Patent GB-737928-A (GB)
Abstract: 737,928. Typewriter number printing apparatus controlled by calculating-machine. WALDBERGEN, L. A. T. E. VON. Sept. 24, 1952 [Sept. 25, 1951; Sept. 2, 1952; Sept. 2, 1952], No. 23928/52. Class 100 (4). In a number-printing apparatus on a typewriter which is controlled by a calculating-machine and has devices arranged on the typewriter to operate the printing mechanism, the type racks of the calculating-machine, whose relative positions incorporate the member keyed into the machine or calculated thereby, translate the whole number group at the same time into an electrical code, and transmit the whole to a receiving device on the typewriter, where the advancing paper carriage, indirectly through place value contacts, taps off digit by digit in the direction of diminishing decimal values for printing in tabulated columns. The displaced type racks 8 are held in position by locking the crank handle 1 in position by means of a stop-lever 2 which is released mechanically or electrically, as at 64, and returned by spring 3. In the construction shown in Fig. 2 each rack s through a member 9, sliding contact 10 and contacts 11 is connected to a number key operating coil, in this case the " four " coil, which operates the key to print that number, the contact 10 being connected through a wire 12 to the place. value contacts at the back of the machine, provided for each column I-IV and for each valve, in this instance <SP>1</SP>/ 10 . As the carriage 7 moves, the sliding contact 14 connects each place value in turn to the common bus-bar 13, thus, in the instance shown, resulting in a " four " being printed in the first decimal place in column II. In the construction shown in Fig. 5 a single set of place value contacts, T for thousands, H for hundreds, L for decimal point, i.e. blank key, &c., is fixed behind the machine with bus-bar 13, and a minus rail 36 with contact rail 37, and sliding contact carriers 40, 41, 42 with contacts 14 are adjustably secured on the carriage to correspond with the column spacing. The place value contacts are connected to current rails 50, and contacts 10, not shown, controlled by the type racks 8, connect the rails to the required digit contacts. When the crank handle 1 is locked current flows through main switch 47/48, bus-bar 13, contact 14, place value contact, wire 12, and rail 50 to the number key operating coil. When contact 14 comes to place value " L " the space key operating coil L is energized through 51, but when it comes to the " - " value the space key is again operated through 50, contact 52 with the sign type rack 54 in the initial position shown, 53, and coil L. When the minus contact 44 bridges 36, 37 current flows through 55, contacts 56, 57 which are closed when the shifting segment 58 is moved on keying the first digit to be written in the minus column, and coil 59 is energized. The resulting movement of core 60 breaks contact 61/62, and moves rack 54 to its minus position, thus connecting rail 50 with contact 66, so that the minus key operating coil 68 is energized. When contact A is reached the circuit is completed through coil 64, releasing the crank handle and breaking contact 47/48. As the steps advanced by the carriage are very small a safety device is included to prevent collision &c. of the type levers. In the device shown in Fig. 3, core 17, when pulled downwardly, operates the key 15 through bar 18, and through a cross-bar 19 moves the shear members 21, 22 about pivot 23, breaking contact 28<SP>4</SP>/29<SP>4</SP> so that the circuit through 31, 29<SP>4</SP>/28<SP>4</SP>, 27, 32, &c. to energize the coil is broken. The key &c. is returned by spring 30. Thus the current through the coil is broken during a period shortly before the striking of the type until shortly before its return. The space between the shear members is adjusted at 24, 25, and spring 26 (not shown) ensures that the shears are normally at rest. In the device shown in Fig. 4 the coil core 71 through 72 and pivoted bellcrank 73 actuates arm 76<SP>1</SP> or arm 7611 of shears 76, pivoted at 74 and adjustably spaced at 77, 78, 771, 78<SP>1</SP>. A friction member 79 settable in relation to the shears rotates against a friction roller 81 received in a slot 80 therein. The roller is carried by a frame 84 pivoted at 83 and supported by an adjustable spring 82, the angle of swing being limited by set-screw 85. A bridging contact 86 on the frame normally connects contacts 87, 88 in the energizing circuit, but when the coil 70 is energized the core is attracted and frame 84 swung to break the circuit at 87/88. A groove in recess 80 holds the roller and member 79 in the normal position.