Abstract:
Provided is a massage machine capable of performing a rubbing operation and a pressing operation separately on different areas of the back surface of a body part of a person to be treated while performing the rubbing operation on the side surface of the body part. Specifically provided is a massage machine (M 1  (M 2 )) provided with a rubbing unit ( 1 ) comprising a pair of rubbing parts ( 2, 2 ) for applying a rubbing massage to a body part of a person to be treated and a rubbing driving part ( 3 ) for driving the rubbing parts ( 2 ). The rubbing parts ( 2 ) comprise a pair of first rubbing parts ( 12, 12 ) disposed on both sides of the body part and reciprocating in the direction along the side surface of the body part, and a pair of second rubbing parts ( 13, 13 ) disposed on the back surface of the body part and reciprocating in the direction along the back surface of the body part and in the direction crossing the back surface.

Description:
TECHNICAL FIELD 
     The present invention relates to a massage machine provided with a rubbing unit including a rubbing part which performs a rubbing massage on a body part of a person to be treated, and a rubbing driving part which drives the rubbing part. 
     BACKGROUND ART 
     Conventionally, a massage machine which rubs a body part of a person to be treated has been known. One example of such a massage machine is configured such that a pair of treatment boards arranged on both sides of a body part of a person to be treated so as to interpose the body part is made to reciprocate along the side surfaces of the body part to perform a rubbing action on the side surfaces of the body part while a back treatment board disposed between the pair of treatment boards and arranged to the back of the body part is made to reciprocate in the vertical and the front-back directions to perform a rubbing action and a pressing action on the back surfaces of the body part (see PTL 1, for example). 
     CITATION LIST 
     Patent Document 
     
         
         [PTL 1] JP-A-2008-245968 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     According to the massage machine disclosed in above PTL 1, however, while it is possible to perform a rubbing action on the side surfaces of the body part and a rubbing action and a pressing action on the back surface of the body part, it is not possible to individually press different parts on the back surface of the body part. 
     Thus, the present invention was made to solve the above problem, and the object thereof is to provide a massage machine capable of individually performing a rubbing action and a pressing action on different parts on the back surface of a body part of a person to be treated while performing a rubbing action on the side surfaces of the body part. 
     Solution to Problem 
     The present invention provides a massage machine characterized by including: a rubbing unit including a pair of rubbing parts which performs rubbing massage on a body part of a person to be treated and a rubbing driving unit which drives the rubbing part, wherein the rubbing parts include a pair of first rubbing parts which is arranged on both sides of the body part and reciprocated in a direction along a side surface of the body part and a pair of left and right second rubbing parts which is arranged between the pair of first rubbing parts on the back surface of the body part and reciprocated in a direction along the back surface of the body part and in a direction perpendicular to the back surface. 
     With such a configuration, it is possible to rub the side surfaces of the body part by the pair of first rubbing parts and individually rub and press different portions in the back surface of the body parts by the pair of second rubbing part. 
     In addition, the present invention provides a massage machine characterized by including: a rubbing unit including a pair of rubbing parts which performs rubbing massage on a body part of a person to be treated and a rubbing driving unit which drives the rubbing parts, wherein the rubbing parts include a pair of external rubbing parts and an intermediate rubbing part arranged between the pair of external rubbing parts, wherein the external rubbing parts and the intermediate rubbing part include a first rubbing part which is arranged on a side of the body part and reciprocated in a direction along a side surface of the body part and a second rubbing part which is reciprocated in a direction along the back surface of the body part and in a direction perpendicular to the back surface. 
     With such a configuration, it is possible to rub both side surfaces of both legs with the first rubbing part included in the pair of external rubbing part and the first rubbing part included in the intermediate rubbing part and individually rub and press different portions in the back surfaces of both legs with the second rubbing part included in the pair of external rubbing part and the second rubbing part included in the intermediate rubbing part. 
     In addition, it is preferable that the first rubbing part and the second rubbing part are integrally configured. 
     With such a configuration, it is possible to drive both the first rubbing part and the second rubbing part only by transmitting the power of the rubbing driving unit to any one of the first rubbing part and the second rubbing part and drive the first rubbing part and the second rubbing part in a conjunction manner. Accordingly, it is not necessary to provide a transmission part or the like which drives the first rubbing part and the second rubbing part in a conjunction manner and thereby to simplify the configuration. 
     In addition, it is preferable that the pair of rubbing parts is reciprocated in mutually different phases. 
     With such a configuration, since the pair of first rubbing parts is reciprocated in mutually different phases, it is difficult for the body part to be displaced together in a direction along the side surfaces of the body part. Accordingly, positional deviation in the direction along the side surfaces of the body part occurs between the first rubbing part and the body part during the reciprocating action of the first rubbing part, and it is possible to appropriately rub the side surfaces of the body part. Moreover, since the pair of second rubbing parts is reciprocated in mutually different phases, the portions which are different in the left and the right sides in the back surface of the body part are pressed (vertical movement) at different timing, and it is possible to twist the body part in the horizontal direction. 
     In addition, it is preferable that the external rubbing parts and the intermediate rubbing part are reciprocated in mutually different phases. 
     With such a configuration, since first rubbing part included in the pair of external rubbing parts and the first rubbing part included in the intermediate rubbing part are reciprocated in mutually different phases, it is difficult for both legs to be displaced together in a direction along the side surfaces of the legs. Accordingly, positional deviation in the direction along the side surfaces of the legs occurs between the first rubbing part and the body part during the reciprocating action of the first rubbing part, and it is possible to appropriately rub the side surfaces of both legs. Moreover, since the second rubbing part included in the pair of external rubbing parts and the second rubbing part included in the intermediate rubbing part are reciprocated in mutually different phases, the portions which are different in the left and the right sides in the back surfaces of the legs are pressed (vertical movement) at different timing, and it is possible to twist both legs in the horizontal direction. 
     In addition, it is preferable that the rubbing parts include a massage part which is arranged in the inner surface of the first rubbing part to perform a massage on the body part. 
     With such a configuration, it is possible to perform the massage by the massage unit as well as the rubbing actions by the first rubbing parts and the second rubbing part. 
     In addition, it is preferable that the massage part is an air cell which expands and contracts by supply and discharge of air so as to press the body part. 
     With such a configuration, it is possible to easily adjust the interval between the pair of rubbing parts or the interval between the external rubbing parts and the intermediate rubbing part in accordance with the size and the shape of the body part. Moreover, it is possible to perform pressing massage on the body part by the expansion and the contraction of the air cell as well as the rubbing action. 
     It is preferable that the air cell expands and contracts during reciprocation of the rubbing part. 
     With such a configuration, it is possible to maintain the interval between the pair of rubbing parts or the interval between the external rubbing parts and the intermediate rubbing part in a state corresponding to the shape of the body part by appropriately adjusting the degree of the expansion of the air cell even if the positional relationship between the rubbing part and the body part is changed during the reciprocation of the rubbing part. 
     In addition, it is preferable that a plurality of air cells are provided in a direction along the body part. 
     With such a configuration, it is possible to more appropriately allow the interval between the pair of rubbing parts or the interval between the external rubbing parts and the intermediate rubbing part to substantially coincide with the shape of the body part. For example, it is possible to allow the interval between the pair of rubbing parts or the interval between the external rubbing parts and the intermediate rubbing part to substantially coincide with the shape of the leg by expanding the air cell located on the side of the calf so as to be larger than the air cell located on the side of the ankle when the body part to be massaged is legs. 
     In addition, it is preferable that the massage machine further includes a base part which supports the rubbing unit, wherein the base part includes a restriction part which restricts a movement of the rubbing part in a direction perpendicular to the side surface of the body part. 
     With such a configuration, it is possible to prevent the interval between the pair of rubbing parts or the interval between the external rubbing parts and the intermediate rubbing part from being unnecessarily increased due to the reaction force by the expansion of the air cell. 
     Advantageous Effects of Invention 
     According to the present invention, it is possible to provide a massage machine capable of individually performing a rubbing operation and a pressing operation on different parts on the back surface of a body part of a person to be treated while performing a rubbing operation on the side surfaces of the body part. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a front perspective view of a chair type massage machine provided with massage machines according to the first and second embodiments of the present invention. 
         FIG. 2  is a functional block diagram of the chair type massage machine shown in  FIG. 1 . 
         FIG. 3  is a front perspective view of the massage machine according to the first embodiment. 
         FIG. 4  is a front view of the massage machine in which a base part is omitted. 
         FIG. 5  is a front perspective view of the massage machine in which a rubbing part is omitted. 
         FIG. 6  is a front perspective view of the massage machine in which the base part is omitted. 
         FIG. 7  is a left side view of the massage machine, which illustrates actions of the rubbing part. 
         FIG. 8(   a ) is a front view of the massage machine, which schematically shows a state in which one end of an external rubbing part in the front-back direction is at the lowest position while the other end of an intermediate rubbing part in the front-back direction is at the highest position.  FIG. 8(   b ) is a front view of the massage machine, which schematically shows a state in which one end of the external rubbing part in the front-back direction is at the highest position while the other end of the intermediate rubbing part in the front-back direction is at the lowest position. 
         FIG. 9  is an action explanatory diagram of a rubbing driving source and an air cell in a treatment pattern  1 . 
         FIG. 10(   a ) is an action explanatory diagram of the rubbing driving source and the air cell in a treatment pattern  2 .  FIG. 10(   b ) is an action explanatory diagram of the rubbing driving source and the air cell in a treatment pattern  3 . 
         FIG. 11  is an action explanatory diagram of the rubbing driving source and the air cell in a treatment pattern  4 . 
         FIG. 12(   a ) is an action explanatory diagram of the rubbing driving source and the air cell in a treatment pattern  5 .  FIG. 12(   b ) is an action explanatory diagram of the rubbing driving source and the air cell in a treatment pattern  6 . 
         FIG. 13  is a front perspective view of the massage machine according to the second embodiment. 
         FIG. 14  is a front perspective view of the massage machine in which a massage part is omitted. 
         FIG. 15  is a front view of the massage machine in which a part of a base part is omitted. 
         FIG. 16  is a left side view of the massage machine. 
         FIG. 17  is a front perspective view of the massage machine in which a part of the rubbing part is omitted. 
         FIG. 18  is a front perspective view showing the main parts of a power transmission part of the massage machine. 
         FIG. 19  is a left side view showing the main parts of the rubbing part of the massage machine for illustrating the actions of the rubbing part. 
         FIG. 20(   a ) is a back perspective view of the massage machine for illustrating an example of an angle adjustment mechanism.  FIG. 20(   b ) is a left side view of the massage machine for illustrating another example of the angle adjustment mechanism. 
         FIG. 21  is a front perspective view of the massage machine for illustrating other configurations of the massage part. 
         FIG. 22  is a functional block diagram of the strength adjustment part (version 1), which illustrates the configuration of a detection part according to the first embodiment. 
         FIG. 23  is a functional block diagram of the strength adjustment part (version 1), which illustrates the configuration of the detection part according to the second embodiment. 
         FIG. 24  is a front view schematically showing the massage machine, which illustrates the configuration of the detection part according to the second embodiment included in the strength adjustment part (version 1). 
         FIG. 25(   a ) is a front view schematically showing en external rubbing part of the massage machine in a state in which the air cell is contracted, which illustrates the configuration of the detection part according to the third embodiment included in the strength adjustment part (version 1).  FIG. 25(   b ) is a front view schematically showing the external rubbing part of the massage machine in a state in which the air cell is expanded, which illustrates the configuration of the detection part according to the third embodiment included in the strength adjustment part (version 1). 
         FIG. 26  is a front perspective view of the massage machine, in which the rubbing part is omitted, which illustrates the configuration of the strength adjustment part (version 2). 
         FIG. 27  is a front view schematically showing the massage machine, which illustrates the configuration of the strength adjustment part (version 3). 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Overall Configuration 
     Hereinafter, description will be made of the overall configuration of a chair type massage machine  100  provided with massage machines M 1  and M 2  according to the first and second embodiments of the present invention with reference to  FIGS. 1 and 2 .  FIG. 1  is a front perspective view of the chair type massage machine provided with massage machines according to the first and second embodiments of the present invention, and  FIG. 2  is a functional block diagram of the chair type massage machine shown in  FIG. 1 . 
     As shown in  FIG. 1 , the chair type massage machine  100  provided with the massage machine M 1  according to the first embodiment of the present invention and the massage machine M 2  according to the second embodiment of the present invention includes a seat part  101  on which a person to be treated sits, a backrest part  102  which is rotatably coupled to the back side of the seat part  101  in the front-back direction (the direction of an arrow a), a foot rest part  103  which is rotatably coupled to the front side of the seat part  101  in the front-back direction (the direction of an arrow b), armrest parts  104  and  104  provided on both the left and right sides of the seat part  101 , and supporting leg parts  105  and  105  extended downward from the armrest parts  104  and  104  and placed on the floor. As for the concept of the directions in this specification, the front side is “front”, the back side is “back”, the left side is “left”, the right side is “right”, the head side is “upper”, and the lower back side is “lower” when a person to be treated who is seated on the chair type massage machine  100  in the state in which the back rest part  102  is made to stand and the foot rest  103  is made to be raised up to a substantially horizontal state faces the front side. 
     As shown in  FIGS. 1 and 2 , the backrest part  102  can be reclined about an axis in the horizontal direction by an actuator  106  including an electric motor, a fluid pressure cylinder, an air cell, or the like and stopped at an arbitrary position between a standing state shown by a solid line in  FIG. 1  and an inclined state shown by a two-dot chain line. In addition, the footrest  103  can be rotated in the vertical direction about an axis in the horizontal direction by an actuator  107  including an electric motor, a fluid pressure cylinder, an air cell, or the like and stopped at an arbitrary position between a raising state shown by a solid line in  FIG. 1  and a suspending state shown by a two-dot chain line. 
     As shown in  FIG. 1 , this chair type massage machine  100  is provided with the massage machine M 1  in front of the seat part  101  as a footrest  103  which performs leg massage, the massage machine M 2 , which performs hip massage, in the seat part  101 , the massage machine M 2 , which performs body massage, on the backrest part  102 , and the massage machines M 2 , which perform arm massage, on the both armrest parts  104  and  104 . 
     First Embodiment 
     Hereinafter, description will be made of the configuration of the massage machine M 1  according to the first embodiment of the present invention with reference to  FIGS. 3 to 6 .  FIG. 3  is a front perspective view of the massage machine M 1 ,  FIG. 4  is a front view of the massage machine M 1  in which a base part  4  is omitted,  FIG. 5  is a front perspective view of the massage machine M 1  in which a rubbing part  2  is omitted, and  FIG. 6  is a front perspective view of the massage machine M 1  in which the base part  4  is omitted. 
     [Overall Configuration of Massage Machine] 
     As shown in  FIG. 1 , the massage machine M 1  is provided such that the side of one end in the front-back direction (front portion) can be rotated in the vertical direction while the side of the other end in the front-back direction (back portion) is coupled to the front portion of the seat part  101 . As shown in  FIGS. 3 to 5 , this massage machine M 1  is constituted by a rubbing unit  1  including rubbing parts  2  which respectively perform rubbing massage on each side surface of both legs of the person to be treated and a rubbing driving part  3  which drives these rubbing parts  2 , and a base part  4  which is coupled to the front portion of the seat part  101  to support the rubbing unit  1 . 
     As shown in  FIGS. 1 and 2 , an air supply/discharge apparatus  5  including a pump, a valve, and the like which supplies and discharges air to and from the air cell  7  as a massage part provided in the massage machine M 1 , which will be described later, and a control part  6  such as a microcomputer including a CPU which drives and controls the rubbing driving part  3  and the air supply/discharge apparatus  5 , a memory (RAM), and a storage part (ROM). This control part  6  is electrically connected to an operation part  108  operated by a person to be treated and outputs an output signal for driving and controlling the rubbing driving part  3 , the air supply/discharge apparatus  5 , and actuators  106  and  107  based on the input signal input from the operation part  108 . 
     [Configuration of Base Part] 
     As shown in  FIG. 5 , the base part  4  has a configuration in which the upper side thereof is opened by a plate-shaped bottom portion  4   a , plate-shaped side portions  4   b  and  4   b  provided so as to stand on both left and right sides of the bottom portion  4   a , a plate-shaped front portion  4   c  provided so as to stand on the front side of the bottom  4   a , and a plate-shaped back portion  4   d  provided so as to stand on the back side of the bottom portion  4   a . The rubbing part  2  is movably supported at the left and right side portions  4   b  and  4   b  of the base part  4  through a power transmission part  8  which will be described later. In addition, the power transmission part  8  and the rubbing driving source  9  constituted by a motor and the like which drives the rubbing part  2  through the power transmission part  8  are supported at the bottom portion  4   a  of the base part  4 . 
     [Configuration of Rubbing Part] 
     As shown in  FIGS. 3 to 6 , the rubbing part  2  includes a pair of left and right external rubbing parts  10  and  10  which are supported by the base part  4  through the power transmission part  8 , coupled to the power transmission part  8  so as to be movable in the vertical and the front-back directions, and arranged on the external sides of both legs, and an intermediate rubbing part  11  which is coupled to the power transmission part  8  so as to be movable in the vertical and the front-back directions and arranged between the pair of left and right external rubbing parts  10  and  10 . 
     The external rubbing part  10  is constituted by a plate-shaped first rubbing part  12  including a facing inner surface  12   a  facing the external surface of the leg and a plate-shaped second rubbing part  13  including a facing inner bottom surface  13   a  which is integrally configured with the first rubbing part  12 , provided so as to extend from the lower end portion to the left and right inner sides of the first rubbing part  12 , and faces the back surface of the leg, while the pair of left and right external rubbing parts  10  and  10  are movably supported by both side portions  4   b  and  4   b  of the base part  4  through the power transmission part  8 . 
     The intermediate rubbing part  11  includes a plate-shaped first rubbing part  14  including the facing inner surfaces  14   a  and  14   a  which respectively face the inner surfaces of both legs and plate-shaped second rubbing parts  15  and  15  including facing inner bottom surfaces  15   a  and  15   a  which are integrally configured with the first rubbing part  14 , provided so as to extend from the lower end portion to both the left and right sides of the first rubbing part  14 , and faces the back surfaces of both legs, while the intermediate rubbing part  11  is movably supported by the both side portions  4   b  and  4   b  of the base part  4  through the power transmission part  8 . 
     The first rubbing parts  12  and  14  included in the pair of left and right external rubbing parts  10  and  10  and the intermediate rubbing part  11  and the second rubbing parts  13  and  15  included in the pair of left and right external rubbing parts  10  and  10  and the intermediate part  11  constitute a pair of left and right recessed portions M 1   a  and M 1   a  which contain the leg openings at their upper sides and the both front and back ends, both side surfaces of both legs contained in this pair of left and right recessed portions M 1   a  and M 1   a  are supported by the first rubbing parts  12  and  14  while the back surface of both legs is supported by the second rubbing parts  13  and  15 . 
     As shown in  FIGS. 3 and 4 , the first rubbing parts  12  and  14  included in the pair of left and right external rubbing parts  10  and  10  and the intermediate rubbing part  11  have substantially rectangular shapes when viewed from the side with a longer dimension in the front-back direction (the longitudinal direction of the legs) while the facing inner surfaces  12   a  and  14   a  of the first rubbing parts  12  and  14  are inclined surfaces in which the lower end sides are slightly inclined inwardly. In addition, the first rubbing parts  12  and  14  have air cells  7  which press the external surfaces of the legs of the person to be treated, which will be described later, and a plurality of air cells  7  is provided in the facing inner surfaces  12   a  and  14   a  of the first rubbing part  12  and  14  along the front-back direction (the longitudinal direction of the legs). These air cells  7  are connected to the air supply/discharge apparatus  5  through an air piping (not shown) so as to be able to be expanded and contracted by the supply and discharge of the air. 
     The second rubbing parts  13  and  15  included in the pair of left and right external rubbing parts  10  and  10  and the intermediate part  11  have substantially rectangular shapes when viewed from the upper direction of the longer dimension in the front-back direction (the longitudinal direction of the legs), and the facing inner bottom surfaces  13   a  and  15   a  of the second rubbing parts  13  and  15  are inclined surfaces in which the inner end sides are slightly inclined downwardly. In addition, the second rubbing part  13  of the external rubbing part  10  and the second rubbing part  15  of the intermediate rubbing part  11  are arranged to be close to each other such that the leg does not fall into the gap between both the second rubbing parts  13  and  15 . 
     As shown in  FIG. 4 , the rubbing part  2  constituted by the pair of left and right external rubbing parts  10  and  10  and the intermediate part  11  is integrally covered with a cover part  16  constituted by a cloth or the like with the stretch surface so as to prevent the rubbing part  2  from being exposed to the outside and reduce the risk of the leg being trapped between both the second rubbing parts  13  and  15 . 
     [Configuration of Rubbing Driving Part] 
     Hereinafter, description will be made of the configuration of the rubbing driving part  3  with reference to  FIGS. 5 and 6 . 
     As shown in  FIGS. 5 and 6 , the rubbing driving part  3  includes a rubbing driving source  9  such as a motor and the like driven by the control part  6  and a power transmission part  8  which transmits the rotation power of the rubbing driving source  9  to cause the rubbing part  2  to act, and the rubbing driving part  3  is provided in the base part  4 . The output axis of the rubbing driving source  9  is provided along the front-back direction (the longitudinal direction of the legs), and the power transmission part  8  includes a gear case  17  with a worm gear to change the rotation direction of the output axis of the rubbing driving source  9  for deceleration and a transmission shaft  18  which is connected to this worm gear and rotated about an axial center directing to the horizontal direction (the width direction of the legs). This transmission shaft  18  is rotatably supported on the one end side (the front end portion in this embodiment) in the front-back direction of the base part  4 . In this embodiment, the rubbing driving source  9  is constituted by a motor and the rotation direction and the rotation speed of the output axis thereof are configured to be variable by the control part  6 . 
     Both the left and right ends of the transmission shaft  18  are rotatably supported by both side portions  4   b  and  4   b  of the base portion  4 , and more specifically, supported by ring-shaped first holders  19  and  19  included in both side portions  4   b  and  4   b  through the bearing  20  externally fitted onto the outer circumferential portion of the rotation axis of the transmission shaft  18 . In addition, an eccentric cam  21  is provided at a position corresponding to each rubbing part  2  in a midway portion of the transmission shaft  18  in the horizontal direction, and more specifically, two each of the external eccentric cams  21   a  which are coupled to the pair of left and right external rubbing parts  10  and  10  are provided on the left and right sides, two intermediate eccentric cams  21   b  which are coupled to the intermediate rubbing part  11  are provided on the left and right sides, and a total of 6 eccentric cams  21  are provided. 
     Such eccentric cams  21  have disk shapes with a thickness in the horizontal direction, and a rotation axis center  21   c  is provided at a position distant from the center of the geometric circle of the outer shape. In addition, this rotation axis center  21   c  coincides with the axial center of the transmission shaft  18 . The rotation axis center  21   c  of the eccentric cam  21  has a through hole  21   d  which penetrates therethrough in the horizontal direction, the eccentric cam  21  is supported by the transmission shaft  18  by inserting the transmission shaft  18  into this through hole  21   d , and this plurality of eccentric cams  21  can be integrally rotated with the transmission shaft  18 . Moreover, the external eccentric cams  21   a ,  21   a ,  21   a , and  21   a  coupled to the pair of left and right external rubbing parts  10  and  10  have the same phases with respect to the rotation axis center  21   c  while the external eccentric cams  21   a ,  21   a ,  21   a , and  21   a  coupled to the pair of left and right external rubbing parts  10  and  10  have different phases with respect to the rotation axis center  21   c  from those of the intermediate eccentric cams  21   b  and  21   b  coupled to the intermediate rubbing part  11 . In the first embodiment, the phases of the external eccentric cam  21   a  and the intermediate eccentric cam  21   b  with respect to the rotation axis center  21   c  are different from each other by 180°. 
     Furthermore, these eccentric cams  21  are attached to the external rubbing part  10  and the intermediate rubbing part  11  through the ring-shaped second holder  22  with an opening directed to the horizontal direction. This second holder  22  is attached to each rubbing part  2  by a coupling means (not shown) such as a bolt, and the eccentric cam  21  is loosely fitted into the ring-shaped second holder  22 . 
     A rod-shaped guide shaft  23  with an axial center which guides the displacement of the rubbing part  2  with respect to the base part  4  and is directed to the horizontal direction is supported by the other end side (the back end in this embodiment) in the front-back direction of the base part  4 , and more specifically, both the left and right end portions of this guide shaft  23  are supported by both side portions  4   b  and  4   b  while the midway portion in the horizontal direction is supported by the bottom portion  4   a  of the base part so as not to be rotated. This guide shaft  23  is attached to the other end side (the back end in this embodiment) in the front-back direction of the external rubbing part  10  and the intermediate rubbing part  11  through the third holder  24 , and more specifically, inserted into a guide hole  25  which opens in the horizontal direction of the longer dimension in the longitudinal direction of the legs included in the third holder  24 . This third holder is provided corresponding to each rubbing part  2  (that is, corresponding to the pair of left and right external rubbing parts  10  and  10  and the intermediate part  11 ), and one guide shaft  23  is inserted into the guide holes included in the third holder provided in each rubbing part  2  in a skewered manner. Accordingly, each rubbing part  2  can be relatively displaced in the front-back direction along the longitudinal direction of the guide holes  25  within the range of the guide holes  25  while the rotation of the other end side is restricted by the guide shaft  23 . 
     [Configuration of Massage Part] 
     Hereinafter, description will be made of the configuration of the massage part included in the rubbing part  2  with reference to  FIG. 3 . 
     As shown in  FIG. 3 , an air cell  7  which expands and contracts due to the supply and the discharge of the air shown by a broken line is employed as the massage part in this embodiment, which performs a massage on the body part of the person to be treated. The air cells  7  are provided in the facing inner surfaces  12   a  and  14   a  of the first rubbing parts  12  and  14  included in the pair of outer rubbing parts  10  and  10  and the intermediate rubbing part  11 , and have substantially flat shapes in the side view during the contraction, and are expanded inwardly in the horizontal direction during the expansion when air is supplied from the air supply/discharge apparatus  5 . In addition, these air cells  7  may have an undevelopable base part with a lower portion attached to the facing inner surfaces  12   a  and  14   a  of the first rubbing parts  12  and  14  and a developing part with an upper portion which can be developed inwardly in the horizontal direction such that these air cells  7  have substantially flat shapes in the side view during the contraction and the developing part is expanded and developed inwardly in the horizontal direction in an accordion-like manner with respect to the base part during the expansion when air is supplied from the air supply/discharge apparatus  5 . 
     These air cells  7  are provided in the inner surface  12   a  of the first rubbing part  12  included in the external rubbing part  10  and both inner surfaces  14   a  and  14   a  of the first rubbing part  14  included in the intermediate rubbing part  11  and constitute an air cell group  26 L which presses both side surfaces of the left leg and an air cell group  26 R which presses both side surfaces of the right leg. In addition, a plurality of air cell groups  26 L and  26 R is provided in the front-back direction (the longitudinal direction of the legs), and it is possible to press both legs with the plurality of air cell groups  26 L and  26 R in accordance with the change in thickness of the legs in the longitudinal direction. Accordingly, when the air supply/discharge apparatus  5  is driven by the output signal from the control part  6 , and air is supplied to the plurality of left and right air cell groups  26 L and  26 R, the pressing massage is performed on the legs due to the expansion of the air cells  7 , and the intervals of the recessed portions M 1   a  which contain the legs are adjusted to the intervals corresponding to the size of the legs of the person to be treated. 
     [Actions of Rubbing Part] 
     Hereinafter, description will be made of/the actions of the rubbing part  2  with reference to  FIG. 7 .  FIG. 7  is a side view of the massage machine M 1 , which illustrates the actions of the rubbing part  2 . 
     When the rubbing driving source  9  is driven, and the output shaft of the rubbing driving part  3  with the aforementioned configuration is rotated, the transmission shaft  18  provided on one end side (the front end portion in this embodiment) in the front-back direction of the base part  4  is rotated about the axial center in conjunction with the rotation of the output shaft through the gear case  17 , and the eccentric cam  21  attached to the left and right midway portion of the transmission shaft  18  revolves about the rotation axis center of the transmission shaft  18 . Then, the second holder  22  supporting the eccentric cam  21  is made to perform a circular movement along the revolution track of the eccentric cam  21  due to the revolution of the eccentric cam  21 . On the other hand, since the guide shaft  23  provided on the other end side (the back end portion in this embodiment) in the front-back direction of the base part  4  is inserted into the guide holes  25  included in the third holder  24  provided in each rubbing part  2 , the circular movement of the rubbing part  2  itself is restricted regardless of the circular movement of the second holder  22 . As a result, the rubbing part  2  is reciprocated once in the front-back direction by a predetermined distance and performs an orbiting action for inclination in the front-back direction while the transmission shaft  18  is rotated once. 
     At this time, a fixed point  12 A positioned substantially at the center of the first rubbing part  12  included in the pair of left and right external rubbing parts  10  and  10  in the side view orbits along a substantially oval-shaped track  12 B with a longer dimension in the front-back direction while a fixed point  12 C positioned at the front portion of the upper end of the first rubbing part  12  orbits along a substantially oval-shaped track  12 D with a longer dimension than that of the track of the fixed point  12 A. In addition, since the second rubbing part  13  included in the external rubbing part  10  is integrally configured with the first rubbing part  12 , the second rubbing part  13  performs an orbiting action for inclination in the front-back direction while being reciprocated once in the front-back direction by a predetermined distance in conjunction with the orbiting of the first rubbing part  12 . Moreover, the rubbing driving source  9  of the rubbing driving part  3  is electrically connected to the control part  6  through a drive circuit (not shown), and the action thereof is controlled by an electric signal output from the drive circuit based on the control signal from the control part  6 . 
     Incidentally, the external eccentric cam  21   a  attached to the external rubbing part  10  and the intermediate eccentric cam  21   b  attached to the intermediate rubbing part  11  have phases which are different from each other by 180° as described above. Accordingly, the phases of the orbiting external rubbing parts  10  and  10  and the intermediate rubbing part  11  are different from each other by 180°, and therefore, the external rubbing parts  10  and  10  and the intermediate rubbing part  11  are displaced in the opposite directions. That is, the intermediate part  11  is displaced to the other side (back side) in the front-back direction while the external rubbing parts  10  and  10  are displaced to one side (front side) in the front-back direction, and the one end side (front end portion) of the intermediate rubbing part  11  is displaced to the other side (downward) in the vertical direction and the other end side (back end portion) in the front-back direction is displaced to one side (upward) in the vertical direction when the one end side (front end portion) of the external rubbing parts  10  and  10  in the front-back direction is displaced to the one side (upward) in the vertical direction and the other end side (back portion) in the front-back direction is displaced to the other side (downward) in the vertical direction. 
     [Configuration of Anti-Trap Mechanism] 
     Hereinafter, description will be made of the anti-trap mechanism with reference to  FIGS. 4 ,  6 , and  8 . FIG.  8 ( a ) is a diagram schematically showing the massage machine  1  when viewed from the front thereof in a state in which one end side of the external rubbing part  10  in the front-back direction is in the lowest position while the other end side of the intermediate rubbing part  11  in the front-back direction is in the highest position.  FIG. 8(   b ) is a diagram schematically showing the massage machine  1  when viewed from the front thereof in a state in which one end side of the external rubbing part  10  in the front-back direction is in the highest position while the other end side of the intermediate rubbing part  11  in the front-back direction is in the lowest position. 
     As shown in  FIGS. 4 and 6 , the external rubbing part  10  is provided so as to extend downwardly from the inner end portion in the horizontal direction of the facing inner bottom surface  13   a  of the second rubbing part  13  and from both the front and back end portions and includes a plate-shaped side wall  13   b  with a predetermined dimension D 1  in the vertical direction. In the same manner as in the external rubbing part  10 , the intermediate rubbing part  11  is provided so as to extend downwardly from the inner end portion in the horizontal direction of the facing inner bottom surface  15   a  of the second rubbing part  15  and from both the front and back end portions and includes a plate-shaped side wall  15   b  with a predetermined dimension D 2  in the vertical direction. Although the predetermined dimension D 1  of the side wall  13   b  included in the second rubbing part  13  of the external rubbing part  10  is set to be the same as the predetermined dimension D 2  of the side wall  15   b  included in the second rubbing part  15  of the intermediate rubbing part  11  in the first embodiment of the present invention, the dimensions may be set differently. 
     As shown in  FIG. 8(   a ), the setting is made such that a distance D 3  from the lower end portion of the side wall  13   b  of the external rubbing part  10  to the upper end portion (the upper surface of the facing inner bottom surface  15   a  of the intermediate rubbing part  11 ) of the side wall  15   b  of the intermediate rubbing part  11  is smaller than the sum of the predetermined dimension D 1  of the side wall  13   b  and the predetermined dimension D 2  of the side wall  15   b , in a state in which the one end side of the external rubbing part  10  in the front-back direction is in the lowest position while the one end side of the intermediate rubbing part  11  in the front-back direction is in the highest position. In addition, as shown in  FIG. 8(   b ), the setting is made such that a distance D 4  from the upper end portion (the upper surface of the facing inner bottom surface  13   a  of the external rubbing part  10 ) of the side wall  13   b  of the external rubbing part  10  to the lower end portion of the side wall  15   b  of the intermediate rubbing part  11  is smaller than the sum of the predetermined dimension D 1  of the side wall  13   b  and the predetermined dimension D 2  of the side wall  15   b , in a state in which the one end side of the external rubbing part  10  in the front-back direction is in the highest position while the one end side of the intermediate rubbing part  11  in the front-back direction is in the lowest position. 
     Accordingly, it is possible to prevent the legs from being trapped between the second rubbing part  13  of the external rubbing part  10  and the second rubbing part  15  of the intermediate rubbing part  11  since the side surface of the side wall  13   b  included in the external rubbing part  10  always overlaps the side surface of the side wall  15   b  included in the intermediate rubbing part  11  during the action of the rubbing part  2 . That is, the anti-trap mechanism is configured by the side wall  13   b  included in the external rubbing part  10  and the side wall  15   b  included in the intermediate rubbing part  11  in order to prevent the body part (legs) of the person to be treated from being trapped. 
     [Treatment Pattern] 
     Hereinafter, description will be made of one example of a treatment pattern of the massage machine M 1  with reference to  FIGS. 9 and 12 . 
       FIG. 9  is a diagram illustrating actions of the rubbing driving source and the air cell during the treatment pattern  1 ,  FIG. 10(   a ) is a diagram illustrating actions of the rubbing driving source and the air cell during the treatment pattern  2 ,  FIG. 10(   b ) is a diagram illustrating actions of the rubbing driving source and the air cell during the treatment pattern  3 ,  FIG. 11  is a diagram illustrating actions of the rubbing driving source and the air cell during the treatment pattern  4 ,  FIG. 12(   a ) is a diagram illustrating actions of the rubbing driving source and the air cell during the treatment pattern  5 , and  FIG. 12(   b ) is a diagram illustrating actions of the rubbing driving source and the air cell during the treatment pattern  6 . 
     As shown in  FIG. 9 , the treatment pattern  1  is a pattern in which both side surfaces of the legs are rubbed while being pinched with the air cell groups  26 L and  26 R from the left and right sides. The control part  6  drives the rubbing driving source  9  to cause the rubbing part  2  to perform an orbit action in a state in which the expansion of the air cell groups  26 L and  26 R is maintained after air is supplied to the air cell groups  26 L and  26 R for expansion. More specifically, air is firstly supplied to the air cell groups  26 L and  26 R for a predetermined time period T 1 . After the elapse of the predetermined time period T 1 , a motor as the rubbing driving source  9  is normally rotated to cause the rubbing part  2  to perform the orbit action for a predetermined time period T 2  in a state in which the expansion of the air cell groups  26 L and  26 R is maintained. After the elapse of the predetermined time period T 2 , the motor as the rubbing driving source  9  is normally rotated to cause the rubbing part  2  to perform the orbit action in the opposite direction to that in the previous orbit action for a predetermined time period T 3  in a state in which the expansion of the air cell groups  26 L and  26 R is maintained. After the elapse of the predetermined time T 3 , the normal rotation and the reverse driving of the motor as the rubbing driving source  9  are repeated in a state in which the expansion of the air cell groups  26 L and  26 R are continuously maintained. The driving speed of the motor as the rubbing driving source  9  may be made to be gradually lower and higher over time during the predetermined time period T 2  and/or the predetermined time period T 3 . 
     As shown in  FIGS. 10(   a ) and  10 ( b ), the treatment pattern  2  is a pattern in which the both side surfaces of the legs are rubbed while being pinched with the air cell groups  26 L and  26 R from both the left and right sides and the force of pinching is gradually strengthened, and the treatment pattern  3  is a pattern in which the both side surface of the legs are rubbed while being pinched with the air cell groups  26 L and  26 R and the force of pinching is gradually weakened. In the treatment pattern  2 , the control part  6  supplies air and expands the air cell groups  26 L and  26 R in a state in which the orbit action of the rubbing part  2  is maintained after the control part  6  drives the rubbing driving source  9  and causes the rubbing part  2  to perform the orbit action. More specifically, the motor as the rubbing driving source  9  is firstly driven for a predetermined time period T 4  (normal rotation or reverse driving), and air is supplied after the elapse of the predetermined time period T 4  to the air cell groups  26 L and  26 R for a predetermined time period T 5  in a state in which the motor as the rubbing driving source  9  is driven (a state in which a shift between the normal rotation and the reverse driving of the motor is repeatedly executed) and then discharged. In the treatment pattern  3 , the control part  6  supplies air and expands the air cell groups  26 L and  26 R and then discharges the air and contracts the air cell groups  26 L and  26 R, drives the rubbing driving source  9  substantially at the same time as the start of the contraction of the air cell groups  26 L and  26 R, and causes the rubbing part  2  to perform the orbit action. More specifically, air is firstly supplied to the air cell groups  26 L and  26 R for a predetermined time period T 6 . After the elapse of the predetermined time period T 6 , air is discharged from the air cell groups  26 L and  26 R for a predetermined time period T 7 . The motor as the rubbing driving source  9  is driven (normal rotation or reverse driving) at substantially the same time as the start of the contraction of the air cell groups  26 L and  26 R for a predetermined time period T 8 . According to these treatment patterns  1  to  3 , it is possible to loosen muscle fibers that have become fascicles in the diameter directions (horizontal and vertical directions) of the legs. 
     As shown in  FIG. 11 , the treatment pattern  4  is a pattern in which the action and stopping of the rubbing part  2  is frequently repeated and the legs are pinched with the air cell groups  26 L and  26 R from both the left and right sides in a state in which the rubbing part  2  is stopped. The control part  6  drives the rubbing driving source  9  to change the position of the rubbing part  2 , then stops the driving of the rubbing driving source  9 , supplies air and expands the air cell groups  26 L and  26 R, and frequently repeats the action and stopping of the rubbing part  2  and the expansion of the air cell groups  26 L and  26 R in this order. More specifically, the motor as the rubbing driving source  9  is driven (normal rotation or reverse driving) for a predetermined time period T 9 . After the elapse of the predetermined time period T 9 , the driving of the rubbing driving source  9  is stopped, and the air is supplied to the air cell groups  26 L and  26 R at the same time as the stopping of the rubbing driving source  9  for a predetermined time period T 10 . After the elapse of the predetermined time period T 10 , the air is discharged from the air cell groups  26 L and  26 R for a predetermined time period T 11 . The series of actions performed in the predetermined time periods T 9  to T 11  are repeated. According to this treatment pattern  4 , it is possible to change the positions at which the legs are pinched (pressed) with the air cell groups  26 L and  26 R. 
     As shown in  FIG. 12(   a ), the treatment pattern  5  is a pattern in which a state where the orbit action speed of the rubbing part  2  is low while the pressing force of the air cell groups  26 L and  26 R is large is gradually shifted to a state where the orbit action speed of the rubbing part  2  is high while the pressing force of the air cell groups  26 L and  26 R is small. The control part  6  drives (normal rotation or reverse driving) the rubbing driving part  9  at a predetermined speed S 1  for a predetermined time period T 12 , supplies air to the air cell groups  26 L and  26 R at substantially the same time as the start of the driving of this rubbing driving source  9  up to a predetermined pressure P 1  for a predetermined time period T 12  and causes the air cell groups  26 L and  26 R to maintain it. After the elapse of the predetermined time period T 12 , the rubbing driving source  9  is driven (normal rotation or reverse driving) at a predetermined speed S 2  which is higher than the predetermined speed S 1  for a predetermined time period T 13 , the air is discharged from the air cell groups  26 L and  26 R at substantially the same time as the rise to the predetermined speed S 2  of the rubbing driving source  9  to a predetermined pressure P 2  which is lower than the predetermined pressure p 1 , and the air cell groups  26 L and  26 R are maintained in this state. After the elapse of the predetermined time period T 13 , the rubbing driving source  9  is driven (normal rotation or reverse driving) at a predetermined speed S 3  which is higher than the predetermined speed S 2  for a predetermined time period T 14 , the air is discharged from the air cell groups  26 L and  26 R at substantially the same time as the rise to the predetermined speed S 3  of the rubbing driving source  9  to a predetermined pressure P 3  which is lower than the predetermined pressure p 2 , and the air cell groups  26 L and  26 R are maintained in this state. After the elapse of the predetermined time period T 14 , the rubbing driving source  9  is driven (normal rotation or reverse driving) at a predetermined speed S 4  which is higher than the predetermined speed S 1  and lower than the predetermined speed S 3 , the air is discharged from the air cell groups  26 L and  26 R at substantially the same time as the fall to the predetermined speed S 4  of the rubbing driving source  9  to a predetermined pressure P 4  which is lower than the predetermined pressure P 1  and higher than the predetermined pressure P 3  for a predetermined time period T 15 , and the air cell groups  26 L and  26 R are maintained in this state. 
     Although  FIG. 12(   a ) shows a configuration in which the rubbing driving source  9  is made to perform normal rotation driving in each of the predetermined time periods T 12  to T 15 , the rubbing driving source  9  may be made to perform only reverse driving or repeatedly perform the shifting between the normal rotation and the reverse driving. Alternatively, it is also applicable to gradually raise or lower the driving speed of the rubbing driving source  9  within a range from the speed  0  to each of the predetermined speeds S 1  to S 4  over the time elapse in each of the predetermined time periods T 12  to T 15 . 
     Although  FIG. 12(   a ) shows a configuration in which the air is supplied to the air cell groups  26 L and  26 R up to each of the predetermined pressures P 1  to P 4  and the air cell groups  26 L and  26 R are maintained in the expanding state, the expansion and the contraction may be repeatedly performed in each of the predetermined time periods T 12  to T 15 . For example, it is also applicable that the air cell groups  26 L and  26 R are made to repeat the expansion and the contraction within the range from the pressure  0  to each of the predetermined pressures P 1  to P 4  or repeat the expansion and the contraction such that the average value of the pressure becomes each of the predetermined pressures P 1  to P 4 . 
     According to this treatment pattern  5 , it is possible to gradually raise the speed of the rhythm in the massage performed on the body part and realize a warm-up operation which is effective right after waking up or the like. 
     As shown in  FIG. 12(   b ), the treatment pattern  6  is a pattern in which a state where the orbit action speed of the rubbing part  2  is high while the pressing force of the air cell groups  26 L and  26 R is small is gradually shifted to a state where the orbit action speed of the rubbing part  2  is low while the pressing force of the air cell groups  26 L and  26 R is strong. The control part  6  drives (normal rotation or reverse driving) the rubbing driving source  9  at a predetermined speed S 5  for a predetermined time period T 16 , supplies air to the air cell groups  26 L and  26 R at substantially the same time as the start of the driving of this rubbing driving source  9  up to a predetermined pressure P 5  for a predetermined time period T 16  and causes the air cell groups  26 L and  26 R to maintain it. After the elapse of the predetermined time period T 16 , the rubbing driving source  9  is driven (normal rotation or reverse driving) at a predetermined speed S 6  which is lower than the predetermined speed S 5  for a predetermined time period T 17 , the air is supplied to the air cell groups  26 L and  26 R at substantially the same time as the fall to the predetermined speed S 6  of the rubbing driving source  9  to a predetermined pressure P 6  which is higher than the predetermined pressure P 5  for a predetermined time period T 17 , and the air cell groups  26 L and  26 R are maintained in this state. After the elapse of the predetermined time period T 17 , the rubbing driving source  9  is driven (normal rotation or reverse driving) at a predetermined speed S 7  which is lower than the predetermined speed S 6  for a predetermined time period T 18 , the air is supplied to the air cell groups  26 L and  26 R at substantially the same time as the fall to the predetermined speed S 7  of the rubbing driving source  9  to a predetermined pressure P 7  which is higher than the predetermined pressure P 6  for a predetermined time period T 18 , and the air cell groups  26 L and  26 R are maintained in this state. After the elapse of the predetermined time period T 18 , the rubbing driving source  9  is driven (normal rotation or reverse driving) at a predetermined speed S 8  which is lower than the predetermined speed S 5  and higher than the predetermined speed S 7  for a predetermined time period T 19 , the air is discharged from the air cell groups  26 L and  26 R at substantially the same time as the rise to the predetermined speed S 8  of this rubbing driving source  9  to a predetermined pressure P 8  which is higher than the predetermined pressure P 5  and lower than the predetermined pressure P 7  for a predetermined time period T 19 , and the air cell groups  26 L and  26 R are maintained in this state. 
     Although  FIG. 12(   b ) shows a configuration in which the rubbing driving source  9  is made to perform normal rotation driving in each of the predetermined time periods T 16  to T 19 , the rubbing driving source  9  may be made to perform only reverse driving or repeatedly perform the shifting between the normal rotation and the reverse driving. Alternatively, the driving speed of the rubbing driving source  9  may be gradually raise or lower within a range from the speed  0  to each of the predetermined speeds S 5  to S 8  over time in each of the predetermined time periods T 16  to T 19 . 
     Although  FIG. 12(   b ) shows a configuration in which the air is supplied to the air cell groups  26 L and  26 R up to each of the predetermined pressures P 5  to P 8  and the air cell groups  26 L and  26 R are maintained in the expanding state in each of the predetermined time periods T 16  to T 19 , expansion and contraction may be repeatedly performed in each of the predetermined time periods T 16  to T 19 . For example, the air cell groups  26 L and  26 R may be made to repeat the expansion and the contraction within the range from the pressure  0  to each of the predetermined pressures P 5  to P 8  or repeat the expansion and the contraction such that the average value of the pressure becomes each of the predetermined pressures P 5  to P 8 , in each of the predetermined time periods T 16  to T 19 . 
     According to this treatment pattern  6 , it is possible to gradually lower the speed of the rhythm of the massage performed on the body part and realize a cool-down action which is effective before sleeping or the like. 
     Second Embodiment 
     Hereinafter, description will be made of the configuration of the massage machine M 2  according to the second embodiment of the present invention with reference to  FIGS. 13 to 18 . The same reference numerals are used for the same configurations as those in the massage machine M 1  according to the first embodiment, and the massage machine M 2  provided in the armrest part  104  will be described as a representative.  FIG. 13  is a front perspective view of the massage machine M 2 ,  FIG. 14  is a front perspective view of the massage machine M 2  in which the massage part is omitted,  FIG. 15  is a front view of the massage machine M 2  in which a part of the base part  4  is omitted,  FIG. 16  is a left side view of the massage machine M 2 ,  FIG. 17  is a front perspective view of the massage machine M 2  in which a part of the rubbing part  2  is omitted, and  FIG. 18  is a front perspective view showing the main parts of the power transmission part  8  in the massage machine M 2 . 
     [Overall Configuration of Massage Machine] 
     As shown in  FIGS. 13 to 15 , the massage machine M 2  is constituted by a rubbing unit  1  including rubbing parts  2  which perform a rubbing massage on each side surface of both arms of the person to be treated and a rubbing driving part  3  which drives these rubbing parts  2 , and base parts  4  which are arranged on the upper surfaces of the armrest parts  104  to support the rubbing unit  1 . 
     [Configuration of Base Part] 
     As shown in  FIG. 17 , the base part  4  has a configuration in which the upper side thereof is opened by a plate-shaped bottom portion  4   a , plate-shaped side portions  4   b  and  4   b  provided so as to stand on both left and right sides of the bottom portion  4   a , a plate-shaped front portion  4   c  provided so as to stand on the front side of the bottom  4   a , and a plate-shaped back portion  4   d  provided so as to stand on the back side of the bottom portion  4   a . The rubbing part  2  is movably supported at the left and right side portions  4   b  and  4   b  of the base part  4  through a power transmission part  8  which will be described later. In addition, the power transmission part  8  and the rubbing driving source  9  constituted by a motor and the like which drives the rubbing part  2  through the power transmission part  8  are supported at the bottom portion  4   a  of the base part  4 . In addition, guide holes  54  and  54  which open in the horizontal direction of the longer dimension are provided at the other end side (the back end portion in this embodiment) of both side portions  4   b  and  4   b  of the base part  4  in the longitudinal direction of the arms so as to restrict the rotation movement of the rubbing part  2 , which will be described later. 
     [Configuration of Rubbing Part] 
     As shown in  FIGS. 13 to 15 , the rubbing part  2  is constituted by a plate-shaped coupling part  50  which is supported by the base part  4  through the power transmission part  8  and coupled to the power transmission part  8  so as to be able to be displaced in the vertical and the front-back directions, a plate-shaped first rubbing part  12  which is supported by the coupling part  50  and includes a facing inner side surface  12   a  facing the outer surface of the arm, and a plate-shaped second rubbing part  13  which is integrally configured with the first rubbing part  12 , provided so as to extend from the lower end portion of the first rubbing part  12  to the horizontal inner side, and includes a facing inner bottom surface  13   a  facing the back surface of the arm, where a pair of left and right rubbing part  2  is provided at both side portions  46  and  46  of the base part  4 . 
     The first rubbing parts  12  and  12  and the second rubbing parts  13  and  13  included in the pair of left and right rubbing parts  2  constitute a recessed portion M 2   a  for containing the arm, which opens at the upper side thereof and the both ends in the front-back direction, and both side surfaces of the arm contained in this recessed portion M 2   a  are supported by the first rubbing parts  12  and  12  while the back surface of the arm is supported by the second rubbing parts  13  and  13 . 
     As shown in  FIGS. 14 and 15 , the first rubbing part  12  has a substantially rectangular shape when viewed from the side with a longer dimension along the front-back direction (the longitudinal direction of the arms), and the facing inner surface  12   a  of the first rubbing part  12  is an inclined surface in which the lower end side is slightly inclined inwardly. In addition, the first rubbing part  12  has air cells  7  which press the external surface of the arm of the person to be treated, which will be described later, and a plurality of air cells  7  is provided in the facing inner side surfaces  12   a  of the first rubbing part  12  along the front-back direction (the longitudinal direction of the arms). The air cells  7  are connected to the air supply/discharge apparatus  5  through the air piping (not shown) so as to be able to expand and contract by the supply and discharge of the air. 
     As shown in  FIGS. 14 and 15 , the second rubbing part  13  has a substantially rectangular shape when viewed from the upper side with a longer dimension along the front-back direction (the longitudinal direction of the arms), the facing inner bottom surface  13   a  of the second rubbing part  13  is an inclined surface in which the inner end side is slightly inclined downwardly, and each of the pair of left and right second rubbing parts  13  and  13  is arranged so as to be close to each other such that the arm does not fall into the space between both second rubbing parts  13  and  13 . In addition, the second rubbing part  13  includes a reinforcing part  51  which is provided in the external bottom surface  13   b  as the rear side surface of the facing inner bottom surface  13   a  of the second rubbing part  13  and couples the second rubbing part  13  and the coupling part  50  to resist the load on the arms. In addition, the second rubbing part  13  includes a treatment protrusion  52  which applies shiatsu from the back surface to the side surface of the arm, and this treatment protrusion  52  is provided in the facing inner bottom surface  13   a  of the second rubbing part  13  so as to have a configuration with a sheet shape made of synthetic resin or the like with a longer dimension along the longitudinal direction of the arms to the extent to which the lower portion of the facing inner side surface  12   a  of the first rubbing part  12  and the facing inner bottom surface  13   a  of the second rubbing part  13  are covered. 
     As shown in  FIG. 15 , the pair of left and right rubbing parts  2  and  2  is integrally covered with the cover part  16  with a surface constituted by a cloth or the like with the stretch surface so as to prevent the rubbing parts  2  from being exposed to the outside and reduce the risk of the arm being trapped between both second rubbing parts  13  and  13 . 
     As shown in  FIGS. 15 to 17 , the coupling part  50  is configured to have a plate shape with an inner surface  50   a  facing the external surface  12   b  as the back side surface of the facing inner side surface  12   a  of the first rubbing part  12 , and the power transmission part  8  which causes the rubbing part  2  to act, which will be described later, is coupled to the coupling part  50  at the front end lower portion thereof from the inner side surface  50   a . In addition, a rod-shaped guide shaft  53  which protrudes outwardly from the external side surface  50   b  is provided at the back end portion of the coupling part  50 , and this guide shaft  53  is inserted into the guide hole  54  which is provided in the side portion  4   b  of the base part  4  and includes an opening with a longer dimension in the longitudinal direction of the arms. The guide shaft  53  can be relatively displaced in the front-back direction along the longitudinal direction of the guide hole  54  and is rotatably supported with respect to the guide hole  54 . 
     As shown in  FIG. 16 , the coupling part  50  includes a restriction part  55  which restricts the displacement of the base part  4  in the horizontal direction (the direction perpendicular to the side surface of the arm), and this restriction part  55  is provided in the upper end portion of the coupling part  50 . Since the restriction part  55  has a similarly longer dimension as that of the coupling part  50  in the front-back direction, the restriction part  55  has a longer dimension in the front-back direction (the longitudinal direction of the leg) and further a predetermined thickness in the horizontal direction, and is provided with a pair of front and back guide holes  56 , which opens in the vertical direction, in the lower portion of the restriction portion  55 . A pair of front and back guide protrusions  57  which is included in the side portion  4   b  of the base part  4  and protrudes upwardly is inserted in the guide holes  56  from the lower side, and the guide protrusions  57  are substantially mound-shaped in which the center in the front-back direction protrudes upwardly as compared with both end portions. Since the linear dimension of the guide hole  56  in the front-back direction is maintained to be greater than the linear dimension of the guide protrusion  57  in the front-back direction, the displacement of the coupling part  50  with respect to the base part  4  is allowed in the front-back direction and vertical direction while restricted in the horizontal direction. 
     [Configuration of Rubbing Driving Part] 
     Hereinafter, description will be made of a configuration of the rubbing driving part  3  with reference to  FIGS. 17 and 18 . 
     As shown in  FIGS. 17 and 18 , the rubbing driving part  3  includes a rubbing driving source  9  such as a motor and the like driven by the control part  6  and a power transmission part  8  which transmits the rotation power of the rubbing driving source  9  to cause the rubbing part  2  to act, and the rubbing driving part  3  is provided in the base part  4 . The output axis of the rubbing driving source  9  is provided along the front-back direction (the longitudinal direction of the arms), and the power transmission part  8  includes a gear case  17  with a worm gear to change the rotation direction of the output axis of the rubbing driving source  9  for deceleration, a transmission shaft  18  which is connected to this worm gear and rotated about an axial center directed towards the horizontal direction (the width direction of the arms), and a shaft support part  58  which supports both left and right end portions of the transmission shaft  18  at the rubbing part  2 . This transmission shaft  18  is rotatably supported on the one end side (the front end portion in this embodiment) in the front-back direction of the base part  4 . In this embodiment, the rubbing driving source  9  is constituted by a motor, and the rotation direction and the rotation speed of the output axis thereof are configured to be variable by the control part  6 . 
     The shaft support part  58  includes an eccentric cam  59  attached to the transmission shaft  18 , which will be described later, a bearing  60  provided in the outer circumferential portion of the eccentric cam  59 , and a holder  61  which attaches the eccentric cam  59  to the coupling part  50  included in the rubbing part  2  through the bearing  60 . A pair of left and right eccentric cams  59  and  59  which causes the rubbing part  2  to act is provided in both the left and right end portions of this transmission shaft  18 , and the eccentric cam  59  is attached to the transmission shaft  18  so as to be integrally rotatable with the transmission shaft  18 . 
     Such eccentric cams  59  have disk shapes with a thickness in the horizontal direction, and a rotation axis center  59   a  is provided at a position distant from the center of the geometric circle of the outer shape such that the left and right end portions of the transmission shaft  18  coincide with the rotation axis centers  59   a  and  59   a  of the pair of left and right eccentric cams  59  and  59 . A ring-shaped bearing  60  is externally fitted onto the outer circumferential portion of the eccentric cam  59  such that the eccentric cams  59  are rotatably supported by the holders  61  through the bearings  60 , and the holders  61  are attached to the inner surfaces  50   a  and  50   a  of the coupling portions  50  and  50  included in each rubbing part by a coupling means (not shown) such as a bolt or the like. In addition, each of the pair of left and right eccentric cams  59  and  59  has mutually different phases with respect to the rotation axis center  59   a . In the second embodiment, the phases of the pair of left and right eccentric cams  59  and  59  with respect to the rotation axis center  59   a  are different from each other by 180°. 
     [Configuration of Massage Part] 
     Hereinafter, description will be made of the configuration of the massage part included in the rubbing part  2  with reference to  FIG. 13 . 
     As shown in  FIG. 13 , an air cell  7  which expands and contracts due to the supply and the discharge of the air is employed as the massage part in this embodiment, which performs a massage on the body part of the person to be treated. The air cells  7  are provided in the facing inner surfaces  12   a  and  12   a  of the pair of left and right first rubbing parts  12  and  12 , have substantially flat shapes in the side view during the contraction, and are expanded inwardly in the horizontal direction during the expansion when air is supplied from the air supply/discharge apparatus  5 . In addition, it is also applicable that these air cells  7  have an undevelopable base part with a lower portion attached to the facing inner surfaces  12   a  of the first rubbing parts  12  and a developing part with an upper portion which can be developed inwardly in the horizontal direction such that these air cells  7  have substantially flat shapes in the side view during the contraction and the developing part is expanded and developed inwardly in the horizontal direction in an accordion-like manner with respect to the base part during the expansion when air is supplied from the air supply/discharge apparatus  5 . 
     The air cell group  26  which presses the both side surfaces of the arms is constituted by the pair of left and right air cells  7 , a plurality of air cell groups  26 L and  26 R is provided in the front-back direction (the longitudinal direction of the legs), and it is possible to press both legs with the plurality of air cell groups  26 L and  26 R in accordance with the change in thickness of the legs in the longitudinal direction. Accordingly, when the air supply/discharge apparatus  5  is driven by the output signal from the control part  6 , and air is supplied to the plurality of air cell groups  26 , the pressing massage is performed on the arms due to the expansion of the air cells  7 , and the intervals of the recessed portions M 2   a  which contain the arms are adjusted to the intervals corresponding to the size of the arms of the person to be treated. 
     [Actions of Rubbing Part] 
     Hereinafter, description will be made of the actions of the rubbing part  2  with reference to  FIG. 19 .  FIG. 19  is a left side view showing the main parts of the rubbing part  2  of the massage machine M 2 , which illustrates the actions of the rubbing part  2 . 
     When the rubbing driving source  9  is driven, and the output shaft of the rubbing driving part  3  with the aforementioned configuration is rotated, the transmission shaft  18  provided on one end side (the front end portion in this embodiment) in the front-back direction of the base part  4  is rotated about the axial center in conjunction with the rotation of the output shaft through the gear case  17 , and the eccentric cams  59  and  59  attached to both the left and right end portions of the transmission shaft  18  revolves about the rotation axis center of the transmission shaft  18 . Then, the holder  61  provided in the lower portion on the one end side in the front-back direction of the coupling part  50  that supports the eccentric cam  59  is made to perform a circular movement along the revolution track of the eccentric cam  59  due to the revolution of the eccentric cam  59 . On the other hand, since the guide shaft  53  provided on the other end side in the front-back direction of the coupling part  50  is inserted into the guide holes  54  and  54  provided in both sides  4   b  and  4   b  of the base part  4 , the circular movement of the coupling part  50  itself is restricted regardless of the circular movement of the holder  61 . As a result, the coupling part  50  is reciprocated once in the front-back direction by a predetermined distance and performs an orbiting action for inclination in the front-back direction while the transmission shaft  18  is rotated once. Accordingly, the rubbing part  2  performs the orbiting action for the inclination in the front-back direction during one reciprocation in the front-back direction by the predetermined distance along with the aforementioned action. 
     At this time, a fixed point  12 A positioned substantially at the center of the first rubbing part  12  included in the rubbing part  2  in the side view orbits along a substantially oval-shaped track  12 B with a longer dimension in the front-back direction while a fixed point  12 C positioned at the back portion of the upper end of the first rubbing part orbits along a substantially oval-shaped track  12 D with a longer dimension than that of the track of the fixed point  12 A. In addition, since the second rubbing part  13  included in the rubbing part  2  is integrally configured with the first rubbing part  12 , the second rubbing part  13  performs an orbiting action for inclination in the front-back direction while being reciprocated once in the front-back direction by a predetermined distance in conjunction with the orbiting of the first rubbing part  12 . Moreover, the rubbing driving source  9  of the rubbing driving part  3  is electrically connected to the control part  6  through a drive circuit (not shown), and the action thereof is controlled by an electric signal output from the drive circuit based on the control signal from the control part  6 . 
     Incidentally, each of the pair of left and right eccentric cams  59  and  59  has phases which are different from each other by 180° as described above. Accordingly, the phases of the pair of left and right orbiting rubbing parts  2  and  2  are different from each other by 180°, and therefore, the rubbing parts  2  and  2  are displaced in opposite directions. That is, one rubbing part  2  is displaced to one side (front side) in the front-back direction while the other rubbing part  2  is displaced to the other side (back side) in the front-back direction, and one end side (front end portion) of the one rubbing part  2  in the front-back direction is displaced to one side (upward) in the vertical direction and the other end side (back end portion) in the front-back direction is displaced to the other side (downward) in the vertical direction while one end side (front end portion) of the other rubbing part  2  in the front-back direction is displaced to the other side (downward) in the vertical direction and one end side (back end portion) in the front-back direction is displaced to the other side (upward) in the vertical direction. 
     [Treatment Pattern] 
     The massage machine M 2  according to the second embodiment can execute the same treatment patterns  1  to  6  as those in the aforementioned massage machine M 1  according to the first embodiment. 
     [Other Embodiments of Massage Machine] 
     The aforementioned massage machines M 1  and M 2  according to the first and second embodiments are not limited to the configurations shown in the drawing and may be differently configured within the scope of the present invention. Although description will be made hereinafter of a case in which other embodiments of the massage machines M 1  and M 2  are applied to the massage machine M 1  as a representative, the application can also be made for the massage machine M 2  according to the second embodiment in the same manner. 
     Although  FIG. 1  shows the massage machine M 1  with the configuration applied to the chair type massage machine  100 , it is also possible to configure the massage machine M 1  to be mounted on the mounting surface such as a floor surface or the like and used in an independent state from the chair type massage machine  100 . In such a case, the air supply/discharge apparatus  5  and the control part  6  are arranged on the bottom portion  4   a  or the like of the base part  4 . In a configuration in which this massage machine M 1  is used in an independent state from the chair-type massage machine  100 , it is possible to provide an angle adjustment mechanism  190  which changes the angle between the bottom portion  4   a  of the base part  4  and the mounting surface F such as a floor surface or the like on which the massage machine M 1  is mounted. Hereinafter, description will be made of this angle adjustment mechanism  190  with reference to  FIG. 20 .  FIG. 20(   a ) is a back perspective view of the massage machine M 1 , which illustrates one example of the angle adjustment mechanism  190 , and  FIG. 20(   b ) is a left side view of the massage machine M 1 , which illustrates another example of the angle adjustment mechanism  190 . 
     As shown in  FIG. 20(   a ), one example of the angle adjustment mechanism  190  is constituted by a support part  200  which is rotatably coupled to the other end portion (back end portion) of the base part  4  in the front-back direction. This support part  200  includes a pair of left and right side portions  200   a  and  200   a  which is rotatably supported by both side portions  4   b  and  4   b  of the base part  4  through the rotation axis  201  in the horizontal direction and has a longer length in the front-back direction in a state in which the bottom portion  4   a  of the base part  4  is grounded on the mounting surface F and a coupling portion  200   b  which couples the one end portion (front end portion) in the front back direction, can be grounded on the mounting surface F, and has a longer length in the horizontal direction, where both side portions  200   a  and  200   a  and the coupling portion  200   b  are integrally configured. In a state in which the bottom portion  4   a  is grounded on the mounting surface F, the both side portions  200   a  and  200   a  of the support part  200  are respectively positioned outside both side portions  4   b  and  4   b  of the base part  4 , and the coupling portion  200   b  of the support part  200  is positioned in front of the front portion  4   c  of the base part  4 . It is possible to change the angle between the bottom portion  4   a  of the base part  4  and the mounting surface F by rotating backward (in the direction of an arrow c) the other end portion (back end portion) of the support part  200  in the front-back direction from a state shown by a solid line to a state shown by a two-dot chain line in  FIG. 20(   a ) and causing the coupling portion  200   b  to be grounded on the mounting surface F. In addition, it is possible to position the support part  200  at an arbitrary position between the state shown by the solid line to the state shown by the two-dot chain line in  FIG. 20(   a ) and to arbitrarily change the angle between the bottom portion  4   a  of the base part  4  and the mounting surface F by providing a lock mechanism (not show) which locks the rotation of this support part  200 . 
     As shown in  FIG. 20(   b ), another example of the angle adjustment mechanism  190  is configured by a base support part  202  which supports the base part  4  and an air cell  203  interposed between the bottom portion  4   a  of the base part  4  and the base support part  202 . This base support part  202  is configured to have a plate shape with surfaces in the vertical direction such that the bottom portion  4   a  of the base part  4  can be mounted on the upper surface  202   a  while the lower surface  202   b  can be grounded on the mounting surface F, and one end portion (front end portion) of the base part  4  in the front-back direction is rotatably supported by the one end portion (front end portion) of the base support part  202  in the front-back direction through the rotation axis  204  in the horizontal direction. The air cell  203  is provided on the upper surface  202   a  of the base support part  202  and has a substantially flat shape during the contraction as shown by the solid line, and the other end portion (the back end portion in the front-back direction) is developed in a fan shape during the expansion as shown by the two-dot chain line. Accordingly, it is possible to arbitrarily change the angle between the bottom portion  4   a  of the base part  4  and the base support part  202  (that is, the mounting surface F) by appropriately adjusting the level of expansion of the air-cell  203 . In addition, the expansion and the contraction of the air cell  203  is performed by the supply and the discharge of the air by the aforementioned air supply/discharge apparatus  5 . 
     In addition, although the air cell  7  included in the massage machine M 1  is configured to be arranged only in the facing inner surface  12   a  of the first rubbing part  12  included in the external rubbing part  10  and in the facing inner surfaces  14   a  and  14   a  of the first rubbing part  14  included in the intermediate rubbing part  11 , the air cell  7  may also be arranged in the facing inner bottom surface  13   a  of the second rubbing part  13  included in the external rubbing part  10  and/or in the facing inner bottom surfaces  15   a  and  15   a  of the second rubbing part  15  included in the intermediate rubbing part  11 . In addition, another configuration is also applicable in which the air cell  7  is only provided to a facing inner surface of either one of the first rubbing part  12  and the first rubbing part  14 . 
     In addition, the massage part included in the rubbing part  2  may have a configuration other than the air cell  7 . Hereinafter, description will be made of another configuration of the massage part with reference to  FIG. 21 .  FIG. 21  is a front perspective view of the massage machine M 1 , which illustrates another configuration of the massage machine. 
     As shown in  FIG. 21 , rollers  205  which are rotated and moved on the side surface of a body part (legs) of a person to be treated are provided in the facing inner surfaces  12   a  and  14   a  of the first rubbing part  12  and  14  instead of the air cells  7  provided in the first rubbing parts  12  and  14 . The roller  205  includes a rotation axis  206  extending in the vertical direction, and rotates in the front-back direction (the longitudinal direction of the body part) such that a contact surface  205   a  of the roller  205  to the body part rubs the side surface of the body part by the orbiting action of the rubbing part  2 . In addition, a plurality of rollers  205  is provided along the front-back direction. 
     Moreover, it is needless to say that the rollers  205  can also be provided in the facing inner bottom surfaces  13   a  and  15   a  of the second rubbing parts  13  and  15 , and the roller  205  has a rotation axis extending in the horizontal direction and rotates in the front-back direction (the longitudinal direction of the body part), and the contact surface of the roller to the body part rubs the back surface of the body part by the orbiting action of the rubbing part  2  when the rollers  205  are provided in the second rubbing parts  13  and  15 . 
     The aforementioned rubbing massage machines M 1  and M 2  according to the first and second embodiments are respectively provided with a strength adjustment part  70  which adjusts the pressing force of the air cell  7  to the body part of the person to be treated. Hereinafter, description will be made of the configurations of the strength adjustment parts  70 ,  80 , and  90  with reference to  FIGS. 22 to 27 . Although the following description will be made of a configuration in which the strength adjustment parts  70 ,  80 , and  90  are provided in the rubbing massage machine M 1  according to the first embodiment as a representative, it is also possible to provide the strength adjustment parts  70 ,  80 , and  90  in the massage machine M 2  according to the second embodiment in the same manner. 
       FIG. 22  is a functional block diagram of the strength adjustment part (version 1)  70 , which illustrates the configuration of the detection part  71  according to the first embodiment.  FIG. 23  is a functional block diagram of the strength adjustment part (version 2)  70 , which illustrates the configuration of the detection part  71  according to the second embodiment.  FIG. 24  is a front view schematically showing the massage machine M 1 , which illustrates the configuration of the detection part  71  according to the second embodiment included in the strength adjustment part (version 1)  70 .  FIG. 25(   a ) is a front view schematically showing the external rubbing part  10  of the massage machine M 1  in a state in which the air cell  7  is contracted, which illustrates the configuration of the detection part  71  according to the third embodiment included in the strength adjustment part (version 1)  70 .  FIG. 25(   b ) is a front view schematically showing the external rubbing part  10  of the massage machine M 1  in a state in which the air cell  7  is expanded, which illustrates the configuration of the detection part  71  according to the third embodiment included in the strength adjustment part (version 1)  70 .  FIG. 26  is a front perspective view schematically showing the massage machine M 1 , in which the rubbing part  2  is omitted, which illustrates the configuration of the strength adjustment part (version 2)  80 .  FIG. 27  is a front view of the massage machine M 1 , which illustrates the configuration of the strength adjustment part (version 3)  90 . 
     [Configuration of Strength Adjustment Part (Version 1)] 
     As shown in  FIGS. 22 and 23 , the strength adjustment part (version 1)  70  is constituted by the control part  6 , the air supply/discharge part  5 , and the detection part  71  which detects the pressing force of the air cell  7  with respect to the body part and is configured to adjust the amount of supplied and discharged air to and from the air cell  7  based on the detection result of the detection part  71 . The air supply/discharge apparatus  5  is constituted by a pump  5   a  and a valve  5   b  and connected to the valve  5   b  as an independent system from the air cell groups  26 L and  26 R constituted by the air cells  7  and  7  on the one end side (front side) in the front-back direction and the air cell groups  26 L and  26 R constituted by the air cells  7  and  7  on the other end side (back side) in the front-back direction. In addition, this valve  5   b  may be a valve constituted by a solenoid valve or the like which shifts only between the air supply state and the air discharge state or may be a valve constituted by a rotary valve or the like which can shift between the air supply state and the air discharge state and shift a plurality of air supply states at different speeds at which the air is supplied to the air cell  7 , by allowing the diameter of the output port from the valve to be variable. In the memory of the control part  6  is stored a plurality of predetermined pressing forces F, and a setting is respectively made such that the “weak” pressing force corresponds to the predetermined pressing force F 1 , the “intermediate” pressing force corresponds to the predetermined pressing force F 2 , and the “strong” pressing force corresponds to the predetermined pressing force F 3 . This predetermined pressing force F can be set by a person to be treated operating the operation part  108  or can be automatically set based on an automatic massage program stored in the memory of the control part  6 . 
     Here, “the pressing force F of the air cell  7  with respect to the body part, which is detected by the detection part  71 ” is defined by a pressure within the air cell  7  and the air piping connected to the inside of the air cell  7 , the contact pressure to the outside of the air cell  7 , or the amount of the air flowing inside the air cell  7  and the air piping. 
     As shown in  FIG. 22 , the detection part  71  according to the first embodiment is constituted by a pressure sensor  71   a  such as a strain gauge or the like which detects the inner pressure of the air cell  7  and the inner pressure of the air piping  72  which connects the air cell  7  and the air supply/discharge apparatus. The pressure sensor  71   a  is provided in the air piping  72   a  interposed between the air cell  7  and the valve  5   b , and more specifically, provided independently in the air piping  72   a  interposed between the air cell groups  26 L and  26 R and the valve  5   b  on the front side and in the air piping  72   a  interposed between the air cell groups  26 L and  26 R and the valve  5   b  on the back side. Accordingly, it is possible to independently detect the pressing force of the air cell groups  26 L and  26 R on the front side and the pressing force of the air cell groups  26 L and  26 R on the back side with the pressure sensor  71   a , and to individually control the amount of the supplied and discharged air to and from the air cell groups  26 L and  26 R on the front side and the amount of the supplied and discharged air to and from the air cell groups  26 L and  26 R on the back side based on the detection result of the pressure sensor  71   a , and therefore, it is possible to effectively perform a massage on body parts such as arms, legs, and the like with different diameters in the longitudinal direction. In addition, the pressure sensor  71   a  may be provided in the air piping  72   b  interposed between the pump  5   a  and the valve  5   b , and it is possible to reduce the number of the pressure sensors  71   a  in such a case. Moreover, the pressure sensor  71   a  may be integrally configured with the valve  5   b  and provided in the connection part  5   b   1  with the air piping  72   b  connected to the pump  5   a  or the connection part  5   b   2  with the air piping  72   a  connected to the air cell  7 , and it is possible to downsize the strength adjustment part  70  in such a case. Furthermore, the detection part  71  may be configured by a flow rate sensor which detects the amount of air sent into the air cell  7  and provided in a discharge part  5   a   1  of the pump  5   a  or the air piping  72  in such a case. 
     As shown in  FIG. 24 , the detection part  71  according to the second invention is configured by a pressure-sensitive sensor  71   b  formed to have a flexible sheet shape, which detects the contact pressure from the body part to the air cell  7 . The pressure-sensitive sensors  71   b  are provided on the contact surfaces of the air cells  7  with respect to the body part and individually provided in the air cell  7  on the front side and the air cell  7  on the back side as shown in  FIG. 23 . Accordingly, it is possible to individually detect the pressing force of the air cell groups  26 L and  26 R on the front side and the pressing force of the air cell groups  26 L and  26 R on the back side with the pressure-sensitive sensor  71   b  and individually control the amount of supplied and discharged air to and from the air cell groups  26 L and  26 R on the front side and the amount of the supplied and discharged air to and from the air cell groups  26 L and  26 R on the back side based on the detection result of the pressure-sensitive sensor  71   b , and therefore, it is possible to effectively perform a massage on body parts such as legs, arms, and the like with different diameters in the longitudinal direction. In addition, this pressure-sensitive sensor  71   b  may be provided so as to be interposed between the first rubbing parts  12  and  14  and the air cell  7  (that is, in the facing inner surfaces  12   a  and  14   a  of the first rubbing parts  12  and  14 ). When the detection part  71  is constituted by the pressure-sensitive sensor  71   b , it is possible to adjust to a desired pressing force regardless of the sizes (diameters) of the body parts which are different depending on the persons to be treated. In addition, the detection part  71  may be constituted by a deformation sensor which is integrally configured with the air cell  7  for detecting the deformation of the air cell  7  or may be constituted by a sweat sensor which is provided on the contact surface of the air cell  7  with respect to the body part to detect the sweating amount of the person to be treated. 
     As shown in  FIG. 25(   a ), the detection part  71  according to the third embodiment is constituted by a potentiometer  71   c  which detects the level of the expansion of the air cell  7  in the horizontal direction. The potentiometer  71   c  is constituted by a stretch member  73  such as a wire or the like which includes one end portion coupled to the lower portion of the facing inner surface  12   a  of the first rubbing part  12  included in the external rubbing part  10  and is provided so as to extend up to the external surface  12   b  of the first rubbing part  12  over the contact surface of the air cell  7  with respect to the body part, a detected body  74  which is provided in the other end portion of the stretch member  73  so as to be displaceable in the vertical direction, and a detecting body  75  which is provided in the external surface  12   b  of the first rubbing part  12  included in the external rubbing part  10  for detecting the position (vertical position) of the detected body  74 . The lower end portion of this detected body  74  is always biased downwardly by a bias part  76  such as a spring. As shown in  FIG. 25(   b ), the detected body  74  coupled to the stretch member  73  is displaced upwardly against the bias force of the bias part  76  when the air cell  7  is expanded in the horizontal direction, and the detecting body  75  detects the level of the expansion of the air cell  7  by detecting the position of the detected body  74 . The potentiometers  71   c  are individually provided in the air cell  7  on the front side and in the air cell  7  on the back side. Accordingly, it is possible to individually detect the pressing force of the air cell groups  26 L and  26 R on the front side and the pressing force of the air cell groups  26 L and  26 R on the back side with the potentiometer  71   c  and individually control the amount of the supplied and discharged air to and from the air cell groups  26 L and  26 R on the front side and the amount of the supplied and discharged air to and from the air cell groups  26 L and  26 R on the back side based on the detection result of the potentiometer  71   c , and therefore, it is possible to effectively perform a massage on body parts such as legs, arms, and the like with different diameters in the longitudinal direction. 
     The strength adjustment part  70  including the detection part  71  according to the embodiments 1 to 3 controls the air supply/discharge apparatus  5  so as to achieve the set predetermined pressing force F and adjusts the amount of the supplied and discharged air to and from the air cell  7 . Specifically, the control part  6  continues the detection of the pressing force with the detection part  71  for a predetermined time period, performs the supply and the discharge of the air to and from the air cell  7  until the average value of the pressing force detected by the detection part  71  in the predetermined time period reaches the set predetermined pressing force F, stops the supply and the discharge of the air after the elapse of the predetermined time period, and controls the air supply/discharge apparatus  5  so as to maintain the predetermined pressing force F of the air cell  7 . With such a configuration, it is possible to set the air cell  7  to have a desired pressing force even when the rubbing part  2  is acting while the position of the air cell  7  with respect to the body part of the person to be treated is changed during the action of the rubbing part  2  by the rubbing driving part  3 . 
     [Configuration of Strength Adjustment Part (Version 2)] 
     As shown in  FIG. 26 , the strength adjustment part (version 2)  80  is configured by a width adjustment means for changing the position of the rubbing part  2  in the horizontal direction and adjusting the interval of the recessed portion M 1   a  (see  FIG. 4 ) in the horizontal direction, and the width adjustment means is configured by a positioning part  81  which displaces the eccentric cam  21  supported by the transmission shaft  18  in the axial direction (the horizontal direction) of the transmission shaft  18  and positions the eccentric cam at an arbitrary position in the axial direction of the transmission shaft  18 . This positioning part  81  is configured by a slide bush made of an elastic member such as rubber or the like, which is fitted into the through hole  21   d  of the eccentric cam  21  so as to be able to slide and position the rubbing part  2  with respect to the transmission shaft  18  through the eccentric cam  21 . 
     [Configuration of Strength Adjustment Part (Version 3)] 
     As shown in  FIG. 27 , the strength adjustment part (version 3)  90  is configured by a width adjustment means for changing the position of the air cell  7  in the horizontal direction and adjusting the interval between the air cell  7  provided in the first rubbing part  12  included in the external rubbing part  10  and the air cell  7  provided in the first rubbing part  14  included in the intermediate rubbing part  11  in the horizontal direction, and the width adjustment means is configured by an air cell  91  for width adjustment interposed between the air cell  7  as the massage part and the first rubbing parts  12  and  14 . This air cell  91  for width adjustment is provided in the facing inner surfaces  12   a  and  14   a  of the first rubbing parts  12  and  14  included in the pair of external rubbing parts  10  and  10  and the intermediate rubbing part  11  in the same manner as the air cell  7  as the massage part, has a substantially flat shape in the side view during the contraction, and expands inwardly in the horizontal direction during the expansion when the air is supplied from the air supply/discharge apparatus  5 . In addition, this air cell  91  for width adjustment may include an undevelopable base part whose lower portion is attached to the facing inner surfaces  12   a  and  14   a  of the first rubbing parts  12  and  14  and a developing part whose upper portion can be developed inwardly in the horizontal direction, have a substantially flat shape in the side view during the contraction, and the developing part may be expanded and developed inwardly in the horizontal direction in an accordion-like manner with respect to the base part during the expansion when air is supplied from the air supply/discharge apparatus  5 . This air cell  91  for width adjustment and the air cell  7  are connected to the valve  5   b  as independent systems. 
     INDUSTRIAL APPLICABILITY 
     The present invention can be applied to a massage machine capable of individually performing a rubbing action and a pressing action at different positions on the back surface of a body part of a person to be treated while performing a rubbing action on the side surface of the body part. 
     REFERENCE SIGNS LIST 
     
         
           1 : rubbing unit 
           2 : rubbing part 
           3 : rubbing driving part 
           4 : base part 
           7 : massage part (air cell) 
           8 : power transmission part 
           9 : rubbing driving source 
           10 : external rubbing part 
           11 : intermediate rubbing part 
           12 ,  14 : first rubbing part 
           13 ,  15 : second rubbing part 
           50 : restriction part 
           70 ,  80 ,  90 : strength adjustment part 
           71 : detection part 
           81 : positioning part 
           91 : air cell for width adjustment 
           100 : chair type massage machine 
           101 : seat part 
           102 : backrest part 
           103 : footrest 
           104 : armrest part 
           190 : angle adjustment mechanism 
           205 : massage part (roller) 
         D 1 , D 2 , D 3 , D 4 : predetermined dimension 
         M 1 , M 2 : massage machine 
         M 1   a , M 2   a : recessed portion