JP3816411B2 - Image reading device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image reading apparatus such as a copying machine, a facsimile apparatus, and a scanner apparatus, and more particularly to an image reading apparatus having a function of eliminating static electricity generated on an original contact surface of a contact glass.
[0002]
[Prior art]
Image reading devices such as copying machines, facsimile machines, and scanner devices have a scanning optical system for reading a document, and the document is placed on a transparent contact glass provided above the scanning optical system. When the original is read by moving the scanning optical system below the contact glass and scanning the original surface, or with a sheet-through type original conveyance device, the original is conveyed on the contact glass. The scanning optical system is stopped below the contact glass, and the document is read while moving the document.
[0003]
Regardless of the scanning method, since the document comes into contact with the contact glass, static electricity is generated by friction between the document and the contact glass. By grounding the metal frame of the device, static electricity is prevented from being charged to the contact glass. In particular, in an image reading apparatus equipped with a sheet-through type document conveying device, the document is conveyed on the contact glass, and the document and the contact glass are rubbed violently, so that accumulation of static electricity is surely prevented. There is a need.
[0004]
As a conventional image reading apparatus of this type, for example, there is an apparatus described in Japanese Patent Laid-Open No. 10-307345. This includes a contact glass having a conductive surface applied to the contact surface of the original, an original scale provided at the end of the contact glass, which contacts the end of the original to align the reading position of the original, and the original scale. It is attached to the lower surface with double-sided tape, etc., and one end is in contact with the conductive processing surface of the contact glass, and the other end is in contact with the metal frame, and a grounding plate that drops the static electricity charged on the contact glass to the metal frame side. ing.
[0005]
[Problems to be solved by the invention]
However, in such a conventional image reading apparatus, since the earth plate is attached to the document scale by the double-sided tape, it is troublesome to attach the earth plate, and when the document scale is made of a resin member, There is a possibility that the original scale may not be recycled due to damage after the ground plate is removed.
[0006]
Further, since the ground plate is attached to the original scale side, it is difficult to distinguish between the contact glass that has been subjected to the conductive treatment and the contact glass that has not been subjected to the conductive treatment.
[0007]
On the other hand, if a metallic document scale is used, a ground plate is not necessary. In this case, however, the processing cost of the document scale is high, and the document scale becomes hot due to the heat of the light source of the scanning optical system.
[0008]
In addition, it is conceivable to fix the contact glass to the metal frame with a grounding plate such as a leaf spring. However, in such a case, the contact glass is not easily attached and detached, and extra time is required during maintenance. Work will occur.
[0009]
Therefore, the present invention enables the grounding member to be easily attached to and detached from the contact glass so that the mounting operation can be easily performed, and the contact glass and the grounding member can be easily separated and recycled. It is another object of the present invention to provide an image reading apparatus that can easily visually recognize a contact glass that has been subjected to a conductive treatment.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides an image reading apparatus that includes a contact glass that can be mounted facing the scanning optical system and is subjected to a conductive treatment on one surface that contacts a document. A grounding member made of a flexible metal member having a substantially U-shaped cross section is mounted on the base, and the grounding member projects from the bottom plate and both ends of the bottom plate, and sandwiches one surface and the other surface of the contact glass. In addition, the width of the side plate that comes into contact with one surface of the contact glass of the pair of side plates is formed of a pair of side plates in which the gap at the front end in the protruding direction is smaller than the thickness of the contact glass in a free state. A taper is formed in at least one of the directions, and the contact glass is attached to the support portion of the metal frame through the grounding member.
[0011]
In that case, the grounding member is made of a flexible metal member, and in the free state, the gap at the tip in the protruding direction is formed smaller than the thickness of the contact glass. Can be installed. In addition, the grounding member can be brought into close contact with the contact glass after attachment, and the contact glass can be reliably grounded to the metal frame via the grounding member.
[0012]
In addition, since the grounding member is flexible, it can be easily removed from the contact glass, the work of separating and discarding the contact glass and the grounding member can be simplified, and handling during recycling is also possible. It can be done easily.
[0013]
In addition, since the contact glass is attached to the support portion of the metal frame via the grounding member, the grounding member can function as a cushioning material, and the contact glass is contacted as compared with the contact glass attached directly to the support portion of the metal frame. It is possible to prevent the glass from being damaged by an impact or the like.
[0014]
In addition, if the grounding member is attached to the contact glass that has been subjected to the conductive treatment before the contact glass is incorporated into the image reading apparatus, the contact glass that has been subjected to the conductive treatment and the contact that has not been subjected to the conductive treatment are used. Glass can be easily distinguished.
Also, when the side plate on which the taper is not formed is brought into contact with the corner of the contact glass and the grounding member is rotated in this state, the side plate on which the taper is formed is attached to the contact glass along the taper. The ground member can be more easily attached by contact glass.
[0015]
Further, in order to solve the above-described problems, the present invention provides a projecting direction of the side plate that contacts the other surface of the contact glass with respect to the side plate that contacts the one surface of the contact glass subjected to the conductive treatment. It is characterized by its long length.
[0016]
In that case, when attaching the grounding member to the end of the contact glass, the grounding member can be easily attached to the contact glass by rotating the grounding member so that the long side plate slides to the end of the contact glass. Can do.
[0017]
In addition, since the long side plate adheres to the other surface of the contact glass in a wide area, the grounding member does not float from the contact glass, and when the contact glass is attached to the support member of the metal frame, It is possible to prevent the accuracy in the thickness direction from being lowered.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
1 to 4 are diagrams showing a first embodiment of an image reading apparatus according to the present invention, and the image reading apparatus can be applied to a copying machine, a facsimile machine, a scanner apparatus and the like.
[0022]
First, the configuration will be described. In FIG. 1, reference numeral 1 denotes an image reading device, and a first contact glass 2 and a second contact glass 3 are provided on the upper surface of the image reading device 1.
[0023]
Below the first contact glass 2 and the second contact glass 3, an exposure lamp 4a, mirrors 4b, 4c and 4d, a lens 4e and a CCD 4f are provided as a scanning optical system.
[0024]
The exposure lamp 4a and the mirror 4b move in the left-right direction in FIG. 1 below the second contact glass 3 when reading a document placed on the second contact glass 3, and the first contact glass When reading an original on 2, the image information read by the exposure lamp 4a is reflected by the mirrors 4b, 4c, 4d and then the lens 4e. Is focused and imaged on the CCD 4. Image information read by the CCD 4 is subjected to photoelectric conversion, subjected to image processing by an image processing unit (not shown), and then output to a printer unit (not shown).
[0025]
An automatic document feeder (hereinafter simply referred to as ADF) 6 is mounted on the upper part of the image reading apparatus 1, and a document placed on the second contact glass 3 is placed on the lower surface of the ADF 6 as the second contact glass. 3 and a reflecting plate 7 that serves as a white reference when reading a document. The ADF 6 is connected to the image reading apparatus 1 via a hinge (not shown) and can be opened and closed with respect to the image reading apparatus 1.
[0026]
A document placing table 8 is provided above the ADF 6, and a document bundle P composed of a plurality of documents is placed on the document placing table 8. The original bundle P placed on the original placement table 8 is fed by a calling roller 9 that can be brought into contact with and separated from the original bundle P, and then the uppermost original is placed by a separation belt 10 and a separation prevention roller 11. Are to be separated.
[0027]
Further, a stopper member 12 is provided downstream of the calling roller 9 in the document conveyance direction, and the document bundle P placed on the document table 8 is stopped by the stopper member 12 and enters the separation belt 10 side. Is prohibited.
[0028]
A pressure plate 13 is provided below the call roller 9, and the pressure plate 13 is brought into contact with and separated from the call roller 9 by a solenoid (not shown). That is, when the copy start switch is pressed, the pressure plate 13 is moved from a position separated from the calling roller 9 indicated by a solid line by a solenoid to a position abutting on the calling roller 9 indicated by a virtual line, and the original is called. The roller 9 is pressurized and the original is fed by the calling roller 9.
[0029]
The original separated by the separation belt 10 and the separation prevention roller 11 is reversed along the reversing path 15 by the conveyance driving roller 14a and the conveyance driven roller 14b on the driving side, and conveyed toward the first contact glass 2. It is like that. Further, a reflection guide plate 16 constituting a white reference at the time of reading is provided on the upper portion of the first contact glass 2, and an exposure lamp is passed while the document is passed between the first contact glass 2 and the reflection guide plate 16. It is read by a scanning optical system having 4a and the like.
[0030]
The document that has been read is transported so as to be scooped up to the paper discharge path 18 by the reverse paper discharge guide 17, and the document scooped up to the paper discharge path 18 is transferred to the transport driving roller 19a and the transport driven roller 19b. After being nipped and transported, the paper is nipped by the paper discharge drive roller 21a and the paper discharge driven roller 21b, discharged to the outside from the paper discharge path 18, discharged by the neutralizing brush 22, and then discharged onto the exterior cover 23. Is done.
[0031]
Further, the reflection plate 7 covering the second contact glass 3 is provided on the lower surface of the pressure plate 24, and the pressure plate 24 allows the original placed on the second contact glass 3 to be applied to the second contact glass 3. Pressurized.
[0032]
The pressure plate 24 is rotatably attached to the main frame 26 via a rotation fulcrum 25. The main frame 26 has an end attached to the shaft of the paper discharge driven roller 21b and is fixed to the ADF 6 main body. Yes.
[0033]
The main frame 26 has an area covering the second contact glass 3, and an exterior cover 23 is attached to the upper surface. Further, the pressure plate 24 is connected to an auxiliary frame 28 via a link 27 that is a link mechanism, and this auxiliary frame 28 is formed in a substantially U-shaped cross section so as to sandwich the outer periphery of the main frame 26, It is rotatably connected to the main frame 26 through a fulcrum 29.
[0034]
The main frame 26 is provided with a magnet 30, and the magnet 30 attracts the auxiliary frame 28.
[0035]
On the other hand, as shown in FIG. 2, a conductive film 2a is applied on the upper surface (one surface) of the first contact glass 2 and the third contact glass on the side in contact with the document (although only the first contact glass 2 is illustrated). Since the second contact glass 3 has the same configuration and is not shown), the first contact glass 2 is attached to the support portion 32a of the metal frame 32 of the image reading apparatus 1 via the ground member 31. The second contact glass 3 is also attached to the support portion 32a of the metal frame 32 of the image reading apparatus 1 via the grounding member 31, but this configuration is the same as the first contact glass 2 and is not shown. To do.
[0036]
The ground member 31 is made of a flexible metal member having a thin spring property such as stainless steel or phosphor bronze, and has a substantially U-shaped cross section. Specifically, as shown in FIG. 3, the grounding member 31 protrudes from the bottom plate 31a and both ends of the bottom plate 31a, contacts the upper surface and the lower surface (other surface) of the first contact glass 2, and protrudes in a free state. The gap b at the front end in the direction is composed of a pair of side plates 31b and 31c formed smaller than the plate thickness of the first contact glass 2. Further, the gap a between the protruding base end portions of the side plates 31b and 31c is formed larger than the gap described above.
[0037]
In the present embodiment, the grounding member 31 is made of a flexible metal member, and the gap b at the front end in the protruding direction is formed smaller than the plate thickness of the first contact glass 2 in the free state. It can be easily attached to the end of the glass 2. In addition, the grounding member 31 can be brought into close contact with the first contact glass 2 after attachment, and the first contact glass 2 can be reliably grounded to the metal frame 32 via the grounding member 31. For this reason, it is possible to prevent the first contact glass 2 from being charged with static electricity.
[0038]
In addition, since the grounding member 31 is flexible, it can be easily removed from the first contact glass 2, and the work of separating and discarding the first contact glass 2 and the grounding member 31 can be simplified. In addition, it can be easily handled during recycling.
[0039]
Further, since the first contact glass 2 is attached to the support portion 32a of the metal frame 32 via the grounding member 31, the grounding member 31 can function as a buffer material, and the first contact glass 2 is directly attached to the support portion 32a. The first contact glass 2 can be prevented from being damaged by impact or the like as compared with the manufactured one.
[0040]
Specifically, the flatness of the metal frame is poor compared to the contact glass, and if there are protrusions or the like on the support part of the metal frame, when the contact glass is impacted (when an original is placed or an image reading device) When the ADF 6 is closed on the upper surface of the contact glass 1), the projections may come into contact with the contact glass and damage the contact glass.
[0041]
For this reason, it is possible to prevent the first contact glass 2 from being damaged by causing the grounding member 31 to function as a buffer material.
[0042]
Incidentally, as a buffer material for the first contact glass 2, a spacer such as rubber or resin may be interposed between the first contact glass 2 and the metal frame 32. In this case, the cost increases. In this embodiment, since the grounding member can also be used as a cushioning material, it is advantageous in terms of cost and removal of static electricity compared to a simple spacer such as rubber or resin.
[0043]
Furthermore, if the grounding member 31 is attached to the first contact glass 2 that has been subjected to the conductive treatment before the first contact glass 2 is incorporated into the image reading apparatus 1, the contact glass that has been subjected to the conductive treatment and Contact glass that has not been subjected to a conductive treatment can be easily distinguished.
[0044]
In the present embodiment, the metal frame 31 is flat. However, as shown in FIG. 4, a step is provided on the support portion 41 a of the metal frame 41, and although not shown in detail, the support portion 41 is connected to the first contact glass. You may provide in the metal frame 41 part corresponding to two four corners.
[0045]
In this way, the first contact glass 2 can be supported by only the four corners of the metal frame 41 even if the flatness of the entire metal frame 41 is poor. Can be installed with accuracy.
[0046]
5 and 6 are views showing a second embodiment of the image reading apparatus according to the present invention. In the present embodiment, only the configuration of the grounding member is different from that of the first embodiment, and only the portions different from the first embodiment will be described.
[0047]
In the present embodiment, as shown in FIG. 5, the grounding member 51 protrudes from the bottom plate 51a and both end portions of the bottom plate 51a, abuts against the upper and lower surfaces of the first contact glass 2, and in the protruding state in the free state. Is composed of a pair of side plates 51b and 51c formed to be smaller than the thickness of the first contact glass 2, and with respect to the side plate 51b in contact with the upper surface of the first contact glass 2 to which the conductive coating 2a is applied. The extending direction length of the side plate 51c that contacts the other surface of the first contact glass 2 is long.
[0048]
For this reason, when the grounding member 51 is attached to the end of the first contact glass 2, the long side plate 51c is slid to the end of the first contact glass 2 as shown in FIG. By rotating, the grounding member 31 can be easily attached to the first contact glass 2.
[0049]
Further, since the long side plate 51c is in close contact with the lower surface of the first contact glass 2 in a wide area, the grounding member 51 does not float from the contact glass, and the first contact glass 2 is supported by the support member 32a of the metal frame 32. It is possible to prevent the accuracy in the thickness direction of the first contact glass 2 from being lowered when it is attached to.
[0050]
7 and 8 are views showing a third embodiment of the image reading apparatus according to the present invention, and only the parts different from the first embodiment will be described.
[0051]
In FIG. 7, the grounding member 61 protrudes from the bottom plate 62 and both ends of the bottom plate 62, contacts the upper and lower surfaces of the first contact glass 2, and is a plate of the first contact glass 2 at the front end in the protruding direction in a free state. It is composed of a pair of side plates 63 and 64 formed smaller than the thickness, and tapers 63a and 63b are formed at both ends in the width direction of the side plate 63 that abuts the upper surface of the first contact glass 2 to which the conductive coating 2a is applied. Is formed. The taper may be formed only at one end in the width direction of the side plate 63.
[0052]
In this way, as shown in FIG. 8, when the side plate 64 is brought into contact with the corner of the first contact glass 2 and the grounding member 61 is rotated in this state, the side plate on which the tapers 63a and 63a are formed. Since 63 is attached to the first contact glass 2 along the taper 63a, the grounding member 61 can be attached more easily to the first contact glass 2.
[0053]
Of course, the ground members 51 and 61 of the second and third embodiments are also applied to the second contact glass 3.
[0054]
【The invention's effect】
According to the present invention, the grounding member is made of a flexible metal member, and in the free state, the gap at the tip in the protruding direction is formed smaller than the thickness of the contact glass. Can be installed on. In addition, the grounding member can be brought into close contact with the contact glass after attachment, and the contact glass can be reliably grounded to the metal frame via the grounding member.
[0055]
In addition, since the grounding member is flexible, it can be easily removed from the contact glass, the work of separating and discarding the contact glass and the grounding member can be simplified, and handling during recycling is also possible. It can be done easily.
[0056]
In addition, since the contact glass is attached to the support portion of the metal frame via the grounding member, the grounding member can function as a cushioning material, and the contact glass is contacted as compared with the contact glass attached directly to the support portion of the metal frame. It is possible to prevent the glass from being damaged by an impact or the like.
[0057]
Furthermore, before the contact glass is incorporated into the image reading apparatus, if the grounding member is attached to the contact glass that has been subjected to the conductive treatment, the contact glass that has been subjected to the conductive treatment and the contact that has not been subjected to the conductive treatment are used. Glass can be easily distinguished.
[0058]
In addition, according to the present invention, since the length of the side plate in contact with the other surface of the contact glass is made longer than the side plate in contact with the one surface of the contact glass that has been subjected to the conductive treatment, The grounding member can be easily attached to the contact glass by rotating the grounding member so that the long side plate is slid to the end of the contact glass.
[0059]
In addition, since the long side plate adheres to the other surface of the contact glass in a wide area, the grounding member does not float from the contact glass, and when the contact glass is attached to the support member of the metal frame, It is possible to prevent the accuracy in the thickness direction from being lowered.
[0060]
In addition, according to the present invention, since the taper is formed on at least one of the side plates in the width direction that contacts one surface of the contact glass, the side plate not formed with the taper is brought into contact with the corner portion of the contact glass and grounded in this state. When the member is rotated, the side plate on which the taper is formed can be attached to the contact glass along the taper, and the grounding member can be more easily attached to the contact glass.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a first embodiment of an image reading apparatus according to the present invention, and is a diagram illustrating a main part of the image reading apparatus.
FIG. 2 is a view showing a state in which the first contact glass of the first embodiment is attached to a metal frame via a grounding member.
3A is a perspective view of a grounding member according to the first embodiment, and FIG. 3B is a side view of the grounding member.
FIG. 4 is a view showing a state in which the first contact glass of the first embodiment is attached to a metal frame of another shape via a grounding member.
FIGS. 5A and 5B are diagrams showing a second embodiment of the image reading apparatus according to the present invention, in which FIG. 5A is a perspective view of a grounding member, and FIG. It is.
FIG. 6 is a view showing a state in which the ground member of the second embodiment is attached to the contact glass.
7A and 7B are diagrams illustrating an image reading apparatus according to a third embodiment of the invention, in which FIG. 7A is a perspective view of a grounding member, and FIG. 7B is a side view of the grounding member.
FIG. 8 is a view showing a state in which a ground member of a third embodiment is attached to contact glass.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Image reader 2 1st contact glass (contact glass)
2a Conductive coating 3 Second contact glass (contact glass)
4a Exposure lamp (scanning optical system)
4b, 4c, 4d Mirror 4e Lens (scanning optical system)
4f CCD (scanning optical system)
31, 51, 61 Grounding member
31a 51a, 62 Bottom plate
31b, 31c, 51b, 51c, 63, 64 Side plate
32, 41 metal frame
32a, 41a support part
63a, 63b taper

Claims (2)

In an image reading apparatus equipped with a contact glass that can be mounted facing the scanning optical system and subjected to a conductive treatment on one surface that comes into contact with a document,
A grounding member made of a flexible metal member having a substantially U-shaped cross section attached to the end portion of the contact glass is provided,
The grounding member protrudes from the bottom plate and both end portions of the bottom plate, sandwiches one surface and the other surface of the contact glass, and in a free state, the gap in the protruding direction tip is formed smaller than the plate thickness of the contact glass. A pair of side plates, and a taper is formed on at least one of the pair of side plates in the width direction of the side plate contacting one surface of the contact glass,
The image reading apparatus, wherein the contact glass is attached to a support portion of a metal frame via the ground member.   The said grounding member has the protrusion direction length of the side plate which contact | abuts the other surface of contact glass with respect to the side plate which contact | abuts one surface of the contact glass in which the said electroconductive process was performed, It is characterized by the above-mentioned. Image reading device.

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