Patent GB-191507202-A (GB)
Title: Improvements in or relating to the Casting or Production of Elements of Printing Forms.
Inventor: KNIGHT AMOS LESLIE
IPC: B41B5/12
Filed: 1915-05-13
Abstract: 7202. Knight, A. L. Oct. 3, 1914 [Convention date]. Single-type composing and casting machines, convertible for casting leads etc.; matrices; moulds; metal pots; trimming type bars. - Relates to a machine for casting rules, leads, quads, and like elements of printing- formes in indeterminate lengths adapted to be subsequently cut up into particular lengths as required. The invention is shown as applied to a type-casting machine such as that described in Specification 8633/99. The mould, matrix-carrier, and centring - mechanism of that machine being replaced by parts necessary to the present invention. The rules &c. are produced by successive casts in a mould, the solidified strip after each cast being moved forward relatively to the casting cavity so that only the end portion is exposed to the molten forms the mould cavity. The side blocks are positioned by a packing-plate 17, thickness pieces 13<a>, 14<a>, Fig. 8, and a clamping-screw 18. Amould blade 27, of a thickness corresponding to the element to be cast, forms the end wall of the mould cavity, and after each cast pushes the solidified rule &c. strip forward, and is afterwards retracted to form a cavity for the succeeding cast. The matrix 21 is held between an abutment-piece 23, Fig. 9, and the faces 25<a> of a clamping-piece 25. Between the two parts 9, 10 of the side block is a triangular cavity 12 opening into the mould cavity. Air and a portion of the molten metal escape into the cavity 12. A tongue 28, attached to the mould blade and fitting into the cavity, acts as a pusher to eject the sprue so formed. The end of the mould blade is curved backwardly near the upper part. This gives a backward curve to the end of congealed element, which facilitates fusion with the metal of the next increment injected. To facilitate the flow of metal along the end of the previously cast section, the nozzle of the melting- pot is slightly inclined. The ejected rule &c. strip passes through a friction clamp 43, 45, Fig. 3. The part 45 is spring-pressed, the pressure being adjusted by a screw- 48. A curved blade 44 carried by the part 43 shears off the side sprue as the strip is ejected. The mould is built up as shown in Fig. 3, tie-bars 5 forming abutments for the ears 13, 14 on the side blocks. The pressure screw 18 is periodically operated. The mechanism metal of the succeeding cast, to which it becomes attached by fusion. The mould described comprises a base 3, Fig. 9, having upstanding walls 4, and side blocks 8, 9, 10, the space between which for effecting this may consist of a lever 19, Fig. 2, spring link 52, and arm 50 bolted to the lever 58 which ordinarily operates the centring-pin. The mould blade is operated through a spring-box 39 from the ordinary type-carrier, operating lever 246. A stop 33, Fig. 8, limits the forward movement of the blade. For casting low leads or quads, the mould cavity may be reduced in height, a filler blade of a thickness corresponding to the thickness of the mould blade and carried in a suitable holder being substituted for the matrix, and the mould blade reduced in height to correspond. A matrix having the required character or pattern or a plain surface may be used, one having two grooves to form two printing-lines on the rule being described.