Paper sheet conveying device and paper sheet handling device

Abstract

To prevent occurrence of a failure due to heat generation of a motor.SOLUTION: A bill conveyance device 1 includes: a reading unit 20 having a reading-side temperature sensor 29 and being configured to read a feature quantity of a bill P; a conveyance motor 110A configured to drive a conveyance roller pair 14; and control means 200 configured to control driving of the conveyance motor. The bill conveyance device includes a motor side-temperature sensor 140 configured to measure a temperature of the conveyance motor, and a heat conduction member 141 filling a space between the motor side-temperature sensor and the conveyance motor. The control means stops a motor for x1 second each time a bill is conveyed until the motor temperature becomes less than or equal to ta1 when it becomes more than or equal to ta2, stops the motor for x2 seconds each time a bill is conveyed until the motor temperature becomes less than or equal to ta3 when it becomes more than or equal to ta4, stops the motor until the motor temperature becomes less than or equal to ta4 when it becomes more than or equal to ta6, and stops the motor until a reading sensor temperature becomes less than or equal to tb1 when it becomes more than or equal to tb2, where tb1<tb2<ta1<ta2<ta3<ta4<ta6 and x1<x2 hold.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a paper sheet conveying device for conveying paper sheets such as banknotes, and a paper sheet handling device provided with the paper sheet conveying device.

Background Art

[0002] Conventionally, paper money handling devices such as bill deposit machines, various vending machines, and money changers are provided with a banknote conveying device that conveys banknotes (an example of paper sheets) in the storage direction or conveys banknotes in the payout direction. In recent years, miniaturization and high speed of banknote conveying devices have progressed, and various heat countermeasures have been considered.

[0003] Patent Document 1 describes a banknote storage device that can accurately process banknotes regardless of the temperature of the installation environment. In Patent Document 1, when the motor stops, the amount of heat generated by the motor is controlled by changing the amount of current flowing through the motor or the resistance value without driving the motor, so as to cope with changes in the environmental temperature. That is, when the environmental temperature is low, the amount of heat generated by the motor is increased by increasing the amount of current flowing through the motor or the resistance value, and delays in operations caused by temperature drops are suppressed. Conversely, when the environmental temperature is high, the amount of heat generated by the motor is reduced by reducing the amount of current flowing through the motor or the resistance value, and overheating of the motor is suppressed. In Patent Document 1, a banknote storage device with high operation reliability against changes in environmental temperature is realized even when the device is miniaturized and speeded up.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As paper sheet conveying devices become smaller, the mounting space for each component becomes limited. As a result, heat-sensitive components may have to be placed close to heat-generating components such as motors. In addition, increasing the speed of paper sheet processing can easily cause motors to overheat. Furthermore, if the paper sheet storage section located downstream of the paper sheet conveying device becomes larger in capacity, the motor may operate continuously for extended periods, which can also easily cause the motor to overheat.

[0006] In order to miniaturize paper sheet transport devices, increase processing speed, and increase the capacity of paper sheet storage units, it is necessary to take measures to prevent malfunctions caused by motor overheating.

[0007] This invention has been made in view of the above circumstances, and aims to provide a novel paper sheet conveying device that prevents malfunctions caused by motor overheating. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a paper sheet conveying device including a conveying path along which paper sheets are conveyed, a conveying means for conveying the paper sheets along the conveying path, a reading unit having a reading sensor for reading a characteristic amount of the paper sheets conveyed through the conveying path, a motor unit having a motor for driving the conveying means, and a control means for driving and controlling the motor. The motor unit includes a motor-side temperature sensor for measuring the temperature of the motor, and a heat conductive member filled between the motor-side temperature sensor and the motor. The reading unit includes a reading-side temperature sensor for measuring the temperature inside the reading unit. The control means performs control to stop the motor for x1 seconds until the motor-side temperature sensor detects a temperature of ta1 or less when the motor-side temperature sensor detects a temperature of ta2 or more, and alternately repeats control to drive the motor to convey n1 sheets of the paper sheets. When the motor-side temperature sensor detects a temperature of ta4 or more, control to stop the motor for x2 seconds until the motor-side temperature sensor detects a temperature of ta3 or less and control to drive the motor to convey n2 sheets of the paper sheets are alternately repeated. When the motor-side temperature sensor detects a temperature of ta6 or more, the motor is controlled to be stopped until the motor-side temperature sensor detects a temperature of ta4 or less. When the reading-side temperature sensor detects a temperature of tb2 or more, the motor is controlled to be stopped until the reading-side temperature sensor detects a temperature of tb1 or less. It is characterized in that. However, temperature tb1 < tb2 < ta1 < ta2 < ta3 < ta4 < ta6, and time x1 < x2.

Effect of the Invention

[0009] According to the present invention, it is possible to prevent the occurrence of problems due to the heat generation of the motor.

Brief Description of the Drawings

[0010] [Figure 1] It is a longitudinal sectional view showing the internal configuration of a banknote conveying device according to an embodiment of the present invention. [Figure 2] It is a cross-sectional view showing the positional relationship between the motor and the reading unit. [Figure 3] This is a side view of the transport motor unit. [Figure 4] This is a perspective view of the transport motor unit. [Figure 5] This is a block diagram of a banknote transport device showing the configuration related to motor control. [Figure 6] This diagram shows an example of a control method in a table format. [Figure 7] (a) and (b) are graphs showing examples of motor temperature changes when the control shown in Figure 6 is performed. [Modes for carrying out the invention]

[0011] The present invention will be described in detail below using embodiments shown in the figures. However, unless otherwise specified, the components, types, combinations, shapes, and relative arrangements described in these embodiments are not intended to limit the scope of the invention to these specific examples, but are merely illustrative examples.

[0012] Embodiments of the present invention will be described in detail below. [First Embodiment] Figure 1 is a longitudinal cross-sectional view showing the overall internal configuration of a banknote transport device according to one embodiment of the present invention. Figure 2 is a transverse cross-sectional view showing the positional relationship between the motor and the reading unit. Note that the longitudinal cross-sectional view is a view of the banknote transport device cut in the direction along the transport path, and the transverse cross-sectional view is a view of the banknote transport device cut in the direction perpendicular to the transport path. Figure 2 is a view of the inside of the banknote transport device observed from the front, and the code wheel 121 is not shown.

[0013] The banknote conveying device (sheet conveying device) 1 includes a banknote inlet (sheet inlet) 12 for receiving banknotes (sheets) P from the outside, a conveying path 10 through which the received banknotes are conveyed inside, a plurality of conveying roller pairs 14 (conveying means) sequentially arranged at appropriate positions on the conveying path 10 for conveying banknotes along the conveying path 10, a reading unit 20 (lower reading unit 20A, upper reading unit 20B) having a reading sensor arranged at an appropriate position in the conveying path 10 for reading the characteristic amounts of the banknotes conveyed in the conveying path 10, a conveying motor unit 100A (motor unit 100) having a conveying motor 110A (motor 110) for driving each conveying roller pair 14, and a control means 200 for driving and controlling the conveying motor 110A.

[0014] The conveying motor unit 100A includes a conveying motor side temperature sensor 140A (motor side temperature sensor 140) for measuring the surface temperature of the conveying motor 110A, and a heat conductive member 141 filled between the motor side temperature sensor 140 and the motor 110. The lower reading unit 20A includes a lower reading side temperature sensor 29A (reading side temperature sensor 29) for detecting the temperature inside the lower reading unit. The upper reading unit 20B includes an upper reading side temperature sensor 29B (reading side temperature sensor 29) for detecting the temperature inside the upper reading unit. When the motor side temperature sensor 140 detects a predetermined high temperature (temperatures ta2, ta4), the control means 200 intermittently drives the motor 110, and controls the motor 110 so as to stop receiving the banknotes P when the motor side temperature sensor 140 detects an even higher temperature (temperature ta6). Also, when the reading side temperature sensor 29 detects a predetermined high temperature (temperature tb2), the control means 200 controls the motor 110 so as to stop receiving the banknotes P.

[0015] <Banknote Conveying Device> The internal structure of the banknote conveying device will be described based on FIG. 1. In this example, banknotes are shown as an example of sheets, but this device can also be applied to the conveyance of sheets other than banknotes, such as securities, vouchers, tickets, etc.

[0016] The banknote transport device 1 is mounted on and used in a banknote handling device body (paper handling device body) such as a banknote depositor, various vending machines, and a money changer, which are not shown in the drawings. The banknote P received by the banknote transport device 1 is sequentially stored one by one in a cash box (banknote storage section) in the banknote handling device body after being authenticated as genuine or fake and identified by denomination based on the information read by the reading sensor. Note that the banknote handling device (paper handling device) includes the banknote handling device body and the banknote transport device 1.

[0017] The banknote transport device 1 includes a lower unit 3 and an upper unit 4 that is supported by the lower unit 3 so as to be openable and closable. When each unit shown in FIG. 1 is in a closed state, a banknote transport path (transport path) 10 is formed between the opposing surfaces of the units.

[0018] At one end of the transport path 10, there is provided a banknote inlet 12 for introducing the banknote P into the banknote transport device 1. Inside the banknote inlet 12, there are arranged a plurality of transport roller pairs 14, 14... along the transport path 10, a reading unit 20 for reading information for identifying the denomination and authenticity of the banknote from the banknote, and a banknote outlet (paper outlet) 16 for discharging the banknote to a banknote storage bin (paper storage bin, external device) 300. Further, at appropriate positions inside the banknote transport device 1, there are arranged a transport motor unit 100A including a transport motor 110A for driving each transport roller pair 14 for banknote transport, and control means (CPU, MPU, ROM, RAM) 200 for determining the denomination and authenticity of the banknote based on the identification information from the reading unit 20, and for controlling the transport motor 110A and other control targets based on banknote detection signals from various paper passage sensors, which are not shown.

[0019] The banknote transport device 1 includes an external output gear 150 that outputs a driving force to the outside, and a storage motor unit 100B (motor unit 100) including a storage motor 110B (motor 110, second motor) for driving the external output gear 150. The storage motor 110B is driven and controlled by the control means 200.

[0020] Each transport roller pair 14 consists of a drive roller located on the lower unit 3 side and a driven roller located on the upper unit 4 side, and is configured to nip both sides of a banknote during transport.

[0021] The banknote transport device 1 comprises a lower reading unit 20A located below the transport path 10 and an upper reading unit 20B located above the transport path 10. The lower reading unit 20A reads information from the bottom (one side) of the banknote, and the upper reading unit 20B reads information from the top (other side) of the banknote. The reading unit 20 is a contact image sensor (CIS) that reads, for example, the optical pattern of a banknote. The reading unit 20 includes a sensor control board 27 on which a light-receiving element 25 is mounted. A reading-side temperature sensor 29 that detects the temperature inside the reading unit is mounted on the sensor control board 27 of the reading unit 20.

[0022] In addition to sensors that recognize the optical patterns (optical features) of banknotes, magnetic sensors that recognize the magnetic patterns (magnetic features) of banknotes can also be used as reading units.

[0023] A banknote storage unit 300, which has a banknote storage section (paper sheet storage section) (not shown) inside, is connected to the banknote transport device 1. The banknote outlet 16 communicates with the banknote receiving slot (paper sheet receiving slot) 301 of the banknote storage unit 300. The banknote storage unit 300 stores the banknotes received from the banknote transport device 1 via the banknote receiving slot 301 into the banknote storage section. The banknote storage compartment 300 is equipped with a driven gear 303 that meshes with an external output gear 150 to obtain driving force from the storage motor 110B. By obtaining driving force from the outside, the banknote storage compartment 300 operates the gears and other components inside the banknote storage compartment 300 to store banknotes in the banknote storage section.

[0024] The control means 200 consists of a unit equipped with a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory), or an MPU (Micro Processing Unit) that incorporates these and other necessary modules into a single chip. Various functions and means are realized when the CPU reads a program from the ROM, loads it into the RAM, and executes it.

[0025] The above configuration of the banknote transport device 1 is merely an example, and various modifications are possible. For example, various changes and component selections are possible, such as the number of motors used, the arrangement of roller pairs and transport belts, and the type of reading unit.

[0026] <Motor Unit> Figure 3 is a side view of the motor unit. Figure 4 is a perspective view of the motor unit. The transport motor unit 100A and the housing motor unit 100B have some differences in the arrangement of their components, but their basic configurations are the same. Hereafter, the transport motor unit 100A and the housing motor unit 100B will be described without making any particular distinction between them.

[0027] The motor unit 100 includes a motor 110, a pinion gear 115 fixed to one end 113a of the motor shaft 113 of the motor 110, an encoder unit 120 attached to the other end of the motor 110 to detect the rotation of the motor shaft 113, and a motor-side temperature sensor 140 (transport motor-side temperature sensor 140A, storage motor-side temperature sensor 140B) for measuring the temperature of the motor 110.

[0028] <<Motor Pinion Gear>> The motor 110 comprises a generally cylindrical housing 111 that houses the rotor and stator and has closed ends, and a motor shaft 113 that rotates integrally with the rotor and has both axial ends protruding from the axial end faces 111a and 111b of the housing 111. For example, the housing 111 is composed of a bottomed cylindrical motor case with one axial end face 111a closed and the other end face 111b open, and an end bell that closes the other end face of the motor case. The housing 111 is conductive.

[0029] A pinion gear 115 is fixed to one axial end 113a of the motor shaft 113 so as to rotate coaxially and integrally with the motor shaft 113. The pinion gear 115 is made of resin and transmits driving force to downstream gears, rollers, or belts.

[0030] <<Encoder Unit>> The encoder unit 120 includes a code wheel 121, an optical element (rotation detection means) 129 that detects the teeth 125 (slits 127) of the code wheel 121, a processing means 131 that processes the electrical signal output by the optical element 129, and a motor board 133 on which the optical element 129 and the processing means 131 are mounted.

[0031] The code wheel 121 is fixed to the other axial end 113b of the motor shaft 113 and rotates coaxially and integrally with the motor shaft 113. The code wheel 121 comprises a disc portion 123 fixed to the motor shaft 113, and a plurality of teeth 125 (slits 127) that protrude from the outer circumference of the disc portion 123 toward the motor 110 (towards the motor substrate 133) along the axial direction of the motor shaft 113 and are arranged at predetermined intervals along the circumferential direction of the disc portion 123. The teeth 125 and slits 127 function as scales that the optical element 129 reads in order to detect the rotation of the motor 110.

[0032] The motor board 133 is positioned between the code wheel 121 and the motor 110. The motor board 133 is positioned such that the other axial end 113b of the motor shaft 113 passes through its plane, and one surface 133a faces the other axial end surface 111b of the housing 111 at a predetermined distance. The code wheel 121 is fixed to the other end 113b of the motor shaft 113 that protrudes from the other surface 133b side of the motor board 133.

[0033] The motor board 133 is arranged parallel to the code wheel 121. An optical element 129 and a processing means 131 are mounted on the other side 133b of the motor board 133. The optical element 129 is a photointerrupter including a light-emitting element and a light-receiving element arranged so as to sequentially sandwich each tooth 125 (each slit 127) of the rotating code wheel 121. The processing means 131 includes at least an output terminal for outputting an electrical signal to the outside. The processing means 131 may include an A / D converter, a signal processing IC, etc. The gap between the motor board 133 and the housing 111 prevents short circuits of various electrical components via the housing 111 and solder exposed on one side 133a of the motor board 133.

[0034] By making the teeth 125 of the code wheel bent from the disc portion 123 (bent at a right angle), the motor unit 100 can be easily assembled. Unitizing (assembling) the motor 110 and the encoder unit 120 improves the maintainability of the components around the motor. In addition, the motor unit 100 is configured compactly.

[0035] <<Motor-side temperature sensor>> A motor-side temperature sensor 140 is mounted on one side 133a of the motor board 133. The motor-side temperature sensor 140 is, for example, a packaged temperature sensor IC. Since the motor-side temperature sensor 140 is positioned in the gap between the motor board 133 and the housing 111, it does not lead to an increase in the size of the motor unit 100 or the banknote transport device 1 equipped therewith.

[0036] A heat conduction member 141 is positioned between the motor-side temperature sensor 140 and the other axial end face 111b of the motor 110. The heat conduction member 141 is in close contact with both the motor 110 and the motor-side temperature sensor 140. The heat conduction member 141 transfers heat from the housing 111 to the motor-side temperature sensor 140. The motor-side temperature sensor 140 measures the temperature of the outer surface of the motor 110 via the heat conduction member 141.

[0037] It is desirable that the heat conductive member 141 covers the entire surface of the motor-side temperature sensor 140 that faces the motor 110. The heat conductive member 141 is set to be the same size as or larger than the surface of the motor-side temperature sensor 140. Examples of the heat conductive member 141 include, but are not limited to, a flexible or pliable heat conductive sheet.

[0038] <<Motor Unit Arrangement>> The motor units 100A and 100B are located below the transport path 10. The entire motor shaft 113 overlaps with the transport path 10 in the vertical direction. The motor units 100A and 100B are positioned below the reading units 20A and 20B. The motor units 100A and 100B are positioned so as to overlap at least a portion of the reading units 20A and 20B in the vertical direction.

[0039] As shown in Figure 1, the motor units 100A and 100B are arranged so that the motor shafts 113 extend in the longitudinal direction of the transport path 10 (the direction in which banknotes are transported). Also, as shown in Figure 2, the motor units 100A and 100B are arranged side by side in the width direction that intersects (is perpendicular to) the longitudinal direction of the transport path 10. A portion of the motor shaft 113, which is the hottest part of the motor 110, is positioned to overlap vertically with the reading units 20A and 20B. For this reason, the lower reading unit 20A is particularly susceptible to overheating due to the heat rising from the two motors 110A and 110B.

[0040] <Functional Configuration> Figure 5 is a block diagram of a banknote transport device showing the configuration related to motor control. The motor-side temperature sensors 140A and 140B and the reading-side temperature sensors 29A and 29B are connected to each input terminal of the control means 200. The conveyance motor 110A and the storage motor 110B are connected to each output terminal of the control means 200. The control means 200 restricts the driving time of the conveyance motor 110A and the storage motor 110B according to the temperature of each part detected by each temperature sensor 140 and 29.

[0041] <<Control Example>> FIG. 6 is a diagram showing an example of the control method in a table. As shown in control (1) in the table, when the motor-side temperature sensor 140 detects a temperature of ta2 or higher, until the motor-side temperature sensor 140 detects a temperature of ta1 or lower, the control means 200 alternately repeats the control of stopping the motor 110 for x1 seconds and the control of driving the motor 110 to convey one sheet (n1 sheets) of banknote. As shown in control (2) in the table, when the motor-side temperature sensor 140 detects a temperature of ta4 or higher, until the motor-side temperature sensor 140 detects a temperature of ta3 or lower, the control means 200 alternately repeats the control of stopping the motor 110 for x2 seconds and the control of driving the motor 110 to convey one sheet (n2 sheets) of banknote.

[0042] As shown in control (3) in the table, when the motor-side temperature sensor 140 detects a temperature of ta6 or higher, until the motor-side temperature sensor 140 detects a temperature of ta4 or lower, the control means 200 controls to stop the motor 110. As shown in control (4) in the table, when the reading-side temperature sensor 29 detects a temperature of tb2 or higher, until the reading-side temperature sensor 29 detects a temperature of tb1 or lower, the control means 200 controls to stop the motor 110. However, temperature tb1 < tb2 < ta1 < ta2 < ta3 < ta4 < ta6, time x1 < x2, and the number of sheets n1 ≧ n2.

[0043] Here, the set temperatures ta1 to ta6 are set to protect the pinion gear 115. For example, temperature ta2 is set so that the pinion gear 115 does not exceed its normal operating temperature. Temperature ta4 is set so that the pinion gear does not exceed its maximum operating temperature. Temperature ta6 is set so that the pinion gear does not exceed its softening temperature. However, it is difficult to directly detect the temperature of the pinion gear 115 or the motor shaft 113. Therefore, the set temperatures ta1 to ta6 are set based on the correlation between the surface temperature of the motor 110 and the temperature of the pinion gear 115. Furthermore, the set temperature tb2 is configured to protect the reading unit 20. The temperature tb2 is set so that the reading unit 20 does not exceed the upper limit of the permissible operating temperature.

[0044] Figures 7(a) and 7(b) are graphs showing examples of motor temperature changes when the control shown in Figure 6 is executed. (a) shows an example where control (1) and control (2) are executed, and (b) shows an example where only control (1) is executed. P1 to P6 in Figure 7(a) and Q1 to Q9 in Figure 7(b) indicate the number of sheets of paper passed.

[0045] In Figure 7(a), the motor temperature rises sharply up to the number of paper sheets P1, at which point no control is applied. When the motor-side temperature sensor detects temperature ta2, control (1) is executed. Even after control (1) is executed, the motor temperature does not fall below temperature ta1, so control (1) is executed repeatedly. As control (1) is executed, the motor temperature fluctuates slightly up and down, continuing to rise slowly. When the motor-side temperature sensor detects temperature ta4, control (2) is executed. As a result of control (2), the motor temperature falls below temperature ta3, so control (1) is executed. In this way, as control (1) and control (2) are repeatedly executed, the motor temperature fluctuates between temperature ta2 and temperature ta4, maintaining a temperature below ta6.

[0046] In Figure 7(b), the motor temperature rises sharply up to the paper feed count Q1, where no control is performed. When the motor-side temperature sensor detects temperature ta2, control (1) is executed. As a result of the execution of control (1), the motor temperature falls below temperature ta1, and control (1) is released. After control (1) is released, when the motor-side temperature sensor detects temperature ta2 again, control (1) is executed. In this way, the motor temperature fluctuates by repeatedly switching between the execution and non-execution states of control (1). In this example, even if control (2) is not executed, the motor temperature remains below ta6.

[0047] [Summary of Embodiments, Functions, and Effects of the Invention] <First Embodiment> The paper sheet transport device (banknote transport device 1) according to this embodiment comprises a transport path 10 on which paper sheets (banknotes P) are transported, a transport means (pair of transport rollers 14) for transporting paper sheets along the transport path, a reading unit 20 having a reading sensor (light receiving element 25) for reading characteristic quantities of paper sheets transported along the transport path, a motor unit (transport motor unit 100A) having a motor (transport motor 110A) for driving the transport means, and a control means 200 for driving and controlling the motor. The motor unit includes a motor-side temperature sensor 140 for measuring the motor temperature, and a heat conductive member 141 filled between the motor-side temperature sensor and the motor. The reading unit has a reading-side temperature sensor 29 that measures the temperature inside the reading unit.

[0048] The control means alternately repeats the following actions: when the motor-side temperature sensor detects a temperature of ta2 or higher, it stops the motor for x1 seconds until the motor-side temperature sensor detects a temperature of ta1 or lower, and then drives the motor to transport n1 sheets (1 sheet) of paper. The control means alternately repeats the following actions: when the motor-side temperature sensor detects a temperature of ta4 or higher, it stops the motor for x2 seconds until the motor-side temperature sensor detects a temperature of ta3 or lower, and then drives the motor to transport n2 sheets of paper. When the motor-side temperature sensor detects a temperature of ta6 or higher, the control means controls to stop the motor until the motor-side temperature sensor detects a temperature of ta4 or lower. When the reading-side temperature sensor detects a temperature of tb2 or higher, the control means controls to stop the motor until the reading-side temperature sensor detects a temperature of tb1 or lower. However, tb1 < tb2 < ta1 < ta2 < ta3 < ta4 < ta6 and time x1 < x2.

[0049] According to this aspect, when the motor reaches a predetermined high temperature, the operating time of the motor is limited to reduce the heat generation of the motor, so it is possible to prevent the occurrence of problems due to the heat generation of the motor.

[0050] <Second Embodiment> Relating to this aspect paper In the leaf conveying device (banknote conveying device 1), the motor (conveying motor 110A) includes a housing 111 that houses a rotor, and a motor shaft 113 that rotates integrally with the rotor and both axial end portions 113a and 113b protrude from the respective end faces 111a and 111b in the axial direction of the housing. The motor unit (conveying motor unit 100A) is arranged such that the other axial end portion 113b of the motor shaft 113 penetrates in the plane, and one surface 133a faces the other end face 111b in the axial direction of the housing 111 with a predetermined interval. A motor substrate 133, a code wheel 121 fixed to the other end portion 113b of the motor shaft protruding to the other surface 133b side of the motor substrate and having graduations (tooth portions 125, slits 127) formed along the circumferential direction, and a rotation detection means (optical element 129) mounted on the other surface side of the motor substrate to detect the graduations of the code wheel. The motor-side temperature sensor is mounted on one surface side of the motor substrate.

[0051] The code wheel, the rotation detection means, and the motor substrate constitute an encoder unit. The motor substrate is used as the mounting destination of the motor-side temperature sensor. There is a gap between the motor board and the housing, and various electrical components are configured to prevent short circuits through the housing. The motor-side temperature sensor is, for example, a temperature sensor IC, and is placed in the gap between the motor board and the housing. A heat conductive material 141 is filled in the gap between the motor-side temperature sensor and the housing, and the motor-side temperature sensor detects the motor temperature through the heat conductive material.

[0052] According to this embodiment, the motor, encoder unit, and temperature sensor are assembled into an assembly, resulting in high maintainability and a compact motor unit configuration. The motor-side temperature sensor is positioned in the gap between the motor board and the housing using the motor board, thus avoiding an increase in the size of the device.

[0053] <Third Embodiment> In the paper sheet transport device (banknote transport device 1) according to this embodiment, the motor (transport motor 110A) is positioned below the reading unit 20 in a positional relationship that overlaps with at least a part of the reading unit 20 in the vertical direction.

[0054] The reading unit may experience problems such as distortion of the read image when it becomes hot. In this embodiment, the reading unit is positioned above the motor, which is a heat-generating component, and is therefore susceptible to the effects of the motor's temperature rise. According to this embodiment, when the motor reaches a predetermined high temperature, the motor's operating time is limited to reduce heat generation, or the motor is stopped to prevent overheating, thereby preventing problems caused by overheating of the reading unit.

[0055] <Fourth Embodiment> The paper sheet transport device (banknote transport device 1) according to this embodiment is characterized in that it is equipped with a second motor (storage motor 110B) which is positioned adjacent to a motor (transport motor 110A) below the reading unit 20 and outputs driving force to an external device (banknote storage compartment 300), and the second motor is positioned in a positional relationship that overlaps with at least a part of the reading unit in the vertical direction.

[0056] The second motor functions as a power source, for example, when a banknote storage compartment without its own power source performs the banknote storage operation. The reading unit is located above the two motors, making it susceptible to temperature increases from both motors. According to this embodiment, when the motor reaches a predetermined high temperature, the motor's operating time is limited to reduce heat generation, or the motor is stopped to prevent overheating, thereby preventing problems caused by overheating of the reading unit.

[0057] <Fifth Embodiment> In the paper sheet transport device (banknote transport device 1) according to this embodiment, the code wheel 121 comprises a disc portion 123 arranged parallel to the motor board 133, and a plurality of teeth 125 that protrude from the outer circumference of the disc portion toward the motor board along the axial direction of the motor shaft 113 and are arranged at predetermined intervals along the circumferential direction of the disc portion. The rotation detection means (optical element 129) is characterized by being a photointerrupter that includes a light-emitting element and a light-receiving element arranged to sequentially sandwich each tooth of the rotating code wheel.

[0058] By bending the teeth of the code wheel at a right angle to the disc portion, the motor unit can be easily assembled. Unitizing (assembling) the motor and encoder unit improves the maintainability of the components around the motor. In addition, the motor unit is configured compactly.

[0059] <Sixth Embodiment> In the present embodiment of the paper sheet conveying device (banknote conveying device 1), the motor (conveying motor 110A) comprises a housing 111 that houses a rotor, and a motor shaft 113 that rotates integrally with the rotor and has both axial ends 113a and 113b protruding from the respective axial end faces 111a and 111b of the housing. A resin pinion gear 115, which transmits driving force to the conveying means (pair of conveying rollers 14), is fixed to one end 113a of the motor shaft in the axial direction. The temperature ta2 is set so that the pinion gear does not exceed its normal operating temperature. The temperature ta4 is set so that the pinion gear does not exceed its maximum operating temperature. The temperature ta6 is set so that the pinion gear does not exceed its softening temperature. The temperature tb2 is set so as not to exceed the upper limit of the allowable operating temperature for the reading unit 20.

[0060] Resin pinion gears may soften at high temperatures, potentially preventing them from transmitting driving force. Temperatures ta2, ta4, and ta6 are set to protect the pinion gear. According to this embodiment, problems such as the pinion gear softening and slipping can be prevented. The reading unit may experience problems such as distortion of the read image when it reaches high temperatures. The temperature tb2 is set to protect the reading unit. According to this embodiment, it is possible to prevent problems such as distortion of the read image and inability to properly identify the transported paper sheets.

[0061] <Seventh Embodiment> This embodiment is a paper sheet handling device characterized by being equipped with a paper sheet conveying device. The paper handling device according to this embodiment enjoys the various effects of the paper conveying device (banknote conveying device 1). [Explanation of symbols]

[0062] P...Banknotes (paper sheets), 1...Banknote transport device (paper sheet transport device), 3...Lower unit, 4...Upper unit, 10...Transport path, 12...Banknote entrance (paper sheet entrance), 14...Transport roller pair (transport means), 16...Banknote exit (paper sheet exit), 20...Reading unit, 20A...Lower reading unit, 20B...Upper reading unit, 25...Light receiving element (reading sensor), 27...Sensor control board, 29...Reading side temperature sensor, 29A...Lower reading side temperature sensor, 29B...Upper reading side temperature sensor, 100...Motor unit, 100A...Transport motor unit, 100B...Housing motor unit, 110...Motor, 110A...Transport motor, 110B...Housing motor (second motor), 111...Housing, 111a ...one end face, 111b...other end face, 113...motor shaft, 113a...one end, 113b...other end, 115...pinion gear, 120...encoder unit, 121...code wheel, 123...disk part, 125...teeth (scale), 127...slit (scale), 129...optical element (rotation detection means), 131...processing means, 133...motor board, 133a...one side, 133b...other side, 140...motor side temperature sensor, 140A...transport motor side temperature sensor, 140B...storage motor side temperature sensor, 141...heat conductive member, 150...external output gear, 200...control means, 300...banknote storage compartment (paper sheet storage compartment, external device), 301...banknote receiving slot (paper sheet receiving slot), 303...driven gear

Claims

1. A paper sheet conveying device comprising: a conveying path through which paper sheets are conveyed; conveying means for conveying the paper sheets along the conveying path; a reading unit having a reading sensor for reading characteristic quantities of the paper sheets being conveyed along the conveying path; a motor unit having a motor for driving the conveying means; and control means for driving and controlling the motor, The motor unit includes a motor-side temperature sensor for measuring the temperature of the motor, and a heat conductive member filled between the motor-side temperature sensor and the motor. The reading unit has a reading-side temperature sensor that measures the temperature inside the reading unit. The control means is When the motor-side temperature sensor detects a temperature of ta2 or higher, the motor is stopped for x1 seconds until the motor-side temperature sensor detects a temperature of ta1 or lower, and the motor is driven to transport n1 sheets of paper, and these commands are repeated alternately. When the motor-side temperature sensor detects a temperature of ta4 or higher, the motor is stopped for x2 seconds until the motor-side temperature sensor detects a temperature of ta3 or lower, and the motor is driven to transport n2 sheets of paper, and these two processes are repeated alternately. When the motor-side temperature sensor detects a temperature of ta6 or higher, the motor is controlled to stop until the motor-side temperature sensor detects a temperature of ta4 or lower. A paper sheet conveying device characterized in that, when the reading-side temperature sensor detects a temperature of tb2 or higher, the motor is controlled to stop until the reading-side temperature sensor detects a temperature of tb1 or lower. However, the temperature tb1 < tb2 < ta1 < ta2 < ta3 < ta4 < ta6 and the time x1 < x2.

2. The motor comprises a housing for a rotor and a motor shaft that rotates integrally with the rotor and whose axial ends protrude from the axial end faces of the housing. The motor unit comprises a motor board through which the other axial end of the motor shaft passes in the plane, and which is positioned such that one surface faces the other axial end surface of the housing at a predetermined distance; a code wheel fixed to the other end of the motor shaft protruding from the other side of the motor board and having a scale formed along its circumference; and a rotation detection means mounted on the other side of the motor board for detecting the scale on the code wheel. The paper sheet transport apparatus according to claim 1, characterized in that the motor-side temperature sensor is mounted on one side of the motor board.

3. The paper sheet transport device according to claim 2, characterized in that the motor is positioned below the reading unit in a positional relationship that overlaps with at least a portion of the reading unit in the vertical direction.

4. The paper sheet transport device according to claim 3, further comprising a second motor positioned adjacent to the motor below the reading unit and outputting driving force to an external device, wherein the second motor is positioned in a positional relationship with at least a part of the reading unit in the vertical direction.

5. The code wheel comprises a disc portion arranged parallel to the motor board, and a plurality of teeth that protrude from the outer circumference of the disc portion toward the motor board along the axial direction of the motor shaft and are arranged at predetermined intervals along the circumferential direction of the disc portion. The paper sheet transport apparatus according to claim 2, characterized in that the rotation detection means is a photointerrupter including a light-emitting element and a light-receiving element arranged to sequentially sandwich each tooth of the rotating code wheel.

6. The motor comprises a housing for a rotor and a motor shaft that rotates integrally with the rotor and whose axial ends protrude from the axial end faces of the housing. A resin pinion gear that transmits driving force to the conveying means is fixed to one end of the motor shaft in the axial direction. The temperature ta2 is set so that the pinion gear does not exceed its normal operating temperature. The temperature ta4 is set so that the pinion gear does not exceed its maximum operating temperature. The temperature ta6 is set so that the pinion gear does not exceed its softening temperature. The paper sheet transport device according to claim 1, characterized in that the temperature tb2 is set so as not to exceed the upper limit of the allowable operating temperature of the reading unit.

7. A paper sheet handling device characterized by comprising a paper sheet conveying device according to any one of claims 1 to 6.

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