JP4366006B2 - Sheet conveying apparatus and sheet processing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet processing apparatus that reads an image of a document or forms an image on a sheet, such as a scanner, a copier, a printer, or a facsimile machine, and particularly, a sheet provided in these apparatuses. The present invention relates to a sheet conveying apparatus for conveying a sheet.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as this type of sheet processing apparatus, for example, an image reading apparatus is provided with an original processing apparatus that is an example of an automatic sheet conveying apparatus that can be opened and closed in order to automatically feed a document as a sheet to the image reading apparatus. There is. In the image reading apparatus, the document automatically fed by the document processing apparatus is exposed to read the image of the document.
[0003]
Here, as this exposure method, there is a method (hereinafter referred to as “fixed reading”) in which an exposure operation is performed by temporarily stopping the original after the original is conveyed on the platen glass by the original processing apparatus and then moving the exposure apparatus. There is a method of performing an exposure operation by fixing an exposure apparatus at an exposure reading position and moving an original on a platen glass at a predetermined speed (hereinafter referred to as “flow-reading”).
[0004]
Since this scanning can shorten the document stop time, there is an advantage that the document replacement speed can be increased, and this technique is used in many products.
[0005]
[Problems to be solved by the invention]
However, in the case of the prior art as described above, the following problems have occurred.
[0006]
While the document is being conveyed, dust such as toner dust or paper dust is generated due to the rubbing between the image surface of the document and the guide. When this dust adheres to the conveyance roller pair R, the dust accumulates on the driven roller, and the accumulated dust may fall into the conveyance path again due to sliding friction with the document and be conveyed along with the document.
[0007]
In addition, there is known a method of providing a scraper on the driven roller to prevent the above-mentioned dust adhesion, but the scraper has a cleaning effect on the surface of the driven roller, but the dust collected by the scraper is collected in the vicinity. The document processing apparatus may fall into the transport path again due to a shock of the opening / closing operation of the document processing apparatus or the opening / closing operation of the opening / closing cover, and may be transported together with the document.
[0008]
When these dusts are conveyed to the reading unit of the image reading device that performs the flow reading and the dust stays or adheres on the reading position of the platen glass, the exposure device is fixed in the image reading device that performs the flow reading, There is a problem that streaks occur in the document transport direction of an image that is recognized and output as a line at that position.
[0009]
The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is to provide a high-quality sheet conveying apparatus capable of preventing image quality deterioration and sheet contamination due to foreign matter and It is to provide a sheet processing apparatus.
[0010]
[Means for Solving the Problems]
In the present onset Akira In order to achieve the above object,
A first sheet transport rotating member that transports the sheet along the sheet transport path;
A second sheet conveying rotating member that is provided downstream of the first sheet conveying rotating member in the sheet conveying direction and conveys the sheet along the sheet conveying path;
An upper cover member, and a lower cover member disposed with a space with respect to the upper cover member, and an openable and closable cover,
With
From the space between the upper cover member and the lower cover member, a part of the first sheet transport rotating member and a part of the second sheet transport rotating member have holes formed in the lower cover member. A sheet conveying apparatus in which the first sheet conveying rotating member and the second sheet conveying rotating member are arranged so as to protrude into the sheet conveying path via
The sheet conveying apparatus is
A first abutment member for scraping off foreign matter adhering to the first sheet conveying rotary member in contact with said first sheet conveying rotary member,
A second abutting member that abuts on the second sheet conveying rotating member and scrapes off foreign matter adhering to the second sheet conveying rotating member;
An adhesive member for adhering foreign matter scraped off by the first contact member and the second contact member ;
Equipped with a,
The adhesive member, of the surface facing the space in the lower cover member, characterized that you have provided over between the second sheet conveying rotary member and the first sheet conveying rotary member.
[0014]
The adhesive member, it is also suitable with strong and adhesion have foreign matter adhering portion Ru is adhered foreign matter, and a sticking part sticking with a small force to the lower cover member PSA member is provided, the.
It is also preferable that the adhesive member is further provided in a region on the upstream side in the sheet conveyance direction with respect to the first sheet conveyance rotation member in a surface of the lower cover member facing the space.
It is also preferable that the adhesive member is further provided on a surface of the upper cover member that faces the space.
[0015]
The sheet conveying rotation member conveys a sheet to a predetermined position in the sheet conveying path,
Sheet stacking means for stacking sheets conveyed by the sheet conveying rotation member;
Sheet discharge stacking means for discharging and stacking the sheet transported to the predetermined position by the sheet transport rotating member;
It is also suitable to provide.
[0016]
In the sheet processing apparatus, the sheet conveying apparatus described above,
At least one of an image forming unit that forms an image on a sheet and an image reading unit that reads image information of the sheet;
It is characterized by providing.
[0017]
The predetermined position is preferably a reading position at which the image reading unit reads image information on a sheet.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in this embodiment should be appropriately changed according to the configuration of the apparatus to which the invention is applied and various conditions. It is not intended to limit the scope to the following embodiments.
[0019]
In the present embodiment, a document processing apparatus is taken as an example of a sheet (automatic) conveying apparatus provided in an image reading apparatus as a sheet processing apparatus, and FIG. 1 shows a schematic diagram of the document processing apparatus and the image reading apparatus.
[0020]
The document processing apparatus 101 is installed above the image reading apparatus 102 via a hinge unit 104, and conveys a document as a sheet to a reading position (predetermined position) e of the image reading apparatus 102. The image reading apparatus 102 includes a platen glass (small) 8, a platen glass (large) 15, a jump table 10, and an exposure device 103, and performs an exposure operation of a document conveyed from the document processing device 101 by the exposure device 103.
[0021]
Next, a schematic sectional view of a document processing apparatus 101 as a sheet conveying apparatus to which the present invention is applied is shown in FIG. 2, and a method for conveying a single-sided document will be described.
[0022]
The document stacking unit A has a stacking tray 1 as a sheet stacking unit, and stacks documents on the surface of the stacking tray 1.
[0023]
In the document feeder B, the pickup roller 2 pulls a bundle of documents stacked on the stacking tray 1 into a separation unit (consisting of a sheet feed roller 3a and a friction separation pad 3b), and the sheet feed roller 3a and the friction separation pad. 3b separates the top sheets of the original bundle one by one and conveys them to first registration rollers 4a (driven rotation member , first sheet conveyance rotation member ) and 4b (drive rotation member) as sheet conveyance rotation members .
[0024]
The first registration rollers 4a and 4b are stopped when the leading edge of the document arrives, and a loop is formed by the conveyance of the paper feed roller 3a to correct skew feeding, and then the document is conveyed to the document conveying portion C.
[0025]
In the document conveying section C, the document conveyed from the document feeding section B is fed with a lead roller 6 (drive rotation member, sheet conveyance rotation member), a second registration roller 5 (driven rotation member, second sheet conveyance rotation member), and a lead roller I7. The lead roller II12 conveys the platen glass (small) 8 and the white plate 9 to the document discharge section D at a predetermined speed. At this time, the exposure apparatus 103 is fixed under the reading position e on the platen glass (small) 8, and an exposure operation is performed.
[0026]
In the document discharge section D, while the exposure operation is performed at the reading position e, the discharge rollers 13a and 13b as the sheet discharge stacking means are separated from each other, but the document trailing edge passes through the reading position e and reads. Is finished, the discharge roller 13b moves upward, the original is nipped by the discharge roller 13a and the discharge roller 13b, and the back side onto the discharge tray 14 as the sheet discharge stacking means of the discharge stacking section E. Discharge.
[0027]
Next, a method for conveying a double-sided document in the present embodiment will be described.
[0028]
First, the originals stacked on the original stacking part A are separated one by one by the original feeding part B and conveyed to the original conveying part C.
[0029]
In the document conveying section C, the sheet is conveyed between the platen glass (small) 8 and the white plate 9 to the document discharge section D at a predetermined speed as in the case of one side. At this time, the exposure apparatus 103 is fixed under the reading position e, and the exposure operation for the first surface is performed.
[0030]
In the document discharge section D, after the document trailing edge passes through the discharge sensor S1, the discharge rollers 13a and 13b reversely rotate and pass through the reverse path 20, and the document is conveyed in the direction opposite to the discharge direction. The document is switched back and conveyed to the second registration roller 5 of the section C.
[0031]
The second registration roller 5 is stopped when the leading edge of the document arrives, forms a loop by driving the discharge rollers 13a and 13b, performs skew correction on both sides, and transports the document in the same manner as the first side. After the exposure operation for the second surface is performed in the part C, the sheet is conveyed to the document discharge part D.
[0032]
Due to the configuration of the document processing apparatus 101 according to the present embodiment, the document discharge unit D is re-inverted because the document is face-up after the second page is read and the order of the discharged document is out of order. There is a need to do.
[0033]
Therefore, in the document discharge section D, after the trailing edge of the document passes through the discharge sensor S1, the discharge rollers 13a and 13b are reversed to transport the document again toward the document transport section C. At this time, since the document conveying section C performs only the reverse operation of the document surface in order to discharge the back surface, the second registration roller 5 does not perform the skew correction.
[0034]
The document that has passed through the document transport unit C is transported again to the document discharge unit D, nipped by the discharge rollers 13a and 13b, and discharged on the back side onto the discharge tray 14 of the discharge stacking unit E.
[0035]
Next, the structure of the adhesive sheet in this Embodiment is demonstrated using FIG. 3, FIG.
[0036]
In the present embodiment, the rollers as sheet conveyance rotating members corresponding to the conveyance roller pair R in the problem section are the first registration rollers 4a and 4b, the second registration rollers 5, and the lead roller 6 on the opposite side thereof. . A scraper 18 as a contact member (first and second contact members) is rotated on the first registration roller 4a and the second registration roller 5 corresponding to a driven roller as a driven rotation member of the two conveying roller pairs. The tip is in contact with the direction in the counter direction, and is configured to scrape off dust (foreign matter) adhering to the roller surface.
[0037]
The adhesive sheet 19 as an adhesive member covers and covers the portion of the back surface of the lower 17 of the opening / closing cover (cover member) covering these two driven rollers (4a, 5) as shown in FIG. The dust scraped off by the scraper 18 is confined in the open / close cover (16 (upper cover member) , 17 (lower cover member) ).
[0038]
Specifically, the pressure-sensitive adhesive sheet 19a is formed on the back surface of the lower opening / closing cover 17, the pressure-sensitive adhesive sheet 19b is formed on the side surface of the lower opening / closing cover 17, and the pressure-sensitive adhesive sheet 19c is formed on the rear surface of the opening / closing cover 16 (just above the central roller of the first registration roller 4a). As a result, dust collected from the roller holes under the opening / closing cover 17 due to a shock during the opening / closing operation of the document processing apparatus and the opening / closing operations of the opening / closing covers 16 and 17 falls into the conveying path as the sheet conveying path. Is prevented. Further, the pressure-sensitive adhesive sheet 19 may be provided on the scraper 18.
[0039]
According to the present embodiment, the scraper 18 is brought into contact with the driven rollers (4a, 5) of the pair of conveying rollers and the adhesive sheet 19 is provided in the scraper 18 or in the vicinity of the scraper 18, whereby the driven rollers (4a, 5) are arranged. 5) is always kept clean, and further, dust that has been scraped off by the scraper 18 and accumulated in the cover can be prevented from entering the transport path again by the opening / closing operation of the document processing apparatus 101 and the opening / closing covers 16 and 17. it can.
[0040]
As a result, the amount of dust conveyed to the reading position e of the image reading apparatus 102 is reduced, the occurrence of black streaks is reduced, and the interior of the document processing apparatus is always kept clean with low cost and simple maintenance. Is obtained.
[0041]
Furthermore, since the adhesive sheet 19 has a weak adhesive force on the sticking surface side as the sticking portion and a strong adhesive force on the dust sticking surface side as the foreign matter attaching portion, the adhesive sheet 19 can be easily peeled off, and a serviceman can perform maintenance. The interchangeability when doing is improved.
[0042]
In the present exemplary embodiment, the sheet conveying rotation member that conveys the document to the reading position e of the image reading apparatus 102 has been described. However, the present invention is not limited thereto, and is applicable to a sheet conveying apparatus provided in an image forming apparatus or an image reading apparatus. Therefore, it is possible to reliably remove the foreign matter adhering to the sheet conveying rotation member that conveys the sheet.
[0043]
【The invention's effect】
As described above, according to the present invention, always sheet conveying rotary member can be kept clean, further, it is possible to prevent the foreign matter as in the prior art intrudes into the sheet transport path Therefore, the inside of the apparatus can be kept clean, and it is possible to prevent image quality deterioration and sheet contamination due to foreign matter.
[0044]
Further, the adhesive member has a strong adhesive force and the foreign matter adhering portion Ru deposited foreign matter have a sticking part rather sticking with a small force to the arrangement portion where the adhesive member is provided, by providing a maintenance It is possible to improve exchangeability in
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an image reading apparatus according to an embodiment.
FIG. 2 is a schematic cross-sectional view of the document processing apparatus according to the present embodiment.
FIG. 3 is a schematic side view of an opening / closing cover showing an example of an adhesive sheet according to the present embodiment.
FIG. 4 is a schematic top view below an opening / closing cover showing an example of an adhesive sheet according to the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Loading tray 2 Pickup roller 3a Paper feed roller 3b Friction separation pad 4a First registration roller (upper)
4b First registration roller (bottom)
5 Second registration roller 6 Lead roller 7 Lead roller I
8 Platen glass (small)
9 White plate 10 Jump stand 11 Height reference member 12 Lead roller II
13a Discharge roller (top)
13b Ejection roller (bottom)
14 Output tray 15 Platen glass (large)
16 Opening and closing cover 17 Opening and closing cover lower 18 Scraper 19 Adhesive sheet 20 Reverse path 101 Document processing apparatus 102 Image reading apparatus 103 Exposure apparatus 104 Hinge section A Document stacking section B Document feed section C Document transport section D Document discharge section E Ejection Paper stacking part S1 Ejection sensor

Claims (7)

A first sheet transport rotating member that transports the sheet along the sheet transport path;
A second sheet conveying rotating member that is provided downstream of the first sheet conveying rotating member in the sheet conveying direction and conveys the sheet along the sheet conveying path;
An upper cover member, and a lower cover member disposed with a space with respect to the upper cover member, and an openable and closable cover,
With
From the space between the upper cover member and the lower cover member, a part of the first sheet transport rotating member and a part of the second sheet transport rotating member have holes formed in the lower cover member. A sheet conveyance device in which the first sheet conveyance rotation member and the second sheet conveyance rotation member are arranged so as to protrude into the sheet conveyance path through
The sheet conveying apparatus is
A first abutment member for scraping off foreign matter adhering to the first sheet conveying rotary member in contact with said first sheet conveying rotary member,
A second abutting member that abuts on the second sheet conveying rotating member and scrapes off foreign matter adhering to the second sheet conveying rotating member;
An adhesive member for adhering foreign matter scraped off by the first contact member and the second contact member ;
Equipped with a,
The adhesive member, of the surface facing the space in the lower cover member, characterized that you have provided over between the first sheet conveying rotary member and the second sheet conveying rotary member sheet Conveying device. The adhesive member is
And foreign matter adhesion portion Ru deposited foreign matter has a strong adhesive force,
An affixing part that adheres to the lower cover member provided with the adhesive member with a weak force;
The sheet conveying apparatus according to claim 1, further comprising: The adhesive member is further provided in a region on the upstream side of the first sheet conveying rotation member with respect to the space in the lower cover member facing the space. Or the sheet conveying apparatus of 2. The sheet conveying apparatus according to any one of claims 1 to 3, wherein the adhesive member is further provided on a surface of the upper cover member that faces the space. It said first and second sheet conveying rotary member is adapted to convey the sheet to a predetermined position of the sheet conveying path,
A sheet stacking means the sheet is stacked to be transported by said first and second sheet conveying rotary member,
A sheet discharge stacking means for stacking and discharging the sheet that has been conveyed to the predetermined position by the first and second sheet conveying rotary member,
The sheet conveying apparatus according to any one of claims 1 to 4, further comprising: A sheet conveying device according to claim 5 ;
At least one of an image forming unit that forms an image on a sheet and an image reading unit that reads image information of the sheet;
A sheet processing apparatus comprising: The sheet processing apparatus according to claim 6 , wherein the predetermined position is a reading position where the image reading unit reads image information of a sheet.

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