Patent GB-191424491-A (GB)
Title: Improvements in Ink-ribbon Mechanism for Typewriting Machines.
Inventor: JAMES REGINALD WILLIAM
IPC: B41J33/40
Filed: 1914-12-22
Granted: 1915-08-19
Abstract: 24,491. James, R. W., [Remington Typewriter Co.]. Dec. 22. Ink - ribbon mechanism. - The spools are associated with members, preferably the spool-shafts, which, on being shifted in one direction or the other, permit of detachment of the spools or reverse the feed. Reversing - mechanism acting independently of the members may also be provided. In the arrangement shown, moet of the parts of the mechanism are made from stampings. Feed and manual reversal; spool mountings. The mechanism associated with each spool is carried by a detachable bracket 22 formed with arms 34, 35, the spool shaft 33 being mounted in the arm 34 and in a sleeve 36, which is mounted in the arm 34. The spoul is formed with tongues 30 engaging grooves 31, 32 in the shaft, and a ratchet-whee] 49 is secured to a collar 51 having a pin 52 engaging the groove 31. A rocking frame, consisting of plates 53, 60 connected by pins 62, 63, 64, is mounted loosely on the shaft, the plate 53 engaging the arm 35, and the plate 60 engaging the collar 51 and preventing movement thereof when the shaft is shifted. The ratchet-wheel co-operates with a feed-pawl 88 which is pivoted at 91 to a lever 80, and with a detent 96 which is pivoted at 99 to the arm 34, a spring 95 tending to move the pawl and the detent towards the ratchet-wheel. The rocking frames are connected by a link 102, and on rocking the frames, the pins 64, 62 cause the pawl and detent of one spool to become disengaged and the pawl and detent of the other spool to become engaged, thereby reversing the feed. The rocking frames are connected by links 106 to levers 108, which are pivoted at 111 to the arms 34 and are formed with fingers 112 adapted to be engaged by the sleeves 36. The spool-shafts are moved outwards or inwards by means of cranks 48. On pulling outwards the shafts, the spools can be detached, and by pushing inwards the shaft of the empty or emptying spool to the position shown in Fig. 8, the levers 108 are rocked and the feed is reversed. Friction washers 111<a> hold the levers 108 in the set position. Forks 58, formed on plates 57 integral with the plates 53, prevent the spools from being moved inwards. Each spool shaft is surrounded by a spring 38 arranged to return the shaft to the normal position from either the outer or the inward position. In the normal position, flanges 37 on the sleeves 36 engage the arms 34. The spring is arranged between the sleeve 36 and a flange 39 on a loose collar 40, and the shaft is formed with a shoulder 41. which engages the flange 39 when the shaft is moved outwards, this movement being limited by the engagement of a shoulder 43 with the sleeve. The levers 80 of the feed-pawls are pivoted at 84 to the brackets 22, and are connected by links 78 to arms 75 on a rock-shaft 68 provided with arms 67 formed with lugs 69, to which the universal bar 65 is bolted. The arms 67, 75 are formed with apertures shaped to fit the flattened ends of hubs 72 secured to the shaft 68. Automatic reversal. The plates 60 of the rocking frames each carry a pawl 113, which co-operates with a toothed arm 86 formed on the lever 80 and with a cam 124 secured to a pin 120, which is mounted in the plates 53, 60 of the rocking frame and carries a feeler 118 adapted to drop into a recess in the core 24 of the spool. The feelers are pressed against the ribbon by springs 126<a> connected to the cams. When the ribbon is exhausted from either spool, the associated feeler drops into the slot and rocks the cam sufficiently to permit the pawl 113 to be moved by a spring 115 into engagement with the toothed arm 86. The operation of the keys then causes the pawl to be moved outwards, thereby rocking the frames 53 to reverse the feed, reversal being effected positively and without straining the ribbon. Reversal is effected even if both pawls 88 happen to be simultaneously in or out of engagement with the ratchet-wheels. Spools. The spools consist of heads 26, Fig. 8, connected by a core 24 formed with ribbonattaching tangs, and with tangs 25 which are passed through apertures in the heads. Guides. The ribbon passes, at each side of the top plate 3, Fig. 2. of the machine, over an inclined guide 15 formed at the front with ears 16. The guide is formed on a bracket 14 secured by screws 11 to a bracket 13, the screws passing through slots in the bracket 14, and the slots being open at the front to permit of ready detachment of bracket 14.