Draw roller for the transport of a material web, particularly a paper web in a web-fed printing machine
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United States of America Patent
Stats
-
Jul 22, 1997
Grant Date -
N/A
app pub date -
May 2, 1995
filing date -
May 11, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The draw roller is designed as a suction roller with a rotatable roller casing having orifices, and the material web loops around the draw roller along a circumferential portion. The internal suction-air supply connectable to a negative-pressure source opens out on the inner circumference of the roller casing and is designed so that a stationary suction surface of wedge-shaped form is obtained on the casing circumference. The wedge tip is directed opposite to the direction of rotation of the roller casing and is located at the start of said circumference portion in the roller center. The suction surface widens obliquely outwards on both sides with an increasing looping angle and, at the end of the circumferential portion, has a width corresponding to the total width of the material web.
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