JPS6360821A - Sheet conveying device - Google Patents

Abstract

PURPOSE:To easily correct the skewing or the shifting of position in the width direction of a sheet in a housing part by aligning said sheet before it is caught in between a feeding rotary body and a separating rotary body. CONSTITUTION:Sheets which are inverted by an inverting passage 65 are housed in an intermediate tray 71 by means of a paper discharge roller 69 and sent up to a restricting board 87 by means of an impeller 72 and their ends are aligned. And, only a sheet on the lowest layer is separated off and red to a resist roller 129 by means of a paper feed roller 126 rotated in the conveying direction and a separating roller 127 oppositely rotated to the conveying direction. Thus, by driving the resist roller 129, a separating means 123, and a delivery roller 75, a resist sheet is fed to a sensitive drum 23. And, while the first sheet is passing through the separating roller 127 with its rear end being parted from the delivery roller 75, the second sheet is aligned to the side brake side of the intermediate tray 71 by means of the delivery roller 75.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to copying machines, laser printers, liquid crystal printers,
One sheet processing device is provided, which stores sheets such as copy paper, tracing paper, synthetic resin film, etc. on which images have been formed by an image forming device such as a printing machine into an intermediate tray and then refeeds them to the image forming section. , relates to a sheet conveying device that aligns and sends out sheets.

[Conventional technology]

When making double-sided copies on a sheet using an image forming apparatus such as a double-sided copying machine, the sheet that has been copied on one side is temporarily stored in an intermediate tray, and then fed to the photosensitive drum again to make a copy on the blank side to perform double-sided copying. Is going. In this way, temporarily storing sheets in the intermediate tray is performed not only for double-sided copying but also for single-sided copying and multiplex (multicolor) copying.

[Problem that the invention seeks to solve]

By the way, the intermediate tray is provided with a side plate that regulates the side edges of the sheets so as to be movable according to the sheet size.

However, since the sheets to be stored in the intermediate tray must be fed between the J-id plates, the interval between the plates must be set to be 1 to 2+n+n wider than the width of the sheets.

For this reason, when feeding sheets from the intermediate tray to the photosensitive drum, skew (diagonal feeding) may occur, or sheets may
2+n+n (1) shifted in the width direction, making it impossible to copy at the correct position on the sheet.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet conveying device that can correct skew and positional deviation in the width direction of sheets stored in a sheet storage section and convey the sheets.

[Embodiments of the invention]

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

<Configuration> As shown in FIG. 1, an image forming apparatus such as a double-sided copying machine 1
includes automatic document feeder@3, sheet storage device 5, and sorter 7.
is installed.

Double-sided copying (attack 1 includes an image forming section 2 that copies the original set at the reference position of the platen glass 9 onto a sheet, a paper feed path 41 and 43 that supplies the sheet to this image forming section 2, and an image forming section A conveyance path 5 for conveying the sheet copied in step 2
4, five discharge paths for discharging the sheets conveyed through the conveyance path 54, a paper discharge tray 61 for storing the sheets discharged from the five discharge paths, and a two-tough system for discharging the sheets conveyed through the conveyance path 54. The feeding path 64 and the feeding path 54
a reversing path 65 for reversing the front and back of the sheet conveyed;
It is provided with an intermediate tray 71 that temporarily stores the sheet that has been reversed in the reversing path 65, and a U-turn path 77 that supplies the sheet in the intermediate tray 71 to the image forming section 2 again.

Further, a switching date 57 is provided at a branching portion 55 where the conveying path 54 branches into a discharge path 59 and a reversing path 65.

The reversing route 65 is, for example, a switchback route, and a switching piece 67 made of flexible synthetic resin, such as a polycarbonate resin sheet (trade name: Mylar), is provided at the portion where the conveyance route is switched by the switchback. It is set up.

A paper discharge roller 69 is provided at the paper discharge port of the reversing path 65.

The intermediate tray 71 has seven plates for regulating the side edges of the sheets as shown in FIGS. 2 and 3.

81 is provided. The side plates 7 serve as reference surfaces and are fixed, but the side plates 81 are adapted to move along the guide holes 80 depending on the sheet size.

That is, a rack 111 is attached to the side plate 81, and a pinion 113 is engaged with the rack 111. The motor 11 is attached to this pinion 113.
A rotary shaft No. 5 is attached and driven in forward and reverse directions by signals from a control section (not shown).

A blade 72 is provided on the intermediate tray 71 to allow the sheets supplied to the intermediate tray 71 to reach the regulating plate 87.

At the bottom of the intermediate tray 71, sheets are placed on the side plate 7.
A feeding means for aligning the 9 side, for example a half-moon shaped feeding roller 75, is arranged obliquely.

A stopper 117 is provided at the paper feed port from the intermediate tray 71 to the LJ turn path 77.

The paths 41, 43, 77 are provided with separating means 119, 1211, 123 for separating the sheets into one sheet. These separating means 119, 121, 123 include a feeding rotary body, such as a paper feeding roller 125, which rotates in the sheet conveyance direction;
A separation soft body, for example, a separation roller 127, which rotates in a direction to remove the sheet following the sheet conveyed by the paper feed roller 125, is disposed to face the sheet.

The path 77 is provided with a sensor S1, and the path 4
A sensor S2 and a conveying means, such as a registration roller 129, are provided at the confluence section of No. 1, 43, and 77.

On the other hand, the automatic document feeder 3 includes a document tray 89, a separating section 91, a transport section 91, a reversing section 95, a paper ejection section 97, and a paper ejection tray 99, and is capable of transporting not only single-sided originals but also double-sided originals. It is now possible to do so.

Further, the sheet storage device 5 has a larger capacity than the paper feed cassette 35, and the hopper 101 is raised by the lifting device 103 according to the amount of sheet reduction. The sheet storage device 5 is equipped with casters so that it can be moved on the floor and placed in front of the double-sided copying machine 1.

The sorter 7 includes a plurality of trays 105 and can sort sheets by number of copies.

<Operation> In the above configuration, this device operates as follows.

The automatic document feeder 3 feeds the document onto the platen, and when the platen is set at the reference position, the copying operation is started. The document on the platen glass is illuminated by an illumination lamp 11, and the reflected light passes through a first moving mirror 13, a second moving mirror 15, a lens 17, a first fixed mirror 19, a second fixed mirror 21, etc. An image is formed on the photosensitive drum 23. By the way, the illumination lamp 11 and the movable mirror 13 of @1 are integrally constructed, and while the document is being illuminated, the entire body moves at a speed of
At the same time, the second movable mirror 15 moves to the right at a speed of 1/2 and moves from the original to the photosensitive drum 23.
The optical path length to the top is always kept constant.

The surface of the photosensitive drum 23 has a photosensitive member whose photosensitive layer is covered with a transparent insulating layer, and this photosensitive member is first positively charged by the primary charger 25 .

Subsequently, when reaching the exposure section 27, the photoreceptor is exposed to the original image and at the same time is subjected to AC charge removal by the secondary charger 29. Next, an electrostatic latent image is formed on the drum surface (photoreceptor) by being exposed to light from the full surface exposure lamp 31, and enters the development area.

In the development area, the electrostatic latent image is visualized by a developer 33 using powder.

Next, the sheet from the paper feed cassette 35 or the sheet storage device 5 is sent out by the paper feed roller 37 or 39, and the sheet sent through the paper feed path 41 or 43 is brought into close contact with the drum 23, and transferred to the photosensitive drum 23 by the transfer charger 45. The upper image is transferred onto the surface of the sheet. After copying, the sheet is separated from the photosensitive drum 23 and guided to a fixing device 47, where the image attached to the surface is fixed. After fixing, the surface charge of the sheet is removed by four static eliminators, and the sheet is transferred to the conveying roller 51.
, 53 along the conveyance path 54. The conveyance path of the sheet that has reached the branching portion 55 is divided depending on whether the final copy form is one-sided copying or double-sided copying.

When the final copy form is single-sided copying, the switching gate 57 is positioned downward as shown in FIG. 1, and the sheet is fed in the direction of the discharge path 59. If this sheet does not require sorting, it is discharged onto a paper discharge tray 61 by a discharge roller 60. When sorting is required, the switching gate 63 is rotated to supply the material to the conveyance path 64 and accommodate it in the sorter 7 .

On the other hand, when the final copy form is double-sided copying, the switching gate 57 is switched. This allows the sheet to move to the reversing path 6.
5.

The sheet that has been reversed by the reversing path 65 is discharged from the paper discharge roller 69 onto the intermediate tray 71, and is accommodated between the side trays 79 and 81.

Further, the sheets supplied to the intermediate tray 71 are transferred to the impeller 7
2, it is sent to the regulating plate 87 and its tips are aligned.

When this operation is repeated for the necessary number of copies and the sheets of the last few copies of the same original are stored in the intermediate tray 71, the stopper 71
A feeding roller 75, which is disposed diagonally, rotates with 7 blocking the paper feed port. At this time, the first sheet P1 is fed obliquely toward the seven side plates.

When the stopper 77 is retracted and the paper feed port is opened, a plurality of sheets enter the paper feed port. While the sheet reaches the separating means 123, the bottom paper P1 is further diagonally fed toward the side plate 79, and passes along the side plates 1 and 7 to the separating means 123.
supplied to

A paper feed roller 125 rotates in the sheet conveyance direction, and a separation roller 1 rotates in the direction of reversing sheet conveyance.
27, the bottom paper P1 and the paper P2 that follows this bottom paper P1 are separated, and only the bottom paper P1 is sent out.
The registration roller 12 is moved while the tip is detected by the sensor S1.
9.

At this time, since the second and subsequent sheets P2 are rejected by the separation roller 127, they are not caught between the paper feed roller 125 and the separation roller 127, and are in a state where alignment is possible.

When the sensor S2 detects the leading edge of the sheet P1, the driving of the separating means 123 and the feeding roller 75 is stopped r1- after a predetermined time. As a result, the sheet P1 is deflected and registered with its leading end being stopped by the registration rollers 129.

When the paper feed signal is issued, the reno roller 129, the separating means 12: and the feed roller 75 are driven to supply the registered sheet to the photosensitive drum 23.

When the rear end of the first sheet P1 comes off the feed roller 75, the feed roller 75 applies a diagonal feeding force to the second sheet P2.

Also, when the rear end of the first sheet P1 comes off the feed roller 75 and passes the separation roller 127, it is the second sheet)
P2 is removed by the separating roller 127 and becomes free, and during this time, it is aligned to the side plate 79 by the feeding roller 75.

Paper feed roller 1 after sensor S1 detects the leading edge of the sheet
When the rotation amount of 25 reaches the amount corresponding to the sheet size,
The second sea) P2 reaches Reno Stroller 129!
In the evening, the separating means 123 and the feeding roller 75 are stopped for a predetermined period of time to form a gap between the first sheet P1 and the second sheet P2.

After the first sheet is removed from the registration rollers 129, the second sheet is sent to the registration rollers 129 and registered.

The same applies to the third and subsequent sheets.

The sheet is fed to the photosensitive drum 23 and copied onto the back side. The sheet that has been double-sided copied in this way is placed in the output tray 6.
Accommodated in one or two tough.

<Effects of Embodiment> According to this embodiment described above, the registration roller 12
When feeding the sheet to the photosensitive drum 23 in step 9, the separating means 1
23 and the feeding roller 75 are also driven to feed the paper feed roller 1.
25 and the separation roller 127, the rear end of the sheet is conveyed while being separated by the separation roller 127. Since the side edge of the next sheet fed out by the roller 75 is aligned with the side plate 79, the next sheet is aligned by the feeding roller 75 before being gripped by the paper feed roller 125 and separation roller 127. become.

For this reason, the side plates 79, 81 of the intermediate tray 71
It is possible to feed sheets while correcting the skew and positional deviation in the width direction of the sheets accommodated in between.

Therefore, the interval between the side plays) 79 and 81 can be set to be wider than the sheet width, making it easier for the seat to be accommodated between the side plays) 79 and 81.

[Modified example]

An embodiment of the present invention has been described above, but the present invention is not limited to the embodiment described above, and for example, the following modifications are possible.

(1) The combination of the feeding rotary body and the separating rotary body is not limited to a pair of rollers, but may also be a combination of belts or belts and rollers. Further, the feeding means may be a belt or the like.

(2) In the embodiment described above, the present invention was applied to the paper refeeding section of a double-sided copying machine, but it can also be applied to the separation section 91 of the automatic document feeder 3, etc.

(3) In the above embodiment, the paper is fed from the bottom sheet, but the present invention can also be applied to a system where the feeding means is located at the second sheet and the paper is fed from the top sheet.

〔Effect of the invention〕

In summary, the present invention provides a sheet conveying device that supplies a sheet, on which an image has been formed in an image forming section and has been stored in a sheet storage section, to the image forming section again. A feeding device that feeds out obliquely toward a reference plane provided along the conveyance direction, a feeding rotary body that conveys the sheet fed out by the feeding device, and a feeding rotary body that follows the sheet conveyed by the feeding rotary body. a separating rotary body for repelling the sheet, the rear end of the sheet being conveyed while being separated by the feeding rotary body and the separating rotary body passes through the feeding means, and then the separating rotary body and the feeding rotary body Since the side edge of the next sheet fed out by the feeding means is aligned with the reference plane before passing through the sheet gripping portion by the body, the sheet is not separated from the feeding rotating body and the separating rotating body. It is possible to obtain a sheet conveying device that can easily correct skew and widthwise positional deviation of the sheet stored in the sheet storage portion by aligning the sheet before being held in the sheet storage portion.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams showing one embodiment of the present invention.
This figure shows the structure of a double-sided copying machine, and FIGS. 2 and 3 show the structure around the intermediate tray. 1... Double-sided copying 8! 3... Automatic document feeder 5.
... Sheet storage device 7 ... Sorter 23 ... Photosensitive drum 65 ... Reversing path 69 ... Paper ejection roller 7
1... Intermediate tray 75... Paper feed roller 77...
・U-turn path 123...Paper feed roller -27
...Separation roller

Claims (2)

[Claims] (1) In a sheet conveying device that supplies a sheet, on which an image has been formed in an image forming section and has been stored in a sheet storage section, to the image forming section again, the sheet that has been stored in the sheet storage section is moved in the sheet conveyance direction. A feeding device that feeds out obliquely toward a reference surface provided along the sheet, a feeding rotating body that conveys the sheet fed out by the feeding device, and a sheet that follows the sheet conveyed by the feeding rotating body. a separating rotary body, the rear end of the sheet being conveyed while being separated by the feeding rotary body and the separating rotary body passes through the feeding means, and then the rear end of the sheet is separated by the feeding rotary body and the separating rotary body. A sheet conveying device characterized in that a side edge of the next sheet fed out by the feeding means is aligned with the reference surface until the sheet passes through a sheet gripping portion. (2) In the sheet conveying device according to claim 1, while the separating rotary body is rejecting the sheet following the sheet conveyed by the feeding rotary body, the feeding means moves the next sheet A sheet conveying device characterized in that a side edge of the sheet is aligned with the reference surface.