JP2022110456A - Medium conveying device, control method, and control program - Google Patents

Abstract

To provide a medium conveying device, control method, and control program which can stop feeding of a medium earlier when floating of the medium occurs.SOLUTION: A medium conveying device includes: an optical sensor which has a light emitting part and a light receiving part arranged on an outer side from a roller in a direction orthogonal to a medium conveying direction, and generates a light receiving signal corresponding to light emitted from the light emitting part toward an opposite side to the roller, reflected from a fed medium, and received by the light receiving part; a contact sensor which is arranged on an upstream side from the roller in the medium conveying direction and generates a contact signal corresponding to contact with the medium; a first determination part which determines whether floating of the medium occurs on the basis of the light receiving signal; a second determination part which determines whether the floating of the medium occurs on the basis of the contact signal; and a control part which stops feeding of the medium by using only a determination result of the determination part, which previously determines occurrence of the floating of the medium, out of the first determination part and the second determination part.SELECTED DRAWING: Figure 5

Description

The present invention relates to a medium transport device, a control method, and a control program for determining whether or not floating of a medium has occurred.

A medium transport device such as a scanner has a function of separating and feeding a plurality of media. However, if the stapled media is transported while the function to separate and feed multiple media is enabled, the media will float without being separated, resulting in transport problems such as paper jams. can occur. 2. Description of the Related Art In a medium transport device, it is required to stop feeding a medium early so as to prevent damage to the medium when a medium transport abnormality occurs.

A sheet feeding apparatus is disclosed that has a plurality of sheet abnormal shape detection means for detecting abnormal sheet shape states, and that stops the sheet feeding operation according to the detection results of the plurality of sheet abnormal shape detection means ( See Patent Document 1).

Disclosed is a conveying apparatus that has a detecting means for detecting the floating of a sheet passing through the separating means, and stops separating and conveying by the separating means when the detecting means detects the sheet for a predetermined time or longer (see Patent Document 2). ).

JP 2004-182449 A JP 2017-222511 A

In the medium conveying device, it is desired to stop the feeding of the medium earlier when the floating of the medium occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a medium conveying device, a control method, and a control program capable of stopping the feeding of the medium earlier when the medium floats.

A medium conveying device according to one aspect of the present invention includes a roller that feeds a medium, and a light emitting unit and a light receiving unit that are arranged outside the roller in a direction perpendicular to the medium conveying direction. an optical sensor that generates a light reception signal corresponding to the light that is irradiated toward the medium being fed, reflected by the medium being fed, and received by the light receiving unit; a contact sensor that generates a contact signal according to the contact of the contact sensor, a first determination unit that determines whether or not the medium has floated based on the received light signal, and a medium that has floated based on the contact signal medium feeding is performed using only a second determination unit that determines whether the and a control unit for stopping.

Further, a control method according to one aspect of the present invention includes a roller for feeding a medium, and a light emitting unit and a light receiving unit arranged outside the roller in a direction perpendicular to the medium conveying direction. an optical sensor that generates a light reception signal corresponding to the light that is irradiated toward the side, reflected by the medium being fed, and received by the light receiving unit; a contact sensor that generates a contact signal in response to contact with the medium transport device, the medium transport device determining whether or not the medium has floated based on the received light signal; Then, out of the judgment based on the received light signal and the judgment based on the contact signal, only the judgment result of the first judgment that the medium has risen is used to feed the medium. stop sending.

A control program according to one aspect of the present invention includes a roller that feeds a medium, and a light emitting unit and a light receiving unit that are arranged outside the roller in a direction perpendicular to the medium conveying direction. an optical sensor that generates a light reception signal corresponding to the light that is irradiated toward the side, reflected by the medium being fed, and received by the light receiving unit; a contact sensor that generates a contact signal according to contact with the medium transport device, the control program for determining whether or not the medium has floated based on the received light signal; Then, out of the judgment based on the received light signal and the judgment based on the contact signal, only the judgment result of the first judgment that the medium has risen is used to feed the medium. Causes the media transport device to stop feeding.

According to the present invention, the medium conveying device, the control method, and the control program can stop the feeding of the medium earlier when the medium floats.

1 is a perspective view showing a medium conveying device 100; FIG. 4 is a diagram for explaining a transport path inside the medium transport device 100; FIG. FIG. 3 is a schematic diagram for explaining the contact sensor 112 and the like; FIG. 3 is a schematic diagram for explaining the contact sensor 112 and the like; 4A and 4B are schematic diagrams for explaining the operation of the contact sensor 112. FIG. FIG. 4 is a schematic diagram for explaining the operation of the first optical sensor 113; 1 is a block diagram showing a schematic configuration of a medium conveying device 100; FIG. 2 is a diagram showing a schematic configuration of a storage device 140 and a processing circuit 150; FIG. 7 is a flow chart showing an example of the operation of medium reading processing; 7 is a flowchart showing an example of the operation of first determination processing; It is a graph for explaining technical significance. It is a graph for explaining technical significance. It is a graph for explaining technical significance. It is a graph for explaining technical significance. 9 is a flowchart showing an example of the operation of second determination processing; It is a figure which shows schematic structure of the processing circuit 250 which concerns on other embodiment.

A medium conveying device according to one aspect of the present invention will be described below with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to those embodiments, but extends to the invention described in the claims and equivalents thereof.

FIG. 1 is a perspective view showing a media transport device 100 configured as an image scanner. The medium conveying device 100 conveys a medium, which is an original, and captures an image. The medium may be paper, cardboard, card, booklet, or the like. The media transport device 100 may be a facsimile machine, a copier, a printer complex machine (MFP, Multifunction Peripheral), or the like. Note that the medium to be conveyed may be an object to be printed instead of a document, and the medium conveying device 100 may be a printer or the like.

The medium transport device 100 includes a first housing 101, a second housing 102, a mounting table 103, a discharge table 104, an operation device 105, a display device 106, and the like.

The first housing 101 is arranged on the upper side of the medium transporting device 100 and is engaged with the second housing 102 by a hinge so that it can be opened and closed when the medium is clogged or when cleaning the inside of the medium transporting device 100 .

The mounting table 103 is engaged with the second housing 102 so that the medium to be transported can be mounted thereon. The mounting table 103 is provided on the side surface of the second housing 102 on the medium supply side so as to be movable in a substantially vertical direction (height direction) A1. The discharge table 104 is a tray that is formed on the first housing 101 so as to be able to hold the discharged medium and stacks the discharged medium.

The operation device 105 has an input device such as a button and an interface circuit for acquiring signals from the input device, receives an input operation by a user, and outputs an operation signal according to the input operation by the user. The display device 106 has a display including liquid crystal, organic EL (Electro-Luminescence), etc. and an interface circuit for outputting image data to the display, and displays the image data on the display.

In FIG. 1, arrow A2 indicates the medium transport direction, and arrow A3 indicates the width direction perpendicular to the medium transport direction. Hereinafter, "upstream" means upstream in the medium transport direction A2, and "downstream" means downstream in the medium transport direction A2.

FIG. 2 is a diagram for explaining the transport path inside the medium transport device 100. As shown in FIG.

The transport path inside the medium transport device 100 includes a first medium sensor 111, a contact sensor 112, a first optical sensor 113, a second optical sensor 114, a pick roller 115, a feed roller 116, a brake roller 117, and a second medium sensor 118. , first to eighth conveying rollers 119a to 119h, first to eighth driven rollers 120a to 120h, a first imaging device 121a, a second imaging device 121b, and the like.

The number of each of the pick roller 115, the feed roller 116, the brake roller 117, the first to eighth transport rollers 119a-h and/or the first to eighth driven rollers 120a-h is not limited to one. It can be multiple. In that case, the plurality of feeding rollers 116, brake rollers 117, first to eighth conveying rollers 119a-h and/or first to eighth driven rollers 120a-h are arranged side by side at intervals in the width direction A3. be done. Below, the 1st imaging device 121a and the 2nd imaging device 121b may be collectively called the imaging device 121. FIG.

The surface of the first housing 101 facing the second housing 102 forms a first guide 101a of the medium transport path, and the surface of the second housing 102 facing the first housing 101 transports the medium. Form a second guide 102a of the path.

The first medium sensor 111 is arranged on the mounting table 103 , that is, on the upstream side of the feeding roller 116 and the brake roller 117 , and detects the mounting state of the medium on the mounting table 103 . The first medium sensor 111 determines whether or not the medium is placed on the placing table 103 by a contact detection sensor that causes a predetermined current to flow when the medium is in contact or not in contact. do. The first medium sensor 111 generates and outputs a first medium signal whose signal value changes depending on whether or not the medium is mounted on the mounting table 103 . Note that the first medium sensor 111 is not limited to a contact detection sensor, and any other sensor capable of detecting the presence or absence of a medium, such as a light detection sensor, may be used as the first medium sensor 111 .

The pick roller 115 is arranged at the upstream end of the first housing 101 and comes into contact with the medium mounted on the mounting table 103 raised to substantially the same height as the medium transport path to move the medium to the downstream side. to feed. The feeding roller 116 is provided downstream of the pick roller 115 in the first housing 101, and feeds the medium placed on the mounting table 103 and fed by the pick roller 115 further downstream. do. The brake roller 117 is arranged inside the second housing 102 so as to face the feed roller 116 . The feeding roller 116 and the brake roller 117 separate the media by a so-called take-up method, in which the media placed on the mounting table 103 are fed from the upper side, and the media are separated and fed one by one. do. The pick roller 115 and the feed roller 116 are examples of rollers that feed the medium. The feed roller 116 and the brake roller 117 are an example of a separation unit that separates media.

The second medium sensor 118 is arranged downstream of the feeding roller 116 and the brake roller 117 and upstream of the first conveying roller 119a and the first driven roller 120a in the medium conveying direction A2. The second medium sensor 118 includes a light emitter and a light receiver provided on one side of the medium transport path, and a mirror or the like provided at a position facing the light emitter and the light receiver across the medium transport path. and a member. The light emitter is an LED (Light Emitting Diode) or the like, and emits light toward the medium transport path. On the other hand, the light receiver receives light emitted by the light emitter and reflected by the reflecting member, and generates and outputs a second medium signal, which is an electrical signal corresponding to the intensity of the received light.

When a medium exists at the position of the second medium sensor 118, the light emitted by the light emitter is blocked by the medium. Therefore, the signal value of the second medium signal changes depending on whether the medium exists at the position of the second medium sensor 118 or not. Thereby, the second medium sensor 118 detects whether or not a medium exists at that position, and detects the fed medium. The light emitter and light receiver of the second medium sensor 118 may be provided at positions facing each other across the transport path, and the reflecting member may be omitted. Also, the second medium sensor 118 may detect the presence of the medium by a contact detection sensor or the like that causes a predetermined current to flow when the medium is in contact or when the medium is not in contact.

The first to eighth conveying rollers 119a to 119h and the first to eighth driven rollers 120a to 120h are provided downstream of the feed roller 116 and the brake roller 117, and fed by the feed roller 116 and the brake roller 117. The medium is transported downstream.

The first imaging device 121a has a linear optical system type CIS (Contact Image Sensor) line sensor having CMOS (Complementary Metal Oxide Semiconductor) imaging elements linearly arranged in the main scanning direction. The first imaging device 121a also has a lens that forms an image on the imaging device, and an A/D converter that amplifies an electrical signal output from the imaging device and performs analog/digital (A/D) conversion. The first imaging device 121a captures an image of the surface of the medium being conveyed to generate and output an input image.

Similarly, the second imaging device 121b has a linear optical system type CIS line sensor having CMOS imaging elements linearly arranged in the main scanning direction. The second imaging device 121b also has a lens that forms an image on the imaging device, and an A/D converter that amplifies and A/D-converts the electrical signal output from the imaging device. The second imaging device 121b captures an image of the back surface of the medium being conveyed to generate and output an input image.

The medium conveying device 100 may have only one of the first image pickup device 121a and the second image pickup device 121b to read only one side of the medium. Also, instead of the line sensor of the same-magnification optical system type CIS having the CMOS imaging element, a line sensor of the same-magnification optical system type CIS having a CCD (Charge Coupled Device) imaging element may be used. Also, a reduction optics type line sensor having a CMOS or CCD imaging device may be used.

As the pick roller 115 and the feed roller 116 rotate in the medium feeding directions A11 and A12, respectively, the medium placed on the mounting table 103 moves between the first guide 101a and the second guide 102a in the medium feeding direction A2. transported towards. On the other hand, when a plurality of media are placed on the mounting table 103 by rotating the brake roller 117 in the opposite direction A13 to the medium feeding direction, the feeding roller among the media mounted on the mounting table 103 Only media in contact with 116 are separated.

While being guided by the first guide 101a and the second guide 102a, the medium is fed to the imaging position of the imaging device 121 by rotating the first and second transport rollers 119a and 119b in the directions of arrows A14 and A15. An image is captured by the imaging device 121 . Furthermore, the medium is ejected onto the ejection table 104 by rotating the third to eighth transport rollers 119c to 119h in the directions of arrows A16 to A21, respectively.

3 and 4 are schematic diagrams for explaining the contact sensor 112, the first optical sensor 113, the second optical sensor 114, and the like. FIG. 3 is a schematic diagram of the contact sensor 112, the first optical sensor 113, the second optical sensor 114, and the like as viewed from the side of the medium conveying device 100. FIG. FIG. 4 is a schematic diagram of the contact sensor 112, the first optical sensor 113, the second optical sensor 114, and the like as viewed from the mounting table 103 side.

As shown in FIGS. 3 and 4, the contact sensor 112 is arranged above the front wall 101b of the first housing 101 and the pick roller 115 in the height direction A1. The contact sensor 112 is arranged at the upstream end of the first housing 101 in the medium transport direction A2, that is, upstream from the pick roller 115 and the feed roller 116 . The contact sensor 112 is arranged substantially in the center of the medium transport path, that is, substantially in the center between the two side walls W1 and W2 of the medium transport device 100 in the width direction A3.

The contact sensor 112 has two contact members 112a and two detection members 112b. The contact members 112a are arranged at the upstream end of the first housing 101 in the medium transport direction A2 and spaced apart in the width direction A3. Each contact member 112a is a switch, and is provided movably in the medium transport direction A2. Each detection member 112b is arranged on the rear surface of each contact member 112a so as to face each contact member 112a. Each sensing member 112b is an actuator. When each detection member 112b is in contact with each contact member 112a or when it is not in contact with each contact member 112a, each detection member 112b is detected by a contact detection sensor that causes a predetermined current to flow. A determination is made as to whether or not it is in contact with the member 112a. The contact sensor 112 generates a contact signal whose signal value changes between a state in which any contact member 112a is in contact with the detection member 112b and a state in which no contact member 112a is in contact with the detection member 112b. and output.

FIG. 5 is a schematic diagram for explaining the operation of the contact sensor 112 when the rear end (upstream end) of the medium to be fed is lifted.

FIG. 5 shows a state in which a plurality of media M1 and M2, which are stapled at the central portion of the rear end side, are fed. When the media M1 and M2 are fed, the middle portion of the trailing end side of which is bound by the staple S1, the uppermost medium M1 is fed by the feed roller 116 while the other medium M2 is loaded by the brake roller 117. It stays on the stand 103 . Therefore, the portion bound by the staple S1 is pulled by the uppermost medium M1, floats upward, and contacts the front surface of the contact member 112a.

As shown in FIG. 3, in the initial state, the contact member 112a is separated from the detection member 112b. On the other hand, as shown in FIG. 5, when the rear end of the medium M1 being fed is lifted and contacts the front surface of the contact member 112a, the rear end of the medium M1 pushes the contact member 112a, causing the contact member 112a to move. contacts the detection member 112b. That is, the contact signal output by the contact sensor 112 changes according to the contact between the contact sensor 112 and the medium. The contact sensor 112 can detect a medium whose trailing end side is stapled.

On the other hand, as shown in FIGS. 3 and 4, the first optical sensor 113 and the second optical sensor 114 are arranged above the lower surface of the pick roller 115 in the height direction A1. The first optical sensor 113 and the second optical sensor 114 are arranged so that at least a portion thereof overlaps the pick roller 115 in the medium conveying direction A2, that is, at least a portion overlaps the pick roller 115 when viewed in the width direction A3. be. When a medium whose trailing edge is folded or curled is fed, the folded or curled portion is located upstream of the pick roller 115 (the first optical sensor 113 and the second optical sensor 114). It is fed flattened by the front wall 101b located on the side. Therefore, the first optical sensor 113 and the second optical sensor 114 can suppress erroneous detection of floating of the medium when a folded or curled medium is fed. Note that the first optical sensor 113 and the second optical sensor 114 may be arranged upstream or downstream of the pick roller 115 . In addition, the first optical sensor 113 and the second optical sensor 114 are spaced apart substantially in the center of the medium transport path, that is, substantially in the center between the two side walls W1 and W2 of the medium transport device 100 in the width direction A3. Arranged side by side with space.

The first optical sensor 113 is an infrared proximity distance sensor, and measures the distance to an object present in the opposite position from the time difference between irradiation and reflection of infrared rays. The first photosensor 113 includes a first light emitter 113a and a first light receiver 113b. The first light emitter 113a is an example of a light emitter, and the first light receiver 113b is an example of a light receiver. The first light emitter 113a and the first light receiver 113b are arranged outside the pick roller 115 and the feed roller 116 in the width direction A3 orthogonal to the medium conveying direction, on the opposite side of the pick roller 115 and the feed roller 116, that is, on the side wall. It is arranged so as to face the W1 side (outside). The first light emitter 113a emits light (infrared rays) toward the side opposite to the pick roller 115 and the feeding roller 116, that is, toward the side wall W1 (outside). On the other hand, the first light receiver 113b receives light emitted from the first light emitter 113a and reflected by the medium being fed, and generates a first light receiving signal, which is an electrical signal corresponding to the received light. Output.

The signal value of the first light receiving signal increases as the time from the irradiation of light by the first light emitter 113a to the reception of light by the first light receiver 113b decreases, and the signal value decreases as the time increases. generated to be For example, the first light receiving signal may be generated such that the signal value increases as the intensity of the light received by the first light receiver 113b increases, and the signal value decreases as the intensity decreases. In that case, the sidewall W1 may have a color other than white (eg, gray or black) to absorb the light emitted from the first light emitter 113a.

The second optical sensor 114 is an infrared proximity distance sensor, and measures the distance to an object present in the opposite position from the time difference between irradiation and reflection of infrared rays. The second photosensor 114 includes a second light emitter 114a and a second light receiver 114b. The second light emitter 114a is an example of a second light emitter, and the second light receiver 114b is an example of a second light receiver. The second light emitter 114a and the second light receiver 114b are arranged on the opposite side of the first optical sensor 113 with the pick roller 115 and the feed roller 116 interposed in the width direction A3 perpendicular to the medium transport direction. That is, the second light emitter 114a and the second light receiver 114b are positioned outside the pick roller 115 and the feed roller 116, on the opposite side of the pick roller 115 and the feed roller 116, in the width direction A3 orthogonal to the medium conveying direction. That is, it is arranged so as to face the side wall W2 (outside). The second light emitter 114a emits light (infrared rays) toward the side opposite to the pick roller 115 and the feed roller 116, that is, toward the side wall W2 (outside). On the other hand, the second light receiver 114b receives the light emitted from the second light emitter 114a and reflected by the medium being fed, and generates a second light receiving signal, which is an electrical signal corresponding to the received light. Output.

For example, the signal value of the second light receiving signal increases as the time from the irradiation of light by the second light emitter 114a to the time when the light is received by the second light receiver 114b decreases, and the signal value decreases as the time increases. generated to be The second received light signal may be generated, for example, such that the signal value increases as the intensity of the light received by the second light receiver 114b increases, and the signal value decreases as the intensity decreases. In that case, sidewall W2 may have a color other than white (eg, gray or black) to absorb light emitted from second light emitter 114a.

FIG. 6 is a schematic diagram for explaining the operation of the first optical sensor 113 when the side edge of the medium being fed is lifted.

FIG. 6 shows a state in which a plurality of media M3 and M4 are fed, the corners of which are stapled by the staple S2 on the leading end side (downstream side). When the media M3 and M4 whose leading end corners are bound by the staple S2 are fed, while the uppermost medium M3 is fed by the feed roller 116, the other medium M4 is moved to the mounting table by the brake roller 117. Try to stay at 103. Therefore, the peripheral portion of the medium M3 bound by the medium staple S2 rises to a position facing the first light emitter 113a and the first light receiver 113b.

As shown in FIG. 4, when there is no medium at a position facing the first light emitter 113a and the first light receiver 113b, the light emitted from the first light emitter 113a is reflected by the side wall W1 to form the first light receiver. The light is received by the device 113b or absorbed by the side wall W1. On the other hand, as shown in FIG. 6, when the side of the medium M3 floats, the light emitted from the first light emitter 113a is reflected by the side of the medium M3 that has floated and is received by the first light receiver 113b. be. Similarly, when a plurality of media whose trailing corners or central side portions are stapled are fed, the peripheral portion of the stapled position of the uppermost medium floats up. That is, the first light receiving signal output by the first optical sensor 113 is emitted from the first light emitter 113a toward the opposite side of the pick roller 115 and the feeding roller 116, is reflected by the medium being fed, and becomes the first light receiving signal. It changes according to the light received by the light receiver 113b. The first optical sensor 113 can detect media whose sides are stapled.

Similarly, when there is no medium at a position facing the second light emitter 114a and the second light receiver 114b, the light emitted from the second light emitter 114a is reflected by the side wall W2 and received by the second light receiver 114b. or absorbed by the sidewall W2. On the other hand, when the side of the medium floats, the light emitted from the second light emitter 114a is reflected by the side of the floated medium and received by the second light receiver 114b. That is, the second light receiving signal output by the second optical sensor 114 is emitted from the second light emitter 114a toward the opposite side of the pick roller 115 and the feeding roller 116, is reflected by the medium being fed, and receives the second light signal. It changes according to the light received by the light receiver 114b. The second optical sensor 114 is capable of detecting side-stapled media.

Note that the medium transport device 100 may have only one of the first optical sensor 113 and the second optical sensor 114 and not have the other.

FIG. 7 is a block diagram showing a schematic configuration of the medium conveying device 100. As shown in FIG.

The medium transport device 100 further includes a motor 131, an interface device 132, a storage device 140, a processing circuit 150, and the like, in addition to the configuration described above.

The motor 131 includes one or more motors, and rotates the pick roller 115, the feed roller 116, the brake roller 117, and the first to eighth transport rollers 119a to 119h according to a control signal from the processing circuit 150. are fed and transported. Note that the first to eighth driven rollers 120a to 120h may be provided so as to be rotated by the driving force from the motor 131 instead of being driven by the rotation of the first to eighth conveying rollers 119a to 119h. Also, the motor 131 moves the mounting table 103 according to a control signal from the processing circuit 150 .

The interface device 132 has an interface circuit conforming to a serial bus such as USB, for example, and is electrically connected to an information processing device (not shown) (for example, a personal computer, a mobile information terminal, etc.) to receive read images and various information. Send and receive. Also, instead of the interface device 132, a communication unit having an antenna for transmitting and receiving wireless signals and a wireless communication interface circuit for transmitting and receiving signals through a wireless communication line according to a predetermined communication protocol may be used. The predetermined communication protocol is, for example, a wireless LAN (Local Area Network).

Storage device 140 is an example of a storage unit. The storage device 140 includes memory devices such as RAM (Random Access Memory) and ROM (Read Only Memory), fixed disk devices such as hard disks, or portable storage devices such as flexible disks and optical disks. The storage device 140 also stores computer programs, databases, tables, and the like used for various processes of the medium transport device 100 . The computer program may be installed in the storage device 140 from a computer-readable portable recording medium using a known setup program or the like. Examples of portable recording media include CD-ROMs (compact disc read only memory) and DVD-ROMs (digital versatile disc read only memory).

The storage device 140 also stores a first flag and a second flag as data. The first flag indicates whether the processing circuit 150 has determined that the medium has lifted based on the first light receiving signal output by the first photosensor 113 and the second light receiving signal output by the second photosensor 114. This is a flag indicating whether or not The second flag is a flag indicating whether or not the processing circuit 150 has determined that the medium has risen based on the contact signal output by the contact sensor 112 .

The processing circuit 150 operates based on a program stored in advance in the storage device 140 . The processing circuit 150 is, for example, a CPU (Central Processing Unit). As the processing circuit 150, a DSP (digital signal processor), LSI (large scale integration), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), or the like may be used.

The processing circuit 150 includes the operation device 105, the display device 106, the first medium sensor 111, the contact sensor 112, the first optical sensor 113, the second optical sensor 114, the second medium sensor 118, the imaging device 121, the motor 131, and the interface device. 132, storage device 140, etc., and controls these units. The processing circuit 150 controls the motor 131 to feed and convey the medium, controls the imaging device 121 to acquire an input image, and transmits the acquired input image to the information processing device via the interface device 132. . Further, the processing circuit 150 determines whether the floating of the medium has occurred based on the contact signal output by the contact sensor 112, the first light receiving signal output by the first optical sensor 113, and the second light receiving signal output by the second optical sensor 114. Determine whether or not

FIG. 8 is a diagram showing a schematic configuration of the storage device 140 and the processing circuit 150. As shown in FIG.

As shown in FIG. 8, the storage device 140 stores programs such as a control program 141, a first determination program 142, a second determination program 143, and the like. Each of these programs is a functional module implemented by software running on a processor. The processing circuit 150 functions as a control section 151 , a first determination section 152 and a second determination section 153 by reading each program stored in the storage device 140 and operating according to each read program.

FIG. 9 is a flowchart illustrating an example of the operation of medium reading processing.

An example of the operation of the medium reading process of the medium conveying device 100 will be described below with reference to the flowchart shown in FIG. The operation flow described below is executed mainly by the processing circuit 150 in cooperation with each element of the medium conveying device 100 based on a program stored in advance in the storage device 140 . Note that the medium transport device 100 has, as feeding modes for feeding media, a separation mode in which a plurality of media are separated and fed, and a non-separation mode in which media are fed without being separated. . The flow of operations shown in FIG. 9 is executed when the feed mode is set to the separation mode.

First, the control unit 151 receives an instruction to read a medium from the operation device 105 or the interface device 132 when a user inputs an instruction to read the medium using the operation device 105 or the information processing device. (step S101).

Next, the control unit 151 acquires the first medium signal from the first medium sensor 111, and determines whether or not the medium is placed on the placing table 103 based on the acquired first medium signal (step S102). If no medium is placed on the placement table 103 , the control unit 151 returns the process to step S<b>101 and waits until a new operation signal is received from the operation device 105 or the interface device 132 .

On the other hand, when the medium is placed on the placing table 103, the controller 151 drives the motor 131 to feed and transport the medium (step S103). The control unit 151 drives the motor for moving the mounting table 103 to move the mounting table 103 to a position where the medium can be fed. Next, the control unit 151 drives the motors for rotating each roller, rotates the pick roller 115, the feed roller 116, the brake roller 117, and the first to eighth transport rollers 119a to 119h. feeds and conveys the medium placed on the

Next, the first determination unit 152 starts the first determination process, and the second determination unit 153 starts the second determination process (step S104). After that, the first determination process and the second determination process are executed in parallel with the medium reading process. In the first determination process, the first determination unit 152 determines whether floating of the medium has occurred based on the first received light signal output from the first photosensor 113 and the second received light signal output from the second photosensor 114 . determine whether or not Details of the first determination process will be described later. On the other hand, the second determination unit 153 determines whether or not the medium has lifted based on the contact signal output from the contact sensor 112 in the second determination process. Details of the second determination process will be described later.

Next, the control unit 151 determines whether or not the first flag is set to ON, thereby determining whether or not the first determination unit 152 determines that the medium is floating. (step S105). The first flag is set to OFF while the first determination unit 152 determines that the medium has not floated in the first determination process, and is set to ON when it is determined that the medium has floated. set. When the first flag is set to OFF, the control unit 151 shifts the process to step S107.

On the other hand, when the first flag is set to ON, the control unit 151 executes abnormality processing (step S106), and ends the series of steps. The control unit 151 stops the motor 131 to stop feeding and transporting the medium as an abnormality process. The control unit 151 can prevent damage to the medium by stopping feeding and conveying the medium when the stapled medium is fed and the medium is floating. As the abnormal processing, the control unit 151 may display on the display device 106 or transmit to the information processing device via the interface device 132 to notify the user of the occurrence of the floating of the medium.

Next, the control unit 151 determines whether or not the second flag is set to ON, thereby determining whether or not the second determination unit 153 has determined that the medium is floating. (step S107). The second flag is set to OFF while the second determination unit 153 determines that the medium has not floated in the second determination process, and is set to ON when it is determined that the medium has floated. set. When the second flag is set to OFF, the control unit 151 shifts the process to step S108.

On the other hand, when the second flag is set to ON, the control unit 151 executes abnormality processing (step S106), and ends the series of steps.

In this way, the control unit 151 uses only the determination result of the determination unit that previously determined that the medium has risen, out of the first determination unit 152 and the second determination unit 153, to determine whether the other determination unit Stop feeding the media without using the result. As a result, the control unit 151 can detect at an early stage that the medium is floating, and can prevent damage to the medium caused by feeding the stapled medium.

Next, the control unit 151 determines whether or not the entire medium has passed the imaging position of the imaging device 121 (step S108). The control unit 151 periodically acquires the second medium signal from the second medium sensor 118, and the signal value of the second medium signal changes from a value indicating the presence of the medium to a value indicating the absence of the medium. Then, it is determined that the trailing edge of the medium has passed the position of the second medium sensor 118 . The control unit 151 determines that the entire medium has passed the imaging position when the first time has passed since the trailing edge of the medium passed the position of the second medium sensor 118 . The first time is set to a value obtained by adding a margin to a division value obtained by dividing the distance between the position of the second medium sensor 118 and the imaging position by the transport speed of the medium. If the entire medium has not passed the imaging position yet, the control unit 151 returns the process to step S105 and repeats the processes of steps S105 to S108.

On the other hand, when the entire medium passes through the imaging position, the first determination unit 152 and the second determination unit 153 determine that the medium has not lifted (step S109).

Next, the control unit 151 acquires an input image from the imaging device 121, and outputs the acquired input image by transmitting it to the information processing device via the interface device 132 (step S110).

Next, based on the first medium signal received from the first medium sensor 111, the control unit 151 determines whether or not the medium remains on the mounting table 103 (step S111). When the medium remains on the mounting table 103, the control unit 151 returns the process to step S104 and repeats the processes of steps S104 to S111.

On the other hand, if no medium remains on the mounting table 103, the controller 151 stops the motor 131 to stop the rotation of each roller (step S112), and ends the series of steps.

For each medium to be fed, the control unit 151 causes the pick roller 115, the feed roller 116, and the brake roller 117 to move when the leading edge of the medium passes through the nip position between the first transport roller 119a and the first driven roller 120a. You can stop it. In this case, during steps S105 to S108, the controller 151 determines whether the leading edge of the medium has passed the nip position between the first transport roller 119a and the first driven roller 120a. The control unit 151 periodically acquires the second medium signal from the second medium sensor 118, and the signal value of the second medium signal changes from a value indicating the absence of the medium to a value indicating the presence of the medium. Then, it is determined that the leading edge of the medium has passed the position of the second medium sensor 118 . The control unit 151 determines that the leading edge of the medium has passed the nip position between the first transport roller 119a and the first driven roller 120a when the second time has elapsed since the leading edge of the medium passed the position of the second medium sensor 118. judge. The second time is a value obtained by dividing the distance between the position of the second medium sensor 118 and the nip position between the first conveying roller 119a and the first driven roller 120a by the conveying speed of the medium and adding a margin to the divided value. is set to

The control unit 151 stops the motors for rotating the pick roller 115, the feed roller 116 and the brake roller 117 when the leading edge of the medium passes through the nip position between the first transport roller 119a and the first driven roller 120a. Stop media feeding. After that, the medium is conveyed by the first to eighth conveying rollers 119a to 119h. On the other hand, when the medium remains on the mounting table 103 in step S111, the control unit 151 re-drives the motors for rotating the pick roller 115, the feed roller 116, and the brake roller 117, and feeds the next medium. Let

FIG. 10 is a flow chart showing an example of the operation of the first determination process of the medium conveying device 100. As shown in FIG.

An example of the operation of the first determination process of the medium conveying device 100 will be described below with reference to the flowchart shown in FIG. The operation flow described below is executed mainly by the processing circuit 150 in cooperation with each element of the medium conveying device 100 based on a program stored in advance in the storage device 140 . The operation flow shown in FIG. 10 starts at step S104 of the medium reading process shown in FIG.

First, the first determination unit 152 sets the first flag to OFF (step S201).

Next, the first determination unit 152 acquires the first received light signal from the first photosensor 113 and acquires the second received light signal from the second photosensor 114 (step S202).

Next, the first determination unit 152 associates the acquired signal value of the first received light signal and the acquired signal value of the second received light signal with the current time and stores them in the storage device 140 (step S203).

Next, the first determination unit 152 determines whether or not the acquired signal value of the first light reception signal and the acquired signal value of the second light reception signal are equal to or greater than the light reception signal threshold (step S204). The light receiving signal threshold is determined by a preliminary experiment, and the signal value of the first light receiving signal or the second light receiving signal obtained when the side of the medium being fed is floating, and the value of the light receiving signal obtained when the side of the medium being fed is lifted. It is set to a value between the signal value of the first light receiving signal or the second light receiving signal obtained in the state where the light is not turned on. When both the signal value of the first light receiving signal and the signal value of the second light receiving signal are less than the light receiving signal threshold value, the first determination unit 152 determines that the medium is not floating at this time, and the first flag Do not change the settings of In this case, the first determination unit 152 returns the process to step S202 and repeats the processes of steps S202 to S204.

On the other hand, if at least one of the signal value of the first light reception signal and the signal value of the second light reception signal is equal to or greater than the light reception signal threshold, the first determination unit 152 determines that the light reception signal acquired this time is It is determined whether or not it is the received light signal acquired first (step S205). If the received light signal acquired this time is the first received light signal for the medium currently being fed, the first determination unit 152 ends the series of steps without executing any particular process. In this case, the first determination unit 152 determines that the portion of the medium being fed facing the first optical sensor 113 or the second optical sensor 114 is bent or curled, and the medium does not float. Determine that it has not occurred. After that, the first determination unit 152 does not determine whether or not floating of the medium has occurred for this medium.

That is, if the signal value of the first received light signal indicates that the medium is present at the position facing the first optical sensor 113 at the start of medium feeding, the first determination unit 152 determines that the medium is not fed. Regardless of the signal value of the first light receiving signal after the start, it is determined that the floating of the medium has not occurred. Further, if the signal value of the second light reception signal indicates that the medium is present at a position facing the second optical sensor 114 at the start of medium feeding, the first determination unit 152 determines that the medium is not fed. Regardless of the signal value of the second light receiving signal after the start, it is determined that the floating of the medium has not occurred. As a result, the medium conveying device 100 can detect a portion of the medium being fed that faces the first optical sensor 113 or the second optical sensor 114 and is bent or curled before being fed. It is possible to suppress erroneous determination that floating of is occurring.

On the other hand, if the received light signal acquired this time is not the first received light signal for the medium currently being fed, the first determination unit 152 determines that both the signal value of the first received light signal and the signal value of the second received light signal are It is determined whether or not it is equal to or greater than the received light signal threshold (step S206). When both the signal value of the first light receiving signal and the signal value of the second light receiving signal are equal to or greater than the light receiving signal threshold, the first determination unit 152 ends the series of steps without executing any particular process. In this case, the first determination unit 152 determines that both sides of the medium are folded or curled instead of being stapled, and that the medium is not lifted. do. After that, the first determination unit 152 does not determine whether or not floating of the medium has occurred for this medium. As a result, the medium conveying device 100 can prevent erroneous determination that the medium is floating when both sides of the medium are folded or curled.

On the other hand, if either the signal value of the first light receiving signal or the signal value of the second light receiving signal is less than the light receiving signal threshold, the first determination unit 152 determines whether the signal value of the light receiving signal becomes equal to or greater than the light receiving signal threshold. Time is calculated (step S207). The change time is the time from when the signal value of the received light signal starts to change after the start of feeding of the medium until it reaches or exceeds the received light signal threshold value. That is, the change time of the first light receiving signal is from when the signal value of the first light receiving signal starts to change after the start of feeding of the medium to when it indicates that the medium is present at the position facing the first optical sensor 113 . It's time for The change time of the second light receiving signal is the time from when the signal value of the second light receiving signal starts to change after the start of feeding of the medium to when it indicates that the medium is present at the position facing the second optical sensor 114. is. The first determination unit 152 refers to the signal value of each received light signal that has been acquired so far, stored in the storage device 140, and compares the signal value of each received light signal with the signal value of the received light signal acquired immediately before. When the difference is equal to or greater than a predetermined threshold, it is determined that the signal value of the received light signal has started to change.

Next, the first determination unit 152 determines whether or not the change time is equal to or greater than the change time threshold (step S208). The change time threshold is an example of a second threshold. As for the change time threshold, the change time when a plurality of media with leading edge side corners are stapled is fed, and the change time threshold value is determined by a preliminary experiment. is set to a value between the change time when is fed.

If the change time is less than the change time threshold, the first determination unit 152 sets the floating time threshold to the first value (step S209). On the other hand, if the change time is equal to or greater than the change time threshold, the first determination unit 152 sets the floating time threshold to a second value that is larger than the first value (step S210). The float time threshold is one example of a threshold. The rising time threshold is a threshold for comparison with the rising time, which is the time during which the signal value of each light receiving signal is equal to or greater than the light receiving signal threshold. The first value is set to a value larger than the floating time when a medium having a folded or curled area having a first predetermined length is fed, based on preliminary experiments. The second value is set to a value that is greater than the floating time when a medium having a folded or curled area having a second predetermined length longer than the first predetermined length is fed, based on preliminary experiments. .

Next, the first determination unit 152 calculates the floating time and determines whether or not the calculated floating time is equal to or greater than the floating time threshold (step S211). If the floating time is less than the floating time threshold, the first determination unit 152 determines that the medium is not floating at this time, and does not change the setting of the first flag. In this case, the first determination unit 152 returns the processing to step S202 and repeats the processing of steps S202 to S211.

On the other hand, if the floating time is equal to or greater than the floating time threshold, the first determination unit 152 determines that the medium has lifted, sets the first flag to ON (step S212), and ends the series of steps. In this case, in step S106 of FIG. 9, the control unit 151 executes abnormality processing and stops feeding the medium.

Note that the processing of steps S205 and/or S206 may be omitted. Also, the processing of steps S207 to S210 may be omitted and a fixed value may be used as the floating time threshold.

In this manner, the first determination unit 152 determines whether or not the medium has lifted based on the first light receiving signal from the first optical sensor 113 and the second light receiving signal from the second optical sensor 114. . The first determination unit 152 can detect the occurrence of floating of the medium on both sides of the medium by determining whether or not the floating of the medium has occurred based on the two light receiving signals. Note that the first determination unit 152 determines whether the medium has lifted based on only one of the first light receiving signal from the first optical sensor 113 and the second light receiving signal from the second optical sensor 114. It may be determined whether

In particular, the first determination unit 152 determines whether the medium is present when the signal value of the first received light signal is equal to or greater than the floating time threshold, which indicates that the medium is present at the position facing the first optical sensor 113 . It is determined that floating has occurred. The first determination unit 152 determines whether the signal value of the first received light signal changes according to the change time from when the medium starts to change after the start of feeding the medium to when it indicates that the medium is present at the position facing the first optical sensor 113 . to change the ascent time threshold. The first determination unit 152 makes the rising time threshold when the change time is equal to or greater than the change time threshold greater than the lift time threshold when the change time is less than the change time threshold.

Similarly, the first determination unit 152 determines that the medium is detected when the signal value of the second received light signal is equal to or greater than the floating time threshold, which indicates that the medium is present at the position facing the second photosensor 114 . It is determined that the uplift of has occurred. The first determination unit 152 determines the signal value of the second light reception signal according to the change time from when the medium starts to change after the start of feeding the medium to when it indicates that the medium is present at the position facing the second optical sensor 114 . to change the ascent time threshold. The first determination unit 152 makes the rising time threshold when the change time is equal to or greater than the change time threshold greater than the lift time threshold when the change time is less than the change time threshold.

11A, 11B, 11C, and 11D are graphs for explaining the technical significance of changing the rising time threshold according to the change time.

FIG. 11A shows a graph 1110 showing an example of the first received light signal when a plurality of media with leading end corners stapled is fed. FIG. 11B shows a graph 1120 showing an example of the first received light signal when a plurality of media whose trailing corners are stapled are fed. FIG. 11C shows a graph 1130 showing an example of the first received light signal when the first medium with the trailing corner bent is fed. FIG. 11D shows a graph 1140 showing an example of the first received light signal when the second medium with the trailing corner bent is fed. However, the length of the folded portion of the second medium in the medium transport direction A2 is longer than the length of the folded portion of the first medium, and the length of the folded portion of the second medium in the width direction A3 is longer than the length of the folded portion of the second medium. The length of the folded portion of the first medium is approximately the same. The horizontal axis of each of the graphs 1110, 1120, 1130, and 1140 indicates the time from the start of feeding the medium, and the vertical axis indicates the signal value of the first received light signal.

If the stapled medium is fed and the stapled portion passes through the separation unit, the medium may be damaged. In some cases, it is necessary to stop feeding the medium as soon as possible. On the other hand, when a medium whose sides are folded or curled is fed, the folded or curled portion passes through the separation section, and then passes through the first guide 101a and the second guide 101a. No damage to the media occurs because it is well guided by 102a. In this case, if the medium transport device 100 stops feeding the medium, the user needs to reset the medium on the mounting table 103 and feed the medium again, which impairs convenience for the user. Therefore, it is desirable that the medium feeding device 100 continue feeding the medium when the medium with the side part bent or the medium curled is fed.

By reducing the floating time threshold, the medium transport device 100 can stop feeding the medium early when the stapled medium is fed. However, if the floating time threshold is reduced, the media transport apparatus 100 may erroneously stop feeding media when media with folded sides or curls are fed. On the other hand, the medium conveying apparatus 100 suppresses erroneous stopping of medium feeding when a medium with folded sides or curled is fed by increasing the floating time threshold. can. However, if the floating time threshold is increased, the medium transport device 100 cannot stop feeding the medium early when the stapled medium is fed.

In the example shown in FIG. 11A , the medium is fed with the corners on the leading end side stapled, the side portion of the medium starts to float at time T11, and the signal value of the first light receiving signal is equal to or greater than the light receiving signal threshold at time T12. It has become. That is, the side portion of the medium suddenly rises after the start of feeding of the medium, and the change time is sufficiently short. On the other hand, in the example shown in FIG. 11B , the medium with the trailing edge side corners stapled is fed, the side portion of the medium starts to float at time T21, and the side portion of the medium begins to rise after time T21, which is sufficiently after time T11. At time T22, the signal value of the first light receiving signal is greater than or equal to the light receiving signal threshold. That is, the sides of the medium rise gently, and the change time is long.

The medium transport device 100 makes the floating time threshold value for a short change time smaller than the floating time threshold value for a large change time. As a result, the medium conveying device 100 early stops feeding the media whose corners on the leading end side are stapled (time T13 in FIG. 11A), while the corners on the trailing end side are stapled. Feeding of the medium can also be reliably stopped. The time T23 for stopping the feeding of the media whose rear corners are stapled is after the time T13 for stopping the feeding of the media whose leading corners are stapled. However, in the case of feeding the media whose corners on the trailing edge side are stapled, it takes a sufficient amount of time from the start of the feeding of the media until the stapled portion passes through the separating section. Therefore, damage to the media is unlikely to occur even if media feeding is not stopped early.

On the other hand, in the example shown in FIG. 11C , the first medium with the trailing corner bent is fed, and the tip of the bent portion reaches the position facing the first optical sensor 113 at time T31. ing. After that, the distance between the first optical sensor 113 and the bent portion gradually becomes shorter, and the signal value of the first light receiving signal becomes equal to or greater than the light receiving signal threshold at time T32. Then, at time T33, the bent portion passes the position of the first optical sensor 113, and the signal value of the first light receiving signal is less than the light receiving signal threshold. In the example shown in FIG. 11D , the second medium with the trailing corner bent is fed, and at time T41, the downstream end of the bent portion reaches the position facing the first optical sensor 113 . there is After that, the distance between the first optical sensor 113 and the bent portion gradually becomes shorter, and at time T42, the signal value of the first light receiving signal becomes equal to or greater than the light receiving signal threshold. Then, at time T43, the bent portion passes the position of the first optical sensor 113, and the signal value of the first light receiving signal is less than the light receiving signal threshold.

In the first medium, since the length of the folded portion in the medium transport direction A2 is short, the speed at which the folded portion approaches the first optical sensor 113 is high (fast). Therefore, as shown in FIG. 11C, the change time is short for the first medium, and the floating time threshold is set to a small value. However, since the floating time is sufficiently short for the first medium, it is not determined that the medium has floated. On the other hand, in the second medium, since the length of the folded portion in the medium transport direction A2 is long, the floating time is increased as shown in FIG. 11D. However, in the second medium, the speed at which the folded portion approaches the first optical sensor 113 is low (slow), so that the change time becomes longer as shown in FIG. be done. Therefore, it is not judged that the floating of the medium has occurred.

That is, by changing the floating time threshold according to the change time, the medium transport device 100 appropriately detects the floating of the stapled medium and feeds the folded or curled medium. It is possible to suppress erroneous detection that the medium is floating.

FIG. 12 is a flow chart showing an example of the operation of the second determination process of the medium conveying device 100. As shown in FIG.

An example of the operation of the second determination process of the medium conveying device 100 will be described below with reference to the flowchart shown in FIG. The operation flow described below is executed mainly by the processing circuit 150 in cooperation with each element of the medium conveying device 100 based on a program stored in advance in the storage device 140 . The operation flow shown in FIG. 12 starts at step S104 of the medium reading process shown in FIG.

First, the second determination unit 153 sets the second flag to OFF (step S301).

Next, the second determination unit 153 acquires a contact signal from the contact sensor 112 (step S302).

Next, the second determination unit 153 determines whether or not the acquired signal value of the contact signal indicates that any of the contact members 112a is in contact with the detection member 112b (step S303). When the signal value of the contact signal indicates that none of the contact members 112a are in contact with the detection member 112b, the second determination unit 153 determines that the medium is not currently floating, Do not change flag settings. In this case, the second determination unit 153 returns the process to step S302 and repeats the processes of steps S302 and S303.

On the other hand, if the signal value of the contact signal indicates that one of the contact members 112a is in contact with the detection member 112b, the second determination unit 153 determines that the medium has lifted, and sets the second flag. is set to ON (step S304), and the series of steps ends. In this case, in step S106 of FIG. 9, the control unit 151 executes abnormality processing and stops feeding the medium.

Thus, the second determination unit 153 determines whether or not the medium has floated based on the contact signal. As described above, when a medium whose rear end side is stapled is fed, the stapled portion contacts the contact sensor 112 . For this reason, the second determination unit 153 determines that the floating of the medium occurs when the medium whose trailing end side is stapled is fed. On the other hand, in a medium whose trailing edge is folded or curled, the angle formed by the folded or curled portion and other portions is usually an obtuse angle. The curled portion does not contact the contact member 112a. For this reason, the second determination unit 153 does not determine that the floating of the medium has occurred when a medium whose rear end side is folded or curled is fed. Therefore, the second determination unit 153 can appropriately distinguish between media whose trailing edge side is stapled and media whose trailing edge side is folded or curled.

As detailed above, the medium transport device 100 uses the first optical sensor 113, the second optical sensor 114, and the contact sensor 112 to independently determine whether or not the medium has floated. As a result, the medium conveying apparatus 100 uses the first optical sensor 113 or the second optical sensor 114 to quickly detect a medium whose leading end side is stapled, and uses the contact sensor 112 to detect a medium whose trailing end side is stapled. It has become possible to detect media bound by . Then, the medium transporting device 100 stops feeding the medium using only the determination result that the medium has been lifted. Therefore, the medium conveying device 100 can stop feeding the medium earlier when the medium floats.

In particular, the medium transport device 100 uses the first optical sensor 113 and the second optical sensor 114 or the contact sensor 112 to detect stapled media and folded or curled media. It became possible to distinguish with high accuracy. As a result, when a folded or curled medium is fed, the medium conveying device 100 stops the feeding by mistake, thereby saving the user from having to reset and feed the medium again. It is possible to suppress the user from being hung up, and it is possible to improve the convenience of the user.

In addition, the medium conveying device 100 can suppress the occurrence of damage to the medium by stopping the feeding of the stapled medium. In addition, the medium conveying device 100 stops feeding the stapled media, thereby preventing the staples from entering the medium conveying device 100 and damaging the glass surface of the imaging device 121 due to the staples. became possible. The user does not necessarily need to confirm whether or not the medium to be fed is stapled before feeding the medium, and the medium transport device 100 can improve user convenience. .

FIG. 13 is a diagram showing a schematic configuration of a processing circuit 250 of a medium transporting device according to another embodiment.

The processing circuit 250 is used in place of the processing circuit 150 of the medium transport device 100, and instead of the processing circuit 150, executes medium reading processing, first determination processing, second determination processing, and the like. The processing circuit 250 has a control circuit 251, a first determination circuit 252, a second determination circuit 253, and the like. Each of these units may be composed of an independent integrated circuit, microprocessor, firmware, or the like.

The control circuit 251 is an example of a control section and has the same function as the control section 151 . The control circuit 251 receives an operation signal from the operation device 105 , a first medium signal from the first medium sensor 111 and a second medium signal from the second medium sensor 118 . In addition, the control circuit 251 reads out the result of determination of the floating of the medium by the first determination circuit 252 and the second determination circuit 253 from the storage device 140 . The control circuit 251 controls the motor 131 to control each roller based on the received signals, and stops the feeding of the medium based on the read determination result. Also, the control circuit 251 acquires an input image from the imaging device 121 and outputs it to the interface device 132 .

The first determination circuit 252 is an example of a first determination section and has the same function as the first determination section 152 . The first determination circuit 252 receives the first light receiving signal from the first optical sensor 113 and the second light receiving signal from the second optical sensor 114, and determines whether or not the medium is floating based on the received signals. Then, the determination result is stored in the storage device 140 .

The second determination circuit 253 is an example of a second determination section and has the same function as the second determination section 153 . The second determination circuit 253 receives the contact signal from the contact sensor 112 , determines whether or not the medium is floating based on the received signal, and stores the determination result in the storage device 140 .

As described in detail above, even when the processing circuit 250 executes the medium reading process, the first determination process, and the second determination process, the medium transporting apparatus further increases the feeding of the medium when the medium floats. It was possible to stop early.

REFERENCE SIGNS LIST 100 medium transport device 112 contact sensor 113 first optical sensor 113a first light emitter 113b first light receiver 114 second light sensor 114a second light emitter 114b second light receiver 115 pick roller 116 feeding roller 151 control section 152 first determination section 153 second determination section

Claims (7)

a roller that feeds the medium;
A light-emitting unit and a light-receiving unit arranged outside the roller in a direction orthogonal to the medium conveying direction, the light-emitting unit emitting light toward the opposite side of the roller, reflected by the medium being fed, and the light receiving unit an optical sensor that generates a light reception signal corresponding to the light received by the unit;
a contact sensor arranged upstream of the roller in the medium conveying direction and generating a contact signal according to contact with the medium;
a first determination unit that determines whether or not floating of the medium has occurred based on the received light signal;
a second determination unit that determines whether or not floating of the medium has occurred based on the contact signal;
a control unit that stops feeding the medium using only the judgment result of the judgment unit that first judges that the medium has risen, out of the first judgment unit and the second judgment unit;
A medium transport device, comprising: The first determination unit
determining that the medium has floated when the signal value of the received light signal indicates that the medium is present at a position facing the optical sensor for a time equal to or greater than a threshold;
The threshold value is changed according to a change time from when the signal value of the light receiving signal starts to change after the start of feeding of the medium to when it indicates that the medium exists at a position facing the optical sensor. 2. The medium transport device according to 1. The medium conveyance according to claim 2, wherein the first determination unit makes the threshold when the change time is equal to or greater than a second threshold greater than the threshold when the change time is less than the second threshold. Device. If the signal value of the received light signal indicates that the medium is present at a position facing the optical sensor at the start of feeding the medium, the first determination unit detects the received light after the start of feeding the medium. 4. The medium transporting device according to claim 1, wherein it is determined that no floating of the medium has occurred regardless of the signal value of the signal. A second light-emitting unit and a second light-receiving unit are arranged on the opposite side of the optical sensor across the roller in a direction perpendicular to the medium conveying direction, and arranged outside the roller in the direction perpendicular to the medium conveying direction. , a second light for generating a second light receiving signal corresponding to the light emitted from the second light emitting portion toward the opposite side of the roller, reflected by the medium being fed, and received by the second light receiving portion; further comprising a sensor;
5. The medium conveying device according to claim 1, wherein said first determination unit determines whether or not floating of the medium has occurred, further based on said second light receiving signal. A roller that feeds a medium, and a light-emitting unit and a light-receiving unit that are arranged outside the roller in a direction perpendicular to the medium-conveying direction. a light sensor that generates a light reception signal corresponding to the light reflected by the medium and received by the light receiving unit; A control method for a media transport device comprising: a contact sensor that generates a
determining whether or not floating of the medium has occurred based on the received light signal;
determining whether or not the medium has floated based on the contact signal;
Stopping the feeding of the medium using only the determination result of the first determination that the medium has risen, out of the determination based on the light reception signal and the determination based on the contact signal;
A control method characterized by: A roller that feeds a medium, and a light-emitting unit and a light-receiving unit that are arranged outside the roller in a direction perpendicular to the medium-conveying direction. a light sensor that generates a light reception signal corresponding to the light reflected by the medium and received by the light receiving unit; A control program for a medium transport device comprising a contact sensor that generates a
determining whether or not floating of the medium has occurred based on the received light signal;
determining whether or not the medium has floated based on the contact signal;
Stopping the feeding of the medium using only the determination result of the first determination that the medium has risen, out of the determination based on the light reception signal and the determination based on the contact signal;
A control program that causes the medium transport device to execute:

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