JP4541167B2 - Automatic document feeder, image reading apparatus, and image forming apparatus - Google Patents

Description

  The present invention relates to an automatic document feeder, an image reading device, and an image forming apparatus. For example, an automatic document feeder, an image reading device, and an image forming device that prevent leakage of noise from a casing of the automatic document feeder. Relates to the device.

  In an automatic document feeder mounted on an image forming apparatus employing an electrophotographic system, when a plurality of documents are stacked on a sheet feeding tray and a sheet feeding operation is started, the documents are fed out by pickup rollers. The paper is separated one by one by a paper feed roller having a conveyance separation function, and then the original is read by an image sensor while being conveyed by several rollers inside the apparatus, and then by a paper discharge roller. Paper is discharged to the paper output tray.

  However, while the document is being transported, high-frequency control sounds such as “Vienna” and several roller driving sounds such as “rattles”, “sur-sur-sur” documents, or between the document and the document. A sliding sound with a guide or the like for guiding the sound is generated, and these sounds leak out of the apparatus through a gap, a vent hole or the like of the automatic document feeder, and cause noise as a noise.

  In order to prevent such noise leakage, the air from the air injection device that blows and separates air on the document and the air of the vacuum feeding device that sucks and conveys the separated document are used as the document stacking amount. The noise generated by the air is resonated by a resonator having a resonance space and a resonance path provided in the automatic document feeder, and the shape of the resonator is adjusted according to the frequency by the adjusting means. In some cases, air noise is reduced (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-50152

  However, in such a conventional automatic document feeder, noise is reduced inside the automatic document feeder by providing a Helmholtz type resonance tube. It is not possible to sufficiently prevent the generated noise from leaking out of the apparatus through the gaps and vents of the automatic document feeder, and there is still room for improvement.

  The present invention has been made to solve such a problem, and an automatic document feeder and an image reading apparatus capable of preventing noise generated in the casing from leaking out of the casing and reducing the environmental load. And an image forming apparatus.

  An automatic document feeder according to the present invention includes a housing, and a document feeding port and a paper ejection port provided in the housing, in the automatic document feeding device that transports a fed document to a reading position and then ejects the document. A conveying member provided in each of the paper supply port and the paper discharge port, a vent provided in the housing, an exterior cover that opens and closes the housing, and a seal that maintains the inside of the housing in an airtight state And the seal member is provided between a gap formed between the transport member and the paper feed port and the paper discharge port, the vent hole, and between the exterior cover and the housing. Composed of things.

  With this configuration, the gap between the paper feed port and the paper discharge port formed in the housing of the automatic document feeder and the transport member, the air holes, and the space between the exterior cover and the housing are sealed by the seal member, thereby Can be maintained in an airtight state, and noise generated in the housing can be prevented from leaking out of the housing, thereby reducing the environmental load.

  The automatic document feeder of the present invention includes a paper feed tray that communicates with the paper feed port and on which a document is placed, a paper discharge tray on which a document discharged from the paper discharge port is placed, The sheet feeding port, the sheet ejection port, the sheet feeding tray, and a cover that covers the sheet ejection tray are included.

  With this configuration, the paper feed port, paper discharge port, paper feed tray, and paper discharge tray are covered with a cover, so that it is possible to further prevent the noise generated inside the case from leaking out of the case and reduce the environmental burden. This can be further reduced.

The automatic document feeder according to the present invention includes a heat exchanging unit that exchanges heat between the inside of the casing and the outside.
With this configuration, even if the inside of the housing becomes hot due to the airtightness of the inside of the housing by the sealing member, and heat is trapped in the housing, the heat can be discharged outside the housing by the heat exchange means. Thus, it is possible to avoid the equipment constituting the automatic document feeder from becoming hot.

The automatic document feeder according to the present invention is constituted by a structure in which at least a part of the casing is made of a heat radiating steel plate.
With this configuration, the heat inside the casing can be efficiently discharged outside the casing, and it is possible to further prevent the equipment constituting the automatic document feeder from becoming hot.

Further, the automatic document feeder of the present invention is configured to have a dehumidifying means.
With this configuration, it is possible to prevent the equipment constituting the automatic document feeder from being damaged due to condensation, and to reduce the adhesion between the documents that have been conditioned when the document is fed so that the documents can be fed multiple times. Can be prevented.

In the automatic document feeder of the present invention, the dehumidifying means is composed of a zeolite filter.
With this configuration, a high dehumidifying effect can be obtained by using a zeolite filter.

Further, the cover of the automatic document feeder of the present invention is configured to be provided independently at the paper feed port and the paper feed tray and the paper discharge port and the paper discharge tray.
With this configuration, it is possible to reduce noise by shielding, and it is possible to independently perform replenishment of the original and take out of the discharged original even during the conveyance of the original, thereby improving the work efficiency by the user. Can do.

In the automatic document feeder of the present invention, the cover is made of a transparent member.
With this configuration, it is possible to check the document feeding state and the sheet discharging state through the cover, so that it is possible to promptly move to the next process operation, etc., and even when a document jam or equipment failure occurs, Can deal with.

The automatic document feeder according to the present invention includes an auxiliary unit that performs an auxiliary operation when the cover is opened and closed.
With this configuration, the user can open and close the cover with little effort.

The automatic document feeder according to the present invention comprises an automatic opening / closing means for automatically opening and closing the cover.
With this configuration, the user can open and close the cover without a load, and the document setting and taking-out performance can be improved.

The automatic document feeder according to the present invention includes an authentication unit that opens the cover after authentication by the authentication unit.
With this configuration, since the cover cannot be opened without authentication, the document can be removed by opening the cover after transporting the document that the third party does not want to see in the cover. Safety can be ensured.

An image reading apparatus according to the present invention includes the above-described automatic document feeder and an image reading unit that reads an original.
With this configuration, the inside of the housing of the automatic document feeder can be maintained in an airtight state, and noise generated in the housing can be prevented from leaking out of the housing, thereby reducing the environmental load.

Further, the image reading apparatus of the present invention is constituted by a seal member provided at a connecting portion with the automatic document feeder.
With this configuration, the airtight state of the connecting portion between the automatic document feeder and the image reading device maintained in an airtight state can be ensured, so that noise generated at the connecting portion between the automatic document feeder and the image reading device is reduced. The environmental load can be reduced by preventing leakage to the outside.

An image forming apparatus according to the present invention includes the above-described image reading apparatus and an image forming unit that forms an image on a recording medium.
With this configuration, the inside of the housing of the automatic document feeder can be maintained in an airtight state, and noise generated in the housing can be prevented from leaking out of the housing, thereby reducing the environmental load.

  As described above, the present invention provides an automatic document feeder, an image reading apparatus, and an image forming apparatus that can reduce the environmental load by preventing noise generated in the casing from leaking out of the casing. be able to.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 are diagrams showing a first embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention. The present invention can be applied to a scanner device, a facsimile device, or the like as an image reading device, and can be applied to a copying machine, a laser printer, a multifunction printer, an inkjet printer, a printing machine, or the like as an image forming device. In the present embodiment, a copying machine will be described as an example of the image forming apparatus.

  First, the configuration will be described. 1 and 2, a contact glass 2 is provided on the upper surface of the main body 1 a of the copying machine 1, and a slit glass 3 having a smaller area than the contact glass 2 is provided on the upper surface of the main body 1 a adjacent to the contact glass 2. Is provided.

  Further, an ADF 4 as an automatic document feeder is provided on the upper portion of the main body 1a. The ADF 4 can be freely opened and closed to open and close the contact glass 2 and the slit glass 3 via a hinge mechanism (not shown). Yes.

  Below the contact glass 2 and the slit glass 3, an exposure lamp 29a as a scanning optical system constituting an image reading means, mirrors 29b to 29d, a lens 29e, and an image sensor 29f such as a CCD are provided. The image reading device and the ADF 4 constitute an image reading device, and the image reading device constitutes a scanner device.

  The exposure lamp 29 a and the mirrors 29 b to 29 d move in the left-right direction in FIG. 1 below the contact glass 2 when reading the document placed on the contact glass 2, and on the slit glass 3. When reading an original, it stops at the lower side of the slit glass 3, and image information read by the exposure lamp 29a is reflected by the mirrors 29b, 29c and 29d and then condensed by the lens 29e. The image is formed on the image sensor 29f. The image information read by the image sensor 29f is subjected to photoelectric conversion, and then subjected to image processing by an image processing unit (not shown) and is output on a photosensitive drum described later.

  A paper feed tray 5 is provided above the ADF 4, and a document bundle P <b> 1 made up of a plurality of documents is placed on the paper feed tray 5. The document bundle P1 placed on the sheet feed tray 5 is fed by a pickup roller 6 that can be brought into contact with and separated from the document bundle P1, and then the paper feed belt 7 rotates in the clockwise direction and the clockwise direction. The uppermost original is separated by a reverse roller 8 that rotates in the reverse direction.

  The document separated by the paper feed belt 7 and the reverse roller 8 is reversed along the reversing path 10 by the conveyance drive roller pair 9, and then on the slit glass 3 while being synchronized with the document reading speed by the registration roller pair 11. It is designed to be conveyed.

At this time, the document that has been read is carried out from the slit glass 3 by the conveying roller 12, and in the case of a double-sided document, it is provided on the document reading surface side opposite to the reading surface of the exposure lamp 29a. The document is read by the image sensor 30 that is provided.
The image information read by the image sensor 30 is subjected to photoelectric conversion, and then subjected to image processing by an image processing unit (not shown) and is output on a photosensitive drum described later.

  The document that has been read is discharged onto a discharge tray 14 by a discharge roller pair 13. The paper discharge tray 14 is provided below the paper feed tray 5, and the ADF 4 is reduced in size by configuring the paper feed tray 5 and the paper discharge tray 14 in a two-layer structure.

  In the present embodiment, the pickup roller 6, paper feed belt 7, reverse roller 8, transport roller pair 9, registration roller pair 11, transport roller 12, and paper discharge roller pair 13 described above are within the main body (housing) 4 a of the ADF 4. Is provided. Further, the paper feed tray 5 projects from the main body 4a, and the paper discharge tray 14 is constituted by a part of the main body 4a.

  On the other hand, a photoconductor drum 15, a developing device 16, a charger 17, a cleaning unit 18, a transfer unit 19, and a fixing device 20 constituting an image forming unit are provided in the main body 1 a of the copying machine 1.

  The charger 17 charges the surface of the photosensitive drum 15, and an electrostatic latent image is formed on the photosensitive drum 15 by a writing unit 21 that writes image data.

  The developing device 16 attaches toner to the electrostatic latent image on the photosensitive drum 15 to form a visible image, and this toner image is transferred to a recording sheet. Specifically, a plurality of recording paper cassettes 22a to 22e are provided below the photosensitive drum 15, and the recording paper stored in the recording paper cassettes 22a to 22e is guided to the roller pairs 23a to 23e. By this, it is transported along the transport path.

  The recording paper is synchronized with the formation of the toner image by the registration roller pair 24 and then conveyed between the photosensitive drum 15 and the transfer unit 19. The transfer unit 19 is configured to transfer the toner image on the photosensitive drum 15 onto a recording sheet, and the cleaning unit 18 removes unnecessary toner adhering to the photosensitive drum 15 from the photosensitive drum 15. The fixing device 20 includes a heating roller 20a and a pressure roller 20b, and is configured to press and fix the toner image on the recording paper onto which the toner image has been transferred.

  The main body 4a of the ADF 4 is provided with a paper feeding port 25 and a paper ejection port 26. The paper feeding port 25 and the paper ejection port 26 have a pickup roller (conveying member) 6 and a pair of paper ejection rollers (conveyance), respectively. Member) 13 is provided.

  Further, a seal member 27 is provided in the gap between the paper feed port 25 and the pickup roller 6, and the gap between the paper feed port 25 and the pickup roller 6 is sealed by the seal member 27 (FIG. 3 ( a)).

  A seal member 28 is provided in the gap between the paper discharge port 26 and the paper discharge roller pair 13, and the gap between the paper discharge port 26 and the paper discharge roller pair 13 is sealed by the seal member 28. (See FIG. 3B).

  As the sealing members 27 and 28, it is possible to use a wide range of materials such as resin products such as rubber and urethane and materials with high specific gravity such as a sound insulating material, and these composite materials may be used.

  Although not shown, a seal member is also provided in a vent hole provided in the main body 4a in addition to the paper feed port 25 and the paper discharge port 26, and this vent hole is also sealed by the seal member.

  The main body 4a is provided with an exterior cover (not shown). The outer cover is openable and closable with respect to the main body 4a. When an original jam occurs on the conveyance path, the outer cover is opened. The jam original can be removed. Further, a seal member is provided on a ridge line or a contact surface where the exterior cover and the main body 4a come into contact, and when the main body 4a is closed by the outer cover, the seal member seals between the main body 4a and the outer cover. .

  In the present embodiment, when the feeding operation of the original bundle P1 on the paper supply tray 5 is started, the original bundle P is sent out by the pickup roller 6, and is fed from the original bundle P1 by the paper supply belt 7 and the reverse roller 8. After the upper document is separated, it is conveyed toward the slit glass 3 while being reversed on the reverse path 10 by the conveying roller pair 9 and the registration roller pair 11.

  Next, one surface of the original is irradiated with light by an exposure lamp 29a stopped below the slit glass 3, and the light reflected from the original is reflected by mirrors 29b, 29c, and 29d. Thereafter, the light is condensed by the lens 29e and formed on the image sensor 29f, and the image information read by the image sensor 29f is photoelectrically converted, and then subjected to image processing by the image processing unit. Is output.

  In the case of a double-sided document, the other side of the document is read by the image sensor 30, and image information read by the image sensor 30 is photoelectrically converted and then subjected to image processing by an image processing unit, and the photosensitive drum 15. Output above. Next, the document that has been read is discharged onto the discharge tray 14 by the conveying roller 12 and the discharge roller pair 13.

  On the other hand, during the conveyance of the document, a high-frequency control sound “Vienna” in the main body 4a, driving sounds of several rollers such as the discharge roller pair 13 such as “rattle”, documents between “sur-sur-sur”, A sliding sound is generated between the document and the reverse path 10.

  In the present embodiment, a seal member 27 is provided in the gap between the paper feed port 25 and the pickup roller 6, and a seal member 28 is provided in the gap between the paper discharge port 26 and the paper discharge roller pair 13. In addition, since the sealing member is provided between the ventilation hole and the exterior cover provided in the main body 4a and the main body 4a, the inside of the main body 4a can be sealed by the sealing member, and is generated in the main body 4a. It is possible to prevent the noise from leaking out of the main body 4a and reduce the environmental load.

  FIG. 4 is a diagram showing a second embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention. The same reference numerals are given to the same components as those in the first embodiment. Description is omitted.

  In FIG. 4, a cover 31 is provided on the main body 4a of the ADF 4, and this cover 31 is rotated about a rotation shaft 32 provided on the right side of the main body 4a, whereby the paper feed tray 5 and the discharge tray 5 are discharged. The paper tray 14, the paper feed port 25, and the paper discharge port 26 are covered.

  In this embodiment, the cover 31 is opened when a document to be read is placed on the paper feed tray 5 or when a document that has been read is taken out from the paper discharge tray 14, and the cover 31 is closed during reading. .

  In this way, since the main body 4a of the ADF 4 is sealed, it is possible to prevent noise in the ADF 4 from leaking, and in addition, the ADF 4 is positioned at the uppermost position that is conveyed by the pickup roller 6 during paper feeding. The noise when the document slides with the document under it and the noise when the document discharged by the discharge roller pair 13 slides with the document already loaded on the discharge tray 14 are blocked. These noises can be prevented from leaking outside the main body 4a.

  In this embodiment, the cover 31 opens and closes around the rotation shaft 32. However, the present invention is not limited to this. For example, the cover 31 may be configured to be completely removed from the main body 4a. A structure in which a part of 31 opens and closes may be used.

  Moreover, you may comprise the cover 31 from a transparent member. In this way, it is possible to check the document feeding state and the sheet discharging state through the cover 31, so that it is possible to promptly move to the next process and the like, and a document jam or equipment failure has occurred. Even if it can be dealt with promptly.

  Moreover, in this Embodiment, you may provide the auxiliary | assistant means which performs auxiliary | assistant operation | movement when opening and closing the cover 31. FIG. As this auxiliary means, a spring that biases the cover 31 in the direction to open the cover 31 is provided in the vicinity of the rotating shaft 32 to assist the operation when the cover 31 is opened, or the cover 31 is disposed in the vicinity of the rotating shaft 32. You may make it provide the damper (shock absorber) which assists the operation | movement when opening. In this way, the user can open and close the cover 31 when opening and closing the cover 31 with little effort.

  Further, an automatic opening / closing means for automatically opening / closing the cover 31 may be provided. The automatic opening / closing means may be constituted by, for example, a switch and a motor and a speed reducer that are operated by operating the switch. In this way, the user can open and close the cover 31 without any load, and the document setting and taking-out performance can be improved.

  Further, authentication means for authenticating physical features such as ID authentication and fingerprints and irises may be provided, and the cover 31 may be opened after authentication by the authentication means. In this way, since the cover 31 cannot be opened unless authentication is performed, the cover 31 is opened after the document that is not desired to be seen by a third party is transported in the cover 31 and the document is taken out. And the safety of the document can be ensured.

  FIG. 5 is a diagram showing a third embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention. The same reference numerals are given to the same components as those in the second embodiment. Description is omitted.

  In FIG. 5, a cover 41 is provided on the main body 4a of the ADF 4, and this cover 41 is rotated about a rotation shaft 42 provided on the right side of the main body 4a, so that the paper discharge tray 14 and the discharge tray 14 are discharged. The paper mouth 26 is covered.

  Further, the main body 4a of the ADF 4 is provided with a cover 43. The cover 43 is rotated about a rotation shaft 44 provided on the left side of the main body 4a, whereby the paper feed tray 5 and the paper feed opening are provided. 25 is covered.

  In the present embodiment, the paper feed tray 5, the paper discharge tray 14, the paper feed port 25, and the paper discharge port 26 can be covered by the covers 41 and 43. Therefore, as in the second embodiment, noise reduction is achieved by shielding. In addition, the cover 41, 43 can be opened separately to replenish the original and take out the ejected original independently even while the original is being transported. Efficiency can be improved.

  FIG. 6 is a diagram showing a fourth embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention. The same reference numerals are given to the same components as those in the second embodiment. Description is omitted.

  In FIG. 6, a heat radiating fin 51 is provided at the right end of the main body 4 a, and one end of a heat pipe 52 is attached to the heat radiating fin 51. The other end of the heat pipe 52 is attached to a plate 53, and the plate 53 is provided on the lower surface of the paper discharge tray 14. The radiating fins 51, the heat pipes 52, and the plates 53 constitute heat exchange means.

  In the present embodiment, in addition to the effects of the second embodiment, the high-temperature exposure lamp 29a and the image sensor 30 read the document while it is being conveyed, and various rollers such as the conveyance roller pair 9 and the like are reversed. Even if the original document discharged onto the paper output tray 14 may be curled due to contact with the path 10 or the like, the heat of the original may be radiated from the plate 53 via the heat pipe 52. By moving to 51, the heat is released from the heat radiating fins 51 to the outside air, so that it is possible to avoid the occurrence of the curl due to a decrease in the temperature of the document.

  In the present embodiment, the exterior of the automatic document feeder may be a heat radiating steel plate and connected to the heat pipe 52. In this way, a heat sink having a large heat radiation area and a high heat transfer coefficient can be formed, and the temperature of the original can be efficiently lowered.

  In this embodiment, the heat pipe 52 is used as the heat exchanging means, but other methods may be used. For example, although it is the same heat pipe, you may achieve the heat exchange means which raised the freedom degree of the installation direction by utilizing a self-excited heat pipe. If the liquid cooling method is adopted, the heat capacity can be increased, and a high heat transport amount can be achieved by increasing the flow velocity, thereby efficiently reducing the temperature of the original.

  The plate 53 is preferably made of a material having high thermal conductivity. For example, aluminum itself has good thermal conductivity, but if it can be made of copper, twice as high thermal conductivity can be expected, and a rapid temperature decrease can be expected.

  In the present embodiment, the plate 53 is provided on the lower surface of the paper discharge tray 14 so as to lower the temperature of the document. However, the present invention is not limited to this. 30) or the like may be provided to perform heat exchange. In this way, it is possible to prevent the device from becoming hot.

  FIG. 7 is a diagram showing a fifth embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention. The same reference numerals are given to the same components as those in the second embodiment. Description is omitted.

  In FIG. 7, a maintenance-free zeolite filter 61 as a dehumidifying means is provided inside the cover 31. In the present embodiment, the ambient humidity in the cover 31 can be reduced by the zeolite filter 61, and it is possible to prevent the originals from being brought into close contact with each other due to high humidity during paper feeding. The installation position of the zeolite filter 61 is not limited to the inside of the cover 31 but may be the main body 4a.

  FIG. 8 is a diagram showing a sixth embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention. The same reference numerals are given to the same components as those in the second embodiment. Description is omitted.

  In FIG. 6, the ADF 4 is openable and closable with respect to the upper part of the main body 1a of the copying machine 1, and a seal member 71 is provided between the ADF 4 and the upper part of the main body 1a, that is, at the connecting portion between the ADF 4 and the main body 1a. It has been. For this reason, when the ADF 4 closes the upper part of the main body 1 a, the ADF 4 and the upper part of the main body 1 a are sealed by the seal member 71.

  For this reason, in this embodiment, in addition to noise leakage due to sealing of the ADF 4, it is possible to prevent noise from leaking to the outside at the connecting portion between the ADF 4 and the copying machine 1, thereby reducing the environmental load.

  As described above, the automatic document feeder, the image reading apparatus, and the image forming apparatus according to the present invention can reduce the environmental load by preventing the noise generated inside the casing from leaking out of the casing. And is useful as an automatic document conveyance device, an image reading device, an image forming device, and the like that prevent leakage of noise from the casing of the automatic document conveyance device.

1 is a diagram illustrating a first embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention, and is a schematic configuration diagram of a copying machine as an image forming apparatus. 1 is a schematic configuration diagram of an automatic document feeder according to a first embodiment. (A) is an A direction arrow view of FIG. 2, (b) is a B direction arrow view of FIG. FIG. 3 is a diagram illustrating a second embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention, and is a schematic configuration diagram of a copying machine as an image forming apparatus. FIG. 4 is a diagram showing a third embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention, and is a schematic configuration diagram of a copying machine as an image forming apparatus. FIG. 10 is a diagram illustrating a fourth embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention, and is a schematic configuration diagram of a copying machine as an image forming apparatus. FIG. 10 is a diagram illustrating a fifth embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention, and is a schematic configuration diagram of a copying machine as an image forming apparatus. FIG. 10 is a diagram illustrating a sixth embodiment of an automatic document feeder, an image reading apparatus, and an image forming apparatus according to the present invention, and is a schematic configuration diagram of a copying machine as an image forming apparatus.

Explanation of symbols

1 Copying machine (image forming device)
4 ADF
4a Body (housing)
5 Paper feed tray 6 Pickup roller (conveying member)
13 Paper discharge roller pair (conveying member)
15 Photosensitive drum (image forming means)
16 Developer (image forming means)
17 Charger (image forming means)
18 Cleaning unit (image forming means)
19 Transfer section (image forming means)
DESCRIPTION OF SYMBOLS 20 Fixing device 25 Paper feed port 26 Paper discharge port 27, 28 Seal member 29a Exposure lamp (image reading means)
29b to 29d mirror (image reading means)
29e lens (image reading means)
29f Image sensor (image reading means)
31, 41, 43 Cover 51 Radiation fin (heat exchange means)
52 Heat pipe (heat exchange means)
53 Plate (Heat exchange means)
61 Zeolite filter

Claims (1)

An automatic document feeder that transports a fed document to a reading position and then ejects the document .
A housing,
A document feeding port and a document ejection port provided in the housing;
A transport member provided at each of the paper feed port and the paper discharge port ;
And the outer cover for opening and closing the front Kikatamitai,
A seal member for maintaining the inside of the housing in an airtight state,
The seal member includes a gap formed between the conveying member and the sheet feed port and discharge port, in the automatic document feeder provided with between the front and Kigaiso cover the housing,
A paper feed tray that communicates with the paper feed slot and on which documents are placed;
A paper discharge tray on which documents discharged from the paper discharge port are placed;
A cover that covers the paper feed port, the paper discharge port, the paper feed tray, and the paper discharge tray;
The automatic document feeder according to claim 1, wherein the cover is provided independently at the paper feed port and the paper feed tray and at the paper discharge port and the paper discharge tray .

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