JP6750940B2 - Image reader - Google Patents

Description

The present invention relates to an image reading device that reads an image formed on a document while conveying the document.

A technique is known in which an image reading device alternately switches the background color of a document between white and black. When the background color is black, the original size is automatically detected, the black background is used to correct the skewed original by recognizing the boundary between the original and the background, and when reading a thin original. Has prevented the show-through. On the other hand, by making the background part white, dust etc. adhering to the glass surface placed at the reading position is detected, vertical stripes appearing in the read image due to dust etc. are removed, and the white read data is corrected for the sensitivity of the light receiving element. It is used as reference data for (shading correction).

A conventional mechanism for switching the background color will be described with reference to FIG.

The cylindrical transparent platen roller 800 and the cylindrical background plate 801 are supported by the shaft 802 via bearings 803. The cylindrical transparent platen roller 800 is hermetically sealed by a lid 804 so that dust and dirt do not adhere to the cylindrical background plate 801. The cylindrical background plate 801 is fixed to the shaft 802, and is rotationally driven by a motor 806 via a gear 805 which is also fixed to the shaft 802. The background color of the read image can be switched by holding the cylindrical background plate 801 facing the original reading position so that the white part and the black part can be selected.

JP, 2004-320331, A

However, as described in Patent Document 1 above, when the motor for switching the background color is arranged on the side surface of the background plate, there is a problem that the width dimension of the device becomes large.

The present invention has been made in view of the above problems, and an object thereof is to provide a technique for reducing the size of an image reading apparatus.

In order to solve the above problems, the image reading device of the present invention is
An apparatus main body having a conveyance unit that conveys a document along a conveyance path ,
A sensor case mounted on the device main body along the front Ki搬 sending passage,
A reading sensor that is provided in the sensor case so as to be movable in the conveyance direction of the document, and reads one side of the document;
A background member having a sandwiching the conveyance path provided opposite to the reading sensor, the first background portion are arranged side by side in the transport direction and the second background portions,
And a sensor moving member for moving the reading sensor before Ki搬 feeding direction,
It said sensor moving member engages said reading sensor movably against before Symbol sensor case,
With respect to the sensor moving member, it has a drive source for transmitting a driving force from a side opposite to the reading sensor,
The sensor moving member is
When the document is moved in the width direction with respect to the transport direction, the read sensor is moved in the transport direction via a cam groove that engages with an engagement pin provided on the read sensor .
Further, the image reading device of the present invention is
An apparatus main body having a conveyance unit that conveys a document along a conveyance path,
A sensor case attached to the apparatus main body along the transport path,
A reading sensor that is provided in the sensor case so as to be movable in the conveyance direction of the document, and reads one side of the document;
A background member having a first background portion and a second background portion which are provided so as to face the reading sensor with the conveyance path interposed therebetween and are arranged side by side in the conveyance direction;
A sensor moving member for moving the reading sensor in the transport direction;
Equipped with
The sensor moving member is movably engaged with the reading sensor with respect to the sensor case,
A driving source that transmits a driving force to the sensor moving member from a side opposite to the reading sensor side;
The drive source transmits a drive force to the sensor moving member via a through hole provided in the apparatus body,
A protrusion extending toward the sensor case is provided around the through hole.

According to the present invention, since it is not necessary to provide a driving unit for switching the background on the side surface of the reading unit, the width dimension of the device can be reduced.

1 is a schematic diagram of an image reading apparatus according to an embodiment of the present invention. 2 is a block diagram of a control unit of the image reading apparatus in FIG. 1. FIG. 1 is a front view of an image reading apparatus according to an embodiment of the present invention. FIG. 6 is another front view of the image reading apparatus according to the embodiment of the present invention. FIG. 3 is a top view of the image reading apparatus according to the embodiment of the present invention. FIG. 6 is another top view of the image reading apparatus according to the embodiment of the present invention. 1 is a schematic sectional view of an image reading device according to an embodiment of the present invention. FIG. 3 is another schematic cross-sectional view of the image reading device according to the embodiment of the present invention. 1 is a side view of an image reading device according to an embodiment of the present invention. FIG. 3 is another side view of the image reading device according to the embodiment of the present invention. 1 is a perspective view of an image reading device according to an embodiment of the present invention. FIG. 6 is another perspective view of the image reading apparatus according to the embodiment of the present invention. 1 is a schematic cross-sectional view of an image reading lower unit of an image reading device according to an embodiment of the present invention. 1 is a schematic cross-sectional view of an image reading unit of an image reading device according to an embodiment of the present invention. FIG. 6 is another schematic cross-sectional view of the image reading lower unit of the image reading apparatus according to the embodiment of the present invention. FIG. 6 is another schematic cross-sectional view of the image reading lower unit of the image reading apparatus according to the embodiment of the present invention. FIG. 3 is a perspective view around the position detection sensor with the image reading lower unit of the image reading apparatus according to the embodiment of the present invention removed. 1 is a schematic cross-sectional view around a position detection sensor of an image reading device according to an embodiment of the present invention. FIG. 3 is a perspective view of a CIS drive unit of the image reading apparatus according to the embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a CIS drive unit of the image reading device according to the embodiment of the present invention. FIG. 3 is a schematic cross-sectional view around a CIS sliding motor of the image reading device according to the embodiment of the present invention. The schematic diagram of the conventional background switching mechanism.

FIG. 1 is a schematic diagram of an image reading apparatus A according to an embodiment of the present invention.

<Device configuration>
The image reading apparatus A is an apparatus that conveys one or a plurality of conveyance media S loaded on the mounting table 1 one by one into the apparatus via a route RT, reads the image, and discharges the image onto a discharge tray 2. The transport medium S to be read is, for example, an original such as OA paper, check, check, business card, and card, and may be a thick original or a thin original. Examples of cards include insurance cards, licenses, credit cards, and the like. The transport medium S also includes a booklet such as a passport. When targeting a booklet, a holder can be used. By accommodating the booklet in the spread state in the holder and mounting it on the mounting table 1, the booklet is conveyed together with the holder, and the image can be read.

<Paper feeding>
A first transport unit 10 is provided as a feeding mechanism that feeds the transport medium S along the route RT. In the case of the present embodiment, the first transport unit 10 includes a feed roller 11 and a separation roller 12 arranged to face the feed roller 11, and sequentially transports the transport medium S on the mounting table 1 one by one in the transport direction D1. .. A driving force is transmitted from the drive unit 3 such as a motor to the feed roller 11 via the transmission unit 5, and is rotationally driven in the direction of the arrow in the drawing (the forward direction in which the transport medium S is transported along the route RT). The transmission unit 5 is, for example, an electromagnetic clutch, and disconnects the driving force from the driving unit 3 to the feed roller 11.

<Drive unit>
For example, in the present embodiment, the transmission unit 5 that connects the drive unit 3 and the feed roller 11 is in a state in which the driving force is normally transmitted, and shuts off the driving force when the transport medium S is fed backward. When the transmission of the driving force is interrupted by the transmission unit 5, the feed roller 11 is in a freely rotatable state. Note that such a transmission unit 5 may not be provided when the feed roller 11 is driven in only one direction.

<Separation structure>
The separation roller 12 arranged to face the feed roller 11 is a roller for separating the transport medium S one by one, and is in pressure contact with the feed roller 11 at a constant pressure. In order to ensure this pressure contact state, the separation roller 12 is provided so as to be swingable and is biased to the feed roller 11. The driving force is transmitted from the drive unit 3 to the separation roller 12 via the torque limiter 12a, and the separation roller 12 is rotationally driven in the direction indicated by the solid line arrow (the direction opposite to the forward direction of the feed roller 11).

Since the driving force transmission of the separation roller 12 is restricted by the torque limiter 12a, when the separation roller 12 is in contact with the feed roller 11, the separation roller 12 rotates in a direction that rotates with the feed roller 11 (a direction indicated by a broken arrow). As a result, when a plurality of transport media S are transported to the pressure contact portion between the feed roller 11 and the separation roller 12, two or more transport media S, except for one, are restrained from being transported downstream. ..

In the present embodiment, the separation mechanism is composed of the separation roller 12 and the feed roller 11, but such a separation mechanism does not necessarily have to be provided, and the feeding medium for sequentially feeding the transport medium S one by one to the route RT. Any sending mechanism may be used. Further, in the case of providing the separating mechanism, instead of the structure such as the separating roller 12, a separating pad for giving a frictional force to the transport medium S is brought into pressure contact with the feed roller 11 so that the same separating work is performed. May be.

<Transfer structure>
The second transport unit 20 as a transport mechanism on the downstream side in the transport direction of the first transport unit 10 includes a drive roller 21 and a driven roller 22 that is driven by the drive roller 21, and is transported from the first transport unit 10. The transport medium S is transported to the downstream side. A driving force is transmitted from the driving unit 4 such as a motor to the driving roller 21, and is rotationally driven in the direction of the arrow in the figure. The driven roller 22 is pressed against the drive roller 21 at a constant pressure and is rotated by the drive roller 21. The driven roller 22 may be biased against the drive roller 21 by a biasing unit (not shown) such as a spring.

The third transport unit 30 located downstream of the second transport unit 20 in the transport direction includes a drive roller 31 and a driven roller 32 that is driven by the drive roller 31, and is transported from the second transport unit 20. The transported medium S is transported to the discharge tray 2. That is, the third transport unit 30 functions as a discharge mechanism. A driving force is transmitted from the driving unit 4 such as a motor to the driving roller 31, and is rotationally driven in the direction of the arrow in the figure. The driven roller 32 is pressed against the drive roller 31 at a constant pressure and is entrained by the drive roller 31. The driven roller 32 may be biased against the drive roller 31 by a biasing unit (not shown) such as a spring.

The discharge tray 2 is pivotally supported via a first hinge 101 provided below the image reading apparatus A so as to be rotatable with respect to the image reading apparatus A. Further, it is composed of a first discharge tray 2a on the side of the first hinge 101 and a second discharge tray 2b connected to the tip side thereof, and the second discharge tray 2b is rotatable with respect to the first discharge tray 2a. Is supported by.

<Image reading structure and control>
Here, in the image reading apparatus A of the present embodiment, the image reading unit 70 includes an image reading upper unit 701 and an image reading lower unit 702 arranged between the second transport unit 20 and the third transport unit 30. In order to read the image, the second transport unit 20 and the third transport unit 30 transport the transport medium S at a constant speed. By always setting the transport speed to be equal to or higher than the transport speed of the first transport unit 10, it is possible to reliably avoid the situation in which the subsequent transport medium S catches up with the preceding transport medium S. For example, in the present embodiment, speed control is performed such that the transport speed of the transport medium S by the second transport unit 20 and the third transport unit 30 is faster than the transport speed of the transport medium S by the first transport unit 10. did.

Even when the transport speed of the transport medium S by the second transport unit 20 and the third transport unit 30 and the transport speed of the transport medium S by the first transport unit 10 are the same, the drive unit 3 is controlled. It is also possible to form the minimum interval between the preceding transport medium S and the subsequent transport medium S by intermittently shifting the feeding start timing of the subsequent transport medium S.

<Double feed detection>
In the double feed detection sensor 40 arranged between the first transport unit 10 and the second transport unit 20, when the transport media S such as papers are brought into close contact with each other due to static electricity or the like and have passed through the first transport unit 10 ( That is, this is an example of a detection sensor (a sensor that detects the behavior or state of the document) for detecting this in the case of a multi-feed state in which they are conveyed in an overlapping manner. As the double feed detection sensor 40, various ones can be used, but in the case of the present embodiment, it is an ultrasonic sensor, and is provided with an ultrasonic wave transmission section 41 and its reception section 42, and a conveyance medium such as paper. The double feed is detected on the principle that the attenuation amount of the ultrasonic waves passing through the transport medium S is different between the case where the S is double-fed and the case where the S is transported one by one.

<Registration sensor>
The medium detection sensor 50 arranged on the downstream side of the double feed detection sensor 40 in the conveyance direction is located on the upstream side of the second conveyance section 20 and on the upstream side of the first conveyance section 10. This is an example of a detection sensor (a sensor that detects the behavior or state of a document), and is a position of the transport medium S transported by the first transport unit 10, more specifically, a position of the transport medium S at the detection position of the medium detection sensor 50. Detects whether the edge has reached or passed. As the medium detection sensor 50, various types can be used, but in the case of the present embodiment, the medium detection sensor 50 is an optical sensor, and is provided with a light emitting unit 51 and a light receiving unit 52 thereof. The carrier medium S is detected on the principle that the intensity (the amount of received light) changes.

In the case of the present embodiment, when the leading edge of the transport medium S is detected by the medium detection sensor 50, the transport medium S reaches the position where the double feed detection sensor 40 can detect the double feed. The detection sensor 50 is provided near the double feed detection sensor 40 and on the downstream side thereof. The medium detection sensor 50 is not limited to the above-mentioned optical sensor, and for example, a sensor (image sensor or the like) that can detect the end portion of the transport medium S may be used, or a lever type that projects to the route RT. It may be a sensor.

A medium detection sensor 60 different from the medium detection sensor 50 is arranged upstream of the image reading upper unit 701 and the image reading lower unit 702. This is an example of a downstream detection sensor arranged on the downstream side of the second transport unit 20, and detects the position of the transport medium S transported by the second transport unit 20. Although various types of medium detection sensors 60 can be used, in the case of the present embodiment, the medium detection sensor 60 is an optical sensor like the medium detection sensor 50, and includes a light emitting unit 61 and a light receiving unit 62, and the medium S The carrier medium S is detected on the principle that the received light intensity (amount of received light) changes due to arrival or passage. In the present embodiment, the medium detection sensors 50 and 60 are arranged on the upstream side and the downstream side of the second transport unit 20 in the transport direction, but only one of them may be disposed.

<Explanation of block diagram>
The control unit 80 will be described with reference to FIG. FIG. 2 is a block diagram of the control unit 8 of the image reading apparatus A.

The control unit 80 includes a CPU 81, a storage unit 82, an operation unit 83, a communication unit 84, and an interface unit 85. The CPU 81 executes the program stored in the storage unit 82 to control the entire image reading apparatus A. The storage unit 82 is composed of, for example, a RAM and a ROM. The operation unit 83 includes, for example, a switch and a touch panel, and receives an operation from the operator.

The communication unit 84 is an interface that performs information communication with an external device. When a PC (personal computer) is assumed as the external device, the communication unit 84 can be, for example, a USB interface or a SCSI interface. In addition to such a wired communication interface, the communication unit 84 may be a wireless communication interface, and may have both wired communication and wireless communication interfaces.

The interface unit 85 is an I/O interface that inputs and outputs data to and from the actuator 86 and the sensor 87. The actuator 86 includes the drive unit 3, the drive unit 4, the transmission unit 5, and the like. The sensor 87 includes a double feed detection sensor 40, medium detection sensors 50 and 60, an image reading upper unit 701, an image reading lower unit 702, and the like.

<Drive by receiving start instruction from PC>
The basic operation of the image reading apparatus A will be described. For example, when the control unit 80 receives an image reading start instruction from an external personal computer to which the image reading apparatus A is connected, the control unit 80 starts driving the first to third transport units 10 to 30. The transport media S loaded on the mounting table 1 are transported one by one from the transport media S located at the lowest position.

<Control during double feeding>
In the middle of the conveyance, the conveyance medium S determines whether or not there is a multifeed, and the conveyance is continued if it is determined that there is no multifeed. When it is determined that there is a double feed, the conveyance is stopped, or the succeeding transport medium S is not taken in by the first transport unit 10 and the transport medium S in the double feed state is discharged as it is. You can

<Starting reading according to the output of the registration sensor>
The control unit 80 starts the image reading by the image reading upper unit 701 and the image reading lower unit 702 of the transport medium S transported by the second transport unit 20 at the timing based on the detection result of the medium detection sensor 60. , The scanned images are temporarily stored and sequentially transmitted to an external personal computer. The transport medium S from which the image is read is discharged to the discharge tray 2 by the third transport unit 30, and the image reading process of the transport medium S is completed.

<Paper discharge structure>
FIG. 3 is a front view of the image reading apparatus A according to the embodiment of the present invention in a state where the discharge tray 2 is unfolded.

A display screen 93 is provided on the display panel 90 on the upper front, and operation keys 122 are provided at adjacent positions.

The lower panel 91 on the lower front side is provided with a discharge opening 92, and the transport medium S transported by the third transport unit 30 is discharged.

FIG. 4 is a front view of the image reading apparatus A according to the embodiment of the present invention in a state in which the discharge tray 2 is stored.

The discharge tray 2 is rotatably supported by the first hinge 101 provided below the image reading apparatus A so as to be rotatable with respect to the image reading apparatus A. The discharge tray 2b is configured to cover the front surface of the main body.

The first discharge tray 2a is attached to the main body 100 of the image reading apparatus A so as to be rotatable around the first hinge 101 as a fulcrum. The first discharge tray 2a is formed with the same size as the combined area of the lower panel 91 and the discharge opening 92, and is rotated about the first hinge 101 as a fulcrum when the discharge tray 2 is stored as shown in FIG. It is folded so as to cover the lower panel 91 and the discharge opening 92.

The second discharge tray 2b is formed to have the same size as the display panel 90, and when the discharge tray 2 is stored as shown in FIG. 4, the second discharge tray 2b is rotated about the second hinge 102 provided at the tip of the first discharge tray 2a. It moves and is folded so as to overlap the display panel 90.

FIG. 5 is a top view of the image reading apparatus A according to the embodiment of the present invention in a state where the discharge tray 2 is unfolded.

The transport medium S transported by the third transport unit 30 is discharged to the first discharge tray 2a through the discharge opening 92, and reaches the second discharge tray 2b depending on the size of the transport medium S and is guided.

A discharge position adjusting member 120 is rotatably provided on the first discharge tray 2a, and when a transport medium S having a smaller size than the first discharge tray 2a such as a business card is discharged, By rotating the carrier medium S to the upright position, the position where the carrier medium S stops can be adjusted, and the discharged carrier medium S can be made less likely to be scattered.

Further, the second discharge tray 2b is provided with a light transmitting portion 121, and is arranged at a position overlapping the operation key 122 provided on the display panel. The operation key 122 is a power button for turning on/off the power of the main body, and is configured to light up when the power is on. The light-transmitting portion 121 arranged at a position overlapping the operation key 122 can confirm whether the operation key 122 is in a lighting state or a non-lighting state even when the discharge tray 2 is housed. You can check the power status of.

<Display panel configuration>
A display screen 93 is arranged on the display panel 90 provided at a position overlapping the second discharge tray 2b when the second discharge tray 2b is stored.

The display screen 93 is arranged so that the feeding tray 110, the width W of the conveyance path, and the center line X are at the same position. The image reading apparatus A according to the embodiment of the present invention is configured to be able to feed an A4 letter size as the maximum conveyance path width Wmax, and the width is Wmax=216 mm. The width of the display screen 93 is 224 mm, which is a length exceeding Wmax.

Thereby, for example, the read image can be displayed on the display screen 93 in an actual size, and the finished state can be easily confirmed, so that the convenience for the user can be improved.

<Details of feeding structure>
FIG. 6 is a top view of the image reading apparatus A according to the embodiment of the present invention in a state in which the discharge tray 2 is stored.

The loading platform 1 is provided with a regulation member 111 that is slidably attached in a direction orthogonal to the transport direction according to the size of the transport medium S to be placed.

<Details of upper unit>
FIG. 7 is a schematic sectional view of the image reading apparatus A according to the embodiment of the present invention.

The main body 100 is composed of an upper unit 103 and a lower unit 104, and the upper unit 103 is rotatably attached to the lower unit 104 with a main body hinge 105 as a fulcrum.

The upper unit 103 includes a display screen 90 having a width exceeding the maximum conveyance path width Wmax on the display panel 90, and a supporting frame sheet metal of the display screen 93. Therefore, as shown in FIG. Is largely displaced to the front side in the transport direction as compared with the state in which the upper unit 103 is housed as shown in FIG.

Therefore, if there is momentum when the upper unit is unfolded, the image reading apparatus A may tip over, but in the image reading apparatus A according to the present embodiment, the upper unit 103 has the protrusion 130. It is possible to prevent the image reading device A from tipping over even if the center of gravity moves due to the expansion of the image. The protrusion amount of the protrusion 130 is such that the protrusion amount can be set below the discharge tray 2 when the upper unit 103 and the discharge tray 2 are stored as shown in FIG. In the unfolded state, the amount of protrusion is such that it is located further forward than the center of gravity of the upper unit 103 in the transport direction. As a result, it is possible to prevent the image reading apparatus A from falling over due to the unfolding of the upper unit 103, and to prevent the image reading apparatus A from unnecessarily protruding in the housed state in which the discharge tray 2 is housed so as not to disturb the user.

<Adjusting the discharge tray angle>
Further, on the upper surface of the projecting portion 130, a tray support portion 131 is rotatably provided so as to come into contact with the lower surface of the ejection tray 2 when the ejection tray 2 is unfolded.

As shown in FIG. 9, the discharge tray 2 is supported by the protrusions 130 and can receive the discharge medium S to be discharged in the expanded state. As shown in FIG. 10, when the tray supporting portion 131 is rotated so as to project upward from the upper surface of the projecting portion 130, it comes into contact with the lower surface side of the discharging tray 2 to support the discharging tray 2, and thus the projecting portion 130. The angle of the discharge tray 2 can be adjusted from the state of FIG.

For example, in the state of FIG. 10, the discharge tray 2 is lifted upward in the vertical direction as compared with the state of FIG. 9, and the position where the leading end of the transport medium S lands on the upper surface of the discharge tray 2 can be changed. .. As a result, in the state of FIG. 9, in the case where the leading end of the discharged transport medium S abuts against the rear end of the already discharged transport medium S and pushes it out, as shown in FIG. By changing the angle, in addition to the action of moving the rear end of the already discharged transport medium S to the lower unit 104 side, the tip of the succeeding transport medium S is surely placed on the upper surface of the already discharged transport medium S. Can be landed. With such a configuration, the alignment of the discharged transport medium S on the discharge tray 2 can be significantly improved.

The tray support portion 131 may be configured to support the discharge tray 2 even in the middle of the rotation range, and the angle of the discharge tray 2 may be adjustable in a plurality of steps. In that case, each transport medium S can receive the transport medium S at an angle having the highest alignment on the discharge tray 2, and the usability can be improved.

<Earth of upper unit>
FIG. 11 is a perspective view showing a state where the upper unit 103 of the image reading apparatus A according to the embodiment of the present invention is expanded.

If the upper unit 103 is rotated vigorously when it is stored, a large impact may be applied when the upper unit 103 contacts the lower unit 104 side, and a loud noise may be generated. In the image reading apparatus A according to the present embodiment, metal upper elastic members 140 are provided on both sides of the separation roller 12 of the upper unit 103.

When the upper unit 103 is in the housed state, the upper elastic member 140 is in the housed state while being elastically biased by the contact portion 141 provided on the lower unit 104 side. The end of the upper elastic member 140 on the side attached to the upper unit 103 is electrically connected to the ground side of the electrical component provided in the upper unit 130, and when the upper elastic member 140 comes into contact with the contact portion 141, the lower portion is lowered. It is electrically connected to the ground side of the electrical components arranged in the unit.

Therefore, in the housed state of the upper unit 103, the cushioning member can ground the upper unit 103 side.

<CIS unit ground>
FIG. 12 is a perspective view of the image reading apparatus A according to the embodiment of the present invention when the image reading lower unit 702 is attached. FIG. 12A shows a state before the image reading lower unit 702 is attached, and FIG. 12B shows a state after the image reading lower unit 702 is attached.

When the image reading lower unit 702 is inserted into the lower reading accommodating portion 1041 of the lower unit 104 as shown in FIG. It is inserted and fitted and fixed at the accommodation completion position as shown in FIG.

FIG. 13 is a schematic sectional view of the periphery of the image reading lower unit 702 of the image reading apparatus A according to the embodiment of the present invention. FIG. 13A shows a state before the image reading lower unit 702 is attached, and FIG. 13B shows a state after the image reading lower unit 702 is attached.

The lower surface of the image reading lower unit 702 is covered with a metal member 76, and is grounded to electrical components such as the CIS 71. The image reading lower unit 702 is grounded to the lower unit 104 by being inserted while urging the lower elastic member 75 with the metal member 76.

Here, since the image reading lower unit 702 is biased upward by the lower elastic member 75, the image reading lower unit 702 is lifted upward only by removing the fitting and fixing, and the image reading lower unit 702 can be removed. It becomes easy and the maintainability can be improved.

<CIS placement>
An embodiment relating to the image reading unit of the present invention will be disclosed in detail below.

The image reading upper unit 701 and the image reading lower unit 702, which are on the downstream side of the medium detection sensor 60, are for, for example, optically scanning, converting into an electric signal and reading as image data, and include an LED or the like inside. It is equipped with a light source, an image sensor, and a lens array. In the case of the present embodiment, the image reading upper unit 701 is arranged in the upper reading accommodating portion (not shown) provided in the upper unit 103, and the image reading lower unit 702 is arranged in the lower reading accommodating portion 1041 provided in the lower unit 104. The front and back surfaces of the transport medium S are read. However, it is possible to arrange one on either side of the upper unit 103 or the lower unit 104 and read only one side of the transport medium S. Further, in the present embodiment, the image reading upper unit 701 and the image reading lower unit 702 are arranged opposite to each other on both sides of the route RT, but they may be arranged at intervals in the direction of the route RT, for example.

The image reading lower unit 702 is fixed to the lower unit 104. On the other hand, the image reading upper unit 701 is movably supported by a pressure spring (not shown). As a result, the image reading upper unit 701 itself can be moved in parallel in the vertical direction with respect to the conveyance surface, and the image reading and conveyance of a thick original can be smoothly performed.

FIG. 14 is a vertical partial sectional view of the image reading upper unit 701 and the image reading lower unit 702 of the image reading apparatus A according to the embodiment of the present invention. (a) shows the case where the white reference portion faces, and (b) shows the case where the black portion faces.

The configurations of the image reading upper unit 701 and the image reading lower unit 702 will be described with reference to FIG. The image reading upper unit 701 includes a CIS 711 having a rod lens 711a for reading an image, a color reference member 721 having a white reference portion 721a, a contact glass 741 for guiding a document at a document reading position, a CIS 711 and a color reference member 721. It is composed of a sensor case 751 that holds the contact glass 741 and a lid 731 that serves as a lid for the sensor case. In this embodiment, the white reference portion 721a of the color reference member 721 is integrated with the CIS 711 by pasting, adhering, painting, or another method, and the black portion 721b is formed in a part of the CIS 711.

Similar to the configuration of the image reading upper unit 701, the image reading lower unit 702 has a CIS 712 having a rod lens 712a for reading an image, a color reference member 722 having a white reference portion 722a, and guides a document to a document reading position. A contact glass 742, a sensor case 752 that stores the CIS 712 and the color reference member 722 and holds the contact glass 742, and a lid 732 that serves as a lid for the sensor case. In addition, the CIS 712 is moved to a predetermined position. And a cam return spring 78 that urges the straight cam 74 to move the moved CIS 712 to the first position (initial position).

FIG. 15A is a vertical partial sectional view of the lower image reading unit 702 when facing the black portion, and FIG. 15B is a horizontal partial sectional view of the lower image reading unit 702 when facing the black portion. 16A is a vertical partial sectional view of the image reading lower unit 702 when facing the white reference portion, and FIG. 16B is a horizontal partial sectional view of the image reading lower unit 702 when facing the white reference portion.

The CIS 712 has protrusions 712a and 712b extending in the arrow z direction in FIG. The protrusion 712a is fitted into a cam groove 74a provided in the straight-moving cam 74. Further, the protrusion 712a is fitted into the elongated hole 732a provided in the lower lid 732 via the sliding member 760, and thereby the movement in the main scanning direction is restricted. On the other hand, the protrusion 712 b is fitted into the cam groove 74 b provided in the straight cam 74. Further, since the CIS 712 slides on the lower lid 732 via the sliding member 760 having good slidability, it is possible to reduce the abrasion of the CIS 712, the lower lid 732, and the cam groove 74a due to the movement of the CIS 712.

The straight cam 74 has cam grooves 74a and 74b into which the projections 712a and 712b of the CIS 712 are fitted, elongated holes 74c and 74d into which the projections 732b and 732c provided on the lower lid 732 are fitted, and a cam return spring 78 is hooked. And a hook portion 74e.

The rectilinear cam 74 is locked to the locking portion 732d of the lower lid 732 by the cam return spring 78, and is pulled in the arrow g direction in the drawing. Then, when facing the white reference portion, which is the first position (initial position), the protrusions 712a and 712b are located on the right side in the drawing, as shown in FIG. On the other hand, when facing the black portion, which is a predetermined position, the protrusions 712a and 712b are located on the left side in the drawing, as shown in FIG.

As described above, the linear cam 74 is engaged with the CIS 712 and is moved in the main scanning direction which is the longitudinal direction of the CIS 712 to move the CIS 712 in the sub-scanning direction, and the color reference provided on the image reading upper unit 701. The member 721 can be moved to either the position facing the white reference portion 721a or the position facing the black portion 721b. As a result, the background color of the document is switched when the image of the document is read.

By moving only the CIS 712 as in this embodiment, the load on the CIS sliding motor 73 can be reduced, and the motor can be downsized and the power consumption can be reduced.

The position of the white reference portion 721a or the black portion 721b of the color reference member 721 facing the CIS 712 can be determined by the output of the position detection sensor 770. The position detection sensor 770 is a detection unit that detects the position of the straight-moving cam 74. By detecting the position of the straight-moving cam 74, the CIS 712 is indirectly positioned to face either the white reference portion 721a or the black portion 721b. Is being detected.

In such an image reading apparatus, when the CIS 712 moves between the white reference portion 721a facing position and the black portion 721b facing position, if the CIS 712 shifts from the document image reading position, the leading end position shift of the document reading (reading position shift). ) Will be caused. If the leading edge position shift occurs, the image at the leading edge of the document or the trailing edge of the document is chipped, and the quality of the read image deteriorates. In order to prevent the displacement of the leading edge position, the position detection sensor 770 is used to detect the position of the CIS 712 at the time of reading the original.

In the present embodiment, according to the position of the CIS 712 detected by the position detection sensor 770, the image of the original is read after the leading edge of the original is detected by the medium detection sensor 60 at the white reference portion facing position and the black portion facing position. The tip position shift is prevented by changing the timing until the start.

Further, in the present embodiment, the position detection sensor 770 is arranged on the surface side of the lower reading accommodating portion 1041 provided in the lower unit 104 opposite to the conveying surface of the image reading lower unit 702 as shown in FIG. ..

The position detecting operation of the rectilinear cam 74 of the position detection sensor 770 will be described with reference to FIG.

When the power source of the image reading device is turned on, the straight cam 74 is moved in the direction of arrow a in FIG. 18, and the protrusion 74g of the straight cam 74 blocks the slit 770a of the position detection sensor 770 shown in FIG. The sensor 770 is moved to a position where it is turned on: BP). This BP is a position where the CIS 712 faces the black portion 712b. Then, the rectilinear cam 74 is moved in the direction of arrow b in FIG. 18 to a position (WP) where the gear 79 described later makes a half rotation. This WP is a position where the CIS 712 faces the white reference portion 712a. This series of operations is an initialization operation of the background switching mechanism that is performed every time the power of the device is turned on.

After the initialization operation, when the background color is set to white and the reading of the image is started, the white reference data for shading correction is read while the straight cam 74 is not moved and is positioned at WP. Then, the image of the conveyed original is read.

When the background color is set to black, the white reference data for shading correction is read in the same manner as when the background color is white, and then the rectilinear cam 74 is moved to the BP to move the conveyed document. Read the image.

Next, the configuration of the CIS drive unit will be described with reference to FIGS. 19 and 20.

FIG. 19 is a perspective view of the periphery of the CIS drive unit with the image reading lower unit 702 removed, and FIG. 20 is a partial cross-sectional view of the periphery of the CIS drive unit.

As shown in FIG. 19, the lower unit 104 has a through hole 104a through which the fitting portion of the CIS sliding motor 73 and the rectilinear cam 74 penetrates.

Further, the lower reading accommodating portion 1041 of the lower unit 104 is provided with a protruding portion 104c so as to cover the through hole 104a and a CIS driving portion described later. The protrusion 104c reduces paper dust or the like that has fallen from the transport path to the lower reading container 1041 from accumulating on the components provided in the lower unit 104 or the CIS driver through the through hole 104a.

As shown in FIG. 20, the CIS driving unit is a gear 79 that transmits a driving force to the linear cam 74, a CIS sliding motor 73 that operates the pinion gear 77, and a CIS sliding motor 73 that is press-fitted into contact with the gear 79. And a pinion gear 77.

The gear 79 is provided with a protrusion 79a that is fitted into a cam groove 74f provided in the rectilinear cam 74. When the CIS sliding motor 73 rotates, the driving force is transmitted to the pinion gear 77, the gear 79, and the linear cam 74, and the linear cam 74 moves in the main scanning direction.

Further, as shown in FIG. 21, the CIS sliding motor 73 is arranged on the surface of the lower reading/accommodating section 1041 provided in the lower unit 104 on the side opposite to the conveyance path. That is, it is arranged on the surface of the lower image reading unit 702 sandwiching the lower reading accommodating section 1041 on the side opposite to the conveyance path side. By disposing the CIS sliding motor 73 on the surface of the image reading lower unit 702 on the side opposite to the conveyance path side, the widthwise dimension of the apparatus main body can be reduced.

By integrating the CISs 711 and 712 with the color reference plates 721 and 722 as in the present embodiment, the background colors of the front and back surfaces can be changed by moving the CIS 712 on one side even in an image reading apparatus that simultaneously reads both sides. It becomes possible to switch. Therefore, it is not necessary to provide each of the two reading units 701 and 702 with a CIS drive unit or a linear cam 74 for driving the units. As a result, it is possible to reduce the space for providing them and to downsize the device, and to reduce the number of parts to reduce the cost of the device.

Further, in the present embodiment, the CIS driving unit is arranged in the lower unit 104 instead of the reading lower unit 702, so that only the reading lower unit 702 can be attached to and detached from the apparatus, and the unit to be handled at the time of maintenance becomes small. The property is improved.

In particular, by providing the rectilinear cam 74 for moving the CIS 712 under the image reading lower unit 702, the background can be switched without expanding the width direction of the image reading apparatus A.

A image reading apparatus S transport medium 1 mounting table 2 discharge tray 2a first discharge tray 2b second discharge tray 3, 4 drive unit 5 transmission unit 10 first transport unit 11 feed roller 12 separation roller 20 second transport unit 21 drive roller 22 Driven Roller 30 Third Transport Portion 31 Drive Roller 32 Driven Roller 40 Driven Roller 40 Double Feed Detection Sensors 50, 60 Medium Detection Sensor 73 CIS Sliding Motor 74 Linear Cam 75 Lower Elastic Member 76 Metal Member 77 Pinion Gear 78 Cam Return Spring 79 Gear 80 control unit 84 communication unit 90 display panel 91 lower panel 93 display screen 100 main body 101 first hinge 102 second hinge 103 upper unit 104 lower unit 105 main body hinge 111 regulating member 120 discharge position adjusting member 121 translucent unit 122 operation key 130 Projection 131 Tray support 140 Upper elastic member 141 Contact 701 Image reading upper unit 702 Image reading lower unit 711, 712 Contact image sensor (CIS)
721, 722 Color reference plates 721a, 722a White reference parts 721b, 722b Black parts 731, 732 Lids 741, 742 Contact glasses 751, 752 Sensor case 760 Sliding member 770 Position detection sensor 800 Transparent platen roller 801 Cylindrical background plate 802 Shaft 803 Bearing 804 Lid 805 Gear 806 Motor

Claims (2)

An apparatus main body having a conveyance unit that conveys a document along a conveyance path,
A sensor case attached to the apparatus main body along the transport path,
A reading sensor that is provided in the sensor case so as to be movable in the conveyance direction of the document, and reads one side of the document;
A background member having a first background portion and a second background portion which are provided so as to face the reading sensor with the conveyance path interposed therebetween and are arranged side by side in the conveyance direction;
A sensor moving member for moving the reading sensor in the transport direction;
Equipped with
The sensor moving member is movably engaged with the reading sensor with respect to the sensor case,
A driving source that transmits a driving force to the sensor moving member from a side opposite to the reading sensor side;
The sensor moving member is
By moving in the width direction against the conveying direction of the document, and wherein the moving the reading sensor through a cam groove that engages the pin engages provided in the reading sensor before Ki搬 feeding direction It is that images reader. An apparatus main body having a conveyance unit that conveys a document along a conveyance path,
A sensor case attached to the apparatus main body along the transport path,
A reading sensor that is provided in the sensor case so as to be movable in the conveyance direction of the document, and reads one side of the document;
A background member having a first background portion and a second background portion which are provided so as to face the reading sensor with the conveyance path interposed therebetween and are arranged side by side in the conveyance direction;
A sensor moving member for moving the reading sensor in the transport direction;
Equipped with
The sensor moving member is movably engaged with the reading sensor with respect to the sensor case,
A driving source that transmits a driving force to the sensor moving member from a side opposite to the reading sensor side;
The drive source transmits a drive force to the sensor moving member via a through hole provided in the apparatus body ,
Wherein the periphery of the through hole, to that images read, characterized in that the projection extending toward the sensor casing is provided apparatus.

Images