Patent GB-449080-A (GB)
Title: Improvements in or relating to typewriters or like machines
IPC: B41J35/22
Filed: 1934-11-19
Abstract: 449,080. Typewriters. WANDERERWERKE VORM. WINKLHOFER & JAENICKE AKT.-GES., Schonau, near Chemnitz, Germany.-(Assignees of Pfeiffer, J. F.; 61, Lowenstrasse, Zurich, Switzerland) Nov. 19,1934, No. 33274. Convention date, Nov. 18, 1933. [Class 100 (iv)] Ink-ribbon mechanism; sheet feeding and guiding arrangements.-A frontfeed device for sheets, mounted above the platen and comprising guides and feed - rollers, carries one or more duplicating - ribbons arranged along the printing line, the front-feed guides and feed-rollers being adapted to direct the front-fed sheets between the main ribbon and duplicating-ribbons. In the apparatus shown in Figs. 1, 11 and 12, a front-feed guide-shoot 4 for a sheet 119 is provided at the back with a plate 27 supporting spools 32, 33, and guides 71, 72 having guide-slots 81 ... 84 for a duplicating-ribbon 34 arranged along the front of the platen 113. A shield 85, covering the front of the duplicating-ribbon, consists of a strip of celluloid or the like having end loops for engaging fingers 88, 89 on the guides, the finger 88 being formed on a spring-urged arm 91. The spools 32, 33 run on hubs loosely mounted in arms 29 on the plate 27. A driving-shaft 35 for the spools is provided with a ratchet-wheel 47 co-operating with a pawl 56 on a rocking arm 54 in the path of an abutment operated by the line-spacing lever for the platen. The shaft 35 is provided with coupling-pins for alternately engaging the spools, and is moved longitudinally by means of a crank 46 to reverse the feed. The plate 27 is provided with arms 3 resting on pins 16 on the platen-shift frame 24, and is locked by means of a sliding catch 17. On release of the catch, the guide-shoot and duplicating- ribbon devices can be swung backwards into position, or can be detached. The guide-shoot and duplicating-ribbon devices are counterbalanced at each side by means of a plunger 107, Fig. 12, which rests on the carriage 24<a> and passes through a sleeve 105 on the arm 3, springs 111, 112 being arranged between pins 109, 110 on the plunger and sleeve. In operation, the guide-shoot and duplicating-ribbon devices are swung backwards and a secondsheet 115 is passed over the apron 114 and around the platen. The guide - shoot and duplicating-ribbon devices are then moved into normal position, the sheet 119 is placed in the guide-shoot and is fed downwards by means of feed-rollers 10, 11 into the space between the duplicating-ribbon and the ordinary ribbon 117. The walls of the guide-shoot are formed with rearward bends for directing the sheet. As described in Specification 418,500, an apron 116 for receiving the sheet may be arranged below the apron 114. The guides 71, 72 can slide on pins 77 ... 80 on the plate 27, and engage bell-cranks 96, 97 connected by a link 100. To prevent selected items on the sheet 119 from being duplicated on the recordsheet 115, the bell-cranks are rocked by means of a knob 120 to raise the duplicating-ribbon out of the printing line. The Specification as open to inspection under Sect. 91 comprises also the following subjectmatter. For automatically preventing selected columns on the sheet 119 from being duplicated on the record-sheet 115, means is provided for automatically raising the duplicating-ribbon 34 during the typing of those columns. The means comprise a bell-crank 132, Fig. 5 (Cancelled), mounted on the plate 27 and having a fork 133 engaging a pin on the guide 72. The bellcrank is connected by gears 130, 131 to a rocking arm 127, abutments 128, 129 on the bell-crank and arm being arranged to cooperate, during letter-space movement of the platen-carriage, with adjustable stops 124, 125 respectively on a stationary rack 123. When the stop 125 engages the abutment 129, the guide 72 and the guide 71, Fig. 1, raise the duplicating-ribbon, the abutment 128 moves into the path of the stop 124, and when engaged thereby restores to normal position the guides and duplicating-ribbon. This subject-matter does not appear in the Specification as accepted.