Patent GB-189921504-A (GB)
Title: Improvements in Type-writers.
Inventor: SOBLIK MAXIMILIAN
Filed: 1899-10-27
Granted: 1900-09-29
Abstract: 21,504. Soblik, M. Oct. 27. Type-writers. - Relates to machines in which the keys are fixed and are provided with perforati ons through which compressed air continually ssues. When the finger is placed on a key, the increased pressure produced causes the positioning and striking of the type-wheel. Fig. 1 shows a sectional elevation and Fig. 3 a sectional plan of t he machine, which comprises an annular casing 1 provided with annular channels 2 and 3, of which the former is supplied with compressed air through a pipe 4. Between the channels are holes 5 in which are small pistons 10. A port 6 admits air beneath each piston 10, but the pressure is not sufficient to raise the piston as long as the air is free to escape through the key 9. When such escape is prevented the piston rises, its upper end 12 forming a stop in the path of an arm 28 splined to the vertical shaft 27, which drives the type-wheel 31 through a universal joint 29. A port 7 now admits air to the annular channel 3, and the piston 15 is forced outwards so as to actuate the lever 17 and catch 16 and release the arm 18 carried by the rotary portion 21 of an air-driven motor 19. The motor is driven by the action of compressed air entering the annular chamber 19<a> through a port 23 and acting upon sliding wings 25 carried by the rotary part 21. The exhaust air leaves the motor by a port 24. When the motor is thus set in motion, the shaft 27 is rotated until the arm 28 is arrested by the projected stop 12. The inertia of a fork 51 loosely pivoted on the shaft 27 causes a valve 50 to connect momentarily au air-supply pipe 47 with a pipe 43, and so admit air to a cylinder the piston of which causes the type-wheel to be thrown over against the platen. The movement of the rock-shaft which supports the type-wheel actuates a valve which opens the exhaust of the aforesaid cylinder, so that the typewheel immediately returns from the impression-point under the influence of a controlling-spring connected with the rock-shaft. The escapement mechanism for the carriage-feed consists of an escapement-wheel 88 controlled by a pallet-plate 87 actuated by the type-wheel rock-shaft. The carriage rack 84 gears with a pinion 85 connected with the escapement-wheel through a ratchet-wheel and pawl so as to enable the carriage to be returned at the end of each line. The carriage is fed forward by the action of compressed air on a piston moving in a long cylinder, and the carriage is returned by means of a second cylinder to which the compressed air can be diverted by means of a special key. To move the carriage forward freely, a key is provided which brings into action a cylinder serving to release the escapement-wheel from the pallet-plate. The platen is raised for writing upper-case characters by a key controlling a cylinder actuating a rock-shaft 111 and arm 112. As the typewheel returns from the impression-point, its rock-shaft actuates a forked lever which momentarily lifts the arm 28 and allows it to proceed towards the next projected stop 12. In order to ensure that no stop is passed over in this movement, a ring of downwardly-projecting pins 75 is provided, equal in number to the pins 12 and staggered relatively to them. The arm 28 is thus prevented from moving more than a short distance while in the raised position.