Patent GB-191302124-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: PETERMANN OTTO
IPC: B41J35/00
Filed: 1913-01-27
Granted: 1914-01-27
Abstract: 2124. Petermann, O. Feb. 6, 1912, [Convention date]. Folding machines; inkribbon mechanism. - Relates to adjustable-throw vibrator arrangements particularly for folding machines, and comprises an horizontally-movable lever which is connected to the vibrator and is operated by a tappet on the universal bar mechanism. In the arrangement shown in Figs. 1 and 3, the vibrator consists of a bell-crank lever 36 pivoted at 37 to a bracket 34 on the carriage-bed 30 of a folding typewriter, the arm 42 of the vibrator being formed with an aperture 43 engaging a bell-crank lever 44, which is pivoted at 46 under the carriage-bed and is connected to a returning-spring 48. For operating the vibrator, the laterally-movable rod 26 of the universal bar mechanism is provided with a tappet 52 which can engage a lug 51 on the lever 44 and is directly adjustable by the finger. The tappet is pivoted at 53 to the rod and is formed with a finger-piece 54 and with arms 55, 56 which are of different lengths and are separated by a notch 57. When the arm 56 is set opposite the lug 51, the full throw is imparted and the bottom stripe of the ribbon is presented ; but when the arm 55 is set opposite the lug and a shorter throw is imparted owing to lost motion, the top stripe of the ribbon is presented. When the notch 57 is set opposite the lug, there is sufficient lost-motion to silence the vibrator, this adjustment being used for stencilling. The notch may be arranged to silence the vibrator completely or to cause the vibrator to make a stroke which is insufficient to carry the ribbon to the printing point. The arms 55, 56 of the tappet may be contiguous. In some cases, the tappet may be formed with a continuous curved or serrated surface for the purpose of adjusting the ribbon for maximum wear. The tappet is set by means of an indicator 65 arranged over the finger-piece 54 and secured to a bracket 63 on the rod 26. The indicator consists of a strip of paper or the like provided with red, black, and white marks to indicate the red, black and stencil adjustments, the strip being protected by a cover of mica or celluloid and being secured by folding over the edges of the bracket 63. The tappet is held in the set position by the engagement of the finger-piece 54 with a currugated spring-strip 61 secured to the rod 26 and arranged under the finger-piece. In the arrangement shown in Fig. 4, the tappet consists of a slide 66 which is mounted by a slot 67 and screws 68 on the rod 26 and is adjustable by means of a finger-lever 71 connected by a pin and slot 72 to an arm 70 on the slide. The slide is formed with a projection 76 adapted to engage a lever 78, which is pivoted at 79 under the carriage-bed, and is connected by a link 84 to the vibrator, a spring 82 normally holding toe lever against a stop 81. The throw can be adjusted by setting the projection 76 to engage different parts of the lever, the vibrator being silenced for stencilling when the projection is set opposite a notch 85 in the lever. Specification 1439/10 is referred to.