Patent GB-189706162-A (GB)
Title: Improvements in Type-writing Machines.
Inventor: FAY CHARLES NORMAN
Filed: 1897-03-09
Granted: 1897-05-01
Abstract: 6162. ray, C. N. March 9 Type-writers.-The first part o f t h e invention relates to the carriage and its supports and the feed-mechanism. It i s shown in Fig. 2. On the top plate are mounted bars 2, 3 grooved for sets of rollers 5, 5<a>, on which the grooved rear and front bars 7 and 9 of the carriage frame run. The carriage frame is held down by the bars 8, 10. The bars 2, 3 are fixed to the framing by screws, so that they and the carriage can be removed readily. The rear rollers 5 fit the grooves in the bars 2 and 7, but the rollers 5<a> have play to prevent binding. On the front bar of the carriage there is a bell and a margin stop which engage an adjustable stop on the bar 10. Another adjustable-margin stop 24 is placed at the other end of the bar 10. On the end bars 12 of the carriage frame are brackets 30, in which are pivoted the trunnions 32 of the platen frame 33. The platen frame is provided with a handle by which it may be tilted to throw up the platen and show the line of writing. Pressure rollers 45, 46 are carried by arms pivoted on the front bar 34 of the platen frame. These arms are pressed by springs to press the rollers on the platen, and are adjustable along the bar 34. Guide-plates or springs extend under the platen from the lower roller arms. A paper table 60 is pivoted on the shaft 61, and is pressed towards the platen by springs. In the table 60 are openings through which project pressure rolls 65 on arms pressed toward the platen by springs on the shaft 61. To the shaft 61 is fixed an arm 70 on which is a roller 71 engaging the end bar 12, and when the platen frame is tilted up this arm moves and reduces the pressure of the rollers 65 against the platen. On the shaft w of the platen is a toothed wheel w<3> engaged by the tooth 80 of a pawl 81 pivoted at 82 to an arm 83 of a lever 85. The heel 86 of the pawl bears against the ratchet-wheel at the end of the movement to prevent overthrow of the platen. The movement of the arm 83 is limited by an adjustable stepped stop X. The wheel w<3> is engaged by a check or detent consisting of a block pivoted in a spring-pressed arm on the shaft 61. One side of this block is toothed or serrated to engage the wheel teeth and the other is smooth, and either side may be turned to engage the wheel. The carriage feed is regulated by a rack 96 pivoted on the carriage and engaging multiple-toothed pawls 98, 99 on a rocking frame 100, 101, pivoted at 103, and operated by a rod 116, &c. The pawls 98, 99 are set one a half tooth in advance of the other. The rack 96 may be tilted to disengage it from the pawls by an arm 120 thereon engaged by a rod 121 operated by an arm 122 and a handle in proximity to the lever 85. The second part of the invention relates to the ribbon-feed arrangement, which is represented in plan view in Fig. 21. The ribbon-spool shafts D, F are both geared to a shaft B operated from the carriage spring drum C. The shafts D and F are removably mounted at one end in pivoted brackets E fixed by screws E<1>. Each shaft is provided with two or more sets or rings of ratchets d<1>, f<1> alternating with plain spaces d<2>, f<2>. Each spool G, G<1> has a pivoted pawl g adapted to engage the teeth d', f<1>, and the teeth are so arranged that as the spools are moved together along their shafts the pawl of one spool engages one of the rows of teeth, while that of the other spool rests on a smooth part of the shaft. The spools are moved transversely by arms R extending upwardly from sliding bars P in brackets k<1>. The ends of the bars P have rack teeth engaged by pinions on a shaft M provided with an operating-wheel m, and with means for holding it in the position into which it is turned by the operator. To the upper ends of the wires R is attached a ribbon guide-plate I having a raised centre t<1> with an opening t through which the types strike the ribbon H on to the paper. The third part of the invention relates to the type-bar, which is made from a blank of sheet metal bent at the centre to form the sides A', Fig. 27, and a socket a<20> for the type. Trunnions a<10> are pressed out from the sheet metal to form pivots for the type-bar, and wear is taken up by a screw c<5> passing through a nut B<2>. The head of the screw engages the sides of the bar and opens them as required. A special arrangement of nut for the screw c<5> is described.