JPH08169607A - Medium processing device - Google Patents

Abstract

PURPOSE: To dispense with a special clamp mechanism and reduce a size by clamping the proximity part to the rear end of a medium between a conveyance roller and a pressure roller which are positioned near a charging and discharging port at the time of discharging the medium, and controlling power to a pulse motor so as to rotate the conveyance roller freely. CONSTITUTION: A medium 1 inserted from a charging/discharging port is conveyed to a processing part including a printing head 17 along a conveyance passage, and after printing, is conveyed in the opposite direction to be discharged. Conveyance rollers 5a, 5b and pressure rollers 7a, 7b are installed near the charging/discharging port 4. When a pulse motor 9 is rotated in the opposite direction for discharging paper after the completion of printing at the processing part and the rear end of the medium in the conveying direction is detected by the second sensor 20, power to a pulse motor 9 is controlled so that the conveyance roller may rotate freely with the proximity part to the rear end of the medium 1 clamped by roller pairs 5a, 7a; 5b, 7b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium processing apparatus such as a passbook entry machine or a slip printer for performing printing or the like on a medium such as a passbook or a slip.

[0002]

2. Description of the Related Art In a media processing apparatus such as a bankbook entry machine or a slip printer used in a financial institution, a plurality of conveyance rollers and respective conveyance rollers are provided along a conveyance path extending from a stage provided with a medium insertion / ejection port. A pressure roller that is in pressure contact with the roller is arranged, and the medium inserted from the insertion / ejection port is sandwiched between the conveyance roller and the pressure roller, and the medium is moved to a processing position such as a printing position by rotation of the conveyance roller driven by a motor. After carrying and carrying out processing such as printing by processing means such as a print head, the carrying roller is rotated in the reverse direction to return the medium to the insertion / ejection port.

As such a medium processing apparatus, there is one that processes various media having different lengths. In this type of medium processing apparatus, when a medium having a long length in the transport direction is ejected, The medium may fall from the stage to the outside of the device. Therefore, conventionally, a clamp mechanism that clamps the rear end of the medium with a force that does not drop the medium near the medium insertion / ejection port, or a stage that does not drop the longest medium to be processed To secure the length.

[0004]

However, the above-mentioned conventional techniques have the following problems, respectively. That is, when the clamp mechanism is provided, there is a problem that the mechanism is complicated and the cost is increased, and when a sufficiently long stage that does not drop the longest medium is secured, the device becomes large and downsized. There was a problem that it interfered with.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and therefore the present invention conveys a medium inserted from an insertion / ejection port provided at the rear end of a stage. In a medium processing apparatus that conveys a medium in the opposite direction after carrying it to a processing unit along a path, performs processing such as printing in the processing unit, and is located near the insertion and ejection port. And a conveying roller provided in the conveying path, a pressure roller pressed against the conveying roller, a motor for rotating the conveying roller, a transmission means for transmitting the rotational force of the motor to the conveying roller, and the conveying roller. A medium detection unit arranged so as to be located closer to the processing unit than a roller, a rotation amount detection unit for detecting the rotation amount of the motor, and the motor being energized when the medium is inserted. By rotating the roller, the medium is nipped by the conveying roller and the pressure roller and conveyed in the direction of the processing unit. When the medium is ejected, the motor is energized in the reverse direction to rotate the conveying roller in the reverse direction. As a result, the medium is nipped by the transport roller and the pressure roller to be transported in the direction of the insertion / ejection port, and when the rear end of the medium in the transport direction is detected by the medium detection means, the rotation is performed. Based on the detection information of the amount detecting means, the rotation of the transport roller is stopped and the transport roller is allowed to rotate freely while the portion near the rear end of the medium is sandwiched by the transport roller and the pressure roller. It is characterized by further comprising control means for controlling energization to the motor.

[0006]

According to the present invention having such a structure, when the medium is ejected, the portion near the rear end of the medium is nipped by the conveying roller and the pressure roller located near the insertion / ejection port, and
By controlling the energization of the pulse motor so that this transport roller can rotate freely, the medium will not be damaged from being pulled out or dropped from the stage onto the outside of the device without impairing the operability of pulling out. Therefore, it is not necessary to provide a special clamp mechanism, and the length of the stage can be set to the minimum necessary length in consideration of the insertability of the medium and the like, so that the apparatus can be downsized.

[0007]

An embodiment will be described below with reference to the drawings. First, referring to FIG. 3 and FIG. 4, FIG. 3 is a side view of a mechanism portion showing an embodiment of the medium processing apparatus according to the present invention, and FIG. 4 is a perspective view of the main portion of the mechanism portion. In the figure, 1 is a medium, 2 is a housing of the apparatus, a stage 3 is provided on the front side of the housing 2, and an insertion / ejection port 4 is provided at the rear end side of the stage 3.

Here, the length of the stage 2 is not specified, but in order to prevent the apparatus from becoming large, it is set to a length such that some of the mediums 1 of various lengths having short lengths are mounted. It is set. 5a to 5d are conveying rollers provided along a conveying path extending from the stage 3 to the back, and 6a to 5d.
Reference numeral 6d denotes a pressure roller provided so as to form a pair with each of the transport rollers 5a to 5d. The pressure rollers 6a to 6d are biased by springs 7a to 7d so as to be in pressure contact with the transport rollers 5a to 5d. .

Here, the roller intervals of the transport rollers 5a to 5d and the roller intervals of the pressure rollers 6a to 6d are shorter than the shortest one of the various media 1 of different lengths handled by this apparatus. Is set as
As a result, even the shortest medium 1 can be conveyed while being sandwiched between the conveying rollers 5a to 5d and the pressure rollers 6a to 6d.

Reference numeral 8a is a shaft of the carrying roller 5a, 8b is a shaft of the carrying roller 5b, and 9 is a pulse motor for rotating the carrying rollers 5a and 5b. Transmission means for transmitting the rotational force of the pulse motor 9 to the transport rollers 5a and 5b is composed of 10 to 15. Here, 10 is a drive gear provided on the rotating shaft of the pulse motor 9, 11 and 12 are idle gears supported by a frame (not shown), 13 is a driven gear provided on the shaft 8b of the transport roller 5a, and is an idle gear. Gear 1
1 meshes with the drive gear 10 and the idle gear 12,
By engaging the idle gear 12 with the driven gear 13, the rotation of the pulse motor 9 is transmitted to the shaft 8b through the gears 10 to 13, and the transport roller 5 is integrated with the shaft 8b.
b is designed to rotate.

Reference numerals 14a and 14b denote pulleys provided at one ends of the respective shafts 8a and 8b. The belt 15 is wound around the pulleys 14a and 14b. Therefore, the pulse motors transmitted to the shaft 8b as described above. 9 rotation is pulley 1
4b, the belt 15 and the pulley 14a are transmitted to the shaft 8a, and the transport roller 5a is rotated integrally with the shaft 8a.

Reference numeral 16 is a pulse motor for rotating the conveying rollers 5c and 5d, and the rotational force of the pulse motor 16 is transmitted to the conveying rollers 5c and 5d by a transmitting means having the same structure as the transmitting means. 17
Is a print head disposed in a processing unit set at a position between the transport rollers 5c and 5d so as to perform a print process on the medium 1 while moving in the width direction of the medium 1 (direction orthogonal to the transport direction), Reference numeral 18 denotes a platen arranged between the pressure rollers 6c and 6d so as to face the print head.

Reference numeral 19 is a first sensor for optically detecting the insertion and removal of the medium 1, and 20 is a second sensor as a medium detecting means for optically detecting the front end and the rear end of the medium 1. Both sensors are provided. 19 and 20 are arranged before and after a roller pair composed of a transport roller 5a and a pressure roller 6a located near the insertion / ejection port 4, and here, the second sensor 2 is provided.
0 is located closer to the processing section than the transport roller 5a.

Reference numeral 21 denotes a third sensor as a third detecting means for optically detecting the medium 1, which is arranged near the conveying roller 5c. FIG. 1 is a block diagram of a control system showing an embodiment of a medium processing apparatus according to the present invention.
Is a control unit as control means for controlling the operation of the present apparatus. The control unit 22 is provided with a pulse counter (not shown) for counting the number of pulses output by a signal generation circuit described later. And a signal generating circuit function as a detecting means for detecting the rotation amount of the pulse motor 9.

The pulse motors 9 and 16 are connected to the control unit 22 via motor drive circuits 23 and 24, respectively, and the first to third sensors 19 to 21 are also connected.
Is also connected to the control unit 22, and the control unit 22 controls the pulse motors 9 and 16 based on signals from the first to third sensors 19 to 21. A storage unit 25 is a memory that stores a control program for the apparatus and numerical values such as a reference value for detecting the length of the medium 1 described later.

FIG. 2 is a block diagram of the main part of FIG. 1, showing the pulse motor 9 and its motor drive circuit 23 in detail. As shown in this figure, the pulse motor 9
Are coils φ1 to φ4 connected to the power source for driving the motor
The coils φ1 to φ4 have a rotor (not shown) which rotates by energization of the coils, and the rotor is provided with a rotary shaft to which the drive gear 10 shown in FIG. 4 is attached.

On the other hand, the drive circuit 23 includes a signal generation circuit 26 connected to the control unit 22, a distribution circuit 27 connected to the signal generation circuit 26, a distribution circuit 27 and a coil φ.
1-.phi.4 and is provided with 1-phase to 4-phase transistors 28a-28d. Here, the operation of the pulse motor 9 will be described. When the motor drive command signal is output from the control unit 22 to the signal generation circuit 26, the signal generation circuit 26 sends continuous pulse signals to the distribution circuit 27 at appropriate intervals. Then, the distribution circuit 27 switches the pulse signal from the signal generation circuit 26 by one phase for each pulse in a constant direction to switch the transistors 28a to 28d.
Supply to.

As a result, the transistors 28a to 28d are formed.
Is turned on in the order of the transistor 28a, the transistor 28b, the transistor 28c, and the transistor 28d. Accordingly, the coil φ is sequentially supplied from the motor driving power source.
1, a current flows through the coil φ2, the coil φ3, and the coil φ4, and the magnetic force generated by this energizing current causes the rotor to rotate.

To stop the rotation of the rotor, the control unit 22
A command signal for stopping the motor is output from the distribution circuit 27, which keeps the output from the signal generation circuit 26 ON.
To turn on only one of the transistors 28a to 28d.
Set to N state. By doing so, current flows through only one of the coils φ1 to φ4 corresponding to the 1st to 4th phases, so that the magnetic force generated thereby stops the rotor and maintains the stopped state.

When the rotor is rotated in the reverse direction, the transistors 28d, 28c, 28c
The distribution circuit 27 switches the pulse signal from the signal generation circuit 26 by one phase for each pulse in the opposite direction so that the transistor 28a is turned on in the order of b and the transistor 28a.
To 28d, and the stop can be performed in the same manner as described above.

Next, the operation of the above structure will be described with reference to FIG. 5 together with FIGS. FIG. 5 is a side view of the main part showing the operation of the above-described structure, showing the vicinity of the transport roller 5a and the pressure roller 6a. When the medium 1 is placed on the stage 3 and the tip of the medium 1 is inserted into the insertion / ejection port 4, the tip of the medium 1 reaches the first sensor 19,
The first sensor 19 changes from the OFF state to the ON state.

That is, the tip of the medium 1 is the first sensor 19
Detected in. When the ON signal of the first sensor 19, that is, the detection signal is sent to the control unit 22, the control unit 22 causes the pulse motors 9, 16 via the motor drive circuits 23, 24.
Is driven to rotate in the forward direction. As a result, the pulse motors 9 and 16 rotate, and the rotational force thereof is changed to the gears 10 to 1 respectively.
3, the transmission rollers 5a to 5d are transmitted to the shafts 8a and 8b of the conveyance rollers 5a to 5d by the transmission mechanism including the pulleys 14a and 14b and the belt 15 and the like, so that the conveyance rollers 5a to 5d rotate in the forward direction.

Therefore, when the medium 1 is further inserted and the leading end reaches between the transport roller 5a and the pressure roller 6a, the medium 1 is nipped by both rollers 5a and 6a and is transported along the transport path. When the medium 1 is sandwiched between the transport roller 5b and the pressure roller 6b and further transported, and the tip of the medium 1 is detected by the third sensor 21,
The pulse counter provided in the control unit 22 starts counting the number of pulses output from the signal generation circuit 26 of the motor drive circuit 24.

When the count value of the pulse counter reaches the reference value for positioning the printing position stored in the storage unit 25, the control unit 22 causes the pulse motors 9 and 16 to operate.
Command signal to stop the rotation of the motor drive circuit 23, 2
4, the rotation of the transport rollers 5a-5d is stopped. As a result, the print start position on the medium 1 is positioned at a position facing the print head 17, and the print processing is performed by the print head 17.

When a line feed operation associated with print processing is required,
The control unit 22 drives the pulse motor 16 at any time via the motor drive circuit 24 to rotate the transport rollers 5c and 5d to feed the medium 1 in a line. When the printing process ends, the count value of the pulse counter is cleared and the control unit 2
2 drives the pulse motors 9 and 16 so as to rotate in reverse through the motor drive circuits 23 and 24.

As a result, the pulse motors 9 and 16 rotate in the reverse direction, and the rotational forces thereof are respectively the gears 10 to 13 and the pulley 14.
Since it is transmitted to the shafts 8a and 8b of the transport rollers 5a to 5d by a transmission mechanism including a, 14b and the belt 15,
The transport rollers 5a-5d rotate in opposite directions. As a result, the medium 1 is conveyed toward the insertion / ejection port 4, and the second
When the leading edge of the medium 1, that is, the trailing edge of the medium 1 when the medium 1 is conveyed in the reverse direction is detected by changing the sensor 20 from the ON state to the OFF state, the pulse counter outputs the signal from the signal generation circuit 26 of the motor drive circuit 23. The counting of the number of pulses is started.

When the count value of the pulse counter reaches the reference value stored in the storage unit 25 for positioning the medium stop position at the time of discharging the medium, the control unit 22 stops the rotation of the pulse motors 9 and 16. Is sent to the motor drive circuits 23 and 24, whereby the rotations of the pulse motors 9 and 16 are stopped, and the transport rollers 5a to 5d.
Is also stopped.

The reference value in this case is a distance from the installation position of the second sensor 20 so that the rear end of the medium 1 is stopped at a position rearward by a distance l _{1 with} respect to the center position of the transport roller 5a. It is set to the number of pulses corresponding to l ₂ .
Therefore, the portion near the rear end of the medium 1 is nipped by the transport roller 5a and the pressure roller 6a. After stopping the rotation of the pulse motors 9 and 16 in this way, the control unit 22 controls the current to the pulse motor 9 so that the transport roller 8a can freely rotate.

That is, as explained in FIG.
In order to stop the rotation of the pulse motor 9, that is, the rotation of the rotor of the pulse motor 9, a command signal for stopping the motor is output from the control unit 22, whereby the output from the signal generating circuit 26 is kept ON, and the distribution circuit 27 outputs the signal. Transistor 2
By turning on only one of 8a to 28d, a current is passed through only one of the coils φ1 to φ4 corresponding to one to four phases, and the rotor is stopped by the magnetic force generated by this, and Although the stopped state is held, if the control unit 22 gives a command signal to the signal generating circuit 26 so that the pulse signal is not output and the distribution circuit 27 does not output the pulse signal, the transistors 28a to 28d are also provided. Is eventually turned off, and the coils φ1 to φ4 of the pulse motor 9 are not energized, so that the rotor can freely rotate, and as a result, the transport roller 8a can freely rotate.

In this state, the medium 1 is subjected to a mechanical frictional load between the transport roller 5a and the pressure roller 6a and a slight resistance due to the inertia of the pulse motor 9, whereby the medium 1 falls outside the apparatus. Since the state in which the medium 1 is sandwiched between the transport roller 5a and the pressure roller 6a is maintained without doing so, the medium 1 waits for removal in this state.

When the apparatus operator or the like pulls out the medium 1, the pulling force causes the transport roller 5a and the pressure roller 6a to easily rotate, and the medium 1 is pulled out of the nip between the rollers 5a and 6a. Then, the trailing end of the medium 1 passes through the first sensor 16 and is switched from the ON state to the OFF state, whereby the removal of the medium 1 is detected, and the process ends.

As described above, when the medium 1 is discharged, the medium 1 is not completely discharged from the final conveying roller 5a and the pressure roller 6a, and the portion near the rear end of the medium 1 is set to both rollers 5a, 6a.
By controlling the energization to the pulse motor 9 so that the conveyance roller 5a can freely rotate while being pinched by a, the medium 1 can be prevented from being damaged when the medium 1 is pulled out or the operability of pulling out is deteriorated. Is not dropped from the stage 3 to the outside of the apparatus, the length of the stage 3 can be set to the minimum required length in consideration of insertability of the medium 1 without providing a special clamp mechanism.
An effect that the device can be downsized can be obtained.

Next, another embodiment of the medium processing apparatus according to the present invention will be described. In this embodiment, when the medium 1 is inserted, the length of the medium 1 is determined, and the medium 1 having a length equal to or longer than a predetermined reference length is nipped by both rollers 5a and 6a at the time of ejection, and the length is less than the reference length. The medium 1 is completely discharged from both rollers 5a and 6a and dropped onto the stage 3. The device configuration is almost the same as that of the above-described embodiment, but when the medium 1 is ejected, it is determined whether it is pinched or ejected. The storage unit 25 stores an area serving as a storage unit that stores the reference value A and sets a flag as the length determination information of the medium 1 based on the reference value A.
The control unit 22 controls the pulse motor 9 based on this flag to pinch / release the medium 1.

It should be noted that the reference value A is a medium in which it is guaranteed that the medium 1 does not fall out of the apparatus from the stage 3 even when the medium 1 is completely discharged from both rollers 5a and 6a when the medium 1 is discharged. The length is set as the number of pulses given to the pulse motor 9. The present embodiment will be described below with reference to the drawings. FIG. 6 is a flow chart showing the operation of this embodiment, FIG. 7 is a side view of a main portion when the length of the medium 1 is determined, and the following description will be made with reference to FIG. The steps shall be performed in the order shown.

First, as in the above-described embodiment, when the medium 1 is placed on the stage 3 and the tip thereof is inserted into the insertion / ejection port 4, the tip of the medium 1 is detected by the first sensor 19, and The ON signal, that is, the detection signal of the sensor 19 of No. 1 is the control unit 2
2 is sent to the motor drive circuit 23, 2
The pulse motors 9 and 16 are driven so as to rotate in the forward direction via 4, so that the pulse motors 9 and 16 rotate, and the rotational forces thereof are respectively gears 10 to 13, pulleys 14a,
By the transmission mechanism including 14b and the belt 15 and the like, the power is transmitted to the shafts 8a and 8b of the transport rollers 5a to 5d, so that the transport rollers 5a to 5d rotate in the forward direction.

Therefore, when the medium 1 is further inserted and the leading end reaches between the conveying roller 5a and the pressure roller 6a, the medium 1 is nipped by both rollers 5a and 6a and is conveyed along the conveying path. On the other hand, when the ON signal of the first sensor 19, that is, the detection signal for detecting the medium 1 is sent to the control unit 22 as described above, the count value of the pulse counter of the control unit 22 is cleared (S1).

After that, the control unit 22 monitors whether the second sensor 20 is switched from the OFF state to the ON state (S).
2). Then, as shown in FIG. 7, the tip of the medium 1 moves to the second position.
When the position of the sensor 20 is reached and the second sensor 20 which is the detection signal thereof is sent an ON signal to the control unit 22, the pulse counter counts up, that is, "+1" is counted (S3), and thereafter, The control unit 22 compares the count value N of the pulse counter with the reference value A stored in the storage unit 25 (S4).

As described above, the reference value A may not drop out of the apparatus from the stage 3 even if the medium 1 is completely discharged from both rollers 5a and 6a when the medium 1 is ejected. The guaranteed medium length is set as the number of pulses to be applied to the pulse motor 9, and when the "count value N = reference value A" is not satisfied, the control unit 22 causes the second sensor 20 to operate.
Is switched to the OFF state or not (S
5).

If the count value N is not equal to the reference value A and the second sensor 20 is not switched to the OFF state, the count value N is equal to the reference value A, or the second sensor 20 is turned off. The processing of S3 to S5 is repeated until is switched to the OFF state. However, when it is determined in S4 that "count value N = reference value A", the control unit 22 causes a predetermined area of the storage unit 25 to be displayed. The flag "1" is set (S6), and the second sensor 2 is set in S5.
When it is determined that 0 has been switched to the OFF state, the flag "0" is set in the area of the storage unit 25 (S7).

After that, as in the case of the above-described embodiment, the medium 1 is conveyed, and the print processing by the print head 17 is performed (S
8) Further, similarly, the medium 1 is conveyed in the reverse direction,
Ejection from the insertion / ejection port 4 is performed, and at that time, the contents of a predetermined area of the storage unit 25 are judged by the control unit 22 (S
9) If the flag "1" is set in this area, the current to the pulse motor 9 is controlled so that the transport roller 6a is stopped so that it can rotate freely, as in the previous embodiment, and the medium is controlled. The portion near the rear end of 1 is the transport roller 5
It is nipped between the pressure roller 6a and the pressure roller 6a (S10), and the process is terminated after the medium 1 is extracted.

On the other hand, when it is determined in S9 that the flag "0" is set in the area of the storage unit 25, the portion near the rear end of the medium 1 is nipped by the transport roller 5a and the pressure roller 6a. Without the control, the control unit 22 controls the transport roller 5a to rotate until the medium 1 is completely discharged (S10) and falls on the stage 3, and the processing is ended after the medium 1 is extracted. .

As described above, in this embodiment, the medium 1 is pinched or ejected at the time of ejection according to the length of the medium 1, so that the same effect as that of the above-mentioned embodiment can be obtained and the stage can be obtained. 3 A short medium that does not fall out of the device from above 1
Is discharged onto the stage 3 without being sandwiched between the transport roller 5a and the pressure roller 6a, so that it is possible to obtain an effect that the operation accuracy of taking out the short medium 1 is improved.

In the above embodiment, the pulse motor 9
Although it has been explained that the number of pulses given to the medium 1 is controlled and used to judge the amount of conveyance of the medium 1 or the medium length, a DC motor or the like is combined with a slit disk and a sensor to detect the rotation angle of the motor, or the driving time. It is also possible to judge the carry amount of the medium 1 and the medium length by managing the. Further, in the above-described embodiment, the length of the medium 1 is determined by using only the second sensor 20, but the length can be determined by using two sensors.

[0044]

As described above, according to the present invention, when the medium is ejected, the portion near the rear end of the medium is nipped by the conveying roller and the pressure roller located near the insertion / ejection port, and the conveying roller is By controlling the energization of the pulse motor so that it can rotate freely, it is possible to prevent the medium from dropping from the stage onto the outside of the device without damaging it when pulling it out or impairing the operability of pulling it out. Since there is no need to provide a special clamp mechanism, and the length of the stage can be set to the minimum necessary length in consideration of insertability of the medium, the effect of miniaturizing the device can be obtained.

[Brief description of drawings]

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

FIG. 2 is a block diagram of a main part of FIG.

FIG. 3 is a side view of a mechanism portion showing an embodiment of a medium processing device according to the present invention.

FIG. 4 is a perspective view of an essential part of the mechanism section of FIG.

FIG. 5 is a side view of an essential part showing the operation of the embodiment.

FIG. 6 is a flowchart showing the operation of another embodiment.

FIG. 7 is a side view of a main part when a medium length is determined.

[Explanation of Codes] 1 Medium 3 Stage 4 Inserting and discharging port 5a to 5d Conveying roller 6a to 6d Pressure roller 9 Pulse motor 10 Driving gear 11, 12 Idle gear 13 Driven gear 14a, 14b Pulley 15 Belt 16 Pulse motor 17 Printing head 19 1st sensor 20 2nd sensor 21 3rd sensor 22 Control part 23,24 Motor drive circuit 25 Storage part 26 Signal generation circuit 26

Claims (2)

[Claims] 1. A medium inserted from an insertion / ejection port provided at the rear end of the stage is conveyed to a processing section along a conveyance path, and after the processing section performs processing such as printing, the medium is reversed. In a medium processing device that conveys a sheet to a sheet and discharges it from the insertion and ejection port, a conveyance roller that is located in the vicinity of the insertion and ejection port and that is provided in the conveyance path, a pressure roller that is pressed against the conveyance roller, A motor that rotates the roller, a transmission unit that transmits the rotational force of the motor to the conveyance roller, a medium detection unit that is arranged closer to the processing unit than the conveyance roller, and a rotation amount of the motor. A rotation amount detecting means for detecting and outputting detection information, and the conveying roller and the pressure roller by energizing the motor to rotate the conveying roller when the medium is inserted. Holds the medium in the direction of the processing unit, and when the medium is ejected, the motor is energized in the opposite direction to rotate the transport roller in the opposite direction, thereby sandwiching the medium between the transport roller and the pressure roller. When the rear end of the medium in the conveying direction is detected by the medium detecting means, the vicinity of the rear end of the medium is detected based on the detection information of the rotation amount detecting means. In a state in which the portion of n is sandwiched between the transport roller and the pressure roller, the rotation of the transport roller is stopped, and a control means for controlling energization to the motor is provided so that the transport roller can freely rotate. Characteristic media processing device. 2. A medium inserted from an insertion / ejection port provided at the position of the rear end of the stage is conveyed to a processing section along a conveyance path, and after the processing section performs processing such as printing, the medium is reversed. In a medium processing device that conveys a sheet to a sheet and discharges it from the insertion and ejection port, a conveyance roller that is located in the vicinity of the insertion and ejection port and that is provided in the conveyance path, a pressure roller that is pressed against the conveyance roller, A motor that rotates the roller, a transmission unit that transmits the rotational force of the motor to the conveyance roller, a medium detection unit that is arranged closer to the processing unit than the conveyance roller, and a rotation amount of the motor. Rotation amount detecting means for detecting, storage means for storing the determination information of the length of the medium, by energizing the motor to rotate the transport roller when the medium is inserted, The medium is nipped by the feeding roller and the pressure roller to be conveyed in the direction of the processing section, and after the medium detecting means detects the leading end of the medium in the conveying direction, the medium is detected based on the detection information of the rotation amount detecting means. It is determined whether or not the medium is longer than a predetermined reference value depending on whether or not the rear end of the medium is detected by the medium detection means until the motor rotates by a certain amount, and the determination information is obtained. When the medium is ejected, the motor is energized in the opposite direction to reversely rotate the conveying roller, so that the medium is nipped by the conveying roller and the pressure roller to store the medium in the inserting / ejecting port. In the transport direction, the determination information stored in the storage means is determined, and when the medium is equal to or larger than a predetermined reference value, the medium is transported in the transport direction during the ejection. Is detected by the medium detecting means, the rotation of the conveying roller is stopped while the portion near the rear end of the medium is sandwiched between the conveying roller and the pressure roller based on the detection information of the rotation amount detecting means. And the energization of the motor is controlled so that the transport roller can rotate freely, and when the medium is less than a predetermined reference value, the portion near the rear end of the medium is set to the transport roller and the pressure roller. A medium processing apparatus comprising: a control unit that controls energization to the motor so that the transport roller is rotated until it is discharged onto the stage without being sandwiched by and.