Patent GB-190425573-A (GB)
Title: Improvements in and relating to Type-writing, Calculating, and like Machines.
Inventor: DONLEVY JOHN PATRICK LEO
Filed: 1904-11-24
Granted: 1905-11-23
Abstract: 25,573. Donlevy, J. P. L. Nov. 24. Calculating-apparatus. - Relates to (1) means for effecting the rotary and longitudinal movements of the typecylinders or the like of type-writers or calculating &c. machines, by means of a small number of key-levers, (2) the use of pedal mechanism for operating the shift mechanism or for returning the carriage and effecting line-spacing &c., in place of the handoperated mechanism usually employed for these purposes, and (3) the use of mechanism operated by stops similar to those of an organ for effecting the operation of the parts referred to in (2), in p!ace of the pedal mechanism. (1) Fig. 1 shows a sectional elevation of a typewriter having a type-cylinder b on a shaft c arranged to rotate and move longitudinally in bearings k, l, l on the frame or casing a. The longitudinal movements of the type-cylinder to bring different circumferential rows of characters into position are effected by key-levers e, preferably four in number. These when depressed act upon the horizontal arm d<1> of a bell-crank lever, the vertical arm d of which is connected by a rod f to a lever g which moves the shaft c or the type-cylinder. The arm d' may be provided with adjusting-screws with which the key-levers e engage, and stop-screws h may be provided for stopping the movement of the key-levers. On the key-levers are rubbing blocks i for engaging the screws. Rotation of the type-cylinder is effected by key-levers v<1> ... v<5>, preferably five in number, which act in a similar manner to the levers e, and are mounted on an arm w pivoted at u. The arm w is connected by a rod y to one arm of a lever x, the other arm of which is connected by a rod z to an arm 1 of a lever s connected by a rod t to a slide q movable on guiderods o parallel to the shaft c. This slide q carries a rotatable pin engaging a helical groove in a sleeve n on the shaft c. The shaft rotates with, but is longitudinally movable in, the sleeve n which is confined between the bearings l. As the slide q moves, its pin engaging the groove causes the rotation of the sleeve and type-cylinder. In order to move the type-cylinder into positions intermediate 'of those into which it is moved by the keys v<1> &c , a shift key 7 is provided which depresses a bar 8 connected by rods 9 to verticallymovable slides p carrying the guide-rods o, so that the slide q is depressed and the sleeve n rotated a step whenever the shift key is operated. An arrangement is shown whereby the simultaneous depression of the two keys v<1>, v<2> causes a rotation of the type-cylinder in excess of that imparted by the key v' when depressed alone. An arm 2 is pivoted on the framing at 3 and is formed with an inclined end 4, which is engaged by the lever v<1> when depressed so that the arm 2 is swung to the right. If the lever v<2> be at the same time depressed, it passes down into a deep notch 6 in the arm 2. When the lever v' is depressed alone, it is stopped by a higher shoulder or notch 5 on the arm 2. (2) The use of a pedal is described for returning the carriage. The pedal is connected to a wheel having a ratchet connection with a second wheel connected by a cord &c. to the carriage The depression of the pedal causes the rotation of both wheels and return of the carriage. The Provisional Specification describes also a shift mechanism for rotating the type-cylinder through half its circumference to bring another set of types into position. This is effected by a movement of the slide q and by its engagement with another part of the bar by which it is moved from the key-levers.