Patent GB-189919613-A (GB)
Title: Improvements in Typewriters.
Inventor: CARMONA MANUEL SANCHEZ
Filed: 1899-09-29
Granted: 1899-11-25
Abstract: 19,613. Carmona, M. S. Sept. 29. Type-writers.-Relates to type-writers in which the writing-surface is stationary and the type are located upon a carriage which travels over it. The machine is in this respect similar to that described in Specification No. 11,779, A.D. 1899, and the type bands or tapes may be constructed in the manner described therein. The base is formed in four hinged sections adapted to close up so as to enclose the machine, and the key levers are jointed to render this possible. Fig. 4 shows a vertical section of the machine from front to back. The keyboard consists of five type-locating keys 23 and two type-box shifting keys 25. The required type is brought to the impression point by the depression of the keys in a definite combination, but a "synthetiser" furnished with the full number of independent keys 33 is detachably arranged above the keyboard for use if required. Fig. 14 illustrates the principle of the synthetiser, the depression of the key 33 causing the movement of four of the five bars 35, which are members of pivoted U-shaped frames and are provided with projections 37, Fig. 4, engaging the keys 23. The ends 29 of the key levers 23<a> co-operate with vertical slides 67 at the back of a plate 43, which constitutes the carriage guide and is hinged at 44 to the base 126. The guide is dovetailed to receive a sliding carriage 46 which contains the type-box 49. The effective length of the guide can be increased by means of a sliding extension. The type-box is adapted to move in the carriage from front to back, and is carried upon a pair of levers constituting a lazy-tongs system for this purpose. The shift keys move the type-box so as to bring either of the three type-bands into use, the selected band passing at the impression point over a shoe which is depressed so as to cause one of the types carried thereon to project as shown at 56, Fig. 4. The carriage is provided with an actuating-spring and an escapement feed. The raising of the slides 67 by means of the key levers first effects the necessary movement of the typebands to bring the required type to the impression point. When, however, the slides 67 reach the stops 66, the further movement of the key levers causes the guide 43 to turn on its hinges 44, depressing the carriage and bringing the selected type 56 into contact with the paper. Fixed and movable pawls 70, 71 co-operate with a rack 69 carried by the pillars 120 so as to cause an advance of the carriage on its return from the depressed position. A differential feed is secured by means of a trebly-stepped plate which limits the movements of the pawl 71, the characters being arranged on the three type-bands in accordance with their width. The means by which the fixed keyboard is caused to effect the shifting of the type-box and the location of the type in the moving carriage is shown in Fig. 2, which is a plan with parts in section on the line 2-2, Fig. 4. The shift keys 25, 26 act upon slides 79 carrying pulleys, the movement of which results in a shortening of the cord 81, both ends of which are fixed to the guide 43, the one at 91 and the other at the extreme right-hand end. The cord 81 passes over pulleys 87, 88, 89, and 90, of which 87, 88, and 90 are journalled upon the carriage. The pulley 89 is carried by the type-box, and is adapted to move in a slot 46<a> of the carriage. A movement of the carriage towards the right will produce no shortening of the cord 81, which will merely slip over the pulleys 87-90, but the lateral movement of either of the shift keys will shorten the cord and cause a movement of the pulley 89 in its slot, and a consequent shifting of the type-box in the carriage. The key 25 produces twice as much contraction in the cord as the key 26. The type-locating keys 20-24 act upon the slides 67 as above described. These slides carry small pulleys varying in number and in extent of movement, and co-operating with fixed pulleys so as to produce contractions in a cord 100, the contraction varying in the ratio 1, 2, 4, 8, 16. Each combination of keys depressed produces, therefore, a definite movement of the cord, which is fixed at 110 to the guide 43 and also at its extreme right-hand end. The cord 100 passes over pulleys 102, 103, 104, 105, 106, 107, and 108, all of which are journalled on the carriage with the exception of the pulley 105, which moves in a slot 46<b> in the carriage and engages a slide which produces the required movement of the spring-controlled type-bands. The carriage is thus free to move without affecting the position of the pulleys 89, 105 in their guiding-slots, such position being determined solely by the fixed keyboard operating through the medium of the cords 81, 100. Line spacing is effected by the action of rubber-braked rollers 112, 117, Fig. 4, of which the former acts like the retaining-pawl of a ratchet mechanism, while the latter serves to push forward the paper when the key 122 is depressed. In a modified form of machine, the connection between the fixed keyboard and the movable carriage is supplied by the use of splined pulleys on the carriage which traverse a pair of longitudinal shafts operated from the keyboard.