Patent GB-190401371-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: BROWN ALEXANDER TIMOTHY
Filed: 1904-01-19
Granted: 1904-02-25
Abstract: 1371. Brown, A. T. Jan. 19. Type-writers. - R e l a t e s particularly to the type actions of front strike or "visible" and other machines, the objects being to provide a compact arrangement of parts connecting the keys with the type-bars, certain of which parts may be assembled before they are placed in the machine, and to provide that there shall be no torsional strain, and that the extent of " dip" of the various keys shall be uniform. Means for operating the carriage by a step-by-step movement are however described. The type-bars 83, Fig. 1, are pivoted to hangers 85 having stems 142 secured in grooves formed in a vertical segment 3, and are operated through links 81, 71 and bell cranks 73 from the keys 98. The links 71 are provided with vertical projecting parts 78 which increase in height from the middle of the machine to the sides ; to these projections are connected the ends of the links 81 of the various type-bars 83. The ends 70 of the links 71 are supported by links 53 of uniform size and parallel with the arms 73<x> of the operating bell-crank levers 73. Each link 53 is pulled in the direction of the arrow by a liuk 67 and spring 65 hooked into it. The links 53, 71, bell-crank levers 73, and the key stems 128 may be assembled in a separate frame, composed of a series of parallel plates 107 bound together by bars 109 and intermediate bushes 108, and then placed in the machine, the ends of the bars 109 fitting into holes in the side frames of the machine. The key stems pass through guide-holes in the stepped plates 102 of the machine frame, bufferpieces contacting with the under surface of this plate. Each key is detachably connected with its stem by a pin fitting into the tubular upper part of the stem, a spline and groove preventing turning. A segmental padded support 155 is provided for the outer ends of the type-bars 83 when in the inoperative position. The segment 3 is composed of two sections 134, 135, Figs. 13 and 20, with slits 140 and grooves to receive the stems 142 of the hangers 85 and also with interlocking parts 136, 137, 138, and 139, the hangers being secured in position by screws 146. The links 53 are fulcrummed on knife-edges 55, Fig. 1, formed at the bottom of guide-slits 59 cut in a straight bar 56. The pull links 81 are each connected with corresponding vertical projection 78 by a piece 124 shaped as shown in Fig. 7, a turned-over bearing- piece 126 working in a bearing 79 having an opening 80 for removal of the piece 124 when the latter is turned into line with the projecting arm 78. The links 81 are screwed into the pieces 124 by which means any slack may be taken up. The arm 74 of each bell-crank lever 73 is bifurcated and fitted tightly on a flattened sleeve 86, Fig. 5, which turns on a rod 105 passing through holes 106 in the plates 107 and secured in position by its bent end 116, Fig. 14, engaging a removable locking strip 118. The front extremity of each arm 74 in one row works in the space between the bifurcated part of the corresponding arm in the row beneath it as shown in Fig. 8. The arms 73<x> are connected to their sleeves 86 at different points in the length of the latter to avoid interference of the links with each other. The carriage mechanism is operated by a coiled spring 13, Fig. 1, in conjunction with an escapement 20, 40, connected with the universal bar 51 which is actuated by the bent ends 52 of the links 53. The space-bar is shown at 127. A clutch 16 is disconnected by the push-rod operating through fingers 36, 35 a rocking bar 30, rod 27, and a yokepiece 23. The arrangement of parallel links 53, 73 may be actuated in any suitable manner to transmit movement to type-bars. Alternate typebars 83 are mounted a little to the right of the others in order that the types of one set may clear those of the other set.