JP2002354191A - Image reader and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reader and an image forming device that can prevent paper powder or the like caused when an original passes through a slit glass plate from dropping into a device main body while maintaining the removal of the slit glass. SOLUTION: In the image reader adopting a sheet through method provided with the slit glass plate 2 placed above an image read means such as an exposure lamp 4 and a 1st mirror 51, a mount member 41 for mounting on the slit glass plate 2, and a guide 23 that picks up a carried original in the vicinity of the slit glass plate 2, the slit glass plate 2 is provided with an elastic member 61 that is partly projecting from one edge of a lower face of the slit glass plate and mounted in a length direction so as to overlap with the mount member 41. Further, the guide 23 and the slit glass plate 2 are structured removably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image reading apparatus and an image forming apparatus for exposing and scanning a document conveyed to a slit glass at a constant speed to obtain image light.

[0002]

2. Description of the Related Art Conventionally, in an image reading apparatus or an image forming apparatus such as a copier, a facsimile apparatus, a scanner apparatus, etc., when a document bundle including a plurality of documents is placed on a document placing table and a start key is pressed, The originals are separated one by one and conveyed to the slit glass, and the original is read by image reading means stopped below the slit glass,
When the reading is completed, some printers include an automatic document feeder (ADF) that discharges the document to a predetermined discharge position.

In such an automatic document feeder, an original is illuminated by an exposure lamp provided below the slit glass on the image reading apparatus main body side, and the reflected light is transmitted through a first mirror and a lens to a CCD. An image of a document is read by forming an image on an image forming element such as the above. Further, the document from which the image has been read is scooped up from the slit glass by the scooping-up guide member, and is conveyed in the sheet discharging direction.

Here, since there is a slight gap (about 0.2 mm) between the slit glass and the scooping-up guide member, when paper dust is generated from the original by friction with the slit glass, the paper dust is It falls into the image reading apparatus main body through the gap and between the slit glass and the sheet metal member on which the slit glass is placed, and further adheres to an exposure lamp, a first mirror, and the like located below the slit glass. As a result, there is a problem that the image of the document cannot be read normally.

Therefore, a conventional image reading apparatus is shown in FIG.
As shown, a sheet metal mounting for mounting the slit glass 2
The member 41 has a thin elastic shape that refracts toward the slit glass side.
The member 43 is attached, and the thin elastic member 43 is a slit glass.
By contacting the lower surface, the original P ₁Paper powder 44 generated from
Attempts to prevent falling into the image reading device body
(JP-A-9-304844).

Further, the conventional image reading apparatus has a structure in which a dent is provided in the above-mentioned scooping-up guide member to accumulate dust, and a leaf spring is attached to a mating member to make contact with the slit glass. There has been an attempt to eliminate a gap for dust to fall (Japanese Patent Laid-Open No. 09-171274).

[0007]

According to the technique disclosed in Japanese Patent Application Laid-Open No. 9-304844, paper dust generated when an original document passes through a slit glass during image reading is deposited in the image reading apparatus main body. It is possible to prevent the image reading device, the back surface of the slit glass, the exposure lamp and the first mirror from being stained by dropping, and to read the image of the document normally. However, in the technology disclosed in Japanese Patent Application Laid-Open No. 9-304844, a thin elastic member for preventing paper dust generated when a document passes through the slit glass is provided on the sheet metal member side on which the slit glass is mounted. When the slit glass is removed at the time of maintenance or the like, when the slit glass is removed, paper dust adhering to the edge of the slit glass or paper dust deposited on the thin elastic member may be read by wind pressure or air current generated during work. There is a risk of falling into the device body. For this reason, there is a need for measures to more reliably prevent the foreign matter such as the paper dust from falling.

In the technique disclosed in Japanese Patent Application Laid-Open No. 09-171274, the gap between the slit glass and the scooping-up guide member is not eliminated, so that it is difficult to completely prevent dust from falling. Further, in a configuration in which a leaf spring is attached to a mating member and comes into contact with the slit glass, it is difficult to eliminate a slight gap due to a variation in component accuracy.

SUMMARY OF THE INVENTION It is an object of the present invention to improve such a problem and to prevent paper dust and the like generated when a document passes through the slit glass from falling into the apparatus body while maintaining the detachability of the slit glass. It is an object of the present invention to provide an image reading apparatus and an image forming apparatus capable of preventing the image reading.

[0010]

According to a first aspect of the present invention, there is provided an image reading means for stopping an image surface of a document being conveyed and reading the image, and a mounting means for mounting a slit glass above the image reading means. A member, a slit glass placed so as to cover the entire periphery of the opening of the placing member, and a guide member that is adjacent to the slit glass and scoops up a conveyed document, and the slit glass has Having a resilient member mounted in the longitudinal direction so as to partially protrude from one edge of the lower surface of the slit glass and overlap the placing member, while the resilient member is in close contact with the lower end of the guide member, It is characterized in that it is interposed between the placing member and the guide member.

In a sheet-through type image reading apparatus that reads while moving an original, the original conveyed while being in close contact with the slit glass is scooped from a position slightly lower than the slit glass surface. The sheet is discharged along a stepped guide member. Therefore, the guide member cannot be overlapped on the upper side of the slit glass, and a slight gap is formed between the slit glass and the guide member.Dust such as paper powder falls into the optical system from the gap, and (1) Dirt may adhere to the mirror or the like and adversely affect the image. Therefore, the elastic member (seal member) attached to the lower surface of the slit glass is partially protruded downstream (in the scooping guide side) in the document conveying direction,
By overlapping with a guide member disposed downstream of the document conveying direction with respect to the slit glass, the elastic member serves as a tray, and stores dust such as paper powder falling from a gap between the slit glass and the scooping guide. This prevents the dust from moving under the guide member and dropping into the optical system below the slit glass.

According to a second aspect of the present invention, in the first aspect, another elastic member different from the elastic member is attached to a non-attached end of the elastic member in a longitudinal direction,
It is characterized in that the other elastic member is set to be thicker than the elastic member.

When another elastic member (elastic member seal) is bonded to the elastic member (seal member), the elastic member seals the space between the seal member and the guide member. Due to this sealing action, dust such as paper powder that has fallen from the gap between the slit glass and the guide member and has accumulated on the seal member slips under the guide member and moves, and the lower side of the seal member moves. It does not fall around and fall into the optical system.

According to a third aspect of the present invention, in the first aspect, the elastic member protrudes from one edge of the lower surface of the slit glass so that a non-mounting end of the elastic member contacts an inner wall of the guide member. The feature is that the length is set.

Since the elastic member (seal member) adhered to the lower surface of the slit glass is extended so that one end side comes into contact with the inner wall of the guide member, when the guide member is removed, the paper adhered to the guide member is removed. Dust such as powder falls and remains on the seal member. Thereafter, by removing the slit glass, dust such as the paper dust can be reliably removed from the apparatus.

According to a fourth aspect of the present invention, in the first aspect, the non-mounting end of the elastic member is bent such that the non-mounting end of the elastic member comes into contact with the inner wall of the guide member. There is.

Even when one end of the elastic member (seal member) adhered to the lower surface of the slit glass is bent, dust such as paper dust remains on the seal member as described above, and the slit glass is removed. It can be reliably removed from the device.

According to a fifth aspect of the present invention, in the first aspect, the non-mounting end of the elastic member is folded back, and the folded non-mounting end of the elastic member is in close contact with the lower end of the guide member. There is a feature in doing so.

An elastic member (seal member) by folding back
Are elastically deformed, and the adhesion to the guide member is improved as compared with the case of a single piece, so that dust such as paper dust can be reliably shut off.

The invention according to a sixth aspect is characterized in that, in the fifth aspect, the lower end portion of the guide member is brought into close contact with a portion other than the folded portion of the elastic member.

When dust such as paper dust adhering to the guide member passes under the guide member, the dust such as the paper dust is prevented from dropping from below the elastic member (seal member) to the optical system of the apparatus body. It can be reliably prevented by the folded portion.

The invention according to claim 7 is the invention according to claims 1, 3 to
In any one of 5, a lower end portion of the guide member includes:
Another elastic member different from the elastic member is mounted,
It is characterized in that the elastic member and the other elastic member are brought into close contact with each other.

When another elastic member (elastic member seal) is attached to the lower surface of the guide member (surface in contact with the elastic member), the elastic member seals the space between the elastic member (seal member) and the guide member. It will be. Due to this sealing action, dust such as paper powder that has fallen from the gap between the slit glass and the guide member and has accumulated on the seal member slips under the guide member and moves, and the lower side of the seal member moves. It does not fall around and fall into the optical system.
Further, when the guide member is a rigid body such as a resin molded product, the operation of attaching the elastic seal member is easy, and the assembling efficiency is improved.

According to an eighth aspect of the present invention, in the seventh aspect, the another elastic member is disposed so as to be in close contact with the elastic member upstream of the non-mounting end of the elastic member in the transport direction. There are features.

With another elastic member (elastic seal),
It is possible to prevent dust such as paper dust from moving downstream of the guide member in the document conveying direction.

According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the non-mounting end of the elastic member is located at a position higher than the lower surface of the slit glass.

By making the non-mounting end of the elastic member (seal member) higher than the lower surface of the slit glass, dust such as paper dust does not fall from the seal member when the slit glass is removed.

According to a tenth aspect of the present invention, there is provided an image reading means for stopping and reading an image surface of a document being conveyed, a mounting member for mounting a slit glass above the image reading means, A slit glass placed so as to cover the entire periphery of the opening of the member, a guide member that is adjacent to the slit glass and scoops up a conveyed document, and the slit glass has a lower surface of the slit glass. It is characterized in that it has a shielding member that partially protrudes from one chamfered edge and is mounted so as to be in contact with the guide surface of the guide member in the longitudinal direction.

Since the shielding member (a resin sealing member or a sheet metal member) partially covers the guide surface of the guide member, dust such as paper dust remains on the seal member and the like, and the slit glass is removed. By removing it, it can be reliably removed from the device.

According to the present invention, there is provided an image reading means for stopping and reading an image surface of a document being conveyed, a mounting member for mounting a slit glass above the image reading means, A slit glass placed so as to cover the entire periphery of the opening of the member, a guide member that is adjacent to the slit glass and scoops up the conveyed document, and the slit glass has a slit glass end face. It is characterized in that it has a shielding member mounted so as to partially protrude and contact the guide surface of the guide member in the longitudinal direction.

Since the shielding member (resin sealing member or sheet metal member) partially covers the guide surface of the guide member, dust such as paper dust remains on the seal member and the like, and the slit glass is removed. By removing it, it can be reliably removed from the device. In addition, by bending and mounting the seal member and the like from the lower surface of the slit glass to the end surface, there is no need to chamfer the slit glass.

According to a twelfth aspect of the present invention, in the eleventh aspect, a groove is provided in the guide surface of the guide member in a longitudinal direction, and a non-mounting end of the shielding member is bent and inserted into the groove. It is characterized by having.

By bending the non-mounting end of the shielding member (resin sealing member or sheet metal member) and inserting it into the groove, a portion of the guide surface of the guide member which is not covered by the seal member or the like is formed. Certain debris enters the groove and stays. Therefore, the dust does not move between the seal member and the like and the guide surface of the guide member, and further does not go around from the lower side (the slit glass lower surface side) of the seal member and drop into the optical system.

According to a thirteenth aspect of the present invention, in any one of the tenth to twelfth aspects, the non-mounting end of the shielding member is located at a position higher than the upper surface of the slit glass.

By setting the non-mounting end of the shielding member (a resin sealing member or a sheet metal member) higher than the upper surface of the slit glass, when the slit glass is removed, dust such as paper powder is removed from the sealing member. It will not fall.

According to a fourteenth aspect of the present invention, in any one of the first to thirteenth aspects, the guide member and the slit glass are detachable independently of each other.

In consideration of maintainability in a sheet-through type image reading apparatus, it is preferable that the slit glass and the guide member can be detached independently, and they should not be bonded to each other.

According to a fifteenth aspect of the present invention, in the image forming apparatus, the image reading device according to any one of the first to fourteenth aspects is provided.

In the above-described image reading apparatus, it is possible to prevent dust such as paper dust falling into the gap between the slit glass and the guide member from adhering to the first mirror of the optical system, so that a higher quality image can be formed. Becomes

[0040]

An embodiment of the present invention will be described below with reference to the drawings. [First Embodiment] As shown in FIG. 1, in the image reading apparatus of the present embodiment, a thin elastic member (seal member) 61 is provided on a lower surface of a slit glass 2 in a longitudinal direction, and the thin elastic member 61 is provided. It is configured so as to be interposed between the placing member 41 and the reverse discharge guide 23 while being in close contact with the reverse discharge guide (scooping guide) 23.

In FIG. 1, a slit glass 2 and a contact glass 3 having a thickness of about 3 mm are provided on the upper surface of the image reading apparatus 1. Below the slit glass 2 and the contact glass 3, an exposure lamp 4 and a first mirror 51 are provided.
The exposure lamp 4 and the first mirror 51 are provided.
When reading a document placed on the contact glass 3,
When the original moves in the horizontal direction in FIG. 1 below the contact glass 3, and when reading the original on the slit glass 2,
It stops below the slit glass 2 and irradiates the original surface with the exposure lamp 4 and couples the reflected light through a first mirror 51 and lenses and other optical components 52, 53, 55 to a CCD or the like, as is known. An image is formed on the image element 56. In this embodiment, the exposure lamp 4 and the first mirror
51, second mirror 52, third mirror 53, lens 55, imaging element
56 constitutes an image reading means.

In the image reading apparatus 1, an automatic document feeder (ADF) 6 includes connecting members 153a and 153b such as hinges.
It is connected to the upper part of the main body of the image reading device 1 via (shown in FIG. 2), and can be opened and closed with respect to the image reading device 1. On the lower surface of the ADF 6, there is provided a reflection plate 7 which presses the original placed on the contact glass 3 against the contact glass 3 and serves as a white reference when reading the original.

A document placing table 8 is provided above the ADF 6, and a document bundle P including a plurality of documents is placed on the document placing table 8. The original bundle P placed on the original placing table 8 is fed by a call roller 9 that can be brought into contact with and separated from the original bundle P, and then the uppermost original is moved by a feed belt 10 and a separation roller 11. The paper feed belt 10 presses and contacts the separation roller 11 at an arbitrary angle.

A stopper member 12 is provided downstream of the call roller 9 in the document conveying direction, and the leading end of the document bundle P placed on the document table 8 is stopped by the stopper member 12 and fed. It is forbidden to enter between the belt 10 and the separation roller 11.

A pressure plate 13 is provided below the call roller 9, and the pressure plate 13 is moved toward and away from the call roller 9 about a swing fulcrum by a solenoid (not shown). That is, when the copy start switch is depressed, the pressure plate 13 is moved from a position (shown by a solid line in FIG. 1) to a position in contact with the call roller 9 (shown in FIG. 1). (Indicated by the dashed line)
The document is pressed against the recall roller 9 while being moved about the swinging fulcrum, and the leading end of the document bundle P is separated from the stopper member 12 so as to be able to enter between the sheet feeding belt 10 and the separation roller 11. The original is fed by the call roller 9.

The document separated by the feed belt 10 and the separation roller 11 is reversed along the conveyance path 17 by the first conveyance drive roller 14a and the driven roller 14b, and is conveyed toward the slit glass 2. It has become.

The transport path 17 is constituted by an inner peripheral surface of a case 6a provided to be able to open and close with respect to the main body of the ADF 6, and an outer guide 17a extending between the calling roller 9 and the slit glass 2; The ADF 6 is defined by an inner guide 17b formed on the main body side of the ADF 6 facing the ADF 6a.

The first transport drive roller 14a and the driven roller 14b hold the separated document and transport it to the slit glass 2 through the transport path 17 and then discharge the paper by a reversing discharge guide (scooping guide) 23. The paper is conveyed by being scooped up on the path 20. Further, a reflection guide plate 18 is provided on the slit glass 2, and this reflection guide plate 18 constitutes a white reference at the time of reading and reflects light from the exposure lamp 4.

The original conveyed to the paper discharge path 20 is
The second transport drive roller 19a and the driven roller 19b on the drive side
After being conveyed while being nipped, the paper is nipped by the paper discharge drive roller 21a and the driven roller 21b, and is discharged from the paper discharge path 20 to the outer cover 22.

On the other hand, the reflection plate 7 covering the contact glass 3 is provided on the lower surface of the pressure plate 24,
Is designed to press a document placed on the contact glass 3 against the contact glass 3. The pressure plate 24 is rotatably mounted on a main frame 26 via a fulcrum 25. The main frame 26 is driven by a driven roller.
The end is attached to the shaft of 21b and is fixed to the ADF6 main body.

The main frame 26 has an area that covers the contact glass 3, and has an outer cover 22 attached to the upper surface thereof, and together with the outer cover 22, constitutes a document discharge table. The pressing plate 24 is connected to an auxiliary frame 28 via a link 29. The auxiliary frame 28 is formed in a substantially U-shaped cross section so as to sandwich the outer peripheral portion of the main frame 26, and a fulcrum 27 And is rotatably connected to the main frame 26 via a.

The main frame 26 has a magnet 30
The magnet 30 is provided with an auxiliary frame 28.
Is sucking. The auxiliary frame 28 may be entirely made of metal, or may be entirely made of an elastic member such as plastic so that only the portion attracted to the magnet 30 is made of metal. Further, a part of the paper discharge path 20 is formed at the tip (the left end in FIG. 1) of the auxiliary frame 28, and the driven roller 19b is rotatably provided at the tip.

On the other hand, as shown in FIG. 3, the slit glass 2 is mounted on a mounting member (or bracket) 41 made of sheet metal and having a thickness of about 1 mm. , Is in contact with the mounting member 41. The mounting member 41 is provided with a rectangular hole for image reading, and the slit glass 2 is mounted so as to cover the entire opening of the hole and close the hole. The pressing member 42 also functions as a guide member on the upstream side of the slit glass 2 in the document conveying direction. A sheet-like thin elastic member 61a made of a polyester film or the like is attached to one end of the lower surface of the slit glass 2 in the width direction (longitudinal direction) of the slit glass 2, and the thin elastic member 61a is turned over. It has a shape protruding toward the paper guide 23. The thin elastic member 61a and the slit glass 2 are, for example,
It is bonded with double-sided tape or other adhesive resin.
The non-mounting end of the thin elastic member 61a is a slit glass 2
Are arranged so as to be higher than the lower surface. And
Placement member 41 on contact glass 3 side (right side in FIG. 3)
Then, the slit glass 2 and the reverse discharge guide 23 come into close contact with each other via the thin elastic member 61a.

Here, a method of mounting the contact glass 3 and the slit glass 2 will be described. In FIG.
(A) is a pressing member 42 of the reversing discharge guide 23, (b) is a slit glass 2 on which a thin elastic member 61a is mounted, (c) is a mounting member 41 on the contact glass 3 side, and (d) is a reversing discharge. The contact glass 3 on which the guide 23 is mounted, (e) shows the main body of the image forming apparatus 1, respectively.

In the present embodiment, first, the mounting member 41 is fixed to the main body 1 with screws or the like, and the slit glass 2 is mounted on the mounting member 41 (right side in FIG. 3). The paper guide 23 and the contact glass 3 are placed on the placing member 41 (in FIG. 3,
(Left side), and then use the holding member 42 to turn over the inverted paper discharge guide.
By pressing 23, the contact glass 3 and the slit glass 2 are mounted. In this case, as shown in FIG. 3, the slit glass 2 and the reverse discharge guide 23 come into close contact with the placing member 41 via the thin elastic member 61a. In addition, a step is provided between the slit glass 2 and the reverse discharge guide 23 for scooping up the original and transporting the original in the discharge direction. These members 2 and 23 are bonded or integrally formed. Because it is not configured, there is a slight gap between the two. That is, the step is caused by the slit glass 2
Is required to be scooped up from a position slightly lower than the upper surface of the slit glass 2 and to enter the sheet discharging direction (indicated by an arrow in FIG. 3). For this reason, the reverse paper discharge guide 23 downstream of the slit glass 2 cannot be mounted so as to cover the end surface of the contact glass 2 like the upstream guide (pressing member) 42, and a slight gap is formed. The reversing sheet discharge guide 23 is integrally formed with a scale for abutting and positioning a document at a predetermined position on the contact glass 3, and a back surface of the scale portion (a surface where the scale is in contact with the contact glass 3). ), A white reference plate (not shown) is adhered.

Incidentally, it is conceivable that the slit glass 2, the reversing sheet discharge guide 23, the pressing member 42, and the contact glass 3 are integrally formed so that paper dust or the like does not fall on the reading section below the slit glass 2. However, in this case, maintenance work is not easy. It is also conceivable to integrally form the slit glass 2, the reversing discharge guide 23, and the pressing member 42, but in this case, it becomes difficult to position the reversal discharge guide 23, the contact glass 3, and the scale.

Next, the operation of the present embodiment will be described. When the original bundle P is placed on the original placing table 8 and the start switch is pressed down, the pressing plate 13 presses the original bundle P against the call roller 9 so that the leading end of the original bundle P The portion is separated from the stopper member 12 so as to be able to enter between the sheet feeding belt 10 and the separation roller 11. Next, call roller 9
Is driven to move the upper portion of the original bundle P to the feed belt 10.
And is transported between the separation rollers 11.

This bundle of originals P is separated from the uppermost original by the feed belt 10 and the separation roller 11,
After being conveyed onto the slit glass 2 along the conveyance path 17 by the first conveyance driving roller 14a and the driven roller 14b, the original surface is read by the exposure lamp 4 and the first mirror 5 by the slit glass 2. After scanning is completed,
After being transported on the transport path 20 by the second transport drive roller 19a and the driven roller 19b, the paper is discharged onto the outer cover 22 by the paper discharge drive roller 21a and the driven roller 21b.

The original P passing through the slit glass 2 is rubbed by the friction with the slit glass 2 so that
63 occurs. The paper dust 63 attempts to enter the main body of the image reading apparatus 1 through the reverse discharge guide 23 and the slit glass 2 and between the slit glass 2 and the placing member 41.

In the present embodiment, since the thin elastic member 61a having a shape partially protruding toward the reversing sheet discharge guide 23 is mounted on the lower surface of the slit glass 2, it is generated when the document P passes through the slit glass 2, Paper dust 63 that has entered between the reversing discharge guide 23 and the slit glass 2 due to the influence of vibration of the apparatus can be blocked by the thin elastic member 61a, and the image is read between the slit glass 2 and the placing member 41. It is possible to prevent the device 1 from entering the main body. Also, the holding member 42
Remove the reverse discharge guide 23 and contact glass 3
When the slit glass 2 is removed from the mounting member 41 after removal, the paper dust 63 is removed together with the slit glass 2 while remaining on the thin elastic member 61a. 63 is removed from the main body of the image reading apparatus 1. Therefore, the exposure lamp 4 and the first mirror 51
And the back surface of the slit glass 2 can be reliably prevented from being stained, and the image of the document P can be read normally.

The present invention is not limited to this embodiment, and an elastic member (corresponding to 62a in FIG. 5 described later) may be provided at one end of the reversing discharge guide 23. With this configuration, the adhesiveness between the thin elastic member 61a and the reversing discharge guide 23 can be further enhanced.

[Second Embodiment] FIG. 5 is a sectional side view of a main part of an image reading apparatus according to a second embodiment of the present invention. Since the overall configuration is almost the same as that of the first embodiment, FIG. 1 is used and the same components are given the same reference numerals, and description thereof is omitted.

This embodiment is different from the first embodiment in that one end of a thin elastic member (seal member) 61b attached to the lower surface of the slit glass 2 comes into contact with the inner wall of a reversing discharge guide (scooping guide) 23. So that the length of the thin elastic member 61b protrudes from one edge of the lower surface of the slit glass, and one end of the reversing discharge guide 23 has a thin elastic member 61b.
The difference is that another elastic member (elastic seal) 62a different from 61b is provided. With this configuration, the thin elastic member 61
When the inverted paper discharge guide 23 is made of a resin molded product or the like, the adhesion of the elastic member 62a can be easily performed.

In FIG. 5, on the lower surface of the slit glass 2, a thin elastic member 61b made of a polyester film or the like partially projecting toward the reversing discharge guide 23 and overlapping the placing member 41 is mounted. The thin elastic member 61b has a length in the transport direction such that the thin elastic member 61b comes into contact with the inner wall of the inverted paper discharge guide 23 or bends when it comes into contact with the inner wall of the inverted paper discharge guide 23. In addition, the reverse paper ejection guide
An elastic member made of foamed polyurethane, etc. at one end of 23
62a is mounted, and this elastic member 62a is a thin elastic member.
It is in close contact with 61b. Therefore, the slit glass 2 is placed on the mounting member 41 (the right side in FIG. 5) via the thin elastic member 61b.
The reverse discharge guide 23 comes into close contact with the placing member 41 (the right side in FIG. 5) via the elastic member 62a and the thin elastic member 61b. The elastic member 62a and the reverse discharge guide 23 are adhered, for example, with a double-sided tape or another adhesive resin.

In the present embodiment, paper dust 63 generated when the document P passes through the slit glass 2 and enters between the reverse discharge guide 23 and the slit glass 2 is provided at one end of the reverse discharge guide 23. The paper member 63 can be reliably blocked by the elastic member 62a, and can be prevented from entering the main body of the image reading apparatus 1 through the space between the slit glass 2 and the placing member 41. Also, remove the presser member 42, and
When the slit glass 2 is removed from the mounting member 41 after removing the contact glass 23 and the contact glass 3, the thin elastic member 61b
Is opened, and the paper dust 63 is removed together with the slit glass 2 while remaining on the thin elastic member 61b. Accordingly, the paper dust 63 is surely removed from the main body of the image reading apparatus 1. Will be removed. For this reason, the exposure lamp 4, the first mirror 51, and the back surface of the slit glass 2 can be reliably prevented from being stained, and the image of the document P can be read normally. Further, since the reversing discharge guide 23 is a rigid body such as a resin molded product, the work of attaching the elastic member 62a is easy and the assembling efficiency is high.

The length of the thin elastic member 61b in the transport direction is set so as not to reach one end (the right end in FIG. 5) of the placing member 41 according to the first embodiment. May be. Also in this case, the paper dust 63 that has entered between the reverse discharge guide 23 and the slit glass 2 can be blocked by the elastic member 62a provided at one end of the reverse discharge guide 23.

Further, the present invention is not limited to this embodiment. One end of the thin elastic member 61b (the right end in FIG. 5) may be bent so that one end of the thin elastic member 61b is in contact with the inner wall of the reverse discharge guide 23. Alternatively, the elastic member 62a may be brought into close contact with the folded portion or the inside of the bent portion (the left side in FIG. 5). In this case also,
The paper dust 63 that has entered between the slit 23 and the slit glass 2 can be blocked by the elastic member 62 a provided on the reversing discharge guide 23.

[Third Embodiment] FIG. 6 is a sectional side view of a main part of an image reading apparatus according to a third embodiment of the present invention. Since the overall configuration is almost the same as that of the first embodiment, FIG. 1 is used and the same components are given the same reference numerals, and description thereof is omitted.

This embodiment is different from the first embodiment in that one end of a thin elastic member (seal member) 61c mounted on the lower surface of the slit glass 2 is folded, and one end of the folded thin elastic member 61c is folded. Are arranged so as to be in close contact with a reversing discharge guide (scooping guide) 23. With this configuration, it is possible to improve the adhesion between the thin elastic member 61c and the reverse discharge guide 23 without providing another elastic member (corresponding to 62a in FIG. 5).

In FIG. 6, on the lower surface of the slit glass 2, a sheet-like thin elastic member 61c made of a polyester film or the like is mounted.
The non-mounting end is folded upward. One end of the inverted discharge guide 23 is pressed against the folded end of the thin elastic member 61c, and the folded portion of the thin elastic member 61c is located outside (right side in FIG. 6) of the inverted discharge guide 23 at one end. Is formed. Accordingly, the slit glass 2 is thin elastic member 61
6, the reverse discharge guide 23 is brought into close contact with the thin elastic member 61c by the spring force of the folded thin elastic member 61c, and the thin elastic member 61c. 6 comes into close contact with the mounting member 41 (right side in FIG. 6).

In the present embodiment, since the thin elastic member 61c whose folded end is folded so as to be in close contact with one end of the inverted discharge guide 23 is attached to the lower surface of the slit glass 2, the original P is The paper dust 63 generated when the paper passes through the reverse discharge guide 23 and the slit glass 2 can be blocked by the thin elastic member 61c and the reverse discharge guide 23.
And enters the main body of the image reading apparatus 1 through the space between the image forming apparatus 1 and the mounting member 41 through the outside of the reversing discharge guide 23.
41 can be prevented from being deposited. Further, when the slit glass 2 is removed from the placing member 41 after the holding member 42 is removed and the inverted paper discharge guide 23 and the contact glass 3 are removed, the paper dust 63 remains on the thin elastic member 61c. Since the paper dust 63 is removed together with the slit glass 2, the paper dust 63 is removed from the main body of the image reading apparatus 1. Further, since the folded end portion is in close contact with one end of the reverse discharge guide 23, the paper dust 63 is deposited between the folded end portion and the end surface of the slit glass 2 (the right side in FIG. 6). Here, as described above, when the slit glass 2 is removed from the mounting member 41, even if the folded portion of the thin elastic member 61c is elastically deformed and opened, the paper dust 63 remains in the opening of the thin elastic member 61c. It remains and does not move to the mounting member 41 side. Therefore, the exposure lamp 4 and the first mirror 51
And the back surface of the slit glass 2 can be reliably prevented from being stained, and the image of the document P can be read normally.

It should be noted that the present invention is not limited to this embodiment,
The folded end of 61c may be disposed outside (one side in FIG. 6) outside one end of the inverted sheet discharge guide 23. With this configuration, the thin elastic member 61
Even if the paper dust 63 passes through the gap between the reverse paper ejection guide 23 and the reverse paper discharge guide 23, the folded portion of the thin elastic member 61c can reliably prevent the gap.

Further, by applying the second embodiment to this embodiment, an elastic member (corresponding to 62a in FIG. 5) may be provided at one end of the reversing discharge guide 23. With this configuration, the thin elastic member
The adhesiveness between 61c and the reverse discharge guide 23 can be further enhanced.

[Fourth Embodiment] FIG. 7 is a sectional side view showing a main part of an image reading apparatus according to a fourth embodiment of the present invention. Since the overall configuration is almost the same as that of the first embodiment, FIG. 1 is used and the same components are given the same reference numerals, and description thereof is omitted.

This embodiment is different from the first embodiment in that the thin elastic member (seal member) 61d attached to the lower surface of the slit glass 2 is provided at the non-attached end with another thin elastic member 61d that is different from the thin elastic member 61d in the longitudinal direction. The difference is that an elastic member (elastic body seal) 62b is attached, and another elastic member 62b is set to be thicker than the thin elastic member 61d. With this configuration, the gap between the thin elastic member 61d and the reversing paper ejection guide 23 is
Even if 63 passes through, an effect is obtained that the elastic member 62b can reliably prevent the passage.

In FIG. 7, on the lower surface of the slit glass 2, a sheet-like thin elastic member 61d made of a polyester film or the like is mounted.
An elastic member 62b made of a foamed polyurethane or the like is attached to the non-attached end. The thin elastic member 61d and the elastic member 62b are adhered by, for example, a double-sided tape or another adhesive resin. Further, the reversing sheet discharge guide 23 is arranged such that one end thereof is pressed into contact with the thin elastic member 61d on the inner side (the left side in FIG. 7) of the elastic member 62b. Therefore, the slit glass 2 is in close contact with the placing member 41 (the right side in FIG. 7) via the thin elastic member 61d, and the reverse discharge guide 23
Comes into close contact with the mounting member 41 (the right side in FIG. 7) via the thin elastic member 61d.

In the present embodiment, the paper dust 63 generated when the document P passes through the slit glass 2 and enters between the reversing discharge guide 23 and the slit glass 2 is removed by the thin elastic member 61d and the reversing discharge guide. 23, a gap is formed between the thin elastic member 61d and the reversing discharge guide 23 due to vibrations during document reading, and even if the paper dust 63 passes through the gap, the gap is blocked by the elastic member 62b. Accordingly, it is possible to prevent the paper dust 63 from entering the main body of the image reading apparatus 1 through the space between the slit glass 2 and the placing member 41. Also, when the slit glass 2 is removed from the placing member 41 after the holding member 42 is removed and the inverted paper discharge guide 23 and the contact glass 3 are removed, the paper dust 63 is removed from the slit glass 2 on the thin elastic member 61d. Since the paper dust 63 is removed together with the slit glass 2 while remaining between the end face and the elastic member 62b, the paper dust 63 is removed from the main body of the image reading apparatus 1 accordingly. Therefore, the exposure lamp 4
The first mirror 51 and the back surface of the slit glass 2 can be reliably prevented from being stained, and the image of the document P can be read normally.

[Fifth Embodiment] FIG. 8 is a sectional side view showing a main part of an image reading apparatus according to a fifth embodiment of the present invention. Since the overall configuration is almost the same as that of the first embodiment, FIG. 1 is used and the same components are given the same reference numerals, and description thereof is omitted.

The present embodiment is different from the first embodiment in that a part of the slit glass 2 protrudes from one chamfered edge of the lower surface and is mounted so as to be in contact with the guide surface of the reversing discharge guide 23 in the longitudinal direction. The difference is that a thin elastic member 61e is provided. With this configuration, an effect is obtained in which the paper powder 63 can be reliably prevented from entering the gap between the slit glass 2 and the reverse discharge guide 23 by the partial end surface of the slit glass 2 and the thin elastic member 61e.

In FIG. 8, the slit glass 2 is chamfered from the lower surface to the end surface, and a sheet-like thin elastic member 61e made of a polyester film or the like is mounted on the chamfered portion. This thin elastic member 61
The non-mounting end side of e
23 are arranged so as to contact a part of the guide surface.

In the present embodiment, by appropriately setting the length of the thin elastic member 61e in the document conveyance direction, the paper dust 63 generated when the document P passes through the reverse discharge guide 23 from the slit glass 2 is reduced. It can be shielded by the thin elastic member 61e and a part of the end surface of the slit glass 2, thereby preventing the paper dust 63 from entering the main body of the image reading apparatus 1 through the space between the slit glass 2 and the placing member 41. be able to. Further, when the slit glass 2 is removed from the placing member 41 after the holding member 42 is removed and the reversing sheet discharge guide 23 and the contact glass 3 are removed, the paper dust 63 is removed by the thin elastic member 61e.
Since the paper dust 63 is removed together with the slit glass 2 while remaining on the top, the paper dust 63 is removed from the main body of the image reading apparatus 1 accordingly. Therefore, the exposure lamp 4
The first mirror 51 and the back surface of the slit glass 2 can be reliably prevented from being stained, and the image of the document P can be read normally. In addition, the above-mentioned sheet-like thin elastic member
Instead of 61e, a rigid sheet metal member may be used.

[Sixth Embodiment] FIG. 9 is a sectional side view showing a main part of an image reading apparatus according to a sixth embodiment of the present invention. Since the overall configuration is almost the same as that of the first embodiment, FIG. 1 is used and the same components are given the same reference numerals, and description thereof is omitted.

This embodiment is different from the first embodiment in that a part of the slit glass 2 protrudes from the end face,
The difference is that a thin elastic member 61f mounted so as to be in contact with the 23 guide surfaces in the longitudinal direction is provided. With this configuration, the paper dust 63 is formed between the slit glass 2 and the reverse discharge guide by the partial end surface of the slit glass 2 and the thin elastic member 61f.
This has the effect of reliably preventing entry into the 23 gaps.

In this embodiment, a sheet-like thin elastic member 61f is mounted from the lower surface of the slit glass 2 to a part of the end surface. When projecting the thin elastic member 61f from the partial end surface, the original P is set in the document conveying direction by appropriately setting the length of the thin elastic member 61f in the document conveying direction.
Paper dust 63 generated when the paper passes through the reverse discharge guide 23
Can be blocked by the thin elastic member 61f and a part of the end surface of the slit glass 2, so that the paper dust 63 passes between the slit glass 2 and the placing member 41 and enters the main body of the image reading apparatus 1. Can be prevented. Also, holding member
When the slit glass 2 is removed from the placing member 41 after removing the reverse discharge guide 23 and the contact glass 3 after removing the 42, the paper dust 63 remains together with the slit glass 2 while remaining on the thin elastic member 61f. Since the paper dust 63 is removed, the paper dust 63 is removed from the main body of the image reading apparatus 1 accordingly. Therefore, the exposure lamp 4 and the first mirror
The back surface of the slit 51 and the slit glass 2 can be reliably prevented from being stained, and the image of the document P can be read normally. Further, since the thin elastic member 61f is attached from the lower surface to the end surface of the slit glass 2 and the thin elastic member 61f is bent and brought into contact with the guide surface of the reversing paper discharge guide 23, there is no need to chamfer the slit glass 2. . Note that a rigid sheet metal member may be used instead of the sheet-like thin elastic member 61f described above.

[Seventh Embodiment] FIG. 10 is a sectional side view showing a main part of an image reading apparatus according to a seventh embodiment of the present invention. Since the overall configuration is almost the same as that of the first embodiment, FIG. 1 is used and the same components are given the same reference numerals, and description thereof is omitted.

This embodiment is different from the first embodiment in that a part of the slit glass 2 protrudes from the end face of the slit glass 2,
A sheet-like thin elastic member 61g is provided so as to be in contact with the guide surface of the reverse discharge guide 23 in the longitudinal direction.
Is provided, and the non-attached end of the thin elastic member 61g is bent to form a groove.
The difference is that it is inserted into 23a. With this configuration, dust such as paper dust 63 on the guide surface of the reverse discharge guide 23 is
Since the paper dust 63 enters and stays in the groove 23a, an effect is obtained that the paper dust 63 can be reliably prevented from entering the gap between the slit glass 2 and the reverse discharge guide 23.

In this embodiment, according to the sixth embodiment, a sheet-like thin elastic member 61g is mounted from the lower surface of the slit glass 2 to a part of the end surface. Further, a groove 23a is formed on the guide surface of the reversing discharge guide 23 in the longitudinal direction.
The bent end of the thin elastic member 61g is inserted into the groove 23a. Also, the groove 23a
Is provided at a position higher than the upper surface of the slit glass 2. Therefore, the paper dust 63 generated when the document P passes through the reverse discharge guide 23 from the slit glass 2 is blocked by the thin elastic member 61g and a part of the end surface of the slit glass 2, and furthermore, the thin elastic member 61g is folded back. The paper dust 63 exceeding the portion enters the groove 23a and stays there. Therefore, it is possible to prevent the paper dust 63 from entering the main body of the image reading apparatus 1 through the space between the slit glass 2 and the placing member 41. Further, since the folded portion of the thin elastic member 61g inserted into the groove 23a is located at a position higher than the upper surface of the slit glass 2, the holding member 42 is removed, and after the inverted sheet discharge guide 23 and the contact glass 3 are removed, the slit is formed. When the glass 2 is removed from the mounting member 41, the paper dust 63 is removed together with the slit glass 2 while remaining on the thin elastic member 61g. It will be removed from the body. Alternatively, as described above, the paper dust 63 remains in the groove 23a. For this reason, the exposure lamp 4, the first mirror 51, and the back surface of the slit glass 2 can be reliably prevented from being stained, and the image of the document P can be read normally. Further, a thin elastic member 61g is attached from the lower surface to the end surface of the slit glass 2, and the thin elastic member 61g is bent and brought into contact with the guide surface of the reversing paper discharge guide 23.
There is no need to chamfer the slit glass 2. In addition,
Instead of the sheet-shaped thin elastic member 61g, a rigid sheet metal member may be used.

In each of the above embodiments, the image reading apparatus has been described. However, the present invention is not limited to this, and the above embodiments may be applied to an image forming apparatus. In this case, as described above,
The image data captured by D56 is subjected to necessary image processing by an image processing unit (not shown), and then sent to a printer unit (not shown) and output.

Here, a thin elastic member (seal member) 61,
61a to 61d and the like constitute the elastic member, thin elastic members (seal members) 61e to 61g and the like constitute the shielding member, and a reversing discharge guide (scooping guide) 23 and the like constitute the guide member. Elastic members (elastic sheets) 62a, 62
b and the like constitute the other elastic member.

[0090]

According to the first aspect of the present invention, an elastic member is provided on the lower surface of the slit glass used in the sheet-through system so as to overlap with a guide member disposed downstream of the slit glass in the document conveying direction. By providing the seal member), dust such as paper dust entering the gap between the slit glass and the guide member can be prevented from moving under the guide member and falling into the optical system below the slit glass.

According to the second aspect of the present invention, another sealing member (elastic seal) is adhered to the elastic member (seal member) provided on the lower surface of the slit glass, so that the sealing member and the guide member can be separated. The dust between the slit glass and the guide member is dropped, and dust such as paper dust accumulated on the seal member moves through the lower side of the guide member and moves under the seal member. It can be prevented from wrapping around from the side and dropping into the optical system.

According to the third aspect of the present invention, since the elastic member (seal member) provided on the lower surface of the slit glass is extended so that one end thereof comes into contact with the inner wall of the guide member, it adheres to the guide member. Dust such as paper dust falls on the seal member and remains, and can be reliably removed when removing the guide member and the slit glass.

According to the fourth aspect of the present invention, dust such as paper dust can be removed from the sealing member by bending one end of the elastic member (seal member) adhered to the lower surface of the slit glass as described above. Since it remains on the upper surface, it can be reliably removed when the guide member and the slit glass are removed.

According to the fifth aspect of the present invention, the elastic member (seal member) is elastically deformed by folding, and the adhesive force with the guide member is improved as compared with the case of a single member, so that dust such as paper dust can be reliably removed. Can be shut off.

According to the sixth aspect of the present invention, when dust such as paper dust attached to the guide member passes under the guide member, the dust such as paper dust is removed from under the elastic member (seal member). The fall-back portion can reliably prevent the device from falling into the optical system.

According to the seventh aspect of the present invention, another elastic member (elastic seal) is attached to the lower surface (the surface that comes into contact with the elastic member) of the guide member, so that the elastic member (seal member) is in contact with the guide member. The space between the guide members is sealed, and dust such as paper dust that has fallen from the gap between the slit glass and the guide members and has accumulated on the seal member passes through the lower side of the guide member and moves. It is possible to prevent the member from wrapping around from below the member and dropping into the optical system. When the guide member is a rigid body such as a resin molded product, the operation of attaching the elastic seal member is easy, and the assembling property is good and the productivity is improved.

According to the eighth aspect of the present invention, the movement of dust such as paper dust downstream of the guide member in the feeding direction can be prevented by another elastic member (elastic seal).

According to the ninth aspect of the present invention, when the non-mounting end of the elastic member (seal member) is made higher than the lower surface of the slit glass, when the slit glass is removed, dust such as paper dust is removed from the seal member. From falling off.

According to the tenth aspect of the present invention, since the shielding member (a resin sealing member or a sheet metal member) covers a part of the guide surface of the guide member, dust such as paper dust can be removed from the sealing member. And can be reliably removed from the apparatus by removing the slit glass.

According to the eleventh aspect of the present invention, since the shielding member (a resin sealing member or a sheet metal member) covers a part of the guide surface of the guide member, dust such as paper dust can be removed from the seal member. And can be reliably removed from the apparatus by removing the slit glass. Furthermore, it is not necessary to chamfer the slit glass by mounting the sealing member or the like from the lower surface of the slit glass to the end surface and bending a part of the slit glass to contact the guide surface.

According to the twelfth aspect of the present invention, the non-mounting end of the shielding member (a resin sealing member or a sheet metal member) is bent and inserted into the groove of the guide surface of the guide member, so that the paper Since the dust remains on the seal member or the like or enters the groove and stays, the dust moves between the seal member or the like and the guide surface of the guide member, and further, the seal member or the like. Does not fall from the lower side (the lower side of the slit glass) and fall into the optical system.

According to the thirteenth aspect of the present invention, when the non-mounting end of the shielding member (resin sealing member or sheet metal member) is made higher than the upper surface of the slit glass, paper dust is removed when the slit glass is removed. Dust can be prevented from falling from the seal member or the like.

According to the fourteenth aspect of the present invention, since the slit glass and the guide member can be detached independently, the maintainability of the sheet-through type image reading apparatus is improved.

According to the invention of claim 15, dust such as paper dust falling into the gap between the slit glass and the guide member can be prevented from adhering to the first mirror of the optical system as described above. In image formation, quality deterioration can be avoided.

As described above, according to the present invention, while maintaining the detachability of the slit glass, paper dust and the like generated when the document passes through the slit glass fall into the optical system in the apparatus main body. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a configuration of an image reading apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an open state of the image reading apparatus according to the first embodiment of the present invention.

FIG. 3 is a side sectional view of a main part of the image reading apparatus according to the first embodiment of the present invention.

FIG. 4 is an exploded view of a main part of the image reading apparatus according to the first embodiment of the present invention.

FIG. 5 is a side sectional view of a main part of an image reading apparatus according to a second embodiment of the present invention.

FIG. 6 is a side sectional view of a main part of an image reading apparatus according to a third embodiment of the present invention.

FIG. 7 is a side sectional view of a main part of an image reading apparatus according to a fourth embodiment of the present invention.

FIG. 8 is a side sectional view of a main part of an image reading apparatus according to a fifth embodiment of the present invention.

FIG. 9 is a side sectional view of a main part of an image reading apparatus according to a sixth embodiment of the present invention.

FIG. 10 is a side sectional view of a main part of an image reading apparatus according to a seventh embodiment of the present invention.

FIG. 11 is a side sectional view of a main part of a conventional image reading apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Image reading device (main body) 2 Slit glass 6 Automatic document feeder (ADF) 23 Reversing discharge guide (scooping-up guide 23 a Groove 41 Mounting member 61, 61 a to 61 g Thin elastic member (seal member) 62 a, 62 b Elastic member (Elastic seal) 63 Dust such as paper dust P Original

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H076 AA04 AA91 BA02 BA15 BA17 BA24 BA35 BA36 BA47 BA63 BA65 BA95 BA97 2H108 AA05 JA02 2H109 AA02 CA21 3F101 FA01 FB17 FC07 FC11 LA05 LA11 LB02 5C062 AA02 AA05 AB02 AB30 AB06 AD06

Claims (15)

[Claims] An image reading means for stopping an image surface of a document being conveyed for reading, a mounting member on which a slit glass is mounted above the image reading means, and an entire peripheral portion of an opening of the mounting member. A slit glass placed so as to cover and a guide member adjacent to the slit glass and scooping up the conveyed document, the slit glass partially protruding from one edge of the lower surface of the slit glass. And an elastic member mounted in the longitudinal direction so as to overlap with the placing member. The elastic member is interposed between the placing member and the guide member while being in close contact with the lower end of the guide member. An image reading apparatus, comprising: 2. A non-mounting end of the elastic member is provided with another elastic member different from the elastic member in a longitudinal direction, and the other elastic member is set to be thicker than the elastic member. The image reading device according to claim 1, wherein: 3. A length of the elastic member protruding from one edge of the lower surface of the slit glass so that a non-mounting end of the elastic member contacts an inner wall of the guide member. Item 2. The image reading device according to Item 1. 4. The image reading apparatus according to claim 1, wherein the non-mounting end of the elastic member is bent so that the non-mounting end of the elastic member contacts the inner wall of the guide member. 5. The non-mounting end of the elastic member is folded back, and the folded non-mounting end of the elastic member is brought into close contact with the lower end of the guide member. The image reading device according to claim 1. 6. The image reading apparatus according to claim 5, wherein a lower end portion of the guide member is in close contact with a portion other than the folded portion of the elastic member. 7. The lower end of the guide member is provided with another elastic member different from the elastic member, so that the elastic member and the other elastic member are in close contact with each other. Item 6. The image reading device according to any one of Items 1, 3 to 5. 8. The image reading apparatus according to claim 7, wherein said another elastic member is disposed so as to be in close contact with said elastic member upstream of a non-mounting end of said elastic member in a conveying direction. . 9. The image reading apparatus according to claim 1, wherein a non-mounting end of the elastic member is located at a position higher than a lower surface of the slit glass. 10. An image reading means for stopping and reading an image surface of a document being conveyed, a mounting member for mounting a slit glass above the image reading means, and an entire periphery of an opening of the mounting member. A slit glass placed so as to cover and a guide member adjacent to the slit glass and scooping up the conveyed original document, the slit glass is formed from one chamfered edge of the lower surface of the slit glass. Partially protruding,
An image reading apparatus comprising: a shielding member mounted so as to be in contact with a guide surface of the guide member in a longitudinal direction. 11. An image reading means for stopping and reading an image surface of a document being conveyed, a mounting member for mounting a slit glass above the image reading means, and an entire periphery of an opening of the mounting member. A slit glass placed so as to cover and a guide member adjacent to the slit glass and scooping up the conveyed document, wherein the slit glass partially protrudes from an end surface of the slit glass and has a guide member. An image reading apparatus having a shielding member mounted so as to be in contact with the guide surface of the image forming apparatus in the longitudinal direction. 12. The guide member according to claim 11, wherein a groove is provided on a guide surface of the guide member in a longitudinal direction, and a non-mounting end of the shielding member is bent and inserted into the groove. Image reading device. 13. The image reading device according to claim 10, wherein a non-mounting end of the shielding member is located at a position higher than an upper surface of the slit glass. 14. The image reading apparatus according to claim 1, wherein the guide member and the slit glass are detachable independently of each other. 15. An image forming apparatus provided with the image reading device according to claim 1.