JPH0537950Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention automatically feeds originals one by one from a stack of originals stacked on the original table to a predetermined position on the contact glass of the copying machine body, and makes copies. The present invention relates to an automatic document feeder that automatically discharges a completed document to a document tray.

Prior Art When making copies from a series of original sheets made up of multiple sheet originals, in order to save the trouble of placing the originals on the contact glass and improve the copying speed, it is necessary to copy the originals from the stack of originals stacked on the original platen. An automatic document feeder (automatic document feedet) that automatically feeds originals one by one to a predetermined position on the contact glass of the copying machine body, and after copying is completed, automatically ejects and stacks the originals on the document tray. (hereinafter referred to as ADF) is used.

Figure 4 is a diagram showing a schematic configuration of an example of an ADF.
This ADF covers the entire surface of a contact glass 2 provided on the top plate of the copying machine body 1, conveys the original to a predetermined position on the contact glass 2, and has a belt conveyor belt 22 that conveys the original after copying is completed. section A, a document table 3 provided above the document table 3, and a stack of documents 4 placed on the left side of the belt transport section A and stacked with the image side facing up on the document table 3.
Separation paper feeding unit B takes out originals one by one from the lowest one, separates them one by one, and sends them to the belt transport unit, and after exposure is completed, the originals are placed on the upper surface of the part above the belt transport unit of the ADF cover 6. It is composed of a document reversing/discharging section C which discharges the document into a formed document discharge tray, converts the front and back sides of the document during double-sided copying, and feeds the document onto a contact glass.

To explain the structure of the separation paper feeding section B in more detail with reference to FIG. 5, a calling roller 5 is provided below the document table 3 inserted into the interior thereof so that a part of the top thereof is exposed above the table 3. A call roller 7 is provided at its upper end so that it can be moved toward and away from the roller 7 by a solenoid (not shown) or the like. Normally, the pick-up roller is located at a position shown by the solid line, away from the pick-up roller 5, and does not interfere with the insertion of the original. When the print key is pressed on the copying machine, the call roller 7 is set to 1.
It descends to the position 7' indicated by the dotted chain line, and presses the original against the calling roller 5. The pick-up roller 5 rotates counterclockwise and sends out the document in contact with it in the direction of an arrow 101. In order to feed the delivered original onto the contact glass 2 with its image side facing down, a reversing section is provided downstream of the calling roller 5 to invert the original into a U-shape. As shown in detail in FIGS. 5 and 6, a separation roller 25 is provided at the center in the width direction of the reversing section, and pull-out rollers 10 are provided on both sides of the separation roller 25 so that the drive shaft thereof is coaxial with the separation roller. It is provided. A guide rib 11 is provided to cover approximately the upper half of the document reversing section that is in contact with the separation roller 25 and the pull-out roller 10, and forms a reversing path. A separation belt 29 stretched over a separation belt holder 30 fixed to the machine frame of the ADF is in contact with the separation roller 25, and the document is separated into one sheet by the cooperation of the separation roller 25 and the separation belt 29. separated into parts. Each pullout roller 10
A driven roller 12 provided on the outside of the U-shaped conveyance path is in pressure contact with the document, and the document separated by the separation roller 25 and separation belt 29 is moved between the contact glass 2 and the conveyance belt 22 in the direction of arrow 102. send out.

Now, in the conventional ADF of this type, the guide ribs constituting the conveyance path of the reversing section are usually fixed to the machine frame of the ADF, as shown by hatching around the periphery in FIG.

However, when the guide rib is fixed, the shaft of the pull-out roller is subjected to a load due to the separation belt, etc. during document transport, and the shaft bends as shown by the chain line in Figure 6, so that the outer peripheral surface of the pull-out roller and the guide surface of the guide rib are It is difficult to set the gap between the originals to a desired value, and there is a problem in that the leading edge of the original document is easily folded or skewed.

Purpose The purpose of the present invention is to provide an ADF that solves the above-mentioned problems of the separate paper feed section of the conventional ADF with the above configuration, and that prevents the leading edge of the document from folding and skewing during paper feeding. do.

Configuration In order to achieve the above object, the present invention divides the guide member into two parts in the width direction at the separation roller part in the paper separation and feeding section of the ADF having the above-mentioned structure, and the guide member is divided into two parts in the width direction by the separation roller part. It is characterized in that it is mounted so that its position can be adjusted in the front and back directions in the document conveyance direction.

The present invention will be explained in detail below based on the drawings showing the embodiments thereof.

FIGS. 1 and 1 are diagrams showing an embodiment in which the present invention is applied to a reversing section of a paper separation and feeding section of an ADF having the configuration explained in FIG. 5.

As shown in these figures, the guide ribs 11 have two guide ribs, one on each side, sandwiching a separation roller 25 provided at the center in the width direction of the reversing section of the paper separation and feeding section and a separation belt 29 in contact with the roller 25. ADF machine 6
It is attached by a set screw 36 to a screw hole of an attachment boss 35 provided in the.

FIG. 3 is a diagram showing the shape of each guide rib 11, in which a plurality of ribs 11a are integrally formed on a connecting portion 11b, and the arched surface of the rib 11a forms a document guide surface. A hole 11 through which a set screw 36 for attaching the guide rib 11 to the ADF machine frame 6 is passed.
A total of four holes c are bored in the document transport width direction, two at the front and rear of both ends, and these holes are elongated holes that are long in the transport direction. Therefore, the mounting positions of the guide ribs 11 can be arbitrarily set in the front and rear directions separately for left and right within the length of the parallel portion of the elongated hole.

As a result, as shown in FIGS. 1 and 2, if the center of the separation roller 25 is located slightly behind the center of the pull-out roller 10 and the axis passing through the center of these rollers is bent in an arc, the left and right guide ribs Reference numeral 11 denotes a document guide surface formed by the arcuate edge of the rib 11a, a separation roller 25, and a pullout roller 10.
The center line of the guide rib 11 can be tilted from a direction perpendicular to the conveying direction so that the gap between the guide rib 11 and the guide rib 11 is optimized.

In this embodiment, the guide ribs 11 are installed so that the gap is narrow at the center of the conveyance width where the separation roller 25 is provided and widened at the outside in order to prevent edge folding and skewing of the leading edge of the document. It is being

Note that if the load on the pull-out roller shaft or the diameter of the pull-out roller changes, the amount of deflection of the shaft changes, but according to the present invention, it is possible to easily adjust and install the pull-out roller in the optimum position. Furthermore, by making the ADF cover and guide rib separate, the degree of freedom in design increases and the ideal guide shape can be easily set.

Effects As described above, according to the present invention, it is possible to prevent folding and skewing of the leading edge of a document in the reversing section of the automatic document feeder, and it is possible to prevent the edge of the document from being bent or skewed by changing the dimensions of the component parts, the load, etc. It can be easily handled in any case.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the structure of the paper feed guide section of the embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a perspective view showing the shape of the guide rib, and Fig. 4 is automatic document feeding. A side sectional view showing a schematic configuration of an example of the device,
FIG. 5 is a cross-sectional view showing the configuration of the reversing sheet feeding section, and FIG. 6 is a cross-sectional view taken along the - line in FIG. 1...Copier main body, 2...Contact glass,
4...Original, 10...Pull-out roller, 11...
...Guide rib, 12...Pull-out roller driven roller, 25...Separation roller.

Claims (1)

[Scope of claim for utility model registration] (1) Take out the originals sequentially from the bottom of the stack of originals stacked on the original table with the image side facing up, and
An automatic document feeder that reverses the document in a letter shape and feeds it onto the contact glass of the main body of the copying machine, and a separation roller for separating the document one by one is provided at the center in the width direction of the reversing section. , a pull-out roller for pulling the document separated by the separation roller is provided on both sides of the separation roller so that its drive shaft is coaxial with the axis of the separation roller, and a driven roller in contact with the pull-out roller is provided outside the document conveyance path of the reversing section. In an automatic document feeder equipped with a guide member that guides the outer surface of a document being conveyed through a reversing section, the guide member is divided into two parts in the width direction at the separation roller part, and each of the guide members is divided into two parts on both sides in the width direction. An automatic document feeder, characterized in that the automatic document feeder is attached to a machine frame of the automatic document feeder so that its position can be adjusted in the front and back directions in the document conveyance direction. (2) A practical use characterized in that the position of the guide member is adjusted so that the gap between the separation roller and pull-out roller and the guide surface of the guide member is narrow in the center and widens on both sides. An automatic document feeding device according to claim 1 of the patent registration claim.