JPH09288319A - Original cover used for image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize leakage of a light source at the time of reading a thick original such as a book and a magazine by providing an original pressing plate attaching mechanism which supports an original pressing plate attached to be freely opened and closed, and to make the original pressing plate vertically movable with respect to a device main body. SOLUTION: This image reader is provided with the original pressing plate 103 for allowing the placed original 102 to closely contact to an original platen 101, an original pressing plate shaft 104 for opening/closing the original pressing plate 103 and a hole 107 for making the original pressing plate shaft 104 vertically movable. When the original 102 is thick, the original pressing plate shaft 104 is moved upward in the hole 107 and the original pressing plate 103 is closed. Therefore, the original pressing plate 103 can be closed in parallel with the original 102, so that the original 102 can be brought into close contact with the original platen 101 in parallel, and the original is prevented from being deviated. Since the original pressing plate 103 can be closed in parallel with the original 102, the leakage from the light source at the time of reading the original 102 can be minimized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus for fixing and closely adhering a document placed on a document table by using a pressure plate, and more specifically, it is possible to move the pressure plate in the vertical direction, The present invention relates to an image reading device capable of appropriately reading a book document such as a magazine.

[0002]

2. Description of the Related Art Thick manuscripts such as books and magazines (book manuscripts)
As a conventional image reading device for reading the image, Japanese Patent Application Laid-Open No. 2-2
Japanese Patent No. 26138 discloses "Copier".
When reading a thick original, the "copying machine" temporarily presses the original by using an original pressing belt provided on the original table in advance. By temporarily pressing the original, You can scan thick originals without shifting them.

[0003]

However, according to Japanese Unexamined Patent Publication No. 2-226138, although the original is temporarily pressed to prevent the thick original from slipping, the pressure plate 701 is closed as shown in FIG. In this case, the pressure plate shaft 7 that can be opened and closed
The platen 701 hits the original 703 at a point close to 02 (point D).
There was a problem that the light was leaked when reading because it was tilted. FIG. 7 is an explanatory diagram showing the problems of the conventional image reading apparatus.

Further, since the pressure plate 701 is inclined, a force is applied diagonally to the original 703 at the point A, so that the original 703 may be displaced.

The present invention has been made in view of the above, and it is an object of the present invention to avoid the occurrence of document misalignment due to a pressure plate when a thick document such as a book or magazine is read.

Further, the present invention has been made in view of the above, and it is an object of the present invention to minimize the leakage of a light source when reading a thick original such as a book or a magazine.

[0007]

In order to achieve the above object, the image reading apparatus according to claim 1 uses a pressure plate,
In an image reading apparatus for fixing and closely adhering a document placed on a document table, a pressure plate mounting mechanism for mounting the pressure plate on the apparatus body so as to be openable and closable and for supporting the pressure plate vertically movable with respect to the apparatus body is provided. Be prepared.

In the image reading apparatus according to the second aspect, the pressure plate attachment mechanism supports the pressure plate so as to be vertically movable in a stepless manner or in a plurality of steps.

Further, in the image reading apparatus according to the third aspect, the pressure plate mounting mechanism supports the pressure plate so as to be freely movable in the vertical direction, and the thickness of the document placed on the document table is adjusted. Accordingly, the pressure plate is stopped.

Further, in the image reading apparatus according to the fourth aspect, the pressure plate attaching mechanism includes a pressure plate fixing means for fixing the pressure plate by prohibiting the vertical movement of the pressure plate.

According to a fifth aspect of the present invention, in the image reading apparatus, the pressure plate is a part of an ADF (automatic document feeder), the ADF has the pressure plate closed, and the pressure plate attachment mechanism has a vertical direction. It can only be used when it is fixed in the lowest position.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The pressure plate used in the image reading apparatus of the present invention will be described below in the order of [First Embodiment], [Second Embodiment], [Third Embodiment], and [Fourth Embodiment]. A detailed description will be given with reference to the drawings.

[First Embodiment] FIG. 1 is an explanatory diagram showing an image reading apparatus 100 according to a first embodiment. The image reading apparatus 100 includes a platen 101, a cover 102 for a document 102 placed on the platen 101, a pressure plate 103 for bringing the platen 101 into close contact with the platen 101, and a pressure plate shaft 1 for opening and closing the pressure plate 103.
04, an operation port 105 for operating the image reading apparatus 100, a paper ejection tray 106 that is a tray for ejecting copied recording paper, and a hole 107 that allows the pressure plate shaft 104 to move in the vertical direction. It is configured.

A pressure plate mounting mechanism for mounting the pressure plate 103 on the main body of the image reading apparatus 100 so as to be openable and closable by the pressure plate shaft 104 and the hole 107, and for supporting the pressure plate 103 so as to be vertically movable relative to the main body of the image reading apparatus 100. Has achieved the role of.

Next, the basic operation of the above configuration will be described. First, place the original 102 on the original table 101,
The original 102 is brought into close contact with the original table 101 by closing the pressure plate 103.

Next, a copy operation is executed by operating a print key (not shown) on the operation port 105, and the copied recording paper is ejected to the paper discharge tray 106.
Is discharged to

Next, in the above configuration and basic operation,
The operation of the first embodiment will be described with reference to the drawings. FIG.
FIG. 4 is an explanatory diagram showing a state where the pressure plate shaft 104 of the first embodiment is moved in the vertical direction. Document 10 shown in FIG.
When the original 102 such as 2a is thin, the pressure plate shaft 104 is lowered in the downward direction of the hole 107, and the pressure plate 103 is closed. Further, when the original 102 such as the original 102b shown in FIG. 2B is thick, the pressure plate shaft 104 is raised above the hole 107, and the pressure plate 1
Close 03.

As described above, according to the first embodiment, when the original 102 is thick (such as the original 102b shown in FIG. 2B), the pressure plate shaft 104 is raised in the upward direction of the hole 107 to move the pressure plate 103. Since the pressure plate 103 can be closed parallel to the original 102, the original 102 can be in close contact with the original table 101 in parallel, and
The platen 101 does not shift.

Further, since the pressure plate 103 can be closed parallel to the original 102, it is possible to minimize leakage of the light source when the original 102 is read.

[Second Embodiment] In the second embodiment, description will be given of a case where the pressure plate shaft 104 is moved in a plurality of stages in the vertical direction. Since the second embodiment is basically the same as the first embodiment, only different points will be described with reference to the drawings.

FIG. 3 is an explanatory view showing a state where the pressure plate shaft 104 of the second embodiment is moved in the vertical direction. For example,
As shown in FIG. 3A, the original 302 is slightly thick, the pressure plate shaft 104 moves vertically in two steps, and the pressure plate shaft 10 moves upward.
When 4 is moved, a large gap is generated at a point near the pressure plate shaft 104 (near the point A in the figure).

In the second embodiment, the pressure plate shaft 104 is moved in a plurality of stages in the vertical direction so as not to create the above-mentioned gap,
When the original 302 is slightly thick as shown in FIG. 3B, the pressure plate shaft 104 is adjusted in the vertical direction of the hole 107 according to the thickness of the original 302, and the pressure plate 103 is closed.

As described above, according to the second embodiment, when the original 302 is slightly thick as shown in FIG.
4 is positioned above the hole 107 in accordance with the thickness of the original 302 to close the pressure plate 103.
Since the document 3 can be closed in parallel with the document 302, the document 302 can be in close contact with the document table 101 in parallel and a large gap is not generated.

Further, since the pressure plate 103 is closed parallel to the original 302 and no large gap is formed, it is possible to minimize the leakage of the light source when reading the original 302.

[Third Embodiment] In the third embodiment, a pressure plate 1 is used.
It will be described that the shaft variation mode 401 as the pressure plate fixing means for prohibiting and fixing the vertical movement of 03 is provided. Since the third embodiment is basically the same as the second embodiment, only different points will be described with reference to the drawings.

The axis variation mode 401 is a mode in which the vertical movement of the pressure plate shaft 104 can be fixed or freely switched. Switching of the axis variation mode 401 including the pressure plate shaft 104 will be described with reference to FIGS. 4 and 5.

4 and 5 are explanatory views showing the switching operation of the axis variation mode 401. Axis fluctuation mode 40
Reference numeral 1 denotes a lever, which is a shaft fixing mode in which the pressure plate shaft 104 is fixed when the lever is tilted to the left side in FIGS. 4 and 5,
In addition, the pressure plate shaft 104 when tilted to the right in FIGS.
Is the free axis mode.

First, as shown in FIG. 4, the axis variation mode 4
01 is tilted from left to right in the drawing, the axis fixed mode is switched to the axis free mode, the pressure plate 103 is opened, and the document 402 is placed on the document table 101.

Next, as shown in FIG. 5, the pressure plate shaft 104 in the axial free mode moves upward with the point B as a fulcrum and the point C as a force point, and the pressure plate 103 is closed. In this state, the axis variation mode 401 is operated to switch from the axis free mode to the axis fixed mode.

It should be noted that the axis variation mode 401 is used for the pressure plate shaft 10
Of course, any configuration may be used as long as 4 can be fixed or switched.

As described above, according to the third embodiment, the axis variation mode 401 is operated so that the pressure plate shaft 104 can be switched between the axis fixed mode and the axis free mode. It is not necessary to adjust the pressure plate shaft 104 every time when copying.

[Embodiment 4] Embodiment 4 is a pressure plate 1.
03 is a part of ADF (not shown). Since the fourth embodiment has basically the same configuration as the third embodiment, only different points will be described with reference to the drawings.

FIG. 6 shows an image reading apparatus 10 according to the fourth embodiment.
It is a flow chart which shows operation of 0. First, when a print key (not shown) of the operation port 105 is pressed (S601), the ADF is set (A
It is determined whether or not it is the DF mode (S602), and when it is determined that the ADF mode is not set, step S605 is executed.

On the other hand, when it is determined that the ADF mode is set, it is determined whether the pressure plate shaft 104 is at the lowest position and the axis variation mode 401 is the axis fixing mode (S60).
3) If the result is negative, the mode change of the pressure plate shaft 104 is displayed on the display unit (not shown) provided in the operation port 105 (S604), and the process ends.

If the determination is affirmative in step S603, copying is started (S605), and the process ends.

As described above, according to the fourth embodiment, the pressure plate 103 is a part of the ADF, and the ADF includes the pressure plate 103.
Is closed, and the platen shaft 104 can be used only when it is in the shaft fixing mode at the lowermost position in the vertical direction, that is, at the lowermost position of the hole 107.

[0037]

As described above, according to the image reading apparatus of the present invention (Claim 1), in the image reading apparatus for fixing and closely adhering the original placed on the original table using the pressure plate, Since the pressure plate is attached to the main body of the device so that it can be opened and closed, and the pressure plate attachment mechanism that supports the pressure plate so as to be movable in the vertical direction with respect to the main body of the device, thick originals such as books and magazines are placed parallel to the original plate. Since they can be fixed and brought into close contact with each other, when a thick document such as a book or a magazine is read, it is possible to avoid the document displacement due to the pressure plate.

An image reading apparatus of the present invention (claim 2)
According to the above, since the pressure plate attachment mechanism supports the pressure plate so as to be vertically movable in a stepless manner or in a plurality of steps, a book,
For manuscripts of any thickness, such as magazines,
Since they can be fixed and closely contacted in parallel, it is possible to avoid the occurrence of document misalignment due to the pressure plate when reading thick documents such as books and magazines.

Further, since the original can be fixed and adhered in parallel to the original table, it is possible to minimize the leakage of the light source when reading a thick original such as a book or a magazine.

An image reading device of the present invention (claim 3)
According to the above, the pressure plate attachment mechanism supports the pressure plate so as to be freely movable in the vertical direction, and stops the pressure plate according to the thickness of the document placed on the document table.
For manuscripts of any thickness, such as magazines,
Since they can be fixed and closely contacted in parallel, it is possible to avoid the occurrence of document misalignment due to the pressure plate when reading thick documents such as books and magazines.

Further, since the original can be fixed and adhered to the original table in parallel, it is possible to minimize the leakage of the light source when reading a thick original such as a book or a magazine.

An image reading device of the present invention (claim 4)
According to the document, since the pressure plate attaching mechanism includes the pressure plate fixing means for prohibiting the vertical movement of the pressure plate and fixing the pressure plate, a manuscript can be placed on the manuscript table regardless of the thickness of a book, a magazine or the like. Since they can be fixed and closely attached in parallel, it is possible to avoid the occurrence of document misalignment due to the pressure plate when reading thick documents such as books and magazines, and to read the same document often. It is not necessary to adjust the pressure plate attachment mechanism.

An image reading apparatus of the present invention (Claim 5)
And said platen is part of an ADF,
Can be used only when the pressure plate is closed and the pressure plate attachment mechanism is fixed to the lowermost position in the vertical direction. Therefore, even if the pressure plate attachment mechanism is vertically movable, the ADF The original can be read.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an image reading apparatus according to a first embodiment.

FIG. 2 is an explanatory diagram showing a state where the pressure plate shaft of the first embodiment is moved in the vertical direction.

FIG. 3 is an explanatory diagram showing a state in which a pressure plate shaft according to the second embodiment is moved in a vertical direction.

FIG. 4 is an explanatory diagram showing a switching operation of axis variation modes.

FIG. 5 is an explanatory diagram showing a switching operation of axis variation modes.

FIG. 6 is a flowchart showing the operation of the image reading apparatus according to the fourth embodiment.

FIG. 7 is an explanatory diagram showing a problem of the conventional image reading apparatus.

[Explanation of symbols]

 100 image reading device 101 document table 102, 102a, 102b, 302, 402 document 103 pressure plate 104 pressure plate shaft 105 operation port 106 paper ejection tray 107 hole 401 axis variation mode

Claims (5)

[Claims] 1. An image reading apparatus for fixing and closely adhering a document placed on a document table using a pressure plate, wherein the pressure plate is attached to the device body so as to be openable and closable, and the pressure plate is arranged in a vertical direction relative to the device body. An image reading apparatus comprising a pressure plate attachment mechanism that movably supports the image reading apparatus. 2. The image reading apparatus according to claim 1,
An image reading apparatus, wherein the pressure plate attachment mechanism supports the pressure plate so as to be vertically movable in a stepless manner or in a plurality of steps. 3. The image reading device according to claim 1,
The image reading device, wherein the pressure plate attachment mechanism supports the pressure plate so as to be freely movable in the vertical direction, and stops the pressure plate according to the thickness of the document placed on the document table. . 4. The image reading apparatus according to claim 1, 2, or 3, wherein the pressure plate attachment mechanism includes a pressure plate fixing means for prohibiting and fixing the vertical movement of the pressure plate. Image reading device. 5. The image reading apparatus according to claim 1, 2, 3 or 4, wherein the pressure plate is a part of an ADF (automatic document feeder), and the ADF has the pressure plate closed and An image reading apparatus, which can be used only when the pressure plate attachment mechanism is fixed to the lowermost position in the vertical direction.