JPS6186329A - Automatic original copy feed device - Google Patents

Abstract

PURPOSE:To make it possible to prevent an image on an original copy from being stained due to rub with a separating roller, by allowing a paper feed roller formed on its outer peripheral surface with a flange-like projected peripheral section, to overlap with the separating roller such that the rubbing force of the feed roller with the separating roller is reduced. CONSTITUTION:When a double feed of original copies happens, the upper one O1 of the original copies alone is slipped and separated by a paper feed roller 5 on rotation and a separating roller 6 which is unrotatable and when the leading end of the copy is detected by a sensor 7, the solenoid 29 turns an actuating rod 28 clockwise to rotating displace an adjusting cam 26 from the position A to the position B. Further, when the cam 26 is set at the position B the overlapping amount of both rollers 5, 6 are set to a value of M2. After the original copy O1 alone is slipped and separated, when the overlapping amount comes to have the value of M2, the original copy O1 is transferred between both rollers 5, 6 due to the friction force of the roller 5. When the original copy passes the sensor 7, the solenoid 29 is deenergized. After slipping and separating of the original copy, the original copy is transferred with a small overlapping amount, thereby it is possible to avoid staining the original copy with pencil powder.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an apparatus for automatically feeding a document in a copying machine or the like.

(Prior art) Copying (In some cases, the original is set on the original table with the image side facing down, and the original is directed from above to the contact glass of the copying machine using the rotational frictional force of the paper feed roller using a yoke. A self-feeding device for original documents is known. Such an automatic document feeder is designed to feed only one sheet of the document by feeding the document at the leading edge of the 7-space original table. A pair of upper and lower rollers are arranged nearby, with the upper roller acting as a feed roller to which a rotational driving force is applied, and the lower roller being a roller that cannot rotate in the direction of movement of the document being fed from the document table. When a plurality of original documents are fed at the same time between the two rollers, the documents are shifted and separated between the two rollers.

(In an automatic document feeder that performs copying by such a shift), when using a document on which a single stroke is drawn with a pencil, for example, the surface of the character image is shifted and separated by the lower separation roller. Since the paper always rubs against the paper, the character image becomes smeared with pencil dust. Furthermore, when using a manuscript in which the stroke order has been written using a ballpoint pen, or a typed-out manuscript 2, the image will be smeared in the same way.

(Objective) An object of the present invention is to provide an automatic document feeding device that prevents image stains on a document due to sliding friction with a separation roller.

(Structure) In order to achieve the above-mentioned object, the present invention interchanges a feed roller with a flange-like protrusion formed on its circumferential surface and a separating row 2, which also has a flange-like protrusion formed on its circumferential surface. It is characterized in that it has a configuration in which it ramps upward/<- and that the amount of overlap is adjusted by a cam so that the sliding force with the separation roller can be reduced.

The present invention will be explained below based on one embodiment.

FIG. 1 shows an automatic document feeder, which is composed of an automatic document feeder 1 according to the present invention, and an automatic document feeder 2 connected to this device.

The automatic document feeder 1 includes a document table 3 on which the document is placed and set with the document facing downward in the image plane, a document feed roller 4,
It consists of a feed roller 5, a separation roller 6 disposed in pairs below the feed roller, a document detection sensor 7, a pair of conveyance rollers 8, guide plates 9 and 10, and the like.

In FIG. 2, the feed roller 5 is given a rotation inhibiting action in the direction indicated by the arrow, and when the feed roller 5 rotates in that direction, the document feed roller 4 is moved through the belt 12 by the arrow. Rotate in the direction.

The document feed roller 4 and the bell) 12 are swingable around the center of the feed roller 5 5a'l, and the roller 4
When the roller 4 is in the oscillating position at the virtual line position, the roller 4 is separated from the document, and when it is at the oscillating position at the solid line position, the roller 4 is in contact with the original f height. There is.

Here, the document table 3 has document 0. ．． 02,03 etc.χ
, place the original O1 with the image side facing down and press the button (not shown), the paper feed roller 4 descends to the solid line position and comes into contact with the surface of the original O1 opposite to the image surface.
The four rollers 4 rotate in the direction of the arrow, and the original 01 is sent between the feed roller 5 and the separation roller 6 by the rotational frictional force at this time. Note that both rollers 5 and 6 are provided near the leading end side of the document table 3 in the document feeding direction.

The original sent towards both rollers 5 and 6 passes between both rollers, passes through a pair of transport rollers 8, and is automatically transported between the original transport belt 13 of the device 2 and the contact glass 14 of the copying machine main body 15. Be sent in between.

In FIG. 1, the document is temporarily stopped between the belt 13 and the contact glass 14, the document is illuminated and scanned, and then ejected in the direction of arrow a and placed on the document tray 16.
It is housed in mulberry.

Here, when a plurality of originals are set on the original table 3 and the print button is pressed, the upper original 01 is first fed by the original paper feed roller 4, and after this feeding, the second original 02 is fed successively, and after this, 3 more
The first document 03 is being fed, but like this,
The modes in which a plurality of documents are sequentially and continuously fed are referred to as A and DF (auto document feed) modes.

On the other hand, by setting only one original and pressing the print button, only one original is fed, and by repeating these steps, the original is fed one by one. , 5Af) F (semi-auto document feed) mode.

Incidentally, such a mode selection can be made by pressing either the A1 mode setting button 17 or the ADF mode setting button 18 shown in FIG.

In FIG. 1, the feed roller 5 is located at both ends and in the center;
ηBi, the brim-shaped protruding portion 5b? : The protruding peripheral part 5b and the brim-like protruding part 6b similarly provided on the circumferential surface of the separating roller 6 enter each other like a slender. The projecting periphery is in an overlapping state.

As described above, in the automatic document feeder according to the present invention, the feed roller 5 and the separation roller 6 are prevented from being directly rubbed, and the document is prevented from being rubbed against the rollers. Try not to let it happen.

In FIGS. 3 and 7, both ends of a shaft 6a to which a separation roller 6 is periodically attached are supported by an Affi plate 21 via a one-way clutch 20. As shown in FIG.

In FIG. 3, the one-way clutch 20 is interposed between the shaft 6a and the adjustment plate 21 to allow the separation roller 6 to rotate clockwise and disable its rotation counterclockwise. There is.

That is, the separation roller 6 has a one-time transmission capability in the direction of movement of the originals fed from the original table 3, and when the originals are fed double, the feed roller 5 rotates in the leading direction. The document is shifted and separated between the two.

The image adjustment plate 21 is a stationary side plate 22 of the automatic document feeder.
．． 23 by a riveted shaft 24. The adjustment plate 21 is provided with a notch 21a, and this notch 21. An overlap amount adjusting cam 26 is fitted into the cam 26. The adjustment cam 26 is fixed on the stay shaft 27, and the stay shaft 2
Both ends of 7 are rotatably supported by immovable 1QII plates 22 and 23.

The base end of an operating rod 28 is fixed to the stay shaft 27,
A plunger 29a of a solenoid 29 is connected to the free end of the operating rod 28. A compressible spring 32 is interposed between the operating rod 28 and the immovable pin 31, and the rotation of the operating rod 28 by this spring 32 is prevented by a stopper member 33.
is prevented by.

-1 In FIGS. 3 and 4, the adjustment cam 26
As the adjustment plate 21 rotates, the adjustment plate 21 is swung in a direction so that the 4-separation roller 6 moves away from or very close to the feed roller 5 with the front rivet 24 as the center. 17'f, and when the adjusting cam 26 is in the first position indicated by the symbol A, the amount of mutual overlap between the rollers 5 and 6 is M.
l is set.

Here, the overlap amount M1 refers to the amount of overlap M1 caused by the original feed roller 4 (see FIG. 2). When two or more sheets are double-fed, this is the amount of overlap that is sufficient to shift and separate the double-fed originals and stripes. For example, 0.6
The amount is about 0.8 m/m to 0.8 m/m.

Now, assume that you are copying multiple originals such as pencil originals that tend to have no image on the leading edge side as the original f height, and in this case, press the ADF mode setting button 17 shown in
Press C.

Then, the automatic document feeder automatically feeds multiple documents one after another.
This is a continuous feeding mode. In this mode,
When a plurality of originals are placed on the original table 3 and a print button is pressed, the originals and stripes are sequentially fed one by one from the top by the original feeding roller 4.

Here, when the documents are fed double, only the upper document 01 is shifted and separated by the rotating feed roller 5 and the non-rotatable separation roller 6, as shown in FIG. be done. When this leading edge reaches the document detection sensor 7 and is detected by this sensor, the solenoid 29 shown in FIG. 3 is excited by this detection signal.

Along with this, the solenoid 29 is a plunger 29a.
, and rotate the operating rod 28 clockwise against the elasticity of the spring 320 to the position shown in FIG.

When the operating rod 28 turns to the position shown in FIG.
6 is rotationally displaced from the first device A to a second position indicated by the symbol B. When the adjusting cam 26 is at the second position, the amount of overlap between the rollers 5 and 6 is set to M2.

Here, the amount of overlap, V2, is the amount of overlap that is sufficient to transport the document without causing displacement (7) separation. This overlap amount M2 is smaller than the above-mentioned overlap amount NI, and is set to, for example, about 0.1 to 0.2 m/m.

After only the original height O1 is shifted and separated, the overlap amount is M2, and the original 01 is moved between both rollers 5.
, 6 (see FIG. 6) by the rotational frictional force of the feed roller 5, and when the document passes the sensor 7, the excitation of the solenoid 29 is released.

In this way, after the shift separation is performed, the document is transported with a small amount of overlap, so the mutual rubbing force between the image surface of the document and the separation roller 6 is reduced, and pencil dust is removed.・It is possible to avoid the occurrence of surface image stains.

When the solenoid 29 is de-energized, the operating rod 28 shown in FIG. 5 is rotated counterclockwise to the position shown in FIG.
Rotation returns from position to A position.

During this time, the adjustment plate 21 rotates counterclockwise around the riveted shaft 24 (τ), and at the position shown in FIG. 3, the amount of overlap is set to MI.

In this state, the next document is shifted and separated, and then the solenoid 29 is energized again, and the above-described operation is thereafter repeated.

The above is a process that can be used when there is no image on the leading edge of the document, but on the other hand, if there is a pencil image or the like on the leading edge of the document, the image stains due to friction with the separation roller can be moved to the leading edge. When the L1 of the original is generated, the 5ADF mode setting button 18 shown in FIG. 2 is pressed. By pressing this button, the document self-help pick-up device enters the 5ADF mode in which the document is fed one by one when the original is set one by one.

Here, if you press the 5ADF mode setting button 18, the third
The solenoid 29 shown in the figure is energized. In other words, when setting this 5ADF mode, ζ is the ADF
Unlike when setting the mode, the solenoid 29 is energized from the beginning.

When the solenoid 29 is energized, the adjustment cam 6 is actuated by the cam drive means consisting of the solenoid, the operating rod 28, etc.
is displaced from the first device A to the second position BK in FIG. 5, and the overlap amount is set from the beginning to an overlap amount M2 that is sufficient to carry and cover the original.

In this setting state, if only one original is set on the original table 3 and the print button is pressed, the 14 originals are conveyed between the rollers 5 and 6 with a reduced amount of overlap. That is, in this case, only one original is set and only one original 7. Since the mode is such that the document is fed at the same time, there is no need to shift and separate the documents at the same time. 1. The airflow area in which the rubbing force of the document against the separation roller 6 is reduced extends from the leading edge to the trailing edge, thereby making it possible to prevent image stains caused by pencil powder over the entire surface of the document.

Of course, in this case, even when using a ballpoint pen manuscript or a typed-out manuscript, it is possible to prevent image staining due to similar rubbing. On the other hand, if a document written with a ballpoint pen is copied before the ink has completely dried, image stains 2 will occur, but the present invention can also deal with such cases.

In the above embodiment, a rotating cam is used as the overlap amount adjustment cam, but the invention is not limited to this, and a linearly inclined cam may be used, and the cam surface shown in FIG. Directly and engaged with the upper circumferential surface of the shaft 6a shown,
In this state, it is also possible to displace the cam in the linear direction and move the separation roller 6 in the vertical direction for overlapping adjustment.

(Effects) As described above, according to the present invention, since the sliding force of the original against the separation roller for separating the originals in cooperation with the feed roller is reduced, the sliding force of the original is reduced. It should be possible to effectively prevent image stains caused by rubbing.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an automatic document feeding and conveying device equipped with a device according to an embodiment of the present invention, Fig. 2 is a groove bottom view of the analyzed surface of the device according to an embodiment of the present invention, and Fig. 3 is an adjustment of the amount of overlap of the device according to the above embodiment. Fig. 4 is a cross-sectional view showing the positional relationship between the separation roller and the feed roller when the overlap amount is set to 100%, and Fig. 5 shows the state in which the overlap amount is set to small. FIG. 6 is a sectional view showing the positional relationship between the separation roller and the feed roller when the overlap amount is set to a small amount, and FIG. 7 is a perspective view of the overlapper adjustment mechanism. be. ■... Original self-help feeding device, 3... Document table, 4... Document feed roller, 5... Feed roller, 5b... Surrounding portion, 6...
Separation roller, 6b... Projection, 26.
...Overlap amount adjusting cam, 28... Operating rod, 29... Solenoid ■7)

Claims (1)

[Scope of Claims] A document table on which a document is placed and set with its image side facing downward; and a document feeder that rotates in the document feeding direction in contact with a surface opposite to the image surface of the document on the document table. a feed roller that is provided near the tip of the document table in the document feeding direction and has a flange-like protrusion on its circumferential surface and is provided with a rotational driving action; The rollers are arranged in pairs on the lower side and form a flange-shaped periphery that overlaps the periphery of the same feed roller. a separation roller held in a non-rotating state in the moving direction of the document fed from the document table in order to shift and separate the documents; a first position for setting an overlap amount necessary for the shift and separation; a plurality of overlap amount adjusting cams that are displaceably disposed at respective positions with respect to a second position that sets an overlap amount that is smaller than the overlap amount that is sufficient to transport the document without causing shift separation; When setting the ADF mode in which originals are sequentially and continuously fed by the paper feed roller, the adjustment cam is placed in the first position until the shift separation is performed, and the originals are fed one by one by the paper feed roller. A document characterized by comprising a cam driving means for displacing an adjustment cam to a second position when setting an SADF mode in which the document is set and fed one by one, and after the shift separation is performed. Automatic feeding device.