Patent GB-313918-A (GB)
Title: Improvements in multiple impression typewriters
IPC: B41J3/26
Filed: 1929-06-13
Abstract: 313,918. Dictatype Shorthand Machine Co., Inc., (Assignees of Bourquin, P. P.). June 19, 1928, [Convention date]. Stenographic type-lever machines; case - shift mechanism; shift - key actions; keyboards. - Type-levers arranged vertically at the front of the platen and bearing two or more types are connected by links to keylevers and are mounted on one or more rocking supports having pin-andslot engagement with shift-key levers. The machine may include the web - feeding and inkribbon mechanism described below. In the machine shown in Figs. 1, 3 and 6, vertical typelevers 85, 91 are connected to key-levers 79 by means of links 88 arranged below the pivot rod 84 of the key-levers. A block 83 supports the pivot rod and is formed with guide slots for the keylevers and type-levers. The type-levers 85, 91 are arranged at the sides and middle of the system and bear three consonant and figure types, and one vowel type respectively. The keyboard comprises vowel keys 68 - - 71 for operating the typelevers 91, two sets 75, 76 and 77, 78 of consonant or figure keys for operating the type-levers 85, shift-keys 72, 73, a shiftbar 74, and spacing-keys 67. The type-levers 91 are pivoted on a stationary rod and the two sets of type-levers 85 are pivoted on two independent supports 101, Fig. 6, which can rock on a stationary rod 103. Each support has a pin 106 engaging cam-slots 107, 109 which are formed in depending arms 110, 107 on the levers 74<a>, 114 of the shift-bar and the associated shift-key, and are adapted to depress and raise the typelevers respectively. The arms 108, 110 have recesses 120, 119 for permitting movement of the pin. The cam-slots 107, 109 are formed with arcuate extensions 117, 118 which are concentric with the pivot rod 84 and co-operate with the pin 106 to limit the movement of the support. One of the cam-slots co-operates with the pin to hold the support and type-levers in normal position. The shift-bar levers 74<a> are provided with depending arms 137 connected by a tie-bar 138, a depression 140 in the base being arranged under the tie-bar. A cushion 139 on the type-bar forms a silent stop for the shift-key levers 114. Returning-springs 97 hold the key-levers in contact with a cushion 94 mounted on brackets 96. Web - feeding arrangements; line - spacing mechanism. - A web 16, Figs. 1 and 3, receiving imprints from the type-levers 85, 91, passes around a platen 27 which is rotated for line-spacing during the return movement of the levers 79 of the printing-keys and spacing-keys 67, the spacing-keys imparting a longer feed than the printing-keys. Preferably there is provided a toothed plate 35 secured to plates 130 which are mounted loosely on the platen spindle 45 and are connected by links 128 to rocking brackets 122, 123 carrying a universal bar 99 operated by the key-levers. The universal bar may consist of a felt member mounted in a channel 124. On depression of the key-levers, the plate 35 is retracted, and on release of the key-levers', springs 126, 127 return the brackets and the plate rotates the platen. Reverse movement of the platen is prevented by means of a plate 33 secured to a pivoted spring-urged bracket 133. The web is led from a roll 17 and passes over a guide-plate which is mounted under the platen and is provided at the front with a spring extension for holding the web in contact with the platen. The roll is mounted on a pivoted frame 30 having depressions 41 for receiving the roll spindle 29, flared openings being arranged at the outer side of the depressions. Ink-ribbon mechanism.-Feed-mechanism is operated during the return movement of the keylevers 79, Figs. 1 and 3, and preferably consists of a known manually-reversible train of gearing 47 comprising a pinion 54 engaging a pinion 46 on the platen shaft 45, and a pinion 50 for alternately engaging pinions 49, 48 on the ribbon spools 42, 43. The pinion 54 carries integral platen-pinions 55, 56 which have slightly different numbers of teeth and engage a stationary pinion 58, and a pinion 59 integral with the pinion 50 respectively. The train is mounted on a pin 51 on a support 52 which it pivoted at 53 and can be rocked to reverse the feed by means of a fingerlever 61 pivoted on the pin, and a spring 64 connected to a stationary bracket 66 and a depending part 60 of the finger-lever, the part 60 having a slot 62 receiving the pivot. The spring passes from one side to the other of the pivot 53 when the finger-lever is rocked. Specification 313,610 is referred to.