Patent GB-189820642-A (GB)
Title: Improvements in Engraving Machines.
Inventor: LOCK WILLIAM HENRY
Filed: 1898-09-30
Granted: 1899-09-30
Abstract: 20,642. Lock, W. H., Place, J., and Pashley, C. W. Sept. 30. Engraving.-Relates to engraving-machines, more particularly of the kind described in Specification No. 11,938, A.D. 1895, and partially shown in side elevation in Fig. 1. The work-holder V is secured to a reciprocating slide E', supported by a block F', which slides upon a fixed plate B<1>. The rotary tool-holders are mounted upon a standard I, and the tracer-rod D is connected by a ball-andsocket joint c to a bracket which is vertically adjustable upon a standard C. The slide E' is connected to the tracer-rod D by means of levers G, G', pivoted to the slide, and attached to links K, K<1>, which are connected to the rod D, as described in Specification No. 11,938, A.D. 1895. The levers G, G<1> are pivoted to a bracket H<1> secured to the standard B. Instead of the pin H being cylindrical, as described in Specification No. 11,938. A.D. 1895, it is provided with a conical head h, Fig. 6, and the shank h' of the pin H is fitted with a conical bush h<2> which is prevented from turning on the shank by means of a pin h<4> secured to the shank and fitting within a longitudinal groove formed on the inner side of the bush h<2>. Bushes h<5>, h<6>, respectively fixed to the ends of the levers G', G, fit closely upon the bush h' and head h. The shank h<1> is fitted -within a split bush screwed into the bracket H<1>, and is adjustably secured by means of a nut h<8>. The pivot pin P' of the lever G, Fig. 6, is secured to the sliding block P, and above this is a block R<1> having shoulders r which bear against the lever G. The block R<1> lies within a slot Q formed in the lever G, and is held upon the lever by means of a plate 3 and screws r'. Encircling the pin P<1> is a split bush r<2>, which can be adjusted to allow for wear by means of a nut r<5>. The pivot pin of the lever G.' is provided with a similar arrangement for taking up wear, An arrangement for allowing for the wear of the parts connecting the levers G, G<1> to the links K, K<1> is shown in Fig. 25. The lever G is formed with a slot a<2> having V-shaped ridges a' against which are fitted two dovetailed plates a, a<3>. The pivot pin is formed with a cylindrical shank a', which is encircled by a split bush a<8>, and with a conical head a<6>, secured to the link K by a screw a'. A nut a<13> is fitted upon the upper part of the bush a<8>, the lower part of which is conical. When the nut a<13> is screwed down, the bush a<2> is tightened upon the pin, and the plates a, a<3> are forced against the ridges a<1>. The joint between the lever G<1> and link K<1> is similar to that between G and K. Fig. 36 shows an arrangement for allowing for wear of the antifriction supports of the links K, K<1>. The links slide in grooves in blocks K<5>, and bear against antifriction rollers which are mounted upon studs K<7>, fitted in sliding blocks K<8>. These blocks are forced apart, in order to compensate for wear, by tapered pins K<11>, which slide through bushes K<13>, and are operated by means of a cross-bar K<12> and screw K<10>. The wear of the parts forming the ball-andsocket joint of the rod D is compensated by forming the socket of four coned races cut in four radially-movable bars which are forced towards one another by means of an arrangement of screws. Fig. 44 shows an arrangement of ball bearings for the reciprocating blocks E<1>, F<1>. The block E<1> is formed with three cavities e', which receive as many sockets F<2> carried symmetrically by the frame F<1>. The sockets are tapered internally, and within them are split bushes e<7> which fit over the ball-race bar e and balls e<6>. Wear between the parts is taken up by screwing a nut e<8> against its corresponding socket. The connections between the frame F<1> and plate B<1> are similar to those between the block E' and frame F<1>. Fig. 56 shows the manner in which the cutter or tool spindles are mounted. Each cutter spindle turns in bearings in a fixed bridge-piece 1, and a vertically-adjustable bridge-piece 4 ; this adjustment may be effected by means of a shaft 8 carrying pinions 9 which engage with racks 6 secured to vertical posts 3, secured to the piece 1 ; the shaft 8 passes through lugs projecting from sockets 5 on the piece 4, and is provided with a milled head 11. The adjustment of the bridge-piece 4 may be effected by other suitable means. The spindles 19 are mounted in tapering split bushes 26, which are fitted within correspondingly-tapered sockets 20 and held in position by nuts 27. The driving-pulleys 28 are secured between the nuts 27 and nuts 29. Upon the lower end of a spindle 19 is a disc 38, connected by pins 39 to a parallel disc 40 carrying the tool-holder 21, which rotates within a tapered bush 30 supported by a sleeve 44 connected to a collar 33. The arrangement of the discs 38, 40 and pins 39 conduces to dissipation of heat generated within the bearings of the spindles 19. The lower ends of the pins 39 fit loosely within holes formed in the disc 40. A means is provided for throwing out of gear any one or more of the holders 21. A further part of the invention relates to a chuck for holding matrix blanks to be cut, of the kind described in Specification No. 14,582, A.D. 1890. This chuck comprises a flat plate having depending plates between which the blanks are clamped. The chuck is held in a vice comprising a block, with frames having side pieces which slide upon the block, and a pair of vice jaws which move towards and from each other in a direction at right-angles to the motion of the frames. An arrangement is provided for gripping the blanks with a uniform pressure, the frames, and with them the vice jaws, being actuated by means of a spindle which works in conjunction with clutch mechanisms, one for each pair of vice jaws, serving to become disengaged as their corresponding blanks are properly gripped.