Patent GB-235025-A (GB)
Title: Improvements in folding typewriting-machines
IPC: B41J3/37
Filed: 1924-07-14
Abstract: 235,025. Rogers, F. H., (Woodstock Typewriter Co.). July 14, 1924. Folding machines. - In machines having a folding frame supporting the paper-carriage, a rock-shaft mounted in the main framework cooperates, when the folding frame is in normal position, with letter-spacing, line-locking, inkribbon or other mechanisms mounted on the folding-frame. The letter-spacing mechanism may, as described below, be associated with backspacing and tabulating-mechanisms, and the carriage may be provided with a centring-lock and a detachable platen. The rock-shaft 36, Fig. 1, mounted in the framework 28, is operated as described below bv a universal bail 84 in the path of type-levers 42, and is provided with arms for co-operating with letter-spacing, line-locking, and ink-ribbon mechanisms mounted on a folding frame consisting of bars 32 supporting the carriage bed 34, the mechanisms automatically engaging the arms on the rock-shaft when the folding frame is turned into working position. Type-lever actions. - Key-levers 38, Fig. 1, have pins 48 engaging slots 47 in sub-levers 44 connected by links 46 to type-levers 42 pivoted on a segment 43. The arms 45 of the set of sub-levers are graded in length and the pins 48 are arranged in different positions to provide for uniform dip of the keys. Case-shift mechanism; shift-key actions.-The segment 43 is supported at each side by pivoted arms 49, 50, Fig. 3, and is normally held in elevated position by springs 56 adjustably connected at the top to notched fingers 58. Shiftkey levers 63 for depressing the segment are provided with adjustable arms 66 having pin-andslot engagement 68 with levers 69 engaging plates 61 secured to a rock-shaft 54 carrying the arms 50. Stop-screws 60, 72 engage the plates to determine the normal and shift positions of the segment. Shift-key locks.-The left-hand shift-key lever 63 is provided with a pivoted locking-key having a lug for engaging beneath an adjustable stop when the locking-key is depressed. Paper carriages and supports.-(1) The carriage 102, Fig. 1, is locked in the central position, preparatory to folding over the arms 32, by means of a catch which is pivoted on one of the arms and has a hook normally co-operating with a pin on the framework to hold down the arms. When the carriage is in the central position, the catch can be turned to release the hook from the pin, and a lug on the catch can lock the carriage by entering a notch therein. When the carriage is not in the central position, the carriage obstructs the lug and prevents release of the hook from the pin. (2) The platen shaft 199, Fig. 1, is retained in notches in the platen frame by means of pivoted catches. Letter-spacing mechanism. - A universal bail 84, Fig. 1, in the path of the type-levers is secured to arms 85 pivoted to arms 87 on the segment-shift shaft 54, the pivoted connections 86 being in alignment with the pivotal connections 57, Fig. 3, of the arms 50 and the segment. In either position of the segment, a finger 89 on the universal bail engages a roller 90 on an arm 91 secured to the rock-shaft 36. A returning-spring 93 is connected to a finger 92 on the rock-shaft. An arm 134, Fig. 11, on the rockshaft operates a rocker 120 which is pivoted on the carriage-bed and is provided with fast and loose dogs 123, 124, co-operating with an escapement wheel 119 mounted on the carriage bed and provided with a pinion engaging a feed-rack on the carriage 102. The loose dog can slide for letter-spacing or rock for carriage-release, and is normally held by a spring 126 in contact with a stop 127 on a plate secured to the rocker. Space-key actions.-The spacing-bar 100, Fig. 1, is secured to arms 99 on a shaft 98 having an arm 97 operating a slide 95 which engages the above-mentioned finger 92 on the rock-shaft 36. Back-spacing mechanism.-A slotted arm 146, Fig. 11, engaging a pin in alignment with the escapement-wheel shaft 111 is connected by a link 144 to a bell-crank 139 in the path of an arm on the back-spacing key-lever. The pivot of the link 144 and arm 146 is formed with a pin 145 adapted on depressing the back-spacing key to engage and then rotate the escapementwheel 119, the movement being limited by a stop 150 in the path of a lug 151 on the arm 146. The link 144 is connected to a returning- spring, and is provided with a projection 153 which normally abuts on the arm 146. The backspacing mechanism is mounted on the main framework, and when the folding carriage is moved into working position, the escapementwheel comes into position for co-operating with the pin 145. Tabulating - mechanism; carriage - releasing arrangements.-The tabulating-key lever is connected to a vertical lever abutting on a horizontal lever 184, Fig. 11, connected by a link 185 to a cam-lever 188 engaging a pivoted dog 191. The members 184, 185 are mounted on the carriage bed. On depressing the tabulating-key, the dog is rocked rearwards into the path of tabulating- stops on the carriage. On releasing the tabulating-key, the dog is restored to normal position by a spring 192. The loose escapement dog 124 is moved out of engagement with the escapement wheel for carriage-release, by means of a shoulder 196 on the link 185. Alarms; line-locking devices; margin stops.- Line-locking and margin stops are carried by a pivoted stop-frame on the carriage. The linelocking stop actuates a spring-urged bell-hammer 162, Fig. 11, and then by rocking a lever 166, causes a finger 173 on a lever 171 to move into the path of an arm 174 on the rock-shaft 36, thereby locking the universal bail 84 and preventing the type-levers from striking the platen. To release the lock, the stop-frame is rocked to move the line-locking stop out of engagement with the co-operating lug 165 on the lever 166. The margin stop limits the movement of the carriage to the right by engaging the lug, and margin release is effected by rocking the stopframe. The levers 166, 171 are mounted on the carriage-bed 34, Fig. 1. Ink-ribbon mechanism.-(1) Feed and reversal. The rock-shaft 36, Fig. 11, is provided at each end with an arm 278 having a flange for retracting a lever 270 carrying a feed-pawl 268 cooperating with a ratchet-wheel 253 on the spindle 252, Fig. 9, of the associated spool. The spindles are mounted in lugs on the arms 32, Fig. 1. Each pawl is associated with a detent 268 formed with ears pivoted on the arms 32, the tails of the pawl and detent being connected by a spring 277. The levers 270 are pivoted on a slide 272 which is mounted in the arms 32 and is movable manually or automatically to reverse the feed by moving one pawl and detent into, and the other pawl and detent out of engagement with the associated ratchet-wheel. For automatic reversal, each spool is equipped with a pivoted feeler 255, Fig. 9, carried by a pivoted yoke 258 engaging a pin 263 on a sliding rod 262 in the spoolspindle 252. The sliding rod is provided with flanges 290 engaging one end of a lever 285 universally supported by a T-head 286, the other end of the lever having a roller 289 co-operating with an incline 291 on the arm 278. A slot 293 in the lever engages a finger 292 on the slide 272. When the ribbon has been wound off either spool, the feeler 255 of the empty spool is released and permits the spindle 252 to drop, the roller 289 being thereby raised into the path of the incline 291; at the next operation of the rockshaft, the lever 285 is rocked and moves the slide 272, thereby reversing the feed. For retaining the feeler 255 in the position shown in Fig. 9 when the spool is removed, the spindle 252 is provided with a spring 257 which engages a finger 256 on the yoke 258 when the spool is removed. (2) Vibrator mechanism. A bell-crank 303, Fig. 11, pivoted at 304 to the carriage-bed 34 and connected to a vertically movable vibrator 294, Fig. 1, is provided with an actuating-member 308 which is adjustable to place a lug 311 thereon in the path of either of two fingers 312, 313 on the rock-shaft 36 for the purpose of adjusting the throw of the vibrator. Stops 315 co-operate with a nose 314 to limit the movement of the member. To silence the vibrator for stencilling, the lug 311 is placed between the fingers 312, 313. The member 308 is formed with a slot 310 engaging an enlargement on the pivot, and is provided with a pin 307 engaging a slot 306 in the bell-crank 303. The member 308 is connected by a link 309, bell-crank 316, and a link 319 to a sliding finger-piece which is moved backwards or forwards to adjust the throw of the vibrator. The finger-piece is retained by a spring-detent engaging notches therein.