Patent GB-190103226-A (GB)
Title: Improvements connected with Typewriters.
Inventor: HARNESS CORNELIUS BENNETT
Filed: 1901-02-14
Granted: 1901-05-18
Abstract: 3226. Harness, C. B., [Macrae, D. G.]. Feb. 14. Type - writers.- The machine is provided with ten typebars m directed radially towards a common impression-point. The type-bars are supported at the rear by arms 10 pivoted on a segmental rod 10<a>, which is mounted in a vertically-movable frame 6, carried by parallel links 7, 8. At their front ends the type-bars are supported by bellcrank levers n, p, pivoted to a fixed segmental rod 33. The segmental rods pass through dotted distance-pieces, which constitute comb-like separators for the levers n, 10. The rods are held firmly in position under the tension of nuts at their ends, and they are formed with a series of grooves or nicks which enable them to be curved without bending those portions which constitute the actual bearing-surfaces. The keys are arranged in three rows a, b, c, provided with rearward extensions which rest on a segmental pad d. Three keys, one in each row, are adapted to co-operate with each short arm p, in order to throw forward the corresponding type-bar and make the impression. Eachtype-bar bears nine type-faces, of which the central group of three is operative when the platen r is in the normal position shown by full lines, and the upper or lower group is operative when the platen is raised or lowered by means of the shift-keys 24, 23. Of each group of three type-faces the middle type is operative when the key a is depressed, and the upper and lower ones correspond to the keys band c. Beneath the three rows of keys are three padded platforms f, g, h, of which the platform f is secured to the universal spacing-frame u, and the platforms g, h are carried by frames pivoted on a shaft v. Rearward extensions w of these frames serve to operate bell-crank levers 1, 2 provided with cam-slots 4, which are adapted to act on a roller 5, so as to raise or depress the frame 6 and type-bar m. Each cam-slot is provided with a recess enabling the movement due to the other cam-slot to take place, and the crossing of the slot and recess ensures the rigid locking of the roller 5 as soon as the concentric part of the moving camslot is reached. The space frame u, which is depressed by the actuation of any key, is connected by a link 17 to a two-armed lever 18, which actuates an arm 21 of the escapement-dog rocker. The key pivots k move in vertical slots l, so that the actuation of the space-frame and of the camplates 1, 2 takes place before the arm p is lifted and the impression made. The paper carriage is held by bell-crank levers 13, pivoted at 15 to standards rising from the machine frame. One of the levers carries a roller 27, adapted to be thrown backwards or forwards to raise or lower the platen by meams of cam-slots formed in the rear ends 25, 26 of the shift-key levers. Recesses 28 enable the movement due to each cam-slot to take place freely in the other, and the angled portions 30 of the slots ensure the rigid locking of the roller 27 in the shifted position. The weight of the paper carriage may be balanced by means of a suitable coiled spring.