JPS6251521A - Paper resisting method for paper feeding device - Google Patents

Abstract

PURPOSE:To reliably convey a document, by a method wherein a fed paper is bent, and a paper feeding means and separating means are separated from each other in a condition in that a delivery means is forced into contact with a paper on a tray. CONSTITUTION:When, with a solenoid 52 excited, a shaft 57 is rotated counterclockwise and a set stopper 59 is rotated upward, a gate for a document P is opened, and a separating roller 31 is forced into pressure contact with a paper feed roller 33 through excitation of a solenoid 32. A pickup roller 47 is brought into contact with the document P on a document tray 7, and the rotation of the roller causes the feed of the document on the tray 7. A document, by which the under surface of the document is preceded, is fed by the paper feeding roller 33 as it is removed by a separating roller 31. A sensor S2 detects the forward end of the paper, the forward end of the paper is forced into collision with a contact part between a resist roller 51 and a pressure contact roller 54, and the intermediate part thereof is locked by the separating roller 31 and the paper feeding roller 33. In the document, on which slack is left, the slack is held by a pickup roller 47 resulting from separation of the separating roller 31 from the paper feeding roller 33.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides an image processing apparatus such as a copying machine, an image reader, a laser printer, a liquid crystal printer, an ion printer, a printing press, etc., in which a separating means and a paper feeding means are opposed to each other. The present invention relates to a paper registration method for a paper feeder that separates and supplies papers such as originals and copy papers one by one.

[Technical background of the invention]

Conventionally, a paper feeding device that supplies a document onto the platen glass of an image processing device, for example, a copying machine, feeds out the document on the document tray with a pickup roller, and has a paper feed roller that rotates in the paper feeding direction and a paper feed roller that rotates in the paper feeding direction, which are opposite to each other. The document is fed to a separation roller that rotates in the opposite direction, and the document is sent out by the feed roller, while the next document that follows this document is prevented from advancing by the separation roller, and the documents are separated one by one and sent out. ing.

The leading edge of the sent document is locked by a registration roller, and is deflected between the registration roller and the paper feed roller to register the leading edge of the document.

After the registration is completed, the original is sent onto the platen glass by rotating the registration rollers, set at the reference position, and copied.After the copying is completed, the original is ejected.

[Problems with background technology]

However, in such a paper feeding device, when the document is sent out by the registration roller, the paper feeding roller and the separation roller are in pressure contact with each other, so a large load is generated when feeding the document, and the document may be damaged or damaged. The dirt on the rollers is smeared onto the document.

Therefore, when the document is sent out by the registration rollers, if the pressure contact between the paper feed roller and the separation roller is released, the document will no longer bend, and the leading edge of the document will separate from the registration rollers.

For this reason, it becomes impossible to feed out the document using the registration rollers.

[Purpose of the invention]

In this invention, even after the leading edge of the paper is registered, even if the pressure contact between the paper feeding means such as the paper feeding roller and the separating means such as the separating roller is released, the deflection of the paper is maintained, and the conveying means such as the registration roller An object of the present invention is to provide a paper registration method for a paper feeder that can reliably transport a document.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides a system in which, after the paper sent out by the paper feeding means reaches the conveying means and is bent, the feeding means such as a pickup roller is brought into contact with the paper on the tray. , the paper feeding means and the separating means are separated from each other.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, as shown in FIG. 1, an automatic document feeder 5 will be described which feeds documents P one by one onto a platen glass 3 of a copying machine 1 and discharges them after copying. A stopper 4 is provided at one end of the copying machine 1 to serve as a reference position for a copy document.

The automatic document feeder 5 includes a document tray 7, a feed separation section 9, a paper feed path 11, a transport path switching section 13, a transport path switching drive section 15, a belt transport section 17, and a paper ejection path (reversing path) 19.
, a paper ejection tray 21, etc., and can automatically feed and eject documents P, and other parts except the transport path switching section 13 are integrated into a cover C and are attached to the back of the copying machine 1 via a hinge. It is installed so that it can be opened and closed, and can also be operated manually.

The feeding separation section 9 is constructed as shown in FIG.

First, the guides 23 and 25 constitute a part of the paper feed path 11, and a separating means such as a separating roller 31 and a paper feeding means such as a paper feeding roller 33 are arranged facing each other. Note that the separating means and paper feeding means may be a belt or the like. Further, the separating means may be a non-rotating roller, a rubber pad, or the like.

The separation roller 31 is attached to the rotating shaft 35 via a one-way clutch, and rotated by the motor 27 in a direction opposite to the paper feeding direction (clockwise in the figure). is attached to the paper via a one-way clutch, and is rotationally driven in the paper feeding direction (clockwise in the figure) by a motor 27.

Note that the separation roller 31 is brought into pressure contact with the paper feed roller 33 and separated from the paper feed roller 33 by a solenoid 32.

An arm 43 having a connecting portion 39 and a locking portion 41 is rotatably attached to the shaft 37 of the paper feed roller 33 . A pickup roller 47 is attached to the connecting portion 39 via a rotating shaft 45, and rotates together with the paper feed roller 33 via timing pulleys 44, 46 and a timing belt 49.

As shown in FIG. 2, a set of levers and an optical sensor S1 are attached near the pickup roller 47 to detect when the original P is set on the original tray 7.

A lever 55 is provided above the arm 43 and is mounted on a shaft 53 driven by a latching (keep) solenoid 52.

This lever 55 supports the locking portion 41 and locks the rotation of the arm 43.

Also, a shaft 57 driven by a latching solenoid 52
A set stopper 59 is provided, which is attached to the set stopper 59 to prevent the document P from entering the paper feed path 11 when the document P is lowered.

The latching solenoid 52 has, for example, a permanent magnet used in the magnetic circuit of a DC solenoid, and when an instantaneous current is applied to the solenoid, the iron core inside the solenoid is attracted and this state is maintained by the permanent magnet. When an instantaneous current of opposite polarity is applied, the holding force of the permanent magnet is weakened and the return spring returns the iron core.

In front of the separation roller 31 and the paper feed roller 33, a part of the paper feed path 11 is formed by guides 28 and 29, and a conveying means such as a registration roller 51 and a pressure roller 54 is provided.
is provided. Note that the registration roller 51 is connected to the motor 5.
6.

And on the entrance side of the registration roller 51 and the pressure roller,
A sensor S2 for detecting a document is also provided.

As shown in FIG. 1, the conveyance path switching unit 13 is provided with a switching flapper 61 and an arm 63 that assists in driving the switching flapper 61 at a branching point between the paper feed path 11 and the paper discharge path 19.

The switching flapper 61 is rotatable about a shaft 65 and is urged downward by a spring 67. Note that the switching flapper 61 is formed of a metal material such as aluminum or iron, a synthetic resin such as plastic, an elastic body such as a synthetic resin film or sheet, and other shapes and attachment methods may be used.

The arm 63 is rotatable about a shaft 69, and has one end that stops receiving the driving force from the conveyance path switching drive unit 15, and the other end that pushes up the switching flapper 61.

The conveyance path switching drive unit 15 includes, for example, an arm 73 that is rotatable about a shaft 71, a tilt/id 75, and a return spring 77.
, Attach the slide arm 79, solenoid 75
The iron core of the solenoid 75 is attracted by the excitation Fa+,
The arm 73 rotates downward, and the slide arm 73 descends to push the arm 63 of the conveyance path switching section 13. The return takes place in return subringua 7.

In the belt conveying section 17, a conveying belt 81 has both ends connected to rollers 83.
．． 85, supported in the middle by a roller 87, and driven by a motor 91 as shown in FIG.

The paper ejection path 19 is provided with paper ejection rollers 82, 86 and pressure rollers 84, 88, and the O1 switching flapper 61 switches the conveyance path to the paper ejection path 19 side and ejects the guided original onto the paper ejection tray 21. It is supposed to be done. The paper ejection rollers 82 and 86 receive driving force from the motor 91. Note that the conveyance speed is set to be lower than the conveyance speed of the conveyor belt 81 by the deceleration mechanism.

The pressure rollers 84 and 88 are normally separated from the paper ejection rollers 82 and 86, and the document is sent into the paper ejection path 19 by the conveyance force of the conveyor belt 81, and the timing when the trailing edge of the document leaves the conveyor belt 81 (motor 91 14 years since the start of the reversal
time), the solenoid 93 causes the paper ejection roller 82.8 to
6, and the document ejection speed is 82.86.
The rotation of the paper switches the speed to low, and the paper is ejected from the paper ejection slot.

Note that a sensor S3 for detecting a document is provided at the paper discharge port.

With the above configuration, the operation of this automatic document feeder will be explained with reference to the timing chart of FIG. 16.

First, when a document P is set on the document tray 7 with its surface facing downward, the sensor S1 detects the document P, and automatic feeding of the document P becomes possible.

When the paper feed button is pressed in this state, the latching solenoid 52 and solenoid 32 shown in FIG. 2 are energized. Excitation of the solenoid 52 causes the lever 55 to rotate counterclockwise as shown in FIG. 3. Therefore, the pickup roller 47 falls onto the document P.

Furthermore, the shaft 57 rotates clockwise due to the excitation of the solenoid 52, and the set stopper 59 rotates upward. Accordingly, the gate for the original P is opened and paper can be fed. Furthermore, the separation roller 31 is brought into pressure contact with the paper feed roller 33 by the excitation of the solenoid 32 .

When the pickup roller 47 comes into contact with the document P on the document 1-lay 7, the motor 27 can start rotating. Due to this,
The paper feed roller 33' and the pickup roller 47 rotate in the paper feeding direction, and the separation roller 31 rotates in the opposite direction to the paper feeding direction.

The original on the tray 7 is sent out by the rotation of the pickup roller 47, and is fed by the paper feed roller 33 while the separation roller 31 removes the original following below this original.

Then, the sensor S2 detects the leading edge of the paper, and the leading edge of the document is brought into contact with the contact portion between the registration roller 51 and the pressure roller 54. Since the paper feed roller 33 is still feeding the document while the leading edge of the document is locked, the document is bent.
The leading edge of the document is registered.

The solenoid 32 and the motor 27 are de-energized T1 hours after the sensor S2 detects the leading edge of the document.

Therefore, the motor 27 is stopped, the feeding of the original is stopped, and the separation roller 31 is separated from the paper feeding roller 33 as shown in FIG.

Therefore, the document, which has been retained by the front mk registration roller 51 and the pressure roller 54 and has a deflection formed by being retained by the separation roller 31 and the paper feed roller 33 in the middle, is As a result of the separation, the deflection is held by the pickup roller 47.

Motor 56.9 12 hours after sensor S2 turns on
At the same time, the solenoid 52 is reversely excited.

This causes the registration roller 51 and the conveyor belt 81 to rotate, and the pickup roller 47 to rise.

The registered original is sent out by the rotation of the registration roller 51, and when it reaches the platen glass 3, it is conveyed over the platen glass 3 by the conveyance belt 81 in the left direction in the figure. Then, the original P hits the stopper 4 and is set at the basic position.

After T3 hours after the motor 91 starts rotating, the motor 91
to stop.

The rotation of the conveyor belt 81 also stops due to the stiffness.

Copying is performed in this state, and when the copying is completed, the motor 91 is rotated in the reverse direction and the solenoid 75 is energized.

Note that when copying is started, the latching solenoid 52 is energized and feeding of the next document is started.

By reversing the motor 91, the conveyor bell 1-81 moves on the platen glass 3 in the right direction in the figure.

Furthermore, the slide arm 79 is lowered by the excitation of the slide/id 75, and one end of the arm 63 is pushed down. Therefore, the other end rises and pushes up the switching flapper 61. Therefore,
The document conveyed rightward by the conveyance belt 81 is guided by the switching flapper 61 and sent to the paper discharge path 19 fL.

When the sensor S3 detects the document sent to the paper discharge path 11, the solenoid 75 is turned off and the flapper 61 is returned to its original position.

Then, 14 hours after the motor 91 is reversed, the solenoid 93 is energized, the pressure rollers 84.88 are brought into pressure contact with the paper discharge rollers 82.86, and the paper is discharged at the rotational speed of the paper discharge rollers 82.86.

That is, the document that was being discharged at the same speed as the conveyor belt 81 changes its discharge speed at the timing when the trailing edge of the document separates from the conveyor belt 81, and is discharged at a low speed.

Therefore, the alignment of the originals ejected to the paper ejection trays 1 to 21 is improved.

When sensor S3 detects the trailing edge of the document, solenoid 93
is turned off and the pressure rollers 84 and 88 return to their original positions. Further, the next document that has been sent out first is fed onto the platen glass 3.

In this way, multiple sheets of originals are automatically graded. sent out,
Copied and ejected.

If you want to set the originals one by one on the platen glass 3 manually, open the cover 〇 around the hinge, place the original on the platen glass 3, press the original against the stopper 4, and move it to the reference position. Sera 1-do. Then, close the cover 〇 again and press the copy button to copy.

According to the above embodiment, the following effects can be obtained.

(1) A state in which the pickup roller 47 is brought into contact with the document on the tray 7 after the document sent out by the paper feed roller 33 reaches the contact portion between the registration roller 51 and the pressure roller 54 and is deflected. Since the paper feed roller 33 and the separation roller 31 are separated, the pressure contact between the paper feed roller 33 and the separation roller 31 can be made after registering the leading edge of the document without changing the conventional mechanical configuration. Even if 11. The rear of the bent document is held down by the pickup roller 47, the deflection of the document is held, and the leading edge of the document is in contact with the registration rollers 51 and pressure rollers 54 in the registration 1 to registration state, and the registration rollers 51 The document can be sent out reliably when the machine rotates.

(2) After bending and registering the document between the registration roller 51 and the paper feed roller 33, the paper feed roller 33
Release the pressure contact between the separation roller 31 and the registration roller 5.
1 and the pickup roller 47, the distance between the registration roller 51 and the pickup roller 47 is longer than the distance between the registration roller 51 and the paper feed roller 33. Or, the sagging becomes gentle, making it difficult for the original to curl.

(3) Since the latching solenoid 52 is used to drive the pickup roller 47, the pickup roller 4
There is no need to continuously turn on electricity from the time when 7 is lowered to the time when it is raised.

[Modified example]

The present invention is not limited to the above-mentioned embodiment, and for example, the following modifications are possible.

(1) In the embodiment described above, the pickup roller 47 is raised at the same time as the motor 56 rotates.
It may be raised after rotating.

Alternatively, a one-way clutch may be attached to the pickup roller 47, and the document may be transported by the registration rollers 51 while the pickup roller 47 is in contact with the document.

(2) In the above embodiment, the latching solenoid 52 was used to move the pickup roller 47 up and down, but two latching/ids are used, and when one solenoid is energized, this solenoid releases the stopper and causes the pickup roller 47 to move up and down.
When the pickup roller 47 is dropped and the other solenoid is energized, the pickup roller 47 may be raised by this solenoid and stopped by a stopper.

〔Effect of the invention〕

According to the invention described above, there is provided a feeding means for feeding out the paper stored in a tray, a paper feeding means and a separating means that can freely approach and separate from each other and feed the paper fed out by the feeding means without separating it into one sheet. and a conveyance means for conveying the paper fed out by the paper feeding means, after the sheet fed out by the paper feeding means reaches the conveyance means and is bent, After registering the leading edge of the paper, since the feeding means and the separation means are separated from each other while the feeding means is in contact with the paper on the tray.

It is possible to obtain a paper registration method for a paper feeding device in which the deflection of the paper is maintained even when the pressure contact between the paper feeding means and the separating means is released, and the document can be reliably transported by the transporting means.

[Brief explanation of the drawing]

1 to 6 are diagrams for explaining one embodiment of the present invention, in which FIG. 1 is a sectional view showing a schematic configuration of an automatic document feeder, FIG. 2 is an explanatory diagram of a configuration of a feeding separation section, 3 and 4 are explanatory diagrams of the operation of the feeding and separating section, FIG. 5 is an explanatory diagram of the configuration around the paper discharge path, and FIG. 6 is a timing chart. 1... Copy machine 3... Platen glass 4
...Stopper 5 ...Automatic document feeder 7
...Document tray 9 axes...Feeding separation section 11
------Paper feed path 13... Conveyance path switching section 15... Conveyance path switching drive section 17... Belt conveyance section 19 ----- Paper discharge path 211111111111 Paper discharge Tray 31-・Separation roller 33-・・Paper feed roller 47・・Axis・Pickup roller 51・・・Registration roller 54・・・・Pressure roller 13 Label+

Claims (8)

[Claims] (1) a feeding means for feeding out the paper stored in the tray;
A paper feeding device comprising a paper feeding means and a separating means that can freely approach and separate from each other, which feed out the paper fed out by the feeding means while separating it into single sheets, and a conveying means that conveys the paper fed out by the paper feeding means. After the paper fed out by the paper feeding means reaches the conveying means and is bent, the paper feeding means and the separation means are moved with the feeding means in contact with the paper on the tray. 1. A paper registration method for a paper feeding device, characterized in that the paper is separated from the paper. (2) A paper registration method for a paper feeding device according to claim 1, wherein the feeding means is a rotating body that can freely approach and separate from the paper on the tray. Method. (3) In the sheet registration method for a sheet feeding device according to claim 1, the feeding means is a unidirectional rotating body that allows rotation only in the feeding direction of the sheet. Paper registration method for paper devices. (4) A paper registration method for a paper feeding device according to claim 1, wherein the paper feeding means is a rotating body that rotates in a paper feeding direction. (5) In the paper registration method for a paper feeding device according to claim 1, the separation means is a rotating body that rotates in a direction opposite to the paper feeding direction. How to resist. (6) A paper registration method for a paper feeding device according to claim 1, wherein the separating means is a non-rotating member. (7) A paper registration method for a paper feeder according to claim 1, wherein the conveyance means is a pair of rotating bodies pressed against each other. (8) A paper registration method for a paper feeding device as set forth in claim 1, wherein the conveying means includes a rotating body and a non-rotating member that are pressed against each other.