JP3599584B2 - Passenger conveyor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a passenger conveyor such as an escalator and an electric road, and more particularly, to a passenger conveyor employing a novel driving mechanism.
[0002]
[Prior art]
A general passenger conveyor, for example, an escalator, connects a plurality of steps to a pair of endless step chains on both sides in the step width direction , winds the pair of step chains around a driving sprocket and a driven sprocket, and drives the driving sprocket. By rotating, the steps are circulated between the two steps. The left and right driving sprockets wound around a pair of endless step chain is fixed to a common shaft, so that transmit power on one side of this axis by fixing the sprocket for power transmission (Japanese Patent Laid-Open 3-297792).
[0003]
[Problems to be solved by the invention]
Above structure, since the structure for transmitting power from one side of the shaft holding the right and left driving sprockets, twist on the opposite side of the drive sprocket of the shaft end of the power transmission side is generated, the left and right drive sprocket teeth The phase may be shifted. When the phase shift occurs, the left and right step chains are shifted with respect to the traveling direction, so that the steps do not run in parallel, and the movement of the steps is unreasonable.
[0004]
In order to eliminate the phase shift of the teeth of the driving sprocket, the diameter of the shaft supporting the driving sprocket may be increased so as to withstand torsion, but this increase in the shaft diameter leads to the enlargement of peripheral equipment. There is.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a new passenger conveyor capable of eliminating a phase shift between teeth of left and right driving sprockets without increasing a shaft diameter.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention independently supports the left and right drive sprockets around which a pair of step chains connecting the steps are wound, and divides these drive sprockets into two systems from the same output shaft of the driving machine. Each of the gears is driven by a gear device so that the step passes between the central portions of the left and right driving sprockets .
[0007]
According to the above configuration, since each driving sprocket is driven under the same conditions, it is possible to eliminate the phase shift between the teeth of the left and right driving sprockets due to the twist of the shaft.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the escalator shown in FIGS.
[0009]
The escalator 1 supports a driving sprocket 4 (4A, 4B) in an upper machine room 3 in a frame 2 installed over the upper and lower floors, and a driven sprocket 6 in a lower machine room 5. An endless step chain 7 is wound around the driving sprocket 4 and the driven sprocket 6, and a plurality of steps 8 are connected to the step chain 7. The step chain 7 is driven by rotating a driving sprocket 4 by a driving machine 9 installed in the upper machine room 3.
[0010]
On the other hand, a balustrade 10 fixed to the frame 2 is provided on both sides in the width direction of the step 8, and a handrail belt 11 is configured to move along the periphery of the balustrade 10 in synchronization with the step 8.
[0011]
In the above configuration, the left and right driving sprockets 4A and 4B around which the pair of step chains 7 are wound are attached to the output shafts 13 of the gear devices 12A and 12B fixed to the frame 2 by press fitting or shrink fitting. The configurations of these gear devices 12A and 12B are configured under exactly the same conditions. That is, a gear 14 is fixed to the output shaft 13, a gear 15 meshing with the gear 14 is fixed to another shaft 16, and a gear 17 meshing with the gear 15 is mounted on the input shafts 18A and 18B.
[0012]
The drive unit 9 includes a speed reducer 30 and a motor 31, and an output shaft 32 of the motor 31 is connected to an input shaft 33 of the speed reducer 30 via a coupling.
[0013]
The speed reducer 30 is fixed to the frame 2 at an intermediate position between the two gear devices 12A and 12B. The output shaft 34 of the speed reducer 30 projects to both sides and is connected to the input shafts 18A, 18B of the gear devices 12A, 12B via a coupling.
[0014]
Incidentally, the motor 31 usually has a capacity that can be driven by one unit. However, two motors 31 and 31 ′ may be connected to both sides of the input shaft of the speed reducer 30 as needed. When two motors 31 and 31 'are connected, it is preferable that the motors have the same characteristics.
[0015]
With the configuration described above, the motive power from the drive unit 9 (the reduction gear 30, the motor 31) is transmitted separately from the output shaft 34 of the reduction gear 30 to the input shafts 18A, 18B of the left and right gear units 12A, 12B. Since the drive shafts are transmitted from the output shafts 13 of the gear units 12A and 12B to the respective drive sprockets 4A and 4B, if the components from the output shaft 34 of the speed reducer 30 to the respective drive sprockets 4A and 4B are configured under the same conditions, both drive units No phase difference occurs between the sprockets 4A and 4B.
[0016]
In addition, according to the above configuration, since there is no shaft connecting the left and right driving sprockets 4A and 4B, the step 8 moves through the center of the left and right sprockets 3 as shown by the two-dot chain line in FIG. 4B, the vertical dimension H when the steps 8 are reversed can be reduced. Therefore, since the height of the frame 2 of the escalator 1 for storing these can be reduced, it is possible to secure the height from the steps 8 to the ceiling even if the escalator 1 is left on the existing stairs, for example. Installation work is simplified, for example, work such as digging the floor is minimized.
[0017]
Further, since the speed reducer 30 that transmits torque to the gear devices 12A and 12B that hold the left and right drive sprockets 4A and 4B is disposed substantially at the center of the left and right drive sprockets 4A and 4B, the left and right gear devices 12A , 12B of the input shafts 18A, 18B can be made substantially the same. Therefore, the difference between the lengths of the left and right input shafts 18A, 18B is small, so that the amount of twist of both shafts 18A, 18B is small, and the input shafts 18A, 18B to the gear units 12A, 12B and the reduction gear 30 Since the shaft diameter d of the output shaft 34 may be considered with respect to the torsional stress generated by the torque, the shaft diameter can be significantly reduced as compared with the related art.
[0018]
Further, since the speed reducer 30 is disposed substantially at the center, the motor 31 can be mounted on both sides of the speed reducer 30. For this reason, when the driving torque required for the escalator 1 increases, the motor 31 'that generates the increased torque is added to make the motor equivalent to one motor having a large capacity. Therefore, the height of the motor 31 can be reduced, and the types of the motor 31 can be reduced and standardized.
[0019]
By the way, in the above embodiment, the escalator has been described as the passenger conveyor, but the present invention is not limited to the escalator but can be applied to an electric road. Furthermore, the passenger conveyor described in the above embodiment may be a passenger conveyor in which the treads of the steps or treads are moved downward on the return path side, or a passenger conveyor in which the treads are moved upward on the return path side. Can be applied.
[0020]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the new passenger conveyor which can eliminate the shift | offset | difference of the phase of the tooth | gear of right and left drive sprockets without enlarging the shaft diameter of a drive sprocket can be obtained.
[Brief description of the drawings]
FIG. 1 is a plan view showing one embodiment of a driving mechanism of a passenger conveyor of the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a schematic side view showing an escalator which is a passenger conveyor according to the present invention.
[Explanation of symbols]
1 ... escalator, 2 ... frame, 4, 4A, 4B ... drive sprocket,
Reference numeral 6: driven sprocket, 7: step chain, 8: step, 9: driving machine, 12A, 12B: gear device, 18A, 18B: input shaft, 30: reduction gear, 31: motor,
34 output shaft.

Claims (3)

Pivoted independently left and right driving sprockets wound around a pair of step chain coupled to the steps, these drive sprocket respectively were driven by the gearing divided from the same output shaft to the two systems of driving machine, driving of the left and right A passenger conveyor , wherein the steps pass between central portions of sprockets . A frame installed over the upper and lower floors, a pair of drive sprockets and driven sprockets provided in a machine room provided at both ends of the frame, and a plurality of steps wound around the pair of drive sprockets and driven sprockets In a passenger conveyor provided with a step chain connecting the drive sprocket and a drive unit for driving the drive sprocket, a gear device having the same function as the output shaft of the drive unit, independently supporting the pair of drive sprockets. A passenger conveyor, wherein the drive shafts are connected to output shafts of these gear units, and the steps pass between central portions of the left and right drive sprockets. . 3. The passenger conveyor according to claim 2, wherein the driving device includes a speed reducer and a motor, and the speed reducer is installed at a center of the left and right gear units.

Images