| 摘要 |
A conveyor belt system comprises a main conveyor belt mounted about rollers and moveable to carry a web from an infeed area. The belt is porous and air is drawn from a vacuum box underlying the belt to create a pressure differential across the belt to hold the web in position. The position of the web in the infeed area is detected by a detector which is used to control the cross-belt which lies between the web and the conveyor belt. By transfers movement of the belt the position of the web can be maintained at a desired location relative to the belt. The use of a web as a position control member is more effective than the use of edge guides, particularly for thin or soft web materials.
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