JPS63123740A - Automatic original feed device - Google Patents

Abstract

PURPOSE:To perform the excellent feed of various originals and to save energy, by a method wherein a stopper is mounted so that the set position of an original is set to a specified spot, and a roller capable of following the stopper is situated to the stopper. CONSTITUTION:With a copy button turned ON, a call roller 7 is lowered, and an original 4 is pressurized by means of a call roller 6. Along with the above motion, a stopper 8 is moved upward aside. The call roller 6, a drive side 11a of a pull-out roller, and a separation roller 18 are rotated, and separated original 4 is conveyed to a contact glass 13 by means of pull-out roller 11a and 11b. When the tip of the original 4 is detected by a separation sensor 17, the drive of a separation roller 18 is stopped, and the call roller 7 and the stopper 8 are returned. A problem in that a thrust feed original and the original 4 pulled out during processing of a jam is damaged by the stopper 8 can be prevented from occurring through retraction of a suspension part 8a of the stopper 8 from a follower roller 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a document feeding device that sequentially feeds documents one by one.

(Prior Art) Conventionally, in an automatic document feeder that sequentially feeds documents starting from the lowest document, the separation pressure has been increased to prevent double feeding of documents.

This results in an increase in the size of the device and an increase in driving load, and there are also problems in that pencil-written originals become heavily stained and thin originals cannot be passed through.

(Objective) It is an object of the present invention to provide an automatic document feeder that solves the above-mentioned problems of the prior art, can efficiently feed various documents, and achieves low cost and energy savings.

(Structure) In order to achieve the above object, the present invention provides an automatic document feeder that feeds documents sequentially starting from the lowest document, and provides a stopper so that the document is set at a fixed position, and the stopper is driven by the stopper. A rotatable roller is provided, a moving means is provided to avoid the stopper upwards when the paper feed operation starts, and a detection means is provided to detect the completion of separation of the passed document,
The present invention is characterized in that the stopper is moved from the avoidance position to the position where the roller and the document abut on the basis of the detection signal of the detection means.

Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

Fig. 1 is a front sectional view, Fig. 2 is a front sectional view showing the separation roller and separation belt, Fig. 3 (al is a plan view showing the stopper moving means, Fig. 3 is a front view showing the moving means) , FIG. 4 is a front view for explaining the operating state of the main parts, and FIG. 5 is a front view showing the positional relationship between the stopper and the document.

In FIG. 1, a document feeder 2 is arranged on a copying machine main body 1, and an end of a document table 5 on which a document 4 is placed enters into a cover 3 of the document feeder 2. At the end of the document table 5, a calling roller 6 and a calling roller 7 are arranged so as to be able to come into contact with and separate from each other, and a stopper 8 that forms a hanging portion 8a at the tip and comes into contact with the end of the document 4 is arranged. . This stopper 8
A driven roller 9 is provided on the inside of the shaft so as to protrude from the hanging portion 8a, and its end portion is supported by a stopper shaft 10. The driven roller 9 can come into contact with the surface of the document 4. A driving side 11a and a driven side 11b of the pull-out roller are rotatably disposed below the stopper 8, and a guide plate 12 for guiding the transfer of the original 4 is connected to the pull-out rollers 11a, 11b from the original table 5. The contact glass 13 is reached through the contact glass 13. A conveyor belt 14 and a plurality of belt drive rollers 15 are disposed above the contact glass 13 .

Further, in FIG. 1, reference numeral 16 indicates a document sensor for detecting the presence or absence of a document, and 17 indicates a separation sensor, which is a detection means for detecting the leading edge of the document and detecting the completion of separation.

A separation roller 1 is provided on the drive side 11a of the pull-out roller.
8 are provided coaxially, and as shown in FIG. 2, a separation belt 19 is in contact with the upper part of the separation roller 18.

One end of this separation belt 19 is fixed to a leg portion 20a of a holder 20 fitted to the cover 3, and the other end is locked to a receiving portion 20b of the holder 20 via a tension spring 21.

Further, the stopper 8 can be rotated around a stopper shaft 10 by a moving means shown in FIGS. 3(a) and 3(b). The moving means includes a solenoid 22, a link body 23 reciprocatably connected to a drive arm 22a of the solenoid 22, and a pair of links inserted into a long hole 23a formed in the link body 23 to guide the link body 23. pin 24
, a spring 25 for returning the link body 23, and a link 26 having a shaft 26a inserted into an oblique hole 23b formed at the left end of the link body 23.
6 is fixed to the stopper shaft 10.

Next, the operation of the above embodiment will be explained.

The original 4 is placed with the image side facing upward until it contacts the hanging portion 8a of the stopper 8, and is placed on the original table 5. t will be done. The document sensor 16 detects that the document 4 has been set.

The calling roller 7 is located at the position indicated by the solid line in FIG.

Then, when a copy button (not shown) is turned on, the calling roller 7 is lowered to the position indicated by the dashed line and presses the original 4 against the calling roller 6. In conjunction with this downward movement of the calling roller 7, the stopper 8 moves upward to avoid the position indicated by the dashed line. That is, the solenoid 22 is activated by turning on the copy button, and the link body 23 is connected to the pin 24 and the elongated hole 2.
3a and is pulled against the spring 25 in the direction of the arrow. Then, since the diagonal hole 23b of the link body 23 also moves in the direction of the arrow, the shaft 26a rises.
The rise of a causes the stopper shaft 10 to rotate counterclockwise via the link 26. Therefore, the stopper 8 fixed to the stopper shaft 10 moves upward.

After completing this series of operations, the calling roller 6, the drive side tia of the pull-out roller, and the separation roller 18 rotate counterclockwise, and the document 4 is transferred from the lowest page to the separation roller 18.
The separated original 4 separated by the separation belt 19 is conveyed to the contact glass 13 by pull-out rollers 11a and 11b. The original 4 conveyed to the contact glass 13 is conveyed to a predetermined position on the contact glass 13 by the conveyance belt 14 and the belt drive roller 15, and then stopped. Then, the document 4 is detected by the separation sensor 17.
When the tip of the separation roller 18 is detected, the drive of the separation roller 18 is stopped,
The calling roller 7 and the stopper 8 return to the positions indicated by solid lines in FIG.

To return the stopper 8, the solenoid 22 is turned off by detection by the separation sensor 17, and when the solenoid 22 is turned off, the link body 23 is moved in the opposite direction of the arrow by the weight of the stopper 8 and the tensile force of the spring 25. It is done by The driven roller 9 of the stopper 8 comes into contact with the surface of the original 4 as shown in FIG.

The problem with this dropping operation of the stopper 8 is that the document 4 that is pulled out during jam handling with the last fed document is damaged by the stopper 8, but this is because the hanging portion 8a of the stopper 8 is As shown in Fig. 5, the driven roller 9
Since the document 4 is retracted further, the document 4 is prevented from coming into direct contact with the hanging portion 8a.

By providing the stopper 8 as described above, the separation pressure can be reduced, so that it is possible to pass thin originals, and the smearing of pencil-written originals is reduced.

Furthermore, due to the reduction in separation pressure, the driving capacity of the solenoid can be reduced, making it possible to achieve a relatively low cost and compact design.

(Effects) As explained above, by providing a stopper with rollers, the present invention can reduce the separation pressure of originals compared to the conventional art, thereby making it possible to smoothly feed various originals, and reducing costs. An automatic document feeder that can save energy can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front sectional view;
Fig. 2 is a front sectional view of the separation roller and separation belt portion, Fig. 3(a) is a plan view showing the stopper moving means, and Fig. 3(a) is a plan view showing the means for moving the stopper.
FIG. 4 is a front view showing the operating state of the main parts, and FIG. 5 is a front view showing the positional relationship between the stopper and the document. 4... Original, 8... Stopper, 9... Roll, 1
0゜22.23.24.25.26...Transportation means, 1
7...Detection means. 1 figure % 2 causes

Claims (1)

[Claims] In an automatic document feeder that sequentially feeds documents starting from the lowest document, a stopper is provided so that the document is set at a fixed position, and a roller is provided that can rotate following the stopper. A moving means for upward avoidance and a detection means for detecting completion of separation of the passed original are provided, and the stopper is moved from the avoidance position to a position where the roller and the original come into contact based on a detection signal from the detection means. An automatic document feeder characterized by: