JP6976075B2 - Media transfer device - Google Patents

Description

The present invention relates to a control for suppressing the influence of external light on the detection of a transport abnormality in a medium transport device.

Some devices that transport transport media (original documents, cards, etc.) such as scanners, printers, copiers, printing machines, and ATMs (Automated Teller Machines) are provided with an optical sensor for detecting the presence or absence of the transport medium. .. The optical sensor is a pair of a light emitting element and a light receiving element that converts the light energy of the light emitting element into an electric signal, and detects a transport medium by the light receiving signal. A typical light emitting element is an LED, and a typical light receiving element is a phototransistor.

The detection method of the optical sensor is mainly divided into two, one is a reflection method in which the light of the light emitting element is irradiated to the transport medium and the light reflected from the transport medium is received to detect the transport medium, and the other is a reflection method. The first is a transmission method in which the light receiving element is not irradiated with the light by blocking the light of the light emitting element by the transport medium, and the light receiving medium is detected. In both the reflection method and the transmission method, when unintended external light (sunlight, incandescent lamp, etc.) enters the light receiving element, the light receiving element converts the external light into an electric signal, and the detection of the transport medium fails. There is a possibility that it will end up.

On the other hand, Patent Document 1 discloses a technique of turning on / off a light emitting element, determining the presence / absence of a transport medium from the electric signal level of each ON / OFF light receiving element, and preventing erroneous detection due to external light. There is.

Japanese Unexamined Patent Publication No. 2004-269878

However, although the technique disclosed in Patent Document 1 can maintain the accuracy of abnormality detection, there is a problem that the optical sensor cannot be used in a state where external light is incident on the optical sensor.

In view of the above, the medium transport device according to the present invention includes a housing having a medium capture port, a transport means for transporting the medium captured from the medium capture port, a light emitting unit, and a light receiving unit. A plurality of transport medium detection sensors provided along the transport direction by the transport means, a light emitting unit lighting control unit that controls lighting and extinguishing of the light emitting unit, and an output signal of the light receiving unit when the light emitting unit is turned off. Based on the determination results of the external light determination processing unit that determines whether or not the external light incident on the medium intake port is incident on the light receiving unit, and the determination result of the external light determination processing unit, the carrier medium. The control unit includes a control unit that controls the detection control method of the detection sensor, and when the control unit determines that external light is incident on at least one transport medium detection sensor, the control unit determines the transport medium. It is characterized by performing control to disable all detection sensors.

According to the present invention, it is possible to prevent erroneous detection of the transport medium by external light, and even if there is external light, it is possible to detect an abnormality by using a usable optical sensor.

The schematic diagram of the image reading apparatus which concerns on one Embodiment of this invention. The enlarged view of the abnormality detection sensor part of the image reading apparatus which concerns on Example 1. FIG. FIG. 3 is a cross-sectional view of an abnormality detection sensor unit of the image reading device according to the first embodiment. The block diagram of the control unit of the image reader of FIG. The flowchart of the image reading apparatus of Example 1. The flowchart of the image reading apparatus of Example 2. The flowchart of the image reading apparatus of Example 3. The flowchart of the image reader of Example 4. FIG. 1 is a flowchart of the image reader according to the fifth embodiment. FIG. 2 is a flowchart of the image reader according to the fifth embodiment. Example of setting the external light judgment threshold Another enlarged view of the abnormality detection sensor unit of the image reader according to the first embodiment.

(Example 1)
FIG. 1 is a schematic view of an image reading device A as an example of a medium transporting device according to an embodiment of the present invention.

<Device configuration>
The image reading device A takes in one or more transport media S loaded on the mounting table 1 one by one into the device from the media inlet, transports them along the path RT, reads the image, and reads the image, and discharges the tray 2. It is a device that discharges to. The image reading device A is divided into an upper unit 103 and a lower unit 104, and a mechanism for transporting the transport medium S is provided in each unit. The transport medium S to be read is, for example, a sheet of OA paper, a check, a check, a business card, a card, or the like, and may be a thick sheet or a thin sheet. Examples of cards include insurance cards, driver's licenses, credit cards and the like. The transport medium S also includes a booklet such as a passport.

<Paper>
A first transport unit 10 is provided as a feed mechanism for feeding the transport medium S along the route RT. In the case of the present embodiment, the first transport unit 10 includes a feed roller 11 and a separation roller 12 arranged to face the feed roller 11, and the transport medium S taken into the medium intake port from the mounting table 1 is provided. It is sequentially conveyed one by one in the transport direction D1. The driving force is transmitted to the feed roller 11 from the drive unit 3 such as a motor via the transmission unit 5, and is rotationally driven in the direction of the arrow in the figure (the positive direction in which the transfer medium S is conveyed along the path RT). The transmission unit 5 is, for example, an electromagnetic clutch, and the driving force from the driving unit 3 to the feed roller 11 is interrupted. In the present embodiment, the path RT is inclined with respect to the horizontal direction (device installation surface), and the medium S is taken in from the feeding port opened at the upper part of the device in the vertical direction, and the path RT is inclined in the horizontal direction. It is discharged from the lower part of the device in the vertical direction to the outside of the device. The transport path RT may be curved at a part thereof or may be a straight path.

<Drive unit>
The transmission unit 5 that connects the drive unit 3 and the feed roller 11 is, for example, in the present embodiment, in a state in which the drive force is transmitted at the time of feeding, and cuts off the drive force in the case of reverse feed of the transport medium S. do. When the transmission of the driving force is cut off by the transmission unit 5, the feed roller 11 is in a state where it can freely rotate, and the transport medium S is reversely fed by the separation roller 12 that rotates in the reverse direction of the feeding. It should be noted that such a transmission unit 5 may not be provided when the feed roller 11 is driven in only one direction.

<Separation structure>
The separation roller 12 arranged to face the feed roller 11 is a roller for separating the transport media S one by one, and is in pressure contact with the feed roller 11 at a constant pressure. In order to secure this pressure contact state, the separation roller 12 is provided so as to be swingable and is configured to be urged to the feed roller 11. The separation roller 12 is rotationally driven in the direction of the solid arrow (the direction opposite to the forward direction of the feed roller 11) by transmitting the driving force from the drive unit 3 via the torque limiter 12a.

Since the torque limiter 12a regulates the transmission of the driving force, the separation roller 12 rotates in the direction (dashed line arrow direction) around the feed roller 11 when it is in contact with the feed roller 11. As a result, when a plurality of transport media S are transported to the pressure contact portion between the feed roller 11 and the separation roller 12, two or more transport media S are dammed so as not to be transported downstream, leaving one. ..

In the present embodiment, the separation roller 12 and the feed roller 11 form a separation mechanism, but such a separation mechanism does not necessarily have to be provided, and the transport media S are sequentially fed to the path RT one by one. It may be a feeding mechanism. Further, when the separation mechanism is provided, instead of the configuration like the separation roller 12, a separation pad that applies a frictional force to the transport medium S is pressed against the feed roller 11 to have the same separation action. May be.

<Transport structure>
The second transport unit 20 as a transport mechanism on the downstream side in the transport direction of the first transport unit 10 includes a drive roller 21 and a driven roller 22 driven by the drive roller 21, and has been transported from the first transport unit 10. The transport medium S is transported to the downstream side thereof. A driving force is transmitted to the drive roller 21 from a drive unit 4 such as a motor, and is rotationally driven in the direction of the arrow in the figure. The driven roller 22 is in pressure contact with the drive roller 21 at a constant pressure and is brought around to the drive roller 21. The driven roller 22 may be configured to be urged to the drive roller 21 by an urging unit (not shown) such as a spring.

The third transport unit 30 located downstream of the second transport unit 20 in the transport direction includes a drive roller 31 and a driven roller 32 driven by the drive roller 31, and has been transported from the second transport unit 20. The transport medium S is transported to the discharge tray 2. That is, the third transport unit 30 functions as a discharge mechanism. A driving force is transmitted to the drive roller 31 from a drive unit 4 such as a motor, and is rotationally driven in the direction of the arrow in the figure. The driven roller 32 is pressed against the drive roller 31 at a constant pressure and is brought to the drive roller 31. The driven roller 32 may be configured to be urged to the drive roller 31 by an urging unit (not shown) such as a spring.

The discharge tray 2 is pivotally supported via a first hinge provided below the image reading device A so as to be rotatable with respect to the image reading device A. Further, it is composed of a first discharge tray 2a on the first hinge side and a second discharge tray 2b connected to the tip side thereof, and the second discharge tray 2b is rotatable with respect to the first discharge tray 2a. It is supported by the axis.

<Image reading structure, control>
Here, in the image reading device A of the present embodiment, since the image is read by the image reading unit 70 arranged between the second transport unit 20 and the third transport unit 30, the second transport unit 20 and the second transport unit 20 are used. 3 The transport unit 30 transports the transport medium S at a constant speed. By always setting the transport speed to be equal to or higher than the transport speed of the first transport unit 10, it is possible to reliably avoid a situation in which the succeeding transport medium S catches up with the preceding transport medium S. For example, in the present embodiment, the transfer speed of the transfer medium S by the second transfer unit 20 and the third transfer unit 30 is controlled so as to be faster than the transfer speed of the transfer medium S by the first transfer unit 10. bottom.

Even when the transport speed of the transport medium S by the second transport unit 20 and the third transport unit 30 and the transport speed of the transport medium S by the first transport unit 10 are the same conditions, the drive unit 3 is controlled. It is also possible to form a minimum distance between the preceding transport medium S and the succeeding transport medium S by intermittently shifting the feed start timing of the succeeding transport medium S.

<Anomaly detection sensor>
The first abnormality detection sensors 151 to the sixth abnormality detection sensors 156 are provided at equal intervals as shown in FIG. 2 along the transport direction D1 from the pressure contact portion between the feed roller 11 and the separation roller 12. The first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 of the present embodiment are optical sensors, and include a light emitting unit 160 and a corresponding light receiving unit 161. The light emitting unit 160 is an LED. The light receiving unit 161 is a phototransistor capable of sensing the light energy of the LED. In the following description, the abnormality detection sensors 151 to 156 are examples of the transport medium detection sensor, and may be collectively referred to as the abnormality detection sensor 150 in terms of expression.

As shown in FIG. 3, the light emitting unit 160 is arranged in the lower unit 104, and the light receiving unit 161 is arranged in the upper unit 103 on the opposite side of the light emitting unit 160. In the present embodiment, in order to reduce the footprint of the medium transport device and enable space-saving installation, the feed direction from the mounting table 1 is provided so as to be inclined with respect to the device mounting surface for transport. The air supply port of the road RT is provided so as to face the upper side in the vertical direction. According to this configuration, illumination light or the like, which is usually arranged above, easily enters the feeding port, but by providing the light receiving unit 161 in the upper unit 103, external light directly enters the light receiving unit 161. It's getting harder.

Further, by providing the light receiving unit 161 on the upper unit 103, dust and the like are less likely to accumulate, and erroneous detection due to the dust and the like can be prevented. In addition, since the abnormality detection sensor 150 detects the transport medium S on the principle that the light receiving intensity (light receiving amount) changes depending on the arrival or passage of the transport medium S, the light emitting unit 160 and the light receiving unit 161 are combined into one mold component. It may be a photo interrupter summarized in. Although the details of the abnormality detection sensor 150 will be described later, the light emitting unit 160 lights up and the light emitted is detected by the light receiving unit 161. When the transport medium S arrives, the light is blocked and the detected value of the light receiving unit 161 is lowered. By doing so, it is detected that the transport medium S has arrived and has come off. The behavior of the transport medium S is read from the time (timing) when the transport medium S arrives, and if it behaves abnormally, the transport of the transport medium S is stopped and an error is notified to the user.

<Double feed detection>
When the double feed detection sensor 40 arranged between the first transport unit 10 and the second transport unit 20 has the transport media S such as paper in close contact with each other due to static electricity or the like and has passed through the first transport unit 10 ( That is, it is an example of a detection sensor (a sensor that detects the behavior and state of the sheet) for detecting this in the case of a double feed state in which the sheets are carried in an overlapping manner. Various types of double feed detection sensors 40 can be used, but in the case of the present embodiment, they are ultrasonic sensors, which are provided with an ultrasonic wave transmitting unit 41 and a receiving unit 42 thereof, and are a transport medium such as paper. The double feed is detected on the principle that the amount of attenuation of the ultrasonic waves passing through the transport medium S is different between the case where S is double-fed and the case where S is transported one by one.

<Resist sensor>
The medium detection sensor 50 arranged on the downstream side in the transport direction from the double feed detection sensor 40 is on the upstream side of the second transport unit 20 and on the upstream side arranged on the downstream side of the first transport unit 10. It is an example as a detection sensor (sensor for detecting the behavior and state of a sheet), and the position of the transport medium S transported by the first transport unit 10, specifically, the position of the transport medium S at the detection position of the medium detection sensor 50. Detects whether the end has reached or passed. Various media detection sensors 50 can be used, but in the case of the present embodiment, the medium detection sensor 50 is an optical sensor, includes a light emitting unit 51 and a light receiving unit 52 thereof, and receives light by reaching or passing through the transport medium S. The transport medium S is detected on the principle that the intensity (light receiving amount) changes.

In the case of the present embodiment, when the tip of the transport medium S is detected by the medium detection sensor 50, the above medium is such that the transport medium S reaches a position where double feed can be detected by the double feed detection sensor 40. The detection sensor 50 is provided on the downstream side of the double feed detection sensor 40 in the vicinity of the detection sensor 50. The medium detection sensor 50 is not limited to the above optical sensor, and for example, a sensor (image sensor or the like) capable of detecting the end of the transport medium S may be used, or a lever type sensor protruding from the path RT may be used. It may be a sensor.

A medium detection sensor 60 different from the medium detection sensor 50 is arranged on the upstream side of the image reading unit 70. This is an example of a detection sensor on the downstream side arranged on the downstream side of the second transport unit 20, and detects the position of the transport medium S transported by the second transport unit 20. Various media detection sensors 60 can be used, but in the case of the present embodiment, it is an optical sensor like the medium detection sensor 50, and includes a light emitting unit 61 and a light receiving unit 62, and is a transport medium S. The transport medium S is detected on the principle that the light receiving intensity (light receiving amount) changes depending on the arrival or passage. In the present embodiment, the medium detection sensors 50 and 60 are arranged on the upstream side and the downstream side of the second transport unit 20 in the transport direction, respectively, but only one of them may be used.

<Arrangement of CIS>
The image reading unit 70 located on the downstream side of the medium detection sensor 60 is, for example, optically scanned, converted into an electric signal and read as image data, and has a light source such as an LED, an image sensor, and a lens array inside. Etc. are provided. In the case of the present embodiment, the image reading units 70 are arranged one by one on both sides of the path RT, and read the front and back surfaces of the transport medium S. However, one may be arranged only on one side of the path RT, and only one side of the transport medium S may be read. Further, in the present embodiment, the image reading units 70 are arranged facing each other on both sides of the path RT, but for example, they may be arranged at intervals in the direction of the path RT.

<Explanation of block diagram>
The control unit 80 will be described with reference to FIG. FIG. 4 is a block diagram of the control unit 80 of the image reader A.

The control unit 80 includes a CPU 81, a storage unit 82, an operation unit 83, a communication unit 84, and an interface unit 86. The CPU 81 controls the entire image reading device A by executing the program stored in the storage unit 82. The storage unit 82 is composed of, for example, a RAM, a ROM, or the like. The operation unit 83 is composed of, for example, a switch, a touch panel, or the like, and receives an operation from an operator. In this embodiment, it is a touch panel.

The communication unit 84 is an interface for performing information communication with an external device. When a PC (personal computer) is assumed as the external device, the communication unit 84 may include, for example, a USB interface or a SCSI interface. Further, in addition to such a wired communication interface, the communication unit 84 may be used as a wireless communication interface, and may be provided with both wired communication and wireless communication interfaces.

The interface unit 86 is an I / O interface that inputs / outputs data to / from the actuator 85 and the sensor 87. The actuator 85 includes a drive unit 3, a drive unit 4, a transmission unit 5, and the like. The sensor 87 includes an abnormality detection sensor 151 to 156, a double feed detection sensor 40, a medium detection sensor 50 and 60, an image reading unit 70, and the like.

<Drive by receiving start instruction from PC>
The basic operation of the image reader A will be described. When the control unit 80 receives, for example, an image reading start instruction from an external personal computer to which the image reading device A is connected, the control unit 80 starts driving the first to third transport units 10 to 30. The transport media S loaded on the mounting table 1 are transported one by one from the transport medium S located at the bottom thereof.

<Control of abnormality detection sensor>
An abnormality detection sensor 150 is provided to stop the transfer when the transfer medium S behaves abnormally in the vicinity of the feed roller 11 and the separation roller 12. Unless it is determined that the abnormal transport determination condition is satisfied and abnormal behavior is detected, transport is continued. Abnormal behavior is likely to occur when, for example, a thin transport medium S such as a slip is transported.

When the thin transport medium S is separated by the feed roller 11 and the separation roller 12, it tends to jam easily. When a jam occurs, the transport medium S passes through the abnormality detection sensor 150 later than during normal transport. For example, when one transport medium S is normally transported, the passage time T1 of the transport medium S between the first abnormality detection sensor 151 and the third abnormality detection sensor 153, and the third abnormality detection sensors 153 to the fifth. The passing time T2 of the transport medium S between the abnormality detection sensors 155 is substantially the same. However, when jam occurs, the relationship of transit time T1 <transit time T2 tends to occur. The CPU 81 determines that a jam has occurred when the transit times T1 and T2 are different, and stops the transfer. The abnormality determination criterion is an example, and may be appropriately adjusted according to the apparatus.

<Control during double feed>
During the transport, the transport medium S is determined by the double feed detection sensor 40 for the presence or absence of double feed, and if it is determined that there is no double feed, the transport is continued. If it is determined that there is double feed, the transport is stopped, or the take-up of the subsequent transport medium S by the first transport unit 10 is stopped, and the transport medium S in the double feed state is discharged as it is. You may do it.

<Start reading according to the output of the resist sensor>
The control unit 80 starts reading an image of the transport medium S transported by the second transport unit 20 by the image reading unit 70 at a timing based on the detection result of the medium detection sensor 60, and stores the read image in the primary storage. And send to an external personal computer in sequence. The transport medium S from which the image has been read is discharged to the discharge tray 2 by the third transport unit 30, and the image reading process of the transport medium S is completed.

The detailed operation of abnormality detection in the image reading apparatus according to the first embodiment will be described with reference to FIG.

<External light judgment>
After the power is turned on, the light emitting unit 160 of the abnormality detection sensor 150 is turned off (off) by controlling the lighting of the light emitting unit (step S200). With the light emitting unit 160 turned off, the CPU 81, which is an example of the external light determination processing unit, acquires the output value (output signal) of the light receiving unit 161 of the abnormality detection sensor 150 (step S201). The CPU 81 compares the output value of each abnormality detection sensor 150 with the external light determination threshold value stored in the storage unit 82 in advance, and determines whether or not external light is incident (step S202). The light emitting unit lighting control unit may be realized as one function of the CPU 81, or may be configured by an IC or the like different from the CPU 81.

The external light determination threshold value is a threshold value for determining that external light is incident on the abnormality detection sensor 150. For example, when the output value is larger than the external light determination threshold value, it is determined that the amount of external light that affects the detection of the transport medium S is incident on the abnormality detection sensor 150.

In the case of the present embodiment, only one external light determination threshold value is set in common for the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156. However, the external light determination threshold value is not limited to one, and may be set for each of the first abnormality detection sensors 151 to the sixth abnormality detection sensor 156. For example, in the present embodiment, the external light is incident from above the image reader A. That is, the sensor provided upstream of the transport direction D1 is more likely to receive external light, and the sensor provided downstream is less likely to receive external light. Therefore, the external light determination threshold value may be changed depending on the position of each abnormality detection sensor 150 with respect to the transport direction D1.

The details will be described with reference to FIG. FIG. 11 shows the amount of external light incident on the light receiving units 161 of each of the first abnormality detection sensors 151 to the sixth abnormality detection sensors 156 when the light emitting unit 160 is turned off. The amount of external light is displayed in the range of 0 to 255, and when the amount of incident external light increases, it approaches 255. In the present embodiment, as shown in FIG. 1, the path RT is inclined with respect to the mounting surface of the image reader, and the medium intake port opens upward. Therefore, the abnormality detection sensor 150 arranged on the upstream side of the path RT is more likely to receive external light on the light receiving unit 161.

The external light determination threshold TH1 is the first threshold TH1 for the first abnormality detection sensor 151 and the second abnormality detection sensor 152, and the second threshold TH2 is for the third abnormality detection sensor 153 and the fourth abnormality detection sensor 154. TH3 is set as an external light determination threshold TH for the fifth abnormality detection sensor 155 and the sixth abnormality detection sensor 156. When the amount of external light of the first abnormality detection sensor 151 and the second abnormality detection sensor 152 is larger than the first threshold value TH1, the first abnormality detection sensor 151 and the second abnormality detection sensor 152 are invalidated. Similarly, the third abnormality detection sensor 153 to the sixth abnormality detection sensor 156 are invalidated when the amount of external light incident on the light receiving unit 161 is larger than the external light determination threshold value TH. The light incident on the abnormality detection sensor 150 is caused not only by light reflection on the exterior of the apparatus and the arrival of direct light, but also by light reflection on the medium surface mounted on the mounting table 1 and the member forming the path RT. Also occurs.

Returning to FIG. 5, when any one of the output values of the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 is equal to or higher than the external light determination threshold value TH (step S202 YES), the first detection sensor 151 -Disable all of the sixth abnormality detection sensor 156 (step S204). However, although all of them are disabled in this embodiment, only the abnormality detection sensor 150 whose output value is larger than the external light determination threshold TH may be disabled, and the details will be described later. After disabling the abnormality detection sensor 150, the transport medium S is transported without dimming the light emitting unit 160. Further, step S204 may be changed to notify the user that the abnormality detection sensor 150 is disabled. The method of notifying the user will be described in detail in Example 6.

As described above, the CPU 81, which is an example of the control unit, determines whether or not the change condition is satisfied based on the determination result of the external light determination, and controls the detection control method in the abnormality detection sensor 150. Other control methods will be described in sequence.

In step S202, when all the output values of the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 are smaller than the respective external light determination threshold values TH, the amount of external light does not affect the detection of the transport medium S. It is determined that there is (step S202 NO), and the abnormality detection sensor 150 is not invalidated, but the transport medium S is detected.

In this case, the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 are dimmed (step S203). When the dimming is completed, the transfer of the transfer medium S is started (step S205). If any one of the 1st abnormality detection sensor 151 to the 6th abnormality detection sensor 156 cannot finish dimming normally, a dimming error is displayed on the operation unit 83 (as an example, a touch panel) and the user is informed. The operation may be terminated by notifying a dimming error. The timing of the external light determination process shown in FIG. 5 is not limited to that after the power is turned on. For example, it may be performed when the command for transporting the transport medium S is transmitted to the image reading device A via the communication unit 84.

Although the embodiment in which the abnormality detection sensor 150 is dimmed has been described, the present embodiment can be implemented even when the electric circuit has a configuration in which the dimming is not performed. Further, the light emitting unit 160 may have an irradiation structure other than the LED, and any light emitting means may be used as long as the circuit configuration allows ON / OFF control.

Further, the disabled abnormality detection sensor 150 may be enabled from the time when the amount of incident external light becomes smaller than the external light determination threshold TH while continuously conveying the plurality of transport media S. The specific processing will be described in detail in Example 5.

Further, the abnormality detection sensor 150 of this embodiment is not limited to the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156. The above-mentioned external light determination control may be performed on all the optical sensors that detect the transport medium S in the image reader A. In particular, the effect of the present invention is high if the sensor is located at a position where external light is likely to be incident.

(Example 2)
Hereinafter, the second embodiment of the present invention will be described, but since many of the configurations are the same as those of the first embodiment, the description thereof will be omitted and only the different parts will be described.

In the first embodiment, if any one of the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 is larger than the external light determination threshold value TH, all the first abnormality detection sensors 151 to the sixth abnormality detection sensor 156 are invalidated. Was there.

On the other hand, in the second embodiment, when the number of sensors incident with external light exceeds a certain number, all the abnormality detection sensors 151 to 156 are invalidated, and when the number is less than a certain number, the external light is emitted. Only the sensor that is determined to be incident is invalidated. In the case of the second embodiment, it is particularly effective when a plurality of transport medium detection sensors are used for the transport direction D1 to detect an abnormality in the transport medium S. For example, in the present embodiment, the abnormal behavior in the transport of the transport medium S is read from the time when the transport medium S reaches the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156. Therefore, if the plurality of abnormality detection sensors 150 are enabled, the behavior of the transport medium S can be detected.

Therefore, if the number of abnormality detection sensors 150 to be disabled is less than a certain number, all of the first abnormality detection sensors 151 to the sixth abnormality detection sensors 156 are not disabled, and the output value is larger than the external light determination threshold. Disable only sensor 150.

The second embodiment will be described with reference to FIG. In the case of the same processing as in the first embodiment, the description thereof will be omitted. The hardware configuration in the second embodiment is the same as that in the first embodiment. Since steps S200 and S201 of the first embodiment and steps S210 and S211 of the second embodiment are the same, the description thereof will be omitted.

In step S212 of this embodiment, the CPU 81 compares the output values of the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 with the external light determination threshold value TH stored in the storage unit 82 in advance, and determines the external light. It is determined whether or not there are two or more abnormality detection sensors having an output value larger than the threshold value TH.

When two or more of the output values of the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 are larger than the external light determination threshold value TH, all the first abnormality detection sensors 151 to the sixth abnormality detection sensor 156 are invalidated. (Step S215). For example, when the output values of the first abnormality detection sensor 151, the second abnormality detection sensor 152, and the third abnormality detection sensor 153 are larger than the external light determination threshold TH, the fourth abnormality detection sensor 154, the fifteenth abnormality detection sensor 155, and the first 6 Even if the output value of the abnormality detection sensor 156 is smaller than the external light determination threshold TH, all the abnormality detection sensors 150 are invalidated.

When the sensor is disabled, the transport medium S may be transported without dimming the abnormality detection sensor 150 as in the first embodiment, or the user may be notified that the abnormality detection sensor 150 has been disabled. ..

If the output value of the abnormality detection sensor 150 is less than two that is larger than the external light determination threshold value TH, only the abnormality detection sensor 150 whose output value is larger than the external light determination threshold value TH is invalidated (step S213). For example, only the output values of the first abnormality detection sensor 151 and the second abnormality detection sensor 152, which are on the upstream side in the transport direction and are relatively easy to receive external light as compared with other abnormality detection sensors 150, are from the external light determination threshold TH. If it is large, only the first abnormality detection sensor 151 and the second abnormality detection sensor 152 are disabled, and the other abnormality detection sensors 150 detect the transport medium S.

After determining whether the abnormality detection sensor 150 is valid or invalid, dimming the enabled abnormality detection sensor is performed (step S214). When the dimming is completed, the transport medium S is transported (step S216). The abnormality detection sensor 150, which has been disabled in step S214, does not have to be dimmed.

If the dimming cannot be performed normally as in the first embodiment, a dimming error is issued to the user and the operation is terminated.

In this embodiment, in step S212, the number of abnormality detection sensors 150 exceeding the external light determination threshold TH as a condition for transitioning to step S217 is set to two, but the number is not limited to this, for example, three. The above, or a plurality in the transport direction D1 may be used.

(Example 3)
Hereinafter, the third embodiment of the present invention will be described, but since many of the configurations are the same as those of the first embodiment, the description thereof will be omitted and only the different parts will be described.

In the third embodiment, when the output value of the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 is larger than the external light determination threshold value TH meets the combination condition set in the abnormality detection sensor 150. , Disable all abnormality detection sensors 150.

The combination condition in this embodiment is a condition for disabling all of the abnormality detection sensors 150, and as an example of the combination condition in this embodiment,
If external light larger than the external light determination threshold value TH is incident on any of the third abnormality detection sensors 153 to the sixth abnormality detection sensor 156, all the abnormality detection sensors 150 are invalidated.

At this time, external light equal to or higher than the external light determination threshold TH is incident on either or both of the first abnormality detection sensor 151 and the second abnormality detection sensor 152, and the third abnormality detection sensor 153 to the sixth abnormality detection sensor When no external light equal to or higher than the external light determination threshold TH is incident on 156, only two of the first abnormality detection sensor 151 and the second abnormality detection sensor 152 are disabled, and the other third abnormality detection sensors 153 to No. 6 The abnormality detection sensor 156 is enabled.

Similar to the second embodiment, this embodiment is effective when detecting an abnormality in the transport medium S by using a plurality of sensors. Further, depending on the combination conditions, it is possible to prevent sensor erroneous detection due to external light reflected in the image reading device A.

The operation flow of the third embodiment will be described with reference to FIG. 7. In the case of the same processing as in the first embodiment, the description thereof will be omitted. The hardware configuration in the third embodiment is the same as that in the first embodiment. Since steps S200 and S201 of the first embodiment and steps S220 and S221 of the third embodiment are the same, the description thereof will be omitted.

In step S222, the CPU 81 compares the output values of the first abnormality detection sensors 151 to the sixth abnormality detection sensors 156 with the external light determination threshold value TH stored in the storage unit 82 in advance, and is larger than the external light determination threshold value TH. It is determined whether or not the abnormality detection sensor 150, which is the output value, meets the above combination conditions.

When the output value of any of the third abnormality detection sensor 153 to the sixth abnormality detection sensor 156 is equal to or higher than the external light determination threshold value TH (step S222 YES), all the abnormality detection sensors 150 are invalidated (step S225). After disabling all the abnormality detection sensors 150, the transport medium S is transported without dimming as in the first embodiment (step S227), or the user is notified that all the abnormality detection sensors 150 are disabled and the operation is performed. May be terminated.

When the output values of the third abnormality detection sensor 153 to the sixth abnormality detection sensor 156 are all smaller than the external light determination threshold TH (step S222 NO), and the output values of the first abnormality detection sensor 151 and the second abnormality detection sensor 152. When either one or both of them is equal to or higher than the external light determination threshold TH (step S223 No), both the first abnormality detection sensor 151 and the second abnormality detection sensor 152 are disabled (step S224). In the present embodiment, since the transport abnormality of the medium S is detected by using the timing at which the transport medium S passes through both the first abnormality detection sensor 151 and the second abnormality detection sensor 152, either the left or right abnormality detection sensor 150 is detected. If external light larger than the external light determination threshold TH is incident on the object, the timing of passage cannot be accurately acquired. Therefore, when the output value of either the first abnormality detection sensor 151 or the second abnormality detection sensor 152 is equal to or higher than the external light determination threshold value TH, both the first abnormality detection sensor 151 and the second abnormality detection sensor 152 Is disabled. When the timing of passing through both the first abnormality detection sensor 151 and the second abnormality detection sensor 152 is not detected, it is not necessary to disable both sensors, and the output value is the external light determination threshold value TH. Only the larger sensor may be disabled. If the output values of the first abnormality detection sensor 151 and the second abnormality detection sensor 152 are both smaller than the external light determination threshold value TH (step S223 Yes), neither sensor need to be disabled.

When the processing of steps S223 and S224 is completed. Dimming the enabled abnormality detection sensor 150 (step S226). When the dimming is completed, the transport medium S is transported (step S227). The combination conditions are not limited to those of this embodiment. Further, the operation described in this embodiment can be applied not only to the abnormality detection sensor 150 but also to an optical sensor.

(Example 4)
Hereinafter, the fourth embodiment of the present invention will be described, but since many of the configurations are the same as those of the first embodiment, the description thereof will be omitted and only the different parts will be described.

In this embodiment, the abnormality transfer determination condition of the transfer medium S is changed depending on the combination of the abnormality detection sensors 150 that are enabled. The abnormal transport determination condition is a condition for determining the behavior of the transport medium S as abnormal. Specifically, a state in which the passing time T1 and T2 between the respective abnormality detection sensors 150 is less than 3 msec, which is the condition for determining the abnormality transfer, is the initial setting will be described as an example. In this case, if there are more than 4 places where the length is 3 msec or more, it is determined that abnormal behavior has occurred. The abnormal transport determination condition is not limited to the above, and may be appropriately adjusted for each device.

The operation flow of the fourth embodiment will be described with reference to FIG. In the case of the same processing as in the first embodiment, the description thereof will be omitted. The hardware configuration in the fourth embodiment is the same as that in the first embodiment. Since steps S220 and S222 of the third embodiment and steps S230 and S231 of the fourth embodiment are the same, the description thereof will be omitted.

In step S232, when any of the output values of the third abnormality detection sensor 153 to the sixth abnormality detection sensor 156 is larger than the external light determination threshold value TH (step S232 YES), all the abnormality detection sensors 150 are invalidated (step S236). ). After disabling all of the abnormality detection sensors 150, the transport medium S is transported without dimming as in the third embodiment (step S237), or the user is notified that the abnormality detection sensor 150 is disabled and the operation is performed. You may finish.

When all the output values of the third abnormality detection sensor 153 to the sixth abnormality detection sensor 156 are smaller than the external light determination threshold TH (step S232 NO), and the output values of the first abnormality detection sensor 151 and the second abnormality detection sensor 152 When either one or both becomes equal to or higher than the external light determination threshold TH, both the first abnormality detection sensor 151 and the second abnormality detection sensor 152 are disabled (steps S233 and S234). If the output values of the first abnormality detection sensor 151 and the second abnormality detection sensor 152 are both smaller than the external light determination threshold value TH, both sensors are valid.

When the process of step S234 is completed, the abnormal transfer determination condition in the abnormal transfer determination processing unit is changed (step S235). If the first abnormality detection sensor 151 and the second abnormality detection sensor 152 are not disabled in step S233, the process proceeds to step S237 without changing the abnormality transfer determination condition. When the first abnormality detection sensor 151 and the second abnormality detection sensor 152 are disabled, the abnormality transfer determination condition is changed. Specifically, the passing time between the respective abnormality detection sensors is used as the abnormality transfer determination condition, and the sensor intervals are set at 11 points. The first abnormality detection sensor 151 and the second abnormality detection sensor are judged to be abnormal if there are more than four places where the passage time of the sensor interval of the set abnormality detection sensor is longer than the predetermined time. Since 152 is disabled, the sensor interval of the abnormality detection sensor is set at 6 points, and if there are more than 2 points where the passing time is longer than the predetermined time, it is changed to determine that it is abnormal.

When the processing from step S233 to step S235 is completed, the abnormality detection sensor is dimmed (step S237). When the dimming is completed, the transport medium S is transported (step S238). If the dimming cannot be performed normally as in the first embodiment, a dimming error is issued to the user and the operation is terminated.

This embodiment is applicable not only to the abnormality detection sensor 150 but also to an optical sensor. Further, the abnormal transport determination condition is not limited to the method of this embodiment, and may be optimized for each device.

In the present embodiment, the CPU 81 is used as the abnormality transfer determination processing unit, but it may be configured by an IC or the like other than the CPU 81.

(Example 5)
Hereinafter, the fifth embodiment of the present invention will be described, but since many of the configurations are the same as those of the first embodiment, the description thereof will be omitted and only the different parts will be described.

In this embodiment, the light emitting unit 160 of the abnormality detection sensor 150 is turned off even during the distance between the transport media S to determine whether or not external light is incident, and the valid / invalid state of the abnormality detection sensor 150 is changed.

As the timing for turning off the light emitting unit 160 during the interval between the transport media S, the light emitting unit 160 is turned off immediately after the preceding transport medium S has passed the abnormality detection sensor 150.

In the case of this embodiment, the rear end of the preceding transport medium S passes through the first abnormality detection sensor 151 and the second abnormality detection sensor 152 before the other abnormality detection sensors 150. Immediately after the transport medium S is removed, the light emitting unit 160 of the first abnormality detection sensor 151 and the second abnormality detection sensor 152 is turned off. After that, the output value of the light receiving unit 161 is compared with the external light determination threshold value TH, and valid / invalid determination is performed. Similarly, the third abnormality detection sensor 153 to the sixth abnormality detection sensor 156 also turn off the light emitting unit 160 when the rear end of the preceding transport medium S passes, and compare the output value of the light receiving unit 161 with the external light determination threshold value TH. Change the enabled / disabled state of the abnormality detection sensor 150.

When the output value of the abnormality detection sensor 150 becomes equal to or higher than the external light determination threshold value TH while the plurality of transport media S are continuously transported, the abnormality detection sensor 150 is changed from valid to invalid. When the output value becomes smaller than the external light determination threshold value TH, the abnormality detection sensor 150 is changed from invalid to valid.

When the present embodiment is applied in combination with the first embodiment, when the abnormality detection sensor 150 is carried as effective, the output value of any of the abnormality detection sensors 150 is the external light determination threshold value TH in step S202. At the above time, the process proceeds to step S204, and all the abnormality detection sensors 150 are invalidated. When the abnormality detection sensor 150 is disabled, the information of the abnormality detection sensor 150 that has fallen below the external light determination threshold TH is stored in some storage means, and the output values of all the abnormality detection sensors 150 are external light. When the value falls below the determination threshold TH, all the abnormality detection sensors 150 may be enabled.

When the present embodiment is applied in combination with the second embodiment, when the abnormality detection sensor 150 is carried as effective, the output value of any of the abnormality detection sensors 150 is the external light determination threshold TH in step S212. In the above case, the information is stored and the abnormality detection sensor 150 is disabled, and the abnormality detection sensor 150 whose output value is equal to or higher than the external light determination threshold TH satisfies the condition described in the second embodiment. At a time point (for example, the output values of the two abnormality detection sensors 150 are equal to or higher than the external light semi-knowledge position TH), the process proceeds to step S217, and all the abnormality detection sensors 150 may be invalidated. When all the abnormality detection sensors 150 are disabled, some storage means is used to store the information of the abnormality detection sensor 150 that is below the external light determination threshold TH or the information of the abnormality detection sensor 150 that is equal to or higher than the external light determination threshold TH. All the abnormality detection sensors 150 may be enabled when the conditions described in the second embodiment are satisfied.

Similarly, when the present embodiment is applied in combination with the third embodiment, the abnormality detection sensor 150 whose output value is equal to or higher than the external light determination threshold value TH in step S222 is stored in the storage means, and is it a specific combination? When the determination condition is satisfied, the process proceeds to step S225, and in other cases, the process proceeds to step S223.

The same applies to the case where the present embodiment is applied in combination with the fourth embodiment.

The timing of turning off the light emitting unit 160 during the interval between the transport media S, updating the valid / invalid state of the abnormality detection sensor 150, and performing a series of processes up to dimming is not limited to the embodiment of this embodiment. .. When performing a series of processes, it suffices as long as the transport medium S does not depend on the abnormality detection sensor 150, and it is sufficient that the series of processes can be completed by the time the subsequent transport medium S is detected.

(Example 6)
Hereinafter, the sixth embodiment of the present invention will be described, but since many of the configurations are the same as those of the first embodiment, the description thereof will be omitted and only the different parts will be described.

The sixth embodiment describes a method of notifying the user that an external light larger than the external light determination threshold value TH is incident on the abnormality detection.

This embodiment will be described with reference to FIG. In the case of the same processing as in the first embodiment, the description thereof will be omitted. The hardware configuration in this embodiment is the same as that in the first embodiment. Since steps S200 to S205 of the first embodiment and steps S40 to S245 of the sixth embodiment are the same, the description thereof will be omitted.

After disabling all the abnormality detection sensors 150 in step S245, the user is notified that all the abnormality detection sensors 150 have been disabled (step S246). The notification method may be notified by a buzzer sound or a message may be displayed on a screen such as an LCD. In the case of this embodiment, a message is displayed on the touch panel. After notifying the user, the operation ends.

The notification method is not limited to this, and for example, the method of FIG. 10 can be considered. In the case of FIG. 10, the user is notified of the invalidity of the abnormality detection sensor 150 and a message prompting the user to move the image reading device A is displayed.

Steps S250 to S256 are the same as the process of FIG. 9, but the message is continuously displayed until all the output values of the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 become smaller than the external light determination threshold value TH. The process of step S251 is performed at regular intervals, and when the output value of the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 becomes smaller than the external light determination threshold value TH in the process of step S252, the message is erased, and step S253, The process of step S254 is performed.

In the case of a buzzer or the like, the sound is continuously emitted until the output value of the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 becomes equal to or less than the external light determination.

However, regardless of whether the message is displayed on the display unit of the LCD or the like or the notification is made by the sound of a buzzer or the like, the notification to the user is during the transport operation or the medium is loaded on the mounting table 1. You may notify only in cases such as cases. In this case, the user is not notified in an unnecessary state and is not bothered.

The flow shown in FIG. 10 is particularly effective for devices that are easy to carry and move and devices that have a small number of sensors. In particular, a battery having a built-in battery is preferable, and a battery that controls to drive only the abnormality detection sensor and the notification unit and can secure the power for at least a predetermined time is preferable.

(Example 7)
Here, the structure of the paper feed unit according to the embodiment of the present invention will be described with reference to FIG. This structure can be applied to any of Examples 1 to 7, and can be used in combination as appropriate.

FIG. 12 shows a state seen from the rear in the transport direction in parallel with the mounting table 1. As described with reference to FIGS. 2 and 3, the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 are provided with a light receiving unit 161 and a light emitting unit 160 so as to face each other across the transport path RT. There is.

That is, it suffices if each abnormality detection sensor 150 can be arranged at a position where external light does not enter from the feeding port, but as described in the first embodiment, the mounting table 1 is tilted upward, and the supply is provided accordingly. The feeding port opens upward, and the feeding roller 11 and the separating roller 12 are placed at the upstream end position of the transport path RT so that the sheets loaded on the mounting table 1 can be separated and fed one by one from the bottom. It is more difficult than arranging the abnormality detection sensor 150 adjacent to the transport path RT in the image reading device in which the above is arranged, and how to reduce the amount of external light incident from the feeding port is important for the abnormality detection sensor 150. Become. As shown in FIG. 12, a separation roller 12 and a stopper 202 are arranged at the center of the feeding port. The abnormality detection sensor 150 is arranged outside the separation roller 12 and the stopper 202 in the width direction orthogonal to the transfer direction so that the behavior of the transfer medium S during the separation operation can be detected. Due to this arrangement, the abnormality detecting sensor 150 is not arranged to prevent external light on the upstream side, and is in a state of being easily affected by external light.

In the present embodiment, as shown in FIG. 1, a part of the side wall at the upstream end on the feed port side of the upper unit 103 forming the main body housing A is extended to the transport path side to form the eaves 201. ing.

As shown in FIG. 12, a supply port is formed between the mounting table 1 and the exterior member forming the upper unit 103, and the eaves 201 covers the width direction of the transport path RT. There is. This is because the width of the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 can be suitably used for the transport medium S of various sizes (widths) transported along the transport path RT. It is preferable that the light is arranged inside to some extent in the direction, but it is preferable to block the light as much as possible because it is unknown from which angle the external light enters.

The eaves 201 are located on both ends in the width direction and have a large protrusion to the transport path RT side, and the eaves 201 are located in the center of the width direction and have a small protrusion to the transport path RT side. It is composed of a second eaves portion 201b. An inclined surface 204 formed by an exterior member of the upper unit 103 is provided on the downstream side of the eaves 201 (see FIG. 1), and the transport path RT moves in the thickness direction of the transport medium S toward the downstream side in the transport direction. It is becoming narrower than the other.

On the transport direction side of the second eaves 201b, there is a stopper 202 for blocking the transport medium S mounted on the mounting table 1 when the feeding is stopped, and the stopper 202 is separated. It is taken in and out of the transport path RT in conjunction with the rotation of the roller 12. A separation roller cover 203 is arranged on the upstream side of the stopper 202. FIG. 12 shows a so-called standby state in which the transport medium S is not transported, and the stopper 202 projects from above to downward so as to straddle the transport path RT.

The lower end of the separation roller cover 203 protrudes toward the transport path RT from the tip of the second eaves 201b and the tip of the first eaves 201a. By doing so, the amount of external light incident on the first abnormality detection sensor 151 to the sixth abnormality detection sensor 156 is increased by forming the third eaves portion by the stopper 202 while securing the space for providing the stopper 202. It is effectively reduced. Further, if the eaves 201 is projected toward the transport path RT side indiscriminately in order to reduce the external light, the transport medium S mounted on the mounting table 1 is blocked by the eaves 201, which causes a deterioration in the feeding performance. However, by providing the eaves 201 with a protrusion amount smaller than the protrusion amount of the separation roller cover 203, the amount of incident external light is reduced and the feeding performance is ensured at the same time.

In FIG. 12, three stoppers 202 are provided in the width direction orthogonal to the transport direction. By increasing this to the position corresponding to the upstream side of the abnormality detection sensor 150 by one on the left and right, and executing the above-mentioned control of transport abnormality detection while the stopper 202 is down to the transport path immediately before the start of feed. The influence of external light can be further reduced.

(Example 8)
Hereinafter, the control including the paper feed retry function in one embodiment of the present invention will be described. A paper feed retry function that re-drives the feed roller 11 to supply a medium when a preset time or more has elapsed from the start of paper feeding until the medium reaches the medium detection sensor 50. have. This function is an effective means when it takes a long time to feed paper due to the influence of friction of the medium even if there is no abnormality in the transport.

On the other hand, as described in the above embodiment, the image reading device A according to the present invention includes the abnormality detection sensor 150, and passes the position of each abnormality detection sensor 150 with respect to the rotation amount of the motor 3 for driving the feed roller 11. Anomalies in medium transport are detected depending on the time.

The paper feed retry function is a control that keeps rotating the motor 3 that drives the feed roller 11, but the abnormality detection sensor 150 detects the transfer abnormality by comparing with the rotation amount of the motor 3 that drives the feed roller 11. Therefore, if the transport abnormality is detected when the paper feed retry function is executed, the abnormality detection sensor 150 determines that the transport abnormality has occurred. Actually, as described above, even if there is no transport abnormality such as jam in the medium, it may be determined as an abnormality.

On the other hand, in the present embodiment, when the transport abnormality detection function by the abnormality detection sensor 150 is enabled, the paper feed retry function is disabled, so that if jam or the like does not occur in the medium, paper feed is performed. It is configured so that it will not be erroneously detected as a transport error caused by executing a retry.

Further, when the double feed detection sensor 40 determines that double feed has occurred, the feed roller 11 is rotated in the reverse direction to execute a separation retry function for returning the medium to the mounting table 1. ing.

At this time, the feed roller 11 rotates in the reverse direction, so that the medium is returned to the separated portion, separated again, and then conveyed. Here, if the feed roller 11 is configured to perform the transfer abnormality detection operation by the abnormality detection sensor 150 by rotating regardless of whether it is forward or reverse, the separation retry function also detects the transfer abnormality in the same manner. will have to go. However, like the above-mentioned paper feed retry function, the separation retry function does not actually cause a transfer abnormality such as jam.

Therefore, it is preferable to stop the operation of detecting the transport abnormality while the separation retry function is being executed. In the present embodiment, even if the abnormality detection sensor 150 detects that a transport abnormality has occurred during the separation retry operation (reverse rotation of the feed roller 11), the separation retry operation is executed by ignoring it, that is, abnormality detection. The sensor 150 is disabled, the rotation speed of the paper feed motor is reset when the medium is stopped, and the transfer abnormality detection by the abnormality detection sensor 150 is enabled again.

The present invention is not limited to the above-mentioned form. For example, when a medium bundle such as paper is set on a mounting table as an example of the transport medium S, it is conceivable that the light reflected by the uppermost surface of the medium bundle enters the apparatus through the feeding port. Such medium reflection changes depending on the type of the medium, the surface state, and the like. For example, if the medium is relatively black, the reflection of the medium is relatively suppressed, but if the medium is white, the reflection of the medium is likely to occur. In addition, a photographic portion such as a magazine or a medium having a glossy printed surface easily reflects light. In a heterogeneous mixture in which a plurality of types of media are loaded, such a light-reflecting medium may be included in the medium bundle. Therefore, in the process of separating and feeding the media one by one, the amount of light incident on at least one sensor of the abnormality detection sensor group (particularly the sensor arranged on the upstream side in the feeding direction) is detected and predetermined. Anomalous light incidents may be determined one by one based on the threshold value of.

When the media are separated from the medium bundle one by one and an abnormal light incident is detected in the middle, for example, the abnormality detection itself may be disabled or the conditions for the abnormality detection may be changed. Although it is possible, a warning message is displayed to the user with the feeding operation temporarily stopped, and the user is allowed to select the subsequent response, such as selecting whether to continue the feeding operation as it is or to restart the feeding operation. You may do so. If the processing of the medium bundle is automatically interrupted in the middle, some redoing is required, but the separate feeding of the medium bundle may be normally possible even if there is an abnormal light incident, so the user. If you choose to continue, you only have to perform the operation for pausing and continuing after that, so the processing performed up to the pause is not wasted and you can prevent redoing.

As described above, in the present invention, the external light determination processing unit (CPU81) determines that external light is incident on the abnormality detection sensor 150, and the control unit (CPU81) determines that the change condition is satisfied. Occasionally, the detection control method is changed, and the change of the detection control method includes changing the combination of the abnormality detection sensors 150 to be enabled and the external light determination threshold value TH of the abnormality detection sensor 150.

In addition, various modifications can be applied without departing from the gist of the present invention.

A Image reader S Transport medium 1 Mounting table 2 Discharge tray 2a 1st discharge tray 2b 2nd discharge tray 3, 4 Drive unit 5 Transmission unit 10 1st transport unit 11 Feed roller 12 Separation roller 20 2nd transport unit 21 Drive roller 22 Driven roller 30 Third transport unit 31 Driven roller 32 Driven roller 40 Double feed detection sensor 50, 60 Media detection sensor 70 Image reading unit 80 Control unit 84 Communication unit 103 Upper unit 104 Lower unit

Claims (8)

A housing with a media inlet and
A transport means for transporting the medium taken in from the medium take-in port, and a transport means.
A transport medium detection sensor, which is composed of a light emitting unit and a light receiving unit and is provided in plurality along the transport direction by the transport means, and a transport medium detection sensor.
A light emitting unit lighting control unit that controls lighting and extinguishing of the light emitting unit,
An external light determination processing unit that determines whether or not external light incident on the medium intake port is incident on the light receiving unit based on the output signal of the light receiving unit when the light emitting unit is turned off.
A control unit that controls the detection control method of the transport medium detection sensor based on the determination result of the external light determination processing unit is provided.
The control unit
Media bodies before SL outside light determining processing unit and performing the determining that the incident external light to at least one said carrier medium detecting sensor, a pre-SL control to disable all transport medium detection sensor Transport device. A housing with a media inlet and
A transport means for transporting the medium taken in from the medium take-in port, and a transport means.
A transport medium detection sensor, which is composed of a light emitting unit and a light receiving unit and is provided in plurality along the transport direction by the transport means, and a transport medium detection sensor.
A light emitting unit lighting control unit that controls lighting and extinguishing of the light emitting unit,
An external light determination processing unit that determines whether or not external light incident on the medium intake port is incident on the light receiving unit based on the output signal of the light receiving unit when the light emitting unit is turned off.
A control unit that controls the detection control method of the transport medium detection sensor based on the determination result of the external light determination processing unit is provided.
The control unit
When the front SL outside light determining processing unit determines that external light into a plurality said carrier medium detection sensor is incident performs control to disable all the transport medium detecting sensor,
When it is not determined that the external light is incident on the plurality of the transport medium detection sensors, only the transport medium detection sensor determined by the external light determination processing unit to be incident on the external light is invalidated. medium body conveying device and performs control. A housing with a media inlet and
A transport means for transporting the medium taken in from the medium take-in port, and a transport means.
A transport medium detection sensor, which is composed of a light emitting unit and a light receiving unit and is provided in plurality along the transport direction by the transport means, and a transport medium detection sensor.
A light emitting unit lighting control unit that controls lighting and extinguishing of the light emitting unit,
An external light determination processing unit that determines whether or not external light incident on the medium intake port is incident on the light receiving unit based on the output signal of the light receiving unit when the light emitting unit is turned off.
A control unit that controls the detection control method of the transport medium detection sensor based on the determination result of the external light determination processing unit is provided.
The control unit
And characterized in that the determining that the external light is incident on a plurality said carrier medium detection sensor which is set in advance before SL outside light determining processing unit, a pre-SL control to disable all transport medium detection sensor medium body transfer device for. The external light determination processing unit determines that external light is incident on any one or more of the other transport medium detection sensors excluding the transport medium detection sensor located on the most upstream side in the transport direction. If so , the control unit controls to invalidate all the transport medium detection sensors.
The external light determination processing unit determines that the external light is not incident on the other transport medium detection sensor and the external light is incident on the transport medium detection sensor located on the most upstream side in the transport direction. 3. The medium transfer device according to claim 3, wherein the control unit controls to invalidate the transfer medium detection sensor located on the most upstream side in the transfer direction. Based on the previous SL conveying medium detection sensor of the detection result has an abnormal conveyance determination processing unit for determining an abnormality in said medium is being conveyed when abnormality conveyance satisfies the determination condition has occurred,
The abnormality conveyance determination processing unit, by a combination of those not disabled by the control unit in a plurality of the transport medium detecting sensor, any one of claims 1-4, characterized by changing the abnormal conveyance determination condition The medium transfer device according to paragraph 1. Between the time when the medium passes through the transport medium detection sensor and the time when the subsequent medium reaches the transport medium detection sensor, the light emitting unit is turned off and the external light determination processing unit sends external light to the light receiving unit. medium transport device according to any one of claims 1, characterized in that determine the constant whether the incident 5. In the external light determination unit, when the external light is determined to be incident on the carrier medium detecting sensor, further comprising means for notifying that the external light is incident on the carrier medium detecting sensor medium transport device according to any one of claims 1, wherein 6. A housing with a media inlet and
A transport means for transporting the medium taken in from the medium take-in port, and a transport means.
A transport medium detection sensor, which is composed of a light emitting unit and a light receiving unit and is provided in plurality along the transport direction by the transport means, and a transport medium detection sensor.
A light emitting unit lighting control unit that controls lighting and extinguishing of the light emitting unit,
An external light determination processing unit that determines whether or not external light incident on the medium intake port is incident on the light receiving unit based on the output signal of the light receiving unit when the light emitting unit is turned off.
A control unit that controls the detection control method of the transport medium detection sensor based on the determination result of the external light determination processing unit.
Equipped with
The external light determination processing unit has a threshold value for determining that external light is incident on each of the plurality of transport medium detection sensors.
The threshold value, the medium characterized in that towards the threshold value of the carrier medium detecting sensor disposed on the upper stream side is larger than the threshold value of the carrier medium detection sensor that is disposed downstream relative to the conveying direction transport Device.

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