Patent GB-418438-A (GB)
Title: Improved sheet-feeding apparatus for typewriters
IPC: B41J11/36
Filed: 1933-03-21
Abstract: 418,438. Typewriters. PFEIFFER, J. F., 61, L÷wenstrasse, Z³rich, Switzerland. March 21, 1933, No. 8556. Convention date, March 21, 1932. [Class 100 (iv).] Sheet feeding and guiding arrangements; platen rotation for blanking; line-8pacing mechanism.-In front-feed apparatus comprising feed-rollers arranged above the platen, a lineselecting device with indications corresponding to the lines on the sheet, preferably a dialling- disc, is provided for rotating the feed-rollers to feed an account sheet into the required lineposition, and means may also be provided for reversely rotating the feed-rollers to eject the account sheet after one or more lines have been typed thereon. The apparatus shown in Fig. 1 is mounted as a unit in front of the platen S, a cross-bar 7 of the apparatus being provided with members 1, 2 which have slots for resting on the platen shaft 60, and pins 1<g>, 2<g> for engaging slotted brackets 3, 4 on the carriage. The pin 1<a> is provided with a spring-catch 5. A guide-shoot 8, 9 for the account sheet K is secured to the bar 7, the part 9 depending towards the platen. Feed-rollers 17, 18, Fig. 12, at the bottom of the shoot, are carried by shafts 19, 20 mounted in fixed and pivoted brackets 23, 24 on the bar 7. Springs 25 are arranged between the brackets, and the shafts are geared together by means of pinions 21, Fig. 1. A dial 29 having apertures 29b numbered to represent line-spaces is revoluble on a pin 28, secured to a plate 27 on the bar 7, and is geared to the shaft 19 by means of a cross-shaft 33. The shaft 19 is provided with a drum 36 on which is wound the cord 39 of a spring drum 37 carried by the plate 27. A bell-crank 44, pivoted at 45 to the plate 27, is provided with fast and loose dogs 40h, 40, Fig. 3, for co-operating with projections 29d arranged at intervals corresponding to a linespace on the rear of the dial. Normally, the arm 44<a> of the bell-crank is held by means of a spring 46 in contact with a stop 52<a>, the loose dog 40 being in the path of the projections 29d. The stop 52<a> is formed on a slide 52 which is held in normal position by a spring 53. A bevelled tappet 55, Fig. 9, for co-operating with the arm 44<a> is pivoted on a lug 54 on the slide T of the line-spacing pawl L. The tappet can be set in either of two positions, determined by stops 54<a> and a retaining-spring 56, to engage either side of the arm 44<a>. The account sheet is dropped into the shoot, and the operator places his finger in the dial aperture corresponding to the line of the account sheet that is required to be brought to the printing line. He then turns the dial into a position determined by a finger-stop 30, the rotation imparted to the feed-rollers feeding the account sheet into superposed relation to a journal sheet J on the platen, and bringing the required line of the account sheet to the printing line. The journal sheet passes over an apron P associated with feed-rollers 61, 62. An apron 16 receives the bottom end of the account sheet. During movement of the dial, the spring drum is wound, and the projections 29d click over the dog 40 until the movement is complete, whereupon the dog co-operates with one of the projections to retain the dial and feed-rollers. If it is required to eject the account sheet after one line has been typed, the tappet 55 is set in the position shown in dotted lines in Fig. 9 so that on operation of the line-spacing lever H, the bell-crank 44 is rocked in the direction of the arrow II, the dog 40 is released, the spring drum rotates reversely the feed-rollers and dial, and the account-sheet is ejected. A latch 50 for retaining the bell-crank in displaced position until completion of the reverse rotation is moved into and out of operative position by means of a projection 29<e> on the dial. If it is required to type more than one line on the account sheet, the tappet is set in the position shown in full lines in Fig. 9, so that on operation of the line-spacing lever, the bell-crank is rocked in the direction of the arrow I and returned, and the fast and loose dogs 40h, 40 co-operate with the projections 29d in the manner of an escapement to permit steprotation of the dial and feed-rollers. The apparatus may include a depressible guideplate 10 for preventing the journal sheet J from entering the shoot 8, 9. The guide-plate is suspended from arms 11 on a rock-shaft 12 mounted on the bar 7 and provided with a crank 13 and an over-centre spring for raising and depressing the guide-plate. A lug 15 on the bar 7 co-operates with a slot in the guideplate to limit movement thereof. The lower edge of the guide-plate may serve as a lineindicator. Specification 418,500 is referred to.