Patent GB-204347-A (GB)
Title: Improvements in typewriters
IPC: B41J3/00
Filed: 1922-03-24
Abstract: 204,347. Walton, T. March 24, 1922. Machines with types separate; machines for writing music. -In a typewriter suitable for printing letterpress or music, types are carried by a removable arcuate tray which is revoluble for type-selection and is associated with mechanism for removing the selected type and carrying it to the printing point. An arcuate tray 2. mounted on a carriage 2<a> running on rails 4, carries loose slippers 6 supporting types 5. Automatic or manual means are provided for locking the slippers or types when the tray is removed; preferably the tray is provided with spring locking-plates 7 normally engaging lugs on the slippers or types, pins 8 on the carriage releasing the plates when the tray is placed on the carriage. The tray is moved to the right or left for type-selction, by depressing one or other of a pair of members, preferably pedals, which are yieldingly connected to quadrants gearing with a bevelwheel 55 connected by an arm 53 to the tray, the bevel-wheel and arm being mounted on a post 54. The movement of the tray is limited by engagement of the arm 53 with one or other of a set of plunger-keys 49 adapted on being depressed to form stops for the arm. Specifications 179,210 and 182,145 are referred to. Keyboards.-The keys 49 are supported by plates 50, 51, the plate 50 being removable with the upper parts of the keys to permit change of keyboard. Hammer - impression arrangements. -The selected type 5 is removed from the tray 2 and swung upwards for impression on a platen 11 by means of a bar 62 adapted to enter the slipper 6 of the selected type and then swing upwards with the type and slipper. The bar is connected to a lever 67 and is mounted with longitudinal freedom on a second bar 63 having a catch 65 for gripping the slipper. On rocking the lever 67, the bar 62 moves into the slipper and operates the catch 65, whereupon a pin 68 on the bar 62 enters grooves 69 in a stationary member 70, and the bars swing upwards with the type and slipper. The lever 67 may be connected by a wire 66 to a pedal. Carriage-shift mechanism for writing music. The platen 11 is secured to a carriage 9 running on a slide 10 which can be moved vertically, to position the notes on the stave in printing music, by means of a setting-member movable on a dial and connected to the slide by means of gearing, linkage, or a cable. The connecting-means may be adjustable for different sizes of staves and types. As shown, the slide 10 is secured to plungers 82 passing through tubes 81 containing balancing-springs. A setting-lever 75, provided with a handle 76 having a spring catch, is secured to a shaft 73 geared to a cam 80 engaging a roller 84 on a bar 83 connecting the plungers. The setting-lever is formed with a pointer 77 arranged over a scale 78 which may be adjustable for transposing. Paper carriages and supports; sheet and web feeding and guiding arrangements.-The platen 11 is secured to the end plates 19, 20 of the carriage 9 and is provided with a facing secured to brackets 21 on the carriage. Webs or sheets are fed by means of upper and lower pairs of laterally adjustable feed-rollers 16 arranged adjacent to tables 14, 15 and provided with knobs 18, 17. Letter-spacing mechanism; space-key actions. -The carriage 9 is propelled by a spring drum 22 and is provided with a rack 27 gearing with a pinion 28 on the shaft 29 of an escapement wheel 33 co-operating with fast and loose dogs 34, 35 on a rocking beam 36. The beam is connected by chains 46, passing over pulleys 48, to levers 45 provided with space-bars 452 which are depressed to effect spacing. The loose dog 35 moves in a slotted guide 39 on the beam and normally is released from the escapement wheel and is held by a spring in engagement with a stop-arm 40 which can be adjusted to vary the spacing. The stop-arm is connected to an arm 41 having pin-and-slot engagement 412 with the arm 413 of an adjusting-lever 43 which is movable over a scale 42 and is provided with a catch. To permit carriage-shift, the pinion 28 is feathered on the shaft 29. The impression bar 62 may be arranged to operate the escapement on the return stroke. In a modification the dogs 34, 35 co-operate with two racks on the carriage, and the loose dog is adjusted by means of bevelgearing actuated by a knob. Carriage-returning mechanism.-The carriagechain may pass round a drum 31 on the shaft 29 to a second drum which can be turned by means of a handle to return the carriage and wind the spring-drum 22. Roller inking-arrangements.- The types are inked by means of a roller 58, which may be spring-pressed, mounted on a pillar 61 carried by a movable arm 57. To permit detachment of the type-tray 2, the roller-support 60 is revoluble on the pillar 61. A detachable slab 59 supplies ink to the roller.