Patent Publication Number: US-9896873-B2

Title: Tension applying apparatus, drum apparatus and opening and closing body drive apparatus for vehicle

Description:
TECHNICAL FIELD 
     The present invention relates to a tension applying apparatus, a drum apparatus and an opening and closing body drive apparatus for a vehicle. 
     BACKGROUND ART 
     A tension applying apparatus is normally provided at an opening and closing body drive apparatus for a vehicle that drives an opening and closing body with a drive cable. The tension applying apparatus may apply a tensile force to the drive cable. For example, a slide door apparatus disclosed in Patent document 1 includes two drive cables pulling a slide door of the slide door apparatus in an opening direction and a closing direction. A tension applying apparatus provided at the slide door apparatus is provided at a drum apparatus which is configured to reel in one of the two drive cables while reeling out the other of the two drive cables. 
     That is, the tension applying apparatus is provided at the drum apparatus so as to absorb looseness generated at the drive cable which is reeled out. The slide door may be smoothly pulled accordingly. 
     Specifically, in many cases, the tension applying apparatus as described above, for example, is configured to apply the tensile force to the drive cable by biasing a tension applying member based on an elastic resilience of a spring member to press the tension applying member against the drive cable. For example, in the tension applying apparatus disclosed in Patent document 1, a pulley is employed as the tension applying member. In addition, the tension applying apparatus includes a guide portion (guide groove) extending in a direction intersecting with the drive belt. A movement of the pulley along the guide groove is allowed to thereby apply an appropriate tensile force to the drive cable against which the pulley is pressed. 
     Further, a bent portion is provided at a base end side of the guide groove so that a rotation shaft of the pulley which is inserted to be positioned within the guide groove is engageable with the guide groove. That is, the tension applying member is engaged so that a biasing force stored at the spring member is inhibited from being transmitted to the drive cable. In the aforementioned known tension applying apparatus, by the use of such construction, the pulley may be retained at a position where a force for pressing the pulley against each of the drive cables is weakened. As a result, in a case where the drive cables are connected to the slide door, it is constructed that an amount of looseness of each of the drive cables increases to thereby simplify the connection operation of the drive cables. 
     DOCUMENT OF PRIOR ART 
     Patent Document 
     
         
         Patent document 1: JP2004-300827A 
       
    
     OVERVIEW OF INVENTION 
     Problem to be Solved by Invention 
     Nevertheless, according to the aforementioned known construction, in order to increase the amount of looseness of each of the drive cables upon the connection operation by weakening the force with which the tension applying member is pressed against the drive cable, the guide groove is elongated, which increases a stroke amount of the tension applying member. As a result, appropriate tension application and downsizing of the apparatus may be inhibited, for which improvement may be considered. 
     An object of the present invention is to provide a tension applying apparatus, a drum apparatus and an opening and closing body drive apparatus for a vehicle which may ensure a greater amount of looseness of a drive cable without an increase of a stroke amount of a tension applying member. 
     Means for Solving Problem 
     A first aspect for achieving the aforementioned object provides a tension applying apparatus. The tension applying apparatus includes a tension applying member applying a tensile force to a drive cable by being pressed against the drive cable, a biasing member generating a biasing force for pressing the tension applying member against the drive cable, a holding member including a guide portion which restricts a moving direction of the tension applying member and a housing member housing the tension applying member and the holding member. The holding member is configured to change the moving direction of the tension applying member which is guided by the guide portion in a state where the holding member including a rotation shaft is housed within the housing member. The housing member includes a holding structure holding the holding member at a position to which the holding member rotates in a direction where a pressing angle of the tension applying member relative to the drive cable becomes shallow. 
     A second aspect for achieving the aforementioned object provides a drum apparatus including a motor, a drum rotating by the motor serving as a drive source, a drum housing portion housing the drum and a tension applying apparatus according to the first aspect, the tension applying apparatus being provided at the drum housing portion. 
     A third aspect for achieving the aforementioned object provides an opening and closing body drive apparatus for a vehicle including an opening and closing body, a plurality of guide rails, a plurality of guide roller units connecting the opening and closing body and the guide rails to one another and a tension applying apparatus according to the first aspect. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is an explanatory view of a slide door provided at a side surface of a vehicle body; 
         FIG. 2  is a perspective view illustrating a drum apparatus in a temporary holding state and tension applying apparatuses provided at the drum apparatus; 
         FIG. 3  is a schematic configuration view of a slide door apparatus; 
         FIG. 4  is a side view illustrating the drum apparatus with a cover member and the tension applying apparatuses provided at the drum apparatus after a connection operation of drive cables; 
         FIG. 5  is a side view illustrating the drum apparatus without the cover member and the tension applying apparatuses provided at the drum apparatus after the connection operation of the drive cables; 
         FIG. 6  is a cross-sectional view of the first tension applying apparatus after the connection operation of the drive cables, the cross-sectional view being taken along a line VI-VI in  FIG. 4 ; 
         FIG. 7  is a cross-sectional view of the second tension applying apparatus after the connection operation of the drive cables, the cross-sectional view being taken along a line VII-VII in  FIG. 4 ; 
         FIG. 8  is an exploded perspective view of the tension applying apparatuses; 
         FIG. 9  is a side view illustrating the drum apparatus with the cover member in the temporary holding state and the tension applying apparatuses provided at the drum apparatus; 
         FIG. 10  is a side view illustrating the drum apparatus without the cover member in the temporary holding state and the tension applying apparatuses provided at the drum apparatus; 
         FIG. 11  is a cross-sectional view of the first tension applying apparatus in the temporary holding state, the cross-sectional view being taken along a line XI-XI in  FIG. 9 ; 
         FIGS. 12A and 12B  are enlarged views each of which illustrates a vicinity of a rotation restriction member,  FIG. 12A  illustrating the temporary holding state,  FIG. 12B  illustrating a state after the connection operation of the drive cables; 
         FIG. 13  is a cross-sectional view of the second tension applying apparatus in the temporary holding state, the cross-sectional view being taken along a line XIII-XIII in  FIG. 9 ; 
         FIGS. 14A and 14B  are perspective views each of which illustrates the second tension applying apparatus,  FIG. 14A  illustrating the temporary holding state,  FIG. 14B  illustrating a state after the connection operation of the drive cables; 
         FIGS. 15A and 15B  are a front view of an engagement member and a plan view of the engagement member, respectively; 
         FIG. 16  is a side view of an axial portion provided at a support member; and 
         FIGS. 17A and 17B  are operation explanatory views of the second tension applying apparatus,  FIG. 17A  illustrating the temporary holding state,  FIG. 17B  illustrating a state after the connection operation of the drive cables. 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     A tension applying apparatus, a drum apparatus and an opening and closing body drive apparatus for a vehicle according to an embodiment of the invention are explained below with reference to drawings. As illustrated in  FIG. 1 , a vehicle  1  of the embodiment includes a slide door apparatus  30  serving as an opening and closing body drive apparatus for a vehicle. The vehicle  1  includes a slide door  4  configured to open and close a door opening portion  3  provided at a side surface of a vehicle body  2  in a state where the slide door  4  moves in a vehicle front-rear direction (in a left-right direction in  FIG. 1 ). The slide door  4  corresponds to an opening and closing body. 
     Specifically, plural guide rails  11  to  13  extending in the front-rear direction are provided at the side surface of the vehicle body  2 . The guide rails  11  to  13  include a center rail  11 , an upper rail  12  and a lower rail  13  provided at a rear, an upper edge portion and a lower edge portion (at a left side, an upper side and a lower side in  FIG. 1 ) of the door opening portion  3 , respectively. The slide door  4  is connected to the guide rails  11  to  13  via guide roller units  21  to  23 . The guide roller units  21  to  23  include guide rollers (not illustrated) rolling on respective paths obtained by the corresponding guide rails  11  to  13 . The guide roller units  21  to  23  support the slide door  4  at the vehicle body  2  (specifically, the guide rails  11  to  13 ) so that an opening and closing operation of the slide door  4  that moves forward and rearward along the guide rails  11  to  13  is available. The slide door  4 , the guide rails  11  to  13  and the guide roller units  21  to  23  constitute the slide door apparatus  30 . 
     As illustrated in  FIGS. 2 and 3 , the slide door apparatus  30  of the embodiment includes two drive cables  31  and  32  arranged along an extending direction of the center rail  11  and a drum apparatus  40  configured to reel out one of the two drive cables  31  and  32  and reel in the other of the two drive cables  31  and  32 . In the embodiment, respective ends of the drive cables  31  and  32  are connected to the guide roller unit  21  in directions opposite from each other. Accordingly, the slide door apparatus  30  of the embodiment is configured to pull the slide door  4  supported at the guide roller unit  21  selectively in an opening direction and a closing direction. 
     Specifically, as illustrated in  FIG. 2 , the drum apparatus  40  of the embodiment includes a drum  42  rotating by a motor  41  serving as a drive source. That is, base ends of the drive cables  31  and  32  are connected to the drum  42 . The drum apparatus  40  is configured to reel out one of the drive cables  31  and  32  while reeling in the other of the drive cables  31  and  32  based on a rotation direction of the drum  42 . 
     The drum apparatus  40  of the embodiment also includes tension applying apparatuses  51  and  52  configured to apply respective tensile forces to the drive cables  31  and  32 . Each of the tension applying apparatuses  51  and  52  operates to absorb looseness of each of the drive cables  31  and  32  which occurs when each of the drive cables  31  and  32  is reeled out. As a result, the slide door  4  may be pulled smoothly. 
     As illustrated in  FIG. 3 , the drum apparatus  40  is arranged within the vehicle body  2  in the vicinity of the center rail  11 , specifically, at a substantially center portion of the center rail  11  in a longitudinal direction thereof. Two guide tubes  53  and  54  extending to a front side and a rear side of the vehicle are connected to the drum apparatus  40 . The drive cables  31  and  32  are configured to be pulled out adjacent to a front end  11   f  (in the vicinity of a right end portion in  FIG. 3 ) and adjacent to a rear end  11   r  (in the vicinity of a left end portion in  FIG. 3 ) of the center rail  11  via the guide tubes  53  and  54 . 
     In the present embodiment, pulleys  55  and  56  are provided adjacent to the front end  11   f  and the rear end  11   r  of the center rail  11  respectively. The drive cables  31  and  32  are wound at the pulleys  55  and  56  respectively so as to be arranged along the extending direction of the center rail  11 . 
     Specifically, the first drive cable  31  which is pulled towards the front end  11   f  of the center rail  11  via the guide tube  53  is wound at the pulley  55  in the vicinity of the front end  11   f  so as to be routed towards the rear end  11   r  from the front end  1  if along the extending direction of the center rail  11 . The second drive cable  32  which is pulled towards the rear end  11   r  of the center rail  11  via the guide tube  54  is wound at the pulley  56  in the vicinity of the rear end  11   r  so as to be routed towards the front end  11   f  from the rear end  11   r  along the extending direction of the center rail  11 . 
     That is, in the slide door apparatus  30  of the embodiment, the drum apparatus  40  operates to reel in the first drive cable  31  so that the guide roller unit  21  pulled by the first drive cable  31  moves towards the front end  1  if of the center rail  11 . In addition, the second drive cable  32  is reeled in so that the guide roller unit  21  pulled by the second drive cable  32  moves towards the rear end  11   r  of the center rail  11 . In the slide door apparatus  30  of the embodiment, the slide door  4  supported by the guide roller unit  21  is configured to open and close accordingly. 
     In a state where the slide door  4  of the embodiment is at a fully closed position (a position illustrated with alternate long and two short dashes line in  FIG. 3 ) to which the slide door  4  moves forward in the vehicle, the slide door  4  is arranged so that a decorative surface of the slide door  4  is substantially coplanar with the side surface of the vehicle body  2  at which the center rail  11  is provided. In a case where the slide door  4  moves rearward in the vehicle (left side in  FIG. 3 ) by the opening operation, the slide door  4  is arranged at an outer side in a vehicle width direction (lower side in  FIG. 3 ) than the side surface of the vehicle body  2  so as not to interfere with the side surface of the vehicle body. In the embodiment, a front portion (right side in  FIG. 5 ) of each of the guide rails  11  to  13  in the vehicle is curved towards an inner side in the vehicle width direction (upper side in  FIG. 3 ) so as to secure an opening and closing operation of the slide door  4 . 
     In the embodiment, in a case where the guide roller unit  21  passes through the aforementioned curving portion provided at each of the guide rails  11  to  13 , the guide roller unit  21  is configured to rotate relative to the curving portion about a rotation axis  60 . As a result, according to the slide door apparatus  30  of the embodiment, the slide door  4  may maintain a state being arranged substantially parallel to the side surface of the vehicle body  2  regardless of an operation position of the slide door  4 . 
     (Tension Applying Apparatus) 
     Next, constructions of the tension applying apparatuses  51  and  52  provided at the drum apparatus  40  of the embodiment are explained. 
     As illustrated in  FIGS. 2 and 3 , the drum apparatus  40  of the embodiment includes a drum housing portion  61  which internally houses the drum  42  and a motor drive portion  62  which houses a reducer for reducing rotations of the motor  41  and a component such as a control board, for example (not illustrated). The tension applying apparatuses  51  and  52  of the embodiment are provided integrally with the drum housing portion  61 . 
     Specifically, as illustrated in  FIGS. 4 to 7 , the drum housing portion  61  of the embodiment includes a housing  63  in a flat box form with a bottom and a cover member  64  covering an opening portion of the housing  63 . Specifically, as illustrated in  FIGS. 4 and 5 , the housing  63  of the embodiment includes an outer configuration in a substantially W-shaped form as in a side view viewed from the cover member  64  attached to the opening portion of the housing  63 . The drum  42  is housed within a center housing portion  70  provided at a substantially center portion of the W-shaped configuration. 
     Further specifically, the drum  42  of the embodiment is housed in the center housing portion  70  in a state where a rotation shaft  42   a  of the drum  42  is substantially orthogonal to a bottom wall  63   c  of the housing  63  and the cover member  64 . The drum housing portion  61  of the embodiment includes a first housing portion  71  and a second housing portion  72  positioned to sandwich therebetween the center housing portion  70  in a radial direction of the drum  42  which is housed in the center housing portion  70 . Further, in the embodiment, the guide tubes  53  and  54  are connected to respective end portions  63   a  and  63   b  of the housing  63  in the substantially W-shaped form. The drive cables  31  and  32  are reeled in by the drum  42  housed in the center housing portion  70  in a state where the drive cables  31  and  32  are routed within the first housing portion  71  and the second housing portion  72  connected to the guide tubes  53  and  54  where the drive cables  31  and  32  are inserted to be positioned. 
     As illustrated in  FIGS. 6 to 8 , each of the tension applying apparatuses  51  and  52  of the embodiment includes a tension applying member  73  and a biasing member  74 . The tension applying member  73  may apply the tensile force to the corresponding drive cable  31  or  32  while being pressed against the drive cable  31  or  32 . The biasing member  74  is configured to generate a biasing force for pressing the tension applying member  73  to the corresponding drive cable  31  or  32 . 
     Specifically, the tension applying members  73  of the embodiment are configured by including pulleys  75  and  56  pressed against the respective drive cables  31  and  32  and support members  81  and  82  rotatably supporting the pulleys  75  and  76 . Coil springs (compression coil springs)  83  and  84  each of which generates the biasing force depending on an elastic deformation amount are employed as the respective biasing members  74 . In the drum apparatus  40  of the embodiment, the pulley  75  and the support member  81  constituting the tension applying member  73  and the coil spring  83  serving as the biasing member  74  are housed within the first housing portion  71  where the drive cable  31  to which the tensile force of the tension applying member  73  is applied is routed. In addition, in the drum apparatus  40  of the embodiment, the pulley  76  and the support member  82  constituting the tension applying member  73  and the coil spring  84  serving as the biasing member  74  are housed within the second housing portion  72  where the drive cable  32  to which the tensile force of the tension applying member  73  is applied is routed. 
     Specifically, each of the support members  81  and  82  includes a pair of side wall portions  86   a  and  86   b  facing each other, a base wall portion  87  connecting base end sides of the side wall portions  86   a  and  86   b , and an axial portion  88  extending in a direction substantially orthogonal to the base wall portion  87 . Each of the side wall portions  86   a  and  86   b  includes a U-shaped groove  85  at an end. 
     That is, the support members  81  and  82  rotatably support the pulleys  75  and  76  respectively in a state where rotation shafts  75   a  and  76   a  of the pulleys  75  and  76  are inserted to be positioned within the respective U-shaped grooves  85  so that each of the rotation shafts  75   a  and  76   a  is bridged between the side wall portions  86   a  and  86   b . In addition, the coil springs  83  and  84  are fitted to the respective axial portions  88  of the support members  81  and  82 . The support member  82  at the second tension applying apparatus  52  applying the tensile force to the second drive cable  32  includes a tubular portion  89  surrounding an outer side of the coil spring  84  which is fitted to the axial portion  88 . In the embodiment, respective one ends (first ends) of the coil springs  83  and  84  fitted to the axial portions  88  make contact with the base wall portions  87  of the support members  81  and  82  so that the biasing forces generated by the coil springs  83  and  84  are transmitted to the support members  81 ,  82  and the pulleys  75 ,  76  supported at the support members  81 ,  82 . 
     In the drum apparatus  40  of the embodiment, contact surfaces S are provided within the first housing portion  71  and the second housing portion  72  respectively, the first housing portion  71  and the second housing portion  72  being constituted by the housing  63  and the cover member  64  serving as housing members of the drum apparatus  40 . The other ends (second ends) of the coil springs  83  and  84  make contact with the respective contact surfaces S. That is, the coil springs  83  and  84  are compressed between the respective contact surfaces S and the support members  81  and  82 . Based on elastic resilience of each of the coil springs  83  and  84 , the pulleys  75  and  76  supported at the support members  81  and  82  are biased to be pressed against the drive cables  31  and  32 . 
     Specifically, as illustrated in  FIGS. 5 to 7 , in the embodiment, the contact surfaces S are arranged adjacent to the respective end portions  63   a  and  63   b  of the housing  63  to which ends  53   e  and  54   e  of the guide tubes  53  and  54  are connected. In addition, guide grooves  91  and  92  are provided at the cover member  64  constituting the first housing portion  71  and the second housing portion  72  in a state where the cover member  64  is mounted to the housing  63 . The guide grooves  91  and  92  extend from the end portions  63   a  and  63   b  to a center (a right side in  FIG. 6  and a left side in  FIG. 7 ) along the W-shaped configuration of the housing  63 . Guide grooves  93  and  94  are also provided at the bottom wall  63   c  of the housing  63  so as to be positioned facing the respective guide grooves  91  and  92  and in the vicinity of the cover member  64 . The guide grooves  93  and  94  extend from the respective end portions  63   a  and  63   b  of the housing  63  towards the center thereof in the same way as the guide grooves  91  and  92 . 
     In the present embodiment, the rotation shafts  75   a  and  76   a  of the pulleys  75  and  76  are inserted to be positioned within the guide grooves  91 ,  92  and the guide grooves  93 ,  94 . The pulleys  75  and  76  are configured to be guided by the guide grooves  91 ,  92  and the guide grooves  93 ,  94  so as to move along an extending direction of each of the guide grooves  91 ,  92 ,  93  and  94 . 
     Specifically, as illustrated in  FIGS. 4 to 7 , the pulleys  75  and  76  biased by the coil springs  83  and  84  are guided by the guide grooves  91 ,  92  and the guide grooves  93 ,  94  so as to move from the end portions  63   a  and  63   b  of the housing  63  towards the center thereof. The drive cables  31  and  32  one of which is reeled in to the drum  42  from one of the guide tubes  53  and  54  connected to the respective end portions  63   a  and  63   b  of the housing  63  while the other of which is reeled out towards the other of the guide tubes  53  and  54  from the drum  42  extend in a direction intersecting with the guide grooves  91 ,  92  and the guide grooves  93 ,  94 . Accordingly, in the embodiment, the pulleys  75  and  76  constituting the tension applying members  73  are configured to be pressed against the drive cables  31  and  32  routed within the first housing portion  71  and the second housing portion  72  respectively. 
     For example, the pulley ( 75 ,  76 ) pressed against the drive cable ( 31 ,  32 ) which is reeled out from the drum  42  moves to the center based on the biasing force of the coil spring ( 83 ,  84 ). Then, the pulley ( 75 ,  76 ) pressed against the drive cable ( 31 ,  32 ) which is reeled in to the drum  42  moves towards the end portion ( 63   a ,  63   b ) of the housing  63  against the biasing force of the coil spring ( 83 ,  84 ). 
     Accordingly, the pulleys  75  and  76  biased by the coil springs  83  and  84  are guided by the guide grooves  91 ,  92  and the guide grooves  93 ,  94  so that the pulleys  75  and  76  move in a pressing direction and a separating direction (pressing and anti-pressing directions) relative to the drive cables  31  and  32  routed within the first housing portion  71  and the second housing portion  72 . Accordingly, the tension applying apparatuses  51  and  52  of the embodiment are configured to apply appropriate tensile forces to the respective drive cables  31  and  32 . 
     In the drum apparatus  40  of the embodiment, each of the tension applying apparatuses  51  and  52  includes a temporary holding structure so that the pulleys  75  and  76  and the support members  81  and  82  constituting the tension applying members  73  are retainable in a state where forces with which the tension applying members  73  are pressed against the drive cables  31  and  32  are weakened. In the embodiment, as a result, in a case where the drive cables  31  and  32  are connected to the slide door  4  (guide roller unit  21 ), an amount of looseness of each of the drive cables  31  and  32  increases to easily perform the connection operation of the drive cables  31  and  32 . 
     (Temporary Holding Structure of the Tension Applying Member in the First Tension Applying Apparatus) 
     First, the temporary holding structure of the tension applying member  73  mounted to the first tension applying apparatus  51  which applies the tensile force to the first drive cable  31  is explained. 
     As illustrated in  FIGS. 5, 6, 10 and 11 , the first tension applying apparatus  51  of the embodiment includes a holding member  100  which includes a rotation shaft  100   a  substantially in parallel to the rotation shaft  42   a  of the drum  42  and which is housed within the first housing portion  71 . The pulley  75  and the support member  81  constituting the tension applying member  73  of the first tension applying apparatus  51  and the coil spring  83  serving as the biasing member  74  are retained by the holding member  100 . 
     Specifically, the holding member  100  of the embodiment includes an angular tube portion  101  which includes an opening end (a right end portion in  FIGS. 6 and 11 ) and an elongated configuration in a substantially angular tube form. The pulley  75 , the support member  81  and the coil spring  83  are retained within the tube of the angular tube portion  101 . 
     Specifically, as illustrated in  FIGS. 6 and 11 , the coil spring  83  is inserted to be positioned within the angular tube portion  101  so that a bottom surface  101   s  of the angular tube portion  101  serves as the contact surface S. In addition, the angular tube portion  101  includes opposed side wall portions  101   a  and  101   b  each of which is cut from an opening end side to a base end side of the angular tube portion  101  (from the right side to the left side in  FIGS. 6 and 11 ) to obtain a pair of slits  102   a  and  102   b  extending in a longitudinal direction of the angular tube portion  101 . The pulley  75  and the support member  81  are also inserted to be positioned within the angular tube portion  101  in a state where the rotation shaft  75   a  of the pulley  75  is inserted to be positioned within both the slits  102   a  and  102   b.    
     In the embodiment, the rotation shaft  100   a  of the holding member  100  is arranged at the base end side of the angular tube portion  101 . In addition, a support bore  103  is provided at the cover member  64  and a support bore  104  is provided at the bottom wall  63   c  of the housing  63 , the cover member  64  and the housing  63  constituting the first housing portion  71 . In the embodiment, the support bores  103  and  104  are provided adjacent to positions where the end  53   e  of the guide tube  53  is connected to the end portion  63   a  of the housing  63 . Accordingly, the holding member  100  of the embodiment is rotatable about the rotation shaft  100   a  which is supported at the bottom wall  63   c  of the housing  63  and the cover member  64  on the same plane as the first drive cable  31  which is also arranged within the first housing portion  71  in the same way as the holding member  100 . 
     That is, in the holding member  100  of the embodiment, the angular tube portion  101  functions as a guide portion so as to specify a moving direction of each of the pulley  75  and the support member  81  held within the tube of the angular tube portion  101 , specifically, to restrict the moving direction to a longitudinal direction of the holding member  100 . In addition, the holding member  100  rotates about the rotation shaft  100   a  so that the moving direction of each of the pulley  75  and the support member  81  guided by the angular tube portion  101  is changeable. In the first tension applying apparatus  51  of the embodiment, the holding member  100  is rotated so that the pulley  75  and the support member  81  may be temporarily held in a state where the force with which the pulley  75  is pressed against the first drive cable  31  is weakened. 
     Specifically, as illustrated in  FIGS. 9 and 10 , the holding member  100  of the embodiment rotates in a counterclockwise direction in  FIGS. 9 and 10  so that an angle (pressing angle) by which the pulley  75  guided by the angular tube portion  101  that constitutes the guide portion of the holding member  100  is pressed against the first drive cable  31  routed within the first housing portion  71  based on the biasing force of the coil spring  83  is formed to be shallow. 
     That is, a path of the first drive cable  31  reeled out from the drum  42  and reeled in to the drum  42  is bent greatly while the pressing angle of the pulley  75  relative to the first drive cable  31  is deeper. In addition, the path of the first drive cable  31  becomes linear while the pressing angle of the pulley  75  relative to the first drive cable  31  is shallower. Accordingly, the force with which the pulley  75  is pressed against the first drive cable  31  is strong while the pressing angle that changes depending on a rotation position of the holding member  100  is deeper and is weak while the pressing angle is shallower. In the first tension applying apparatus  51  of the embodiment, the holding member  100  may be held at the rotation position to which the holding member  100  rotates in a direction where the pressing angle of the pulley  75  becomes shallow. 
     Specifically, as illustrated in  FIGS. 9 to 11 , second guide grooves  111  and  113  are provided at the cover member  64  and the bottom wall  63   c  of the housing  63  respectively, the cover member  64  and the housing  63  constituting the first housing portion  71 , so as to extend by intersecting with the first guide grooves  91  and  93 . In the embodiment, the second guide grooves  111  and  113  serve as bore portions into which the rotation shaft  75   a  of the pulley  75  is also insertable. 
     That is, in the first tension applying apparatus  51 , the pulley  75  moves in a direction separating from the first drive cable  31  against the biasing force of the coil spring  83  so that the rotation shaft  75   a  which is inserted to be positioned within the first guide grooves  91  and  93  is movable from the first guide grooves  91  and  93  to the second guide grooves  111  and  113 . Then, in the first tension applying apparatus  51  of the embodiment, the pulley  75  and the support member  81  move in an extending direction of each of the second guide grooves  111  and  113  while being guided by the second guide grooves  111  and  113  to thereby permit the rotation of the holding member  100 . 
     In addition, the holding member  100  rotates in a direction where the rotation shaft  75   a  of the pulley  75  guided by the second guide grooves  111  and  113  is separated from the first guide grooves  91  and  93  (counterclockwise direction in  FIG. 9 ) so that the pressing angle of the pulley  75  relative to the first drive cable  31  becomes shallow. According to the first tension applying apparatus  51  of the embodiment, the pulley  75  and the support member  81  may be retained at a position where the force with which the pulley  75  is pressed against the first cable  31  is weakened. 
     Further, in the embodiment, each of the second guide grooves  111  and  113  includes a configuration so that the biasing force may be stored at the coil spring  83  held at the holding member  100  in a state where the pulley  75  guided by the second guide grooves  111  and  113  moves in a direction separating from the first guide grooves  91  and  93  with the rotation of the holding member  100 . 
     Specifically, the second guide grooves  111  and  113  are configured so that a center-to center dimension between the rotation shaft  75   a  of the pulley  75  and the rotation shaft  100   a  of the holding member  100  (L, L′) decreases (L&gt;L′) in a state where the pulley  75  moves in the direction separating from the first guide grooves  91  and  93 . Refer to  FIGS. 6 and 11 . In the embodiment, as a result, the coil spring  83  is compressed between the support member  81  for the pulley  75  and the contact surface S provided at the holding member  100 . 
     As illustrated in  FIGS. 4 and 9 , in the embodiment, an engagement portion  115  is provided at a position in each of the second guide grooves  111  and  113  most away from the first guide grooves  91  and  93 , i.e., at the rotation position of the holding member  100  in  FIG. 11 . The engagement portion  115  is engageable with the rotation shaft  75   a  of the pulley  75  which is guided by the second guide grooves  111  and  113 . Specifically, the engagement portion  115  is provided by bending the extending direction of each of the second guide grooves  111  and  113 . In the embodiment, as a result, the rotation shaft  75   a  of the pulley  75  is engaged at the position most away from the first guide grooves  91  and  93  based on the stored biasing force of the coil spring  83 . 
     Further, the first tension applying apparatus  51  of the embodiment includes a rotation restriction member  117  which may restrict the rotation of the holding member  100  at a rotation position where the rotation shaft  75   a  of the pulley  75  is inserted to be positioned within the first guide grooves  91  and  93 , i.e., at a rotation position illustrated in  FIGS. 4 to 6 . 
     Specifically, as illustrated in  FIGS. 12A and 12B , the rotation restriction member  117  of the embodiment is integrally provided at the holding member  100  in a state where a tip end side of the rotation restriction member  117  protrudes towards a peripheral wall  63   d  of the housing  63 . In addition, in the embodiment, an engagement protruding portion  118  is provided at the peripheral wall  63   d  of the housing  63  so as to protrude to an inner side of the first housing portion  71 . An engagement recess portion  119  is provided at a tip end portion of the rotation restriction member  117  so as to be engageable with the engagement protruding portion  118 . 
     That is, the rotation restriction member  117  of the embodiment rotates integrally with the holding member  100  so that the engagement recess portion  119  is configured to engage with the engagement protruding portion  118  provided at the peripheral wall  63   d  of the housing  63  at the rotation position of the holding member  100  at which the rotation shaft  75   a  of the pulley  75  is guided by the first guide grooves  91  and  93 . Refer to  FIGS. 4 and 5 . Accordingly, by the restriction of the rotation of the holding member  100 , the first tension applying apparatus  51  of the embodiment is configured so that the pulley  75  guided by the first guide grooves  91  and  93  is stably movable in the pressing direction and the separating direction relative to the first drive cable  31 . 
     (Temporary Holding Structure of the Tension Applying Member in the Second Tension Applying Apparatus) 
     Next, the temporary holding structure of the tension applying member  73  mounted to the second tension applying apparatus  52  which applies the tensile force to the second drive cable  32  is explained. 
     As illustrated in  FIGS. 5, 7, 10 and 13 , in the second tension applying apparatus  52 , the pulley  76  and the support member  82  housed within the second housing portion  72  are also guided by the guide grooves  92  and  94  provided at the cover member  64  and the bottom wall  63   c  of the housing  63 . Accordingly, the pulley  76  is movable in the pressing direction and the separating direction relative to the second drive cable  32 . The second tension applying apparatus  52  includes an engagement member  120  which may cause the pulley  76  and the support member  82  to engage with the housing  63  at a position to which the pulley  76  and the support member  82  constituting the tension applying member  73  move in a direction separating from the second drive cable  32 , i.e., a position at which the biasing force of the coil spring  84  serving as the biasing member  74  is stored at the coil spring  84 . 
     That is, the pulley  76  and the support member  82  engage with the housing  63  so that the biasing force stored at the coil spring  84  is inhibited from being transmitted to the second drive cable  32 . In the embodiment, as a result, the pulley  76  and the support member  82  may be held in a state where a force with which the pulley  76  is pressed against the second drive cable  32  is weakened. 
     Specifically, as illustrated in  FIGS. 7, 13, 14A and 14B , a penetration bore  121  is provided at the peripheral wall  63   d  of the housing  63  which is positioned at the end portion  63   b  of the second housing portion  72  connected to an end  54   e  of the guide tube  54 . The axial portion  88  of the support member  82  is inserted to the penetration bore  121  in a case where the support member  82  moves in a direction separating from the second drive cable  32 . In addition, the engagement member  120  of the embodiment is provided at an outer peripheral surface  63   s  of the housing  63  at a position where the penetration bore  121  is provided. The engagement member  120  engages, via the penetration bore  121 , with the axial portion  88  of the support member  82  protruding towards the outer peripheral surface  63   s  of the housing  63  so that the support member  82  and the pulley  76  are engageable with the housing  63 . 
     Further specifically, as illustrated in  FIGS. 14A, 14B, 15A and 15B , the engagement member  120  of the embodiment includes an outer configuration in a substantially rectangular flat plate. In addition, in the embodiment, a pair of guide flanges  122  is provided at the outer peripheral surface  63   s  of the housing  63  for slidably holding the engagement member  120  by sandwiching the engagement member  120  with the outer peripheral surface  63   s . Specifically, the guide flanges  122  sandwich the engagement member  120  in a short-length direction thereof (in a left-right direction in  FIG. 15A ) for holding the engagement member  120  at a position at which the penetration bore  121  is provided. Accordingly, the engagement member  120  of the embodiment is slidable on the outer peripheral surface  63   s  of the housing  63  along a longitudinal direction of the engagement member  120  in a state where the longitudinal direction (up-down direction in  FIG. 15A ) substantially matches the axial direction of the pulley  76  (extending direction of the rotation shaft  76   a ). 
     In the embodiment, operation flanges  141  and  142  are provided at longitudinally opposed ends of the engagement member  120  so as to protrude in a thickness direction (up-down direction in  FIG. 15B ) of the engagement member  120 . Further, an insertion bore  130  is provided at the engagement member  120  so as to penetrate the engagement member  120  in the thickness direction thereof. The axial portion  88  of the support member  82  protruding towards the outer peripheral surface  63   s  of the housing  63  via the penetration bore  121  is inserted to be positioned within the insertion bore  130 . 
     Specifically, the insertion bore  130  includes first and second bore portions  131  and  132  which are continued in the longitudinal direction of the engagement member  120 . The first bore portion  131  includes a configuration for allowing insertion and removal of the axial portion  88  in a direction where the support member  82  biased by the coil spring  84  moves, i.e., in the thickness direction of the engagement member  120 . The second bore portion  132  includes a configuration for restricting removal of the axial portion  88  in the direction where the support member  82  biased by the coil spring  84  moves in a state where the second bore portion  132  engages with the axial portion  88  which is inserted to the second bore portion  132 . 
     Specifically, as illustrated in  FIG. 16 , the axial portion  88  constituting an engagement protruding portion in the support member  82  of the embodiment includes a small diameter portion  88   a  in a substantially column form and a flange portion  88   b  provided at an end of the small diameter portion  88   a . In addition, as illustrated in  FIG. 15A , the first and second bore portions  131  and  132  include circular bore configurations which partially overlap in the longitudinal direction of the engagement member  120 . In the embodiment, an inner diameter R 1  of the first bore portion  131  is set to be a greater value than a diameter D 2  of the flange portion  88   b  of the axial portion  88  (R 1 &gt;D 2 ). An inner diameter R 2  of the second bore portion  132  is specified to be a value greater than a diameter D 1  of the small diameter portion  88   a  of the axial portion  88  and smaller than the diameter D 2  of the flange portion  88   b  (D 1 &lt;R 2 &lt;D 2 ). 
     That is, the engagement member  120  of the embodiment slides in the longitudinal direction thereof by operations of the operation flanges  141  and  142 . Accordingly, any one of the first bore portion  131  and the second bore portion  132  constituting the insertion bore  130  is arranged at a position corresponding to the penetration bore  121 . 
     The insertion bore  130  of the embodiment is configured so that the axial portion  88  of the support member  82  inserted to be positioned within the insertion bore  130  relatively moves between the first and second bore portions  131  and  132  by the aforementioned operation of the engagement member  120 . As a result, in the second tension applying apparatus  52  of the embodiment, the pulley  76  and the support member  82  may be engaged at positions where the biasing force of the coil spring  84  is stored at the coil spring  84  and such engagement may be released. 
     Specifically, as illustrated in  FIGS. 17A and 17B , the engagement member  120  of the embodiment is configured so that any one of longitudinally end portions of the engagement member  120  protrudes from an outline Q obtained by the housing  63  and the cover member  64  in a side view viewed from the outer peripheral surface  63   s  of the housing  63  at which the engagement member  120  is retained. That is, one of the operation flanges  141  and  142  provided at the longitudinally opposed ends is retracted into the outline Q constituted by the housing  63  and the cover member  64  so that the other of the operation flanges  141  and  142  protrudes from the outline Q of the housing  63  and the cover member  64  in a direction where the one of the operation flanges  141  and  142  is retracted. Accordingly, the engagement member  120  is configured so that the operation flange  141  or  142  which protrudes is operated in a direction being retracted into the outline Q of the housing  63  and the cover member  64 . 
     Specifically, as illustrated in  FIGS. 13, 14A and 17A , in a case where the operation flange  141  serving as a first operation portion protrudes at the side of the cover member  64  (upper side in  FIGS. 13 and 17A ), the engagement member  120  of the embodiment is configured so that the second bore portion  132  thereof is disposed at a position corresponding to the penetration bore  121 . Then, as illustrated in  FIGS. 7, 14B and 17B , in a case where the operation flange  142  serving as a second operation portion protrudes at the side of the bottom wall  63   c  of the housing  63  (lower side in  FIGS. 7 and 17B ), the engagement member  120  of the embodiment is configured so that the first bore portion  131  thereof is disposed at a position corresponding to the penetration bore  121 . 
     That is, in the second tension applying apparatus  52  of the embodiment, the axial portion  88  of the support member  82  is in a state being insertable into the first bore portion  131  of the insertion bore  130  by the pressing of the operation flange  141  serving as the first operation portion to operate the engagement member  120  in the direction where the operation flange  141  is retracted into the outline Q of the housing  63  and the cover member  64 . Accordingly, the support member  82  and the pulley  76  are movable to positions at which the biasing force is stored at the coil spring  84 . 
     Further, the operation flange  142  serving as the second operation portion is pressed from the aforementioned state to move the engagement member  120  in the direction where the operation flange  142  is retracted into the outline Q of the housing  63  and the cover member  64  so that the axial portion  88  of the support member  82  which is inserted to be positioned within the insertion bore  130  relatively moves from the first bore portion  131  to the second bore portion  132 . As a result, because of the engagement of the axial portion  88  with the second bore portion  132 , removal of the axial portion  88  in a direction where the support member  82  biased by the coil spring  84  moves, i.e., in the axial direction of the axial portion  88 , is restricted. In the embodiment, the support member  82  and the pulley  76  therefore engage with the housing  63  at the positions at which the biasing force is stored at the coil spring  84 . 
     In a case where each of the support member  82  and the pulley  76  engages with the housing  63 , such engagement of each of the support member  82  and the pulley  76  is released by pressing the operation flange  141  to operate the engagement member  120  in the direction where the operation flange  141  is retracted into the outline Q of the housing  63  and the cover member  64 . Accordingly, in the second tension applying apparatus  52  of the embodiment, each of the support member  82  and the pulley  76  biased by the coil spring  84  is configured to move in a direction pressed against the second drive cable  32 . 
     Next, an assembly procedure (operation) of the drum apparatus  40  constructed in the aforementioned manner is explained. As illustrated in  FIGS. 9, 10 and 13 , upon assembly of the drum apparatus  10  on the vehicle  1  (vehicle body  2 ), in each of the tension applying apparatuses  51  and  52  provided at the drum apparatus  40  of the embodiment, the tension applying member  73  is retained in a state where a force with which the tension applying member  73  is pressed against the drive cable  31  or  32  is weakened on a basis of the biasing force of the biasing member  74 . 
     That is, at this time, in the first tension applying apparatus  51 , the rotation shaft  75   a  of the pulley  75  constituting the tension applying member  73  is in a state being inserted to be positioned within the second guide grooves  111  and  113  which extend to intersect with the first guide grooves  91  and  93 , i.e., in a state engaging with the second guide grooves  111  and  113 . In the second tension applying apparatus  52 , the support member  82  of the pulley  76  constituting the tension applying member  73 , specifically, the axial portion  88  of the support member  82 , engages with the housing  63  serving as the housing member by the engagement member  120 . As a result, the forces with which the pulleys  75  and  76  are pressed against the respective drive cables  31  and  32  are weakened and the biasing forces are stored at the coil springs  83  and  84  serving as the biasing members  74 . 
     In the embodiment, the connection operation of each of the drive cables  31  and  32  to the slide door  4  (guide roller unit  21 ) is performed while each of the tension applying members  73  of the tension applying apparatuses  51  and  52  is in the temporary holding state. After the connection operation, the biasing force stored at each of the coil springs  83  and  84  is released so that the appropriate tensile force is applied to each of the drive cables  31  and  32  against which the pulleys  75  and  76  are pressed. 
     Specifically, in the first tension applying apparatus  51 , the rotation shaft  75   a  of the pulley  75  protruding from the cover member  64  (the bottom wall  63   c  of the housing  63 ) by being inserted to be positioned within the second guide groove  111  ( 113 ) is operated so that the rotation shaft  75   a  moves from the second guide grooves  111  and  113  to the first guide grooves  91  and  93 . Because the holding member  100  rotates, the pressing angle of the pulley  75  relative to the first drive cable  31  is deepened. Further, in the aforementioned state, the rotation restriction member  117  restricts the rotation of the holding member  100 . The first tension applying apparatus  51  of the embodiment is therefore configured so that each of the pulley  75  and the support member  81  biased by the coil spring  83  is movable in the pressing direction and the separating direction relative to the first drive cable  31  while being guided by the first guide grooves  91  and  93 . 
     In addition, in the second tension applying apparatus  52 , the operation flange  141  serving as the operation portion is pressed to operate the engagement member  120  in the direction where the operation flange  141  is retracted into the outline Q of the housing  63  and the cover member  64 . Then, in the second tension applying apparatus  52  of the embodiment, the engagement of the support member  82  by the engagement member  120  is released. Accordingly, each of the pulley  76  and the support member  82  biased by the coil spring  84  is configured to be movable in the pressing direction and the separating direction relative to the second drive cable  32  in a state being guided by the guide grooves  92  and  94 . 
     According to the embodiment, the following effects are obtainable. 
     (1) The first tension applying apparatus  51  includes the holding member  100  including the guide portion which restricts the moving direction of the tension applying member  73  biased by the biasing member  74 . The first tension applying apparatus  51  also includes the housing  63  and the cover member  64  serving as the housing members that house therein the tension applying member  73  and the holding member  100 . In addition, the holding member  100  is housed within the first housing portion  71  while including the rotation shaft  100   a  so that the holding member  100  is configured to change the moving direction of the tension applying member  73  which is guided by the guide portion. Further, the temporary holding structure which may hold the holding member  100  at the position to which the holding member  100  rotates in the direction in which the pressing angle of the tension applying member  73  against the first drive cable  31  becomes shallow is provided at the housing  63  and the cover member  64 . 
     That is, the deeper the pressing angle which changes on a basis of the rotation of the holding member  100  is, the stronger the force with which the tension applying member  73  is pressed against the first drive cable  31  is. The shallower the pressing angle is, the weaker the force with which the tension applying member  73  is pressed against the first drive cable  31  is. Thus, according to the aforementioned construction, without increasing the stroke amount of the tension applying member  73  in the direction where the tension applying member  73  is pressed against the first drive cable  31  based on the biasing force of the biasing member  74  and in the direction where the tension applying member  73  separates from the first drive cable  31  against the aforementioned biasing force, the pressing force is weakened to secure a large amount of looseness. As a result, without disturbing appropriate tension application and downsizing of the apparatus, the connection operation of the first drive cable  31  may be simplified. In addition, there is an advantage that, in a case where the holding member  100  is rotated for releasing the temporary holding state, the biasing member  74  is inhibited from serving as a resistance. An improved operability may be secured accordingly. 
     (2) The second tension applying apparatus  52  includes the engagement member  120  which may cause the tension applying member  73  to engage with the housing  63  serving as the housing member at the position at which the biasing force is stored at the biasing member  74 . The engagement member  120  includes the operation flange  141  serving as the operation portion protruding from the outline Q of the housing  63  and the cover member  64 . The engagement member  120  is configured to release the engagement of the tension applying member  73  by the operation of the operation flange  141  in the direction where the operation flange  141  is retracted into the outline Q of the housing  63  and the cover member  64 . 
     According to the aforementioned construction, even in a case where a protruding amount of the operation flange  141  protruding from the outline Q of the housing  63  and the cover member  64  is restrained, the engagement member  120  may be operated easily and securely. As a result, the improved operability may be secured. 
     (3) In the tension applying apparatus  51 , the tension applying member  73  includes the pulley  75  pressed against the drive cable  31  and the support member  81  rotatably supporting the pulley  75 . In the tension applying apparatus  52 , the tension applying member  73  includes the pulley  76  pressed against the drive cable  32  and the support member  82  rotatably supporting the pulley  76 . Accordingly, without disturbing the operations of the drive cables  31  and  32 , the tensile force is applicable to each of the drive cables  31  and  32  against which the tension applying member  73  is pressed. 
     (4) The first guide grooves  91  and  93  are provided at the housing  63  and the cover member  64  serving as the housing members for guiding the tension applying member  73  biased by the biasing member  74  in the pressing direction and the separating direction relative to the first drive cable  31 . The second guide grooves  111  and  113  are also provided at the housing  63  and the cover member  64  for allowing the operation of the holding member  100  in a state extending to intersect with the first guide grooves  91  and  93 . 
     According to the aforementioned construction, the tension applying member  73  is brought to a state being guided by the guide grooves  111  and  113  so that the holding member  100  stably rotates. The tension applying member  73  rotates the holding member  100  in the direction separating from the first guide grooves  91  and  93  so that the pressing angle of the tension applying member  73  relative to the first drive cable  31  becomes shallow. From the aforementioned state, the holding member  100  is rotated in an opposite direction so that the tension applying member  73  returns to the state being guided by the first guide grooves  91  and  93 . As a result, the appropriate tensile force is applicable to the first drive cable  31  against which the tension applying member  73  is pressed. 
     (5) Each of the second guide grooves  111  and  113  includes the configuration so that the biasing force may be stored at the coil spring  83  held at the holding member  100  in a state where the tension applying member  73  guided by the second guide grooves  111  and  113  moves in the direction separating from the first guide grooves  91  and  93  with the rotation of the holding member  100 . 
     According to the aforementioned construction, in a case where the temporary holding state is released, the holding member  100  is rotatable with the biasing force stored at the biasing member  74 . As a result, the improved operability may be secured. 
     (6) The engagement portion  115  is provided at each of the second guide grooves  111  and  113  so as to engage the tension applying member  73  with each of the second guide grooves  111  and  113  at the rotation position of the holding member  100  where the pressing angle of the tension applying member  73  is shallow. Accordingly, the holding member  100  may be stably retained at the rotation position at which the pressing angle of the tension applying member  73  is shallow. 
     (7) The first tension applying apparatus  51  includes the rotation restriction member  117  which may restrict the rotation of the holding member  100  at the rotation position at which the tension applying member  73  is guided by the first guide grooves  91  and  93 . As a result, the tension applying member  73  guided by the first guide grooves  91  and  93  may maintain the state stably moving in the pressing direction and the separating direction relative to the first drive cable  31 . 
     (8) The coil spring  83  which generates the biasing force depending on its elastic deformation while being compressed between the contact surface S of the first housing portion  71  and the support member  81  and the coil spring  84  which generates the biasing force depending on its elastic deformation while being compressed between the contact surface S of the second housing portion  72  and the support member  82  are employed as the biasing members  74 . 
     According to the aforementioned construction, the tension applying members  73  may be stably and securely pressed against the drive cables  31  and  32 . As a result, there is an advantage that each of the biasing members  74  may be arranged in a compact manner. 
     (9) The contact surface S for the coil spring  83  is provided at the holding member  100 . Because of such construction, regardless of the rotation position of the holding member  100 , the coil spring  83  may maintain the state being compressed in the axial direction. As a result, the appropriate tensile force is applicable to the first drive cable  31  against which the tension applying member  73  that is biased by the coil spring  83  is pressed. 
     (10) The first tension applying apparatus  51  is configured so that the rotation shaft  75   a  of the pulley  75  inserted to be positioned within the first guide grooves  91 ,  93  or the second guide grooves  111 ,  113  protrudes to the outside of the housing  63  and the cover member  64  serving as the housing members. Because of such construction, the operation of the rotation shaft  75   a  of the pulley  75  protruding to the outside of the housing  63  and the cover member  64  may easily bring the holding member  100  to rotate. 
     (11) The engagement member  120  includes the operation flange  142  serving as the second operation portion protruding from the outline Q of the housing  63  and the cover member  64  in the direction where the operation flange  141  serving as the first operation portion is retracted into the outline Q. Then, the operation of the operation flange  142  in the direction being retracted into the outline Q of the housing  63  and the cover member  64  configures the tension applying member  73  to be engageable with the housing  63  at the position where the biasing force is stored. 
     According to the aforementioned construction, by a simple operation that is intuitively understandable, the engagement operation of the tension applying member  73  with the housing  63  may be performed. As a result, the improved operability may be secured. 
     (12) The engagement member  120  is configured so that while one of the operation flanges  141  and  142  is retracted into the outline Q of the housing  63  and the cover member  64 , the other of the operation flanges  141  and  142  protrudes from the outline Q of the housing  63  and the cover member  64  in the aforementioned retracted direction. 
     According to the aforementioned construction, at the same time as the engagement operation of the tension applying member  73  with the housing  63  is completed, a preparation operation necessary for releasing the aforementioned engagement state is completed. As a result, with the simple construction, the improved operability may be secured. 
     (13) The insertion bore  130  including the first and second bore portions  131  and  132  which are continued in the operation direction of the engagement member  120  is provided at the engagement member  120 . In addition, the axial portion  88  serving as the engagement protruding portion inserted to be positioned within the insertion bore  130  of the engagement member  120  at the position at which the support member  82  engages with the housing  63  is provided at the support member  82  constituting, together with the pulley  76 , the tension applying member  73 . Further, the first bore portion  131  includes the configuration which allows the insertion and removal of the axial portion  88  in the direction where the support member  82  biased by the coil spring  84  moves. The second bore portion  132  includes the configuration which may restrict the removal of the axial portion  88  in the moving direction of the support member  82  that is biased by the coil spring  84 , based on the engagement with the axial portion  88 . The insertion bore  130  is configured so that the axial portion  88  inserted to be positioned within the insertion bore  130  relatively moves between the first and second bore portions  131  and  132  by the operation of the engagement member  120 . 
     According to the aforementioned construction, with the simple construction, the engagement member  120  may be provided in a manner that the operation flange  142  serving as the second operation portion is operated in the retracted direction so that the tension applying member  73  is engageable with the housing  63 , and the operation flange  141  serving as the first operation portion is operated in the retracted direction so that the engagement of the tension applying member  73  is releasable. 
     (14) The peripheral wall  63   d  of the housing  63  is configured to serve as a wall portion including the penetration bore  121  into which the axial portion  88  provided at the support member  82  is inserted to be positioned, at the position where the biasing force is stored at the coil spring  84 . The engagement member  120  slides on a wall surface of the wall portion facing an opposite side of the tension applying member  73 , i.e., slides upon the outer peripheral surface  63   s  of the housing  63 , so as to be configured engageable with the axial portion  88  inserted to be positioned within the penetration bore  121 . 
     According to the aforementioned construction, with the simple construction, the tension applying member  73  may securely engage with the housing  63  and such engagement may be securely disengaged by the engagement member  120 . The aforementioned embodiment may be modified as follows. 
     In the embodiment, the drum apparatus  40  includes the first and second tension applying apparatuses  51  and  52  including different temporary holding structures of the tension applying members  73  from each other. Then, it is configured that the first tension applying apparatus  51  applies the tensile force to the first drive cable  31  and the second tension applying apparatus  52  applies the tensile force to the second drive cable  32 . However, not limited thereto, the tension applying apparatus  51  including the holding member  100  that is rotatable may be configured to apply the tensile force to each of the first and second drive cables  31  and  32  or the tension applying apparatus  52  including the engagement member  120  relative to the housing  63  may be configured to apply the tensile force to each of the first and second drive cables  31  and  32 . 
     The tension applying apparatuses  51  and  52  are not necessarily provided integrally with the drum apparatus  40 . In addition, each of the tension applying apparatuses  51  and  52  may apply the tensile force to the drive cable employed at the opening and closing body drive apparatus other than the slide door apparatus  30 . 
     In the aforementioned embodiment, the coil springs (compression coil springs)  83  and  84  are employed for the biasing members  74 . However, not limited thereto, the other spring member such as a torsion coil spring or a disc spring, for example, or a biasing member other than the spring member may be employed. 
     In the aforementioned embodiment, one of the tension applying members  73  includes the pulley  75  pressed against the drive cable  31  and the support member  81  rotatably supporting the pulley  75  while the other of the tension applying members  73  includes the pulley  76  pressed against the drive cable  32  and the support member  82  rotatably supporting the pulley  76 . However, not limited thereto, a non-rotating body including a sliding contact surface pressed against the drive cable  31  or  32  may serve as the tension applying member. The first tension applying apparatus  51  may be configured to directly bias the rotation shaft  75   a  of the pulley  75  with the omission of the support member  81 . 
     In the aforementioned embodiment, the drum housing portion  61  is obtained by the assembly of the cover member  64  on the housing  63 . However, not limited thereto, the construction of the housing member may be arbitrarily changed. In addition, the biasing member  74  is not necessarily housed within the housing member. 
     In the aforementioned embodiment, the holding member  100  includes the angular tube portion  101  including the opening end and the elongated configuration in the substantially angular tube form. The pulley  75 , the support member  81  and the coil spring  83  are retained within the angular tube portion  101 . Then, the angular tube portion  101  serves as the guide portion to thereby restrict the moving directions of the pulley  75  and the support member  81  biased by the coil spring  83 . However, not limited thereto, the construction of the holding member  100  including the guide portion may be arbitrarily changed. The position where the rotation shaft  100   a  is arranged is also not necessarily limited to the base end side of the angular tube portion  101 . 
     In the aforementioned embodiment, the first tension applying apparatus  51  includes the rotation restriction member  117  which may restrict the rotation of the holding member  100 . The rotation restriction member  117  may restrict the rotation of the holding member  100  at the rotation position at which the rotation shaft  75   a  of the pulley  75  is in a state being inserted to be positioned within the first guide grooves  91  and  93 , i.e., at the rotation position at which the pulley  75  biased by the coil spring  83  should apply the tensile force to the drive cable  31 . However, not limited thereto, the rotation restriction member  117  may be configured to restrict the rotation of the holding member  100  at the rotation position at which the pressing angle of the pulley  75  relative to the first drive cable  31  is shallow. The rotation restriction member  117  may be also configured not to include such holding member  100 . In this case, it may be configured that the rotation of the holding member  100  is restricted at the rotation position at which the pulley  75  should apply the tensile force to the first cable  31  and at the rotation position at which the pressing angle of the pulley  75  is shallow on a basis of configurations and arrangements of the first guide grooves  91 ,  92  and the second guide grooves  111 ,  113 . 
     In the aforementioned embodiment, each of the second guide grooves  111  and  113  includes the configuration so that the biasing force is stored at the coil spring  83  retained at the holding member  100  by the movement of the pulley  75  in the separating direction from the first guide grooves  91  and  93 . However, not limited thereto, it may be configured that the biasing force of the coil spring  83  is not changed by the movement of the tension applying member  73  guided by the second guide grooves  111  and  113 . Each of the second guide grooves  111  and  113  may include the configuration so that the biasing force is stored at the coil spring  83  by the movement of the pulley  75  in a direction approaching the guide grooves  91  and  93 . By employing such construction, in a case where the tension applying member  73  is temporarily held, the holding member  100  may easily rotate with the biasing force of the biasing member  74 . 
     In addition, in the aforementioned embodiment, the engagement portion  115  which may engage the tension applying member  73  with each of the second guide grooves  111  and  113  is provided at each of the second guide grooves  111  and  113  at the rotation position of the holding member  100  at which the pressing angle of the tension applying member  73  is shallow. The engagement portion  115 , however, may be not necessarily provided. 
     Further, the rotation shaft  75   a  of the pulley  75  may not be necessarily inserted to be positioned within the first guide grooves  91 ,  93  and the second guide grooves  111 ,  113 . The construction where the first guide grooves  91 ,  93  and the second guide grooves  111 ,  113  are not provided at the housing member may be employed. In this case, for example, it may be configured that the rotation of the holding member  100  may be restricted by the rotation restriction member  117  even at the rotation position at which the pulley  75  should apply the tensile force to the first drive cable  31 . 
     In the aforementioned embodiment, the engagement member  120  includes the outer configuration in a substantially rectangular flat plate. Then, the first and second operation flanges  141  and  142  serving as the operation portions are provided at the longitudinally opposed ends of the engagement member  120 . However, not limited thereto, the configuration of the engagement member  120  may be arbitrarily changed. 
     In the aforementioned embodiment, the engagement member  120  slides on the outer peripheral surface  63   s  of the housing  63  so as to engage and disengage relative to the axial portion  88  of the support member  82  which protrudes at the outer peripheral surface  63   s  of the housing  63  via the penetration bore  121  provided at the peripheral wall  63   d . However, not limited thereto, the engagement member  120  may be configured to be held at the inner side of the housing member, for example. Then, the tension applying member  73  may be configured to engage with the cover member  64 . 
     In the aforementioned embodiment, the engagement member  120  is operated by the pressing of any one of the operation flange  141  serving as the first operation portion protruding to the side of the cover member  64  and the operation flange  142  serving as the second operation portion protruding to the side of the bottom wall  63   c  of the housing  63 . However, not limited thereto, the operation direction of the engagement member  120  may be arbitrarily changed as long as the operation portion is operated in the direction being retracted into the outline of the housing member. 
     In the aforementioned embodiment, the engagement member  120  causes the support member  82  to engage with the housing  63  in a state where the axial portion  88  of the support member  82  serves as the engagement protruding portion. However, not limited thereto, the configuration of the engagement protruding portion may be arbitrarily changed. In such case, as for the insertion bore  130  at the engagement member  120 , the configurations of the first and second bore portions  131  and  132  may be changed so as to conform to the configuration of the engagement protruding portion. 
     Next, technical ideas obtainable by the aforementioned embodiment are described together with their effects. 
     (1) The tension applying apparatus where the tension applying member includes the pulley that is rotatably supported. Accordingly, without disturbing the operation of the drive cable, the tensile force is applicable to the drive cable against which the tension applying member is pressed. 
     (2) The tension applying apparatus where the biasing member serves as the coil spring that generates the biasing force depending on the elastic deformation amount in a state where the biasing member is compressed between the contact surface provided within the housing member and the support member. By employing such construction, the tension applying member is stably and securely biased to be pressed against the drive cable. Then, there is an advantage that the biasing member may be arranged in a compact manner. 
     (3) The tension applying apparatus where the biasing member generates the biasing force depending on the elastic deformation amount, and where the second guide groove includes the configuration so that the biasing force is stored at the biasing member by the movement of the tension applying member along the second guide groove in the direction approaching the first guide groove. 
     According to the aforementioned construction, in a case where the tension applying member is temporarily held, the holding member may easily rotate with the biasing force stored at the biasing member. As a result, the improved operability may be secured. 
     (4) The tension applying apparatus is configured so that the rotation shaft of the pulley inserted to be positioned within the first guide groove and the second guide groove protrudes to the outside of the housing member. According to such construction, the holding member may easily rotate by the operation of the rotation shaft of the pulley protruding to the outside of the housing member. 
     (5) The contact surface is provided at the holding member. According to such construction, regardless of the rotation position of the holding member, the coil spring may maintain a state expanding and contracting in the axial direction. As a result, an appropriate tensile force is applicable to the drive cable against which the tension applying member biased by the coil spring is pressed. 
     (6) The tension applying apparatus includes the tension applying member applying the tensile force to the drive cable by being pressed against the drive cable, the biasing member generating the biasing force for pressing the tension applying member against the drive cable, the housing member housing the tension applying member and the engagement member which may bring the tension applying member to engage with the housing member at a position at which the biasing force is stored at the biasing member, the engagement member including the operation portion protruding from the outline of the housing member, the engagement member releasing the engagement of the tension applying member in a state where the operation portion is operated in a direction being retracted into the outline. 
     According to the aforementioned construction, even when a protruding amount of the operation portion protruding from the outline of the housing member is restrained, the engagement member may be operated easily and securely. As a result, the improved operability may be secured. 
     (7) The tension applying apparatus where the engagement member includes the second operation portion protruding from the outline of the housing member in the direction where the first operation portion is retracted into the outline, and where the engagement member causes the tension applying member to engage with the housing member at the position at which the biasing force is stored at the biasing member in a state where the second operation portion is operated in the direction being retracted into the outline. 
     According to the aforementioned construction, by a simple operation that is intuitively understandable, the engagement operation of the tension applying member with the housing member may be performed. As a result, the improved operability may be secured. 
     (8) The tension applying apparatus is characterized in that the engagement member is configured so that while one of the first and second operation portions is retracted into the outline, the other of the first and second operation portions protrudes from the outline in the retracted direction. 
     According to the aforementioned construction, at the same time as the engagement operation of the tension applying member with the housing member is completed, the preparation operation necessary for releasing the aforementioned engagement state is completed. As a result, with the simple construction, the improved operability may be secured. 
     (9) The tension applying apparatus where the engagement member includes the insertion bore including the first and second bore portions which are continued in the operation direction of the engagement member, where the tension applying member includes the engagement protruding portion inserted to be positioned within the insertion bore at the position at which the tension applying member engages with the housing member, the first bore portion including the configuration which allows insertion and removal of the engagement protruding portion in the moving direction of the tension applying member biased by the biasing member, the second bore portion including the configuration which may restrict removal of the engagement protruding portion in the moving direction of the tension applying member biased by the biasing member in a state where the second bore portion engages with the engagement protruding portion, where the insertion bore is configured so that the engagement protruding portion inserted to be positioned within the insertion bore relatively moves between the first and second bore portions by the operation of the engagement member. 
     According to the aforementioned construction, with the simple construction, the engagement member which may engage the tension applying member with the housing member by operating the second operation portion in the retracted direction and which may release the engagement of the tension applying member by operating the first operation portion in the retracted direction may be provided. 
     (10) The tension applying apparatus where the tension applying member includes the engagement protruding portion at the position at which the biasing force is stored at the biasing member and the housing member includes the wall portion which includes the penetration bore into which the engagement protruding portion is inserted to be positioned, where the engagement member is configured to engage and disengage relative to the engagement protruding portion of the tension applying member inserted to be positioned within the penetration bore by sliding on the wall surface of the wall portion facing an opposite side of the tension applying member. 
     According to the aforementioned construction, with the simple construction, the tension applying member may securely engage with the housing member and such engagement may be securely disengaged by the engagement member.