors 7 and 8, which are set from the stops 2, are loose on a shaft 9, as are also the lower and higher annas type sectors 5 and 6. Type sector 5 is pulled clockwise by spring 10 against the restoring bar 12 and sectors 5 and 7 tend to separate from one another, scissors fashion, under the pull of a tension spring 11. The higher sectors 8 and 6 are similarly spring-controlled. A hook 25 on the lower type sector 5 is normally held by a pin 20, the lifting of which is so timed that when bar 12 moves left the upper toothed sector 8 moves to the left, till it meets a raised stop 2, before the sector 5 is released by pin 20. Sector 6 carries the single type 32a for numeral "1" and sector 5 the type 32 indicated in Fig. 3. A lever 29, pivoted at 30 to the lower toothed sector 7, 7a, carries a pin 29 which passes through a slot 31 in the lower type sector 5 and coacts with a cam surface 27 on the upper toothed sector 8, 8a. Slot 31 has four shoulders a, b, c and d. When sectors are at zero, the pin 28 abuts the shoulder a and the type sector 5 moves the same amount as the toothed sector 7, i.e., until the heel 26 meets a raised stop 2. Hence if the card is punched "3" in the lower annas denomination and not punched in the upper annas denomination, sectors 7 and 5 move three steps left and "3" is printed. If, however, the upper toothed sector 8 is set at one-i.e., "1" punched in the upper annas column of the card-and the lower denominational hole is "3" (i.e., seven annas in all), the sector 8 moves first and the cam 27 raises the pin 28 one step so that it is arrested by shoulder b. The distance a to b adds a fourstep movement to type sector 5 under stress of spring 11 so that when the sector is moved later (hook 25 released) to move a further three steps with the toothed sector 7, the "7" type 32 is positioned for printing. The single type element 32a on the upper annas type sector 6 is so placed that it only comes into position to print when sector 6 has moved three steps. Thus in the instance just quoted "7" is printed and not "17." If ten annas is the amount, i.e., "22" punched in the card, the sectors 8 and 6 move two steps, and cam 27 raises pins 28 two steps so that it reaches shoulder c. Distance a to c adds eight steps to sector 5 and when sector 7 is released, the sector 5 moves two more steps, making ten in all, and the second "0" type 32, Fig. 3, between "9" and "1" reaches printing position. Sector 6 has, however, only moved two steps and to bring the single type 32a into printing position, the following mechanism acts when sector 5 passes through "9" to "O." Pivoted to pin 33, fast with sector 6, is a latch 35 having a hook 37, 38 engaging a recess in sector 7, 7a and having also a cam surface 35 coacting with a pin 36 fast on sector 5. As the latter passes from "9" to "0," pin 36 rocks latch 34 counter-clockwise and, owing to spring 11, latch 34 and sector 6 move one bodily step to the left as hook 37, 38 slips from shoulder 39 to shoulder 40. Sector 6 has thus moved three steps in all, and "1" is printed to give a total record of 10 annas. If the amount is fifteen annas, the card is punched "33" and sectors 7 and 8 each move three steps. Cam 27 raises pin 28 three steps so that it meets shoulder d and distance a to d adds two steps to sector 5 which subsequently moves three steps due to sector 7 to print "5." Sector 5 does not pass from "9" to "0," hence pin 36 does not reach cam 35. But sector 6 moves three steps due to the higher denominational card hole and thus prints "1." After the pin 28 has been set by the cam 27, a pawl 57 is rocked to engage teeth 59 and lock the pin 28 and lever 29 in the set position. The printing hammer mechanism 85, 86, 94, 92, 87 is as described in Specification 526,762, [Group XIX]. The control for the accumulator wheels 4 is also as described in Specification 526,762 but with a modified timing as set out in Specification 426,054, [Group XIX]. Specification 405,666 [Group XIX] also is referred to. A modification, Fig. 5 (not shown), is described for dealing with pounds weight avoirdupois.