JP2014118737A - Tension giving mechanism of awning device - Google Patents

Abstract

An awning device that facilitates assembly work of a tension applying mechanism, includes a dedicated jig or device, and can adjust a reaction force of a spring.
A base end of an arm that supports both ends of a front frame that supports a front end edge of a canvas is rotatably attached to a housing wall surface via a bracket, and the arm is centered on a connecting shaft of the bracket. In the awning device in which the canvas 1 is pulled out from the take-up device 6 installed on the daylighting opening 6 and extended to the front of the daylighting opening 6 by pulling the canvas 1 inside the arm 3 A spring connecting a wire and a wire is built-in, and the tension of the spring can be adjusted by operating the axial movement means to move the connecting member in the longitudinal direction of the arm 3. A tension applying mechanism having a structure in which tension is applied to the canvas 1 so as to always give a moment of rotating downward about the center of the canvas 1 is provided.
[Selection] Figure 1

Description

  The present invention relates to an awning device (an awning) that can be opened and closed and is attached to a window of a building. More specifically, the present invention relates to a tension applying mechanism of an awning device that applies tension to a canvas through an arm that supports a front frame of a front edge of the canvas.

  As an awning device that projects the canvas in front of the daylighting opening as needed, the base end of the arm that supports both ends of the front frame that supports the leading edge of the canvas is pivotally attached to the frame wall surface, and the arm is tilted. An awning device (referred to as a drop arm type awning device) is known in which the awning is pulled out from a winding device installed on a window frame while projecting from the winder device. In this type of awning device, as shown in FIG. 7, an arm 101 in which a tension spring 102 and a wire 103 are connected is built in, and one end of the tension spring 102 is connected to the tip (plug) 104 of the arm 101. At the same time, one end 107 of the wire 103 is wound around the pulley (or rotating shaft) 106 of the bracket 105 and then attached to the housing wall surface 108, whereby the arm 101 is rotated downward about the pivot axis by the force of the spring 102. There has been proposed one provided with a tension applying mechanism having a structure in which a tension is applied to the canvas 109 so as to always apply a moment (Patent Documents 1 and 2).

  Here, the wire 103 having one end fixed to the tension spring 102 is wound around a pulley (or a rotating shaft) 106 of the bracket 105, and the direction of the wire 103 is changed, and then the end 107 is attached to the housing wall surface 108. As the inclination angle of the arm 101 changes, the winding angle of the wire 103 around the pulley 106 changes. Thereby, the substantial length of the wire 103 is changed by the inclination of the arm 101, and the force applied to the tension spring 102 is adjusted. For example, when the canvas 109 is completely wound around the winding device 110 and the arm 101 stands along the wall surface 108, the winding angle of the wire 103 becomes the largest and the substantial length of the wire 103 becomes short, and the tension spring 102 is provided in a pulled state. For this reason, the tension at the rotation shaft changes depending on the rotation angle of the arm 101, and the tension of the tension spring 102 also changes accordingly.

No. 4-8171 JP 2011-94407 A

  However, in the tension applying mechanism in the conventional awning device, it is necessary to assemble the tension spring and the wire connected to the arm in a state where the necessary minimum tension is applied. Because power is required, assembly work is not easy, and production equipment with dedicated jigs and devices is required.

  In addition, it is necessary to prepare a large number of arms or members equipped with an elastic member having a reaction force necessary to support various screen sizes and weights.

  In addition, since the structure is such that the tension applied to the wire during assembly is completely fixed as a minimum value, adjustment cannot be performed after assembly. For this reason, if the initial tension is too strong, a large force is required to wind up the awning. On the other hand, if the initial tension is too weak, the awning becomes slack. Even if the tension is adjusted to an optimum value at the time of manufacture, if the components such as the spring and the wire are stretched due to secular change, the tension applied to the awning becomes weak and the awning becomes loose.

  An object of the present invention is to provide a tension applying mechanism for an awning device that is easy to assemble and does not require production equipment equipped with a dedicated jig or device. Another object of the present invention is to provide a tension applying mechanism for an awning device that can adjust a reaction force of a spring.

  In order to achieve such an object, the tension applying mechanism of the awning device according to claim 1 is configured such that the base ends of the arms supporting both ends of the front frame supporting the leading edge of the canvas are rotatably attached to the frame wall surface via the bracket. In the awning device that projects the canvas from the take-up device installed on the daylighting opening by extending the inclination of the arm around the connecting shaft of the bracket, The arm has a built-in structure in which a tension spring and a wire are connected, and a support member fixed to the arm, and a connection provided to the support member so as to be movable in the longitudinal direction of the arm via an axial movement means And attaching one end of the spring to the connecting member, and winding one end of the wire around the pulley portion of the bracket before mounting the bracket or the housing The spring tension can be adjusted by moving the connecting member in the longitudinal direction of the arm by operating the axial movement means, and the moment that rotates downward on the arm around its pivot axis by the force of the spring. I always give tension to the canvas.

  The tension applying mechanism of the awning device according to the present invention includes an axial movement in which the support member is fitted and fixed to the opening at the tip of the arm, and the connection member is supported by the support member so as to be movable in the longitudinal direction of the arm. The operating portion of the means is exposed outside the arm, and the connecting member is moved within the arm by operating the operating portion exposed at the tip of the arm so that the tension of the tension spring can be adjusted.

  Further, the tension applying mechanism of the awning device of the present invention includes an arm having a support member fixed to the distal end, a bracket for rotatably supporting the proximal end side of the arm, and an axial movement means operable from the outside of the arm. A connecting member that is connected to the supporting member in the arm so as to be movable in the longitudinal direction of the arm through the arm, and a member in which a tension spring and a wire are connected is built in the arm, and one end of the tension spring is connected It is unitized by fixing to a member and fixing one end of a wire around the pulley part of the bracket, and then fixing to the bracket.

  Further, the tension applying mechanism of the awning device according to the present invention is such that the support member is rotatably connected to the bracket at the base end of the arm and is in contact with the bearing tube that supports the base end of the arm. In this support cylinder, a tension spring and a wire are connected, and one end of the wire is engaged with a mooring groove of the bracket and the connecting member is moved in the longitudinal direction of the arm with respect to the support member. When the tension is applied to the tension spring by adjusting the axial movement means, it is unitized by integrating the bearing cylinder and the support cylinder. It is characterized by being.

  Further, the axial direction moving means in the tension applying mechanism of the awning device of the present invention is a feed screw mechanism, and the connecting member is moved in the longitudinal direction of the arm by the rotation of the screw.

  According to the tension applying mechanism of the awning device according to the first aspect, the tension spring can be loosened by moving the connecting member relative to the support member during the assembling work, so that it is not necessary to strongly pull the wire during assembling. For this reason, when hooking the wire on the hooking portion of the bracket, no special equipment is required, and there is no risk of injury to the worker even if the wire is missed and jumps. As a result, production facilities can be simplified, cost and space can be reduced, assembly work is easy, and the working environment can be improved. Moreover, a desired tension can be applied to the wire by moving the connecting member by operating the axial movement means after the wire is hooked.

  Further, according to the tension applying mechanism of the awning device according to claim 1, since the tension spring can be changed and adjusted easily by moving the connecting member after setting the tension spring and the wire, It is possible to apply tension corresponding to awnings of various sizes and weights by the arm. That is, the tension applied when the tension applying mechanism is assembled is not uniform and can be adjusted according to the area of the canvas.

  According to the tension applying mechanism of the awning device according to the invention of claim 2, wherein the operating portion of the axial movement means is exposed to the outside of the arm, in other words, after the arm is fixed to the housing wall surface, in other words, the awning device. Even during use, the tension of the tension spring can be adjusted by manipulating the operating part exposed at the tip of the axial movement means. When the power is weakened, the slack can be eliminated by adjusting the tension. Further, according to the tension applying mechanism of the awning device of the present invention, the spring force can be adjusted even after the assembly, so that the tension applied to the canvas can be adjusted according to the user's preference or the wind is strong. The spring can be strengthened when suppressing the flapping of the canvas.

  Furthermore, according to the tension applying mechanism of the awning device according to the invention as claimed in claim 3 or 4, the assembly of the awning device at the construction site is extremely simple and a significant improvement in workability can be expected.

  In addition, a desired tension can be applied to the wire by tightening the bolt after hooking the wire.

  When the axial direction moving means is constituted by a feed screw mechanism, the connecting member can be moved in the longitudinal direction of the arm by the rotation of the screw, so that no special tool is required and the operation is easy.

It is a side view which shows one Embodiment of the awning apparatus to which the tension | tensile_strength provision mechanism of this invention is applied. It is a half cut front view of the awning apparatus. It is a figure which shows one Embodiment of the tension | tensile_strength provision mechanism of the awning apparatus concerning this invention, (A) is a center longitudinal cross-sectional view, (B) is a front view of an arm front-end | tip. It is a figure which shows an example of the bracket used for the tension | tensile_strength provision mechanism, (A) is a center longitudinal cross-sectional view, (B) is a bottom view. It is a perspective view which shows the external appearance of the arm and bracket which applied other embodiment of the tension | tensile_strength provision mechanism concerning this invention. It is the center longitudinal cross-sectional view of the arm and bracket. It is sectional drawing which shows the tension | tensile_strength provision mechanism of the conventional awning apparatus.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  1 and 2 show an embodiment of an awning device to which the tension applying mechanism of the present invention is applied. This awning device is generally called a drop arm type awning, and the base of a pair of left and right arms 3 that support both ends of a front frame 2 that supports the leading edge of the canvas 1 is attached to a building / frame via brackets 4. A building / frame on a lighting opening (such as a window) that is not shown in the drawing, the winding device 6 that is rotatably attached to the wall surface 5 and wound up the rear edge of the canvas 1 on a winding shaft (not shown) By simply pulling out or winding the canvas 1 while changing the inclination of the arm 3 around the connecting shaft 7 of the bracket 4 only by rotating the winding shaft of the canvas 1 while being fixed to the wall surface 5, The canvas 1 can be extended and held forward as needed.

  Here, as shown in FIG. 3, tension is applied to the canvas 1 so that the arm 3 is constantly given a moment to rotate downward about the pivot (connecting shaft 7) by the force of the spring. Built-in structure tensioning mechanism. The tension applying mechanism of the present invention includes a member connecting a tension spring 8 and a wire 9 built in the arm, and one end of the tension spring swings around a connecting shaft (rotating shaft) 7 of the bracket 4. Are attached to a connecting member 21 provided to be movable in the longitudinal direction of the arm 3 with respect to the support member 10 fixed at a certain position from the bracket 4 on the arm 3 side, and at one end of the wire 9 Is wound around the pulley portion 24 of the bracket 4 and then fixed to the bracket or the wall surface of the building / frame, so that a moment of rotating downward about the pivot axis is always applied to the arm by the force of the spring.

  For example, FIGS. 3 and 4 show an embodiment of a tension applying mechanism. The tension applying mechanism according to this embodiment includes a structure in which a tension spring 8 and a wire 9 are connected to each other inside the arm 3, and one end of the tension spring 8 is fitted and fixed to the tip opening of the arm 3. It is attached to a connecting member 21 supported so as to be movable in the longitudinal direction of the arm 3 via a screw mechanism as an axial direction moving means 15 with respect to the member 10, and one end of the wire 9 is wound around the pulley portion 24 of the bracket 4. The arm 3 is fixed by being hooked to the mooring groove 26 of the bracket 4 so that a moment of rotating downward about the pivot axis (connection shaft 7) is always applied to the arm 3 by the force of the spring 8. At the same time, the tension applying mechanism according to the present embodiment includes the connecting member 21 including the axial movement means 15, the support member 10, the tension spring 8 and the wire 9 connected to the arm 3, and one end of the tension spring 8. Is fixed to the bracket 4 after the end of the wire 9 is wound around the pulley portion 24 of the bracket 4 that rotatably supports the base end of the arm 3. It is unitized. As a result, at the awning construction site, setting of the arm 3 and the tension applying mechanism is completed at the same time by simply fixing the bracket 4 portion integrated with the arm 3 to the housing wall surface 5, but the construction work is not necessarily performed. Even if it is not unitized, it can be assembled by directly fixing one end of the wire 9 to the housing wall surface 5 in field work.

  The screw mechanism serving as the axial direction moving means 15 includes an adjusting bolt 16 whose neck is hooked on the support member 10 to prevent axial movement, and a nut 17 which hooks the connecting member 21 and interlocks in the axial direction. The support member 10 and the connecting member 21 are connected so that the connecting member 21 is hooked to the nut 17 screwed into the adjusting bolt 16, and the nut 17 and the connecting member 21 are connected by the rotation of the adjusting bolt 16. It is provided to move in the longitudinal direction of the arm 3. In the present embodiment, the arm 3 is configured by a pipe having a rectangular cross section as shown in FIG. Therefore, the nut 17 screwed into the adjusting bolt 16 and the connecting member 21 surrounding the nut 17 are at least one place between the nut 17 and the connecting member 21 and between the connecting member 21 and the arm 3. Thus, the coupling member 21 and the nut 17 are provided so as to be unrotatable by making the gap sufficient to restrict rotation or by eliminating the gap.

  The support member 10 fixed to the arm 3 is configured as a lid having a contoured rectangular tube portion 11 that fits into the opening at the tip of the arm 3 and a flange portion 12 that contacts the opening end of the arm 3. A circular recess 13 in which the head 18 of the bolt 16 is rotatably accommodated and a rectangular recess 14 in which the stopper plate 19 is non-rotatably accommodated are formed on the front side. A stopper plate 19 that prevents the adjustment bolt 16 from rotating is disposed in parallel with one side of the hexagonal head 18 on the head 18 of the adjustment bolt 16. The bolt 16 is prevented from freely rotating by the contact of the plate 19 with one side of the hexagonal head 18. On the other hand, the rotation of the bolt 16 can be allowed by removing the stopper plate 19.

  In the case of the present embodiment, the connecting member 21 is made of a U-shaped plate member that penetrates the adjusting bolt 16 and is anchored to the nut 17 screwed into the bolt 16. The tension spring 8 is attached to the connecting member 21 by winding an end portion around a connecting pin 22 that connects both ends of the U-shaped connecting member 21. Here, it goes without saying that the connecting member 21 is not particularly limited to the illustrated configuration as long as the connecting member 21 can be moved in the longitudinal direction of the arm 3 by a screw mechanism that is anchored to the tension spring 8 and is the axial moving means 15. Yes.

  The bracket 4 is used to hook a center hole 23 through which the connecting shaft 7 serving as the pivot of the arm 3 passes, a circular pulley portion 24 concentric with the center hole 23, and a ball 28 at the end of the wire 9. The mooring groove 26 and an opening 27 for introducing the ball 28 at the end of the wire from the side and passing through the mooring groove 26 at the back are provided. The ball 28 at the end of the wire is introduced into the bracket 4 from the opening 27 on the side of the bracket 4 along the pulley portion 24, and is temporarily removed from the bottom surface of the bracket 4. And is fixed so as to be inserted into the mooring groove 26 at the back. In the bracket 4 in a state in which the bracket 4 is fixed to the housing wall surface 5, the mooring groove 26 is positioned above the center hole 23, the opening 27 faces downward, and the ball 28 at the end of the wire 9 extends from below. It is provided to be introduced to the top. That is, the wire 9 is provided so as to make a U-turn along the pulley portion 24 in the canvas winding state. Accordingly, the wire 9 wound around the bracket 4 is fixed to the bracket 4 so as to be wound around the pulley portion 24, so that the angle of the arm 3 changes, so that the wire 9 The angle wound around the pulley portion 24 changes, and the substantial wire length (the length until the wire is wound around the pulley portion 24) changes, whereby the tension of the tension spring 8 connected thereto changes. That is, the maximum tension, that is, the force that urges the arm 3 downward, is large when the arm 3 stands up substantially vertically (closed state with an opening angle of 0 °) by completely winding the canvas 1, As the opening angle of the arm 3 increases, the substantial length of the wire 9 increases and the tension of the tension spring 8 decreases, so that the tension applied to the arm 3 gradually decreases. As a result, the initial operation of the awning device from the closed state to the open state can be performed smoothly because the urging force of the urging mechanism is maximized.

  On the other hand, at the base end of the arm 3, a bearing tube portion 29 that is rotatably connected to the bracket 4 and supports the base end portion of the arm 3 is fitted and fixed by screws or the like. The bearing tube portion 29 has a bifurcated arm portion 30 that clamps the bracket 4 from both sides, and the connecting shaft 7 is passed through the center hole 23 and fixed with the bracket 4 inserted between the arm portions 30. Thus, the bracket 4 and the arm 3 are rotatably connected.

  In the present embodiment, the rotary drive device of the winding device 6 is exemplified by a manual type that combines a worm and a worm wheel and cannot be reversed. However, a system driven by an electric motor may be used.

  5 and 6 show another embodiment of the tension applying mechanism of the awning device of the present invention. In the tension applying mechanism of this embodiment, the tension applying mechanism including the bracket 4 is unitized in advance and can be attached to the arm 3. That is, the tension applying mechanism according to the present embodiment is configured such that the support member 34 (10) is fixed to the distal end of the support cylinder 31 protruding from the base end bracket 4 of the arm 3, as shown in FIG. It is fixed at a position spaced a certain distance from. The support member 34 is a so-called end plate, and is fixed to the opening on the front end side of the support tube 31 by welding or the like. The support cylinder 31 is brought into contact with the bottom surface of the bearing cylinder part 29 so as to be fitted in the internal space of the bearing cylinder part 29 rotatably connected to the bracket 4, and the ball 28 at one end of the wire 9 is attached to the bracket. When the tension spring 8 is tensioned by pulling out the screw rod 32 serving also as the axial movement means 15 and the connecting member by the rotation of the nut 33 after being engaged with the mooring groove 26 of the bearing 4, the bearing tube 29 And so as to be integrated. Therefore, the bracket 4, the bearing tube portion 29, and the support tube 31 are integrated into a unit, and the arm 3 is attached from the surroundings to complete the assembly of the tension applying mechanism to the arm 3. The arm 3 and the bearing tube portion 29 are fixed with a fastener such as a screw. A support portion 35 that supports a front frame (not shown) is fixed to the tip of the arm 3 with screws. Therefore, when it is necessary to adjust the tension of the tension applying mechanism after the awning is assembled, the front frame is removed, the arm 3 is further removed, and the support cylinder 31 is exposed. In addition, the connection member 32 in this embodiment consists of a screw rod that is attached by hooking one end of the tension spring 8, and is connected to the support member 34 by hooking a nut 33 to be screwed onto the support member 34. At the same time, the screw rod 32 and the nut 33 constitute a feed screw mechanism, that is, the axial movement means 15.

  In the case of the tension applying mechanism of the present embodiment, since one end of the spring 8 is not directly attached to the arm 3, it can be incorporated into the arm 3 of various sizes in a unitized state. Of course, the arm 3 to be assembled is assembled after being adjusted to have the required tension.

  According to the tension applying mechanism configured as described above, at the time of assembly to the arm 3, the adjusting bolt 16 (or the nut 33) as the axial movement means 15 is loosened so that the tension applied to the tension coil spring 8 becomes zero. After that, one end (the ball 28) of the wire 9 is hooked in the mooring groove 28 of the bracket 4. Thereafter, the adjustment bolt 16 (or nut 33) is rotated to pull the connecting member 21 (or screw rod 32), and a desired tension is applied to the connected tension coil spring 8 and wire 9. At this time, the application of tension to the tension coil spring 8 and the wire 9 only rotates the adjusting bolt 16 (or the nut 33), and thus no special equipment is required. Further, since no strong tension is applied, even if the wire 9 is missed, the worker is not injured.

  Then, after the desired tension is applied, in the case of the embodiment of FIG. 3, if the stopper plate 19 is disposed along the head 18 of the adjustment bolt 16 and fixed to the support member 10 with the screw 20, The head 18 of the adjusting bolt 16 cannot be rotated. Therefore, unless the stopper bolt 19 is removed and the adjustment bolt 16 is intentionally rotated, the adjustment bolt 16 does not rotate due to vibration or the like, and the tension spring 8 does not loosen. Furthermore, when the tension of the tension spring 8 needs to be adjusted, a desired tension can be obtained simply by removing the stopper plate 19 and rotating the adjusting bolt 16. In the case of the embodiment of FIG. 6, the ball 28 at one end of the wire 9 is assembled in the mooring groove 26 of the bracket 4, and then a desired tension is applied by turning the nut 33 and pulling the bolt / connection member 32. . Then, after applying a desired tension, the arm 3 is fitted into the bearing tube portion 29 and then fixed to the bearing tube portion 29 with screws. Therefore, when it is necessary to adjust the tension of the tension spring 8, the arm 3 is detached from the bearing tube portion 29 and the support tube 31 and the nut 33 are exposed, which is performed.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the present embodiment, the connecting members 21 and 32 are provided so as to be movable in the longitudinal direction of the arm 3 via a screw mechanism with respect to the support members 10 and 34, but are not particularly limited thereto. Any mechanism can be used as long as it is a mechanism / apparatus that allows relative linear movement between the two members in the longitudinal direction of the arm. Although not particularly illustrated, an axial movement means such as a dial type movement means, a ratchet type axial movement means, a sliding type axial movement means, or an axial movement means such as a wire pulling from the outside may be used.

  In the present embodiment, one end of the wire 9 is fixed to the bracket 4 by hooking the ball 28 so as to be fitted into the mooring groove 26 provided in the bracket 4, but this is particularly limited to this. Instead, as in the invention described in Patent Document 1, it may be wound around the pulley portion 24 of the bracket 4 to change the direction and then directly fixed to the building / body wall surface 5.

DESCRIPTION OF SYMBOLS 1 Canvas 2 Front frame 3 Arm 4 Bracket 5 Housing wall surface 6 Winding device 7 Bracket connecting shaft 8 Pull spring 9 Wire 10 Support member 15 Axial moving means (screw mechanism)
16 Adjustment bolts constituting the axial movement means 17 Nuts constituting the axial movement means 21 Connecting member 24 Pulley portion of the bracket 26 Mooring groove 27 Opening portion 28 Ball (one end of the wire 9)
29 Bearing tube portion 31 Support tube (constitutes a part of the support member)
32 Screw rods constituting the connecting member and the axial direction moving means 33 Nuts constituting the connecting member and the axial direction moving means 34 Support members (end plates)

Claims (5)

The base end of the arm that supports both ends of the front frame that supports the leading edge of the canvas is pivotally attached to the housing wall surface via the bracket, and by changing the inclination of the arm around the connecting shaft of the bracket, In the awning device that projects the canvas from the winding device installed on the daylighting opening while projecting it to the front of the daylighting opening, the arm is connected with a tension spring and a wire. On the other hand, a support member fixed to the arm, and a connecting member provided to the support member so as to be movable in the longitudinal direction of the arm through an axial movement means, the connection member having one end of the spring And fixing one end of the wire around the pulley portion of the bracket and then fixing the bracket or the wall of the housing to the shaft. By operating the direction moving means to move the connecting member in the longitudinal direction of the arm, the tension of the spring can be adjusted, and the force of the spring always causes the arm to rotate downward about its pivot axis. A tensioning mechanism of an awning device comprising a tensioning mechanism having a structure in which tension is applied to the canvas. The supporting member is fitted and fixed to the opening at the tip of the arm, and an operating portion of the axial direction moving means for supporting the connecting member movably in the longitudinal direction of the arm with respect to the supporting member is the arm. 2. The awning device according to claim 1, wherein the awning device is exposed outside and is capable of adjusting the tension of the tension spring by moving the connecting member within the arm by operating an operation portion exposed at a tip of the arm. Tensioning mechanism. The arm with the support member fixed to the tip, the bracket for rotatably supporting the base end side of the arm, and the axial movement means operable from the outside of the arm. The connecting member connected to the support member so as to be movable in the longitudinal direction of the arm, and a member connecting the tension spring and the wire is built in the arm, and one end of the tension spring is provided. 2. The tension of the awning device according to claim 1, wherein the awning device is unitized by being fixed to the connecting member and being wound around a pulley portion of the bracket and then being fixed to the bracket. Grant mechanism. The support member is rotatably connected to the bracket at the base end of the arm, and is fixed to the tip of a support tube that abuts a bearing tube that supports the base end of the arm. Incorporates the connection between the tension spring and the wire inside, while engaging one end of the wire with the anchoring groove of the bracket and moving the connecting member relative to the support member in the longitudinal direction of the arm When the tension spring is loaded with tension by adjusting the axial movement means, the bearing cylinder portion and the support cylinder are integrated to form a unit. The tension applying mechanism of the awning device according to claim 1, wherein the tension applying mechanism is used. The tension applying mechanism for an awning device according to any one of claims 1 to 4, wherein the axial movement means is a feed screw mechanism, and the connection member is moved in the longitudinal direction of the arm by rotation of a screw. .

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