Patent Publication Number: US-6341683-B1

Title: Moving walk

Description:
BACKGROUND 
     The present invention relates to a moving walk which can safely and rapidly transfer a passenger over a long distance. 
     For example, in the case of a moving walk disposed in a place such as an airport, when it is driven at a speed of 30 m per minute or 40 m per minute, there has been a problem that it takes too long to move the passenger due to the low speed. 
     Then, a new type of moving walk which slowly moves at a platform for the passenger and fast moves at a middle portion has been desired, and a moving walk as shown in the following description has been suggested in Japanese Patent Kokai Publication No. 2-75594. 
     FIG. 2 is a schematic view which shows a moving walk constituted by a plurality of endless circulating belts, and FIG. 3 is a partly enlarged view of FIG.  2 . 
     In the drawing, reference numerals  2  and  2 ′ denote an independent module which is structured such that an endless sliding belt  20  having a small thickness and being significantly flexible passes under a pair of guide rollers  25  and is always driven by a drive roller  30  at a constant speed, and it is set that among them, a module  2  disposed near the platform moves at a low speed and a module  2 ′ disposed at a position apart from the platform moves at a high speed as it is apart from the platform, so that a passenger is gradually accelerated or decelerated when the passenger transfers to the adjacent modules  2  and  2 ′. 
     Accordingly, the module  2  has a platform belt and the module  2 ′ has an accelerating and decelerating belt. 
     Reference numeral  15  denotes a small diameter roller disposed at both ends of the module  2  or  2 ′ in such a manner as to be apart therefrom and having a significantly small diameter, for example, about 30 mm to 70 mm, and an effective interval between the adjacent portions in an above track is restricted to a size of about 20 mm to 40 mm, smaller than a length of a very small shoe such as a child shoe. 
     Reference numeral  10  denotes a transfer plate having a T-shaped cross section and disposed in an interval between each pair of the adjacent modules  2  or  2 ′ in such a manner that the above surface is positioned lower than the upper surface of the endless sliding belt  20 , and it is described that the transfer body  10  may be omitted in the case that the circulating speed of the endless sliding belt is high. 
     Reference numeral  26  denotes a sliding plate for supporting and guiding the above track of the endless sliding belt  20 , and reference numeral  27  denotes a long main circulating belt moving at a highest speed in an adjacent manner to the high speed module  2 ′ and constituting a center portion of the moving walk. 
     However, in the case of the conventional variable speed type moving walk mentioned above, there have been the following problems. 
     1) A mechanism for driving the belt in each of the modules in a relational manner becomes complex. 
     2) Since the belt is always supported and guided by the sliding plate, even in the case that there is no passenger, a loss is produced due to a sliding friction. 
     3) It is not completely made clear how long and what speed of the module is optimum and what combination of the modules is optimum, for safety of the transferred passenger, or how a moving handrail for safely guiding the passenger is arranged. 
     4) The lower the circulating speed of the endless sliding belt  20  is, the smaller the interval between the opposing small diameter rollers  15  have to be made, however, when the transfer plate  10  is inserted, the interval is made wide, so that there is a risk that the passenger transferred in a standing attitude slips on a rotating portion at the small diameter roller  15  of the endless sliding belt  20  close to a receiving side, thereby obstructing a smooth transfer,. Further, when the length of the modules  2  and  2 ′ in an accelerating and decelerating area is too short, it is considered that a tall passenger completely steps over one module in one stride, in this case, the passenger suddenly moves from the slow endless sliding belt to the endless sliding belt moving at a faster speed (or the reversed case), so that the passenger staggers and it is very dangerous. 
     The present invention is made by taking each of the problems mentioned above into consideration, and an object is to provide a variable speed type moving walk having a simple structure and mechanism, capable of safely and smoothly transferring a passenger, presenting little fear of stumbling when the passenger walks. 
     SUMMARY OF THE INVENTION 
     The present invention is made by taking the problems mentioned above into consideration, and is characterized by including the following structures. 
     (1) A moving walk structured such that an independent platform belt and one or some accelerating and decelerating belts are successively disposed adjacent to an operating direction in front of and at the rear of a main circulating belt, the belts are operated in the same direction, an operating speed of the belt disposed at a boarding portion is successively made high in accordance that the belt reaches a moving direction, an operating speed of the belt disposed at a debarking portion is successively made low in an inverted manner, and an operating speed of the main circulating belt is made highest with respect to the belts at the embarking and debarking portions, in which: 
     a) the belt disposed at the debarking portion or the belt disposed at the boarding portion is driven through the main circulating belt; and/or, 
     b) a moving body for absorbing an extension and compression of the main circulating belt is provided in a returning end of the main circulating belt in such a manner as to freely move in a longitudinal direction of the main circulating belt. 
     (2) The moving body for absorbing an extension and compression of the transferring belt is provided in a returning end of the transferring belt wound around two spaced apart rollers in an endless manner in such a manner as to freely move in a longitudinal direction of the transferring belt. 
     (3) In the structure in which an above track of the transferring belt wound around two spaced apart rollers in an endless manner is supported and guided by a sliding plate, a hole is provided in the sliding plate and a partly guiding member is provided in the hole in such a manner as to freely project. 
     (4) In the structure in which at least two sets of modules provided with a first roller and a second roller disposed apart from each other and having a small diameter, drive means, and an endless belt passing over the first roller and the second roller and driven by the drive means are closely disposed in series with respect to a longitudinal direction in such a manner that the first roller and the second roller are opposed: 
     a) at least one of the opposing first roller and second roller is supported in such a manner as to freely move to a vertical direction; and/or, 
     b) a center portion of at least one of the modules is supported in such a manner as to freely rotate, a member to be guided is provided in a lower surface near the first roller and the second roller, and the member to be guided is guided and supported by a movable support body having a projecting portion; and/or, 
     c) a length of each of the modules is set to be a length which cannot be stepped over in one stride even by a tall passenger. 
     (5) In the structure in which at least two sets of modules provided with a first roller and a second roller disposed apart from each other, drive means, and an endless belt passing over the first roller and the second roller and driven by the drive means are disposed in series with respect to a longitudinal direction, and the endless belt of each of the modules is circulated at a different speed, 
     a) a moving handrail moving at about an average speed of the endless belts circulating at different speeds is disposed at both side portions of each of the modules; or, 
     b) a moving handrail is disposed at both side portions of each of the modules, and the moving handrail is moved at a speed which cancels a leading action and a lagging action of the transferred body with respect to the transfer at the length and the circulating speed in the endless belt of each of the modules. 
     In accordance with the invention having the structure mentioned above, a belt system in which the circulating belt, having a necessary speed, can be efficiently obtained from a single drive source or a limited number of drive source, and even when the length of the belt becomes long, a suitable tension can be always obtained, further, since the moving handrail is disposed in such a manner that the leading action and the lagging induction operation can be appropriately canceled with respect to the movement of the passenger by the circulating belt and each of the circulating belts is relatively disposed in such a manner that the passenger can be transferred from the sending side to the receiving side between the modules in a smooth manner. Accordingly, a moving walk which is trouble free even when the operating direction becomes inverted can be obtained. 
     Further, a safe moving walk presenting little fear of stumbling or staggering even when the passenger walks on the belt with long strides can be obtained. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     FIG. 1 is a side elevation view which shows an overview of an embodiment in accordance with the invention; 
     FIG. 2 is a schematic view which shows a conventional moving walk; 
     FIG. 3 is a partly enlarged view of FIG. 2; 
     FIG. 4 is a plan view of FIG. 1; 
     FIGS.  5 ( a ) and  5 ( b ) are overviews which show a drive mechanism for each of the belts in FIG. 1, in which (a) is a side elevation view and (b) is a plan view; 
     FIGS.  6 ( a ) and  6 ( b ) are enlarged views of a P portion in FIGS.  5 ( a ) and  5 ( b ), in which (a) is an enlarged view of FIG.  5 ( a ) and ( b ) is an enlarged view of FIG.  5 ( b ); 
     FIGS.  7 ( a ) and  7 ( b ) are enlarged views which show a supporting and guiding mechanism for a belt in accordance with the invention; 
     FIG. 8 is an enlarged view which shows a mechanism of a suitable tensioning apparatus for a main circulating belt  27  in FIG.  1  and FIG. 6; 
     FIG. 9 is a plan view of FIG. 8; 
     FIG. 10 is an enlarged view of a Q portion in FIG. 1; 
     FIG. 11 is a view which shows a drive mechanism for third and fourth endless sliding belts  24  and  25  and a moving handrail  33 ; 
     FIG. 12 is an enlarged view which shows a relation of an arrangement of a small diameter roller opposing in each of the modules in accordance with the invention; 
     FIG. 13 is a view which shows a height position adjusting mechanism for the small diameter roller in accordance with the invention; 
     FIGS.  14 ( a )- 14 ( e ) are side elevation views which show a state of an eccentric shaft of the small diameter roller in accordance with an embodiment of the invention; 
     FIGS.  15 ( a ) and  15 ( b ) are side views which show another mechanism for finely adjusting a height position of the small diameter roller in accordance with the invention; 
     FIG. 16 is a view as seen from a line X—X in FIG.  15 ( b ); 
     FIGS.  17 ( a ) and  17 ( b ) are views which show the other mechanism for finely adjusting a height position of the small diameter roller in accordance with the invention; 
     FIG. 18 is an overview which shows an example of an arrangement of an adjustable module  2 ″; and 
     FIGS.  19 ( a ) and  19 ( b ) are views which show an embodiment in the case that the invention is applied to plural groups of modules. 
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     As mentioned above, the invention provides a structure and a mechanism for a moving walk for smoothly transferring a passenger, and an embodiment in accordance with the invention is described below with reference to the drawings, however, the invention is not limited to these embodiments. 
     FIG. 1 is a side elevation view which shows an overview of an embodiment in accordance with the invention, and shows a relation of an arrangement between belts and moving handrails. FIG. 4 is a plan view of FIG.  1 , FIGS.  5 ( a ) and  5 ( b ) show a drive mechanism for each of the belts in FIG. 1, FIGS.  6 ( a ) and  6 ( b ) are an enlarged views of a portion P in FIGS.  5 ( a ) and  5 ( b ), and FIGS.  7 ( a ) and  7 ( b ) are enlarged views of a supporting and guiding mechanism for a belt. In the drawings, reference numeral  11  denotes a balustrade panel provided in a standing manner on both side surfaces in such a manner as to extend over a platform belt  21  (moving at a speed of V 1  in a circulating manner) facing a floor plate  10  disposed in a platform portion of a moving walk and a first endless sliding belt  22  (moving at a speed of V 2  in a circulating manner) disposed adjacent to the platform belt  21 , and reference numeral  31  denotes a moving handrail provided in such a manner as to surround a periphery of the balustrade panel  11 . 
     Reference numeral  12  denotes a balustrade panel provided in a standing manner on both side surfaces of a second endless sliding belt  23  (moving at a speed of V 3  in a circulating manner), and reference numeral  32  denotes a moving handrail provided in such a manner as to surround the periphery of the balustrade panel  12 . 
     Reference numeral  13  denotes a balustrade panel provided in a standing manner on both side surfaces in such a manner as to extend over a third endless sliding belt  24  (moving at a speed of V 4  in a circulating manner) and a fourth endless sliding belt  25  (moving at a speed of V 5  in a circulating manner) disposed adjacent thereto, and reference numeral  33  denotes a moving handrail provided in such a manner as to surround a periphery of the balustrade panel  13 . 
     Reference numeral  14  denotes a balustrade panel provided in a standing manner on both side surfaces of a main circulating belt  27  (moving at a speed of V 6  in a circulating manner), and reference numeral  34  denotes a moving handrail provided in such a manner as to surround the periphery of the balustrade panel  14 . 
     Reference numeral  11 ′ denotes a balustrade panel provided in a standing manner on both side surfaces in such a manner as to extend over a platform belt  21 ′ (moving at a speed of V 1  in a circulating manner) facing a floor plate  10 ′ disposed in an opposite side and a first endless sliding belt  22 ′ (moving at a speed of V 2  in a circulating manner) disposed adjacent to the platform belt  21 ′, and reference numeral  31 ′ denotes a moving handrail provided in such a manner as to surround a periphery of the balustrade panel  11 ′. 
     Further, reference numeral  12 ′ denotes a balustrade panel provided in a standing manner on both side surfaces of a second endless sliding belt  23 ′ (moving at a speed of V 3  in a circulating manner), and reference numeral  32 ′ denotes a moving handrail provided in such a manner as to surround the periphery of the balustrade panel  12 ′. 
     Still further, reference numeral  13 ′ denotes a balustrade panel provided in a standing manner on both side surfaces in such a manner as to extend over a third endless sliding belt  24 ′ (moving at a speed of V 4  in a circulating manner) and a fourth endless sliding belt  25 ′ (moving at a speed of V 5  in a circulating manner) disposed adjacent thereto, and reference numeral  33 ′ denotes a moving handrail provided in such a manner as to surround a periphery of the balustrade panel  13 ′. 
     In all or a part of the platform belts  21  and  21 ′, the endless sliding belts  22 ,  22 ′,  23 ,  23 ′,  24 ,  24 ′,  25  and  25 ′ and the main circulating belt  27 , the above track is supported and guided by a sliding plate  26 ′ in the same manner as that of the conventional structure. However, in the sliding plate  26 ′, for example, as shown in FIG. 7, a hole  26 ′ a  is provided in some portions, and a partly guiding member, that is, a rotatable roller  27   a  or a low frictional sliding member  27   b  or the like is provided in the hole  26 ′ a  in such a manner as to freely project (by a spring pressure of a spring  27   c ), so that it is structured such that, in the case that the passenger does not ride on the belt ( 21  to  25 ,  21 ′ to  25 ′ and  27 ), the belt is guided by the partly guiding member so as to transfer with a significantly small frictional loss. On the contrary, in the case that the passenger rides on the belt, the partly guiding member is pressed downward so as to enter in the hole  26 ′ a , whereby the belt is firmly guided on the sliding plate  26 ′. 
     Then, a number, a length and a moving speed V 1  to V 6  (having a relation of V 1 &lt;V 2 &lt;V 3 &lt;V 4 &lt;V 5 &lt;V 6 ) of the platform belts  21  and  21 ′, the respective endless sliding belts  22 ,  22 ′,  23 ,  23 ′,  24 ,  24 ′,  25  and  25 ′ and the main circulating belt  27  are suitably set in accordance with the circumstances to provide graduated acceleration and a desired terminal speed of the main circulating belt  27 . 
     Next, reference numeral  41  denotes a drive roller for the platform belt  21 , reference numeral  42  denotes a drive roller for the first endless sliding belt  22 , reference numeral  43  denotes a drive roller for the second endless sliding belt  23 , reference numeral  44  denotes a drive roller for the third endless sliding belt  24 , reference numeral  45  denotes a drive roller for the fourth endless sliding belt  25 , reference numeral  46  denotes a drive roller for the main circulating belt  27 , reference numeral  46 ′ denotes a driven roller for the main circulating belt  27 , reference numeral  45 ′ denotes a drive roller for the fourth endless sliding belt  25 ′, reference numeral  44 ′ denotes a drive roller for the third endless sliding belt  24 ′, reference numeral  43 ′ denotes a drive roller for the second endless sliding belt  23 ′, reference numeral  42 ′ denotes a drive roller for the first endless sliding belt  22 ′, and reference numeral  41 ′ denotes a drive roller for the platform belt  21 ′, respectively. 
     Further, in FIG. 5, reference numeral  51  denotes a drive apparatus for a moving walk arranged in a machine room, reference numeral  52  denotes a reduction gear connected to a shaft of the drive apparatus  51 , reference numeral  53  denotes a sprocket driven by the drive apparatus  51  through the reduction gear  52 . 
     Reference numeral  46   a  denotes a sprocket for a main drive which is rotatably provided in a coaxial manner with the drive roller  46  of the main circulating belt  27  and transmits power to the drive roller  46 , and a main chain  54  is wound around the sprocket  53  and the sprocket  46   a.    
     Reference numeral  41   a  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  41  and transmits power to the drive roller  41 , reference numeral  42   a  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  42  and transmits power to the drive roller  42 , reference numeral  43   a  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  43  and transmits power to the drive roller  43 , reference numeral  44   a  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  44  and transmits power to the drive roller  44 , reference numeral  45   a  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  45  and transmits power to the drive roller  45 , and reference numeral  46   b  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  46  and the sprocket  46   a , respectively, and a belt drive chain  47  is wound around each of the sprockets  46   b ,  45   a ,  44   a ,  43   a ,  42   a  and  41   a  so that it is structured such that a drive force of the sprocket  46   a  for the main drive is transmitted to each of the belts. 
     A diameter of the sprockets  41   a  to  46   a  and  46   b  is selected in accordance with the moving speed V 1  to V 6  of each of the belts. 
     On the contrary, reference numeral  41 ′ a  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  41 ′ and transmits power to the drive roller  41 ′, reference numeral  42 ′ a  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  42 ′ and transmits power to the drive roller  42 ′, reference numeral  43 ′ a  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  43 ′ and transmits power to the drive roller  43 ′, reference numeral  44 ′ a  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  44 ′ and transmits power to the drive roller  44 ′, reference numeral  45 ′ a  denotes a sprocket which is rotatably provided in a coaxial manner with the drive roller  45 ′ and transmits power to the drive roller  45 ′, and reference numeral  46 ′ a  denotes a sprocket which is rotatably provided in a coaxial manner with the driven roller  46 ′, respectively, and a belt drive chain  47 ′ is wound around each of the sprockets  46 ′ a ,  45 ′ a ,  44 ′ a ,  43 ′ a ,  42 ′ a  and  41 ′ a  so that it is structured such that a rotating force of the driven roller  46 ′ is transmitted to each of the belts. 
     Accordingly, the power of the drive apparatus  51  is transmitted to the endless sliding belts  21 ′,  22 ′,  23 ′,  24 ′ and  25 ′ through the main chain  54 , the sprocket  46   a , the drive roller  46 , the main circulating belt  27 , the driven roller  46 ′, the sprocket  46 ′ a , and the belt drive chain  47 ′. Then, in the sprockets  41 ′ a  to  46 ′ a , a diameter in accordance with the moving speed V 1  to V 6  of each of the belts is selected. 
     In this case, the main circulating belt  27  having the highest speed in the central portion of the moving walk is wound around rollers  60  and  60 ′ rotatably disposed on both ends apart from each other as shown in FIG. 6, for example, having a diameter of about 80 mm, a returning portion thereof is wound around the drive roller  46  and the driven roller  46 ′ disposed apart from each other and a middle portion thereof is guided by guide rollers  61  and  62 . 
     Then, reference numeral  70  denotes a moving roller provided in such a manner as to freely move in a longitudinal direction of the belt, and this includes a tensioning apparatus for absorbing an extension and a compression of the main circulating belt  27  wound around there and adjusting a tensile force of the main circulating belt  27 . 
     A length of the main circulating belt  27  is determined by a total length of the moving walk, however, for example, in the case that a distance of the transfer surface is about 100 m, even when an extension rate of the belt is supposed to be 2%, a condition that a size of about 2 m is required to be absorbed by the movement of the moving roller  70  exists. 
     Next, FIG. 8 is an enlarged view which shows a mechanism for absorbing an extension and a compression of the main circulating belt  27  in FIG.  1  and FIG.  6  and adjusting a tensile stress of the main circulating belt  27 , and FIG. 9 is a plan view of FIG.  8 . 
     In the drawings, the same reference numerals as those in FIG. 6 denote the same elements, reference numeral  71  denotes an electric motor with a torque limiter  71   a , reference numeral  71   b  denotes a sprocket fixed to a shaft of the electric motor  71  through the torque limiter  71   a , and reference numeral  72  denotes a sprocket rotatably provided in a space close to the moving roller  70 , and a drive chain  73  is wound around the sprocket  71   b  and the sprocket  72 . 
     Reference numerals  74  and  75  denote a pair of sprockets rotatably provided on both ends in a coaxial manner with the sprocket  72  and in a separated manner, and a pair of sprockets  74 ′ and  75 ′ are rotatably provided in a space opposite thereto with the moving roller 70 therebetween. 
     Reference numeral  76  denotes a chain wound around the sprockets  74  and  74 ′, an end thereof is fixed to a moving body  80  with the moving roller  70 , and the other end is fixed to a spring apparatus  81 . The moving body  80  is structured such as to freely move to a horizontal direction (a longitudinal direction of the main circulating belt  27 ). 
     Reference numeral  77  denotes a chain wound around the sprockets  75  and  75 ′, an end thereof is fixed to the moving body  80  with the moving roller  70 , and the other end is fixed to a spring apparatus  82 . 
     Reference numeral  78  denotes a rod member in which an end is fixed to the moving body  80  and another end is fixed to a moving piece  81   a  within the spring apparatus  81 , and the moving piece  81   a  is restricted by a spring  81   b  installed therein. 
     Reference numeral  79  denotes a rod member in which an end is fixed to the moving body  80  and another end is fixed to a moving piece  82   a  within the spring apparatus  82 , and the moving piece  82   a  is restricted by a spring  82   b  installed therein. 
     In the structure mentioned above, when the electric motor  71  is driven in such a manner that the sprocket  71   b  rotates to a counterclockwise direction in FIG. 8, the drive chain  73  is leftward circulated so as to rotate the sprocket  72  in a counterclockwise direction and rotate the sprockets  74  and  75 , coaxially disposed, in a counterclockwise direction, so that the chains  76  and  77  are both circulated leftward so as to move the spring apparatus  81  and  82  in a rightward direction. 
     Then, the springs  81   b  and  82   b  within the spring apparatus  81  and  82  are compressed so as to press each of the moving pieces  81   a  and  82   a  in a rightward direction and move the moving body  80  through the rod members  78  and  79  in a rightward direction, so that the moving roller  70  is moved in the rightward direction so as to absorb slackness due to an extension of the main circulating belt  27 , and when the moving roller  70  is further moved in the rightward direction, a tensile force necessary for the main circulating belt  27  can be generated. 
     In this case, when it is structured such that in the case that a predetermined limited torque is set by the torque limiter  71   a  (concretely speaking, is set by rotating the bolt) and the transmission plate installed therein is slipped, after detecting that, a supply voltage to the electric motor  71  is shut and a brake is operated, a necessary tensile force can be previously produced prior to the operation of the moving walk. 
     Accordingly, since the moving body  80 , provided with the moving roller  70 , is maintained in a state of being restricted by a spring force of the springs  81   b  and  82   b  of the spring apparatus  81  and  82 , which are stopped at a predetermined position at a time of applying the brakes to the electric motor  71 , the main circulating belt  27  is in a state that a predetermined tensile force is continuously applied during an operation of the moving walk. 
     Accordingly, even when the main circulating belt  27  itself is used for transmitting the power, no inconvenient matter is produced. 
     Since the moving direction of the moving body  80  is a horizontal direction, a great size of a unit of some meters can be naturally prepared, so that the depth of the total apparatus can be restricted to the utmost. 
     Further, in accordance with the structure of the apparatus mentioned above, during the stop of the moving walk, when the electric motor  71  is driven in such a manner as to rotate the sprocket  71   b  to a clockwise direction which corresponds to an opposite direction to that of the case mentioned above in FIG. 8, each of the members moves to the opposite direction to that of the case mentioned above and the moving body  80  is moved leftward, so that the tensioned state of the main circulating belt  27  can be canceled and an unnecessary tensile force can be canceled. 
     Accordingly, in the case of stopping the moving walk for a long time such as night and the like, since the unnecessary force is not applied to the main circulating belt  27 , extension of the main circulating belt  27  itself can be restricted to the utmost. 
     Here, in the case that an excess tensile force is applied to the main circulating belt  27  during the operation of the moving walk, the transmission plate of the torque limiter  71   a  is slipped so as to serve to immediately release the excess tensile force. 
     By always checking a length of the spring  81   b  or  82   b  within the spring apparatus  81  or  82 , the electric motor  71  is driven so as to increase the tensile force of the belt to a predetermined tensile force when the length of the spring becomes longer than a predetermined value (that is, when an extension is produced in the belt, concretely speaking, detected by a limit switch or the like), and an operation of always keeping the tensile force of the belt, during the operation, within a fixed range can be performed. 
     Further, in the case that the length of the spring becomes enough long to be returned to a natural length, it is determined that the belt is completely broken, then the drive of the belt itself is stopped so that it is possible to secure safety of the passenger. 
     As mentioned above, in accordance with the embodiment, the circulating belt having a necessary speed can be efficiently obtained from a single drive source or a limited number of drive sources, and a belt system in which a suitable tension can be always obtained even when the length of the belt becomes long can be constituted. 
     Next, as to each of the moving handrails  31 ,  32 ,  33 ,  34 ,  33 ′,  32 ′ and  31 ′, the moving handrail  31  is moved in a circulating manner substantially at an average speed (V 1 +V 2 )/2 between the moving speed V 1  for the platform belt  21  and the moving speed V 2  for the first endless sliding belt  22 , the moving handrail  32  is moved in a circulating manner at the same speed as that for the second endless sliding belt  23 , the moving handrail  33  is moved in a circulating manner substantially at an average speed (V 4 +V 5 )/2 between the moving speed V 4  for the third endless sliding belt  24  and the moving speed V 5  for the fourth endless sliding belt  25 , and the moving handrail  34  is moved in a circulating manner at the same speed as that for the main circulating belt  27 . 
     Further, the moving handrail  31  ′ is moved in a circulating manner substantially at an average speed (V 1 +V 2 )/2 between the moving speed V 1  for the platform belt  21 ′ and the moving speed V 2  for the first endless sliding belt  22 ′, the moving handrail  32 ′ is moved in a circulating manner at the same speed as that for the second endless sliding belt  23 ′, the moving handrail  33 ′ is moved in a circulating manner substantially at an average speed (V 4 +V 5 )/2 between the moving speed V 4  for the third endless sliding belt  24 ′ and the moving speed V 5  for the fourth endless sliding belt  25 ′. 
     In the moving walk in accordance with the invention, in order to make it possible to operate to the opposite direction, a replacing portion of the moving handrails  31 ,  32 ,  33 ,  34 ,  33 ′,  32 ′ and  31 ′ and a connecting portion of the endless sliding belts  22 ,  23 ,  24 ,  25 ,  27 ,  25 ′,  24 ′,  23 ′ and  22 ′ are disposed in such a manner as to be just opposed. 
     For length L 1  to L 5  and the moving speed V 1  to V 6  (having a relation of V 1 &lt;V 2 &lt;V 3 &lt;V 4 &lt;V 5 &lt;V 6 ) of the platform belts  21  and  21 ′ and the respective endless sliding belts  22 ,  22 ′,  23 ,  23 ′,  24 ,  24 ′,  25  and  25 ′, for example, a design value of L 1 =L 2 =L 4 =L 5 =830 mm, L 3 =2620 mm, V 1 =50 m/min, V 2 =62.4 m/min, V 3 =78.6 m/min, V 4 =99 m/min, V 5 =118.8 m/min and V 6 =150 m/min is considered. The length of the main circulating belt  27  is suitably set by taking the total length of the moving walk into consideration. In this case, since the module can be made common, the cost can be restricted to the utmost. 
     In the case that the length of the adjacent belts is equal, when the moving speed of the moving handrail is set substantially to an average value between the speed of the respective belts, the leading action and the lagging action can be substantially canceled with respect to the movement of the passenger by the belt. 
     Further, the respective length L 1  to L 5  of the platform belts  21  and  21 ′ and the endless sliding belts  22 ,  22 ′,  23 ,  23 ′,  24 ,  24 ′,  25  and  25 ′ can be set to a different length, for example, L 1 =830 mm, L 2 =1040 mm, L 3 =2620 mm, L 4 =1650 mm and L 5 =1980 mm. 
     In this case, the module is less made common, however, the transfer time for the passenger on the platform belts  21  and  21 ′, the first endless sliding belts  22  and  22 ′ and the third and fourth endless sliding belts  24 ,  24 ′,  25  and  25 ′ is evened to about 1 second, so that when the moving speed for each of the moving handrails is set to be the average speed for the respective belts, the leading action and the lagging action can be theoretically canceled. Of course, the length of a step surface belt may be set in such a manner that all the transfer time for the passenger on the first to fifth endless sliding belts is even. 
     As mentioned above, the length of the belt and the moving speed of the moving handrail can be set in various patterns, however, it is preferable to set the length of the belt and the moving speed of the moving handrail in such a manner that a difference between the belt and the moving handrail is within 400 mm (the range within 16 inch is set as a recommendation by ANSI). 
     Next, FIG. 10 is an enlarged view of a Q portion in FIG.  1  and FIG. 11 is a view which shows a drive mechanism for the third and fourth endless sliding belts  24  and  25  and the moving handrail  33 , however, the opposite portion corresponding to the Q portion has the same structure and in the case of the platform belts  21  and  21 ′, the first endless sliding belts  22  and  22 ′ and the third and fourth endless sliding belts  24 ′ and  25 , the same drive mechanism is employed, so that detailed drawings are omitted. 
     In the drawings, the same reference numerals as those of FIG. 1, FIG.  5  and FIG. 6 denote the same elements, reference numeral  74  denotes a sprocket rotatably provided in a coaxial manner with the drive roller  44  mentioned above, and this serves to transmit the power to the moving handrail  33 . 
     Reference numeral  80  denotes a known gripping and pressing drive apparatus for driving the moving handrail  33  by gripping and pressing, this includes drive rollers  80   a  and  80   b , driven rollers  80   c  and  80   d  and sprockets  80   e  and  80   f  coaxially disposed with the drive rollers  80   a  and  80   b , and a chain  80   g  transmitting power is wound around the sprockets  74 ,  80   e  and  80   f . Then, it is structured such that the moving speed of the moving handrail  33  with respect to the endless sliding belt  24  is accelerated by suitably determining a diameter of each of the rollers and the sprockets. 
     Reference numeral  81  denotes a guide roller, and reference numeral  82  denotes a tension roller for adjusting a tensile force of the moving handrail. 
     Since the drive mechanism for the moving handrail  31  is performed by a speed increasing mechanism similar to a case mentioned above, the detailed explanation is omitted. 
     Further, a method of driving the endless sliding belt  23 , the main circulating belt  27  and the moving handrails  32  and  34  is the same and it is sufficient to replace the diameter of the rollers and the sprockets by a uniform mechanism not accelerated, so that the detailed explanation will be omitted. 
     In accordance with the above structure, since the circulating belt of the moving handrail having a necessary speed can be obtained from a single drive source or a limited number of drive sources in a significantly simple manner, it is convenient. Further, since the moving handrail having a speed such as to cancel the leading action and the lagging action with respect to the movement by the circulating belt can be disposed on both side surfaces of the circulating belt, a preventative effect with respect to a turnover accident is significant. 
     As mentioned above, in accordance with the embodiment mentioned above, a variable speed type moving walk in which the moving handrail is disposed in such a manner as to suitably cancel the leading action and the lagging action with respect to the movement of the passenger by the circulating belt is provided. Even when the operating direction of the moving walk is inverted, no problem is produced. 
     Next, FIG. 12 is an enlarged view which shows a relation of an arrangement of a small diameter roller in accordance with the invention, reference numeral  15   a  denotes a small diameter roller in a module  2   a  at a sending end and reference numeral  15   b  denotes a small diameter roller in a module  2   b  at a receiving end. A height position of a central shaft  16   b  of the small diameter roller  15   b  is positioned at a position slightly lower than a height position of a central shaft  16   a  of the small diameter roller  15   a , and the respective endless sliding belts  20   a  and  20   b  are disposed at different levels, so that the passenger passing through the interval can be smoothly transferred. 
     In this case, in the moving walk, it is preferable to optionally switch the moving direction in the same manner as the case of an escalator. However, when the height positions of the adjacent small diameter rollers are fixed so that a difference in level is initially provided, there is produced a problem that the passenger cannot be smoothly transferred to the inverted direction. Accordingly, when the height position of the small diameter roller can be finely adjusted in accordance with the operating direction of the moving walk, a moving walk having a significant usefulness is obtained. 
     FIG. 13 is a plan view which shows an example of a mechanism for finely adjusting the height position of the small diameter roller. 
     In the drawing, reference numeral  15 ′ denotes a small diameter roller in which a height position can be finely adjusted, the rotating shaft  16  of this small diameter roller  15 ′ is eccentric at a degree of about a radial size of the small diameter roller  15 ′, for example, to a horizontal direction, both ends thereof are rotatably supported by bearings  17 . The small diameter roller  15 ′ itself is rotatably mounted to the rotating shaft  16 . A gear  18  is fixed to one end of the rotating shaft  16 , and a small diameter gear  19  directly connected to a motor (not shown) is meshed with the gear  18 . 
     Accordingly, it is sufficient that in the case that the small diameter roller  15 ′ is in the receiving end, the rotating shaft  16  is rotated through the small diameter gear  19  and the gear  18  to the direction that the horizontal position is below the small diameter roller  15  of the opposing sending end, on the contrary, in the case that the small diameter roller  15 ′ is in the sending end, the rotating shaft  16  is rotated a necessary amount to the direction that the horizontal position is above the small diameter roller  15  of the opposing receiving end. 
     In this case, since the tension degree of the endless sliding belt  20  is automatically adjusted by an idle roller in a known manner even when the position of the small diameter roller  15 ′ is moved, there is no case that a problem is produced. 
     In accordance with the mechanism mentioned above, as to the difference in level between the small diameter roller  15 ′ and the small diameter roller  15 , it is significantly easy to adjust in accordance with the circulating speed of the endless sliding belt  20 , that is, the higher the speed is, the smaller the difference in level is, and the slower the speed is, the relatively larger the difference in level is. 
     In the case that the rotating shaft  16  of the small diameter roller  15 ′ is eccentric to the horizontal direction shown in FIG.  14 ( a ) as in the embodiment, the small diameter roller  15 ′ moves to the direction in which the interval between the small diameter roller  15 ′ and the adjacent small diameter roller  15  slightly increases when the small diameter roller  15 ′ is finely adjusted to any of the up and down directions. However, for example, by making the rotating shaft  16  eccentric to an oblique direction, it can be easily performed that at the same time of moving the small diameter roller  15 ′ to the lower direction, the interval with respect to the adjacent small diameter roller  15  is further shortened (the case of FIG.  14 ( b )), or at the same time of moving the small diameter roller  15 ′ to the upper direction, the interval with respect to the adjacent small diameter roller  15  is shortened (the case of FIG.  14 ( c )), so that it is convenient. 
     In the above explanation, the example in which only one of the opposing small diameter rollers is structured to be movable has been mentioned, however, it is possible to make both the opposing small diameter rollers a movable structure in a similar manner (for example, the case of FIG.  14 ( d ) or FIG.  14 ( e )) so that more fine adjustment can be performed. Further, it is possible to structure the small diameter roller in such a manner as to freely move in a rotatable manner through the longitudinal bracket using an oil hydraulic apparatus. 
     On the contrary, a length of one of the modules  2  and  2 ′ in accordance with the invention is set to be a length which even the tall passenger cannot step over in one stride. Thus, a moving walk in which a plurality of modules  2  and  2 ′ are disposed in series provides a safe moving walk on which a passenger is smoothly accelerated and decelerated by successively riding adjacent modules  2  and  2 ′ such that any passenger walks on the moving walk is accommodated. A step of a person is about 600 mm on average, even in the case of a tall person of 180 cm in height, it is considered that the step is not perhaps over 800 mm. 
     Accordingly, it is judged that a standard of the length of the module is considered to be set about 800 mm. 
     Next, another embodiment in accordance with the invention will be described below with reference to the drawings. FIGS.  15 ( a ) and ( b ) are views which show a mechanism for finely adjusting the height position of the small diameter roller, FIG. 16 is a view as seen from a line X—X of FIG.  15 ( b ), in the drawings, reference numeral  100  denotes a support table for supporting the total module  2 , which is rotatably mounted around a support point of an R portion in a center portion, and guide rollers  100   a  and  100   b  are rotatably provided at a downward projecting portion in both ends. 
     Reference numeral  200  denotes a moving stand provided in a connecting direction of the module  2  in such a manner as to be freely moved by a drive mechanism, for example, a rack and pinion and the like, this has projecting portions  200   a  and  200   b  on both ends, and is structured in such a manner as to guide the guide rollers  100   a  and  100   b  on the upper surface. 
     Accordingly, in the case that the transfer direction of the passenger is an A direction as shown in FIG.  15 ( a ), the support table  100  of the module  2  is set by moving the moving stand  200  in a leftward direction so as to mount the guide roller  100   b  on the projecting portion  200   b.    
     Then, the small diameter roller in the sending end of each of the modules  2  is disposed in a high position and the small diameter roller in the receiving end is relatively disposed in a low position, so that the passenger can be transferred in a significantly smooth manner. 
     On the contrary, in the case that the transfer direction of the passenger is a B direction, which is inverted to the preceding case, as shown in FIG.  15 ( b ), the support table of the module  2  is set by moving the moving stand  200  in a rightward direction so as to mount the guide roller  100   a  on the projecting portion  200   a.    
     Then, the small diameter roller in the sending end of each of the modules  2  is disposed in a high position and the small diameter roller in the receiving end is relatively disposed in a low position, so that the passenger can be always transferred in a significantly smooth manner as in the same manner as that mentioned above. 
     In the explanation mentioned above, an example in which a relative position between the small diameter roller in the sending end and the small diameter roller in the receiving end is changed by adjusting an inclination amount of the support table  100  supporting the module  2  through the guide rollers  100   a  and  100   b  has been mentioned, however, as shown in FIG. 17 (FIG.  17 ( b ) is a view as seen from a line Y—Y of FIG.  17 ( a )), even in a simple structure which is structured such that simple sliding member  100 ′ a  and  100 ′ b , for example, made of plastics and the like, is provided on the lower surface of the support table  100 ′, on the contrary, in the moving support body  200 ′, for example, an L-shaped angle  201  is supported by a load support member  202  all between the small diameter rollers of one module  2  in such a manner as to freely move to a longitudinal direction, and that the angle  201  is driven, for example, by a known electric cylinder  203 , and that cams  200 ′ a  and  200 ′ b  are provided on an upper surface of the angle  201  so as to press up any of the sliding members  100 ′ a  and  1000 ′ b  by an engagement between the sliding members  100 ′ a  and  100 ′ b  of the support table  100 ′ and the cams  200 ′ a  and  2000 ′ b  of the moving support body  200 ′ and to suitably incline the support table  100 ′, no problem is actually produced when a frequency of operating this mechanism is a few. 
     A difference in level between the modules has an important meaning as the circulating speed of the endless sliding belt  20  is slow, and since a difference in level is not required in the area having a fast circulating speed, in the case of the movable speed type moving walk constituted by a plurality of modules  2  and  2 ″ as shown in FIG. 18, for example, it is considered to make a structure capable of adjusting a height of only the module  2 ″. Of course, it does not matter if all the modules  2  and  2 ″ are made in a structure capable of being adjusted. 
     In order to make a plurality of modules of a structure capable of being adjusted in height as mentioned above, as an example, a structure as shown in FIG. 19 is used (FIG.  19 ( b ) is a view as seen from a line Z—Z of FIG.  19 ( a )). 
     In the drawings, the same reference numerals as those of FIG. 17 denote the same elements, however, reference numerals  201   a  and  201   b  denote an angle member separately disposed in both right and left side portions of the endless sliding belt  20 , and this is a longitudinal member extending over a plurality of modules  2  and  2 ″. 
     The angle members  201   a  and  201   b  are slidably supported by the load support member  202  in the same manner as in the case of FIG.  17 . Then, the angle member  201   a  is directly driven by the electric cylinder  203 . 
     Reference numeral  211   a  denotes a rack provided in a central portion of the angle member  201   a  and the rack is provided in the angle member  201   b  end in the same manner. 
     Reference numeral  204  denotes a shaft disposed in such a manner as to extend between the angle members  201   a  and  201   b , and pinions  204   a  and  204   b  meshed with the rack  211   a  of the angle member  201   a  and the rack of the angle member  201   b  are rotatably mounted to both ends thereof. 
     Then, cams  300 ′ a   1 ,  300 ′ b   1 ,  300 ′ a   2  and  300 ′ b   2  are provided at a predetermined position of the module for adjusting the height on the upper surface of the angle members  201   a  and  201   b.    
     Accordingly, when the electric cylinder  203  is operated so as to move the angle member  201   a  in a necessary direction, that is, a left direction or a right direction of FIG. 19, the angle member  201   b  is also moved in the same direction as that of the angle  201   a  by the rack and pinion mechanism in the central portion, as a result, the cam  300 ′ b   1  and  300 ′ b   2 , or  300 ′ a   1  and  300 ′ a   2  presses upwardly the corresponding sliding member in the support table  100 ′ so that only the predetermined module  2  ″has a necessary inclination. 
     As mentioned above, in accordance with this embodiment, the transfer of the passenger from the sending end of each of the modules to the receiving end can be performed in a significantly smooth manner. The moving walk does not produce any problem even when the operating direction is inverted. Further, a safe moving walk in which even when the passenger walks on the belt in a wide stride, the passenger does not stumble or stagger can be obtained. 
     The moving walk in accordance with the invention can move the passenger at a high speed as mentioned above, and can be operated in the inverted direction. Further, there is a little risk that the passenger stumbles and staggers when the passenger walks on the belt, so that a high safety is achieved. Still further, no particularly complex mechanism is required, and a manufacture can be performed at a relatively low cost. Accordingly, it is suitable for setting in a wide place, for example, an airport.