JPH02225242A - Automatic feeding device for original - Google Patents

Abstract

PURPOSE:To permit the stable input processing by installing a pair of transport belts on both side positions of an original and installing a photoelectric sensor which detects the gap between the edge of the original and both sides of the input standard position of the original and detects the skew of the original. CONSTITUTION:Conveyor belts 4 and 5 for transporting an original 2 to an original read-out position are installed onto both side positions of the original, and the photoelectric sensors 8 and 9 for detecting the skew of the original 2 by detecting the gap between the edge of the original 2 and both sides of the input standard position 7 of the original are installed. When the skew of the original 2 is detected, the transport belt 4 and 5 at the position on the side where the gap is detected is revolution-driven in the reverse direction, and skew is corrected by continuing the operation until the gap is eliminated. Therefore, the original to be read out is correctly transport to the input standard position 7, and the stable input processing is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an automatic document feeder, and more particularly to an automatic document feeder for information processing input scanners and copying machines using cut sheets.

[Prior Art] Automatic document feeders are generally used for the purpose of automatically conveying several scanned documents one by one to the reference position of an input scanner or a copying machine. Due to frictional resistance with the glass surface of an input scanner or a copying machine at a reading position, an automatic document feeder has become necessary to accurately convey a read document to an input reference position.

An example of the operation of a conventional automatic document feeder will be described with reference to the drawings.

FIG. 3 shows a plan view of an automatic document feeder in an information processing input scanner, in which several cut paper documents 2 for reading are set on a document table l.

The sheets are fed out one by one by the paper feed section 3 and conveyed by the conveyor belt 14 to the glass surface 6 of the input scanner. Further, the conveyor belt 14 rotates in the reverse direction, abuts the read document 2 against the input reference position 7, and sends it out to the paper discharge section 10 after input processing.

[Problems to be Solved by the Invention] In the conventional automatic document feeder described above, when the frictional resistance between the cut paper document 2 for reading and the glass surface 6 of the input scanner is large, the input scanner It becomes impossible to accurately convey the original document 2 for reading to the reference position, and there is a drawback that skewing occurs with respect to the input reference position.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and provide an automatic document feeder that can accurately convey a read document to an input reference position at all times and perform stable input processing.

[Means for Solving the Problems 1] The present invention has been made to solve the above-mentioned problems, and as a means of solving the problems, the present invention provides a means for moving a cut paper document placed on a document table to a predetermined document using a conveyor belt. In an automatic document feeder that transports a document to a reading position and discharges the document to a paper discharge section after reading, the above-mentioned conveyor belt for conveying the document to the document reading position is provided with a length of 2 jft on both sides of the document, and the conveyor belt is provided on both sides of the document input reference position. A photoelectric sensor is provided which detects the gap between the document edge and the edge of the document, detects the skew of the document, and drives the conveyance belt at the gap detection side position to correct the skew of the document.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1A and 1B are cross-sectional views of an automatic document feed bag according to an embodiment of the present invention, showing the detection state of gaps at both ends of the document, and FIG. 2 is a plan view thereof.

In the figure, 1 is a document tray, 2 is a cut paper document, 3 is a paper feed section, and 4 and 5 are 2. I#I conveyor belt, 6 is the glass surface of the manual scanner, and 7 is the input reference position.

8 and 9 are photoelectric sensors, and 10 is a paper discharge section.

The original table l is designed to allow several cut paper originals 2 to be placed thereon.

The paper feed section 3 is configured to send out the originals 2 on the original table 1.1 one by one to the conveyor belts 4 and 5 side.

The conveyor belts 4.5 are provided at both sides 8 of the document 2.

The conveyor belt 4.5 is wide enough to accommodate various document sizes. Then, the document 2 is conveyed to the document reading position t by the conveyor belts 4 and 5, and positioned at the manual reference position 7.

The photoelectric sensors 8 and 9 detect the gap between both sides of the input reference position 7 of the document 2 and the edge of the document, detect the skew of the document M2, and drive the conveyor belt 4 or 5 at the position on the gap detection side to cause the document to skew. It is designed to correct.

Next, the operation will be explained. First, several originals 2 set on the original table 1 are fed one by one from the paper feed section 3, and are sent to the glass surface 6 of the input scanner by both conveyor belts 4 and 5. It will be done. Furthermore, the conveyor belts 4 and 5 rotate in reverse,
The original 2 is brought into contact with the input reference position 7. In this state, the photoelectric sensors 8 and 9 operate to detect the presence or absence of a gap between the input reference position 7 and the leading edge of the document 2. If either the photoelectric sensor 8 or 9 recognizes that there is a gap cloth, the conveyor belt 4 or 5 starts to rotate in the opposite direction by itself toward the same side until the gap between the manual reference position 7 and the leading edge of the document 2 disappears. Continue the operation 11 times to correct the skew on the input 2Si quasi-plane.

When the correction is completed, input processing is started, and after completion of the input process, the read original is ejected to the paper ejection unit IO, and the feeding operation of the next read original is started.

[Effects of the Invention] As described above, the present invention provides an automatic document feeder that conveys a cut paper document placed on a document tray to a predetermined document reading position using a conveyor belt, and discharges it to a paper discharge section after reading. In this system, two sets of the above-mentioned conveyance belts for conveying the original to the original reading position are provided at positions on both sides of the original, and skewed feeding of the original is detected by detecting a gap between both sides of the input reference position of the original and the edge of the original. Since the structure is equipped with a photoelectric sensor that drives the conveyor belt at the gap detection side position to correct the skew of the document, the photoelectric sensor for detecting the skew of the read document at the input reference position controls one of the conveyor belts. You can correct skew by moving the
This has the effect of realizing stable conveyance of the scanned original.

[Brief explanation of the drawing]

1(a) and 1(b) are cross-sectional views showing the detection state of gaps at both ends of a document in an automatic document feeder according to an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. FIG. 2 is a plan view of a conventional automatic document feeder. IK document stand 3: Paper feed section 6: Glass surface 8.9: Photoelectric sensor

Claims (1)

[Claims] In an automatic document feeder, a cut paper document placed on a document tray is conveyed to a predetermined document reading position by a conveyor belt, and then ejected to a document output section after reading. Two sets of belts are installed on both sides of the document, and the gap between both sides of the input reference position of the document and the edge of the document is detected to detect the skew of the document, and the conveyor belt at the gap detection side position is driven to move the document. An automatic document feeder characterized by being provided with a photoelectric sensor for correcting skew.