Patent GB-156618-A (GB)
Title: An improved typewriter of the type bar class
IPC: B41J7/90
Filed: 1921-01-06
Abstract: 156,618. Schõffer, W. Jan. 6, 1921. tions determined by the projected stops. In the machine shown in Figs. 2 and 4, the type-bars 40 are mounted with slight longitudinal freedom on slides 41 carrying stop-levers 44 which are normally retained in the horizontal position by springs 43. The carriage 46 travels step-by-step on rails 48, and carries pivoted plates 45 resting on bars 47 each having a projection 50 engaging one of a series of bars 51 connected to key-levers 53. At each operation of a key, the associated bars 51 and 47 are raised, one of the plates 45 being rocked and pressing forwards one of the springs 43, thereby permitting the associated stoplever to drop. The operation of the keys is repeated until one stop-lever on each slide has been permitted to drop; thereupon, a bar 56 is moved laterally, and by engaging the selected stop-levers moves the slides and type-bars and positions the selected types at the printing line, impression being effected by a rocking platen-roller 57. After impression, the selected stop-levers are raised by a rocking bar 69, and the slides are returned by the bar 56 which engages projections 58 thereon. The type-bars 40 are provided with three cases of types, a capital letter and a numeral following each small letter, and the type bars can be shifted on the slides 41 by means of levers 61, 62 which co-operate with projections 63 on the type-bars, and engage cross-bars 59, 60 operated by shiftkeys. The type-bars are retained in the normal position by detents 65, and are returned by springs 64 and a cross-bar 66. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the following subject-matter, which does not appear in the Specification as accepted. Type-wheel machines.-A line-printing typewriter comprises a series of rings 5, Figs. 2 (Cancelled) and 3 (Cancelled), which are differentially revoluble on stationary rings 3 and are each provided with a fount or case of radially movable types 6, the rings 3 having projections 7 for raising and supporting the selected types at the printing- line. The types are guided by slots and projections 5<1>, 5<2>, and are raised in opposition to springs 8. The setting-device consists of an arm 4 which is rocked differentially to bring a selected type to the printing-line, and is traversed step-by-step across the machine. The arm co-operates with fingers 16 on the rings 5, and fingers 16<1>, 16<2>, 16<3> of graded length on certain of the types. A spring-finger 37 on the arm engages the fingers at the front. The arm is feathered on a shaft 14 which is rocked differentially by means of arms 31 connected to inclined bars 30 arranged above the key-levers 29. The arm is moved step-by-step by means of a bar 14 mounted on guides 9 and drawn to the right by means of a spring-drum, release being effected by means of spring escapement-pawls 12 engaging a rack 13. The bar 10 is returned or set manually by means of a hand-lever 27 geared to a spring drum 24 which is connected to the bar. The handlever may also be employed for retaining the bar when the arm is to be actuated more than once to select capitals &c. The rings 5 are returned to the normal position by means of a member 19 mounted on arms 20, and provided with tappets 19', 19<2>, 19<3> of graded length for engaging the fingers 16<1>, 16<2>, 16<3>. The end of the arm 4 yields in opposition to a spring 38 when passing under the fingers. The types are provided with white characters 39 for displaying the set line. The machine may be operated electrically, and may be controlled from a distance by a similar machine arranged so that the setting of the types sends a current to line. Type-band machines. - The type-wheels described above may be replaced by endless chains passing over rollers or rods which co-operate successively with a. setting-device consisting of a pinion.