Patent GB-190125373-A (GB)
Title: Improvements in Stencil Printing Apparatus.
Inventor: GESTETNER DAVID
Filed: 1901-12-12
Granted: 1902-01-30
Abstract: 25,373. Gestetner, D. Dec. 12. Copying documents &c. - Relates to improvements in the apparatus described in Specification No. 23,406, A.D. 1900. Fig. 1 shows a sectional elevation of the machine. Two rollers a, a* are mounted in side frames b, the lower one on a fixed shaft a<1>, and the upper one on a shaft in bearings mounted in slots b<2> and pressed upwardly by springs. Around the rollers a, a* are passed two endless bands c, preferably of steel, one at each end of the rollers. Studs a<5> on the rollers engage perforations in the bands to prevent slip. Motion is given to the rollers and bands by a hand-lever geared to the roller a. A sheet of porous material d, preferably Yoshimo paper, is secured between the bands c, at one end by means of a metal bar secured to the end of the porous sheet, which is strengthened by cementing thereon a stronger material. The metal bar has keyhole slots which are passed over studs c<3> on a bar c' fixed to the bands c. The other end of the porous sheet is provided with a pocket of stronger material, through which is passed a bar e the ends of which are connected to springs e<3> connected at their other ends to lugs e' on the bands c. The bar e has rounded projections which engage holes in the pocket of the porous sheet. The porous sheet is made impervious at its ends to keep the ends of the stencil free from ink. The paper stencil f is attached at one end to the bands c, and is then laid smoothly over the porous sheet, to which it is caused to adhere by the ink. The end of the stencil is clamped by a trough-shaped clamp f<3> on to a bar f<1> fixed at its ends to the bands c. The clamp f is fixed, when in place, at one end by engaging an under out part of the bar f<1>, and at the other end by a spring bolt. The rollers a, a* are recessed near each end inside the bands c, to prevent ink from spreading to the hands c &c. Ink is supplied to the rollers a, a* by waver rollers'g, in bearing-blocks mounted in slots in the ends of a pair of levers pivoted at about their centres. The bearings are drawn towards each other, to press the rollers g up to the rollers a, a*, by springs. One of the levers is rocked, to move the rollers g longitudinally, by a lever operated from an eccentric on a cam shaft driven from the roller a. The impression roller j has its shaft mounted in slots j<1> in carriers j<2> rigidly connected together by. a bar j<7> and supported by springs j<3> resting on swivelling rings j<4> on arms .j<5> pivoted at j<6>. Rods j<8> on the carriers j<2> project through the springs j<3> and rings j<4>. The carriers j<2> are controlled in their up-and-down motion by arms j<9> pivoted to them and to the framing. The roller j is lifted, to press the paper against the stencil on the roller a, by a hook engaging a pin on one of the arms j<5>. The hook is pivoted on a sliding plate mounted on one of the side frames and operated by a reciprocating wedge connected to a lever operated from a cam on the cam shaft. This wedge lever has its pivot on a block adjustable by a screw, so that the impression roller may be brought sooner or later into printing position. The hook on the sliding plate is connected by a link to an eccentric, which may be operated to throw the hook out of position for engaging the pin and lifting the roller j. In this position a foot-piece pivoted on the lifting-plate engages the shaft n<3> and holds the plate in its raised position, until the eccentric is operated to bring the parts again into operative position. The paper stop n is carried by arms n<1> having slots engaging the shaft n<3>. On the shaft n<3> are cam-levers operating pins on the arms n<1>, first to lift the stop n from the roller, and then to move it back to its rearward position. An incline in the lifting-plate operates a roller on one of the cam-levers on the shaft n<3>. An adjustable side gauge q is mounted, free of the feed table r, upon a transverse rod. The feedtable r is removably held in trough-shaped guides r'. Springs q<2> on the rod act to keep the paper down on the table r. A receiving-tray s is mounted telescopically so that it may be pushed under the machine when out of use. A counter of any suitable construction is operated by a link connected to one of the arms j<9>. Wedge-shaped plates u, u<1> are mounted on the side frames b, and, when the cover is placed on the machine, it pushes the plates down so that they engage the shafts g<1> of the rollers g and move the rollers out of contact with the rollers a, a*.