JP2004077523A - Image reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve working efficiency required in maintenance and to improve positional accuracy required in assembling a scale. <P>SOLUTION: The image reader is structured so that the scale 16 having a structure that the scale can be adhered to a contact glass for a book type original 15a and capable of positioning one side of an original placed on the contact glass 15a is arranged in a gap between the contact glass 15a and a contact glass for a transported original 15b arranged in parallel. Thus, troublesomeness in the case of handling the contact glass 15a or the like in the maintenance is eliminated and positioning in attaching the scale 16 or the like is easily performed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image reading apparatus that optically reads an image formed on a paper surface and converts the image into a digitized signal.
[0002]
[Prior art]
2. Description of the Related Art An image reading device used as an input device of a copying machine or the like utilizing an electrophotographic process reads an image by forming reflected light upon exposing a printing surface of a document on a CCD, and outputs the image to a CCD output. It is a device that outputs a digitized signal based on the signal.
[0003]
FIG. 10 shows a conventional example of an image reading apparatus. FIG. 10 is a vertical sectional side view showing the structure of the image reading apparatus used in the copying machine.
[0004]
The image reading apparatus 101 includes an image reading unit 102 and an automatic document feeder (ADF) 103.
[0005]
The image reading unit 102 includes a transport document reading unit 104, a book document reading unit 105, a scale 106, a frame 107, and an optical member 108.
[0006]
Further, the automatic document feeder 103 includes a transport tray 103b and a paper discharge tray 103c at both ends of the transport path 103a.
[0007]
The transport original reading unit 104 and the book original reading unit 105 are provided with a transport original contact glass 104a and a book original contact glass 105a at the upper part. The transport original contact glass 104a and the book original contact glass 105a are arranged in parallel, and a gap is provided between them.
[0008]
The scale 106 is a plate-shaped member disposed so as to straddle the contact glass 104a for the conveyed document and the contact glass 105a for the book document. Further, a portion in contact with the transport original contact glass 104a constitutes a part of the transport path 103a of the ADF 103, and a hole 106a is formed in that portion. Further, a portion in contact with the book original contact glass 105a is adhered to the book original contact glass 105a by an adhesive member (not shown).
[0009]
Here, when the original is placed on the book original contact glass 105a, the position where the original is placed is determined by abutting one side of the original against the end face of the scale 106 adhered to the book original contact glass 105a. This position is used as a reference for faithfully reproducing the position and the like of an image formed on a document when copying is performed by a copying machine or the like. Therefore, when performing image formation such as copying, as a means for improving reproducibility, improving the accuracy of the installation position of the scale 106 can be raised.
[0010]
As a device for improving the installation position accuracy, Japanese Utility Model Publication No. 7-45077 discloses a method in which a groove is formed in one place of a contact glass for a book document, a leg is formed on a scale, and these are fitted to each other to thereby adjust the position accuracy of the scale. A device for improving the position accuracy of an image formed on copy paper has been disclosed.
[0011]
[Problems to be solved by the invention]
The scale 106, which straddles the book original contact glass 105a and the conveyed original contact glass 104a and has a shape that forms a part of the conveyance path on the conveyed original contact glass 104a, is connected to the book original contact glass 105a. The contacting part is adhered by an adhesive member. Therefore, when removing the book original contact glass 105a during maintenance or the like, the scale 106 is also removed together with the book original contact glass 105a. At this time, if the scale 106 has a structure straddling the conveyed document contact glass 104a, when removing the book document contact glass 105a and the scale 106, the scale 106 is disposed around the conveyed document contact glass 104a and the periphery thereof. There is a problem that it is necessary to prevent contact with the parts and the like, which makes the handling of the book original contact glass 105a and the like complicated.
[0012]
Next, Japanese Utility Model Publication No. 7-45077 discloses a technique for improving the positional accuracy of the scale. However, this technique has a problem that it is necessary to form a groove on the surface of the book original contact glass, and the production efficiency is low.
[0013]
An object of the present invention is to improve detachability and work efficiency of each member during maintenance.
[0014]
An object of the present invention is to improve the reading accuracy of a document by improving the positional accuracy when attaching a scale.
[0015]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a book document contact glass on which a document is placed on an upper surface, and a transport path in which the document is transported by an automatic document feeder, which is arranged in parallel with the book document contact glass with a gap therebetween. A contact glass for the transport original positioned so as to be in contact with, and a structure arranged in the gap and capable of adhering to the contact glass for the book original, and on the upper surface, continuously transported to the surface of the contact glass for the transport original. A scale having a document guide surface positioned to form a part of a path and an extension member for positioning one side of the document placed on the book document contact glass;
[0016]
Therefore, the scale is disposed in the gap between the contact glass for the conveyed document and the contact glass for the book manuscript, and the document guide surface formed on the upper surface of the scale is continuous with the surface of the contact glass for the conveyed document to form one part of the conveyance path. And the scale is provided with an extension member having a shape for positioning the original placed on the book original contact glass, so that a function having a transport path for the original to be transported and a positioning function are provided. Has the same function as the conventional example. In addition, since the scale has a structure arranged in the gap between the contact glass for the conveyed document and the contact glass for the book document, it is possible to reduce the size of the shape, so that the book document contact glass and the scale can be used during maintenance or the like. It is not necessary to prevent the scale from coming into contact with the conveyed document contact glass and its surrounding parts when attaching and detaching the document, and it is possible to eliminate the complexity of handling the book document contact glass and the like.
[0017]
The invention according to claim 2 is the invention according to claim 1, wherein a positioning member that positions the scale with respect to the book glass contact glass, a striking member that strikes and positions the book document contact glass, And positioning the scale adhered to the book original contact glass by abutting and positioning the book original contact glass against the abutting member.
[0018]
Therefore, a positioning member for positioning the scale with respect to the book original contact glass, and a butting member for positioning the book original contact glass, and by bonding the scale and the book original contact glass, The scale can be positioned via the book original contact glass.
[0019]
According to a third aspect of the present invention, in the first aspect of the invention, a pair of legs extending downward is formed on both ends of the scale in the main scanning direction to allow fitting with the legs. And a frame in which a pair of holes for positioning the fitted scale is formed.
[0020]
Therefore, a pair of legs extending downward in the main scanning direction are formed on the scale on both ends in the main scanning direction, and a hole is provided in the frame to allow fitting with the legs. It is possible to directly position the scale with respect to the scale.
[0021]
According to a fourth aspect of the present invention, in the third aspect of the invention, the one of the holes provided in the frame rotates the scale with the leg side fitted into the hole as a fulcrum. In the event that it does not interfere with its legs when it does.
[0022]
Therefore, when removing the scale at the time of maintenance, when the scale is rotated with one leg as a fulcrum, the shape of the hole that fits with the leg has a play that does not interfere with the rotating leg. Therefore, at the time of maintenance or the like, it is possible to easily perform operations such as removal of the book original contact glass and scale.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. In the first embodiment of the present invention, an example of application to a copying machine will be described as an example of an electronic apparatus including an image reading device.
[0024]
FIG. 1 is a schematic diagram illustrating a configuration of a copier including an image reading device according to a first embodiment. FIG. 2 is a vertical side view illustrating a configuration of the image reading device according to the embodiment. 3 is an exploded perspective view showing the arrangement of members around the scale in the image reading apparatus shown in FIG. 2, and FIG. 4 is a positional relationship between members around the scale in the image reading apparatus shown in FIG. FIG.
[0025]
The copying machine 1 according to the present embodiment includes an image reading device 2, an image forming unit 3, and a paper feeding unit 4.
[0026]
The image forming unit 3 includes a photoconductor 5 as a main element, and a charging device 6, an exposure device 7, a developing device 8, a transfer device 9, and a cleaning device 10 are arranged around the photoconductor 5 in the order of the electrophotographic process. The paper supply unit 4 includes a paper supply tray 11 and a paper passage path 12, and a fixing device 13 is disposed in the paper passage path 12.
[0027]
The image reading device 2 includes an automatic document feeder (hereinafter, simply referred to as an ADF 14), a contact glass 15, a scale 16, an optical member 17, and a frame 18.
[0028]
The ADF 14 includes a transport tray 14b on which a document to be transported along the transport path 14a is previously placed, a plurality of transport rollers 14c for transporting the document in the transport path 14a, and a discharge tray from which the transported document is discharged. 14d. The document set on the transport tray 14b is transported along the transport path 14a by the transport rollers 14c, and is discharged to the discharge tray 14d.
[0029]
The contact glass 15 includes a book original contact glass 15a on which an untransportable original such as a book original is placed, and a transport original contact glass 15b positioned so as to be in contact with a part of the transport path 14a. The book original contact glass 15a and the transport original contact glass 15b are arranged in parallel with a gap therebetween.
[0030]
The scale 16 is disposed in a gap opened between the book original contact glass 15a and the transport original contact glass 15b, and has an original guide surface 16a that forms a part of the transport path 14a formed on the upper surface. On the side, an extension member 16b is provided, which is mounted above the book original contact glass 15a and positions one side of the placed original. When the scale 16 is arranged in the above-described gap, the document guide surface 16a is positioned so as to form a part of the transport path continuously with the surface of the transport document contact glass 15b.
[0031]
The extension member 16b has a fitting space 16c below the book glass contact glass 16a, and the fitting space 16c has a positioning surface 16d for abutting and positioning the book document contact glass 15a. Having. An adhesive member such as a double-sided tape (not shown) is provided on a surface 16e of the extension member 16b which is in contact with the surface of the book original contact glass 15a, so that the book original contact glass 15a and the scale 16 can be adhered. It has a simple structure.
[0032]
The end face 16f of the extension member 16b positions the document by abutting one side of the document placed on the book document contact glass 15a against the end face 16f of the extension member 16b.
[0033]
The optical member 17 includes a light source 17a, a plurality of mirrors 17b, a lens 17c, and a CCD 17d. These members are all disposed below the contact glass 15b for the transport original and the contact glass 15a for the book original. The light source 17a exposes the printing surface of the document and the like, and forms the reflected light obtained at that time on the CCD 17d by the mirror 17b and the lens 17c. The CCD 17d outputs a digital signal based on the formed image.
[0034]
On the frame 18, a book original contact glass 15a, a conveyed original contact glass 15b, a scale 16, an optical member 17, and the like are arranged, and the ADF 14 is provided above the contact glass 15a. One side of the frame 18 and the ADF 14 are attached by a member such as a hinge, and the ADF 14 is rotated in a direction perpendicular to the upper surface of the frame 18 around a point attached by the member such as a hinge. Has a flexible structure. An abutment member 18a is provided on the upper portion of the frame 18 along the main scanning direction. When the book original contact glass 15a is attached to the frame 18 during assembly or maintenance, the book original contact glass 15a is provided. Of the book original contact glass 15a with respect to the frame 18 by abutting the abutment member 18 against the abutment member 18a.
[0035]
In such a configuration, the book document contact glass 15a and the scale 16 are arranged with respect to the frame 18 as shown in FIGS.
[0036]
In other words, the book document contact glass 15a is positioned by abutting against the abutting member 18a provided on the frame 18. Next, the scale 16 is placed on the upper portion of the side surface of the book document contact glass 15a abutted against the abutting member 18a. At this time, the positioning surface 16d provided on the scale 16 and the side surface portion 15b of the book document contact glass 15a are abutted and placed, and the scale 16 and the book document contact glass 15a are separated using an adhesive member. Glue.
[0037]
Therefore, the book original contact glass 15a is abutted against the abutting member 18a provided on the frame 18 to position the book original contact glass 15a, and the scale 16 is positioned relative to the book original contact glass 15a. By arranging the side surface 15b of the contact glass 15a so as to be in contact with the positioning surface 16d formed on the scale 16, positioning of the scale 16 with respect to the frame 18 is realized.
[0038]
When the scale 16 is to be detached during maintenance, the scale 16 may be detached together with the book original contact glass 15a adhered thereto. At this time, since the scale 16 is miniaturized so that it can be arranged in a gap opened between the book original contact glass 15a and the transport original contact glass 15b, the removal of the book original contact glass 15a during maintenance is performed. In addition, it is possible to easily perform the mounting and the mounting, and to eliminate the troublesome handling of the book original contact glass 15a and the scale 16.
[0039]
In the present embodiment, the method of installing the scale 16 after placing the book original contact glass 15a on the frame 18 has been described, but the book original contact glass 15a and the scale 16 are bonded in advance, After that, the same effect can be obtained even if it is placed on the frame 18.
[0040]
Further, in the present embodiment, the scale 16 is bonded using an adhesive member such as a double-sided tape. However, the scale 16 is sandwiched between the conveyed original contact glass 15b and the book original contact glass 15a. A similar effect can be obtained as a structure.
[0041]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is an exploded perspective view showing the arrangement of members around the scale and the like in the second embodiment of the image reading apparatus shown in FIG. 2, and FIG. 6 is an image reading apparatus shown in FIG. It is the elements on larger scale which detailed the positional relationship of each member around a scale.
[0042]
Note that, in the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0043]
In this embodiment, the scale 16 provided with the document guide surface 16a and the extension member 16b is provided with a pair of legs 16g extending downward at both end surfaces in the main scanning direction. The frame 18 on which members such as the book original contact glass 15a necessary for image reading are provided is formed with a pair of holes 18b that allow fitting with the legs 16g.
[0044]
In such a configuration, the book document contact glass 15a and the scale 16 are arranged with respect to the frame 18 as shown in FIGS.
[0045]
That is, when attaching the book original contact glass 15a during assembly or maintenance, the book original contact glass 15a is positioned against the abutment member 18a provided on the frame 18. Next, the pair of holes 18b formed in the frame 18 and the pair of legs 16g formed in the scale 16 are fitted to fix the scale 16 to the frame 18. At this time, the extension member 16b of the scale 16 and the book original contact glass 15a are adhered by an adhesive member.
[0046]
Accordingly, the scale 16 and the frame 18 are formed with a fitting structure for fitting each other, and by fitting the scale 16 and the frame 18, the positioning of the scale 16 with respect to the frame 18 can be performed directly. It is possible to improve the positioning accuracy when attaching the scale 16 to the frame 18.
[0047]
Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 7 is an exploded perspective view showing the arrangement of members around the scale and the like in the third embodiment of the image reading apparatus shown in FIG. 2, and FIG. 8 is an image reading apparatus shown in FIG. It is the elements on larger scale which detailed the positional relationship of each member around a scale.
[0048]
In the present embodiment, the left hole 18c formed in the frame 18 in FIG. 7 has the leg 16h when the scale 16 is rotated with the leg 16h fitted into the hole 18c as a fulcrum. In the direction perpendicular to the sub-scanning direction. In the present embodiment, when the scale 16 is rotated and lifted with the leg 16h shown in FIG. 7 as a fulcrum, the play fits with the hole 18c of the frame 18 and does not interfere with the rotating leg 16h. The hole 18c has a groove shape.
[0049]
If the hole 18c has a play in a direction orthogonal to the sub-scanning direction, the reason why the leg 16g of the scale 16 and the hole 18b of the frame 18 can be easily removed without interference will be described. 9 will be described. FIG. 9 is an arrow view between a and a in FIG.
[0050]
First, assuming that the hole is provided with substantially the same size as the outer diameter of the leg 16h, there is almost no gap between the hole and the leg 16h. Cannot rotate. Therefore, it is necessary to remove the scale 16 while maintaining the state in which the leg 16h and the hole are orthogonal to each other, and it takes time to remove the scale 16.
[0051]
On the other hand, when one of the holes 18c has a groove shape as shown in FIG. 9, when the scale 16 rotates in the direction of the arrow X and the leg 16h rotates accordingly, the leg 16h It moves along the movement locus indicated by the dotted line in FIG. 9, and since the hole diameter of the hole 18b is larger than the movement locus at that time, the leg 16h and the hole 18c do not interfere with each other. That is, when one leg 16g of the scale 16 is lifted to the upper right, the position of the other leg 16h can be arbitrarily changed according to the height of the leg 16g being lifted to the upper right.
[0052]
Therefore, in the case of having the structure as shown in FIG. 9, when removing the scale 16 from the frame 18, one leg 16 g that fits into one hole 18 b of the frame 18 is pulled out, and the state of the scale 16 is changed. By rotating in the direction of the arrow X, it becomes possible to remove the frame 18 in a state where the frame 18 is inclined.
[0053]
As described above, by using the present embodiment, even when the scale 16 is lifted obliquely in the direction of the arrow X, the leg 16h of the scale 16 and the hole 18c of the frame 18 interfere with each other. This makes it possible to remove the scale 16 and the like smoothly.
[0054]
In the present embodiment, the shape of the hole 18c is a groove. However, if the scale 16 can be rotated with the leg 16h as a fulcrum fitted with the hole 18c, the shape of the groove is not limited. The same effect can be obtained without doing so.
[0055]
Further, in each of the above-described embodiments, an example in which the electronic apparatus is used in a copying machine is described. However, the present invention is not limited to this. The effect can be obtained.
[0056]
【The invention's effect】
According to the first aspect of the present invention, the scale is disposed in the gap between the contact glass for the transport document and the contact glass for the book document, and the document guide surface formed on the upper surface of the scale is the surface of the contact glass for the transport document. And a scale is provided with an extending member having a shape for positioning the original placed on the book original contact glass. The function having a path and the positioning function have the same functions as those of the conventional example, and the scale has a structure arranged in a gap between the contact glass for the conveyed document and the contact glass for the book document. The scale can be transported when removing and attaching the book original contact glass and scale during maintenance, etc. It is not necessary to avoid contact with the original contact glass and its surrounding components, it becomes possible to eliminate the complexity of the handling of the contact glass for book original.
[0057]
According to the invention of claim 2, a positioning member for positioning the scale with respect to the book original contact glass, and a butting member for positioning the book original contact glass with respect to the frame, the scale and By bonding the book document contact glass, the scale can be positioned with respect to the frame via the book document contact glass.
[0058]
According to the third aspect of the present invention, the scale is formed with a pair of legs extending downward on both end surfaces in the main scanning direction, and has a hole that allows fitting with the legs. , It is possible to directly position the scale with respect to the frame.
[0059]
According to the invention as set forth in claim 4, when the scale is rotated with one leg as a fulcrum, a shape having a play which does not interfere with the shape of the hole fitted with the leg with the rotating leg. Therefore, at the time of maintenance or the like, operations such as removal of the book original contact glass and scale can be easily performed.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a configuration of a copier including an image reading apparatus according to an embodiment of the present invention.
FIG. 2 is a vertical sectional side view showing the configuration of the image reading apparatus according to the first embodiment of the present invention.
FIG. 3 is an exploded perspective view showing a positional relationship among a frame, a scale, and a book original contact glass of the image reading apparatus according to the first embodiment of the present invention.
FIG. 4 is a partially enlarged view illustrating a positional relationship among a frame, a scale, a contact glass for a conveyed document, and a contact glass for a book document in the image reading apparatus according to the first embodiment of the present invention.
FIG. 5 is an exploded perspective view illustrating a positional relationship among a frame, a scale, and a book original contact glass of the image reading apparatus according to the second embodiment of the present invention.
FIG. 6 is a partially enlarged view showing a positional relationship among a frame, a scale, a contact glass for a conveyed document, and a contact glass for a book document in the image reading apparatus according to the second embodiment of the present invention.
FIG. 7 is an exploded perspective view illustrating a positional relationship among a frame, a scale, and a book original contact glass of an image reading apparatus according to a third embodiment of the present invention.
FIG. 8 is a partially enlarged view showing a positional relationship among a frame, a scale, a contact glass for a conveyed document, and a contact glass for a book document in the image reading apparatus according to the third embodiment of the present invention.
FIG. 9 is a schematic diagram showing a positional relationship between a leg of a scale and a hole of a frame when the scale is removed in the third embodiment of the present invention.
FIG. 10 is a vertical sectional side view showing a configuration of an image reading apparatus shown as an example of the prior art of the present invention.
[Explanation of symbols]
2 Image reading device 14 Automatic document feeder (ADF)
14a Conveying path 15a Book original contact glass 15b Conveyed original contact glass 16 Scale 16a Document guide surface 16d Leg 18a Butting member 18b Hole

Claims (4)

A book original contact glass on which the original is placed,
A transport document contact glass, which is arranged in parallel with the book document contact glass with a gap therebetween, and is positioned to be in contact with a transport path on which the document is transported by the automatic document feeder,
A document guide surface disposed in the gap and having a structure capable of adhering to the book document contact glass, and positioned on the upper surface so as to form a part of a conveyance path continuously to the surface of the conveyance document contact glass. An image reading apparatus, comprising: a scale having an extension member for positioning one side of a document placed on the book document contact glass. A positioning member for positioning the scale with respect to the book original contact glass, and an abutting member for abutting and positioning the book original contact glass, comprising the book original contact glass and the abutting member. 2. The image reading apparatus according to claim 1, wherein the scale adhered to the book original contact glass is positioned by abutting positioning. A pair of legs extending downward are formed on both ends of the scale in the main scanning direction on the scale, and a pair of holes for positioning the fitted scale by allowing the scale to be fitted to the scale. The image reading apparatus according to claim 1, further comprising a frame formed with a frame. One of the holes provided in the frame has a play that does not interfere with the legs when the scale is rotated around the legs that fit into the holes as a fulcrum. Item 3. The image reading device according to Item 3.

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