Patent GB-378605-A (GB)
Title: Improvements in or relating to typewriting machines
IPC: B41J17/00
Filed: 1931-06-26
Abstract: 378,605. Typewriters. BURGESS, A. F., 10, New Court, Lincoln's Inn, London.-(Smith & Corona Typewriters, Inc., L. C.; .51, Madison Avenue, Manhattan, New York, U.S.A.) June 26, 1931, No. 18519. [Class 100 (iv).] Carbon-sheet arrangements ; web feeding and guiding arrangements ; margin stops.-In a web-manifolding arrangement, the platen 7, Figs. 12 and 13, is provided with one or more holders 70 for carbon sheets 96, and a longitudinal member 73 for folding the carbon sheets and the webs or the plies of a fan-fold web 95 around the platen during backwards rotation thereof. Initially as shown in Fig. 12, the carbon sheets extend forwardly and are covered by a form-length of the webs, and on backwards rotation of the platen, the member 73, in co-operation with means such as a feed-roller 80, folds the webs and carbon sheets and causes them to wrap around the platen. Typing can then be effected, the platen being rotated forwards by the line-spacing mechanism or the finger-wheels until the holders are again in initial position, whereupon the webs and carbon sheets are folded forwards, new form-lengths of the web are pulled forwards over the carbon sheets, and the operations are repeated. The webs can be pulled forwards without binding, since they are flat during the operation. The typed form-lengths are torn off by means of a bar 82 which serves also to support the web .and carbon sheets. A table 86 and the front bar of the carriage 46 are provided with adjustable side-gauges 89, 91 for the webs. In the apparatus shown in Figs. 2 and 3, the platen 7 is associated with stop means for limiting'the backwards and forwards rotation, and is provided with a radially-movable yoke 19 carrying detachable fingers 70 for engaging loops on the carbon sheets. The free edges of the carbon sheets have notches to permit of pulling forward the webs. The fingers are arranged in two alternating sets secured at one end to spacing-blocks 71, 71<1> fitted on pins 68, 69 on the yoke respectively. A bar 73 for engaging the webs and retaining the spacing- blocks is pivoted on the yoke and secured by a catch 78. The yoke is arranged in a channel 16 in the platen, and the legs engage slots in flanged endplates 10, 11 on the platen, slots 20 in the legs co-operating with the platen shaft 8 to limit movement of the yoke. The yoke is urged outwards by springs 21, but is normally locked in the inner position, the bar 73 being flush with the platen, by means of a spring-urged bell crank 37 which is pivoted on the endplate 10 and engages a notch 47 in one of the legs. The bell-crank engages a pin 45 on an arm 41 which is loose on the platen shaft and is coupled to the endplate 10 by means of a spring washer 43, a stop-pin 44 on the arm co-operating with stops 39, 40 on a bracket 38 on the carriage. The platen shaft is loosely mounted in the platen and has arms 23 provided with pins engaging notches 25 in the legs of the yoke. Initially the yoke is in the outer position, and the platen is held by means of a spring-urged arm 26 which is pivoted on a stud 29 on the carriage and has a finger 31 co-operating with a notch in a disc 14 on the endplate 10. When the platen shaft is rotated backwards, the yoke is moved into the inner position by means of the arms 23, the webs being thereby clamped to the platen, and the arm 26 is released by one of the legs of the yoke. During further backwards rotation of the platen shaft, the platen is turned thereby and the webs and carbon sheets are wrapped around the platen in the above-described manner. During the backwards rotation, the arm 41 is arrested by the stop 39, and when the platen has been turned through slightly more than one revolution the bell-crank abuts on the pin 45 and arrests the platen. During forwards rotation of the platen, the arm 41 is arrested by the stop 40, and when the platen is in the initial position the bell crank 37 cooperates with the pin 45 to arrest the platen and release the yoke. Line-spacing mechanism.-The line-spacing wheel 15, Fig. 6, co-operates with a rollerdetent 50 carried by a spring 48, and means is provided for holding the detent out of engagement during backwards rotation of the platen. For this purpose a cam-plate 61, loose on the platen shaft 8, engages the axle of the detent, an arm 58 loose on the platen shaft having a pin 59 for engaging the camplate and a slot 60 in the line-spacing wheel. When the platen is rotated backwards or forwards the cam-plate is displaced and the detent is disengaged or engaged. The slot 60 is adjustable by means of a masking-plate 65 and enables the line-spacing wheel to rotate through slightly more than one revolution. A finger-lever 55 for manually releasing the detent has a pin 57 co-operating with a cam 52 on the spring 48.