Patent GB-190321971-A (GB)
Title: Improvements in Paper-feeding and Stencil-printing Apparatus.
Inventor: JACK JOHN HENRY
Filed: 1903-10-12
Granted: 1904-08-11
Abstract: 21,971. Jack, J. H., [Dick & Co., A. B.]. Oct. 12. Feeding sheets; copying documents.-Relates to apparatus for feeding successive sheets of paper from a pile to a printing or other mechanism, particularly for use in connection with stencil duplicating-mechanism. The pile of paper is laid upon a feed-board N, Fig. 1, and pushed forwards until it rests upon the auxiliary feed-roll L, Figs. 1 and 5, and the intermittent feed-roll E. The auxiliary feed-roll has a fluted surface and is driven by gearing from the feed-roll E. The shaft e, Fig. 6, of the feed-roll is driven intermittently by a small stop wheel e<2> which is actuated by a wheel a<3>, Figs. 1 and 6, which has teeth along a portion of its circumference. The small wheel e' has an ear e<3> which has a concave surface fitting the wheel a<3>. The latter wheel is provided with notches a<5>, a<6>, each forming shoulders on the periphery of the wheel. When, during the revolution of the wheel a<3>, the notch a<6> reaches the ear e', the edge of the latter enters the notch, so that the wheel e<2> rotates with the wheel a<3> until the ear is brought against the other notch, whereupon the concave surface of the ear again slides over the periphery of the wheel a'. The forward edge of the pile of sheets is curved by the paper-stops i, Fig. 5, the stops just allowing the bottom sheet of the pile to pass between them and the roller E. The rest of the sheets are kept back by continuously - rotating rolls I. The bottom sheet of the pile is passed forwards between continuously - rotating rollers C, M. The gravity rollers M have milled surfaces, and are carried by a shaft m journalled in hangers which are pivoted at m<1> to arms which depend from a cross-bar F. After the sheet has passed from the rollers C, M, it is fed towards the printing-apparatus by passing rolls D, Fig. 1, and guide-wheels d<2>, which project partially through the bed-plate of the machine. The rolls D and wheels d<2> are provided with pulleys which are driven by belts from the shaft of the roll C. In a modification, the paper-stops are in the form of blocks, each of which is provided with a pin which works in a slot in the lower end of an actuating- lever. The upper ends of the levers are slotted to engage with pins on a crank shaft extending across the machine. Two pairs of stops are employed, and they are faced with rubber or other material. The two extreme stops hold the pile stationary while the intermediate stops advance the lower sheet, and vice versÔ. In another arrangement, instead of the actuating-levers, horizontal bars connected with the paper-stops are pivoted to bars which terminate in rings which embrace and are actuated by cams on a transverse shaft. In another arrangement, the paper-stops are in the form of pivoted semicircular shoes, each provided with a segmental gear which engages with a similar gear on the end of a lever the other end of which is actuated by a cam. The printing- apparatus and the feeding-apparatus are driven from a common source of power by a sprocket chain. The stencil sheet is mounted over a pad on a perforated diaphragm D, Fig. 15, carried by two heads C mounted on short shafts c<1>, and rotated by a gear wheel E. The paper is printed between the stencil-sheet and a pressure-roller I carried by hinged arms J having curved projections at the ends which engage with cams K. The camshaft k may be rotated by a hand-piece k<1> to depress the roller I when desired. The roller is urged against the surface of the printing-drum by springs L, the tension of which may be adjusted. The sheet, on being fed to the printing-mechanism, comes against the vertical edges m<3> of a combined paper-stopper and stripper, which ensures that printing starts at the right place. The stopper consists of a pivoted bar m having arms m<1> which terminate near the pressure roller, and are provided with downwardly extending webs having approximately vertical edges. At the upper and lower corners, each arm is provided with star-wheels m<2>. The bar m is actuated by a lever O which has a sheave o<2> which is operated by a cam P on the drum. The sheave passes clear of the cam just before printing starts, and the stopper is then lowered by springs N to the stripping position, in which the upper star-wheels come between the printed sheets and the drum, stripping the sheet off. The star-wheels prevent the arms from streaking the sheet. Ink is applied to the interior of the drum by a brush, inking- roller, or other means. A cyclometer secured to the framing has its spindle extending inwards towards the drum. A lever t<1> on the spindle is operated by a pin on the gear wheel E, the return movement of the lever being effected by a spring t<3>. A link t' is pivoted at one end to one of the arms J, its other end being pivoted to the lever t<1>. When the arms J are lowered by the hand-piece k<1>, the upper end of the lever t<1> is thrown out of the path of its operating-pin, so that only the actual printing operations are recorded. The printed sheets are delivered over a plate having a concave surface which curves the sheets longitudinally thus obviating the tendency of the sheets to fold transversely.