Patent GB-190426804-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: JAMES REGINALD WILLIAM
Filed: 1904-12-08
Granted: 1905-01-12
Abstract: 26,804. James, R. W., [Union Typewriter Co.]. Dec. 8. Right to Patent relinquished. Type-writers. - Relates to the inking-mechanism of type-writers in which the ribbon is moved by a vibrator so as to cover and uncover the printing point at each depression of a key. The vibrator, may, if required, be fixed so that the ribbon is always over the printing point during the actuation of the machine. If a two-colour ribbon is used, the ribbon is vibrated at each impression when one colour is in use, and the vibrator is locked in its stationary position when the other colour is employed. The base 1 of the machine is provided with corner posts 2 surmounted by a top plate 3, supporting rails 4 on which the carriage 5 travels. The carriage is provided with a platen 6 and a feed-rack 7 gearing with a pinion 8 on a shaft which carries at the other end an escapement-wheel 11. This wheel is engaged by feed-dogs 13, 14 carried by an arm 15 mounted on a rock-shaft 16. Each key-lever 21 is connected by a link 26 with a bell-crank lever 28, one arm of which has teeth which gear with teeth formed on the end of the type-bar 33. Beneath the key-levers extends a universal bar 36, which is connected by links 37 to a bar 39 secured to an arm 40 projecting from the shaft 16. The end of the bar 39 has a vertical slot 42, open at the bottom, in which rests a pin 44 attached to a link 43, which is connected to one arm of a bell-crank lever 46 secured to a rockshaft 48. From the shaft 48 projects an arm 51 carrying a pin which rests in a slot at the lower end of a verticaly-movable ribbon-vibrator 54. This vibrator consists of a stem from which extends a yoke comprising two vertical arms which are slotted to receive the ink-ribbon 57. A push-rod 61, the motion of which is limited by stops placed on either side of a bearing 63, is adapted to bear against the vertical arm 47 of the bell-crank lever 46. When the push-rod 61 is in its outer position, the ribbon will be vibrated at each depression of a key. When the rod 61 is pushed in, the shaft 48 is rotated and the ribbon is raised so as to cover the printing point. At the same time, the pin 44 is moved down in the slot 42 so that the depression of a key no longer actuates the ribbon-vibrator. A spring 64 bears on the rod 61 and holds it in either position. When a two-colour ribbon is used, the upper half of which may be black and the lower half red, the vibrator normally moves so as to bring the black field over the printing point at each impression. When the rod 6t is pushed, in, the vibrator rises higher, so that the red field of the ribbon is brought over the printing point and there held. In Fig. 5 is shown a modification, some features of which are similar to; those described in Specification No. 19,605, A.D. 1900. Each key-lever 21 is pivoted . to a lever 69, the lower end of which is slotted to engage a fixed rod 71. The upper end of the lever 69 is connected by a link 73 to the type-bar 75. The type-bars are mounted in a segment 76 upon a pivot wire 77. Upon the rod 71. is pivoted a frame 78 carrying a roller 79 which acts as a universal bar. To the frame 78 is attached a link 80 which has a pin-and-slot. connection with an arm 83 projecting from the dog-rocker shaft 16. A spring 83<x> also connects the link 80 and arm 83. To the frame 78 is also connected a link 84, provided with a yoke 85 and having a pin at its upper end which engages a slot in a pivoted lever 95. The yoke 85 'engages an eccentric 86 on a shaft 87 which is connected by bevel-wheels with the spring drum 91.- A pin on the end of the lever 95 engages a vertical slot in the stem 100 of the ribbon-vibrator. An ear 104 on the ribbon-vibrator is adapted to be engaged by a cam 105, Fig. 7; carried by a push-rod 106. The rod 106 is carried by a bearing attached to a bar 109 which also supports the type-guide 111. Grooves in the sides of the guide 111 receive the arms 112 of the ribbon-vibrator, which has inclined openings 113 for the ribbon. When the ribbon-vibrator is required to remain at rest, the rod 106 is pushed along so that the cam 105 engages the ear 104. The vibrator is thereby lifted against the tension of a spring. 101,.and the pin at the end of the lever 95 moves idly in the slot in the stem of the vibrator. As thespring drum 91 rotates, the eccentric 86 moves the link 84 so as to vary the throw of the lever 95 in order that all parts of the width of the ink-ribbon may be used.