Drawing roller unit with scavenging means

Details Drawing roller unit with scavenging means Drawing roller unit with scavenging means

1991-04-26

1994-06-28

Leung, Philip H.

Electric heating

Inductive heating

With heat exchange

361694, 219645, H05B 614

Patent

active

053249054

ABSTRACT:
A drawing roller unit is constructed with a godet and an electric motor mounted on a common shaft. A passage is provided throughout the unit to convey a non-flammable scavenging gas through the motor and the godet to reduce the risk of explosion due to sparking by the electric motor and/or other electrical parts of the drawing roller. The gas introduced can leave the unit only through a narrow gap. The pressure of the gas is consequently above atmosphere pressure and prevents the entrance of air.

REFERENCES:
patent: 2761941 (1956-09-01), Ardichvili
patent: 3602746 (1971-08-01), Clair
patent: 3879594 (1975-04-01), Shillito
patent: 4005302 (1977-01-01), Graf et al.
patent: 4304975 (1981-12-01), Lenk et al.
patent: 4425489 (1984-01-01), Pav et al.
patent: 4464593 (1984-08-01), Kofink
patent: 4822972 (1989-04-01), Sugioka et al.
patent: 4859887 (1989-08-01), Carlsson et al.

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