JP2008189450A - Passenger conveyer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a passenger conveyer provided with a safety device capable of surely detecting elongation of a step chain, drive chain or handrail drive chain. <P>SOLUTION: An escalator 1 is provided with the safety device for detecting elongation of at least one of the step chain 4, drive chain 8, handrail drive primary chain 13 and handrail drive secondary chain 14. The safety device 20A for detecting the handrail drive chains is provided between rollers around which the handrail drive primary chain 13 or the handrail drive secondary chain 14 are wrapped and is provided with an operation piece 21 contacting with the handrail drive chains while energized in a direction perpendicular to a forward direction of the handrail drive primary chain 13 or the handrail drive secondary chain 14 and a detection switch 26 operated when this operation piece 21 displaces to a predetermined position in the direction perpendicular to the forward direction of the handrail drive chain by the elongation of the handrail drive primary chain 13 or the handrail drive secondary chain 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a passenger conveyor provided with a safety device for detecting chain elongation.

  Passenger conveyors such as escalators and moving walkways are provided with a plurality of steps in the passenger conveyor housing called a truss. Each step is connected to an endless step chain, and this step chain is wound around the drive wheel at the turn-back portion at one of the entrances and exits, and is wound around the driven wheel at the turn-back portion at the other entrance / exit. When the driving force is transmitted to the driving wheel from the driving device via the driving chain and driven, the driving wheel circulates between one of the entrances and the other entrance. In addition, moving handrails are provided along the balustrades erected on the left end and the right end of the truss, respectively, and circulate in the same direction at the same speed as the steps. This moving handrail is driven by the handrail driving device to which the driving force is transmitted from the driving device by the handrail driving chain.

  As can be seen from the above description, the passenger conveyor includes a plurality of chains such as a step chain, a drive chain, and a handrail drive chain. These chains grow over time due to wear and the like due to use. Therefore, it is necessary to check periodically to check the degree of chain elongation and to check whether the amount of elongation exceeds a predetermined value. Such an inspection has been performed by an inspector's visual inspection or manual operation. However, the inspection by the inspector's visual inspection or manual operation requires the passenger conveyor to stop operating, and it is necessary to secure some space for inspection by removing some of the plurality of treads. Work time and labor.

  Passenger conveyors are equipped with safety devices that detect chain breakage in order to stop operation when breakage occurs in various chains. However, passenger conveyors equipped with safety devices that detect breakage cannot detect chain elongation that does not lead to breakage. I had to do it.

Regarding a device for detecting the degree of chain extension, a multi-beam light projecting unit that projects a plurality of beams in a vertical direction across a moving handrail drive chain, and a multi-beam light receiving unit that receives a plurality of beams in a vertical direction A device is disclosed that outputs as a detection signal a position where light from a multi-beam light projecting unit is blocked by a moving handrail drive chain and cannot be received by the multi-beam light receiving unit (Patent Document 1).
JP 2006-219220 A

  However, the device that detects the extension of the chain by the multi-beam light projecting unit and the multi-beam light receiving unit described above is vulnerable to dust, and if lubricating oil or other dust supplied to the chain adheres to the multi-beam light receiving unit, There was a risk of misdetecting the attached position as the position of the chain.

  The present invention advantageously solves the above problem, and an object thereof is to provide a passenger conveyor provided with a safety device capable of reliably detecting the extension of a step chain, a drive chain, or a handrail drive chain. .

  The passenger conveyor of the present invention is connected endlessly in the truss, spanned between one entrance / exit and the other entrance / exit, and the endless end connected to each of the steps. A step chain, provided at one turn-up portion of the step chain in the vicinity of one entrance / exit, and provided at a drive wheel around which the step chain is wound, and at the other turn-up portion of the step chain near the other entrance / exit The driven wheel around which the step chain is wound, the driving device provided in the vicinity of the driving wheel, and the output portion of the driving device and the driving wheel are wound around to drive the driving force from the driving device. A drive chain that transmits to the drive wheel, an endless moving handrail that is spanned between one of the entrances and the other entrance and circulates in the same direction in synchronization with the steps; A handrail drive device for driving a handrail, a handrail drive chain for transmitting a drive force from the drive device to the handrail drive device, and an extension of at least one of the step chain, the drive chain, and the handrail drive chain is detected. A safety device, and the safety device is provided between the rollers around which the handrail drive chain is wound, and the handrail drive chain is urged in a direction perpendicular to the traveling direction of the handrail drive chain. And a detection switch that operates when the operating piece is displaced to a predetermined position in a direction perpendicular to the advancing direction of the handrail drive chain due to the extension of the handrail drive chain.

  Further, the passenger conveyor according to the present invention is provided between the output portion of the drive device around which the drive chain is hung and the drive wheel, and urges the safety device in a direction perpendicular to the traveling direction of the drive chain. And a detection switch that operates when the operating piece is displaced to a predetermined position in a direction perpendicular to the advancing direction of the handrail driving chain due to the extension of the driving chain. be able to.

  Furthermore, the passenger conveyor according to the present invention is a handrail drive chain provided in the vicinity of the driven wheel around which the step chain is hung, with the safety device being urged in a direction perpendicular to the traveling direction of the handrail drive chain. And a detection switch that operates when the operating piece is displaced to a specified position in a direction perpendicular to the advancing direction of the handrail drive chain due to the extension of the step chain.

  According to the passenger conveyor of the present invention, the elongation of various chains included in the passenger conveyor can be automatically detected before breaking, and manual inspection work becomes unnecessary.

  Hereinafter, an embodiment of a passenger conveyor of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a main part of an escalator as a passenger conveyor of the present invention. In the figure, an escalator 1 includes a truss 2 as a housing that supports its own weight and passengers, and a plurality of steps 3 are connected endlessly between one entrance and the other entrance in the truss 2. It has been handed over. In FIG. 1, only a part of a plurality of steps is shown for ease of explanation.

  Each step 3 is connected by an endless step chain 4. The step chain 4 is wound around a drive wheel 5 provided in the truss 2 near the upper floor entrance and exit, and is also wound around a driven wheel 6 provided near the lower floor entrance. In addition, the driving wheel 5 and the driven wheel 6 serve as a folded portion of the step chain 4. A drive device 7 is provided in the machine room near the drive wheel 5, and a drive chain 8 is wound around both the output portion 7 a and the drive wheel 5 of the drive device 7. A driving force from the output portion 7a of the driving device 7 is transmitted to the driving wheel by the driving chain 8, and the driving force is transmitted to the step chain 4 wound around the driving wheel at a position different from the driving chain 8. Thus, the steps 3 connected to the step chain 4 are circulated between the upper floor entrance and the lower floor entrance by being guided by a guide rail (not shown).

  Moving handrails 9 that circulate and move in the same direction at the same speed as the steps 3 are provided at both ends of the truss 2 across the steps 3 and are guided by a balustrade (not shown). In the example of the escalator 1 shown in FIG. 1, the handrail driving device 10 that drives the moving handrail is provided in the vicinity of the upper end of the inclined portion of the truss 2. The illustrated handrail drive device 10 is an example of a drive device that drives the handrail belt 9 with rollers. In order to transmit a driving force to the handrail driving device 10, a handrail driving chain is provided between the driving wheel 5 to which the driving force is transmitted from the driving device 7 and the handrail driving device 10. More specifically, a handrail drive sprocket 11 is provided coaxially with the drive wheel 5, and an intermediate wheel 12 is provided between the drive wheel 5 and the handrail drive device 10. A handrail drive primary chain 13 is wound around both the handrail drive sprocket 11 and the intermediate wheel 12, and a handrail drive secondary chain 14 is wound around both the intermediate wheel 12 and the handrail drive device 10. It has been.

  The escalator 1 according to the embodiment of the present invention includes a safety device that detects the elongation of at least one of the step chain 4, the drive chain 8, the handrail drive primary chain 13, and the handrail drive secondary chain 14 described above. This safety device will be described more specifically with reference to the drawings.

  FIG. 2 shows an escalator in the vicinity of which the handrail drive primary chain 13 and the handrail drive secondary chain 14 are provided for explaining a safety device for detecting the extension of the handrail drive primary chain 13 and the handrail drive secondary chain 14. It is a schematic diagram which shows the principal part.

  In FIG. 2, a handrail drive primary chain 13 is wound around a handrail drive sprocket 11 provided in a machine room on the upper floor of the truss 2 and one sprocket of an intermediate wheel 12 provided in the vicinity of the inclined portion of the truss 2. It is hung and circulates between the two. In the middle of the movement path of the handrail driving primary chain 13, a plurality of tension rollers 15 for applying tension to the handrail driving primary chain 13, a guide roller 16 for guiding the handrail driving primary chain 13, and a handrail driving primary chain 13 are provided. A guide plate 17 for guiding is provided. In the illustrated embodiment, the extension of the handrail drive primary chain 13 can be easily detected as a position between the tension roller 15 and the guide plate 17 in the travel path of the handrail drive primary chain 13, the guide roller 16, A safety device 20 </ b> A for detecting the extension of the handrail drive primary chain 13 is disposed between the guide plate 17 and the guide plate 17. These safety devices 20A are attached and fixed to a beam of the truss 2 or an attachment member fixed to the beam.

  Further, the handrail drive secondary chain 14 is wound around a sprocket other than the sprocket around which the above-described handrail drive primary chain of the intermediate wheel 12 is wound, circulates and moves the handrail drive device 10 with a driving force. Communicating. In addition, a tension roller 15 that applies tension to the tension handrail drive secondary chain 14 is disposed on the moving path of the handrail drive secondary chain 14. In the illustrated example, the moving handrail driving device includes a plurality of driving rollers 10a and a plurality of pinch rollers 10b arranged to face the driving rollers 10a. The moving handrail driving device 10 transmits the driving force from the handrail driving secondary chain 14 to the driving roller 10a with the moving handrail 9 being sandwiched between the driving roller 10a and the pinch roller 10b. Is driven with pressure. However, the passenger conveyor provided with the safety device according to the present invention is not limited to the one in which the moving handrail driving device 10 performs the pinching driving as illustrated in FIG.

  In the illustrated embodiment, the handrail drive secondary chain 14 is positioned between the intermediate wheel 12 and the tension roller 15 in the travel path of the handrail drive secondary chain 14 as a position where the extension of the handrail drive secondary chain 14 can be easily measured. A safety device 20A for detecting the extension of the next chain 14 is provided. The safety device 20A is attached and fixed to a beam of the truss 2 or an attachment member fixed to the beam.

  The safety device 20A will be described more specifically with reference to FIG. Drawing 3 is a mimetic diagram of an example of a safety device with which a passenger conveyor concerning the present invention is provided. A safety device 20A shown in FIG. 2A is provided at a rotating body 21 that is in contact with a chain whose elongation is detected and rotates in synchronization with the traveling movement of the chain, and at the rotation center of the rotating body 21. The rotating shaft 22, the rotating shaft 22 is attached to one end, a support bar 23 that rotatably supports the rotating body 21, and the other end of the support bar 23 is attached to the support bar 23. A spring 24 as an elastic body for applying a force in the longitudinal direction to the base plate 25, a base plate 25 for holding the support rod 23 movably in the longitudinal direction, and a base plate 25 attached and fixed to the base plate 25. And a detection switch 26 operated by movement in the longitudinal direction. The rotating body 21 is a sprocket that meshes with the handrail drive primary chain 13 or the handrail drive secondary chain 14 in the illustrated example, but is not limited to a sprocket and may be a roller. The support bar 23 has a detection piece 23a projecting near the detection switch 26 at an arbitrary position on the support bar 23, and a fixing plate 23b is fixed to the end opposite to the end to which the rotary shaft 22 is attached. ing. Further, the base plate 25 has a protruding portion 25 a having a through hole through which the support bar 23 is inserted on the surface facing the support bar 23. The elastic body is a spring 24 in the illustrated example, and is mounted between the fixed plate 23 b of the support bar 23 and the protrusion 25 a of the base plate 25. The detection switch 26 is a switch that operates when the support rod 23 moves in the longitudinal direction to a predetermined position, and a limit switch, a photoelectric switch, a proximity switch, or the like can be used. The detection switch 26 is connected to a control panel, a terminal board, or the like, and outputs a chain predictor signal when the detection switch 26 is operated so that a chain predictor information can be displayed and warned to an elevator administrator. It has become.

  The safety device 20 </ b> A having these members is in contact with the handrail driving primary chain 13 or the handrail driving secondary chain 14 on the side where the rotating body 21 faces the protruding portion 25 a of the base plate 25 with the compression force applied to the spring 24. At such a position, the longitudinal direction of the support bar 23 is attached and fixed in such a direction as to be substantially orthogonal to the traveling direction of the chain. Then, the rotating body 21 is urged by the force that the spring 24 tries to extend, and is pressed against and contacted with the chain that is to detect the extension.

  When the chain elongates due to changes over time, the operating piece including the rotating body 21, the rotating shaft 22, and the support bar 23 is displaced in the longitudinal direction of the support bar 23 from the initial position. Since the operating piece is biased by the spring 24 and is always in close contact with the chain, the displacement of the operating piece has a positive correlation with the chain elongation. Therefore, an appropriate displacement amount such as the displacement amount of the support rod 23 when the chain extends from the initial value to the use limit value is defined as a specified value, and the detection switch 26 operates when the operating piece is displaced to the specified value. Set to Then, before the chain breaks, when the chain stretches to an amount that should notify the passenger conveyor manager of appropriate information about the chain status, such as when the chain stretch reaches the limit of use. In addition, the detection switch 26 operates to output a chain predictor signal, and the chain predictor information is displayed to the elevator manager. Therefore, it is possible to automatically and reliably detect the chain elongation. Since the operating piece is biased by the spring 24 in the safety device 20A in the present embodiment, the operating piece can be displaced more reliably with respect to the chain extension, and the chain extension can be detected with high accuracy. Can do.

  The safety device used in the passenger conveyor of the present invention is not limited to the safety device 20A shown in FIG. The safety device shown in FIGS. 3B and 3C can also be used. In the safety device 20B shown in FIG. 3B, the configuration of the operating piece is the same as the configuration of the operating piece of the safety device 20A, and the detection switch 26 is not fixed to the base plate 25, but in the truss. This is an example in which the detection switch 26 is fixed to another member (not shown) provided near the position where the safety device 20B is attached. 3C, the support bar 23 is attached to the base plate 25 by the fixing pin 27 in the vicinity of the other end so as to be swingable, and the spring 24 is provided so as to contact the side surface of the support bar 23. This is an example in which the support rod 23 is configured to swing around the fixed pin 27 as a rotation center. Even in the example shown in FIG. 3C, the operating piece is urged against and contacted with the chain by the spring 24.

  In the handrail drive primary chain 13 shown in FIG. 2, a safety device 20 </ b> A is provided on each of the travel paths between the handrail drive sprocket 11 and the intermediate wheel 12. This is because the step 3 of the escalator 1 moves in the direction from the lower floor side entrance to the upper floor side entrance, and when the step is down from the upper floor side entrance. This is because the position at which the handrail drive primary chain 13 is stretched is different from that in the case of driving in the downward direction that moves in the direction toward the entrance on the floor side. Since the safety device 20A is provided at each position where elongation occurs in accordance with the circulation direction in the travel path between the handrail drive sprocket 11 and the intermediate wheel 12, in one safety device 20A, the upward direction The extension of the handrail drive primary chain 13 can be detected when the operation is performed, and the other safety device 20A detects the extension of the handrail drive primary chain 13 when the operation is in the downward direction. be able to.

  But the passenger conveyor of this invention is not limited to the example which provides two safety devices 20A according to the driving | running direction of a passenger conveyor as mentioned above with respect to one chain which detects elongation. The safety device 20A is configured such that the step 3 moves in a direction from the lower floor side entrance to the upper floor side entrance and exits, and the position where the chain is detected when driving in the upward direction is It may be provided at any one of the positions where it moves in the direction from the floor side entrance / exit to the lower floor side entrance / exit and detects the chain elongation when driving in the downward direction. . For example, when the safety device 20A is provided at a position for detecting the extension of the chain when operating in the upward direction, the safety device 20A detects the extension of the chain as it is when operating in the upward direction. Can do. Further, the chain elongation during the downward operation can be detected by the chain elongation that occurs instantaneously when the downward operation is stopped. Therefore, by providing the safety device 20A at a position where one of the upstream and downstream directions is detected, it is possible to detect the chain elongation in both the upstream and downstream directions.

  In FIG. 2, one safety device 20 </ b> A is provided on the handrail drive secondary chain 14. The safety device 20 </ b> A has the same configuration as the safety device A provided in the handrail drive primary chain 13. By providing one safety device 20A, it is possible to detect the extension of the handrail drive secondary chain 14 in both the upward direction and the downward direction in the manner described above.

  FIG. 4 is an example in which the moving handrail driving device 10 is provided in the horizontal portion on the upper floor side of the truss 2. In FIG. 4, the same members as those shown in FIG. A handrail drive primary chain 13 and a handrail drive secondary chain 14 are provided to transmit a driving force to the moving handrail drive device 10 shown in FIG. A safety device 20A and a safety device 20C for detecting the extension of the handrail drive primary chain 13 and the handrail drive secondary chain 14 are provided at positions where the extension of each chain can be easily measured and fixed to the beam of the truss 2. It is being fixed to the attached attachment member. These safety device 20A and safety device 20C are the same as those shown in FIG.

  Also in the passenger conveyor provided with the moving handrail drive device 10 shown in FIG. 4, the safety device 20 </ b> A and the safety device 20 </ b> C are provided in the handrail drive primary chain 13 and the handrail drive secondary chain 14, respectively. Can be detected automatically and reliably. In the example shown in FIG. 4, the sprocket of the intermediate wheel 12 around which the handrail drive secondary chain 14 is wound is located at the lowermost part of the moving path of the handrail drive secondary chain 14. Therefore, when the handrail drive secondary chain 14 is stretched, the amount of engagement between the sprocket of the intermediate wheel 12 and the handrail drive secondary chain 14 is reduced. Therefore, the safety device 20A for detecting the extension of the handrail drive secondary chain 14 is provided, and the fact that the extension of the chain can be predicted by the safety device 20A is that the passenger conveyor provided with the moving handrail drive device 10 shown in FIG. Especially effective.

  In addition, the safety device provided in the handrail drive primary chain 13 and the handrail drive secondary chain 14 is not limited to the one shown in FIG. FIG. 5 is a schematic diagram illustrating another example of a safety device provided in the handrail drive secondary chain 14. The safety device shown in FIG. 5 has a rod 15a fixed to the rotating shaft of the tension roller 15 and displaced along with the movement of the tension roller 15, a detection piece 28 fixed to the rod 15a, and a beam in the vicinity of the detection piece 28. And a detection switch 29 that is activated when the detection piece 28 is displaced by a predetermined amount. The tension roller 15 is wound around the handrail drive secondary chain 14 while being biased by a spring (not shown) in order to apply tension to the handrail drive secondary chain 14. It is displaced by the elongation of. Therefore, the detection piece 28 is provided on the rod 15 a attached to the tension roller 15, and the displacement can be detected by the detection piece 28 and the detection switch 29 due to the extension of the handrail drive secondary chain 14 of the tension roller 15. Thus, when the handrail drive secondary chain 14 is extended to an amount to report appropriate information, the detection switch 29 is operated, a chain predictor signal is output, and chain predictor information is displayed to the elevator manager. Is possible.

  Next, a safety device for detecting the extension of the drive chain 8 will be described with reference to FIG. FIG. 6 is a schematic diagram showing the main part of the escalator in the vicinity where the drive chain 8 is provided. In FIG. 6, the drive chain 8 is wound around the output portion 7 a of the drive device 7 provided in the machine room at the upper floor side end portion of the truss 2 and the drive wheel 5 provided in the vicinity of the drive device. Then, the drive force of the drive device 7 is transmitted to the drive wheels 5 by circulating between them. In the illustrated embodiment, the safety device 30 </ b> A that detects the extension of the drive chain 8 is positioned so that the extension of the drive chain 8 can be easily detected. Between the drive wheel 5 and the drive wheel 5. The safety device 30A is attached and fixed to a beam of the truss 2 or an attachment member fixed to the beam.

  The safety device 30A will be described with reference to the schematic diagram shown in FIG. FIG. 7A is a side view and FIG. 7B is a front view. 7A and 7B, the safety device 30A is in contact with a drive chain 8 whose elongation is detected, and a sliding body 31 that slides relatively as the drive chain 8 travels, A support bar 33 having a sliding body 31 fixed to one end thereof, a spring 34 attached to the back surface of the support bar 33 and applying a longitudinal force to the support bar 33, and a reverse A base plate 35 having an L-shaped cross-sectional shape, one end of which is fixed to the lower beam of the truss 2 or a mounting member (not shown), is fixedly attached to the base plate 35, and the support bar 33 is moved in the longitudinal direction. And a detection switch 36 that operates. A detection piece 33a protrudes from the back surface of the support bar 33, and the detection switch 36 is activated by the displacement of the detection piece 33a. The spring 34 is mounted between the detection piece 33 a of the support bar 33 and the upper end of the base plate 35. As the detection switch 36, a limit switch, a photoelectric switch, a proximity switch, or the like can be used. The detection switch 36 is connected to a control panel, a terminal board, or the like, and outputs a chain predictor signal when the detection switch 36 is operated so that a chain predictor information can be displayed and warned to an elevator administrator. It has become.

  The safety device 30A provided with these members is positioned so that the sliding body 31 is in contact with, for example, the bush of the drive chain 8 with the compression force applied to the spring 34, and the longitudinal direction of the support bar 33 is the drive chain. 8 is fixed in a direction almost perpendicular to the direction of travel. Then, the sliding body 31 is urged by the force that the spring 34 tries to extend, and is pressed against and contacted with the drive chain 8 that is to detect the extension.

  When the drive chain 8 elongates due to changes over time, the operating piece composed of the sliding body 31 and the support bar 33 is displaced from the initial position in the longitudinal direction of the support bar 33 as shown in FIG. Since the operating piece is urged by the spring 34 and is always in close contact with the drive chain 8, an appropriate amount of displacement such as the amount of displacement of the support rod 33 when the drive chain 8 extends from the initial value to the use limit value. It is set as a specified value, and the detection switch 36 is set to operate when the operating piece is displaced to the specified value. Then, before the drive chain 8 breaks, the drive chain 8 is driven to an amount that should report appropriate information about the chain status to the passenger conveyor manager, such as when the extension amount of the drive chain 8 reaches the use limit value. When the chain 8 is extended, the detection switch 36 is operated to output a chain predictor signal, and the chain predictor information is displayed to the elevator manager. Therefore, it is possible to automatically and reliably detect the chain elongation. Since the operating piece is biased by the spring 34 in the safety device 30A in this embodiment, the operating piece can be displaced more reliably with respect to the chain extension, and the chain extension can be detected with high accuracy. Can do.

  Although FIG. 6 shows an example in which one safety device 30A is provided, the position where elongation occurs when the escalator 1 is operating in the upward direction and the elongation when the escalator 1 is operating in the downward direction are shown. A safety device 30A can also be provided at each of the resulting positions.

The safety device used for the drive chain 8 is not limited to the safety device 30A shown in FIGS. FIG. 9 shows another safety device 30B. The safety device 30B shown in FIG. 9 is fixed to a sliding body 31 that is brought into contact with the drive chain 8 and relatively slides as the drive chain 8 travels, and a truss lower beam or a mounting member (not shown). The fixed member 32, the sliding member 31 is supported at one end so as to be swingable, the support bar 33 is supported swingably on the fixed member 32, and the traveling direction of the drive chain 8 is supported by the sliding member 31. A spring 34 as an elastic body for applying an orthogonal force and an inverted L-shaped cross-section, the spring is attached to the upper end, and the lower end is fixed to the lower beam of the truss 2 or an attachment member (not shown) And a detection switch 36 that is provided in the vicinity of the other end of the support bar 33 and that operates by swinging of the support bar 33. The spring 34 is mounted in a compressed state between the sliding body 31a and the upper end of the base plate 35. The sliding body 31a is urged by the spring 34 and pressed against the drive chain 8, and is always in contact with the drive chain 8. When the drive chain 8 elongates due to changes over time, the position of the sliding body 31a is lowered, and one end portion of the support bar 33 connected to the sliding body 31a has a center of rotation as an attachment portion with the fixing member 32. And the position of the other end of the support bar 33 is raised. Therefore, the detection switch 36 is set so that the detection switch 36 operates when the other end of the support bar 33 is displaced upward to a predetermined position. As a result, when the drive chain 8 is extended to a predetermined amount, the detection switch 36 is actuated, a chain predictor signal is output, and chain predictor information can be displayed to the elevator manager. Further, the safety device 30B of the present embodiment shown in FIG. 9 includes the distance from the attachment portion of the support bar 33 to the fixing member 32 to the attachment portion of the sliding body 31a, and the detection switch 36 from the attachment portion to the fixing member 32. By adjusting the ratio to the distance to the end where the drive chain is operated, it is possible to adjust the sensitivity for detecting the extension of the drive chain 8. In any case, the detection switch 36 needs to be set to operate before the chain breakage detection device 40 provided in the drive chain 8 operates. Otherwise, it is meaningless to detect the extension of the drive chain 8. The chain breakage detecting device 40 includes a weight 41 that abuts against the drive chain 8 by its own weight and slides relatively by the circulating movement of the drive chain 8, a support body 42 that supports the weight 41 so as to be swingable, A fixing pin 43 that supports the support 42 in a swingable manner with respect to the beam of the truss 2, a stopper 44 that is fixed to the support 42 and swings around the fixing pin 43, and a drive wheel 5 are mounted coaxially. The ratchet wheel 45 is provided. When the drive chain 8 is broken, the weight 41 swings around the fixing pin 43, and the stopper 44 fits into the groove of the ratchet wheel 45 due to the swing of the weight 41, thereby rotating the drive wheel 5. Stop.

  Since the weight 41 of the chain breakage detection device 40 is in close contact with the drive chain 8 by its own weight, a device for detecting the displacement of the weight 41 accompanying the extension of the drive chain 8 is configured, and according to the present invention. Although it is possible to use a safety device that detects the extension of the drive chain 8, since the weight 41 is heavy and the sensitivity for detecting the displacement is low, the safety device 30A shown in FIGS. The safety device 30B shown in FIG. 9 is more suitable.

  Next, a safety device for detecting the extension of the step chain 4 will be described with reference to FIG. FIG. 10 is a schematic view of the vicinity of the driven wheel 6 where the step chain 4 is folded back. In FIG. 10, the step chain 4 is wound around a driven wheel 6 provided in a horizontal portion on the lower floor side of the truss 2. A step chain tensioning device 50 is provided to absorb vibration generated when the step chain 4 is wound around the driven wheel 6 and circulates, and to apply tension to the step chain 4. The step chain tensioning device 50 includes a bearing 51 that rotatably supports the rotating shaft 6 a of the driven wheel 6, a carriage 52 on which the bearing 51 is placed, and the wheels of the carriage 52 to guide the carriage 52. A rail 53 that is movable in the front-rear direction, a fixed plate 54 erected on the carriage 52, a rod 55 that is fixed to the fixed plate 54 and extends rearward from the driven wheel 6, and a spring attached to the rod 56, a first stopper 57 that spans the vertical beam of the truss 2 and restricts the movement of the spring 56, and a second stopper 58 that is attached to the rod 55 and restricts the movement of the spring 56. . In this step chain tension device 50, the spring 56 is compressed between the first stopper 57 and the second stopper 58, and the force that the compressed spring 56 tries to extend from the rod 55 to the carriage 52. By being transmitted and pulling the carriage 52 rearward, a rearward tension is applied to the driven wheel supported by the bearing 51 placed on the carriage 52, and thereby, the tension is applied to the step chain 4.

  In the vicinity of the step chain tensioning device 50, a chain breakage detection device 60 is provided for detecting the breakage of the step chain 4 when the step chain 4 is broken. The chain breakage detecting device 60 is fixed to the rod 55 in the vicinity of the second stopper attached to the rod 55 as shown in FIG. A fixed piece 61, a corrugated piece 62 fixed to one end of the fixed piece, and a limit switch 63 attached so that the corrugated piece 62 is in contact therewith. When the step chain 4 is broken, the rod 55 moves in the forward direction due to the tension of the spring 56 of the step chain tensioning device 50. Therefore, the movement of the rod 55 is detected by the limit switch 62.

  In the present embodiment, a safety device 70 that detects the extension of the step chain is provided in the vicinity of the chain breakage detection device 60. As shown in FIG. 11, the safety device 70 includes an operating piece 71 fixed to the rod 55 and a detection switch 72 that is operated by a longitudinal displacement parallel to the axial direction of the rod of the operating piece 71. is doing. The detection switch 72 is set to operate when the chain extends and the operating piece 71 is displaced to a predetermined value so that the detection switch 72 operates with priority over the limit switch 63 of the chain breakage detection device 60. As the detection switch 72, a limit switch, a photoelectric switch, a proximity switch, or the like can be used. The detection switch 72 is connected to a control panel, a terminal board, or the like, and outputs a chain predictor signal when the detection switch 72 is actuated so that the chain manager information can be displayed and warned to the elevator manager. It has become.

  The step chain 4 is tensioned by the step chain tensioning device 50. Therefore, by providing the safety device 70 on the rod 55 of the step chain tensioning device 50, the elongation of the chain can be reliably detected. Then, an appropriate amount of displacement such as the amount of displacement of the working piece 71 fixed to the rod 55 when the step chain 4 extends from the initial value to the use limit value is defined as a prescribed value, and the working piece is displaced to this prescribed value. In such a case, the detection switch 72 is set to operate. Then, before the step chain 4 is broken, the step of the step chain 4 to the amount that should report appropriate information to the passenger conveyor manager such as when the extension amount of the step chain 4 reaches the use limit value. When the chain is extended, the detection switch 72 is activated to output a chain predictor signal, and the chain predictor information is displayed to the elevator manager. Therefore, it is possible to automatically and reliably detect the chain elongation.

  Another example of the safety device for detecting the extension of the step chain will be described with reference to FIG. 12 is an enlarged view showing a region A in the vicinity of the tip of the step chain tensioning device 50 shown in FIG. In the present embodiment shown in FIG. 12, one end of the corrugated piece 62 of the chain breakage detecting device 60 is extended to form a corrugated detection piece 74, and a limit switch for detecting chain elongation is provided on the detection piece 74. 74 is provided. The chain extension detection limit switch 74 is activated when the chain is extended and the operating piece 71 is displaced to a predetermined value so as to operate with priority over the limit switch 63 of the chain breakage detection device 60. Is set. Even with such a configuration, an appropriate amount of displacement, such as the amount of displacement of the working piece 71 fixed to the rod 55 when the step chain 4 extends from the initial value to the use limit value, is defined as a specified value, By setting the limit switch 74 to operate when displaced to this specified value, when the step chain is extended to an amount that should notify the passenger conveyor manager of appropriate information about the chain status, the limit switch 74 74 operates to output a chain predictor signal and display chain predictor information to the elevator manager. Therefore, it is possible to automatically and reliably detect the chain elongation.

  As mentioned above, although embodiment of the passenger conveyor of this invention was described using drawing, the passenger conveyor of this invention is not limited to illustrated embodiment, Many within the range included in the meaning of this invention. Deformation is possible. Moreover, the passenger conveyor of this invention can be applied not only to the escalator 1, but also to a moving sidewalk.

It is a schematic diagram which shows the principal part of an escalator. It is a schematic diagram which shows the principal part of the escalator of the vicinity in which the handrail drive chain is provided. It is a mimetic diagram of an example of a safety device with which a passenger conveyor concerning the present invention is provided. It is a schematic diagram which shows the principal part of the escalator of the vicinity in which the handrail drive chain is provided. It is a schematic diagram which shows another example of the safety device provided in a handrail drive secondary chain. It is a schematic diagram which shows the principal part of the escalator of the vicinity in which the drive chain is provided. It is a schematic diagram which shows the example of the safety device provided in a drive chain. It is explanatory drawing of operation | movement of the safety device provided in a drive chain. It is a schematic diagram which shows another example of the safety device provided in a drive chain. It is a schematic diagram of the vicinity of a driven wheel where a step chain is folded back. It is an enlarged view of the front-end | tip part vicinity of a step chain tension apparatus. It is an enlarged view of the front-end | tip part vicinity of a step chain tension apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Escalator 2 Truss 3 Step 4 Step chain 5 Drive wheel 6 Driven wheel 7 Drive device 8 Drive chain 9 Moving handrail 10 Handrail drive device 13 Handrail drive primary chain 14 Handrail drive secondary chain 20A, 20B, 20C Safety device 30A, 30B Safety Device 70 Safety device

Claims (5)

A plurality of steps connected endlessly in the truss and circulated between one entrance and the other entrance and circulating;
An endless step chain connected to each of the steps;
A drive wheel provided at one turn-back portion of the step chain in the vicinity of one of the entrances and exits, and on which the step chain is wound;
A driven wheel provided on the other folded portion of the step chain in the vicinity of the other entrance and exit, on which the step chain is wound,
A driving device provided in the vicinity of the driving wheel;
A drive chain that is wound around both the output portion of the drive device and the drive wheel, and that transmits the drive force from the drive device to the drive wheel;
An endless moving handrail that is spanned between one entrance and the other entrance and circulates in the same direction in synchronization with the steps,
A handrail driving device for driving the moving handrail;
A handrail drive chain that transmits a driving force from the drive device to the handrail drive device; and a safety device that detects an extension of at least one of the step chain, the drive chain, and the handrail drive chain;
And having
The safety device is provided between the rollers around which the handrail drive chain is wound, and an operating piece that comes into contact with the handrail drive chain in a state of being biased in a direction perpendicular to the traveling direction of the handrail drive chain,
A passenger conveyor, comprising: a detection switch that operates when the operating piece is displaced to a specified position in a direction perpendicular to a traveling direction of the handrail drive chain by extension of the handrail drive chain. A plurality of steps connected endlessly in the truss and circulated between one entrance and the other entrance and circulating;
An endless step chain connected to each of the steps;
A drive wheel provided at one turn-back portion of the step chain in the vicinity of one of the entrances and exits, and on which the step chain is wound;
A driven wheel provided on the other folded portion of the step chain in the vicinity of the other entrance and exit, on which the step chain is wound,
A driving device provided in the vicinity of the driving wheel;
A drive chain that is wound around both the output portion of the drive device and the drive wheel, and that transmits the drive force from the drive device to the drive wheel;
An endless moving handrail that is spanned between one entrance and the other entrance and circulates in the same direction in synchronization with the steps,
A handrail driving device for driving the moving handrail;
A handrail drive chain that transmits a driving force from the drive device to the handrail drive device; and a safety device that detects an extension of at least one of the step chain, the drive chain, and the handrail drive chain;
And having
The safety device is provided between an output portion of a drive device around which the drive chain is wound and a drive wheel, and is in contact with the drive chain while being urged in a direction perpendicular to the traveling direction of the drive chain. With a piece,
A passenger conveyor comprising: a detection switch that operates when the operating piece is displaced to a predetermined position in a direction perpendicular to a traveling direction of the handrail driving chain by extension of the driving chain. A plurality of steps connected endlessly in the truss and circulated between one entrance and the other entrance and circulating;
An endless step chain connected to each of the steps;
A drive wheel provided at one turn-back portion of the step chain in the vicinity of one of the entrances and exits, and on which the step chain is wound;
A driven wheel provided on the other folded portion of the step chain in the vicinity of the other entrance and exit, on which the step chain is wound,
A driving device provided in the vicinity of the driving wheel;
A drive chain that is wound around both the output portion of the drive device and the drive wheel, and that transmits the drive force from the drive device to the drive wheel;
An endless moving handrail that is spanned between one entrance and the other entrance and circulates in the same direction in synchronization with the steps,
A handrail driving device for driving the moving handrail;
A handrail drive chain that transmits a driving force from the drive device to the handrail drive device; and a safety device that detects an extension of at least one of the step chain, the drive chain, and the handrail drive chain;
And having
The safety device is provided in the vicinity of a driven wheel around which the step chain is hung, and an operating piece that contacts the handrail drive chain in a state of being biased in a direction perpendicular to the traveling direction of the handrail drive chain,
A passenger conveyor comprising: a detection switch that operates when the operating piece is displaced to a predetermined position in a direction perpendicular to the traveling direction of the handrail drive chain by extension of the step chain.   The safety device detects a chain extension when the step moves in a direction from one entrance / exit to the other entrance / exit, and the step moves in a direction from the other entrance / exit to the one exit / exit. The passenger conveyor according to any one of claims 1 to 3, wherein the passenger conveyor is provided at each position where the chain elongation is detected.   The safety device detects a chain extension when the step moves in a direction from one entrance / exit to the other entrance / exit, and the step moves in a direction from the other entrance / exit to the one exit / exit. The passenger conveyor according to any one of claims 1 to 3, wherein the passenger conveyor is provided at any one of positions where chain elongation is detected.

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