Belt tension adjusting tool

Abstract

The invention provides a belt tension adjusting tool, which can easily and accurately adjust the belt tension of a belt used by an elevator door device and the alignment of a belt wheel. The door device of the elevator comprises a door motor which is fixed on a door frame through an adjusting fitting in a position-adjustable manner; a first pulley connected to the door motor; a second pulley fixed to the door frame and connected to an opening / closing mechanism for opening / closing the door of the elevator; and a belt wound between the first pulley and the second pulley. A belt tension adjusting tool is provided with: a main body section disposed between a first pulley and a second pulley; a first arm portion extending from the main body portion toward the groove portion of the first pulley; a second arm portion extending from the main body portion toward the groove portion of the second pulley; and an adjustment mechanism that adjusts the distance between the distal end portion of the first arm portion and the distal end portion of the second arm portion.

Description

Technical Field

[0001] This disclosure relates to a technique for using a tension adjustment tool when adjusting the tension of the drive mechanism of an elevator door. Background Technology

[0002] Patent Document 1 discloses a technique for adjusting the tension of an elevator door drive mechanism. In this technique, with the bolt loosened so that the adjusting bracket with the fixed pulley can move, the housing is tightly engaged with the bolt. Furthermore, the pressing part of the bracket pressing accessory is brought into contact with the adjusting bracket, and the adjusting bracket is moved by rotating the adjusting nut in the tightening direction, thereby adjusting the tension of the main belt.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 10-77181 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In the elevator door drive mechanism of the aforementioned Patent Document 1, the bolt that secures the adjusting bracket to which the pulley is fixed is located directly above the main belt. Therefore, even if the adjusting bracket is moved in the tension direction of the main belt with this bolt as a fulcrum, the impact on the alignment of the pulley is minimal.

[0008] Here, we consider adjusting the belt tension between the pulley of the door motor and the pulley of the drive mechanism. Typically, the bolts securing the adjustment fittings to the door motor are not positioned directly above the belt due to the constraints of the door motor's configuration. Therefore, when considering adjusting the position of the adjustment fittings to the door motor using the technology of Patent Document 1, the following problem arises: the belt tension causes a force acting on the door motor in the direction of deflection with the bolt as a fulcrum, making it difficult to adjust the belt tension while simultaneously adjusting the alignment of the pulleys.

[0009] This disclosure was made to solve the aforementioned problems, and its purpose is to provide a technique for a belt tension adjustment tool that can easily and accurately adjust the belt tension and pulley alignment of the belt used in elevator door devices.

[0010] Methods for solving problems

[0011] The tension adjustment tool disclosed herein is a tension adjustment tool for a door device, the door device comprising: a door motor fixed to the door frame of an elevator in a position-adjustable manner via an adjustment fitting; a first pulley connected to the door motor; a second pulley fixed to the door frame and connected to an opening / closing mechanism for opening and closing the elevator door; and a belt wound between the first pulley and the second pulley. The tension adjustment tool comprises: a main body disposed between the first pulley and the second pulley; a first arm extending from the main body toward a groove of the first pulley; a second arm extending from the main body toward a groove of the second pulley; and an adjustment mechanism that adjusts the distance between the ends of the first arm and the second arm.

[0012] Invention Effects

[0013] According to the technology disclosed herein, by adjusting the adjustment mechanism, the first arm and the second arm can be brought into contact with and lifted by the first pulley and the second pulley, respectively. With this structure, a force against belt tension can be applied to the first and second pulleys disposed on the surrounding track surface of the belt, thus allowing for easy and accurate adjustment of belt tension and pulley alignment. Attached Figure Description

[0014] Figure 1 This is a front view of the elevator door device according to Embodiment 1.

[0015] Figure 2 This is a front view used to illustrate the structure of the drive mechanism of the door device.

[0016] Figure 3 Observing from direction A Figure 2 A top view of the drive mechanism.

[0017] Figure 4 This is the main view used to illustrate the tension adjustment tool.

[0018] Figure 5 This diagram illustrates the setup process for tension adjustment tools in belt tension adjustment operations.

[0019] Figure 6 This diagram illustrates the tension adjustment process in a tension adjustment operation using a tension adjustment tool.

[0020] Figure 7 This diagram illustrates the alignment adjustment process in a tension adjustment operation using a tension adjustment tool.

[0021] Figure 8 This is a diagram illustrating the structure of the tension adjustment tool in Embodiment 2.

[0022] Figure 9This diagram illustrates the setup process for tension adjustment tools in belt tension adjustment operations.

[0023] Figure 10 This is a diagram illustrating a variation of the tension adjustment tool in Embodiment 2.

[0024] Label Explanation

[0025] 1: Door assembly; 2: Door; 3: Opening and closing mechanism; 4: Drive mechanism; 5: Door frame; 6: Suspension component; 7: Suspension roller; 8: Track; 9: Drive pulley; 10: Driven pulley; 11: Belt; 12: Connecting component; 20: Door motor; 22: First pulley; 24: Second pulley; 26: Belt; 30: Adjusting accessory; 32: Bolt; 34: Long hole; 40: Belt tension adjustment tool; 42: Main body; 44: Insertion hole; 46: First adjusting nut; 48: Second adjusting nut; 50: First arm; 52: First contact part; 60: Second arm; 62: Second contact part; 70: Belt tension adjustment tool; 72: Ruler part; 74: Guide component; 741: Base; 742: Insertion part; 743: Protrusion; 744: Fixing screw. Detailed Implementation

[0026] Hereinafter, several embodiments will be described with reference to the accompanying drawings. Furthermore, common elements in all figures will be labeled with the same reference numerals, and repeated descriptions will be omitted.

[0027] Implementation method 1.

[0028] 1-1. Structure of the elevator door device in Embodiment 1

[0029] Figure 1 This is a front view of the elevator door device according to Embodiment 1. The elevator shaft is formed to run through all floors of the building. At each floor, a landing is formed near the shaft. A passenger car is installed in the shaft. A landing entrance / exit is formed between each landing and the shaft. A landing door is installed at each landing entrance / exit. A car entrance / exit is formed on the landing side of the passenger car. A door device 1 is installed at the car entrance / exit. The door device 1 has a door 2, an opening / closing mechanism 3 for opening and closing the door 2, and a drive mechanism 4 for driving the opening / closing mechanism 3.

[0030] Door 2 is configured to open and close the car entrance / exit. Typically, doors 2 are arranged in pairs to open in the center. As another example, doors 2 may also be configured to open from one side.

[0031] A door frame 5 is fixed to the upper part of the car entrance / exit. Various components of the opening / closing mechanism 3 are installed on the door frame. The opening / closing mechanism 3 has a main structure comprising a suspension component 6, a suspension roller 7, a track 8, a drive pulley 9, a driven pulley 10, a belt 11, and a connecting component 12. The suspension component 6 is fixed to the upper part of the door 2. The suspension roller 7 is located above the suspension component 6. The track 8 is located above the door 2 on the door frame 5. The drive pulley 9 is located at one end of the door frame 5 along its length. The driven pulley 10 is located at the other end of the door frame 5 along its length. The belt 11 is arranged to surround the drive pulley 9 and the driven pulley 10. One end of the connecting component 12 is fixed to the upper part of the belt 11. The other end of the connecting component 12 is fixed to one side of the suspension component 6. The other end of the connecting component 12 is fixed to the lower part of the belt 11. The other end of the connecting component 12 is fixed to the other side of the suspension component 6. When the belt 11 reciprocates left and right through the drive mechanism 4, the opening and closing mechanism 3 is guided by the suspension roller 7 traveling on the track 8, and the door 2 reciprocates in the opposite direction to open and close the entrance and exit.

[0032] Figure 2 This is a front view used to illustrate the structure of the drive mechanism of the door device. Figure 3 Observing from direction A Figure 2 The diagram shows a top view of the drive mechanism 4. The drive mechanism 4 includes a door motor 20, a first pulley 22, a second pulley 24, and a belt 26. The first pulley 22 is connected to the rotational shaft of the door motor 20. The second pulley 24 is connected to the rotational shaft of the drive pulley 9. The belt 26 is a V-belt wound around the first pulley 22 and the second pulley 24.

[0033] The door motor 20 is fixed to the door frame 5 in a position-adjustable manner via the adjusting fitting 30. Specifically, the door motor 20 is fixed to the adjusting fitting 30. The adjusting fitting 30 is fixed to the door frame 5 via bolts 32 through elongated holes 34. At this time, the position of the door motor 20 relative to the door frame 5 is adjusted within the range of the elongated holes 34 so that the alignment of the first pulley 22 and the tension of the belt 26 converge within a specified range.

[0034] In such an elevator, when the passenger car is positioned adjacent to a landing, a portion of the passenger car door 2 engages with a portion of the landing door. In this state, the door motor 20 is activated. Through this activation, power is transmitted in the sequence of the first pulley 22, the belt 26, and the second pulley 24, causing the drive pulley 9 to rotate. This rotation moves the belt 11, and the door 2 opens and closes accordingly.

[0035] 1-2. Structure of the tension adjustment tool in Implementation Method 1

[0036] During elevator maintenance work performed by operators, the tension of belt 26 and the alignment of the first pulley 22 are sometimes measured and adjusted. In the following description, this series of operations will be referred to as "belt tension adjustment work." In belt tension adjustment work, bolt 32 needs to be loosened to tension belt 26, and both the tension of belt 26 and the alignment of the first pulley 22 need to be adjusted to the specified range. The tension of belt 26 and the alignment of the first pulley 22 present the following problem: if one value is adjusted, the other value also changes; therefore, operators sometimes need to repeat this work multiple times, resulting in a heavy workload for the operators.

[0037] The tension adjustment tool in this embodiment is an adjustment tool used when performing tension adjustment work. Figure 4 This is a front view used to illustrate the tension adjustment tool. The tension adjustment tool 40 includes a main body 42, a first adjusting nut 46, a second adjusting nut 48, a first arm 50, a first contact part 52, a second arm 60, and a second contact part 62.

[0038] The main body 42 is a hollow cylindrical structure with a through insertion hole 44. The base end of the first arm 50 is inserted into the insertion hole 44 from one end, and the base end of the second arm 60 is inserted from the other end. Furthermore, the insertion hole 44 does not necessarily need to be through. For example, the insertion hole 44 may be configured such that the first insertion hole at the end for inserting the first arm 50 and the second insertion hole at the other end for inserting the second arm 60 are not through, and are each a separate hole.

[0039] The first arm 50 and the second arm 60 are screws with threaded teeth formed at least in the region on the base end side. The first arm 50 and the second arm 60 may also be configured as fully threaded screws.

[0040] The first contact portion 52 is fixed to the end portion of the first arm portion 50. The first contact portion 52 is the portion that contacts the groove of the first pulley 22 and has a shape that bends along the groove of the first pulley 22.

[0041] The second contact portion 62 is fixed to the end portion of the second arm portion 60. The second contact portion 62 is the portion that contacts the groove of the second pulley 24 and has a shape that bends along the groove of the second pulley 24.

[0042] The first adjusting nut 46 is a nut that screws into the base end of the first arm 50. With the first adjusting nut 46 engaged, the first arm 50 is inserted into the insertion hole 44 of the main body 42 from one end. By adjusting the engagement position of the first adjusting nut 46 relative to the first arm 50, the protrusion amount of the first arm 50 protruding from the main body 42 can be adjusted. That is, the first adjusting nut 46 functions as an adjustment mechanism for adjusting the distance between the end of the first arm 50 and the end of the second arm 60.

[0043] The second adjusting nut 48 is a nut that screws into the base end of the second arm 60. With the second adjusting nut 48 engaged, the second arm 60 is inserted into the insertion hole 44 of the main body 42 from the other end. By adjusting the engagement position of the second adjusting nut 48 relative to the second arm 60, the protrusion amount of the second arm 60 protruding from the main body 42 can be adjusted. That is, the second adjusting nut 48 functions as an adjustment mechanism for adjusting the distance between the end of the first arm 50 and the end of the second arm 60.

[0044] 1-3. Sequence of tension adjustment operations using tension adjustment tools

[0045] Next, the sequence of belt tension adjustment using the belt tension adjustment tool 40 will be explained. In the following explanation, the direction of tension of the belt 26 wound between the first pulley 22 and the second pulley 24 will be referred to as the "tension direction," and the direction orthogonal to the tension direction and the horizontal direction will be referred to as the "pressing direction." During the belt tension adjustment, the position of the adjustment accessory 30, to which the door motor 20 is fixed, is adjusted so that the deflection near the center of the upper side of the belt 26 wound between the first pulley 22 and the second pulley 24, when pressed in the pressing direction with a specified load, converges to a specified range. Furthermore, during the belt tension adjustment, the alignment of the first pulley 22 relative to the second pulley 24 is adjusted by adjusting the position of the adjustment accessory 30. The sequence of belt tension adjustment using the belt tension adjustment tool 40 will be explained in detail below.

[0046] 1-3-1. Setting up the tension adjustment tool

[0047] Figure 5 This diagram illustrates the setup process of the tension adjustment tool in a belt tension adjustment operation. In this setup process, the operator adjusts the first adjusting nut 46 and the second adjusting nut 48 so that the first contact portion 52 of the tension adjustment tool 40 contacts the groove of the first pulley 22, and the second contact portion 62 contacts the groove of the second pulley 24.

[0048] 1-3-2. Tension Adjustment Procedure

[0049] Figure 6 This diagram illustrates the tension adjustment process in a tension adjustment operation using a tension adjustment tool. In the tension adjustment process, the operator loosens two bolts 32, allowing the position of the door motor 20 to be adjusted. At this time, the tension applied to the belt 26 is supported by the installed tension adjustment tool 40, thus preventing the door motor 20 from shifting significantly towards the second pulley 24.

[0050] Next, the operator adjusts the first adjusting nut 46 or the second adjusting nut 48 of the belt tension adjusting tool 40 to adjust the belt tension. Typically, when the distance between the first contact portion 52 and the second contact portion 62 is increased by adjusting the first adjusting nut 46 or the second adjusting nut 48, the belt tension of the belt 26 increases, and when the distance between the first contact portion 52 and the second contact portion 62 is shortened, the belt tension of the belt 26 decreases.

[0051] The operator presses the tension gauge G in the pressing direction at the measuring section near the center of the upper side of the belt 26 wound between the first pulley 22 and the second pulley 24. The operator uses a steel ruler or similar tool to measure the deflection of the belt 26 at the measuring section when the measuring load of the tension gauge G reaches the specified load. Furthermore, if the measured deflection does not converge within the specified range, the first adjusting nut 46 or the second adjusting nut 48 is readjusted.

[0052] 1-3-3. Alignment and Adjustment Process

[0053] Figure 7 This diagram illustrates the alignment process in a tension adjustment operation using a tension adjustment tool. In the alignment process, the operator uses a steel ruler S or similar tool to adjust the position of the adjustment accessory 30 to ensure that the axial position and radial orientation of the first pulley 22 relative to the second pulley 24 are aligned, and then tightens the two bolts 32. After or during the alignment process, a tension adjustment process is performed as needed, simultaneously adjusting both the tension and alignment.

[0054] 1-4. Function and Effect of Tension Adjustment Tools

[0055] The tension adjustment tool 40 described above can achieve the following effects and results.

[0056] The belt tension adjustment tool 40 can apply a force against the belt tension between the first pulley 22 and the second pulley 24. Therefore, during belt tension adjustment, the operator does not need to overcome the tension of the belt 26 to maintain the gate motor 20. As a result, the efficiency of belt tension adjustment is improved.

[0057] The tension adjustment tool 40 applies a force against the belt tension between the first pulley 22 and the second pulley 24 disposed on the surrounding track surface of the belt 26. Therefore, compared with the case of holding the door motor 20, it is less likely to produce alignment deviation of the first pulley 22 caused by the tension of the belt 26.

[0058] The first contact portion 52 and the second contact portion 62 each have a structure that bends along the grooves of the first pulley 22 and the second pulley 24, respectively. This structure prevents the tension adjustment tool 40 from falling off.

[0059] 1-5. Variations

[0060] The tension adjustment tool 40 of embodiment 1 can also be modified in the following manner.

[0061] 1-5-1. First contact portion 52 and second contact portion 62

[0062] The shapes of the first contact portion 52 and the second contact portion 62 are not limited. This variation can also be applied to the tension adjustment tool of Embodiment 2 described later.

[0063] 1-5-2. First adjusting nut 46 and second adjusting nut 48

[0064] The first adjusting nut 46 and the second adjusting nut 48 can also be integrally formed with the main body 42. In this case, it is sufficient that the threads of the first arm 50 and the first adjusting nut 46 are in the opposite direction to those of the second arm 60 and the second adjusting nut 48. With this structure, the distance between the first contact portion 52 and the second contact portion 62 can be adjusted by rotating the main body 42, which is integral with the first adjusting nut 46 and the second adjusting nut 48.

[0065] The tension adjusting tool 40 may also be configured to include only either the first adjusting nut 46 or the second adjusting nut 48. That is, for example, if the tension adjusting tool 40 has a position adjustment mechanism based on the first adjusting nut 46, the second arm 60 may not be configured to be able to adjust its position relative to the main body 42. This modification can also be applied to the tension adjusting tool of Embodiment 2 described later.

[0066] 2. Implementation Method 2

[0067] 2-1. Features of the tension adjustment tool in Embodiment 2

[0068] Figure 8 This is a diagram illustrating the structure of the tension adjustment tool in Embodiment 2. Figure 8 In the diagram, (A) is a front view of the tension adjustment tool, and (B) is a diagram illustrating the structure of the guide component as viewed from direction B. Figure 8 In the middle, to and Figure 4 The tension adjustment tools shown have the same structure, are labeled with the same numbers, and descriptions are omitted.

[0069] In addition to the tension adjustment tool 70 in embodiment 2 Figure 4In addition to the structure of the tension adjustment tool 40 shown, it also includes a ruler portion 72 and a guide member 74. The ruler portion 72 has a scale on one side and is rotatably fixed to the main body portion 42 at one end. The ruler portion 72 has a length that extends across the belt 26 to the upper side of the belt 26 when the tension adjustment tool 70 is set in the drive mechanism 4.

[0070] The guide member 74 includes: a cuboid-shaped base 741 with an insertion portion 742 for inserting a ruler portion 72; and a pair of protrusions 743 that protrude from both ends of the base 741 toward the belt 26 when the tension adjustment tool 70 is installed in the drive mechanism 4. The ruler portion 72 is slidably inserted into the insertion portion 742 of the guide member 74 from the other end. The insertion portion 742 has a retaining structure configured to retain the guide member 74 under its own weight while fitting into the ruler portion 72.

[0071] 2-2. Sequence of tension adjustment operation using the tension adjustment tool of embodiment 2

[0072] Next, the sequence of belt tension adjustment operations using the belt tension adjustment tool 70 of Embodiment 2 will be described.

[0073] 2-2-1. Setting up the tension adjustment tool

[0074] Figure 9 This diagram illustrates the setup process of the belt tension adjustment tool during belt tension adjustment operations. In this setup process, the operator adjusts the first adjusting nut 46 and the second adjusting nut 48 so that the first contact portion 52 of the belt tension adjustment tool 40 contacts the groove of the first pulley 22, and the second contact portion 62 contacts the groove of the second pulley 24. At this time, the operator aligns the ruler portion 72 in a direction perpendicular to the belt 26. Furthermore, the first adjusting nut 46 and the second adjusting nut 48 are adjusted so that the position where the ruler portion 72 intersects with the belt 26 is near the center of the straight portion of the belt 26. The guide member 74 is positioned at the initial position where the protrusion 743 contacts the belt from below.

[0075] 2-2-2. Tension Adjustment Process

[0076] Figure 9 This diagram illustrates the tension adjustment process in a tension adjustment operation using the tension adjustment tool of Embodiment 2. In the tension adjustment process, the operator loosens two bolts 32, allowing the position of the door motor 20 to be adjusted. At this time, the tension applied to the belt 26 is supported by the installed tension adjustment tool 70, thus preventing the door motor 20 from shifting significantly towards the second pulley 24.

[0077] Next, the operator adjusts the belt tension by adjusting the first adjusting nut 46 or the second adjusting nut 48 of the belt tension adjustment tool 70. Then, the operator reads the initial position of the guide member 74 from the scale of the ruler 72. Next, the operator presses the tension gauge G in the pressing direction at the measuring section of the belt 26 located between the pair of protrusions 743 until the measured load becomes the specified load. As a result, the guide member 74 is pressed in the pressing direction by the deflected belt 26. The operator reads the movement position of the guide member 74 from the scale of the ruler 72 and measures the change in position from the initial position as the deflection of the belt 26. Furthermore, if the measured deflection does not converge within the specified range, the first adjusting nut 46 or the second adjusting nut 48 is adjusted again. The alignment adjustment process is the same as the process using the belt tension adjustment tool 40 of Embodiment 1.

[0078] 2-3. Function and Effect of the Tension Adjustment Tool in Implementation Method 2

[0079] The tension adjustment tool 70 described above can achieve the following effects and results.

[0080] The belt tension adjustment tool 70 has a ruler part 72 and a guide part 74, so the deflection of the belt 26 can be accurately and easily measured in the belt tension adjustment process.

[0081] 2-4. Variations

[0082] The tension adjustment tool 70 of embodiment 2 can also be modified in the following manner.

[0083] 2-4-1. Guiding component 74

[0084] The insertion portion 742 of the guide component 74 does not necessarily need to have a structure that can maintain its own weight. Figure 10 This is a diagram illustrating a variation of the tension adjustment tool in Embodiment 2. Figure 10 The tension adjustment tool 70 of the modified example shown includes a fixing screw 744 as a fixing structure for fixing the guide member 74 to the ruler portion 72. The fixing screw 744 engages with the threaded hole of the guide member 74 that extends into the insertion portion 742, thereby fixing the guide member 74 to the ruler portion 72. Furthermore, the fixing structure is not limited to the structure of the fixing screw 744, and a known structure capable of fixing the guide member 74 to the ruler portion 72 can be used.

[0085] In the modified belt tension adjustment tool 70, the guide member 74 is fixed to the belt 26 from its initial position, with the pair of protrusions 743 of the guide member 74 contacting the belt from the top. Furthermore, during the belt tension adjustment process, the deflection amount is read from the scale of the ruler 72 as the distance from the initial position to the movement position of the belt 26 when the tension gauge G is pressed in the pressing direction until the measured load becomes the specified load. Based on the structure of this modified belt tension adjustment tool 70, the deflection amount of the belt 26 can be accurately and easily measured during the belt tension adjustment process.

[0086] 3. Other

[0087] The preferred embodiments have been described in detail above, but this disclosure is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims.

[0088] The various methods disclosed herein are summarized below as appendices.

[0089] (Note 1)

[0090] A tension adjustment tool is provided for a door device, the door device comprising: a door motor fixed to an elevator door frame in a position-adjustable manner via an adjustment fitting; a first pulley connected to the door motor; a second pulley fixed to the door frame and connected to an opening / closing mechanism for opening and closing the elevator door; and a belt wound between the first pulley and the second pulley, wherein...

[0091] The tension adjustment tool includes:

[0092] The main body is disposed between the first pulley and the second pulley;

[0093] The first arm extends from the main body toward the groove of the first pulley;

[0094] The second arm extends from the main body toward the groove of the second pulley; and

[0095] An adjustment mechanism that adjusts the distance between the end portions of the first arm and the second arm.

[0096] (Note 2)

[0097] According to the tension adjustment tool described in Appendix 1, wherein...

[0098] The tension adjustment tool includes:

[0099] A first contact portion is disposed at the end portion of the first arm and has a surface curved along the groove of the first pulley; and

[0100] The second contact portion is provided at the end of the second arm portion and has a surface that bends along the groove of the second pulley.

[0101] (Note 3)

[0102] According to Appendix 1 or 2, the tension adjustment tool, wherein,

[0103] The first arm is a screw with threaded teeth formed in the region on the base end side.

[0104] The adjustment mechanism includes a first adjustment nut that engages with the first arm.

[0105] The main body has a first insertion hole, which allows the first arm, on which the first adjusting nut is screwed, to be inserted from the base end side to a position where it contacts the first adjusting nut.

[0106] (Note 4)

[0107] According to any one of Appendices 1 to 3, the tension adjustment tool, wherein...

[0108] The second arm is a screw with threaded teeth formed in the region on the base end side.

[0109] The adjustment mechanism includes a second adjustment nut that engages with the second arm.

[0110] The main body has a second insertion hole, which allows the second arm, on which the second adjusting nut is screwed, to be inserted from the base end side to a position where it contacts the second adjusting nut.

[0111] (Note 5)

[0112] According to any one of Appendices 1 to 4, the tension adjustment tool, wherein...

[0113] The belt tension adjustment tool also has a ruler portion, which has a scale on one side, one end of which is rotatably fixed to the main body, and the other end of which extends across the belt.

[0114] (Note 6)

[0115] According to the tension adjustment tool described in Appendix 5, wherein...

[0116] The belt tension adjustment tool also includes a guide member that is slidably inserted from the other end of the ruler portion and configured to contact the belt when sliding along the ruler portion.

[0117] (Note 7)

[0118] According to Appendix 6, the tension adjustment tool, wherein...

[0119] The guide member has a holding structure for overcoming its own weight and maintaining its position relative to the ruler portion.

[0120] (Note 8)

[0121] According to Appendix 6, the tension adjustment tool, wherein...

[0122] The guide component has a fixing structure that fixes its position relative to the ruler portion.

Claims

1. A tension adjustment tool for a door device, the door device comprising: a door motor fixed to an elevator door frame in a position-adjustable manner via an adjustment fitting; a first pulley connected to the door motor; a second pulley fixed to the door frame and connected to an opening / closing mechanism for opening and closing the elevator door; and a belt wound between the first pulley and the second pulley, wherein... The tension adjustment tool includes: The main body is disposed between the first pulley and the second pulley; The first arm extends from the main body toward the groove of the first pulley; The second arm extends from the main body toward the groove of the second pulley; as well as An adjustment mechanism that adjusts the distance between the end portions of the first arm and the second arm.

2. The tension adjustment tool according to claim 1, wherein, The tension adjustment tool includes: A first contact portion is disposed at the end portion of the first arm and has a surface curved along the groove of the first pulley; and The second contact portion is provided at the end of the second arm portion and has a surface that bends along the groove of the second pulley.

3. The tension adjustment tool according to claim 1 or 2, wherein, The first arm is a screw with threaded teeth formed in the region on the base end side. The adjustment mechanism includes a first adjustment nut that engages with the first arm. The main body has a first insertion hole, which allows the first arm, on which the first adjusting nut is screwed, to be inserted from the base end side to a position where it contacts the first adjusting nut.

4. The tension adjustment tool according to claim 1 or 2, wherein, The second arm is a screw with threaded teeth formed in the region on the base end side. The adjustment mechanism includes a second adjustment nut that engages with the second arm. The main body has a second insertion hole, which allows the second arm, on which the second adjusting nut is screwed, to be inserted from the base end side to a position where it contacts the second adjusting nut.

5. The tension adjustment tool according to claim 1 or 2, wherein, The belt tension adjustment tool also includes a ruler portion, which has a scale on one side, one end of which is rotatably fixed to the main body, and the other end of which extends across the belt.

6. The tension adjustment tool according to claim 5, wherein, The belt tension adjustment tool also includes a guide member that is slidably inserted from the other end of the ruler portion and configured to contact the belt when sliding along the ruler portion.

7. The tension adjustment tool according to claim 6, wherein, The guide component has a holding structure for overcoming its own weight and maintaining its position relative to the ruler portion.

8. The tension adjustment tool according to claim 6, wherein, The guide component has a fixing structure that fixes its position relative to the ruler portion.

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