Patent GB-190519333-A (GB)
Title: Improved Combination Apparatus for Finishing Curved Stereotype Plates.
Inventor: HOPKINS CHARLES EDWARD
Filed: 1905-09-25
Granted: 1906-09-20
Abstract: 19,333. Hopkins, C. E. Sept. 25. Lathes; milling.-Relates to a machine for trimming the longitudinal and curved edges, and shaving the concave surfaces of curved stereotypeplates. The machine comprises a frame 1, Figs. 2 and 3, mounted on two standards 2, connected at the bottom by a frame having bearings 4, in which is mounted the shaft 5, carrying the pulleys 6, 7, 8, 9, the former of which serves for driving the machine. In bearings 10, 11 in the frame 1 is mounted a cylinder 13 having on its periphery a worm-wheel 14 adapted to gear with a worm 15 on a shaft 16, which is mounted on a bearing 28 formed on a yoke 29 pivoted on a shaft 5. The upper end of the shaft 16 is journalled in a box 17 capable of sliding in a guide 18, and is supported on a cam 19 on a shaft 20 carrying a hand-lever 22. The shaft 20 also carries a crank 23 connected by means 'of a link 24 to an arm pivoted on a bracket 26 and adapted to be engaged by a projection 27 on the cylinder 13. The shaft 16 is driven by worm-gearing 30, 31 from the shaft 5. Inside the cylinder 13 are two longitudinal ledges 32, 33, the formr of which is fixed and the latter is carried on arms 34 of two bell-cranks pivoted on brackets 36 on the outside of the cylinder, the arms 35 of which are provided with rollers 39 adapted to bear, as the cylinder completes a revolution, on stationary cams 40. The ledge 33 is normally pressed upward to secure the curved stereotype, against the inside of the cylinder 13 by a spring 37. Extending through the cylinder 13 is a stationary bar 42 to which is secured by means of screws 44, 45 a shaving-knife 43, which, as the cylinder 13 revolves, trims the concave surface of the stereotype. The bar 42 also supports brackets 46 in which are mounted rollers 47, 48, 49, adapted to bear in the plate 38 as the cylinder revolves. At each end of the cylinder 13 are mounted two shafts 51, which carry rotary, cutters 52, 53, respectively, for trimming the curved edges of the stereotype plate 38. These cutters are rotated by crossed belts 55 from the shaft 5. The plate to be trimmed is placed on a plate 60, formed with ledges 61, and is conveyed towards the cylinder 13 by projections 90, on an endless belt 85, which project through a slot 84 in a stationary bar 62, the belt being operated by turning a handle 89. As the plate moves forward, the straight edges are trimmed by rotating cutters 57 on a transverse shaft 56, operated by a half-crossed belt 59 from the shaft 5. As soon as the plate has been moved into the cylinder 13, the handle 22 is operated to throw the worm 15 and worm-wheel 14 into gear. As the roller 39 moves clear of the cam 40, the plate 38 is secured by the ledge 33 and is held thereby during the continued rotation of the cylinder, when the inner, surface and the, curved edges are trimmed by the kuife 43 and rotary cutters 52, 53, respectively. As the cylinder completes its revolution, the projection 27 comes into contact with an arm, disengaging the worm gearing 14, 15, and the roller 39 engages the cam 40 allowing the trimmed plate to drop on to the bar 62. The plate is then moved along guides 64 in a. table 63 to a horse or saddle, when it may be touched up by hand when necessary. The saddle 65 is pivoted on a vertical spindle 67 on a bracket 66 and is provided with a fixed stop 68 and a pivoted stop 69, connected by a link 71 to an eccentric pin 72, by which means, when the saddle is rotated, say through 90, the plate is gripped between the stops 68, 69. In a modification, the saddle is supported on a pedestal and the movable stop is operated by a rack-bar which engages a fixed pinion on the pedestal. A stop operated from a treadle may be provided to secure the saddle in either position. Instead of operating the cam 19 by a lever 22 as described, a foot-lever may be provided for the purpose ; further, the movable ledge 33 may be dispensed with, the rollers 47, 48, 49 and the ledge 32 being relied upon to hold the plate stationary within the cylinder.