GB873543A - Improvements relating to machines for casting curved stereotype plates - Google Patents

Abstract

873,543. Printing surfaces. LINOTYPE & MACHINERY Ltd. Oct. 2, 1959 [Oct. 6, 1958], No. 31774/58. Class 100(2) In a machine for casting curved stereotype printing plates of the type wherein the plate is cast from a matrix in a mould chamber between a curved core and an arched back both of which have cooling fluid jackets, the jacket of the core houses means for supplying cooling fluid thereto through a plurality of jets so disposed as to promote fast cooling fluid flow through the core jacket and agitatory cooling fluid currents over substantially the whole cooling surface of the core jacket while maintaining the core jacket in a filled condition. The water jacket 13 of the core 11 contains a number of tubes 16 the lower ends of which are secured in the base of the core and open into a manifold 21. Each tube 16 is formed with a number of saw-cuts 27 and is closed at its upper end. When water under pressure is fed into the manifold 21 at 20 water jets out of the saw-cuts 27 and impinges on the outer wall 17 of the core at an oblique angle. The water leaves the jacket 13 via a manifold 24 at the upper end of the core where it is led away by a pipe 25. In a modification the tubes 16 have holes instead of the saw-cuts 27.