GB182644A - Escapement mechanism and ribbon feed for typewriting machines - Google Patents

Abstract

182,644. Golby, F. W., (Federal Adding Machine Corporation). May 27, 1921. Letter spacing mechanism; space-key actions.-The spring- drum casing is secured beneath the top plate of the framework, and pivotally supports an escapement yoke or rocker which is pivoted on an axis intersecting that of the escapement-shaft; the yoke is operated by a reciprocating universal bar or independently by the space-key. The spring- drum casing 21, secured beneath the top plate 22, is formed with arms 36 provided with pivotscrews 37 for an escapement yoke 35, the axis of the pivots intersecting the shaft of the escapement-wheel 28 and feed-pinion 23. A reciprocating universal bar 13, suspended from links 14, is formed with forked arms 19 engaging pins 40 secured to arms 39 on the yoke. The universal bar is actuated by the type-levers 12 upon operation of the printing-keys, and upon release of the keys, the universal bar and yoke are returned by springs 18, 50. The space-key actuates the yoke independently of the universal bar by means of a rocking arm 54 which engages a finger 53 on the rocker. The yoke carries a fast dog 43 and a loose swinging dog 45 which co-operates with the escapement-wheel, the fast dog being secured to a lug 42, and the loose dog being mounted on a screw 46 and drawn towards a stop 44 by a spring 47. The escapement-wheel is loose on the shaft and carries a coupling-pawl 29 which engages a ratchet-wheel 31. Carriage-releasing arrangements and brakes.- The loose dog 45 is formed with a slot 49, Fig. 2, engaging the screw 46, and can be moved outwards to release the carriage by means of a lever 64 which is pivoted on the yoke 35 and engages a notch 65 in the dog, and an arm 69 connected to a releasing-bail 70. Upon release of the carriage, a brake shoe 75 is moved into engagement with a disc 27 on the escapement-wheel shaft, the shoe being carried by a bail 73. The bails 70, 73 mav be operated by the tabulating-stops 79. Ink-ribbon mechanism.-The escapement yoke 35 is connected directly to the ink-ribbon spools 93, preferably by means of arms 88 having pawls 91 engaging ratchet-wheels 92. The arms may be pivoted on screws 89 on the yoke, springs 90 permitting lateral movement of the arms in reversing the feed. The vibrator 96, Fig. 1, is connected to a lever 98 having a part 99 engaging the head 100 of an arm 101 on the universal bar 13. To adjust the vibrator when the platen is shifted, the lever-support 102 is adapted to be raised by the platen-shift mechanism, the part 99 sliding on the head 100 during the shift movement. The lever-support may be arranged to slide on a guide 103. The vibrator is not actuated' by the space-key.