GB191515393A - Automatic Ribbon Reverse for Typewriters. - Google Patents

Abstract

15,393. Sholes, Z. G. Nov. 1. Ink-ribbon mechanism -Relates to automatic reversal mechanism in which (1) the spool shafts 13, 14 are connected by bevel-gearing 15, 16 to shafts 31, 32 provided with bevelwheels 35, 36, one of which gears with a bevel-wheel 37 or 38 on a longitudinally movable shaft 17 geared to the spring drum 20, and (2) the longitudinal movements of the shaft 17 are effected by the engagement of ribbon-controlled means with worms 47, 48 on the shaft, a locking-device being provided for retaining the shaft in the set position. According to the invention, levers 51 are arranged so that one end engages the ribbon on the spool, and the other end can engage the associated worm 47 or 48 and release a shaft-locking device such as a pivoted catch 40 or 41. Each lever is pivoted at 49 and formed with an horizontal arm, which is guided at the end by a member, 52 and is formed with a worm-engaging tooth 53 and a projection 54 for actuating the catch 40 or 41. A vertical arm 50 on the lever passes into the core 55 of the spool and is provided with a roller 57, which intermittently engages the coiled ribbon 10 through a slot 56 in the core. When the ribbon has been wound off either spool, for example the spool 12, the lever 51 can drop, the tooth 53 engaging the worm 48 and the projection 54 lifting the catch 41 out of a groove 46 in the shaft. The worm 48 then causes the shaft to move to the right until the bevel-wheels 38, 36 are in mesh and the catch 40 drops into the groove 46. A bevel-wheel 18, gearing with a bevel-wheel 19 on the spring drum, is secured to a sleeve 23 which is loose on the shaft 17 and is provided with a pin 28 engaging a lug 30 on the shaft, longitudinal movement of the wheel 18 being prevented by the engagement of a slotted bracket 25 with a collar 24 on the sleeve 23.