JP6922022B2 - Image reader and image forming device - Google Patents

Description

The present invention relates to an image reading device for reading an image of a sheet and an image forming device including the same.

Generally, an image reading device including an automatic document feeding device (Automatic Document Feeder, hereinafter referred to as ADF) that automatically feeds a document and a reading unit that reads an image of a sheet fed by the ADF is known. Has been done. The ADF is supported by the reading unit so as to be openable and closable and movable in the vertical direction.

The user can read the image of the original by placing the original on the platen glass provided on the upper surface of the reading unit with the ADF open (fixed reading). Further, since the ADF can be shifted upward with respect to the scanning unit, the document can be pressed by the ADF even when a thick document is placed on the platen glass, and the document is displaced during image scanning. Can be prevented.

Conventionally, an image processing device having a holder member for electrically connecting an ADF and a main unit such as a copier provided below a reading unit with a flat cable and covering the flat cable in a bent state has been proposed. (See Patent Document 1). The holder member slides on the reading unit as the ADF moves in the vertical direction, and when the ADF is in the lower position, the bottom of the holder member is in contact with the reading unit.

Japanese Unexamined Patent Publication No. 2011-77774

In the image processing apparatus described in Patent Document 1, the flat cable is communicated with the opening formed at the bottom of the holder member, and the flat cable is wired to the main unit. However, for example, when the image processing device can be attached to a plurality of types of main units having different connection positions of the flat cables, a space for running the flat cables is required in the reading unit. In order to secure a space for the flat cable to crawl in the reading unit without increasing the size of the image processing device, it was necessary to improve the configuration of the holder member.

Therefore, an object of the present invention is to provide an image reading device having an improved configuration of a cover member.

According to the present invention, in an image reading device, a scanning unit having a document table on which a document is placed and a first reading unit for reading an image of a document placed on the document table, and above the scanning unit . A document transport unit that is arranged and opens and closes around a rotation axis, and is a document transport unit for transporting a document toward the first reading unit so that the surface image of the document can be read by the first reading unit. To transmit to the control unit the unit, the second reading unit that is housed inside the document transport unit and reads the back image of the document to be transported, and the image signal corresponding to the image read by the second reading unit. Cable, a cover member provided on the document transport unit so as to extend downward and to which the cable is wired inside, and an opening provided on the upper surface of the reading unit through which the cable and the cover member pass inside. than said platen is disposed so as to protrude upward, and a cover member and the overlapping portion in the vertical direction, the conveyance unit, the up and down with the pivot shaft with respect to the reading unit It is displaceable in the directions, the cover member, wherein the document transport unit with the vertical displacement is configured to displace the inner side of the opening in the vertical direction, and characterized in that do.

According to the present invention, the configuration of the cover member can be improved.

The whole schematic which shows the printer which concerns on 1st Embodiment. A side sectional view showing an image reader. It is a rear view which shows the hinge mechanism, (a) shows the state which ADF is positioned in the lower position, (b) shows the state which ADF is located in the upper position. It is sectional drawing which shows the wiring path of a flat cable and a signal line, (a) shows the state which ADF is located in the lower position, (b) shows the state which ADF is located in the upper position. FIG. 3A is a cross-sectional view taken along the line EE showing the configuration of the duct, in which the ADF is located at the lower position in FIG. The state (c) shows the state in which the ADF is located in the upper position. It is a figure which shows the structure around the lid part, (a) is the state which ADF is closed, (b) is the state which ADF is opened halfway, (c) is the state which ADF is opened to the maximum opening. Indicates the state of being. It is a figure which shows the structure of the duct which concerns on 2nd Embodiment, (a) is the state which ADF is located in the lower position, (b) is the state where the 1st duct and the 2nd duct are in contact with each other. , (C) indicate a state in which the ADF is located in the upper position. It is a figure which shows the structure of the lid part, (a) shows the state which ADF is closed, (b) shows the state which ADF is opened halfway.

<First Embodiment>
Hereinafter, the image reading device and the image forming device according to the present disclosure will be described with reference to the drawings. The dimensions, materials, shapes, relative arrangements, etc. of the components described in the following embodiments are not intended to limit the scope of application of the present technology to those unless otherwise specified. ..

[Outline configuration of printer]
First, a schematic configuration of the printer 101 as an image forming apparatus will be described with reference to FIG. As shown in FIG. 1, the printer 101 includes a printer main body 101A (image forming unit) and an image reading device 103. The image reading device 103 arranged above the printer main body 101A includes a reading unit 30 and an ADF 1 as described in detail later, and optically scans the document D to read image information. The manuscript D is paper such as paper and envelopes, plastic film such as sheets for overhead projectors (OHT), and sheets such as cloth. The image information converted into an electric signal by the image reading device 103 is transferred to the control unit 122 provided in the printer main body 101A. In the present embodiment, the front side of the device when standing facing the operation panel (not shown) for operating the printer 101 is defined as the front side, and the back side of the device is defined as the back side.

The printer main body 101A has an image forming unit 119 that forms an image on the sheet P that is a recording medium, a sheet feeding unit 34 that feeds the sheet P to the image forming unit 119, and a manual feeding unit 117. ing. The sheet feeding unit 34 includes sheet storage units 137a, 137b, 137c, and 137d capable of storing sheets of different sizes. The sheets stored in each sheet storage unit are fed out by the pickup roller 32, separated one by one by the feed roller 33a and the retard roller 33b, and delivered to the corresponding transfer roller pair 120. Then, the sheet P is transferred to the registration roller pair 136 by being sequentially delivered to the plurality of transfer roller pairs 120 arranged along the sheet transfer path.

The sheet P placed on the manual feed tray 137e of the manual feed feed unit 117 by the user is fed to the inside of the printer main body 101A by the feed roller 138 and conveyed to the registration roller pair 136. The registration roller pair 136 stops the tip of the sheet P to correct the skew, and restarts the transfer of the sheet P in accordance with the progress of the image forming operation, which is the process of forming the toner image by the image forming unit 119.

The image forming unit 119 that forms an image on the sheet P is an electrophotographic unit including a photosensitive drum 121 that is a photoconductor. The photosensitive drum 121 is rotatable along the transport direction of the sheet P, and around the photosensitive drum 121, a charging device 118, an exposure device 123, a developing device 124, a transfer charging device 125, a separation charging device 126, and a cleaner 127 are provided. Is placed. The charger 118 uniformly charges the surface of the photosensitive drum 121, and the exposure device 123 exposes the photosensitive drum 121 based on the image information input from the image reading device 103 or the like to form an electrostatic latent image on the drum. do.

The developer 124 contains a two-component developer containing toner and a carrier, and develops an electrostatic latent image into a toner image by supplying charged toner to the photosensitive drum 121. The toner image supported on the photosensitive drum 121 is transferred to the sheet P conveyed from the registration roller pair 136 by the bias electric field formed by the transfer charger 125. The sheet P to which the toner image is transferred is separated from the photosensitive drum 121 by the bias electric field formed by the separation charger, and is conveyed toward the fixing portion 129 by the pre-fixing conveying portion 128. Adhesions such as transfer residual toner remaining on the photosensitive drum 121 without being transferred to the sheet P are removed by the cleaner 127, and the photosensitive drum 121 prepares for the next image-forming operation.

The sheet P conveyed to the fixing portion 129 is sandwiched between roller pairs and heated while being pressurized, and the image is fixed by melting and fixing the toner. When the image output is completed, the sheet P from which the fixed image is obtained is discharged to the discharge tray 130 protruding outward from the printer main body 101A via the discharge roller pair 40. When an image is formed on the back surface of the sheet P in double-sided printing, the front surface and the back surface of the sheet P that has passed through the fixing portion 129 are exchanged by the reversing portion 139, and the sheet P is conveyed to the registration roller pair 136 by the double-sided conveying portion 140. NS. Then, the sheet P whose image is formed again by the image forming unit 119 is discharged to the discharge tray 130.

[Image reader]
Next, the configuration of the image reading device 103 will be described with reference to FIG. As shown in FIG. 2, the image reading device 103 is composed of a reading unit 30 and an ADF1 which is a transport unit arranged above the reading unit 30. Further, the image reading device 103 includes a first reading unit 151 arranged in the reading unit 30, and a second reading unit 201 arranged in the ADF1.

The first reading unit 151 is held by the first holder 301, and can read the image of the first surface of the document D through the first platen glass 152 (transparent part). The second reading unit 201 is held by the second holder 302, and can read the image of the second surface opposite to the first surface of the document D through the second platen glass 202. The first surface in the present embodiment is the lower surface of the document D in the double-sided reading unit DR, and the second surface is the upper surface of the document D in the double-sided reading unit DR. The first reading unit 151 and the second reading unit 201 do not always perform simultaneous reading on both sides, and can read only one side.

The first reading unit 151 and the second reading unit 201 are composed of a close contact image sensor (Contact Image Sensor, hereinafter referred to as CIS) which is a scanning device of a 1x optical system. The first reading unit 151 and the second reading unit 201 include a light source composed of LED arrays arranged in the main scanning direction orthogonal to the transport direction of the document D, and a plurality of light receiving elements also arranged in the main scanning direction. I have. The reflected light emitted from the LED array and reflected by the document D is imaged on each light receiving element via the lens and photoelectrically converted by the light receiving element.

The reading unit 30 is fixed to the upper surface of the printer main body 101A (see FIG. 1). As shown in FIG. 2, a flatbed type document base 31 (mounting portion) on which the document D can be placed is arranged on the upper surface of the reading unit 30. The first holder 301 holding the first reading unit 151 can move from the position P1 to the position P2 shown in FIG. 2 in the sub-scanning direction.

As shown in FIG. 3A, two hinge mechanisms 11 (support portions) are provided on the back side of the image reading device 103, and the hinge mechanism 11 moves in the vertical direction with respect to the reading unit 30. It is supported as much as possible. Further, the hinge mechanism 11 rotatably supports the rotation shaft 1a of the ADF1 at the upper portion. That is, the hinge mechanism 11 supports the ADF1 with respect to the reading unit 30 so as to be movable in the vertical direction and openable / closable between the upper position and the lower position. For example, as shown in FIG. 3B, when a thick document D is placed on the platen 31, the ADF1 is displaced upward with respect to the reading unit 30 together with the hinge mechanism 11, and is rotated in this state. It rotates around the moving shaft 1a and is closed. The position where the ADF1 is most displaced upward with respect to the reading unit is defined as the upper position (see FIG. 5C), and the position where the ADF1 is displaced most downward is defined as the lower position (see FIG. 5A).

In addition to the second reading unit 201, the ADF 1 includes a document feeding tray 2, a document transporting unit 25, and a pressure plate unit 26, as shown in FIG. The document feeding tray 2 supports the document D placed by the user. The pressure plate portion 26 is provided on the lower surface of the ADF 1 and presses the sheet placed on the platen 31 from above. The ADF1 has a document transport path T formed therein, and feeds the document D placed on the document feed tray 2 to the double-sided reading unit DR via the document transfer path T.

ADF1 will be described in detail. The ADF1 has a pickup roller 4, a feed roller 5, a retard roller 6, a registration roller pair 7, a transport roller pair 8 and 9, and a discharge roller pair 10 in a sheet transport direction (sheet transport direction). It is held in this order along (indicated by arrows in the figure). The pickup roller 4 is movable in the vertical direction with respect to the upper surface of the document feeding tray 2, and comes into contact with the document D on the document feeding tray 2 to start feeding. The feed roller 5 conveys the document D received from the pickup roller 4 toward the downstream in the conveying direction. The retard roller 6 is pressure-contacted with the feed roller 5, and a rotational drive in a direction opposite to the transport direction is input via a torque limiter, and the document D transported by the feed roller 5 is separated one by one.

The registration roller pair 7 receives the tip of the document D conveyed by the feed roller 5 in a state where the rotation is stopped, and bends the document D to correct the skew. Further, the registration roller pair 7 conveys the document D with the skew corrected through the bent portion of the document transfer path T, and delivers the document D to the transfer roller pair 8. The transport roller pair 8 feeds the document D to the double-sided reading unit DR and delivers it to the transport roller pair 9 on the downstream side. At this time, the image of the document D is read by the first reading unit 151 and the second reading unit 201. The transport roller pair 9 delivers the document D that has passed through the double-sided reading unit DR to the discharge roller pair 10. The ejection roller pair 10 ejects the document D to the document ejection unit 3.

The image reading device 103 configured in this way has a scanning mode for scanning the original image while feeding the original D by the ADF1 and a fixed reading mode for scanning the original placed on the platen 31. Image information is read from the document D. The scanning mode is selected when the apparatus detects the document D placed on the document feeding tray 2, or when the user explicitly instructs the printer body 101A by the operation panel or the like. In this case, with the first reading unit 151 at the position P1, the ADF1 feeds the document D toward the double-sided reading unit DR one by one. Then, in the case of double-sided simultaneous reading, both the first reading unit 151 and the second reading unit 201, and in the case of single-sided scanning, one of them irradiates the document D with scanning light to scan. The image information converted into an electric signal by the light receiving element is transferred to the control unit 122 of the printer main body 101A.

On the other hand, the fixed reading mode is selected when the apparatus detects the document D placed on the document table 31 or when the user explicitly instructs the printer body 101A by the operation panel or the like. In the fixed reading mode, the user first opens the ADF1 to place the original on the platen 31, and closes the ADF1 to sandwich the original between the platen 31 and the platen 26. Then, the first reading unit 151 irradiates light while moving between the positions P3 and P2 along the document table 31 to scan the document D placed on the document table 31. The image information converted into an electric signal by the light receiving element of the first reading unit 151 is transferred to the control unit 122 of the printer main body 101A.

As shown in FIG. 4, a flat cable F is used for the signal line that sends the image signal read by the second reading unit 201 to the control unit 122. In addition, the ADF1 has a signal line C that transmits signals and electric power to a motor or the like, and these signal lines pass through the same path in the reading unit 30 for ease of assembly workability and maintainability, and the printer. It is desirable that it be connected to the control unit 122 in the main body 101A. Further, since the flat cable F may have noise on the signal due to the influence of static electricity or the like, it is necessary to prevent the flat cable F from being exposed to the outside. Even for the signal line C having more coating than the flat cable F, it is desirable to wire the signal line C inside the reading unit 30 and the printer main body 101A so that the signal line C is not broken or damaged by an external force such as a user operation.

[Wiring route]
Next, the wiring paths of the flat cable F and the signal line C will be described. As shown in FIGS. 4A and 4B, the ADF1 has a cable guide 16 (holding portion) fixed to the frame 14 of the ADF1 and holding the flat cable F and the signal line C in a bent state. There is. A duct 13 (cover portion) that covers the flat cable F and the signal line C is rotatably supported on the frame 14 between the ADF 1 and the reading unit 30.

The flat cable F that sends the electric signal of the second reading unit 201 to the control unit 122 is bent a plurality of times in the ADF 1 and enters the reading unit 30 via the cable guide 16 and the duct 13. Then, the flat cable F is wired in the width direction orthogonal to the sheet transport direction in the space R below the duct 13 and inside the reading unit 30, and heads downward toward the printer main body 101A. Since the space R is formed in the reading unit 30, the flat cable F can be wired in the width direction in the space R, and the image reading device is provided for a plurality of types of printers having different connection positions of the flat cables F. 103 can be attached.

Further, the signal line C such as the motor, the sensor, and the USB cable also enters the reading unit 30 via the cable guide 16 and the duct 13, and is wired toward the printer main body 1A. The signal line C is wound with a tube or thickened so as not to be broken due to repeated opening and closing of the ADF1. Therefore, the signal line C has a larger bendable radius than the flat cable F.

Further, when the document D is read in the fixed reading mode, the ADF1 moves in the vertical direction according to the thickness of the document D placed on the document table 31. Therefore, the flat cable F and the signal line C need to have an extra length corresponding to the amount that the ADF1 can move upward. Therefore, as shown in FIG. 5A, the cable guide 16 connects the flat cable F and the signal line C (hereinafter referred to as the bundled wire BW) in the horizontal direction, and bends the bundled wire BW. There is. The bundled wire BW has a plurality of wirings having different bendable radii.

[Duct configuration]
Next, the configuration of the duct 13 will be described. As shown in FIG. 5A, the duct 13 has a main body portion 12 and a lid portion 12f. The main body 12 has a first duct 12i rotatably supported by the frame 14 and a second duct 12o movably provided in the vertical direction with respect to the reading unit 30. The first duct 12i and the second duct 12o are provided so as to overlap each other on the inner side or the outer side on a plane orthogonal to the vertical direction, and in the present embodiment, the first duct 12i is provided inside the second duct 12o. Has been done. That is, the first duct 12i and the second duct 12o have a two-layer structure that overlaps in the vertical direction.

The first duct 12i and the second duct 12o are formed in a substantially cylindrical shape, and an outer flange portion 41 (contact portion) extending radially outward is formed at the lower end of the first duct 12i. An inner flange portion 42 extending radially inward is formed at the upper end of the second duct 12o, and a retaining portion 43 extending radially outward is formed at the lower end of the second duct 12o. Further, the reading unit 30 is provided with a stopper 17 (regulating portion) that comes into contact with the retaining portion 43 of the second duct 12o and restricts the downward movement of the second duct 12o.

When the ADF1 is located at the lower position, the outer flange portion 41 of the first duct 12i is separated from the inner flange portion 42 of the second duct 12o, as shown in FIG. 5A. At this time, the retaining portion 43 of the second duct 12o is in contact with the stopper 17, and the outer flange portion 41 of the first duct 12i is located at substantially the same position as the stopper 17 in the vertical direction.

When the ADF1 is moved upward by the user, the outer flange portion 41 of the first duct 12i comes into contact with the inner flange portion 42 of the second duct 12o, as shown in FIG. 5 (b). That is, the outer flange portion 41 comes into contact with the inner flange portion 42 of the second duct 12o while the ADF1 is moving from the lower position to the upper position. Further, when the ADF1 is moved upward by the user, as shown in FIG. 5C, the inner flange portion 42 is lifted by the outer flange portion 41, so that the second duct 12o is integrated with the first duct 12i. And move upwards. Then, when the ADF1 is positioned at the upper position, the retaining portion 43 of the second duct 12o comes into contact with the inner peripheral surface of the rear cover 35 of the reading unit 30, and the second duct 12o is retracted from the reading unit 30. At this time, the lower end of the first duct 12i is located above the reading unit 30, but because the second duct 12o is provided between the first duct 12i and the reading unit 30. The bundled wire BW is not exposed to the outside.

When the ADF1 moves from the upper position to the lower position, the second duct 12o moves downward together with the first duct 12i, then hits the stopper 17, and then only the first duct 12i moves downward together with the ADF1. Moving.

In this way, in the duct 13, the first duct 12i and the second duct 12o expand and contract according to the ascending / descending operation of the ADF1. Then, as shown in FIGS. 5A and 5C, assuming that the total length of the duct 13 in the vertical direction when the ADF1 is located at the lower position and the upper position is the total length L1 and the total length L2, respectively. The total length L2 is longer than the total length L1 (L2> L1). Further, assuming that the stroke amount of the first duct 12i with respect to the second duct 12o is the stroke Si and the stroke amount of the second duct 12o with respect to the reading unit 30 is the stroke So, the stroke Si is set to be equal to or greater than the stroke So (Si ≧ So). ).

That is, the duct 13 has a total length L2 sufficient to surely protect the bundled wire BW even when the ADF1 is in the upper position, and is contracted to have the total length L1 when the ADF1 is in the lower position to save space. It is possible. Further, when the ADF1 is located at the lower position, the movement of the second duct 12o in the downward direction is restricted by the stopper 17, and the length of the first duct 12i is set to substantially the same level as the stopper 17. .. As a result, as described above, the space R in which the bundled wire BW can be wired in the width direction is secured, and the image reading device 103 can be attached to a plurality of types of printers having different connecting positions of the bundled wire BW. .. Further, since the stroke Si of the first duct 12i is set to be equal to or greater than the stroke So of the second duct 12o, a larger space R, which is a space below the second duct 12o, can be secured.

[Structure around the lid]
As shown in FIGS. 4A and 6A, the ADF1 is rotatable about the rotation fulcrum 11c, and the first duct 12i is arranged substantially concentrically with the rotation fulcrum 11c. It can rotate around the rotation center 12c (see FIG. 4B). By the way, an open space 50 (see FIG. 3) is provided between the exterior cover 15 of the closed ADF1 and the first duct 12i so as not to interfere with the first duct 12i when the ADF1 opens. For example, when the number of mounted parts of the ADF1 increases and the weight increases by providing the second reading unit 201, it is necessary to increase the spring pressure of the hinge mechanism 11 or add a damper function. Then, the hinge mechanism 11 is enlarged, the rotation fulcrum 11c is located higher and inward with respect to the reading unit 30, and the rotation center 12c of the first duct 12i is also displaced upward. When the rotation fulcrum 11c is displaced upward and inward inside the ADF 1, it is necessary to provide a larger open space 50.

Then, when the ADF1 is opened by the user, the fixed portion on the ADF1 side of the bundled wire BW and the fixed portion on the reading unit 30 side come close to each other, so that the bundled wire BW swells to the back side of the image reading device 103. For this reason, the bundled wire BW that swells to the back side may be sandwiched between the exterior cover 15 and the first duct 12i while entering the open space 50, and the bundled wire BW may be disconnected. ..

Therefore, in the present embodiment, the first duct 12i is provided with a lid portion 12f that is rotatably supported. The lid portion 12f is formed of a rigid body that can rotate around the rotation fulcrum 13c and moves with the opening / closing operation of the ADF1. The rotation fulcrum 13c (support portion) of the lid portion 12f is located below the rotation fulcrum 11c of the ADF1.

The cable guide 16 is provided with a pressing portion 131 capable of pressing the lid portion 12f. Further, the exterior cover 15 is formed with a first regulating surface 132 that regulates the movement of the lid portion 12f in the opening direction, and the first duct 12i is formed with a second regulating surface 133 that regulates the movement of the lid portion 12f in the closing direction. Is formed. The first regulation surface 132 and the second regulation surface 133 constitute a regulation portion 134 that regulates the rotation range of the lid portion 12f, and the pressing portion 131 and the regulation portion 134 are interlocked with the opening / closing operation of the ADF1. The interlocking portion 135 for rotating the lid portion 12f is configured.

When the ADF1 is closed, as shown in FIG. 6A, the lid portion 12f is positioned at the closed position by the first regulation surface 132 and the second regulation surface 133. At this time, as shown in FIG. 6A, the open space 50 (see FIG. 3) is covered with the lid portion 12f so that the bundled wire BW is not exposed to the outside. When the ADF1 is opened by the user, as shown in FIG. 6B, the pressing portion 131 presses the lid portion 12f, and the lid portion 12f is opened as the ADF1 is opened. Then, when the ADF1 is opened to the maximum opening degree, as shown in FIG. 6C, the lid portion 12f is opened by its own weight or by being pressed by the bundled wire BW, and is brought into the open position by the first regulating surface 132. Positioned.

Further, when the ADF1 is closed from the position shown in FIG. 6C to the position shown in FIG. 6A, the lid portion 12f located at the open position is pressed by the first regulating surface 132 to close the ADF1. It is linked to the operation. Then, as shown in FIG. 6A, when the ADF1 is closed, the lid portion 12f is positioned at the closed position by the second regulating surface 133.

As described above, the lid portion 12f is interlocked by the interlocking portion 135 so that the gap between the lid portion 12f and the ADF1 is within a predetermined amount when the ADF1 is opened and closed. Further, since the rotation fulcrum 13c of the lid portion 12f is located below the rotation fulcrum 11c of the ADF1, even if a large open space 50 is provided to secure the rotation amount of the ADF1, the bundled wire BW is provided. It can be reliably protected by the lid portion 12f. That is, during the opening / closing operation of the ADF1, the bundled wire BW does not enter the open space and is sandwiched between the exterior cover 15 and the first duct 12i, so that the bundled wire BW can be prevented from being broken. Further, the user cannot access the bundled wire BW through the open space 50, the bundled wire BW and the user can be protected, and the appearance can be improved.

<Second Embodiment>
Next, the second embodiment of the present invention will be described, but the second embodiment is a modification of the configuration of the duct 13 of the first embodiment. Therefore, the same configuration as that of the first embodiment will be described by omitting the illustration or adding the same reference numerals to the drawings. As shown in FIG. 7A, the duct 113 (cover portion) includes a main body portion 112 having a first duct 112i (first cover member) and a second duct 112o (second cover member). There is. The first duct 112i and the second duct 112o are provided so as to overlap each other on the inner side or the outer side on a plane orthogonal to the vertical direction, and in the present embodiment, the first duct 112i is provided on the outer side of the second duct 112o. Has been done. That is, the first duct 112i and the second duct 112o have a two-layer structure that overlaps in the vertical direction.

The first duct 112i and the second duct 112o are formed in a substantially cylindrical shape, and an inner flange portion 141 (contact portion) extending inward in the radial direction is formed at the lower end of the first duct 112i. An outer flange portion 142 extending radially outward is formed at the upper end of the second duct 112o, and a retaining portion 43 extending radially outward is formed at the lower end of the second duct 112o. Further, the reading unit 30 is provided with a stopper 17 (regulating portion) that comes into contact with the retaining portion 43 of the second duct 112o and restricts the downward movement of the second duct 112o.

When the ADF1 is located at the lower position, the inner flange portion 141 of the first duct 112i is separated from the outer flange portion 142 of the second duct 112o, as shown in FIG. 7A. At this time, the retaining portion 43 of the second duct 112o is in contact with the stopper 17.

When the ADF1 is moved upward by the user, the inner flange portion 141 of the first duct 112i comes into contact with the outer flange portion 142 of the second duct 112o, as shown in FIG. 7B. That is, the inner flange portion 141 comes into contact with the outer flange portion 142 of the second duct 112o while the ADF1 is moving from the lower position to the upper position. Further, when the ADF1 is moved upward by the user, as shown in FIG. 7C, the outer flange portion 142 is lifted by the inner flange portion 141, so that the second duct 112o is integrated with the first duct 112i. And move upwards. Then, when the ADF1 is positioned at the upper position, the retaining portion 43 of the second duct 112o comes into contact with the inner peripheral surface of the rear cover 35 of the reading unit 30, and the second duct 112o is retracted from the reading unit 30. The lower end of the first duct 112i is located above the reading unit 30, but since the second duct 112o is provided between the first duct 112i and the reading unit 30, it is inside the duct 113. The bundled wire BW (see FIG. 8) housed in is not exposed to the outside.

When the ADF1 moves from the upper position to the lower position, the second duct 112o moves downward together with the first duct 112i, then hits the stopper 17, and then only the first duct 112i moves downward together with the ADF1. Moving. Since the change in the total length of the duct 113 and the setting of the strokes of the first duct 112i and the second duct 112o due to the vertical movement of the ADF1 are the same as those in the first embodiment, the description thereof will be omitted.

By the way, the displacement amount of the bundled wire BW that bends with the vertical movement of the ADF1 is larger in the first duct 112i than in the second duct 112o. In the present embodiment, the first duct 112i and the second duct 112o are engaged inside the first duct 112i, and the cross-sectional area SL of the inner space of the first duct 112i is a disconnection of the inner space of the second duct 112o. It is configured to be larger than the area SS. Therefore, the bundled wire BW can be greatly bent in the first duct 112i, and damage to the bundled wire BW can be reduced. Further, as in the first embodiment, a space R in which the bundled wire BW can be wired in the width direction is secured below the second duct 112o, and a plurality of types of printer main bodies having different connecting positions of the bundled wire BW are secured. The image reading device 103 can be attached to the device.

As shown in FIG. 8A, the duct 113 has a lid portion 112f that is fixed to the first duct 112i by a fixture 113c (support portion). The lid portion 112f is made of an elastic body such as a rubber material or a sheet material. The fixture 113c is arranged below the rotation fulcrum 11c of the ADF1 and can widen the ADF1.

When the ADF1 is opened, as shown in FIG. 8B, the bundled wire BW swells toward the back of the device and presses the lid portion 112f. When the ADF1 is closed, the lid portion 112f returns to its original position by its own elastic force. That is, the lid portion 112f moves while protecting the bundled wire BW in conjunction with the opening / closing operation of the ADF1. As a result, the bundled wire BW is not exposed to the outside from the open space (see FIG. 3), and the bundled wire BW can be prevented from being broken. Further, the user cannot access the bundled wire BW through the open space 50, the bundled wire BW and the user can be protected, and the appearance can be improved.

In the first and second embodiments, the main body of the duct has a two-layer structure, but the duct may have three or more layers. Further, the main body of the duct is formed in a cylindrical shape, but the present invention is not limited to this, and for example, a square cylinder shape or another cross-sectional shape may be used.

Further, in the first and second embodiments, the position of the lower limit of the second duct is defined by providing the stopper 17, but the present invention is not limited to this. For example, instead of providing the stopper 17, an urging portion such as a spring that urges the second duct with respect to the first duct may be provided. In this case, when the ADF1 is moved from the lower position to the upper position, the first duct and the second duct move upward integrally, and after the retaining portion of the second duct comes into contact with the rear cover of the reading unit. , The first duct moves with respect to the second duct against the urging force of the urging portion.

Further, in the first and second embodiments, the first reading unit 151 and the second reading unit 201 are not limited to CIS, and CCD (Charge Coupled Device) may be used. Further, the image reading device 103 can be mounted on various image forming devices such as a copier, a facsimile, a printer, and a multifunction device, and can also be used alone.

11: Support part (hinge mechanism) / 11c: Rotation fulcrum / 12: Main body part / 12c: Rotation fulcrum / 12f: Lid part / 12i: First cover member (first duct) / 12o: Second cover member ( 2nd duct) / 13,113: Cover part (duct) / 13c, 113c: Support part (rotation center, fixture) / 15: Exterior cover / 16: Holding part (cable guide) / 17: Regulatory part (stopper) ) / 30: Reading unit / 31: Mounting part (document stand) / 41,141: Contact part (outer flange part, inner flange part) / 101: Image forming apparatus (printer) / 101A: Image forming unit (printer) Main body) / 103: Image reader / 131: Pressing unit / 135: Interlocking unit / 151: Reading unit, 1st reading unit / 152: Transparent unit (1st platen glass) / 201: 2nd reading unit / BW: Bundle Line / D: Sheet (original) / L1, L2: Overall length / So, Si: Stroke / SS, SL: Cross-sectional area

Claims (7)

A platen on which an original is placed, a front Symbol first reading unit for reading an image of a document placed on the document table, a reading unit having,
A document transport unit that is arranged above the scanning unit and opens and closes around a rotation axis, and the document is directed toward the first scanning unit in order for the first scanning unit to read the surface image of the document. A document transport unit for transporting,
A second reading unit that is housed inside the document transport unit and reads the back side image of the transported document.
A cable for transmitting an image signal corresponding to the image read by the second reading unit to the control unit, and
A cover member provided on the document transport unit so as to extend downward and to which the cable is wired inside .
An opening provided on the upper surface of the reading unit through which the cable and the cover member pass through,
A portion that is arranged so as to project upward from the platen and overlaps with the cover member in the vertical direction is provided.
The conveyance unit is displaceably configured to the vertical direction together with the pivot shaft with respect to the reading unit,
Said cover member, with the said vertical displacement of said document transport unit is configured to displace the inner side of the opening in the vertical direction,
An image reader characterized by this. Further provided with a hinge mechanism for supporting the rotating shaft,
The cover member and the hinge mechanism are arranged at positions arranged side by side in the axial direction of the rotation shaft.
The image reading device according to claim 1. The cover member is rotatably supported by the document transport unit.
The image reading device according to claim 1 or 2. A signal line for transmitting signals and electric power to a motor provided inside the document transport unit is further provided.
The signal line is wired in the cover member together with the cable.
The image reading device according to any one of claims 1 to 3. The cable is a flat cable,
The image reading device according to any one of claims 1 to 4. The image reading device can execute a scanning mode in which an image of a document is read while the document is being conveyed by the document transport unit, and a fixed reading mode in which an image of a document placed on the platen is read.
The first reading unit is
In the scanning mode, the image of the document transported by the document transport unit is read with the first scanning unit in the first position.
In the fixed reading mode, the image of the document placed on the platen is read while moving along the platen between the second position and the third position, which are different from the first position. ,
The image reading device according to any one of claims 1 to 5 , wherein the image reading device is characterized. The image reading device according to any one of claims 1 to 6.
It comprises an image forming unit that forms an image on a sheet.
An image forming apparatus characterized in that.

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