Patent GB-190906384-A (GB)
Title: Improvements in Stereotype Plate Finishing Machines.
Inventor: NEWTON PHILIP ARTHUR
IPC: B41D5/00
Filed: 1909-03-17
Granted: 1909-12-02
Abstract: 6384. Newton, P. A., [Hoe, R.]. March 17. Printing-surfaces.-Relates to a machine for boring and trimming semicircular stereotype plates. The plate P is held during the operation of cutting- off the ends of the plate, on a carrier 1 on a shaft 2, which is driven by worm gearing 3, 4 from the transverse shaft 5 ; this is driven by skew gearing 7, 8 from the shaft 9, which is rotated by a belt 11 from the main shaft 13. The plate is held on the carrier by clamps 14, 15, which engage the extensions of the plate. The clamps are mounted respectively on pivots 24, 16 and are pressed into engagement with the plate by adjustable pieces 29, 21, on arms 20 mounted respectively on shafts 26, 18. The shafts 26, 18 are connected by links 33 to a yoke 32, which is connected at its centre to an operating- crank 41 on a shaft 40. The shaft 40 carries an arm 39, having a roller 38 which engages a cam 35, integral with a sleeve 34 and mounted on a loose sleeve forming a bearing for the shaft 2. The plate is clamped by elevating the operating-handle 37. Adjustment of the clamps for plates of different thicknesses may be made by mounting the roller 38 on an adjustable eccentric stud. The plate-wheel in position on the carrier abuts against the notched ends 45 of bars 43, which are connected to cranks 47 on a shaft 48 rocked periodically by a cam 50 on a sleeve surrounding the shaft 2, which is driven at half speed by a back gear. After the p'ate has been secured on the carrier, the pulley 12, by which the carrier is driven, is secured to the main shaft by the depression of the treadle 62, which, by means of an arm 60, moves the clutch member 52, feathered on the shaft, into engagement with the member 51. If the plate has not been properly clamped, the treadle is prevented from being operated by a cam 68 on the sleeve 34, which engages a roller on a lever pivoted to the end of the link 64. As the carrier rotates, the ends of the plate are severed by rotary cutters 70, driven by belt from the shaft 13. As the plate rotates teneath the cutters, it passes into a semicircular water-jacketed boring- bed 73, where it is secured by clamps 77, 79, operated from a bell-crank 92, 91 on a shaft 93. As soon as the plate is in the correct position, the bars 43 in the holder 1 are retracted by the cam 50, and at the same time a cam 100, on the half-speed sleeve with the cam 50, turns the shaft 93 and actuates the clamps 77, 79 to secure the plate in the boring-bed. On the continued rotation of the plate-holder 1, a knife 115, integral therewith, shaves the interior cf the plate, after which the clamps 77, 79 are released by the cam 100, and the bars 43 ejected by the cam 50 to remove the plate from the boring-bed. The whole machine is then automatically stopped. For this purpose, the shaft 56, controlling the clutch 51, carries an arm 58 which is connected by a rod 116 to an arm 117 on the shaft 118. This shaft is rocked at the end of a cycle, i.e., after two revolutions of the carrier 1, by a spring 137, at an instant determined by a depression in a third half-speed cam 110, coacting with which is a roller 124 on a lever 122 connected by a link 121 and an arm 120 to the shaft 118. To ensure positive stopping of the machine, there is provided a pivoted stop 129 adapted to engage a recess in a disk 127 on the shaft 5, and flexibly connected to a rod 131 pivoted to the treadle 62. In addition to this, a brake, consisting of a drum 132 surrounded by a band 133 connected to an arm on the shaft 57, may be furnished. To allow the machines to be stopped in case of emergency, a sliding spring connexion between the arm 117 and the rod 116 is provided, so that, by depressing the treadle 63, the clutch 51 may be disengaged regardless of the position of the cam 110 the spring 138, and that surrounding the rod 131, yielding sufficiently to allow this.