Patent GB-618267-A (GB)
Title: Improvements in or relating to record-card controlled machines
Filed: 1946-07-31
Abstract: 618,267. Typewriters &c. BRITISH TABULATING MACHINE CO., Ltd. July 31, 1946, No. 22863. Convention date, Aug. 9, 1945. [Class 100(iv)] [Also in Group XIX] A machine in which record cards control the printing of data on a record strip comprises an endless perforated tape moving synchronously with and controlling the feeding of the record strip, the sensing of a succession of data on the perforated tape controlling means for feeding the record strip predetermined distances. The tape TP, Fig. 3, has perforations lt- 9t which are sensed electrically and, in co-operation with special perforations in the grouped control cards, control the feeding of the record strip; the tape is gummed at A so that it can be formed into a continuous loop TP, Fig. 16, for passing round a feeding roller 231 which has pins 232 co-operating with perforations 30 in the tape. The tape control mechanism is located at the right of the platen P, Fig. 17. It is driven by a continuously-running electric motor, the mainshaft of which carries a worm 59, Fig. 10, driving a gear 60 fixed to a shaft 63. Either of two gear trains 61, 67 or 64, 68 for high and low speed feeding respectively, are adapted to continue the drive through a clutch 103, 104 or a clutch 94, 99 to gears 107 or 108, Fig. 17, fixed to a shaft 110 carrying also a stopping disc 109, Fig. 9. The selection and operation of the clutches are controlled by relays LS and HS, Fig. 9. Energisation of magnet LS rocks a threearmed member 176 clockwise, lifting a hook 177 out of engagement with the stopping disc 109 and pressing down a T-member 181, Fig. 14, which, through an interposer 182. depresses a lug 186 on an arm 188 carrying a cam disc 200 which forces the clutch member 94, Fig. 10, into engagement with member 99 and so completes the slow-speed drive. If magnet HS, Fig. 9, is energized first, however, an arm 205 is rocked counterclockwise about a pivot 206 moving interposers 182, 183 Fig, 14, relative to the T-member 181 so that subsequent depression of the latter causes movement of the cam disc 201 to operate the clutch mechanism 103, 104, Fig. 10, for the highspeed drive. The longitudinal movement of interposer 182, Fig. 14, following energization of relay HS is transmitted by an insulated button 215, Fig. 9, to close contacts 216 to cause energization of relay LS. The drive to gears 107, 108, Fig. 17, is continued to integral gears 161, 162 comprising clutch teeth 167 adapted to engage similar teeth 168 on a disc 159 which is mounted on a sleeve 158 slidable along shaft 113 under the control of an arm 172 engaging between flanges 173 on the sleeve. The arm 172 is manually controlled from a knob D, Fig. 16, through a simple linkage 306 to engage or disengage clutch 167, 168. When the clutch 167, 168 is in engagement, the drive from the sleeve 158 is completed through a pin 156, bevel gears 151; 142, 150 to shaft 113, and thence through a coupling 122 to the platen P. Normally no relative movement occurs between the bevel gears 151, 142, 150, but this arrangement provides for fine adjustment of the platen by manual operation of a knob 136 which, when rotated, causes the planet bevel 142 to be carried round, rolling on the teeth of bevel gear 151. By virtue of the fact that bevel gears 150, 151 have different numbers of teeth, the second bevel gear 150 is thus given a slow motion which provides for fine adjustment of the platen, coarse adjustment being provided for by a knob 123 fixed to the shaft 113. The tape drum 231, Fig. 17, is mounted on the shaft 110 carrying the gears 107, 108 and comprises pins 232 for engaging perforations 30, Fig. 3, in the tape, a metal surface for co-operating with the six sensing brushes at each side of the centre, and commutator segments 242 set in insulation 241 for co-operation with further sensing brushes. The tape TP, Fig. 16, is passed over the drum 231 and over one of three supports 256, according to its length, the supports being carried on a slidable frame 247 clamped in position on a slidable 249. The tape sensing brushes B1 are mounted in a frame 263 pivoted at 266 which is swung upwards to facilitate fitting the tape. After fitting, the frame is pressed down until a latch 271 engages beneath a square pin 273. In this position a protruding portion 261 presses on the tape, tautening it. To avoid sparking at the brushes, a pair of contact breakers 285, 286, co-operating with arms 291, 292 and contacts 295, 296 provide that no current is supplied to the sensing brushes when they are just about to enter or leave a perforation in the tape. The type-selecting mechanism, Fig. 7, comprises a bar T, carrying type arranged as shown and moving upwardly in synchronism with the sensing of a card, Fig. 6. The presence of a perforation in one of the positions 9-1 causes energisation of a magnet PR and, through linkage 129, 128, 127, 126 causes an abutment 118 to engage the corresponding step 117 and so stop the bar T with a type Z, Y or X &c. opposite the platen P. The member 118 is held by a lever 131 rockable about a shaft a under the control of a bail 133, until the sensing of the O, X and R positions, when upward movement is resumed until a spring-urged pawl 139 is released to engage in one of the teeth O, X, R in the lever 131. A second impulse to the magnet PR effects this release through a linkage 147, 146, 140 previously rendered inoperative by a bail 148.