Advancing material of indeterminate length – By intermittent material-mover – Comprising material-moving roll
Patent
1976-10-21
1978-03-07
Coan, James F.
Advancing material of indeterminate length
By intermittent material-mover
Comprising material-moving roll
93 33H, 226143, B31B 110
Patent
active
040773060
ABSTRACT:
This application discloses an apparatus for preventing heat damage to thermoplastic web material being converted to produce bags. After a selected number of bags have been made, the web feeding rolls are automatically stopped for a short period, which may be for one or more machine cycles or stopped for an indeterminate period on command of the operator, to allow removal or transfer of a completed stack of bags. When web movement is stopped, the web feeding rolls that are driven by a belt, are rotated in a direction opposite to the feed direction to withdraw the leading edge of the web from the plane in which the heated seal bar reciprocates. Withdrawing of the web occurs by applying additional tension to that reach of the belt which will effect reverse rotation of the feeding rolls. Such additional tension is created by freely rotating pulleys mounted on a plate oscillated by an actuator.
REFERENCES:
patent: 3541929 (1970-11-01), Crawford et al.
patent: 3813998 (1974-06-01), Lotto
patent: 3884129 (1975-05-01), Monahan
patent: 4003298 (1977-01-01), Schott, Jr.
Coan James F.
FMC Corporation
Pizzanelli L. J.
Tripp C. E.
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