Patent GB-190126734-A (GB)
Title: Improvements in Apparatus for Engraving or Die Sinking.
Inventor: KELLER SIDNEY ALEXANDER
Filed: 1901-12-31
Granted: 1902-02-06
Abstract: 26,734. Lake, H. H., [Keller, S. A.]. Dec. 31. Engraving.-Relates to machines for engraving or sinking dies, more particularly machines such as described in Specification No. 8684, A.D. 1891. A side elevation of part of a machine is shown in Fig. 1, and the supporting-bracket on the left side of Fig. 1 in enlarged end elevation in Fig. 5, 2 representing the bed of the machine and 3 the bar or rod on which are mounted the spindles 4, 5 of the cutting-tool and tracer respectively. A shaft 10 is mounted in arms 9 on a base 8, and carries an adjustable horizontally-slotted plate 17 secured by a nut 21 and formed with lugs or posts 22, 23 fitting in bearings 15, 16 on arms 13, 14 of a swinging bracket 12, which is provided with a vertically-slotted plate 24 secured by a bolt 26, shaped at the lower end into a split sleeve or collar 27 for the bar 3, and adjusted by a screw 29. An arm 31 secured to the arm 13 is provided with bearings 32, 34 for a shaft 35 carrying a driving-pulley 36 and a pulley 37 connected by a belt or cord 38 to a pulley 39 on the spindle 4, the strain of the belt being always in a direct and vertical line with the bearings 15, 16. The free end of the bar 3 is carried in an ordinary bracket 40 provided with rollers 41, 42 and a supporting-bar 43. In a modified form of bracket, the pulley shaft is arranged in horizontal line with the shaft supporting the bracket. A spindle for carrying the cutting or engraving tool is shown in section in Fig. 14. A casing comprises parts 10<x>, 11<x> provided with oil cups 12<x>, 42<x> and connected by a yoke 41x, the part 10<x> being dovetailed in the upper section of a clamp portion 2x, 3<x>, and adjusted by a screw 7x. The spindle comprises an enlarged forward end 16<x> with converging sides 17<x>, a portion 30<x> tapering to a shoulder 18<x>, a reduced portion 19<x>, an enlarged portion 20<x> bearing in a stationary sleeve 22<x>, and a threaded portion 21x provided with a nut 28<x> and a lock nut 29<x>, which may be of sufficient weight to serve as a flywheel. A pin 27<x> on the portion 19<x> engages in a slot in a sleeve 25<x>, to which is secured the pulley 31 <x>. The tool 35x is held in a removable bushing 33<x> tapered to fit in a corresponding hole in the spindle, and is sharpened while in the bushing. A belt-shifting device is shown in Fig. 11, and is arranged for automatically reversing the direction of rotation of pattern and work after a partial revolution. The shaft 65 carrying the pattern 6 is mounted in a headstock 67, which is preferably fixed, and the shaft carrying the work is mounted in an adjustable headstock. Worm-wheets on these shafts engage a worm-shaft 76 carrying a speed polley 79 connected by a belt 81 to a speed pulley on a shaft 93. This shaft also carries two loose and an intermediate fixed pulley, over which a straight belt 91 and a crossed belt 92 from the main shaft 89 are shifted by an arm 105 of a lever 100. This lever is pivoted on an arm 101 adjustable in a vertical slot in a bracket 98, and is provided with a vertically-adjustable projection 103 adapted to be struck by two tripping-arms 87 adjustably secured in a dovetail groove 86 in a disc 84 on the shaft 65. Accidental shifting is prevented by securing to the lever 100 a casing 106 containing a hollow plunger 107, which encloses a spring abutting against an adjusting-screw 110, and carries a roller 108 adapted to engage either of two recesses in a plate 113.