Patent GB-397854-A (GB)
Title: Improvements in and relating to billing-typewriters or like machines
IPC: B41J3/28
Filed: 1932-02-29
Abstract: 397,854. Typewriters &c. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.- (Elliott-Fisher Co. ; Cedar Street, Harrisburg, Pennsylvania, U.S.A.) Feb. 29, 1932, No. 6099. [Class 100 (iv).] Carriagereturning mechanisms; carriage brakes.-In machines comprising a type-carriage movable for letter-spacing on a carriage which is movable for line-spacing, a single control, for instance a pedal, is provided for causing power-devices, preferably pneumatic, to return the type-carriage and line-spacing carriage. A manually releasable brake tor the line-spacing carriage may be provided also with automatic releasing-means which are operated by the power-devices preparatory to return of the line-spacing carriage. The machine shown in Figs. 1 and 3 comprises a type-carriage 10 travelling for letter-spacing on a line-spacing carriage 13 which travels on rails 15 on the framework 16 of the platen 17. The linespacing carriage is provided with a brake consisting of a drum 24, Fig. 3, mounted on the shaft of the rear rollers and co-operating with a band which is normally locked by a spring- urged pawl 27 and is releasable by depress ng a key 29. For returning the line-spacing carriage, the machine is provided with pneumatic means comprising a cylinder 34 secured to the framework and provided with a piston 38, Fig. 5, having a rod 39 connected by a bar 72 to the line-spacing carriage. The connection consists of a sleeve 68 secured by nuts 71 to the bar and containing a spring 67 which abuts on the adjustable cap 70 of the sleeve and on the end of the rod. A casing 40 communicating with the cylinder is provided with a valve 44 which is movable inwards or outwards to connect the cylinder to an exhaust pipe 42b or a pressure pipe 42 leading to the casing. The valve is moved outwards by means of a pedal connected to a rock-shatt 49 having an arm 51 abutting on a collar 47 on the valve-rod 44. The pedal may consist of a bell-crank connected by a cable to an arm on the shaft 49. Manual means may replace the pedal. The valve is automatically moved inwards by means of a bell-crank 56 which abuts on an adjustable stop 63 on the valve-rod and has a roller 57 for engaging a cam on the line-spacing carriage. The bell-crank is pivoted on a sleeve 54 which is adjustable on a bar 52 on the framework and is retained by a catch 60. The piston-rod 39 abuts on a slide 76 co-operating with a bell-crank 80 connected to an arm 83 on the shaft 84 of the brake-locking pawl 27. To balance the thrust on the line-spacing carriage it is connected, on the opposite side to the cylinder 34, to the piston-rod of a cylinder 35 which communicates through a pipe 42d with the cylinder 34, the valve 44 serving to connect both cylinders to the pressure or exhaust pipe. For returning the type-carriage 10, a cylinder 88 secured to brackets 91 on the line-spacing carriage is provided with a piston 102, Fig. 12, having a rod 103 connected by a bar 104 to the type-carriage. A casing 93 communicating with the cylinder is provided with a valve 94 which is moved inwards or outwards to connect the cylinder to a pressure pipe 95 or an exhaust pipe 99. The valve is moved inwards by means of a bell-crank 135 which is mounted on the line-spacing carriage and abuts on a stop 132 on the valve-rod 108, a hooked link 130 connected to the bell-crank riding on a bail 137 connected to the shaft 49. The valve is automatically moved outwards by co-operation of a lug 118 on the bar 104 with an adjustable stop 121 on the valve-rod. Movement of the valve-rod is limited by co-operation of the stop with a loop on an arm 120 carried by a support 122 which is adjustable on a rack on the linespacing carriage. The stop consists of a head 121 threaded for adjustment in a sleeve 113 provided with a catch 112 for engaging teeth in the valve-rod. On depression of the pedal, the shaft 49 is rocked, the valves are moved to connect the cylinders to the pressure pipes, and the piston-rods are moved outwards to move rearwards the line-spacing carriage and return the type-carriage. During the initial movement of the piston-rod 39, the slide 76 is moved to release the brake-looking pawl 27, the spring 67 is compressed, and the slide then abuts on the front nut 71 and carries rearwards the bar 72. Pressure is cut off when the valves are moved by means of the stops 63, 121, adjustment thereof determining the movement of the carriages. When pressure is cut off, the spring 67 returns the slide 76, the brake-locking pawl is restored, and the linespacing carriage is held by the brake. For regulating the speed of the carriages, the pressure pipes 42, 95 are provided with throttle valves 43, 100 which are preferably so adjusted that the line-spacing carriage is moved more quickly than the type-carriage. The carriages start at a high speed and are subsequently slowed down by reduction of pressure due to the throttling effect of the valves.