Patent GB-191321976-A (GB)
Title: A New or Improved Typewriter.
Inventor: RUSSELL WILLIAM EARNEST
IPC: B41J1/32
Filed: 1913-09-30
Granted: 1914-06-25
Abstract: 21,976. Russell, W. E. Sept. 30. Type wheel machines for writing on books.-Relates to machines in which (1) the keyboard is stationary and the type-wheel moves for letterspacing, and (2) the machine is placed over the book &c. and is independent of the means for holding or supporting the book &c., and comprises a carriage v provided with a type-wheel or drum k arranged so that the keys a rotate the drum for character-selection and depress the carriage with the drum for impression on the book &c. The machine is preferably supported on rollers 21, 22 and is provided with adjustable feet 24, 25 for supporting the machine when writing near the edge of the book &c. Type-wheel actions; type-carriages. - The keylevers a are pivoted on a rod b and are arranged over a universal bar d secured to levers e which bear on levers f pivoted at g, the universal bar being inclined to afford different amounts of lostmotion for the key-levers. The levers f are joined by a bar h engaging a fork i which is connected by gearing comprising a quadrant j to the type-drum k. The rod h and the fork i may be replaced by gearing. The type-carriage v can slide on rails u, the fork i always engaging the bar h. The rails are secured to supports t which are pivoted at w to levers s arranged under levers r joined by a universal bar q which is in the path of the key-levers. On depressing any character-key, the drum is rotated to bring the corresponding character over the printing point, and the type-carriage is depressed for impression. The drum is prevented from overrunning by means of a spring-tensioned quadrant k<1>, Fig. 3. On release of the key, the type-carriage is raised by springs, and the bar h is returned by plate-springs h<1>. Alining for impression. - An alining - detent l, Fig. 3, is held by a spring p<1> in engagement with a crown - wheel m on the drum during impression. When the carriage is raised after impression, the detent is released by means of a stationary rail p which engages an arm n on the spindle o of the detent. Case-shift mechanism.- The drum k is provided w i t h three angularlyarranged rings of types, any of which can be brought i n t o printing position by tilting the type-carriage u about the pivots w by means of a hand-lever y, Fig. 2, connected to one of the supports t by a link x. Roller inking-arrangements.-Inking-rollers 30, Fig. 1, are arranged in the slotted end of a spring- controlled plate 20 which is traversed with the type-carriage u. When the type-carriage descends, the inking-rollers wipe over the types on the drum k. The type-carriage is preferably provided with an arm adapted to engage an arm on the plate 20 so as to move the inking-rollers positively clear of the drum. Letter-spacing mechanism; space-key actions.-The type-carriage v is drawn to the right by the tape 2, Fig. 1, of a spring-drum 3 and is controlled for letter-spacing by an escapement consisting of a lever 9, Fig. 3, journaled on the type-carriage and provided with fast and loose dogs 6 which engage alternately a stationary rack 7. The lever 9 is formed with an extension 10 which co-operates with a strut 11 formed on a frame 12 which is traversed with the type-carriage and can be rocked by depressing the space-bar 13. When the type-carriage is depressed for impression, the strut 11 acts as a stationary abutment for t'e extension 10 and the escapement is operated. When the space-bar is depressed, the strut is raised and the escapement is operated independently of the impression-mechanism. Back-spacing mechanism.-The type-carriage v is connected by a tape 4 to a drum 5 provided with a ratchet feed. Carriage-releasing arrangements.-The feed-rack 7, Fig. 3, is held down by springs 8 and can be raised for carriage-release. Line-spacing mechanism.-One of the supporting- rollers 21 is rotatable by a wheel 23, Fig. 1, for line-spacing. In some cases, the machine may be arranged over a cylindrical platen which is rotated for line-spacing. Tabulating - mechanism. - The type-carriage is provided with a stop 28 adapted to engage adjustable stops 27 consisting of L-shaped arms mounted in a stationary comb 26.