Patent GB-189817200-A (GB)
Title: Improvements in or relating to Engraving Surfaces for Producing a Watered, Moire, or Ornamental Surface for Embossing, Stamping, or similar purposes.
Inventor: BOULT ALFRED JULIUS
Filed: 1898-08-09
Granted: 1898-11-19
Abstract: 17,200. Boult, A. J., [Avril, P. V., Soc. Marinier fils, and Navoit, E.]. Aug. 9. Engraving.-Relates to apparatus fori engraving rollers, plates, or the like, intended for use in obtaining water, moirÚ, or other ornamental effects by means of stamping, embossing, or similar operations. The engraving- machine comprises a fi x e d headstock, a poppet head for supporting the work, and a slide-rest for holding the burin; Fig. 3 shows a front elevation of the slide-rest, and Fig. 5 a front view of the headstock. The burin h is secured with in a block j fitted upon a dovetailed slide i which is adjustable, in a direction at right-angles to the plane of the paper, upon a plate b. By means of a graduated sector s and pointer r attached to the burin, the position of the cutting-edge may be readily found. The depth of cut made by the burin is limited by means of a screw t fitted within the blockj, and the burin can be thrown in or out of operation by mechanism comprising a spring-controlled hand-lever o which is pivoted to the plate i. The plate b is mounted upon two adjustable screws c, the points of which are fitted within conical apertures formed in a bracket a secured to a long plate L', attached adjustably by screws to a slide K' mounted on the machine bed B. An oscillating motion can be given to the plate b by means of a cam mounted upon a shaft Y', driven by gearing X', Z, Z', V<1>; the wheels Z, Z' are carried by a slotted sector T<1>, and the wheel V<1> is mounted upon a shaft O<1> provided with a crank handle N. The slide-rest K<1> is reciprocated by means of a bed screw G, bevel gearing B<1>, C<2>, and toothed wheel D<1> which drives a worm-wheel mounted upon the shaft O<1> so as to engage with the screw G. A dividing apparatus, employed for determining the number of grooves cut by the burin during a complete rotation of the cylinder mounted within the work-holder M, and also the required variation in the intervals between successive grooves, is shown in Figs. 5 and 6. An arm J' carrying a cam-piece Q of suitable shape is pivoted to a bracket fixed to the headstock P. The cam-piece is forced by a spring against a series of removable pins d<4> fitted in the face of a disc D, in front of a toothed wheel C, both being keyed to the shaft A. A handle B<2> carrying a knife-edge, adapted to engage with the teeth of the wheel C, is supported by the points of two screws fitted to an arm E mounted loosely upon the shaft A. The lateral movements of the handle B' are limited by a prong M' carried by a wheel H which is loosely mounted on the shaft A ; the handle B' is provided with a stop R' which strikes alternately against one side of the prong M', and a screw fitted adjustably to the opposite side of the prong. By suitably operating the handle B', the wheel C, and with it the work to be engraved, can be rotated through any desired angle. When it is necessary to cut equidistant grooves, the pins d' are removed from the disc D. Helical lines of any pitch and equidistant or other circular lines may be traced upon cylinders by employing a suitably-modified form of dividing-apparatus. By using a special form of work-holder, the machine can be adapted for engraving plates for use in stamping &c. The screw G may be replaced by a longitudinallygrooved rod working in conjunction with a worm and rack, or a toothed wheel and rack.