Automatic document feeding device

Abstract

The invention relates to an automatic document feeding device, which comprises a paper supplying disk, a pick-up roller for picking up a document, at least one feeding roller for feeding the document, a scanning unit for scanning a document image, a discharging roller for discharging the document and a paper outputting disk. The automatic document feeding device also comprises a feeding path, a single-face scanning and discharging path, a double-face scanning path, a double-face scanning and discharging path and an electromagnetic valve, wherein the document passes through the feeding path and enters a scanning area from the paper supplying disk; the document passes through the single-face scanning and discharging path and enters the discharging roller from the scanning area; the document passes through the double-face scanning path and enters the scanning area from the discharging roller; the document entering the scanning area passes through the double-face scanning and discharging path and enters the discharging roller from the scanning area; and the electromagnetic valve selectively opens or closes the path between the discharging roller and the paper outputting disk. When the path between the discharging roller and the paper outputting disk is opened, the document enters the paper outputting disk from the discharging roller.

Description

technical field [0001] The invention relates to an automatic document feeding device, in particular to an automatic document feeding device providing single-sided and double-sided scanning paths. Background technique [0002] In scanners, an automatic document feeding device is usually used to provide automatic feeding of documents, thereby improving work efficiency and quality. Generally, the automatic document feeding device can realize the document automatic feeding function of single-sided scanning and double-sided scanning. In addition, the current pursuit trend is small size, simple structure, easy control, low cost, and high speed, so most of the conventional technologies are developed towards this goal. [0003] U.S. Patent No. 5,438,435, published on August 1, 1995, discloses a double-sided scanning document feeder with a C+S type path, which has a high document feeding speed, but at least one The feed roller needs to be reversed, which not only increases the comp...

AI Technical Summary

Problems solved by technology

Its fourth embodiment schematically describes an automatic document feeding device that does not seem to require reverse feed rollers, but the automatic document feeding device uses more feed rollers and controls single-sided and double-sided scanning Switching requires two pressure-applying parts to work together, and the structure is complex; and the automatic document feeding device scans the back of the document first and then scans the front of the document during double-sided scanning. In order to sort, the system must first save the back image and then save the front image , and then reverse the order of the back and back images to output, which will lead to an increase in storage space and complexity in the processing procedure; in addition, the document feeding path is longer, that is, the path for the document to enter the scanning area after being picked up is shorter. long, which increases the chance of skewing the paper

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