JP5159039B2 - Governor equipment for passenger conveyor - Google Patents

Description

  The present invention relates to a governor device for a passenger conveyor that is used for an escalator, a moving walkway, and other passenger conveyors to detect an excessive driving speed state.

  In general, escalators are each provided with a machine room at the lower part of the floor plate of the upper and lower floors, and in the upper floor side machine room, there are a drive motor as a drive source, a speed reducer, and an output shaft of the drive motor. A drive device including a power transmission mechanism such as a belt that is stretched between the input shaft of the speed reducer is installed.

  When the escalator is operated at an excessive speed when the belt breaks, for example, a mechanical governor device is provided on the rotation shaft of the reduction gear or the rotation shaft of the driving motor in order to detect the excessive speed. ing.

  By the way, the thing of a some structure is proposed as a governor apparatus used for a passenger conveyor.

  In one conventional governor device, a rotating body is fixed to the output shaft of the speed reducer, and a rotating rod (corresponding to a weight) that moves forward and backward against the restoring force of the coil spring according to the rotational speed. The rotating rod that moves outward and protrudes according to the rotational speed of the rotating body presses the switch lever attached to the bracket of the reducer, and operates the micro switch attached near the lever of the bracket. Yes (Patent Document 1).

  Another conventional governor device is a rotating body fixed to a rotating shaft of a driving motor, and the rotating body is always urged toward the center of the rotating body by a spring force of a coil spring and held at a predetermined position. The weight that is displaced outward by the centrifugal force caused by the rotation of the rotating body and the weight that is disposed outside the rotating body and that is displaced outward as the rotational speed of the rotating body increases are in contact with each other. In this case, the speed detector detects that the speed is excessive (Patent Document 2).

  The two governor devices as described above both act on the weight rather than the spring force of the spring urging the weight in the central direction of the rotating body when the speed of the rotating body exceeds a predetermined rotating speed. Centrifugal force increases, and the weight protrudes in the outer peripheral direction of the rotating body. As the weight moves in the outer circumferential direction, the spring force of the spring increases, and the radial position of the weight moving in the outer circumferential direction is a position where the centrifugal force acting on the weight and the spring force of the spring balance. The weight moves further in the outer peripheral direction only when the rotational speed of the rotating body further increases.

  Here, the relationship between the spring force of the spring and the centrifugal force acting on the weight in the above governor device will be described with reference to FIG. In addition, FIG. 11 is the figure which represented typically the weight and spring which comprise a governor apparatus.

  The governor device is fixed to a rotating shaft 101 such as a speed reducer, and rotates in a direction orthogonal to a rotating body 102 that rotates as the rotating shaft 101 rotates and a line that extends radially from the rotation center of the rotating body 102. A support plate 103 erected, a weight 104 disposed outside the support plate 103, and extends from the back side of the weight 104 through the support plate 103 toward the rotation center of the rotating body 102, The tail end side is constituted by a guide rod 106 that passes through the compression spring 105 and is screwed with a spring retainer 106a.

By the way, the initial compression amount from the free length of the compression spring 105 constituting the governor device is X ₀ (m), the spring constant of the spring 105 is k (N / m), and the total mass of the weight 104 and the guide rod 106 is m. (Kg), the distance from the center of rotation of the center of gravity is R ₀ (m), the rotational speed of the rotating body 102 when the weight 104 starts to move in the outer circumferential direction is ω ₀ (rad / sec), and the weight 104 is in the outer circumferential direction. When the movement amount of the weight 104 necessary to detect that the predetermined speed has been reached is ΔX (m) and the rotational speed of the rotating body 102 at that time is ωl (rad / sec), The following relational expression holds.

  That is, since the centrifugal force acting on the weight 104 and the spring force of the spring 105 are balanced at the moment when the weight 104 starts moving in the outer circumferential direction, the following equation is established.

m · R ₀ · ω ₀ ² = k · X ₀ (1)
Further, it is assumed that an excessive speed is detected when the weight 104 moves by ΔX, and at that time, the following relational expression is established.
m · (R ₀ + ΔX) · ωl ² = k · (X ₀ + ΔX) (2)
Therefore, when the above formula (1) is substituted into the formula (2) and rearranged, the following formula is established.
(Ωl / ω ₀ ) ² = (k / m) · (X ₀ + ΔX) / (R ₀ + ΔX)
= (R ₀ · (X ₀ + ΔX)) / (X ₀ · (R ₀ + ΔX)) (3)
Here, for example, when ω ₀ = 1400 rpm (= 146.6 rad / sec), R ₀ = 0.1 m, X ₀ = 0.015 m, ΔX = 0.005 m (= 5 mm),
(Ωl / ω ₀ ) ² = 0.1 · (0.015 + 0.005) / (0.015 · (0.1 + 0.015)) ≈1.159 (4)
Thus, the rotational speed ωl of the rotating body 102 is as follows.
ωl ≒ 1.077 ・ ω ₀ ≒ 1507rpm (5)
Therefore, in the above example, the weight 104 starts to move outward in the radial direction of the rotating body 102 when the rotational speed reaches 1400 rpm, and then the weight 104 continues to move as the speed increases. When an excessive speed is detected after moving 5 mm, the speed is about 1507 rpm. That is, there is a rotational speed difference of 107 rpm from when the weight 104 starts to move until it is detected as an excessive speed.

Therefore, it can be seen that X ₀ needs to be close to R ₀ in order to reduce the rotational speed difference based on the equation (3). This means that a long spring 105 is used.

  Furthermore, as another conventional governor device, an elevator governor has been proposed (Patent Document 3).

  In this elevator governor, an electrical safety device is disposed in the vicinity of the governor sheave, and a pendulum is supported on the surface portion of the governor sheave. The electric safety device has a rectangular parallelepiped case, a crank-shaped cam is rotatably supported in the case, and one end of the roller arm is fixed to one cam rotation shaft protruding outward from the case. Has been. A roller is rotatably attached to the other end of the roller arm.

  In the elevator governor as described above, when the governor sheave is below a predetermined rotational speed, the pendulum is biased in a direction opposite to the moving direction due to the centrifugal force. However, the rotational speed of the pendulum should operate the governor. '', The biasing member, which is a coil spring, is actuated to bias the pendulum in the moving direction and project from the circumferential portion of the governor sheave, and the roller arm is moved via the roller of the electric safety device described above. To drive. As a result, the crank-shaped cam rotates, the arm fixed to the cam moves up and down, and the contact attached inside the case is operated. That is, the excessive speed of the governor sheave is detected by the contact operation.

In this elevator governor, when the governor sheave reaches the topping speed and the pendulum starts to move, the pendulum is maintained in the post-movement state by the biasing force of the biasing member. As a result, it is considered that the difference between the rotation speed when the pendulum starts to move and the rotation speed when the movement is completed can be reduced.
JP 07-315746 A (see FIG. 2) Japanese Patent No. 3261976 (see FIGS. 2 and 3) JP 2004-315128 A (see FIGS. 1 to 3)

  However, the former two governor devices have a large difference between the rotational speed when the weight starts to move and the rotational speed when the excessive speed is detected. Will directly affect the detection accuracy of the rotational speed, and the stability of the governor operating speed may be impaired.

  Also, even when the governor operating speed is not reached, the weight may move unnecessarily, and the moving amount detection characteristics of the weight may fluctuate due to wear of the moving part, or the moving part may be damaged by wear or fatigue. There is a risk that reliability will be reduced.

  Furthermore, if it is going to make the rotational speed difference mentioned above small, it is necessary to lengthen a spring and there exists a problem which the whole governor apparatus will enlarge.

  Further, in the latter elevator governor, in addition to the spring provided on the pendulum side, an urging member that outputs a large urging force by the urging force of the pendulum spring must be provided, and the mechanism becomes complicated. is there.

In particular, in a governor device attached to an input shaft of a speed reducer that rotates at 1200 rpm, for example, if the pendulum is at a radius of 0.1 m,
0. 1 · (1200 · 2π / 60) ^{2 /} 9.8≈160G (6)
Therefore, there is a problem that a large load is applied to the urging member, a large spring is required, and the overall mechanism of the governor is complicated and large.

  The present invention has been made in view of the above circumstances, and can detect an excessively high rotational speed stably without being affected by the detection accuracy of the moving amount of the weight, and moves unnecessarily when the predetermined rotational speed is not reached. It is an object of the present invention to provide a governor device for a passenger conveyor that ensures high reliability by eliminating the weight and reducing the influence of wear and fatigue on the movable part.

In order to solve the above problems, a governor device for a passenger conveyor according to the present invention is provided on a rotating base member attached to a rotating portion of a driving device that drives a step of the passenger conveyor, and the driving device rotates a predetermined amount. A movable weight mechanism having a flyweight that is localized at a predetermined position in the direction of the rotation center of the rotating base member until reaching a speed and that displaces in the outer circumferential direction of the rotating base member when the driving device reaches a predetermined rotation speed or higher. And a fixed base member disposed at a predetermined position of the passenger conveyor, the switch is normally set in a non-actuated state, and when the driving device exceeds a predetermined rotational speed, the flyweight is moved in the outer circumferential direction. And a latch mechanism that operates the switch by displacement.

  The movable weight mechanism is supported by a rotating base member attached to a rotating portion of a driving device that drives the steps of the passenger conveyor, and is rotatable in the rotation center direction and the outer circumferential direction of the rotating base member. The flyweight is connected to the flyweight, the first and second mechanical stoppers for restricting the angle of rotation of the flyweight in the rotation center direction and the outer circumferential direction, and the drive device has a predetermined rotation speed. The flyweight is set in a state of being in contact with a first mechanical stopper that limits the rotation angle in the rotation center direction, and the flyweight is moved in the outer peripheral direction when the driving device becomes a predetermined rotation speed or more. And a spring mechanism that urges the second mechanical stopper so as to be brought into contact with the second mechanical stopper.

  Further, as the latch mechanism, a fixed base member attached to an appropriate support member, a weight mechanism supported so as to be slidable in the vertical direction of the fixed base member, and a predetermined position of the fixed base member are set. A switch, an operation lever connected to the weight mechanism and rotatably supported by the fixed base member, and rotated with a descending slide of the weight mechanism; and a shaft pivotable to the fixed base member The operation lever is normally engaged with the operation lever to prevent the weight mechanism from descending and the rotation of the operation lever is prevented, and the fly lever is displaced in the outer peripheral direction to receive the operation lever. A trigger lever that enables the switch to be operated via the operation lever by rotating it by a predetermined angle.

  Further, as another latch mechanism, a fixed base member attached to an appropriate support member, an operation lever rotatably supported by the fixed base member, a switch that operates by rotation of the operation lever, A spring connected to one end of the operation lever and biased to rotate the operation lever in a direction in which the switch operates, and is pivotally supported by the fixed base member so as to rotate. To prevent the operation lever from rotating against the urging force of the spring, and to receive the displacement of the flyweight in the outer peripheral direction to release the operation lever. And a trigger lever that enables the switch to operate.

  Further, as another latch mechanism, a fixed base member attached to an appropriate support member, a cam plate rotatably supported by the fixed base member and having a cam surface formed on an outer peripheral portion, a cam plate of the cam plate A switch that operates in contact with the cam surface by rotation, a spring that is coupled to the cam plate and biases the cam plate to rotate in a direction in which the switch operates, and is rotatable to the fixed base member The cam plate is normally supported by the engagement with the cam plate and resists the biasing force of the spring to prevent the operation lever from rotating and receives the displacement of the flyweight in the outer peripheral direction. And a trigger lever that allows the cam plate to rotate by the biasing force of the spring.

  According to the present invention, since the flyweight is displaced from the normal position to the outer peripheral direction only when the driving device becomes a predetermined rotational speed or more, stable and excessive rotation is not affected by the detection accuracy of the moving amount of the weight. Since the speed can be detected, there is no problem of unnecessary movement when the rotational speed does not reach the predetermined level, and the influence of wear and fatigue on the moving parts can be reduced. Can be provided.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
FIGS. 1 to 6 are views for explaining a first embodiment of a governor device for a passenger conveyor according to the present invention. 1 is a schematic configuration diagram of, for example, an escalator, which is a passenger conveyor, FIG. 2 is a configuration diagram illustrating a drive device for the escalator, and FIGS. 3 to 6 are configuration diagrams of a governor device.

  Generally, an escalator is installed so as to span between upper and lower floors of a building or the like as shown in FIG. Machine rooms 2a and 2b are provided below the floors 1a and 1b, respectively, and a drive unit 3 is installed in the upper floor side machine room 2a. The drive device 3 includes a speed reducer 11 and an electric motor 12 that drives the speed reducer 11. A sprocket 13 is fixed to the output shaft of the speed reducer 11.

  A driving sprocket 4 is installed in the upper floor machine room 2a, and a driven sprocket 5 is installed in the lower floor machine room 2b. A drive chain 6 is stretched between the drive device 3 and the drive sprocket 4, and the rotational driving force by the drive device 3 is transmitted to the drive sprocket 4 through the drive chain 6. A step chain 7 connected endlessly is spanned between the driving sprocket 4 and the driven sprocket 5, and the rotational driving force of the driving sprocket 4 transmitted from the driving device 3 is transmitted to the driven sprocket 5 through the step chain 7. The steps 8,... Engaged with the step chain 7 travel in the upward direction or the downward direction according to the rotation direction of the driving device 3. Reference numeral 9 denotes a moving handrail.

2A and 2B are diagrams showing the configuration of the driving device 3, wherein FIG. 2A is a side view and FIG. 2B is a front view.
As the driving device 3, a pulley 14 is attached to the output shaft of the electric motor 12 described above, and a pulley 15 is similarly attached to the input shaft of the speed reducer 11. A belt 16 is wound around the pulleys 14 and 15. Yes. For convenience of explanation, a single belt 16 is shown, but a plurality of belts 16,...

  The aforementioned sprocket 13 is attached to the output shaft of the speed reducer 11, and this sprocket 13 is connected to the drive sprocket 4 through the drive chain 6 as shown in FIG. A governor device 20 is disposed between the input shaft surface side of the speed reducer 11 and the pulley 15. A hatched portion of the governor device 20 shown in FIG. 2A shows a schematic cross section of a space occupied by the movable weight mechanism 21 that is a part of the governor device 20 during rotation.

  Next, details of the governor device 20 will be described with reference to FIGS. 3 and 4. 3A is a schematic side view of the governor device 20, FIG. 3B is a front view, and FIG. 4 is an enlarged view of the movable weight mechanism 21.

  The governor device 20 includes a movable weight mechanism 21 attached to the inner surface of the pulley 15 and a latch mechanism 40 attached to a frame (not shown) of the speed reducer 11 and other appropriate support members.

  The movable weight mechanism 21 has a function of operating the latch mechanism 40 when the pulley 15 reaches a predetermined rotational speed or more, and is a rotation base member having, for example, a rectangular shape fixed to the inner surface of the pulley 15. As a rotation base plate 22, a flyweight 23 attached to one end side in the longitudinal direction of the rotation base plate 22 and displaced by centrifugal force due to the rotation of the pulley 15, and the other end side in the longitudinal direction of the rotation base plate 22. And a counterweight 24 is provided which balances the weight of the flyweight 23 and the like. The above-described rotation base member is a member for attaching the constituent member of the movable weight mechanism 21. For example, instead of the rotation base plate 22, a pulley 15 attached to the speed reducer 11 side may be used.

  The flyweight 23 is made of, for example, a “<”-shaped plate-like member, is rotatably attached to a shaft body 23 a protruding from the rotary base plate 22, and a tip end portion thereof is on the rotary base plate 22. It is connected to the distal end portion of the link 27 formed by connecting a tension spring 26 that is hooked to the projecting fixed shaft 25 and a link 27 having a predetermined length. That is, one end portion of the tension spring 26 is latched to the fixed shaft 25, and the other end portion of the tension spring 26 is engaged with a shaft body 27 a protruding from one end surface portion of the link 27. And the front-end | tip part of the flyweight 23 is pivotally supported by the shaft body 27b which protrudes from the front-end | tip part of the link 27 so that rotation is possible.

  Two mechanical stoppers 28 and 29 are mounted on the rotary base plate 22 with a positional relationship such that the flyweight 27 is sandwiched therebetween. The mechanical stoppers 28 and 29 have a function of limiting the rotation angle of the flyweight 23, and the mechanical stopper 28 of the flyweight 23 is rotated when the flyweight 23 rotates in the rotation center direction (clockwise). When the portion corresponding to the dent comes into contact, further rotation in the direction of the rotation center is prevented. When the flyweight 23 rotates in the outer peripheral direction (counterclockwise direction), the mechanical stopper 29 is prevented from further rotating in the outer peripheral direction by contacting the portion corresponding to the convex portion of the flyweight 23.

  FIG. 4 is a diagram showing the position of the flyweight 23 until the pulley 15 on the speed reducer 11 reaches a predetermined rotational speed, and FIG. 5 shows the state when the pulley 15 on the speed reducer 11 side exceeds the predetermined rotational speed. It is a figure which shows the position displacement state of the flyweight.

  On the other hand, the latch mechanism 40 is attached to a fixed base plate 41 fixed to, for example, a frame (not shown) of the speed reducer 11 or an appropriate support member (not shown) as shown in FIG. A long hole 41a extending in the vertical direction is formed on the upper end side of the fixed base plate 41 in the figure, and a notch 41b is formed in the middle portion.

  The latch mechanism 40 includes a weight plate 42 attached to the back side of the fixed base plate 41, and a bolt / nut 42 a inserted through a long hole 41 a formed in the upper portion of the weight plate 42 in the fixed base plate 41. And is slidably attached in the vertical direction. Further, the connection bolt 43 is projected from the weight plate 42 through the notch 41 b of the fixed base plate 41 to the surface side of the fixed base plate 41, and is disposed on the surface of the fixed base plate 41 at the protruding end of the connection bolt 43. An operation plate 44 corresponding to the operation lever to be operated is fixed.

  The operation plate 44 is formed in, for example, a substantially right-angled triangle, and its right-angled corner portion is fixed by the connecting bolt 43 described above, and a notch 44 a is formed in a lower corner portion located on the lower side from the connecting bolt 43. ing. Further, a portion near the right upper corner located at the right end of the operation plate 44 is rotatably supported by a shaft body 44 b protruding from the fixed base plate 41. Therefore, the operation plate 44 is attached so as to rotate around the shaft body 44b in accordance with the vertical slide operation of the weight plate 42. Further, the operation plate 44 has a contact portion 44c having a “<” shape on the upper surface of the right corner of the figure.

  Further, a mechanical stopper 44 d for restricting the rotation angle of the operation plate 44 is disposed at a lower equivalent position of the inclined side portion of the operation plate 44.

  Further, a trigger lever 45 is rotatably supported via a shaft body 45a at a lower portion of the fixed base plate 41 than the mechanical stopper 44d. The trigger lever 45 has, for example, a “<” shape, and a protruding portion 45 b that protrudes roundly is formed on a part of the side facing the speed reducer-side pulley 15. It is engaged with the notch 44a.

  Regarding the relationship among the weight plate 42, the operation plate 44, and the trigger lever 45, the weight of the weight plate 42 is transmitted to the operation plate 44 through the connecting bolt 43, and the operation plate 44 rotates counterclockwise around the shaft body 44b. However, when the left end portion of the trigger lever 45 is stretched, the stop state is maintained without being lowered.

  Note that the protrusion 45b of the trigger lever 45 does not normally contact the flyweight 23, but the tip of the flyweight 23 rotates in the outer peripheral direction and is limited by the mechanical stopper 29 as shown in FIG. Is provided at a position where it interferes with the outer periphery of the flyweight 23.

  Reference numeral 46 denotes a micro switch, which is mounted on the fixed base plate 41 toward the contact portion 44c of the corner upper surface portion of the operation plate 44. The head 46 a of the micro switch 46 faces the contact portion 44 c of the operation plate 44 in a non-actuated state.

Next, the operation of the governor device 20 configured as described above will be described.
When an abnormality occurs in the escalator and the pulley 15 exceeds a predetermined rotational speed, the centrifugal force acting on the flyweight 23 increases, and the tip of the flyweight 23 is against the initial tension of the tension spring 26. Try to rotate in the direction. Here, when the flyweight 23 starts to rotate, the center of gravity of the flyweight 23 is displaced in the outer circumferential direction, and the point where the tension spring 26 extends most and reaches the position where it abuts on the mechanical stopper 29 as shown in FIG. Rotate.

  As a result, the outer peripheral portion of the flyweight 23 acts so as to push up in contact with the protrusion 45b of the trigger lever 45, so that the trigger lever 45 rotates counterclockwise. Then, the illustrated left end portion of the trigger lever 45 is disengaged from the notch portion 44a of the operation plate 44, and the operation plate 44 rotates counterclockwise as the weight plate 42 slides downward. As a result, the contact portion 44c at the upper right end portion of the operation plate 44 performs an operation of pushing the head portion 46a of the limit switch 46, and the inclined side portion of the operation plate 44 contacts the mechanical stopper 44d. To the state of. As a result, it is possible to reliably detect that the rotational speed is excessive, and a predetermined danger avoiding operation is performed by not returning to the initial state. Furthermore, the excessive rotation speed state is transmitted to the control device and the monitoring room of the passenger conveyor by the detection signal output from the limit switch 46.

  When the tip of the flyweight 23 starts to rotate, the center of gravity of the flyweight 23 moves outward to increase the centrifugal force, and the moment for returning the flyweight 23 by the tension spring 26 decreases. Further, when the tension spring 26 passes the position where it is most extended, the flyweight 23 is biased outward by the tension spring 26.

  Therefore, according to the embodiment as described above, the flyweight 23 does not rotate around the shaft body 23a due to the tension of the tension spring 26 until the rotation base plate 22 reaches a predetermined rotation speed. Therefore, the flyweight 23 does not move unnecessarily and vibrates, and can maintain a stable detection operation for a long period of time.

  Further, once the rotation base plate 22 reaches a predetermined rotation speed and the flyweight 23 starts to move, it rapidly moves in the counterclockwise direction on the outer periphery, so that the difference between the speed at the start of the operation and the speed at the end of the operation. Thus, an excessive speed can be detected with high accuracy without being affected by the detection accuracy of the amount of movement of the flyweight 23 corresponding to the weight as in the prior art.

(Second Embodiment)
7 and 8 are views for explaining a second embodiment of a governor device for a passenger conveyor according to the present invention. FIG. 7 is a diagram for explaining the operating state of the governor device 20 until the pulley 15 on the speed reducer 11 side reaches a predetermined rotational speed, and FIG. 8 shows that the pulley 15 on the speed reducer 11 side exceeds the predetermined rotational speed. It is a figure explaining the operating state of the governor apparatus 20 at the time.

  The governor device 20 in this embodiment includes a movable weight mechanism 21 and a latch mechanism 50 that is fixed using a frame of the speed reducer 11 or the like. Since the movable weight mechanism 21 has the same configuration as that of the first embodiment, the same portions are denoted by the same reference numerals, and description of the configuration is omitted.

In this embodiment, the difference is in the latch mechanism 50.
The latch mechanism 50 is provided on a frame (not shown) of the speed reducer 11 or a fixed base plate 51 attached to the frame. The trapezoidal top of the fixed base plate 51 is disposed so as to face the pulley 15 side on the reduction gear 11 side. In the vicinity of the top of the trapezoidal shape of the fixed base plate 51, for example, a “<”-shaped trigger lever 52 is rotatably attached via a shaft body 52a. The trigger lever 52 is supported by the shaft body 52a at the center portion of the "<" shape, and a rounded protruding portion 52b is formed at the lower end facing the pulley 15 side.

  The protrusion 52b does not normally contact the flyweight 23, but interferes with the outer periphery of the flyweight 23 when the tip of the flyweight 23 rotates in the outer periphery and reaches the position shown in FIG. It is supposed to be.

  Further, the operation plate 53 is disposed so as to be inclined upward from the left end of the fixed base plate 51 toward the upper end side of the trigger lever 52 located in the right direction of the drawing.

  The operation plate 53 is formed with a step having a wide surface from the middle portion toward the tip, and a notch 53a is formed in a part of the tip protruding surface, and the notch 53a has a notch 53a. The upper end portion of the trigger lever 52 described above is engaged.

  Further, the operation plate 53 is rotatably supported by a shaft body 53 b that protrudes from the fixed base plate 51 at an intermediate portion thereof, and a pin 54 that protrudes from the upper end surface of the fixed base plate 51 at the lower end of the plate. The tension spring 55 is hooked to the lower end portion of the tension spring 55. Therefore, the lower end portion of the operation plate 53 is always held in a state of being pulled by the spring force of the tension spring 55, and as a result, the notch portion 53a of the operation plate 53 and the upper end portion of the trigger lever 52 are reliably engaged. Has been.

  The microswitch 56 is arranged from the upper part of the fixed base plate 51 toward the step surface of the operation plate 53, that is, the step surface which is the lower side of the operation plate 53 which is closer to the left side than the shaft body 53b. The head portion 56a of the micro switch 56 is set so as to approach or contact the lower step surface of the operation plate 53 in a non-operating state.

  A mechanical stopper 57 projects from the lower part of the operation plate 53 on the fixed base plate 51 at a predetermined distance from the lower part on the relatively distal end side. The mechanical stopper 57 has a function of limiting the rotation angle of the operation plate 53 in the clockwise direction.

Next, the operation of the governor device 20 configured as described above will be described.
When some abnormality occurs in the escalator and the pulley 15 exceeds a predetermined rotational speed, the centrifugal force acting on the flyweight 23 increases as described above, and the flyweight 23 is resisted against the initial tension of the tension spring 26. The tip portion rotates to the outer peripheral side, the outer peripheral side portion of the flyweight 23 comes into contact with the protruding portion 52b of the trigger lever 52, and the trigger lever 52 rotates in the clockwise direction.

  As a result, the upper end portion of the trigger lever 52 and the notch 63a of the operation plate 53 are disengaged, and the operation plate 53 is rotated in the clockwise direction by the tensile force of the tension spring 55. Performs the operation of pushing the head portion 56a of the limit switch 56, and the lower end of the operation plate 53 comes into contact with the mechanical stopper 57, resulting in a state as shown in FIG. As a result, it is possible to reliably detect that the rotational speed is excessive, and a predetermined danger avoiding operation is performed by not returning to the initial state. Furthermore, the excessive rotation speed state is transmitted to the control device and the monitoring room of the passenger conveyor by the detection signal output from the limit switch 46.

  Therefore, according to the embodiment as described above, the flyweight 23 does not rotate around the shaft body 23a due to the tension of the tension spring 26 until the rotation base plate 22 reaches a predetermined rotation speed. Therefore, the flyweight 23 does not move unnecessarily or vibrates, and can maintain a stable detection operation for a long period of time.

  Further, once the rotation base plate 22 reaches a predetermined rotation speed and the flyweight 23 starts to move, it rapidly moves in the counterclockwise direction on the outer periphery, so that the difference between the speed at the start of the operation and the speed at the end of the operation. Thus, an excessive speed can be detected with high accuracy without being affected by the detection accuracy of the amount of movement of the flyweight 23 corresponding to the weight as in the prior art.

  In addition, since the tension spring 55 is used, not only can the installation space be reduced, but if the tension force of the tension spring 55 is increased, the limit switch 56 can be reliably operated with a large pressing force.

(Third embodiment)
9 and 10 are diagrams for explaining a third embodiment of a governor device for a passenger conveyor according to the present invention. FIG. 9 is a diagram for explaining the operating state of the governor device 20 during normal operation until the pulley 15 on the speed reducer 11 side reaches a predetermined rotational speed, and FIG. 10 shows that the pulley 15 on the speed reducer 11 side exceeds the predetermined rotational speed. FIG. 5 is a diagram for explaining the operating state of the governor device 20 at the time of, that is, when the pulley 15 is at an excessively high rotational speed.

  The governor device 20 in this embodiment includes a movable weight mechanism 21 and a latch mechanism 60 that is fixed using a frame (not shown) of the speed reducer 11 and the like, as in the above-described embodiment. .

  Since the movable weight mechanism 21 has the same configuration as that of the first embodiment, the same portions are denoted by the same reference numerals, and description of the configuration is omitted.

In this embodiment, the difference is in the latch mechanism 60.
The latch mechanism 60 is provided on a frame (not shown) of the speed reducer 11 or a fixed base plate 61 attached to the frame.

  A trigger lever 62 having, for example, a “<” shape is rotatably attached via a shaft body 62 a so as to have an opening upward at a position slightly below the center of the fixed base plate 61. The trigger lever 62 is supported by the shaft body 62a at the substantially central portion of the "<" shape, and has a roundness at the lower end facing the pulley 15 side closer to the right side than the shaft body 62a. A protruding portion 62b is formed.

  The protrusion 62b does not contact the flyweight 23 at all times, but interferes with the outer peripheral portion of the flyweight 23 when the tip of the flyweight 23 rotates in the outer peripheral direction and reaches the position shown in FIG. It is supposed to be.

  In addition, a shaft body 63a protrudes from a substantially central portion of the fixed base plate 61. A part of the outer periphery of the shaft body 63a is cut out to reduce the diameter, and the remaining outer periphery gradually increases in diameter. A cam plate 63 formed in the above is rotatably attached. During normal operation, the illustrated left end portion of the trigger lever 62 is engaged with a notch portion 63 b at the left end portion having a small diameter formed on the lower outer periphery of the cam plate 63.

  A pin 63 c is attached to the back side of the upper portion of the cam plate 63. One end of the tension spring 64 is hooked on the pin 63c, and the other end of the tension spring 64 is engaged with a pin 65 protruding from the back side of the lower end of the fixed base plate 61. That is, the cam plate 63 acts to rotate counterclockwise by the pulling force of the tension spring 64.

  Further, a micro switch 66 is arranged from the upper end surface of the fixed base plate 61 toward a surface portion having a large diameter on the upper outer peripheral surface of the cam plate 63, and a head 66a of the micro switch 66 is formed on the cam plate 63 having a large diameter. The upper outer peripheral surface is set in a non-operating state or in a contacted state.

Next, the operation of the governor device 20 configured as described above will be described.
When an abnormality occurs in the escalator and the pulley 15 exceeds a predetermined rotational speed, the centrifugal force acting on the flyweight 23 increases, and the tip of the flyweight 23 is against the initial tension of the tension spring 26. Try to rotate to the side. Here, when the flyweight 23 starts to rotate, the center of gravity of the flyweight 23 is displaced to the outer peripheral side, and the tension spring 26 passes through the point where it extends the most, and rotates to a position where it contacts the mechanical stopper 29 as shown in FIG. To do.

  As a result, the outer peripheral portion of the flyweight 23 comes into contact with the protruding portion 62b of the trigger lever 62, and the trigger lever 62 rotates counterclockwise. Then, the left end portion of the trigger lever 62 shown in the figure is disengaged from the notched portion 63b of the cam plate 63, and the cam plate 63 rotates counterclockwise by the spring force of the tension spring 64, and the cam gradually increases in diameter. The head 46a of the limit switch 66 is pushed in by the outer periphery of the plate 63, and the state shown in FIG. 10 is reached. As a result, it is possible to reliably detect that the rotational speed is excessive, and a predetermined danger avoiding operation is performed by not returning to the initial state. Furthermore, the excessive rotation speed state is transmitted to the control device and the monitoring room of the passenger conveyor by the detection signal output from the limit switch 66.

  Therefore, according to the embodiment as described above, the same effect as the first and second embodiments described above can be obtained, and the cam plate 63 that gradually increases in diameter can be provided at the portion where the limit switch 66 is operated. Since the limit switch 66 is operated using the limit switch 66, the operation speed of the limit switch 66 does not become excessive, and the limit switch 66 can be operated with a sufficiently strong pressing force.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary, various deformation | transformation can be implemented.

  In the above embodiment, the constituent members of the movable weight mechanism 21 are attached to the rotary base plate 22, but may be directly attached to the pulley 15, or may be other rotary bodies including the rotary base plate 22. For example, the structure attached to the pulley 14 by the side of the electric motor 12 may be sufficient.

  Further, although the flyweight 23 is formed in a “<” shape, it may have any shape that is displaced in the outer circumferential direction when the pulley described above reaches a predetermined rotational speed or more. Further, the micro switch 46, 56, 66 detects the state when the pulley exceeds the predetermined rotational speed. However, the switch is not limited to the micro switch as long as the switch has a similar function.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the gist thereof.

The figure which shows schematic structure of the escalator which is a kind of passenger conveyor. It is a block diagram which shows an example of the drive device used for an escalator, Comprising: The figure (a) is a side view, The figure (b) is a front view. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows 1st Embodiment of the governor apparatus of the passenger conveyor which concerns on this invention, Comprising: The figure (a) is a side view, The figure (b) is a front view. The figure which shows the position state of the flyweight until the pulley attached to the rotating shaft by the side of a reduction gear reaches predetermined rotational speed. The figure which shows the position state of a flyweight when the pulley attached to the rotating shaft by the side of a reduction gear becomes more than predetermined | prescribed rotational speed. The figure explaining the linkage relation of the movable weight mechanism and latch mechanism which comprise a governor apparatus. The block diagram at the time of normal operation explaining 2nd Embodiment of the governor apparatus of the passenger conveyor which concerns on this invention The figure explaining the operation | movement relationship between a movable weight mechanism and a latch mechanism when the pulley attached to the rotating shaft by the side of a reduction gear becomes more than predetermined | prescribed rotational speed. The block diagram at the time of normal operation explaining 3rd Embodiment of the governor apparatus of the passenger conveyor which concerns on this invention The figure explaining the operation | movement relationship between a movable weight mechanism and a latch mechanism when the pulley attached to the rotating shaft by the side of a reduction gear becomes more than predetermined | prescribed rotational speed. The figure explaining the relationship between the spring force and weight of the spring in the conventional governor apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Drive device, 4 ... Drive gear, 5 ... Drive gear, 6 ... Drive chain, 7 ... Step chain, 8 ... Step, 11 ... Reduction gear, 12 ... Electric motor, 13 ... Sprocket, 14, 15 ... Pulley, 16 ... Belt, 20 ... governor device, 21 ... movable weight mechanism, 22 ... rotating base plate, 23 ... fly weight, 24 ... counterweight, 26, 64 ... tension spring, 27 ... link, 28, 29 ... mechanical stopper, 40, 50 , 60 ... latch mechanism, 41, 51, 61 ... fixed base plate, 41a ... long hole, 42 ... weight plate, 43 ... connection bolt, 44, 53 ... operation plate, 44a, 53a, 63b ... notch, 45b, 52b, 62b ... projecting portion, 44d ... mechanical stopper, 45, 52, 62 ... trigger lever, 46, 56, 66 ... micro switch, 55 ... tension spring, 3 ... cam plate,

Claims (5)

Provided on a rotating base member attached to a rotating portion of a driving device that drives a step of a passenger conveyor, and the driving device is localized at a predetermined position in the rotation center direction of the rotating base member until a predetermined rotation speed is reached, A movable weight mechanism having a flyweight that displaces in the outer circumferential direction of the rotating base member when the drive device has reached a predetermined rotational speed or more;
Displacement in the outer peripheral direction of the flyweight provided on a fixed base member disposed at a predetermined position of the passenger conveyor, when the switch is normally set in a non-operating state, and when the driving device exceeds a predetermined rotational speed And a latch mechanism for actuating the switch,
The movable weight mechanism includes a rotation base member attached to a rotating portion of a driving device that drives a step of a passenger conveyor, and a flyweight supported so as to be rotatable in a rotation center direction and an outer peripheral direction of the rotation base member. And the first and second mechanical stoppers that limit the angle of rotation of the flyweight in the rotation center direction and the outer circumferential direction, and the flyweight connected to the flyweight until the drive device reaches a predetermined rotation speed. The flyweight is set to be in contact with the first mechanical stopper that restricts the rotation angle in the rotation center direction, and the flyweight is rotated in the outer peripheral direction when the driving device becomes a predetermined rotation speed or more. A passenger mechanism that biases the second mechanical stopper so as to be brought into contact with the second mechanical stopper that limits the angle. A of the governor.   The spring mechanism includes a link having one end pivotally supported at the tip of the flyweight, and a tension spring having one end connected to the other end of the link and the other end hooked to the rotating base member. The governor device for a passenger conveyor according to claim 1. Provided on a rotating base member attached to a rotating portion of a driving device that drives a step of a passenger conveyor, and the driving device is localized at a predetermined position in the rotation center direction of the rotating base member until a predetermined rotation speed is reached, A movable weight mechanism having a flyweight that displaces in the outer circumferential direction of the rotating base member when the drive device has reached a predetermined rotational speed or more;
Displacement in the outer peripheral direction of the flyweight provided on a fixed base member disposed at a predetermined position of the passenger conveyor, when the switch is normally set in a non-operating state, and when the driving device exceeds a predetermined rotational speed And a latch mechanism for actuating the switch,
The latch mechanism includes a fixed base member attached to an appropriate support member, a weight mechanism supported so as to be slidable in the vertical direction of the fixed base member, and a switch set at a predetermined position of the fixed base member, An operation lever connected to the weight mechanism and rotatably supported by the fixed base member, and pivoted with a descending slide of the weight mechanism; and pivotally supported by the fixed base member; At all times, the engagement with the operation lever prevents the weight mechanism from descending and prevents the operation lever from rotating, and receives the displacement of the flyweight in the outer peripheral direction to rotate the operation lever at a predetermined angle. And a trigger lever that enables the switch to be operated via the operation lever. Apparatus. The latch mechanism includes a fixed base member attached to an appropriate support member, an operation lever rotatably supported by the fixed base member, a switch operated by the rotation of the operation lever, A spring connected to one end and urged to rotate the operating lever in a direction in which the switch operates, and is pivotally supported by the fixed base member so as to be rotatable . The operation lever is prevented from rotating against the biasing force of the spring, and the engagement of the operation lever is released in response to the displacement of the flyweight in the outer circumferential direction, and the switch is operated via the operation lever. A passenger lever governor device according to claim 1, further comprising a trigger lever that enables the operation of the passenger conveyor.   The latch mechanism includes a fixed base member attached to an appropriate support member, a cam plate rotatably supported on the fixed base member and having a cam surface formed on an outer peripheral portion thereof, and the cam plate by rotation of the cam plate. A switch that operates in contact with a surface, a spring that is coupled to the cam plate and biases the cam plate to rotate in a direction in which the switch operates, and is pivotally supported by the fixed base member. In the normal state, the engagement with the cam plate prevents the operation lever from rotating against the biasing force of the spring, and the cam plate is engaged with the displacement of the flyweight in the outer circumferential direction. The passenger conveyor according to claim 1, further comprising a trigger lever that releases and allows the cam plate to rotate by the biasing force of the spring. Bana apparatus.

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