JP2021123459A - Sheet feeder and image reading apparatus - Google Patents

Abstract

To provide a sheet feeder having no possibility to give damages to an original by an original detecting flag (rotary member) arranged on a cover when closing the cover from an open state.SOLUTION: A sheet feeder comprises: a rotation member that is provided on a cover; and stopper means that can be changed between a first state stopping a regulation unit for regulating a position of a sheet placed on a loading unit from moving relatively to the cover and a second state allowing the regulation unit to move relatively to the cover. When the cover is opened from a closed state, a lever allows the stopper means to change from the first state to the second state and moves contacting a rotary member in a manner rotating the rotary member.SELECTED DRAWING: Figure 9

Description

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

In the document transport device (hereinafter referred to as ADF (Auto Document Feeder)), the sheets loaded on the loading section are fed. The image of the fed sheet is read by the image reading unit.

The ADF is provided with a detection means for detecting the presence or absence of a seat in the loading portion. The detection means includes a detection flag as a rotating member that is pushed and rotated by the loaded document. The detection flag is rotatably supported by a cover that opens and closes.

JP-A-2010-64851

When closing the cover, it is preferable that the detection flag (rotating member) arranged on the cover does not damage the seat. In order not to damage the sheet, for example, it is necessary to set restrictions on the arrangement of the detection flag, the shape of the tip, the movable range of the detection flag, and the like. That is, in order to prevent the sheet from being damaged by the detection flag, there may be restrictions on the arrangement of the detection means, and the degree of freedom in designing the detection means is low.

The sheet feeding device of the present invention includes a loading means on which a sheet is loaded, a feeding means for feeding the sheet loaded on the loading means, a cover to be opened and closed, and the loading means provided on the cover. A regulating unit that contacts the tip of the sheet loaded on the cover and regulates the position of the sheet, a rotating member provided on the cover and rotated by the sheet loaded on the loading means, and rotation of the rotating member. A sensor that detects The cover has an interlocking member movably provided on the cover so as to be interlocked with the opening and closing of the cover, and when the cover is opened from the closed state, the interlocking member changes the stopper means from the first state to the first state. It is characterized in that it is changed to two states and moves so as to rotate the rotating member in contact with the rotating member.

According to the present invention, a high degree of freedom in design can be ensured.

Top view of the interior of the feed cover. FIG. 2 is a cross-sectional view of cutting lines A and B indicated in FIG. The figure for demonstrating the position of the release lever. An image forming apparatus including the image reading apparatus according to the present invention. Sectional view of the image reader. Detailed view of the feeding unit. Feeding unit elevating operation diagram. A bird's-eye view of the interior of the feed cover. Detailed interior view of the feed cover. A bird's-eye view of the ADF when the feed cover is opened and closed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the dimensions, materials, shapes, etc. of the components described in the following embodiments should be changed depending on the configuration of the apparatus to which the present invention is applied and various conditions, and the scope of the present invention is limited to them. It is not limited to just.

(Image forming device)
FIG. 4 is a diagram showing an image forming apparatus according to an embodiment of the present invention. In FIG. 4, 201 is a full-color laser beam printer (hereinafter referred to as a printer), 201A is a printer main body which is an image forming apparatus main body, 201B is an image forming part which forms an image on a sheet, and 220 is a fixing part. Reference numeral 301 denotes an image reading device (hereinafter referred to as “reader unit”) that is installed substantially horizontally above the printer body 201A and reads an image of a document, and is used for ejection between the reader unit 301 and the printer body 201A. A paper ejection space S is formed.

The image forming unit 201B is of a 4-drum full-color system, and includes a laser scanner 210 and a process cartridge 211 for forming a toner image of a total of four colors of yellow, magenta, cyan, and black. The process cartridge 211 includes a photoconductor drum 212, a charger 213, and a developer 214 for developing. Further, the image forming unit 201B includes an intermediate transfer unit 201C, a fixing unit 220, and a toner cartridge 215 that supplies toner to the developing device 214 above the process cartridge 211.

The intermediate transfer unit 201C is composed of an intermediate transfer belt 216, a primary transfer roller 219, and a photoconductor drum 212. The intermediate transfer belt 216 includes a drive roller 216a and a tension roller 216b, and rotates in the direction of the arrow in FIG.

At a position facing the drive roller 216a of the intermediate transfer unit 201C, a secondary transfer roller 217 constituting a secondary transfer unit that transfers a color image formed on the intermediate transfer belt 201C to the original P is provided.

The fixing portion 220 is arranged on the upper portion of the secondary transfer roller 217. A first exhaust roller pair 225a and a second exhaust roller pair 225b are arranged on the upper left portion of the fixing portion 220. The double-sided reversing section 201D, which is a reversing paper ejection section, transports the reversing roller pair 222, which is a document reversing transport roller capable of forward / reverse rotation, and the document P having an image formed on one surface to the image forming section 201B again. Etc. are provided.

A feeding device 230 is arranged below the printer 201. The feeding device 230 feeds out the paper documents P loaded on the plurality of cassettes one by one, takes timing with the resist roller 240, and moves toward the secondary transfer unit in order to transfer the image to the paper P which is the recording medium. Paper P is conveyed.

The paper P image-formed by the printer 201 is ejected to the output tray 250 by the first ejection roller pair 225a and the second ejection roller pair 225b. Depending on the size of the discharged paper P, the paper ejection extension tray 251 is appropriately extended to prevent the paper P from falling out of the machine or deteriorating the loading performance of the ejected paper.

(Image reader)
FIG. 5 is a cross-sectional view of the image reading device according to the embodiment of the present invention. As shown in FIG. 5, the image reading device includes a reader unit 301 and a document transporting device (hereinafter, referred to as an ADF (Auto Document Feeder)) 302 for feeding a document as a sheet to the reader unit 301.

[Leader section]
As shown in FIG. 5, the reader unit 301 is provided with a first image reading means 304 for reading a surface image of the document P and an image of the document placed on the platen glass 303. The first image reading means 304 is provided so as to be movable in the arrow T direction (sub-scanning direction) on a rail (not shown) provided inside the reader.

The first image reading means 304 reads the surface image of the document P conveyed by the ADF 302 (document scanning). The first image reading means 304 is a state in which the surface image of the document conveyed by the ADF 302 is stopped at the first position A below the first platen glass 305 provided on the opposite side of the first platen roller 315. Read with.

The first image reading means 304 can read the image of the original placed on the platen glass 303 (original fixed reading). The first image reading means 304 reads the image of the document placed on the platen glass 303 while moving from the first position A to the second position B in the arrow T direction.

(Second image reading means)
Inside the ADF 302 as a sheet feeding device, a second platen glass 309 is provided on the opposite side of the first platen roller 317 in order to read the back surface image of the conveyed document P. The second image reading means 308 is provided at a position corresponding to the second platen glass 309. When the document P is conveyed by the ADF 302, the images on the front and back sides of the document P can be read by the first image reading means 304 and the second image reading means 308. That is, the first image reading means 304 reads the image of the front surface (one side) of the document P conveyed by the ADF 302, and the second image reading means 308 reads the image of the back surface (the other surface) of the document P conveyed by the ADF 302. Read the image.

[ADF]
(Original tray)
As shown in FIG. 5, on the document tray 306 as a loading unit on which the document P is loaded, a pair of width direction regulating plates (not shown) are slidably arranged in the width direction of the document P. The width direction regulating plate regulates the width direction of the document P loaded on the document tray 306 so that the document P can be supplied by aligning the positions in the width direction at the time of document supply.

(Separate feeding section)
Above the document tray 306, a feed cover 101 that can be opened upward is arranged in the ADF 302. The ADF 302 includes a feeding unit 106 that includes a pickup roller 102 as a feeding means and feeds a document. The pickup roller 102 rotates while being in contact with the document P loaded on the document tray 306, and supplies the document P into the ADF 302. The configuration of the feeding unit 106 will be described in detail later.

As shown in FIG. 5, the pickup roller 102 is normally retracted to a position where it does not come into contact with the upper document P, which is the home position. The pickup roller 102 is retracted to the home position so as not to be an obstacle when the user places the document P on the document tray 306. At the start of feeding the document P, the pickup roller 102 lowers and comes into contact with the upper surface of the document P. By rotating the pickup roller 102, the pickup roller 102 is conveyed to the separation nip position of the feed roller pair 103.

The feeding roller pair 103 is composed of a retard roller 104 and a feeding roller 105. The retard roller 104 handles the document P supplied by the pickup roller 102 in cooperation with the feeding roller 105, separates the documents P one by one, and feeds the original P.

(Transport section)
The documents P separated one by one are conveyed to the nip of the drawing roller pair 311 by the feeding roller pair 103. Further, the document P is pulled out by the drawing roller pair 311 and conveyed to the conveying roller pair 312. The manuscript is conveyed to the register roller pair 313 by the transport roller pair 312. The inside of the feeding cover 101 is a guide for guiding the document, and by opening the feeding cover 101, the transport path is exposed and the document staying in the transport path can be removed.

When the tip of the document reaches the register roller pair, the register roller pair 313 is temporarily stopped, and the skew is corrected by abutting the document P at the nip position of the register roller pair 313. The bending that occurs at the tip of the document P that occurs during this operation is accommodated in the loop space 307 inside the feed cover 101.

A first lead roller pair 314, a first platen roller 315, a second lead roller pair 316, a second platen roller 317, and a third lead roller pair 318 are provided in this order downstream of the registration roller pair 313. Downstream of the third lead roller pair 318, a discharge roller pair 319 for discharging the document P after reading the image to the discharge tray 310 is provided.

The original is fed to the surface image reading position on the first platen glass 305 by the first lead roller pair 314. At the surface image reading position, as described above, the first image reading means 304 provided with the reader unit 301 reads the image of the surface of the original while being conveyed. The original P whose surface image has been read is fed onto the second platen glass 309 by the second platen roller 317. Then, the back surface image of the document is read by the second image reading means 308 provided in the ADF 302.

(Feeding unit)
FIG. 6 is a detailed view of the feeding unit 106. The feeding unit 106 includes a pickup roller 102 and a roller holder 107 that holds the feeding roller 105. The feeding unit 106 includes a shutter 109 as a regulating unit that contacts the tip of the document loaded on the loading unit to regulate the position of the document, and a stopper member 110 that contacts the shutter 109 and stops the rotation of the shutter 109. Be prepared. The stopper member 110 is rotatably supported by the roller holder 107. The feeding unit 106 further includes a shutter holder 108 that holds the shutter 109.

As described above, the feeding cover 101 (see FIG. 5) is rotatably supported by the apparatus main body 116 of the ADF. The roller holder 107 constituting the feeding unit 106 is rotatably supported by the feeding cover 101. The shutter 109 and the shutter holder 108 constituting the feeding unit 106 are provided on the feeding cover 101.

Two shutter 109s and two stopper members 110 are arranged so as to sandwich the pickup roller 102. The posture stability when the document P is placed is improved. The roller holder 107 is rotatable with respect to the shutter holder 108 with the feed roller shaft 105a as the center of rotation. The pickup roller 102 moves up and down in accordance with the rotation of the roller holder 107. In this embodiment, the roller holder 107 is composed of two parts for holding the roller end portion.

The roller holder 107 can be held by the roller holding member 111 so as to stand by upward. In this embodiment, a leaf spring member is used as the roller holding member 111.

When the document P is conveyed, a spring clutch (not shown) attached to the roller holder 107 works, and a predetermined torque is applied to the roller holder 107. The torque releases the holding of the roller holder 107 by the roller holding member 111. That is, when the roller holder 107 is separated from the roller holding member 111 and the roller holder 107 rotates, the pick roller 102 comes into contact with the document P. The torque that rotates the roller holder 107 becomes the pressing force for transporting the document P of the pickup roller 102. Further, the pickup roller 102 is rotated via the drive gear on the feed roller shaft 105a to convey the document P.

FIG. 7 is an operation diagram showing the relationship between the feeding unit 106 and the shutter 109. A stopper member 110 for stopping the rotation of the shutter 109 is rotatably provided on the roller holder 107. The shutter holder 108 is provided with a stopper retracting portion 108a that is in contact with the stopper member 110 and swings the stopper member 110.

When the roller holder 107 is positioned above a predetermined position as shown in FIG. 7A, the stopper member 110 attached to the roller holder 107 comes into contact with the shutter contact portion 109a of the shutter 109 to rotate the shutter 109. To lock. In FIG. 7A, the pick roller 102 is separated from the upper surface of the loaded document. In the present embodiment, the stopper member 110 stops the rotation of the shutter 109 so that the shutter 109 does not rotate in the direction in which the shutter 109 is pushed by the document and rotates. As a result, it is possible to prevent the document P from being placed on the transport direction X side from the predetermined position, and to prevent the occurrence of double feeding and feeding failure of the document P. Specifically, the stopper member 110 regulates the position of the document so that the set document does not enter the separation nip. That is, the state of the stopper means including the roller holder 107, the stopper member 110, and the stopper retracting portion 108a shown in FIG. 7A is the first state in which the movement of the feed cover 101 of the shutter 109 is stopped.

When the roller holder 107 is located below as shown in FIG. 7B, the stopper member 110 retracts the position of the stopper member 110 from the shutter 109 by the stopper retracting portion 108a. As a result, the shutter 109 is rotatable because it is not affected by the stopper member 110. Therefore, the document P can be introduced into the nip (conveyance path) of the separation roller pair 301. That is, the state of the stopper means shown in FIG. 7B is the second state that allows the shutter 109 to move.

The original is set in the state shown in FIG. 7A. The state shown in FIG. 7 (b) is obtained in order to feed the manuscript. Then, when the final document is fed, the roller holder 107 receives a driving force and is rotated so that the pick roller 102 moves upward. When the roller holder 107 rotates so that the pick roller 102 moves upward, the roller holder 107 is held by the roller holding member 111 at the position shown in FIG. 7A.

FIG. 8 is a bird's-eye view of the interior of the feed cover 101. FIG. 9 is a detailed view of the vicinity of the release lever 114 of FIG. The feeding unit 106 is removable from the feeding cover 101. The feed roller 105 and the pickup roller 102 rotate by receiving a rotational driving force from a drive row (not shown) via a drive shaft. The feed cover 101 is rotatable (movable) with respect to the device main body 16 (ADF main body) with the rotation shaft 101a as a rotation fulcrum, and can be opened and closed with respect to the device main body 116 (see FIG. 10).

The document detection flag 112 as a rotating member is arranged so as to hang down from the feeding cover 101 into the transport region by its own weight (hereinafter, the position where it hangs down into the transport region by its own weight is referred to as a flag standby position). A sensor 113 for detecting the rotation of the document detection flag 112 is arranged on the feed cover 101. When the document P is placed, the document P is pushed by the placed document and the document detection flag 112 rotates. When the document detection flag 112 rotates, the state of whether or not the sensor 113 is arranged on the feeding cover 101 to block the optical path is switched, and the signals (ON, OFF) from the sensor 113 are changed. The control unit of the image reading device determines whether the signal output from the sensor 113 for detecting the rotation of the document detection flag 112 is ON or OFF, thereby detecting the presence or absence of the document P mounted on the device.

The release lever 114 as an interlocking member is rotatably (movably) provided on the feed cover 101. As shown in FIG. 9, the release lever 114 includes a protrusion 114a in contact with the contact portion 107a of the roller holder. The release lever 114 includes a protrusion 114b in contact with the contact portion 112a of the document detection flag 112. The release lever 114 includes a rotation stopper 114c. The release lever 114 receives a force from the release lever spring 115.

With the feed cover 101 open, the protruding portion A114a of the release lever 114 abuts on the abutting portion 107a of the roller holder 107 and pushes down the abutting portion 107a of the roller holder 107. With the feed cover 101 open, the protruding portion B114b abuts on the abutting portion 112a of the document detection flag 112 and pushes down the abutting portion 112a of the manuscript detection flag. The release lever 114 rotates the roller holder 107 and the document detection flag 112 by a force urged by the release lever spring 115. In this embodiment, a torsion coil spring is used as the release lever spring 115. However, the release lever spring 115 does not have to be operated by another type of spring such as a compression spring or a tension spring, other pressurizing means, or its own weight to use the pressurizing means.

FIG. 10A is a bird's-eye view of the ADF 302 when the feed cover 101 is closed. FIG. 10B is a bird's-eye view of the ADF 302 when the feed cover 101 is opened. The rotation stop portion 114c of the release lever 114 is a portion exposed from the feed cover 101. The rotation stop portion 114c comes into contact with the contact portion (see FIG. 3A) of the apparatus main body 116 when the feeding cover 101 is closed. When the feed cover 101 is open, the rotation stopper 114c and the apparatus main body 116 are separated from each other. In the present embodiment, the contact portion 116a with the rotation stop portion 114c is a part of the frame of the device main body 116, but a dedicated contact component different from the device main body 116 frame may be used.

In the process of closing the feed cover 101, the rotation stop portion 114c of the release lever 114 comes into contact with the contact portion 116a, and the release lever 114 rotates with respect to the feed cover 101 against the urging force from the release lever spring 115. Move. In the process of opening the feed cover 101, the rotation stop portion 114c of the release lever 114 is separated from the contact portion 116a, and the release lever 114 is rotated with respect to the feed cover 101 by the force from the release lever spring 115. In this way, the release lever 114 as an interlocking member is interlocked with the opening and closing of the feed cover 101 so as to move with respect to the feed cover.

FIG. 3A is a diagram showing the position of the release lever 114 when the feed cover 101 is closed. FIG. 3B is a diagram showing the position of the release lever 114 when the feed cover 101 is open. Note that the feed cover 101 is not shown in FIG. As described above, when the feeding cover 101 is closed, the device main body 116 comes into contact with the rotation stop portion 114c of the release lever 114, so that the rotation stop portion 114c of the release lever 114 is held at an upper position. When the feeding cover 101 is opened, the holding of the rotation stop portion 114c of the release lever 114 by the apparatus main body 116 is released, and the release lever 114 rotates so that the rotation stop portion 114c of the release lever 114 moves downward. Hereinafter, the movement of the roller holder 107 and the document detection flag 112 by the release lever 114 will be described.

FIG. 1 is a top view of the interior of the feed cover 101. FIG. 2 is a cross-sectional view of the cutting lines A and B indicated in FIG. 1 when the feed cover 101 is opened and closed. When the feed cover 101 is closed, the release lever 114 is restricted from rotating by the rotation stop portion 114c of the release lever 114 and the device main body 116 coming into contact with each other. When the feed cover 101 is closed, the rotation stop 114c is rotated upward and held, and the release lever 114 does not come into contact with the roller holder 107 or the document detection flag 112. No. Therefore, the lifting operation of the pickup roller 102 and the rotating operation of the document detection flag 112 are not hindered by the release lever 114.

When the feeding cover 101 is opened, the release lever 114 provided on the feeding cover 101 is separated from the device main body 116, so that the rotation stop portion 114c of the release lever 114 and the device main body 116 are separated from each other. When the rotation stop portion 114c of the release lever 114 and the device main body 116 are separated from each other, the rotation restriction of the release lever 114 is released, and the release lever 114 rotates with respect to the feed cover 101. The release lever 114 rotates under the force of the release lever spring 115 until it comes into contact with the release lever receiving portion 101b of the feed cover 101. While the release lever 114 is rotating, the release lever 114 comes into contact with the contact portion 107a of the roller holder and the contact portion 112a of the document detection flag. The roller holder 107 and the document detection flag 112 are forcibly rotated by the force from the release lever 114. When the roller holder 107 is pushed by the release lever 114, the roller holder 107 is released from being held by the roller holding member 111 and rotates by its own weight. The rotated roller holder 107 is held in the lower position. When the roller holder 107 is positioned at a lower position (see FIG. 7B), the rotation lock function (stop function) by the stopper member 110 of the shutter 109 is released and the shutter 109 becomes rotatable as described above. The document detection flag 112 is forcibly rotated from the flag standby position by the release lever 114. In the present embodiment, by being pushed by the release lever 114, it rotates in the clockwise direction of FIG. 2 (the same direction as the direction pushed by the loaded document). Here, the first straight line connecting the rotation center of the feed cover 101 and the rotation center of the document detection flag 112 is used. It is a second straight line connecting the center of rotation of the document detection flag 112 and the tip of the document detection flag 112. The angle formed by the first straight line and the second straight line becomes smaller when the document detection flag 112 is pushed and rotated by the release lever 114 as compared with the case where the document detection flag 112 is located at the flag standby position. When the feeding cover 101 is opened and the rotation stop portion 114c of the release lever 114 is separated from the apparatus main body 116, the following state is obtained. That is, the document detection flag 112 is in a state in which the range of motion of the document detection flag 112 is limited so that the release lever 114 cannot rotate in the counterclockwise direction in FIG. Since the release lever 114 of the document detection flag 112 is limited, in the present embodiment, the document detection flag 112 does not protrude downward from the feed cover 101 when the feed cover 101 is open.

In the process of closing the feed cover 101 from the open state, the shutter 109 rarely damages the document. In the state where the feed cover 101 is opened, the release lever 114 releases the rotation stop by the stopper with respect to the shutter 109, and the shutter 109 is rotatable. Therefore, even if the document P is on the rotation trajectory with the shutter 109 while the feed cover 101 is being rotated in the closing direction, the shutter 109 moves so as to retract with respect to the document P, so that the shutter 109 is moved. This is because there is little possibility that the document P will be pierced.

In the process of closing the feed cover 101 from the open state, the document detection flag 12 is less likely to damage the document. The document detection flag 12 is rotated by the release lever 114 from the flag standby position. Therefore, even if the document P is on the rotation locus of the document detection flag 112 while the feed cover 101 is being rotated in the closing direction, the document detection flag 112 moves so as to retract with respect to the document P. This is because the manuscript P is rarely pierced. When the feed cover 10 is closed, the release lever 114 comes into contact with the contact portion 116a and separates from the document detection flag 112, and the document detection flag 112 tries to rotate toward the flag standby position by its own weight. However, since the release lever 114 comes into contact with the contact portion 116a immediately before the feeding cover 10 is completely closed, the damage to the sheet by the document detection flag 112 is small.

In the above embodiment, the release lever 114 is brought into contact with the roller holder 107. Then, when the feed cover 101 is opened, the release lever 114 pushes the roller holder 107 so that the roller holder 107 is released from being held by the roller holding member 111 (leaf spring member). However, it may be configured as follows, for example. The release lever 114 comes into contact with the roller holding member 111 (leaf spring member) so that the roller holder 107 is released from being held by the roller holding member 111 (leaf spring member) with the opening operation.

A single release lever 114 has been illustrated as an interlocking member. However, the interlocking member may be composed of a plurality of movable members. For example, another member (link member) whose one end is in contact with the lever in contact with the contact portion 116a of the apparatus main body 116 and the document detection flag 112 and the other end is in contact with the roller holding member 111 is movably provided on the feed cover 101. Then, the lever and the link member may be interlocked with the opening and closing of the feed cover 101.

Although the leaf spring member is exemplified as the roller holding member 111, the roller holding member 111 is not limited to the leaf spring, and may be any of rubber, a friction member, and a hook-and-loop fastener.

The shutter holder 108 is rotatably provided on the shutter 109, and the roller holder 107 is rotatably provided on the shutter holder 108. However, for example, it may be configured as follows. That is, a shutter is rotatably provided on the roller holder 107. Then, for example, a stopper member for stopping the rotation of the shutter is provided on the feed cover. In this case, the stopper member can be engaged so that the movement of the shutter can be stopped when the roller holder 107 is located at the upper position, and engages with the shutter when the roller holder 107 is located at the lower position. Arranged so as not to.

According to this embodiment, the release lever 114 forcibly rotates the document detection flag 112 from the flag standby position. Therefore, it is not necessary to set restrictions on the position, orientation, and shape of the document detection flag 112 in the transport region, which improves the degree of freedom in development and design. Further, in the present embodiment, both the roller holder 107 and the document detection flag 112 are operated by the release lever 114 alone. Therefore, in the present embodiment, the number of parts can be reduced and the product cost can be suppressed as compared with the case where the roller holder 107 and the document detection flag 112 are operated by separate members.

By bringing the release lever 114 into contact with the contact portion 116a of the apparatus main body 116, the release lever 114 is rotated with respect to the feed cover 101 as the feed cover 101 opens and closes. Therefore, the release lever 114 is surely rotated. Therefore, it is possible to ensure that the rotation region of the document detection flag 112 is limited to just before the feed cover 101 is completely closed. Since the rotation area of the document detection flag 112 can be reliably limited, there is little risk that the document detection flag 112 will damage the document. In the above description, the effect of rotating the document detection flag 112 by the release lever 114 has been focused on mitigating damage to the document. However, the effect of the manuscript detection flag 112 being rotated by the release lever 114 is not limited to damage to the manuscript. If the document detection flag 112 is rotated by the release lever 114 when the feed cover 101 is opened, the document detection flag 112 can be reliably prevented from protruding from the feed cover 101 (or the amount of protrusion is small). If it is possible to ensure that the document detection flag 112 does not protrude when the feed cover 101 is open, the risk of damage to the document detection flag 112 due to the user inadvertently touching the document detection flag 112 can be reduced.

101 Feeding cover 102 Pickup roller 107 Roller holder 109 Shutter 110 Stopper member 112 Document detection flag 113 Sensor 114 Release lever

Claims (9)

The loading means on which the seats are loaded and
A feeding means for feeding the sheet loaded on the loading means, and a feeding means.
The cover that opens and closes,
A regulation unit provided on the cover and in contact with the tip of the seat loaded on the loading means to regulate the position of the seat.
A rotating member provided on the cover and rotated by a sheet loaded on the loading means, and
A sensor that detects the rotation of the rotating member and
A stopper means provided on the cover and capable of changing between a first state of stopping the movement of the restricting unit with respect to the cover and a second state of allowing the restricting unit to move with respect to the cover.
It has an interlocking member movably provided on the cover so as to interlock with the opening and closing of the cover.
When the cover is opened from the closed state, the interlocking member moves so as to change the stopper means from the first state to the second state and to rotate the rotating member in contact with the rotating member. A sheet feeding device characterized by that. The feeding means includes a roller in contact with the upper surface of the sheet loaded on the loading portion.
The stopper means includes a roller holder that rotatably supports the roller and is rotatably supported by the cover, and a stopper member that is provided on the roller holder and is in contact with the restricting portion to stop the movement of the restricting portion. The sheet feeding device according to claim 1, further comprising. It has a holding means for holding the roller holder in a predetermined position.
When the holding means holds the roller holder at the predetermined position, the stopper means is in the first state.
When the cover is opened, the interlocking member pushes the roller holder so as to release the holding of the holding means with respect to the roller holder, and the holding by the holding means with respect to the roller holder is released, so that the stopper means is released from the first. The sheet feeding device according to claim 2, wherein the sheet feeding device is in two states. The sheet according to claim 3, wherein the feeding roller is separated from the sheet loaded on the loading portion when the cover is closed and the roller holder is located at the predetermined position. Feeding device. The sheet feeding device according to claim 4, wherein when feeding the sheet, the roller holder moves from the predetermined position, the roller comes into contact with the sheet, and the stopper means is in the second state. A main body that rotatably supports the cover and
A contact portion provided on the main body and with which the interlocking member abuts,
With
The claim is characterized in that when the cover is closed from the state in which the cover is opened, the interlocking member is moved with respect to the cover by the contact portion so that the interlocking member is separated from the rotating member. The sheet feeding device according to any one of 1 to 5. The loading means on which the seats are loaded and
A feeding means for feeding the sheet loaded on the loading means, and a feeding means.
A cover that is movably supported by the device body and opens and closes,
A rotating member provided on the cover and rotated by a sheet loaded on the loading means, and
A sensor that detects rotation in the rotating member,
An interlocking member movably provided on the cover so as to interlock with the opening and closing of the cover,
It has a contact portion provided on the main body and with which the interlocking member comes into contact.
When the cover is opened from the closed state, the interlocking member moves with respect to the cover so as to rotate the rotating member.
A sheet feeding device characterized in that when the cover is closed, the interlocking member moves with respect to the cover so as to move away from the rotating member by coming into contact with the contact portion. A urging means for urging the interlocking member is provided.
6. Sheet feeder. The sheet feeding device according to any one of claims 1 to 8.
An image reading device comprising a reading means for reading an image of a sheet fed by the sheet feeding device.

Images