Patent GB-461435-A (GB)
Title: Improvements in or relating to portable typewriters
IPC: B41J3/36
Filed: 1935-08-16
Abstract: 461,435. Typewriters. DOBROVOLNY, O., and VRZBA, A. Aug. 16,1935, No. 23092. Convention date, June 23. [Class 100 (iv)] Portable machines; paper carriages and supports; sheet feeding and guiding arrangements.-A paper-carriage for a portable machine is associated with a stationary platen and is extensible longitudinally to accommodate sheets of different widths. The paper-carriage 85, Figs. 1 and 2, is provided with a telescopic feed-rack 48, 49 for letterspacing, and two pairs of feed-rollers 55, 58 for feeding the sheet over a narrow, stationary platen-roller 69, the righthand pair of feed-rollers being moved away from the left-hand pair when the paper-carriage is extended. The feedrack 48 is formed on a tube 46 which is secured to the left-hand end-plate 54 of the paper-carriage and passes through a guide 53 on the base 1. The feed-rack 49 is formed on a rod 50 which is mounted in the tube 46 and is secured to the right-hand end-plate 54. A spring-button holds the feed-racks in extended position. The feed-rollers 55 are mounted in brackets 57 on the end plates 54. The left-hand and righthand feed-rollers 58 are secured to telescopic sleeves 60, 64 which are journalled in the left-hand and righthand end plates and are provided with knobs 59, a rod 63 secured to the sleeve 64 being splined to the sleeve 60. A scroll 65 for receiving the bottom part of the sheet is mounted in a curved bracket 67 secured to an extension 66 of the base 1. The platen-roller 69 is pivoted on a curved arm 71 which is pivoted on the extension 66 and rests yieldingly on the bracket 67. Platen-shift mechanism; shift-key actions.-A finger-lever 75 for shifting the platen-roller 69 has pin-and-slot engagement with a link 74 which is connected to an arm 78 on the pivot 72 of the supporting-arm 71 of the platen-roller. Type-lever actions.-The key-levers 14 are connected by links 15 to subjacent auxiliary levers 16 which are connected by links 8 to the type-levers 4, the type-levers, auxiliary levers, and key-levers being arranged radially and being detachably pivoted on segments 3, 18, and 12. The links 8 enter slots 6 in the type-levers. Letter-spacing mechanism; space-key actions. -A feed-pawl co-operates with a star-wheel 39 provided with a pinion 40 co-operating with the feed-rack 48, 49 on the paper-carriage 85. The feed-pawl is carried by a lever in connection with a slide 32 having pin-and-slot engagement 31 with a bell-crank 26 which is connected by links 25 to rocking arms 23 carrying a universal bail 22 arranged in the path of the action-levers 16. When the key-levers 14 are released, the universal bail is returned by means of springs 21, and the feed-pawl is effective. A detent consisting of a spring-plunger co-operates with the star-wheel 39. The space-key 45<e> is carried by a pivoted frame 45<c> abutting on a pivoted frame 45 which abuts on lugs on the universal bail 22. Ink-ribbon mechanism.-A short length of ink ribbon, arranged over the platen-roller 69 at the printing point, is detachably mounted in a support carried by the bracket 79 that carries the type-aligning guide 80. The ink ribbon is provided at the ends with tags which are received by slots in the support.