Patent GB-191013910-A (GB)
Title: Improved Electrically Operated Carriage Return and Line Spacing Mechanism for Typewriters and the like.
Inventor: BELLE CHARLES SUMNER DE
IPC: B41J3/44
Filed: 1910-06-08
Granted: 1911-06-01
Abstract: 13,910. Du Belle, C. S. June 8, 1909, [Convention date]. Electric carriage-returning mechanism; linespacing mechanism. - Relates to electric carriage-returning mechanism of the kind described in Specification 12,915/08, wherein the carriage is connected to the core of a solenoid, which is energized when the carriage-return key is operated, the line-spacing mechanism being operated automatically during the return movement. (1) The core D of the solenoid A is formed with a rack G, which gears with a pinion I<2> on a shaft I which is connected to the carriage by means of a pinion I<1>, Fig. 1, engaging a rack H on the carriage; or, as shown in Fig. 9, the shaft I may carry a wheel N provided with steel bands n, n<1>, which are secured by adjusting-screws 0 to brackets P on the carriage. The core D is formed with a pistonhead fitting a long tube C which constitutes a pneumatic dash-pot for cushioning the core towards the end of its inward movement, the air expelled being used for cooling the solenoid. The tube C is mounted in a sleeve B, and is formed with apertures c<Î> leading to an annular space between the tube and the sleeve. The tube is closed by a screw-plug C<1>, which is provided with an adjustable air-screw c<1>, Fig. 6, having a groove c<2> leading into the tube, the screw being provided with a lock-nut C<2> formed over a groove c<3> and leads into the groove c<2>. In a modification, the air-screw is arranged to uncover the end of an inclined passage which leads out of the plug. When the carriage is spaced forward, the core D is drawn out by the gearing I, the air in front of the core being expelled through apertures . c<5> and through a slot provided for the pinion I<2>. When the carriage-return key M is operated, the solenoid is energized and the core is drawn in and the carriage is returned, the core being cushioned so that the carriage is arrested without shock by the margin-stop. During the first part of the inward movement of the core, air is expelled through the apertures c<Î> and passes round the solenoid which is thereby cooled, the air passing out through apertures x<1> in the casing E, a further series of apertures being provided along the casing. When the head of the core has passed the last of the perforations c<Î>, air can escape only through the plug C<1>, so that the core is drawn in rapidly for part of the travel, and is then cushioned, the speed of return being regulated by means of the air-screw. The carriage-return key M operates a switch L which is connected bv leads K<1> to the terminals k, k<3> of the solenoid, the terminals being connected by leads K to a wall-plug. In a modified arrangement of the electrical connexions, the terminals of the solenoid are arranged inside a rubber box which carries externally the terminals for the leads K, K<1>. The apparatus may be built into the machine, or, as shown, may be secured to standard forms of typewriters by means of brackets such as F, F<1>, which are adapted to be secured to the framework by screws entering existing screw-holes in the machine. (2) The usual carriage - return and line-spacing lever is replaced by a lever T, which is adapted to engage a fixed abutment u near the end of the return movement of the carriage. The lever T is connected to a bell-crank lever S, which engages the usual slide for operating the line-space pawl. The modified parts are carried by plates R, Q which are secured by screws entering the usual screw-holes. The abutment u preferably consists of a roller carried by a projecting part of a bracket U which is secured to a frame-rod. The lever T is held in position to engage the abutment u by means of a light spring, which yields to permit the lever to ride over the abutment when the carriage is moved to the left.