JP6272750B2 - Escalator with abnormal lowering prevention device - Google Patents

Description

  The present invention relates to an escalator with an abnormal lowering prevention device, and more particularly, to an escalator with an abnormal lowering prevention device that prevents the lowering of a step when the step attempts to lower abnormally.

  An escalator is a device that arranges a plurality of steps connected endlessly between an upper floor and a lower floor, and rotates the endless steps to transport users on the steps. The step has a pair of drive rollers that are front wheels guided by the drive rail, and a pair of follow rollers that are rear wheels guided by the follow rail, and the drive roller has a step shaft extending in the width direction of the step. The step shafts of the steps that are rotatably supported and are adjacent to each other in the running direction are respectively connected to the endless step chain. For example, in Patent Document 1, a step chain is wound between an upper sprocket provided in a machine room on an upper floor side in a truss and a lower sprocket provided on a lower floor side, and an upper sprocket and an output shaft of a drive motor are connected to each other. A structure is described in which a drive chain is wound around and the drive power of the drive motor is transmitted to the endless step chain via the drive chain and the upper sprocket by driving the drive motor.

JP 2011-195267 A

  The escalator is provided with various detection devices and safety devices for the safety of the user. For example, when the drive chain spanned between the output shaft of the drive motor described in Patent Document 1 and the upper sprocket is damaged, the upper sprocket is rotated abnormally by a mechanical mechanism in addition to the electrical safety device. A safety device is provided to prevent this. In this way, the escalator is protected by multiple safety devices. However, if for some reason, none of these safety devices work effectively, or if there is a delay in time, the upper sprocket will malfunction. Rotating, the step chain is self-propelled, and the weight of the user who is carrying it may drop abnormally. This is because the escalator connects the upper and lower floors in a straight line, and there is no place to stop in the middle.

  An object of the present invention is to provide an escalator with an abnormal lowering prevention device that prevents a step from descending abnormally when the step is going to descend abnormally with a new structure.

  The escalator with an abnormal descent prevention device according to the present invention is provided between an upper floor and a lower floor of a building by connecting a plurality of steps and each step shaft extending in the width direction of each step in an endless loop shape. A step chain, a pair of drive rollers arranged at a first arrangement interval along the step axis for each step, and an arrangement interval provided inside the pair of drive rollers along the width direction for each step A pair of variable following rollers, a pair of drive rails provided at a first arrangement interval between the upper and lower floors of the building to guide the rotation of the pair of drive rollers of each step, and the upper floor of the building A pair of follower rails provided between the lower floor and guiding the rotational travel of the pair of follower rollers of each step, the second arrangement interval in the upper and lower sections of the intermediate section between the upper and lower floors of the building Placed in the middle section A pair of follower rails that continuously decrease from the second arrangement interval at the start position to become the minimum arrangement interval, then continuously increase from the second arrangement interval to the second arrangement interval at the end position of the intermediate section And a fixed interval that fixes the disposition interval of the follower roller based on an abnormal descent detection signal that detects that the speed of the driving roller or follower roller on the step side on which the user rides exceeds a predetermined threshold fluctuation range on the descending side. And the pair of follower rollers are rotatable around an axis perpendicular to the upper surface of the follower rail according to the guide of the follower rail.

  In the escalator with an abnormal lowering prevention device according to the present invention, the intermediate section preferably has a section length in which at least two or more steps are always present.

  In the escalator with an abnormal lowering prevention device according to the present invention, the interval varying means for varying the arrangement interval of the pair of follower rollers is arranged in the width direction within the roller interval holding portion provided along the width direction of the step for each follower roller. A movable element, an arm that is integrated with the movable element and protrudes from the roller interval holding part, a roller holder that rotatably holds the rolling rotation shaft of the follower roller, and a roller holding part provided at the tip of the arm. And a vertical axis of rotation that holds the tool rotatably about an axis perpendicular to the top surface of the tracking rail.

  In the escalator with an abnormal descent prevention device according to the present invention, it is preferable that the interval fixing unit includes a movement restricting unit that constrains the movement of the moving element of the interval varying unit when the abnormal descent detection signal is output.

  In the escalator with an abnormal descent prevention device according to the present invention, the shape of the intermediate section is preferably any one of a partial arc shape, a partial ellipse shape, or a shape indicated by a predetermined curved function shape.

  Further, the escalator with an abnormal descent prevention device according to the present invention preferably has a rotation speed detection means for detecting the rotation speed of the follower roller, and an abnormality detection signal is output based on a detection value of the rotation speed detection means. .

  The arrangement interval of the pair of follower rails of the escalator with an abnormal descent prevention device according to the present invention is continuously reduced from the second arrangement interval of the start position in the intermediate section between the upper floor and the lower floor of the building. After reaching the minimum arrangement interval, the arrangement interval continuously increases and returns to the second arrangement interval at the end position of the intermediate section. That is, the following rail does not connect the upper and lower floors linearly but has a kind of curved locus in the intermediate section. The arrangement interval along the width direction of the pair of follower rollers is variable so that the step moves in the middle section of the curved locus in the same way as a normal escalator, and it is perpendicular to the upper surface of the follower rail according to the guide of the follower rail. It can be rotated around a certain axis. When the speed of the driving roller or follower roller on the step side on which the user rides abnormally falls on the step exceeding a predetermined threshold fluctuation range on the descending side, the interval between the follower rollers is fixed.

  As a result, the follower roller cannot follow the follower rail having a kind of curved trajectory, and cannot move any further by hitting the curved wall surface. Therefore, it is possible to prevent the step when the step is going to descend abnormally.

  Further, in the escalator with an abnormal lowering prevention device according to the present invention, the intermediate section has a section length in which at least two or more steps are always present, and therefore, a plurality of steps connected in an endless loop shape by one step chain. Among them, at least two steps are on the tracking rail of the curved trajectory of the intermediate section. Accordingly, when the step is abnormally lowered, the movement of the step in the intermediate section is stopped at that time, and therefore, the entire abnormality of the plurality of steps connected in an endless loop shape can be prevented.

  Further, in the escalator with an abnormal descent prevention device according to the present invention, the means for changing the arrangement interval of the pair of follower rollers rotates the moving element and arm movable in the width direction of the step, and the rolling rotation shaft of the follower roller. It includes a roller holder that freely holds, and a vertical rotation shaft that is provided at the tip of the arm and rotatably holds the roller holder. Accordingly, the follower roller can move along the curved locus of the follower rail.

  Further, in the escalator with an abnormal descent prevention device according to the present invention, when the abnormal descent detection signal is output, the movement of the moving element of the interval varying means is restricted, so that the following roller on the curved trajectory of the following rail is curved. Cannot move along the trajectory.

  Moreover, in the escalator with an abnormal descent prevention device according to the present invention, the shape of the intermediate section is any one of a partial arc shape, a partial ellipse shape, or a shape indicated by a predetermined curved function shape. Sometimes the follower roller can move along the follower rail, and when the abnormal lowering detection signal is output, the follower roller cannot move along the follower rail.

  Further, in the escalator with an abnormal descent prevention device according to the present invention, an abnormality detection signal is output based on the rotation speed of the follower roller. The abnormal lowering is stopped by stopping the movement of the follower roller. Therefore, the movement of the follower roller can be quickly stopped by detecting the abnormality with the follower roller.

It is a structural diagram of a general escalator. It is a figure which shows the structure around the step of the escalator with an abnormal fall prevention apparatus in embodiment which concerns on this invention. FIG. 3 is a detailed view of FIG. 2. 3A is a top view, FIG. 3B is a front view, and FIG. 3C is a partially enlarged view. It is a figure which shows the drive rail and tracking rail of the escalator with an abnormal fall prevention apparatus in embodiment which concerns on this invention. It is a figure which shows the threshold value fluctuation range of the escalator with an abnormal fall prevention apparatus in embodiment which concerns on this invention. In these figures, the horizontal axis represents time, and the vertical axis represents the traveling speed of the follower roller. Fig.5 (a) is a figure which shows the case where an escalator descends abnormally while transporting a user from the lower floor to the upper floor, and (b) is used from the upper floor to the lower floor. It is a figure which shows the case where an abnormal fall arises during transportation of a person. It is operation | movement explanatory drawing of the escalator with an abnormal fall prevention apparatus in embodiment which concerns on this invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. The shapes, dimensions, and the like described below are illustrative examples, and can be appropriately changed in accordance with the specifications of the escalator. Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a diagram showing the structure of a normal escalator 10. The escalator with an abnormal lowering prevention device according to the present embodiment is characterized by the configuration related to the abnormal lowering prevention device as described in FIG. 2 and the subsequent drawings, and the basic structure as an escalator is the same as that of an ordinary escalator 10. Therefore, the structure of the normal escalator 10 will be described with reference to FIG.

  The escalator 10 is an elevating and conveying device that carries a user on a plurality of steps 16 that move between an entrance 12 on the upper floor of the building and an entrance 14 on the lower floor. A railing 18, a handrail 20 and a skirt guard 22 are arranged on the side where the user rides, that is, on the side of the moving passage connecting the upper floor and the lower floor, and the back of the moving passage, that is, the structure of the building. A truss 24 is provided inside.

  The step 16 is also called a step, and is a moving stage for carrying a user attached to an endless loop-shaped step chain 26. A plurality of steps 16 are connected in an endless manner and circulate between the entrance 12 on the upper floor and the entrance 14 on the lower floor. A groove parallel to the X direction, which is the traveling direction of the step 16, is provided on the upper surface of the step 16 to prevent slipping (see FIG. 2). A more detailed configuration of the step 16 will be described later with reference to FIGS.

  The balustrade 18 is a fixed panel that is provided on both sides of the moving path of the escalator 10, that is, on both sides of the plurality of steps 16, and has a function of holding the moving handrail 20 movably while ensuring the safety of the user. The balustrade 18 is disposed between the entrance 12 on the upper floor and the entrance 14 on the lower floor.

  The moving handrail 20 is a handrail held by a user on the step 16, is slidably held on the upper part of the balustrade 18, and moves in an endless loop in synchronization with the movement of the step 16.

  The skirt guard 22 is provided at the lower part of the balustrade 18 and faces both side surfaces of the step 16, and is disposed so as to extend along the traveling direction of the step 16 with a predetermined gap between both sides of the step 16. It is a protective plate. The skirt guard 22 is disposed so as to extend both above and below the upper surface of the step 16. The steps 16 are arranged stepwise between the upper and lower floors, and the skirt guard 22 is also arranged obliquely between the upper and lower floors according to the arrangement.

  The truss 24 is a part of a building structure in which the moving mechanism of the steps 16, the moving mechanism of the moving handrail 20, and the like are arranged. The truss 24 is composed of an upper floor side horizontal part, a lower floor side horizontal part, and an inclined part that connects between them.

  The drive motor 30 is an electric motor serving as a drive source for the steps 16 and the moving handrail 20. The output shaft 32 is a rotating shaft from which the power of the drive motor 30 is output, and is attached with an output gear having a predetermined number of teeth. The specification of the drive motor 30 can be determined by the total mass of users scheduled by the escalator 10, the rated travel speed of the step 16, and the like. As the drive motor 30, for example, a 200V drive three-phase electric motor or the like can be used.

  The upper sprocket 34 is a drive gear disposed in the upper floor side horizontal portion of the truss 24. The drive chain 36 is an endless chain for power transmission that is stretched between the output shaft 32 of the drive motor 30 and the upper sprocket 34.

  The lower sprocket 38 is a driven gear that is disposed in the horizontal portion on the lower floor side of the truss 24. The step chain 26 is an endless loop-like chain that is stretched between the upper sprocket 34 and the lower sprocket 38. The upper sprocket 34 is formed by laminating two identical drive gears along the axial direction, the drive chain 36 is spanned on one of them, and the step chain 26 is spanned on the other.

  In FIG. 1, with respect to the endless loop-shaped step chain 26, a portion 27 disposed inside the truss 24 and a step-side portion 28 on which a passenger rides are distinguished. Although the part 27 and the part 28 are parts of one endless step chain 26, as shown by the arrow of FIG. The arrows in FIG. 1 indicate the traveling direction of the steps 16 when the passenger is transported from the lower floor to the upper floor. In this case, the portion 28 travels from the lower floor side toward the upper floor side, while the portion 27 travels from the upper floor side toward the lower floor side. When distinguishing the portions 27 and 28, the portion 28 is referred to as an outward portion and the portion 27 is referred to as a return portion.

  Similarly, the plurality of steps 16 include a step portion on which the passenger rides and a step portion disposed on the truss side, and the former is referred to as an outward step and the latter is referred to as a return step. Hereinafter, unless otherwise specified, the step refers to a portion of the forward step.

  The handrail drive sprocket 40 is a drive gear that rotates when a driving force is transmitted from the upper sprocket 34 via the first handrail drive chain 42. The handrail drive sprocket 40 transmits a driving force to the handrail drive device 44 via the second handrail drive chain 46. The handrail driving device 44 is a device that drives the moving handrail 20 to move. In this way, the power of the drive motor 30 is transmitted to the handrail drive device 44 to drive the moving handrail 20 in the same direction as the travel direction of the step 16 at a movement speed synchronized with the movement speed of the step 16.

  Here, when the total mass of the passengers on the plurality of steps 16 of the escalator 10 and the baggage held by the users exceeds the total mass of the users planned for the drive motor 30, the drive motor 30 The drive motor 30 stops due to insufficient capacity, and in some cases, the drive motor 30 rotates in the direction opposite to the drive instruction. The reverse rotation of the drive motor 30 is when the load is greater than the output of the drive motor 30.

  In such a case, normally, it is determined that there is an abnormality by detecting the rotational speed or the like of the drive motor 30, an electrical abnormality signal is output, and power supply to the drive motor 30 is stopped. As a result, the operation of the escalator 10 is stopped, the step 16 is stopped, and the user can evacuate by climbing or descending the stopped step 16. If an electrical abnormality signal is not output for some reason, the following abnormal lowering of the step 16 occurs.

  For example, when the driving instruction is an instruction to drive the step 16 from the lower floor side to the upper floor side, the driving motor 30 rotates in the reverse direction when the load is larger than the output of the driving motor 30. Due to the reverse rotation of the drive motor 30, the upper sprocket 34 rotates reversely via the drive chain 36, and the step chain 26 travels in the reverse direction. As a result, the step 16 starts to descend unexpectedly.

  When the drive instruction is an instruction to drive the step 16 from the upper floor side to the lower floor side, if the load is larger than the output of the drive motor 30, the drive motor 30 rotates in the same direction as the drive instruction, but the rotational speed is Get faster. The faster rotation is transmitted to the upper sprocket 34 via the drive chain 36, and the travel speed of the step chain 26 becomes faster than the command speed. As a result, the step 16 starts an unexpected abnormal descent.

  Further, when the load is abnormally larger than the capacity of the drive motor 30, the drive chain 36 may break. When the drive chain 36 is broken, the drive motor 30 enters an unloaded state and rotates abnormally. In such a case, normally, an abnormality is determined by detecting the rotational speed or the like of the drive motor 30, an electrical abnormality signal is output, power supply to the drive motor 30 is stopped, and the rotation of the upper sprocket 34 is fixed. Is done. Since breakage of the drive chain 36 is considered a serious failure, mechanical safety means are provided in addition to the electrical safety means described above. For example, the breakage of the drive chain 36 is mechanically detected, and a mechanical mechanism using a wedge or the like is operated by the detection to forcibly restrain the rotation of the upper sprocket 34. Due to the double protection of the electrical safety means and the mechanical safety means, the operation of both the drive motor 30 and the upper sprocket 34 is fixed, whereby the operation of the escalator 10 is stopped, and the step 16 is stopped. The user can evacuate by climbing or descending the stopped step 16.

  If neither electrical safety means nor mechanical safety means work for some reason, get on the step 16 regardless of whether the driving instruction is traveling from the lower floor to the upper floor or from the upper floor to the lower floor. Due to the mass of the existing passenger, the step 16 tends to descend in the direction of gravity, and the step 16 descends abnormally.

  In the conventional escalator 10 of the prior art, it is difficult to prevent these steps 16 from descending abnormally.

  Above, description of the structure of the normal escalator 10 is complete | finished. In the escalator with abnormal lowering prevention according to the present embodiment, the abnormal lowering of the step, which is difficult to solve with a normal escalator, is mainly prevented by changing the structure of the step and the tracking rail. The escalator with abnormal lowering prevention uses a step 50 having a configuration different from that of the step 16 described in FIG.

  2 and 3 are diagrams showing the configuration of the step 50. FIG. FIG. 2 is a perspective view. 3 is a detailed view of FIG. 2, FIG. 3 (a) is a top view, (b) is a front view, and (c) is a partially enlarged view of (a).

  The step 50 includes a pair of steps guided by a step plate 52 on which a user rides, a riser 54 corresponding to a raised portion of the step 50, a step shaft 56 connected to the step chain 26, and a pair of drive rails 57 and 58. The driving rollers 59 and 60, a pair of follower rollers 63 and 64 guided by the pair of follower rails 61 and 62, a roller interval holding unit 66, and a circuit unit 68 are configured.

  In FIG. 2, the X direction, Y direction, and Z direction regarding the step 50 were shown. The X direction is the traveling direction of the step 50 and the extending direction of the drive rails 57 and 58. The Y direction is the width direction of the step 50 and is the rolling rotation axis direction when the follower rollers 63 and 64 roll while rotating on the surfaces of the follower rails 61 and 62. The Z direction is a direction perpendicular to the XY plane and a direction perpendicular to the upper surfaces of the follower rails 61 and 62, and a vertical rotation axis direction that rotates when the follower rollers 63 and 64 follow a curved locus of the follower rail described later. It is.

  The step shaft 56 is a shaft member extending in the width direction of the step 50 and is connected to the step chain 26. Each step 50 has a step shaft 56, and each step shaft 56 is connected to an endless loop-shaped step chain 26. As a result, a plurality of steps 50 are connected in an endless loop shape by the step chain 26, and when the step chain 26 is driven by the drive motor 30, each step 50 is also driven to move endlessly. As shown in FIG. 3 (a), the step chain 26 has two flat plates having holes at both ends, which are stacked on both sides of a perforated tube. While aligning with the holes of the perforated cylinder, the positions of the holes on each of the two stacked flat plates are staggered, and this is repeated to form a chain, stepping into one of the holes A shaft 56 is threaded. In FIG. 2, both end portions of the step shaft 56 protruding on both sides across the step 50 are passed through the step chain 26, but in some cases, only one side of both ends of the step shaft 56 is passed through the step chain 26. But you can.

  The pair of drive rollers 59 and 60 are rollers that are guided by the drive rails 57 and 58 and roll while rotating on the upper surfaces of the drive rails 57 and 58. Since the drive rollers 59 and 60 are rotatably attached to both ends of the step shaft 56 connected to the step chain 26, the drive rollers 59 and 60 have a function of driving the step 50 along the drive rails 57 and 58. As shown in FIGS. 1 and 2, when the step 50 travels from the lower floor side to the upper floor side, the drive rollers 59 and 60 correspond to the front wheels of the step 50.

  The pair of follow-up rollers 63 and 64 are rollers that are held by a roller interval holding unit 66 that is attached to the riser 54. When the steps 50 are driven by the drive rollers 59 and 60, they stably run on four wheels. As described above, the roller rolls while following the running of the step 50 and rotating on the upper surfaces of the follower rails 61 and 62. When the step 50 travels, if the driving rollers 59 and 60 are the front wheels of the step 50, the following rollers 63 and 64 correspond to the rear wheels.

FIG. 4 shows an arrangement relationship between a pair of drive rails 57 and 58 through which the pair of drive rollers 59 and 60 are guided and a pair of follow-up rails 61 and 62 through which the pair of follow-up rollers 63 and 64 are guided. FIG. 4 is a diagram showing an XY plane on which a step 50 between the entrance 12 on the upper floor and the entrance 14 on the lower floor travels. The pair of drive rails 57, 58 are parallel to the X direction, and the arrangement interval along the width direction of the drive rails 57, 58 is constant between the entrance 12 on the upper floor and the entrance 14 on the lower floor. One arrangement interval W ₁ .

The pair of follower rails 61 and 62 are provided inside the pair of drive rails 57 and 58 along the width direction. The arrangement interval along the width direction of the following rails 61 and 62 is not constant between the entrance 12 on the upper floor and the entrance 14 on the lower floor, but along the X direction so as to follow the curved locus in the intermediate section 102. Change. In the upper and lower sections 100, 104 of the intermediate section, the arrangement interval in the width direction of the track rails 61 and 62 is constant, a second arrangement interval W _2.

In the intermediate section 102, the arrangement interval along the width direction of the follower rails 61 and 62 becomes the minimum arrangement interval W _{3 as the} arrangement interval is continuously reduced from the second arrangement interval W ₂ at the start position of the intermediate section 102. After that, a curved locus is obtained in which the arrangement interval continuously increases and returns to the second arrangement interval W ₂ at the end position of the intermediate section 102. The shape of the curved locus in the intermediate section 102 is a partial arc shape. Instead of this, a partial elliptical shape may be used, or a shape indicated by a predetermined curved function shape combining these may be used.

  The section length along the X direction of the intermediate section 102 is set to a section length in which at least two or more steps 50 exist in the intermediate section 102. In this way, at least two pairs of follower rollers 63 and 64 can always be present on the upper surface of the follower rails 61 and 62 in the intermediate section 102.

The follower rails 61, 62 guide the rolling of the follower rollers 63, 64 while rotating on the upper surfaces thereof. However, since there is the intermediate section 102 having a curved locus as described above, the follower rollers 63, 64 are removed. Walls are provided on both sides to prevent this. The cross-sectional shape is grooved as shown in FIGS. 2 and 3 (b). The upper surface on which the following rollers 63 and 64 roll is the groove bottom surface. The drive rails 57 and 58 guide the drive rollers 59 and 60. However, since the arrangement interval W ₁ is constant, there is little fear of wheel-out like the follower rollers 63 and 64. Good. In FIG. 2 and FIG. 4B, the cross section is rectangular.

Returning to FIG. 3, a method of supporting the follower rollers 63 and 64 with respect to the step 50 will be described. FIGS. 2 and 3 are diagrams showing the states in the sections 100 and 104 in FIG. 4, and the arrangement interval along the width direction of the tracking rails 61 and 62 is the second arrangement interval W ₂ having a constant value. As described with reference to FIG. 4, the follower rails 61 and 62 have a curved locus in the intermediate section 102. Accordingly, the follower rollers 63 and 64 are supported by the step 50 so that the arrangement interval in the width direction can be varied.

  The interval changing means for changing the arrangement interval of the pair of follower rollers 63 and 64 includes a roller interval holding portion 66, moving elements 71 and 72, roller holders 73 and 74, arms 75 and 76, and a vertical rotation shaft. 77, 78. The interval fixing means for fixing the arrangement interval in a state where the arrangement interval of the pair of follower rollers 63 and 64 is varied includes the pressing plate portions 81 and 82 and the pressing plate driving portion 83 built in the movers 71 and 72. 84 is comprised. The interval fixing means operates under the control of the circuit unit 68 when the rotational speeds of the tracking rollers 63 and 64 exceed a predetermined threshold fluctuation range. The rotational speed sensor 98 is rotational speed detection means for detecting the rotational speed of the follower roller 63 and is attached to the follower roller 63.

  The interval variable means and the interval fixing means are provided in the follower rollers 63 and 64, respectively, but the contents thereof are the same for the follower rollers 63 and 64. Therefore, the contents of the follower roller 63 are described with reference to FIG. State.

  The interval variable means enables the follower roller 63 to move in the width direction so that the follower roller 63 can travel along the curved locus of the follower rail 61, and the follower roller 63 can rotate around an axis parallel to the Z direction. In this state, the upper surface of the tracking rail 61 is rotated while being rotated.

  The roller interval holding part 66 is a guide member that holds the follower roller 63 while being movable in the width direction. The roller spacing holding portion 66 is a grooved bar-like member provided integrally with the riser 54 so as to extend along the width direction on the lower side of the riser 54 of the step 50 and project in the (−X) direction. The roller spacing holding portion 66 is integrated using a fixing means such as a screw with the opening side of the groove facing the lower end surface of the riser 54. By integrating the riser 54 and the roller gap holding portion 66, an internal space 70 is formed along the width direction, and this internal space 70 is a movable space along the width direction of the moving element 71 and the pressing plate portion 81. Become.

  The guide window portion 67 is provided on the end surface in the (−X) direction of the roller interval holding portion 66 and is connected to the internal space 70 through an opening extending in the width direction. The guide window 67 guides the movement of the arm 75 in the width direction through the arm 75 protruding from the moving element 71.

  The mover 71 is a box provided at the base of the arm 75. In addition, a hole through which the vertical rotation shaft 77 passes is provided at the tip of the arm 75. The moving element 71 slides on the wall surface on which the guide window 67 is provided with a contact area larger than the cross-sectional area of the arm 75 so that the mover 71 does not come off the opening of the guide window 67 in order to ensure the movement of the arm 75 in the width direction. Thus, the inside space 70 can be moved in the width direction. In the inner space of the moving element 71, a pressing plate driving unit 83 of the interval fixing means is built in, and details thereof will be described when the interval fixing means is described.

  The roller holder 73 is a follower roller holding member that holds the follower roller 63 so as to be rotatable around the rolling rotation shaft 79. As shown in FIG. 3B, the roller holder 73 is a U-shaped bowl-shaped member that sandwiches the disk-like shape of the follower roller 63, and the follower roller 63 is provided on each of the both side members forming the U shape. A rotation hole for rotatably holding the rolling rotation shaft 79 is provided. By this rotation hole, the follower roller 63 is held by the roller holder 73 so as to be rotatable around the rotation shaft 79, and the follower roller 63 can roll while rotating the upper surface of the follower rail 61. A hole through which the vertical rotation shaft 77 is passed is provided at the top of the bowl-shaped member.

  The vertical rotation shaft 77 is a member that connects the tip of the arm 75 and the roller holder 73. As the vertical rotation shaft 77, a head-attached screw in which one end has a large-diameter head and the other end is threaded can be used. The vertical rotation shaft 77 protrudes while one end side is rotatably held by a rotation hole provided at the top of the roller holder 73 and the other end side is rotatably held through a rotation hole provided at the tip of the arm 75. The nut is inserted into the threaded portion and the length in the vertical direction is determined and stopped.

  The roller holder 73 is held by the arm 75 so as to be rotatable around an axis parallel to the Z direction by the vertical rotation shaft 77. Thereby, the follow-up roller 63 can be rotated around an axis parallel to the Z direction. That is, the follower roller 63 can rotate around an axis perpendicular to the upper surface of the follower rail 61 in accordance with the guidance of the follower rail 61. Further, since the follower roller 63 is connected to the arm 75 and the moving element 71 via the roller holder 73 by the vertical rotation shaft 77, the follower roller 63 can move in the width direction. Since the other follower roller 64 is the same, the arrangement interval between the pair of follower rollers 63 and 64 can be varied in accordance with the arrangement interval between the pair of follower rails 61 and 62.

  The interval fixing unit fixes the arrangement interval of the pair of follower rollers 63 and 64 in a state where the arrangement interval is varied by the interval varying unit. Since the contents of the interval fixing means are the same for the follower rollers 63 and 64, here, the follower roller 63 will be described as being fixed in a state of moving in the width direction.

  The interval fixing means includes a pressing plate portion 81 and a pressing plate driving portion 83 built in the moving element 71. The interval fixing means moves in the X direction of the inner space 70 of the roller interval holding portion 66 without the ΔS sliding gap provided between the both side wall surfaces of the inner space 70 and the outer shape of the box of the moving element 71. Prevent the child 71 from moving.

  The pressing plate portion 81 has a pressing surface portion having an appropriate pressing area facing the pressing wall portion, which is the inner wall surface opposite to the inner wall surface where the guide window portion 67 of the internal space 70 is provided, and a moving element extending from the pressing surface portion. And an arm portion connected to a tension spring 89 provided in the internal space of 71. The tip shape of the arm portion is a tapered shape. In order to pass the arm portion, the moving element 71 is provided with an opening.

  The pressing plate driving unit 83 includes a plunger movable body 85 and a plunger coil 87 in addition to the tension spring 89. The plunger movable body 85 is made of a material that is pulled toward the plunger coil 87 when the plunger coil 87 is energized. For example, the plunger movable body 85 can be made of a soft magnetic material. The shape of the tip of the plunger movable body 85 is a tapered shape.

  When the plunger coil 87 is not energized, the plunger movable body 85 takes a position in the (−Y) direction from the plunger coil 87 by a biasing means (not shown). At this time, the tapered distal end portion of the plunger movable body 85 comes into contact with the tapered distal end portion of the arm portion of the pressing plate portion 81, and the pressing plate portion 81 moves to the (−X) side against the tensile force of the tension spring 89. Let As a result, the pressing plate 81 takes a retracted position sufficiently away from the pressing wall. In this state, the movable element 71 can secure a sliding gap of ΔS between the inner wall 70 of the inner space 70 and can move in the width direction.

  When the plunger coil 87 is energized, the plunger movable body 85 is drawn to the plunger coil 87 side, and the contact state between the tapered distal end portion of the plunger movable body 85 and the tapered distal end portion of the arm portion of the pressing plate portion 81 is released. . As a result, the pressing plate 81 is moved to the (+ X) side by the tensile force of the tension spring 89. By this movement, the pressing plate portion 81 abuts against the pressing wall portion and is pressed against the pressing wall portion with a pressing force obtained by multiplying the tensile force of the tension spring 89 by the pressing area. This state is indicated by a solid line in FIG. The broken line indicates a state before the plunger movable body 85 is retracted.

  As a result, the slider 71 and the pressing plate portion 81 are stretched between the opposing inner wall surfaces of the internal space 70, the ΔS sliding gap is eliminated, the position of the slider 71 is fixed, and the slider 71 is moved in the width direction. The follower roller 63 is also fixed and cannot move in the width direction. The follower roller 63 is fixed in a state of being moved in the width direction by the interval varying means. Thus, the interval fixing means is a restraining means for restraining the moving element 71 from moving.

  In the above, the interval fixing means is constituted by the plunger movable body 85, the plunger coil 87, and the tension spring 89, but any other arrangement may be used as long as it is a means for eliminating the sliding gap of ΔS. For example, the structure which incorporates a pressing board part directly in a plunger mechanism may be sufficient.

  The interval fixing means operates under the control of the circuit unit 68 when the rotation speed, which is the rotation speed per unit time of the follow-up rollers 63 and 64, exceeds a predetermined threshold fluctuation range. The rotational speed sensor 98 is rotational speed detection means for detecting (rotational speed = rotational speed / min) of the tracking roller 63 and is attached to the tracking roller 63. The threshold fluctuation range is set to a value at which the step 50 is recognized to have abnormally lowered. Although the threshold fluctuation range is set with respect to the set rotational speed of the follower roller 63, it is easier to understand that the abnormal lowering of the step 50 is performed at the abnormal traveling speed than the abnormal rotational speed in order to evaluate the abnormal lowering of the step 50. Therefore, in the following description, the rotational speed is replaced with the traveling speed. In this case, the threshold fluctuation range is set with respect to the set traveling speed of the tracking roller 63.

  FIG. 5 is a diagram illustrating setting of the threshold fluctuation range. In these figures, the horizontal axis represents time, and the vertical axis represents the traveling speed of the follower roller 63. The sign of the traveling speed is a plus (+) for the traveling speed when the step 50 travels from the lower floor to the upper floor, and a traveling speed for the lower floor traveling from the upper floor to the lower floor (- ). FIG. 5A is a diagram showing a traveling speed line 110 of the follower roller 63 when an abnormal drop occurs in which the escalator 10 descends in the reverse direction while transporting a user from the lower floor to the upper floor, (B) is a figure which shows the traveling speed line 112 when the abnormal fall which the descent | fall speed becomes high occurs while the escalator 10 is transporting a user from an upper floor toward a lower floor.

In FIG. 5 (a), until the front of the time t _1, at approximately the speed line 110 of the follower roller 63 constant, to set the running speed (+ V _U0), fall in the range of ± [Delta] V _U is the control range, This indicates that the vehicle is in a stable climbing state. As an example, (+ V _U0 ) = + 30 m / min, ± ΔV _U = ± 5% × (+ V _U0 ) = ± 1.5 m / min. If the threshold fluctuation range ΔV ₀ is set to 5% of (+ V _U0 ), it is indistinguishable from the lower limit of the normal climbing traveling state. Therefore, ΔV ₀ is preferably set to about 10% of (+ V _U0 ).

In the above numerical example, ΔV ₀ = (− 10%) × (+ V _U0 ) = − 3.5 m / min. Since ΔV ₀ is provided on the descending side, the traveling speed of the tracking roller 63 when the traveling speed of the tracking roller 63 exceeds the threshold fluctuation range ΔV ₀ and is determined to be abnormally lowered is {+ V _U0 −ΔV ₀ } = { (+35 m / min)-(3.5 m / min)} = + 31.5 m / min. FIGS. 5 (a) travel speed line 110 begins to decrease the running speed from the previous time t _1, at time t _1, it becomes a low speed exceeding the threshold variation width [Delta] V _0, nothing struck measures as Otherwise, it will descend in the opposite direction.

When the traveling speed of the follow-up roller 63 becomes a low speed exceeding the threshold fluctuation range at time t ₁ , the rotational speed sensor 98 outputs an abnormal drop detection signal. The outputted abnormal lowering detection signal is transmitted to the circuit unit 68 through an appropriate signal line. When the circuit unit 68 receives the abnormal lowering detection signal, the circuit unit 68 energizes the plunger coil 87 constituting the interval fixing means. As a result, the pressing plate 81 is pressed against the pressing wall, the mover 71 is restrained from moving, and the follower roller 63 is also fixed in that state.

The same applies to the case of descending traveling in FIG. In FIG. 5 (b), to just before the time t _2, at approximately the speed line 112 of the follower roller 63 constant, to set the running speed (-V _D0), fall in the range of ± [Delta] V _D is the control width This indicates that the vehicle is in a stable climbing state. As an example, (−V _D0 ) = − 30 m / min, ± ΔV _D = ± 5% × (−V _D0 ) = ± 1.5 m / min. If the threshold fluctuation range ΔV ₀ is set to 5% of (−V _D0 ), it is indistinguishable from the lower limit of the normal climbing state, so ΔV ₀ can be set to about 10% of (−V _D0 ). preferable.

In the above numerical example, ΔV ₀ = (10%) × (−V _D0 ) = − 3.5 m / min. Since ΔV ₀ is provided on the descending side, the traveling speed of the follower roller 63 when the traveling speed of the follower roller 63 exceeds the threshold fluctuation range ΔV ₀ and is determined to be abnormally lowered is {−V _D0 −ΔV ₀ } = This is a time when the speed is increased to the (−) side of {(−35 m / min) − (3.5 m / min)} − 38.5 m / min. Speed line 112 in FIG. 5 (b), begins to decrease the running speed from the previous time t _2, at time t _2, the lowering speed exceeds a threshold value fluctuation width [Delta] V _0.

At time t ₂ , when the traveling speed of the follower roller 63 reaches a lowering speed exceeding the threshold fluctuation range ΔV ₀ , the rotational speed sensor 98 outputs an abnormal lowering detection signal. The outputted abnormal lowering detection signal is transmitted to the circuit unit 68 through an appropriate signal line. When the circuit unit 68 receives the abnormal lowering detection signal, the circuit unit 68 energizes the plunger coil 87 constituting the interval fixing means. As a result, the pressing plate 81 is pressed against the pressing wall, the mover 71 is restrained from moving, and the follower roller 63 is also fixed in that state.

  The above numerical values are examples for explanation, and other numerical values may be used.

  The operation of the above configuration will be described in detail with reference to FIG. FIG. 6 shows the curved trajectory of the intermediate section 102 of the follower rails 61 and 62. When the follower rollers 63 and 64 follow the follower rails 61 and 62 and run up ascending, an abnormal descending state occurs and the interval is fixed. It is a figure which shows that a means operates and driving | running | working of the following rollers 63 and 64 is fixed. In FIG. 6, there are six steps 50a, 50b, 50c, 50d, 50e, and 50f in the intermediate section 102 and the sections 100 and 104 above and below it. As for the two steps 50b and 50f, a part of the step 50, the roller interval holding portion 66, and the pressing plate portions 81 and 82 are also shown, but in the other steps, these illustrations are omitted, and the follower rollers 63, 64, The movers 71 and 72, the arms 75 and 76, the vertical rotation shafts 77 and 78, and the rolling rotation shafts 79 and 80 are extracted and shown.

  When traveling upstairs, in FIG. 6, the step 50 a is not yet engaged with the intermediate section 102, so that the movers 71 and 72 do not move in the width direction, rotate around the vertical rotation shafts 77 and 78, and rotate. The follower rollers 63 and 64 rotate around the shafts 79 and 80 and roll on the upper surfaces of the follower rails 61 and 62. Since the step 50b is in the intermediate section 102, the movers 71 and 72 move along the width direction as indicated by arrows in FIG. 6, and the follow-up rollers 63 and 64 rotate around the vertical rotation shafts 77 and 78. Following the tracking rails 61 and 62 of the curved locus, the tracking rollers 63 and 64 rotate around the rolling rotary shafts 79 and 80 in this state to roll on the upper surfaces of the tracking rails 61 and 62. The same applies to the other steps 50.

  As described above, during the ascending traveling, the follower rollers 63 and 64 follow the curved locus of the follower rails 61 and 62 by the movement of the movers 71 and 72 in the width direction and the rotation around the vertical rotation shafts 77 and 78. In this state, the follower rollers 63 and 64 rotate around the rolling rotary shafts 79 and 80 to roll on the upper surfaces of the follower rails 61 and 62.

  Next, when an abnormal lowering detection signal is output, the pressing plate portions 81 and 82 of all the steps 50a, 50b, 50c, 50d, 50e, and 50f move in the (+ X) direction, and the roller interval holding portion 66 is pressed. The movement of the sliders 71 and 72 of all the steps 50a, 50b, 50c, 50d, 50e, and 50f is restricted, and the rotation of the follower rollers 63 and 64 around the vertical rotation axes 77 and 78 is stopped. The rollers 63 and 64 remain inclined with respect to the X direction.

  As a result, even if the steps 50a, 50b, 50c, 50d, 50e, and 50f are abnormally lowered and the follower rollers 63 and 64 move in the (−X) direction obliquely with respect to the X direction, they are immediately curved. It hits the side walls of the tracking rails 61 and 62 of the locus and cannot descend further. In FIG. 6, it is indicated by an alternate long and short dash line that the follower rollers 63 and 64 hit the side walls of the follower rails 61 and 62 in an attempt to descend abnormally with respect to the steps 50b and 50d.

  As described above, when the abnormal lowering signal is output, the movements of the movers 71 and 72, the arms 75 and 76, and the following rollers 63 and 64 are restrained by the movement of the pressing plate portions 81 and 82 in the (+ X) direction, Even if further lowering is attempted, the follower rollers 63 and 64 hit the side walls of the follower rails 61 and 62, and no further abnormal lowering occurs. That is, according to the said structure, when a step tends to descend | fall abnormally, the fall can be prevented.

  10 Escalator, 12 (Upper floor) boarding gate, 14 (Lower floor) boarding gate, 16, 50, 50a, 50b, 50c, 50d, 50e, 50f Step, 18 balustrade, 20 Moving handrail, 22 Skirt guard, 24 Truss, 26 Step chain, 27, 28 part, 30 Drive motor, 32 Output shaft, 34 Upper sprocket, 36 Drive chain, 38 Lower sprocket, 40 Handrail drive sprocket, 42, 46 Handrail drive chain, 44 Handrail drive device, 52 Step plate , 54 Riser, 56 Step shaft, 57, 58 Drive rail, 59, 60 Drive roller, 61, 62 Follow rail, 63, 64 Follow roller, 66 Roller interval holding part, 67 Guide window part, 68 Circuit part, 70 Internal space 71, 72 Mover, 73, 74 Roller holder, 75, 76 77, 78 Vertical rotation axis, 79, 80 Rolling rotation axis, 81, 82 Pressing plate part, 83, 84 Pressing plate drive part, 85 Plunger movable body, 87 Plunger coil, 89 Tension spring, 98 Rotational speed sensor, 100, 104 (upper and lower of the middle section) section, 102 middle section, 110, 112 travel speed line.

Claims (6)

Multiple steps,
Each step shaft extending in the width direction of each step is connected in an endless loop shape, and a step chain provided between the upper and lower floors of the building,
A pair of drive rollers arranged at a first arrangement interval along the step axis for each step;
For each step, a pair of follower rollers provided inside the pair of drive rollers along the width direction and having a variable arrangement interval;
A pair of drive rails provided between the upper floor and the lower floor of the building at a first arrangement interval for guiding the rotation of the pair of drive rollers of each step;
A pair of follower rails provided between the upper and lower floors of the building to guide the rotation of the pair of follower rollers of each step, and above and below the middle section between the upper and lower floors of the building Are arranged at the second arrangement interval, and after the arrangement interval is continuously reduced from the second arrangement interval of the start position in the intermediate section to become the minimum arrangement interval, the arrangement interval is continuously increased and the end position of the intermediate section is reached. A pair of following rails that return to the second arrangement interval at
Interval fixing means for fixing the arrangement interval of the follower rollers based on an abnormal lowering detection signal for detecting that the speed of the driving roller or follower roller on the step side on which the user rides exceeds a predetermined threshold fluctuation range on the descending side; ,
With
An escalator with an abnormal lowering prevention device, wherein the pair of follower rollers is rotatable around an axis perpendicular to the upper surface of the follower rail according to the guide of the follower rail. In the escalator with an abnormal descent prevention device according to claim 1,
An escalator with an abnormal lowering prevention device, wherein the intermediate section has a section length in which at least two or more steps are always present. In the escalator with an abnormal descent prevention device according to claim 1,
The interval varying means for varying the arrangement interval of the pair of follower rollers is:
For each follower roller,
A mover capable of moving in the width direction within a roller interval holding portion provided along the width direction of the step;
An arm that is integrated with the mover and protrudes from the roller interval holding portion;
A roller holder for rotatably holding the rolling rotation shaft of the follower roller;
A vertical rotation shaft provided at the tip of the arm and rotatably holding the roller holder around an axis perpendicular to the upper surface of the tracking rail;
An escalator with an abnormal lowering prevention device characterized by comprising: In the escalator with an abnormal descent prevention device according to claim 3,
The interval fixing means is
An escalator with an abnormal lowering prevention device, characterized by comprising movement restraining means for restraining movement of a moving element of the interval varying means when an abnormal lowering detection signal is output. In the escalator with an abnormal descent prevention device according to claim 1,
The escalator with an abnormal lowering prevention device, wherein the shape of the intermediate section is any one of a partial arc shape, a partial ellipse shape, or a shape indicated by a predetermined curved function shape. In the escalator with an abnormal descent prevention device according to claim 1,
A rotation speed detecting means for detecting the rotation speed of the follower roller;
An escalator with an abnormal descent prevention device, wherein an abnormality detection signal is output based on a detection value of a rotation speed detection means.

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