Patent GB-244699-A (GB)
Title: Typewriting machines
IPC: B41J19/84
Filed: 1925-06-02
Abstract: 244,699. Remington Typewriter Co., (Assignees of Barney, E. E.). Dec. 22, 1924, [Convention date]. Line-spacing mechanism; locking-devices; carriage-releasing arrangements; paper-carriages; portable machines. - Typewriting-machines are provided with means for locking the line-spacing mechanism when the machine is made ready for transport; a collapsable part of the machine, for instance the platen finger-wheel, may be employed for controlling the locking-means and may be associated with carriage-releasing and carriage centre-lock devices; suitable line-spacing mechanism comprises a line-spacing lever of the second order pivoted at the bottom and having direct connection with a pawl-carrying lever of the first order pivoted on the axis of the platen. In the portable machine shown, the line-spacing lever 46 is normally unobstructed by the spindle 23 carrying the platen finger-wheel 71, but when the finger-wheel is moved to the full-line position shown in Fig. 1 to permit closing of the case b, the spindle protrudes and obstructs or locks the line-spacing lever when the latter has made a short ineffective movement. The spindle is mounted in bushings 22, 24 in the end plates 19, 20 of the carriage 7 and has a groove 26 engaging a feather 25. Longitudinal movement of the spindle is normally prevented by a finger 69 arranged in a slot 70 in the bushing 24 and formed on a lever 66 which is pivoted at 67 to the end plate 20 and is provided with a finger-piece 72. When the lever 66 is moved, the spindle can be moved longitudinally and a spring 73 causes the finger 69 to rest on the protruding end of the spindle. The spring 73 returns the lever 66 to normal position when the finger-wheel is pulled outwards. The lever 66 has a finger 74 for cooperating with a carriage centre-lock consisting of a notched stop 81 secured to a spring member 76, on the carriage-bed 3. The finger-piece 72 of the lever 66 engages a finger-lever 17a on a pivoted plate 12 carrying a feed-rack 11 co-operating with escapement dogs 9, 10. When the lever 66 is rocked to permit longitudinal movement of spindle 23, the finger 74 is set to co-operate with the centre-lock, and the carriage is released. The line-spacing lever 46 is pivoted at 47 to the end plate 20, and the finger-piece 48 extends above the platen 21 and is twisted out of the plane of the lever to facilitate operation. A pawl 35 cooperaing with a ratchet-wheel 31 on the platen is pivoted on a lever or plate 29 which is mounted on a ring secured to the bushing 24, and has a slot 50 engaging a pin 49 on the lever 46. The plate and lever are arranged on opposite sides of the end plate 20, the pin 49 passing through a slot in the end plate and a recess 66a in the lever 66. In operation, the line-spacing lever is pulled forwards and crosses the axis of the platen, the plate 29 being rocked and causing the pawl to turn the ratchet-wheel. Overthrow is prevented by engagement of a shoulder 38, Fig. 2, on the pawl with an inclined face 39 on the end plate 20. On releasing the line-spacing lever, the parts are returned to normal position by a spring 40 mounted on the end plate and abutting on a pin 43 on an arm 44 of the plate 29. Line-spacing is regulated by a shield 55 having a face 64 on which the end 37 of the pawl normally rests. The shield is mounted on a stud 54 on the end plate and is provided with a knob 52, a spring 53 abutting on the head of the stud being mounted in the knob. The shield is formed with semi-circular notches 56, 57 for engaging a pin 61 on the end plate, the pin having a semi-circular part 63 at the outer end so that on pulling outwards and then turning and releasing the knob, the shield can be adjusted and locked in adjusted position. Projections 59, 60 limit the movement of the shield.