Patent GB-168166-A (GB)
Title: Improvements in margin controlling mechanism for typewriting machines
IPC: B41J29/46
Filed: 1920-06-02
Abstract: 168,166. James, R. W., (Remington Typewriter Co.). June 2, 1920, Line-locking devices; margin stops.-Relates to carriage-shift machines having a keyboard-locking device mounted on the main framework and controlled by stops on the carriage, and comprises the provision on the carriage of primary and final line-locking stops that are adjustable relatively and are adapted to co-operate with the locking-device in all shift positions of the carriage; margin and alarm mechanism, operative in all shift positions, is also described. The invention is shown in Fig. 1, a bottom plan, applied to the portable machine described in Specifications 159,705 and 168,135, Fig. 4, a rear view, and Figs. 5 and 12 show details. The locking-device consists of a plate 31, Figs. 1 and 12, which is pivoted by ears 33 to a shaft 35 on the main framework 2 and is formed with a flange 36 adapted, when the plate is rocked, to enter the path of lugs 30 on the key-levers 24. When the keys have uniform dip and are carried by keylevers of graded lengths, the lugs are caused to engage the flange after a uniform dip of the keys by arranging the lugs at graded heights, the lugs of the short key-levers being higher than those of the long key-levers. The plate is connected by a link 112 to a locking-lever or bell-crank 101 which is pivoted on a stud 102 secured to a bracket 103 on the stationary frame-member 4. The locking-lever 101 is formed with fingers 105, 106 for engaging in either the normal or shift position, relatively adjustable, primary, and final line-locking stops 80, 122 on the carriage 38. A yielding connection, arranged between the link 112 and the locking-lever, consists of a spring 117, Fig. 1, abutting on the tail 111 of the lever and the head 116 of a sleeve 113 which is threaded on the link and passes freely through the tail. The sleeve is secured bv a nut 115. The connection can be adjusted longitudinally, without altering the extension of the spring, to vary the initial position of the lever. If the locking-plate is obstructed, the locking-lever compresses the spring without operating the link, and, on removal of the obstruction, the spring is effective to operate the link. The front part of the link and a depending bend 112<a> therein are arranged and guided by adjacent key-levers 24. A margin stop 65 and a line-locking stop 66 carrying the stop 80 are carried by a rack 65 which is secured to rocking arms 56 on the end plates of the carriage 38, the arrangement permitting the rack to be raised by means of a finger-piece 64. A spring normally holds down the rack. The stops consist of a doubled blank having plates 68 for engaging the top and bottom of the rack, and a cross web or tooth 69 for engaging the rack teeth. The plates are connected also by rivets 70, 71, 72. The rivet 70 bears on the rack teeth as a fulcrum, and the tooth 69 is retained in engagement by means of a spring 73 which is coiled on the rivet 71 and abuts on the rack and a washer 74 on the rivet 72. The washer is knurled and is employed as a finger-piece for adjusting the stop. The margin and line-lock stops are provided at the bottom with stop lugs 78, 82 respectively for engaging a stop 84 on a bracket 85 secured to the carriage rails 41. The stop 80 consists of a depending pin 80 on the rivet 71. The return movement of the carriage is normally limited by the engagement of the stop lug 82 with the stop 84. For writing in the margin, the stop rack is raised by the finger 64 and the carriage can then be removed until a stop lug 125, Fig. 1, thereon engages the edge 126 of the bracket 85. During the letter-spacing movement, an incline on the stop lug 82 rides over the stop 84 and raises the stop rack. When the end of line is approached, the pin 80 on the stop 66 engages the finger 105 and turns the locking-lever, the locking-plate 31 being thereby rocked inwards to bring the flange 36 into the path of the lugs 30. Thereupon, the stop-lug 78 engages the stop 84 and arrests the carriage. The lock can be released by raising the stop-rack and thereby raising the pin 80 and permitting a spring 108 to return the locking- lever and the locking-plate to the normal position, the pin 80 and the stop-lug 78 then resting on the top of the finger 105 and the stop 84 respectively. Upon writing a few letters, the final line-locking stop 122 engages the finger 106, thereby causing the locking-lever to operate the locking-plate, and a stop 123 engages the edge 124 of the bracket 85 and arrests the carriage. The stops 122, 123 are formed on a plate 121 secured to the carriage. In returning the carriage, the pin 80 rides up on incline 107 on the finger 105, and an incline 79 on the stop 78 rides over the stop 82. Alarms.-A lever 87, pivoted at 88 to the bracket 85 on the carriage rails, is pivoted with a wire arm 95 carrying a bell hammer 98. The arm is coiled around a stud 94 on the lever and the end is inserted in a hole 96. When the end of a line is approached, the pin 80 on the linelock stop engages a pin 90 on the lever and rocks the lever, in opposition to a spring 92. When the pin 80 releases the pin 90, the lever is returned into contact with a stop, and the arm strikes the bell. The pin 80 rides over a bevel 91 on the pin 90 when the carriage is returned.