Patent GB-190327156-A (GB)
Title: Improvements in or relating to Typewriting Machines.
Inventor: BOULT ALFRED JULIUS
Filed: 1903-12-11
Granted: 1904-01-14
Abstract: 27,156. Boult, A. J., [Smith & Bros. Typewriter Co., L. C.]. Dec. 11. Type - writers. - Relates to mechanism for operating the type-bars, for shifting the typebars to print upper and lower case, and for guiding the type to the printing point. The typebars 22, Fig. 4, are pivoted to hangers 24 which are removably secured to a segment 23. Each type-bar has a slot at its pivoted end to receive the bearing 26 of a hanger 24, a portion 28 of the metal forming a covering to prevent dirt and rubbings from the platen from falling into the bearing. Each type-bar has an ear 29 to which is pivoted an operating-link 30 by a universal joint consisting of a ballshaped pivot 32, Fig. 10, which is free to turn in the ear 29 and having pintles 33 which enter ears 31 on the link. A hardened steel ring 34 is connected to the type - bar by a rivet 35, and has a working fit in the bearing 26 of the hanger, or a hollow rivet may be passed through the bearing of the hanger and secured to the walls of the type-bar by setting up the ends. The hangers are secured to the segment by screws which pass through elongated holes in the hangers, so that the latter may be adjusted with reference to the printing point. The enlarged parts of the hangers are arranged zig-zag on the segment to take up less lateral space. The type-bars are operated by key levers 43 Fig. 4, provided with cam slots 46 which engage friction rollers 47 at the lower ends of sub-levers 45 which are pivoted at their upper ends to the links 30. The key levers have curved bearing- notches 49 which are held against a transverse bearing-bar 50 by springs 51. The upper ends of the springs are coiled upon screws having the same pitch as the springs, so that the tension of the latter may be adjusted by turning the screws. The key levers are guided by combs 54, 55. The segment 23 has supporting-legs 71 which are pivoted to arms 72 upon a rock-shaft 73, which has also at one end a spring arm carrying an antifriction roller 75. For temporarily raising the segment 23 when it is desired to write a single capital or figure, a key lever 76, Fig. 6, has a pin- and-slot connection 78 with an elbow-lever 79 having a cam-shaped end 80 which operates on the roller 75 to rock the shaft 73. For holding the segment in a raised position to write say a line of capitals, a key lever 77 has a pin-and-slot connection 81 with an elbow-lever 82 having in the end of its upright arm a circular notch 83 which, when the lever 77 is depressed, takes under and receives the roller 75. The elbow-lever 82 has a third arm 84 carrying a roller 85, which rises under the lever 76 when the segment is locked in its upper position. When the lever 76 is depressed, the roller 85 and its arm are forced down and the elbow-lever 82 is moved clear of the roller 75, allowing the segment to fall. The elbow-levers 79, 82 are mounted on a bracket 86 which is sustained from the main frame by screws 87. The screws 87 pass through hollow screws 88, threaded into the main frame, by which the height of the bracket may be adjusted. A bracket on each side of the machine carries an adjustable block in which is a V-shaped groove or ball-race carrying a ball which also runs in a race in a T-shaped block secured to the segment, so that the latter may rise and fall freely. The above-mentioned brackets also carry adjustable stops which limit the motion of the segment. Each type is directed to the printing-point by a guide 97, Fig. 4, which is carried by a slide having ball-races in its edges, and which runs on three balls 99, two on one side and one on the other. The slide is connected with the segment 23 by a link 102 and always moves with it. In modifications, the links 30 are connected to elbow-levers which are operated from the key levers by a link and a lever.