Patent GB-180352-A (GB)
Title: Improvements in typewriters
IPC: B41J1/04
Filed: 1920-11-25
Abstract: 180,352. Alexander, J. Nov. 25, 1920. Type-lever machines.-The framework consists of sheet-metal side plates 2 connected by back and front plates 4, 5 and a cross-bar 3, and provided with top plates 8, 10, the plates being connected on the inside by screws, and the joints being concealed by enamel &c. The key-levers are supported on a detachable plate 7 and engage a comb spring 11. Type-levers mounted on a segment 6 may be operated by the action described in Specification 180,615. Paper-carriages; platen-shift mechanism; shiftkey actions.-The platen frame 19 is guided vertically in a carriage 16 running on guide-rods 14, 15, and the shift mechanism engages a rod 63 secured to levers 65 on the carriage, the arrangement causing the carriage to be held down on the guide-rods when the shift mechanism is operated. Preferably, the carriage consists of side plates 16 connected by cross-bars 16a, 16<b> carrying a pair of rollers 15<a> and a single roller 18 running on the guide-rods 14, 15 respectively, the bar 16<b> also having a sleeve 17 running on the rail 14. The rollers are mounted on balls, and the rollers 15<a> are carried by adjustable pivoted arms 15<b>, Fig. 4. To permit detachment of the carriage, the rail 14 is carried by lugs 13<a> on a plate 13 detachably secured by screws 13<c>, Fig. 4, to the top plate 8. The platen frame, consisting of side plates 19, Fig. 17, connected by a cross-bar 19<a>, is guided vertically in the paper-carriage by engagement of the platen shaft 20<1> with slots 61, Fig. 11, in the side plates 16, and by engagement of the cross-bar 16<a> with slots 62, Fig. 17, in the side plates 19. The platen frame is retained in the carriage by means of pins 124, Fig. 17, which are secured to levers 123 on the side plates 19 and are normally beneath lugs 125 on the side plates 16. On rocking the levers, the platen frame can be detached. The levers 65 are pivoted on the side plates 16 and are formed with forks 64<1> engaging pins 65<1> on the side plates 19. The levers engage balancing-springs 66. The rod 63 engages a roller 73 connected to an arm 74 on a rock-shaft 69 which is provided with arms 70 engaging arms 71 on the shift-key levers 68, 67. Key locks.-The shift-key lever 67, Fig. 13, is provided with a pin 76 co-operating with a locking-hook 77, and the shift-key lever 68, Fig. 5, is provided with a pin 77<a> adapted, by engaging an arm 79 on the shaft 78 of the hook, to release the hook. To prevent operation of the hook, the shift-key lever 67 may carry a slide 67<a> which on being drawn forwards sets a lug 67<c> thereon in position for catching the hook and preventing the latter from co-operating with the pin 76. Paper feeding and guiding arrangements.-A rocking rod on the platen frame 19 carries paperfingers 24, Fig. 5, provided with feed-rollers. The fingers are provided with catches engaging teeth on the rod, and are formed with stops co-operating with margin mechanism. The rod is connected to a spring and carries a releasing-lever. Rear feed-rollers 27 are carried by a frame on a rock-shaft 28, connected to a spring and provided with a releasing-lever 29 which can be caught by a pin 30. Ink-ribbon mechanism.-The ink ribbon 36, Fig. 5, passes between spools 44 provided with ratchet-wheels 45 co-operating with yielding pawls 51 on bars 50 which are guided by pins 52 and are connected to fingers on a rock-shaft 46 provided with a finger 47 engaging a pin on a universal bail 38 operated by the type-levers. The feed is reversed or silenced by means of a manually-operated slide 57 provided with fingers 59 for engaging the pawls. The slide is formed with recesses co-operating with a spring detent. The spools are retained on the spool shafts by means of a pair of spring-urged arms 56, the lower arms engaging the shaft and upper arms engaging the spools. A vibrator 37 is mounted on an arm 41 which is connected by a link 42 to the universal bail. To compensate for platenshift, the arm 41 is pivoted on a yoke 75 secured to the rock-shaft 69 operated by the shift keys. Letter-spacing mechanism; space-key actions. -The type-levers operate a universal bail 38, Fig. 5, supported at the front by guide-pins, and at the rear by a lever 40 engaging a returning- spring 87. The lever 40 carries dogs co-operating with an escapement-wheel 85 which is coupled to a pinion 84 engaging a feed-rack 81 secured to a rock-shaft 82 on the paper-carriage 16. The space-bar levers 88 have pin-and-slot connection 94a with arms 90 on a sleeve 89 which is mounted on the shaft 78 and is provided with an arm 91 having a slot 91<a> engaging a hook on the universal bail. Tabulating-mechanism; carriage-releasing arrangements; carriage-brakes.-A tabulating-key lever 96, Fig. 11, engages an arm 99 on a rockshaft 97 mounted on the lugs 13<a> and provided with a finger 101 co-operating with tabulating- stops 98<a>, and a yoke 100 for lifting the feedrack 81. The stops are mounted on a bar 98 on the carriage. The yoke serves also as a carriagebrake, the pressure on the feed-rack being controlled by the tabulating-kev. The feed-rack can be lifted also by finger-levers 83 which are pivoted on the carriage and engage pins 82<x> on the rock-shaft 82. Alarms; line-locking devices; carriage-stops.- A bell-hammer 102, Fig. 4, is provided with a finger 104 in the path of a projection on the right-hand paper-finger. A line-locking lever, adapted to engage a lug on the universal bail is provided with a pivoted nose in the path of the projection. The lock can be released by pressing backwards the nose by means of a rock-shaft operated by a key-lever. A margin stop 141 on the rock-shaft 97 is formed with a finger adapted to engage the end of the carriage guide-sleeve 17. A margin-release key 143 on the carriage operates a lever 144 provided with a loose member 145 for engaging the finger on the margin stop; or, release may be effected by depressing the tabulating-key, described above. The final marginstop may consist of a projection formed on the left-hand paper-finger and adapted to engage a stationary stop.