Patent GB-191122340-A (GB)
Title: Improvements in Paper Carriers and Operating Mechanism therefor for Typographical Calculating and Analogous Machines.
Inventor: WALKER GEORGE
IPC: B41J11/00
Filed: 1910-11-18
Granted: 1911-11-20
Abstract: 22,340. Walker, G. Nov. 18, 1910. Paper-carriages; paper feeding and guiding arrangements.-(1) A hollow platen 244, Fig. 1, is mounted by heads 244<A>, 244<B> in end pieces 241, 241<A> forming with tracks 242, 242<A> and one or more semicircular braces 273 a frame adapted to be readily inserted in and withdrawn from roller-wavs P, Fig. 9, shown as applied to the computing-machine described in Specification 26,858/10. Collars 244<C>, 244<D> prevent endlong movement of the platen; the collar 244<C> is provided with a milled head. (2) Within the platen 244, Figs. 1 and 4, is mounted a rockshaft 245 provided with one or more paperclips 246 projecting through slots in the platen to grip the end of the paper, which is then wound upon the platen. The shaft 245 is rocked by means of a hand-shaft 248<A> and projections 248, 247. Springs 249, 250 hold the shaft 245 in either extreme position. (3) Line-spacing feed-rollers 256, 257, Figs. 4 and 9, covered at intervals with sections of rubber tubing 256<A>, 257<A>, are mounted above the platen. The roller 256 is carried by arms 255, 255<A> on a 'rock-shaft 254, so that it can be moved away from the roller 257 for insertion of the paper. Spring-pressed pins 270, 270<A> hold the arms 255, 255<A> in either extreme position. The roller 257 is provided with milled heads 257<B>, 257<C> and a line-spacing ratchet-wheel 258. (4) In a modification shown in Fig. 6, the clips 246, Figs. 1 and 4, are replaced by rollers 542 disposed around the platen on spring - pressed linkage 540, 539, 538; paper-guides are formed by extensions 538<A> of the links 538 and by tongues 540<A> fastened to the links 540, the displaceable roller 256, Fig. 4, is replaced by a series of separate rubber-covered rollers 530<A>; and the rollers 530<A>, 542 are simultaneously operated from the rock-shaft 254, through spring-pressed arms 530, 535 loosely connected to the rock-shaft by pins and slots. Platen-roller detents and couplings.-(1) The neck of the milled head 244<C>, Fig. 1, is provided with a notch for engagement by a pivoted spring-pressed detent when it is desired to hold the platen stationary for insertion of the paper. (2) In the modification shown in Fig. 6, the end piece 241 is provided with a neck on which the milled head turns and is secured by means of screws working in a groove, and the reduced part of the head 528<A> is provided with a ratchet-wheel engaged by a spring-pressed pawl carried on the inside of the milled head. Carriage stops.-A fixed stop 275, Fig. 1, and an adjustable stop 276 are provided on the track 242 to limit the distance to which the paper-carriage can be pushed into the machine. Letter-spacing, line-spacing, and tabulating mechanism; carriage-releasing arrangements; space-key actions. -Variable escapement mechanism is provided to serve for tabulating, and a single space-key, in conjunction with a change - device, effects alternatively letterspacing and line-spacing. (1) A pin 272, Fig. 9, on the paper-carriage automatically engages a catch 288 on the drum-spring 287 as the carriage is inserted into the machine. When the carriage is withdrawn, the spring winds up until the catch 288 engages between a roller 283 and a forked plate 284, where it is retained in position for re-engagement when the carriage is again inserted. (2) The escapement comprises a rocker-frame 289, 290. 291, Fig. 9, a detent pawl 299, and a movable pawl in the form of a tooth on a slide 295. The amount of spacing is determined by the distance the slide 295 can travel before it abuts against the side 290 of the rocker-frame, and this distance is determined by an adjustable stop 311, against which the slide 295 is retracted by a spring 300 when released from the carriage-rack 243 on the return swing of the rocker-frame. (3) Line-spacing pawls 261, Fig. 4, co-operating with ratchetwheels 258 on the ends of the feed-roller 257, are carried by pivoted arms 260 connected at their lower ends by a cross-piece 259. (4) A release-key 301<A> Fig. 9, engages by its stem 301 against a tail-piece 299<A> of the detent pawl 299. (5) A plunger space-key engages by a rack with a toothed segment connected to a laterally-adjustable swinging rod provided with two pins projecting on opposite sides. A pushpiece provided with an indicator sets the swing- ing rod laterally so that the corresponding pin is in position for effecting line-spacing in any position of the carriage through connexions with the cross-piece 259, Fig. 4, or for effecting letter-spacing through connexions with an arm 292, Fig. 9, of the rocker-frame. (6) The adjustable stop 311, Fig. 9, is traversed by a worm 304 actuated by gearing 305, 306, the latter provided with a milled head 308 and an indicator in the form of a notched and numbered rim 307 engaged by a detent pawl 309; a stop prevents more than one revolution of the head 308. (7) To prevent a short or incomplete letter-space movement on operation of the space-key, an automatic lock is provided to hold the slide 295, Fig. 9, in engagement with the rack 243 until the slide 295 completes its travel to the side 290, and consists of a spring- pressed pin on the framing B adapted to snap into a notch in the rocker member 290 and to be freed by a second pin engaged by the slide 295 at the end of its travel. To prevent this locking when the paper-carriage is not in the machine, the locking-pin is held out of action by a spring-projected latch 333, which, when the paper-carriage is in the machine, is held depressed by engagement against a portion cf the face of the rack 243 left plain for this purpose.