Patent GB-838598-A (GB)
Title: Machine for finishing stereotype printing plates
IPC: B41D5/00
Filed: 1958-02-17
Abstract: 838,598. Printing surfaces. MIEHLEGOSS-DEXTER Inc. Feb. 17, 1958 [Feb. 19, 1957], No. 5094/58. Class 100(2) A machine for milling tension lockup pockets on the underside of a semi-cylindrical stereotype plate has a frame and means for supporting and clamping a printing plate on the frame, means for carrying a cutter in position to engage the underside of a plate clamped on the 'frame, and means for both powering the cutter and driving the cutter axially of the printing plate for cutting axially spaced tension pockets in the plate. The machine, which may form part of a composite plate casting and finishing machine, comprises a saddle 26 on which a plate P is clamped by clamos 33 as described in Specification 838,597. The frame 25 is provided with ways 35 for supporting a milling unit 32 having a pair of cutters. 30, 31, mounted on heads 37, 38. The ways 35 comprise rails 75 which support extensions 80 on each side of the carriage 77 of the unit 32. The milling heads 37, 38 are mounted for rocking movement on the carriage by shafts 83, 84. A drive motor 43 is suspended below the carriage 77 and drives a shaft 49 through pulleys and a belt 45. The shaft 49 is provided with a gear 100 which meshes with a gear 101 on a shaft 103. This gear meshes with. gears 104, 105 fast on the shafts 83, 84 respectively. Also on the shaft 84 is a bevel gear 106 which meshes with a bevel gear 107 on the shaft 90 of the cutter 31. The cutter 30 is similarly driven. The heads 37, 38 are connected by a link 113 so that rotation of head 37 about shaft 84 in one direction causes rotation of head 38 about shaft 83 in the opposite direction. Rotation of head 37 is effected by a link 115 connected to the head by a pin and slot connection 121 and provided at its other end with a cam follower roller 119. The follower 119 runs in track in a cam 118. The cam 118 has an advance track 125 and a return track 126, the advance track 125 having positions A, B, C, D corresponding to positions where sockets are to be milled. The roller 119 is constrained to advance in track 125 and return in track 126 by spring-biased cam switches 130, 132. The cam 118 is mounted on the frame 25 for lateral adjustment by a wedge spacer 141 which is movable vertically by a pair of screw type adjustments 142 located at both ends of the cam, The axial drive for the milling unit comprises a fixed drive shaft 151 mounted between transverse end frame members 154. The .shaft 151 co-operates with a nut 152 captive in the milling unit carriage. The nut 152 comprises a pair of segments 161, 162 spaced by spacers 163 and held together by bolts, and is supported by bearings 164 mounted in the carriage section 77. The segment 162 has teeth which mesh with a gear 168 in mesh with the driven gear 100. A container 67 is provided for collecting metal chips produced during milling. The chips are first collected in a collector 65 which comprises three telescoping sections 174, 175, 176. The section 174 is fastened to the milling unit carriage and is provided with a transverse pipe 194 having nozzles through which air may be blown. Section 176 is joined to the frame member 154 and has horizontal guides which engage complemental guides 181 on the middle section 175. The chips are pushed from the two sections 175, 176 by spacing blocks 183 attached to the sections 174, 175. To prevent chips from accumulating in the corner of the section 174, a curved guide plate 191 is provided. To contain the chips during milling vertical side guards and upper guards as 197, 198, 199 are provided.