| 摘要 |
A packaging machine that uses cylinders to automatically adjust the pressure gradient on a web feed roller system is presented. The cylinders are controlled by an air operated or an electrical sensing device that senses the edge of the web. When the sensor detects the web rising it will increase the pressure on bottom of the feed rollers and lower the pressure at the top. This action drives the web down. When the web falls below the proper height the reverse happens and the web is driven back up. This system creates a seeking process that is always driving the web to the correct height. The system can also be used on a pivoting feed roller system. The sensor feedback turns an eccentric that changes the pressure gradient, moving the web to the proper height.
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