JP2017030882A - Passenger conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To acquire a passenger conveyor capable of surely performing an operation from addition of double brake forces in a drive path of footsteps to operation resumption.SOLUTION: A main control part of a passenger conveyor adds a brake force to driving wheels by operating an auxiliary brake after operating a main brake at normal stop time, and at operation resumption time for releasing the brake, it releases the main brake after releasing the auxiliary brake on the basis of a command from an operation part which is operated artificially. At emergency time when a first detection part detects abnormality of a driving chain, the main control part operates the auxiliary brake and adds the brake force to the driving wheels, and at operation resumption time for releasing the brake, it releases the auxiliary brake on the basis of the command from a lock release part which is operated artificially. Furthermore, when a second detection part detects the movement of a driving device irrespective of the main brake having received an operation command, the main control part operates the auxiliary brake on the basis of the command from the second detection part, and at the operation resumption time, it releases the auxiliary brake on the basis of the command from the operation part.SELECTED DRAWING: Figure 6

Description

  Embodiments of the present invention relate to passenger conveyors such as escalators or moving walkways.

  An escalator, which is an example of a passenger conveyor, includes a main brake and an auxiliary brake. The main brake is built in a drive device that drives the step via a drive chain, and applies a braking force to the step drive path during normal stoppage.

  The auxiliary brake applies braking force to the drive path of the step when an emergency situation occurs, for example, when the drive chain is broken, the step reversely runs, or the step traveling speed is exceeded.

  Further, there is known an escalator in which the main brake and the auxiliary brake are synchronized with each other and a double braking force is applied to a step drive path during a normal stop. By adopting this configuration, for example, even if some trouble occurs in the main brake, the step can be reliably stopped.

JP 2005-41657 A

  When operating the auxiliary brake in synchronization with the main brake, ensure that the safety of the escalator is restarted sufficiently in both normal and emergency situations, while keeping the step securely stopped Is desired.

  An object of the present invention is to obtain a passenger conveyor that can reliably perform operations from the addition of a double braking force to a drive path of a step to the resumption of operation and improve safety.

According to the embodiment, the passenger conveyor includes a drive device that travels an endless chain connected to a plurality of steps via a drive chain and drive wheels, and a main brake that stops the drive device at a normal time, An auxiliary brake for stopping the drive wheel in an emergency, a first detection unit for detecting that an abnormality has occurred in the drive chain, a second detection unit for detecting movement of the drive device, the main brake, A main control unit that controls the operation of the auxiliary brake.
The main control unit operates the main brake to stop the drive device during a normal stop, and then applies a braking force to the drive wheel by operating the auxiliary brake to resume operation of the drive device. Sometimes, the auxiliary brake is released based on a command from an operation unit that is manually operated, and then the main brake is released.
In an emergency when the first detection unit detects an abnormality in the drive chain, the main control unit operates the auxiliary brake to apply a braking force to the drive wheel, and releases the braking of the drive wheel. When the operation is resumed, the auxiliary brake is released based on a command from the unlocking unit that is manually operated.
Furthermore, when the second detection unit detects the movement of the driving device even though the main brake receives an operation command from the main control unit, the main control unit detects the second detection. The auxiliary brake is operated based on a command from the control unit to apply a braking force to the driving wheel and release the braking of the driving wheel. To do.

It is sectional drawing which shows schematically the escalator which concerns on embodiment. FIG. 2 is a cross-sectional view showing a structure around a drive sprocket provided with an auxiliary brake in the escalator shown in FIG. 1. It is a side view which shows the state which the brake element moved to the operation position. It is a side view which shows the state which the brake element moved to the cancellation | release position. It is a block diagram which shows roughly the control system of a main brake and an auxiliary brake. It is a flowchart which shows the operation | movement and releasing procedure of a main brake and an auxiliary brake.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 discloses an escalator 1 that is an example of a passenger conveyor. The escalator 1 includes a truss 2. The truss 2 includes a lower floor horizontal portion 2a installed on the lower floor 1F, an upper floor horizontal portion 2b installed on the upper floor 2F, a lower floor horizontal portion 2a, and an upper floor horizontal portion. And an inclined portion 2c that connects to 2b.

  The machine room 3 is provided inside the upper floor side horizontal portion 2b. As shown in FIGS. 1 and 2, the machine room 3 accommodates a drive shaft 4, a pair of drive sprockets 5 a and 5 b as drive wheels, and a drive device 6.

  The drive shaft 4 is supported by the truss 2 via bearings 7a and 7b. The drive sprockets 5 a and 5 b are fixed to both ends of the drive shaft 4 and are rotated integrally with the drive shaft 4. A relay sprocket 8 is coaxially fixed to the side surface of one drive sprocket 5a.

  The drive device 6 includes a motor 10 and a speed reducer 11 as main elements. The rotating shaft 10 a of the motor 10 is connected to the input end of the speed reducer 11. A drive chain 12 is wound between the output end of the speed reducer 11 and the relay sprocket 8. The drive chain 12 transmits torque output from the motor 10 to the drive sprockets 5a and 5b.

  As shown in FIG. 1, a driven shaft 13 and a pair of driven sprockets 14 (only one is shown) are accommodated in the lower floor side horizontal portion 2 a of the truss 2. The driven sprocket 14 is fixed to both ends of the driven shaft 13 and is rotated integrally with the driven shaft 13.

  A pair of step chains 16a, 16b are bridged between the drive sprockets 5a, 5b and the driven sprocket 14. The step chains 16a and 16b each have an outward path 17a for transporting passengers and a return path 17b positioned below the outward path 17a. The step chains 16a and 16b travel endlessly inside the truss 2 when the drive sprockets 5a and 5b are rotated by receiving torque from the motor 10.

  A plurality of steps 18 are connected between the step chains 16a and 16b. The step 18 is an element on which a passenger who uses the escalator 1 gets in, and has a front wheel 19a and a rear wheel 19b, respectively. The front wheel 19a and the rear wheel 19b are rotatably in contact with a guide rail (not shown) provided inside the truss 2.

  Therefore, when the step chains 16a and 16b travel, on the forward path 17a of the step chains 16a and 16b, a plurality of steps 18 are arranged stepwise along the inclined portion 2c of the truss 2, and the step chains 16a and 16b travel. It moves to follow. As a result, the passenger who has entered the step 18 is transported from the lower floor 1F to the upper floor 2F or from the upper floor 2F to the lower floor 1F.

  As shown in FIG. 5, the drive device 6 is provided with a drive control unit 20. The drive control unit 20 controls the operation of the motor 10 by operating the power supplied from the commercial power source 21. Thereby, the travel of the step chains 16a and 16b and the travel of the step 18 are controlled.

  Further, balustrades 22 are provided on the right side and the left side of the truss 2, respectively. The balustrade 22 rises from the right and left sides of the truss 2 and extends over the entire length of the truss 2.

  A handrail belt 23 is attached to the outer periphery of the balustrade 22. The handrail belt 23 is an element that a passenger who gets on the step 18 grabs by hand, and runs endlessly in synchronization with the step 18.

  As shown in FIGS. 1 and 2, the escalator 1 is equipped with a main brake 25 used for normal braking and an auxiliary brake 26 used for emergency braking.

  The main brake 25 is incorporated in the speed reducer 11 of the drive device 6, for example. In the present embodiment, an electromagnetic brake is used as the main brake 25. The electromagnetic brake maintains a non-operating state when power is supplied, and switches from a non-operating state to an operating state when power supply is interrupted. When the main brake 25 is switched to an operating state based on a normal brake operation command, a braking force is applied to the speed reducer 11 that receives the torque of the motor 10. Thereby, the drive device 6 is stopped and the operation of the escalator 1 is stopped.

  As shown in FIGS. 2 and 3, the auxiliary brake 26 includes a claw wheel 27, a brake 28 and a solenoid 29 as main elements.

  The pinion wheel 27 is coaxially fixed to the side surface of the other drive sprocket 5b, and follows the drive sprocket 5b and rotates in the direction of arrow A in FIGS. A plurality of engaging claws 31 are formed on the outer peripheral edge of the claw wheel 27. The engaging claws 31 are arranged at intervals in the rotation direction of the claw wheel 27.

  Each engagement claw 31 has an outer surface 31 a that defines the maximum outer diameter of the claw wheel 27 and a pair of side surfaces 31 b that defines the thickness of the claw wheel 27. The side surface 31b is inclined in a direction away from each other as it proceeds from the outer surface 31a toward the tooth bottom of the claw wheel 27. Further, a groove 32 is formed between the adjacent engaging claws 31.

  The brake element 28 is disposed outside the radial direction of the claw wheel 27. The brake element 28 has a size that can enter the groove 32 of the claw wheel 27. The tip 28 a of the brake element 28 is formed in a tapered shape so as to follow the inclination of the side surface 31 b of the engaging claw 31.

  The brake element 28 is supported by the truss 2 so as to linearly reciprocate between the braking position P1 and the release position P2. FIG. 3 shows a state in which the brake element 28 has been moved to the operating position P1. At the operating position P <b> 1, the tip 28 a of the brake element 28 enters the groove 32 of the claw wheel 27 and is hooked on the side surface 31 b of one engaging claw 31 of the claw wheel 27. As a result, the rotation of the ratchet wheel 27 in the direction of arrow A is restricted, and braking force is applied to the drive sprockets 5a and 5b.

  FIG. 4 shows a state in which the brake element 28 is moved to the release position P2. At the release position P <b> 2, the distal end portion 28 a of the brake element 28 is retracted out of the groove portion 32 of the claw wheel 27 and is separated from the side surface 31 b of one engagement claw 31 of the claw wheel 27. For this reason, the engagement between the claw wheel 27 and the brake element 28 is released, and the claw wheel 27 can freely rotate in the direction of arrow A without being obstructed by the brake element 28.

Further, the brake element 28 is always urged toward the operation position P1 via the compression coil spring 33 as an elastic body. The solenoid 29 selectively moves the brake element 28 to the operation position P1 or the release position P2. It is an example of the actuator to be made. The solenoid 29 is turned on when power is supplied, and holds the brake 28 at the release position P2 against the urging force of the compression coil spring 33.

  The solenoid 29 is turned off in a state where the supply of electric power is cut off, and the holding of the brake element 28 is released. Therefore, the brake element 28 moves from the release position P2 to the operating position P1 by the urging force of the compression coil spring 33.

  In the present embodiment, when the operation of the driving device 6 stopped by the operation of the main brake 25 is resumed, an operator requires an artificial operation of manually operating the operation unit 35 shown in FIG. An example of the operation unit 35 is a driving key switch or a return button.

  Furthermore, when releasing the braking of the auxiliary brake 26 with respect to the drive sprockets 5a and 5b, an operator needs to manually perform an operation of manually operating the lock release unit 36 shown in FIG. An example of the lock release unit 36 is a release lever or a release button.

  As shown in FIG. 5, the escalator 1 always monitors whether or not the first detection unit 40 that detects that an abnormality has occurred in the travel of the step 18 and the rotating shaft 10 a of the motor 10 is rotating. 2 detection units 41, and a main control unit 42 connected to the commercial power supply 21.

  The first detection unit 40 indicates that an abnormality has occurred in the escalator 1 when, for example, the drive chain 12 is excessively extended or broken, when the step 18 runs backward, or when the traveling speed of the step 18 exceeds the upper limit. A first detection signal indicating is output.

  The second detection unit 41 outputs a second detection signal indicating the rotation speed of the rotation shaft 10 a of the motor 10. The first detection signal and the second detection signal are input to the main control unit 42. Further, the main control unit 42 receives a first operation resumption signal indicating that the operation unit 35 has been operated and a second operation resumption signal indicating that the lock release unit 36 has been operated.

  The main control unit 42 controls the main brake 25 and the auxiliary brake 26 based on the first detection signal, the second detection signal, the first driving restart signal, and the second driving restart signal. Specifically, when the step 18 is traveling normally, electric power is supplied from the commercial power source 21 to the main brake 25, and the main brake 25 is maintained in a non-operating state.

  At the same time, electric power is supplied from the commercial power source 21 to the solenoid 29 of the auxiliary brake 26, the solenoid 29 is turned on and the brake element 28 is held at the release position P2. In other words, the auxiliary brake 26 is also maintained in a non-operating state.

  For example, when an operation for stopping the escalator 1 is performed by operating a key switch or the like, the main control unit 42 determines whether or not the operation for stopping the escalator 1 in the first step S1 is normal as shown in FIG. Determine whether. When the escalator 1 is normally stopped, the process proceeds to step S2.

  In step S <b> 2, the main control unit 42 cuts off the power supply to the motor 10 and the main brake 25 of the drive device 6. As a result, the main brake 25 switches from the non-operating state to the operating state, and braking force is applied to the speed reducer 11 that receives the torque of the motor 10. For this reason, the drive device 6 stops when a predetermined time elapses after the main brake 25 starts to work.

  If the main brake 25 operates, the process proceeds to step S3. In step S <b> 3, a second detection signal indicating the rotation speed of the rotation shaft 10 a of the motor 10 is input from the second detection unit 41 to the main control unit 42. The main control unit 42 determines whether or not the main brake 25 is operating normally based on the second detection signal.

  If the main brake 25 operates normally and the drive device 6 is stopped, the process proceeds to step S4. In step S <b> 4, the main control unit 42 cuts off the power supply to the solenoid 29 of the auxiliary brake 26. As a result, the solenoid 29 is turned OFF, and the brake 28 is moved from the release position P2 toward the operation position P1 by the urging force of the compression coil spring 33.

  At this time, depending on the relative positional relationship between the brake element 28 and the engagement claw 31 of the claw wheel 27, the tip 28a of the brake element 28 does not enter the groove 32 between the adjacent engagement claws 31 and is specified. May come into contact with the outer surface 31a of the engaging claw 31. Furthermore, even if the distal end portion 28 a of the brake element 28 enters the groove portion 32, the distal end portion 28 a may be separated from the side surface 31 b of the engagement claw 31.

  Even in such a case, there is no problem as long as the driving device 6 is maintained in a stopped state by the operation of the main brake 25. Even if the braking force of the main brake 25 decreases and the claw wheel 27 starts to move together with the drive sprockets 5a and 5b, the brake 28 is biased toward the operating position P1 by the compression coil spring 33. When the engaging claw 31 is disengaged from the tip 28 a of the brake 28, the tip 28 a of the brake 28 enters the groove 32.

  In particular, in the present embodiment, the tip 28 a of the brake element 28 is tapered so as to follow the inclination of the side surface 31 b of the engagement claw 31, so that the tip 28 a of the brake 28 can easily enter the groove 32. .

  As a result, the auxiliary brake 26 is in an operating state, and the rotation of the drive sprockets 5a and 5b is prevented via the hook wheel 27. Accordingly, a double braking force is applied to the drive paths of the step chains 16a and 16b and the step 18 through the main brake 25 and the auxiliary brake 26, and the operation of the escalator 1 is stopped.

  When resuming the operation of the drive device 6 that has been normally stopped, the main control unit 42 determines whether or not an operation for resuming the operation has been performed in step S5. Specifically, when the operator artificially operates the operation unit 35, the first operation resumption signal is input to the main control unit 42. Thereby, the main control unit 42 recognizes that the operation of resuming the operation of the drive device 6 has been properly executed, and proceeds to step S6.

  In step S <b> 6, the main control unit 42 supplies power to the solenoid 29 of the auxiliary brake 26. As a result, the solenoid 29 is turned on, and the brake 28 is moved from the operating position P1 to the release position P2 against the urging force of the compression coil spring 33. As a result, the engagement between the brake element 28 and the engagement claw 31 of the claw wheel 27 is released, and the auxiliary brake 26 is automatically released.

  When the auxiliary brake 26 is released, the main control unit 42 supplies power to the main brake 25 in step S7. As a result, the main brake 25 is switched from the operating state to the non-operating state, and the main brake 25 is automatically released.

  If both the main brake 25 and the auxiliary brake 26 are released, the main control unit 42 supplies power to the motor 10 of the driving device 6 in the subsequent step S8. Thereby, the driving | operation of the drive device 6 is restarted.

  By the way, when the rotation number of the rotating shaft 10a of the motor 10 does not decrease even though the main brake 25 receives the operation command in step S2, the main control unit 42 determines the second detection unit 41 in the previous step S3. Based on the second detection signal from, it is determined that the main brake 25 is not operating normally, and the process proceeds to step S9.

  In step S <b> 9, the main control unit 42 cuts off the power supply to the solenoid 29 of the auxiliary brake 26. As a result, the solenoid 29 is turned OFF, and the brake 28 is moved from the release position P2 toward the operation position P1 by the urging force of the compression coil spring 33.

  As a result, the tip 28 a of the brake element 28 is caught on the side surface 31 b of the engaging claw 31, and the rotation of the drive sprockets 5 a and 5 b is prevented via the claw wheel 27. Accordingly, the travel of the step chains 16a and 16b and the step 18 is forcibly stopped, and the escalator 1 is stopped.

  When releasing the braking of the auxiliary brake 26 for the drive sprockets 5a and 5b, the main control unit 42 determines whether or not the operation for releasing the braking is executed in step S10. When the operator artificially operates the operation unit 35, a first operation resumption signal is input to the main control unit 42. Accordingly, the main control unit 42 recognizes that an artificial operation for releasing the braking of the auxiliary brake 26 has been executed, and proceeds to step S11.

  In step S <b> 11, the main control unit 42 supplies power to the solenoid 29 of the auxiliary brake 26. As a result, the solenoid 29 is turned on, and the brake 28 is moved from the operating position P1 to the release position P2 against the urging force of the compression coil spring 33. As a result, the engagement between the brake element 28 and the engagement claw 31 of the claw wheel 27 is released, and the auxiliary brake 26 is automatically released.

  If the auxiliary brake 26 is released, the process proceeds to the previous step S8, and the operation of the escalator 1 is resumed.

  On the other hand, when the first detection unit 40 detects an abnormality in the drive chain 12 during operation of the escalator 1, a first detection signal is input to the main control unit 42. The main control unit 42 determines that the escalator 1 needs to be emergency stopped in step S1, and proceeds to step S12.

  In step S <b> 12, the main control unit 42 cuts off the power supply to the solenoid 29 of the auxiliary brake 26. As a result, the solenoid 29 is turned OFF, and the brake 28 is moved from the release position P2 toward the operation position P1 by the urging force of the compression coil spring 33. As a result, the tip 28 a of the brake element 28 is caught on the side surface 31 b of the engagement claw 31, and braking force is applied to the drive sprockets 5 a and 5 b via the claw wheel 27. Accordingly, the rotation of the drive sprockets 5a and 5b is prevented and the escalator 1 is stopped.

  When releasing the braking of the auxiliary brake 26 with respect to the drive sprockets 5a and 5b, the main control unit 42 determines whether or not the operation of releasing the braking is executed in step S13. When the operator artificially operates the operation unit 35, a first operation resumption signal is input to the main control unit 42. Accordingly, the main control unit 42 recognizes that an artificial operation for releasing the braking of the auxiliary brake 26 has been executed, and proceeds to step S14.

  In step S <b> 14, the main control unit 42 supplies power to the solenoid 29 of the auxiliary brake 26. As a result, the solenoid 29 is turned on, and the brake 28 is moved from the operating position P1 to the release position P2 against the urging force of the compression coil spring 33. As a result, the engagement between the brake element 28 and the engagement claw 31 of the claw wheel 27 is released, and the auxiliary brake 26 is automatically released.

  If the auxiliary brake 26 is released, the process proceeds to the previous step S8, and the operation of the escalator 1 is resumed.

  According to such an embodiment, when the escalator 1 is normally stopped, the primary emergency auxiliary brake 26 can be operated in cooperation with the main brake 25, and the double braking force is always applied to the step chain 16a, 16b and the step 18 can be added to the drive path.

  For this reason, even if some trouble occurs in the main brake 25, the step chains 16 a and 16 b and the step 18 can be reliably stopped and contribute to the improvement of the safety of the escalator 1.

  Further, when an abnormality occurs in the drive chain 12 or when an unexpected malfunction occurs in the main brake 25 during a normal stop and the main brake 25 does not operate, it is quickly assisted by a command from the main control unit 42. The brake 26 operates and the travel of the step chains 16a and 16b and the step 18 stops.

  At the same time, the main control unit 42 restarts the operation of the escalator 1 when it is recognized that the operation unit 35 and the lock release unit 36 are artificially operated. For this reason, when the operation of the escalator 1 is resumed, human work by the worker is always involved, and the stopped escalator 1 does not start unexpectedly.

  Therefore, it is possible to sufficiently ensure safety when the escalator 1 is restarted in both normal and emergency situations.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the above-described embodiment, the auxiliary brake 26 is operated after the driving device 6 is stopped by the operation of the main brake 25. However, for example, after a predetermined time has elapsed after the main brake 25 starts to work, the auxiliary brake 26 is operated. May be operated. Here, the predetermined time is preferably about 2 to 5 seconds, although it depends on the load acting on the escalator 1 during operation.

  According to this configuration, if the step chains 16a and 16b and the step 18 have already stopped when a predetermined time has elapsed after the main brake 25 starts to work, the tip 28a of the brake 28 is the groove of the claw wheel 27. There is no problem even if it hits the outer surface 31a of the specific engagement claw 31 without entering the 32.

  In this state, even if the braking force of the main brake 25 decreases and the claw wheel 27 starts to move, the tip 28a of the brake 28 that is elastically biased toward the operating position P1 is formed in the groove 32. It enters and is caught by the engaging claw 31. Accordingly, the auxiliary brake 26 operates and the travel of the step chains 16a and 16b and the step 18 is forcibly stopped.

  Furthermore, the passenger conveyor which concerns on embodiment is not specified to an escalator, Even if it is a moving sidewalk arrange | positioned horizontally or inclined, it can implement similarly.

  5a, 5b ... Drive sprocket (drive wheel), 6 ... Drive device, 12 ... Drive chain, 16a, 16b ... Step chain, 18 ... Step, 25 ... Main brake, 26 ... Auxiliary brake, 35 ... Operation part, 36 ... Lock Cancellation part, 40 ... 1st detection part, 41 ... 2nd detection part, 42 ... Main control part.

The auxiliary brake applies braking force to the drive path of the step when an emergency situation occurs, for example, when the drive chain is broken, the step runs backward, or the step traveling speed exceeds the rated speed .

According to the embodiment, the passenger conveyor includes a drive device that travels an endless chain connected to a plurality of steps via a drive chain and drive wheels, and a main brake that stops the drive device at a normal time, An auxiliary brake for stopping the drive wheel in an emergency, a first detection unit for detecting that an abnormality has occurred in the drive chain, a second detection unit for detecting movement of the drive device, the main brake, A main control unit that controls the operation of the auxiliary brake.
The main control unit applies a braking force to the driving wheel by operating the auxiliary brake in a state where the main brake is operated and the driving device is stopped during a normal stop, and the driving device is operated. At the time of resumption , the main brake is released in a state where the auxiliary brake is released based on a command from an operation unit that is manually operated.
In an emergency when the first detection unit detects an abnormality in the drive chain, the main control unit operates the auxiliary brake to apply a braking force to the drive wheel, and releases the braking of the drive wheel. When the operation is resumed, the auxiliary brake is released based on a command from the unlocking unit that is manually operated.
Further, in a state where the second detection unit detects the movement of the driving device, although the main brake receives an operation command from the main control unit, the main control unit The auxiliary brake is operated based on a command from the detection unit to apply a braking force to the drive wheel and release the braking of the drive wheel. Open.

Each engaging claw 31 has an outer surface 31 a that defines the maximum outer diameter of the claw wheel 27, and a pair of side surfaces 31 b that defines the thickness of the engaging claw 31 . The side surface 31b is inclined in a direction away from each other as it proceeds from the outer surface 31a toward the tooth bottom of the claw wheel 27. Further, a groove 32 is formed between the adjacent engaging claws 31.

The first detection unit 40 detects an abnormality in the escalator 1 when, for example, the drive chain 12 extends or breaks excessively, when the step 18 runs backward, or when the traveling speed of the step 18 exceeds the rated speed . A first detection signal indicating this is output.

If both the main brake 25 and the auxiliary brake 26 are released, the main control unit 42 supplies power to the motor 10 of the driving device 6 in the subsequent step S8. Thereby, the operation of the escalator 1 is resumed.

Claims (5)

A drive device for running a step chain in which a plurality of steps are connected endlessly via a drive chain and drive wheels;
A main brake that stops the drive during normal operation;
An auxiliary brake for stopping the drive wheel in an emergency,
A first detector for detecting that an abnormality has occurred in the drive chain;
A second detection unit for detecting movement of the driving device;
A main conveyor that controls operations of the main brake and the auxiliary brake, and a passenger conveyor comprising:
The main control unit applies a braking force to the driving wheel by operating the auxiliary brake after operating the main brake to stop the driving device during a normal stop, At the time of restarting operation, the auxiliary brake is released based on a command from an operation unit that is manually operated, and then the main brake is released.
In an emergency when the first detection unit detects an abnormality in the drive chain, the main control unit operates the auxiliary brake to apply a braking force to the drive wheel, and releases the braking of the drive wheel. When the operation is resumed, the auxiliary brake is released based on a command from the unlocking unit that is manually operated,
Although the main brake receives an operation command from the main control unit, when the second detection unit detects the movement of the drive device, the main control unit receives from the second detection unit. The auxiliary brake is operated based on the command to apply a braking force to the driving wheel, and when the operation is resumed to release the braking of the driving wheel, the auxiliary brake is released based on the command from the operation unit. Constructed passenger conveyor. The auxiliary brake is
A claw wheel that rotates following the drive wheel and has a plurality of engaging claws arranged on the outer peripheral edge at intervals in the rotation direction;
A brake that is movable between an operation position that is hooked on the engagement claw of the claw wheel and a release position that is disengaged from the engagement claw;
An actuator that selectively moves the brake to the operating position or the release position based on a command from the main control unit;
An elastic body that constantly elastically biases the brake toward the braking position;
The passenger conveyor according to claim 1, comprising:   The actuator holds the brake element at the release position against the urging force of the elastic body in a state where electric power is supplied, and releases the holding of the brake element in a state where supply of electric power is cut off The passenger conveyor according to claim 2 configured to do.   4. The main control unit according to any one of claims 1 to 3, wherein the main control unit operates the auxiliary brake in a state where a predetermined time has elapsed since a braking force accompanying the operation of the main brake is applied to the driving device. Passenger conveyor as described in.   The passenger conveyor according to claim 1, wherein the auxiliary brake is automatically released from a braking state during a normal stop.

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