WO2005029197A1 - 画像形成装置 - Google Patents
画像形成装置 Download PDFInfo
- Publication number
- WO2005029197A1 WO2005029197A1 PCT/JP2004/013685 JP2004013685W WO2005029197A1 WO 2005029197 A1 WO2005029197 A1 WO 2005029197A1 JP 2004013685 W JP2004013685 W JP 2004013685W WO 2005029197 A1 WO2005029197 A1 WO 2005029197A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- image
- sheet feeding
- image forming
- paper
- forming apparatus
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6502—Supplying of sheet copy material; Cassettes therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
- G03G15/1615—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support relating to the driving mechanism for the intermediate support, e.g. gears, couplings, belt tensioning
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
Definitions
- the present invention relates to an image forming apparatus in which a sheet feeding opening for conveying a recording medium is provided in an apparatus main body.
- various image forming apparatuses such as electrophotographic copying machines and printers are provided with a sheet feeding device such as a sheet feeding cassette capable of stacking a large number of recording media, and the sheet feeding
- the recording medium delivered from the apparatus is transported through the paper feeding transport path, and is transported to a transfer area of an image carrier such as a photosensitive drum on which an electrostatic latent image is formed.
- a sheet feeding opening in the main body of the apparatus is especially intended to feed a special recording medium such as a thick sheet other than a normal recording sheet, a postcard, an envelope or the like.
- An opening may be provided.
- the sheet feeding opening is provided supplementary to the main sheet feeding device or separately provided, but is fed into the apparatus main body through the sheet conveyance path of the sheet feeding opening.
- the recording medium is fed into the sheet feeding and conveying path and conveyed to the above-described transfer area! It's getting worse!
- the path leading to such a paper feed opening force image carrier is often formed in a simple, substantially linear shape, and is a disturbance that has entered into the inside of the paper feed opening camber.
- Light may be reflected on the surface of the paper transport path and reach the image carrier. Then, the surface of the image carrier is irradiated with the reflected light, so that the potential of the original latent image written on the image carrier or the area around it changes, and as a result, the image area Unwanted toner may adhere to the surrounding area, which may significantly deteriorate the image quality.
- a separate member such as a light shielding sheet for shielding the light reflected from the surface of the paper conveyance path extending from the paper feed opening with respect to the image carrier is disposed.
- the present invention has been made possible to satisfactorily block the image carrier of the reflected light of disturbance light incident from the sheet feeding opening with a simple configuration, and to obtain a high quality image. It aims to provide an image forming device.
- a sheet feeding opening for feeding a recording medium toward a transfer area of an image carrier on which an electrostatic latent image is formed In an image forming apparatus provided in an apparatus main body, a paper conveying road surface force from the sheet feeding opening to the transfer area
- the disturbance light which has entered the inside of the apparatus main body through the sheet feeding opening is It is formed by an inclined surface that is set at an angle to reflect light in a direction other than the image carrier! Scold.
- the image forming apparatus of the first aspect of the present invention having such a configuration, even if disturbance light enters the inside of the apparatus from the sheet feeding opening, it extends from the sheet feeding opening.
- the light reflected from the surface of the paper conveyance path consisting of the inclined surface avoids the image carrier and travels in a direction other than the image carrier, and as a result, the potential of the latent image or the surrounding area may be changed.
- the high quality image can be obtained easily and reliably.
- the inclined surface forming the paper transport surface in claim 1 is constituted by a flat surface or a plurality of uneven surface forces.
- the configuration of the paper conveyance surface itself extending from the paper feed opening portion can be appropriately formed.
- an image on which an electrostatic latent image is formed In an image forming apparatus provided with a paper feed opening portion for feeding a recording medium toward a transfer area of a carrier in an apparatus main body, a paper conveyance path from the paper feed opening portion to the transfer area has a paper conveyance direction And the sheet feed opening portion in a portion between the thin plate-like partition plates adjacent to each other in the arrangement direction.
- a light shielding plate is provided to shield the image carrier from disturbance light that has entered the inside of the force device.
- disturbance light enters the inside of the apparatus from the sheet feeding opening, and the sheet extending from the sheet feeding opening Most of the disturbance light is shielded by the light shielding plate formed between the plurality of thin plate-like partition plates constituting the transport path, and a small area of the area formed by the edge of the thin plate-like partition plate Only light reflected by the paper conveyance surface is irradiated to the image carrier. Therefore, the light quantity of the reflected light irradiated to the image carrier is greatly reduced as compared with the conventional case, and the disturbance by the disturbance light to the latent image written on the image carrier is well prevented. At the same time, it is possible to reduce the sliding resistance of the recording medium in the paper conveyance path or the stress at the leading end of the paper by the thin plate-like partition plate, and a high quality image can be obtained. Effect of the invention
- the sheet feeding opening for feeding the recording medium fed from the outside through the sheet feeding opening provided in the apparatus main body to the transfer area Since the paper conveyance surface from the sheet to the transfer area is formed by an inclined surface that reflects the disturbance light entering from the sheet feeding opening in a direction other than the direction toward the image carrier, Since the disturbance caused by the disturbance light with respect to the latent image written on the body is eliminated to obtain a good image, a high quality image can be obtained with a simple configuration. The reliability can be greatly improved at low cost.
- the inclined surface forming the paper conveyance surface in claim 1 is configured as a flat surface or a plurality of uneven surface forces, so Since a good image is obtained by a simple structure in which the surface configuration of the extending paper conveyance path is appropriately formed, it is possible to improve the productivity of the apparatus by taking advantage of the effects described above. it can.
- the recording medium fed from the outside is transferred to the transfer area through the paper supply opening provided in the apparatus main body.
- the sheet conveyance path up to the area is constituted by a plurality of thin plate-like partition plates arranged at appropriate intervals in a direction perpendicular to the sheet conveyance direction, and between the adjacent thin plate-like partition plates.
- image information sent from an external computer is converted as light modulation information 111 by the laser light emission writing unit 11 via a video controller (not shown).
- An image is formed in a spot shape on a photosensitive drum 121 as an image carrier provided in the process cartridge 12, and the light spot is reciprocally scanned in the axial direction (main scanning direction) of the photosensitive drum 121.
- an electrostatic latent image corresponding to the formed image is formed on the photosensitive drum 121.
- a developer (toner) is supplied to the electrostatic latent image on the photosensitive drum 121 from the developing device 122 which is also integrally provided in the process cartridge 12 to form an unfixed toner image.
- a sheet feeding cassette 13 constituting a main sheet feeding unit is disposed on the lower side of the apparatus.
- recording sheets (recording media) P of a desired size are stored in a stacked manner. Then, the recording sheet P in the sheet feeding cassette 13 is pulled out by the rotation of the sheet feeding roller 131 and is fed into the sheet feeding conveyance path 132 reaching the transfer area facing the photosensitive drum 121 described above. The sheet is conveyed toward the transfer area while being appropriately timed by registration rollers 14 provided in a sheet feeding and conveying path 132. Ru.
- a transfer roller 15 as a contact transfer member is disposed in contact with the surface of the photosensitive drum 121 so as to be in contact with the surface of the photosensitive drum 121.
- a transfer bias is applied to the transfer roller 15, and the non-fixed toner image on the photosensitive drum 121 is electrostatically transferred onto the recording paper P by the transfer bias. Furthermore, toner remaining on the photosensitive drum 121 after transfer is removed by the sliding contact force of the cleaning blade 123 disposed to be in pressure contact with the surface of the photosensitive drum 121.
- the fixing device 16 is provided with a fixing roller 161 and a pressure roller 162 as a heater.
- the unfixed toner on the recording paper P is obtained by the heat fixing operation of the fixing roller 161 and the pressure roller 162. It is heated and melted, as a result, the toner image is fixed and fixed on the recording paper P! /.
- the recording sheet P on which the toner image is fixed by such a heating and fixing operation is discharged onto the discharge tray 18 by the discharge roller 171 of the discharge roller 17 provided on the upper side of the apparatus main body in the drawing. It has become.
- the paper discharge tray 18 holds the recording paper P discharged after fixing in a stacked manner, and the paper feeding direction (rightward in FIG. 1) from the position directly below the paper discharge tray 17 of the apparatus main body portion.
- the fixed paper discharge tray 181 is provided so as to extend obliquely upward using a part of the cover of the apparatus main body, and the front end portion of the fixed paper discharge tray 181 in the paper feeding direction.
- the movable sheet discharge tray 182 is continuously provided so as to be rotatable about the support pins.
- the movable sheet discharge tray 182 is configured to be opened and closed between an open use position shown and a storage closing position (not shown).
- the upper space 181 is open and closed.
- the sheet feeding cassette 13 as the above-mentioned main sheet feeding device also has an auxiliary sheet feeding position in the middle of the sheet feeding conveyance path 132 until the transfer area is reached.
- the paper conveyance path 201 of the apparatus 20 is connected.
- the paper conveyance path 201 of the auxiliary sheet feeding device 20 is provided in a portion between the upper conveyance plate 201a formed by using the apparatus main body cover and the lower conveyance plate 201b.
- the registration roller 14 is provided in the sheet feeding and conveying path 132 described above and extends inward from the sheet feeding opening 202 provided to open on the surface side of the apparatus main body. Formed so as to merge in the front part of the paper feeding direction of.
- the sheet conveyance surface of the lower conveyance plate 201b constituting the bottom surface of the sheet conveyance path 201 is relatively steep from the above-described sheet feeding opening 202 toward the inside of the apparatus (left side in FIG. 2). It is formed by an inclined surface that descends at an angle.
- the inclination angle of the inclined surface forming the lower conveying plate 20 lb is set to be an angle for directing the disturbance light entering from the sheet feeding opening 202 to the members other than the photosensitive drum 121 and reflecting it.
- the reflected light B of the disturbance light A on the lower carrier plate 201 b is reflected in the direction downward from the photosensitive drum 121 in the drawing.
- the normal at one arbitrary point P on the conveyance surface of the lower conveyance plate 201 b in the paper conveyance path 201 is M
- the arbitrary point K at the opening edge of the sheet feeding opening 202 is K
- a straight line (disturbance light) A that passes through to reach point P on the lower transfer plate 201b be a straight line connecting the point P on the lower transfer plate 201b and any point b on the surface of the photosensitive drum 121
- straight line (reflected light) B the relationship between the angles ⁇ A and ⁇ B formed between the straight line A and the straight line B and the normal line M is
- the actual reflected light B ′ reflected on the surface of the paper conveyance path 201 is configured to travel downward from the photosensitive drum 121 !.
- the sheet conveyance path 201 extending from the sheet feeding opening 202 is obtained.
- the reflected light B ′ reflected by the surface of the light travels avoiding the photosensitive drum 121 which is not directed to the photosensitive drum 121 like the reflected light B in the conventional device.
- the potential of the latent image on the photosensitive drum 121 or the area around it does not change, and a high quality image can be obtained easily and reliably.
- disturbance light A force entering from the sheet feeding opening portion 202 is configured to be not reflected by being reflected in the lower direction of the drawing, but the photosensitive drum 121 is not irradiated.
- the disturbance light A which has entered from the paper opening 202 is reflected in the upper direction in the drawing.
- the same action and effect can be obtained by adopting a configuration, that is, a configuration in which ⁇ ⁇ .
- the lower carrying plate 201c which forms the bottom of the paper conveyance path 201 from the opening 202 to the paper feeding conveyance path 132, travels the disturbance light A intruding from the paper feeding opening 202 (the left direction in the drawing).
- the sawtoothed triangular wave is formed from a continuum of concave and convex inclined surfaces.
- the inclined surface on the front side facing the traveling direction of the disturbance light A among the inclined surfaces of the lower carrier plate 201c having the sawtooth-like triangular wave shape reflects the reflected light B 'from the front inclined surface.
- the inclined surface on the rear side in the traveling direction of the disturbance light A removes the reflected light from the inclined surface on the rear side to the lower side of the photosensitive drum 121. It is set to make an inclination angle! Also in the second embodiment having such a configuration, the same operation and effect as the first embodiment described above can be obtained.
- the sheet is fed from the sheet feeding opening 202 of the auxiliary sheet feeding device 20.
- the lower conveying plate 201d which forms the bottom of the paper conveyance path 201 leading to the conveyance path 132, is stepped toward the traveling direction (left direction in the drawing) of the disturbance light A intruding from the sheet feeding opening 202. It extends in the form of a step that descends into a shape.
- the inclined surface corresponding to the front side in the traveling direction of the disturbance light A is formed as a surface that contributes to the reflection of the disturbance light A.
- the angle setting is made along the line extending radially, with the convergence point O force appropriately set such that the inclined surface to be contributed is the surface for removing the reflected light B to the upper side of the photosensitive drum 121. Also in the third embodiment having such a configuration, the same function and effect as those of the above-described first embodiment can be obtained.
- the lower side of the paper conveyance path 201 is composed of a plurality of thin plate-like partition plates arranged along the direction orthogonal to the paper transport direction. There is.
- the lower conveying plate 201e formed of the thin plate-like partition plate is configured to be erected on the back side of a main frame 132a which is a curved plate force forming a part of the sheet feeding conveying path 132 reaching the above-described transfer region. .
- a large number of thin plate-like partition plates 201e are attached to the main body frame 132a so as to form a rib shape with an appropriate interval in a direction orthogonal to the paper conveyance direction.
- a main body frame 132a corresponding to between the partition plates 201e is configured to form a light shielding plate for shielding the disturbance light A entering from the sheet feeding opening portion 202 with respect to the photosensitive drum 121.
- the conveyance path is required to be guided while stress is not applied to the leading end of the recording medium in the conveyance direction.
- Ru it is desirable that the upper surface shape of the lower carrier plate 201e described above is formed in a straight line or a gently curved shape, but the upper end face for guiding the recording medium of the thin plate partition plate 201e in this embodiment is It is formed to be linear.
- a plurality of thin plate-like partition plates are provided behind the sheet feeding opening 202. Since the paper transport path consisting of 201e is provided, most of the disturbance light A is shielded by the light shield plate 132a formed between the thin plate-like partition plates 201e, and the thin plate-like partition plate 201e Reflected light B from a small area formed by the upper edge is only irradiated to the photosensitive drum 121. Therefore, the light amount of the reflected light B irradiated to the photosensitive drum 121 is significantly reduced as compared with the conventional case, and the latent image written on the photosensitive drum 121 and the area around it are reduced.
- the disturbance due to the disturbance light A to the above is significantly reduced. Further, by constituting the lower conveying plate by the thin plate-like partition plate 201e, the sliding resistance of the recording paper P is reduced, and in particular, by forming the linear lower conveying plate, the stress on the leading edge of the recording paper P is stressed. It is possible to reduce the image quality and obtain extremely high quality images.
- the present invention is not limited to the above embodiment and can be variously modified without departing from the gist of the invention. Needless to say.
- the present invention can be similarly applied to other image forming apparatuses such as a force copying machine to which the present invention is applied to a printer.
- the sheet feeding opening portion is provided as an auxiliary sheet feeding device for the main sheet feeding device, but the sheet feeding opening is not provided as a plurality of sheet feeding devices but as a single sheet feeding device. It is also possible to configure to provide a part.
- the image forming apparatus according to the present invention described above can be widely applied to a wide variety of image forming apparatuses such as copying machines as well as an image forming apparatus such as a printer.
- FIG. 1 is a schematic vertical cross-sectional explanatory view showing the internal structure of a printer according to an embodiment of the present invention.
- FIG. 2 is a schematic vertical cross-sectional explanatory view showing an enlarged structure of an auxiliary sheet feeding device in the printer shown in FIG.
- FIG. 3 is a schematic vertical cross-sectional explanatory view showing the internal structure of a printer as another embodiment of the present invention.
- FIG. 4 is a schematic vertical cross-sectional explanatory view showing an enlarged structure of an auxiliary sheet feeding device in the printer shown in FIG. 3;
- FIG. 5 is a schematic longitudinal sectional view showing the internal structure of a printer according to still another embodiment of the present invention.
- FIG. 6 A schematic longitudinal sectional view showing the internal structure of a printer according to still another embodiment of the present invention.
- FIG. 7 is an external perspective view of an enlarged part of a sheet conveyance path of the auxiliary sheet feeding device shown in FIG. 6;
- FIG. 8 is an explanatory side view of the sheet conveyance path of the auxiliary sheet feeding device shown in FIG. 7;
- Paper cassette main paper feeder
- Lower carrier plate (thin plate partition plate)
- body frame (light shield plate)
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrophotography Configuration And Component (AREA)
- Control Or Security For Electrophotography (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
- Paper Feeding For Electrophotography (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/573,430 US20070274752A1 (en) | 2003-09-24 | 2004-09-17 | Image Forming Apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003332487A JP4396918B2 (ja) | 2003-09-24 | 2003-09-24 | 画像形成装置 |
JP2003-332487 | 2003-09-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005029197A1 true WO2005029197A1 (ja) | 2005-03-31 |
Family
ID=34373094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/013685 WO2005029197A1 (ja) | 2003-09-24 | 2004-09-17 | 画像形成装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070274752A1 (ja) |
JP (1) | JP4396918B2 (ja) |
KR (1) | KR20060125707A (ja) |
CN (1) | CN100385344C (ja) |
WO (1) | WO2005029197A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4995311B2 (ja) | 2010-09-22 | 2012-08-08 | キヤノン株式会社 | 電子写真画像形成装置 |
JP5962273B2 (ja) * | 2012-07-09 | 2016-08-03 | ブラザー工業株式会社 | 画像形成装置 |
JP5920070B2 (ja) | 2012-07-09 | 2016-05-18 | ブラザー工業株式会社 | 画像形成装置 |
JP6848672B2 (ja) * | 2017-05-17 | 2021-03-24 | ブラザー工業株式会社 | 画像形成装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01121036U (ja) * | 1988-02-09 | 1989-08-16 | ||
JPH06222631A (ja) * | 1993-01-27 | 1994-08-12 | Tokyo Electric Co Ltd | 電子写真装置 |
JPH09197746A (ja) * | 1996-01-18 | 1997-07-31 | Canon Inc | 画像形成装置及びプロセスカートリッジ及び記録媒体保管手段 |
JPH09304981A (ja) * | 1996-05-17 | 1997-11-28 | Canon Inc | 画像形成装置 |
JPH11139626A (ja) * | 1997-10-31 | 1999-05-25 | Canon Inc | シート材搬送装置及び画像形成装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001060040A (ja) * | 1999-08-23 | 2001-03-06 | Brother Ind Ltd | 現像装置及びプロセスカートリッジ及び現像器カートリッジ及び画像形成装置 |
JP2002156884A (ja) * | 2000-11-20 | 2002-05-31 | Fuji Xerox Co Ltd | 画像形成装置 |
-
2003
- 2003-09-24 JP JP2003332487A patent/JP4396918B2/ja not_active Expired - Fee Related
-
2004
- 2004-09-17 US US10/573,430 patent/US20070274752A1/en not_active Abandoned
- 2004-09-17 WO PCT/JP2004/013685 patent/WO2005029197A1/ja active Application Filing
- 2004-09-17 CN CNB2004800277502A patent/CN100385344C/zh not_active Expired - Fee Related
- 2004-09-17 KR KR1020067005704A patent/KR20060125707A/ko not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01121036U (ja) * | 1988-02-09 | 1989-08-16 | ||
JPH06222631A (ja) * | 1993-01-27 | 1994-08-12 | Tokyo Electric Co Ltd | 電子写真装置 |
JPH09197746A (ja) * | 1996-01-18 | 1997-07-31 | Canon Inc | 画像形成装置及びプロセスカートリッジ及び記録媒体保管手段 |
JPH09304981A (ja) * | 1996-05-17 | 1997-11-28 | Canon Inc | 画像形成装置 |
JPH11139626A (ja) * | 1997-10-31 | 1999-05-25 | Canon Inc | シート材搬送装置及び画像形成装置 |
Also Published As
Publication number | Publication date |
---|---|
US20070274752A1 (en) | 2007-11-29 |
JP2005099380A (ja) | 2005-04-14 |
CN1856744A (zh) | 2006-11-01 |
KR20060125707A (ko) | 2006-12-06 |
CN100385344C (zh) | 2008-04-30 |
JP4396918B2 (ja) | 2010-01-13 |
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