Patent GB-636239-A (GB)
Title: Improved mechanism for cooling and drying stereotype plates
IPC: B41D5/00
Filed: 1946-12-16
Abstract: 636,239. Stereotype. WOOD NEWSPAPER MACHINERY CORPORATION. Dec. 16, 1946, No. 87/49. Convention date, Sept. 10, 1946. Divided out of 636,189. [Class 100 (ii)] A stereotype cooling and drying mechanism comprises a cooling and compartment, inclined means for carrying semi-cylindrical plates into and out of said compartment, an inlet stop which when retracted admits a plate into said compartment, an outlet stop which holds a plate therein and releases it therefrom when retracted, water and air supply ducts with openings for directing water and air on to a plate in the compartment, a continuously-operated control element for periodically retracting and extending the stops, and fluid supply means operable by the control element during the intervals between the retraction of the inlet and outlet stops to supply water to the water ducts during an initial part of the interval and to cut off the water supply and supply air to the air duct during the remainder of the interval. The machine comprises a shaving section S, Fig. 2, described in Specification 536,814, milling section M, described in Specification 636,191, and cooling and drying section C. Plates P are released from the section M and into the section C by a rising and falling stop 1 actuated by a cam 21 on a shaft 23 coupled to the main shaft 11, through a pivoted lever 18, and from the section C by stops 431 actuated by cams 44, 44<SP>1</SP> on the shaft 23 and pivoted levers 181<SP>1</SP>, the stops 431 being yieldable to cushion the shock of plates entering the section. Cooling the plates. The cooling section C comprises a lower casting 192, Figs. 2 and 6, with water-conducting depressions covered by perforated spray plates, whereby water is sprayed on to the inner surface of the plate, being conducted to the plates from a water supply valve through pipes 206, 196. The outer surface of the plate is sprayed from pipes 210 in a manifold 208 supported on extensions 209 of the machine frame, being led from the pipe 206 through pipes 212. The water drains into troughs 213 in the frame and is thence led through pipes 214, 200 to a drain 201. Drying the plates. For drying, after the water supply is stopped, air is passed from an inlet valve through pipes 203, 202 on to the inner plate surface and through pipes 217, 215 to the outer surface. This air is blown inwardly and rearwardly through holes in the pipe 215 and strips water from the plate as it moves out of the section. Control of air and water valves. The air and water valves are controlled by two solenoids and are opened in turn by means of a two-way switch controlling the solenoids and actuated by a cam on the shaft 11. In order to prevent fluid being supplied if no plate is in the section, a roller 47, Fig. 4, is provided between guide rollers 180 and biassed upwards by a counterweight 224 and arms 225, 222 and rod 220, whereby the plunger 226. of a switch 79 in the supply circuit to the solenoids is depressed to open the switch. The valves can only be opened if the switch is closed by depression of the roller 47 by a plate. 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 a control device O, which circuit is broken on pressing the " Stop " button, whereby the solenoid is de-energized and the motor-switch is opened.