Patent GB-956690-A (GB)
Title: Ribbon vibrator mechanism for typewriters
IPC: B41J33/20
Filed: 1961-09-26
Abstract: 956,690. Typewriters &c. SMITH-CORONA MARCHANT Inc. Sept. 26, 1961 [Dec. 6, 1960], No. 34402/61. Heading B6F. Vibrator mechanism; multiple ribbons.-By the means of selection push-buttons on the front of a typewriter the vibrator mechanism is arranged to either throw a carbon paper ribbon 210, Fig. 7, or the usual cloth ribbon 176, into the printing position. The push-button 26 to select the carbon paper ribbon is marked C, Fig. 2, this button has a stem 34 with lug 230 which pivots a lever 234 so a hooked vertical link 242 is brought into engagement with an actuator 126 which is operated upon every type-action. When the hooked link 242 is coupled to the actuator 126, link 260, Fig. 1, is operated and via parts 268, 272, 276, 278, the carbon paper ribbon guide 222, shifts the ribbon to printing position. The cloth ribbon is chosen by either of buttons 22, 20 marked R and B to represent the red and black ribbon areas. If no ribbon is required as in cutting stencils the button 5 is depressed. Vibrator mechanism; colour and stencil adjustment.-The buttons 20, 22, 24, Fig. 2, have stems 28, 30, 32 which engage cam surfaces on a slide 78 which is moved different amounts so that an extension 104 of the slide 78 moves a rod 112 and axially moves a roller 116 so it coacts with one of cams 118, 120, 122. Now, when the actuator 126 is operated by a type action, link 242 will not be engaged if carbon ribbon button 26 is not depressed, but according to which of the other three buttons is depressed, so the cams 118, 120, 122 will effect two degrees of movement or no movement to a link 144 connected at 146 to the frame 124 carrying the cams. Movement of link 144, Fig. 1, operates parts 150, 152, 154, 168 and the cloth ribbon guide 174 is moved into red or black position or not moved in the case of stencil cutting. A vibrator overthrow device, comprising an overthrow gate 190 with different surfaces 190, 190 for engagement by stems 28, 30 and link 200, Figs. 1 and 7, connected to the cloth ribbon guide operating mechanism 150, 152, ensures that the correct amount of throw occurs. Feeding mechanism for cloth ribbon.-This is conventional. Feeding mechanism for carbon paper ribbon.- This only operates if the hooked link 242 is in engagement with the type-operated actuator 126 and an extension 248, via crank 252, reciprocates a link 256, Fig. 1, to oscillate a spring clutch-one-way-drive to a shaft 318 driving a feed-roller 220. The amount of feed is adjustable by a stop 342, Fig. 10, mounted by a screw in an elongated aperture in a bracket 320. The stop 342 connects with the crank 252. A roller 218 is mounted on a pivotal bracket and is spring-urged against the feedroller 220. After passing through the vibrator guide 222 the carbon ribbon is taken up on a take-up spool frictionally driven by lug 400- 398. Spool and spool receptacles.-The take-up spool comprises a disc 350, Figs. 1, 14, and a hub 352 having a number of spaced fingers 354 to which the end of the ribbon may be attached. The casing 356 has a cut-out so the fingers have access to make the connections. The supply spool comprises a roll in an open top container 212 and rests on a curved finger 298, Fig. 10, to lift the roll on to an end 304 will pivot the finger 298 about pin 300. Ribbon tensioning and feed disabling.-The carbon ribbon from the supply spool, Fig. 10, is led over a sprung mounted roller 214 and over a sprung mounted roller 226, Fig. 14, on the take-up receptacle. If the ribbon should become jammed, breakage is avoided since the tensioning of the lever 384 by the pull on the roller 226 pivots a further lever 394. This has a link 382 connected to a cradle lever 378 which in such circumstances tips the spool out of the slot 374. The ribbon also passes over a pin 316, Fig. 1, on the bracket carrying the roller 218 so that when tension exists the roller is forced away from the feed-roller 220.