Patent GB-190212318-A (GB)
Title: Improvements in Engraving Machines.
Filed: 1902-05-29
Granted: 1903-04-16
Abstract: 12,318. Wise, W. L., [Goodnow, W. T, and Eaton, W. S.]. May 29. Engraving.-Relates to engraving-machines of the pantograph type, in which the tracer arm and engraving-tool arm are carried on a universallypivoted arm. The arm 2, carrying the tracer arm i and the tool arm k, is universally pivoted, by means of a cross-shaped piece g, between lugs 1 on an arm d, fixed by a screw e in a socket in the cross-piece connecting the standards b which are fixed in the base a. The pivots of the arm 2 on the piece g, and of the piece g in the lugs 1, are formed by conical pointed screws 3 entering conical depressions in the ends of the arms of the piece g. The arm i carrying the tracer is pivoted, so as to swing vertically, by point and socket pivots at the lower end of the arm 2. The tool arm k is similarly pivoted, so as to swing vertically, on a two-part bracket h, 14 clamped by a screw on to the arm 2, so that its height is adjustable. The engraving-tool o has a diamond point 31, and is fixed by a screw 30 in a holder n, Fig. 5, mounted rotatably in the sleeve m, a screw 35 being provided to prevent the rotation of the holder n when desired. The sleeve m is formed on the end of the part 24, Fig. 6, having a shank 23 passing through and rotatably fixed in the arm k by a conical nut 25 and lock-nut 26. The part 24 may be rotated in the arm k to vary the inclination of the tool o, and such inclination may be maintained by a lever p fixed at one end to the part 24, and at its other end engaging by a universal joint 37, an upstanding rod q having a universal joint connection 38 with a piece adjustably fixed in the slot 39 in the base. The joint 37 is adjustable up and down the rod q by a screw 40. Pressure may be applied to the graver by a lever r having a pull cord or chain 43. In order to lift the graver, the arm k engages a plate s hinged at 46 and raised by springs 51. The plate s is hinged on a bracket arm t adjustable on a standard b by a screw 53. The plate s may be depressed by an arm 48 and a rod u connected to a treadle. The bracket h has also a screw which may be turned to engage the arm k and hold it in raised position. The arm k is balanced by a weight or weights on a rearward extension 28. Any suitable means may be provided for securing the work to be engraved on the table v. The table is pivoted on a carriage w, and its inclination is regulated by a slotted arm 59 and screw. The carriage w slides across the front of the machine on a second carriage x movable on a guide y projecting forwardly from a cross beam z having end clamps with screws for fixing it at the required height on the standard b. The beam z and table &c. may be raised or lowered by means of a shaft 73 journalled in lugs 71 on the clamps and having pinions engaging rack teeth cut on the rear of the standards b. For engraving on the inner surface of a ring, a holder for the ring is shown in Fig. 13, and a tool of the form shown in Fig. 18 is used. The ring is held, as shown, between two jaws 83 having shanks 84 sliding in the annular holder 80, and moved inwardly by screws 85. The holder 80 is fixed in a two-part clamp 75 operated by screws 76. For holding a bowl of a spoon &c., studs, having grooves for engaging its edges, are placed in holes 77 in the required positions on the clamp 75. The tracer pattern 9 is secured by its lugs in the space 92 between jaws 90, 91 clamped together by screw bolts 93. The jaws are preferably mounted to slide longitudinally for bringing successive sections of the pattern into the range of the tracer. This is effected by T-headed clamping-bolts engaging a longitudinal slot in the underside of the jaw 91. When the bolts are loosened, springs raise them, and the jaw 91 is free to be slid along to the required position, after which the bolts are tightened to fix the jaws.