Paper bill conveying device and paper bill handling device

Abstract

The present invention prevents the occurrence of anomalous events due to the generation of motor heat. This paper bill conveying device 1 includes a reading unit 20 that has a reading side temperature sensor 29 and that reads a feature quantity of a paper bill P, a conveying motor 110A that drives a pair of conveying rollers 14, and a control means 200 that drives and controls the conveying motor. The paper bill conveying device includes a motor-side temperature sensor 140 that measures the temperature of the conveying motor, and a heat conduction member 141 filling the space between the motor-side temperature sensor and the conveying motor. The control means stops the motor for x1 seconds each time one paper bill is conveyed until the motor temperature drops to ta1 or therebelow when the motor temperature reaches ta2 or above, stops the motor for x2 seconds each time one paper bill is conveyed until the motor temperature drops to ta3 or therebelow when the motor temperature reaches ta4 or above, stops the motor until the temperature drops to ta4 or therebelow when the motor temperature reaches ta6 or greater, and stops the motor until the read sensor temperature drops to tb1 or therebelow when the read sensor temperature reaches tb2 or above (tb1 < tb2 < ta1 < ta2 < ta3 < ta4 < ta6, and x1 < x2).

Description

PAPER SHEET TRANSPORT DEVICE AND PAPER SHEET HANDLING DEVICE Field

[0001] The present invention relates to a paper sheet transport device that transports paper sheets such as banknotes, and a paper sheet handling device including the paper sheet transport device. Background

[0002] A banknote transport device that transports banknotes (an example of paper sheets) in a storing direction or transports banknotes in a dispensing direction is conventionally installed in a banknote handling device such as a banknote deposit machine, various types of automatic vending machines, or a change machine. In recent years, downsizing and increase in the speed of a banknote transport device have progressed and diverse countermeasures against heat have been considered.

[0003] Patent Literature 1 describes a banknote storage device that can accurately process banknotes regardless of the temperature of installation environments. In Patent Literature 1, changes in the environmental temperature are addressed by changing the amount of current flowing in a motor or the resistance value thereof at the time of stop of the motor, without driving the motor, to control the amount of heat generated by the motor. That is, when the environmental temperature is low, the amount of current flowing in the motor or the resistance value thereof is increased to increase the generated heat amount of the motor, thereby suppressing a delay or the like in the operation caused by a temperature decrease. On the other hand, when the environmental temperature is high, the amount of current flowing in the motor or the resistance value thereof is decreased to decrease the generated heat amount of the motor, thereby suppressing overheat or the like of the motor. In Patent Literature 1, a banknote storage device having a high operation reliability with respect to changes in the environmental temperature is realized even in a case where the device is downsized and is increased in the speed. Citation List Patent Literature

[0004] Patent Literature 1: Japanese Patent Application Laid-open No. 2000-67302 Summary Technical Problem

[0005] When the downsizing of a paper sheet transport device progresses, the space on which components are mounted is limited. As a result, components that are susceptible to heat are sometimes forced to be arranged in the vicinity of a heat-generating component such as a motor. When processing of paper sheets is speeded up, the motor is likely to have a high temperature. Furthermore, when the capacity of a paper sheet storing part arranged downstream of the paper sheet transport device is increased, there is a possibility that the motor is continuously operated for a long time and the motor is likely to have a high temperature.

[0006] To advance the downsizing and the speed-up of processing of the paper sheet transport device, and increase in the capacity of the paper sheet storing part, measures to prevent occurrent of problems due to heat generation of the motor need to be taken.

[0007] The present invention has been made in view of the above circumstances, and has an object to provide a novel paper sheet transport device that prevents problems caused by heat generation of a motor. Solution to Problem

[0008] In order to solve the above problems, the present invention is a paper sheet transport device including a transport route on which paper sheets are transported, a transport unit that transports the paper sheets along the transport route, a reading unit that has a reading sensor reading a feature amount of each of the paper sheets transported on the transport route, a motor unit that has a motor driving the transport unit, and a controller that executes driving control of the motor, wherein the motor unit includes a motor-side temperature sensor that measures a temperature of the motor, and a thermally conductive member filled between the motor-side temperature sensor and the motor, the reading unit includes a reading-side temperature sensor that measures a temperature in the reading unit, and the controller alternately repeats control to stop the motor for x1 seconds and control to drive the motor to transport n1 of the paper sheets until the motor-side temperature sensor detects a temperature ta1 or a lower temperature, when the motor-side temperature sensor detects a temperature ta2 or a higher temperature, alternately repeats control to stop the motor for x2 seconds and control to drive the motor to transport n2 of the paper sheets until the motor-side temperature sensor detects a temperature ta3 or a lower temperature, when the motor-side temperature sensor detects a temperature ta4 or a higher temperature, executes control to stop the motor until the motor-side temperature sensor detects the temperature ta4 or a lower temperature, when the motor-side temperature sensor detects a temperature ta6 or a higher temperature, and executes control to stop the motor until the reading-side temperature sensor detects a temperature tb1 or a lower temperature, when the readingside temperature sensor detects a temperature tb2 or a higher temperature. Note that the temperatures hold a relation tb1<tb2<ta1<ta2<ta3<ta4<ta6, and the times hold a relation x1<x2. Advantageous Effects of Invention

[0009] According to the present invention, it is possible to prevent problems caused by heat generation of a motor. Brief Description of Drawings

[0010] [FIG. 1] FIG. 1 is a vertical sectional view illustrating an entire internal configuration of a banknote transport device according to one embodiment of the present invention. [FIG. 2] FIG. 2 is a transverse sectional view illustrating a positional relation between a motor and a reading unit. [FIG. 3] FIG. 3 is a side view of a transport motor unit. [FIG. 4] FIG. 4 is a perspective view of the transport motor unit. [FIG. 5] FIG. 5 is a block diagram of the banknote transport device, illustrating a configuration related to motor control. [FIG. 6] FIG. 6 is a diagram illustrating one example of a control method in a table. [FIGS. 7] FIGS. 7(a) and 7(b) are diagrams illustrating examples of temperature changes of the motor in a case where the control illustrated in FIG. 6 is executed, by graphs. Description of Embodiments

[0011] The present invention will be described in detail below with embodiments illustrated in the drawings. However, constituent elements, types, combinations, shapes, relative arrangements thereof, and the like described in the embodiments are not intended to limit the scope of the present invention thereto and are merely explanatory examples unless specifically described.

[0012] Embodiments of the present invention will be described in detail below. [First embodiment] FIG. 1 is a vertical sectional view illustrating the entire internal configuration of a banknote transport device according to one embodiment of the present invention. FIG. 2 is a transverse sectional view illustrating a positional relation between a motor and a reading unit. The vertical sectional view is a view of the banknote transport device cut in a direction along a transport route, and the transverse sectional view is a view of the banknote transport device cut in a direction orthogonal to the transport route. FIG. 2 is a view of an inner part of the banknote transport device observed from the front face (front) side and illustration of a code wheel 121 is omitted.

[0013] A banknote transport device (a paper sheet transport device) 1 includes a banknote inlet (a paper sheet inlet) 12 that receives banknotes (paper sheets) P from outside, a transport route 10 on which banknotes received to inside are transported, a plurality of transport roller pairs 14 (a transport unit) that are sequentially arranged at appropriate places of the transport route 10 and that transport the banknotes along the transport route 10, a reading unit 20 (a lower reading unit 20A and an upper reading unit 20B) that is arranged at an appropriate place in the transport route 10 and that has a reading sensor reading the feature amount of each of the banknotes transported on the transport route 10, a transport motor unit 100A (a motor unit 100) that has a transport motor 110A (a motor 110) that drives the transport roller pairs 14, and a controller 200 that executes driving control of the transport motor 110A.

[0014] The transport motor unit 100A includes a transport motor-side temperature sensor 140A (a motor-side temperature sensor 140) that measures the surface temperature of the transport motor 110A, and a thermally conductive member 141 that is 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 (a reading-side temperature sensor 29) that detects the temperature in the lower reading unit. The upper reading unit 20B includes an upper reading-side temperature sensor 29B (the reading-side temperature sensor 29) that detects the temperature in the upper reading unit. The controller 200 controls the motor 110 to intermittently drive the motor 110 when the motor-side temperature sensor 140 detects a predetermined high temperature (a temperature ta2 or ta4) and to stop receiving of paper sheets P when the motor-side temperature sensor 140 detects a higher temperature (a temperature ta6). The controller 200 also controls the motor 110 to stop receiving of paper sheets P when the reading-side temperature sensor 29 detects a predetermined high temperature (a temperature tb2).

[0015] <Banknote transport device> An internal configuration of the banknote transport device is explained with reference to FIG. 1. While banknotes are described as one example of paper sheets in this example, the present device is applicable also to transport of paper sheets other than banknotes, for example, securities, cash vouchers, and tickets.

[0016] The banknote transport device 1 is used in a state installed in a banknote handling device body (a paper sheet handling device body) such as a banknote deposit machine, various types of automatic vending machines, or a change machine (not illustrated). Banknotes P received by the banknote transport device 1 are sequentially stored one by one in a cashbox (a banknote storing part) in the banknote handling device body after being subjected to recognition of authenticity and denomination of the banknotes on the basis of information read by the reading sensor. The banknote handling device (the paper sheet handling device) is configured to include 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 to be openable and closable with respect to the lower unit 3, and the banknote transport route (the transport route) 10 is formed between opposed surfaces of these units when the units are in a closed state as illustrated in FIG. 1.

[0018] The banknote inlet 12 that introduces banknotes P to the inside of the banknote transport device 1 is located at one end of the transport route 10, and the transport roller pairs 14, 14 •••, the reading unit 20 that reads information from each banknote to recognize the denomination and the authenticity of the banknote, and a banknote outlet (a paper sheet outlet) 16 from which banknotes are discharged to a banknote storage (a paper sheet storage, an external device) 300 are arranged in an inner part than the banknote inlet 12 along the transport route 10. The transport motor unit 100A including the transport motor 110A that drives the transport roller pairs 14 for banknote transport, and the controller (a CPU, an MPU, a ROM, and a RAM) 200 that judges the denomination and the authenticity of each banknote on the basis of recognition information from the reading unit 20 or that controls the transport motor 110A and other control targets on the basis of a banknote detection signal from each of tracking sensors (not illustrated) are arranged at appropriate places in the banknote transport device 1.

[0019] The banknote transport device 1 includes an external output gear 150 that outputs drive force to outside, and a storage motor unit 100B (the motor unit 100) including a storage motor 110B (a motor 110, a second motor) that drives the external output gear 150. Driving of the storage motor 110B is controlled by the controller 200.

[0020] Each of the transport roller pairs 14 is constituted of a drive roller arranged on the side of the lower unit 3 and a driven roller arranged on the side of the upper unit 4, and includes a configuration to transport a banknote while nipping both sides of the banknote therewith.

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

[0022] As the reading unit, a magnetic sensor that senses a magnetic pattern (magnetic features) of a banknote may be used as well as a sensor that senses an optical pattern (optical features) of a banknote.

[0023] The banknote storage 300 having a banknote storing part (a paper sheet storing part, not illustrated) therein is coupled to the banknote transport device 1. The banknote outlet 16 is communicated with a banknote receiving port (a paper sheet receiving port) 301 of the banknote storage 300. The banknote storage 300 stores banknotes received from the banknote transport device 1 in the banknote storing part through the banknote receiving port 301. The banknote storage 300 includes a driven gear 303 that meshes with the external output gear 150 to obtain drive force from the storage motor 110B. The banknote storage 300 obtains drive force from outside to move gears and the like included in the banknote storage 300 and stores banknotes in the banknote storing part.

[0024] The controller 200 is constituted of a unit including a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory), or is constituted of an MPU (Micro Processing Unit) or the like that has a necessary module in addition to the elements described above incorporated in one chip. The CPU reads a program from the ROM and loads the program into the RAM to execute the program, so that various functions and means are realized.

[0025] The configuration described above of the banknote transport device 1 is merely an example and various modifications may be applied. For example, various alterations or choices of components, such as the number of used motors, arrangement of roller pairs and transport belts, and the types of the reading units are possible.

[0026] <Motor unit> FIG. 3 is a side view of the motor unit. FIG. 4 is a perspective view of the motor unit. Basic configurations of the transport motor unit 100A and the storage motor unit 100B are same while arrangements of members thereof are partially different. Hereinafter, the transport motor unit 100A and the storage motor unit 100B are described without specific distinction therebetween.

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

[0028] <<Motor • pinion gear>> The motor 110 includes a substantially cylindrical housing 111 that houses a rotor and a stator and that has both end faces closed, and the motor shaft 113 that rotates integrally with the rotor and that has both end parts in the axial direction protruded from end faces 111a and 111b of the housing 111 in the axial direction. As one example, the housing 111 is configured to include a bottomed cylindrical motor case where one end face 111a in the axial direction is closed and the other end face 111b is open, and an end bell that closes the other end face of the motor case. The housing 111 is electrically conductive.

[0029] The pinion gear 115 is fixed to one end part 113a of the motor shaft 113 in the axial direction to rotate coaxially and integrally with the motor shaft 113. The pinion gear 115 is made of a resin and transmits drive force to gears, rollers, belts, or the like on the downstream side.

[0030] <<Encoder unit>> The encoder unit 120 includes the code wheel 121, an optical element (a rotation detector) 129 that detects teeth 125 (slits 127) of the code wheel 121, a processor 131 that processes an electric signal output from the optical element 129, and a motor substrate 133 on which the optical element 129 and the processor 131 are mounted.

[0031] The code wheel 121 is fixed to the other end part 113b of the motor shaft 113 in the axial direction and rotates coaxially and integrally with the motor shaft 113. The code wheel 121 includes a disk part 123 fixed to the motor shaft 113, and the teeth 125 (the slits 127) that are protruded along the axial direction of the motor shaft 113 from an outer circumferential part of the disk part 123 toward the motor 110 (toward the motor substrate 133) and that are arranged at predetermined intervals along the circumferential direction of the disk part 123. The teeth 125 and the slits 127 function as a scale that is read by the optical element 129 to detect rotation of the motor 110.

[0032] The motor substrate 133 is placed between the code wheel 121 and the motor 110. The motor substrate 133 is arranged in such a manner that the other end part 113b of the motor shaft 113 in the axial direction penetrates through the plane of the motor substrate and that one surface 133a faces the other end face 111b of the housing 111 in the axial direction with a predetermined interval therebetween. The code wheel 121 is fixed to the other end part 113b of the motor shaft 113 protruded from the side of the other surface 133b of the motor substrate 133.

[0033] The motor substrate 133 is located in parallel to the code wheel 121. The optical element 129 and the processor 131 are mounted on the other surface 133b of the motor substrate 133. The optical element 129 is a photointerrupter that includes a lightemitting element and a light-receiving element arranged to enable each of the teeth 125 (each of the slits 127) of the rotating code wheel 121 to be sequentially sandwiched therebetween. The processor 131 includes at least an output terminal that outputs an electric signal to outside. As the processor 131, an A / D converter, a signal processing IC, or the like may be included. A gap between the motor substrate 133 and the housing 111 prevents short circuit of various electric components via the housing 111 and solder or the like exposed on one surface 133a of the motor substrate 133.

[0034] Due to forming of the teeth 125 of the code wheel in a shape bent (folded at a right angle) from the disk part 123, the motor unit 100 can be easily assembled. Unitization (assembly) of the motor 110 and the encoder unit 120 enhances the maintenance performance related to components surrounding the motor. Furthermore, the motor unit 100 is configured to be compact.

[0035] <<Motor-side temperature sensor>> The motor-side temperature sensor 140 is mounted on the one surface 133a of the motor substrate 133. The motor-side temperature sensor 140 is, for example, a packaged temperature sensor IC. Since the motor-side temperature sensor 140 is arranged in the gap between the motor substrate 133 and the housing 111, the motor unit 100 and the banknote transport device 1 including the motor unit are not increased in the size.

[0036] The thermally conductive member 141 is placed between the motor-side temperature sensor 140 and the other end face 111b of the motor 110 in the axial direction. The thermally conductive member 141 is in close contact with both the motor 110 and the motor-side temperature sensor 140. The thermally conductive member 141 transmits heat of the housing 111 to the motor-side temperature sensor 140. The motorside temperature sensor 140 measures the temperature of an outer surface of the motor 110 via the thermally conductive member 141.

[0037] It is desirable that the thermally conductive member 141 covers the whole of the surface facing the motor 110 among the surfaces of the motor-side temperature sensor 140. The thermally conductive member 141 is set to a size substantially equal to the surface of the motor-side temperature sensor 140 or a larger size. While a thermally conductive sheet having softness or flexibility can be cited as an example of the thermally conductive member 141, the thermally conductive member is not limited thereto.

[0038] <<Arrangement of motor unit>> The motor units 100A and 100B are located below the transport route 10. The whole of each of the motor shafts 113 overlaps with the transport route 10 in the upper-lower direction. The motor units 100A and 100B are arranged below the reading units 20A and 20B. The motor units 100A and 100B are in a positional relation overlapping with at least a part of the reading units 20A and 20B in the upper-lower direction.

[0039] As illustrated in FIG. 1, the motor units 100A and 100B are arranged in such a manner that the motor shafts 113 extend in the longitudinal direction of the transport route 10 (the transport direction of banknotes). As illustrated in FIG. 2, the motor units 100A and 100B are arranged side by side in a width direction intersecting with (orthogonal to) the longitudinal direction of the transport route 10. A part of the motor shafts 113 that becomes the hottest in the motor 110 is in a positional relation overlapping with the reading units 20A and 20B in the upper-lower direction. Accordingly, particularly the lower reading unit 20A is likely to be heated by being exposed to heat rising from the two motors 110A and 110B.

[0040] <Functional configuration> FIG. 5 is a block diagram of the banknote transport device, illustrating a 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 input terminals of the controller 200. The transport motor 110A and the storage motor 110B are connected to output terminals of the controller 200. The controller 200 restricts the drive time of each of the transport motor 110A and the storage motor 110B according to temperatures of the parts detected by the temperature sensors 140 and 29.

[0041] <<Control example>> FIG. 6 is a diagram illustrating one example of a control method in a table. As indicated by control (1) in the table, when the motor-side temperature sensor 140 detects a temperature ta2 or a higher temperature, the controller 200 alternately repeats control to stop the motor 110 for x1 seconds and control to drive the motor 110 to transport one (n1) banknote until the motor-side temperature sensor 140 detects a temperature ta1 or a lower temperature. As indicated by control (2) in the table, when the motor-side temperature sensor 140 detects a temperature ta4 or a higher temperature, the controller 200 alternately repeats control to stop the motor 110 for x2 seconds and control to drive the motor 110 to transport one (n2) banknote until the motor-side temperature sensor 140 detects a temperature ta3 or a lower temperature.

[0042] As indicated by control (3) in the table, when the motor-side temperature sensor 140 detects a temperature ta6 or a higher temperature, the controller 200 executes control to stop the motor 110 until the motor-side temperature sensor 140 detects a temperature ta4 or a lower temperature. As indicated by control (4) in the table, when the reading-side temperature sensor 29 detects a temperature tb2 or a higher temperature, the controller 200 executes control to stop the motor 110 until the reading-side temperature sensor 29 detects a temperature tb1 or a lower temperature. The above temperatures hold a relation tb1<tb2<ta1<ta2<ta3<ta4<ta6, the times hold a relation xl<x2, and the numbers of banknotes hold a relation nl>n2.

[0043] The setting temperatures ta1 to ta6 are set to enable the pinion gear 115 to be protected. For example, the temperature ta2 is set to prevent the pinion gear 115 from having a temperature above the normal heatproof temperature. The temperature ta4 is set to prevent the pinion gear from having a temperature above the maximum operating temperature. The temperature ta6 is set to prevent the pinion gear from having a temperature above a softening temperature. However, it is difficult to directly detect the temperature of the pinion gear 115 or the motor shaft 113. Therefore, the setting temperatures ta1 to ta6 are set based on a correlation between the surface temperature of the motor 110 and the temperature of the pinion gear 115. The setting temperature tb2 is set to enable the reading unit 20 to be protected. The temperature tb2 is set to prevent the reading unit 20 from having a temperature above the upper limit of the allowable operating temperature.

[0044] FIGS. 7(a) and 7(b) are diagrams illustrating examples of temperature changes of the motor in a case where the control illustrated in FIG. 6 is executed, by graphs. FIG. 7(a) illustrates an example in a case where the control (1) and the control (2) are executed, and FIG. 7(b) illustrates an example in a case where only the control (1) is executed. P1 to P6 in FIG. 7(a) and Q1 to Q9 in FIG. 7(b) represent the numbers of passed banknotes.

[0045] In FIG. 7(a), the temperature of the motor rapidly increases until P1 banknotes have passed where any control is not executed. When the motor-side temperature sensor detects the temperature ta2, the control (1) is executed. Since the temperature of the motor does not become equal to or lower than the temperature ta1 after the control (1) is executed, the control (1) is repeatedly executed. The temperature of the motor continues to gradually increase while finely increasing and decreasing in association with the execution of the control (1). When the motor-side temperature sensor detects the temperature ta4, the control (2) is executed. Since the temperature of the motor becomes equal to or lower than the temperature ta3 by the execution of the control (2), the control (1) is executed. With the control (1) and the control (2) repeatedly executed in this way, the temperature of the motor fluctuates between the temperature ta2 and the temperature ta4 and is kept below the temperature ta6.

[0046] In FIG. 7(b), the temperature of the motor rapidly increases until Q1 banknotes have passed where any control is not executed. When the motor-side temperature sensor detects the temperature ta2, the control (1) is executed. Since the temperature of the motor becomes equal to or lower than the temperature ta1 by the execution of the control (1), the control (1) is canceled. When the motor-side temperature sensor detects again the temperature ta2 after the control (1) is canceled, the control (1) is executed. By this repetition of the executed state and the non-executed state of the control (1), the temperature of the motor increases and decreases. In this example, the motor keeps a temperature below the temperature ta6 without execution of the control (2).

[0047] [Summary of aspect examples, actions, and effects of present invention] <First aspect> A paper sheet transport device (a banknote transport device 1) according to the present aspect includes a transport route 10 on which paper sheets (banknotes P) are transported, a transport unit (transport roller pairs 14) that transports the paper sheets along the transport route, a reading unit 20 that has a reading sensor (a light-receiving element 25) reading a feature amount of each of the paper sheets transported on the transport route, a motor unit (a transport motor unit 100A) that has a motor (a transport motor 110A) driving the transport unit, and a controller 200 that executes driving control of the motor. The motor unit includes a motor-side temperature sensor 140 that measures a temperature of the motor, and a thermally conductive member 141 filled between the motor-side temperature sensor and the motor. The reading unit includes a reading-side temperature sensor 29 that measures a temperature in the reading unit.

[0048] The controller alternately repeats control to stop the motor for x1 seconds and control to drive the motor to transport n1 (one) of the paper sheets until the motor-side temperature sensor detects a temperature ta1 or a lower temperature, when the motorside temperature sensor detects a temperature ta2 or a higher temperature. The controller alternately repeats control to stop the motor for x2 seconds and control to drive the motor to transport n2 of the paper sheets until the motor-side temperature sensor detects a temperature ta3 or a lower temperature, when the motorside temperature sensor detects a temperature ta4 or a higher temperature. The controller executes control to stop the motor until the motor-side temperature sensor detects the temperature ta4 or a lower temperature, when the motorside temperature sensor detects a temperature ta6 or a higher temperature. The controller executes control to stop the motor until the reading-side temperature sensor detects a temperature tb1 or a lower temperature, when the readingside temperature sensor detects a temperature tb2 or a higher temperature. Note that the temperatures hold a relation tb1<tb2<ta1<ta2<ta3<ta4<ta6, and the times hold a relation x1<x2.

[0049] According to the present aspect, when the motor has a predetermined high temperature, the operation time of the motor is restricted to reduce heat generation of the motor. Therefore, occurrence of problems due to heat generation of the motor can be prevented.

[0050] <Second aspect> In the paper sheet transport device (the banknote transport device 1) according to the present aspect, the motor (the transport motor 110A) includes a housing 111 that houses a rotor, and a motor shaft 113 that rotates integrally with the rotor and that has both end parts 113a and 113b in an axial direction protruded from end faces 111a and 111b of the housing in an axial direction. The motor unit (the transport motor unit 100A) includes a motor substrate 133 through which another end part 113b of the motor shaft 113 in the axial direction penetrates within a plane thereof and that has one surface 133a arranged to face another end face 111b of the housing 111 in an axial direction with a predetermined interval away therefrom, a code wheel 121 that is fixed to another end part 113b of the motor shaft protruded toward a side of another surface 133b of the motor substrate and that has a scale (teeth 125, slits 127) formed along a circumferential direction, and a rotation detector (an optical element 129) that is mounted on a side of the another surface of the motor substrate to detect the scale of the code wheel. The motor-side temperature sensor is mounted on a side of one surface of the motor substrate.

[0051] The code wheel, the rotation detector, and the motor substrate constitute an encoder unit. The motor substrate is used as a destination on which the motor-side temperature sensor is mounted. There is a gap between the motor substrate and the housing, and various electric components are configured not to be short-circuited via the housing. The motor-side temperature sensor is, for example, a temperature sensor IC and is placed in the gap between the motor substrate and the housing. The thermally conductive member 141 is filled in the gap between the motor-side temperature sensor and the housing, and the motor-side temperature sensor detects the temperature of the motor via the thermally conductive member.

[0052] According to this aspect, since the motor, the encoder unit, and the temperature sensor are assembled as a unit, the maintenance performance is high and the motor unit is configured to be compact. Since the motor substrate is used to place the motor-side temperature sensor in the gap between the motor substrate and the housing, the device is not increased in the size.

[0053] <Third aspect> In the paper sheet transport device (the banknote transport device 1) according to the present aspect according to the present aspect, the motor (the transport motor 110A) is arranged below the reading unit in a positional relation overlapping with at least a part of the reading unit 20 in an upper-lower direction.

[0054] The reading unit has a risk of causing problems, such as distortion of a read image, when having a high temperature. In the present aspect, the reading unit is arranged above the motor being a heat-generating component and is in a positional relation likely to be affected by an increase in the temperature of the motor. According to this aspect, when the motor has a predetermined high temperature, the operation time of the motor is restricted to reduce heat generation of the motor, or the motor is stopped to prevent heat from being generated. Therefore, occurrence of problems due to overheat of the reading unit can be prevented.

[0055] <Fourth aspect> The paper sheet transport device (the banknote transport device 1) according to the present aspect according to the present aspect includes a second motor (a storage motor 110B) that is placed adjacent to the motor (the transport motor 110A) below the reading unit 20 and that outputs drive force to an external device (a banknote storage 300), and the second motor is in a positional relation overlapping with at least a part of the reading unit in an upper-lower direction.

[0056] The second motor functions as a drive source, for example, at a time when a banknote storage having no power performs a banknote storing operation. The reading unit is placed above two motors and is in a positional relation likely to be affected by an increase in the temperatures of these motors. According to this aspect, when the motor has a predetermined high temperature, the operation time of the motor is restricted to reduce heat generation of the motor, or the motor is stopped to prevent heat from being generated. Therefore, occurrence of problems due to overheat of the reading unit can be prevented.

[0057] <Fifth aspect> In the paper sheet transport device (the banknote transport device 1) according to the present aspect according to the present aspect, the code wheel 121 includes a disk part 123 that is arranged in parallel to the motor substrate 133, and a plurality of teeth 125 that are protruded along an axial direction of the motor shaft 113 from an outer circumferential part of the disk part toward the motor substrate and that are arranged at predetermined intervals along a circumferential direction of the disk part. The rotation detector (the optical element 129) is a photointerrupter that includes a light-emitting element and a light-receiving element arranged to sequentially sandwich each of the teeth of the code wheel that is rotating therebetween.

[0058] Due to forming of the teeth of the code wheel in a shape folded at a right angle with respect to the disk part, the motor unit can be easily assembled. Unitization (assembly) of the motor and the encoder unit enhances the maintenance performance related to components surrounding the motor. Furthermore, the motor unit is configured to be compact.

[0059] <Sixth aspect> In the paper sheet transport device (the banknote transport device 1) according to the present aspect according to the present aspect, the motor (the transport motor 110A) includes a housing 111 that houses a rotor, and a motor shaft 113 that rotates integrally with the rotor and that has both end parts 113a and 113b in an axial direction protruded from end faces 111a and 111b of the housing in an axial direction. A resin pinion gear 115 that transmits drive force to the transport unit (the transport roller pairs 14) is fixed to one end part 113a of the motor shaft in an axial direction. The temperature ta2 is set to prevent the pinion gear from having a temperature above a normal heatproof temperature. The temperature ta4 is set to prevent the pinion gear from having a temperature above a maximum operating temperature. The temperature ta6 is set to prevent the pinion gear from having a temperature above a softening temperature. The temperature tb2 is set to prevent the reading unit 20 from having a temperature above an upper limit of an allowable operating temperature.

[0060] The resin pinion gear has a risk of softening and becoming incapable of transmitting drive force when having a high temperature. The temperatures ta2, ta4, and ta6 are set to enable protection of the pinion gear. According to the present aspect, occurrence of problems such as softening of the pinion gear to cause idling can be prevented. The reading unit has a risk of causing problems, such as distortion of a read image, when having a high temperature. The temperature tb2 is set to enable protection of the reading unit. According to the present aspect, it is possible to prevent occurrence of problems such as distortion of a read image which leads to difficulty in properly recognizing a paper sheet being transported.

[0061] <Seventh aspect> The present aspect is a paper sheet handling device characterized in including the paper sheet transport device. The paper sheet handling device according to the present aspect receives the effects provided by the paper sheet transport device (the banknote transport device 1). Reference Signs List

[0062] P.banknote (paper sheet), 1...banknote transport device (paper sheet transport device), 3.lower unit, 4.upper unit, 10.transport route, 12.banknote inlet (paper sheet inlet), 14.transport roller pair (transport unit), 16.banknote outlet (paper sheet outlet), 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.storage motor unit, 110.motor, 110A.transport motor, 110B.storage motor (second motor), 111.housing, 111a.one end face, 111b.the other end face, 113.motor shaft, 113a.one end part, 113b.the other end part, 115.pinion gear, 120.encoder unit, 121.code wheel, 123.disk part, 125.teeth (scale), 127.slit (scale), 129.optical element (rotation detector), 131.processor, 133.motor substrate, 133a.one surface, 133b.the other surface, 140.motor-side temperature sensor, 140A.transport motor-side temperature sensor, 140B.storage motor-side temperature sensor, 141.thermally conductive member, 150.external output gear, 200.controller, 300.banknote storage (paper sheet storage, external device), 301.. .banknote receiving port (paper sheet receiving port), 303.. .driven gear

Claims

1. A paper sheet transport device comprising a transport route on which paper sheets are transported, a transport unit that transports the paper sheets along the transport route, a reading unit that has a reading sensor reading a feature amount of each of the paper sheets transported on the transport route, a motor unit that has a motor driving the transport unit, and a controller that executes driving control of the motor, whereinthe motor unit includes a motor-side temperature sensor that measures a temperature of the motor, and a thermally conductive member filled between the motorside temperature sensor and the motor,the reading unit includes a reading-side temperature sensor that measures a temperature in the reading unit, andthe controlleralternately repeats control to stop the motor for x1 seconds and control to drive the motor to transport n1 of the paper sheets until the motor-side temperature sensor detects a temperature ta1 or a lower temperature, when the motor-side temperature sensor detects a temperature ta2 or a higher temperature,alternately repeats control to stop the motor for x2 seconds and control to drive the motor to transport n2 of the paper sheets until the motor-side temperature sensor detects a temperature ta3 or a lower temperature, when the motor-side temperature sensor detects a temperature ta4 or a higher temperature,executes control to stop the motor until the motor-side temperature sensor detects the temperature ta4 or a lower temperature, when the motor-side temperature sensor detects a temperature ta6 or a higher temperature, andexecutes control to stop the motor until the reading-side temperature sensor detects a temperature tb1 or a lower temperature, when the reading-side temperature sensor detects a temperature tb2 or a higher temperature,where the temperatures hold a relation tb1<tb2<ta1<ta2<ta3<ta4<ta6, and the times hold a relation x1<x2.

2. The paper sheet transport device according to claim 1, whereinthe motor includes a housing that houses a rotor, and a motor shaft that rotatesintegrally with the rotor and that has both end parts in an axial direction protruded from end faces of the housing in an axial direction,the motor unit includes a motor substrate through which another end part of the motor shaft in the axial direction penetrates within a plane thereof and that has one surface arranged to face another end face of the housing in an axial direction with a predetermined interval away therefrom, a code wheel that is fixed to another end part of the motor shaft protruded toward a side of another surface of the motor substrate and that has a scale formed along a circumferential direction, and a rotation detector that is mounted on a side of another surface of the motor substrate to detect the scale of the code wheel, andthe motor-side temperature sensor is mounted on a side of one surface of the motor substrate.

3. The paper sheet transport device according to claim 2, wherein the motor is arranged below the reading unit in a positional relation overlapping with at least a part of the reading unit in an upper-lower direction.

4. The paper sheet transport device according to claim 3, including a second motor that is placed adjacent to the motor below the reading unit and that outputs drive force to an external device, whereinthe second motor is in a positional relation overlapping with at least a part of the reading unit in an upper-lower direction.

5. The paper sheet transport device according to claim 2, whereinthe code wheel includes a disk part that is arranged in parallel to the motor substrate, and a plurality of teeth that are protruded along an axial direction of the motor shaft from an outer circumferential part of the disk part toward the motor substrate and that are arranged at predetermined intervals along a circumferential direction of the disk part, andthe rotation detector is a photointerrupter that includes a light-emitting element and a light-receiving element arranged to sequentially sandwich each of the teeth of the code wheel that is rotating therebetween.

6. The paper sheet transport device according to claim 1, whereinthe motor includes a housing that houses a rotor, and a motor shaft that rotatesintegrally with the rotor and that has both end parts in an axial direction protruded from5 end faces of the housing in an axial direction,a resin pinion gear that transmits drive force to the transport unit is fixed to one end part of the motor shaft in an axial direction,the temperature ta2 is set to prevent the pinion gear from having a temperature above a normal heatproof temperature,10          the temperature ta4 is set to prevent the pinion gear from having a temperatureabove a maximum operating temperature,the temperature ta6 is set to prevent the pinion gear from having a temperature above a softening temperature, andthe temperature tb2 is set to prevent the reading unit from having a temperature15 above an upper limit of an allowable operating temperature.

7. A paper sheet handling device comprising the paper sheet transport deviceaccording to any one of claims 1 to 6.

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