Patent GB-208106-A (GB)
IPC: B41J7/90
Filed: 1923-04-04
Abstract: 208,106. Polygraphische Ges. Dec. 11, 1922, [Convention date]. Type-bar machines; driving-mechanism.-A line-printing typewriter furnished with type-bars mounted in movable magazines, is provided with driving-mechanism for transferring the type-bars to and from printing position ; the driving-mechanism may be arranged also to actuate an aligning-device, an impression-platen, a line-justifying device, and roller inking-mechanism. In the machine shown in Fig. 13, the type-bars are mounted in vertically-movable magazines H12 each associated with a lifting-lever H11, and a pusher St7 for moving the selected type-bar on to a table S11. The levers H11 are connected to slides movable by means of a bar H8, and the pushers are connected to slides St13, Fig. 5a, movable by means of a bar St5, the slides moving differentially to positions determined by means of stops set for each line by the keys. The driving-mechanism comprises a wheel A<2> geared to a shaft X4 provided with a loose worm-wheel X3 engaging a worm X2 on a shaft driven continuously by a motor. An alternative handdrive, consisting of a crank A3 geared to the shaft X4 is also provided. A coupling X13, Fig. 2a, for the worm-wheel is engaged by rocking a handlever X5, and is retained by means of a hook X11 adapted to catch a pin X12 on the coupling-fork X8. After setting a line, the hand-lever X5 is rocked, and when the wheel A2 has made one revolution, the hook is raised to release the coupling, by means of a rod X15 which is moved longitudinally by a projection X14 on the wheel. The. coupling can be released manually by means of a hand-lever Y1 operating a link Y6 connected to the hook. The bar H8 for moving the lifting- levers H11 is connected by links H7, levers H5 and a link H4 to a crank H3 on a mutilated pinion H2 movable into and out of engagement with the wheel A2 by means of a lever HI operated by a cam-groove A6 in the wheel. When the lever rocks, a toothed part of the pinion engages the wheel, and the crank is effective to raise the magazines. On return of the bar H8, the magazines are held in the raised position by means of a laterally-movable comb or rack H17 operated by a link H15, connected to a lever H14 which is rocked by means of an arm H13 on the pinion H2. The lever H14 when rocked is retained by a lever H18 which is released when the wheel A2 has almost completed a revolution by means of a lever H20 operated by a projection A7 on the wheel. The bar St5 for moving the pushers St7 is connected by links St4 to a crank St3 on a mutilated pinion St2 which is movable into and out of engagement with the wheel A2 by means of a lever St1 engaging the cam-groove A6. After operation of the aligning, justifying, impression, and inking-mechanisms described below, the type-bars and spaces are returned to the magazines by means of a sliding- plate N8 geared to a rack N3 which is connected by a link N2 to a lever N1 operated by the projection A7. The plate is adjustable in length, and is formed with teeth for engaging the typebars and spaces. Aligning for impression.-The type-bar pushers St7, Fig. 13, are formed with teeth St12 which, when the pushers have been moved outwards, are engaged momentarily by a toothed plate St11 connected by a link St10 to a lever St9 operated by an arm St8 on the pinion St2. The type-bars V4, Fig. 8<a>, are formed with teeth for engaging toothed aligning-bars V3 which are depressed in opposition to springs, by means of links V2 engaging inclines V1 on racks S1 operated by the projection A7 on the wheel A2. The racks S1 and the parts operated thereby are returned to normal position by means of a rack S10 which is geared to the rack S1 and is moved downwards by the projection A7. The bars V3 are detachable. Letter-spacing mechanism.-The type-bars are separated by spring spaces and are clamped to justify the line by means of two clamping-plates S12, Fig. 6<c>, connected to racks S6, S8 respectively, the racks being geared by means of a pinion S7, and the rack S6 being connected by a link S5 to a crank S4. The crank-shaft S3 is geared to the rack S1 referred to above. The clamping- plates co-operate with the stepped plates de. scribed in Specification 201,516. Platen-impression arrangements; pedal attachments.-A rocking platen-roller D7, Fig. 13, is carried by levers D6 connected by a link D5 to a lever D4 in the path of a projection D3 on a mutilated pinion D2 which is moved into and out of engagement with the wheel A2 by means of a lever D1 engaging the cam-groove A6. To prevent impression, the stroke of the platen roller can be reduced by raising the pivot D13 of the lever D4. For this purpose, the pivot is mounted eccentrically in a sleeve which can be rocked, preferably by means of a pedal. The platen roller is provided with line-spacing mechanism. Roller inking-arrangements.-The type-bars V4, Fig. 8<a>, are inked before impression by means of inking-rollers F12 mounted on a traversing-carriage F11 running on a rod F20, Fig. 8<a>. The carriage can rock on the rod, and is provided with a roller F21 co-operating with a cam-groove in a bar F22 to press the inking- rollers into contact with the type-bars, and an ink-distributing drum. The carriage is connected by a chain F9, passing over rollers F10, to pulleys F8 geared to a sector F6 on a lever F4. The lever is operated by a cam-groove F3 in a disc F1 connected to the pinion D2 operating the platen roller. The inking-rollers pass, at one end of the traverse, on to the ink-distributing drum, to which ink is transferred from a duct F24 bv means of rollers F15 - - F17. The ink-distributing devices are connected by a belt F23 to the driving-motor. The inking-rollers are adjustable by means of screws F13. Lithographic or like ink may be employed.