Patent GB-191412118-A (GB)
Title: Improvements in or relating to Typewriters.
Inventor: RAAP SALOMON VAN
IPC: B41J1/02
Filed: 1914-05-16
Granted: 1915-05-17
Abstract: 12,118. Raap, S. van, and Naamlooze Vennootschap. May 16. Index type-bar machines; type-carriages; alining for impression; case-shift mechanism.- Relates to machines in which a type-carriage is provided with a type-bar which is movable longitudinally for character-selection, rotatable for case-shift or fount-change, and depressible for impression. (1) The carriage 11 can slide on rails 8, 9 and carries on pivots 24 a ring 12 in which is rotatably mounted a disk 13 formed with an aperture 21 to receive the type-bar 1. The ring is formed in two parts provided with a groove to receive the disk; a ball bearing may also be provided. The disk carries pivoted arms 14, 15 formed with guide-ribs 67 engaging grooves in the type-bar, the arms being provided with catches 16, 17 for holding them in the operative position. (2) The type-bar shown in Figs. 1 and 3 is provided on opposite faces with types 2 and index-characters x for capitals and smalls. Four, six, or more cases or founts may be provided on different faces of the typebar, and the types may be for different languages. The type-bar shown in Fig. 19 is provided with sliding types 2 which are impressed by pressing the heads 64. (3) A stationary alining-bar 61, extending across the machine, enters between adjacent types during impression. The bar is secured to pivoted arms 57 which are normally horizontal but can be turned into the vertical position, springs 60 holding the arms in either position. The arms are pivoted to the cases 19, described below, of the ink-ribbon spools. The disk 13 is provided with catch-springs 69 which engage notches in the ring and hold the type-bar in the set angular position. Folding machines.-A pocket case consisting of a base or back 6 and a hinged cover 5 carries all the parts of the typewriter. When the typewriter is out of use, the parts are arranged as shown in Fig. 1. The handle 4 and the typebar are detached and are secured by clips 7 to the cover, the arms 14, 15 are turned back, and pivoted arms 10, to which the rails 8, 9 are secured, are turned downwards. The arms 10 are normally held up by hooks 22. Letter-spacing mechanism.-A positive pawl- and-rack feed is provided for the type-carriage; the feed may be assisted by means of a spring drum connected to the type-carriage. (1) The rails 8, 9 are formed with racks 31, 32 adapted to engage pawls 27, 28 secured to two half-rings 26 mounted on the pivots 24, the teeth of the two racks being staggered a half-tooth with respect to each other, and the teeth of the pawls being in the same vertical plane. The pawls are formed with lips 29, 30 adapted to engage the ring 12 and an annular spring 33 pivoted on the pins 24. When the type-bar is depressed for impression, the ring 12 engages the lip 29 and moves the pawl 27 out of engagement with the rack 31 and, by engaging the spring 33, causes the pawl 28 to move into engagement with the rack 32 and feed the carriage through half a space. On lifting the type-bar, the pawl 27 is, in a similar manner, moved into engagement with the rack 31, and the carriage is fed through another half-space. Spacing without printing is effected by depressing and raising the typebar through an arc slightly less than is usual, so that the types do not touch the paper. (2) the spring drum 36 is connected to the typecarriage by a cord 34 which passes over pulleys and along a groove in the rail 8. Carriage-releasing arrangements.-The pawl 28 can be moved backwards out of engagement with the rack 32 by gripping - members 37, Fig. 8, pivoted on pins 70 on the carriage, one or both of the members being provided with a shoulder 65 adapted to engage a bevelled nose 66 on the half-ring 26. Paper-supports; paper feeding and guiding arrangements.-The platen 18, Fig. 3, is inclined at the same angle as the type-bar, when this is in the impression position, and is secured to a frame 47 which can be depressed to the position shown in Fig. 3 to permit of insertion of the paper. The frame 47 is provided with cross-pins 48 which are guided vertically by slots in two fixed guides 50 and engage inclined slots in a slide 52 movable longitudinally by means of a lever 20. The paper is fed by rollers 38, 42, the rollers 42 being carried by levers 43 having pin - and - slot connexions with the frame 47. On moving the lever 20, the platen is depressed, and the rollers 42 are raised. Feed-roller detents.-The rollers 38 are provided with thumb-wheels 39, Fig. 1, and with star - wheels 40, Fig. 3, engaging flat spring detents 41 which regulate the line-spacing. Ink-ribbon mechanism. - The ribbon 46 is carried by spools 54, 55 provided with thumbwheels for feeding the ribbon. The thumbwheels engage spring detents. The spools are journaled in cases 19 connected by a bar, which is pivoted on lugs a on the base 6 to enable the cases to be turned outwards for the purpose of giving access to the spools.