| 摘要 |
<p>The present subject matter relates to a feed roller system for high speed image scanning equipment, which improves the feeding of documents, and in particular, thin or ultra-thin documents, into the scanner equipment. The feed roller system comprises a pick roller and a feed roller, each associated with its own clutch, allowing the pick roller and feed roller to be selectively driven together, independently, and/or not at all. Initially, both rollers are driven to feed a document. Drive to the pick roller is disabled by the pick roller clutch when the leading edge of the document reaches a gap control sensor, downstream of the rollers. Drive to the feed roller continues until it is disabled by the feed roller clutch when the leading edge of the document reaches a page entry sensor, downstream of the gap control sensor and the first transport rollers. The first transport rollers continue to feed the document, while the pick roller and the feed roller are disengaged, thus preventing overfeeding or misfeeding by the pick roller and/or feed roller.</p> |
