JP6700598B2 - Image reading device, feeding method - Google Patents

Description

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

  2. Description of the Related Art Conventionally, there has been known an image reading apparatus including a pickup roller that feeds a document placed on a document tray (placement unit) to a conveyance path, and a reading unit that reads an image of the fed document ( 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 when the document detection sensor detects the leading edge of the document, the reading unit starts reading, and the document detection sensor detects the trailing edge of the document. That was the trigger to feed the next manuscript.

JP, 2005-195442, A

  By the way, a document may have a binding hole called a punch hole for binding the documents. Therefore, in the image reading apparatus, the binding hole may be erroneously detected as the trailing edge of the document and the next document may be fed.

  The present invention has been made in view of these circumstances, and an object thereof is to provide an image reading apparatus and a feeding method that can reduce the risk of feeding originals in an overlapping state.

Hereinafter, the means for solving the above-mentioned problems and the effects thereof will be described.
An image reading apparatus that solves the above-mentioned problems can detect a document feeding unit that feeds the document from a placing unit on which a document can be placed toward a conveyance path, and the document fed by the feeding unit. A feeding detection unit, a conveyance detection unit that can detect the original document conveyed from the upstream side to the downstream side of the conveyance path in the conveyance direction, a reading unit that reads an image of the conveyed document, and A control unit that controls the driving of the feeding unit, wherein the feeding detection unit and the conveyance detection unit output a detection signal that detects the original document and a non-detection signal that does not detect the original document, and the control unit The number of times the feeding detection unit outputs the non-detection signal is one time between the feeding detection unit outputting the detection signal and the conveyance detection unit outputting the detection signal. In the following cases, when the feeding detection unit outputs the non-detection signal after the conveyance detection unit outputs the detection signal, the feeding unit is driven, and when the output count is two or more times, When the conveyance detecting unit outputs the non-detection signal, the feeding unit is driven.

  Some manuscripts have a plurality of holes formed in rows, such as a loose leaf or a refill of a notebook. Then, when the hole passes the feeding detection unit, the feeding detection unit outputs a non-detection signal that does not detect the document. Therefore, for example, when feeding is performed with the row of holes and the transport direction being matched, the feeding detection unit may output the non-detection signal twice or more. Further, for example, when a document is fed with the row of holes and the transport direction orthogonal to each other, the non-detection signal output by the feeding detection unit is once or less. Then, according to this configuration, the control unit controls the driving of the feeding unit based on the number of times the non-detection signal is output. That is, when the feeding detection unit outputs the non-detection signal a plurality of times and there is a high possibility that the hole formed in the document is erroneously detected as the trailing edge of the document, the control unit causes the conveyance detection unit to detect the non-detection. When the signal is output, the feeding unit is driven. Therefore, it is possible to reduce the risk that the originals are fed in an overlapping state.

In the image reading apparatus, it is preferable that the feeding detection unit is provided at a position different from the center of the conveyance path in the width direction intersecting the conveyance direction.
The document holes are often formed at the edges of the document. Further, according to this configuration, since the feeding detection unit is provided at a position different from the center in the width direction, the feeding detection unit is provided at a position different from the case where the feeding detection unit is provided at the center in the width direction. The probability of detecting a hole can be increased.

  In the image reading apparatus, the feeding detection unit includes a light emitting unit that emits light and a light receiving unit that receives the light emitted from the light emitting unit, and the conveyance detection unit is a contact unit that contacts the document. It is preferable to have

  According to this configuration, the feeding detection unit including the light emitting unit and the light receiving unit and the conveyance detection unit including the contact unit detect the document by different methods. Therefore, it is possible to reduce the possibility that the detection units of both the feeding detection unit and the conveyance detection unit may erroneously detect the hole formed in the document as the rear end of the document.

In the image reading apparatus, it is preferable that the feeding detection unit and the conveyance detection unit are provided at different positions in a width direction intersecting the conveyance direction.
According to this configuration, the feeding detection unit and the conveyance detection unit are provided at different positions in the width direction. Therefore, when the document is fed with the row of holes and the feeding direction aligned, and the feeding detection unit detects a plurality of holes, the feeding detection unit does not detect the holes. Therefore, by feeding the next document based on the detection result of the conveyance detection unit, it is possible to reduce the possibility that the documents are fed in an overlapping state.

  In the image reading apparatus, it is preferable that the feeding detection unit is provided at a position that is 35 mm or more and 40 mm or less from the center of the transport path in the width direction intersecting the transport direction.

  A so-called bible-sized document may have holes formed along its long sides for passing through a ring. Further, according to this configuration, since the feeding detection unit is provided at the position where the hole formed in the bible-size document passes, the feeding detection unit can detect the hole formed in the document.

  A feeding method for solving the above-mentioned problems can detect a feeding unit that feeds the document from a placing unit on which the document can be placed toward a conveyance path, and the document fed by the feeding unit. A feeding detection unit, a conveyance detection unit that can detect the document that is conveyed from the upstream side to the downstream side in the conveyance direction in the conveyance direction, and a reading unit that reads an image of the conveyed document. The feeding detection unit and the conveyance detection unit are a feeding method in an image reading apparatus that outputs a detection signal that detects the original document and a non-detection signal that does not detect the original document. A first feeding step of feeding the original document, a feeding signal acquisition step of acquiring the detection signal output from the feeding detection section, and a conveyance for acquiring the detection signal output from the conveyance detection section A signal acquisition step and a second feeding step for feeding the next original by the feeding section, and the feeding detection section to the conveyance signal acquisition step from the feeding signal acquisition step to the conveyance signal acquisition step. When the number of outputs of the non-detection signal is one or less, when the non-detection signal is output from the feeding detection unit after the carrier signal acquisition step, the second feeding step is started, When the number of outputs is two or more, the second feeding step is started when the non-detection signal is output from the transport detection unit.

  According to this structure, the same effect as that of the image reading apparatus can be obtained.

FIG. 1 is a schematic diagram of an embodiment of an image reading device. The schematic plan view of a main body part. Schematic diagram of a bible-sized document. FIG. 3 is a schematic diagram of a document and a feeding detection unit. FIG. 3 is a schematic diagram of a document and a feeding detection unit. The block diagram of a control part. 3 is a schematic cross-sectional view of a document and a graph showing the amount of light received by a light receiving unit. The flowchart of an image reading process routine.

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

  As shown in FIG. 1, the image reading apparatus 11 includes a main body 12 having a substantially trapezoidal box shape in a side view, and a rotating portion 14 that is rotatable around a shaft 13 provided on the main body 12. There is. That is, the rotating portion 14 rotates between the closed position shown by the solid line in FIG. 1 and the open position shown by the chain double-dashed 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 placed in a stacked state, and from the placement unit 16 to the conveyance path 17 indicated by a chain line in FIG. And a feeding unit 18 that operates. The feeding unit 18 includes a feeding roller 19 that feeds the document D, and a frictional force applying unit 20 that generates a frictional force between the document D fed by the feeding roller 19. .. The frictional force imparting unit 20 of the present embodiment is a separation roller that rotates in contact with the documents D to separate the documents D from each other.

  Further, at a position downstream of the feeding unit 18 in the transport direction Y, a transport unit 21 that transports the document D fed by the feeding unit 18 from the upstream side to the downstream side in the transport direction Y is provided. There is. The transport unit 21 includes a transport roller 22 that transports the document D, and a transport driven roller 23 that is rotated by rotation of the transport roller 22. The transport roller 22 and the transport driven roller 23 are provided so as to sandwich the transport path 17.

  Then, at a position on the downstream side in the transport direction Y with respect to the transport unit 21, at least one (a pair in the present embodiment) reading unit 24 that scans the image of the transported document D is main-scanned on both sides of the transport path 17. It is provided so as to extend in the direction (width direction X).

  That is, the reading unit 24 provided in the main body unit 12 reads an image on the first surface (for example, the front surface) of the document D that is transported from the upstream side to the downstream side in the transport direction Y in the transport path 17. Further, 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 to the downstream side in the transport direction Y in the transport path 17.

  Further, on the downstream side of the reading unit 24 in the transport direction Y, the discharge roller 25 that discharges the document D from the main body unit 12, the discharge driven roller 26 that is rotated by rotation of the discharge roller 25, and the document D are A discharging unit 27 for discharging is provided.

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

  Further, the feed roller 19, the transport roller 22, and the discharge roller 25 rotate in the forward direction so that the document D is transported from the upstream side to the downstream side in the transport direction Y in accordance with the driving of the transport motor 28 and the transport motor 29. . Then, the frictional force imparting section 20 rotates in the reverse direction so as to apply the frictional force to the document D in the direction opposite to the transporting direction Y as the transporting motor 29 is driven.

  Then, the image reading apparatus 11 includes a placement detection unit 31 capable of detecting the document D placed on the placement unit 16, and a feeding detection unit 32 capable of detecting the document D fed by the feeding unit 18. It has and. Further, the image reading device 11 includes the conveyance detection unit 33 that can detect the document D that is conveyed from the upstream side to the downstream side in the conveyance direction Y in the conveyance path 17, and the feeding unit 18 and the like in the image reading device 11. The control unit 35 controls the drive of each mechanism.

  The feeding detection unit 32 is an optical sensor having a light emitting unit 37 that emits light and a light receiving unit 38 that receives the light emitted from the light emitting unit 37. The light emitting unit 37 and the light receiving unit 38 are arranged at positions facing each other with the transport path 17 in between.

  The conveyance detection unit 33 is located on the downstream side of the feeding detection unit 32 in the conveyance direction Y, and is provided at substantially the same position as the conveyance roller 22 in the conveyance direction Y. Further, the placement detection unit 31 and the conveyance detection unit 33 are contact-type sensors having contact portions 31a and 33a such as levers that come into contact with the document D, and the contact portions 31a and 33a are pushed by the document D and displaced. By doing so, the presence or absence of the document D is detected.

  As shown in FIG. 2, the mounting portion 16 is provided with a pair of guide portions 40 for guiding both ends in the width direction X intersecting the conveyance direction Y of the placed document D. In addition, in FIG. 2, the center positions of the mounting portion 16 and the transport path 17 in the width direction X are indicated by a dashed line as a center line L1 along the transport direction Y. The pair of guide portions 40 are slidable in the width direction X so as to approach each other or be separated from each other so that the respective distances from the center line L1 are equal in the width direction X. Further, the placement detection unit 31 is provided at the center of the placement unit 16 in the width direction X, and the transport detection unit 33 is provided at the center of the transport path 17 in the width direction X.

  The feeding detection unit 32 is provided at a position different from the center of the transport path 17 in the width direction X. That is, the feeding detection unit 32 and the conveyance detection unit 33 are provided at different positions in the width direction X. Specifically, the feeding detection unit 32 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 feeding detection unit 32, and is preferably 35 mm or more and 40 mm or less in accordance with the so-called bible-size document D, and 37 mm or more and It is more preferably 40 mm or less. The detection area B is an area on the conveyance path 17, the light emitting unit 37 emits light toward the detection area B, and the light receiving unit 38 receives the light that has passed through the detection area B.

Next, the bible size document D will be described.
As shown in FIG. 3, the bible size document D is a document D for replacement or supplement 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 often 5 mm to 7 mm, and the dimension W1 from the edge (long side) of the document D to the hole 41 is often 6 mm to 7 mm.

  Further, in FIG. 3, the center line L2 of the document D is shown by a dashed 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 such that the center line L2 of the document D and the center line L1 of the image reading device 11 are aligned with each other, or the center line L2 and the center line L1 are substantially orthogonal to each other. Are delivered and transported. When the center line L2 and the center line L1 are substantially orthogonal to each other, the document D is placed and conveyed such that the hole 41 is located downstream of the center line L2 in the conveyance direction Y. To do.

  The diameter Φ and the dimension W1 of the hole 41 are determined for each document D, but in FIGS. 4 and 5, the document D in which the holes 41 of different types are formed is illustrated to simplify the description. Illustrated.

  Now, as shown in FIG. 4, the feeding detection unit 32 is provided at a position where the distance A from the center line L1 is 35 mm or more and 40 mm or less so that at least a part of the hole 41 of the document D to be fed is fed. The holes 41 can be detected by the feeding detection unit 32, which overlaps the feeding detection unit 32.

  That is, when the diameter Φ is 7 mm, the hole 41 is located within the range of 33.5 mm or more and 41.5 mm or less from the center line L2. Therefore, the distance A is set to 35 mm or more and 40 mm or less, which is a range inside the radius (1.5 mm in this embodiment) of the detection region B with respect to the range in which the hole 41 having the maximum diameter can be formed. The hole 41 having Φ of 7 mm and the feeding detection unit 32 can be overlapped. When the diameter Φ of the hole 41 is 5 mm, at least a part of the hole 41 and the feeding detection unit 32 can be overlapped.

  Then, as shown in FIG. 5, the hole 41 having a diameter Φ of 5 mm is located within a range of 35.5 mm or more and 41.5 mm or less from the center line L2. Therefore, the interval A is set to be 37 mm or more and 40 mm or less, which is a range that is inside by a radius of the detection region B with respect to a range in which the hole 41 having the smallest diameter can be formed, so that the feeding detection unit 32 detects the hole 41. The accuracy can be improved.

Next, the electrical configuration of the image reading device 11 will be described.
As shown in FIG. 6, the control unit 35 drives the reading unit 24, the feeding motor 28, and the conveyance motor 29 based on the detection results of the placement detection unit 31, the feeding detection unit 32, and the conveyance detection unit 33. To control.

Next, a detection method in which the feeding detection unit 32 and the conveyance detection unit 33 detect the document D will be described.
As shown in FIG. 7, the feeding detection unit 32 detects the presence or absence of the document D according to the amount of light received by the light receiving unit 38, and the detection signal S1 detecting the document D and the non-detection signal not detecting the document D. S2 and are output. Specifically, the feeding detection unit 32 outputs the non-detection signal S2 when the amount of received light is greater than the threshold T, and detects when the amount of received light is less than the threshold T because the light is blocked by the document D. The signal S1 is output.

  Further, the conveyance detection unit 33 detects the presence or absence of the document D according to the displacement of the contact portion 31a, and similarly to the feeding detection unit 32, the detection signal S1 that detects the document D and the non-detection signal S2 that does not detect the document D. And output.

  Therefore, the feeding detection unit 32 and the conveyance detection unit 33 output the non-detection signal S2 before the document D is fed, and the signal output at the timing when the leading edge of the document D passes is switched to the detection signal S1. Then, the feeding detection unit 32 and the conveyance detection unit 33 temporarily output the non-detection signal S2 at the timing when the hole 41 passes.

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

  As shown in FIG. 8, the control unit 35 drives the feeding motor 28 and the conveyance motor 29 in step S101 to cause the feeding unit 18 to feed the document D (first feeding process). Then, in step S102, the control unit 35 determines whether or not the feeding detection unit 32 has detected the leading edge of the document D. That is, when the non-detection signal S2 is output from the feeding detection unit 32 and the feeding detection unit 32 does not detect the document D (step S102: NO), the control unit 35 detects that the document D is fed. It is determined that the document D has not been fed to the section 32, and the document D stands by until it is fed.

  When the control unit 35 acquires the detection signal S1 output from the feeding detection unit 32 (feeding signal acquisition step), the control unit 35 determines that the leading edge of the document D has been conveyed to the feeding detection unit 32 (step S102: (YES), the process proceeds to step S103.

  In step S103, the control unit 35 determines whether or not the feeding detection unit 32 has detected the hole 41 formed in the document D. That is, when the signal output from the feeding detection unit 32 is switched from the detection signal S1 to the non-detection signal S2, the control unit 35 determines that the hole 41 has been detected (step S103: YES), and in step S104, The number of outputs of the detection signal S2 is counted up. Then, if the non-detection signal S2 is not output from the feeding detection unit 32, the control unit 35 determines that the hole 41 is not detected (step S103: NO), and in step S105, the control unit 35 It is determined whether the conveyance detection unit 33 has detected the leading edge of the document D.

  That is, when the non-detection signal S2 is output from the transport detection unit 33 and the transport detection unit 33 does not detect the document D (step S105: NO), the control unit 35 determines that the document D reaches the transport detection unit 33. It is determined that the sheet has not been conveyed, and the process proceeds to step S103. When the control unit 35 acquires the detection signal S1 output from the conveyance detection unit 33 (conveyance signal acquisition step), the control unit 35 determines that the leading edge of the document D has been conveyed to the conveyance detection unit 33 (step S105: YES).

  In step S106, the control unit 35 stops the feeding motor 28, and further causes the reading unit 24 to start reading an image in step S107. In subsequent step S108, control unit 35 determines whether or not the number of outputs counted up in step S104 is two or more.

  It should be noted that the number of times of output means the time period from the acquisition of the detection signal S1 output from the feeding detection unit 32 in step S102 to the acquisition of the detection signal S1 output from the transport detection unit 33 in step S105. This is the number of times the non-detection signal S2 is output from the feeding detection unit 32.

  Then, when the output count is one or less (step S108: NO), the control unit 35 shifts the process to step S109. If the output count is two or more (step S108: YES), the control unit 35 shifts the process to step S110.

  In step S109, the control unit 35 determines whether the feeding detection unit 32 has detected the trailing edge of the document D. That is, when the feed detection unit 32 outputs the detection signal S1 and the feed detection unit 32 detects the document D, the control unit 35 determines that the document D does not pass through the feed detection unit 32. And waits (step S109: NO). Then, when the non-detection signal S2 is output from the feeding detection unit 32, the control unit 35 determines that the feeding detection unit 32 has detected the trailing edge of the document D (step S109: YES), and the process is executed. Control goes to step S111.

  Further, in step S110, the control unit 35 determines whether the conveyance detection unit 33 has detected the trailing edge of the document D. That is, when the conveyance detection unit 33 outputs the detection signal S1 and the conveyance detection unit 33 detects the document D, the control unit 35 determines that the document D has not passed through the conveyance detection unit 33. And waits (step S110: NO). Then, when the non-detection signal S2 is output from the conveyance detection unit 33, the control unit 35 determines that the conveyance detection unit 33 has detected the trailing edge of the document D (step S110: YES), and the process proceeds to step S111. Transition.

  In step S111, the control unit 35 determines, based on the detection result of the placement detection unit 31, whether or not the next document D is placed on the placement unit 16. When the document D is placed on the placement unit 16 (step S111: NO), the process proceeds to step S101, and the feeding unit 18 feeds the next document D (second). Feeding process).

  That is, when the output count is less than or equal to 1 in step S108, when the feeding detection unit 32 outputs the non-detection signal S2 after the conveyance detection unit 33 outputs the detection signal S1 in step S105, the control unit 35 feeds the next document D in step S101. If the non-detection signal S2 is output from the conveyance detection unit 33 when the output count is two or more in step S108, the control unit 35 feeds the next document D in step S101.

  Then, when the next document D is not placed on the placement unit 16 (step S111: YES), the control unit 35 determines in step S112 whether the trailing edge of the document D has passed the reading unit 24. To judge. That is, the control unit 35 determines that the trailing edge of the document D has not passed through the reading unit 24, for example, when a predetermined time has not elapsed after the conveyance detection unit 33 outputs the non-detection signal S2. And waits (step S112: NO). Then, when a predetermined time has elapsed after the conveyance detection unit 33 outputs the non-detection signal S2, the control unit 35 determines that the trailing edge of the document D has passed the reading unit 24 (step S112: YES). ).

  Then, the control unit 35 ends the reading of the image by the reading unit 24 in step S113, stops the carry motor 29 in step S114, and ends the image reading processing routine.

Next, the operation of the image reading device 11 will be described.
When a job is input to the image reading apparatus 11, the control unit 35 drives the feeding motor 28 and the conveyance motor 29 to feed and convey the document D.

  When the conveyance detector 33 detects the leading edge of the document D, the controller 35 stops the feeding motor 28. That is, since the transport motor 29 is driven, the transport roller 22 rotates to transport 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 application unit 20 rotates in the reverse direction and continues to apply the frictional force to the document D. Then, the reading unit 24 reads the image of the document D at the timing when the document D passes.

  By the way, the control unit 35 detects the position of the hole 41 detected by the feeding detection unit 32 from the time when the feeding detection unit 32 detects the leading end of the document D until the conveyance detection unit 33 detects the leading end of the document D. The drive of the feeding unit 18 is controlled according to the number. In other words, in the control unit 35, the feeding detection unit 32 outputs the non-detection signal S2 between the feeding detection unit 32 outputting the detection signal S1 and the conveyance detection unit 33 outputting the detection signal S1. The drive of the feeding unit 18 is controlled based on the output count.

  That is, when the document D is conveyed in a state where the center line L2 of the document D is substantially orthogonal to the center line L1 of the image reading device 11, or when the document D without the holes 41 is conveyed. The number of times the non-detection signal S2 is output is 1 or less. In this case, the control unit 35 drives the feeding motor 28 by using the fact that the feeding detection unit 32 detects the rear end of the document D as a trigger. That is, the control unit 35 drives the feeding unit 18 when the feeding detection unit 32 outputs the non-detection signal S2 after the conveyance detection unit 33 outputs the detection signal S1.

  When the bible-size document D is fed so that the center line L1 and the center line L2 coincide with each other, the non-detection signal S2 is output twice or more. In this case, the control unit 35 drives the feeding motor 28 by using the conveyance detection unit 33 detecting the rear end of the document D as a trigger. That is, the control unit 35 drives the feeding unit 18 when the conveyance detection unit 33 outputs the non-detection signal S2.

According to the above embodiment, the following effects can be obtained.
(1) Some originals D have a plurality of holes 41 formed in rows, such as a loose leaf or a refill of a notebook. Then, when the hole 41 passes through the feeding detection unit 32, the feeding detection unit 32 outputs a non-detection signal S2 that does not detect the document D. Therefore, for example, when the rows of the holes 41 are aligned with the transport direction Y for feeding, the feeding detection unit 32 may output the non-detection signal S2 twice or more. In addition, for example, when the document D is fed with the row of holes 41 and the transport direction Y orthogonal to each other, the non-detection signal S2 output by the feeding detection unit 32 is once or less. Then, the control unit 35 controls the driving of the feeding unit 18 based on the number of times the non-detection signal S2 is output. That is, when the feeding detection unit 32 outputs the non-detection signal S2 a plurality of times and there is a high possibility that the hole 41 formed in the document D is erroneously detected as the rear end of the document D, the control unit 35 When the conveyance detection unit 33 outputs the non-detection signal S2, the feeding unit 18 is driven. Therefore, it is possible to reduce the risk that the documents D are fed in an overlapping state.

  (2) The holes 41 of the document D are often formed on the edge of the document D. Further, since the feeding detection unit 32 is provided at a position different from the center in the width direction X, the feeding detection unit 32 detects the document D in comparison with the case where the feeding detection unit 32 is provided at the center in the width direction X. The probability of detecting the hole 41 can be increased.

  (3) The feeding detection unit 32 including the light emitting unit 37 and the light receiving unit 38 and the conveyance detection unit 33 including the contact unit 31a detect the document D by different methods. Therefore, it is possible to reduce the possibility that the detection units of both the feeding detection unit 32 and the conveyance detection unit 33 erroneously detect the hole 41 formed in the document D as the trailing edge of the document D.

  (4) The feeding detection unit 32 and the conveyance detection unit 33 are provided at different positions in the width direction X. Therefore, when the document D is fed with the row of holes 41 aligned with the conveyance direction Y and the feeding detection unit 32 detects a plurality of holes 41, the conveyance detection unit 33 does not detect the holes 41. Therefore, by feeding the next document D based on the detection result of the conveyance detection unit 33, it is possible to reduce the risk that the documents D are fed in an overlapping state.

  (5) In the so-called bible size document D, there are cases where holes 41 for passing through the ring are formed along the long sides. Since the feeding detection unit 32 is provided at a position where the hole 41 formed in the bible-sized document D passes, the feeding detection unit 32 can detect the hole 41 formed in the document D.

  (6) When the non-detection signal S2 output by the feeding detection unit 32 is output once or less and the possibility that the hole 41 of the document D is erroneously detected as the rear end of the document D is low, The control unit 35 drives the feeding unit 18 when the feeding detection unit 32 outputs the non-detection signal S2. That is, since the interval from the end of the feeding of the original document D to the start of the feeding of the next document D can be shortened, the throughput can be improved.

The above embodiment may be modified as follows.
In the above embodiment, the image reading device 11 may feed the carrier sheet sandwiching the document D and read the image of the document D. The carrier sheet is formed by adhering one end of two transparent sheets, and is used when the original D having a nonstandard size is folded in two and read. By the way, since the carrier sheet is a transparent sheet, the rear end of the carrier sheet cannot be detected by the feeding detection unit 32 when an optical sensor is used for the feeding detection unit 32. Therefore, when the image of the document D is read using the carrier sheet, the feeding unit 18 may feed the next document D when the conveyance detection unit 33 detects the rear end of the carrier sheet. The user may input from the input unit (not shown) whether the reading target is the document D or the document D sandwiched by the carrier sheets. Alternatively, the carrier sheet may be provided with a detected portion, and the feeding detection portion 32 may detect the detected portion of the carrier sheet.

In the above-described embodiment, the frictional force imparting 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, when the width W of the document D is smaller than twice the distance A between the center line L1 and the feeding detection unit 32, the conveyance detection unit 33 detects the rear end of the document D. Alternatively, the feeding unit 18 may feed the next document D.

  In the above-described embodiment, when the number of outputs is two or more, the control unit 35 may execute the process set according to the bible-size document D. It should be noted that this process can be arbitrarily set such as a combining process for combining the images on the front surface and the back surface of the document D read by the pair of reading units 24 and a process for acquiring character information.

  In the above embodiment, the placement detection unit 31, the conveyance detection unit 33, and the feeding detection unit 32 may be any detection unit such as a contact type or a non-contact type. For example, the feeding detection unit 32 may be a contact type sensor having a lever. Further, for example, the transport detection unit 33 may be an optical sensor. Further, the feeding detection unit 32 and the conveyance detection unit 33 may be image sensors that detect the document D by image processing or ultrasonic sensors that detect the document D according to the degree of attenuation of the ultrasonic waves.

In the above embodiment, the discharge roller 25 and the discharge driven roller 26 may not be provided.
-In the above-mentioned embodiment, it is good also as composition which does not have conveyance part 21. That is, the document D fed by the feeding unit 18 may be conveyed to the discharging roller 25 by the feeding roller 19 and then conveyed and discharged by the discharging roller 25.

  -In the said embodiment, you may provide the feeding detection part 32 in the width direction X in the position less than 35 mm from the center line L1. Further, the feeding detection unit 32 may be provided at a position more than 40 mm away from the center line L1 in the width direction X.

  In the above embodiment, the feeding detection unit 32 and the conveyance detection unit 33 may be provided at the same position in the width direction X. Further, the feeding detection unit 32 may be provided at the center position in the width direction X of the transport path 17.

  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 device 11 may be applied to a multi-function peripheral integrated with a printing device, a FAX having a communication function, or the like.

  A... Interval, B... Detection area, D... Original, H... Height, S1... Detection signal, S2... Non-detection signal, L1... Center line, L2... Center line, T... Threshold, W... Width, X... Width Direction, Y... Conveying direction, Φ... Diameter, 11... Image reading device, 12... Main body part, 13... Shaft, 14... Rotating part, 16... Placement part, 17... Conveying path, 18... Feeding part, 19 ... Feed roller, 20... Friction force applying section, 21... Conveying section, 22... Conveying roller, 23... Conveying driven roller, 24... Reading section, 25... Discharging roller, 26... Discharging driven roller, 27... Discharging section, 28 ... Feed motor, 29... Transport motor, 31... Placement detection section, 31a... Contact section, 32... Feed detection section, 33... Transport detection section, 33a... Contact section, 35... Control section, 37... Light emitting section, 38... Light receiving part, 40... Guide part, 41... Hole.

Claims (6)

A feeding unit that feeds the document from a placement unit on which the document can be placed toward the conveyance path,
A conveyance unit that conveys the original document fed by the feeding unit,
A feeding detection unit capable of detecting the document fed by the feeding unit,
A transport detection unit capable of detecting the document transported from the upstream side to the downstream side in the transport direction,
A reading unit for reading the image of the document being conveyed,
A control unit that controls driving of the feeding unit,
The feeding detection unit and the conveyance detection unit output a detection signal detecting the original document and a non-detection signal not detecting the original document,
The control unit stops the feeding unit when the conveyance detection unit outputs the detection signal, and from the feeding detection unit outputting the detection signal to the conveyance detection unit outputting the detection signal. If the number of outputs of the non-detection signal output by the feeding detection unit is 1 or less, the feeding detection unit outputs the non-detection signal after the conveyance detection unit outputs the non-detection signal. Is output, the feeding unit is driven, and when the output count is two or more, the feeding detection unit drives the feeding unit when the non-detection signal is output. .   The image reading apparatus according to claim 1, wherein the feeding detection unit is provided at a position different from a center of the conveyance path in a width direction intersecting the conveyance direction. The feeding detection unit has a light emitting unit that emits light and a light receiving unit that receives the light emitted from the light emitting unit,
The image reading apparatus according to claim 1, wherein the conveyance detection unit includes a contact unit that contacts the document.   The image reading apparatus according to claim 1, wherein the feeding detection unit and the conveyance detection unit are provided at different positions in a width direction intersecting the conveyance direction. .   The feed detection unit is provided at a position that is 35 mm or more and 40 mm or less from the center of the transport path in the width direction intersecting the transport direction. The image reading device described in 1. A feeding unit that feeds the document from a placement unit on which the document can be placed toward the conveyance path,
A conveyance unit that conveys the original document fed by the feeding unit,
A feeding detection unit capable of detecting the document fed by the feeding unit,
A transport detection unit capable of detecting the document transported from the upstream side to the downstream side in the transport direction,
A reading unit for reading an image of the document being conveyed,
Equipped with
The feeding detection unit and the conveyance detection unit are a feeding method in an image reading apparatus that outputs a detection signal detecting the original document and a non-detection signal not detecting the original document,
A first feeding step of feeding the original by the feeding section;
A feeding signal acquisition step of acquiring the detection signal output from the feeding detection unit,
A carrier signal acquisition step of acquiring the detection signal output from the carrier detector,
A second feeding step of feeding the next original by the feeding section,
When the detection signal is output from the conveyance detection unit, the first feeding step is ended, and in the first feeding step, the feeding detection is performed between the feeding signal acquisition step and the conveyance signal acquisition step. When the number of outputs of the non-detection signal from the unit is 1 or less, the second feeding process is performed when the non-detection signal is output from the feeding detection unit after the carrier signal acquisition process. When the output count is two or more, the second feeding step is started when the non-detection signal is output from the conveyance detection unit.

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