Abstract:
A clutch device may include; a first rotor body; a second rotor body engageable with the first rotor body; a clutch drive motor connected with a first drive line and a second drive line; a clutch mechanism; a first switch comprising first and second contact point electrodes; a second switch comprising first and second contact point electrodes; a first terminal electrically connected with of the first contact point electrode of the first switch; a second terminal electrically connected with the first drive line; a third terminal electrically connected with the first contact point electrode of the second switch; and a fourth terminal electrically connecting with the second drive line. The second contact point electrode of the first switch and the second contact point electrode of the second switch may be electrically connected with the second drive line.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This is the U.S. national stage of application No. PCT/JP2014/079517, filed on Nov. 7, 2014. Priority under 35 U.S.C. §119(a) and 35 U.S.C. §365(b) is claimed from Japanese Application No. 2013-235965, filed Nov. 14, 2013, the disclosure of which is incorporated herein by reference. 
     
    
     FIELD OF THE INVENTION 
       [0002]    At least an embodiment of the present invention relates to a clutch device structured to connect and disconnect transmission of a rotation drive force from a motor to a washing tub and to a washing machine on which the clutch device is mounted. 
       BACKGROUND 
       [0003]    A washing machine including a clutch device on the way of a power transmission path for transmitting a rotation drive force of a motor to a washing tub is described in Patent Literature 1. In the clutch device described in Patent Literature 1, a clutch lever is moved up and down by a cam body turned by a drive motor and thereby the clutch device is switched between a state that a rotation drive force is transmitted and a state that the transmission of the rotation drive force is cut off in the clutch device. The cam body which is turned by the drive motor is provided with a contact-point cam structured to make a three-contact type switch on and off. Protrusions and recesses are formed on an outer peripheral face of the contact-point cam and an on/off state of contact points “a” and “b” of the three-contact type switch is switched every time the contact-point cam is turned by 180 degrees. 
         [0004]    In the washing machine described in Patent Literature 1, connecting and disconnecting of a rotation drive force by the clutch device is switched by controlling driving of the drive motor based on OFF signals of the contact points “a” and “b” and washing and dewatering are performed. Further, the washing machine in Patent Literature 1 is structured so that a position of a valve body provided in a drainage valve of a washing tub is switched by the clutch device and drainage in the washing tub and rotation of the washing tub are performed by interlocking the common drive motor, the cam and the three-contact type switch with each other. 
       CITATION LIST 
       [0005]    [PTL 1] Japanese Patent Laid-Open No. 2004-225734 
         [0006]    In the washing machine described in Patent Literature 1, a switch element is provided in a circuit which connects the drive motor with a power supply and the switch element is controlled based on OFF signals of the contact points “a” and “b” to perform connecting and disconnecting of the clutch. Specifically, the contact points “a” and “b” are alternately set to be “off” states only for a short time each time the contact-point cam is turned by 180 degrees. The drive motor is stopped based on an OFF signal of the contact point “a” and thereby the clutch device is switched to a state that rotation is not transmitted to the washing tub and the valve body of the drainage valve is held at a closing position and washing is performed. Further, when the drive motor is stopped based on an OFF signal of the contact point “b”, the clutch device is switched to a state that rotation is transmitted to the washing tub and the valve body of the drainage valve is held at an open position and dewatering is performed. 
         [0007]    However, in the structure described in Patent Literature 1, in order to control power feeding to the drive motor of the clutch device, a microcomputer mounted on the washing machine is required to supply a control signal for the drive motor based on a signal from the three-contact type switch. Therefore, this structure is unable to cope with a system in which the drive motor of the clutch device is directly controlled by a switch which is mechanically set on and off interlocked with connecting and disconnecting states of the clutch device. 
       SUMMARY 
       [0008]    In view of the problem described above, at least an embodiment of the present invention provides a highly versatile clutch device which can be used both in a structure that control of a motor for driving a clutch device is directly performed by a switch which is opened and closed interlocking with connecting and disconnecting states of the clutch device and a structure that control of the motor for driving the clutch device is performed through a signal from an external control circuit. Further, at least an embodiment of the present invention is to provide a washing machine which comprises the clutch device. 
         [0009]    In order to attain the above, at least an embodiment of the present invention provides a clutch device structured to connect and disconnect transmission of a rotation drive force from a motor to a washing tub. The clutch device includes a first rotor body to which the rotation drive force of the motor is transmitted, a second rotor body which is engageable with the first rotor body, a clutch drive motor which is connected with a first drive line and a second drive line and is structured to be rotated by electric power supplied through the first drive line and the second drive line, a clutch mechanism which is driven by the clutch drive motor to perform switching between a connecting state where the rotation drive force is transmitted from the first rotor body to the second rotor body and a disconnecting state where the connecting state is released, a first switch which is switched from an “ON” state to an “OFF” state when switched from the connecting state to the disconnecting state, a second switch which is switched from an “ON” state to an “OFF” state when switched from the disconnecting state to the connecting state, a first terminal which is electrically connected with one of contact point electrodes of the first switch, a second terminal which is electrically connected with the first drive line, a third terminal which is electrically connected with one of contact point electrodes of the second switch, and a fourth terminal which is capable of electrically connecting with the second drive line. The other of the contact point electrodes of the first switch and the other of the contact point electrodes of the second switch are electrically connected with the second drive line. 
         [0010]    In at least an embodiment of the present invention, a clutch mechanism is provided which is driven by a clutch drive motor, and two switches are provided which are mechanically opened and closed interlocked with connection and disconnection of the clutch mechanism, in other words, a first switch is provided which is switched from an “ON” state to an “OFF” state when the clutch mechanism is switched to a state where a drive force is transmitted, and a second switch is provided which is switched from an “ON” state to an “OFF” state when switched to a state where the drive force is not transmitted. Further, four terminals are provided, in other words, a first terminal connected with a contact point electrode of the first switch, a third terminal connected with a contact point electrode of the second switch, and a second and a fourth terminals connected with a first and a second drive lines for supplying electric power to the clutch drive motor. According to this structure, two switches are capable of being connected with a power feeding circuit for the clutch drive motor and thus the clutch drive motor can be directly driven and controlled depending on connecting and disconnecting states of the clutch mechanism. Further, signals from two switches can be outputted to an external control circuit and thus the clutch drive motor can be also driven and controlled by a control signal from the external control circuit. Therefore, various drive control systems can be utilized and its versatility is high. 
         [0011]    In at least an embodiment of the present invention, it is desirable that the clutch mechanism includes a rotation member which is driven by the clutch drive motor, and a swing member which is structured to be reciprocatedly swung over a constant angular range based on rotation of the rotation member to move the second rotor body between a connecting position where the second rotor body is engaged with the first rotor body and a disconnecting position where engagement of the second rotor body with the first rotor body is released. The first rotor body and the second rotor body are coaxially disposed so as to be superposed on each other in an axial line direction of the washing tub, and the swing member is overlapped with the second rotor body in the axial line direction and is disposed so as to swing with a swing center line coincided with rotation center lines of the first rotor body and the second body as a center. The swing member is formed on one side in the axial line direction with a plurality of first cam faces of a cam mechanism structured to move the second rotor body in a direction approached to and separated from the first rotor body, and the plurality of the first cam faces is disposed with equal angular intervals with the swing center line as a center. In at least an embodiment of the present invention, as described above, the clutch drive motor can be driven depending on an actual state of the clutch mechanism by using the switches which are turned to an “OFF” state at a connecting position and a disconnecting position of the clutch mechanism. Therefore, the second rotor body can be accurately positioned at an engaging position with the first rotor body (clutch connecting position) and a position separated from the first rotor body (clutch disconnecting position). Accordingly, a required moving space of the second rotor body can be minimized and a dimension of the clutch device can be made small in a direction along the axial line direction of the washing tub. As a result, a washing machine in which a device dimension in the axial line direction of the washing tub is small can be realized. Further, cam faces of a cam mechanism for making the second rotor body approach to and separate from the first rotor body are disposed equally in a circumferential direction with a rotation center line of the second rotor body as a center and thus the swing member and the second rotor body can be moved in the axial line direction without being inclined. Therefore, connection and disconnection of the clutch mechanism can be performed with a high degree of accuracy. 
         [0012]    In at least an embodiment of the present invention, it is desirable that the swing member is structured so that the swing member is reciprocatedly swung over the constant angular range by being moved by an eccentric pin provided in the rotation member and thereby the swing member is moved in the axial line direction between the connecting position and the disconnecting position, the eccentric pin is passed through a first rotation position and a second rotation position in tangential directions parallel to an imaginary line which is formed by connecting a rotation center of the rotation member and a swing center of the swing member and, when the eccentric pin is passed one of the first rotation position and the second rotation position, the swing member is moved to the connecting position and, when passing the other, the swing member is moved to the disconnecting position. According to this structure, a moving amount (swing angle) of the swing member for a turning angle of the rotation member is small at the connecting position, the disconnecting position and the vicinities of the positions of the clutch mechanism. Therefore, the clutch mechanism can be driven and controlled with a high degree of accuracy at the connecting position, the disconnecting position and the vicinities of the positions of the clutch mechanism and the clutch drive motor can be surely stopped at the connecting position and the disconnecting position of the clutch mechanism. 
         [0013]    In this case, it is desirable that the clutch mechanism includes a second cam face facing the first cam face, and the second cam face is formed with a connecting position holding cam face which is extended in a circumferential direction so that its normal direction is directed in a direction parallel to the axial line and which holds the second rotor body at the connecting position, and a disconnecting position holding cam face which is extended in the circumferential direction so that its normal direction is directed in a direction parallel to the axial line and which holds the second rotor body at the disconnecting position. According to this structure, the second rotor body can be held in a state that the second rotor body is not moved in a connecting and disconnecting direction of the clutch mechanism by the connecting position holding cam face and the disconnecting position holding cam face. Therefore, even when rattling is occurred in the clutch mechanism or in the members of the first and the second switches, the clutch device can be set in the connected and the disconnected states. 
         [0014]    In at least an embodiment of the present invention, it is desirable that the clutch device includes a rotation cam which is rotationally driven by the clutch drive motor, a first movable plate which structures one of one contact point electrode and the other contact point electrode of the first switch and which contacts with a cam face of the rotation cam in an urged state toward the cam face, and a second movable plate which structures one of one contact point electrode and the other contact point electrode of the second switch and which contacts with the cam face in an urged state toward the cam face, and a first inclined face of the cam face for moving the first movable plate and the second movable plate from an “ON” position to an “OFF” position is steeper in inclination than a second inclined face for moving the first movable plate and the second movable plate from the “OFF” position to the “ON” position. According to this structure, when the switch is turned to an “OFF” state, the contact point electrode is rapidly separated and thus the contact point electrode can be suppressed from being an unstable contact state. Therefore, chattering of a power supply for the clutch drive motor can be suppressed. 
         [0015]    Next, a washing machine in accordance with at least an embodiment of the present invention includes the above-mentioned clutch device, a washing tub which is integrally rotated with the second rotor body, and a pulsator which is integrally rotated with the first rotor body in an inside of the washing tub. 
         [0016]    The washing machine in accordance with at least an embodiment of the present invention includes a first power feeding circuit which supplies electric power to the clutch drive motor through the first terminal and the second terminal when the first switch is set in an “ON” state, and a second power feeding circuit which supplies electric power to the clutch drive motor through the second terminal and the third terminal when the second switch is set in an “ON” state. According to this structure, the clutch drive motor can be directly driven and controlled depending on the connecting and disconnecting state of the clutch mechanism. 
         [0017]    Alternatively, a washing machine in accordance with at least an embodiment of the present invention includes a power feeding circuit which supplies electric power to the clutch drive motor through the second terminal and the fourth terminal, and a control section which controls supply of electric power from the power feeding circuit based on an electric potential of the first terminal and an electric potential of the second terminal. According to this structure, the clutch drive motor can be driven and controlled by a control signal from the control section. 
         [0018]    According to the clutch device in accordance with at least an embodiment of the present invention, four terminals are provided, in other words, the second and the fourth terminals connected with a first and a second drive lines for supplying electric power to the clutch drive motor and the first and the third terminals connected with contact point electrodes of two switches which are mechanically opened and closed interlocked with connection and disconnection of the clutch mechanism are provided. Therefore, two switches are capable of being connected with a power feeding circuit for the clutch drive motor and thus the clutch drive motor can be directly driven and controlled depending on a connecting and disconnecting state of the clutch mechanism. Further, signals from two switches can be outputted to an external control circuit and thus the clutch drive motor can be driven and controlled by a control signal from the external control circuit. Therefore, various drive control systems can be utilized and its versatility is high. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    Embodiments will now be described, by way of example only, with reference to the accompanying drawings which are meant to be exemplary, not limiting, and wherein like elements are numbered alike in several Figures, in which: 
           [0020]    [ FIG. 1 ] 
           [0021]      FIG. 1  is a longitudinal sectional view showing a schematic structure of a washing machine in accordance with an embodiment of the present invention. 
           [0022]    [ FIG. 2 ] 
           [0023]      FIG. 2  is an exploded perspective view showing a main part of a drive force transmission mechanism. 
           [0024]    [ FIG. 3 ] 
           [0025]      FIG. 3  is an exploded perspective view showing a clutch device which is viewed from an oblique lower side. 
           [0026]    [ FIG. 4 ] 
           [0027]      FIG. 4  is an exploded perspective view showing a clutch device which is viewed from an obliquely upper side. 
           [0028]    [ FIG. 5 ] 
           [0029]      FIGS. 5A and 5B  are perspective views showing connecting and disconnecting states of a clutch device. 
           [0030]    [ FIG. 6 ] 
           [0031]      FIGS. 6A and 6B  are side views showing connecting and disconnecting states of a clutch device. 
           [0032]    [ FIG. 7 ] 
           [0033]      FIGS. 7A and 7B  are explanatory views showing a clutch device from which a main frame, a motor case and a cover frame are detached. 
           [0034]    [ FIG. 8 ] 
           [0035]      FIG. 8  is a plan view showing a clutch device from which a cover frame is detached and which is viewed from a lower side. 
           [0036]    [ FIG. 9 ] 
           [0037]      FIGS. 9A, 9B and 9C  are explanatory views showing a first switch, a second switch and a switch opening and closing member. 
           [0038]    [ FIG. 10 ] 
           [0039]      FIGS. 10A and 10B  are explanatory views showing drive embodiments for a clutch device. 
           [0040]    [ FIG. 11 ] FIGS. 11A, 11B and 11C  are explanatory views showing states of a first and a second switches and power feeding states to a power feeding circuit when a clutch device is switched from a connecting state to a disconnecting state in a first drive embodiment. 
           [0041]    [ FIG. 12 ] 
           [0042]      FIGS. 12A, 12B and 12C  are explanatory views showing states of a first and a second switches and power feeding states to a power feeding circuit when a clutch device is switched from a disconnecting state to a connecting state in a first drive embodiment. 
           [0043]    [ FIG. 13 ] 
           [0044]      FIG. 13  is an explanatory view showing a rotation cam in a modified example. 
       
    
    
     DETAILED DESCRIPTION 
       [0045]    An embodiment of the present invention will be described below with reference to the accompanying drawings. In the following descriptions, a structure of a clutch device will be easily understood when it is described in a state that the clutch device mounted on a washing machine is viewed from a lower side. Therefore, in the following descriptions, a rotating direction is shown, for convenience, in a “clockwise direction CW” and a “counterclockwise direction CCW” viewed from a lower side in a state that the clutch device is mounted on a washing machine. 
       (Entire Structure) 
       [0046]      FIG. 1  is a longitudinal sectional view showing a schematic structure of a washing machine in accordance with an embodiment of the present invention. As shown in  FIG. 1 , a washing machine  1  includes a main body frame  2 . The main body frame  2  is provided with an opening part  2   a  for putting in and taking out laundry such as clothes on its upper face. The main body frame  2  is formed in a rectangular tube shape and its under face is opened. A washing tub  3  formed in a bottomed tube shape is accommodated in an inside of the main body frame  2  so that its opening part  3   a  is directed toward an upper side. The washing tub  3  is hanged by the main body frame  2  through a buffer member not shown and is held in a rotatable state around an axial line “L”. A pulsator  4  is disposed in a bottom portion on an inner side of the washing tub  3 . 
         [0047]    A motor  5  is disposed to a lower side of the washing tub  3 . A rotation drive force of the motor  5  is transmitted to the washing tub  3  and the pulsator  4  through a drive force transmission mechanism  6 . The drive force transmission mechanism  6  includes a clutch device  10  structured to connect and disconnect transmission of a rotation drive force of the motor  5  to the washing tub  3  on the way of a power transmission path from the motor  5  to the washing tub  3 . 
         [0048]    When the washing machine  1  is operated in a state that clothes have been put into the washing tub  3  through the opening part  2   a  of the main body frame  2 , washing water is supplied to the washing tub  3  through a water supply pipe not shown. After that, the motor  5  is driven to rotate the pulsator  4  and washing of clothes in the washing tub  3  is performed. In a washing operation when clothes are washed, the clutch device  10  is set in a disconnecting state that transmission of a rotation drive force of the motor  5  to the washing tub  3  is disconnected. Therefore, the washing tub  3  is set in a stopped state. 
         [0049]    When washing operation is finished and washing water is drained from the washing tub  3 , a dewatering operation for dewatering clothes is performed. In the dewatering operation, the clutch device  10  is set in a connecting state that a rotation drive force of the motor  5  is transmitted to the washing tub  3  and, in this state, the motor  5  is driven. As a result, the pulsator  4  and the washing tub  3  are integrally rotated and thus the clothes in the washing tub  3  are also turned together with the washing tub  3  and the pulsator  4 . Therefore, the clothes are dewatered by a centrifugal force. 
       (Drive Force Transmission Mechanism) 
       [0050]      FIG. 2  is an exploded perspective view showing a main part of the drive force transmission mechanism  6 . Further,  FIGS. 3 and 4  are exploded perspective views showing the clutch device  10  in which a first rotor body is not shown.  FIG. 3  is an exploded perspective view when viewed from an obliquely lower side (first rotor body  13  side) and  FIG. 4  is an exploded perspective view when viewed from an obliquely upper side (connection member  15  side). As shown in  FIGS. 1 and 2 , the drive force transmission mechanism  6  includes the clutch device  10 , a shaft member  14  coaxially disposed with the first rotor body  13  and a second rotor body  20  of the clutch device  10 , and a connection member  15  coaxially connected with a lower end portion of the washing tub  3 . 
         [0051]    The clutch device  10  includes the first rotor body  13  to which a rotation drive force of an output shaft  11  of the motor  5  is transmitted through an endless belt  12  (see  FIG. 1 ) and the second rotor body  20  which is disposed so as to be superposed on the first rotor body  13  in an axial line “L” direction of the washing tub  3 . The first rotor body  13  is formed in a disk shape and is coaxially disposed with the washing tub  3  to a lower side of the washing tub  3 . A circular outer peripheral face of the first rotor body  13  is an attaching face  13   a  to which the endless belt  12  is attached. Further, a center portion of an upper end face of the first rotor body  13  is formed with a teeth part not shown. The teeth part faces a teeth part  21  provided on a lower end face of a lower side portion  20 A (see  FIG. 3 ) of the second rotor body  20  and is formed in a shape so as to be engaged with the teeth part  21 . Each of the teeth part of the first rotor body  13  and the teeth part  21  of the second rotor body  20  is formed in a shape so that a plurality of projections extended in a radial direction is arranged with equal angular intervals in a circular ring shape. 
         [0052]    The shaft member  14  includes an outer shaft member  16  formed in a tube shape and a rotation shaft  17  which is disposed on an inner side of the outer shaft member  16 . A lower end portion of the rotation shaft  17  is, as shown in  FIG. 1 , connected with the first rotor body  13 , and its upper end portion is penetrated through a bottom part of the washing tub  3  and connected with the pulsator  4 . Therefore, a rotation drive force of the motor  5  is transmitted to the pulsator  4  through the endless belt  12 , the first rotor body  13  and the rotation shaft  17 . In other words, a power transmission path including the endless belt  12 , the first rotor body  13  and the rotation shaft  17  is structured between the motor  5  and the pulsator  4 . 
         [0053]    In this embodiment, the outer shaft member  16  is relatively rotatable to the rotation shaft  17  and the outer shaft member  16  and the first rotor body  13  are not connected with each other. On the other hand, a connection member  15  is attached to an outer peripheral side of the outer shaft member  16  and the outer shaft member  16  and the connection member  15  are integrally rotated with each other. 
         [0054]    The connection member  15  is, as shown in  FIG. 2 , provided with a large diameter flange part  18  connected with the washing tub  3  and a small diameter tube part  19  whose diameter is smaller than that of the large diameter flange part  18 . The small diameter tube part  19  is protruded to a lower side from the large diameter flange part  18 . The shaft member  14  is inserted into an inner side of the small diameter tube part  19 . The outer shaft member  16  of the shaft member  14  is connected with the small diameter tube part  19  so as to rotate together with the connection member  15 . The second rotor body  20  is coaxially attached to an outer peripheral side of a lower side portion of the small diameter tube part  19 . 
         [0055]    A lower side portion  20 A of the second rotor body  20  is formed with a penetration part  22  to which a lower side portion of the small diameter tube part  19  is attached. An inner peripheral face of the penetration part  22  is formed with a plurality of longitudinal grooves  26   a  and an outer peripheral face of the small diameter tube part  19  is formed with a plurality of projections  26   b.  The second rotor body  20  is connected with the connection member  15  in a state relatively movable in the axial line “L” direction with respect to the connection member  15  and in a state integrally rotatable with the connection member  15  by a spline  26  structured of the longitudinal grooves  26   a  and the projections  26   b.  In other words, the second rotor body  20  is integrally and rotatably connected with the washing tub  3  through the connection member  15 . 
         [0056]    When the second rotor body  20  is moved to a lower side (first rotor body  13  side) along the axial line “L” of the washing tub  3 , the teeth part  21  and the teeth part of the first rotor body  13  side are engaged with each other. When the second rotor body  20  and the first rotor body  13  are engaged with each other, the second rotor body  20  is integrally rotated with the first rotor body  13  in a coaxial state. As a result, a rotation drive force of the motor  5  is transmitted to the washing tub  3  through the endless belt  12 , the first rotor body  13 , the second rotor body  20  and the connection member  15 . In other words, a power transmission path having the endless belt  12 , the first rotor body  13 , the second rotor body  20  and the connection member  15  is provided between the motor  5  and the washing tub  3 . 
         [0057]    The clutch device  10  includes a main frame  30  attached from an under face side to a support plate  9  which is disposed at a predetermined position to a lower side of the washing tub  3 . The support plate  9  is hanged from the main body frame  2  together with the washing tub  3  through a buffer member not shown. The clutch device  10  is supported by the main body frame  2  through the support plate  9 . 
         [0058]    As shown in  FIG. 2 , the support plate  9  is provided with a ring-shaped protruded part  9   b  which is protruded to a lower side. A center portion of the ring-shaped protruded part  9   b  is provided with a through-hole  9   a  through which the small diameter tube part  19  of the connection member  15  is penetrated in the axial line “L” direction. The ring-shaped protruded part  9   b  is penetrated through a through-hole  30   a  (see  FIG. 4 ) provided in a rotor body mounting part  30 A of a main frame  30  of the clutch device  10  and is protruded to a lower side. A lower end portion of the ring-shaped protruded part  9   b  is inserted into an inner side of an upper side portion of the second rotor body  20 . Further, the main frame  30  is provided with a mechanism mounting part  30 B which is protruded to an outer side in a radial direction from the rotor body mounting part  30 A. A motor case  31  is fixed to the mechanism mounting part  30 B. The motor case  31  structures a motor accommodation part which accommodates a synchronous motor  37  (clutch drive motor) described below and a gear train  63  (see  FIGS. 7A and 7B ). 
         [0059]    As shown in  FIG. 1 , a compression coil spring  28  is provided on a lower side of a lower end face of the ring-shaped protruded part  9   b.  The compression coil spring  28  is disposed between a lower end face of the ring-shaped protruded part  9   b  and an upward face  23  (see  FIG. 4 ) which is formed on an inner side of an upper side portion of the second rotor body  20 . The compression coil spring  28  urges the second rotor body  20  to a lower side (direction toward the first rotor body  13 ). In addition, a ring-shaped bearing  29  is disposed on an inner side of the ring-shaped protruded part  9   b  of the support plate  9 . The washing tub  3  is rotatably supported through the connection member  15  by using the bearing  29 . 
       (Clutch Device) 
       [0060]    Next, the clutch device  10  will be described below with reference to  FIG. 3  through  FIG. 8 .  FIGS. 5A and 5B  are perspective views showing connecting and disconnecting states of the clutch device  10 .  FIGS. 6A and 6B  are side views showing connecting and disconnecting states of the clutch device  10 .  FIGS. 5A and 6A  are views showing connecting states in which a drive force of the motor  5  is transmitted.  FIGS. 5B and 6B  are views showing disconnecting states in which a drive force of the motor  5  is not transmitted. Further, in  FIGS. 5A and 5B  and  FIGS. 6A and 6B , the first rotor body  13  is not shown and, in  FIGS. 6A and 6B , a cover frame is shown by the broken line 
         [0061]    The clutch device  10  includes the first rotor body  13  and the second rotor body  20  described above, a clutch mechanism  33 , and a synchronous motor  37  (clutch drive motor) structured to drive the clutch mechanism  33 . The clutch mechanism  33  is switched between a connecting state in which a rotation drive force is transmitted from the first rotor body  13  to the second rotor body  20  and a disconnecting state in which the connecting state is released. The clutch mechanism  33  moves the second rotor body  20  in the axial line “L” direction when a connecting state and a disconnecting state are to be switched. Further, the clutch device  10  includes a first switch “A” which is switched from an “ON” state to an “OFF” state when the clutch mechanism  33  is switched from the connecting state to the disconnecting state, a second switch “B” which is switched from an “ON” state to an “OFF” state when the clutch mechanism  33  is switched from the disconnecting state to the connecting state, and a terminal part  44  in which terminals connected with contact points of the first switch “A” and the second switch “B” are disposed. The terminal part  44  is formed in the mechanism mounting part  30 B of the main frame  30 . 
         [0062]    The clutch mechanism  33  includes a swing member  34  which rotatably supports the second rotor body  20 , a cover frame  36  which supports the swing member  34  in a state movable in the axial line “L” direction and in a reciprocatedly swingable state around the axial line “L”, and a rotation member  61  which is turned by a synchronous motor  37  in one direction. Further, the clutch mechanism  33  includes a conversion mechanism  38  (rotation—swing conversion mechanism) by which rotation in one direction (clockwise direction CW around the rotation center shaft “L 1 ”) of the rotation member  61  is converted to a reciprocating swing of the swing member  34  (reciprocating swing in a clockwise direction CW and a counterclockwise direction CCW around the axial line “L”), and a cam mechanism  39  which reciprocatedly moves the swing member  34  in the axial line “L” direction interlocked with the reciprocating swing of the swing member  34 . 
         [0063]    The swing member  34  is, as shown in  FIGS. 3 and 4 , provided with a ring-shaped part  45  and a lever part  46  which is protruded to an outer peripheral side from the ring-shaped part  45 . A lower side portion  20 A of the second rotor body  20  is inserted to an inner side of the ring-shaped part  45 , and a flange  25  formed on an outer peripheral face of an upper end of the lower side portion  20 A is contacted with the swing member  34  in a state that the flange  25  is placed on an upper face of the ring-shaped part  45 . A first cam part  47  structuring a cam mechanism  39  is provided on an under face of the ring-shaped part  45  at three positions separated from each other with equal angular intervals. Each of the first cam parts  47  is a protruded part which is protruded toward a lower side and is provided with an inclined face  47   a,  which is inclined to a lower side as going to one side in a circumferential direction, and a flat lower end face  47   b  which is extended from a lower end of the inclined face  47   a  in a direction perpendicular to the axial line “L”. The inclined face  47   a  and the lower end face  47   b  structure a first cam face of the cam mechanism  39 . The lever part  46  is formed with an elongated hole  48  structuring the conversion mechanism  38 . The elongated hole  48  is a straight-shaped elongated hole and is extended long in a protruding direction of the lever part  46  (direction away from the center of the axial line “L”). 
         [0064]    The cover frame  36  is formed in a shape in which a large diameter part  36   a  and a small diameter part  36   b  in cylindrical shapes are connected with each other in an upper and lower direction. The cover frame  36  is fixed to a lower side of the rotor body mounting part  30 A of the main frame  30  coaxially with the through-hole  30   a  with the axial line “L” as a center. The cover frame  36  covers the lower side portion  20 A of the second rotor body  20  and the ring-shaped part  45  of the swing member  34  from an outer peripheral side. As shown in  FIG. 4 , an inner face of the cover frame  36  is formed with a step face  56  facing upward at a connection part of the large diameter part  36   a  with the small diameter part  36   b.  The step face  56  is a circular ring-shaped face with the axial line “L” as a center and the ring-shaped part  45  of the swing member  34  is disposed above the step face  56 . 
         [0065]    The large diameter part  36   a  of the cover frame  36  is formed with a cut-out part  36   c  which is formed by cutting out its portion in a circumferential direction from an upper side. The swing member  34  is placed on the step face  56  from an upper side in a state that the lever part  46  is protruded from the cut-out part  36   c  toward the mechanism mounting part  30 B. The step face  56  is formed with a second cam face  58  at three positions with equal angular intervals so as to be capable of sliding on the first cam face (the inclined face  47   a  and the lower end face  47   b ) of the first cam part  47  provided in the swing member  34 . The second cam face  58  is provided with a first cam face portion  58   a  in a flat face, which is an upper end face of the second cam part  59  that is a protruded part protruding to an upper side from an upper face of the step face  56 , a second cam face portion  58   b  in an inclined face, which is a side face on one side in the circumferential direction of the second cam part  59 , and a third cam face portion  58   c  in a flat face which is an upper face of the step face  56  and is extended from a lower end of the second cam face portion  58   b.    
         [0066]    The cam mechanism  39  is structured of the first cam face (the inclined face  47   a  and the lower end face  47   b ) which is an end face of the first cam part  47  formed in the swing member  34  and the second cam face  58  which is an end face of the second cam part  59  formed in the cover frame  36 . The inclined face  47   a  of the first cam face and the second cam face portion  58   b  of the second cam face  58  are inclined to a lower side as going to one side in the circumferential direction (clockwise direction CW with the axial line “L” as a center). Further, in the second cam face  58 , the first cam face portion  58   a  and the third cam face portion  58   c  are formed in flat faces which are extended in the circumferential direction so that their normal directions are directed to a parallel direction to the axial line “L”. In accordance with an embodiment of the present invention, the cam mechanism  39  is not limited to a cam mechanism utilizing an end face shape of a cylindrical tube member as described above, but various well-known cam shapes may be used. 
         [0067]    The conversion mechanism  38  includes the elongated hole  48  as an engaging part which is provided in the lever part  46  of the swing member  34  and the rotation member  61  which is connected with an output shaft of the synchronous motor  37  through a gear train  63 . The rotation member  61  is formed with an eccentric pin  60  in a column shape which is engaged with the elongated hole  48  in a state slidable in the elongated hole  48 . The rotation member  61  is rotatably attached at a position on the rotor body mounting part  30 A side in the mechanism mounting part  30 B of the main frame  30  so as to be rotatable around the rotation center axis “L 1 ” which is parallel to the axial line “L”. 
         [0068]      FIG. 7A  is a side view showing the clutch device  10  from which the main frame  30 , the motor case  31  and the cover frame  36  are detached.  FIG. 7B  is a plan view showing a synchronous motor and a gear train of the clutch device  10  which are viewed from a lower side. A rotation drive force of the synchronous motor  37  disposed in an inside of the motor case  31  is transmitted to the rotation member  61  through a gear train  63  which is disposed in the inside of the motor case  31  together with the synchronous motor  37 . The synchronous motor  37  in this embodiment is an AC synchronous motor and its rotating direction is restricted in one direction. 
         [0069]    As shown in  FIG. 7B , a pinion  37   a  is attached to an output shaft of the synchronous motor  37 . The gear train  63  includes a first gear  63   a  having a large diameter gear part engaged with the pinion  37   a,  a second gear  63   b  having a large diameter gear part engaged with a small diameter gear part of the first gear  63   a,  a third gear  63   c  having a large diameter gear part engaged with a small diameter gear part of the second gear  63   b,  a fourth gear  63   d  having a large diameter gear part engaged with a small diameter gear part of the third gear  63   c,  and a fifth gear  63   e  engaged with a small diameter gear part of the fourth gear  63   d.  The fifth gear  63   e  is attached so as to integrally rotate with the rotation member  61  and a rotation cam  41  described below. 
         [0070]    When the synchronous motor  37  is driven, a rotation drive force is transmitted to the rotation member  61  through the gear train  63  and the rotation member  61  is turned in one direction (clockwise direction CW with the rotation center axis “L 1 ” as a center). As a result, the eccentric pin  60  is moved in the one direction (clockwise direction CW with the rotation center axis “L 1 ” as a center) along a circular orbit around the rotation center axis “L 1 ”. While moving along the circular orbit, the eccentric pin  60  slides in the inside of the elongated hole  48  to swing the lever part  46  of the swing member  34  over a predetermined angular range. In this case, the swing member  34  is, as a whole, swung with a swing center line as a center which is coincided with the rotation center lines of the first rotor body  13  and the second rotor body  20  (in other words, a straight line coincided with the axial line “L”). 
         [0071]    As shown in  FIG. 5B , when the lever part  46  is moved to the second position  46 B at one end in the reciprocating swing range, as shown in  FIG. 5B  and  FIG. 6B , the first cam part  47  of the swing member  34  becomes to run on the first cam face portion  58   a  of the step face  56 . Therefore, the swing member  34  is moved upward in the axial line “L” direction to be set in a state moved to a disconnecting position  34 B. As a result, the second rotor body  20  supported by the swing member  34  is moved to an upper side in the axial line “L” direction against an urging force of the compression coil spring  28  and is separated from the first rotor body  13 . In other words, when the lever part  46  is moved to the second position  46 B at one end in the reciprocating swing range, engagement of the second rotor body  20  with the first rotor body  13  is released. In this manner, the clutch device  10  is set to be a disconnecting state in which a rotation drive force of the motor  5  is not transmitted to the washing tub  3 . 
         [0072]    On the other hand, as shown in  FIG. 5A , when the lever part  46  of the swing member  34  is moved to the first position  46 A at the other end in the reciprocating swing range, the first cam part  47  of the swing member  34  is slid down the second cam face portion  58   b  of the second cam face  58  and is placed on the third cam face portion  58   c.  In this case, the swing member  34  is moved down from the disconnecting position  34 B in the axial line “L” direction and is set in a state moved to a connecting position  34 A. When the swing member  34  is moved to the connecting position  34 A, the teeth part  21  of the second rotor body  20  supported by the swing member  34  is engaged with the teeth part of the first rotor body  13  to be a state that the second rotor body  20  and the first rotor body  13  are capable of being integrally rotated with each other. As a result, the clutch device  10  is set to be a connecting state in which a rotation drive force of the motor  5  is transmitted to the washing tub  3 . 
         [0073]    In the clutch device  10 , the cam mechanism  39  for moving the swing member  34  in the axial line “L” direction is provided with three first cam parts  47  formed on the swing member  34 . The first cam parts  47  are disposed on the swing member  34  with equal angular intervals with the axial line “L” which is its swing center line as a center. In other words, in the respective first cam parts  47 , the first cam face (inclined face  47   a  and lower end face  47   b ) which is slidably moved on the second cam face  58  of the cover frame  36  is disposed with equal angular intervals with the axial line “L” as a center. Therefore, in a disconnecting and connecting operation of the clutch device  10 , the swing member  34  is moved in a direction parallel to the axial line “L”, and the swing member  34  is moved without being inclined with respect to the rotation center lines (axial line “L”) of the first rotor body  13  and the second rotor body  20 . Accordingly, the second rotor body  20  supported by the swing member  34  can be moved without being inclined with respect to its rotation center line. 
         [0074]    In this embodiment, the second cam face  58  is formed so that the first cam part  47  of the swing member  34  is run on the first cam face portion  58   a  (disconnecting position holding cam face) at a predetermined position before the lever part  46  is reached to the first position  46 A at one end in the reciprocating swing direction. Then, the first cam part  47  moves on the flat first cam face portion  58   a  until reaching to the first position  46 A. Similarly, the second cam face  58  is formed so that the first cam part  47  of the swing member  34  is transferred to the third cam face portion  58   c  (connecting position holding cam face) at a predetermined position before the lever part  46  is reached to the second position  46 B at the other end in the reciprocating swing direction. Then, the first cam part  47  is moved on the flat third cam face portion  58   c  until reaching to the second position  46 B. 
         [0075]    As described above, the flat faces extended in the circumferential direction whose normal directions are set in directions parallel to the axial line “L” are provided at one end and the other end in the reciprocating swing direction of the second cam face  58 . Therefore, the vicinities of the one end and the other end in the reciprocating swing range of the lever part  46  are formed as regions where the second rotor body  20  is not moved in the axial line “L” direction which is a connecting and disconnecting direction of the clutch device. When these regions are provided, even in a case that timing of a drive signal to the synchronous motor  37  is deviated or the like due to rattling of structural members of the clutch device  10  such as the swing member  34  and the cover frame  36 , or due to rattling of the structural members of the first switch “A” and the second switch “B”, which causes lowering of drive accuracy of the swing member  34 , the clutch device  10  can be set in a connecting state and a disconnecting state surely. 
         [0076]      FIG. 8  is a plan view showing the clutch device  10  from which the first rotor body  13  and the cover frame  36  are detached and which is viewed from a lower side. When the synchronous motor  37  is rotated in one direction, the eccentric pin  60  is turned so as to pass a first rotation position  60 A and a second rotation position  60 B which are located on an imaginary line “L 3 ” that is perpendicular to an imaginary line “L 2 ” passing the swing center (axial line “L”) of the swing member  34  and a rotation center (rotation center axis “L 1 ”) of the rotation member  61  and that passes the rotation center of the rotation member  61 . When the eccentric pin  60  is moved to the first rotation position  60 A, the lever part  46  of the swing member  34  is moved to the first position  46 A which is one end in the reciprocating swing range and, when the eccentric pin  60  is moved to the second rotation position  60 B, the lever part  46  is moved to the second position  46 B which is the other end in the reciprocating swing range. 
         [0077]    The first rotation position  60 A and the second rotation position  60 B are located on a circular orbit and thus tangential directions at the first rotation position  60 A and the second rotation position  60 B are parallel to the imaginary line “L 2 ” formed by connecting the swing center of the swing member  34  with the rotation center of the rotation member  61 . This means that, in the first rotation position  60 A and the second rotation position  60 B, a moving amount (swing angle) of the lever part  46  with respect to a turning angle of the eccentric pin  60  is the smallest and, in the first position  46 A at the one end and the second position  46 B at the other end in the reciprocating swing range of the lever part  46 , swing of the lever part  46  can be controlled with a high degree of accuracy and a moving amount in the axial line “L” direction of the swing member  34  can be controlled finely. In other words, the conversion mechanism  38  is structured so that, while the eccentric pin  60  is turned at a constant speed, a moving amount in the axial line “L” direction of the swing member  34  can be controlled finely at the one end and the other end in the reciprocating swing range. Therefore, the second rotor body  20  can be stopped with a high degree of accuracy at both positions, i.e., at a clutch connecting position engaged with the first rotor body  13  and at a clutch disconnecting position disengaged from the first rotor body  13 . 
       (Switch) 
       [0078]    As shown in  FIGS. 3 and 4 , the first switch “A” and the second switch “B” and the rotation cam  41  structured to switch on and off states of the first switch “A” and the second switch “B” interlocked with the reciprocating swing of the swing member  34  are mounted between the mechanism mounting part  30 B of the main frame  30  and the motor case  31 . The rotation cam  41  is integrally rotated with the rotation member  61  which is rotated by the synchronous motor  37 . The rotation cam  41  is formed in a disk shape in which a part in a circumferential direction is recessed to an inner side in a radial direction and a cam face  42  is provided on its outer peripheral face. A part of the cam face  42  is formed to be a recessed part  43  which is recessed to an inner side in the radial direction. 
         [0079]      FIGS. 9A, 9B and 9C  are explanatory views showing the first switch “A”, the second switch “B” and the rotation cam  41 .  FIGS. 9A, 9B and 9C  are plan views which are viewed from a lower side of the clutch device  10  (first rotor body  13  side). As shown in  FIG. 3  and  FIGS. 9A, 9B and 9C , the first switch “A” includes a first stationary plate “A 1 ” disposed to an outer peripheral side of the rotation cam  41  and a first movable plate “A 2 ” which is disposed between the first stationary plate “A 1 ” and a cam face  42  facing the first stationary plate “A 1 ”. The first movable plate “A 2 ” is urged toward the cam face  42 . The first stationary plate “A 1 ” structures one of contact point electrodes of the first switch “A” and the first movable plate “A 2 ” structures the other of the contact point electrodes of the first switch “A”. 
         [0080]    The second switch “B” is symmetrically structured with the first switch “A” across the rotation cam  41 . In other words, the second switch “B” includes a second stationary plate “B 1 ” disposed to an outer peripheral side of the rotation cam  41  and a second movable plate “B 2 ” which is disposed between the second stationary plate “B 1 ” and a cam face  42  facing the second stationary plate “B 1 ”. The second movable plate “B 2 ” is urged toward the cam face  42 . The second stationary plate “B 1 ” structures one of contact point electrodes of the second switch “B” and the second movable plate “B 2 ” structures the other of the contact point electrodes of the second switch “B”. The first movable plate “A 2 ” and the second movable plate “B 2 ” are contacted with the cam face  42  at angular positions separated by 180 degrees with the rotation center axis “L 1 ” of the rotation cam  41  as a reference. 
         [0081]    When the synchronous motor  37  is driven, the rotation cam  41  is turned in the clockwise direction CW with the rotation center axis “L 1 ” as a center together with the rotation member  61  of the conversion mechanism  38 . As shown in  FIG. 9A , when the first movable plate “A 2 ” is fallen into the recessed part  43  of the cam face  42 , a contact point of the first movable plate “A 2 ” of the first switch “A” is separated from a contact point of the first stationary plate “A 1 ” to be set in an “OFF” state. As shown in  FIGS. 9B and 9C , when the first movable plate “A 2 ” is contacted with and slid on a part of the cam face  42  except the recessed part  43 , the contact points of the first movable plate “A 2 ” and the first stationary plate “A 1 ” are contacted with each other and thus the first switch “A” is set to be an “ON” state. 
         [0082]    When the rotation cam  41  is turned by 180 degrees from the state in  FIG. 9A , the second movable plate “B 2 ” of the second switch “B” is fallen into the recessed part  43  as shown in  FIG. 9C  and a contact point of the second movable plate “B 2 ” is separated from a contact point of the second stationary plate “B 1 ” and the second switch “B” is set to be an “OFF” state. When the second movable plate “B 2 ” of the second switch “B” is contacted with and slid on a part of the cam face  42  except the recessed part  43  as shown in  FIGS. 9A and 9B , the contact points of the second movable plate “B 2 ” and the second stationary plate “B 1 ” are contacted with each other to be an “ON” state. 
         [0083]    The first switch “A”, the second switch “B” and the rotation cam  41  are structured so that, when the eccentric pin  60  provided in the rotation member  61  is located at the first rotation position  60 A, the first movable plate “A 2 ” is fallen into the recessed part  43  and, when the eccentric pin  60  is located at the second rotation position  60 B, the second movable plate “B 2 ” is fallen into the recessed part  43 . In other words, the first switch “A” is, as shown in  FIG. 9A , turned to an “OFF” state when the lever part  46  of the swing member  34  is moved to the first position  46 A that is one end in the reciprocating swing range. Further, the second switch “B” is, as shown in  FIG. 9C , turned to an “OFF” state when the lever part  46  is moved to the second position  46 B that is the other end in the reciprocating swing range. Therefore, it can be detected by an OFF signal of the first switch “A” that the swing member  34  is moved to the connecting position  34 A and the clutch device  10  has been set in a connecting state. Further, it can be detected by an OFF signal of the second switch “B” that the swing member  34  is moved to the disconnecting position  34 B and the clutch device  10  has been set in a disconnecting state. 
         [0084]    Four metal plates (movable plate and stationary plate) structuring the first switch “A” and the second switch “B” are extended from both sides of the rotation cam  41  toward the terminal part  44  provided in an end part of the mechanism mounting part  30 B. The first stationary plate “A 1 ” and the second stationary plate “B 1 ” of the four metal plates are connected with the terminal part  44 . Four connector parts  44   a  through  44   d  are provided in the terminal part  44 . The first stationary plate “A 1 ” is electrically connected with a first terminal “T 1 ” disposed in the connector part  44   a . The second stationary plate “B 1 ” is electrically connected with a third terminal “T 3 ” disposed in the connector part  44   c.  Further, a fourth terminal “T 4 ” disposed in the connector part  44   d  is electrically connected with one of a first and a second drive wires for supplying electric power to the synchronous motor  37 . The first movable plate “A 2 ” and the second movable plate “B 2 ” are electrically connected with the fourth terminal “T 4 ”. In other words, the first movable plate “A 2 ” and the second movable plate “B 2 ” are electrically connected with one of the first and the second drive wires for supplying electric power to the synchronous motor  37  through the fourth terminal “T 4 ”. On the other hand, connecting second terminal “T 2 ” disposed in the connector part  44   b  is connected with the other of the first and the second drive wires for supplying electric power to the synchronous motor  37  and is connected with a power supply for driving the synchronous motor  37 . 
       (Drive Embodiments of Clutch Device) 
       [0085]      FIGS. 10A and 10B  are explanatory views showing drive embodiments of the clutch device  10 .  FIG. 10A  shows a first drive embodiment in which the first and the second switches “A” and “B” are provided in a power feeding circuit “C” to the synchronous motor  37 .  FIG. 10B  shows a second drive embodiment in which signals from the first and the second switches “A” and “B” are outputted to the outside of the clutch device  10 . The power feeding circuit “C” includes the synchronous motor  37 , a power supply for driving the synchronous motor  37 , and a switch for switching on and off the power supply to the synchronous motor  37 . In the embodiment in  FIG. 10A , the power feeding circuit “C” includes a first power feeding circuit “C 1 ” provided with the first switch “A” and a second power feeding circuit “C 2 ” provided with the second switch “B”. In other words, the first power feeding circuit “C 1 ” is a circuit which is structured so that one of contact points of the first switch “A” and a power supply are connected with each other through the first terminal “T 1 ”, the synchronous motor  37  and the power supply are connected with each other through the second terminal “T 2 ”, and the other of the contact points of the first switch “A” and the synchronous motor  37  are connected with each other through the fourth terminal “T 4 ”. Further, the second power feeding circuit “C 2 ” is a circuit which is structured so that one of contact points of the second switch “B” and a power supply are connected with each other through the third terminal “T 3 ”, the synchronous motor  37  and the power supply are connected with each other through the second terminal “T 2 ”, and the other of the contact points of the second switch “B” and the synchronous motor  37  are connected with each other through the fourth terminal “T 4 ”. The first power feeding circuit “C 1 ” and the second power feeding circuit “C 2 ” of the power feeding circuit “C” are respectively circuits in which a pair of drive lines (first and second drive lines) connected with the same power supply is connecting with the synchronous motor  37  through these terminals and the synchronous motor  37  is rotated by electric power supplied to the synchronous motor  37  through the first and the second drive lines. 
         [0086]      FIGS. 11A, 11B and 11C  are explanatory views showing states of the first and the second switches “A” and “B” and power feeding states in the power feeding circuit “C” when the clutch device  10  is switched from the connecting state to the disconnecting state in the first drive embodiment shown in  FIG. 10A . In the connecting state, the swing member  34  is located at the connecting position  34 A and the lever part  46  of the swing member  34  has been moved to the first position  46 A that is one end in the reciprocating swing range and thus, as shown in  FIG. 9A , the first switch “A” is in an “OFF” state and the second switch “B” is in an “ON” state. In this case, as shown in  FIG. 11A , power feeding to the synchronous motor  37  is started by the second power feeding circuit “C 2 ”. When the rotation cam  41  starts to turn, as shown in  FIG. 11B , both of the first switch “A” and the second switch “B” are set to be “ON”. When energization and driving to the synchronous motor  37  are further continued, the swing member  34  is reached to the disconnecting position  34 B and the lever part  46  is moved to the second position  46 B that is the other end in the reciprocating swing range and the second switch “B” is turned to be “OFF”. As a result, as shown in  FIG. 11C , the second power feeding circuit “C 2 ” is cut off and power feeding is stopped and thus the synchronous motor  37  is stopped. In other words, when the swing member  34  is reached to the disconnecting position  34 B, the synchronous motor  37  is automatically stopped and the swing member  34  is held at the disconnecting position  34 B and the clutch device  10  is set to be the disconnecting state. 
         [0087]      FIGS. 12A, 12B and 12C  are explanatory views showing states of the first and the second switches “A” and “B” and power feeding states in the power feeding circuit “C” when the clutch device  10  is switched from the disconnecting state to the connecting state in the first drive embodiment. In the disconnecting state, the swing member  34  is located at the disconnecting position  34 B and the lever part  46  of the swing member  34  has been moved to the second position  46 B that is the other end in the reciprocating swing range and thus, as shown in  FIG. 9C , the first switch “A” is in an “ON” state and the second switch “B” is in an “OFF” state. In this case, as shown in  FIG. 12A , power feeding to the synchronous motor  37  is started by the first power feeding circuit “C 1 ”. When the rotation cam  41  starts to turn, as shown in  FIG. 12B , both of the first switch “A” and the second switch “B” are set to be “ON”. When energization and driving to the synchronous motor  37  are further continued, the swing member  34  is reached to the connecting position  34 A and the lever part  46  is moved to the first position  46 A that is the one end in the reciprocating swing range and the first switch “A” is turned to be “OFF”. As a result, as shown in  FIG. 12C , the first power feeding circuit “C 1 ” is cut off and power feeding is stopped and thus the synchronous motor  37  is stopped. In other words, when the swing member  34  is reached to the connecting position  34 A, the synchronous motor  37  is automatically stopped and the swing member  34  is held at the connecting position  34 A and the clutch device  10  is set to be the connecting state. 
         [0088]    As described above, in a case that the first switch “A” and the second switch “B” are provided in the power feeding circuit “C”, when power feeding to the synchronous motor  37  is started by the first power feeding circuit “C 1 ” or the second power feeding circuit “C 2 ” and, when operation for switching connection and disconnection of the clutch device  10  has been completed, the switch of the power feeding circuit where power feeding is performed is cut off and operation of the clutch device  10  is stopped. Therefore, connection and disconnection of the clutch device  10  can be switched without performing complicated control such as controlling of a power feeding time period or judging of connection and disconnection of the clutch device  10  by detecting a position of a member. Further, when next connection and disconnection switching is to be performed, the power feeding circuit which was used for previous switching is in an off state and thus, the other power feeding circuit is energized to activate the synchronous motor  37 . After that, when power feeding is continued until the switch of the power feeding circuit being energized is cut off, connection and disconnection of the clutch device  10  can be switched. In other words, in order to repeatedly perform connection and disconnection of the clutch device  10 , it is sufficient that electric power is alternately supplied to the first power feeding circuit “C 1 ” and the second power feeding circuit “C 2 ” and its control is simple. 
         [0089]    Next, a second embodiment shown in  FIG. 10B  is structured so that a power feeding circuit “C” to the synchronous motor  37  does not use the first and the second switches “A” and “B” and that signals from the first stationary plate “A 1 ” and the second stationary plate “B 1 ” of the first and the second switches “A” and “B” are outputted to the outside of the clutch device  10 . For example, signals from the first and the second switches “A” and “B” are inputted to a control section  1 A for controlling respective parts of the washing machine  1  (see  FIG. 1  and  FIG. 10B ). Specifically, a relay R 1  of the control section  1 A is disposed between the first terminal “T 1 ” and the second terminal “T 2 ” and a relay R 2  of the control section  1 A is disposed between the third terminal “T 3 ” and the second terminal “T 2 ”. Further, in the control section  1 A, a switch of a power feeding circuit “C” is operated based on a signal from the first and the second switches “A” and “B” to drive and control the synchronous motor  37 . Specifically, based on signals from the first and the second switches “A” and “B”, a switch provided between the second terminal “T 2 ” and a power supply is turned on or off. In this embodiment, based on signals from the first and the second switches “A” and “B”, it can be detected whether the swing member  34  is located at the connecting position  34 A, the disconnecting position  34 B or another position in the control section  1 A. Therefore, based on the detected result, it can be determined whether switching of connection and disconnection of the clutch device  10  has been completed or not and power feeding to the synchronous motor  37  can be controlled. Alternatively, power feeding is performed for a predetermined setting time to drive the synchronous motor  37  and thereby connection and disconnection of the clutch device  10  can be performed. 
         [0000]    (Principal Operations and Effects in this Embodiment) 
         [0090]    In the clutch device  10  of the washing machine  1  in this embodiment, the swing member  34  is reciprocatedly swung based on rotation of the synchronous motor  37  and thereby the second rotor body  20  is engaged with or separated from the first rotor body  13  to switch connection and disconnection of the clutch device  10 . Further, the first and the second switches “A” and “B” are mechanically opened or closed by the rotation cam  41  interlocked with connection and disconnection of the clutch device  10  and the first and second switches “A” and “B” are capable of being connected with the power feeding circuit “C” to the synchronous motor  37 . Therefore, the synchronous motor  37  can be directly driven and controlled by the first and the second switches “A” and “B” depending on the connecting and disconnecting states of the clutch device  10 . Further, the first and the second switches “A” and “B” can be connected with an external control circuit such as the control section  1 A of the washing machine  1  and thus, based on signals from the two switches, the synchronous motor  37  can be driven and controlled by the external control circuit. Therefore, various drive control systems can be utilized and its versatility is high. 
       MODIFIED EMBODIMENTS 
       [0091]    (1) In the embodiment described above, the clutch device  10  is provided with the terminal part  44  for connecting with switches, a power supply, a motor and the like by using a connector. However, lead wires may be utilized for connection without using a connector. 
         [0092]    (2)  FIG. 13  is an explanatory view showing a rotation cam in a modified example. A rotation cam  141  in the modified example is different from the above-mentioned embodiment in a shape of a recessed part  143  formed in a cam face  142 . The recessed part  43  in the embodiment described above is formed in a symmetric shape in a circumferential direction. However, the recessed part  143  in this embodiment is formed in an asymmetric shape in a circumferential direction. As shown in  FIG. 13 , the recessed part  143  is provided with an inclined face  143   a  on a front side in a turning direction (clockwise direction CW) of the rotation cam  141  and an inclined face  143   b  on a rear side in the turning direction, and inclination of the inclined face  143   a  on the front side is larger than that of the inclined face  143   b  on the rear side. When the rotation cam  141  is turned in one direction in a clockwise direction CW, the first movable plate “A 2 ” or the second movable plate “B 2 ” is fallen into an inner side in a radial direction along the inclined face  143   a  on the front side in the turning direction and, after that, the first movable plate “A 2 ” or the second movable plate “B 2 ” is lifted to an outer side in the radial direction along the inclined face  143   b  on the rear side in the turning direction. 
         [0093]    In this modified example, the inclination of the inclined face  143   a  on the front side in a turning direction (clockwise direction CW) is set to be larger (steeper) than the inclination of the inclined face  143   b  on the rear side. Therefore, when the first movable plate “A 2 ” or the second movable plate “B 2 ” is fallen into the recessed part  143  and the first switch “A” or the second switch “B” is turned off, the contact point of the switch is rapidly separated. Accordingly, the contact point of the switch can be suppressed from being in an unstable contact state. As a result, in a structure that power feeding to the synchronous motor  37  for driving the clutch device  10  is controlled by on and off of the switch, chattering of a power supply for the synchronous motor  37  can be suppressed. 
         [0094]    While the description above refers to particular embodiments of the present invention, it will be understood that many modifications may be made without departing from the spirit thereof. The accompanying claims are intended to cover such modifications as would fall within the true scope and spirit of the present invention. 
         [0095]    The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.