Belt tension adjustment tool

Abstract

This invention provides a belt tension adjustment tool that allows for easy and accurate adjustment of the belt tension and pulley alignment of a belt used in an elevator door system. [Solution] The elevator door device includes a door motor fixed to the door frame so as to be adjustable 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 and closing mechanism for opening and closing the elevator door, and a belt wrapped between the first pulley and the second pulley. The belt tension adjustment tool includes a main body positioned between the first pulley and the second pulley, a first arm extending from the main body toward the groove of the first pulley, a second arm extending from the main body toward the groove of the second pulley, and an adjustment mechanism for adjusting the distance between the tip of the first arm and the tip of the second arm.

Description

Technical Field

[0001] The present disclosure relates to a technology of a belt tension adjustment tool used when adjusting the belt tension of an elevator door drive mechanism.

Background Art

[0002] Patent Document 1 discloses a technology for adjusting the belt tension of an elevator door drive mechanism. In this technology, with the bolt loosened to make the adjustment bracket to which the pulley is fixed movable, a box is closely fitted to the bolt. Then, the pressing portion of the bracket pressing fitting is abutted against the adjustment bracket, and the adjustment nut is turned in the tightening direction to move the adjustment bracket to adjust the tension of the main belt.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the elevator door drive mechanism of the technology of Patent Document 1 above, the bolt for fixing the adjustment bracket to which the pulley is fixed is located directly above the main belt. Therefore, even if the adjustment bracket is moved in the tension direction of the main belt with the bolt as a fulcrum, the influence on the alignment of the pulley is small.

[0005] Here, we consider adjusting the belt tension of the belt wrapped between the door motor pulley and the drive mechanism pulley. Generally, the bolts that secure the adjustment fitting to which the door motor is fixed are not positioned directly above the belt due to constraints on the door motor's arrangement structure. Therefore, if we consider adjusting the position of the adjustment fitting to which the door motor is fixed using the technology of Patent Document 1, a yaw force with the bolt as the pivot point will act on the door motor due to the belt tension, making it difficult to adjust the belt tension while adjusting the pulley alignment.

[0006] This disclosure was made to solve the problems described above, and aims to provide a belt tension adjustment tool technology that can easily and accurately adjust the belt tension of a belt and the alignment of a pulley used in an elevator door system. [Means for solving the problem]

[0007] The belt tension adjustment tool of the present disclosure is a belt tension adjustment tool for a door device comprising: a door motor fixed to the door frame of an elevator via an adjustment fitting so as to be adjustable in position; a first pulley connected to the door motor; a second pulley fixed to the door frame and connected to an opening and closing mechanism for opening and closing the elevator door; and a belt wrapped between the first pulley and the second pulley, the tool comprising: 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 for adjusting the distance between the tip of the first arm and the tip of the second arm. [Effects of the Invention]

[0008] According to the technology of this disclosure, by adjusting the adjustment mechanism, the first arm and the second arm can be brought into contact with the first pulley and the second pulley, respectively, and thus braced. With this configuration, a force that opposes the belt tension can be applied to the first pulley and the second pulley, which are positioned on the circumferential track surface of the belt, making it possible to easily and accurately adjust the belt tension and pulley alignment. [Brief explanation of the drawing]

[0009] [Figure 1] This is a front view of the elevator door device in Embodiment 1. [Figure 2] This is a front view illustrating the configuration of the door drive mechanism. [Figure 3] Figure 2 is a plan view of the drive mechanism as seen from direction A. [Figure 4] This is a front view illustrating a belt tension adjustment tool. [Figure 5] This diagram illustrates the installation process of the belt tension adjustment tool during belt tension adjustment work. [Figure 6] This diagram illustrates the belt tension adjustment process in belt tension adjustment work using a belt tension adjustment tool. [Figure 7] This diagram illustrates the alignment adjustment process in belt tension adjustment work using a belt tension adjustment tool. [Figure 8] This is a diagram illustrating the configuration of a belt tension adjustment tool according to Embodiment 2. [Figure 9] This diagram illustrates the installation process of the belt tension adjustment tool during belt tension adjustment work. [Figure 10] This figure illustrates a modified example of the belt tension adjustment tool according to Embodiment 2. [Modes for carrying out the invention]

[0010] Several embodiments will be described below with reference to the drawings. Elements common to each figure are denoted by the same reference numerals, and redundant explanations will be omitted.

[0011] Embodiment 1. 1-1. Configuration of the elevator door device in Embodiment 1 Figure 1 is a front view of the elevator door device in Embodiment 1. The elevator shaft is formed to penetrate the floors of each level of the building. A landing is formed near the shaft on each floor. A passenger car is installed inside the shaft. A landing entrance is formed between each landing and the shaft. A landing door is provided at the landing entrance. A car entrance is formed on the landing side of the passenger car. A door device 1 is provided at the car entrance. The door device 1 includes a door 2, an opening and closing mechanism 3 for opening and closing the door 2, and a drive mechanism 4 for driving the opening and closing mechanism 3.

[0012] Door 2 is provided to open and close the entrance to the elevator car. Typically, Door 2 is provided in a pair that opens to the center. In another example, Door 2 may be provided that opens to one side.

[0013] A door frame 5 is fixed to the upper part of the cage entrance. Various components of the opening and closing mechanism 3 are installed on the door frame. The opening and closing mechanism 3 mainly consists of a suspension member 6, a hanger roller 7, a rail 8, a drive pulley 9, a driven pulley 10, a belt 11, and a connecting member 12. The suspension member 6 is fixed to the upper part of the door 2. The hanger roller 7 is installed on the upper part of the suspension member 6. The rail 8 is installed on the door frame 5 above the door 2. The drive pulley 9 is installed on one longitudinal end of the door frame 5. The driven pulley 10 is installed on the other longitudinal end of the door frame 5. The belt 11 is installed so as to circle the drive pulley 9 and the driven pulley 10. One end of the connecting member 12 is fixed to the upper part of the belt 11. The other end of the connecting member 12 is fixed to one side of the suspension member 6. The other end of the connecting member 12 is fixed to the lower part of the belt 11. The other end of the connecting member 12 is fixed to the other side of the suspension member 6. When the belt 11 is moved back and forth by the drive mechanism 4, the door 2 is guided by the hanger roller 7 that runs on the rail 8 and moves back and forth in the opposite direction, opening and closing the doorway.

[0014] Figure 2 is a front view illustrating the configuration of the door device's drive mechanism. Figure 3 is a plan view of the drive mechanism in Figure 2, viewed from direction A. The drive mechanism 4 comprises a door motor 20, a first pulley 22, a second pulley 24, and a belt 26. The first pulley 22 is connected to the rotating shaft of the door motor 20. The second pulley 24 is connected to the rotating shaft of the drive pulley 9. The belt 26 is a V-belt wrapped around the first pulley 22 and the second pulley 24.

[0015] The door motor 20 is fixed to the door frame 5 in an adjustable position via an adjustment fitting 30. Specifically, the door motor 20 is fixed to the adjustment fitting 30. The adjustment fitting 30 is fixed to the door frame 5 with bolts 32 using an elongated hole 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 hole 34 so that the alignment of the first pulley 22 and the tension of the belt 26 fall within a specified range.

[0016]

[0016] In such an elevator, when the passenger car is arranged adjacent to the landing, a part of the door 2 of the passenger car engages with a part of the landing door. In this state, the door motor 20 is driven. By this drive, power is transmitted in the order of the first pulley 22, the belt 26, and the second pulley 24, and the drive pulley 9 rotates. By this rotation, the belt 11 moves, and the door 2 opens and closes accordingly.

[0017] 1-2. Configuration of the Belt Tension Adjusting Tool in Embodiment 1 In the maintenance work of the elevator by the operator, it may be necessary to measure and adjust the tension of the belt 26 and to measure and adjust the alignment of the first pulley 22. In the following description, this series of operations is referred to as "belt tension adjustment work". In the belt tension adjustment work, it is necessary to loosen the bolt 32 to tighten the tension of the belt 26 and to adjust both the tension of the belt 26 and the alignment of the first pulley 22 within a specified range. Since the tension of the belt 26 and the alignment of the first pulley 22 change when one value is adjusted, the operator may have to repeat the operation many times, and there is a problem that the burden on the operator is large.

[0018] The belt tension adjusting tool of the present embodiment is an adjusting tool used when performing belt tension adjustment work. FIG. 4 is a front view for explaining the belt tension adjusting tool. The belt tension adjusting tool 40 includes a main body portion 42, a first adjusting nut 46, a second adjusting nut 48, a first arm portion 50, a first contact portion 52, a second arm portion 60, and a second contact portion 62.

[0019] The main body 42 is a hollow cylindrical structure with a through-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 into the insertion hole 44 from the other end. The insertion hole 44 does not necessarily have to be a through-hole. For example, the first insertion hole at one end into which the first arm 50 is inserted and the second insertion hole at the other end into which the second arm 60 is inserted may be configured as separate holes that do not go through each other.

[0020] The first arm 50 and the second arm 60 are threaded rods with screw threads formed at least in the region toward the base end. The first arm 50 and the second arm 60 may be configured as fully threaded rods.

[0021] The first contact portion 52 is fixed to the tip of the first arm portion 50. The first contact portion 52 is the part that contacts the groove of the first pulley 22 and has a curved shape that follows the groove of the first pulley 22.

[0022] The second contact portion 62 is fixed to the tip of the second arm portion 60. The second contact portion 62 is the part that contacts the groove of the second pulley 24 and has a curved shape that follows the groove of the second pulley 24.

[0023] The first adjustment nut 46 is a nut that is screwed onto the base end of the first arm portion 50. The first arm portion 50 is inserted into the insertion hole 44 of the main body portion 42 from one end with the first adjustment nut 46 screwed onto it. By adjusting the screwing position of the first adjustment nut 46 relative to the first arm portion 50, the amount of protrusion of the first arm portion 50 from the main body portion 42 can be adjusted. In other words, the first adjustment nut 46 functions as an adjustment mechanism to adjust the distance between the tip of the first arm portion 50 and the tip of the second arm portion 60.

[0024] The second adjustment nut 48 is a nut that is screwed onto the base end of the second arm portion 60. The second arm portion 60 is inserted into the insertion hole 44 of the main body portion 42 from the other end with the second adjustment nut 48 screwed onto it. By adjusting the screwing position of the second adjustment nut 48 relative to the second arm portion 60, the amount of protrusion of the second arm portion 60 from the main body portion 42 can be adjusted. In other words, the second adjustment nut 48 functions as an adjustment mechanism to adjust the distance between the tip of the first arm portion 50 and the tip of the second arm portion 60.

[0025] 1-3. Procedure for adjusting belt tension using a belt tension adjustment tool Next, the procedure for adjusting the belt tension using the belt tension adjustment tool 40 will be described. In the following description, the direction in which the belt 26 wrapped between the first pulley 22 and the second pulley 24 is taut will be referred to as the "tension direction," and the direction perpendicular to the tension direction and the horizontal direction will be referred to as the "pressing direction." In the belt tension adjustment work, the position of the adjustment fitting 30 to which the door motor 20 is fixed is adjusted so that the amount of deflection when the upper center of the belt 26 wrapped between the first pulley 22 and the second pulley 24 is pressed with a specified load in the pressing direction falls within a specified range. In addition, the alignment of the first pulley 22 with respect to the second pulley 24 is adjusted by adjusting the position of the adjustment fitting 30. The procedure for adjusting the belt tension using the belt tension adjustment tool 40 will be described in detail below.

[0026] 1-3-1. Installation process for the belt tension adjustment tool Figure 5 is a diagram illustrating the installation process of the belt tension adjustment tool during belt tension adjustment work. In the installation process, the worker adjusts the first adjustment nut 46 and the second adjustment 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.

[0027] 1-3-2. Belt Tension Adjustment Process Figure 6 is a diagram illustrating the belt tension adjustment process in belt tension adjustment work using a belt tension adjustment tool. In the belt tension adjustment process, the worker loosens two bolts 32 to make the position of the door motor 20 adjustable. At this time, the tension applied to the belt 26 is supported by the attached belt tension adjustment tool 40, so that the door motor 20 does not shift significantly toward the second pulley 24.

[0028] Next, the worker adjusts the belt tension by adjusting the first adjustment nut 46 or the second adjustment nut 48 of the belt tension adjustment tool 40. Typically, adjusting the first adjustment nut 46 or the second adjustment nut 48 to increase the distance between the first contact portion 52 and the second contact portion 62 increases the belt tension of the belt 26, and decreasing the distance between the first contact portion 52 and the second contact portion 62 decreases the belt tension of the belt 26.

[0029] The worker presses the tension gauge G in the pressing direction against the measuring section near the center of the upper part of the belt 26, which is wrapped between the first pulley 22 and the second pulley 24. The worker measures the amount of deflection of the belt 26 at the measuring section when the measured load of the tension gauge G reaches the specified load, using a steel ruler or the like. If the measured amount of deflection does not fall within the specified range, the worker readjusts the first adjustment nut 46 or the second adjustment nut 48.

[0030] 1-3-3. Alignment Adjustment Process Figure 7 illustrates the alignment adjustment process in belt tension adjustment work using a belt tension adjustment tool. In the alignment adjustment process, the worker uses a steel ruler S or the like to adjust the position of the adjustment fitting 30 so that the axial position and radial orientation of the first pulley 22 match those of the second pulley 24, and then fastens the two bolts 32. After or during the alignment adjustment process, the belt tension adjustment process is performed as needed to adjust both the belt tension and alignment simultaneously.

[0031] 1-4. Operation and Effects of Belt Tension Adjustment Tools The following actions and effects can be obtained with the belt tension adjustment tool 40 described above.

[0032] The belt tension adjustment tool 40 can apply a force that counteracts the belt tension between the first pulley 22 and the second pulley 24, so that during belt tension adjustment, the worker does not need to hold the door motor 20 against the tension of the belt 26. This improves the efficiency of the belt tension adjustment work.

[0033] The belt tension adjustment tool 40 applies a force that counteracts the belt tension between the first pulley 22 and the second pulley 24, which are positioned on the circumferential track surface of the belt 26. Therefore, compared to the case where the door motor 20 is held, misalignment of the first pulley 22 due to the tension of the belt 26 is less likely to occur.

[0034] The first contact portion 52 and the second contact portion 62 have a curved structure that follows the grooves of the first pulley 22 and the second pulley 24, respectively. This structure prevents the installed belt tension adjustment tool 40 from coming off.

[0035] 1-5. Variations The belt tension adjustment tool 40 of Embodiment 1 may adopt the following modified forms.

[0036] 1-5-1. First contact portion 52 and second contact portion 62 There are no limitations on the shape of the first contact portion 52 and the second contact portion 62. This modified example can also be applied to the belt tension adjustment tool of Embodiment 2, which will be described later.

[0037] 1-5-2. First adjustment nut 46 and second adjustment nut 48 The first adjustment nut 46 and the second adjustment nut 48 may be integrally formed with the main body 42. In this case, the thread direction of the first arm 50 and the first adjustment nut 46 should be reversed compared to the second arm 60 and the second adjustment nut 48. With such a configuration, the distance between the first contact portion 52 and the second contact portion 62 can be adjusted by rotating the main body 42, which integrates the first adjustment nut 46 and the second adjustment nut 48.

[0038] The belt tension adjustment tool 40 may be configured to include only one of the first adjustment nut 46 and the second adjustment nut 48. That is, for example, if the belt tension adjustment tool 40 is equipped with a position adjustment mechanism using the first adjustment nut 46, the second arm portion 60 does not need to be configured to be position-adjustable relative to the main body portion 42. This modification can also be applied to the belt tension adjustment tool of Embodiment 2, which will be described later.

[0039] 2. Embodiment 2 2-1. Features of the belt tension adjustment tool in Embodiment 2 Figure 8 is a diagram illustrating the configuration of a belt tension adjustment tool according to Embodiment 2. In Figure 8, (A) is a front view of the belt tension adjustment tool, and (B) is a diagram illustrating the configuration of the guide member as seen from direction B in the figure. In Figure 8, components common to the belt tension adjustment tool shown in Figure 4 are denoted by the same reference numerals and their explanation is omitted.

[0040] The belt tension adjustment tool 70 of Embodiment 2 further comprises a straight ruler section 72 and a guide member 74, in addition to the configuration of the belt tension adjustment tool 40 shown in Figure 4. The straight ruler section 72 has a scale on one surface and one end is rotatably fixed to the main body section 42. When the belt tension adjustment tool 70 is installed on the drive mechanism 4, the other end of the straight ruler section 72 has a length that straddles the belt 26 and extends to the area above the belt 26.

[0041] The guide member 74 includes a rectangular parallelepiped base 741 with an insertion portion 742 into which the straight ruler portion 72 is inserted, and a pair of projections 743 that protrude from both ends of the base 741 toward the belt 26 when the belt tension adjustment tool 70 is installed on the drive mechanism 4. The straight 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 holding structure configured to fit the straight ruler portion 72 in a manner that can hold the weight of the guide member 74.

[0042] 2-2. Belt tension adjustment procedure using the belt tension adjustment tool of Embodiment 2 Next, the procedure for performing belt tension adjustment work using the belt tension adjustment tool 70 of Embodiment 2 will be described.

[0043] 2-2-1. Installation process for the belt tension adjustment tool Figure 9 is a diagram illustrating the installation process of the belt tension adjustment tool during belt tension adjustment work. In the installation process, the worker adjusts the first adjustment nut 46 and the second adjustment nut 48 so that the first contact portion 52 of the belt tension adjustment tool 40 contacts the groove portion of the first pulley 22 and the second contact portion 62 contacts the groove portion of the second pulley 24. At this time, the worker aligns the straight section 72 so that it is perpendicular to the belt 26. Then, the first adjustment nut 46 and the second adjustment nut 48 are adjusted so that the point where the straight section 72 and the belt 26 intersect is near the center of the straight portion of the belt 26. The guide member 74 is initially positioned so that the projection 743 contacts the belt from below the belt 26.

[0044] 2-2-2. Belt Tension Adjustment Process Figure 9 is a diagram illustrating the belt tension adjustment process in a belt tension adjustment operation using the belt tension adjustment tool of Embodiment 2. In the belt tension adjustment process, the worker loosens the two bolts 32 to make the position of the door motor 20 adjustable. At this time, the tension applied to the belt 26 is supported by the attached belt tension adjustment tool 70, so that the door motor 20 does not shift significantly toward the second pulley 24.

[0045] Next, the worker adjusts the belt tension by adjusting the first adjustment nut 46 or the second adjustment nut 48 of the belt tension adjustment tool 70. Next, the worker reads the initial position of the guide member 74 from the scale on the ruler section 72. Next, the worker presses the tension gauge G in the pressing direction against the measuring portion of the belt 26 located between the pair of protrusions 743 until the measured load reaches the specified load. As a result, the guide member 74 is pressed by the deflected belt 26 and moves in the pressing direction. The worker reads the moved position of the guide member 74 from the scale on the ruler section 72 and measures the amount of change in position from the initial position as the amount of deflection of the belt 26. If the measured amount of deflection does not fall within the specified range, the first adjustment nut 46 or the second adjustment 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.

[0046] 2-3. Operation and Effects of the Belt Tension Adjustment Tool of Embodiment 2 The following actions and effects can be obtained with the belt tension adjustment tool 70 described above.

[0047] Since the belt tension adjustment tool 70 is equipped with a straight ruler section 72 and a guide member 74, it is possible to accurately and easily measure the amount of deflection of the belt 26 during the belt tension adjustment process.

[0048] 2-4. Variations The belt tension adjustment tool 70 of Embodiment 2 may employ the following modified forms.

[0049] 2-4-1. Guide member 74 The insertion portion 742 of the guide member 74 does not necessarily need to have a structure capable of holding its own weight. Figure 10 is a diagram illustrating a modified example of the belt tension adjustment tool of Embodiment 2. The modified belt tension adjustment tool 70 shown in Figure 10 is equipped with a fixing screw 744 as a fixing structure for fixing the guide member 74 to the straight section 72. The fixing screw 744 is screwed into a screw hole in the guide member 74 that penetrates to the insertion portion 742, thereby fixing the guide member 74 to the straight section 72. Note that the fixing structure is not limited to the structure of the fixing screw 744, and any known structure that can fix the guide member 74 to the straight section 72 can be adopted.

[0050] In the modified belt tension adjustment tool 70, the guide member 74 is fixed by a fixing screw 744 in the initial position where the pair of projections 743 of the guide member 74 are in contact with the belt 26 from above. Then, in the belt tension adjustment process, the distance from the initial position when the tension gauge G is pressed in the pressing direction until the measured load reaches the specified load to the position where the belt 26 has moved is read from the scale of the straight ruler 72 as the amount of deflection. With this configuration of the modified belt tension adjustment tool 70, it is possible to accurately and easily measure the amount of deflection of the belt 26 in the belt tension adjustment process.

[0051] 3. Others Although preferred embodiments have been described in detail above, 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.

[0052] The various aspects of this disclosure are summarized below as an appendix.

[0053] (Note 1) A belt tension adjustment tool for a door device, comprising: a door motor fixed to the elevator door frame so as to be positionable 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 and closing mechanism for opening and closing the elevator door; and a belt wrapped between the first pulley and the second pulley, A main body portion disposed between the first pulley and the 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, An adjustment mechanism for adjusting the distance between the tip of the first arm and the tip of the second arm, A belt tension adjustment tool equipped with the following features. (Note 2) A first contact portion is provided at the tip of the first arm and has a surface curved along the groove of the first pulley, A second contact portion is provided at the tip of the second arm and has a curved surface along the groove of the second pulley, A belt tension adjustment tool as described in Appendix 1, which includes the following features. (Note 3) The first arm portion is a threaded rod with a screw thread formed in the region at its base end. The adjustment mechanism is, The first arm portion is equipped with a first adjustment nut that is screwed into it, The belt tension adjustment tool according to Appendix 1 or Appendix 2, wherein the main body portion is provided with a first insertion hole into which the first arm portion, into which the first adjustment nut is screwed, can be inserted from the base end side to a position in contact with the first adjustment nut. (Note 4) The second arm portion is a threaded rod with a screw thread formed in the region at its base end. The adjustment mechanism is, The second arm portion is equipped with a second adjustment nut that is screwed into it, The belt tension adjustment tool according to any one of the appendices 1 to 3, wherein the main body portion is provided with a second insertion hole into which the second arm portion, into which the second adjustment nut is screwed, can be inserted from the base end to a position where it contacts the second adjustment nut. (Note 5) A belt tension adjustment tool according to any one of the appendices 1 to 4, having a scale on one surface, one end of which is rotatably fixed to the main body, and the other end of which is a straight ruler that extends across the belt. (Note 6) The belt tension adjustment tool according to Appendix 5, further comprising a guide member that is slidably inserted from the other end of the straight section and configured to contact the belt when slid along the straight section. (Note 7) The belt tension adjustment tool according to Appendix 6, wherein the guide member is provided with a retaining structure for maintaining its position relative to the straight section against its own weight. (Note 8) The belt tension adjustment tool according to Appendix 6, wherein the guide member is provided with a fixing structure for fixing its position relative to the straight section. [Explanation of Symbols]

[0054] 1 Door device, 2 Door, 3 Opening / closing mechanism, 4 Drive mechanism, 5 Door frame, 6 Suspension member, 7 Hanger roller, 8 Rail, 9 Drive pulley, 10 Driven pulley, 11 Belt, 12 Connecting member, 20 Door motor, 22 First pulley, 24 Second pulley, 26 Belt, 30 Adjustment fitting, 32 Bolt, 34 Slotted hole, 40 Belt tension adjustment tool, 42 Main body, 44 Insertion hole, 46 First adjustment nut, 48 Second adjustment nut, 50 First arm, 52 First contact part, 60 Second arm, 62 Second contact part, 70 Belt tension adjustment tool, 72 Straight part, 74 Guide member, 741 Base, 742 Insertion part, 743 Projection part 744 Fixing screws

Claims

1. A belt tension adjustment tool for a door device, comprising: a door motor fixed to the elevator door frame via an adjustment fitting so as to be positionable; a first pulley connected to the door motor; a second pulley fixed to the door frame and connected to an opening and closing mechanism for opening and closing the elevator door; and a belt wrapped between the first pulley and the second pulley, A main body portion disposed between the first pulley and the 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, An adjustment mechanism for adjusting the distance between the tip of the first arm and the tip of the second arm, A belt tension adjustment tool equipped with the following features.

2. A first contact portion is provided at the tip of the first arm and has a surface curved along the groove of the first pulley, A second contact portion is provided at the tip of the second arm and has a curved surface along the groove of the second pulley, The belt tension adjustment tool according to claim 1, comprising:

3. The first arm portion is a threaded rod with a screw thread formed in the region at its base end. The adjustment mechanism is, The first arm portion is equipped with a first adjustment nut that is screwed into it, The belt tension adjustment tool according to claim 1 or 2, wherein the main body portion is provided with a first insertion hole into which the first arm portion, into which the first adjustment nut is screwed, can be inserted from the base end side to a position in contact with the first adjustment nut.

4. The second arm portion is a threaded rod with a screw thread formed in the region at its base end. The adjustment mechanism is, The second arm portion is equipped with a second adjustment nut that is screwed into it, The belt tension adjustment tool according to claim 1 or 2, wherein the main body portion is provided with a second insertion hole into which the second arm portion, into which the second adjustment nut is screwed, can be inserted from the base end to a position where it contacts the second adjustment nut.

5. A belt tension adjustment tool according to claim 1 or claim 2, further comprising a straight ruler having a scale on one surface, one end of which is rotatably fixed to the main body, and the other end of which extends across the belt.

6. The belt tension adjustment tool according to claim 5, further comprising a guide member that is slidably inserted from the other end of the straight section and configured to contact the belt when slid along the straight section.

7. The belt tension adjustment tool according to claim 6, wherein the guide member is provided with a holding structure for maintaining its position relative to the straight section against its own weight.

8. The belt tension adjustment tool according to claim 6, wherein the guide member is provided with a fixing structure for fixing its position relative to the straight section.

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