JP6697934B2 - Sheet transport device - Google Patents

Description

  The present invention relates to a conveying device for conveying a sheet material such as a document such as a scanner or a printer.

  An example of a conventional image reading apparatus using a sheet-through type automatic document feeder will be described. This image reading apparatus includes an upper unit and a lower unit, and a space sandwiched between the upper unit and the lower unit serves as a conveyance path for conveying a document. A metal transport plate is provided in the transport path for the purpose of reducing static electricity generated by friction of paper and as an EMC countermeasure. In addition to this carrier plate, the lower unit is equipped with a metal shield plate that shields the electrical board for device control as an EMC countermeasure. The carrying plate is provided with a bent protrusion, the protrusion is pressed against the shield plate, and the shield plate is connected to the ground of the apparatus. Therefore, static electricity generated in the transport path flows to the ground of the device through the transport plate and the shield plate.

  In Patent Document 1, the two metal plates are pressed against each other by a metal plate spring to obtain electrical continuity between the two metal plates.

Japanese Patent No. 5821474

  In the conventional image reading device, the area of the carrier plate when the carrier plate is expanded is increased by the amount of the protruding part provided on the carrier plate, and the protruding part is caught on the peripheral parts during the assembly work of the device, and the protruding part is deformed. Assembleability was poor because it could be caused.

  Patent Document 1 requires a manufacturing cost for providing a leaf spring that connects two sheet metals.

  Therefore, measures against static electricity and EMC that can reduce the size of the device and improve the assemblability are required.

According to the sheet conveying device of the present invention,
A first conductive member forming a conveyance path along which the sheet is conveyed;
A second conductive member to which an end Ru is arranged to exert a resilient force come into contact with the first conductive member,
A tubular portion that accommodates the second conductive member and that regulates the urging direction of the second conductive member;
A third conductive member supporting the electric substrate,
The third conductive member has a plate portion that is inserted into an opening provided on the opposite side of the transport path in the tubular portion,
Characterized by pressing the other end of said second conductive member by the plate portion.

  According to the present invention, the conduction structure between the upper unit and the lower unit as a countermeasure against static electricity and EMC can be simplified, serviceability and assemblability can be improved, and the device can be downsized.

1 is a schematic diagram of an image reading apparatus according to an embodiment of the present invention. 3 is a block diagram of a control unit of the image reading apparatus according to the embodiment of the present invention. FIG. 1 is a front view of an image reading device according to an 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. 4 is another schematic cross-sectional view of the image reading device according to the embodiment of the present invention. FIG. 3 is an enlarged view of the vicinity of the sheet feeding unit of the image reading apparatus according to the embodiment of the present invention. 3 is a schematic view of a lock portion according to an embodiment of the present invention. FIG. 3 is a front view of the upper unit of the image reading apparatus according to the embodiment of the present invention viewed from the transport path RT side. FIG. 3 is an enlarged view of a main part of the image reading apparatus according to the embodiment of the present invention. FIG. 3 is a front view of the lower unit of the image reading apparatus according to the embodiment of the present invention viewed from the transport path RT side. FIG. 3 is a cross-sectional view showing a state of electrical connection of the image reading apparatus according to the embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the periphery of the coil spring 302 according to the embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the periphery of the coil spring 302 according to the embodiment of the present invention. The schematic perspective view of the circumference of the coil spring 302 which concerns on embodiment of this invention. The schematic perspective view of the circumference of the coil spring 302 which concerns on embodiment of this invention. The detailed sectional view of the circumference of the coil spring 302 which concerns on embodiment of this invention.

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 in a conveyance path RT, reads an image of the conveyance medium S, and discharges the image onto a discharge tray 2. The transport medium S to be read is, for example, a sheet of OA paper, check, check, business card, card, etc., and may be a thick sheet or a thin sheet. Examples of cards include insurance cards, licenses, credit cards and the like.
<Paper feeding>

  A first transport unit 10 is provided as a feeding mechanism that feeds the transport medium S along the transport path 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. Transport. Further, the first transport unit 10 is provided with an upper transport guide 13 and a lower transport guide 14, and the upper transport guide 13 and the lower transport guide 14 are arranged at positions facing each other with the transport path RT interposed therebetween. The two guides guide the transport medium S to the transport unit 20.

A driving force is transmitted to the feed roller 11 from a drive unit 3 such as a motor via a transmission unit 5, and is rotationally driven in a direction indicated by an arrow in the drawing (a forward direction in which the transport medium S is transported along the transport path 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 driving units 3 and 4 and the feed roller 11 is set 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. To do. When the transmission of the driving force is interrupted by the transmission unit 5, the feed roller 11 becomes in a freely rotatable state. It should be noted that such a transmission unit 5 may not be provided when the feed roller 11 is driven only in 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 secure 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 of 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 along 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 prevented from being transported downstream. ..

In the present embodiment, the separating roller 12 and the feed roller 11 constitute the separating mechanism. However, such a separating mechanism may not necessarily be provided, and the conveying medium S is sequentially fed to the conveying path RT one by one. Any feeding 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 applying a frictional force to the transport medium S is brought into pressure contact with the feed roller 11 so that the same separating operation is performed. You may.
<Transfer structure>

  The second transport unit 20 as a transport mechanism on the downstream side of the first transport unit 10 in the transport direction includes a drive roller 21 and a driven roller 22 that follows the drive roller 21, and is transported from the first transport unit 10. The transport medium S is transported downstream. 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 rotates with 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 follows 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 by a first hinge 6 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 6 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, since the image is read by the image reading unit 70 arranged between the second transport section 20 and the third transport section 30, the second transport section 20 and the The 3 transport unit 30 transports 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 so 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 paper 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 and state of the sheets) for detecting this in the case of a double feed state in which the sheets are conveyed in an overlapping manner. Various types of multi-feed detection sensors 40 can be used, but in the case of the present embodiment, the multi-feed detection sensor 40 is an ultrasonic sensor, and includes an ultrasonic wave transmission unit 41 and a reception unit 42 thereof, and a conveyance medium such as paper. The double feed is detected on the principle that the attenuation amount of the ultrasonic wave 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 arranged on the upstream side of the second conveyance section 20 and on the upstream side arranged on the downstream side of the first conveyance section 10. It is an example of a detection sensor (a sensor that detects the behavior or state of a sheet), and is the position of the transport medium S transported by the first transport unit 10, more specifically, the edge of the transport medium S at the detection position of the medium detection sensor 50. Detects whether a part has arrived 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, and receives light when the transport medium S reaches or passes. The carrier medium S is detected on the principle that the intensity (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 transport path RT. Sensor may be used.

A medium detection sensor 60 different from the medium detection sensor 50 is arranged upstream of the image reading unit 70. 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. As the medium detection sensor 60, various types 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 is provided with a light emitting unit 61 and a light receiving unit 62. The carrier medium S is detected on the principle that the received light intensity (received light amount) 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 the medium detection sensor 60 may be used alone.
<CIS placement>

The image reading unit 70 on the downstream side of the medium detection sensor 60 is, for example, a unit that optically scans, converts into an electric signal, and reads it as image data. And so on. In the case of the present embodiment, the image reading units 70 are arranged one on each side of the conveyance path RT and read the front and back surfaces of the conveyance medium S. However, it is also possible to arrange one on only one side of the transport path RT and read only one side of the transport medium S. Further, in the present embodiment, the image reading units 70 are arranged opposite to each other on both sides of the conveyance path RT, but they may be arranged at intervals in the direction of the conveyance path RT, for example. Further, at least one of the two image reading units 70 may be supported so as to be movable in the thickness direction of the transport medium S. For example, one image reading unit 70 is fixed to a lower unit 104 described later, and the other image reading unit is supported in an upper unit 103 described later so as to be movable in a direction perpendicular to a conveying surface and a spring. Then, it is urged against the image reading unit 70 facing the other side. With this configuration, since the image reading unit 70 on the upper unit 103 side moves according to the thickness of the document when the document passes, it is possible to read images from thin paper to thick paper.
<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 controls the entire image reading apparatus A by executing the program stored in the storage unit 82. The storage unit 82 includes, 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, a SCSI interface, or a LAN. In addition to such a wired communication interface, the communication unit 84 may be a wireless communication interface, and may include both wired and wireless communication interfaces.

The interface unit 86 is an I/O interface that inputs and outputs data to and from the actuator 85 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 the double feed detection sensor 40, the medium detection sensors 50 and 60, the image reading unit 70, and the like.
<Drive by receiving start instruction from PC>

The basic operation of the image reading apparatus A will be described. When the control unit 80 receives an image reading start instruction from an operation screen such as the display panel 90, the touch panel, or the key switch 122 provided in the image reading apparatus, the control unit 80 starts driving the first transport unit 10 to the third transport unit 30. To do. 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 the conveyance medium S is double fed, and if it is determined that there is no double feeding, the conveyance is continued. When it is determined that there is a double feed, the transport is stopped, or the subsequent 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 units 70, 70 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, and reads the read image. Primary memory is stored and sequentially sent to an external personal computer. The transport medium S from which the image has been read is discharged to the discharge tray 2 by the third transport unit 30, and the image reading process of the transport medium S ends.
<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 large display panel 90 is provided on the upper unit 103 that constitutes the front side of the apparatus body. Further, 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.
<Details of feeding structure>

  FIG. 4 is a top view of the image reading apparatus A according to the embodiment of the present invention with the discharge tray 2 housed therein.

  The mounting table 1 of the first transport unit 10 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.

In the storage state of the discharge tray 2 shown in FIG. 4, the display panel 90 of the upper unit 103 is covered with the discharge tray 2. An operation arm 205 for opening and closing the transport path RT is provided at the upper end of the upper unit 103 on the mounting table 1 side, which will be described in detail later. <Details of upper unit>

  5 and 6 are schematic sectional views 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.

  Since the upper unit 103 is provided with the support frame sheet metal of the display screen 93 having a width exceeding the maximum conveyance path width Wmax on the display panel 90, the center of gravity when the upper unit 103 is expanded as shown in FIG. As shown in FIG. 5, the upper unit 103 is largely displaced to the front side in the transport direction as compared with the state in which the upper unit 103 is stored.

  Therefore, the image reading device A may tip over if there is momentum when the upper unit 103 is unfolded. However, the image reading device A according to the present embodiment has the protrusion 130, and thus the upper unit Even if the center of gravity moves due to the expansion of 103, the image reading apparatus A can be prevented from falling. 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 the image reading apparatus A is positioned further forward than the center of gravity of the image reading apparatus A 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 protruding more than necessary in the housed state in which the discharge tray 2 is housed so as not to disturb the user. <Earth of upper unit>

  7 and 8 are enlarged views of the vicinity of the sheet feeding unit in a state where the upper unit 103 of the image reading apparatus A according to the embodiment of the present invention is housed in the lower unit 104.

  If the upper unit 103 is swung with great force when it is stored, a large impact may be applied when the upper unit 103 contacts the lower unit 104 side, and a loud sound may be generated. In the image reading apparatus A according to the present embodiment, a lock member 201 that holds the upper unit 103 in a housed state is provided, and a conductive upper elastic member 140 is provided near the lock member 201. As shown in FIG. 8, the lock member 201 includes a hook claw 203 that engages with a hook part 202 provided in the lower unit 104, and a direction in which the hook claw 203 is engaged with the hook part 202 by an extension spring 204 (arrow a). Direction) and the hook portion 202 and the hook claw 203 engage with each other, so that the upper frame 103 maintains the housed state. By moving the operation arm 205 of the lock member 201 in the direction of arrow b, the hook claw 203 is disengaged from the hook portion 202, and the upper unit 103 can rotate in the opening direction with the main body hinge 105 (see FIG. 5) as a fulcrum. become. The upper elastic member 140 uses a wire spring such as a torsion spring, and has a sufficient force to push the upper unit 103 in the direction of arrow c.

  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.

  A part of the contact portion 141 is provided with an inclination, and when the upper unit 103 is in the housed state, the upper elastic member 140 abuts the inclined portion, and when the hook portion 202 and the hook claw 203 are disengaged, the upper unit 103 is released. It is easy to push up.

  Here, the state before the upper elastic member 140 is urged is shown by a dotted line, and the state after the urging is shown by a solid line. That is, the distance e is the displacement amount (deflection amount) of the upper elastic member. On the other hand, the hook amount between the hook portion 202 and the hook claw 203 is f. The relationship between the deflection amount and the applied amount is e>f, and when the applied amount is removed, the upper unit 103 can be pushed up by the distance e.

  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 103, and the upper elastic member 140 comes into contact with the contact portion 141 to lower the lower portion. Electrical connection is made to the ground side of the electrical components arranged in the unit 104. Therefore, in the housed state of the upper unit 103, it is possible to ground the upper elastic member 140.

  FIG. 9 shows a front view of the upper unit 103 of the image reading apparatus A according to the embodiment of the present invention as viewed from the side of the transport path RT.

  As shown in FIG. 9, the upper elastic member 140 is disposed outside the document transport path on the document transport surface together with the lock member 201, and is perpendicular to the transport direction with the document transport path interposed therebetween, and It is located on both sides in the width direction of the upper unit 103. Accordingly, even when the upper unit 103 is vigorously accommodated, the elastic members are uniformly bent on both sides of the upper unit 103 on the left and right sides in the drawing, and the upper unit 103 is prevented from being deformed such as a momentary twist. At the same time, the shock is alleviated by the upper elastic member 140, so that the electric components inside can be protected. In particular, when the upper unit 103 is provided with the display screen 93 on the display panel 90 and the operation keys 122 and the like at the adjacent positions as described above, not only the weight of the upper unit 103 becomes heavy, but also parts that are not easily affected by impact are provided. Since there are many, it is essential to mitigate the impact on electrical components.

  By arranging the upper elastic member 140 in the vicinity of the lock member 150, which is separated from the main body hinge 105, the variation of the load during the urging is reduced, and the impact can be evenly mitigated on the left and right.

  FIG. 10 is a diagram showing a state of electrical connection of the upper elastic member 140 in the device cross-sectional view of the image reading device A according to the embodiment of the present invention.

  One end of the upper elastic member 140 is in contact with the conductive upper transport guide 13 (for example, a metal steel plate) provided as a transport path of the upper unit 103. The upper transport guide 13 is electrically connected to an upper metal member 74 that covers the image reading unit 70, which will be described later, and is electrically connected to the contact portion 141 provided on the lower unit 104 side via the upper elastic member 140. It is connected to the. That is, the upper conveyance guide 13 and the lower conveyance guide 14 (for example, a metal steel plate) are electrically connected to each other by the upper elastic member 140 when the upper unit 103 is accommodated in the lower unit 104.

  FIG. 11 is a front view of the lower frame 104 of the image reading apparatus A according to the embodiment of the present invention, as viewed from the transport path RT side.

  A part of the conductive lower transport guide 14 forming the transport path serves as a contact portion 141. The contact point 141 is located outside the transportable range of the transport medium S, and the lock member 201 is also outside the transportable range of the transport medium S.

  In the image reading apparatus A according to the embodiment of the present invention, static electricity generated by the conveyance of the conveyance medium S flows through the upper conveyance guide 13 and the lower conveyance guide 14, and the electric charge that flows into the upper conveyance guide 13 is generated by the upper elastic member 140. It flows to the lower conveyance guide 14. Further, since the upper elastic members 140 are arranged on both sides of the transport path RT in the direction perpendicular to the transport direction and are in contact with the contact portions 141, the movement of charges due to static electricity does not deviate in one direction. Therefore, it is possible to prevent the signal of the image reading unit 70 from being erroneously operated due to the change of the electromagnetic wave generated by the movement of the electric charges.

  Although the upper unit 103 is pushed up by the urging force of the upper elastic member 140, it is preferable that the finger of the user should enter the pushed-up space. In that case, the displacement amount of the upper elastic member 140 is required to some extent, and accordingly, the contact portion 141 also needs to have a certain length in the direction parallel to the transport direction D1. In the present embodiment, the upper elastic member 140 is brought into contact with the portions on both sides of the transport path, which are narrow in the width direction but can secure a certain area in the transport direction D1. The upper unit 103 can be lifted to a desired height, and at the same time, electrical contact can be made to establish electrical continuity between the upper unit 103 and the lower unit 104. Furthermore, by making electrical contact to both sides of the transport path, even if the transport medium S is electrostatically charged, static electricity can be electrically discharged to both the upper unit 103 and the lower unit 104. The configuration can be made easier, and it is possible to take effective countermeasures against static electricity and the like in the entire apparatus rather than treating static electricity in the lower unit 104. <CIS unit ground>

  FIG. 12 is a diagram showing a state of electrical connection in the apparatus cross-sectional view of the image reading apparatus A according to the embodiment of the present invention.

  The image reading unit 70 is provided with a contact image sensor (hereinafter, CIS) 71 inside.

  When the image reading unit 70 is inserted into the accommodating portion 77a of the lower unit 104, the image reading unit 70 is inserted while urging the metal lower elastic member 75 protruding from the lower unit 104 side. To be done. The lower elastic member 75 is electrically connected to the lower conveyance guide 14.

  The lower surface of the image reading unit 70 is covered with a lower metal member 76, and electrical components such as the CIS 71 inside the image reading unit are protected from static electricity. The image reading unit 70 is grounded to the lower unit 104 by being inserted while urging the lower elastic member 75 with the metal member 76.

  The other side of the image reading unit 70 is arranged at a substantially opposite position with the conveyance path RT interposed therebetween, and is movably stored in a storage portion 77b provided with an upper metal member 74 of the upper unit 103, and an electric device such as a CIS 71 is installed. Parts are protected from static electricity. The upper metallic member 74 has an elastic portion, and is electrically connected by pressing the elastic portion against the upper conveyance guide 13. Instead of the elastic portion, a conductive member (for example, a torsion spring) or the like may be used for connection.

  Further, the upper metallic member 74 is electrically connected to a static elimination brush 79 located downstream of the upper unit 103 via a metallic member 78. The static elimination brush 79 eliminates static electricity charged on the surface of the transport medium S. The discharged electric charge is conducted from the metal member 78 through the upper metal member 74 to the upper conveyance guide 13 and flows to the ground portion of the lower unit 104 via the upper elastic member 140.

  As described above, the static electricity generated on the upper side by the transport medium S and the static electricity generated on the transport medium S are conducted to the lower unit 104 side by the upper elastic member 140 by electrically connecting the conductive members from the static elimination brush 79. It becomes possible to do.

  The upper transport guide 13, the upper metal member 74, and the metal member 78 may all be made of the same component.

  Further, the upper metallic member 74 is configured to detect electrical components (for example, the display screen 93, the operation keys 122, and various sensors in the display panel 90 provided in the upper unit 103 via the conductive members 401a and 401b. It is grounded by electrically connecting it to the board that controls the signal). <Other lower unit configuration>

  As described above, the lower unit 104 is connected by the main body hinge 105 for rotatably mounting one end side of the upper unit 103, and the other end side is rotated in the opening direction by the repulsive force of the upper elastic member 140. To prevent this, the upper frame 103 is provided with a hook portion 202 that can be kept in a housed state by engaging with a lock member 201 provided in the upper frame 103.

  Further, the actuator 86 for conveying the conveyance medium S, the driving rollers 21, 31, the lower conveyance guide 14, the storage section 77 of the image reading unit 70, the communication section 84 for controlling the actuator 86, the support frame 301, the control section 80, etc. Is provided inside the lower unit 104.

  As shown in FIG. 12, a coil spring 302 as a second conductive member urges one end on the upstream side of the lower conveyance guide 14 as a first conductive member attached to the lower unit 104, One end on the downstream side is connected to the lower metal member 76 via the lower elastic member 75. The coil spring 302 is urged by the support frame 301 as a third conductive member on the side opposite to the side urging the lower transport guide 14, and the lower metal member 76 and the lower transport guide 14 are supported by the support frame 301. Electrically connected to.

  As described above, the static electricity generated on the lower side by the transport medium S can be conducted from the lower metal member 76 to the support frame 301 via each electrical connection portion. The support frame 301 is connected so as to be at the same potential as the ground potential of the electric board 605 or a control board (not shown), etc., so that no potential difference occurs between the metal parts, and electrostatic charging can be prevented. .. Further, the radiation noise of the device can also be reduced by connecting the respective parts to establish conduction in this way.

  Here, as a schematic view of the periphery of the coil spring 302, sectional views are shown in FIGS. 13 and 14, and perspective views are shown in FIGS. 15 and 16. As shown in FIG. 13, the coil spring 302 is provided so as to be housed in the tubular portion 601 provided on the lower unit 104, and is pressed against the side plate 604 (plate portion) provided on the support frame 301 and the lower conveyance guide 14, respectively. To do. The side plate 604 may be an integral part of the support frame 301. As shown in FIG. 15, an opening 603 that is partially opened is provided on the opposite side of the transport path of the tubular portion 601, and the side plate 604 of the support frame 301 enters the opening 603 to move the coil spring 302 to the lower transport guide 14 side. Press on. In order to improve the assembling property, the opening 603 provided in the tubular portion 601 may be a slit, and the size of the opening of the opening 603 may be smaller than the diameter of the coil spring 302.

  The opening 603 may be provided as a separate component as described later. According to this configuration, it is possible to prevent the coil spring 302 from dropping when the support frame 301, which will be described later, is attached or detached.

  The support frame 301 is a component that fixes the electric board 605 and reduces radiation noise of the electric board 605. The electric board 605 may need to be replaced for customer service or the like, and can be attached to and detached from the device integrally with the support frame 301. As shown in FIGS. 14 and 16, the method of assembling the support frame 301 to the apparatus is as follows. The shaft portion 602 is inserted into the U-shaped portion 606 of the support frame 301 to which the electric substrate 605 is fixed, and the support frame 301 is centered around the shaft portion 602. Is rotated in the direction of arrow g until the side plate 604 comes into contact with the edge of the opening 603, and is fixed to the lower unit 104 in the state of FIGS. The method of removing the support frame 301 is the opposite. When the support frame 301 is assembled, the shaft 602 is used as a guide to rotate the assembly so that the side plate 604 can be reliably inserted into the opening 603.

  Further, although the support frame 301 does not have a fixing structure such as a screw with respect to the lower conveyance guide 14, the opening direction of the U-shaped portion 606 is the direction in which the support frame 301 extends, and the lower conveyance guide 14 Since the weight including the member includes a load in the direction in which the lower conveyance guide 14 and the support frame 301 are fitted to each other, stable fixing is achieved.

  For example, a stainless plate may be used as the material of the lower conveyance guide 14 as a material that does not easily wear, and an electrogalvanized steel plate may be used as the material of the support frame 301 as a relatively inexpensive material. Since the electrogalvanized steel plate has relatively high electric resistance and is difficult to conduct, the support frame 301 using the electrogalvanized steel plate in the above-described configuration is made conductive by bringing a cut surface without plating into contact with the coil spring 302. There is.

  In the configuration of the coil spring 302 described above, since there is no portion such as the protruding portion of the transport plate of the conventional image reading apparatus described above, the area when the lower transport guide 14 is deployed can be reduced, and the component cost and the die cost can be reduced. .. In addition, since there is no possibility of deforming the protrusion by hooking the protrusion on the peripheral parts during the assembly work of the apparatus, the assembling property can be improved and the quality can be stabilized.

  The coil spring 302 can be assembled only by dropping the coil spring into the tubular portion 601, and since it is not necessary to perform positioning, hooking, etc., the assembling property can be improved.

  Further, in the configuration using the coil spring 302 described above, it is the coil spring 302 that makes the two sheet metals (the lower conveyance guide 14 and the support frame 301) electrically conductive, and the cost of the die is not the same as in the case of Patent Document 1. Therefore, the manufacturing cost can be reduced. Further, since the coil spring 302 can have a smaller component size in the coil radial direction than the leaf spring of Patent Document 1, the device can be downsized. Further, since it is only required to be inserted inside the tubular portion 601, and there is no need to provide a fixing portion, the structure is simple and the workability is improved.

  FIG. 17 is a detailed sectional view around the coil spring 302. It shows a cross-sectional view in a plane parallel to the transport direction D1 passing through the central axis of the opening 603 formed in the tubular portion 601. The tubular portion 601 is formed as a tubular space provided in the lower unit 104 and is in contact with the lower transport guide 14. In order to improve the workability of inserting the coil spring 302 into the tubular portion 601, the lower unit 104 includes a lower frame 104a on the side of the conveyance path and a lower guide 104b attached to the lower frame 104a in the normal direction of the conveyance path. It is composed of. The lower guide 104b is provided with a slit as an example of the opening 603.

  By doing so, after the lower frame 104a and the lower transport guide 14 are attached, the coil spring 302 is inserted into the tubular portion 601, and the lower guide 104b provided with a slit so as to cover it is attached to remove the coil spring 302. Can be prevented with a simple configuration. By inserting the side plate 604 into the slit, it is possible to ensure reliable conduction between the support frame 301 and the lower conveyance guide 14 without using a fixing member such as a screw.

A image reading device S transport medium 1 mounting table 2 discharge trays 3, 4 drive unit 5 transmission unit 10 first transport unit 11 feed roller 12 separation roller 13 upper transport guide 14 lower transport guide 20 second transport unit 21 drive roller 22 driven Roller 30 Third Transport Unit 31 Drive Roller 32 Driven Roller 40 Double Feed Detection Sensor 50, 60 Medium Detection Sensor 70 Image Reading Unit 71 Contact Image Sensor (CIS) 74 Upper Metal Member 75 Lower Elastic Member 76 Lower Metal Member 77 Storage Part 78 Metal member 79 Static elimination brush 80 Control part 84 Communication part 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 110 Feed tray 111 Restricting member 122 Operation key 140 Upper elastic member 141 Contact portion 201 Lock member 202 Hook portion 203 Hook claw 204 Extension spring 205 Operation arm 301 Support frame 302 Coil spring 401a Conductive member 1
401b conductive member 2
501 Lower elastic member 502 Contact part 601 Cylindrical part 602 Shaft part 603 Opening part 604 Projecting part 605 Electric board

Claims (5)

A first conductive member forming a conveyance path along which the sheet is conveyed;
A second conductive member to which an end Ru is arranged to exert a resilient force come into contact with the first conductive member,
A tubular portion that accommodates the second conductive member and that regulates the biasing direction of the second conductive member;
A third conductive member supporting the electric substrate,
The third conductive member has a plate portion that is inserted into an opening provided on the opposite side of the transport path in the tubular portion,
Sheet conveying apparatus characterized by pressing the other end of said second conductive member by the plate portion. The opening is a slit provided in the tubular portion,
The sheet conveying device according to claim 1, wherein the plate portion is inserted into the slit.   The sheet conveyance device according to claim 2, wherein the plate portion is perpendicular to the conveyance path and extends parallel to the conveyance path. A fixed shaft provided in the main body of the sheet conveying device ,
A support portion provided on the third conductive member,
The support portion is in contact so as to be rotatable with respect to the fixed shaft, the fixed shaft of the said third conductive member by rotating around the, said plate portion can abut on the opening sheet conveying device according to any one of claims 1 to 3, characterized in that. A conductive upper conveyance guide that is arranged so as to face the first conductive member and forms the conveyance path between the first conductive member and the first conductive member;
An elastic member that electrically connects the upper conveyance guide and the first conductive member;
Sheet transport apparatus according to claim 1, any one of 4, characterized in that it comprises a.