Patent GB-636189-A (GB)
Title: Improvements in stereotype plate finishing machine
IPC: B41D5/00
Filed: 1946-12-16
Abstract: 636,189. Stereotype. WOOD NEWSPAPFR, MACHINERY CORPORATION. Dec. 16. 1946, No. 37041. Convention date, Sept. 10. [Class 100 (ii)] A machine for milling pockets in stereotype plates comprises a support for a semi-cylindrical plate, a plurality of cutters rotating about parallel spaced aligned axes, means for moving the cutters in unison laterally into simultaneous contact with the inner surface of a plate on the support, and means for rotating the cutters. The machine comprises a shaving section S, Fig. 2, described in Specification 536,814, milling section M and cooling and drying section C. Plates P are released from the section S by a rising and falling stop 102 actuated by a cam 103 on a main drive shaft 11, from the section M by a similar stop 1 actuated by a cam 21 on a shaft 23 coupled to the shaft 11, through a pivoted lever 18, and from the section C by stops actuated by cams on the shaft 23. If pockets are not required, the stop 1 is locked in the lower position by means of a knob, whereby the plate passes straight through the section M. The mechanism for lifting a plate into milling position against the liner 130 of a milling arch 140 is described in Specification 536,814, the lifting shafts being torsionally connected to equivalent shafts in the section S and rocked by a link 8 pivotally connected to a crank arm on each shaft and oscillated by a cam 10 on a shaft 126, driven from the shaft 11. The liner 130 has water cooling chambers 157. Milling the pockets. There are two batteries each of four cutters 25, Fig. 2, and 25<SP>1</SP>, Fig. 8, each battery being enclosed in a cutter bar 241 with cylindrical extensions 80<SP>1</SP>, 81<SP>1</SP> rotatable in bearings 82<SP>1</SP>, 83<SP>1</SP> in the machine frame' 15. The cutter bars are moved axially of the plate into alignment with the desired positions of the pockets by means of a cam groove 86 in a cam 36 on the shaft 23, which groove engages a roller 37 fixed to a transverse yoke 38 connecting the cutter bars. At the same time as they move axially, the cutters are rocked laterally into cutting position by means of rollers 40<SP>1</SP> on a bracket secured to the member 811 engaging a curved track 41<SP>1</SP> in a stationary cam plate 941 secured to the frame. The cutters are rotated by a motor 31 through shafts 30<SP>1</SP> and bevel gears 28<SP>1</SP>, 951, arranged so that adjacent cutters in a battery and also oppositely disposed cutters 25 and 25<SP>1</SP> rotate in opposite directions, whereby chips removed from the plate are thrown towards the axis of the plate and, directed downwardly by hoods over the cutter bars, fall on to a conveyer 139 driven from the shaft 23, and thence pass into a trough 138. To ensure that if the cutters are not rotating they are not rocked into contact with the plate, a control device O, Fig. 14, is provided comprising a vessel 248 filled with oil, a disc 249 therein driven by the motor 31, and a loose disc 250 carrying an electrical contact 252 and biassed by a weight into a position where this contact is out of connection with a stationary contact, the contacts being closed on rotation of the motor 31 by the torque produced between the discs through the oil. The contacts are in the supply circuit of the motor driving the main shaft 11 which is thus stopped if the motor 31 stops. Lubricating the cutters. Lubricant for the cutters is supplied through pipes 159, Fig. 17, 168, 169, Fig. 2, from a lubricator L actuated to supply oil to the cutters when in milling position by a spring-retained supply lever 160, Figs. 17 and 18, oscillated by a rod 162 actuated by one of the lifting shafts 41. The amount of supply is controlled by adjusting the lubricator laterally to vary the stroke of the lever. In order to prevent the supply of oil if a plate is to pass through without milling the lever 160 is moved out of range of the rod 162 by the wedge-shaped end 173 of a lever 172 actuated through a rod 174 by the knob for locking the stop 1 in the lower position. Driving-arrangements. " Stop " and " Start " buttons are provided for the motor driving the main shaft, the " Start " button energizing a solenoid so as to close the motor-switch and a switch which on release of the button leaves the solenoid energized through a circuit including the contacts in the control device O, which circuit is broken on pressing the " Stop " button, whereby the solenoid is de-energized and the motor-switch is opened. Specifications 636,191 and 636,239 also are referred to. The Specification as open to inspection under Sect. 91 comprises also cooling and drying apparatus and means for controlling valves supplying air and water to the section C, described in Specification 636,239 referred to above. This subject-matter does not appear in the Specification as accepted.