JP2019138344A - Tension adjustment device, drive unit and movable platform fence - Google Patents

Abstract

To provide a tension adjustment device which adjusts tension generated in a power transmission belt by increasing/decreasing the substantial length of the power transmission belt, which has a simple structure, which is easy for miniaturization and which can easily adjust tension, in a belt pulley mechanism which is constituted by winding the power transmission belt between a drive pulley and a driven pulley.SOLUTION: A tension adjustment device includes: a base 11; a first connection part 12 which is fixed to the base 11, and to which one end of a toothed belt 9 is connected; and a second connection part 13 which can adjust position in the direction in parallel with the movement direction of the toothed belt 9, which is mounted on the base 11, and to which the other end of the toothed belt 9 is connected.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a tension adjusting device, a drive unit, and a movable home fence.

  A movable platform fence is a kind of automatic door device that is installed on a platform of a railway station and opens and closes a boarding passage for passengers to get on and off the train. In general, the movable platform fence includes a door pocket fixed to the platform and a door body that moves forward and backward while being supported by the door pocket.

  A belt / pulley mechanism is known as a driving mechanism for moving a door body forward and backward in a movable home fence. For example, the platform door described in Patent Literature 1 includes a motor fixed to a door pocket body, a drive pulley that is rotationally driven by the motor, a driven pulley that is pivotally supported by the door pocket, a drive pulley, and a driven pulley. It has a belt that can be wrapped around. And the belt is connected with the door body via the clamp member (patent documents 1, Drawing 7). With this configuration, when the drive pulley is driven to rotate by the motor, the belt circulates between the drive pulley and the driven pulley. Since the door body is connected to the belt via the clamp member, when the belt circulates between the driving pulley and the driven pulley, the door body is wound on the belt and moves forward and backward with respect to the door pocket.

  In the belt-pulley mechanism as described above, it is necessary to apply an appropriate tension to the belt so that the power of the motor is efficiently transmitted. If the belt tension is small, slippage occurs between the belt and the pulley, and as a result, the power transmission efficiency of the motor decreases, which is not preferable. If the belt tension is increased more than necessary, abnormal noise is generated and the life is shortened. In addition, since the belt is made of an elastic member such as rubber, the belt is stretched when used for a long period of time, and the belt tension is thereby lowered. When the belt is stretched and the tension is lowered, it is necessary to adjust the belt / pulley mechanism so that an appropriate tension is applied to the belt. Also, since the belt is a consumable part, it must be replaced periodically. When changing the belt, it is necessary to loosen the belt tension, remove the old belt from the pulley, engage the new belt with the pulley, and then apply the appropriate tension to the belt again.

  Therefore, in the belt / pulley mechanism, a tension adjusting device that adjusts the tension of the belt and applies an appropriate tension to the belt is required. Patent Document 1 also suggests that the driven pulley includes a tension adjusting mechanism that adjusts the belt tension (Patent Documents 1, 0081 paragraph, 0082 paragraph).

  Patent Document 2 discloses a configuration example of a tension adjusting mechanism that adjusts the belt tension by changing the attachment position of the driven pulley. The tension adjustment mechanism described in Patent Document 2 is configured by fixing an adjustment bracket that pivotally supports a driven pulley to a door body with a bolt (Patent Documents 2 and 2). Therefore, when the bolt is loosened, the attachment position of the adjustment bracket with respect to the door body can be changed. If the adjustment bracket is moved to a position where an appropriate tension is generated and the bolt is tightened, the adjustment bracket is fixed to the door body at that position (Patent Document 2, Specification Nos. 0029 to 0038).

  In addition, the tension adjusting device described in Patent Document 3 adjusts the belt tension by adjusting the length of the belt. For this purpose, the tension adjusting device described in Patent Document 3 includes a support plate, an adjustment wheel pivotally supported by the support plate, and a fixing unit that restrains rotation of the adjustment wheel. The adjustment wheel is formed with teeth that mesh with a toothed belt that is the target of tension adjustment. The one end of the toothed belt is wound around an adjustment wheel, and the other end of the toothed belt is fixed to a support plate via a bracket. According to this tension adjusting device, the tension of the toothed belt can be adjusted by rotating the adjusting wheel and adjusting the winding length of the toothed belt.

Japanese Patent Laid-Open No. 2006-164047 Japanese Patent Laid-Open No. 2006-155668 JP 2000-248827 A

  The tension adjusting mechanisms described in Patent Document 1 and Patent Document 2 release the fixation of the driven pulley and change the attachment position of the driven pulley when adjusting the belt tension, so the belt tension is adjusted each time. It is necessary to readjust the alignment between the driving pulley and the driven pulley. That is, it is necessary to readjust the position and the mounting angle of the driven pulley so that the parallelism and twist between the driving pulley and the driven pulley are within the allowable range. This is because if the alignment between the driving pulley and the driven pulley is poor, the belt is twisted or the belt hits the driving pulley or the driven pulley. Therefore, there is a problem that it takes time to adjust the belt tension by the tension adjusting mechanism described in Patent Document 1 and Patent Document 2.

  When the belt tension is adjusted by the tension adjusting device described in Patent Document 3, the driven pulley is not released, so that it is not necessary to readjust the alignment between the driving pulley and the driven pulley. Therefore, belt tension adjustment by the tension adjusting device described in Patent Document 3 is easier and less labor-intensive than belt tension adjustment by the tension adjusting mechanism described in Patent Document 2.

  However, since the tension adjusting device described in Patent Document 3 uses an adjusting wheel for winding a toothed belt as an essential component, there is a problem that it is difficult to reduce the size of the device. This is because the bending radius of the toothed belt is limited, and the toothed belt cannot be wound with a radius smaller than the minimum bending radius. That is, the radius of the adjusting wheel cannot be made smaller than the minimum bending radius of the toothed belt. Further, in the tension adjusting device described in Patent Document 3, since it is necessary to arrange an adjusting wheel between the driving pulley and the driven pulley, the diameter of the driving pulley and the driven pulley is at least larger than the diameter of the adjusting wheel. It needs to be bigger. Therefore, if the belt / pulley mechanism is provided with the tension adjusting device described in Patent Document 3, it is difficult to reduce the size of the belt / pulley mechanism.

  The present invention has been made under such a background. In the belt-pulley mechanism, the tension adjusting device adjusts the tension generated in the power transmission belt by increasing or decreasing the substantial length of the power transmission belt. Another object of the present invention is to provide a tension adjusting device that has a simple structure, is easy to miniaturize, and can easily adjust tension. Moreover, it aims at providing a drive unit and a movable home fence provided with this tension adjusting device.

  The tension adjusting device according to the present invention includes a base, a first connecting portion fixed to the base and connected to one end of the power transmission belt, and free position adjustment in a direction parallel to the moving direction of the power transmission belt. And a second connecting part that is attached to the base and to which the other end of the power transmission belt is connected.

  According to the present invention, it is possible to provide a tension adjusting device that has a simple structure and can be easily downsized. According to the tension adjusting device of the present invention, the tension of the power transmission belt can be easily adjusted in the belt / pulley mechanism. Further, since the tension adjusting device according to the present invention can be easily downsized, if the tension adjusting device according to the present invention is provided in the drive unit or the drive mechanism of the movable home fence, the drive unit or the drive mechanism of the movable home fence can be reduced in size. It becomes easy.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the fundamental structure and effect | action of the movable home fence which concerns on embodiment, Comprising: (A) is a front view which sees the movable home fence in a closed door state from a platform side, (B) is in a door open state Front view of a movable platform fence viewed from the platform side It is a figure which shows the detailed structure of the tension adjusting device with which the movable home fence of FIG. 1 is equipped, Comprising: (A) is a top view which looks at a tension adjusting device from upper direction, (B) looks at a tension adjusting device from a home side. Front view, (C) is a side view of the tension adjusting device viewed from the direction indicated by arrow C in (A), and (D) is a cross section of the tension adjusting device taken along the plane indicated by line D ₁ -D ₂ in (A). Figure (A)-(D) is a figure which shows the effect | action of the tension adjusting apparatus shown in FIG. 2, Comprising: The figure which shows the procedure which adjusts the tension | tensile_strength of a toothed belt by operating a tension adjusting apparatus along a time series. It is a figure which shows the structure of the tension adjustment apparatus which concerns on a 1st modification, Comprising: It is a front view corresponding to FIG. 2 (B) It is a figure which shows the structure of the tension | tensile_strength adjustment apparatus which concerns on a 2nd modification, Comprising: (A) is a front view corresponding to FIG.2 (B), (B) is sectional drawing corresponding to FIG.2 (D). It is a figure which shows the structure of the tension | tensile_strength adjustment apparatus which concerns on a 3rd modification, Comprising: The front view corresponding to FIG. 2 (B) It is a figure which shows the structure of the tension | tensile_strength adjustment apparatus which concerns on a 4th modification, Comprising: Front view corresponding to FIG. 2 (B) It is a figure which shows the structure of the tension | tensile_strength adjustment apparatus which concerns on a 5th modification, Comprising: Front view corresponding to FIG. 2 (B)

  Hereinafter, a movable home fence according to an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are denoted by the same reference numerals.

  FIG. 1 is an explanatory view showing a basic configuration of a movable home fence 1 according to an embodiment of the present invention, and FIG. 1 (A) is a front view of the movable home fence 1 in a closed state as viewed from the platform side. FIG. 1B is a front view of the movable home fence 1 in the open state as viewed from the platform side.

  As shown in FIGS. 1 (A) and 1 (B), the movable platform fence 1 includes a door pocket 3 fixed to the floor surface 2 of the platform, a door body 4 supported by the door pocket 3 so as to freely advance and retract, and a door pocket 3. A drive unit 5 that is fixed and moves the door 4 forward and backward with respect to the door pocket 3 is provided. The floor 2 is an example of an installation place where the door pocket 3 is fixed. The door pocket 3 is an example of a fixed portion to which the drive unit 5 is fixed, and the door body 4 is an example of a driven portion that is driven by the drive unit 5.

  The door pocket 3 includes a base 3 a and a base 3 b that are spaced apart from each other on the door end side and the door bottom side and are fixed to the floor surface 2. A lower horizontal frame 3c is bridged between the base 3a and the base 3b. The lower horizontal frame 3c is a frame material that is disposed at the lower part of the door pocket 3 and extends from the door tip side to the door butt side, and the end portions on the door tip side and the door butt side are respectively attached to the two bases 3a. It is fixed. A door-side vertical frame 3d is fixed to the base 3a arranged on the door-side, and a door-side vertical frame 3e is fixed to the base 3b arranged on the door-side. The door end side vertical frame 3d and the door bottom side vertical frame 3e are frame members extending in the vertical direction, and an upper horizontal frame 3f is bridged between both. The upper horizontal frame 3f is a frame material that is disposed on the upper portion of the door pocket 3 and extends from the door tip side to the door butt side, and both ends thereof are the upper end of the door tip side vertical frame 3d and the door butt side vertical frame, respectively. It is fixed to the upper end of 3e. A lower guide rail 3g is fixed to the upper surface of the lower horizontal frame 3c, and an upper guide rail 3h is fixed to the lower surface of the upper horizontal frame 3f. In addition, although the outline of the door pocket 3 is covered with the panel 3i, in FIG. 1 (A), (B), the state which removed the part which covers the side surface by the side of the home side of the door pocket 3 in the panel 3i is shown. Yes.

  As shown in FIGS. 1 (A) and 1 (B), a lower bracket 4b extending from the end of the main body 4a on the door butt side to the door butt side is fixed to the lower portion of the main body 4a of the door body 4. A lower rolling wheel 4c that rolls in contact with the lower guide rail 3g is pivotally supported on the lower bracket 4b. Further, an upper bracket 4d extending from the end of the main body 4a on the door butt side to the door butt side is fixed to the upper portion of the main body 4a of the door body 4. An upper rolling wheel 4e that rolls in contact with the upper guide rail 3h is pivotally supported on the upper bracket 4d. With this configuration, when the lower rolling wheel 4c and the upper rolling wheel 4e roll in contact with the lower guide rail 3g and the upper guide rail 3h, respectively, the door body 4 moves forward and backward with respect to the door pocket 3. .

  The drive unit 5 includes a drive motor 6, a drive pulley 7, and a driven pulley 8. The drive motor 6 is fixed to the door pocket 3 via a drive-side bracket 3j fixed to the door-side vertical frame 3e, and the drive pulley 7 is rotationally driven by the drive motor 6. The driven pulley 8 is pivotally supported by a driven bracket 3k fixed to the door end side vertical frame 3d. Thus, the driven pulley 8 is disposed at a position separated from the drive pulley 7 in the forward / backward direction of the door body 4 and is pivotally supported by the door pocket 3. The drive motor 6 is an example of a rotating machine that rotationally drives the drive pulley 7.

  In addition to the above, the drive unit 5 includes a toothed belt 9 and a tension adjusting device 10. The toothed belt 9 is an example of a power transmission belt that is a target of tension adjustment by the tension adjustment device 10, and one end and the other end are connected to the tension adjustment device 10 to constitute an endless power transmission belt as a whole. The drive pulley 7 and the driven pulley 8 are wound around. The tension adjusting device 10 is a device that is fixed to the door body 4 via the lower bracket 4b and that one end and the other end of the toothed belt 9 are connected to each other. As will be described later, according to the tension adjusting device 10, the substantial length of the toothed belt 9 can be adjusted to adjust the magnitude of the tension applied to the toothed belt 9.

  Next, the operation of the movable home fence 1 will be described. In the state shown in FIG. 1A, when the drive motor 6 is operated and the drive pulley 7 is rotated counterclockwise, that is, in the direction indicated by the arrow CCW, the toothed belt 9 is driven by the drive pulley 7 and the driven pulley 8. Circulates in a counterclockwise direction. Therefore, the tension adjusting device 10 moves in the direction indicated by the arrow Iwd. Since the tension adjusting device 10 is fixed to the lower bracket 4 b, when the tension adjusting device 10 moves in the direction indicated by the arrow Iwd, the door body 4 is driven by the tension adjusting device 10 and pulled into the door pocket 3. As a result, the door body 4 moves to the position shown in FIG.

  In the state shown in FIG. 1B, when the drive motor 6 is operated and the drive pulley 7 is rotated clockwise, that is, in the direction indicated by the arrow CW, the toothed belt 9 is moved between the drive pulley 7 and the driven pulley 8. Cycle between them clockwise. Therefore, the tension adjusting device 10 moves in the direction indicated by the arrow Owd. Since the tension adjusting device 10 is fixed to the lower bracket 4 b, when the tension adjusting device 10 moves in the direction indicated by the arrow Owd, the door body 4 is pushed by the tension adjusting device 10 and pulled out of the door pocket 3. As a result, the door body 4 moves to the position shown in FIG.

  Thus, the drive unit 5 functions as a drive mechanism that causes the door 4 to move forward and backward with respect to the door pocket 3. That is, in the drive unit 5, when the drive motor 6 is operated and the drive pulley 7 is rotated, the door body 4 advances and retreats with respect to the door pocket 3.

  Now, in order for the drive unit 5 to operate smoothly, it is necessary to apply an appropriate tension to the toothed belt 9. If the tension applied to the toothed belt 9 is small, the drive pulley 7 may idle, the toothed belt 9 may not move, and the door body 4 may not advance or retreat. If the tension applied to the toothed belt 9 is too large, the drive pulley 7 and the driven pulley 8 may fail. Therefore, the drive unit 5 includes a tension adjusting device 10 so that the tension applied to the toothed belt 9 can be freely adjusted.

2A and 2B are diagrams showing a detailed configuration of the tension adjusting device 10, in which FIG. 2A is a plan view of the tension adjusting device 10 viewed from above, and FIG. It is a top view seen from the side. FIG. 2 (C) is a side view seen from the direction indicated by the arrow C in FIG. 2 (A) the tension adjusting device 10, FIG. 2 _(D) D 1 a tensioning device 10 in FIG. 2 (A) -D It is sectional drawing cut | disconnected and shown by the plane shown by ₂ lines.

  As shown in FIGS. 2A to 2D, the tension adjusting device 10 includes a base 11, a first connecting portion 12, and a second connecting portion 13. The base 11 is a part having an inverted L-shaped side surface, is attached so that the long side of the inverted L-shape is in contact with the lower bracket 4b, and is fixed to the lower bracket 4b with a bolt 11a. The first connecting portion 12 is a component to which one end of the toothed belt 9 is connected, and is fixed to the base 11 with a bolt 12a. The second connecting portion 13 is a component to which the other end of the toothed belt 9 is connected, and is attached to the base 11 with a bolt 13a.

  As shown in FIG. 2A, the base 11 has a long hole 11b, and the bolt 13a is inserted into the long hole 11b. Therefore, the 2nd connection part 13 can be moved in parallel with the moving direction of the toothed belt 9 by moving the volt | bolt 13a within the elongate hole 11b. That is, the position of the second connecting portion 13 in the moving direction of the toothed belt 9 can be freely adjusted. Since it is comprised in this way, the space | interval between the 1st connection part 12 and the 2nd connection part 13 can be changed freely. If the distance between the first connecting part 12 and the second connecting part 13 is changed, the substantial length of the endless power transmission belt constituted by connecting both ends of the toothed belt 9 to the tension adjusting device 10 will be described. Is changed. As shown in FIGS. 2C and 2D, the first connecting portion 12 and the second connecting portion 13 have tooth grooves 12b and 13b having substantially the same shape as the tooth profile of the toothed belt 9, respectively. Is formed. The toothed belt 9 is fitted into the tooth grooves 12 b and 13 b and connected to the first connecting portion 12 and the second connecting portion 13.

  Thus, according to the tension adjusting device 10, the interval between the first connecting portion 12 and the second connecting portion 13 can be freely changed. When the drive unit 5 is attached to the movable home fence 1, that is, in the state shown in FIG. 1, if the interval between the second connecting portion 13 and the first connecting portion 12 is reduced, the load on the toothed belt 9 is increased. The tension that is applied increases. If the interval between the second connecting portion 13 and the first connecting portion 12 is increased, the tension applied to the toothed belt 9 is reduced. Therefore, according to the tension adjusting device 10, the magnitude of the tension applied to the toothed belt 9 can be adjusted.

  As shown in FIG. 2D, the first connecting portion 12 and the second connecting portion 13 are provided with through holes 12c and 13c, and the through holes 12c and 13c are provided with distance adjusting bolts. 14 is inserted. In addition, three nuts 15a, 15b, and 15c are screwed to the interval adjusting bolt 14. The bolt head 14 a and the nut 15 a of the distance adjusting bolt 14 are disposed so as to sandwich the first connecting portion 12, and the nut 15 b and the nut 15 c are disposed so as to sandwich the second connecting portion 13. Therefore, the interval adjusting bolt 14 is fixed to the first connecting portion 12 by tightening the nut 15a. The second connecting portion 13 is fixed to the distance adjusting bolt 14 by tightening the nut 15b and the nut 15c in a direction approaching each other. The interval adjusting bolt 14 and the nuts 15a, 15b, and 15c are examples of the interval adjusting means provided in the tension adjusting device 10.

  Next, a procedure for adjusting the tension applied to the toothed belt 9 by operating the tension adjusting device 10 will be described with reference to FIGS. In the following, a procedure for adjusting the tension applied to the toothed belt 9 in the direction of increasing will be described.

When adjusting the tension of the toothed belt 9, first, the fixed state of the second connecting portion 13 with respect to the base 11 is released. That is, as shown in FIG. 3A, the bolt 13a is loosened so that the bolt 13a can move in the elongated hole 11b. Incidentally, as shown in FIG. 3 (A), at this time, that is, in a state before the adjustment of the tension of the toothed belt 9, a first connecting portion 12 a second connecting portion 13, separated by a distance S ₁ doing.

Next, the nut 15b is loosened, and the nut 15b is moved to the door end side by a desired distance as shown in FIG. At this time, the second connecting portion 13 is still in the original position. Therefore, the nut 15c is turned to move the nut 15c toward the door end side. When the nut 15c is moved toward the door end side, the second connecting portion 13 is pushed by the nut 15c and moves toward the door end side as shown in FIG. Moreover, the 2nd connection part 13 is fixed to the space | interval adjustment volt | bolt 14 by being pinched | interposed between the nut 15b and the nut 15c in the moved position. At this time, the first connecting portion 12 spacing S ₂ between the second connecting portion 13 is smaller than the spacing S ₁ in the state shown in Figure 3 (A). That is, as a result of the above operation, the interval between the first connecting portion 12 and the second connecting portion 13 is narrowed. Therefore, the other end of the toothed belt 9 is drawn toward one end. In the state shown in FIG. 1, if the above operation is performed on the tension adjusting device 10, the tension applied to the toothed belt 9 increases. Finally, as shown in FIG. 3D, the bolt 13 a is tightened to fix the second connecting portion 13 to the base 11.

  In addition, when adjusting to the direction which reduces the tension | tensile_strength loaded on the toothed belt 9, the 2nd connection part 13 is moved to the reverse direction. That is, after loosening the bolt 13a to the state shown in FIG. 3A, the nut 15c is loosened, the nut 15c is moved to the door butt side, and then the nut 15b is turned so that the nut 15b and the second The connecting portion 13 is moved to the door bottom side. Finally, the bolt 13 a is tightened to fix the second connecting portion 13 to the base 11.

(Modification 1)
The tension adjusting device 10 may be configured as shown in FIG. That is, in addition to the interval adjustment bolt 14, an interval adjustment bolt 14A may be provided. The spacing adjustment bolt 14 </ b> A is disposed in parallel with the spacing adjustment bolt 14, passes through the first coupling portion 12 and the second coupling portion 13, and is fixed to the first coupling portion 12 and the second coupling portion 13. Has been. Further, the toothed belt 9 is disposed between the interval adjusting bolt 14 and the interval adjusting bolt 14 </ b> A, and is fixed to each of the first connecting portion 12 and the second connecting portion 13. Therefore, even if the bolt 13a is loosened and the fixed state of the second connecting portion 13 with respect to the base 11 is released, the second connecting portion 13 receives the tension of the toothed belt 9 so that the second connecting portion 13 is There is no inclination with respect to the connecting portion 12. That is, even if the fixed state of the second connecting portion 13 with respect to the base 11 is released, the first connecting portion 12 and the second connecting portion 13 can be kept parallel to each other. As a result, the second connecting portion 13 can be easily moved.

(Modification 2)
The interval adjusting means provided in the tension adjusting device 10 is not limited to the combination of the interval adjusting bolt 14 and the nuts 15a, 15b, 15c. As shown in FIGS. 5A and 5B, the first connecting portion 12 and the second connecting portion 12 are provided with a distance adjusting bolt 14B having a left screw 14L on one side and a right screw 14R on the other side. The left screw 14L and the right screw 14R may be screwed into the connecting portion 13 respectively. In the tension adjusting device 10 shown in FIG. 5, if the bolt 13 a is loosened and the interval adjusting bolt 14 </ b> B is rotated, the second connecting portion 13 moves forward and backward with respect to the first connecting portion 12. When a desired tension is generated in the toothed belt 9, the tension adjustment is completed by tightening the bolt 13a and fixing the position of the second connecting portion 13.

(Modification 3)
In the above, tooth grooves 12b and 13b are formed in the first connecting portion 12 and the second connecting portion 13, and the tooth shape of the toothed belt 9 is meshed with the tooth grooves 12b and 13b. The example connected to the 1st connection part 12 and the 2nd connection part 13 was shown. In addition, as shown in FIG. 6, the retaining plate 16 may be placed at the entrances of the tooth grooves 12b and 13b and fixed with bolts 16a. If the retaining plate 16 is provided, it is possible to prevent the toothed belt 9 from falling off from the first connecting portion 12 and the second connecting portion 13.

(Modification 4)
In the above, the example in which the first connecting portion 12 is configured separately from the base 11 and is fixed to the base 11 with the bolts 13 a has been shown, but means for fixing the first connecting portion 12 to the base 11 Is not limited to the bolt 13a. The 1st connection part 12 should just be fixed to the base 11 by various arbitrary means. Or as shown in FIG. 7, the base 11 and the 1st connection part 12 may be comprised integrally.

(Modification 5)
In the above, an example in which the tension adjusting device 10 is provided with the interval adjusting means has been described. However, the interval adjusting means, that is, the interval adjusting bolt 14 and the like are arbitrary components and are not essential components. As shown in FIG. 8, a configuration in which the tension adjusting device 10 is not provided with the interval adjusting bolt 14 or the like may be an option. In this case, the tension is adjusted by attaching a special jig for moving the second connecting portion 13 to the tension adjusting device 10 as necessary. Further, in order to facilitate the attachment of such a dedicated jig / tool, the first connecting portion 12 or the second connecting portion 13 may be provided with a recess or a protrusion that fits into the exclusive jig / tool.

  As described above, according to the tension adjusting device 10 according to the embodiment and the first to fifth modifications, in the belt / pulley mechanism including the toothed belt 9 that circulates between the driving pulley 7 and the driven pulley 8. The magnitude of the tension generated in the toothed belt 9 can be adjusted by increasing or decreasing the substantial length of the toothed belt 9. According to the tension adjusting device 10, since it is not necessary to change the mounting position of the driven pulley 8 when adjusting the magnitude of the tension generated in the toothed belt 9, the driving pulley 7 and the driven pulley after the tension adjustment is completed. There is no need to readjust the alignment between 8. Therefore, the tension adjustment of the toothed belt 9 is facilitated as a whole. That is, the labor required for adjusting the tension of the toothed belt 9 can be reduced.

  Further, since the tension adjusting device 10 includes only the base 11, the first connecting portion 12, and the second connecting portion 13, the structure is simple and can be manufactured at low cost. Further, the dimensions of the first connecting portion 12 and the second connecting portion 13 are not limited by the minimum bending radius of the toothed belt 9. Therefore, the tension adjusting device 10 can be easily downsized. If the tension adjusting device 10 can be downsized, the drive unit 5 can be easily downsized. If the drive unit 5 can be downsized, the movable home fence 1 can be easily downsized.

  If the tension adjusting device 10 includes a distance adjusting means such as a distance adjusting bolt 14, the position of the second connecting portion 13 can be easily adjusted, so that the tension of the toothed belt 9 can be easily adjusted. Further, if the two spacing adjusting bolts 14 and 14A are arranged in parallel, the first connecting portion 12 and the second connecting portion 13 remain in a state of being arranged in parallel, and the second connecting portion 13 Since the position can be adjusted, the tension of the toothed belt 9 can be adjusted more easily.

  However, the technical scope of the present invention is not limited by the embodiment and the first to fifth modifications. The present invention can be practiced by being freely applied, modified or improved within the scope of the technical idea described in the claims.

  In the above, the toothed belt 9 is illustrated as a specific example of the power transmission belt, but the target of tension adjustment by the tension adjusting device 10 is not limited to the toothed belt 9. The power transmission belt may be a flat belt, a V belt, a round belt, or a belt having another shape.

  In the above, the tension adjusting device 10 includes the base 11, and the base 11 is fixed to the lower bracket 4 b of the door body 4, but the first connecting portion 12 and the second connecting portion 13 are You may make it attach to the main body 4a or the lower bracket 4b of the door body 4 directly. That is, the main body 4a or the lower bracket 4b may also serve as the base 11 of the tension adjusting device 10.

  The belt / pulley mechanism to which the tension adjusting device 10 is attached is not limited to the mechanism that drives the movable home fence 1 or the automatic door device. The tension adjusting device 10 can be used by being attached to a belt / pulley mechanism for driving various industrial machines or consumer devices.

  The drive unit 5 is not limited to what is attached to the movable home fence 1 and drives the door body 4 of the movable home fence 1. The drive unit 5 can be used by being attached to various industrial machines or consumer equipment.

1 movable platform fence, 2 floor surface, 3 door pockets, 3a, 3b base, 3c lower horizontal frame, 3d door end side vertical frame, 3e door bottom side vertical frame, 3f upper horizontal frame, 3g lower guide rail, 3h upper guide Rail, 3i panel, 3j drive side bracket, 3k driven side bracket, 4 door body, 4a body, 4b lower bracket, 4c lower rolling wheel, 4d upper bracket, 4e upper rolling wheel, 5 drive unit, 6 drive motor, 7 drive Pulley, 8 driven pulley, 9 toothed belt, 10 tension adjusting device, 11 base, 11a bolt, 11b long hole, 12 first connecting part, 12a bolt, 12b tooth groove, 12c through hole, 13 second connecting part , 13a Bolt, 13b Tooth groove, 13c Through hole, 14, 14A, 14B Spacing adjustment bolt, 14L Left-hand thread, 14R Right-hand thread, 14a Bolt head, 15a, 15b, 15c Nut, 16 Retaining plate, 16a Bolt

Claims (7)

Base and
A first connecting portion fixed to the base and connected to one end of the power transmission belt;
A second connecting portion that is freely adjustable in a direction parallel to the moving direction of the power transmission belt, is attached to the base, and is connected to the other end of the power transmission belt;
Tension adjustment device. An interval adjusting means for adjusting the interval between the first connecting portion and the second connecting portion by moving the second connecting portion forward and backward with respect to the first connecting portion;
The tension adjusting device according to claim 1. The interval adjusting means includes
One end is fixed to the first connecting portion, the other end is inserted into the second connecting portion, and the bolt penetrates the second connecting portion.
Two nuts that are screwed into the bolts and sandwich the second connecting part therebetween to fasten the bolts to the second connecting part.
The tension adjusting device according to claim 2. Two sets of the interval adjusting means including the bolt and the two nuts,
The two sets of the interval adjusting means are arranged in parallel to each other.
The tension adjusting device according to claim 3. A rotating machine fixed to the fixed part;
A drive pulley that is rotationally driven by the rotating machine;
A driven pulley that is disposed at a position separated from the drive pulley and is pivotally supported by the fixed portion;
The tension adjusting device according to any one of claims 1 to 4, wherein the tension adjusting device is fixed to a driven part;
A power transmission belt that is wound around the drive pulley and the driven pulley, and has one end and the other end fixed to the tension adjusting device to constitute an endless power transmission belt as a whole,
Drive unit. A door pocket fixed at the installation location;
A door body supported by the door pocket so as to freely advance and retract;
The drive unit according to claim 5, wherein the rotating machine is fixed to the door pocket, and the tension adjusting device is fixed to the door body.
Movable home fence. A door pocket fixed at the installation location;
A door body supported by the door pocket so as to freely advance and retract;
A rotating machine fixed to the door pocket;
A drive pulley that is rotationally driven by the rotating machine;
A driven pulley that is arranged at a position separated from the drive pulley in the advancing and retreating direction of the door body and is pivotally supported by the door pocket;
The tension adjusting device according to any one of claims 1 to 4, wherein the base is fixed to the door body,
A power transmission belt wound around the drive pulley and the driven pulley and having one end and the other end fixed to the tension adjusting device and constituting an endless power transmission belt as a whole,
Movable home fence.

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