Passenger conveyor

Abstract

To downsize a boss to which a plurality of sprockets can be mounted.SOLUTION: A passenger conveyor comprises: a boss integrally rotating with a drive shaft; a drive sprocket that can be mounted on the boss; a sprocket for moving a footstep; and a sprocket for moving a handrail. The boss comprises: a cylindrical part into which each sprocket is fit; and a flange part to which each sprocket is fixed. The flange part has a plurality of thick wall parts and a plurality of thin wall parts adjoining each other in a circumferential direction of the boss. Each of the plurality of thick wall parts has a first fixing hole for fixing the drive sprocket and the sprocket for moving the footstep to the flange part. The plurality of thin wall parts have a second fixing hole for fixing the sprocket for moving the handrail to the flange part.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to passenger conveyors such as escalators and moving walkways. [Background technology]

[0002] Passenger conveyors such as escalators and moving walkways include a drive shaft, a boss fixed to the drive shaft, a drive sprocket attached to the boss, a drive unit that rotates the drive sprocket via a drive chain, and a pair of bearings that rotatably support both ends of the drive shaft (see, for example, Patent Document 1). In addition to the drive sprocket, multiple sprockets, such as a sprocket for moving between steps and a sprocket for moving between handrails, are attached to the boss. For this reason, the boss has a stepped flange portion for mounting the multiple sprockets. Furthermore, the flange portion of the boss is provided with multiple holes for fixing the multiple sprockets. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-69800 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the past, the pitch circle diameter of the holes provided for fixing the handrail movement sprocket to the flange of the boss was larger than the pitch circle diameter of the holes provided for fixing the drive sprocket and the step movement sprocket to the flange of the boss, which meant that it was necessary to ensure a large outer diameter for the entire boss, including the flange.

[0005] An object of the present invention is to provide a passenger conveyor that can reduce the size of a boss to which multiple sprockets are attached. [Means for solving the problem]

[0006] In order to solve the above problems, for example, the configurations described in the claims are adopted. The present application includes a number of means for solving the above problems, one of which is a passenger conveyor including a drive shaft, a boss rotating integrally with the drive shaft, and a drive sprocket, a sprocket for moving through steps, and a sprocket for moving through a handrail attached to the boss. The boss has a cylindrical portion into which the drive sprocket, the sprocket for moving through steps, and the sprocket for moving through a handrail are fitted, and a flange portion to which the drive sprocket, the sprocket for moving through steps, and the sprocket for moving through a handrail fitted to the cylindrical portion are fixed. The flange portion has a number of thick portions and a number of thin portions adjacent to each other in the circumferential direction of the boss. Each of the thick portions has a first fixing hole for fixing the drive sprocket and the sprocket for moving through steps to the flange portion. Each of the thin portions has a second fixing hole for fixing the sprocket for moving through a handrail to the flange portion. Effect of the Invention

[0007] According to the present invention, the boss to which a plurality of sprockets are attached can be made smaller. Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic side view showing a configuration example of a passenger conveyor according to a first embodiment. FIG. [Diagram 2] FIG. 2 is a schematic plan view showing a part of the passenger conveyor shown in FIG. [Diagram 3] FIG. 2 is a top view showing the arrangement of each part in the upper machine room. [Figure 4] FIG. 2 is a front view showing a configuration of a step movement sprocket provided on the passenger conveyor according to the first embodiment. [Diagram 5]FIG. 2 is a front view showing a configuration of a drive sprocket provided in the passenger conveyor according to the first embodiment. [Figure 6] FIG. 2 is a front view showing a configuration of a boss provided on the passenger conveyor according to the first embodiment. [Figure 7] 7 is a cross-sectional view of the boss shown in FIG. 6 along the line AA. [Figure 8] FIG. 2 is a front view showing a configuration of a handrail movement sprocket provided on the passenger conveyor according to the first embodiment. [Figure 9] FIG. 2 is a diagram showing a state in which a boss and a sprocket for moving a handrail are aligned in the passenger conveyor according to the first embodiment. [Figure 10] FIG. 2 is a diagram showing a state in which a boss, a sprocket for moving the handrail, and a drive sprocket are aligned in the passenger conveyor according to the first embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing an arrangement of bosses and sprockets in a passenger conveyor according to a comparative example. [Figure 12] FIG. 11 is a front view showing a configuration of a boss provided on a passenger conveyor according to a comparative example. [Figure 13] 13 is a cross-sectional view of the boss shown in FIG. 12 . [Figure 14] FIG. 11 is a front view showing a configuration of a boss provided on a passenger conveyor according to a second embodiment. [Figure 15] 15 is a cross-sectional view of the boss shown in FIG. 14 along CC line. [Figure 16] FIG. 11 is a front view showing the configuration of a drive sprocket provided in a passenger conveyor according to a second embodiment. [Figure 17] FIG. 11 is a front view showing the configuration of a handrail movement sprocket provided on a passenger conveyor according to a second embodiment. [Figure 18] FIG. 11 is a front view (part 1) showing the arrangement of each part when a drive sprocket and a handrail for moving are attached to a boss in a passenger conveyor according to a second embodiment. [Figure 19]FIG. 11 is a front view (part 2) showing the arrangement of each part when a drive sprocket and a sprocket for moving the handrail are attached to a boss in a passenger conveyor according to a second embodiment. [Figure 20] FIG. 11 is a front view (part 1) showing the arrangement of each part when the handrail moving sprocket and the drive sprocket are moved inward in the passenger conveyor according to the second embodiment. [Figure 21] FIG. 11 is a front view (part 2) showing the arrangement of each part when the handrail moving sprocket and the drive sprocket are moved inward in the passenger conveyor according to the second embodiment. [Figure 22] FIG. 11 is a front view showing the configuration of a step movement sprocket according to a third embodiment. [Figure 23] FIG. 11 is a front view (part 1) showing the arrangement of each part when a drive sprocket, a sprocket for moving along the handrail, and a sprocket for moving along the steps are attached to a boss in a passenger conveyor according to a third embodiment. [Figure 24] FIG. 13 is a front view (part 2) showing the arrangement of each part when a drive sprocket, a sprocket for moving along the handrail, and a sprocket for moving along the steps are attached to bosses in a passenger conveyor according to a third embodiment. [Diagram 25] FIG. 11 is a front view showing the arrangement of each part when the step movement sprocket is moved outward in the passenger conveyor according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In this specification and the drawings, elements having substantially the same functions or configurations are given the same reference numerals, and duplicated descriptions are omitted as appropriate. In addition, the following description and drawings are examples for explaining the present invention, and may be omitted or simplified for convenience of explanation. Each component may be singular or plural unless otherwise limited. In addition, the position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc., in order to facilitate understanding of the invention. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings.

[0010] First Embodiment [Passenger conveyor configuration] Fig. 1 is a schematic side view showing a configuration example of a passenger conveyor according to a first embodiment. Fig. 2 is a schematic plan view showing a part of the passenger conveyor shown in Fig. 1. 1 and 2, the passenger conveyor 10 is an inclined passenger conveyor, i.e., an escalator, for transporting passengers between upper and lower floors of a building structure. However, the present invention is not limited to escalators and can also be applied to, for example, moving walkways.

[0011] The passenger conveyor 10 includes a truss frame 11, a plurality of steps 12, a drive sprocket 13, a driven sprocket 14, an endless step chain 15, a balustrade 16, a handrail 17, and a skirt guard 18.

[0012] The truss frame 11 is bridged between the lower floor and the upper floor of the building structure. The truss frame 11 forms an upper machine room 11a, a lower machine room 11b, and an inclined portion 11c. The upper machine room 11a is provided at one end of the truss frame 11 in the longitudinal direction, and the lower machine room 11b is provided at the other end of the truss frame 11 in the longitudinal direction. The upper machine room 11a is provided on the upper floor of the building structure, and the lower machine room 11b is provided on the lower floor of the building structure. The inclined portion 11c is provided between the upper machine room 11a and the lower machine room 11b in a state inclined at a predetermined angle. The upper side of the upper machine room 11a is closed by the boarding and disembarking floor 20. The upper side of the lower machine room 11b is closed by the boarding and disembarking floor 21.

[0013] The steps 12 move cyclically between the upper and lower floors of the building structure. The step chain 15 is a chain for cyclically moving the steps 12. The drive sprocket 13 is disposed in the upper machine room 11a. The drive unit 22 is disposed in the upper machine room 11a. The drive unit 22 is a device that transmits a driving force from a drive source to the drive sprocket 13 via a drive chain 25 to rotate the drive sprocket 13. The drive unit 22 includes a drive motor 23 as a drive source and a reducer 24. The reducer 24 has an output sprocket 24a. The reducer 24 reduces the rotation speed of the drive motor 23 at a predetermined ratio. The output sprocket 24a rotates with a torque according to the reduction ratio of the reducer 24. A drive chain 25 is wound around the output sprocket 24a and the drive sprocket 13. The drive chain 25 transmits the rotation force of the output sprocket 24a to the drive sprocket 13.

[0014] [Layout of each part in the upper machine room] FIG. 3 is a top view showing the arrangement of each part in the upper machine room 11a. As shown in FIG. 3, in the upper machine room 11a, in addition to the above-mentioned drive sprocket 13, drive unit 22, and drive chain 25, there are arranged a drive shaft 26, two bearings 27a, 27b, two bearing holders 28a, 28b, two bosses 29a, 29b, two step movement sprockets 31a, 31b, and two handrail movement sprockets 32a, 32b.

[0015] The drive sprocket 13, the step movement sprockets 31a, 31b, and the handrail movement sprockets 32a, 32b are all formed in a disk shape. The diameter (outer diameter) of the drive sprocket 13 is larger than the diameter (outer diameter) of each of the step movement sprockets 31a, 31b. The step movement sprockets 31a, 31b have the same diameter. The step movement sprockets 31a, 31b have the same diameter. The step movement sprockets 31a, 31b have the same diameter. The step movement sprockets 32a, 32b have the same diameter. The handrail movement sprockets 32a, 32b have the same diameter.

[0016] The drive shaft 26 is disposed horizontally. The drive shaft 26 is also disposed in a direction parallel to the width direction (the vertical direction in FIG. 3) of the truss frame 11. Both ends of the drive shaft 26 each have a stepped structure.

[0017] The two bearings 27a, 27b are arranged as a pair at one end and the other end in the central axis direction of the drive shaft 26 (the vertical direction in FIG. 3). The central axis direction of the drive shaft 26 may be rephrased as the length direction of the drive shaft 26. The drive shaft 26 is rotatably supported by two (a pair of) bearings 27a, 27b. Specifically, one end 26a of the drive shaft 26 in the central axis direction is rotatably supported by the bearing 27a. The other end 26b of the drive shaft 26 in the central axis direction is rotatably supported by the bearing 27b.

[0018] Bearing 27a is attached to bearing holder 28a. Bearing holder 28a holds bearing 27a. Bearing holder 28a is fastened and fixed to truss frame 11 using bolts or the like (not shown). Bearing 27b is attached to bearing holder 28b. Bearing holder 28b holds bearing 27b. Bearing holder 28b is fastened and fixed to truss frame 11 using bolts or the like (not shown).

[0019] The boss 29a is fitted and fixed to the drive shaft 26 at one end side in the central axis direction of the drive shaft 26. The boss 29a is disposed near the bearing 27a. The boss 29b is fitted and fixed to the drive shaft 26 at the other end side in the central axis direction of the drive shaft 26. The boss 29b is disposed near the bearing 27b. The bosses 29a and 29b are fixed to the drive shaft 26 by, for example, shrink fitting. As a result, each of the bosses 29a and 29b rotates integrally with the drive shaft 26. The bosses 29a and 29b may be fixed to the drive shaft 26 by a method or structure other than shrink fitting. In the following description, in the mounting position of the boss 29a, the side approaching the intermediate portion P of the length of the drive shaft 26 may be described as the "inner side", and the side away from the intermediate portion P of the length of the drive shaft 26 may be described as the "outer side". This also applies to the mounting position of the boss 29b.

[0020] The two step movement sprockets 31a, 31b are sprockets for circulating the steps 12. The two step movement sprockets 31a, 31b are arranged in pairs at one end and the other end of the central axis direction of the drive shaft 26. The two step movement sprockets 31a, 31b are arranged on the upper floor side of the building structure. On the other hand, two step movement sprockets (not shown) are arranged on the lower floor side of the building structure. The step chains 15 (see FIG. 1) described above are arranged on both sides in the width direction of the passenger conveyor 10. One step chain 15 is wound around the step movement sprocket 31a on the upper floor side and the step movement sprocket on the lower floor side corresponding to the step movement sprocket 31a. The other step chain 15 is wound around the step movement sprocket 31b on the upper floor side and the step movement sprocket on the lower floor side corresponding to the step movement sprocket 31b. The above-mentioned driven sprocket 14 corresponds to the sprocket for moving the steps on the lower floor side.

[0021] The two handrail movement sprockets 32a, 32b are sprockets for circulating the handrail 17. The two handrail movement sprockets 32a, 32b are arranged in a pair at one end side and the other end side in the central axial direction of the drive shaft 26. Furthermore, the handrail movement sprocket 32a is arranged between the drive sprocket 13 and the step movement sprocket 31a in the central axial direction of the drive shaft 26.

[0022] The drive sprocket 13 is attached to the boss 29a. The step movement sprocket 31a is attached to the boss 29a. At the attachment position of the boss 29a, the drive sprocket 13 is disposed outside (closer to the bearing 27a) than the step movement sprocket 31a and the handrail movement sprocket 32a. The step movement sprocket 31b is attached to the boss 29b. The handrail movement sprocket 32a is attached to the boss 29a. The handrail movement sprocket 32b is attached to the boss 29b. At the attachment position of the boss 29b, the handrail movement sprocket 32b is disposed outside (closer to the bearing 27b) than the step movement sprocket 31b.

[0023] The drive sprocket 13 and the step movement sprocket 31a are fastened (co-fastened) to the boss 29a using a plurality of bolts 33 (only one is shown in FIG. 3) and a plurality of nuts 34 (only one is shown in FIG. 3). The step movement sprocket 31b is fastened to the boss 29b using a plurality of bolts 35 (only one is shown in FIG. 3) and a plurality of nuts 36 (only one is shown in FIG. 3). The handrail movement sprocket 32a is fastened to the boss 29a using a plurality of bolts 37a (only one is shown in FIG. 3). The handrail movement sprocket 32b is fastened to the boss 29b using a plurality of bolts 37b (only one is shown in FIG. 3).

[0024] The bolts 33 and 37a are disposed at different positions in the circumferential direction of the boss 29a, and the bolts 35 and 37b are disposed at different positions in the circumferential direction of the boss 29b.

[0025] [Step movement sprocket configuration] FIG. 4 is a front view showing the configuration of a step movement sprocket included in the passenger conveyor according to the first embodiment. 4, the step movement sprocket 31a and the step movement sprocket 31b basically have the same configuration, so only the configuration of the step movement sprocket 31a will be described here.

[0026] A circular mounting hole 38 is provided in the center of the step movement sprocket 31a. The mounting hole 38 is a hole for mounting the step movement sprocket 31a to the boss 29a. The mounting hole 38 is also a hole that can be fitted into the cylindrical portion 45 (see FIG. 6) of the boss 29a. The mounting hole 38 is provided in a state that penetrates the step movement sprocket 31a in the thickness direction. The inner diameter (diameter) of the mounting hole 38 is slightly larger than the outer diameter of the cylindrical portion 45 of the boss 29a. For example, the dimensional difference between the inner diameter of the mounting hole 38 and the outer diameter of the cylindrical portion 45 is preferably 0.01 mm or more and 0.2 mm or less, but other dimensions are also possible. This allows the worker to fit the mounting hole 38 of the step movement sprocket 31a into the cylindrical portion 45 of the boss 29a, and in this state rotate the step movement sprocket 31a in the circumferential direction of the boss 29a using the outer circumferential surface of the cylindrical portion 45 as a guide surface. Also, the worker can move the step movement sprocket 31a in the central axial direction of the boss 29a using the outer circumferential surface of the cylindrical portion 45 as a guide surface.

[0027] Furthermore, the step movement sprocket 31a is provided with a plurality of fixing holes 39. In FIG. 4, as an example, six fixing holes 39 are provided in the step movement sprocket 31a. The fixing holes 39 are arranged at a predetermined angular pitch (60° angular pitch in this embodiment) in the circumferential direction of the step movement sprocket 31a. The fixing holes 39 are also arranged around the mounting hole 38. Each fixing hole 39 is provided in a state in which it penetrates the step movement sprocket 31a in the thickness direction. Each fixing hole 39 is a hole for fixing the step movement sprocket 31a to the boss 29a using the above-mentioned bolt 33 and nut 34. The fixing holes 39 can be used to insert the above-mentioned bolt 33 (see FIG. 3) when attaching the step movement sprocket 31a to the boss 29a.

[0028] [Drive sprocket configuration] FIG. 5 is a front view showing the configuration of the driving sprocket 13 provided in the passenger conveyor 10 according to the first embodiment. As shown in FIG. 5, a circular mounting hole 40 is provided in the center of the driving sprocket 13. The mounting hole 40 is a hole for mounting the driving sprocket 13 to the boss 29a. The mounting hole 40 is also a hole that can be fitted into the cylindrical portion 45 (see FIG. 6) of the boss 29a. The mounting hole 40 is provided in a state of penetrating the driving sprocket 13 in the thickness direction. The inner diameter (diameter) of the mounting hole 40 is the same as the inner diameter of the mounting hole 38 in the step movement sprocket 31a described above. Therefore, when the mounting hole 40 of the driving sprocket 13 is fitted into the cylindrical portion 45 of the boss 29a, the driving sprocket 13 can be rotated with the outer circumferential surface of the cylindrical portion 45 as a guide surface. In addition, in the central axial direction of the boss 29a, the driving sprocket 13 can be moved in the central axial direction of the boss 29a with the outer circumferential surface of the cylindrical portion 45 as a guide surface.

[0029] Further, the driving sprocket 13 is provided with a plurality of fixing holes 41. In FIG. 5, as an example, six fixing holes 41 are provided in the driving sprocket 13. The fixing holes 41 are arranged at a predetermined angular pitch (an angular pitch of 60° in this embodiment) in the circumferential direction of the driving sprocket 13. The fixing holes 41 are arranged around the mounting hole 40. Each fixing hole 41 is provided in a state in which it penetrates the driving sprocket 13 in the thickness direction. Each fixing hole 41 is a hole for fixing the driving sprocket 13 to the boss 29a using the above-mentioned bolt 33 and nut 34. The inner diameter of the fixing hole 41 is the same as the inner diameter of the fixing hole 39 in the above-mentioned step movement sprocket 31a. Furthermore, the number, position and pitch circle diameter of the fixing holes 41 in the driving sprocket 13 are the same as the number, position and pitch circle diameter of the fixing holes 39 in the above-mentioned step movement sprocket 31a.

[0030] [Boss configuration] Fig. 6 is a front view showing the configuration of the boss 29a provided on the passenger conveyor 10 according to the first embodiment. Fig. 7 is a cross-sectional view taken along line AA of the boss shown in Fig. 6. 6 and 7, the boss 29a integrally has a cylindrical portion 45 and a flange portion 46. The cylindrical portion 45 is a portion into which the drive sprocket 13, the step movement sprocket 31a, and the handrail movement sprocket 32a are fitted. The cylindrical portion 45 has a first cylindrical portion 47, a second cylindrical portion 48, and a third cylindrical portion 49. The outer diameter of the cylindrical portion 45 is common to the first cylindrical portion 47, the second cylindrical portion 48, and the third cylindrical portion 49.

[0031] The first cylindrical portion 47 is a portion into which the driving sprocket 13 is fitted when the driving sprocket 13 is attached to the boss 29a. Specifically, when the driving sprocket 13 is attached to the boss 29a, the attachment hole 40 of the driving sprocket 13 is fitted to the outer periphery of the first cylindrical portion 47. The second cylindrical portion 48 is a portion into which the step movement sprocket 31a is fitted when the step movement sprocket 31a is attached to the boss 29a. Specifically, when the step movement sprocket 31a is attached to the boss 29a, the attachment hole 38 of the step movement sprocket 31a is fitted to the outer periphery of the second cylindrical portion 48. The third cylindrical portion 49 is a portion into which the handrail movement sprocket 32a is fitted when the handrail movement sprocket 32a is attached to the boss 29a. Specifically, when the handrail movement sprocket 32a is attached to the boss 29a, a plurality of fitting protrusions 61 (see FIG. 8) of the handrail movement sprocket 32a are fitted into the outer periphery of the third cylindrical portion 49.

[0032] The cylindrical portion 45 is provided with a fitting hole 50. The fitting hole 50 forms a hollow portion of the cylindrical portion 45. The fitting hole 50 is formed by the inner peripheral surface of the cylindrical portion 45. The fitting hole 50 is provided at the center of the cylindrical portion 45 when the boss 29a is viewed from the front direction. The fitting hole 50 is provided in a state in which it penetrates the boss 29a in the central axis direction. The fitting hole 50 is a hole for fitting and fixing the boss 29a to the drive shaft 26. For this reason, the inner diameter of the fitting hole 50 is set to a dimension corresponding to the outer diameter of the drive shaft 26 to which the boss 29a is fixed. For example, when the boss 29a is fixed to the drive shaft 26 by shrink fitting, the inner diameter of the fitting hole 50 is smaller than the outer diameter of the drive shaft 26 at room temperature, but when the boss 29a is heated to a predetermined temperature, the inner diameter of the fitting hole 50 becomes larger than the outer diameter of the drive shaft 26 at room temperature.

[0033] The flange portion 46 is a portion for fixing the above-mentioned drive sprocket 13, the step movement sprocket 31a, and the handrail movement sprocket 32a to the boss 29a. The flange portion 46 is formed in a state where it protrudes radially outward from the boss 29a beyond the outer circumferential surface of the cylindrical portion 45. The flange portion 46 is formed in an annular shape (donut shape) when viewed from the front direction.

[0034] The flange portion 46 has a first fixing surface 51, a second fixing surface 52, and a third fixing surface 53. The first fixing surface 51 is a surface for fixing the drive sprocket 13 to the boss 29a. The second fixing surface 52 is a surface for fixing the step movement sprocket 31a to the boss 29a. The third fixing surface 53 is a surface for fixing the handrail movement sprocket 32a to the boss 29a.

[0035] The first fixing surface 51 and the second fixing surface 52 are arranged facing in opposite directions. The first fixing surface 51 and the third fixing surface 53 are arranged facing in the same direction. Specifically, when the boss 29a is fixed to the drive shaft 26, the first fixing surface 51 and the third fixing surface 53 are arranged on the side away from the intermediate portion P of the length of the drive shaft 26, that is, facing outward. When the boss 29a is fixed to the drive shaft 26, the second fixing surface 52 is arranged on the side approaching the intermediate portion P of the length of the drive shaft 26, that is, facing inward. A predetermined step H (see FIG. 7) is provided between the first fixing surface 51 and the third fixing surface 53. The step H is a step for avoiding interference with the head of the bolt 37a shown in FIG. 3. For this reason, the step H is slightly larger than the thickness dimension of the head of the bolt 37a.

[0036] The flange portion 46 has a plurality of thick portions 46a and a plurality of thin portions 46b. The thick portions 46a are portions having a thickness dimension larger than that of the thin portions 46b. The above-mentioned predetermined step H is the difference in thickness dimension between the thick portions 46a and the thin portions 46b. The thick portions 46a form the above-mentioned first fixing surface 51 and the second fixing surface 52. The thin portions 46b form the above-mentioned third fixing surface 53. The second fixing surface 52 is formed in a flat shape over the entire circumference of the flange portion 46 so that no step occurs at the boundary between the thick portions 46a and the thin portions 46b in the circumferential direction of the boss 29a. The thick portions 46a and the thin portions 46b are alternately arranged in the circumferential direction of the boss 29a. As a result, the flange portion 46 has a stepped structure in which the thick portions 46a and the thin portions 46b are arranged next to each other in the circumferential direction of the boss 29a. In the present embodiment, for example, six thick portions 46a and six thin portions 46b are provided. In this case, the six thick portions 46a are arranged at an angular pitch of 60° in the circumferential direction of the boss 29a, and the six thin portions 46b are also arranged at an angular pitch of 60° in the circumferential direction of the boss 29a.

[0037] The flange portion 46 is provided with a plurality of sprocket fixing holes 55 and a plurality of screw holes 56. The plurality of sprocket fixing holes 55 are holes for fixing the driving sprocket 13 to the first fixing surface 51 and for fixing the step movement sprocket 31a to the second fixing surface 52. The sprocket fixing holes 55 correspond to the first fixing holes. One sprocket fixing hole 55 is provided in each of the thick portions 46a. The sprocket fixing holes 55 are provided in a state in which they penetrate the thick portions 46a. The sprocket fixing holes 55 are holes into which the above-mentioned bolts 33 (see FIG. 3) can be inserted when attaching the driving sprocket 13 and the step movement sprocket 31a to the boss 29a. The inner diameter of the sprocket fixing hole 55 in the boss 29a is the same as the inner diameter of the fixing hole 41 in the driving sprocket 13 described above. Furthermore, the number, positions and pitch circle diameter of the sprocket fixing holes 55 in the boss 29a are the same as the number, positions and pitch circle diameter of the fixing holes 41 in the drive sprocket 13 described above.

[0038] The multiple screw holes 56 are holes for fixing the handrail movement sprocket 32a to the third fixing surface 53. The screw holes 56 correspond to second fixing holes. One screw hole 56 is provided in each thin portion 46b. The screw holes 56 are provided in a state where they penetrate the thin portion 46b. The screw holes 56 are holes into which the male thread portion of the bolt 37a (see FIG. 3) described above can be screwed when attaching the handrail movement sprocket 32a to the boss 29a. Screwing refers to meshing a male thread with a female thread.

[0039] The multiple sprocket fixing holes 55 are arranged at an angular pitch of 60° in the circumferential direction of the boss 29a. The multiple screw holes 56 are arranged at an angular pitch of 60° in the circumferential direction of the boss 29a. In addition, adjacent sprocket fixing holes 55 and screw holes 56 in the circumferential direction of the boss 29a are arranged at an angular pitch of 30°. In other words, the sprocket fixing holes 55 and screw holes 56 are arranged with a phase shift of 30° in the circumferential direction of the boss 29a. The pitch circle diameter of the sprocket fixing holes 55 described above is the same as the pitch circle diameter of the screw holes 56. In addition, the number, positions, and pitch circle diameter of the screw holes 56 in the boss 29a are the same as the number, positions, and pitch circle diameter of the fixing holes 64 (see FIG. 8) in the handrail movement sprocket 32a described later.

[0040] [Handrail movement sprocket configuration] FIG. 8 is a front view showing the configuration of handrail movement sprockets 32a, 32b provided on the passenger conveyor according to the first embodiment. 8, the handrail-movement sprocket 32a and the handrail-movement sprocket 32b basically have the same configuration, so only the configuration of the handrail-movement sprocket 32a will be described here.

[0041] As shown in Fig. 8, the sprocket 32a for moving on the handrail has a plurality of fitting protrusions 61 and a plurality of relief portions 62. The plurality of fitting protrusions 61 are formed integrally with the sprocket 32a for moving on the handrail. The plurality of fitting protrusions 61 are formed in a state of protruding from the outer periphery side of the sprocket 32a for moving on the handrail toward the inner periphery side (the center of the sprocket 32a for moving on the handrail).

[0042] Further, the handrail moving sprocket 32a is provided with a plurality of fixing holes 64. The fixing holes 64 are holes for fixing the handrail moving sprocket 32a to the boss 29a. Specifically, the fixing holes 64 are holes for fixing the fitting protrusions 61 of the handrail moving sprocket 32a to the flange portion 46 of the boss 29a. For this reason, one fixing hole 64 is provided for each fitting protrusion 61. The plurality of fixing holes 64 (six in this embodiment) are arranged around the imaginary circle 63. Each fixing hole 64 is provided in a state penetrating the fitting protrusions 61 of the handrail moving sprocket 32a in the thickness direction. The inner diameter (diameter) of the fixing holes 64 is such that the bolts 37a (see FIG. 3) can be inserted therein. The fixing holes 64 are provided at the same angular pitch as the fitting protrusions 61. The number, positions and pitch circle diameter of the fixing holes 64 in the handrail movement sprocket 32a are the same as the number, positions and pitch circle diameter of the screw holes 56 in the boss 29a described above.

[0043] The protruding end faces 61a of the multiple fitting protrusions 61 are formed by curving in an arc shape along an imaginary circle 63. The protruding end faces 61a of the fitting protrusions 61 are end faces located radially inside the handrail movement sprocket 32a, so they may be referred to as inner end faces of the fitting protrusions. The imaginary circle 63 is a circle (a perfect circle) having a common center with the handrail movement sprocket 32a. The diameter of the imaginary circle 63 is the same as the diameter of the mounting hole 40 of the drive sprocket 13 described above. The outer diameter of the cylindrical portion 45 of the boss 29a described above is slightly smaller than the diameter of the imaginary circle 63. For example, the dimensional difference between the diameter of the imaginary circle 63 and the outer diameter of the cylindrical portion 45 is preferably 0.01 mm or more and 0.2 mm or less, but other dimensions are also possible. The diameter of the imaginary circle 63 is equal to the distance between the protruding end faces 61a of the two fitting protrusions 61 facing each other on an imaginary center line passing through the center of the handrail movement sprocket 32a.

[0044] This allows the worker to fit the multiple fitting protrusions 61 into the cylindrical portion 45 of the boss 29a, and in this state, rotate the handrail movement sprocket 32a in the circumferential direction of the boss 29a, using the outer circumferential surface of the cylindrical portion 45 as a guide surface. Also, the worker can move the handrail movement sprocket 32a in the central axial direction of the boss 29a, using the outer circumferential surface of the cylindrical portion 45 as a guide surface.

[0045] The multiple recesses 62 are formed to avoid interference with the multiple thick portions 46a of the boss 29a described above. The multiple recesses 62 are formed radially outward of the imaginary circle 63. The multiple recesses 62 are formed in a petal shape. Each recess 62 communicates with the space surrounded by the imaginary circle 63. Communication means spatial connection. Each recess 62 is formed by hollowing out a part of the handrail movement sprocket 32a. The recessed area of ​​the recess 62 outside the imaginary circle 63 is secured to be larger than the area of ​​the thick portions 46a of the boss 29a described above.

[0046] [Sprocket installation procedure] Here, a procedure for attaching the drive sprocket 13, the step movement sprocket 31a, and the handrail movement sprocket 32a to the boss 29a will be described.

[0047] First, the worker attaches the handrail transfer sprocket 32a to the boss 29a. Specifically, the worker fits the end faces 61a of the fitting protrusions 61 of the handrail transfer sprocket 32a to the outer periphery of the first cylindrical portion 47 of the boss 29a. The worker also aligns the fitting protrusions 61 of the handrail transfer sprocket 32a with the corresponding thin-walled portions 46b by appropriately rotating the handrail transfer sprocket 32a, as shown in FIG. 9. This makes it possible to move the handrail transfer sprocket 32a in the central axial direction of the boss 29a while avoiding interference between the fitting protrusions 61 of the handrail transfer sprocket 32a and the thick-walled portion 46a of the boss 29a.

[0048] Next, while placing the thick portion 46a of the boss 29a in the space of the relief portion 62 of the sprocket 32a for moving on the handrail, the worker moves the sprocket 32a for moving on the handrail from the first cylindrical portion 47 to the third cylindrical portion 49, thereby pressing the fitting protrusion 61 of the sprocket 32a for moving on the handrail against the third fixed surface 53 of the flange portion 46. In this state, the worker aligns the boss 29a and the sprocket 32a for moving on the handrail so that the screw hole 56 of the boss 29a and the fixing hole 64 of the sprocket 32a for moving on the handrail are concentrically overlapping (placed in the same position) as shown in Fig. 9.

[0049] Next, the worker inserts the male threaded portion of the bolt 37a into the screw hole 56 of the boss 29a through the fixing hole 64 of the handrail movement sprocket 32a. At this time, the worker installs a total of six bolts 37a. After that, the worker tightens each bolt 37a with a predetermined torque using a tool such as a wrench. At this time, the tightening force of the bolt 37a acts to press and fix the fitting protrusion 61 of the handrail movement sprocket 32a against the third fixing surface 53 of the boss 29a. As a result, the handrail movement sprocket 32a is fixed to the third fixing surface 53 of the boss 29a by the tightening force of the bolt 37a. This completes the installation of the handrail movement sprocket 32a to the boss 29a.

[0050] Next, the worker attaches the drive sprocket 13 to the boss 29a. Specifically, the worker fits the mounting hole 40 of the drive sprocket 13 into the outer periphery of the first cylindrical portion 47 of the boss 29a. The worker also presses the drive sprocket 13 against the first fixing surface 51 of the flange portion 46 of the boss 29a. In this state, the worker aligns the boss 29a and the drive sprocket 13 so that the sprocket fixing hole 55 of the boss 29a and the fixing hole 41 of the drive sprocket 13 are concentrically overlapped (located at the same position) as shown in FIG. 10. At this time, interference between the head of the bolt 37a and the drive sprocket 13 is avoided by the dimensional difference between the thick portion 46a and the thin portion 46b, i.e., the step H.

[0051] The worker also attaches the step movement sprocket 31a to the boss 29a. Specifically, the worker fits the attachment hole 38 of the step movement sprocket 31a into the outer periphery of the second cylindrical portion 48 of the boss 29a. The worker also presses the step movement sprocket 31a against the second fixing surface 52 of the flange portion 46 of the boss 29a. In this state, the worker aligns the boss 29a and the step movement sprocket 31a so that the sprocket fixing hole 55 of the boss 29a and the fixing hole 39 of the step movement sprocket 31a are concentrically overlapping (placed in the same position).

[0052] Next, the worker attaches six bolts 33. Specifically, the worker inserts the bolts 33 from the drive sprocket 13 side. At this time, the shafts (including the male thread portions) of the bolts 33 pass through the fixing holes 41 of the drive sprocket 13, the sprocket fixing holes 55 of the boss 29a, and the fixing holes 39 of the step movement sprocket 31a, and protrude toward the step movement sprocket 31a side.

[0053] Next, the worker attaches the six bolts 33 by engaging the nuts 34 with each other. The worker also tightens each nut 34 to a predetermined torque using a tool such as a wrench. As a result, the drive sprocket 13 and the step movement sprocket 31a are fastened and fixed to the flange portion 46 (thick portion 46a) of the boss 29a by the multiple bolts 33 and multiple nuts 34. At this time, the drive sprocket 13 is fixed to the first fixing surface 51 of the boss 29a by the fastening force of the bolts 33 and the nuts 34. The step movement sprocket 31a is fixed to the second fixing surface 52 of the boss 29a by the fastening force of the bolts 33 and the nuts 34.

[0054] After mounting the drive sprocket 13, the step movement sprocket 31a, and the handrail movement sprocket 32a to the boss 29a in this manner, the worker mounts the boss 29a to the drive shaft 26 by shrink fitting or the like.

[0055] The boss 29b has a structure basically similar to that of the boss 29a described above. The mounting structure and method of the step movement sprocket 31b to the boss 29b are basically similar to the mounting structure and method of the step movement sprocket 31a to the boss 29a. The mounting structure and method of the step movement sprocket 31b to the boss 29b are basically similar to the mounting structure and method of the step movement sprocket 31a to the boss 29a. However, while the drive sprocket 13 is attached to the boss 29a, the drive sprocket 13 is not attached to the boss 29b.

[0056] Thereafter, the worker attaches bearing 27a held in bearing holder 28a to one end 26a of drive shaft 26. In addition, the worker attaches bearing 27b held in bearing holder 28b to the other end 26b of drive shaft 26. Thereafter, while maintaining drive shaft 26 horizontally along the width direction of truss frame 11, the worker fixes bearing holders 28a and 28b to predetermined locations of truss frame 11 with bolts or the like.

[0057] <Comparative form> FIG. 11 is a cross-sectional view showing an arrangement of bosses and sprockets in a passenger conveyor according to a comparative example. As shown in Fig. 11, a driving sprocket 1001, a step movement sprocket 1002, and a handrail movement sprocket 1003 are attached to a boss 1000. The driving sprocket 1001, the step movement sprocket 1002, and the handrail movement sprocket 1003 are all formed in a disk shape. The driving sprocket 1001 and the step movement sprocket 1002 are fastened and fixed to a flange portion 1009 of the boss 1000 by using a plurality of bolts 1005 (only one is shown in Fig. 11) and a plurality of nuts 1006 (only one is shown in Fig. 11). The handrail movement sprocket 1003 is fastened and fixed to the flange portion 1009 of the boss 1000 by using a plurality of bolts 107 (only one is shown in Fig. 11).

[0058] [Boss configuration] Fig. 12 is a front view showing the configuration of a boss provided on a passenger conveyor according to a comparative example, and Fig. 13 is a BB cross-sectional view of the boss shown in Fig. 12. 12 and 13, the boss 1000 integrally has a cylindrical portion 1008 and a flange portion 1009. The boss 1000 is provided with a fitting hole 1010. The fitting hole 1010 is a hole for fitting and fixing the boss 1000 to the drive shaft 26.

[0059] The flange portion 1009 is formed in a state of protruding radially outward from the boss 1000 beyond the outer circumferential surface of the cylindrical portion 1008. The flange portion 1009 has a first annular portion 1009a and a second annular portion 1009b. That is, the flange portion 1009 is composed of two annular portions (1009a, 1009b). The thickness dimension of the first annular portion 1009a is larger than the thickness dimension of the second annular portion 1009b. The outer diameter of the first annular portion 1009a is larger than the outer diameter of the cylindrical portion 1008. The outer diameter of the second annular portion 1009b is larger than the outer diameter of the first annular portion 1009a. As a result, the flange portion 1009 has a stepped structure having a step at the boundary between the first annular portion 1009a and the second annular portion 1009b.

[0060] The first annular portion 1009a is provided with a plurality of first sprocket fixing holes 1011. The first sprocket fixing holes 1011 are holes for fastening the drive sprocket 1001 and the step movement sprocket 1002 together to the first annular portion 1009a of the boss 1000 using bolts 1005 and nuts 1006.

[0061] The second annular portion 1009b is provided with a plurality of second sprocket fixing holes 1012. The second sprocket fixing holes 1012 are screw holes for fastening and fixing the handrail movement sprocket 1003 to the second annular portion 1009b of the boss 1000 using bolts 1007. The pitch circle diameter of the plurality of second sprocket fixing holes 1012 is larger than the pitch circle diameter of the plurality of first sprocket fixing holes 1011. For this reason, in the passenger conveyor according to the comparative embodiment, it is necessary to ensure a large outer diameter of the entire boss 1000 including the flange portion 1009 having the first annular portion 1009a and the second annular portion 1009b.

[0062] In contrast, in the passenger conveyor 10 according to the first embodiment, the flange portion 46 of the boss 29a is formed of one annular portion, and the annular portion is provided with a plurality of thick portions 46a and a plurality of thin portions 46b. Each of the plurality of thick portions 46a is provided with a sprocket fixing hole 55 for fixing the drive sprocket 13 to the first fixing surface 51 and for fixing the step movement sprocket 31a to the second fixing surface 52. Meanwhile, each of the plurality of thin portions 46b is provided with a screw hole 56 for fixing the handrail movement sprocket 32a to the third fixing surface 53. This allows the pitch circle diameter of the sprocket fixing hole 55 to match the pitch circle diameter of the screw hole 56. Therefore, the boss 29a can be made smaller than the comparative embodiment described above. As a result, it is possible to reduce the material used to manufacture the boss 29a, and to realize economical and environmentally friendly reduction.

[0063] As an application example of the first embodiment, the boss 29b can be made smaller by making the boss 29b have the same configuration as the boss 29a.

[0064] To reduce the size of the boss 29a, it is preferable that the pitch circle diameter of the sprocket fixing hole 55 is the same as the pitch circle diameter of the screw hole 56. However, the pitch circle diameter of the sprocket fixing hole 55 and the pitch circle diameter of the screw hole 56 do not have to be exactly the same as long as the outer diameter of the flange portion 46 shown in Figure 6 is not enlarged. The same applies to the pitch circle diameter of the sprocket fixing hole 550 and the pitch circle diameter of the screw hole 560, which will be described later.

[0065] <Second embodiment> Next, a passenger conveyor according to a second embodiment will be described. The passenger conveyor according to the second embodiment is different from the passenger conveyor according to the above-mentioned first embodiment in the configurations of the boss, the drive sprocket, and the handrail movement sprocket.

[0066] [Boss configuration] Fig. 14 is a front view showing the configuration of a boss 290a provided on the passenger conveyor according to the second embodiment. Fig. 15 is a CC cross-sectional view of the boss shown in Fig. 14. A boss 290a shown in FIGS. 14 and 15 is fitted and fixed to the drive shaft 26 in place of the boss 29a shown in FIGS.

[0067] The boss 290a integrally has a cylindrical portion 450 and a plurality of flange portions 460. The cylindrical portion 450 is a portion into which the drive sprocket 130 (see FIG. 16), the step movement sprocket 31a (see FIG. 4), and the handrail movement sprocket 320a (see FIG. 17) are fitted. The cylindrical portion 450 has a first cylindrical portion 470, a second cylindrical portion 480, and a third cylindrical portion 490. The outer diameter of the cylindrical portion 450 is common to the first cylindrical portion 470, the second cylindrical portion 480, and the third cylindrical portion 490.

[0068] The first cylindrical portion 470 is a portion into which the driving sprocket 130 is fitted when the driving sprocket 130 is attached to the boss 290a. Specifically, when the driving sprocket 130 is attached to the boss 290a, the multiple fitting protrusions 101 of the driving sprocket 130 are fitted to the outer periphery of the first cylindrical portion 470. The second cylindrical portion 480 is a portion into which the step movement sprocket 31a is fitted when the step movement sprocket 31a is attached to the boss 290a. Specifically, when the step movement sprocket 31a is attached to the boss 290a, the mounting hole 38 of the step movement sprocket 31a is fitted to the outer periphery of the second cylindrical portion 480. The third cylindrical portion 490 is a portion into which the handrail movement sprocket 320a is fitted when the handrail movement sprocket 320a is attached to the boss 290a. Specifically, when the handrail movement sprocket 320a is attached to the boss 290a, the multiple fitting protrusions 201 of the handrail movement sprocket 320a are fitted into the outer periphery of the third cylindrical portion 490.

[0069] The cylindrical portion 450 is provided with a fitting hole 500. The fitting hole 500 forms a hollow portion of the cylindrical portion 450. The fitting hole 500 is formed by the inner peripheral surface of the cylindrical portion 450. The fitting hole 500 is provided at the center of the cylindrical portion 450 when the boss 290a is viewed from the front direction. The fitting hole 500 is provided in a state in which it penetrates the boss 290a in the central axis direction. The fitting hole 500 is a hole for fitting and fixing the boss 290a to the drive shaft 26. For this reason, the inner diameter of the fitting hole 500 is set to a dimension corresponding to the outer diameter of the drive shaft 260 to which the boss 290a is fixed. For example, when boss 290a is fixed to drive shaft 26 by shrink fitting, at room temperature, the inner diameter of fitting hole 500 is smaller than the outer diameter of drive shaft 26, but when boss 290a is heated to a predetermined temperature, the inner diameter of fitting hole 500 becomes larger than the outer diameter of drive shaft 26 at room temperature.

[0070] The flanges 460 are portions for fixing the drive sprocket 130 (described later), the step movement sprocket 31a (see FIG. 4), and the handrail movement sprocket 320a (described later). The flanges 460 are formed radially in a state of protruding radially outward from the boss 290a beyond the outer circumferential surface of the cylindrical portion 450. If the flanges of the boss 290a are annular (donut-shaped) when viewed from the front, the flanges 460 are formed by removing unnecessary portions of the annular flanges. The flanges 460 are divided into a plurality of portions in the circumferential direction of the boss 290a. The flanges 460 are arranged at a predetermined angular pitch in the circumferential direction of the boss 290a. In this embodiment, as an example, six flanges 460 are provided on the boss 290a. In this case, the six flanges 460 are arranged at an angular pitch of 60° in the circumferential direction of the boss 290a.

[0071] Each flange portion 460 is formed in a substantially trapezoidal shape when the boss 290a is viewed from the front. Each flange portion 460 has a thick portion 460a and a thin portion 460b. In other words, one flange portion 460 is composed of one thick portion 460a and one thin portion 460b.

[0072] The thick portion 460a is a portion having a thickness dimension larger than that of the thin portion 460b. Each flange portion 460 has a stepped structure in which the thick portion 460a and the thin portion 460b are arranged next to each other in the circumferential direction of the boss 290a. In this embodiment, as an example, the boss 290a has six flange portions 460. In this case, the six flange portions 460 are arranged at an angular pitch of 60° in the circumferential direction of the boss 290a. The six thick portions 460a are arranged at an angular pitch of 60° in the circumferential direction of the boss 290a, and the six thin portions 460b are arranged at an angular pitch of 60° in the circumferential direction of the boss 290a. The step Ha, which is the difference in thickness between the thick portion 460a and the thin portion 460b, is a step to avoid interference with the head of the bolt 37a shown in FIG. 3. For this reason, the step Ha is slightly larger than the thickness dimension of the head of the bolt 37a.

[0073] The thick portion 460a forms a first fixing surface 510 and a second fixing surface 520. The thin portion 460b forms a third fixing surface 530. The first fixing surface 510 is a surface for fixing the drive sprocket 130 to the boss 290a. The second fixing surface 520 is a surface for fixing the handrail movement sprocket 32a to the boss 290a. The third fixing surface 530 is a surface for fixing the handrail movement sprocket 320a to the boss 290a. The second fixing surface 520 is formed in a flat shape so that no step is generated at the boundary between the thick portion 460a and the thin portion 460b.

[0074] First fixed surface 510 and second fixed surface 520 are arranged facing in opposite directions, and first fixed surface 510 and third fixed surface 530 are arranged facing in the same direction. This is similar to the case of first fixed surface 51, second fixed surface 52, and third fixed surface 53 shown in FIG. 7 above.

[0075] Each flange portion 460 is provided with a sprocket fixing hole 550 and a screw hole 560. The sprocket fixing hole 550 is a hole for fixing the driving sprocket 130 to the first fixing surface 510 and for fixing the step movement sprocket 31a to the second fixing surface 520. The sprocket fixing hole 550 corresponds to the first fixing hole. One sprocket fixing hole 550 is provided in each thick portion 460a. The sprocket fixing hole 550 is provided in a state penetrating the thick portion 460a. The sprocket fixing hole 550 is a hole into which the above-mentioned bolt 33 (see FIG. 3) can be inserted when attaching the driving sprocket 130 and the step movement sprocket 31a to the boss 290a.

[0076] The multiple screw holes 560 are holes for fixing the handrail movement sprocket 320a to the third fixing surface 530. The screw holes 560 correspond to second fixing holes. One screw hole 560 is provided in each thin portion 460b. The screw holes 560 are provided in a state where they penetrate the thin portion 460b. The screw holes 560 are holes into which the male thread portion of the above-mentioned bolt 37a (see FIG. 3) can be screwed when attaching the handrail movement sprocket 320a to the boss 290a.

[0077] The sprocket fixing holes 550 are arranged at an angular pitch of 60° around the circumference of the boss 290a. The screw holes 560 are arranged at an angular pitch of 60° around the circumference of the boss 290a. The pitch circle diameter of the sprocket fixing holes 550 is the same as the pitch circle diameter of the screw holes 560.

[0078] [Drive sprocket configuration] FIG. 16 is a front view showing the configuration of a drive sprocket 130 provided in the passenger conveyor according to the second embodiment. A drive sprocket 130 shown in FIG. 16 is a sprocket that is attached to the boss 290a described above in place of the drive sprocket 13 described above. As shown in Fig. 16, the drive sprocket 130 has a plurality of fitting protrusions 101 and a plurality of recesses 102. The multiple fitting protrusions 101 are formed integrally with the drive sprocket 130. The multiple fitting protrusions 101 are formed in a state in which they protrude from the outer periphery side of the drive sprocket 130 toward the inner periphery side (the center of the drive sprocket 130). The fitting protrusions 101 correspond to first fitting protrusions.

[0079] The protruding end faces 101a of the multiple fitting protrusions 101 are formed to be curved in an arc shape along the imaginary circle 103. The protruding end faces 101a of the fitting protrusions 101 are end faces located radially inside the driving sprocket 130, so they may be referred to as the inner end faces of the fitting protrusions 101. The imaginary circle 103 is a circle (a perfect circle) having a common center with the driving sprocket 130. The outer diameter of the cylindrical portion 450 of the boss 290a described above is slightly smaller than the diameter of the imaginary circle 103. For example, the dimensional difference between the diameter of the imaginary circle 103 and the outer diameter of the cylindrical portion 450 is preferably 0.01 mm or more and 0.2 mm or less, but may be other dimensions. The diameter of the imaginary circle 103 is equal to the distance between the protruding end faces 101a of the two fitting protrusions 101 facing each other on the imaginary center line passing through the center of the driving sprocket 130.

[0080] As a result, when the multiple fitting protrusions 101 are fitted into the cylindrical portion 450 (first cylindrical portion 470) of the boss 290a, a small gap is formed between the outer circumferential surface of the cylindrical portion 450 and the tip end surface 101a of each fitting protrusion 101. Therefore, the worker can rotate the drive sprocket 130 in the circumferential direction of the boss 290a using the outer circumferential surface of the cylindrical portion 450 of the boss 290a as a guide surface. In addition, the worker can move the drive sprocket 130 in the central axis direction of the boss 290a using the outer circumferential surface of the cylindrical portion 450 as a guide surface.

[0081] In this embodiment, as an example, six fitting protrusions 101 and six recesses 102 are provided in the circumferential direction of the drive sprocket 130. In this case, the six fitting protrusions 101 are arranged at an angular pitch of 60° in the circumferential direction of the drive sprocket 130. In the circumferential direction of the drive sprocket 130, the fitting protrusions 101 and the recesses 102 are arranged alternately so as to be adjacent to each other. Therefore, the multiple (six in the illustrated example) recesses 102 are arranged at the same angular pitch as the multiple fitting protrusions 101.

[0082] Further, the driving sprocket 130 is provided with a plurality of fixing holes 104. The fixing holes 104 are holes for fixing the driving sprocket 130 to the boss 290a. Specifically, the fixing holes 104 are holes for fixing the fitting protrusion 101 of the driving sprocket 130 to the boss 290a. For this reason, one fixing hole 104 is provided for each fitting protrusion 101. The fixing holes 104 (six in this embodiment) are arranged around the imaginary circle 103. Each fixing hole 104 is provided in a state penetrating the fitting protrusion 101 of the driving sprocket 130 in the thickness direction. The inner diameter (diameter) of the fixing holes 104 of the driving sprocket 130 is the same as that of the fixing holes 39 of the step movement sprocket 31a described above. Furthermore, the fixing holes 104 are provided at the same angular pitch as the fitting protrusions 101. The number, positions and pitch circle diameter of the fixing holes 104 in the drive sprocket 130 are the same as the number, positions and pitch circle diameter of the fixing holes 39 in the step movement sprocket 31a described above.

[0083] The plurality of recesses 102 are formed to avoid interference with the plurality of flange portions 460 of the boss 290a described above. The recesses 102 correspond to first recesses. The plurality of recesses 102 are formed radially outward of the imaginary circle 103. The plurality of recesses 102 are formed in a petal shape. Each of the recesses 102 communicates with a space surrounded by the imaginary circle 103. Each of the recesses 102 is formed by removing a part of the drive sprocket 130. The recessed area of ​​the recesses 102 outside the imaginary circle 103 is secured to be larger than the area of ​​the flange portion 460 of the boss 29a described above.

[0084] [Handrail movement sprocket configuration] FIG. 17 is a front view showing the configuration of a handrail movement sprocket 320a provided on the passenger conveyor according to the second embodiment. A handrail moving sprocket 320a shown in FIG. 17 is a sprocket that is attached to the boss 290a described above, in place of the handrail moving sprocket 32a described above. As shown in Fig. 17, the sprocket 320a for moving on the handrail has a plurality of fitting protrusions 201 and a plurality of recesses 202. The plurality of fitting protrusions 201 are formed integrally with the sprocket 320a for moving on the handrail. The plurality of fitting protrusions 201 are formed so as to protrude from the outer periphery side of the sprocket 320a for moving on the handrail toward the inner periphery side (the center of the sprocket 320a for moving on the handrail). The fitting protrusions 201 correspond to second fitting protrusions.

[0085] The protruding end faces 201a of the multiple fitting protrusions 201 are curved in an arc shape along the imaginary circle 203. The protruding end faces 201a of the fitting protrusions 201 are end faces located radially inside the handrail movement sprocket 320a, so they may be referred to as the inner end faces of the fitting protrusions 201. The imaginary circle 203 is a circle (a perfect circle) having a common center with the handrail movement sprocket 320a. The outer diameter of the cylindrical portion 450 of the boss 290a described above is slightly smaller than the diameter of the imaginary circle 203. For example, the dimensional difference between the diameter of the imaginary circle 203 and the outer diameter of the cylindrical portion 450 is preferably 0.01 mm or more and 0.2 mm or less, but other dimensions are also possible. The diameter of the imaginary circle 203 is equal to the distance between the protruding end faces 201a of the two fitting protrusions 201 facing each other on the imaginary center line passing through the center of the handrail movement sprocket 320a.

[0086] As a result, when the multiple fitting protrusions 201 are fitted into the cylindrical portion 450 (third cylindrical portion 490) of the boss 290a, a small gap is formed between the outer circumferential surface of the cylindrical portion 450 and the tip surface 201a of each fitting protrusion 201. Therefore, the worker can rotate the handrail movement sprocket 320a in the circumferential direction of the boss 290a using the outer circumferential surface of the cylindrical portion 450 of the boss 290a as a guide surface. In addition, the worker can move the handrail movement sprocket 320a in the central axis direction of the boss 290a using the outer circumferential surface of the cylindrical portion 450 as a guide surface.

[0087] In this embodiment, as an example, six fitting protrusions 201 and six recesses 202 are provided in the circumferential direction of the handrail movement sprocket 320a. In this case, the six fitting protrusions 201 are arranged at an angular pitch of 60° in the circumferential direction of the handrail movement sprocket 320a. In the circumferential direction of the handrail movement sprocket 320a, the fitting protrusions 201 and the recesses 202 are arranged alternately so as to be adjacent to each other. Therefore, the multiple (six in the illustrated example) recesses 202 are arranged at the same angular pitch as the multiple fitting protrusions 201.

[0088] Further, the handrail moving sprocket 320a is provided with a plurality of fixing holes 204. The plurality of fixing holes 204 are holes for fixing the handrail moving sprocket 320a to the boss 290a. Specifically, the fixing holes 204 are holes for fixing the fitting protrusion 201 of the handrail moving sprocket 320a to the boss 290a. For this reason, one fixing hole 204 is provided for each fitting protrusion 201. The plurality of fixing holes 204 (six in this embodiment) are arranged around the imaginary circle 203. Each fixing hole 204 is provided in a state penetrating the fitting protrusion 201 of the handrail moving sprocket 320a in the thickness direction. The inner diameter (diameter) of the fixing hole 204 of the handrail moving sprocket 320a is the same as that of the fixing hole 39 of the step moving sprocket 31a described above. In addition, the fixing holes 204 are provided at the same angular pitch as the fitting protrusions 201. The number, positions and pitch circle diameter of the fixing holes 204 in the handrail movement sprocket 320a are the same as the number, positions and pitch circle diameter of the fixing holes 39 in the step movement sprocket 31a described above.

[0089] The multiple clearances 202 are formed to avoid interference with the multiple flange portions 460 of the boss 290a described above. The clearances 202 correspond to second clearances. The multiple clearances 202 are formed radially outward of the imaginary circle 203. The multiple clearances 202 are formed in a petal shape. Each clearance 202 communicates with a space surrounded by the imaginary circle 203. Each clearance 202 is formed by removing a portion of the handrail movement sprocket 320a. The recessed area of ​​the clearance 202 outside the imaginary circle 203 is secured to be larger than the area of ​​the flange portion 460 of the boss 29a described above.

[0090] FIG. 18 is a front view (part 1) showing the arrangement of each part when the driving sprocket 130 and the sprocket 320a for moving on the handrail are attached to the boss 290a in the passenger conveyor according to the second embodiment. Also, FIG. 19 is a front view (part 2) showing the arrangement of each part when the driving sprocket 130 and the sprocket 320a for moving on the handrail are attached to the boss 290a in the passenger conveyor according to the second embodiment. In FIG. 18, the shapes of each sprocket (130, 320a) are all shown by solid lines, regardless of the positional relationship between the driving sprocket 130 and the sprocket 320a for moving on the handrail in the depth direction of the paper. Also, in FIG. 19, a part of the driving sprocket 130 and a part of the sprocket 320a for moving on the handrail are omitted at the break line 150.

[0091] As shown in FIGS. 18 and 19, the handrail movement sprocket 320a and the drive sprocket 130 are aligned with respect to the boss 290a having a plurality of flange portions 460 as follows.

[0092] The handrail movement sprocket 320a is aligned with the boss 290a such that the end faces 201a (see FIG. 17) of the multiple fitting protrusions 201 are fitted into the outer periphery of the cylindrical portion 450 (third cylindrical portion 490) of the boss 290a, and in this state the screw holes 560 of the flange portion 460 and the fixing holes 204 of the fitting protrusions 201 are concentrically overlapped (placed at the same position). The handrail movement sprocket 320a is also aligned with the boss 290a such that the end sides of the multiple fitting protrusions 201 are overlapped with the corresponding thin-walled portions 460b (see FIG. 14) of the flange portion 460.

[0093] The drive sprocket 130 is aligned with the boss 290a such that the end faces 101a (see FIG. 16) of the multiple fitting protrusions 101 are fitted into the cylindrical portion 450 (first cylindrical portion 470) of the boss 290a and, in this state, the sprocket fixing holes 550 of the flange portion 460 and the fixing holes 104 of the fitting protrusions 101 are concentrically overlapping (located at the same position). The drive sprocket 130 is also aligned with the boss 290a such that the end sides of the multiple fitting protrusions 101 are overlapping the corresponding thick portions 460a (see FIG. 14) of the flange portion 460.

[0094] 18, the fitting protrusion 201 of the handrail movement sprocket 320a and the fitting protrusion 101 of the drive sprocket 130 are arranged adjacent to each other across the center line of one flange portion 460. The center line of one flange portion 460 corresponds to the boundary line between the thick portion 460a and the thin portion 460b that form one flange portion 460, as shown in FIG.

[0095] In the passenger conveyor according to the second embodiment, in a state where the handrail movement sprocket 320a is aligned with the boss 290a as described above, the handrail movement sprocket 320a is fastened and fixed to the boss 290a using a plurality of bolts 37a. Also, in the passenger conveyor according to the second embodiment, in a state where the drive sprocket 130 is aligned with the boss 290a as described above, the drive sprocket 130 is fastened and fixed to the boss 290a together with the step movement sprocket 31a using a plurality of bolts 33 and a plurality of nuts 34. Also, the drive sprocket 130 is fixed to the first fixing surface 51 of the boss 290a by the fastening force of the bolts 33 and the nuts 34. The step movement sprocket 31a is fixed to the second fixing surface 520 of the boss 290a by the tightening force of the bolt 33 and the nut 34, and the handrail movement sprocket 320a is fixed to the third fixing surface 530 of the boss 290a by the tightening force of the bolt 37a.

[0096] In addition, in the passenger conveyor according to the second embodiment, after the handrail movement sprocket 320a, the drive sprocket 130, and the step movement sprocket 31a are attached to the boss 290a as described above, an operator can perform a predetermined operation to move each sprocket (31a, 320a, 130) inward. The "inward" described here refers to the side approaching the intermediate portion P of the length of the drive shaft 26. The predetermined operation is performed, for example, to replace the bearings 27a, 27b. The procedure of the predetermined operation will be described below.

[0097] First, the worker removes the bolts 33 and nuts 34, and then moves the step movement sprocket 31a inward (toward the middle part P in the length direction of the drive shaft 26). Next, the worker moves the drive sprocket 13 outward (in the direction away from the middle part P in the length direction of the drive shaft 26) a predetermined amount, and in that state removes the bolts 37a. The predetermined amount is an amount that does not interfere with removal of the bolts 37a.

[0098] Next, the worker appropriately rotates the sprocket 320a for moving the handrail and the driving sprocket 130, respectively, to align the sprocket 320a for moving the handrail and the driving sprocket 130, as shown in Figs. 20 and 21. Fig. 20 is a front view (part 1) showing the arrangement of each part when the sprocket 320a for moving the handrail and the driving sprocket 130 are moved inward in the passenger conveyor according to the second embodiment. Fig. 21 is a front view (part 2) showing the arrangement of each part when the sprocket 320a for moving the handrail and the driving sprocket 130 are moved inward in the passenger conveyor according to the second embodiment. In Fig. 21, a part of the driving sprocket 130 and a part of the sprocket 320a for moving the handrail are omitted at the boundary of the break line 151.

[0099] As shown in Figures 20 and 21, by aligning the handrail movement sprocket 320a and the drive sprocket 130, the fitting protrusions 201 of the handrail movement sprocket 320a and the fitting protrusions 101 of the drive sprocket 130 are arranged so as to substantially overlap in the circumferential direction of the respective sprockets (320a, 130). Also, the recesses 202 of the handrail movement sprocket 320a and the recesses 102 of the drive sprocket 130 are arranged so as to substantially overlap in the circumferential direction of the respective sprockets (320a, 130). Also, the flange portion 460 of the boss 290a is arranged within the space formed by the recesses 102, 202 which substantially overlap in the circumferential direction of the sprockets (320a, 130) as described above. This allows the handrail movement sprocket 320a and the drive sprocket 130 to move inward of the flange portion 460 (toward the middle portion P of the drive shaft 26 in the longitudinal direction) while avoiding interference with the flange portion 460.

[0100] Therefore, the worker can move inward not only the step movement sprocket 31a, but also the handrail movement sprocket 320a and the drive sprocket 130. Next, the worker rotates the drive shaft 26 in the R direction (see FIG. 3) within the horizontal plane, with the vicinity of the middle part P of the drive shaft 26 in the longitudinal direction as the rotation center.

[0101] Here, when replacing the bearings 27a, 27b, the worker must remove the bolts or the like that fix the bearing holders 28a, 28b to the truss frame 11, and then rotate the drive shaft 26 in the R direction (see FIG. 3) in a horizontal plane around the center P of the drive shaft 26 in the longitudinal direction. In this case, if the diameter of the drive sprocket 130 is made large, the drive sprocket 130 is likely to interfere with the truss frame 11 when the worker rotates the drive shaft 26 in the horizontal plane. The truss frame 11 is an example of a peripheral part with which the drive sprocket 130 is likely to interfere. In addition, if the diameter of the drive sprocket 130 becomes larger than a predetermined value, the worker will not be able to rotate the drive shaft 26 in the horizontal plane due to the interference between the drive sprocket 130 and the truss frame 11.

[0102] In the second embodiment, a plurality of flanges 460 are provided in a divided state on the outer periphery of the boss 290a. A plurality of clearances 102 are provided on the driving sprocket 130 to avoid interference with the flanges 460 of the boss 290a. A plurality of clearances 202 are provided on the handrail movement sprocket 320a to avoid interference with the flanges 460 of the boss 290a. Therefore, when replacing the bearings 27a, 27b, the worker can move the handrail movement sprocket 320a and the driving sprocket 130 inward so as to move them away from the truss frame 11 arranged on the outside of the boss 290a by performing the above-mentioned predetermined work. This allows the worker to arrange the driving sprocket 13 at a position sufficiently distant from the truss frame 11 arranged on the outside of the boss 29a. Therefore, even if the diameter of the driving sprocket 130 is secured to be large, the worker can rotate the driving shaft 26 in a horizontal plane while avoiding interference between the driving sprocket 130 and the truss frame 11. As a result, the worker can smoothly replace the bearings 27a and 27b.

[0103] In the second embodiment, the boss 290a can be made smaller in size, as in the first embodiment. In the second embodiment, the flange portion 460 is divided into a plurality of portions in the circumferential direction of the boss 290a, so that the amount of material required to manufacture the boss 290a can be further reduced, compared to the boss 29a (see FIG. 6) described above.

[0104] <Third embodiment> Next, a passenger conveyor according to a third embodiment will be described. The passenger conveyor according to the third embodiment is different from the passenger conveyor according to the second embodiment described above in that the configuration of the step movement sprocket is different.

[0105] [Step movement sprocket configuration] FIG. 22 is a front view showing the configuration of a step movement sprocket 310a according to the third embodiment. A step movement sprocket 310a shown in FIG. 22 is a sprocket that is attached to the boss 290a described above, in place of the step movement sprocket 31a described above. As shown in Fig. 22, the step movement sprocket 310a has a plurality of fitting protrusions 301 and a plurality of clearance portions 302. The plurality of fitting protrusions 301 are formed integrally with the step movement sprocket 310a. The plurality of fitting protrusions 301 are formed in a state in which they protrude from the outer periphery side of the step movement sprocket 310a toward the inner periphery side (the center of the step movement sprocket 310a). The fitting protrusions 301 correspond to third fitting protrusions.

[0106] The protruding end faces 301a of the multiple fitting protrusions 301 are curved in an arc shape along the imaginary circle 303. The protruding end faces 301a of the fitting protrusions 301 are end faces located radially inside the step movement sprocket 310a, so they may be referred to as the inner end faces of the fitting protrusions 301. The imaginary circle 303 is a circle (a perfect circle) having a common center with the step movement sprocket 310a. The outer diameter of the cylindrical portion 450 of the boss 290a described above is slightly smaller than the diameter of the imaginary circle 303. For example, the dimensional difference between the diameter of the imaginary circle 303 and the outer diameter of the cylindrical portion 450 is preferably 0.01 mm or more and 0.2 mm or less, but other dimensions are also possible. The diameter of the imaginary circle 303 is equal to the distance between the protruding end faces 301a of the two fitting protrusions 301 facing each other on the imaginary center line passing through the center of the step movement sprocket 310a.

[0107] As a result, when the multiple fitting protrusions 301 are fitted into the cylindrical portion 450 (second cylindrical portion 480) of the boss 290a, a small gap is formed between the outer circumferential surface of the cylindrical portion 450 and the tip surface 301a of each fitting protrusion 301. Therefore, the worker can rotate the step movement sprocket 310a in the circumferential direction of the boss 290a using the outer circumferential surface of the cylindrical portion 450 of the boss 290a as a guide surface. In addition, the worker can move the step movement sprocket 310a in the central axis direction of the boss 290a using the outer circumferential surface of the cylindrical portion 450 as a guide surface.

[0108] In this embodiment, as an example, six fitting protrusions 301 and six recesses 302 are provided in the circumferential direction of the step movement sprocket 310a. In this case, the six fitting protrusions 301 are arranged at an angular pitch of 60° in the circumferential direction of the step movement sprocket 310a. In the circumferential direction of the step movement sprocket 310a, the fitting protrusions 301 and the recesses 302 are arranged alternately so as to be adjacent to each other. Therefore, the multiple (six in the illustrated example) recesses 302 are arranged at the same angular pitch as the multiple fitting protrusions 301.

[0109] Further, the step movement sprocket 310a is provided with a plurality of fixing holes 304. The plurality of fixing holes 304 are holes for fixing the step movement sprocket 310a to the boss 290a. Specifically, the fixing holes 304 are holes for fixing the fitting protrusion 301 of the step movement sprocket 310a to the boss 290a. For this reason, one fixing hole 304 is provided for each fitting protrusion 301. The plurality of fixing holes 304 (six in this embodiment) are arranged around the imaginary circle 303. Each fixing hole 304 is provided in a state in which it penetrates the fitting protrusion 301 of the step movement sprocket 310a in the thickness direction. The inner diameter (diameter) of the fixing hole 204 of the step movement sprocket 310a is the same as that of the fixing hole 39 of the step movement sprocket 31a described above. Additionally, the fixing holes 304 are provided at the same angular pitch as the fitting protrusions 301. The number, positions and pitch circle diameter of the fixing holes 304 in the step movement sprocket 310a are the same as the number, positions and pitch circle diameter of the fixing holes 39 in the step movement sprocket 31a described above.

[0110] The multiple clearances 302 are formed to avoid interference with the multiple flanges 460 of the boss 290a described above. The clearances 302 correspond to third clearances. The multiple clearances 302 are formed radially outward of the imaginary circle 303. The multiple clearances 302 are formed in a petal shape. Each clearance 302 communicates with a space surrounded by the imaginary circle 303. Each clearance 302 is formed by removing a part of the step movement sprocket 310a. The recessed area of ​​the clearance 302 outside the imaginary circle 303 is secured to be larger than the area of ​​the flanges 460 of the boss 29a described above.

[0111] Fig. 23 is a front view (part 1) showing the arrangement of each part when the driving sprocket 130, the sprocket 320a for moving on the handrail, and the sprocket 310a for moving on the step are attached to the boss 290a in the passenger conveyor according to the third embodiment. Fig. 24 is a front view (part 2) showing the arrangement of each part when the driving sprocket 130, the sprocket 320a for moving on the handrail, and the sprocket 310a for moving on the step are attached to the boss 290a in the passenger conveyor according to the third embodiment. In Fig. 23, the shapes of each sprocket (130, 320a, 310a) are all shown by solid lines, regardless of the positional relationship between the driving sprocket 130, the sprocket 320a for moving on the handrail, and the sprocket 310a for moving on the step in the depth direction of the paper. In FIG. 24, a part of the drive sprocket 130, a part of the handrail movement sprocket 320a, and a part of the step movement sprocket 310a are omitted on both sides of the break line 151.

[0112] 23 and 24, the handrail movement sprocket 320a and the drive sprocket 130 are aligned with the boss 290a, similarly to the second embodiment (see Figs. 18 and 19), with respect to the multiple flange portions 460 of the boss 290a. The step movement sprocket 310a is aligned with the boss 290a, which has multiple flange portions 460, as follows.

[0113] The step movement sprocket 310a is aligned with the boss 290a such that the end faces 301a (see FIG. 22) of the multiple fitting protrusions 301 fit into the outer periphery of the cylindrical portion 450 (second cylindrical portion 480) of the boss 290a and, in this state, the sprocket fixing holes 550 of the flange portion 460 and the fixing holes 304 of the fitting protrusions 301 overlap concentrically (are positioned at the same position). The step movement sprocket 310a is also aligned with the boss 290a such that the end sides of the multiple fitting protrusions 301 overlap the corresponding thick portions 460a (see FIG. 14) of the flange portion 460.

[0114] 23, the fitting protrusions 101 of the drive sprocket 130 and the fitting protrusions 301 of the step movement sprocket 310a are arranged in the same position in the circumferential direction of the boss 290a. The fixing holes 304 of the step movement sprocket 310a are arranged in the same position as the fixing holes 104 of the step movement sprocket 310a and the sprocket fixing holes 550 of the boss 290a.

[0115] In the passenger conveyor according to the third embodiment, the handrail movement sprocket 320a is aligned with the boss 290a in the same manner as in the second embodiment, and the handrail movement sprocket 320a is fastened and fixed to the boss 290a using a plurality of bolts 37a. In the third embodiment, the drive sprocket 130 is aligned with the boss 290a in the same manner as in the second embodiment, and the step movement sprocket 310a is aligned with the boss 290a as described above. The drive sprocket 130 and the step movement sprocket 310a are fastened and fixed to the boss 290a using a plurality of bolts 33 and a plurality of nuts 34. The drive sprocket 130 is fixed to the first fixing surface 51 of the boss 290a by the fastening force of the bolt 33 and the nut 34. The step movement sprocket 310a is fixed to the second fixing surface 520 of the boss 290a by the fastening force of the bolt 33 and the nut 34. The handrail movement sprocket 320a is fixed to the third fixing surface 530 of the boss 290a by the tightening force of the bolt 37a.

[0116] Furthermore, in the passenger conveyor according to the third embodiment, after the handrail movement sprocket 320a, the drive sprocket 130, and the step movement sprocket 310a are attached to the boss 290a as described above, an operator can perform a predetermined operation to move each sprocket (130, 320a, 310a) outward. The "outward" described here refers to the side away from the intermediate portion P in the longitudinal direction of the drive shaft 26. The predetermined operation is performed, for example, to replace the step movement sprocket 310a. The procedure of the predetermined operation will be described below.

[0117] First, the worker temporarily moves the step movement sprocket 310a, the handrail movement sprocket 320a, and the drive sprocket 130 inward in a procedure basically similar to that of the second embodiment.

[0118] Next, the worker removes the bolts and the like that secure the bearing holders 28a, 28b to the truss frame 11, and then rotates the drive shaft 26 in the R direction (see FIG. 3) within the horizontal plane, with the vicinity of the middle part P in the longitudinal direction of the drive shaft 26 as the rotation center. Next, the worker removes the bearing holder 28a from the drive shaft 26.

[0119] Next, as shown in Figures 20 and 21 above, the worker aligns the handrail moving sprocket 320a and the driving sprocket 130, and then moves the handrail moving sprocket 320a and the driving sprocket 130 outward. This enables the worker to remove the handrail moving sprocket 320a and the driving sprocket 130 from the boss 290a.

[0120] Next, with multiple fitting protrusions 301 of step movement sprocket 310a fitted into cylindrical portion 450 (second cylindrical portion 48) of boss 290a, the worker appropriately rotates step movement sprocket 310a to align each relief portion 302 of step movement sprocket 310a with each flange portion 460 of boss 290a in the circumferential direction of boss 290a, as shown in Fig. 25. This enables step movement sprocket 310a to move outward from flange portion 460 (to the side away from middle portion P in the longitudinal direction of drive shaft 26) without interfering with flange portion 460.

[0121] Therefore, the worker can remove the step movement sprocket 310a from the boss 290a by moving the step movement sprocket 310a outward. Also, the worker can install, for example, a new step movement sprocket 310a together with the above-mentioned parts by reversing the above-mentioned procedure.

[0122] In this way, in the passenger conveyor according to the third embodiment, in addition to the same effects as those of the second embodiment described above, the effect of being able to accommodate replacement of the step movement sprocket 310a can be obtained.

[0123] Furthermore, as an application example of the third embodiment, even if boss 29b has a configuration similar to that of boss 290a and step movement sprocket 310a is attached to boss 29b (a boss having a configuration similar to that of boss 290a) instead of step movement sprocket 31b, step movement sprocket 310a can be removed from boss 29b and replaced.

[0124] <Modifications, etc.> The present invention is not limited to the above-described embodiment, but includes various modified examples. For example, the above-described embodiment has been described in detail to facilitate understanding of the contents of the present invention, but the present invention is not necessarily limited to having all the configurations described in the above-described embodiment. It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to delete a part of the configuration of each embodiment, add another configuration, or replace it with another configuration. [Explanation of symbols]

[0125] 10... passenger conveyor, 13... drive sprocket, 26... drive shaft, 29a, 29b... boss, 31a, 31b... sprocket for moving along steps, 32a, 32b... sprocket for moving along handrails, 45... cylindrical portion, 46... flange portion, 46a... thick portion, 46b... thin portion, 55... sprocket fixing hole (first fixing hole), 56... screw hole (second fixing hole), 61... mating protrusion, 62... relief portion, 101... mating protrusion (first mating protrusion), 102... relief portion ( 201...engagement protrusion (second engagement protrusion), 202...relief portion (second relief portion), 130...drive sprocket, 301...engagement protrusion (third engagement protrusion), 302...relief portion (third relief portion), 310a...step movement sprocket, 320a...handrail movement sprocket, 450...cylindrical portion, 460...flange portion, 460a...thick portion, 460b...thin portion, 550...sprocket fixing hole (first fixing hole), 560...screw hole (second fixing hole)

Claims

1. A drive shaft; A boss that rotates integrally with the drive shaft; a drive sprocket, a step movement sprocket, and a handrail movement sprocket, which are attached to the boss, the boss has a cylindrical portion into which the drive sprocket, the step movement sprocket, and the handrail movement sprocket are fitted, and a flange portion to which the drive sprocket, the step movement sprocket, and the handrail movement sprocket, which are fitted into the cylindrical portion, are fixed, the flange portion has a plurality of thick portions and a plurality of thin portions adjacent to each other in a circumferential direction of the boss, Each of the plurality of thick portions has a first fixing hole for fixing the drive sprocket and the step movement sprocket to the flange portion, Each of the plurality of thinned portions has a second fastening hole for fastening the handrail movement sprocket to the flange portion. Passenger conveyor.

2. The pitch circle diameter of the first fixing hole is the same as the pitch circle diameter of the second fixing hole.

2. A passenger conveyor as claimed in claim 1.

3. The handrail movement sprocket has a plurality of fitting protrusions that are fixed to the flange portion in a state where the sprocket is fitted to the cylindrical portion, and a plurality of relief portions for avoiding interference with the plurality of thick portions.

2. A passenger conveyor as claimed in claim 1.

4. The flange portion is divided into a plurality of portions in the circumferential direction of the boss.

2. A passenger conveyor as claimed in claim 1.

5. the drive sprocket has a plurality of first fitting protrusions fixed to the flange portion in a state where the drive sprocket is fitted to the cylindrical portion, and a plurality of first relief portions for avoiding interference with the flange portion divided into a plurality of parts, The handrail movement sprocket has a plurality of second fitting protrusions that are fixed to the flange portion in a state where the sprocket is fitted to the cylindrical portion, and a plurality of second relief portions for avoiding interference with the flange portion that is divided into a plurality of parts. A passenger conveyor as claimed in claim 4.

6. The step movement sprocket has a plurality of third fitting protrusions that are fixed to the flange portion in a state where the sprocket is fitted to the cylindrical portion, and a plurality of third relief portions for avoiding interference with the flange portion that is divided into a plurality of parts. A passenger conveyor according to claim 4 or 5.

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