Patent GB-389641-A (GB)
Title: Improvements in or relating to typing-machines
IPC: B41J1/32
Filed: 1932-02-20
Abstract: 389,641. Typewriters. TEISSEDRE, G., 1 A, Boulevard Gambetta, Strasburg, Alsace, France. Feb. 20, 1932, No. 5088. Convention date, Feb. 25, 1931. [Class 100 (iv).] Type-wheel actions; type-wheels.-A swinging type-wheel machine in which the type-drum and other moving parts are of small mass, and means are provided for rapidly accelerating the type-drum to effect impression comprises any or all of the following features : (1) a rolling-lever action for swinging the type-drum, (2) a type-drum consisting of a thin non-rigid jacket mounted to turn and slide on a rigid core, and (3) a type-jacket provided with four rows of types and operated by a standard fourbank keyboard, single-shift and double-shift being effected by the corresponding banks of keys, and by a shift-key respectively. The type drum 19 shown in Fig. 7 consists of a very thin light jacket, formed for instance from steel, aluminium alloy, or synthetic resin, and is supported by a cylindrical core 9a which is secured to a rocking arm 9. Arranged under each lateral half of the keyboard is a shaft 1, Fig. 1, provided with rolling levers 2, 2<1> each co-operating with a cam 3 or 3<1> on one of the key-levers 36, an arm 4 on the shaft being connected by a link 5 to a rolling lever 6 co-operating with a rolling lever 7 which is connected by a link 8 to the arm 9. The levers 6 are connected by springs 20, 20a, Fig. 4, and rods 14, 14a, Fig. 4, to a plate 15 pivoted at 16a to an arm 15a which is pivoted at 16 to a plate 33. The plate 15 has pin-and-slot engagement with a sector 17 co-operating with a pinion 18 on a spindle 32 connected to the type-drum. The sector is connected to rocking arms 22 co-operating with stops 23 operated by the key-levers. On depression of any keylever, the plate 15 is rocked, the type-drum is rotated into the position determined by the associated stop 23 to effect type-selection, and the arm 9 is swung towards the platen 12 with rapid acceleration to effect impression. If any key-lever is depressed before the previously depressed key-lever has returned, the plate 15 is moved idly until the latter key-lever has returned. The rolling levers 6, 7 may, as shown in Fig. 3, be replaced by a toggle 11 which is preferably mounted on a spring 13 to compensate for difference in thickness of the paper on the platen 12. Inking may be effected by a short endless ink-ribbon. Aligning for impression.-The sector 17, Fig. 4, is carried by a lever connected to the arm 9 and so arranged that, before impression is effected, the sector is forced into engagement with the pinion 18 to.align the type-drum. Case-shift mechanism.-The type-jacket 9, Fig. 7, has rows I, II of types for small letters, and rows III, IV for capitals and figures, single-shift being effected by shift-key mechanism, and double-shift by another shiftmechanism operated by the two lower banks of key-levers. Preferably, the shift-keys rock arms carrying the supporting-plate 33, Fig. 4, of the type-jacket mechanism, and the two lower banks of key-levers are provided with arms 24 engaging a rocking bail 25, Fig. 1, connected by linkage 27 to a bell-crank for raising the spindle 32 of the type-jacket. Alternatively, the shift-keys may actuate platen-shift mechanism. Keyboards.-To avoid strain on the wrists and elbows, the rows of keys are arranged in obtuse V-formation. Folding machines.-The side parts A, Fig. 1, of the framework can be folded on the diagonals to compact the machine.