Patent GB-191203819-A (GB)
Title: Improvements in Tabulating Mechanism and Spacing Mechanism for Typewriting and like Machines.
Inventor: FAIRWEATHER WALLACE CRANSTON
IPC: B41J25/18
Filed: 1911-06-06
Granted: 1912-06-06
Abstract: 3819. Fairweather, W. C., [Underwood Computing Machine Co.]. June 6, 1911. Tabulating-mechanim.- The carriage is driven forward or backward for direct or reverse tabulation by a motor which actuates the carriage through a reversing-clutch controlled by the tabulating-keys. The invention is described with reference to the computing- typewriter described in Specification 13.445/11, [Class 106 (i), Calculating Ac.], comprising a motor 34 arranged to drive a computing-device controlled by a carriage 155 which is coupled intermittently to the typewriter carriage 7. The tabulating - devices comprise the usual decimal-stop reeds 254 actuated by decimal keys 250 and arranged to engage column-stops 257 on the carriage, which is released by lifting the feed-rack 220 off the escapement-pinion 221, by means of a bar 259 actuated by lugs 258 on the reeds. The carriage is provided with a rack 140 gearing with a pinion 139 on the shaft 138 provided with loose gears 272, 273, either of which may be coupled to the shaft by a clutch 274. The gears 272, 273 engage a gear 271 on a shaft 270 which is geared to the shaft 33 of the motor, this being arranged to run continuously and to drive the shaft 270 through a yielding friction coupling 267. Normally the gear 272 is coupled by the clutch 274 to the shaft 138 and the carriage is driven forward when released by the tabulating-keys. When it is necessary to perform reverse tabulation, the clutch 274 is set by means of a key 280 to couple the gear 273 to the shaft 138, the arrangement being such that when the key 280 and one of the tabulating-keys 250 are depressed the carriage is driven backwards for reverse tabulation. The key 280 is coupled through links 283, 286 to a rock-shaft 288 carrying in slotted arms 290 a universal bar 289 adapted to engage lugs 291, Fig. 6, on the reeds 254. This universal bar is normally clear of the lugs and is mounted in slots 292 in the arms 293 of a frame which is pivoted at 294 and is connected by a link 297 to a lever 298 which engages the clutch 274. When the key 280 is depressed the universal bar 289 is set over the lugs 291 and actuation of any of the tabulating-keys sets the clutch 274 to drive the carriage backward for reverse tabulation. Key-locks.-key 280 may be provided with a lock consisting of a lever 302, Fig. 7, which is tensioned by a spring 305 and is formed with a notch 303 to engage a pin 304 on the key. Keys.-The tabulating-keys are, as shown in Fig. 3, each provided with a forward tabulation mark, black on a white ground, and a reverse tabulation mark, white on a black ground, the arrangement being adopted in order to compensate for the thickness of the stops. Carriage-returning mechanism.-A key 330 is provided for returning the carriage independently of the tabulating-keys 250 and the reversing-key 280. The key 330 is mounted on a lever 331, engaging a special reed 332 which is shorter than the reeds 254. The lever 331 is coupled by a link 334, Fig. 7, to a cam 337 which is pivoted at 336 and engages a pin 338 on the link 283. A lost motion knuckleconnexion is provided between the lever 331 and the reed 332, so that when the key 330 is depressed the cam 337 first sets the universal bar 289 over the lugs 291 and further depression of the key shifts the clutch 270 to reverse the drive, the key being held down until the carriage reaches the initial position. Line-spacing mechanism.-The platen is linespaced automatically during carriage-return or reverse tabulation by devices of the following character. The pivoted frame 293 described above is coupled by a link 310 to an arm 312 feathered on a shaft 313 which is journaled in the carriage. The shaft is coupled by a link 317 to an arm 318 which carries the linespace pawl 321. The operation of the carriagereturn key 330 or the tabulating-keys 250 when the parts are set for reverse tabulation effects line-spacing by the engagement of the lugs 291 with the universal bar 289.