Patent GB-189721854-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: MARKS GEORGE CROYDON
Filed: 1897-09-23
Granted: 1898-09-23
Abstract: 21,854. Marks, G. C., [Corre, A. G.]. Sept. 23. Type-writers.-Relates to improvements on the machine described in Specification No. 23,935, A.D. 1896. The type-bars a rest loosely on rods a<1>, a<2> of the cradle frame 28, and are hooked to the upper ends of levers 8, 9 pivoted in posts 10, 11 of the frame 28, and connected by rods 12, 13 to the key levers 1. The heads of the type-bars are guided to the printing-point by a converging guide 53, 53<1>, 53<11> carried by the cradle frame 28. This frame is pivoted at 45 and provided with arms or shift keys 35, 36. The shifting guiding-tongue 55 has openings for the rods a<1>, a<2>, and is formed of two sheets of metal, preferably of different thicknesses, so as to deaden the sound. The walls of the converging guide 53 are lined with thin sheet metal for the same purpose. The guiding-frame 53 is pivoted in the cradle frame on the ends of the rod a<1>, so that its nozzle may be depressed to expose the printing-point. The top plate of the guide 53 carries the guides for directing the ribbon over the printing-point. The posts 10, 11 are forced into holes in the cross-bar 15 of the cradle frame, and the bar 15 is connected by springs 25, 26 to tension - adjusting screws 27. The movement of the cradle frame is limited by discs 50 on screws depending from the arms 35, which discs engage the plate 48. The carriage frame 86 is bent from sheet metal, the platen K being journalled in the end brackets. One end of the platen shaft is in a slot bearing and held in position by a spring fork. The carriage runs on a roller frame 151. One set of pressure rollers 92 is mounted on arms o on a cross-rod p in the carriage frame, and another set 92<1> is carried by small frames q pivoted on a shaft carried by ears struck up from the paper shelf 96. The paper scale is carried by arms on the cross-rod p. The paper clips 91 are adjustably supported on the rear bar p' of the paper shelf. The line-space mechanism is substantially the same as in the machine referred to above, and the line space is regulated by a shield, pivoted on the platen shaft, which may be adjusted to prevent the pawl on the spacing- frame 105 from engaging the ratchet-wheel during part of its stroke. An extension 108 of the line-space frame 105 is engaged by the bell-crank lever 109 which is operated, as the carriage is returned for a fresh line, by a rod in the carriage striking an adjustable stop. The platen is held by a spring-pressed detent t having a roll engaging the ratchet teeth. The detent t is mounted on an adjustable stud so that it may be moved to adjust the flat surfaces on the platen to the faces of the type. The escapement pawls 131, 132 are operated by a wiper 135 connected to an arm 141 of the shaft 142 having an arm 142* connected to the universal bar 142<a>. The tension of the keys is varied by an adjustable spring arrangement connected to the wiper. A carriage-release key is provided which operates the wiper to disengage the pawls from the carriage rack, a yielding support being provided for the pawls to take up shock when the running carriage is arrested by the pawls. This yielding support has also an extension 131 in the path of stops adjustable with the paper clips on the rod p. The key levers are locked at the end of a line by an arm of the shaft 142 which is engaged by a weighted hook operated by a finger pivoted on the carriage. This finger also operates the bell hammer. The spring drum is connected to the carriage by a band having a loop at its end to engage a hook struck up from the carriage frame. The loop is secured to the band by a clip bent from sheet metal. The carriage-returning mechanism consists of the arms 121*, arm 120, bell-crank lever 119, link 122, and arm 115 depending from the carriage. The types pass through a wire shield 30 which keeps the ribbon off the platen. The springs c which lift the key levers are held by an inverted U -shaped bar 142<b> within which is another U-shaped bar 142<c>. The ribbon spools are of special construction, being framed by heads or flanges struck from sheet metal and secured to a sheet-metal sleeve. The key tops are of glass cast on to special clips f which are fixed on to the upturned ends of the key levers.