JPH057290B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention is applicable to copying machines, image readers, laser printers, liquid crystal printers, ion printers,
The present invention relates to a paper registration method for a paper feeding device, in which papers such as manuscripts and copy sheets are separated and fed one by one to an image processing device such as a printing machine using a separating means and a paper feeding means that face each other.

[Technical background of the invention]

Conventionally, a paper feed device that supplies a document onto a platen glass of an image processing device, for example, a copying machine, has two paper feed rollers that feed the document on a document tray using a pick-up roller and rotate in opposite paper feeding directions.
The document is fed to a separation roller that rotates in the opposite direction to the paper feeding 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 send it out.

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 registration rollers are rotated to send the original onto the platen glass, set at a 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.
Dirt on the rollers may adhere to the original.

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 not bend and the leading edge of the document will separate from the registration rollers.

As a result, it becomes impossible to feed the document using the registration rollers.

[Purpose of the invention]

In this invention, after registering the leading edge of the paper,
A paper feed that maintains the deflection of the paper even when the pressure between the paper feed means such as the paper feed rollers and the separation means such as the separation rollers is released, and the document can be reliably transported by the transport means such as the registration rollers. The purpose is to obtain a paper registration method for the device.

[Summary of the invention]

In order to achieve the above object, the present invention provides a feeding means for feeding paper, a paper feeding means and a separation means for feeding the fed paper while separating it into one sheet, which can freely approach and separate from each other, and conveying the fed paper. In the paper feeding apparatus, the leading edge of the paper fed out by the paper feeding means reaches the transporting means and bends. After the sheet is formed, the paper feeding means and the separating means are separated from each other while the feeding means is in contact with the rear part of the fed paper remaining on the tray.

[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 and serves 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 conveyance path switching section 13,
It is equipped with a conveyance path switching drive section 15, a belt conveyance section 17, a paper ejection path (reversing path) 19, a paper ejection tray 21, etc., and can automatically feed and eject the document P. The other parts are integrated into the cover C and attached to the back of the copying machine 1 via a hinge 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 separation means such as a separation roller 31 and a paper feed means such as a paper feed roller 33 are arranged to face 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 is rotated by the motor 27 in a direction opposite to the paper feeding direction (clockwise in the figure). The motor 27 rotates the paper in the paper feeding direction (clockwise in the drawing).

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 pick-up 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.

In addition, near the pick-up roller 47, as shown in FIG.
1 is installed.

Above the arm 43, there is a latching (keep)
A lever 55 is provided which is mounted on a shaft 53 driven by a solenoid 52. This lever 55 supports the locking portion 41 and locks the rotation of the arm 43.

Further, a set stopper 59 is provided which is attached to a shaft 57 driven by a latching solenoid 52, and when the set stopper 59 is lowered, the paper feed path 11 of the original P is
prevent intrusion.

In the latching solenoid 52, for example, a permanent magnet is used in parallel with 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 that state is maintained by the permanent magnet.
At the time of return, when an instantaneous current of opposite polarity to that at the time of attraction is applied to the solenoid, 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 is provided.
and a pressure roller 54 are provided. Note that the registration roller 51 is driven by a motor 56.

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

As shown in FIG. 1, the conveyance path switching section 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, or an elastic body such as a synthetic resin film or sheet, and may have other shapes and attachment methods.

The arm 63 is rotatable about a shaft 69, receives the driving force from the conveyance path switching drive section 15 at one end, and pushes up the switching flapper 61 at the other end.

For example, a solenoid 75, a return spring 77, and a slide arm 79 are attached to an arm 73 rotatable about a shaft 71 in the conveyance path switching drive unit 15, and when the solenoid 75 is energized, the solenoid 75 is
The iron core is attracted, the arm 73 rotates downward, and the slide arm 73 descends to push the arm 63 of the conveyance path switching section 13. Return is performed by a return spring 77.

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

The paper ejection path 19 is provided with paper ejection rollers 82 and 86 and pressure rollers 84 and 88, and the conveyance path is switched to the paper ejection path 19 side by the switching flapper 61, and the guided original is ejected to the paper ejection tray 21. It's becoming like that. The paper discharge rollers 82 and 86 receive driving force from a motor 91. Note that the conveyance speed is set lower than the conveyance speed of the conveyor belt 81 by the deceleration mechanism.

The pressure rollers 84 and 88 are usually the paper ejection roller 8.
2, 86, the document is sent into the paper ejection path 19 by the conveyance force of the conveyor belt 81, and at the timing when the trailing edge of the document leaves the conveyor belt 81 (T4 hours after the motor 91 starts reverse rotation), The solenoid 93 presses against the paper ejection rollers 82 and 86, and the ejection speed of the document is switched to a low speed by the rotation of the paper ejection rollers 82 and 86, so that the document is ejected from the paper ejection port.

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.

If you press the paper feed button in this situation,
Latching solenoid 52 and solenoid 32 of FIG. 2 are energized. Excitation of the solenoid 52 causes the lever 55 to rotate counterclockwise as shown in FIG. 3. Therefore, the pick-up 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. Therefore, the gate for the original P is opened, and the 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 pick-up roller 47 comes into contact with the document P on the document tray 7, the motor 27 is rotated.
As a result, the paper feed roller 33 and the pick-up roller 47 rotate in the paper feeding direction, and the separation roller 31 rotates in the opposite direction to the paper feeding direction.

Tray 7 is rotated by the pick-up roller 47.
The upper document is sent out, and the paper feed roller 33 feeds the document while the separation roller 31 rejects the document that follows below this document.

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 feeds the original while the leading edge of the original is locked, the original is bent and the leading edge of the original is registered.

The energization of the solenoid 32 and the motor 27 is stopped T1 hours after the sensor S2 detects the leading edge of the document.

Therefore, the motor 27 stops, the feeding of the document stops, and the separation roller 31 moves to the paper feeding roller 33.
It is separated from the center as shown in Fig. 4.

Therefore, the original document, which has a bend in which the leading edge is held by the registration roller 51 and the pressure roller 54 and the middle part is held by the separation roller 31 and the paper feed roller 33, is removed from the paper feed roller 33 of the separation roller 31. Due to the separation, the deflection is held by the pick-up roller 47.

After T2 hours after the sensor S2 is turned on, the motors 56 and 91 are rotated, and the solenoid 52 is turned on.
to reverse excite. As a result, the registration roller 51,
The conveyor belt 81 rotates, and the pick-up roller 4
7 rises.

The registered original is sent out by the rotation of the registration rollers 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 reference position.

The motor 91 is stopped after T3 hours after the motor 91 starts rotating.

This also stops the rotation of the conveyor belt 81.

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.

The reversal of the motor 91 causes the conveyor belt 81 to move over the platen glass 3 in the right direction in the figure.

Furthermore, the slide arm 79 is lowered by the excitation of the solenoid 75, and one end of the arm 63 is pushed down. Therefore, the other end rises and the switching flapper 61
push up. Therefore, the document transported rightward by the transport belt 81 is guided by the switching flapper 61 and sent to the paper discharge path 19.

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

Then, after T4 hours after reversing the motor 91, the solenoid 93 is energized, and the pressure rollers 84, 8
8 is pressed against the paper ejection rollers 82 and 86, and the paper is ejected at the rotational speed of the paper ejection rollers 82 and 86.

That is, the document, which has been discharged at the same speed as the conveyor belt 81, is discharged at a low speed by switching the discharge speed at the timing when the trailing edge of the document leaves the conveyor belt 81.

Therefore, the alignment of the documents discharged onto the paper discharge tray 21 is improved.

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

In this way, a plurality of originals are automatically sent out, copied, and then ejected.

If you want to set the originals one by one on the platen glass 3 manually, open the cover C 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. Set. Then, close the cover C again and press the copy button to copy.

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

(1) After the document sent out by the paper feed roller 33 reaches the contact area between the registration roller 51 and the pressure roller 54 and is bent, the pick-up roller 47 is brought into contact with the document on the tray 7. Since the paper feed roller 33 and separation roller 31 are separated, the leading edge of the document can be registered without changing the conventional mechanical configuration.
Even if the pressure contact between the paper feed roller 33 and the separation roller 31 is released, the registration roller 51 and the pressure contact roller 5
The rear of the document, which is bent due to the front end of the document being locked at the contact portion with the pick-up roller 47, is held down by the pick-up roller 47, and the deflection of the document is maintained.
In the registered state, the leading edge of the document is in contact with the registration roller 51 and the pressure roller 54, so that the document can be reliably sent out when the registration roller 51 rotates.

(2) After bending and registering the document between the registration roller 51 and paper feed roller 33, the pressure contact between the paper feed roller 33 and separation roller 31 is released;
Registration roller 51 and pick-up roller 47
Since the deflection of the document is held between the document rollers 51 and 47, the distance between the registration rollers 51 and the pick-up roller 47 is longer than the distance between the registration rollers 51 and the paper feed roller 33, and the deflection is gradual. This makes it difficult for the original to curl.

(3) Since the latching solenoid 52 is used to drive the pick-up roller 47, it is not necessary to continuously energize the pick-up roller 47 from when it is lowered to 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 pick-up roller 47 is raised at the same time as the motor 56 rotates, but it may be raised after the motor 56 rotates.

Also, a one-way clutch is attached to the pick-up roller 47, and when the pick-up roller 47 is in contact with the document, the registration roller 51 is
Transport may also be carried out by

(2) In the above embodiment, the latching solenoid 52 was used to move the pick-up roller 47 up and down, but two solenoids are used, and when one solenoid is energized, this solenoid releases the stopper and moves the pick-up roller 47. let it fall,
When the other solenoid is energized, this solenoid raises the pick-up roller 47 and may lock it with a stopper.

〔Effect of the invention〕

A feeding device for feeding paper, a paper feeding device and a separating device that feed the fed paper while separating it into one sheet, and a paper feeding device and a separation device that can freely approach and separate from each other, and a conveyance device for conveying the fed paper, and the conveyance device In a paper feeding device in which the distance between the sheet and the feeding means is smaller than that of the smallest size paper, the leading edge of the sheet fed by the paper feeding means reaches the conveying means and is bent, and then the feeding means is moved. Since the paper feeding means and the separating means are separated from each other while in contact with the rear part of the fed paper remaining on the tray, the pressure contact between the paper feeding means and the separating means is released. Not only does the paper retain its sagging and the feeding position does not go out of order, but also
The deflection is gentle and does not cause curling of the paper, and the deflection when the pressure is released ensures that the paper is bitten into the conveying means reliably and accurately, ensuring reliable and timely conveyance, and separation. Since it is completely free from the means, the paper will not be soiled and the feeding timing will not be disturbed due to slips.

[Brief explanation of drawings]

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, FIGS. 3 and 4 are explanatory diagrams of the operation of the feeding and separating section, and FIG. 5 is an explanatory diagram of the configuration around the paper ejection path.
Figure 6 is a timing chart. 1... Copy machine, 3... Platen glass, 4...
Stopper, 5... Automatic document feeder, 7... Original tray, 9... Feeding separation section, 11... Paper feed path, 13... Conveyance path switching section, 15... Conveyance path switching drive section, 17... Belt conveyance unit, 19... Paper discharge path, 21... Paper discharge tray, 31... Separation roller,
33... Paper feed roller, 47... Pick up roller, 51... Registration roller, 54... Pressure roller.

Claims (1)

[Scope of Claims] 1. A feeding device for feeding paper stored in a tray, a paper feeding device and a separating device that feed the paper fed out by the feeding device while separating it into single sheets, which are movable toward and away from each other; A paper feeding device comprising: a conveying means for conveying the paper fed out by the paper feeding means, and in which the distance between the conveying means and the feeding means is smaller than the minimum size paper; After the leading edge of the paper reaches the conveyance means and a deflection is formed, the paper feeding means and the separation means are connected to each other while the feeding means is in contact with the rear part of the fed paper remaining on the tray. 1. A paper registration method for a paper feeding device, characterized by separating the paper from each other. 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. 3. In the paper registration method for a paper feeding device according to claim 1, the feeding means is a unidirectional rotating body that allows rotation only in the feeding direction of the paper. paper registration method. 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. A paper registration method for a paper feeding device according to claim 1, wherein the separating means is a rotating body that rotates in a direction opposite to the paper feeding direction. . 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 sheet registration method for a sheet feeding device 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 according to claim 1, wherein the conveying means includes a rotating body and a non-rotating member that are pressed against each other.