| 摘要 |
The toothed belt is produced in a moulding cavity, which is defined by a rotating moulding wheel and an endless moulding belt, which is also rotating . For this purpose, the moulding wheel has a channel defined by lateral cheeks , in the base of which are provided recesses, which correspond to the teeth of th e toothed belt. The moulding belt surrounds the moulding wheel over a proportion of its periphery and engages the lateral cheeks at that point. Th e polyurethane, of which the toothed belt is to consist, is injected into the inlet of the moulding cavity. Upstream of the inlet, "lost cores" are introduced into some of the recesses in the moulding wheel corresponding to the teeth in suc h a manner that they are embedded all around in the polyurethane. After finishin g the toothed belt the "lost cores" can be removed. Passages remain which can be used, for instance, for mounting fastening elements.
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