Patent GB-190521854-A (GB)
Title: Improvements in Engraving Machines.
Inventor: JUSTICE PHILIP MIDDLETON
Filed: 1905-10-26
Granted: 1906-08-09
Abstract: 21,854. Justice, P. M., [" Long Arm" System Co.]. Oct. 26. Engraving.-Relates to an engraving-machine for engraving steel, copper, and other plates, by which the various characters may be reproduced with or without predetermined variations. The machine comprises a pedestal A, Fig. 1, on which is mounted a plate B, having a lug which depends into a slot in the top of the pedestal and carries two nuts, secured by clamps, adapted to engage a screw by means of which the plate B is adjusted. The plate B carries an upright B<1> and a yoke B<2> in which the tracer rod E is mounted. The tracer rod E, which is hollow and has a tracer rod E<1> telescopically mounted therein, is clamped by a screw in a sleeve F, mounted on pivots F<3> in an outer sleeve F<4>. The sleeve F<4> carries a feather f which engages a longitudinal slot in the ring F<5>, mounted by means of two pivots, at right-angles to the pivots F<3> in the yoke B<2>. The sleeve F<4> may be clamped in the ring F<5> by a screw F<6>. By moving the sleeve F along the tracer bar E, the ratio of reduction may be varied, or, by arranging the two sets of pivots in different planes, the reduction in the two directions will be different, thus producing condensed or expanded characters. The weight of the tracer rod E is borne by a roller g in a sliding link G, carried by a bar G<1>, which is at one end pivoted to a block G<2> and at the other connected to the block by a helical spring G<3>. The block G<2> is mounted to swing laterally on pivots g<2>. The tension of the spring G<3> may be adjusted to balance the tracer rod E in any position by means of a nut G<5> on the rod G<4>. At the end of the tracer rod remote from the copy is mounted a collar I', integral with a depending arm I pivoted to a T-piece K mounted on pivots L<1> in a link L. The link L terminates in a yoke L<2> in which is mounted a cross M, mounted on pivots n, n<1> in an axis at right-angles to the yoke L<2> in the eye N<1> of the frame N. A stop is provided to keep the frame N clear of the rod E. The frame N is triangular as shown in Fig. 2, and is mounted on pivots n<o> on a rectangular frame pivoted to the pedestal A. The frame N carries a yoke P, provided with screens p on which the graver holder Q carrying the graver Q<3> is mounted. An extension Q<4> on the graver holder Q is connected by means of a cord Q<5> to one arm of a bell-crank which is pivoted at N<6>, and one arm Q<7> of which carries a weight Q<8>, which normally tends to press the graver against the work held in the holder W. Pivoted in a bearing on the pedestal A is a bellcrank R, the vertical arm R<1> of which normally is kept in engagement with the extension Q<4>, to hold the graver away from the plate, by a cord R<3> attached to the arm R<2>. The other end of the cord R3 is secured to a bell-crank connected by a link to a treadle, which when depressed by the operator causes the cord R<3> to slacken, allowing the weight Q<8> to press the graver against the plate. The motion of the arm R<1> is limited in both directions by stops. The plate to be engraved is secured on a frame W, mounted on bolts W<2> in the pedestal A. The frame is provided with an extension W<1> which in the operative position of the frame bears against a leather or india-rubber faced link W<4> projecting between rods W<3> on the underside of the frame. The frame is swung outward to facilitate fixing the plate. The frame W is slotted at w<0> to receive nuts X<0> secured by clamps X' to a vertically-sliding frame X, which is adjusted by means of a screw W<5> and handle W<6>. The frame X is provided with an horizontal slot x<0> in which slides a similar frame Y adjustable by means of a screw X<5> and hand-wheel X<6>. The frame Y is provided with a fixed clamp Z<y> and a movable clamp Z which slides in a slot y<o> and is adjusted by a screw Y<5> passing through a nut secured by a clamp. The clamps Z, Z<y> are preferably provided with pins z for holding the plate. In a modified form of machine, in which a rotary motion given to the tracer rod is communicated to the cutting-tool, the tracer rod E is made hollow, Fig. 17, to receive a rod E<3>, which is telescopically connected to a hollow rod carrying the tracing-tool and having a pin which passes between the fingers of the operator. The rod E carries a collar I<1>, integral with an arm I carrying a yoke in which the horizontal member K<5> of a T-piece is pivoted. The vertical arm K<6> carries a sphere K<7>, perforated to allow of the free passage of the rod E<3>. This sphere is clamped between two spring plates N<10> secured to a frame N, previously described, which carries the graver holder. The plate Q<12> of the graver holder is provided with a bracket Q<13>, between which and the plate Q<12> is journaled a spindle Q<15>, carrying a spacing- collar q<15> and a set collar Q<16>, formed with a fork q<16> embracing a curved finger e' on the rod E<3>. The spindle Q<15> is also provided with a box Q<17> in which is secured the tool Q<8> formed with a diamond cutting- point q<18>. By these means, a rotary motion of the tracer rod E in following a curve on its axis is communicated to the tool Q<18>. The universal joint, comprising a sphere K<7> clamped between two spring plates, may be applied to the machine as originally described, or, if desired, the bearing first described may be substituted for the spherical bearing. The type or copy holder comprises a fixed and a movable board, the latter being provided with clamps for securing it. The characters are provided with lugs which are clamped between the two boards. The holder is provided with a rest for the operator's wrist. The operator sits facing the frame supporting the copy, with his back to the engraving-mechanism and with the tracer E passing over his right shoulder.