Patent GB-444249-A (GB)
Title: Improvements in typographical slug-casting machines
IPC: B41B11/52
Filed: 1934-09-17
Abstract: 444,249. Type-bar-making machines. CLEMO, F. A., 9, Kingsway, London.- (Mergenthaler Linotype Co. ; 29, Ryerson Street, Brooklyn, New York, U.S.A.) Sept. 17, 1934, No. 26604. [Class 100 (iii)] Metal - pots.-A metal pot having a throat section formed with a passage terminating in a plurality of superposed rows of discharge openings, through which molten metal is adapted to be forced into a common mould cavity, is provided with means arranged in the passage of the throat section for diverting the metal flowing through the passage into different paths of flow to the rows of openings. The metal-pot mouthpiece G<4> is formed as usual with a plurality of superposed discharge openings g which align with the mould slot C<1>, so that the lowermost row of openings is always in alignment with the slot, but the upper row may be shut off from the mould slot by the movable mould cap c<1>unless casting thick ribbed slugs. The openings g in the upper row or rows are more widely spaced than in the lowermost row. The delivery passage G<5> of the metal-pot is provided with a wedge-shaped member J arranged as shown in Fig. 2 and tapering rearwardly to form two separate channels G<1>, G<8> leading directly to the upper and lower rows of openings g which form straight line continuations of the channels, whereby eddies are prevented in the molten metal. The inner face of the mouthpiece G4 is formed with a series of flared recesses G<10>, Fig. 3, each communicating with an opening g to eliminate further the flat walls of the mouthpiece and any eddies which result therefrom. The wedge-shaped member J may be fixed or movable in the delivery passage. In the latter case it is mounted on trunnions so as to pivot about its pointed end and one trunnion is continued through the wall of the throat section and is provided with a crank-arm which carries a spring-pressed detent engaging notches or holes in a fixed side-member. The wedge may thus be moved to various positions relatively to the mouthpiece and may be locked in any desired position, the wide end of the wedge and the inside of the mouthpiece being similarly curved so that the wedge may seal either the upper, the lower, or neither of the rows of openings g, Fig. 2, or where several of these rows are provided may seal one or more of the rows, as desired. In a modification, particularly adapted for preventing back suction when withdrawing the metal-pot after casting, the wedge-shaped member J is mounted on a slide in the throat section and is automatically operable to seal and unseal the discharge openings g. The slide is spring-pressed to the position in which the openings are closed, but the upward movement of the justification rod to justify the composed line operates through linkage and a spring to move the slide downwards whereby the openings g register with the passages G<7>, G<8>. After casting, the justification lever is lowered and this movement raises the slide carrying the member J so that the latter again seals the openings g and, when the metal-pot is withdrawn, no back suction of air into the delivery passage takes place.