Advancing material of indeterminate length – Threading device – With means to pull lead-end
Patent
1986-10-29
1989-04-18
Watkins, Donald
Advancing material of indeterminate length
Threading device
With means to pull lead-end
226 91, B29D 701, B65H 5910, B65H 5920
Patent
active
048219355
ABSTRACT:
An improved apparatus for threading thermoplastic film through at least one forward stretching machine 23, comprising driven, stationary rolls 1 and driven, raised lift rolls 2. Each of the rolls 1 and 2 has an intake plate 4 on one of its front sides, which has a milled grooved 24 for the threading apparatus to pass through. The threading apparatus comprises a flexible rod 18 with a removably attached clamp component 13 or 25. The clamp components contain variously configured clamping elements, springs, and insertion slots. The clamping elements are arranged in such a way that they hold the film web 3, which has been inserted in them, during the transport of the threading unit through the forward stretching machine, this holding being done by means of self-locking or spring-loading. For the reliable introduction of the threading apparatus into the forward stretching machine 23, there is disclosed an insertion unit 31, having pairs of upper and lower guide bearings 19. The insertion unit 31 comprises a movable rod support 20, which makes it possible to lower the inserted rod 18 onto the rotating lower rolls 1, which then grip the rod and transport it through the threading channel, which is formed by the milled grooves 24 on the intake place 4 of all rolls 1 and 2.
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Clements Gregory N.
Hoechst Aktiengesellschaft
Watkins Donald
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