JP2017145114A - Supply device, reading device, and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that prevents manuscript setting failure even when a pickup roller falls.SOLUTION: A supply device includes: a pickup roller which contacts with a sheet on a tray to feed the sheet; detection means which detects a situation where the sheet is placed on the tray; driving means which drives the pickup roller so that the pickup roller moves from a contact position, in which the pickup roller contacts with the sheet, to a separation position, in which the pickup roller separates from the sheet on the basis of a detection result of the detection means; and determination means which determines whether or not the sheet can be supplied on the basis of the detection result of the detection means after a predetermined time elapses after the driving means is driven.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a supply device, a reading device, and a control method.

  As an automatic document feeder in the document reading device, for example, there is a device described in Patent Document 1 provided in an image forming apparatus such as a copying machine or a facsimile. In this automatic document feeder, only when the pickup roller (feeding roller) is raised, the stopper member that is in contact with the leading edge of the document regulates the movement of the document and sets the document at a position where the pickup roller can be fed. It is configured.

  Some automatic document feeders include a document set sensor that detects that a document has been set. As will be described in detail later, the document set sensor rotates by contacting the leading end of the document and detects that the document has been set. In such an automatic document feeder, for example, when the user gives an impact that aligns the documents near the cover above the pickup roller, the document set sensor may rotate simultaneously with the fall of the pickup roller. Assuming such a case, in the conventional automatic document feeder, as a countermeasure for the chattering of the sensor, even if the ON of the document set sensor is detected, if the ON signal is not obtained again after a predetermined time has elapsed, the document set sensor Is not confirmed (see FIG. 6). The picked-up roller that has fallen is lifted to the standby position after the document setting sensor is turned on.

JP 2002-179274 A

  In the automatic document feeder, due to this chattering countermeasure, it is necessary to wait for a predetermined time until the dropped pickup roller is lifted, and the user may set the document while the pickup roller is falling. As described above, when the user's original setting operation is fast, the stopper member that operates at the standby position of the pickup roller cannot restrict the movement of the original. Therefore, document setting failure occurs, causing trouble such as double feeding. Therefore, various countermeasures against the drop of the pickup roller have been desired.

  An object of the present invention is to provide a technique for preventing a document set failure even when a pickup roller falls.

  According to the present invention, for example, a pickup roller that contacts a sheet on the tray and feeds the sheet, a detection unit that detects that the sheet is placed on the tray, and a detection by the detection unit Based on the result, driving means for driving the pickup roller to move from a contact position that contacts the sheet to a separated position that separates from the sheet, and the detection after a lapse of a predetermined time after driving the driving means. And a determination unit that determines whether or not the sheet can be supplied based on a detection result of the unit.

  According to the present invention, it is possible to provide a technique for preventing a document set failure even if a pickup roller falls.

1 is a schematic explanatory diagram showing the overall configuration of an automatic document feeder. The block diagram which shows a control structure. FIG. 3 is a partial cross-sectional view of a main part of the automatic document feeder. FIG. 4 is an exploded perspective view of the automatic document feeder with a cover opened. The operation mechanism of the stopper portion of the automatic document feeder is shown. (A) is the stopper member fixed, (B) is the stopper member is unfixed, (C) is the pickup roller feeding position, (D) is the sheet Explanatory drawing which shows the state conveyed. FIG. 3 is an exploded perspective view in which an inner member of a cover of the automatic document feeder is omitted. 4A is a cross-sectional view of a document set sensor according to the first embodiment before (A) and after document detection. 9 is a flowchart showing conventional document reading control. 6 is a flowchart showing document reading control in the first embodiment. (A) in operation | movement of the movement detection part in 2nd embodiment is a perspective view which shows before the fall of a pick-up roller, (B) is falling, (C) is after dropping.

  Embodiments of the present invention will be described below with reference to the drawings. Throughout the drawings, the same reference numerals indicate the same or corresponding parts. Further, in the following description, the vertical and horizontal directions in the drawings are used for description as the apparatus or the vertical and horizontal directions of each component described below.

  The present invention will be described with reference to an example of a document feeding device in a document reading device provided in an image forming apparatus such as a copying machine or a facsimile. However, the present invention is not limited to the document feeding device, and includes, for example, various printing machines such as a printer, a copying machine, a FAX, a multifunction machine, and the like. The present invention can be applied to various devices such as a reading device.

  FIG. 1 shows an automatic document feeder (feeder, ADF) to which the present invention is applied as a first embodiment. In FIG. 1, A is an automatic document feeder mounted on the image reading apparatus body R1, and the automatic document feeder A passes through the upper surface of the contact glass 2 (left side in FIG. 1) of the reading apparatus body R1. Transport the document. The reading device main body R1 irradiates a conveyed document with light from a light source such as a lamp via a contact glass 2, and reads a document image obtained by photoelectrically converting the reflected light by a reading unit such as a CCD. That is, the upper surface of the contact glass 2 and the lower side thereof constitute the reading device R of the reading device main body R1. The reading device main body R1 also includes a contact glass 3 (center in FIG. 1) having an area where a document can be placed. By opening and closing the automatic document feeder A and placing a document on the upper surface of the contact glass 3, the reading unit comprising a light source and a CCD is moved in the sub-scanning direction (left and right direction in FIG. 1), and the contact glass 3 is moved. It is also possible to read the image of the original.

  The automatic document feeder A includes a sheet feed tray 15 on which a plurality of documents can be placed along a document conveyance path, and a feeding unit A1 that feeds documents on the sheet feed tray 15 (on the tray). And a transport unit A2 and a paper discharge tray 13 for storing documents. The feeding unit A1 separates the originals on the paper feed tray 15 one by one and feeds them toward the contact glass 2. The conveyance unit A <b> 2 includes a pair of conveyance rollers 22 on the upstream side of the contact glass 2 and a pair of conveyance rollers 23 on the downstream side, and allows the document to pass along the upper surface of the contact glass 2. The paper discharge tray 13 stores documents that have passed through the upper surface of the contact glass 2.

  FIG. 2 shows a control block diagram of this embodiment. FIG. 1 shows the arrangement of the sensors S1 to S5 shown in FIG. The CPU 100 may be configured to control only the driving of the automatic document feeder A, or may be configured to control the entire image reading apparatus main body R1. The CPU 100 is connected to the sensors S1 to S5, and drives a paper feed motor M1 and a transport motor M2 (not shown) based on detection signals from the sensors. Referring to FIG. 1, an automatic document feeder A is fed through a document set sensor (sensor unit) S1 for detecting that a document is placed on a sheet feed tray 15 on a conveyance path, and a sheet feed path 25. A registration sensor S2 for detecting the edge of the original. The automatic document feeder A further includes a lead sensor S3 that is provided in front of the contact glass 2 and detects an end portion of the document, and a discharge sensor S4 that detects an end portion of the document discharged from the contact glass 2. The sensor S5 is a sensor that detects the position of a pickup roller 18 described later, and may be omitted in this embodiment.

  The paper feed motor M1 connected to the CPU 100 is controlled by a motor driver MA. The paper feed motor M1 drives the pickup roller 18. The transport motor M2 connected to the CPU 100 is controlled by the motor driver MB. And the conveyance motor M2 drives the conveyance rollers 22 and 23 mentioned later.

<Paper feeding operation>
With reference to a partial cross-sectional view of the main part of the automatic document feeder A shown in FIG. 3, the sheet feeding operation performed by the automatic document feeder A will be described. When the automatic document feeder A performs a sheet feeding operation, first, when the document set sensor S1 is turned on, that is, when it is detected that a document is placed on the sheet feeding tray 15, the sheet feeding motor M1 is activated. Driven and a document is fed. At this time, the pickup roller 18, which can be moved up and down by a drive unit (not shown), is moved downward as indicated by an arrow A in the drawing and is brought into contact with the uppermost surface of a document (not shown) on the paper feed tray 15. Next, the pick-up roller 18 is rotated in the clockwise direction so that the original is fed into the automatic document feeder A.

  When a plurality of originals are fed out, they are separated by the paper feed roller 19 and the separation pad 20. The paper feed roller 19 passes only one uppermost original, and the second and subsequent originals are blocked by the separation pad 20. At this time, the pickup roller 18 and the paper feed roller 19 are rotated in the document feeding direction, but the registration roller pair 21 is not rotated by the action of a one-way clutch (not shown). The leading edge of the original separated into one sheet is abutted against the registration roller pair 21.

  When the registration sensor S2 detects the leading edge of the fed document, the paper feeding motor M1 is temporarily stopped after a predetermined time from the detection. When the paper feed motor M1 is stopped, the leading edge of the document is applied to the nip portion of the registration roller pair 21 to form a deflection, the leading edge of the document is aligned, and the skew is removed. After this stop, the paper feed motor M1 is driven in reverse and the transport motor M2 is driven. At this time, the pickup roller 18 rises to a position away from the document, the drive of the paper feed roller 19 is cut off by the action of the one-way clutch, and the registration drive roller 21a of the registration roller pair 21 is rotated in the document feeding direction.

  The document aligned with the registration roller pair 21 is fed further downstream to the conveyance roller pair 22. By the rotational drive of the two motors, the document is transported from the paper feed path 25 to the transport path 26, and after the lead sensor S3 detects the passage of the leading edge of the document, the paper feed motor M1 is stopped after a predetermined time. . Next, the transport motor M2 is temporarily stopped. When the reading conveyance signal is received from the image reading apparatus main body A, the conveyance motor M2 is driven again. The document is conveyed to the upper surface of the contact glass 2, and the surface (one side) is read by the reading device. At this time, the document is conveyed onto the paper discharge tray 13 by pushing up the front end of a flapper 29 arranged so as to block the paper discharge path 27 at the front end.

<Stopper member 60>
FIG. 4 is an exploded perspective view of the automatic document feeder A with the exterior cover 10a opened. One stopper member 60 is provided between the pickup roller 18 and the paper feed roller 19 in the document transport direction and on each of both sides of the paper feed roller 19 or the pickup roller 18 in the direction intersecting the transport direction. It is done. These stopper members 60 are rotatably attached to the exterior cover 10a, and can be moved in conjunction with the lifting and lowering operation of the pickup roller 18. Specifically, the stopper member 60 includes a restriction position for restricting the leading edge of the document placed on the paper feed tray 15, and a restriction release position for releasing the restriction by rotating a predetermined amount downstream in the paper feed direction. It is configured to be movable. Further, the stopper member 60 is pushed up by the leading edge of the document fed by the pickup roller 18 at the restriction release position, and further rotated toward the downstream side in the transport direction so as to be retracted from the paper feed port of the paper feed path 25. Composed.

<Rotation of stopper member>
The rotation operation of the stopper member 60 will be described with reference to FIG. FIG. 5A is a diagram showing a state in which the document (sheet) C is placed on the paper feed tray 15. At this time, the pickup roller 18 is raised to a standby position separated from the document C. The pickup roller 18 is rotatably supported by the support member 18a via the shaft 18b. Further, a conveyance roller 19 is rotatably connected to an end portion of the support member 18a opposite to the end portion to which the pickup roller 18 is connected. The stopper member 60 is pivotally connected to the exterior cover 10a via a pivot shaft 60a.

  In the state shown in FIG. 5A (the standby position of the pickup roller 18), the stopper member 60 is in a position (first position) that closes the paper feed port 25a of the paper feed path 25. That is, the stopper member 60 is restricted from rotating in the paper feeding direction (left direction in the figure) by the regulating member 61 rotatably attached to the shaft 18b of the pickup roller 18. The end of the restricting member 61 is engaged with the end of the stopper member 60, thereby preventing the stopper member 60 from rotating about the rotation shaft 60a. Even if the original C enters the paper supply port 25a of the paper supply path 25 in this state, the leading edge of the original C abuts against one end of the stopper member 60 to prevent further entry, and the original C remains in the paper supply tray. 15 at an appropriate position.

  Thereafter, as shown in FIG. 5B, the support member 18a rotates around the end to which the conveying roller 19 is connected so that the pickup roller 18 is lowered by the document feed command from the image reading device R1. Move. At this time, the support member 18a moves relative to the exterior cover 10a. Then, the regulating member 61 lowered together with the support member 18a contacts the release member 63 provided integrally with the exterior cover 10a, and rotates clockwise around the shaft 18b so as to be pushed up by the release member 63. That is, the end of the restricting member 61 is pushed upward so as to release the engagement with the stopper member 60. As a result, the stopper member 60 can be rotated clockwise about the rotation shaft 60a. In the state shown in FIG. 5B, the document C has not moved from the position on the paper feed tray 15 shown in FIG.

  Next, as shown in FIG. 5C, when the pickup roller 18 is lowered by a predetermined amount, the other end portion 60b of the stopper member 60 comes into contact with the rotating member 62 provided on the support member 18a, and the stopper member 60 is rotated a predetermined amount. Move. At this time, the pickup roller 18 is in contact with the original C and is located at a feeding position for feeding it out. In this way, the stopper member 60 is slightly rotated clockwise and tilted in the paper feeding direction. At this time, the stopper member 60 is suspended by its own weight. However, the rotation of the stopper member 60 to the upstream side in the sheet feeding direction is restricted at a tilted position (third position) by the rotation member 62. In this state, the tilted position is maintained.

  As shown in FIG. 5D, when the pickup roller 18 contacts the uppermost document C on the paper feed tray 15, the document C is fed out toward the transport roller 19 by the rotation of the pickup roller 18. By the leading edge of the document C being fed out, the stopper member 60 is rotated clockwise to a position (second position) through which the document C passes, and is pushed up to separate the document C from the transport roller 19 beyond the position of the stopper member 60. It is sent between the pads 20.

<Original set sensor>
FIG. 6 is an exploded perspective view in which the inner member of the exterior cover 10a of the automatic document feeder A is omitted. The document placed on the sheet feed tray 15 is regulated by a side guide (not shown) that regulates the side portion thereof, and the leading end is regulated by a stopper member 60 described later (see FIG. 5A). As shown in FIGS. 4 and 6, the document set sensor flag 30 is disposed immediately before the restriction of the stopper member 60.

  The operation of the document set sensor flag 30 will be described with reference to FIGS. 6 and 7A and 7B. As shown in FIG. 6, the document set sensor flag 30 includes a lever portion 30a that rotates in contact with the end portion of the document, and a flag portion 30b that is connected to the lever portion 30a and rotates as the lever portion 30a rotates. Prepare. The document set sensor flag 30a is disposed on the exterior cover 10a. In the automatic document feeder A that is not the exterior cover 10a, the sensor section S1 is disposed at a position adjacent to the flag section 30b when the exterior cover 10a is closed. The sensor unit S1 may be, for example, an optical sensor, and may be configured to detect the rotation of the lever unit 30a when light is blocked by the flag unit 30b.

  7A and 7B are views of the document set sensor flag 30 in FIG. 6 as viewed along the axis of the pickup roller 18 from the left side in the drawing. In the drawing, a portion surrounded by a circle omits illustration of a member on the near side of the flag portion 30b, for example, the lever portion 30a for the sake of explanation. In the state shown in FIG. 7A, the leading edge of the document C comes into contact with the lever portion 30a, but the document C does not push out the lever portion 30a, and the sensor unit S1 moves the lever portion 30a (flag portion 30b). It has not been detected yet. FIG. 7B shows a state in which the document C pushes out the lever portion 30 a and the leading end of the document C is in contact with the stopper member 60. At this time, the flag unit 30b blocks the light of the sensor unit S1 by the rotation of the lever unit 30a. Therefore, the sensor unit S1 detects the movement of the lever unit 30a (flag unit 30b) and detects that the document C is placed on the paper feed tray 15 (sheet detection). 7A and 7B, the pickup roller 18 is located at the standby position.

  As described above, the document set sensor flag 30 and the sensor unit S1 constitute a detection unit that detects that the document C is placed on the paper feed tray 15. Therefore, when the leading edge of the document hits the document set sensor flag 30, the sensor unit (document set sensor) S1 can detect that the document can be fed (supplied) by the rotation of the document set sensor flag 30.

  By the way, as described above, in order for the stopper member 60 to restrict the movement of the leading edge of the document, the pickup roller 18 must be stopped at the raised position (standby position) as shown in FIG. At this time, for example, the user may strike the automatic document feeder A by aligning a bundle of documents C on the exterior cover 10a of the automatic document feeder A. When an impact is applied to the automatic document feeder A, the lever unit 30a and the flag unit 30b of the document set sensor flag 30 may be rotated by vibration. As a result, it may be erroneously detected that the document is set even though the document C is not placed on the paper feed tray 15.

  Further, when an impact is applied to the automatic document feeder A, the pickup roller 18 may fall. In that case, as shown in FIG. 5C, the restriction of the stopper member 60 may be released by the pickup roller 18 that has dropped. If the user places the document C without knowing that the pickup roller 18 has fallen and is in the feeding position, the document C cannot stay in the predetermined position by the stopper member 60. As a result, the original may be mis-set, which causes a malfunction such as a double feed or a paper feed delay error.

  Therefore, FIG. 8 shows a control flow for executing the above-described countermeasure against chattering of the conventional sensor. In the description of the conventional chattering countermeasure with respect to FIG. 8 below, only the control executed as a chattering countermeasure will be described (S801 to S810). About other description, it is the same as that of 1st embodiment of this invention demonstrated below.

  In the control flow shown in FIG. 8, it is assumed that the automatic document feeder A is in a standby state, for example, when it is energized. In step S <b> 801, the CPU 100 confirms whether the document set sensor flag 30 has detected that the document C is placed on the sheet feed tray 15. As the detection, regardless of whether or not the document C is actually placed as described above, the sensor unit S1 is rotated by the document set sensor flag 30 due to the impact on the automatic document feeder A. It also includes the case of false detection. In any case, when the sensor unit S1 outputs a detection signal (detection information) due to some movement of the document set sensor flag 30 (YES in S801), the CPU 100 determines whether the automatic document feeder (ADF) A is operating in S802. Determine whether.

  If it is not in operation (NO in S802), the CPU 100 drives the timer in S803 to determine whether or not a predetermined time has elapsed. When a predetermined time (for example, 200 msec) has elapsed (YES in S803), in S804, the CPU 100 detects again whether or not the document C has been placed on the sheet feed tray 15 by the document set sensor flag 30. If the document set sensor flag 30 detects that the document C is placed on the paper feed tray 15 (YES in S804), the CPU 100 determines that the document C is set on the paper feed tray 15. In step S805, the pickup roller 18 is lifted.

  After the lifting operation of the pickup roller 18 is completed, the CPU 100 turns on the document setting LED in S806, determines that the document has been set, and transitions to a paper feeding operation standby state in S807. Next, when the start button is pressed in the document feed operation standby state in S808 (YES in S808), the document is read in S809. Note that as shown in S810, when the sensor unit S1 is detected to be OFF, that is, when it is detected that the document has run out, the CPU 100 ends the document reading.

  On the other hand, if the document set sensor flag 30 does not detect the placement of the document C in S804 (NO in S804), the CPU 100 does not determine that the document C has been set on the paper feed tray 15, and returns to S801. Wait until the original is set again. Here, if the pickup roller 18 is lowered due to an impact or the like, there is no opportunity for the pickup roller 18 to be lifted.

  In other words, in the conventional control flow, even if the sensor unit (document set sensor) S1 is detected as ON as a countermeasure against erroneous detection such as an impact, a document is set if it is not in an ON state after a predetermined time (about 200 msec). Not confirmed. In the conventional misdetection avoidance, since it is not determined that a sensor has been set for a short time (200 msac) or less due to an impact or the like, the pick-up operation and the document setting LED lamp are not turned on. Therefore, the pick-up operation could not be performed as a countermeasure against the drop of the pickup roller 18.

<First embodiment>
Therefore, in the first embodiment of the present invention, in order to prevent such inconvenience, by adopting the control flow shown in FIG. Make both. That is, even if the pickup roller 18 is dropped due to an impact, it is possible to avoid a document setting defect. The document transport control operation of the automatic document feeder A having the above configuration will be specifically described.

  In the control flow shown in FIG. 9, it is assumed that the automatic document feeder A is in a standby state, for example, when it is energized. In step S <b> 901, the CPU 100 confirms whether the document set sensor flag 30 has detected that the document C is placed on the sheet feed tray 15. As the detection, regardless of whether or not the document C is actually placed as described above, the sensor unit S1 is rotated by the document set sensor flag 30 due to the impact on the automatic document feeder A. It also includes the case of false detection. In any case, if the sensor unit S1 outputs a detection signal (detection information) due to some movement of the document set sensor flag 30 (YES in S901), the CPU 100 determines whether or not the automatic document feeder (ADF) A is operating in S902. Determine whether.

  If the sensor unit S1 does not output a detection signal (detection information) (NO in S901), S901 is repeated until a detection signal is output. Next, when the ADF is in operation (YES in S902), S901 and 902 are repeated until the document feeding is finished, that is, until the sensor unit S1 does not output a detection signal.

  If the ADF is not operating (NO in S902), the CPU 100 lifts the pickup roller 18 in S903. That is, a drive unit (not shown) that drives the pickup roller 18 to move to the feeding position and the standby position drives the pickup roller 18 to move to the standby position. At this time, it is unclear whether the pickup roller 18 is in the feeding position or the standby position. Therefore, for the time being, the drive unit lifts the pickup roller 18. In addition, since a clutch mechanism is appropriately provided on the power transmission path between the drive unit and the pickup roller 18, even if the pickup roller 18 is in the standby position, no extra load is applied to the drive unit. It is configured.

  Then, after the lifting operation of the pickup roller 18 is completed (after driving of the driving unit), in S904, the CPU 100 drives the timer to determine whether or not a predetermined time has elapsed. In the present embodiment, the predetermined time is at least 200 msec, but may be appropriately changed depending on the sensor sensitivity and the device configuration. In consideration of the time for the chattering of the document set sensor to converge, 200 msec or more can be set.

  If 200 msec has elapsed (YES in S904), in S905, the CPU 100 detects again whether or not the original C has been placed on the paper feed tray 15 by the original set sensor flag 30. If 200 msec has not elapsed (NO in S904), the CPU 100 repeats S904 until 200 msec has elapsed.

  Next, when the document set sensor flag 30 detects that the document C is placed on the paper feed tray 15 (YES in S905), the CPU 100 determines that the document C is set on the paper feed tray 15. In step S906, the CPU 100 turns on the document set LED. In step S907, the CPU 100 determines that a document has been set, and shifts to a paper feeding operation standby state. In step S908, the CPU 100 waits until the start button is pressed by the user in the standby state. When the start button is pressed (YES in S908), document reading is executed in S909. If the start button is not pressed (NO in S908), the CPU 100 repeats S907 and S908 until the start button is pressed.

  In step S <b> 910, the CPU 100 confirms whether or not the original C placed on the paper feed tray 15 has been exhausted. That is, it is determined whether or not the signal from the sensor unit S1 has been turned off by moving the original set sensor flag 30 to the original position (position to close the paper feed port 25a) due to the absence of the original. If the signal from the sensor unit S1 is not turned OFF (NO in S910), the CPU 100 repeats S909 and S910 until there is no document.

  When the signal from the sensor unit S1 is turned off (YES in S910), the CPU 100 determines whether the next document is subsequently placed on the paper feed tray 15. That is, in S911, the CPU 100 drives the timer and determines whether or not a predetermined time has elapsed. In the present embodiment, the predetermined time is at least 200 msec, but may be appropriately changed depending on the sensor sensitivity and the device configuration. When 200 msec has elapsed (YES in S911), in S912, the CPU 100 confirms whether or not the original C placed on the paper feed tray 15 has been lost as in S910. If 200 msec has not elapsed (NO in S911), the CPU 100 repeats S911 until 200 msec has elapsed.

  If the signal from the sensor unit S1 is not turned OFF (NO in S912), the CPU 100 executes the original reading from the original S909 again. When the signal from the sensor unit S1 is turned off (YES in S912), the CPU 100 ends the process on the assumption that the reading of the document has ended.

  Conventionally, the ON state of a short-time sensor signal generated by an impact such as an operation of aligning documents on the automatic document feeder A is conventionally checked by the CPU again after a predetermined time has elapsed in order to prevent malfunction. It was determined whether or not it was possible to feed. However, according to the present embodiment, even if the sensor signal is turned on for a short time, the pickup roller is returned to the standby position, so that the stopper member can be locked without adding a sensor. Therefore, it is possible to restrict the leading edge of the document from entering accidentally.

  Further, if the document setting is instantaneously determined based on the ON state of the document setting sensor, the document setting lamp is erroneously turned on, and even if there is no document, there is a possibility of erroneous feeding. However, since a delay can be added to the determination for a predetermined time (200 msec) or more after the signal in the ON state, erroneous lighting or sheet feeding malfunction can be prevented.

<Second embodiment>
The document set sensor flag 30 according to the second embodiment will be described with reference to FIG. FIG. 10A is a perspective view showing the state before the pickup roller is dropped, FIG. 10B is being dropped, and FIG. In the present embodiment, there is provided a movement detection unit 32 that detects that the pickup roller 18 has moved down from the raised standby position to the feeding position or the like.

  The movement detection unit 32 is connected to the document set sensor flag (detection unit) 30, and when the pickup roller 18 moves from the standby position to the feeding position, the document set sensor flag 30 is rotated, and the sensor unit S1 detects the detection information. Is output. More specifically, the movement detection unit 32 is a plate-like member and is disposed adjacent to the support member 18 a of the pickup roller 18. Since the movement detection unit 32 is disposed on the exterior cover 10a together with the document set sensor flag 30, it can be moved relative to the support member 18a. Here, the movement protrusion 31 is disposed at a location adjacent to the movement detection unit 32 of the support member 18a. The movement protrusion 31 is a protrusion member extending from the side surface of the support member 18a toward the movement detection unit 32.

  FIG. 10A shows a state in which the pickup roller 18 is positioned at the standby position, the document set sensor flag 30 is stationary, and the sensor unit S1 does not output detection information (ON signal). For example, when the pickup roller 18 moves from the standby position to the feeding position from this state, the movement protrusion 31 of the support member 18a moves across the movement detection unit 32 as shown in FIG. At this time, the movement protrusion 31 moves so as to push the movement detection unit 32 to the right side in the drawing. Then, the movement detector 32 connected to the document set sensor flag 30 acts to rotate the document set sensor flag 30. At this time, as shown in FIG. 10B, the flag portion 31b of the document set sensor flag 30 acts on the sensor portion S1 to output detection information.

  FIG. 10C shows a state in which the pickup roller 18 is in the feeding position. In this state, the movement protrusion 31 has crossed the movement detection unit 32, and the document set sensor flag 30 returns to the original state (the state in which the sensor unit S1 does not output detection information (ON signal)). Yes.

  As described above, according to the present embodiment, since the sensor unit S1 can detect the movement of the pickup roller 18, the pickup roller 18 can be moved to the standby position. In other words, even if the user gives an impact to align the documents to the exterior cover, it can be detected and lifted when the pickup roller 18 is in a fall state, and the stopper member 60 can be regulated. Therefore, the leading edge of the document inserted by the user can be regulated by the stopper member 60, and a document setting failure can be prevented.

  In the first embodiment, it can be assumed that the document set sensor flag 30 itself is not rotated due to the strength of impact and the pickup roller 18 moves. However, in the present embodiment, when the pickup roller 18 moves, the document set sensor flag 30 can be forcibly rotated, and the sensor unit S1 can detect the movement. Note that the control flow at that time is the same as the control flow shown in FIG. 9, and the step in which the sensor unit S1 detects the movement of the pickup roller 18 is S901.

<Other embodiments>
Moreover, instead of the combination of the movement detection unit 32 and the movement protrusion 31, for example, a second flag unit 33 attached to the support member 18a shown in FIG. 6 and a pick sensor S5 provided on the exterior cover 10a as a movement detection unit You may employ | adopt the combination of. In this case, when the pickup roller 18 is in the standby position, the signal of the pick sensor S5 such as an optical sensor is blocked by the second flag section 33. However, when the pickup roller 18 moves to the feeding position, the second flag portion 33 moves away from the pick sensor S5, so that the signal of the pick sensor S5 is turned on. Therefore, the movement of the pickup roller 18 can be detected. Therefore, the pickup roller 18 can be detected and lifted, and the stopper member 60 can be regulated, so that the leading edge of the document inserted by the user can be regulated. A set failure can be prevented.

  In the present embodiment, the image reading apparatus main body R1 may employ an image forming unit that forms an image on a medium or a medium conveyance unit that conveys a medium. The “original” is assumed to be sheet-like paper, but may be cloth, plastic film, or the like.

A automatic document feeder, 10a exterior cover, A1 feeding section, 15 paper feed tray, 18 pickup roller, 18a support member, 19 paper feed roller, 20 separation pad, 25 paper feed path, 30 document set sensor flag, 60 Stopper member, 61 Restriction member, 62 Rotating member, 63 Release member, S1 Document set sensor, S2 Registration sensor, S3 Lead sensor, S4 Paper discharge sensor, S5 Pick sensor,

Claims (10)

A pickup roller that contacts the sheet on the tray and feeds the sheet;
Detecting means for detecting that the sheet is placed on the tray;
Driving means for driving the pickup roller to move from a contact position contacting the sheet to a separation position separating from the sheet based on a detection result of the detection means;
A determination unit that determines whether or not the sheet can be supplied based on a detection result of the detection unit after a lapse of a predetermined time after the driving of the drive unit;
A supply device comprising: The drive means is driven to move the pickup roller from the contact position to the separation position based on a first detection result detected by the detection means before the predetermined time elapses.
The supply device according to claim 1, wherein the determination unit determines whether the sheet can be supplied based on a second detection result detected by the detection unit after the predetermined time has elapsed. .   3. The feeding apparatus according to claim 1, wherein the pickup roller feeds the sheet on the tray when the determination unit determines that the sheet can be supplied.   The supply device according to claim 1, wherein the predetermined time is at least 200 msec. Further comprising stopper means for restricting movement of the sheet on the tray and releasing the restriction according to the position of the pickup roller;
The detection means is arranged upstream of the stopper means in the transport direction,
When the pickup roller is in the separated position, the stopper means restricts the movement of the sheet,
5. The feeding device according to claim 1, wherein when the pickup roller is in the contact position, the stopper unit releases the restriction on the movement of the sheet.   6. The detection unit according to claim 1, further comprising: a lever part that rotates in contact with an end part of the sheet; and a sensor part that detects the rotation of the lever part. The supply device described in 1. A movement detecting means for detecting movement of the pickup roller;
The supply device according to claim 1, wherein the driving unit drives the pickup roller to move to the separation position in accordance with detection information from the movement detection unit. . The movement detection means is connected to the detection means, and is detected by the detection means when the pickup roller moves from the separation position to the contact position.
The supply device according to claim 7, wherein the driving unit drives the pickup roller to move to the separation position based on detection information of the detection unit. A supply device according to any one of claims 1 to 8,
Control means for controlling the supply of the sheet of the supply device;
Reading means for reading the supplied sheet;
A reading device comprising:
The control unit causes the supply unit to supply the sheet when the determination unit of the supply unit determines that the sheet can be supplied.
The reading device, wherein the reading unit reads the supplied sheet. A pickup roller that contacts the sheet on the tray and feeds the sheet;
Detecting means for detecting that the sheet is placed on the tray;
Driving means for driving the pickup roller to move from a contact position contacting the sheet to a separation position separating from the sheet based on a detection result of the detection means;
A method of controlling a supply device comprising:
A detection step in which the detection means detects that the sheet is placed on the tray after a predetermined time has elapsed after the drive means is driven;
A determination step of determining whether or not the sheet can be supplied based on a detection result of the detection unit;
A control method comprising:

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