Passenger conveyor

Abstract

To avoid interference of a drive sprocket with surrounding parts even in cases where the secured diameter of the drive sprocket is large, and to enable a drive shaft to rotate within a horizontal plane.SOLUTION: A passenger conveyor comprises: a drive shaft; a boss integrally rotating with the drive shaft; and a drive sprocket that can be mounted on the boss. The boss comprises: a cylindrical part into which the drive sprocket is fit; and a plurality of flange parts formed by being split apart in a circumferential direction of the boss, the flange parts to which the drive sprocket fit into the cylindrical part is fixed. The drive sprocket has: a plurality of fitting protrusions that are fixed to the flange parts while being fit into the cylindrical part; and a plurality of relief parts for avoiding interference with the plurality of flange parts.SELECTED DRAWING: Figure 10

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 the drive shaft (see, for example, Patent Document 1). In addition to the drive sprocket, multiple sprockets, such as a sprocket for moving steps and a sprocket for driving a handrail, are attached to the boss. The drive sprocket is disposed closer to the end of the drive shaft (closer to the bearings) than the other sprockets. In order to increase the torque transmitted to the drive sprocket via the drive chain, it is advantageous to ensure that the diameter of the drive sprocket is large. The pair of bearings are each held by a bearing holder. The bearing holder is attached to a truss frame. [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] The above-mentioned bearings may be replaced due to, for example, the end of their life or failure. The truss frame is placed close to the outside of the bearing holder in order to make the width dimension of the truss frame as small as possible. For this reason, when replacing the bearing, it is necessary to remove the bearing holder from the truss frame, and then rotate the drive shaft in a horizontal plane with the bearing holder and various sprockets attached to the drive shaft. However, if the diameter of the drive sprocket is made large, the drive sprocket is likely to interfere with surrounding parts when the drive shaft is rotated in a horizontal plane.

[0005] An object of the present invention is to provide a passenger conveyor that can rotate a drive shaft in a horizontal plane while avoiding interference between the drive sprocket and surrounding components even when the diameter of the drive sprocket is large. [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 that rotates integrally with the drive shaft, and a drive sprocket attached to the boss. The boss has a cylindrical portion into which the drive sprocket is fitted, and a number of flange portions that are formed by dividing the boss in the circumferential direction and to which the drive sprocket is fixed that is fitted to the cylindrical portion. The drive sprocket has a number of fitting protrusions that are fixed to the flanges in a state where it is fitted to the cylindrical portion, and a number of relief portions for avoiding interference with the number of flange portions. Effect of the Invention

[0007] According to the present invention, even if the diameter of the drive sprocket is made large, interference between the drive sprocket and surrounding components can be avoided and the drive shaft can be rotated within a horizontal plane. 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 boss provided on the passenger conveyor according to the first embodiment. [Figure 6] 6 is a cross-sectional view of the boss shown in FIG. 5 along the line VI-VI. [Figure 7] FIG. 2 is a front view showing a configuration of a drive sprocket provided in the passenger conveyor according to the first embodiment. [Figure 8] FIG. 2 is a diagram showing an arrangement of bosses and step movement sprockets in the passenger conveyor according to the first embodiment. [Figure 9] FIG. 2 is a diagram showing a state in which a flange portion of a boss and a fitting protrusion of a drive sprocket are aligned in the passenger conveyor according to the first embodiment. [Figure 10] FIG. 2 is a diagram showing a state in which a flange portion of a boss and a relief portion of a drive sprocket are aligned in the passenger conveyor according to the first embodiment. [Figure 11] FIG. 11 is a front view showing the configuration of a step movement sprocket provided on a passenger conveyor according to a second embodiment. [Figure 12] FIG. 11 is a diagram showing an arrangement of a drive sprocket and a step movement sprocket in a passenger conveyor according to a second embodiment, as viewed from the drive sprocket side. [Figure 13] FIG. 11 is a front view showing the configuration of a step movement sprocket provided on a passenger conveyor according to a third embodiment. [Figure 14] FIG. 11 is a diagram showing an arrangement state when a step movement sprocket is attached to a boss in a passenger conveyor according to a third embodiment. [Figure 15] 13 is a diagram showing a state in which a flange portion of a boss and a second relief portion of a step movement sprocket are aligned in a passenger conveyor according to a third embodiment. FIG. 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 also 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 one handrail drive sprocket 32.

[0015] The drive sprocket 13, the step movement sprockets 31a, 31b, and the handrail drive sprocket 32 ​​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 diameters of each of the step movement sprockets 31a, 31b are the same. The diameters of each of the step movement sprockets 31a, 31b are larger than the diameter (outer diameter) of the handrail drive sprocket 32.

[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 in the longitudinal direction of the drive shaft 26 may be described as the "inner side", and the side away from the intermediate portion P in the longitudinal direction 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 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 outwardly of the step movement sprocket 31a (closer to the bearing 27a). The step movement sprocket 31b is attached to the boss 29b. The handrail drive sprocket 32 ​​is attached to the boss 29b. At the attachment position of the boss 29b, the handrail drive sprocket 32 ​​is disposed outwardly of the step movement sprocket 31b (closer to the bearing 27b).

[0022] The driving sprocket 13 and the step movement sprocket 31a are fastened (together) to the boss 29a using a plurality of bolts 33 and a plurality of nuts 34. The step movement sprocket 31b and the handrail driving sprocket 32 ​​are fastened (together) to the boss 29b using a plurality of bolts 35 and a plurality of nuts 36.

[0023] [Step movement sprocket configuration] FIG. 4 is a front view showing the configuration of step movement sprockets 31a, 31b provided on 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.

[0024] A circular mounting hole 38 is provided at 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 provided in a state of penetrating 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 φDa (see Figs. 5 and 6) of a cylindrical portion 41 of the boss 29a described later. For example, the dimensional difference between the inner diameter of the mounting hole 38 and the outer diameter φDa of the cylindrical portion 41 is preferably 0.01 mm or more and 0.2 mm or less, but other dimensions are also possible. This allows the operator to fit the mounting hole 38 of the step movement sprocket 31a into the cylindrical portion 41 (second cylindrical portion 41b) 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 41 as a guide surface. Furthermore, the worker can use the outer circumferential surface of the cylindrical portion 41 as a guide surface to move the step movement sprocket 31a in the direction of the central axis of the boss 29a.

[0025] 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 (an angular pitch of 60° in this embodiment) in the circumferential direction of the step movement sprocket 31a. The fixing holes 39 are also arranged around the attachment hole 38. Each fixing hole 39 is provided so as to penetrate 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 bolt 33 and nut 34 described above.

[0026] [Handrail drive sprocket configuration] The handrail driving sprocket 32 ​​is a sprocket that generates a driving force for circulating the handrail 17. The driving force generated by the handrail driving sprocket 32 ​​is transmitted from the driving device 22 via the driving chain 25 to the driving sprocket 13, and is obtained by rotating the boss 29b integrally with the driving shaft 26.

[0027] The handrail driving sprocket 32 ​​has a configuration basically similar to that of the step movement sprockets 31a, 31b. Although not shown, the handrail driving sprocket 32 ​​transmits a driving force for rotating the pair of handrail movement sprockets to the pair of handrail movement sprockets via a chain and a sprocket. The pair of handrail movement sprockets are sprockets for circulating the handrail 17. The pair of handrail movement sprockets are attached to a rotating shaft (not shown) and rotate integrally with the rotating shaft.

[0028] [Boss configuration] Fig. 5 is a front view showing the configuration of the boss 29a provided on the passenger conveyor 10 according to the first embodiment. Fig. 6 is a cross-sectional view taken along line VI-VI of the boss shown in Fig. 5. As shown in Figs. 5 and 6, the boss 29a integrally has a cylindrical portion 41 and a plurality of flange portions 42. The cylindrical portion 41 is a portion into which the driving sprocket 13 and the step movement sprocket 31a are fitted. The cylindrical portion 41 has an outer diameter of φDa (mm). The cylindrical portion 41 has a first cylindrical portion 41a and a second cylindrical portion 41b. The outer diameter φDa of the fixing hole 41 is common to the first cylindrical portion 41a and the second cylindrical portion 41b. The first cylindrical portion 41a 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, a plurality of fitting protrusions 51 (see Fig. 7) of the driving sprocket 13 are fitted to the outer periphery of the first cylindrical portion 41a. The second cylindrical portion 41b 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 into the outer periphery of the second cylindrical portion 41b.

[0029] The cylindrical portion 41 is provided with a fitting hole 43. The fitting hole 43 forms a hollow portion of the cylindrical portion 41. The fitting hole 43 is formed by the inner peripheral surface of the cylindrical portion 41. The fitting hole 43 is provided at the center of the cylindrical portion 41 when the boss 29a is viewed from the front direction. The fitting hole 43 is provided in a state in which it penetrates the boss 29a in the central axis direction. The fitting hole 43 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 43 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 43 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 43 becomes larger than the outer diameter of the drive shaft 26 at room temperature.

[0030] The flanges 42 are portions for fixing the driving sprocket 13, which is fitted to the cylindrical portion 41, to the boss 29a. The flanges 42 are formed radially in a state of protruding radially outward from the outer circumferential surface of the cylindrical portion 41. If the flanges of the boss 29a are annular (donut-shaped) when viewed from the front, the flanges 42 are formed by removing unnecessary portions of the annular flanges. The flanges 42 are divided into a plurality of portions in the circumferential direction of the boss 29a. The flanges 42 are arranged at a predetermined angular pitch in the circumferential direction of the boss 29a. In this embodiment, as an example, six flanges 42 are provided on the boss 29a. In this case, the six flanges 42 are arranged at an angular pitch of 60° in the circumferential direction of the boss 29a.

[0031] Each flange portion 42 is formed in a substantially trapezoidal shape when the boss 29a is viewed from the front. Each flange portion 42 is provided with a sprocket fixing hole 44. The sprocket fixing hole 44 is a hole for fixing the drive sprocket 13 and the step movement sprocket 31a to the boss 29a. The sprocket fixing hole 44 is provided in a substantially central portion of the flange portion 42. The sprocket fixing hole 44 is provided in a state in which it penetrates the flange portion 42. The sprocket fixing hole 44 is a hole into which the above-mentioned bolt 33 (see FIG. 3) can be inserted when attaching the drive sprocket 13 and the step movement sprocket 31a to the boss 29a. The inner diameter of the sprocket fixing hole 44 in the boss 29a is the same as the inner diameter of the fixing hole 39 in the step movement sprocket 31a described above. The sprocket fixing holes 44 are provided at the same angular pitch as the flange portion 42 and in the same number as the flange portion 42. The number, positions and pitch circle diameter of the sprocket fixing holes 44 in the boss 29a are the same as the number, positions and pitch circle diameter of the fixing holes 39 in the step movement sprocket 31a described above.

[0032] Each flange portion 42 is provided with a first fixing surface 46 and a second fixing surface 47. The first fixing surface 46 is a surface for fixing the drive sprocket 13 to the flange portion 42 of the boss 29a. The second fixing surface 47 is a surface for fixing the step movement sprocket 31a to the flange portion 42 of the boss 29a. The first fixing surface 46 and the second fixing surface 47 are arranged facing in opposite directions. Specifically, the first fixing surface 46 is arranged on a side away from the intermediate portion P in the longitudinal direction of the drive shaft 26, that is, facing outward, at the mounting position of the boss 29a. The second fixing surface 47 is arranged on a side approaching the intermediate portion P in the longitudinal direction of the drive shaft 26, that is, facing inward, at the mounting position of the boss 29a.

[0033] [Drive sprocket configuration] FIG. 7 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. 7, the drive sprocket 13 has a plurality of fitting protrusions 51 and a plurality of recesses 52. The multiple fitting protrusions 51 are formed integrally with the drive sprocket 13. The multiple fitting protrusions 51 are formed so as to protrude from the outer periphery side of the drive sprocket 13 toward the inner periphery side (the center of the drive sprocket 13). The width dimension of the fitting protrusions 51 in the circumferential direction of the drive sprocket 13 is approximately constant.

[0034] The protruding end faces 51a of the multiple fitting protrusions 51 are curved in an arc shape along an imaginary circle 53. The protruding end faces 51a of the fitting protrusions 51 are end faces located radially inside the drive sprocket 13, so they may be referred to as the inner end faces of the fitting protrusions 51. The imaginary circle 53 is a circle (a perfect circle) having a common center with the drive sprocket 13. The outer diameter φDa (see FIG. 5 and FIG. 6) of the cylindrical portion 41 of the boss 29a described above is slightly smaller than the diameter φDb (mm) of the imaginary circle 53. For example, the dimensional difference (φDb-φDa) between the diameter φDb (mm) of the imaginary circle 53 and the outer diameter φDa of the cylindrical portion 41 is preferably 0.01 mm or more and 0.2 mm or less, but may be other dimensions. The diameter φDb of the imaginary circle 53 is equal to the distance between the protruding end faces 51a of the two fitting protrusions 51 facing each other on an imaginary center line 55 passing through the center of the drive sprocket 13.

[0035] As a result, when the multiple fitting protrusions 51 are fitted into the cylindrical portion 41 (first cylindrical portion 41a) of the boss 29a, a small gap is formed between the outer circumferential surface of the cylindrical portion 41 and the tip end surface 51a of each fitting protrusion 51. Therefore, the worker can rotate the drive sprocket 13 in the circumferential direction of the boss 29a using the outer circumferential surface of the cylindrical portion 41 of the boss 29a as a guide surface. In addition, the worker can move the drive sprocket 13 in the central axis direction of the boss 29a using the outer circumferential surface of the cylindrical portion 41 as a guide surface.

[0036] In this embodiment, as an example, six fitting protrusions 51 and six recesses 52 are provided in the circumferential direction of drive sprocket 13. In this case, the six fitting protrusions 51 are arranged at an angular pitch of 60° in the circumferential direction of drive sprocket 13. In the circumferential direction of drive sprocket 13, fitting protrusions 51 and recesses 52 are arranged alternately so as to be adjacent to each other. Therefore, the multiple (six in the illustrated example) recesses 52 are arranged at the same angular pitch as the multiple fitting protrusions 51.

[0037] Further, the driving sprocket 13 is provided with a plurality of fixing holes 54. The fixing holes 54 are holes for fixing the driving sprocket 13 to the boss 29a. Specifically, the fixing holes 54 are holes for fixing the fitting protrusions 51 of the driving sprocket 13 to the flange portions 42 of the boss 29a. For this reason, one fixing hole 54 is provided for each fitting protrusion 51. The plurality of fixing holes 54 (six in this embodiment) are arranged around the imaginary circle 53. Each fixing hole 54 is provided in a state penetrating the fitting protrusions 51 of the driving sprocket 13 in the thickness direction. The inner diameter (diameter) of the fixing holes 54 in the driving sprocket 13 is the same as the inner diameter of the fixing holes 39 in the step movement sprocket 31a described above. Furthermore, the fixing holes 54 are provided at the same angular pitch as the fitting protrusions 51. The number, positions and pitch circle diameter of the fixing holes 54 in the drive sprocket 13 are the same as the number, positions and pitch circle diameter of the fixing holes 39 in the step movement sprocket 31a described above.

[0038] The plurality of recesses 52 are formed to avoid interference with the plurality of flange portions 42 of the boss 29a described above when replacing the bearings 27a, 27b. The plurality of recesses 52 are formed radially outward from the imaginary circle 53. The plurality of recesses 52 are formed in a petal shape. Each recess 52 communicates with a space surrounded by the imaginary circle 53. Communication means spatial connection. Each recess 52 is formed in a state where a part of the drive sprocket 13 is hollowed out. The width dimension of the recess 52 in the circumferential direction of the drive sprocket 13 is narrowest near the imaginary circle 53 and gradually widens from the vicinity of the imaginary circle 53 toward the radially outer side. The recessed area of ​​the recess 52 outside the imaginary circle 53 is secured to be sufficiently larger than the area of ​​the flange portion 42 of the boss 29a described above. The reason for this will be described later.

[0039] [Sprocket installation procedure] Here, a procedure will be described for attaching the step movement sprocket 31a and the drive sprocket 13 to the boss 29a. Either the step movement sprocket 31a or the drive sprocket 13 may be attached to the boss 29a first.

[0040] When mounting the step movement sprocket 31a to the boss 29a, the worker first fits the mounting hole 38 of the step movement sprocket 31a into the outer periphery of the second cylindrical portion 41b of the boss 29a. The worker also presses the step movement sprocket 31a against the second fixing surface 47 of the flange portion 42 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 44 of the boss 29a and the fixing hole 39 of the step movement sprocket 31a are concentrically overlapping (placed in the same position) as shown in FIG.

[0041] When mounting the drive sprocket 13 on the boss 29a, the worker first fits the protruding end faces 51a of the fitting protrusions 51 of the drive sprocket 13 onto the outer periphery of the first cylindrical portion 41a of the boss 29a. The worker also presses the fitting protrusions 51 of the drive sprocket 13 against the first fixing surface 46 of the flange portion 42 of the boss 29a. In this state, the worker aligns the flange portion 42 of the boss 29a with the fitting protrusions 51 of the drive sprocket 13 as shown in FIG. 9. Specifically, the worker aligns the boss 29a with the drive sprocket 13 so that the sprocket fixing holes 44 of the flange portion 42 and the fixing holes 54 of the fitting protrusions 51 are concentrically overlapping (placed at the same position).

[0042] After aligning the drive sprocket 13, boss 29a, and step movement sprocket 31a in this manner, the worker installs the six bolts 33 in this state. In this case, the worker installs each bolt 33 in the following procedure. First, the worker inserts the bolt 33 from the step movement sprocket 31a side. At this time, the shaft portion (including the male thread portion) of the bolt 33 passes through the fixing hole 39 of the step movement sprocket 31a, the sprocket fixing hole 44 of the boss 29a, and the fixing hole 54 of the drive sprocket 13, and protrudes toward the drive sprocket 13 side.

[0043] Next, the worker attaches the nuts 34 to the six bolts 33 by engaging them with each other. The worker also tightens each nut 34 to a predetermined torque using a tool such as a wrench. At this time, the tightening force of the nuts 34 acts to press and fix the fitting protrusion 51 of the driving sprocket 13 against the first fixing surface 46 of the boss 29a. The tightening force of the nuts 34 also acts to press and fix the step movement sprocket 31a against the second fixing surface 47 of the boss 29a. As a result, the driving sprocket 13 and the step movement sprocket 31a are fastened and fixed to the flange portion 42 of the boss 29a by using the multiple bolts 33 and the multiple nuts 34. The step movement sprocket 31a and the driving sprocket 13 are attached to the boss 29a with the flange portion 42 of the boss 29a sandwiched between the step movement sprocket 31a and the driving sprocket 13. This completes the attachment of the drive sprocket 13 and the step movement sprocket 31a to the boss 29a.

[0044] After mounting the drive sprocket 13 and the step movement sprocket 31a to the boss 29a in this manner, the worker mounts the boss 29a to the drive shaft 26 by shrink fitting or the like.

[0045] The boss 29b may have the same structure as the boss 29a described above, or may have a different structure. The mounting structure of the step movement sprocket 31b to the boss 29b is basically the same as the mounting structure of the step movement sprocket 31a to the boss 29a. The mounting structure of the handrail drive sprocket 32 ​​to the boss 29b is basically the same as the mounting structure of the drive sprocket 13 to the boss 29a. That is, the handrail drive sprocket 32 ​​and the step movement sprocket 31b are fastened and fixed to the flange portion of the boss 29b by using a plurality of bolts 35 and a plurality of nuts 36. The method of mounting the boss 29b to the drive shaft 26 is the same as the method of mounting the boss 29a to the drive shaft 26.

[0046] 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.

[0047] [Bearing replacement procedure] Next, a procedure for replacing the bearings 27a and 27b will be described. Note that it is assumed that the chains have been removed from the various sprockets before starting the replacement work of the bearings 27a and 27b. When replacing the bearings 27a, 27b, the worker must remove the bolts and the like that secure 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 13 is made large, the drive sprocket 13 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 13 is likely to interfere. In addition, if the diameter of the drive sprocket 13 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 13 and the truss frame 11.

[0048] In this embodiment, a plurality of flange portions 42 are provided in a divided state on the outer periphery of boss 29a, and drive sprocket 13 is provided with a plurality of relief portions 52 to avoid interference with flange portion 42 of boss 29a. Therefore, when replacing bearings 27a, 27b, a worker can move step movement sprocket 31a and drive sprocket 13 inward (toward the middle portion P in the longitudinal direction of drive shaft 26) by the following procedure.

[0049] First, the worker removes the bolts 33 and the nuts 34, and then moves the step movement sprocket 31a inward.

[0050] Next, the worker appropriately rotates the drive sprocket 13 to align each recess 52 of the drive sprocket 13 with each flange portion 42 of the boss 29a in the circumferential direction of the boss 29a, as shown in Fig. 10. Fig. 10 shows a state in which the drive sprocket 13 has been rotated 60° clockwise or counterclockwise from the state shown in Fig. 9. In this case, when viewed from the central axial direction of the boss 29a, the flange portion 42 of the boss 29a is disposed within the space formed by the recess 52 of the drive sprocket 13. This allows the drive sprocket 13 to move inward of the flange portion 42 (toward the middle portion P in the longitudinal direction of the drive shaft 26) without interfering with the flange portion 42.

[0051] Therefore, the worker can move the drive sprocket 13 inward so as to move away from the truss frame 11 arranged on the outside of the boss 29a. This allows the worker to place the drive sprocket 13 at a position sufficiently away from the truss frame 11 arranged on the outside of the boss 29a.

[0052] Next, the worker removes bearing holder 28a together with bearing 27a from one end 26a of drive shaft 26. The worker also removes bearing holder 28b together with bearing 27b from the other end 26b of drive shaft 26.

[0053] Next, the worker replaces the bearing 27a attached to the bearing holder 28a with, for example, a new bearing 27a. The worker also replaces the bearing 27b attached to the bearing holder 28b with, for example, a new bearing 27b.

[0054] This completes the replacement of the bearings 27a and 27b. After replacing the bearings 27a and 27b in this manner, the worker performs the installation work of each component in the reverse order to the above-described steps, thereby returning the bearings 27a and 27b to the state shown in FIG.

[0055] In this way, in the first embodiment, the drive sprocket 13 can be moved inward from the flange portion 42 of the boss 29a. Therefore, even if the diameter of the drive sprocket 13 is ensured to be large, the worker can rotate the drive shaft 26 in a horizontal plane while avoiding interference between the drive sprocket 13 and the truss frame 11. As a result, the worker can smoothly replace the bearings 27a and 27b.

[0056] 3, when the drive sprocket 13 is attached to the boss 29a, even if the diameter of the drive sprocket 13 is made large, the truss frame 11 located on the outer side of the boss 29a can be positioned closer to the drive sprocket 13. Therefore, the width dimension W of the truss frame 11 can be kept small.

[0057] In addition, parts that are likely to interfere with drive sprocket 13 when drive shaft 26 is rotated in a horizontal plane are not limited to truss frame 11, but may also be other parts located around drive sprocket 13.

[0058] <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 configuration of the step movement sprocket. FIG. 11 is a front view showing the configuration of a step movement sprocket 310 provided on a passenger conveyor according to the second embodiment. A step movement sprocket 310 shown in FIG. 11 is attached to the boss 29a in place of the step movement sprocket 31a shown in FIG.

[0059] As shown in Fig. 11, the step movement sprocket 310 has one mounting hole 311 and multiple fixing holes 312. The mounting hole 311 is formed in a circle at the center of the step movement sprocket 310. The multiple fixing holes 312 are arranged at a predetermined angular pitch (an angular pitch of 60° in this embodiment) in the circumferential direction of the step movement sprocket 310. The configuration described above is similar to the configuration of the step movement sprocket 31a having one mounting hole 38 and multiple fixing holes 39 as shown in Fig. 3.

[0060] The step movement sprocket 310 has a plurality of drilled holes 313 in addition to the above-mentioned one mounting hole 311 and the plurality of fixing holes 312. The plurality of drilled holes 313 are holes that allow an operator to insert his / her hands from the step movement sprocket 310 side to the drive sprocket 13 side when replacing the bearing 27a. The reason for providing such hand insertion drilled holes 313 in the step movement sprocket 310 is as follows.

[0061] As described in the first embodiment, in order to move the driving sprocket 13 inward, it is necessary to remove the multiple bolts 33 and the multiple nuts 34. In addition, in order to remove the nuts 34 from the bolts 33, it is necessary to loosen the nuts 34. The nuts 34 can be loosened using a tool such as a wrench. In addition, after the nuts 34 are loosened appropriately using a wrench or the like, it is efficient for a worker to manually rotate the nuts 34 to remove the nuts 34 from the bolts 33. However, from the viewpoint of keeping the width dimension W of the truss frame 11 small, the space between the driving sprocket 13 and the truss frame 11 is narrow, and even if a worker inserts his / her hand into the narrow space, the worker's fingers may not reach the nuts 34. In addition, when a wrench or the like is used in the narrow space between the driving sprocket 13 and the truss frame 11, the angle at which the wrench or the like can be rotated in one operation (the movable range of the wrench or the like) is limited. For this reason, it takes a long time for a worker to remove the nuts 34 from the bolts 33 only by rotating the wrench or the like.

[0062] Taking such a case into consideration, the second embodiment employs a configuration in which multiple punch holes 313 are provided in the step movement sprocket 310, and an operator can insert his / her hand from the inside (step movement sprocket 310 side) to the outside (drive sprocket 13 side) through the punch holes 313 of the step movement sprocket 310 and the relief portion 52 of the drive sprocket 13. In other words, the punch holes 313 formed in the step movement sprocket 310 are holes through which an operator can insert his / her hand from the inside to the outside through the punch holes 313 of the step movement sprocket 310 and the relief portion 52 of the drive sprocket 13.

[0063] The multiple voids 313 are arranged at a predetermined angular pitch (an angular pitch of 60° in this embodiment) in the circumferential direction of the step movement sprocket 310. In addition, each void 313 is provided at a different position from each of the fixing holes 312 in the circumferential direction of the step movement sprocket 310.

[0064] The multiple punch holes 313 are formed corresponding to the multiple recesses 52 of the drive sprocket 13 shown in FIG. 7. Specifically, the shape of each of the fixing holes 312 in the step movement sprocket 310 is formed to correspond to the shape of each of the recesses 52 in the drive sprocket 13 shown in FIG. 7. However, in FIG. 7, each of the recesses 52 communicates with a space surrounded by an imaginary circle 53, whereas each of the punch holes 313 does not communicate with the space of the mounting hole 311. The punch holes 313 have an inner edge 313a. The inner edge 313a is disposed radially outward of the mounting hole 311. Each of the punch holes 313 is formed with a predetermined dimension. The predetermined dimension will be described later.

[0065] Fig. 12 is a diagram showing the arrangement of the drive sprocket 13 and the step movement sprocket 310 in the passenger conveyor according to the second embodiment, as viewed from the drive sprocket 13 side. Fig. 12 shows the arrangement of the sprockets (13, 310) when the drive sprocket 13 and the step movement sprocket 310 are attached to the boss 29a, but the boss 29a is not shown. 12, when the drive sprocket 13 and the step movement sprocket 310 are attached to the boss 29a, the multiple fixing holes 54 of the drive sprocket 13 and the multiple fixing holes 312 of the step movement sprocket 310 are arranged in the same positions so as to overlap each other. Also, the multiple relief portions 52 of the drive sprocket 13 and the multiple punched holes 313 of the step movement sprocket 310 are arranged in the same positions so as to overlap each other.

[0066] In this case, at the position where the relief portion 52 of the drive sprocket 13 and the punched hole 313 of the step movement sprocket 310 overlap, a space 315 is formed that penetrates in a direction parallel to the central axis of each sprocket (13, 310). The size of the space 315 is determined mainly by the dimensions of the punched hole 313. The reason for this is that in this embodiment, when the drive sprocket 13 and the step movement sprocket 310 are arranged as shown in Figure 12, the punched hole 313 is arranged following the shape of the relief portion 52 except for the inner edge portion 313a, and the inner peripheral side of the above-mentioned space 315 is defined by the inner edge portion 313a of the punched hole 313.

[0067] Here, the technical significance of the predetermined dimensions of the punched hole 313 will be described. 11, the dimension of the punched hole 313 is determined by the dimension La (mm) of the punched hole 313 in the circumferential direction of the step movement sprocket 310 and the dimension Lb (mm) of the punched hole 313 in the radial direction of the step movement sprocket 310. The dimension from the center of the step movement sprocket 310 to the outer edge of the punched hole 313 is approximately the same as the dimension from the center of the drive sprocket 13 to the outer edge of the relief portion 52. Moreover, the dimension La of the punched hole 313 in the circumferential direction of the step movement sprocket 310 is approximately the same as the dimension Lc of the relief portion 52 in the circumferential direction of the drive sprocket 13 (see FIG. 7). The dimension La of the punched hole 313 is determined at the middle between the inner edge 313a and the outer edge of the punched hole 313. The dimension La of the punched hole 313 and the dimension Lc of the recess 52 are defined at positions spaced the same distance (radius) from the center of the corresponding sprocket.

[0068] The dimensions La and Lb of the punching hole 313 are such that an operator can insert his / her hand into the space 315 when replacing the bearings 27a and 27b. More specifically, the dimensions La and Lb of the punching hole 313 are such that an operator can insert his / her hand into the space 315 and turn the nut 34 with his / her fingers. The dimension La of the punching hole 313 is preferably 140 mm or more, more preferably 150 mm or more, and even more preferably 160 mm or more. The dimension Lb of the punching hole 313 is preferably 70 mm or more, more preferably 80 mm or more, and even more preferably 90 mm or more.

[0069] According to the passenger conveyor of the second embodiment, in addition to the same effects as those of the first embodiment, the following effects can be obtained. When replacing the bearings 27a, 27b, the worker can loosen the nut 34 that fastens the drive sprocket 13 to the boss 29a with a wrench or the like, and then insert his hand into the above-mentioned space 315 (see FIG. 12) to turn the nut 34 with his fingers. Therefore, even if the space between the drive sprocket 13 and the truss frame 11 is narrow, the worker can efficiently remove the nut 34 from the bolt 33.

[0070] <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 above-mentioned first embodiment in the configuration of the step movement sprocket. FIG. 13 is a front view showing the configuration of a step movement sprocket 320 provided on a passenger conveyor according to the third embodiment. The step movement sprocket 320 shown in Fig. 13 is attached to the boss 29a instead of the step movement sprocket 31a shown in Fig. 3. The step movement sprocket 320 is configured so that it can be replaced without removing the boss 29a from the drive shaft 26. The reason for configuring the step movement sprocket 320 in this manner is as follows.

[0071] For example, if an operator attaches the step movement sprocket 31a shown in FIG. 4 (or the step movement sprocket 310 shown in FIG. 11) to the boss 29a and then fixes the boss 29a to the drive shaft 26 by shrink fitting, the operator will not be able to remove the boss 29a from the drive shaft 26. Even if the operator removes all of the bolts 33 and nuts 34, the step movement sprocket 31a will interfere with the flange portion 42 of the boss 29a, and the operator will not be able to move the step movement sprocket 31a outward. For this reason, even if the operator wants to replace the step movement sprocket 31a for some reason, the operator will not be able to replace the step movement sprocket 31a. Therefore, the replacement work of the step movement sprocket 320 needs to be performed without removing the boss 29a from the drive shaft 26.

[0072] The configuration of the step movement sprocket 320 will be described in detail below. 13, the step movement sprocket 320 has a plurality of second fitting protrusions 321 and a plurality of second clearance portions 322. The plurality of second fitting protrusions 321 are formed integrally with the step movement sprocket 320. The plurality of second fitting protrusions 321 are formed in a state of protruding from the outer periphery side of the step movement sprocket 320 toward the inner periphery side (the center of the step movement sprocket 320).

[0073] The protruding end faces 321a of the second fitting protrusions 321 are curved in an arc shape along the second virtual circle 323. The protruding end faces 321a of the second fitting protrusions 321 are end faces located radially inward of the step movement sprocket 320, and may be referred to as inner end faces of the second fitting protrusions 321. The second virtual circle 323 is a circle (a perfect circle) having a common center with the step movement sprocket 320. The diameter of the second virtual circle 323 is the same as the diameter φDb (mm) of the virtual circle 53 of the drive sprocket 13 shown in FIG. 7. The diameter of the second virtual circle 323 is equal to the distance between the protruding end faces 321a of the two second fitting protrusions 321 facing each other on the virtual center line passing through the center of the step movement sprocket 320. As a result, when the multiple second fitting protrusions 321 are fitted into the cylindrical portion 41 (second cylindrical portion 41b) of the boss 29a, a small gap is formed between the outer circumferential surface of the cylindrical portion 41 and the tip surface 321a of each of the second fitting protrusions 321. Therefore, the worker can rotate the step movement sprocket 320 in the circumferential direction of the boss 29a using the outer circumferential surface of the cylindrical portion 41 of the boss 29a as a guide surface. In addition, the worker can move the step movement sprocket 320 in the central axial direction of the boss 29a using the outer circumferential surface of the cylindrical portion 41 as a guide surface.

[0074] In this embodiment, as an example, six second fitting protrusions 321 and six second recesses 322 are provided in the circumferential direction of the step movement sprocket 320. In this case, the six second fitting protrusions 321 are arranged at an angular pitch of 60° in the circumferential direction of the step movement sprocket 320. In the circumferential direction of the step movement sprocket 320, the second fitting protrusions 321 and the second recesses 322 are arranged alternately so as to be adjacent to each other. Therefore, the multiple (six in the illustrated example) second recesses 322 are arranged at the same angular pitch as the multiple second fitting protrusions 321.

[0075] Further, the step movement sprocket 320 is provided with a plurality of fixing holes 324. The fixing holes 324 are holes for fixing the step movement sprocket 320 to the boss 29a. Specifically, the fixing holes 324 are holes for fixing the second fitting protrusion 321 of the step movement sprocket 320 to the flange portion 42 of the boss 29a. For this reason, one fixing hole 324 is provided for each second fitting protrusion 321. The plurality of fixing holes 324 (six in this embodiment) are arranged around the second imaginary circle 323. Each fixing hole 324 is provided in a state penetrating the second fitting protrusion 321 of the step movement sprocket 320 in the thickness direction. The inner diameter (diameter) of the fixing holes 324 in the step movement sprocket 320 is the same as the inner diameter of the fixing holes 54 in the drive sprocket 13 described above. In addition, the fixing holes 324 are provided at the same angular pitch as the second fitting protrusions 321. The number, positions and pitch circle diameter of the fixing holes 324 in the step movement sprocket 320 are the same as the number, positions and pitch circle diameter of the fixing holes 54 in the drive sprocket 13 described above.

[0076] The second recesses 322 are formed to avoid interference with the flanges 42 of the boss 29a when replacing the step movement sprocket 320. The second recesses 322 are formed radially outward from the second imaginary circle 323. The second recesses 322 are formed in a petal shape. Each of the second recesses 322 communicates with the space surrounded by the second imaginary circle 323. Each of the second recesses 322 is formed by removing a portion of the step movement sprocket 320.

[0077] FIG. 14 is a diagram showing an arrangement state when a step movement sprocket 320 is attached to a boss 29a in the passenger conveyor according to the second embodiment. 14, the multiple second fitting protrusions 321 of the step movement sprocket 320 are fitted into the cylindrical portion 41 (second cylindrical portion 41b) of the boss 29a. The boss 29a and the step movement sprocket 320 are aligned so that the sprocket fixing holes 44 of the flange portion 42 and the fixing holes 324 of the second fitting protrusions 321 are concentrically overlapping (placed at the same position). In this positioning state, the step movement sprocket 320 is attached to the boss 29a together with the drive sprocket 13 using multiple bolts 33 and multiple nuts 34.

[0078] [Step movement sprocket replacement procedure] Here, a procedure for replacing the step movement sprocket 320 attached to the boss 29a will be described. The step movement sprocket 320 can be replaced without removing the boss 29a from the drive shaft .

[0079] First, the worker removes the bolts 33 and nuts 34, and then moves the step movement sprocket 320 inward (toward the middle part P in the longitudinal direction of the drive shaft 26). Next, the worker rotates the drive sprocket 13 appropriately, and then moves the drive sprocket 13 inward. Next, the worker rotates the drive shaft 26 in a horizontal plane. Next, the worker removes the bearing holders 28a, 28b from the drive shaft 26. The procedure up to this point is the same as the bearing replacement procedure described above.

[0080] Next, with the multiple fitting protrusions 51 of the drive sprocket 13 fitted into the cylindrical portion 41 of the boss 29a, the worker appropriately rotates the drive sprocket 13 to align each of the recesses 52 of the drive sprocket 13 with each of the flange portions 42 of the boss 29a in the circumferential direction of the boss 29a, as shown in Fig. 10. Next, the worker removes the drive sprocket 13 from the boss 29a by moving the drive sprocket 13 outward (to the side away from the intermediate portion P in the longitudinal direction of the drive shaft 26).

[0081] Next, the worker rotates the step movement sprocket 320 appropriately while fitting the second fitting protrusions 321 of the step movement sprocket 320 into the cylindrical portion 41 of the boss 29a, thereby aligning the second recesses 322 of the step movement sprocket 320 with the flanges 42 of the boss 29a in the circumferential direction of the boss 29a, as shown in FIG. 15. FIG. 15 shows the step movement sprocket 320 rotated 30° clockwise or counterclockwise from the state shown in FIG. 14. In this case, when viewed from the central axis direction of the boss 29a, the flanges 42 of the boss 29a are disposed within the space formed by the second recesses 322 of the step movement sprocket 320. This allows the step movement sprocket 320 to move outward from the flanges 42 (toward the side away from the intermediate portion P in the longitudinal direction of the drive shaft 26) without interfering with the flanges 42.

[0082] Therefore, the worker can remove the step movement sprocket 320 from the boss 29a by moving the step movement sprocket 320 outward. Also, the worker can attach, for example, a new step movement sprocket 320 together with other parts to the boss 29a by reversing the above-mentioned procedure.

[0083] In the third embodiment, the second recesses 322 are formed with a predetermined dimension corresponding to the recesses 52. The technical meaning of the predetermined dimension is the same as the technical meaning of the predetermined dimension applied to the punched hole 313 in the second embodiment. Therefore, the second recess 322 formed in the step movement sprocket 320 is also a portion where an operator can insert his / her hand from inside to outside through the second recess 322 of the step movement sprocket 320 and the recess 52 of the drive sprocket 13. This allows an operator to insert his / her hand into the space formed at the position where the second recess 322 of the step movement sprocket 320 and the recess 52 of the drive sprocket 13 overlap, and turn the nut 34 with his / her fingers.

[0084] As an application example of the third embodiment, even if boss 29b has a configuration similar to that of boss 29a and a step movement sprocket 320 is attached to boss 29b instead of step movement sprocket 31b, step movement sprocket 320 can be removed from boss 29b and replaced.

[0085] <Modifications, etc.> The present invention is not limited to the above-described embodiment, but includes various modified examples. For example, in the above-described embodiment, the contents of the present invention are described in detail to make it easier to understand, but the present invention is not necessarily limited to having all the configurations described in the above-described embodiment. Also, it is 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. Also, it is possible to delete a part of the configuration of each embodiment, add another configuration, or replace it with another configuration.

[0086] For example, in the above-described embodiment, it is assumed that the drive shaft 26 is rotated in a horizontal plane for the purpose of replacing parts such as the bearings 27a, 27b and the step movement sprocket 320. However, the present invention is also effective in cases where the drive shaft 26 is rotated in a horizontal plane for purposes other than part replacement. [Explanation of symbols]

[0087] 10... passenger conveyor, 13... drive sprocket, 26... drive shaft, 41... cylindrical portion, 42... flange portion, 51... mating projection, 52... relief portion, 53... virtual circle, 310, 320... step movement sprocket, 313... punch hole, 321... second mating projection, 322... second relief portion, P... intermediate portion

Claims

1. A drive shaft; A boss that rotates integrally with the drive shaft; a drive sprocket attached to the boss; the boss has a cylindrical portion into which the drive sprocket is fitted, and a plurality of flange portions which are divided in the circumferential direction of the boss and to which the drive sprocket is fixed and fitted to the cylindrical portion, The drive sprocket has a plurality of fitting protrusions that are fixed to the flange portion in a state where the drive sprocket is fitted to the cylindrical portion, and a plurality of relief portions for avoiding interference with the plurality of flange portions. Passenger conveyor.

2. the end faces of the plurality of fitting protrusions are curved in an arc shape along an imaginary circle having a common center with the drive sprocket, The outer diameter of the cylindrical portion is smaller than the diameter of the imaginary circle.

2. A passenger conveyor as claimed in claim 1.

3. a step movement sprocket attached to the boss with the flange portion sandwiched between the step movement sprocket and the drive sprocket, The step movement sprocket has a plurality of holes formed with a predetermined dimension corresponding to the plurality of recesses.

2. A passenger conveyor as claimed in claim 1.

4. a step movement sprocket attached to the boss with the flange portion sandwiched between the step movement sprocket and the drive sprocket, The step movement sprocket has a plurality of second fitting protrusions that are fixed to the flange portion in a state where the step movement sprocket is fitted to the cylindrical portion, and a plurality of second relief portions for avoiding interference with the plurality of flange portions.

2. A passenger conveyor as claimed in claim 1.

5. The second recesses are formed to have a predetermined dimension corresponding to the recesses. A passenger conveyor as claimed in claim 4.

Images