Patent GB-243491-A (GB)
Title: Improvements relating to typewriting machines
IPC: B41J1/32
Filed: 1924-10-13
Abstract: - 243,491. Schildenfeld, R. Oct. 13, 1924. No Patent granted (Sealing fee not paid). Type-wheel actions. - Relates to machines of the kind wherein a type-wheel or group of type-wheels is axially movable in the direction of the line of writing for letterspacing, and consists in the provision of key-actuated means for setting a typewheel and operating the hammer - impression mechanism and letter - spacing mechanism. As shown in Fig. 1, three type-wheels 7 . . 9 are freely rotatable upon a sleeve 6 which is slidably mounted on a sleeve 4 provided with a projection 5 extending through a longitudinal slot in the sleeve 6, and adapted to connect any one of the type-wheels to the sleeve 4, the latter sleeve being slidable upon, and rotatable with, a transverse shaft 3 which is rotated upon the depression of a character key. The key-levers 12, pivoted upon a transverse shaft 11, are arranged in left and right hand groups bearing upon transverse rocking arms 13, 13<1>, respectively connected to levers 14, 14<1> also pivoted upon the shaft 11 and provided with rearward extensions 15, 15<1>. The setting- mechanism is duplicated at each side of the machine to produce rotation of a typewheel in opposite directions. Fig. 3 shows the left hand mechanism, wherein a pin 17 on the universal lever arm 15 abuts against a nose 18 on a lever 20 which is pivoted at 21 and is connected by a pin and slot at the other end to one end of a slidable rod 22 provided with a projection 23 engaging a forked member 24 secured to a transverse rail 25 hinged upon a shaft 26. The end of the shaft 26 adjacent to the forked member 24 is secured to one end of a bar 27, slidably supported .at the other end by a guide 31, and provided with rack-teeth 32 engaging a pinion 33 on the type-wheel shaft 3. Resting on each key-lever 12 is a T-shaped lever 37 pivoted on a transverse rod 38 and provided with an adjustable stop, for example a screw 39, which is normally above the plane of a flange on the rail 25. Vertical stops 36, 39<1> on the levers 14, 14<1> normally hold the rails 25, 25<1> in their position of rest. Depression of a left-hand character key rocks the lever 14, 15, causing the lever 20 to swing rearward' and draw the rod 22, shaft 26, and bar 27 with it against the action of springs 34, 35 on the bar 27, and producing rotation of the type-wheel shaft 3. The lever 37 which rests on the lever of the actuated key is lowered with the key-lever, whereupon its stop 39 meets the moving rail 25, causing the latter to tilt until the forked member 24 is disengaged from the projection 23 on the rod 22. The type-wheel is held in the set position by a pawl 28, which is mounted on the shaft 26 and is engaged bv a stationary rack bar 29 on the side of the machine when the rail 25 and member 24 are turned by the stop 39. Additional means for holding the type-wheel in the set position is provided by a pawl 70, which engages a ratchet wheel 66 on the sleeve 4 immediately before printing is effected, being actuated through a link 68 by an arm 67 on a bell-crank lever 43, 49 forming part of the letterspacing mechanism. Letter-spacing mechanism; space-key actions. -A carriage 45, Fig. 1, connected to a driving- spring 50, is slidable laterally on a rack-bar 46 and transverse shaft 16, and carries projecting arms 47, 48 engaging the sleeve 4 carrying the type-wheels 7 .. 9. One arm 43, Fig. 2, of a double-armed lever 43, 49. pivoted at 44 upon the carriage 45, rests loosely upon a transverse rocking-bar 41, the arm 49 being normally in engagement with the rack-bar 46. The rooking bar 41 is disposed above rear extensions 40 on the keylevers 12, and is supported bv end arms 42, 42<1> loosely pivoted on the shaft 11 to which the keylevers are pivoted, so that on the depression of a character key it locks the lever 43, 49 rearwa,rdly and disengages the arm 49 from the rackbar 46, the arrangement being such that the movement takes place after printing is effected. The space-key 75 is arranged to operate the bar 41 without actuating the character-selecting or impression mechanism. Case-shift mechanism.-The shift-key levers 51, 52, Figs. 1 and 2, are provided with stops 53. 54 to operate on depression a double-armed lever 56 pivoted at 55 and supporting one end of a transverse bar 57, the other end of which is supported by a pivoted arm on the other side of the frame. A sleeve 58, slidable upon tho bar 57, is secured to one arm 59, Fig. 4, of a doublearmed lever 59, 60 pivoted upon the type-wheel carriage 45, the arm 60 being in engagement with a sliding member 61 provided with slots to receive guide pins 62 on the carriage 45. A forked member 63 which embraces the ends of the sleeve 6 carrying the type-wheels 7, 9 has its single-ended arm secured to the slide 61, so that when a shift-key is actuated the consequent raising of the bar 57 turns the lever 59, 60 and produces lateral movement of the slide 61 and sleeve 6, thereby moving the type-wheels axially and putting one of them into engagement with a projection 5 extending through a slot in the sleeve 6 from the sleeve 4, which rotates with the shaft 3 controlled by the character-keys. The disengaged type-wheels are held against rotation by means of pins 64, 65 projecting inwardly from the arms 47, 48 of the type-wheel carriage, sufficient space being left between their ends to permit rotation of the operative type-wheel. As shown in Fig. 1, the type-wheel 8 is in the operative position, consequent upon the depression of the shift-key lever 51. Hammer-impression mechanism.-A universal bar 13, Fig. 1, beneath the key-levers 12 is carried by levers 14, 14<1> which are pivoted on the shaft 11 and have rearward extensions 15, 15<1> provided with inturned ends in engagament with pivoted arms 71, Fig. 3, carrying a transverse rail 72, preferably of indiarubber, which is disposed beneath the paper fed between rollers 73, 74. The inoperative type-wheels are provided with a gapped portion 10 against which the paper strikes during impression.