| 摘要 |
516,653. Moulding type &c. WINKLER, M., BAUSBACK, F., and STRUNK, E. July 4, 1938, No. 19778. Convention date, July 3, 1937..[Class 87 (ii)] [Also in Group XVI] In single or multiple moulds for casting type or other articles from thermoplastic materials, such as acetyl cellulose or synthetic resins, a feeder-head bar or mould, containing channels for conducting the casting-material from an injecting-nozzle to the moulds, is given a movement relative to the moulds for the purpose of shearing off the feeder-heads after the casting. As described in Specification 516,649 [Group XVI] the mould-cavities 5 are formed on two sides by blocks 28, and a third side is.formed by plates slidable between the blocks and serving to eject the cast types. The fourth side of the moulds is formed by an extension of the nozzleplate 1, and the ends of the moulds opposite to the nozzle are closed by matrices. The feeder-head bar 39 has tapered channels 40 leading from the nozzle to the moulds, and a passage 50 connects them with the aperture 3 in the nozzle. When the mould opens after the casting, the bar 39, which is controlled by a fixed cam 62, is moved endwise by a spring 61 to shear off the feeder-heads. The bar may then be given a movement in the opposite direction, in order to smooth the ends of the type. Ejectors are provided for pushing out the feeder-heads from the bar. When the moulds are arranged in a circle, the feederheads are shorn off by a turning movement of the feeder-head mould. Reference has been directed by the Comptroller to Specifications 27480/03, 11245/08 [both in Class 100], 22496/14 [Class 87 (ii)], and 106,602 [Class 100 (iii)].
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