Patent GB-190002362-A (GB)
Title: Improvements in and relating to Machines or Appliances for Making Stencils.
Inventor: SMITH HOWARD FOSTER
Filed: 1900-02-06
Granted: 1900-04-28
Abstract: 2362. Smith, H. F. Feb. 6. Type-writers and like muchines.-A punching-machine for use in making stencils is shown in plan in Fig. 1 and in sectional view in Fig. 12, the section being taken along the line 12-12, Fig. 1. The punches F are mounted within apertures c formed in a wheel C, which is secured concentrically to a die-plate D having apertures d which register with the apertures c. The wheel C and die-plate are secured to a pinion e, and are mounted to rotate upon the reduced part b<1> of a hollow post b which is formed with vertical slots b<2>. The pinion e engages with a toothed segment G, which is pivoted at a<5> to the framing and is attached to a handle-bar G' carrying a spring- pressed pointer g<1> arranged to engage with notches formed in a bar a<7>. Each punch F comprises a tubular body having its ends closed by screw plugs f<1>, f<2> and provided with a coiled spring f for raising the punch after every down stroke; the punch is fitted by means of a spline and groove within its aperture c. A stripping- plate d<11> is secured to the lower side of the wheel C. When the punch wheel C has been rotated so as to bring any desired punch into register with a tubular anvil H, the punch may be depressed, so as to punch out a letter or character from the stencil, by a hammer I attached to a lever I', which is mounted upon a bracket K and is actuated by means of a hand-lever J ; this lever is pivoted at j to the framing, and is connected to the lower end of a rod i which is pivoted to the lever I'. The paper or other material from which the stencils are made is fed intermittently by two rollers o, of which only one is shown in Fig. 1, these rollers being actuated by means of a pawl and ratchet mechanism connected to a crank arm M, which is connected to the lever I' by means of a link P, bell-crank lever L and link l<1> of adjustable length ; the lever L is pivoted to the bracket K at k<1>. The upper feed-roller o is mounted in movable bearings, and can be raised by means of a crank arm so as to allow a strip of material to be inserted. The paper or other material may be drawn from a roll p removably mounted upon arms p<1> of the framing and provided with guiding-flanges p<2>. The material is moved transversely so as to allow a fresh portion or strip to be perforated, by means of a hand-bar q<2> carrying a forked arm q which engages with a collar q<1> on the shaft of the roll p ; the bar q<2> is locked in position by spring buttons, and carries guide-fingers q<5>. When a wide letter, such as M, is to be punched, the material requires to be fed through a longer distance than is required when a narrow letter, such as I, is to be formed, and, in order to effect the necessary adjustment of the feed, a cam of suitable form is mounted loosely upon the shaft of the lower feed roll, and is revolved so as to disconnect the ratchet and pawl for the space of time necessary. The cam is actuated by means of a lever r, which is pivoted to the framing, and engages with suitably-arranged projections and depressions formed on the underside of the die-plate D.