Heating – Advancing structure flexing – looping or coiling sheet – web...
Reexamination Certificate
2007-06-05
2007-06-05
Wilson, Gregory (Department: 3749)
Heating
Advancing structure flexing, looping or coiling sheet, web...
C242S474400
Reexamination Certificate
active
10997839
ABSTRACT:
An apparatus for guiding, treating, or advancing at least one yarn (1), comprising a delivery roll (2) and a companion roll (3) cooperating with the delivery roll so that the yarn repeatedly loops the delivery roll (2) and the companion roll (3). The delivery roll and the companion roll are driven by associated electric motors (7, 8), which are controlled via control lines (9) at a desired frequency by a controller (10). To enable an equalization of the circumferential speeds of the delivery roll (2) and the companion roll (3), the electric motor of the companion roll is an asynchronous motor that is controlled by the desired frequency and has a motor slip.
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Saurer GmbH & Co. KG
Wilson Gregory
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