Patent GB-190913084-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: RONCHETTI JOSEPH ALBERT
IPC: B41J29/50
Filed: 1909-06-03
Granted: 1910-06-02
Abstract: 13,084. Ronchetti, J. A. June 5, 1908, [Convention date]. Line-locking devices of the kind in which the linelock lever swings on a vertical axis into locking position and may be released by a key which swings the lever on an horizontal axis. The line-lock lever 33, Figs. 1 and 2, is mounted on, and shrouded by, the usual central tie-rod 3, which braces the platen-frame 4 to the framework, a lever being journaled on trunnion-screws 38 carried by a head 37, which is formed on a shaft 34 journaled in the tie-rod and in a bearing 35. One end 40 of the lever may engage margin stops 26 behind the paper-carriage, and the other end 41 of the lever may engage in front of the paper-carriage with an arm 42 or other part of the universal-bar mechanism 8. When the right-hand margin stop engages the part 40, the lever 33 is swung on the pivots 38, and the part 41 engages the arm 42 and locks the universal bar 8. The release-key lever 45 engages directly with an arm 43 on the shaft 34 and when the release-key 46 is depressed the shaft 34 is turned and carries the part 40 out of engagement with the margin stop ; a spring then swings the lever on the pivots 38 and removes the part 40 from the path of the arm 42. In a modification, the lever 33 is mounted on the tie-rod 37 on stationary vertical trunnions, and is provided with a pivoted arm which corresponds to the part 40 and may be swung in a vertical plane by the release key. Carriage stops.-(1) The margin stops 26, Figs. 1 and 2, consist of a bevelled block formed with a tongue 25, which enters a longitudinal slot in a tube 24, the block being formed with teeth 27, which are held in engagement with the teeth of a rack 23 by the weight of the block and by a spring 28, which engages beneath the paper-apron 16. The block may be set by means of a handle 31, which is lifted to tilt the block clear of the rack 23 and is then moved along to bring the block to the new position. The stops are set by means of a scale 17 arranged on the back edge of the apron 16 and provided with legs 18 having stud-and-slot connexions with the apron to permit slight longitudinal adjustment of the scale. When the handle 31 is lifted, an index finger 32 on the handle is brought close to the edge of the scale. (2) The carriage is arrested silently at the end of the return movement by a spring buffer comprising a casing 62, Figs. 1 and 3, secured to the tie-rod 3 and provided with a spring plunger 63, arranged near the part 40 of the lever 33 and adapted to be pressed inwards when the left margin stop 26 engages the part 40. The plunger 63 is pressed outwards by a coiled spring 72 arranged between an adjusting-screw 70 and a metal washer 67, which is secured to the plunger by a pin 68 and is bedded on a washer 66 of soft or el stic material, the outward movement of the plunger being limited by a pin 64 and a slot 65 in the casing. The plunger may be pressed inwards until the spring is totally collapsed, the amount of movement however being less than the distance between the teeth of the carriage rack so as to ensure that an even margin is maintained.