JP7337899B2 - tension adjuster - Google Patents

Description

Embodiments of the present invention relate to a tensioning device for adjusting the tension of a handrail.

Tension adjusting devices are generally known for adjusting the tension of moving handrails in passenger conveyors such as escalators, autoroads and the like.
Some of such tension adjusting devices constantly apply a pressing force to the moving handrail to apply tension, and notify when a predetermined tension range is exceeded. When the tension exceeds the predetermined tension range, maintenance is performed such that the tension adjustment device is reset.
On the other hand, if a force acting in the opposite direction to the direction of travel is applied to the moving handrail due to a load or mischief applied when a passenger puts his or her hand on it, or if the moving handrail has shrunk due to deterioration over time, tension from the moving handrail will increase. The load acting on the adjusting device becomes excessive. In the case of a conventional tension adjusting device that only allows downward movement, even if the moving handrail shrinks due to aging, it does not allow upward movement, so the load on the moving handrail increases and the moving handrail becomes weaker. shorten life. Conversely, if the rollers, etc. that apply tension to the handrail are not fixed, the roller position will move upward due to mischief, etc., and the handrail will be fed more, resulting in slack in the handrail. There was an inconvenience of putting it away.
On the other hand, if the pressing force applied to the moving handrail is too small, the moving handrail will be slack and bent, or it will rub against the guide rail that guides the moving handrail, resulting in severe wear.
Therefore, there is a problem that it takes time and effort to perform maintenance by resetting the pressing force of the tension adjusting device and removing the slackness of the moving handrail.
Furthermore, in the prior art, methods are known that use expensive devices such as acoustic detection means and moving push guides, which increases costs.

JP-A-2006-8388 Japanese Utility Model Laid-Open No. 63-180688

Under these circumstances, there is a demand for a tension adjusting device that can maintain an optimum pressing force for a long period of time and that can prevent the handrail from sagging when a sudden impact force acts during driving.

Therefore, the present invention provides a tension adjusting device capable of maintaining an optimum pressing force for a long period of time and preventing slackening of the moving handrail when a sudden impact force acts during driving.

An embodiment is a tension adjusting device that is arranged on an endless moving handrail provided on a passenger conveyor that conveys passengers and adjusts the tension of the moving handrail. a roller, a roller supporting member that horizontally protrudes and supports the roller and is vertically movable with respect to the substrate, and biases the roller supporting member downward with a biasing force within a predetermined range. a first urging member that engages, a locked portion provided on the base plate, and a locking portion provided on the roller support member; a lock mechanism for restricting movement of the roller support member; an engaged portion provided on the substrate below the locking portion; and an engagement provided on the roller support member below the locking portion. and a swinging mechanism having a portion, and when receiving upward tension from the roller that exceeds the biasing force of the first biasing member within the predetermined range, the swinging mechanism on the lower side has the above-mentioned The tension adjusting device in which the engaging portion engages with the engaged portion and serves as a swinging fulcrum, and the roller support member swings so that the locking portion locks the locked portion in the lock mechanism on the upper side. is.

In the passenger conveyor according to the first embodiment, FIG. FIG. 2 is a front view of the tension adjusting device shown in FIG. 1; It is drawing which shows the tension|tensile_strength adjustment apparatus shown in FIG. 2, (a) is a side view seen from A arrow in FIG. 2, (b) is BB sectional drawing shown in FIG. It is a BB cross-sectional view of the tension adjustment device shown in FIG. 2, (a) is a diagram showing a state in which normal tension is generated during the downward operation, (b) is a state in which excessive tension is generated It is a figure which shows. It is a schematic diagram of the tension adjustment device according to the second embodiment, (a) is a diagram showing a state in which normal tension is generated in each roller during the downward operation, (b) from the state of (a) It is a figure which shows the state which excessive tension produced, and (c) is a figure which shows the state which the tension of the moving handrail has disappeared. It is a schematic diagram which extracts and shows the rocking|swiveling mechanism of the tension|tensile_strength adjustment apparatus which concerns on 3rd Embodiment. It is a mimetic diagram showing roughly the tension adjustment device concerning a 4th embodiment.

The tension adjusting device and the passenger conveyor according to the embodiment will be described below. First, the passenger conveyor provided with the tension adjusting device 7 according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG.
The passenger conveyor is an escalator, for example, installed at an angle between upper and lower floors of a building.
As shown in FIG. 1, in the moving handrail driving device 1, the endless moving handrail 3 is driven to circulate in synchronism with the movement of the steps (not shown) of the passenger conveyor.

In the moving handrail driving device 1, the moving handrail 3 is wound around the driving device 5a and sandwiched between the driving pulley 5b and the pressing roller 5c. By rotating the driving pulley 5b in a predetermined direction, the moving handrail 3 runs due to the frictional force between the driving pulley 5b and the moving handrail 3. - 特許庁
The moving handrail 3 has a C-shaped cross section, has a main body made of rubber, and a canvas provided integrally with the main body, and a steel core wire is embedded in the main body. A portion where the handrail 3 travels with the C-shaped opening facing downward so that the passenger can hold the handrail 3 is called the outbound side. Also, the part where the moving handrail 3 is reversed and the moving handrail 3 travels with the opening facing upward is called the return route side.
The moving handrail 3 is driven along guide rails (not shown). In FIG. 1, a guide rail is installed on the forward path side from the X section to the Y section counterclockwise in the figure.
A driving lower guide roller 5d and a driving upper guide roller 5e are installed before and after the driving device 5a (before and after the traveling direction of the moving handrail 3, the same shall apply hereinafter), and when the moving handrail 3 enters the driving device 5a, , smoothly deformed without bending at sharp angles. A slack removing portion 5f is provided at the lower portion of the moving handrail 3 on the return route side. A tension adjusting device 7 for adjusting the tension of the handrail 3 is provided in the slack removing part 5f, and by applying a downward pressure force to the moving handrail 3 in FIG. Absorbs slack.
A slack-removing lower guide roller 5g and a slack-removing upper guide roller 5h are installed in front of and behind the slack-removing portion 5f, so that the moving handrail 3 is smoothly deformed when entering the slack-removing portion 5f. there is
A two-dot chain line 6 shown between the lower boarding deck 5j and the upper boarding deck 5k on the return side of the moving handrail 3 indicates the trajectory of the step.

(First embodiment)
Next, the tension adjusting device 7 according to the first embodiment will be described.
As shown in FIGS. 2 and 3, the tension adjusting device 7 includes a base plate 9, rollers 13, 13 that contact the moving handrail 3, and roller supports that are vertically movable with respect to the base plate 9 and support each roller 13. a member 15, two first biasing members 19, 19 for biasing the roller support member 15 against the substrate 9 with a predetermined pressing force, a lock mechanism 17 for restricting movement of the roller support member 15, and a roller support. A rocking mechanism 21 forming a rocking fulcrum of the member 15 and movement restricting mechanisms 23 , 23 restricting the movement of the roller support member 15 are provided.

The substrate 9 is a plate material formed in a substantially rectangular shape when viewed from the front, and is fixed to a truss member (body: not shown).

The rollers 13, 13 are arranged side by side with an interval in the moving direction of the moving handrail 3 (horizontal direction in FIG. 2). Each roller 13 has the same structure, and a support shaft 14 is horizontally projected from the roller support member 15 and fixed to the roller support member 15 (see FIG. 3).

As shown in FIG. 3 , the first biasing members 19 , 19 are coil springs having a central axis 20 , with their upper ends in contact with the substrate 9 and their lower ends in contact with the roller support member 15 . The first urging members 19, 19 are attached in a compressed state relative to their natural length. The first urging members 19 , 19 always urge the roller support member 15 downward with respect to the substrate 9 with an urging force within a predetermined range. It is preferable that the center axis 20 of each first biasing member 19 and the center line 13a in the width direction of each roller 13 are close to each other in a side view. Therefore, it is easy to design.

The locking mechanism 17 is composed of a locked portion 17 b provided on the substrate 9 and a locking portion 17 a provided on the roller support member 15 . The locking portion 17a is locked to the locked portion 17b, thereby restricting the vertical movement of the roller support member 15. As shown in FIG.
The engaged portion 17b has a plurality of projections 18a on the upper and lower sides, and is fixed to the front surface of the substrate 9. As shown in FIG.
The locking portion 17a is L-shaped in a side view, and has a claw 27 projecting toward the locked portion 17b. The claws 27 of the locking portion 17a can be engaged with and disengaged from the concave portions between the plurality of convex portions 18a of the locked portion 17b.

The rocking mechanism 21 is composed of an engaged portion 21b provided below the engaged portion 17b on the substrate 9 and an engaging portion 21a provided below the engaging portion 17a on the roller support member 15. It is
The engaged portion 21 b has a plurality of projections 22 a above and below and is fixed to the front surface of the substrate 9 .
The engaging portion 21a projects obliquely upward in a side view, and a claw 29 projecting toward the engaged portion 21b is formed at the tip. The claws 29 of the engaging portion 21a can be engaged and disengaged between the plurality of protrusions 22a of the engaged portion 21b, and are inclined with their tips upward. The engaging portion 21a is an elastic body made of, for example, spring steel.

As shown in FIGS. 2 and 3A, the movement restricting mechanism 23 is composed of a movement restricting portion 23a provided on the substrate 9 and a movement restricted portion 23b provided on the roller support member 15. It is
The movement restricting portion 23 a is the edge of the elongated hole 24 in the vertical direction, and the movement restricted portion 23 b is a shaft member inserted through the elongated hole 24 .

A force acting on the tension adjusting device 7 according to the first embodiment will be described.
(Down operation state of moving handrail 3)
As shown in FIG. 4 , each first biasing member 19 applies a downward biasing force F<b>1 to the substrate 9 to the roller support member 15 . In contrast, during operation of the handrail 3, each roller 13 exerts a normal upward tension force F2 on the roller support member 15 received from the handrail 3. As shown in FIG.

In this case, as shown in FIG. 4( a ), the rollers 13 receive tension F2 from the moving handrail 3 that exceeds the initial biasing force F1 applied by the first biasing member 19 , and the roller support member 15 is A tension force F2 is applied.
At this time, the rocking mechanism 21 forms the rocking fulcrum 21c of the roller support member 15 by engaging the engaging portion 21a and the engaged portion 21b. That is, when the tension F2 received from each roller 13 becomes larger than the biasing force F1 applied from each first biasing member 19, the engaging portion 21a engages with the engaged portion 21b, The contact portion with the portion becomes the swing fulcrum 21c.
The roller support member 15 swings in the direction of the arrow R around the swing fulcrum 21c. Specifically, the distance L2 between the center line 13a of the roller 13 and the swing fulcrum 21c and the rotational moment generated by the tension F2 (vertical component of F2×L2) When the distance L1 between the rocking fulcrum 21c and the rotational moment (F1×L1) generated by the urging force F1 becomes larger, the roller support member 15 moves in the direction of the arrow R about the rocking fulcrum 21c. swing.
When the roller support member 15 swings, the engaging portion 17a of the locking mechanism 17 engages the engaged portion 17b. As a result, the lock mechanism 17 is actuated, and the movement of the roller support member 15 in the vertical direction can be restricted.

On the other hand, as shown in FIG. 4(b), when an overload is applied to the tension adjusting device 7 by a passenger or the like through the moving handrail 3 while the moving handrail 3 is in operation, for example, when a passenger gets on the passenger conveyor. When getting off, a sudden overload may act on the moving handrail 3 due to mischief such as excessively clinging to the moving handrail 3 or pulling the moving handrail 3. - 特許庁Similarly, even in a state in which the handrail 3 has shrunk due to deterioration over time, an overload may be applied to the handrail 3 during the descent operation.

The tension F2' that each roller 13 receives from the moving handrail 3 in this case is sufficiently larger than the normal tension F2 during the descent operation. When the excessive tension F2' is generated, the distance between the contact portion between the locking portion 17a and the locked portion 17b and the center line 13a of the roller 13 and the rotational moment generated by the tension F2' increase, and the roller The support member 15 rotates, and the engaging portion 21a separates from the engaged portion 21b. That is, the swing mechanism 21 is released. However, since the lock mechanism 17 is in operation, the vertical movement of the roller support member 15 is restricted.

As described above, when an overload is applied to the tension adjusting device 7 by a passenger or the like through the moving handrail 3, the vertical movement of the roller supporting member 15 is restricted, so that the roller supporting member 15 is suddenly released. It is possible to prevent the slack of the moving handrail 3 from moving to the drive wheel side due to the rising.

(In the case of ascending operation or stopping after descending operation of the moving handrail 3)
The tension applied to each roller 13 from the moving handrail 3 is almost zero when the moving handrail 3 is in ascending operation and stopped. Therefore, as shown in FIG. 3B, in the locking mechanism 17, the locked portion 17b and the locking portion 17a are separated from each other. That is, the lock mechanism 17 is in a non-operating state.
In this state, the tension adjusting device 7 keeps the magnitude of the load acting on the moving handrail 3 within a predetermined range.
Specifically, each first biasing member 19 presses the roller support member 15 against the substrate 9 with a biasing force F1 (see FIG. 4), thereby applying a load to the moving handrail 3 via each roller 13. Granted. If each first urging member 19 has a small spring constant and a sufficiently long free length, the magnitude of the load applied to the handrail 3 from each roller 13 can be ) can be almost constant.
When the moving handrail 3 expands and contracts, the roller support member 15 moves upward or downward with respect to the substrate 9 together with the roller 13, and the biasing force F1 applied from the first biasing member 19 and the It is automatically adjusted to a position where the tension received from the moving handrail 3 is balanced. In addition, since the claw 29 of the engaging portion 21a is inclined with the tip upward, the roller support member 15 can move downward.
However, the movement of the roller support member 15 in the vertical and horizontal directions in a side view is restricted by a movement restriction mechanism 23 so as to prevent the roller support member 15 from becoming unable to return due to an abnormal posture (Fig. 3). Further, since the roller support member 15 is sandwiched between the movement restricting portions 23a, movement in the left-right direction (moving direction of the moving handrail 3) in a front view is also restricted (see FIG. 2). The abnormal state referred to here is, for example, the case where the roller support member 15 is extremely separated from the substrate 9 in the left-right direction in a plan view, or is extremely distant from the substrate 9 .

Further, in the state where the lock mechanism 17 is not operated as described above, the engaging portion 21a is positioned between the convex portions 22a, 22a or is in contact with the tip of the convex portion 22a. Therefore, when the downward operation is started, the engaging portion 21a and the engaged portion 21b can be easily engaged.

In FIG. 1, the moving handrail 3 moves in the opposite direction of the arrow in ascending operation. In this case, when a sudden overload acts on the moving handrail 3 on the forward side, the tension adjusting device 7 applies a force in the loosening direction from the moving handrail 3, so the tension acting on each roller 13 is negative (or zero). ). In this case, there is no significant slack in the upper drive guide roller 5e (see broken line in FIG. 1), so there is no problem.

Effects of the first embodiment will be described.
As shown in FIGS. 2 and 3, the roller support member 15 is in a movable state with respect to the substrate 9, and the first biasing member 19 directs the roller support member 15 downward with a predetermined biasing force F1 ( 4A), each roller 13 supported by the roller support member 15 applies a predetermined load to the moving handrail 3. As shown in FIG. In addition, when the roller support member 15 moves up and down to a position where the tension of the moving handrail 3 and the biasing force F1 of the first biasing member 19 are balanced during stoppage or ascending operation, the load is applied to the moving handrail 3. can be automatically adjusted.
As shown in FIG. 4(a), when each roller 13 receives a tension F2 from the moving handrail 3 that exceeds the initial biasing force F1 of the first biasing member 19, the swing mechanism 21 causes the distance L2 and the tension F2. The rotational moment generated by the vertical component becomes larger than the rotational moment generated by the distance L1 and the biasing force F1, and the engaging portion 21a swings with the contacting portion of the engaged portion 21b as the swinging fulcrum 21c. When the roller support member 15 swings, the locking portion 17a is locked to the locked portion 17b in the lock mechanism 17, and the lock mechanism 17 operates to prevent the roller support member 15 from moving up and down. can. As a result, even when excessive tension F2' (see FIG. 4(b)) is generated, the roller support member 15 moves upward more than necessary, resulting in an increase in the feed amount of the moving handrail 3. Also, it is possible to prevent damage to the moving handrail 3 due to deflection (see the broken line shown in FIG. 1) occurring near the driving upper guide roller 5e.
As described above, according to the tension adjusting device according to the first embodiment, it is possible to maintain the optimum pressing force for a long period of time and prevent damage to the moving handrail 3 due to excessive slack.

As shown in FIG. 3, the movement restricting mechanism 23 includes a movement restricting portion 23a provided on the front surface of the substrate 9 and a movement restricted portion 23b provided on the roller supporting member. As a result, it is possible to restrict the movement of the roller support member in the vertical and horizontal directions in a side view and the movement direction of the handrail 3, so that the direction of the biasing force F1 and the direction of the tension F2 can be maintained substantially in the vertical direction.

The engaged portion 17b and the engaged portion 21b each have a plurality of convex portions 18a and 22a. As a result, even when the tension received from the moving handrail 3 increases due to deterioration over time and the equilibrium position between the biasing force F1 in the roller support member 15 and the tension received from the moving handrail 3 increases, the lock mechanism is maintained. 17 can be activated. In other words, even if the position of the roller support member 15 is moved due to deterioration of the moving handrail 3 over time, the tension adjusting device 7 can continue to maintain the optimum pressing force.

In the swinging mechanism 21, when the excessive tension F2 is not acting on the moving handrail 3, the engaging portion 21a is located in the concave portion between the convex portions 22a, 22a or is in contact with the tip of the convex portion 22a. . Therefore, when excessive tension F2 acts on the moving handrail 3, the engaging portion 21a and the engaged portion 21b are easily engaged, and the roller support member 15 swings, thereby stably locking the lock mechanism 17. can be operated to
The engaging portion 21a is an elastic body and can be bent when engaged with the engaged portion 21b. This facilitates the movement of the engaging portion 21a over the engaged portion 21b.

When the first biasing member 19 is a coil spring, mounting the first biasing member 19 in a state compressed from its natural length facilitates mounting of the first biasing member 19 and adjustment of the biasing force F1. Specifically, by setting the appropriate value when the first biasing member 19 is compressed by a predetermined amount, for example, about 1 mm, the work time for adjusting the biasing force F1 on site can be shortened.

Another embodiment of the present invention will be described below. In the following description, the main differences from the first embodiment will be described.

(Second embodiment)
A tension adjusting device according to the second embodiment will be described.
As shown in FIG. 5, in the swinging mechanism 21, the convex portion 22a of the engaged portion 21b has an inclined surface 28 facing the engaging portion 21a, and the inclined surface 28 faces the roller support member 15 downward. It is different from the first embodiment in that the Other configurations are the same as those of the first embodiment.

The movement of the tension adjusting device 7 according to the second embodiment will be described.
As shown in FIG. 5(a), when the tension F2 of the moving handrail 3 exceeding the biasing force F1 of the first biasing member 19 acts, the engaging portion 21a and the first convex portion 30 of the engaged portion 21b are pulled together. A swing fulcrum 21c is formed by engagement, and a rotational moment (vertical component of F2×L2>F1×L1) around the swing fulcrum 21c causes the roller support member 15 to swing. It is locked to the locked portion 17b.
As shown in FIG. 5(b), when an excessive tension F2' is generated by mischief or the like, the engaging portion 17a shifts from the state of FIG. Move upwards in pitch. The engaging portion 21 a moves above the first convex portion 30 .
As shown in FIG. 5(c), when the tension F2' changes to approximately 0 due to the rising or stopping operation after the descending operation, the lock mechanism 17 is released, and the roller support member 15 maintains the balance between the tension and the biasing force F1. position (automatically adjusted). Specifically, the end of the engaging portion 21a on the side of the engaged portion 21b moves from the position above the first convex portion 30 of the engaged portion 21b indicated by the two-dot chain line to the engaged portion 21b indicated by the solid line. can be slid downward along the inclined surface 28 to a position below the .

Effects of the second embodiment will be described.
As shown in FIG. 5, in the swinging mechanism 21, the convex portion 22a of the engaged portion 21b has an inclined surface 28 facing the engaging portion 21a, which is inclined with the roller support member 15 side facing downward. Since the engaging portion 21a can easily move along the inclined surface 28 of the convex portion 22a of the engaged portion 21b, it is easy to automatically adjust the position of the roller support member 15 at the time of stopping and during the ascending operation. Specifically, when the tension applied to each roller 13 from the moving handrail 3 changes from the tension F2' to approximately 0, the engaging portion 21a can move along the inclined surface .

(Third embodiment)
A third embodiment will be described.
As the engaging portion 21a is indicated by a solid line and a two-dot chain line in FIG. 6, the engaging portion 21a is provided so as to be retractable with respect to the engaged portion 21b.
That is, the engaging portion 21a is rotatably attached to the shaft X via the mounting member 15b, and is biased to protrude by the second biasing member 15a provided on the shaft X. As shown in FIG. The second biasing member 15a is, for example, a torsion coil spring.
However, the second biasing member 15a maintains the protruding state when the tension F2 (see FIGS. 4 and 5) of the moving handrail 3 due to the downward operation is applied to the roller supporting member 15, The urging force is set so that it sinks when tension F2', which is a large load, is generated.

According to the third embodiment, when excessive tension F2' is applied to the roller support member 15, the roller support member 15 moves upward within the range of the pair of projections 18a of the upper engaged portion 17b. However, the engaging portion 21a rotates in the direction of the arrow R1 and moves upward while sinking toward the roller support member 15 side. As a result, it is possible to suppress the concentration of the load on the engaging portion 21a and the engaged portion 21b, thereby preventing damage to the engaging portion 21a and the engaged portion 21b.

(Fourth embodiment)
A fourth embodiment will be described.
As shown in FIG. 7, the tension adjusting device 7 further includes a holding member 31 having one end attached to the movement restricting portion 23b and the other end attached to the front surface of the substrate 9 in the second embodiment. there is The holding member 31 is an elastic body, is attached in a state of being extended beyond its natural length, and applies an urging force F3 in a direction in which the roller supporting member 15 and the substrate 9 are brought closer to each other.

In the tension adjusting device 7 according to the fourth embodiment, the engagement between the engaging portion 21a and the engaged portion 21b of the swing mechanism 21 is held by the biasing force F3 applied from the holding member 31 to the roller support member 15. do. That is, according to the fourth embodiment, by maintaining the engagement between the engaging portion 21a and the engaged portion 21b, it is possible to reliably operate the lock mechanism 17 when the downward operation is started. .
In addition, it prevents the engagement between the engaging portion 17a and the engaged portion 17b of the locking mechanism 17 from being released at unintended timing. This prevents the lock mechanism 17 from being released at unintended timing and the roller support member 15 from moving upward.

The above-described embodiments are provided as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. Embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.
For example, each first biasing member is not limited to a coil spring, and may be, for example, a weight that applies a predetermined weight as biasing force.

7 Tension adjusting device 9 Substrate 13 Roller 15 Roller supporting member 17 Locking mechanism 17a Locking portion 17b Locked portion 19 First biasing member 21 Swing Mechanism 21a Engaging portion 21b Engaged portion 21c Rocking fulcrum 18a, 22a Convex portion 23 Movement limiting mechanism 23a Movement limiting portion 23b Movement limiting portion 28 Inclination Surface 31... Holding member, F1, F3... Biasing force, F2... Tension.

Claims (7)

A tension adjusting device that is arranged on an endless moving handrail provided on a passenger conveyor that conveys passengers and adjusts the tension of the moving handrail,
A substrate fixed to the frame,
a roller contacting the moving handrail;
The roller is supported by protruding in a horizontal direction, and is arranged to face the substrate with a gap, and is movable in the vertical direction with respect to the substrate and in the direction away from or toward the substrate. a member;
a first biasing member that biases the roller support member downward with a biasing force within a predetermined range;
An engaging portion provided on the base plate and an engaging portion provided on the roller supporting member facing the engaging portion, and the engaging portion engages the engaging portion. a lock mechanism for restricting the movement of the roller support member with
An engaged portion provided on the substrate below the engaged portion , and an engaging portion provided opposite to the engaged portion on the roller supporting member provided below the engaging portion. and a swing mechanism having a joint,
The engaged portion and the engaged portion are each provided within a predetermined range in the vertical direction, and the engaging portion is movable downward along the engaged portion,
In the rocking mechanism, the engaging portion engages the engaged portion when the roller is subjected to upward tension from the moving handrail exceeding the urging force of the first urging member within the predetermined range. The roller support member swings in the direction in which the locking portion approaches the locked portion , and the locking portion locks the locked portion in the lock mechanism. Tension adjuster. a movement restricting mechanism including a movement restricting portion provided on the substrate for restricting the movement range of the roller support member and a movement restricted portion provided on the roller support member;
3. The movement limiting mechanism limits the movement range in the vertical direction of the roller support member , the alignment direction of the substrate and the roller support member, and the movement direction of the moving handrail to a range in which the roller support member can return. 1. The tension adjusting device according to 1. the engaged portion and the engaged portion each have a plurality of upper and lower projections,
The engaging portion engages between the convex portions of the engaged portion,
The tension adjusting device according to claim 1 or 2, wherein the locking portion is locked between the convex portions of the locked portion. 4. The tension adjusting device according to claim 3, wherein said engaging portion is an elastic body and is flexible when engaged with said engaged portion. the convex portion of the engaged portion has an inclined surface facing the engaging portion and having an upper surface inclined with the roller support member side downward;
4. The tension adjusting device according to claim 3, wherein the engaging portion is movable downward along the inclined surface while contacting the inclined surface when the roller support member descends. 6. The engaging portion is provided so as to be retractable with respect to the engaged portion, and when the roller support member is raised, the engaging portion moves upward while contacting and sinking into the convex portion. A tension adjusting device according to any one of the above. further comprising a holding member that biases the roller support member and the substrate in a direction to bring them closer together;
The tension adjusting device according to any one of claims 1 to 6, wherein the holding member is an elastic body, and biases the engaging portion of the locking mechanism so as to be held in a state where it is engaged with the engaged portion. .

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