Perfectionnements apportés aux procédés et dispositifs pour découper mécaniquement des pièces symétriques ou asymétriques épaisses dans des plaques en matière plastique cellulaire

摘要

979,322. Cutting foam plastic; sawing. F. KAISER. June 12, 1962 [July 8, 1961], No. 22543/62. Headings B4B and B5L. Symmetrical or other articles are formed from a sheet 2, Fig. 5, of foamed plastic by first cutting the sheet along a central plane by a travelling cutter strip or a band saw 6, immediately after a roller 16 has compressed the sheet into a mould 14 and then repeating the operation with the sheet inverted in the mould and the cutter and roller adjusted to lie in the same plane as the surface mould. The method is used to cut the lens-shaped article 1a, 1b shown at B, Fig. 5, from the sheet 2 by first causing the cutter to cut the sheet into the two parts 2x, 2y shown at A, Fig. 5, while the roller 16, which may be rubber covered, compresses the sheet into the mould 14 and the latter is moved with its carriage 13 at the same speed as the circumferential speed of the roller; the second cutting operation, which results in the lens-shaped element, is effected by inverting the part 2y in the mould and, with the cutter and roller adjusted as described above, feeding the mould under the roller and into the cutter. The drive of the roller and feed of the mould may be positively coupled to produce the desired effect. The cutter may be arranged at an angle to the direction of feed of the mould or the latter may itself be fed along an inclined plane. In a modification, cutting occurs when the roller and cutter are moved over the stationary mould. Unsymmetrical articles, such as synthetic sponges, may be produced in a mould which is of irregular shape in plan, is inverted for the second cutting operation, and receives base inserts of differently-shaped upper surfaces for the two operations. The Specification also describes two methods previously proposed of cutting articles, in one of which the sheet 2, Fig. 2, is fed between two shaped rollers 3, 3a to a cutter 6 and in the other a press 9, Fig. 3, is used to force a semi-lecticular part 1a of the sheet 2 through an opening in the mould 8 for cutting by a cutter 6.