Abnormality detection device for passenger conveyor

Abstract

The present invention provides an abnormality detection device for a passenger conveyor that can be easily installed in the passenger conveyor. The abnormality detection device detects abnormalities in the passenger conveyor, the passenger conveyor comprising: a step section having a plurality of steps connected in a ring shape and traveling along a ring path including a conveying section for conveying passengers; a left roller on one end side and a right roller on one end side, each of which is disposed at a predetermined distance from the left and right sides of the step section traveling in a normal position at one end side of the conveying section; and a left roller on the other end side and a right roller on the other end side, each of which is disposed at a predetermined distance from the left and right sides of the step section traveling in a normal position at the other end side of the conveying section. The abnormality detection device comprises: a rotation detection unit that detects the rotation state of each of the four side rollers; and an abnormality detection unit that detects abnormalities in the passenger conveyor based on the rotation state detected by the rotation detection unit.

Description

Technical Field

[0001] The present disclosure relates to an abnormality detection device that detects abnormality of a passenger conveyor. Background Art

[0002] Passenger conveyors have a step section with multiple steps connected in a ring shape, which moves along a looped path encompassing the conveying area for transporting passengers. The step section is guided by guide members located on the left and right sides and is pulled by step chains connected to the left and right sides of each step. However, if the guide members wear or the step chains stretch over time, for example, the step section's travel position may shift to the left or right, or become tilted relative to its original direction of travel. This can further deteriorate and damage related components, potentially leading to failure.

[0003] In contrast, Patent Document 1 discloses the following technology: in each of the upper side horizontal portion and the lower side horizontal portion of a passenger conveyor, distance sensors are arranged at positions on the left and right sides of the step portion and separated from each other in the direction of travel of the step portion, and abnormalities of the passenger conveyor are detected based on the results of measurements of the distance to the step portion by these distance sensors.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2019 / 016884 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] However, the method of Patent Document 1 requires high-precision position adjustment processing in consideration of the distance to the step when installing each distance sensor, which causes a problem of requiring a lot of time and effort.

[0009] Therefore, an object of the present disclosure is to provide an abnormality detection device for a passenger conveyor that can be easily installed in the passenger conveyor.

[0010] Means for solving problems

[0011] The abnormality detection device of the passenger conveyor disclosed herein detects abnormalities in the passenger conveyor, which includes: a step section, a plurality of steps of which are connected in a ring shape and travel along a ring path including a conveying section for conveying passengers; a left roller on one end side and a right roller on one end side, which are respectively arranged at positions on one end side of the conveying section, away from left and right sides of the step section traveling in a normal position, a predetermined distance away, and rotate as the step section travels when in contact with the step section; and a left roller on the other end side and a right roller on the other end side, which are respectively arranged at positions on the other end side of the conveying section, away from left and right sides of the step section traveling in a normal position, and rotate as the step section travels when in contact with the step section, the abnormality detection device includes: a rotation detection unit, which detects the rotation state of each of the left roller on one end side, the right roller on one end side, the left roller on the other end side, and the right roller on the other end side; and an abnormality detection unit, which detects abnormalities of the passenger conveyor based on the rotation state detected by the rotation detection unit.

[0012] Effects of the Invention

[0013] According to the abnormality detection device for a passenger conveyor of the present disclosure, it is possible to detect abnormality of the passenger conveyor by virtue of a configuration that can be easily installed in the passenger conveyor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram showing a schematic configuration of an escalator to which the abnormality detection device according to the first embodiment is applied.

[0015] Figure 2 This is an enlarged view of the key part of the upper end of the conveying section as seen from the side.

[0016] Figure 3 This is an enlarged view of the key portion of the upper end portion of the conveying section as viewed from above.

[0017] Figure 4 This is a diagram showing a schematic configuration of the abnormality detection device according to the first embodiment.

[0018] Figure 5 It is a diagram showing an example of changes in the travel position of the step portion.

[0019] Figure 6 This is a diagram showing another example of changes in the travel position of the step portion.

[0020] Figure 7 This is a hardware configuration diagram of the abnormality detection device according to the first embodiment.

[0021] Label Description

[0022] 1: escalator;

[0023] 6: steps;

[0024] 9: side roller;

[0025] 11: step chain;

[0026] 13: truss;

[0027] 15: Electric motor;

[0028] 18: driving wheel;

[0029] 19: driven wheel;

[0030] 22: Skirt board;

[0031] 27: Moving armrests;

[0032] 40: control panel;

[0033] 51: processor;

[0034] 52: memory;

[0035] 53: signal input and output unit;

[0036] 60: Steps;

[0037] 6a: tread;

[0038] 6b: vertical board;

[0039] 6c: side parts;

[0040] 6d: driving roller;

[0041] 6e: driven roller;

[0042] 6g: step shaft;

[0043] 90: rotation detection unit;

[0044] 91: base;

[0045] 92: detection piece;

[0046] 93: opening;

[0047] 96: supporting member;

[0048] 97: rotation detection sensor;

[0049] 99: connecting parts;

[0050] 100: anomaly detection device;

[0051] 101: Abnormal detection unit;

[0052] 102: Control Department;

[0053] 103: storage unit;

[0054] 107: comb teeth;

[0055] 110: Notification Department;

[0056] 12d: driving track;

[0057] 12e: driven track;

[0058] 14A: Upper machine room;

[0059] 14B: Lower machine room;

[0060] 17A: Upper side boarding and landing board;

[0061] 17B: Lower level boarding and landing platform. DETAILED DESCRIPTION

[0062] [First embodiment]

[0063] Hereinafter, a first embodiment will be described. Figure 1 1 is a diagram showing a schematic structure of an escalator 1 to which the abnormality detection device 100 according to the first embodiment is applied. Figure 1 As shown, the escalator 1 has a truss 13 erected between upper and lower adjacent floors of a building, and an upper machine room 14A and a lower machine room 14B respectively provided on the upper and lower sides of the truss 13. The upper machine room 14A is provided with a motor 15 as a driving unit, a driving wheel 18 rotated by the motor 15, and a control panel 40 for controlling the operation of the escalator 1. The lower machine room 14B is provided with a driven wheel 19 driven by the rotation of the driving wheel 18. The step chain 11 is wound around the driving wheel 18 and the driven wheel 19 in an annular shape. In addition, Figure 1 One side surface of the escalator 1 is shown. The other side surface is similar. Two driving wheels 18, two driven wheels 19, and two step chains 11 are arranged in pairs on the left and right sides with a plurality of steps 6 interposed therebetween.

[0064] Furthermore, an upper deck 17A is provided above the upper machine room 14A, through which passengers board and disembark the steps 6. A lower deck 17B is provided above the lower machine room 14B, through which passengers board and disembark the steps 6. The escalator 1 is used to transport passengers in the section between the upper deck 17A and the lower deck 17B. In the following description, this section is referred to as the transport section.

[0065] The escalator 1 includes a step section 60, wherein a plurality of steps 6 are connected to a step chain 11 to form a loop, and the escalator 1 travels along a loop path including a conveyor section for transporting passengers. Furthermore, within the conveyor section, the escalator 1 includes skirt guards 22 provided along both sides of the step section 60 and a moving handrail 27 that moves synchronously with the step section 60.

[0066] Figure 2 This is an enlarged view of the key part of the upper side end A of the conveying section viewed from the side. Figure 3 This is an enlarged view of the key part of the upper side end A of the conveying section viewed from above. Figure 2 and Figure 3 As shown, each step 6 includes a tread 6a for passengers to ride on, a riser 6b (the kick plate portion of the step 6), a pair of side members 6c forming left and right side surfaces, and a step shaft 6g with both ends rotatably supported by the pair of side members 6c. Furthermore, each step 6 includes a pair of drive rollers 6d attached to both ends of the step shaft 6g and a pair of driven rollers 6e attached to the riser 6b side of the step 6. The drive rollers 6d run on a drive rail 12d located within the truss 13, while the driven rollers 6e run on a driven rail 12e located within the truss 13.

[0067] The upper deck 17A has a comb-tooth portion 107 at its end facing the step 6. The comb-tooth portion 107 has multiple comb-tooth pieces that engage with grooves on the surface of the step 6. When the escalator 1 is ascending, the step 6 that reaches the comb-tooth portion 107 passes under the upper deck 17A and enters the interior of the truss 13. When the escalator 1 is descending, the step 6 passes under the upper deck 17A and exits the truss 13.

[0068] Furthermore, a plurality of side rollers 9 are provided on the left and right sides of the step portion 60 to restrict the position of the step portion 60 in the left-right direction. Figure 2 and Figure 3 , an example is shown in which two side rollers 9, a total of four side rollers, are arranged on the left and right sides of the step portion 60 at the upper side end A of the conveying section. Each side roller 9 is arranged at a position separated by a predetermined distance from the left and right side surfaces of the step portion 60 traveling in the normal position, and is configured to be able to rotate at this position. Here, the normal position of the step portion 60 refers to a position in which the groove of the step 6 passes through the approximately center between the comb teeth of the comb portion 107. When the traveling position of the step portion 60 is offset to the left or right due to wear of the guide components (drive rail 12d, driven rail 12e, etc.), stretching of the step chain 11, etc., and when any side roller 9 is in contact with the step portion 60, the side roller 9 rotates due to the friction force with the step portion 60.

[0069] The side rollers 9 are provided on the left and right sides of the step portion 60 at the upper side end portion of the conveying section, at position C just before the step portion 60 reaches the comb-tooth portion 107, and at position D after the step portion 60 reaches the comb-tooth portion 107. These side rollers 9 are connected by a connecting member 99. In addition, a rotation detection unit 90 for detecting the rotation state of each side roller 9 provided at position C is provided. The rotation detection unit 90 is composed of a base 91, a detection piece 92, a support member 96, and a rotation detection sensor 97. In addition, each side roller 9 provided at position C is equivalent to a side roller arranged on the inner side of the conveying section than the one end side boarding board (or the other end side boarding board) of the present disclosure.

[0070] On the upper surface of each side roller 9 set at position C, a circular plate-shaped detection piece 92 is installed with the help of a base 91. The detection piece 92 rotates integrally with the side roller 9. The detection piece 92 is made of a metal material and has a plurality of openings 93 arranged at equal intervals in the circumferential direction. In addition, a rotation detection sensor 97 that detects the rotation state of the detection piece 92 in a non-contact manner is provided at a position opposite to the surface of the detection piece 92 where the opening 93 is formed. The rotation detection sensor 97 detects whether the side roller 9 is in a rotating state and outputs its detection result. As the rotation detection sensor 97, a proximity sensor is used that detects the rotation state of the detection piece 92 by detecting the magnetic loss caused by the eddy current generated on the conductor surface of the detection piece 92 due to the influence of the external magnetic field. The rotation detection sensor 97 is mounted on the connecting component 99 with the help of the support component 96.

[0071] The lower end portion B of the conveying section has a structure substantially the same as that of the upper end portion A described above, except that it faces in the opposite direction. Also at the lower end portion B of the conveying section, two side rollers 9 are arranged on each side of the step portion 60, for a total of four side rollers 9. Furthermore, a rotation detection unit 90 is provided on each of the left and right pairs of side rollers 9 positioned just before the step portion 60 reaches the comb-teeth portion 107 when the escalator 1 is descending (a position where the step portion 60 has passed the comb-teeth portion 107 when the escalator 1 is ascending).

[0072] For ease of explanation, the left and right side rollers 9 provided with the rotation detection unit 90 among the four side rollers 9 located at the upper end portion A are sometimes referred to as the upper left roller ULr and the upper right roller URr, and the left and right side rollers 9 provided with the rotation detection unit 90 among the four side rollers 9 located at the lower end portion B are sometimes referred to as the lower left roller DLr and the lower right roller DRr. Furthermore, the rotation detection sensor 97 provided on the upper left roller ULr is sometimes referred to as the upper left rotation detection sensor ULs, and the rotation detection sensor 97 provided on the upper right roller URr is sometimes referred to as the upper right rotation detection sensor URs. The rotation detection sensor 97 provided on the lower left roller DLr is sometimes referred to as the lower left rotation detection sensor DLs, and the rotation detection sensor 97 provided on the lower right roller DRr is sometimes referred to as the lower right rotation detection sensor DRs.

[0073] Figure 4 1 is a diagram showing a schematic structure of the abnormality detection device 100. Figure 4 As shown, the abnormality detection device 100 includes a rotation detection unit 90 comprising an upper-level left rotation detection sensor ULs, an upper-level right rotation detection sensor URs, a lower-level left rotation detection sensor DLs, and a lower-level right rotation detection sensor DRs; an abnormality detection unit 101 that detects abnormalities in the escalator 1 based on the rotational states of the corresponding side rollers 9 detected by these detection sensors. Furthermore, the abnormality detection device 100 includes a control unit 102 that, when the abnormality detection unit 101 detects an abnormality, performs at least one of outputting a signal notifying the abnormality to a notification unit 110 or outputting a signal to the control panel 40 of the escalator 1 to stop the operation of the escalator 1; and a storage unit 103 that stores various data. The notification unit 110 may be a speaker or the like that notifies users of the escalator 1 of abnormalities, or a communication device that outputs the abnormality notification signal to an information terminal of an administrator managing the escalator 1 via wired or wireless communication.

[0074] The upper side left rotation detection sensor ULs, the upper side right rotation detection sensor URs, the lower side left rotation detection sensor DLs and the lower side right rotation detection sensor DRs detect the rotation status of each corresponding side roller 9 regularly or at any time, and output the detection results to the abnormality detection unit 101.

[0075] The abnormality detection unit 101 periodically or occasionally obtains information on the rotational status of the corresponding side rollers 9, i.e., whether they are rotating, from the upper left rotation detection sensor ULs, upper right rotation detection sensor URs, lower left rotation detection sensor DLs, and lower right rotation detection sensor DRs. Based on this information, the abnormality detection unit 101 detects abnormalities in the escalator 1. For example, if any two of the four rotation detection sensors detect that the side rollers are rotating, the abnormality detection unit 101 determines that an abnormality has occurred and outputs a signal indicating the abnormality. Alternatively, the abnormality detection unit 101 may determine an abnormality only if two rotation detection sensors have detected that the side rollers are rotating a predetermined number of times or more.

[0076] Figure 5 : is a diagram showing an example of a change in the travel position of the step portion 60. Figure 5 (a) shows a state where the step portion 60 is in a normal position and is not in contact with any side roller. Figure 5 (b) shows that the step portion 60 is greatly offset to the left, and contacts the upper left roller ULr and the lower left roller DLr, thereby rotating these side rollers. Figure 5 In the state shown in (b), the two rotation detection sensors, the upper side left rotation detection sensor ULs and the lower side left rotation detection sensor DLs, obtain detection results that the corresponding side rollers are in a rotating state, so the abnormality detection unit 101 determines it as an abnormality based on this.

[0077] Figure 6 is a diagram showing another example of the change in the travel position of the step portion 60. Figure 6 (a) shows a state where the step portion 60 is in a normal position and is not in contact with any side roller. Figure 6 (b) shows that the step portion 60 is in a state where the travel position is greatly tilted and contacts the upper left roller ULr and the lower right roller DRr, thereby rotating these side rollers. Figure 6 In the state shown in (b), the two rotation detection sensors, the left rotation detection sensor ULs on the upper side and the right rotation detection sensor DRs on the lower side, obtain detection results that the corresponding side rollers are in a rotating state, so the abnormality detection unit 101 determines it as an abnormality based on this.

[0078] The above-described abnormality detection device 100, except for the rotation detection unit 90, is composed of a Figure 7The computer shown in FIG. 1 is composed of a processor 51, a memory 52, and a signal input / output unit 53. The functions of the abnormality detection unit 101 and the control unit 102 are implemented by this computer. Specifically, the computer's memory 52 stores a program (an abnormality detection program) for implementing the functions of the abnormality detection unit 101 and the control unit 102. Furthermore, the various information stored in the storage unit 103 is also stored in the memory 52. ​​The processor 51 executes computational processing to control the operation of the abnormality detection device 100 according to the program stored in the memory 52.

[0079] As described above, in the abnormality detection device 100 of the first embodiment, in the escalator 1 having side rollers on the left and right sides of each step portion at the upper end A and the lower end B of the conveying section, the rotation detection unit 90 detects the rotation state of each of the four side rollers (upper left roller ULr, upper right roller URr, lower left roller DLr, and lower right roller DRr), and the abnormality detection unit 101 detects an abnormality of the escalator 1 based on the rotation state detected by the rotation detection unit 90. Thus, an abnormality of the escalator 1 can be detected using a structure that can be easily installed in the escalator 1.

[0080] Furthermore, in the conventional method described in Patent Document 1, which involves configuring distance sensors on the left and right sides of a step portion and using them to detect anomalies, the installation of the distance sensors requires high-precision position adjustment processing that takes into account the distance from the step, which results in a significant amount of time and effort. In contrast, in the first embodiment, the anomaly detection device 100 can be installed on the side rollers that are typically positioned after position adjustment in the escalator 1 by simply installing a rotation detection sensor that detects their rotational state, eliminating the need for high-precision position adjustment processing that takes into account the distance from the step. This makes it easy to install a structure for detecting anomalies in the escalator 1 on the escalator 1.

[0081] [Second embodiment]

[0082] The second embodiment will be described below. The second embodiment differs from the first embodiment in that the abnormality detection unit 101 determines the degree of abnormality (also referred to as the abnormality level) of the escalator 1 based on the rotation state detected by the rotation detection unit 90, and the control unit 102 executes processing corresponding to the abnormality level determined by the abnormality detection unit 101. The following description focuses on these differences, and descriptions of the same structures as the first embodiment are omitted.

[0083] The abnormality detection unit 101 continuously obtains detection results of the rotational state of each corresponding side roller 9, which are repeatedly detected by each rotation detection sensor 97 of the rotation detection unit 90, while the step portion 60 travels a predetermined length of at least half a revolution in the looped path. Examples of the predetermined length of at least half a revolution include half a revolution, 2 / 3 of a revolution, 3 / 4 of a revolution, 1 revolution, 3 revolutions, and the like. Based on the multiple detection results obtained by each rotation detection sensor 97, the abnormality detection unit 101 then determines, for each side roller 9, the ratio of the section in which the side roller 9 is in contact with the step portion 60 to the total section of the step portion 60 having a predetermined length of at least half a revolution.

[0084] For example, while the step portion 60 travels three times in a loop, the abnormality detection unit 101 repeatedly detects the rotational state of the side roller 9 corresponding to each rotation detection sensor 97 at predetermined time intervals and continuously obtains the detection results. Based on this obtained information, the abnormality detection unit 101 then calculates, for each side roller 9, the ratio P of the period in which the side roller 9 is in contact with the step portion 60 relative to the entire period (one full rotation) of the step portion 60. Specifically, the ratio P is calculated as the ratio of the number of times the rotation detection sensor 97 detects the rotational state of the side roller 9 and the number of times the side roller 9 is detected as being in a rotating state. For example, if the rotation detection sensor 97 detects the rotational state of the side roller 9 100 times and the side roller 9 is detected as being in a rotating state 40 of those times, the ratio P is set to 40%.

[0085] The abnormality detection unit 101 determines the abnormality level according to predetermined determination conditions shown in the following Table 1, for example. In this case, the determination conditions in Table 1 are predetermined and stored in the storage unit 103 .

[0086]

Table 1

[0087]

[0088] For example, when the step section 60 is moving approximately straight in its normal position, the step section 60 does not contact any of the side rollers 9, and the ratio P for all rotation detection sensors 97 is 0%. In this case, the abnormality detection unit 101 does not meet any of the determination conditions shown in Table 1 and therefore determines that there is no abnormality. Subsequently, if the step section 60's moving position gradually shifts to the left over time, the number of times the step section 60 contacts the upper left roller ULr or the lower left roller DLr gradually increases, and the ratio P for the rotation detection sensor 97 located on either side roller reaches 50%. In this case, the abnormality detection unit 101 determines that there is no abnormality until the ratio P reaches 50% for one rotation detection sensor 97. When it reaches 50%, the abnormality level is determined to be 1.

[0089] Thereafter, if the travel position of the step portion 60 further deviates to the left and the ratio P of both the rotation detection sensor 97 provided on the upper left roller ULr and the rotation detection sensor 97 provided on the lower left roller DLr exceeds 50% and neither reaches 100%, the abnormality detection unit 101 determines that the abnormality level is 2. Furthermore, if the travel position of the step portion 60 further deviates to the left and the ratio P of either the rotation detection sensor 97 provided on the upper left roller ULr or the rotation detection sensor 97 provided on the lower left roller DLr reaches 100%, the abnormality detection unit 101 determines that the abnormality level is 3. Furthermore, if the ratio of both rotation detection sensors 97 reaches 100%, the abnormality detection unit 101 determines that the abnormality level is 4.

[0090] In addition, the case where the moving position of the step portion 60 is offset to the left is described here, but when the moving position of the step portion 60 is offset to the right and the step portion 60 is tilted as a whole relative to the original moving direction, the abnormality detection unit 101 can also determine the abnormality level of the escalator 1 according to predetermined judgment conditions.

[0091] The control unit 102 refers to, for example, the predetermined correspondence between abnormality levels and execution processes shown in Table 1 above, and executes a process corresponding to the abnormality level determined by the abnormality detection unit 101. Specifically, when the abnormality level determined by the abnormality detection unit 101 is 1, processing for notification or the like is not executed. However, when the abnormality level is any of 2, 3, and 4, processing for outputting a signal for notifying the abnormality is performed. When the abnormality level is 4, processing for outputting a signal for stopping the operation of the escalator 1 is also performed.

[0092] As described above, in the abnormality detection device 100 of the second embodiment, the abnormality detection unit 101 classifies the degree of abnormality in the escalator 1 into a plurality of levels, determines which level the abnormality of the escalator 1 corresponds to based on the rotation state detected by the rotation detection unit 90, and the control unit 102 executes processing corresponding to the abnormality level determined by the abnormality detection unit 101. Thus, the degree of abnormality in the escalator 1 can be determined in stages, and processing such as notification can be executed that is appropriate to the determined abnormality level.

[0093] Furthermore, the abnormality detection unit 101 can detect abnormalities in the escalator 1 based on the rotational state of each side roller 9 detected by the rotation detection unit 90, and its specific abnormality determination method is not limited to the method described in the above-mentioned embodiments. The abnormality detection unit 101 may also periodically calculate an indicator that can evaluate the degree of abnormality, such as the above-mentioned ratio P, at predetermined time intervals (e.g., every other day), determine the degree of change in the indicator, and determine an abnormality if the degree of change exceeds a reference value (e.g., if the ratio P changes by more than 20%). For example, an abnormality may be determined if a rotation detection sensor that had detected rotation of the side roller 9 until the previous day no longer detects rotation, or if a rotation detection sensor that had detected no rotation of the side roller 9 until the previous day begins to detect rotation.

[0094] Furthermore, in each of the above-described embodiments, the abnormality detection unit 101 may also detect an abnormality based on the rotational state of each side roller 9 detected in an unloaded state such as after the start of operation and before the end of operation of the escalator 1. At this time, the escalator 1 may be in an ascending operation state or a descending operation state.

[0095] Furthermore, in the above-mentioned embodiments, the case where the abnormality detection device for a passenger conveyor of the present disclosure is applied to an escalator has been described, but it can also be applied to a moving walkway.

Claims

1. A passenger conveyor abnormality detection device for detecting abnormalities in a passenger conveyor, the passenger conveyor comprising: a step section having a plurality of steps connected in a ring shape and running along a ring-shaped path including a conveying section for conveying passengers; a left roller on one end side and a right roller on one end side, each of which is disposed at a position at one end side of the conveying section and separated by a predetermined distance from the left and right side surfaces of the step portion traveling in a normal position, wherein the left roller on one end side and the right roller on one end side are disposed so as to be respectively contactable with the left and right sides of the step portion and rotate in association with the travel of the step portion while in contact with the step portion; and The other end side left roller and the other end side right roller are respectively arranged at positions on the other end side of the conveying section, away from the left and right side surfaces of the step portion traveling in the normal position by a predetermined distance, and the other end side left roller and the other end side right roller are arranged to be able to contact the left and right sides of the step portion, respectively, and rotate as the step portion travels while in contact with the step portion. The abnormality detection device comprises: a rotation detection unit that detects whether each of the one end side left roller, the one end side right roller, the other end side left roller, and the other end side right roller is in a rotating state; and An abnormality detecting unit detects an abnormality of the passenger conveyor based on the rotation state detected by the rotation detecting unit.

2. The abnormality detection device for a passenger conveyor according to claim 1, wherein: The abnormality detecting unit detects the abnormality based on a result of the rotation detecting unit repeatedly detecting the rotation state while the step portion travels a predetermined length of at least half a rotation in the looped path.

3. The abnormality detection device for a passenger conveyor according to claim 2, wherein: The abnormality detection unit uses the results obtained by repeatedly detecting the rotation state of the rotation detection unit for the left roller on the one end side, the right roller on the one end side, the left roller on the other end side, and the right roller on the other end side, to calculate the ratio of the interval in which the side roller is in contact with the step portion relative to the overall interval with a predetermined length of more than half a circle of the step portion, and compares the calculated ratio with a predetermined reference value to detect the abnormality.

4. The abnormality detection device for a passenger conveyor according to claim 1, wherein: The abnormality detection device determines that an abnormality has occurred when the rotation detection unit detects that any two of the one end side left roller, the one end side right roller, the other end side left roller, and the other end side right roller are rotating.

5. The abnormality detection device for a passenger conveyor according to any one of claims 1 to 4, wherein: The passenger conveyor includes: a first-end boarding and alighting plate provided at one end of the conveying section; and a second-end boarding and alighting plate provided at the other end of the conveying section. The one-end side left roller and the one-end side right roller are arranged at a position inside the conveying section relative to the one-end side boarding and alighting plate. The other end side left roller and the other end side right roller are arranged on the inner side of the conveying section with respect to the other end side boarding plate.

6. The abnormality detection device for a passenger conveyor according to any one of claims 1 to 4, wherein: The abnormality detection device for the passenger conveyor further includes a control unit that, when an abnormality is detected by the abnormality detection unit, performs at least one of a process of outputting a signal notifying the abnormality and a process of outputting a signal to stop the operation of the passenger conveyor.

7. The abnormality detection device for a passenger conveyor according to claim 5, wherein: The abnormality detection device for the passenger conveyor further includes a control unit that, when an abnormality is detected by the abnormality detection unit, performs at least one of a process of outputting a signal notifying the abnormality and a process of outputting a signal to stop the operation of the passenger conveyor.

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