Tension adjustment mechanism and fitting for use in opening

Abstract

To provide a tension adjustment mechanism and a fitting for use in an opening, both having a simple structure.SOLUTION: A tension adjustment mechanism 1 includes a pulley 4 that is rotatable about a first direction Z as its axial direction, a support member 3 that supports the pulley 4, a fixing member 2 that fixes the support member 3 to allow movement thereof in a second direction X perpendicular to the first direction Z, and an adjustment screw 5. The fixing member 2 has a screw insertion portion 22 in which an adjustment screw hole 221 is formed through which the adjustment screw 5 can be inserted. The support member 3 has a pressing portion 32 in which a pressing surface 321 is formed that extends along a direction intersecting the second direction X and is pressed by the adjustment screw 5 inserted into the adjustment screw hole 221.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a tension adjustment mechanism and an opening fitting.

Background Art

[0002] Conventionally, in order to adjust the tension of members such as belts and wires, a mechanism using a member with a coil spring wound around a round bar (see Patent Document 1 below) and the like are known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is a problem that the number of parts increases, such as built-in coil springs and parts for swinging a target part provided in the middle due to the positional relationship with other parts.

[0005] The present disclosure has been made in view of the above circumstances, and provides a tension adjustment mechanism and an opening fitting with a simple configuration.

Means for Solving the Problems

[0006] A tension adjustment mechanism according to an aspect of the present disclosure includes a pulley rotatable about a first direction as an axial direction, a support member that supports the pulley, a fixing member that fixes the support member so as to be movable in a second direction orthogonal to the first direction, and an adjustment screw. The fixing member has a screw insertion portion in which an adjustment screw hole into which the adjustment screw can be inserted is formed, and the support member has a pressing portion in which a pressing surface that extends along a direction intersecting the second direction and is pressed by the adjustment screw inserted into the adjustment screw hole is formed.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0008] (First Embodiment) Hereinafter, a first embodiment of the tension adjustment mechanism and the opening fixture of the present disclosure will be described with reference to FIGS. 1 to 6. The following embodiments show one aspect of the present disclosure, do not limit this disclosure, and can be arbitrarily changed within the scope of the technical idea of this disclosure. Further, in the following drawings, in order to make each configuration easy to understand, the actual structure and the scale etc. in each structure are made different.

[0009] In the following embodiments, an example in which the tension adjustment mechanism of the present disclosure is attached to a door fitting will be described with reference to an automatic door. As shown in FIG. 1, the automatic door 100 includes a frame body 101, a shoji 110, a tension adjustment mechanism 1, and a belt 6. The automatic door 100 corresponds to the door fitting in the claims.

[0010] In the description of the automatic door 100, when the shoji 110 is viewed from the front, the left side is referred to as the left side, the right side is referred to as the right side, and the direction connecting the left side and the right side is referred to as the left - right direction.

[0011] The frame body 101 includes an upper frame 102, a lower frame 103, and a pair of left - and - right vertical frames 104, 104. The shoji 110 is disposed inside the frame body 101 so as to be movable in the left - right direction.

[0012] The tension adjustment mechanism 1 is provided inside the upper frame 102. For example, an interlocking member (not shown) is connected to the belt 6 provided in the tension adjustment mechanism 1. The interlocking member is connected to the shoji 110. In accordance with the rotation of the belt 6, the shoji 110 is movable in the left - right direction.

[0013] As shown in FIG. 2, the tension adjustment mechanism 1 includes a fixing member 2, a support member 3, a pulley 4, and an adjustment screw 5.

[0014] In the drawings, the X - axis, Y - axis, and Z - axis are shown as appropriate. The direction along the Z - axis is referred to as the first direction Z. The direction along the X - axis is referred to as the second direction X. The direction along the Y - axis is referred to as the third direction Y. One side of the first direction Z is referred to as one - side Z1, and the other side is referred to as the other - side Z2. One side of the second direction X is referred to as one - side X1, and the other side is referred to as the other - side X2. One side of the third direction Y is referred to as one - side Y1, and the other side is referred to as the other - side Y2.

[0015] As shown in FIG. 3, the fixing member 2 has a screw - fixing portion 21, a screw - insertion portion 22, extending portions 23, 24, 25, and object - fixing portions 26, 27.

[0016] The screw fixing portion 21 is formed in a plate shape. The plate surface of the screw fixing portion 21 faces the first direction Z. When viewed from the first direction Z, the screw fixing portion 21 is formed in a substantially rectangular shape with the second direction X as the long side direction and the third direction Y as the short side direction. The shape of the screw fixing portion 21 is not limited to a substantially rectangular shape and may be circular, and can be set as appropriate.

[0017] A pulley support hole 211 is formed in the screw fixing portion 21. The pulley support hole 211 is a through hole that penetrates the screw fixing portion 21 in the first direction Z. When viewed from the first direction Z, the pulley support hole 211 is formed substantially at the center of the screw fixing portion 21. The position of the pulley support hole 211 can be set as appropriate.

[0018] A fixing screw hole 212 is formed in the screw fixing portion 21. The fixing screw hole 212 is a screw hole that penetrates the screw fixing portion 21 in the first direction Z. The fixing screw hole 212 is formed near the four corners of the substantially rectangular screw fixing portion 21 when viewed from the first direction Z. The number and position of the fixing screw holes 212 can be set as appropriate.

[0019] The screw insertion portion 22 extends from the end of the screw fixing portion 21 on one side X1 in the second direction X to one side Z1 in the first direction Z. The screw insertion portion 22 is formed in a plate shape. The plate surface of the screw insertion portion 22 faces the second direction X. When viewed from the second direction X, the screw insertion portion 22 is formed in a substantially rectangular shape with the first direction Z as the long side direction and the third direction Y as the short side direction. The shape of the screw insertion portion 22 is not limited to a substantially rectangular shape and may be circular, and can be set as appropriate.

[0020] An adjustment screw hole 221 is formed in the screw insertion portion 22. The adjustment screw hole 221 is a through hole that penetrates the screw insertion portion 22 in the second direction X. When viewed from the second direction X, the adjustment screw hole 221 is formed substantially at the center of the screw insertion portion 22. The position of the adjustment screw hole 221 can be set as appropriate.

[0021] The extending portion 23 extends from the end portion on the other side X2 in the X direction of the screw fixing portion 21 to the other side Z2 in the first direction Z. The extending portion 23 is provided over substantially the entire length in the third direction Y of the end portion on the other side X2 in the X direction of the screw fixing portion 21. The extending portion 23 is formed in a plate shape. The plate surface of the extending portion 23 faces the second direction X. When viewed from the second direction X, the extending portion 23 is formed in a substantially rectangular shape. The shape of the extending portion 23 can be set as appropriate.

[0022] The extending portions 24 and 25 extend from the end portion on one side X1 in the X direction of the screw fixing portion 21 to the other side Z2 in the first direction Z. The extending portions 24 and 25 are provided at a distance from each other in the third direction Y at the end portion on one side X1 in the X direction of the screw fixing portion 21. The extending portion 24 is arranged on one side Y1 in the third direction Y with respect to the extending portion 25. The extending portions 24 and 25 are formed in a plate shape. The plate surfaces of the extending portions 24 and 25 face the second direction X. When viewed from the second direction X, the extending portions 24 and 25 are formed in a substantially rectangular shape. The shape of the extending portion 23 can be set as appropriate. The extending portions 24 and 25 may be integrally configured like the extending portion 23 without being separated in the third direction Y.

[0023] The object fixing portion 26 extends from the end portion on the other side Z2 in the first direction Z of the extending portion 23 to the other side X2 in the second direction X. The object fixing portion 26 is formed in a plate shape. The plate surface of the object fixing portion 26 faces the first direction Z. When viewed from the first direction Z, the object fixing portion 26 is formed in a substantially rectangular shape. The shape of the object fixing portion 26 can be set as appropriate. The object fixing portion 26 may extend from the end portion on the other side Z2 in the first direction Z of the extending portion 23 to one side X1 in the second direction X.

[0024] An attachment hole 261 is formed in the object fixing portion 26. The attachment hole 261 is a through hole that penetrates the object fixing portion 26 in the first direction Z.

[0025] The object fixing part 27 extends from the end on the other side Z2 in the first direction Z of the extending parts 24 and 25 to the other side X2 in the second direction X. The object fixing part 27 connects the ends on the other side Z2 in the first direction Z of the extending parts 24 and 25. The object fixing part 27 is formed in a plate shape. The plate surface of the object fixing part 27 faces the first direction Z. When viewed from the first direction Z, the object fixing part 27 is formed in a substantially rectangular shape. The shape of the object fixing part 27 can be set as appropriate. The object fixing part 27 may extend from the end on the other side Z2 in the first direction Z of the extending parts 24 and 25 to one side X1 in the second direction X.

[0026] An attachment hole 271 is formed in the object fixing part 27. The attachment hole 271 is a through hole that penetrates the object fixing part 27 in the first direction Z.

[0027] As shown in FIG. 2, screws 28 are respectively inserted into the attachment hole 261 of the object fixing part 26 and the attachment hole 271 of the object fixing part 27. The screws 28 are screwed to the object to be attached. The screws 28 are fixed to the fixing surface A of the object shown in FIG. 5. In the automatic door 100, the fixing surface A to which the screws 28 are fixed corresponds to the surface 102a seen from the front in the upper frame 102 shown in FIG. 1.

[0028] As shown in FIG. 4, the support member 3 has a pulley support part 31 and a pressing part 32.

[0029] The pulley support part 31 is formed in a plate shape. The plate surface of the pulley support part 31 faces the first direction Z. When viewed from the first direction Z, the pulley support part 31 is formed in a substantially rectangular shape with the second direction X as the long side direction and the third direction Y as the short side direction. The shape of the pulley support part 31 is not limited to a substantially rectangular shape and may be circular, and can be set as appropriate. As shown in FIG. 2, the pulley support part 31 is arranged on one side Z1 in the first direction Z of the screw fixing part 21 of the fixing member 2. The pulley support part 31 is supported by the screw fixing part 21.

[0030] As shown in Fig. 4, a pulley support hole 311 is formed in the pulley support portion 31. The pulley support hole 311 is a through hole that penetrates the pulley support portion 31 in the first direction Z. When viewed from the first direction Z, the pulley support hole 311 is formed substantially at the center of the pulley support portion 31. The pulley support hole 311 is formed at a position corresponding to the pulley support hole 211 of the fixing member 2 shown in Fig. 3.

[0031] As shown in Fig. 4, a long hole 312 is formed in the pulley support portion 31. The long hole 312 is a screw hole that penetrates the pulley support portion 31 in the first direction Z. The long hole 312 is a hole that is long in the second direction X. The long hole 312 is formed near the four corners of the pulley support portion 31 that is substantially rectangular when viewed from the first direction Z. The long hole 312 is formed at a position corresponding to the fixing screw hole 212 of the fixing member 2 shown in Fig. 3. As shown in Fig. 4, the two long holes 312 on one side X1 in the second direction X are defined as long holes 312A.

[0032] The pressing portion 32 extends in the first direction Z to one side Z1 from a portion on the other side X2 that is slightly more than the end portion on one side X1 in the second direction X of the pulley support portion 31. The pressing portion 32 is disposed between the long holes 312A on both sides in the third direction Y. The portion of the pulley support portion 31 where the long hole 312A is formed is a protruding portion 33 that protrudes to one side X1 in the second direction X from the pressing portion 32.

[0033] The pressing portion 32 is formed in a plate shape. The plate surface of the pressing portion 32 faces the second direction X. When viewed from the second direction X, the pressing portion 32 is formed in a substantially rectangular shape with the first direction Z as the long side direction and the third direction Y as the short side direction. The shape of the screw insertion portion 22 is not limited to a substantially rectangular shape and may be circular, and can be set as appropriate.

[0034] As shown in FIG. 2, the pressing portion 32 is disposed to face the other side X2 in the second direction X of the screw insertion portion 22. The surface of the pressing portion 32 facing the screw insertion portion 22 side is the pressing surface 321. The pressing surface 321 extends along the first direction Z and the third direction Y that are orthogonal to the second direction X. The first direction Z and the third direction Y correspond to directions that intersect the second direction in the claims.

[0035] The pulley 4 has a pulley shaft portion 41 and a pulley rotating portion 42. The pulley shaft portion 41 extends in the first direction Z. The axial direction of the pulley shaft portion 41 is the first direction Z. The end portion of the pulley shaft portion 41 on the other side Z2 in the first direction Z is inserted into the pulley support hole 311 of the support member 3 shown in FIG. 4 and the pulley support hole 211 of the fixing member 2 shown in FIG. 3, and is rotatably connected about the first direction Z via a coupling (not shown). For example, the pulley shaft portion 41 is rotatable by the driving force of a driving portion (not shown). As shown in FIG. 2, the pulley rotating portion 42 is provided on the one side Z1 side in the first direction Z of the pulley support portion 31 of the support member 3. The pulley rotating portion 42 is supported by the pulley support portion 31. The pulley rotating portion 42 is rotatable about the first direction Z together with the pulley shaft portion 41.

[0036] The annularly formed belt 6 is wound along at least a part of the outer peripheral surface of the pulley rotating portion 42. The belt 6 is wound from the other side Y2 side in the third direction Y of the pulley rotating portion 42 across the other side X2 in the second direction X and the one side Y1 in the third direction Y. Although not shown, the belt 6 is stretched between a driving pulley (a driving portion not shown) and the pulley rotating portion 42. The belt 6 is rotatable along the outer periphery of the pulley rotating portion 42.

[0037] As shown in FIG. 5, the adjustment screw 5 is inserted into the adjustment screw hole 221 of the screw insertion portion 22 of the fixing member 2. The adjustment screw 5 extends in the second direction X. The end portion 51 on the other side X2 of the adjustment screw 5 in the second direction X protrudes from the adjustment screw hole 221 to the other side X2 in the second direction X. The end portion 51 of the adjustment screw 5 abuts against the pressing surface 321 of the pressing portion 32 of the support member 3. The end portion 51 of the adjustment screw 5 presses the pressing surface 321 of the pressing portion 32 toward the other side X2 in the second direction X.

[0038] As shown in FIG. 6, a fixing screw 35 is inserted into the long hole 312 of the pulley support portion 31 of the support member 3. The fixing screw 35 is screwed into the fixing screw hole 212 of the screw fixing portion 21 of the fixing member 2. The fixing screw 35 can be arranged at any position in the second direction X within the long hole 312. By changing the position of the fixing screw 35 within the long hole 312, the fixing position of the support member 3 in the second direction X can be changed. By changing the position of the fixing screw 35 within the long hole 312, the position of the pressing portion 32 of the support member 3 in the second direction X can be changed. By changing the position of the fixing screw 35 within the long hole 312, the distance L in the second direction X between the pressing surface 321 of the pressing portion 32 and the screw insertion portion 22 of the fixing member 2 can be changed.

[0039] When adjusting to increase the tension of the belt 6, the fixing screw 35 is loosened. As shown by the two-dot chain line, the tightening amount of the adjustment screw 5 is increased to move the support member 3 to the other side X2 in the second direction X. The fixing screw 35 is arranged on the one side X1 in the second direction X within the long hole 312 rather than before adjustment. In this state, the fixing screw 35 is screwed to fix the position of the support member 3. The support member 3 moves to the other side X2 in the second direction X, the distance L between the pressing surface 321 of the pressing portion 32 and the screw insertion portion 22 becomes longer, and the tension acts greatly on the belt 6. When reducing the tension of the belt 6, the tightening amount of the adjustment screw 5 is reduced so that the distance L between the pressing surface 321 of the pressing portion 32 and the screw insertion portion 22 becomes shorter, and the support member 3 is moved to the one side X1 in the second direction X and fixed.

[0040] In the tension adjusting mechanism 1 and the automatic door 100 configured as described above, the adjusting screw 5 is inserted into the adjusting screw hole 221 of the screw insertion portion 22 of the fixing member 2. The adjusting screw 5 presses the pressing surface 321 of the pressing portion 32 provided on the support member 3 that supports the pulley 4. By the pressing surface 321 along the direction orthogonal to the second direction X being pressed by the adjusting screw 5, the support member 3 is movable in the second direction X with respect to the fixing member 2. By moving the support member 3 in the second direction X, the tension in the second direction X of the belt 6 wound around the pulley 4 having the first direction Z orthogonal to the second direction X as the axial direction can be adjusted. With a simple configuration, the tension of the belt 6 wound around the pulley 4 can be adjusted.

[0041] The fixing screw 35 is inserted into the long hole 312 that is long in the second direction X formed in the pulley support portion 31 of the support member 3 and is screwed into the fixing screw hole 212 of the fixing member 2. By adjusting the position of the fixing screw 35 in the second direction X within the long hole 312, the support member 3 can be moved in the second direction X. The support member 3 can be easily moved in the second direction X to adjust the tension.

[0042] The adjusting screw 5 extending in the second direction X presses the pressing surface 321 that is orthogonal to the second direction X. By adjusting the tightening amount of the adjusting screw 5 from the second direction X, the tension can be adjusted. Since the pressing surface 321 is orthogonal to the extending direction of the adjusting screw 5, the pressing force of the adjusting screw 5 can contribute to the tension of the belt 6 and the movement of the support member 3 in the second direction X without loss.

[0043] In the automatic door 100, by adjusting the tension of the belt 6 that contributes to the opening and closing of the shoji 110, smooth opening and closing of the shoji 110 can be achieved.

[0044] (Second Embodiment) A second embodiment of the tension adjusting mechanism and the opening fixture of the present disclosure will be mainly described with reference to FIGS. 7 and 8. In this figure, the same elements as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0045] As shown in FIGS. 7 and 8, a bent plate portion 223 is provided so as to extend from one side X1 in the second direction X of the screw fixing portion 21 of the fixing member 2 to one side Z1 in the first direction Z. The screw insertion portion 22A is provided at an end portion on one side Z1 in the first direction Z of the bent plate portion 223. The screw insertion portion 22A is formed in a plate shape. The plate surface of the screw insertion portion 22A faces the first direction Z. An adjustment screw hole 221A is formed in the screw insertion portion 22A. The adjustment screw hole 221A is a through hole that penetrates the screw insertion portion 22A in the first direction Z.

[0046] The pressing portion 32A extends from a portion on the other side X2 slightly more than the end portion on one side X1 in the second direction X of the pulley support portion 31 toward the other side X2 in the second direction X as it goes toward one side Z1 in the first direction Z. The pressing portion 32A is formed in a plate shape. The pressing portion 32A is disposed on the other side Z2 in the first direction Z of the screw insertion portion 22A. The surface of the pressing portion 32A facing the screw insertion portion 22A side is the pressing surface 321A. The pressing surface 321A is along a direction intersecting the second direction X and the first direction Z.

[0047] The adjustment screw 5A is inserted into the adjustment screw hole 221A of the screw insertion portion 22A of the fixing member 2. The adjustment screw 5A extends in the first direction Z. The end portion 51A on the other side X2 in the second direction X of the adjustment screw 5A protrudes from the adjustment screw hole 221A to the other side X2 in the second direction X. At least a part of the end portion 51A of the adjustment screw 5A presses the pressing surface 321A of the pressing portion 32A of the support member 3 to the other side Z2 in the first direction Z and the other side X2 in the second direction X. The pressing surface 321A receives a force on the other side Z2 in the first direction Z and the other side X2 in the second direction X. Due to the pressing force from the adjustment screw 5A, the support member 3 is movable to the other side X2 side in the second direction X.

[0048] In the tension adjusting mechanism 1A and the automatic door 100 configured as described above, the adjusting screw 5A is inserted into the adjusting screw hole 221A of the screw insertion portion 22A of the fixing member 2. The adjusting screw 5A presses the pressing surface 321A of the pressing portion 32A provided on the support member 3 that supports the pulley 4. By pressing the pressing surface 321A along the direction intersecting the second direction X with the adjusting screw 5A, the support member 3 is movable in the second direction X with respect to the fixing member 2. By moving the support member 3 in the second direction X, the tension in the second direction X of the belt 6 wound around the pulley 4 having the first direction Z perpendicular to the second direction X as the axial direction can be adjusted. With a simple configuration, the tension of the belt 6 wound around the pulley 4 can be adjusted.

[0049] The adjusting screw 5A extending in the first direction Z presses the pressing surface 321A along the direction intersecting the first direction Z and the second direction X. By adjusting the tightening amount of the adjusting screw 5A from the first direction Z, the tension can be adjusted.

[0050] (Third Embodiment) The third embodiment of the tension adjusting mechanism and the opening fixture of the present disclosure will be mainly described with reference to FIGS. 9 and 10. In this figure, the same elements as those of the first embodiment shown above are denoted by the same reference numerals, and the description thereof will be omitted.

[0051] As shown in FIGS. 9 and 10, the screw insertion portion 22B extends gradually toward the other side X2 in the second direction X as it extends from one side X1 in the second direction X of the screw fixing portion 21 of the fixing member 2 to one side Z1 in the first direction Z. The screw insertion portion 22B is formed in a plate shape. An adjusting screw hole 221B is formed in the screw insertion portion 22B. The adjusting screw hole 221B is a through hole that penetrates the screw insertion portion 22 in the plate thickness direction.

[0052] The adjustment screw 5B is inserted into the adjustment screw hole 221B of the screw insertion portion 22B of the fixing member 2. The adjustment screw 5B extends in a direction intersecting the second direction X and the first direction Z. The end portion 51B of the adjustment screw 5B on the other side X2 in the second direction X protrudes from the adjustment screw hole 221B to the other side X2 in the second direction X. At least a part of the end portion 51B of the adjustment screw 5B presses the pressing surface 321 of the pressing portion 32 of the support member 3 to the other side Z2 in the first direction Z and the other side X2 in the second direction X. The pressing surface 321 receives a force on the other side Z2 in the first direction Z and the other side X2 in the second direction X. Due to the pressing force from the adjustment screw 5B, the support member 3 is movable to the other side X2 side in the second direction X.

[0053] In the tension adjustment mechanism 1B and the automatic door 100 configured as described above, the adjustment screw 5B is inserted into the adjustment screw hole 221B of the screw insertion portion 22B of the fixing member 2. The adjustment screw 5B presses the pressing surface 321 of the pressing portion 32 provided on the support member 3 that supports the pulley 4. The pressing surface 321 along the direction orthogonal to the second direction X is pressed by the adjustment screw 5B, so that the support member 3 is movable in the second direction X with respect to the fixing member 2. By moving the support member 3 in the second direction X, the tension in the second direction X of the belt 6 wound around the pulley 4 having the first direction Z orthogonal to the second direction X as the axial direction can be adjusted. With a simple configuration, the tension of the belt 6 wound around the pulley 4 can be adjusted.

[0054] The adjustment screw 5B extending in a direction intersecting the first direction Z and the second direction X presses the pressing surface 321 along the direction orthogonal to the second direction X. By adjusting the tightening amount of the adjustment screw 5B from the direction intersecting the first direction Z and the second direction X, the tension can be adjusted.

[0055] (Fourth Embodiment) The third embodiment of the tension adjustment mechanism and the opening fixture of the present disclosure will be mainly described with reference to FIGS. 11 and 12. In this figure, the same elements as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0056] As shown in FIGS. 11 and 12, the adjustment screw 5B is inserted into the adjustment screw hole 221B of the screw insertion portion 22B of the fixing member 2. The end portion 51B on the other side X2 in the second direction X of the adjustment screw 5B protrudes from the adjustment screw hole 221B to the other side X2 in the second direction X. The end portion 51B of the adjustment screw 5B presses the pressing surface 321A of the pressing portion 32A of the support member 3 to the other side Z2 in the first direction Z and the other side X2 in the second direction X. The pressing surface 321A receives a force on the other side Z2 in the first direction Z and the other side X2 in the second direction X. Due to the pressing force from the adjustment screw 5B, the support member 3 is movable to the other side X2 in the second direction X.

[0057] In the tension adjustment mechanism 1C and the automatic door 100 configured as described above, the adjustment screw 5B is inserted into the adjustment screw hole 221B of the screw insertion portion 22B of the fixing member 2. The adjustment screw 5B presses the pressing surface 321A of the pressing portion 32A provided on the support member 3 that supports the pulley 4. The pressing surface 321A along the direction intersecting the second direction X is pressed by the adjustment screw 5B, so that the support member 3 is movable in the second direction X with respect to the fixing member 2. By moving the support member 3 in the second direction X, the tension in the second direction X of the belt 6 wound around the pulley 4 having the first direction Z perpendicular thereto as the axial direction can be adjusted. With a simple configuration, the tension of the belt 6 wound around the pulley 4 can be adjusted.

[0058] The adjustment screw 5B extending in the direction intersecting the first direction Z and the second direction X presses the pressing surface 321A along the direction intersecting the first direction Z and the second direction X. By adjusting the tightening amount of the adjustment screw 5B from the direction intersecting the first direction Z and the second direction X, the tension can be adjusted.

[0059] As described above, the preferred embodiments according to the present disclosure have been described with reference to the accompanying drawings. Needless to say, the present disclosure is not limited to such examples. The various shapes, combinations, etc. of the respective constituent members shown in the above examples are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present disclosure.

[0060] In the embodiment described above, an automatic door has been described as an example of a door and window fitting at an opening where a tension adjustment mechanism is installed, but the present invention is not limited to this. The tension adjustment mechanism may be installed, for example, in a slide-type electric window or a conveying device.

Description of Reference Numerals

[0061] 1, 1A, 1B, 1C Tension adjustment mechanism, 2 Fixed member, 3 Support member, 4 Pulley, 5, 5A, 5B Adjusting screw, 21 Screw fixing portion, 22, 22A, 22B Screw insertion portion, 28 Screw, 31 Pulley support portion, 32, 32A Pressing portion, 35 Fixing screw 100 Automatic door (door and window fitting at an opening), 102 Upper frame, 212 Fixing screw hole, 221, 221A, 221B Adjusting screw hole, 312, 312A Long hole, 321, 321A Pressing surface, X Second direction Z First direction

Claims

1. A pulley rotatable with the first direction as the axial direction, a support member for supporting the pulley, a fixing member for fixing the support member movably in a second direction orthogonal to the first direction, an adjusting screw, and comprising: The fixing member has a screw insertion portion formed with an adjusting screw hole through which the adjusting screw can be inserted, The support member has a pressing portion formed with a pressing surface that extends along a direction intersecting the second direction and is pressed by the adjusting screw inserted into the adjusting screw hole, a tension adjustment mechanism.

2. The support member has a pulley support portion that forms a long hole long in the second direction and supports the pulley, The fixing member has a screw fixing portion formed with a fixing screw hole into which a fixing screw inserted through the long hole is screwed, the tension adjustment mechanism according to claim 1.

3. The pressing surface is arranged along a direction orthogonal to the second direction, The adjusting screw extends in the second direction, the tension adjustment mechanism according to claim 1.

4. The pressing surface is arranged along a direction intersecting the first direction and the second direction, The adjusting screw extends in the first direction, the tension adjustment mechanism according to claim 1.

5. The pressing surface is arranged along a direction orthogonal to the second direction, The adjusting screw extends in a direction intersecting the first direction and the second direction, the tension adjustment mechanism according to claim 1.

6. The pressing surface is arranged along a direction intersecting the first direction and the second direction, The adjusting screw extends in a direction intersecting the first direction and the second direction, the tension adjustment mechanism according to claim 1.

7. The tension adjustment mechanism according to claim 1 or 2, a belt wound around the pulley, a shoji that moves in accordance with the rotation of the belt, an opening fitting comprising.

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