Patent GB-660455-A (GB)
Title: Improvements in or relating to a combined typewriter and calculating machine
IPC: G06F7/42
Filed: 1948-08-17
Abstract: 660,455. Calculating-apparatus. BRITISH TABULATING MACHINE CO., Ltd. Aug. 17, 1948 [Sept. 24, 1947], No. 21689/48. Class 106 (i). A combined typewriter and adding machine comprises an electromagnetic relay accumulator each order of which has a digit summation network controlled by digit representing register relays and digit set-up relays, the platen carriage causing the digit set-up relays of each of the orders of the accumulator to be energized in denominational succession as the platen carriage is letter-spaced by typing the digits to be entered. The machine operates on the quinary code and includes two relay accumulators, of which part of one only is shown, one, e.g., for subtotals and the other for a grand total. On depression of a key T1, T2, Fig. 5j, either total is typed automatically by electromagnets 48 operating the appropriate digit keys 20. The carriage of the platen 40 carries a brush 60, Figs. 1 and 5e, engaging a stationary common conductor strip 61 and, in succession, column contacts 62 connected to plug sockets 63 from which plug connections are made to direct entries in a selected accumulator as they are typed at desired column spaces of the work sheet. Column selecting relays CSU, CST, CSH, &c. for each accumulator are wired in common to the negative line 51 and have individual connections to plug sockets 65 connected by wires 69 with plug sockets 68. Eight of the plug sockets 63 at the desired position are connected by wires 66 to a corresponding series of plug sockets 67 for units, tens, hundreds, &c., and a star to denote totals connected to the transfer blades of a total control relay R17 which is de-energized when effecting entries so that related plug sockets 67, 68 are interconnected as shown. The circuit for energizing a CS relay in any order is from positive line 50, escapement contacts 21, Figs. 1 and 5e, the common conducting strip 61, brush 60 on the platen carriage, column contact 62 for that order, pulg socket 63, connection 66, socket 67, respective contact of R17 relay, socket 68, connection 69, socket 65 and wire 64 to the appropriate CS relay and to the negative line 51. When the platen carriage escapes to the next column position after the digit has been typed and the entry made in the accumulator, the CS relay for the next lower order will be energized, and so on for successive columns. When each CS relay is energized it transfers its 1, 2, 3, 4, 5 contacts, top of Figs. 5b, 5c, 5d. Entry into accumulator. Depression of a digit key 20 releases a latch 31 from a cam 32 in known manner to cause a motor-driven roller 34 to rock a carrier 35 and pull down a link 36 which propels the type-bar 38 towards the platen 40, the final movement of the type-bar operating the carriage escapement 43. The key also rocks ribbon lift bail 90 which through arm 95 operates a push-rod 96 to actuate a group of contacts 22 ... 26, Figs. 1 and 5k, in a definite sequence. Each digit key also closes contacts 27, 28, the contact 28 being used for addition and contacts 27, 28 for subtraction; these contacts select the appropriate one or more of five impulse lines 53, the digits 6-9 being entered as 5+1 &c. When a key is depressed the circuit extends from positive line 50 through escapement contacts 21 now closed, the respective key contact 28 and the related R14 contacts to the related one or more of the five impulse lines 53, and the appropriate set-up relays RS are energized in that order of the accumulator in which the CS relay has been energized by the platen carriage. All the RS relays have a return wire connection 54 to the negative line 51 to complete the circuit. RS relay transfers its 1 contact and through contacts of register relays RG and RCAU interconnected according to the table of addition energizes the appropriate combining relay RC and register relay RG. For example, to add 75 and 25, depression of the 7 key energizes RG5 and RG2 in the tens order and depression of the 5 key energizes RG5 in the units order. When . the 2. key is depressed for the next tens entry, RS2 relay in the tens order will be energized and transfer its 1 contacts, and with the RG2, 1-5 contacts in the adding circuit now transferred the impulse passes through the 1 contacts of RS4 and RS3, the transferred 2 con. tacts of RS2, the RG4-3 contacts now normal, RG3-3 now normal, transferred contact RG2-3, RG1-1, RCAT-1 to RC4 combining relays which energizes and picks up RG4. The RC5 relay is again picked up by a circuit from wire 55, RS5-1, RG5-3, R44T-1 to RC5. The accumulator now represents 95. Movement of the platen carriage energizes the CS relay in the units order and depression of the 5 keys directs an impulse from wire 55 through RS5-1 in the units order, Fig. 5d, now transferred and RG5-2 transferred to an open circuit at R44U1. RG5 in the units order deenergizes when RSE8A relay contacts open so that the units order represents O. A carry is effected to the tens order by energizing RCAT relay from the positive line 50, contacts 24, Fig. 5k, R15A relay, wire 109, RS5-3 contacts, RG5-4 contacts and RCAT relay to line 51. Units carry wire 111 causes RCAT, RCAH, and R44T to be energized causing open circuits at R44T1 and RCAT1 which prevent RG5 and RG4 being picked up when a later impulse is directed by wire 55 on closure of a contact RSE6A, the period of energization of which is controlled by condenser 102 and resistance 103. The tens order therefore represents O and a carry is effected to the hundreds order by wire 112 and network 135. In the hundreds order the RCAH1-5 contacts are therefore transferred, and when RSE6 contacts close an impulse will be directed by wire 55, RS4, 3, 2, 1 relays in the hundreds order and RCAH5 contact transferred, to RC1 combining relay which picks up RG1 register relay in the hundreds order, and the accumulator thus represents 100. Total printing. Either key T1 or T2, Fig. 5j, is depressed according to which accumulator is to control total printing. The entries in the accumulator are translated to the decimal code by RG9, RG10 contacts which select one of ten digit wires 120. Upon depression of key T1, for example, a circuit is closed from line 50, contacts 21, strip 61, Fig. 5e, brush 60 at the column position for printing from the millions order accumulator (not shown), contact 62, plug 63, connection 124, " million " plug socket 67, relay contact R17-11 transferred, socket 126, connection 125, and socket 122M to wire 121 for the millions order translator. Since this order represents 0 the " 0 " digit line 120 is selected and the current passes throughR128- 12 contact, Fig. 5j, " 0 " wire 123, R1A relay contact and " space solenoid 48 to line 51. No printing is effected, and the platen selects the hundreds of thousands order. Letter spacing continues without printing until the hundreds order is reached, in which RG1-9 contact (bottom of Fig. 5b) is transferred to select the " 1 " digit line 120 which through R128-11 energizes the " 1 " solenoid 48 to operate the " 1 " typewriter key. R1 relay transfers its R1A contacts connecting the " 0 " digit key solenoid 48 to the " 0 " digit line 123 so that subsequent zero readings will be typed. After printing the units the platen carriage escapes to the next column position and prints an asterisk. Subtraction. Closing a switch 5, Fig. 5j, energizes a subtraction relay R14, Fig. 5e, whereby the nines complements of the numbers are entered on depression of the digit keys, through contacts 27 and the digit lines 53. When the balance is negative a 9 is represented in the highest denomination by energization of its RG5 and RG4 relays and the column selecting wire 121 completes a circuit to relay R128 which transfers its contacts so that instead of a digit line 120 selecting a solenoid 48 correspond. ing to that digit, it will select a solenoid which is the nines complement so that the true digits are types. A minus sign is automatically printed ahead of a negative balance. Specifications 534,299 and 577,042, [both in Group XVI], are referred to.