JPH1159969A - Medium conveying device and jamming determining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable jamming determination of a medium with high accuracy and to forcibly eject the media when it is the jamming which need not stop operation of a device. SOLUTION: A traveling time during which a paper sheet state medium 10 fed out of a hopper 11 reaches a medium detection sensor 8 through a first and a second conveying paths and a passing time during which the medium 10 passes the medium detection sensor 8 are monitored, and a load torque of a conveying motor for driving the conveying paths is detected by an output of an electric current sensor in the traveling time and the passing time. And generation of jamming of the medium 10 is determined by a determining means based on the level of this load torque, the traveling time and the passing time, and when jamming occurs, the medium 10 is fed reverse by the second and a third conveying paths so as to recover it in a first stacker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium transporting apparatus for feeding a sheet-shaped medium from a hopper and transporting the same, and more particularly to a medium transporting apparatus having a function of judging a medium jam.

[0002]

2. Description of the Related Art In automated equipment used in financial institutions, paper-mediums such as banknotes and various types of bills are fed out from a hopper by a media transport device, and the fed-out media is transported to a predetermined processing section or discharge port. If a medium jam occurs during conveyance, it is necessary to remove the jammed medium from the conveyance path.

For this reason, in the conventional medium transport apparatus, when the medium is transported, the time required from the start of feeding of the medium from the hopper to the time when the medium reaches a medium detection sensor provided at a predetermined position on the transport path, and The passage time from when the medium reaches the medium detection sensor to when the medium passes is monitored, and when the arrival time and the passage time are out of the ranges of the preset reference times, it is determined that a jam has occurred. Upon judging, the operation of the apparatus was stopped, and a staff member removed the jammed medium.

[0004]

However, the above-mentioned prior art has the following problems. That is, in this type of medium transport device, if the medium does not reach the medium detection sensor provided at a predetermined position on the transport path even after a predetermined time elapses after the medium is fed from the hopper, Since transport is not possible, it is necessary to stop the operation of the apparatus and remove it by a staff member.

However, when the state of transport of the medium is examined in detail, the medium that reaches the medium detection sensor and passes therethrough may be better handled as a jam, or may not be handled as a jam. I understand. For example, when the medium is transported in a chain state, or when the medium is broken and split during the transport, the medium can be transported as it is.

[0006] In addition, a medium that reaches the medium detection sensor on the conveyance path and passes through the medium, but hinders the conveyance of the medium as it is, should be handled as a jam. However, there is a possibility that such a medium can be forcibly ejected. Therefore, it was found that it was not necessary to stop the operation of the apparatus. However, in the above-described conventional medium conveyance device, even when the medium is conveyed in a chain state, or when the medium is broken and split during conveyance, the apparatus determines that the medium is jammed. Therefore, even in the case of a jam in which the reliability of the jam determination is low and the operation of the device does not need to be stopped, there is a problem that the operation of the device is stopped, and the operation efficiency of the device is reduced. .

Accordingly, the present invention provides a medium transport apparatus and a jam which can perform a highly reliable jam determination and can forcibly eject the medium in the case of a jam in which it is not necessary to stop the operation of the apparatus. It is an object to realize a determination method.

[0008]

SUMMARY OF THE INVENTION Therefore, the present invention is directed to a method of separating and feeding out media one by one from a hopper containing a sheet-like medium, and feeding the fed-out medium by a transport path including transport means driven by a motor. In the medium conveying device for conveying, a load torque detecting unit for detecting a load torque of the motor, a medium detecting unit for detecting a medium being conveyed, a detection result of the load torque by the load torque detecting unit, and the medium detecting unit. Determining means for determining whether or not a medium jam has occurred based on a detection result when the medium has been detected; and when the determining means determines that a medium jam has occurred, the motor is stopped and the medium is stopped. The transport is stopped.

Further, the present invention is directed to a medium transporting apparatus for separating and feeding out media one by one from a hopper storing paper-like media, and transporting the fed-out media through a transport path comprising transport means driven by a motor. In the jam detection method, the load torque of the motor during medium conveyance is detected and compared with the reference level, and the medium is fed from the hopper to reach the medium detection sensor provided on the conveyance path. The arrival time and the passage time until the passed medium passes through the medium detection sensor are monitored, and the arrival time and the passage time are compared with the minimum value and the maximum value of each reference value, and the load torque is determined in advance. If the arrival time and the passage time correspond to a predetermined jam determination pattern, and it is determined that a jam has occurred in the medium. It is characterized in.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of a medium conveying apparatus according to the present invention. FIG. 1 is a block diagram of a control system showing an embodiment. In the figure, 1 is a CPU (control means) for controlling the entire apparatus, 2 is a ROM in which a program for the control performed by the CPU 1 and for judging a jam is stored, 3 is input data such as the number of conveyed sheets from outside regarding the operation of the apparatus RAM for temporarily storing
A transport motor 5 by a C servo motor and a driver for driving the transport motor 4.

Reference numeral 6 denotes a current sensor which generates a small current proportional to the large current flowing through the transport motor 4 when the transport motor 4 is driven. Reference numeral 7 denotes an AD converter for converting the current generated by the current sensor 6 from an analog value to a digital value.
The D converter 7 works together with the current sensor 6 as load torque detecting means for detecting the load torque of the transport motor 4.

Reference numeral 8 denotes a medium detection sensor as first medium detection means for detecting arrival and passage of a medium at a predetermined position on a conveyance path driven by the conveyance motor 4, and reference numeral 14 denotes a second medium detection for detecting the medium. Medium detection sensor as means, 2
Reference numeral 1 denotes a medium detection sensor as second medium detection means for detecting a medium. Reference numeral 9 denotes a judging means for judging from the output of the current sensor 6 and the output of the medium detecting sensor 8 whether or not a jam of the medium has occurred.

FIG. 2 is a side view showing the structure of the transport mechanism of the embodiment. In FIG. 2, reference numeral 10 denotes a sheet-like medium, 11 denotes a hopper, and 12 denotes a vertically movable stage provided in the hopper 11, and the medium 10 is stacked on the stage 12 in the hopper 11. It is stored. Reference numeral 13 denotes a separation roller disposed at a medium feeding position at the upper end of the hopper 1, and a medium detection sensor 14 is arranged to detect the medium 10 fed from the hopper 1 by the separation roller 13.

Reference numeral 15 denotes a first stacker provided below the hopper 13 as a jam medium storage unit, 16 denotes a discharge port provided at the front of the apparatus, and 17 denotes an inside of the apparatus so as to be located below the discharge port 15. Is a second stacker provided in the second stacker. Reference numeral 18 denotes a first conveyance path, 19 denotes a second conveyance path, and 20 denotes a third conveyance path. These conveyance paths 18 to 20 are provided by conveyance means such as a conveyance belt or a conveyance roller for nipping and conveying the medium. And is driven by the transport motor 4.

Here, the first transport path 18 is provided so as to extend obliquely downward from the medium feeding position at the upper end of the hopper 1.
, A second transport path 19 is provided, and the third transport path 20 is connected to the first transport path 18 and the second transport path 1.
9 to the first stacker 14.

The second transport path 19 and the third transport path 20
Are arranged linearly, and a medium detection sensor 8 is provided at a predetermined position on the second transport path 19, and
A medium detection sensor 21 is arranged at the end of the third transport path 20. Reference numerals 22 and 23 denote switching blades for switching the transport direction of the medium 10. The switching blade 22 is provided at the end of the second transport path 19, and the switching blade 23 is connected to the first transport path 19 to the third transport path. 20 connection parts.

FIG. 3 is a side view showing the operation of the transport mechanism during normal transport, and the operation when one medium 10 is fed out and transported by the above-described configuration with reference to FIG. 1 according to FIG. 3 will be described. I do. In addition, the following operation is R
CP based on the control program stored in OM2
U1 and the separation roller 1
The rotation of 3 and the vertical movement of the stage are performed by a separation roller motor and a stage motor (not shown).

First, a driver (not shown) switches the switching blade 22 toward the discharge port 16 and switches the switching blade 23 between the first transport path 18 and the second transport path 19.
Switch to connect. Subsequently, as preparation for separating the medium 10, the separation roller 13 is rotated in the reverse direction, and at this time, the rotation of the separation roller 13 is monitored by a separation roller position sensor (not shown), and the rubber or the like provided on the separation roller 13. When the high-friction member is moved to a position facing the medium 10, that is, a separation position, the separation roller 13
Stop the rotation of.

Next, the first transport path 18 to the third transport path 20 are rotated forward by the transport motor 4 and the stage 12 is raised.
The stage 12 is stopped when a stage position sensor (not shown) detects that 0 is in contact with the separation roller 13. Next, the separation roller 13 is rotated forward, whereby the uppermost medium 10 on the stage 12 is separated from the other mediums 10 and only one sheet is fed from the hopper 11 to the first transport path 18. The medium detection sensor 14 detects the fed medium 10.

At this time, the output of the medium detection sensor 14 becomes "medium present" when the leading end of the medium 10 is detected, and changes to "no medium" when the rear end of the medium 10 passes. After the change of “14” to “no medium”, the rotation of the separation roller 13 is stopped. Further, the stage 12 is lowered after feeding out one medium 10, and the lowering is detected by a stage positic sensor, and the stage 12 is stopped.

At the same time as the rotation of the separation roller 13 is stopped as described above, the current sensor 6 detects the current flowing through the transport motor 4 and starts monitoring the current.
The medium 10 fed out as described above is the medium detection sensor 8
The arrival time is monitored until the arrival at the, which will be described later in detail. When the current flowing through the transport motor 4 is normal, the medium 10 is sent from the first transport path 18 to the second transport path 19 by the switching blade 23, and the second
When the medium reaches the medium detection sensor 8 provided in the transport path 19 of FIG. 1, the passage time of the medium 10 in the medium detection sensor 8 is monitored. This will also be described later.

When the medium 10 has passed the medium detection sensor 8 normally in time, the medium 10 is transferred to the second transport path 1 as it is.
9 and is discharged by the discharge port 16 under the guidance of the switching blade 22. The above is a series of normal operations of feeding and transporting the medium 10. FIG. 4 is a time chart showing the behavior of each part and the change of the sensor output in the normal transport operation described above.

As shown in this figure, in the medium transport apparatus according to the present embodiment, after the medium 10 is fed out from the hopper 11, the rotation of the separation roller 13 is stopped, and at the same time,
The current sensor 6 detects the current flowing in the transport motor 4 to start monitoring the current, and also monitors the arrival time until the medium 10 fed out reaches the medium detection sensor 8 as described above.

In this current monitoring, the input (Din) from the AD converter 7 is read at regular time intervals and compared with a predetermined current reference value, whereby the load torque of the transport motor 4 is grasped. As shown in the figure, the current reference value is set to five levels of the current sensor output of levels 0 to 4,
Here, level “0” indicates the non-driving state of the transport motor 4 (transfer path stopped state), and level “1” indicates the first to third transport paths 18.
The state where the transport motor 4 is driven in a state where the medium 10 is not present in the mediums 20 to 20 (idling state).
When the transport motor 4 is driven while the medium 10 is present in the third transport paths 18 to 20 (medium transport state), the level “3” indicates that the medium 10 is transported from the hopper 11 to the first transport path. The state when the sheet is fed into the path 18 (medium rush state), the level “4” is a state immediately after driving the conveyance motor 4 (the state where the conveyance path is started), and when Din exceeds the level 3 during current monitoring. Are the first to third transport paths 18 to 20
Is a condition that an abnormality such as a jam of the medium 10 has occurred.

The arrival time monitoring is the time from when the medium 10 fed out of the hopper 11 passes through the medium detection sensor 11 to when the medium 10 reaches the medium detection sensor 11 provided in the second conveyance path 8 ( Toff) is measured at regular time intervals, and the arrival time is set to a minimum value (To) of a predetermined arrival time reference value.
ffmin) and the maximum value of the arrival time reference value (Toffm)
ax), the result of the comparison is “Toff <T
offmin ”, the first transport path 1
8 or that the residual medium remaining in the second transport path 19 has reached the medium detection sensor 11.
In the case of “off> Toffmax”, it means that the medium 10 fed from the hopper 11 is loose or jammed.

When the medium 10 fed from the hopper 11 reaches the medium detection sensor 11, the process shifts from arrival time monitoring to passing time monitoring. This passage time monitoring is performed by measuring a time (Ton) at regular intervals from the time when the front end of the medium 10 reaches the medium detection sensor 8 to the time when the rear end passes, and determines the minimum value (Tonmi) of the predetermined passage time reference value.
n) and the maximum value of the transit time reference value (Tonmax), the result of the comparison is “Ton <Tonmin”.
In the case of (1), the shape abnormality occurs when the medium 10 is torn and divided during the conveyance, for example, "Ton <To
In the case of “nmax”, it means that the above-described chain of the media 10 or the medium 10 is jammed.

The judging means 9 starts monitoring the current and the arrival time, and after the arrival time, monitors the passage time to judge whether or not a jam has occurred while the medium 10 is being conveyed. In this determination, the determination unit 9 holds a table of a jam determination logic matrix shown in Table 1 below, and determines whether or not a jam has occurred based on the jam determination logic matrix.

[0028]

[Table 1] In the jam determination logic matrix of Table 1, (a) is “Din> level 3”, and (b) is “Toff <Toff”.
min ”, (c) is“ Toff> Toffmax ”,
(d) is “Ton <Tonmin”, (e) is “Ton>
Tonmax ”.

The jam determination logic matrix is, for example, 32
Has the following patterns, and the occurrence of jam is Din
Exceeds level 3, that is, “Din> level 3” is “true”. Then, as shown in patterns 18 and 19, “Toff <Toff
min ”and“ Toff> Toffmax ”are both“ false ”, and“ Ton <Tonmin ”and“ Ton>
If any one of> Tonmax is “true” and the other is “false,” the determination unit 9 determines that a jam has occurred.

As shown in the patterns 21 to 23, “Toff <Toffmin” is “false” and “Toffmin”.
f> Toffmax ”is“ true ”and“ Ton <T
"onmin" and "Ton>Tonmax" are both "false" or "Ton <Tonmin" and "Ton>
Tonmax ”is either“ true ”and the other is“ false ”
Also in the case of, the determination means 9 determines that a jam has occurred.

Further, as shown in patterns 25 to 27, "Toff <Toffmin" is "true", "Toffmin"
f> Toffmax ”is“ false ”and“ Ton <T
"onmin" and "Ton>Tonmax" are both "false" or "Ton <Tonmin" and "Ton>
Tonmax ”is either“ true ”and the other is“ false ”
Also in the case of, the determination means 9 determines that a jam has occurred.

As shown in pattern 1, “Din> level 3”, “Toff <Toffmin”, “Toff>
f> Toffmax "," Ton <Tonmin ",
If both “Ton> Tonmax” are “false”, it is determined that the data is normal, and as shown in the pattern 17, “Din
> Level 3 ”is“ true ”and“ Toff <Toffm
in ","Toff> Toffmax "," Ton <
If both “Tonmin” and “Ton> Tonmax” are “false”, the determination unit 9 determines that the device is abnormal due to a failure of the current sensor 6, the medium detection sensor 8, and the like.

The other patterns are determined to be medium abnormalities other than jams or logical abnormalities. The medium abnormalities are abnormalities in the shape of the medium 10 due to tears or chains, and the logical abnormalities are failures of the CPU 1, the AD converter 7, and the like. This is an abnormality considered to be impossible logically. Next, a description will be given of an example of the determination of a medium jam during the transport of the medium and the operation of discharging the jammed medium.

FIG. 5 is a side view showing the operation of the transport mechanism when the jammed medium is discharged, and FIG. 6 is a time chart showing the behavior of each part and the change in the sensor output when a medium jam occurs. First, the medium 10 is fed out of the hopper 11 by the separation roller 13 in the same procedure as that described with reference to FIG. 4, and at the same time when the rotation of the separation roller 13 is stopped, the judging means 9 starts current monitoring and arrival time monitoring. After the monitoring, monitor the transit time. Therefore, as shown in FIG. 6, for example, the conveyance is normally performed until the arrival time is monitored, and in the transit time monitoring, “Din> Level 3” is “true” and “Ton <Tonmin” is “false”. , "Ton> Ton
If “max” is “true”, this state corresponds to the pattern 18 in Table 1, and the determination means 9
Is determined, the rotation of the transport motor 4 is immediately stopped, and the first to third transport paths 18 to 20 are stopped.

Subsequently, a driver (not shown) switches the switching blade 23 so as to connect the second transport path 19 and the third transport path 20 as shown in FIG. 5, and then rotates the transport motor 4 in the reverse direction. And the first and third transport paths 18 and 2
Driving is performed so that the transport direction of 0 is reversed. As a result, the jammed medium 10 is transported from the second transport path 19 to the third transport path 20 and sent to the first stacker 14 to be collected.

At this time, the medium 10 is detected by the medium detection sensor 21 to confirm the feeding. In this rejection process, it is also possible to perform current monitoring and time monitoring using the medium sensors 8 and 21. FIG. 7 is a time chart showing the behavior of each part and the output change of the sensor when the jammed medium is discharged.

In this case, immediately after the transport motor 4 is rotated in the reverse direction and the transport direction of the first to third transport paths 18 to 20 is reversed, the current monitoring of the transport motor 4 is performed. After that, the passage time is monitored by the medium detection sensor 8. Here, when the output of the medium detection sensor 8 changes from “with medium” to “without medium” within a predetermined period of time, the process shifts to monitoring the arrival time of the time until the medium reaches the medium detection sensor 21. .

When the output of the medium detecting sensor 21 changes from "no medium" to "medium present" within a predetermined time, the process shifts to the passage time monitoring. When the medium changes from "with medium" to "without medium" within a predetermined time, the CPU 1 determines that the jammed medium 10 has been collected in the first stacker 14, terminates the current monitoring, and 4 is stopped, the first to third conveyance paths 18 to 20 are stopped, and the current monitoring is also ended.

In other words, in the current monitoring and the time monitoring, the judging means 9 determines that there is no abnormality in the current flowing through the transport motor 4, the passage time of the medium 10 at the medium detection sensor 8, If it is determined that there is no abnormality in the arrival time or the passage time of the medium 10, the processing is terminated assuming that the jammed medium 10 has been collected in the first stacker 14, and then the medium 10 is fed out and discharged from the hopper 11. The transfer and discharge to the outlet 16 are performed.

On the other hand, when the judging means 9 judges that Din is equal to or higher than the level 3 based on the output of the AD converter 7, or when it judges that the passing time of the medium 10 is abnormal based on the detection result of the medium detecting sensor 8, If it is determined from the detection result of the medium detection sensor medium 21 that the arrival time or the passage time of the medium 10 is abnormal, the CPU 1 immediately stops the rotation of the conveyance motor 4 and stops the first to third conveyance paths 18 to 20. Stop.

Then, a notifying unit such as a monitor or an alarm (not shown) instructs the attendant to remove the medium 10. In the case where a transport abnormality of the medium 10 other than the jam, a device abnormality, or a logical abnormality has occurred, that is, the determining unit 9 has determined that the patterns 2 to 17, the pattern 20, the pattern 24, and the patterns 28 to 32 in Table 1 are abnormal. In this case, the medium 10 is collected in the second stacker 17 without being discharged to the discharge port 16 in the operation of FIG.

That is, when the judging means 9 judges that the medium 10 has passed the medium detecting sensor 8 and determines that there is an abnormality other than a jam, the driver (not shown) switches the switching blade 2.
2 from the state in which the medium 10 is guided in the direction of the outlet 16,
Switch to a state of guiding in the direction of the second stacker 17,
As a result, the medium 10 being transported by the second transport path 19
Is sent to the second stacker 17 by the switching blade 22 and collected.

Thereafter, in the case of a medium abnormality, the medium 10 is fed out from the hopper 11, conveyed to the discharge port 16, and discharged. In the case of a device error or a logical error, the operation of the device is stopped, and a person in charge is notified to perform maintenance and inspection. If the medium 10 unreeled from the hopper 11 does not reach the medium detection sensor 11 within a predetermined time after passing through the medium detection sensor 11, it is determined that the jam cannot be conveyed as in the related art, and the operation of the apparatus is started. It is to be stopped and notified to the attendant to remove the jammed medium 10.

In each of the above-described embodiments, the apparatus for feeding the sheet-shaped medium 10 from the hopper 11 and conveying the medium to the discharge port 16 has been described. However, the present invention is not limited to this. The present invention can also be applied to a device for transporting to a processing unit such as an inspection unit or an inspection unit.

[0045]

As described above, according to the present invention, the medium is separated one by one from a hopper storing a sheet-like medium and fed out, and the fed-out medium is transported by a transport path comprising transport means driven by a motor. In the medium conveying device for conveying, a load torque detecting unit for detecting a load torque of the motor, a medium detecting unit for detecting a medium being conveyed, a detection result of the load torque by the load torque detecting unit, and the medium detecting unit. The system is equipped with a determination unit that determines whether or not a medium jam has occurred based on the detection result when the medium is detected, so it is possible to determine a highly accurate medium jam and stop the operation of the apparatus. In the case of a jam that does not need to be performed, the medium can be forcibly ejected, so that the operation efficiency can be improved. Ri faster transport process of the medium, and it becomes possible to reduce the attendant expense.

Also, since the medium determined to be jammed is transported in the direction opposite to the normal transport direction and is forcibly ejected, the automatic recovery of the apparatus can be reliably performed, and the medium determined to be jammed is transported. By configuring the transport path linearly,
An effect that secondary jam can be prevented from occurring when the jammed medium is discharged is also obtained. Further, the present invention also provides a method for detecting a jam in a medium transport apparatus that separates and feeds out the media one by one from a hopper storing a sheet-shaped medium, and transports the fed-out medium through a transport path including transport means driven by a motor. In, while detecting the load torque of the motor during the conveyance of the medium and comparing with the reference level, the arrival time until the medium is fed from the hopper and reaches the medium detection sensor provided in the conveyance path, And monitoring the passage time until the notified medium passes through the medium detection sensor, comparing the arrival time and the passage time with the minimum value and the maximum value of the respective reference values, and determining that the load torque is a predetermined reference value. When it is larger and the arrival time and the passing time correspond to a predetermined jam determination pattern, it is determined that a medium jam has occurred. There is also an effect that it is possible to fine jam of judgment.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control system showing an embodiment of a medium conveyance device according to the present invention.

FIG. 2 is a side view showing a transport mechanism of the embodiment.

FIG. 3 is a side view showing the operation of the transport mechanism during normal transport.

FIG. 4 is a time chart showing the behavior of each unit and a change in the output of a sensor during a normal transport operation.

FIG. 5 is a side view illustrating the operation of the transport mechanism when the jammed medium is discharged.

FIG. 6 is a time chart showing the behavior of each unit and a change in sensor output when a medium jam occurs.

FIG. 7 is a time chart showing the behavior of each part and the output change of the sensor when the jammed medium is discharged.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU 2 ROM 4 Conveying motor 6 Current sensor 7 AD converter 8 Medium detection sensor 9 Judgment means 10 Medium 11 Hopper 13 Separation roller 14 Medium detection sensor 15 First stacker 16 Discharge port 17 Second stacker 18 First conveyance path 19 second transport path 20 third transport path 21 medium detection sensor 22, 23 switching blade

Claims (6)

[Claims] 1. A medium transport device for separating and feeding out media one by one from a hopper storing a sheet-like medium and transporting the fed-out medium through a transport path including transport means driven by a motor. Load torque detecting means for detecting a load torque, medium detecting means for detecting a medium being conveyed, and a detection result of the load torque detected by the load torque detecting means and a detection result when the medium is detected by the medium detecting means. A determination unit that determines whether or not a jam of the medium has occurred. If the determination unit determines that a jam of the medium has occurred, the motor is stopped to stop the conveyance of the medium. Transport device. 2. The method according to claim 1, wherein the determination unit determines whether or not a jam of the medium has occurred based on a detection result of the load torque by the load torque detection unit and a detection result when the medium is detected by the medium detection unit. And determining whether or not an abnormality other than a jam has occurred. 3. The apparatus according to claim 1, wherein a first path for transporting the medium fed from the hopper is provided in the transport path.
Transport path, a second transport path for continuously transporting the medium that has passed through the first transport path, and a direction different from the second transport path from the connection between the first transport path and the second transport path. And a jam medium storage portion for storing a jammed medium. When a medium jam occurs, the second medium is stored in a direction opposite to the normal medium conveyance direction. A medium conveyance device, wherein a medium jammed by driving a third conveyance path is stored in the jam medium storage unit. 4. The medium transport according to claim 3, wherein the second transport path and the third transport path are linearly arranged, and a jam medium storage section is provided at an end of the third transport path. apparatus. 5. A jam detecting method for a medium transport device for separating and feeding out media one by one from a hopper storing a sheet-shaped medium and transporting the fed-out medium through a transport path including transport means driven by a motor. While detecting the load torque of the motor during the conveyance of the medium and comparing it with the reference level, the arrival time from when the medium is fed out from the hopper to when the medium reaches the medium detection sensor provided in the conveyance path, and The passing time until the notified medium passes through the medium detection sensor is monitored, and the arrival time and the passing time are compared with the minimum value and the maximum value of each reference value, and the load torque is determined from a predetermined reference value. When it is large and the arrival time and the passing time correspond to a predetermined jam determination pattern, it is determined that a medium jam has occurred. Jam determination method. 6. The method according to claim 5, wherein the load torque exceeds a predetermined reference level and the arrival time is larger than a minimum value of the predetermined reference time and smaller than a maximum value, and the passing time is predetermined. When the load torque exceeds a predetermined reference level and the arrival time is larger than the predetermined reference time minimum value and larger than the maximum value, the load torque exceeds the predetermined reference level. Further, when the transit time is larger than the minimum value of the predetermined reference time and smaller than the maximum value, or when the transit time is smaller than the minimum value of the predetermined reference time or larger than the maximum value, the load torque is When the time exceeds the predetermined reference level and the arrival time is smaller than the minimum value of the predetermined reference time and smaller than the maximum value, and the passing time is longer than the predetermined reference time. A jam characterized by determining that a medium jam has occurred when the transit time is larger than the minimum value and smaller than the maximum value, or when the transit time is smaller than the minimum value of the predetermined reference time or larger than the maximum value. Judgment method.