JP2018006856A - Image reading device and feeding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading device capable of improving throughput, and a feeding method.SOLUTION: An image reading device comprises: a feeding section 18 having a feeding roller 19 feeding a manuscript from a placement section capable of placing the manuscript toward a conveyance path 17 and a friction force imparting section 20 imparting friction force to an opposite side to a conveyance direction Y between itself and the manuscript fed by the feeding roller 19; a feeding detection section 38 capable of detecting the manuscript fed by the feeding section 18; and a reading section reading an image of the manuscript conveyed from an upstream side to a downstream side in the conveyance direction Y on the conveyance path 17. The feeding detection section 38 is provided at a position between a holding position P1 where the feeding roller 19 and the friction force imparting section 20 hold the manuscript and an intersection position P2 closer to the downstream side in the conveyance direction Y than the holding position P1 where a tangent line T of the feeding roller 19 orthogonally intersects with the conveyance path 17 in the conveyance direction Y, the position being different from the feeding roller 19 in a width direction X intersecting with the conveyance direction Y.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an image reading apparatus such as a scanner for reading an image of a document, and a feeding method in the image reading apparatus.

  2. Description of the Related Art Conventionally, an image reading apparatus including a pickup roller (feeding roller) that feeds a document placed on a document tray (mounting unit) to a conveyance path and a reading unit that reads an image of the fed document is provided. Known (for example, Patent Document 1).

  In such an image reading apparatus, a document detection sensor is provided in the vicinity of the reading unit, and reading is started by the reading unit triggered by the detection of the leading edge of the document by the document detection sensor.

JP2015-195442A

  By the way, since the document detection sensor is provided in the vicinity of the reading unit, for example, when the next document is fed using the detection of the trailing edge of the document by the document detection sensor as a trigger, the interval between the documents is set. It became wide and the throughput decreased.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an image reading apparatus and a feeding method capable of improving the throughput.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
An image reading apparatus that solves the above-described problem is provided between a feeding roller that feeds the document toward a conveyance path from a placement unit on which the document can be placed, and the document that is fed by the feeding roller. A feeding unit having a frictional force applying unit that applies a frictional force in the direction opposite to the conveyance direction, a feeding detection unit capable of detecting the original document fed by the feeding unit, and the conveyance A reading unit that reads an image of the document that is conveyed from the upstream side toward the downstream side in the conveyance direction, and the feeding detection unit includes the feeding roller and the frictional force applying unit. A position in the conveyance direction between a nipping position where the document is nipped and a crossing position where the tangent line of the feeding roller intersects perpendicularly with respect to the conveyance path on the downstream side of the nipping position in the conveyance direction. The feeding in the width direction intersecting the transport direction Provided at a position different from the Ra.

  According to this configuration, since the feed detection unit is provided so as to overlap the feed roller in the transport direction, compared to the case where the feed detection unit is provided downstream of the feed roller in the transport direction, The fed original can be detected quickly. Therefore, for example, by feeding a document based on the detection result of the feed detection unit, the interval between the completion of feeding the previous document and the feeding of the next document is shortened, and the throughput is improved. be able to.

  It is preferable that the image reading apparatus further includes a transport roller that transports the document along the transport direction, and the feeding detection unit is provided at a position upstream of the transport roller in the transport direction.

  According to this configuration, since the feed detection unit is provided at a position upstream of the transport roller in the transport direction, the feed detection unit is provided at a position downstream of the transport roller in the transport direction. In comparison, the distance between the originals in the transport direction can be reduced.

  The image reading apparatus may further include a double feed detection unit capable of detecting double feed of the document, and the feed detection unit is provided at a position upstream of the double feed detection unit in the transport direction. preferable.

  According to this configuration, since the feed detection unit is provided on the upstream side in the transport direction from the double feed detection unit, the feed detection unit is provided at a position downstream of the double feed detection unit in the transport direction. Compared to the case, the interval between the originals in the transport direction can be narrowed.

In the image reading apparatus, it is preferable that the multi-feed detection unit is provided on one side across the center of the conveyance path in the width direction, and the feed detection unit is provided on the other side.
According to this configuration, the feed detection unit is provided on the opposite side of the double feed detection unit across the center of the transport path. That is, since the feed detection unit is provided at a position away from the double feed detection unit in the width direction, it is possible to easily secure a space for providing the feed detection unit.

It is preferable that the image reading apparatus further includes a housing unit that houses the feeding roller, and the feeding detection unit is provided at a position different from the housing unit.
According to this configuration, for example, when the feeding unit is exposed to the outside, such as when the feeding roller is replaced, the possibility that the feeding detection unit is exposed to the outside can be reduced.

  In the image reading apparatus, a power transmission unit that transmits a driving force of a driving source to the feeding roller is provided on one side across the center of the conveyance path in the width direction, and the feeding detection is performed on the other side. It is preferable that a part is provided.

  According to this configuration, the feed detection unit is provided on the opposite side of the power transmission unit across the center of the transport path. That is, since the feed detection unit is provided at a position away from the power transmission unit in the width direction, it is possible to easily secure a space for providing the feed detection unit.

In the image reading apparatus, it is preferable that the feeding detection unit is provided at a position of 35 mm or more and 40 mm or less from the center of the conveyance path in the width direction.
In a so-called bible size document, a hole for passing through the ring may be formed along the long side. According to this configuration, since the feed detection unit is provided at a position where a hole formed in the bible-size document passes, the feed detection unit can detect the hole formed in the document.

  In addition, a feeding method for solving the above problems includes a feeding roller that feeds the document from a placement unit on which the document can be placed toward a conveyance path, and the document that is fed by the feeding roller. A feeding unit having a frictional force applying unit that applies a frictional force to the opposite side to the conveying direction between, and a feeding detecting unit capable of detecting the original document fed by the feeding unit, A reading unit that reads an image of the document that is transported from the upstream side toward the downstream side in the transport direction, and the feed detection unit includes the feed roller and the frictional force applying unit. Between the nipping position where the document is nipped and the crossing position where the tangent of the feeding roller intersects perpendicularly with respect to the conveyance path on the downstream side of the nipping position in the conveying direction. Position in the width direction intersecting the transport direction. A feeding method in an image reading apparatus provided at a position different from a roller, wherein the feeding unit feeds the document to the feeding unit, and the feeding detection unit detects a trailing edge of the document. And a second feeding step of feeding the next document when the trailing edge of the document is detected by the feeding detection unit.

  According to this configuration, the same effects as those of the image reading apparatus can be obtained.

1 is a schematic diagram of an embodiment of an image reading apparatus. The schematic plan view of a main-body part. Schematic diagram of a bible sized manuscript. FIG. 3 is a schematic diagram of a document and a feed detection unit. FIG. 3 is a schematic diagram of a document and a feed detection unit. The schematic diagram of a feeding part and a feeding detection part. The block diagram of a control part. 6 is a flowchart of an image reading processing routine. 10 is a flowchart of a holeless feed processing routine. The flowchart of a feeding process routine with a hole.

  Hereinafter, an embodiment of an image reading apparatus will be described with reference to the drawings. Note that the image reading apparatus according to the present embodiment is a sheet feed scanner in which, for example, an image of a conveyed document is read by a fixed reading unit.

  As shown in FIG. 1, the image reading apparatus 11 includes a main body portion 12 having a substantially trapezoidal box shape in a side view, and a rotation portion 14 that can rotate around a shaft 13 provided in the main body portion 12. Yes. That is, the rotation unit 14 rotates between a closed position indicated by a solid line in FIG. 1 and an open position indicated by a two-dot chain line in FIG.

  Further, the image reading apparatus 11 feeds the document D from the placement unit 16 on which a plurality of documents D can be stacked and the conveyance unit 17 indicated by a one-dot chain line in FIG. And a feeding unit 18 that performs the above-described operation. The feeding unit 18 has a conveyance direction Y between the feeding roller 19 that feeds the document D from the placement unit 16 toward the conveyance path 17 and the document D that is fed by the feeding roller 19. And a frictional force applying unit 20 that applies a frictional force to the opposite side. Note that the frictional force applying unit 20 of the present embodiment is a separation roller that rotates while being in contact with the document D and separates the documents D from each other. The feeding unit 18 is provided so as to be replaceable by positioning the rotating unit 14 at the open position. That is, the feeding roller 19 is detachably provided on the main body 12, and the frictional force imparting portion 20 is detachably provided on the rotating portion 14.

  Further, at a position downstream of the feeding unit 18 in the transport direction Y, a transport roller 22 that transports the document D along the transport direction Y, and a transport driven roller 23 that is driven to rotate as the transport roller 22 rotates. Are provided so as to sandwich the conveyance path 17 therebetween. Then, at a position downstream of the conveyance roller 22 in the conveyance direction Y, at least one (a pair in this embodiment) reading unit 24 that reads an image of the document D is disposed on both sides of the conveyance path 17 in the main scanning direction (width). It is provided so as to extend in the direction X).

  That is, the transport roller 22 transports the document D fed by the feeding unit 18 from the upstream side in the transport direction Y toward the downstream side. The reading unit 24 provided in the main body 12 reads an image on the first surface (for example, the front surface) of the document D that is transported along the transport path 17 from the upstream side in the transport direction Y toward the downstream side. The reading unit 24 provided in the rotating unit 14 reads an image on the second surface (for example, the back surface) of the document D that is transported from the upstream side in the transport direction Y toward the downstream side in the transport path 17.

  Further, downstream of the reading unit 24 in the transport direction Y, a discharge roller 25 that discharges the document D from the main body unit 12, a discharge driven roller 26 that rotates following the rotation of the discharge roller 25, and the document D are provided. A discharge unit 27 is provided.

  Further, the image reading apparatus 11 includes a feeding motor 28 that is an example of a driving source for rotating the feeding roller 19 and a conveyance motor 29 that is a driving source for rotating the conveying roller 22. The transport motor 29 is also connected to the frictional force applying unit 20 and the discharge roller 25, and also rotates the frictional force applying unit 20 and the discharge roller 25.

  The feed roller 19, the transport roller 22, and the discharge roller 25 rotate forward so that the document D is transported from the upstream side in the transport direction Y to the downstream side as the feed motor 28 and the transport motor 29 are driven. . The frictional force applying unit 20 rotates in reverse so as to apply a frictional force to the document D in a direction opposite to the conveyance direction Y as the conveyance motor 29 is driven. Further, the transport roller 22 and the discharge roller 25 rotate faster than the feed roller 19, and the transport speed of the document D by the transport roller 22 is faster than the feed speed of the document D by the feed roller 19.

  Further, the image reading apparatus 11 includes a document detection unit 31 capable of detecting the document D placed on the placement unit 16 and a conveyance detection unit 32 capable of detecting the document D being conveyed. The conveyance detection unit 32 is provided at substantially the same position as the conveyance roller 22 in the conveyance direction Y. The document detection unit 31 and the conveyance detection unit 32 of the present embodiment are contact sensors having a lever, for example, and detect the presence or absence of the document D when the lever is pressed by the document D.

  As shown in FIG. 2, the placing portion 16 is provided with a pair of guide portions 34 that guide both ends in the width direction X of the placed document D. In FIG. 2, the center position in the width direction X of the placement unit 16 and the transport path 17 is indicated by a one-dot chain line as a center line L1 along the transport direction Y. The pair of guide portions 34 are provided so as to be slidable in the width direction X so as to approach each other so that the distances from the center line L1 are equal in the width direction X. Further, the document detection unit 31 is provided in the center of the placement unit 16 in the width direction X, and the conveyance detection unit 32 is provided in the center of the conveyance path 17 in the width direction X.

  Further, in the transport direction Y, a storage unit 35 that stores the feeding roller 19 is provided at a position between the document detection unit 31 and the transport detection unit 32. The feeding roller 19 is accommodated in the accommodating portion 35 in a state where the feeding roller 19 is connected to the power transmission portion 36 that transmits the driving force of the feeding motor 28 to the feeding roller 19. In addition, the accommodating part 35 of this embodiment is a recessed part, and is covered with the cover 37 in the state in which the feeding roller 19 was accommodated. That is, the cover 37 covers the housing portion 35 with the feeding roller 19 exposed, and a part of the transport path 17 is formed by the surface of the cover 37.

  Further, the image reading apparatus 11 includes a feeding detection unit 38 that can detect the document D fed by the feeding unit 18 and a double feed detection unit 39 that can detect double feeding of the document D. The feeding detection unit 38 is located at a position different from the housing unit 35, and is provided at a position different from the feeding roller 19 in the width direction X that intersects the transport direction Y. Further, in the width direction X, a double feed detection unit 39 is provided on one side across the center line L1, and a feed detection unit 38 is provided on the other side. Furthermore, the feed detection unit 38 is provided at a position upstream of the double feed detection unit 39 in the transport direction Y, and is provided at a position upstream of the transport roller 22 in the transport direction Y.

  The double feed detection unit 39 is provided on the power transmission unit 36 side of the center line L1 in the width direction X. In other words, in the width direction X, the power transmission unit 36 is provided on one side across the center line L1, and the feed detection unit 38 is provided on the other side.

  The feed detection unit 38 is provided at a position where the distance A from the center line L1 in the width direction X is 35 mm or more and 40 mm or less. The interval A is the interval between the center line L1 and the center of the detection area B of the feed detection unit 38, and is preferably 35 mm or more and 40 mm or less, and 37 mm or more and the so-called bible size document D. More preferably, it is 40 mm or less.

Next, the bible size document D will be described.
As shown in FIG. 3, the bible-size document D is a replacement or supplement document D called a refill corresponding to a B6 size system notebook. The size of the document D is often a rectangle having a width W of 95 mm and a height H of 170 mm to 175 mm. Further, the document D may have a plurality of (for example, six) holes 41 formed along the long side. The diameter Φ of the hole 41 is 5 mm to 7 mm, and the dimension W1 from the end (long side) of the document D to the hole 41 is often 6 mm to 7 mm.

  In FIG. 3, the center line L2 of the document D is indicated by a one-dot chain line. The center line L2 is a line parallel to the long side and passes through the center of the short side. Then, the document D is placed on the placement unit 16 and fed and conveyed so that the center line L2 of the document D and the center line L1 of the image reading device 11 are aligned.

  The diameter Φ and the dimension W1 of the hole 41 are determined for each document D. However, in FIGS. 4 and 5, the document D in which the holes 41 of different formats are formed is illustrated in order to simplify the description. It is shown.

  Now, as shown in FIG. 4, the feed detection unit 38 provides at least a part of the hole 41 of the conveyed document D by providing the gap A with the center line L1 at a position not less than 35 mm and not more than 40 mm. The hole 41 can be detected by the feed detection unit 38 by overlapping with the feed detection unit 38.

  That is, when the diameter Φ is 7 mm, the hole 41 is located in the range of 33.5 mm or more and 41.5 mm or less from the center line L2. Therefore, the distance A is 35 mm or more and 40 mm or less, which is an inner range by a radius (1.5 mm in the present embodiment) of the detection region B from the range in which the hole 41 having the maximum diameter can be formed. The hole 41 having a diameter of 7 mm and the feed detection unit 38 can be overlapped. In addition, when the diameter Φ of the hole 41 is 5 mm, at least a part of the hole 41 and the feeding detection unit 38 can be overlapped.

  As shown in FIG. 5, the hole 41 having a diameter Φ of 5 mm is located in the range of 35.5 mm to 41.5 mm from the center line L2. For this reason, the interval A is set to be 37 mm or more and 40 mm or less, which is an inner range corresponding to the radius of the detection region B, from the range in which the hole 41 having the smallest diameter can be formed. Accuracy can be improved.

  As illustrated in FIG. 6, the feeding detection unit 38 is an optical sensor, and includes a light emitting unit 43 that emits light and a light receiving unit 44 that receives light emitted from the light emitting unit 43. And the light emission part 43 and the light-receiving part 44 are arrange | positioned in the position which opposes on both sides of the conveyance path 17. FIG. Note that a region between the light emitting unit 43 and the light receiving unit 44 and overlapping with the conveyance path 17 is a detection region B. That is, the light emitting unit 43 emits light toward the detection region B, and the light receiving unit 44 receives light that has passed through the detection region B. Therefore, when the document D is positioned in the detection area B, the light is blocked by the document D and the amount of light received by the light receiving unit 44 is reduced, and the feeding detection unit 38 detects the document D.

  The feeding detection unit 38 is provided such that the detection region B is located at a position between the clamping position P1 and the intersection position P2 in the transport direction Y. The clamping position P1 is a position where the feeding roller 19 and the frictional force applying unit 20 clamp the document D. Further, the intersection position P2 is a position where the tangent line T of the feeding roller 19 intersects the conveyance path 17 orthogonally on the downstream side in the conveyance direction Y from the clamping position P1.

  The tangent line T is also a common tangent line that is in contact with the side surface of the cylindrical feeding roller 19 and the side surface of the cylindrical frictional force applying unit 20. That is, the feed detection unit 38 is configured such that the detection region B is positioned upstream in the transport direction Y from the intersection position P2 that is also the intersection of the common tangent of the feed roller 19 and the frictional force applying unit 20 and the transport path 17. Is provided.

  Further, the feeding roller 19 and the frictional force applying unit 20 may be formed of rubber or sponge, for example, and elastically deformed. That is, the feeding roller 19 and the frictional force applying unit 20 may come into contact with each other on the surface. In this case, the downstream end in the transport direction Y of the surface where the feeding roller 19 and the frictional force applying unit 20 are in contact with each other is set as the clamping position P1, and the feeding detection unit 38 is between the clamping position P1 and the intersection position P2. Provided. Accordingly, the feeding detection unit 38 detects the document D that has passed through the feeding unit 18.

  The double feed detection unit 39 is an ultrasonic sensor, and a transmission unit 45 capable of transmitting ultrasonic waves and a reception unit 46 capable of receiving ultrasonic waves transmitted by the transmission unit 45 sandwich the conveyance path 17. It is arrange | positioned in the position which opposes. The double feed detection unit 39 detects the double feed of the document D using the principle that the ultrasonic wave is attenuated in the gaps between the plurality of documents D fed in a superimposed manner.

Next, the electrical configuration of the image reading apparatus 11 will be described.
As shown in FIG. 7, the image reading apparatus 11 includes a control unit 48 that comprehensively controls driving of each mechanism in the image reading apparatus 11. That is, the control unit 48 drives the reading unit 24, the feeding motor 28, and the conveyance motor 29 based on the detection results of the document detection unit 31, the feeding detection unit 38, the double feed detection unit 39, and the conveyance detection unit 32. To control.

  Next, a feeding method in the image reading apparatus 11 will be described based on an image reading processing routine with reference to a flowchart shown in FIG. This image correction routine is executed at the timing when a job for reading an image is started.

  As shown in FIG. 8, the control unit 48 drives the feeding motor 28 and the conveyance motor 29 in step S101 to feed the document D to the feeding unit 18 (first feeding step). In step S <b> 102, the control unit 48 determines whether or not the document D is being double-fed based on the detection result of the double-feed detection unit 39.

  If the double feed detection unit 39 has not detected double feed (step S102: NO), in step S103, the control unit 48 determines whether or not there is a hole 41 in the document D based on the detection result of the feed detection unit 38. Judging. If the feeding detection unit 38 has not detected the hole 41 (step S103: YES), the control unit 48 determines whether or not the conveyance detection unit 32 has detected the leading edge of the document D in step S104. to decide. That is, when the conveyance detection unit 32 does not detect the document D (step S104: NO), the control unit 48 determines that the document D is not conveyed to the conveyance detection unit 32, and the process is performed in step S102. Migrate to

  When the conveyance detection unit 32 detects the document D, the control unit 48 determines that the leading edge of the document D has been conveyed to the conveyance detection unit 32 (step S104: YES). In step S105, the holeless feeding processing routine is executed. Run.

  In step S103, when the feeding detection unit 38 detects the hole 41 of the document D (step S103: NO), in step S106, the control unit 48 executes a feeding process routine with a hole.

  In subsequent step S <b> 107, the control unit 48 determines whether or not the trailing edge of the document D has passed the reading unit 24. That is, for example, when the predetermined time has not elapsed since the conveyance detection unit 32 switched from the state in which the conveyance detection unit 32 has detected the document D to the state in which it is not detected, the rear end of the document D passes through the reading unit 24. It is judged that it is not, and waits (step S107: NO). When a predetermined time has elapsed after the conveyance detection unit 32 switches from the state in which the document D is detected to the state in which the document D is not detected, the control unit 48 determines that the trailing edge of the document D has passed the reading unit 24. (Step S107: YES).

  Then, in step S108, the control unit 48 ends the image reading by the reading unit 24, stops the transport motor 29 in step S109, and ends the image reading processing routine.

  In step S102, when double feed is detected by the double feed detection unit 39 (step S102: YES), the control unit 48 stops the feed motor 28 in step S110, and the process proceeds to step S108. .

Next, the holeless feeding process routine in step S105 (see FIG. 8) will be described with reference to the flowchart shown in FIG.
As shown in FIG. 9, in step S <b> 201, the control unit 48 stops the feeding motor 28. Furthermore, the control unit 48 causes the reading unit 24 to start reading an image in step S202.

  In step S <b> 203, the control unit 48 determines whether or not the document D is being double-fed based on the detection result of the double-feed detection unit 39. If the double feed detection unit 39 does not detect double feed (step S203: NO), the control unit 48 determines whether the feed detection unit 38 has detected the trailing edge of the document D in step S204. Is determined (rear end detection step).

  That is, when the feeding detection unit 38 detects the document D, the control unit 48 determines that the trailing end of the document D has not passed through the feeding detection unit 38 (step S204: NO). The process proceeds to step S203. When the detection result of the feed detection unit 38 changes from the state in which the document D is detected to the state in which the document D is not detected, the control unit 48 determines that the feed detection unit 38 has detected the trailing edge of the document D. (Step S204: YES).

  In step S <b> 205, the control unit 48 determines whether or not the next document D is placed on the placement unit 16 based on the detection result of the document detection unit 31. When the document D is placed on the placement unit 16 (step S205: NO), the process proceeds to step S101 (second feeding step). That is, the control unit 48 feeds the next document D when the trailing edge of the document D is detected by the feed detection unit 38.

  If the next document D is not placed on the placement unit 16 (step S205: YES), the control unit 48 ends the holeless feeding process routine, and the process proceeds to step S107. .

  In step S203, when double feed is detected by the double feed detection unit 39 (step S203: YES), the control unit 48 stops the feed motor 28 in step S206, and the process proceeds to step S108. .

Next, with reference to the flowchart shown in FIG. 10, the feeding process routine with holes in step S106 (see FIG. 8) will be described.
As shown in FIG. 10, in step S <b> 301, the control unit 48 determines whether or not the document D is being double-fed based on the detection result of the double-feed detection unit 39.

  If the double feed detection unit 39 has not detected double feed (step S301: NO), in step S302, the control unit 48 determines whether or not the conveyance detection unit 32 has detected the leading edge of the document D. If the conveyance detection unit 32 has not detected the document D (step S302: NO), the process proceeds to step S301.

  When the conveyance detection unit 32 detects the document D, the control unit 48 determines that the leading edge of the document D has been conveyed to the conveyance detection unit 32 (step S302: YES), and stops the feeding motor 28 in step S303. To do. Further, the control unit 48 causes the reading unit 24 to start reading an image in step S304.

  In step S <b> 305, the control unit 48 determines whether or not the document D is being double-fed based on the detection result of the double-feed detection unit 39. If the double feed detection unit 39 has not detected double feed (step S305: NO), the control unit 48 determines whether the conveyance detection unit 32 has detected the trailing edge of the document D in step S306. Judging.

  That is, when the conveyance detection unit 32 detects the document D, the control unit 48 determines that the trailing end of the document D has not passed through the conveyance detection unit 32 (step S306: NO), and the processing thereof. The process proceeds to step S305. When the detection result of the conveyance detection unit 32 is changed from the state in which the document D is detected to the state in which the document D is not detected, the control unit 48 determines that the conveyance detection unit 32 has detected the trailing edge of the document D (step). S306: YES).

  In step S <b> 307, the control unit 48 determines whether or not the next document D is placed on the placement unit 16 based on the detection result of the document detection unit 31. When the document D is placed on the placement unit 16 (step S307: NO), the process proceeds to step S101. If the document D is not placed on the placement unit 16 (step S307: YES), the control unit 48 ends the hole-feeding processing routine.

  In step S301 and step S305, when double feed is detected by the double feed detection unit 39 (step S301, step S305: YES), in step S308, the control unit 48 stops the feeding motor 28 and performs processing. To step S108.

Next, the operation of the image reading apparatus 11 will be described.
When a job is input to the image reading apparatus 11, the control unit 48 drives the feed motor 28 and the carry motor 29 to feed and carry the document D.

  When the conveyance detection unit 32 detects the leading edge of the document D, the control unit 48 stops the feeding motor 28. That is, since the transport motor 29 is driven, the transport roller 22 rotates and transports the document D, and the feeding roller 19 rotates with the document D transported by the transport roller 22. On the other hand, the frictional force applying unit 20 rotates in the reverse direction and continues to apply a frictional force to the document D. Then, the reading unit 24 reads an image of the document D at a timing when the document D passes.

  The control unit 48 detects that the feeding detection unit 38 detects the leading edge of the document D after the feeding detection unit 38 detects the leading edge of the document D until the conveyance detection unit 32 detects the leading edge of the document D. The timing for feeding the next original D is changed depending on whether or not the above is detected. That is, when the feeding detection unit 38 does not detect the hole 41, the control unit 48 drives the feeding motor 28 using the detection of the trailing edge of the document D by the feeding detection unit 38 as a trigger. When the feeding detection unit 38 detects the hole 41, the control unit 48 drives the feeding motor 28 using the detection of the trailing edge of the document D by the conveyance detection unit 32 as a trigger.

According to the above embodiment, the following effects can be obtained.
(1) Since the feed detection unit 38 is provided so as to overlap the feed roller 19 in the transport direction Y, the feed detection unit 38 is provided downstream of the feed roller 19 in the transport direction Y. Compared to the above, the fed document D can be detected earlier. Therefore, for example, by feeding the document D based on the detection result of the feed detection unit 38, the interval from the completion of feeding of the previous document D to the feeding of the next document D is shortened. Throughput can be improved.

  (2) Since the feed detection unit 38 is provided at a position upstream of the transport roller 22 in the transport direction Y, the feed detection unit 38 is positioned downstream of the transport roller 22 in the transport direction Y. Compared with the case of providing, the interval between the originals D in the transport direction Y can be narrowed.

  (3) Since the feed detection unit 38 is provided on the upstream side in the transport direction Y with respect to the double feed detection unit 39, the feed detection unit 38 is located on the downstream side in the transport direction Y with respect to the double feed detection unit 39. Compared with the case where it is provided at the position, the distance between the originals D in the transport direction Y can be narrowed.

  (4) The feed detection unit 38 is provided on the side opposite to the double feed detection unit 39 across the center of the transport path 17. That is, since the feed detection unit 38 is provided at a position away from the double feed detection unit 39 in the width direction X, a space for providing the feed detection unit 38 can be easily secured.

  (5) Since the feed detection unit 38 is provided at a position different from the storage unit 35, the feed detection unit 38 is exposed when the storage unit 35 is exposed to the outside, for example, when the feed roller 19 is replaced. The possibility of exposing 38 to the outside can be reduced.

  (6) The feed detection unit 38 is provided on the opposite side of the power transmission unit 36 across the center of the conveyance path 17. That is, since the feed detection unit 38 is provided at a position away from the power transmission unit 36 in the width direction X, a space for providing the feed detection unit 38 can be easily secured.

  (7) In the so-called bible size document D, a hole 41 for passing through the ring may be formed along the long side. Since the feed detection unit 38 is provided at a position through which the hole 41 formed in the bible-size document D passes, the feed detection unit 38 can detect the hole 41 formed in the document D.

In addition, you may change the said embodiment as follows.
In the above-described embodiment, the image reading device 11 may read an image of the document D by feeding a carrier sheet sandwiching the document D. The carrier sheet is formed by bonding one end of two transparent sheets, and is used when reading a document D having a nonstandard size in two. By the way, since the carrier sheet is a transparent sheet, when an optical sensor is used for the feed detection unit 38, the rear end of the carrier sheet cannot be detected by the feed detection unit 38. Therefore, when the image of the document D is read using the carrier sheet, the next document D may be fed to the feeding unit 18 when the conveyance detection unit 32 detects the trailing edge of the carrier sheet. Note that the user may input from an input unit (not shown) whether the reading target is the document D or the document D sandwiched between carrier sheets. Alternatively, a detection portion may be provided on the carrier sheet, and the feeding detection portion 38 may detect the detection portion of the carrier sheet.

  In the above embodiment, when the width W of the document D is smaller than twice the distance A between the center line L1 and the feed detection unit 38, the conveyance detection unit 32 detects the trailing edge of the document D. In this case, the next document D may be fed to the feeding unit 18. That is, when the conveyance detection unit 32 detects the document D without the feeding detection unit 38 detecting the document D, the control unit 48 executes the processing from step S303 of the holed feeding processing routine shown in FIG. Also good.

  In the above-described embodiment, when the feeding detection unit 38 detects the hole 41, the control unit 48 may execute a process set in accordance with the document D of the bible size. This process can be arbitrarily set such as a combining process for combining the front and back images of the document D read by the pair of reading units 24 and a process for acquiring character information.

  In the above embodiment, the control unit 48 detects the feed detection unit 38 between the time when the feed detection unit 38 detects the leading edge of the document D and the time when the conveyance detection unit 32 detects the leading edge of the document D. When the number of holes 41 in the original D is one, the next original D may be fed using the detection of the trailing edge of the original D by the feeding detection unit 38 as a trigger. That is, when the feeding detection unit 38 detects a plurality of holes 41, the next document D may be fed using the detection of the trailing edge of the document D by the conveyance detection unit 32 as a trigger.

  In the above embodiment, the document detection unit 31, the conveyance detection unit 32, the feed detection unit 38, and the double feed detection unit 39 may be any detection unit such as a contact type or a non-contact type. For example, the feeding detection unit 38 may be a contact type sensor having a lever. Further, for example, the feeding detection unit 38 may be an image sensor, and the document D may be detected by image processing.

In the above embodiment, the discharge roller 25 and the discharge driven roller 26 may not be provided.
In the above embodiment, the feed detection unit 38 may be provided at a position less than 35 mm from the center line L1 in the width direction X. Further, the feeding detection unit 38 may be provided at a position away from the center line L1 in the width direction X by 40 mm.

  -In above-mentioned embodiment, you may provide the feed detection part 38 in the power transmission part 36 side rather than the center line L1. Moreover, you may provide the power transmission part 36 in the feed detection part 38 side rather than the center line L1.

  In the above embodiment, the image reading device 11 may be configured not to include the feeding motor 28. For example, the conveyance motor 29 and the power transmission unit 36 may be connected, and whether or not the driving force of the conveyance motor 29 is transmitted to the feeding roller 19 by the power transmission unit 36 may be switched.

In the above embodiment, the feed detection unit 38 may be provided in the storage unit 35 together with the feed roller 19.
In the above embodiment, the image reading device 11 may be configured not to include the storage unit 35.

  In the above embodiment, the feed detection unit 38 may be provided on the double feed detection unit 39 side with respect to the center line L1. Further, the double feed detection unit 39 may be provided closer to the feed detection unit 38 than the center line L1.

  In the above embodiment, the configuration may be such that the transport roller 22 is not provided. That is, the document D fed by the feeding unit 18 may be transported and discharged by the discharge roller 25 after being transported to the discharge roller 25 by the feed roller 19.

  In the above embodiment, the feeding detection unit 38 may be provided at the center position in the width direction X in the conveyance path 17. That is, the feeding detection unit 38 may be provided on the center line L1. When a plurality of feeding rollers 19 are provided in the width direction X, the feeding detection unit 38 may be provided at a position between the feeding rollers 19 in the width direction X.

In the above embodiment, the frictional force applying unit 20 may be a separation pad that holds the document D together with the feeding roller 19 and separates the documents D from each other.
In the above-described embodiment, the image reading device 11 is not limited to the sheet feed type, and may be a flat bed type image reading device including an automatic document feeding device (auto sheet feeder) that automatically feeds the document D. . Further, the image reading apparatus 11 may be applied to a multi-function apparatus configured integrally with a printing apparatus, a FAX having a communication function, or the like.

  A ... interval, B ... detection area, D ... original, H ... height, L1 ... center line, L2 ... center line, P1 ... clamping position, P2 ... intersection position, T ... tangent, W ... width, W1 ... dimension, X ... width direction, Y ... transport direction, Φ ... diameter, 11 ... image reading device, 12 ... main body, 13 ... shaft, 14 ... rotating part, 16 ... mounting part, 17 ... transport path, 18 ... feeding , 19 ... feed roller, 20 ... friction force application unit, 22 ... conveying roller, 23 ... conveyance driven roller, 24 ... reading unit, 25 ... discharge roller, 26 ... discharge driven roller, 27 ... discharge unit, 28 ... feed Feed motor (an example of a drive source), 29 ... Conveyance motor, 31 ... Document detection section, 32 ... Conveyance detection section, 34 ... Guide section, 35 ... Storage section, 36 ... Power transmission section, 37 ... Cover, 38 ... Feed Detecting unit, 39 ... double feed detecting unit, 41 ... hole, 43 ... light emitting unit, 44 ... light receiving unit, 45 ... transmitter 46 ... receiving unit, 48 ... control unit.

Claims (8)

Friction in the direction opposite to the conveyance direction between a feeding roller that feeds the document from a placement unit on which the document can be placed toward the conveyance path, and the document that is fed by the feeding roller A feeding part having a frictional force applying part for applying a force;
A feeding detection unit capable of detecting the document fed by the feeding unit;
A reading unit that reads an image of the document that is transported from the upstream side toward the downstream side in the transport direction along the transport path;
With
The feeding detection unit includes a clamping position where the feeding roller and the frictional force applying unit sandwich the document, and a tangent to the feeding roller on the downstream side in the conveyance direction from the clamping position. And an intersecting position intersecting at right angles to the conveying direction in the conveying direction, and is provided at a position different from the feeding roller in the width direction intersecting the conveying direction. apparatus. A transport roller that transports the document along the transport direction;
The image reading apparatus according to claim 1, wherein the feeding detection unit is provided at a position upstream of the transport roller in the transport direction. A double feed detection unit capable of detecting double feed of the document;
The image reading apparatus according to claim 1, wherein the feeding detection unit is provided at a position upstream of the double feeding detection unit in the transport direction.   The image reading according to claim 3, wherein the multi-feed detection unit is provided on one side across the center of the conveyance path in the width direction, and the feed detection unit is provided on the other side. apparatus. A storage section for storing the feeding roller;
The image reading apparatus according to claim 1, wherein the feeding detection unit is provided at a position different from the storage unit.   In the width direction, a power transmission unit that transmits a driving force of a driving source to the feeding roller is provided on one side across the center of the conveyance path, and the feeding detection unit is provided on the other side. The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus.   7. The image reading according to claim 1, wherein the feeding detection unit is provided at a position of 35 mm or more and 40 mm or less from a center of the conveyance path in the width direction. apparatus. Friction in the direction opposite to the conveyance direction between a feeding roller that feeds the document from a placement unit on which the document can be placed toward the conveyance path, and the document that is fed by the feeding roller A feeding part having a frictional force applying part for applying a force;
A feeding detection unit capable of detecting the document fed by the feeding unit;
A reading unit that reads an image of the document that is transported from the upstream side toward the downstream side in the transport direction along the transport path;
With
The feeding detection unit includes a clamping position where the feeding roller and the frictional force applying unit sandwich the document, and a tangent to the feeding roller on the downstream side in the conveyance direction from the clamping position. A feeding method in an image reading apparatus provided at a position different from the feeding roller in a width direction intersecting the transport direction, and a position between the intersecting positions intersecting at right angles to the transport direction Because
A first feeding step for feeding the document to the feeding unit;
A trailing edge detection step in which the feeding detection unit detects a trailing edge of the document;
And a second feeding step of feeding the next document when the trailing edge of the document is detected by the feeding detection unit.

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