Patent GB-190013729-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: JAMES REGINALD WILLIAM
Filed: 1900-07-31
Granted: 1900-11-17
Abstract: 13,729. James, R. W., [Union Typewriter Co.]. July 31. Type-writers.-Relates particularly to the inkribbon mechanism of visible-writing machines. Fig. 1 shows in sectional elevation a machine in which the types strike the upper front face of the platen 12, which is mounted in a carriage 8. 9,10 having rollers 11 running upon guide-rails 4 carried by parallel arms 5 pivoted to the framing at 3, 3. The arms 5 are rocked to shift the platen, for upper-case &c. work, by means of an arm 37, on one of the shafts 3, connected by a rod 38 to a shift key 39. On the carriage is a rack 14 engaging a broad pinion 15 on a shaft 16 carrying an escapement - -wheel 19 engaged by the dogs 21, 22 on a rocker arm 23 pivoted at 24. The arm 23 is rocked in one direction by a spring 25. and in the other by a rod 26 connected to an arm 27 of a universal bar 28 operated by the parts 31 of the key levers 32. The bar 28 is carried by arms 29 pivoted on the fulcrum shaft 30 of the key levers. The type-bars 98 are operated by eccentric toothed segments 104 on levers 102 connected by rods 105 to the key levers. The carriage is propelled by a spring drum. The ink ribbon 40 passes along the front side of the platen, and is wound on two spools 41, on shafts 65 mounted in standards one at each side of the machine. The ribbon passes through a guide 43, formed, as shown in Fig. 7, from two sheet-metal strips bent and clamped round two rods 44, 45, the projecting ends of which move in guide-slots formed by bending the projecting strips 47 of a plate or blank 49. The guide 47, 49 is loosely attached to the front carriage guide-rail 4 by screws 50 passed through the holes 51. A sleeve 52 fits looselv on the rod 44, and to it is attached a rod 54 pivoted to an arm 55 of a sleeve 56 loose on a shaft 57. An arm of the sleese 56 is connected by a rod 59 to a universal bar 60 carried by arms 61 pivoted at 62 and raised by springs 63. The depression of any key lever thus throws the guide 43 and ribbon upward and rearward on to the platen 12 over the printing-point. On each ofthe shafts 65 is a sleeve 74 forming one part of a ratchet clutch, and having a pin engaging a groove in the shaft so that it rotates with it, but can move longitudinally thereon. Below the parts 74 are sleeves 71 rotating loosely on the shafts 65 and having ratchet teeth co-operating with those on the parts 74. On the lower sleeves 71 are also formed pinions engaging rack teeth on sliding bars 85, one at each side of the machine. The bars 85 are constantly in gear with their pinions, and are moved longitudinally by a cam bar 97 on the carriage having an inclined edge engaging an arm 96 on a shaft 95, having arms 94 with pins 93 engaging pins projecting from the rack bars. The cam bars 97 preferably operate the bars 85 positively during the return movement of the carriage, springs moving the bars 85 in the opposite direction under the control of the cam bars. The sleeves 74 have discs or flanges 77 engaged by cams 80 on shafts 79 having arms 81 engaged by arms 83 fixed to the shaft 57, which is provided at each side of the machine with a milled head for turning it by hand. The cams 80 are oppositely disposed, so that, when one ratchet sleeve 74 is in engagement with the corresponding sleeve 71, the other is lifted out of engagement. The movement of the ribbon may be reversed by a partial turn of the shaft 57. As the carriage moves during printing the springs move the bars 85 step by step, and one of the spool shafts 65 is correspondingly rotated to wind the ribbon. In the return of the carriage, the engaged ratchet sleeve 71 slips over the teeth of the ratchet sleeve 74.