JP2017145666A - Brake mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake mechanism having a simple constitution requiring no electrical wiring.SOLUTION: A brake mechanism comprises: a rotary member, which rotates around a rotation axis; a butting surface, which restricts the rotation of the rotary member by butting against the rotary member; a fixing member, which is formed on the butting surface side and extends along the rotation direction of the rotary member and has a groove that changes in depth depending on a position in the rotation direction; and a rolling member, which rolls along the groove. When the rolling member moves to a first position, the rotary member separates away from the fixing member, and when the rolling member moves to a second position, the rotary member butts against the fixing member.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a brake mechanism.

  Conventionally, there has been known a brake mechanism that prevents the rotating member from rotating freely when the rotating member that rotates about the shaft stops, and that does not inhibit the rotation when the rotating member rotates. (For example, refer to Patent Document 1).

JP-A-9-137682

  However, the conventional brake mechanism includes a solenoid. As a result, it is necessary to connect electrical wiring to the solenoid of the brake mechanism, which causes a problem that the entire apparatus including the brake mechanism becomes complicated.

  The present invention has been made in view of the above, and an object thereof is to provide a brake mechanism having a simple configuration that does not require electrical wiring.

  In order to solve the above-described problems and achieve the object, a brake mechanism according to an aspect of the present invention includes a rotating member that rotates about a rotating shaft, and a rotation member that contacts the rotating member and restricts rotation of the rotating member. The fixing member formed on the contact surface and the corresponding contact surface side, extending along the rotation direction of the rotating member, and having a groove whose depth varies depending on the position in the rotating direction; A rolling member that rolls along the groove, and when the rolling member is moved to the first position, the rotating member and the fixed member are separated from each other, and the rolling member is moved to the second position. Further, the rotating member and the fixed member are in contact with each other.

  In the brake mechanism according to one aspect of the present invention, the first position is a position where the depth of the groove is the shallowest, and the second position is a position where the depth of the groove is the deepest. It is characterized by being.

  In addition, the brake mechanism according to one aspect of the present invention includes an urging unit that urges either the fixed member or the rotating member in a direction approaching the other.

  Moreover, the brake mechanism according to one aspect of the present invention is characterized in that the depth of the groove changes so as to become shallower from the center toward both ends.

  The brake mechanism according to an aspect of the present invention is characterized in that the fixing member includes a plurality of the grooves, and one rolling member is disposed in each of the grooves.

  The brake mechanism according to one aspect of the present invention is characterized in that a guide groove that guides movement of the rolling member along the groove is formed at a position facing the groove of the rotating member. To do.

  Further, the brake mechanism according to one aspect of the present invention is characterized in that a friction body is provided on either the surface that contacts the contact surface of the rotating member or the contact surface. .

  The brake mechanism according to one aspect of the present invention is characterized in that the friction body is made of an elastic member.

  In the brake mechanism according to one aspect of the present invention, the rolling member is a sphere.

  According to the present invention, a brake mechanism having a simple configuration that does not require electrical wiring can be realized.

FIG. 1 is a schematic diagram showing the overall configuration of a shutter device including a brake mechanism according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view of the roll of FIG. FIG. 3 is a schematic diagram showing an internal configuration of the opening / closing device of the shutter device shown in FIG. FIG. 4 is a view in which the brake mechanism is removed from FIG. 3. FIG. 5 is a view of FIG. 3 viewed from the opposite side. FIG. 6 is an enlarged cross-sectional view of the roll and the gear. FIG. 7 is an exploded view of the brake mechanism. FIG. 8 is a top view of the fixing member. FIG. 9 is a cross-sectional view of the brake mechanism corresponding to the line AA in FIG. FIG. 10 is a diagram for explaining the operation of the brake mechanism. FIG. 11 is a diagram for explaining the operation of the brake mechanism. FIG. 12 is a cross-sectional view of a brake mechanism according to a modification of the embodiment.

  Embodiments of a brake mechanism according to the present invention will be described below with reference to the drawings. Note that the present invention is not limited to these embodiments. In the following embodiments, a brake mechanism used in a shutter device will be described as an example, but the present invention can be applied to a brake mechanism in general that restricts rotational movement. Therefore, the present invention can be applied to a brake mechanism such as a screen.

  In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals as appropriate. It should be noted that the drawings are schematic, and the relationship between the dimensions of each element, the ratio of each element, and the like may differ from the actual situation. Even between the drawings, there are cases in which portions having different dimensional relationships and ratios are included.

(Embodiment)
FIG. 1 is a schematic diagram showing the overall configuration of a shutter device including a brake mechanism according to an embodiment of the present invention. As shown in FIG. 1, a shutter device 1 according to the present embodiment includes a shutter 2, a roll 3 having one end of the shutter 2 fixed, and rotating the shutter 2 by rotating integrally with the shutter 2, and a roll And an opening / closing device 4 that rotates 3.

  The shutter 2 opens and closes following the rotation of the roll 3 by fixing one end to the roll 3.

  FIG. 2 is an enlarged perspective view of the roll of FIG. As shown in FIG. 2, the roll 3 includes a shaft 3 a serving as a rotation axis, and a wheel 3 b that is fixed at one end of the shutter 2 and rotates around the shaft 3 a. The shaft 3a is fixed to a wall surface or the like to which the shutter device 1 is attached and does not rotate. On the other hand, the wheel 3b rotates when the opening / closing device 4 operates.

  FIG. 3 is a schematic diagram showing an internal configuration of the opening / closing device of the shutter device shown in FIG. That is, FIG. 3 is a diagram showing a state in which the housing 4a of the opening / closing device 4 shown in FIG. 1 is removed. Note that illustrations and descriptions of the screws and the like for fixing each internal configuration of the switching device 4 shown in FIG. 3 and the housing 4a are omitted as appropriate.

  As shown in FIG. 3, the opening / closing device 4 includes a motor 101 and a motor 102 that can rotate forward and reverse, a gear 103 and a gear 104 that are fixed to the rotation shafts of the motor 101 and the motor 102, a shaft 105, and a gear 103, respectively. A gear 106 that rotates forward and backward around the gear 104 and the meshing shaft 105, a brake mechanism 107 connected to the gear 106, a shaft 108, and a gear 109 that rotates forward and backward around the gear 106 and the meshing shaft 108; A shaft 110, a gear 111 that meshes with the gear 109, and a gear 111 that rotates forward and backward around the shaft 110, and a gear 112 that meshes with the gear 111 and rotates normally and reversely are provided. In the following description, the direction in which the shutter 2 is opened will be referred to as the forward direction, and the direction in which the shutter 2 is closed will be described as the reverse direction. Each arrow shown in FIG. 3 etc. has shown the direction of forward rotation of each gear.

  The motor 101 and the motor 102 rotate forward and backward by being supplied with electric power from a power supply unit (not shown). When the shutter 2 is opened, the motor 101 and the motor 102 rotate the rotation shaft in the counterclockwise direction of FIG. 3 as indicated by an arrow in FIG. On the other hand, the motor 101 and the motor 102 rotate the rotating shaft in the clockwise direction of FIG. 3 when closing the shutter 2. The number of motors may be one depending on the weight of the shutter 2 or the like, or may be three or more.

  The gear 103 and the gear 104 are fixed to the rotation shafts of the motor 101 and the motor 102 and rotate integrally with the rotation shafts of the motor 101 and the motor 102. The gear 103 and the gear 104 are arranged on both sides so as to sandwich the gear 106.

  The shaft 105 is fixed to the housing 4a. A brake mechanism 107 is connected to the gear 106, and the rotation of the gear 106 is restricted by the brake mechanism 107. FIG. 4 is a view in which the brake mechanism is removed from FIG. 3. As shown in FIG. 4, the gear 106 has teeth 106a formed on the outer periphery, and teeth 106b formed so as to protrude in the direction in which the shaft 105 extends inside the teeth 106a. The teeth 106 a mesh with the gear 103 and the gear 104, and the power from the motor 101 and motor 102 side is transmitted to the gear 106. A detailed description of the brake mechanism 107 will be described later.

  The shaft 108 is fixed to the housing 4a. The gear 109 has teeth 109a formed on the outer periphery and teeth 109b formed so as to protrude in the direction in which the shaft 108 extends inside the teeth 109a. The teeth 109 a mesh with the teeth 106 b of the gear 106, and the power from the motor 101 and motor 102 side is transmitted to the gear 109.

  The shaft 110 is fixed to the housing 4a. FIG. 5 is a view of FIG. 3 viewed from the opposite side. As shown in FIG. 5, the gear 111 has teeth 111a formed on the outer periphery and teeth 111b formed so as to protrude in the direction in which the shaft 110 extends inside the teeth 111a. The teeth 111 a mesh with the teeth 109 b of the gear 109, and the power from the motor 101 and motor 102 side is transmitted to the gear 111.

  The gear 112 has teeth 112a formed on the outer periphery. The teeth 112a mesh with the teeth 111b of the gear 111, and the power from the motor 101 and motor 102 side is transmitted to the gear 112. FIG. 6 is an enlarged cross-sectional view of the roll and the gear. The cross section of FIG. 6 is a surface including the centers of the roll 3 and the gear 112. As shown in FIG. 6, the gear 112 has an arm 112b extending in a direction orthogonal to the rotation direction. The arm 112 b is fixed to the wheel 3 b of the roll 3. Therefore, the gear 112 and the wheel 3b rotate integrally. Therefore, when the motor 101 and the motor 102 rotate, power is transmitted by each gear, and the wheel 3b of the roll 3 rotates. As a result, the shutter 2 opens when the motor 101 and the motor 102 rotate forward, and closes when the motor 101 and the motor 102 rotate backward.

  Next, the configuration of the brake mechanism 107 will be described in detail. FIG. 7 is an exploded view of the brake mechanism. As shown in FIG. 7, the brake mechanism 107 is fixed so as not to rotate with respect to the rotating member 11 that rotates about a shaft 105 (see FIG. 3) that is a rotating shaft and the housing 4 a (see FIG. 1). A fixing member 12, a ball 13 as a rolling member, and a spring 14 (see FIG. 3) as an urging means.

  A shaft hole 11 a through which the shaft 105 is inserted and a guide groove 11 b that guides the movement of the ball 13 are formed in the rotating member 11. The rotating member 11 is fixed to the gear 106 and rotates around the shaft 105 integrally with the gear 106.

  The fixed member 12 is formed on the side of the contact surface 12b, the shaft hole 12a through which the shaft 105 is inserted, the contact surface 12b that contacts the rotation member 11 and restricts the rotation of the rotation member 11, and rotates. Grooves 12c extending along the rotation direction of the member 11 are formed.

  The shaft 105 is inserted into the shaft hole 12a, and the fixing member 12 is fixed by a fixing means (not shown) so as not to rotate with respect to the shaft 105. As a fixing means, the fixing member 12 and the shaft 105 are fixed to each other using a fixing pin. Alternatively, as a fixing means, the shaft 105 and the shaft hole 12a have a D-cut shape that can be fitted to each other, and are fitted so as not to rotate relative to each other. The fixing member 12 is assembled so as to be movable in the direction along the shaft 105, although the fixing member 12 does not rotate around the shaft 105 by the fixing means.

  FIG. 8 is a top view of the fixing member. A brake pad 12ba as a friction body is provided on the contact surface 12b. The brake pad 12ba is provided over the entire circumference along the outer side of the groove 12c (the side opposite to the shaft 105). The brake pad 12ba increases the frictional force between the rotating member 11 and the contact surface 12b of the fixed member 12, and increases the braking force by the brake mechanism 107. The brake pad 12ba is preferably made of an elastic member. When the brake pad 12ba has elasticity and the urging force of the spring 14 is applied to the fixing member 12, when the ball 13 is positioned at the deepest portion 12ca of the groove 12c, the ball 13 has both the groove 12c and the guide groove 11b. And contact securely. As a result, the ball 13 is prevented from idling away from the groove 12c or the guide groove 11b.

  However, the friction body may be provided on a surface that contacts the contact surface 12 b of the rotating member 11. The friction body may be provided on the surface 12d protruding in the direction in which the shaft 105 extends. In this case, the surface 12d as the contact surface and the gear 106 come into contact with each other, and the opening and closing of the shutter 2 is restricted. At this time, the rotating member 11 and the contact surface 12b do not contact each other. As described above, the present embodiment also includes a configuration in which the surface 12d as the contact surface does not directly contact the rotating member 11, but indirectly contacts the rotating member 11 via the gear 106 or the like.

  As shown in FIG. 8, three grooves 12 c are formed along the rotation direction of the rotating member 11. FIG. 9 is a cross-sectional view of the brake mechanism corresponding to the line AA in FIG. As shown in FIG. 9, the depth of the groove 12 c varies depending on the position of the rotating member 11 in the rotation direction. Specifically, the depth of the groove 12c changes from the deepest part 12ca as the first position located at the substantially central part so as to become shallower toward both ends, and the second position is provided at both ends as the second position. The shallowest part 12cb and the shallowest part 12cc are located. The distance from the bottom surface of the deepest portion 12ca of the groove 12c to the bottom surface of the guide groove 11b is substantially equal to the diameter of the ball 13. The distance from the bottom surface of the shallowest portion 12 cb or the shallowest portion 12 cc of the groove 12 c to the bottom surface of the guide groove 11 b is smaller than the diameter of the ball 13.

  The ball 13 is a sphere made of metal, for example. The balls 13 are arranged one by one in the grooves 12c of the fixing member 12, are guided by the guide grooves 11b, and roll and move along the grooves 12c.

  The spring 14 is disposed between the surface of the fixing member 12 opposite to the surface on which the contact surface 12 b is formed and the inner wall surface of the housing 4 a, and brings the fixing member 12 closer to the rotating member 11. Energize to.

  Next, the operation of the brake mechanism 107 will be described. First, a state where the brake mechanism 107 restricts opening and closing of the shutter 2 will be described. First, when the motor 101 and the motor 102 are not rotating, the ball 13 is positioned at the deepest portion 12ca of the groove 12c. Here, the distance from the bottom surface of the deepest portion 12 ca of the groove 12 c to the bottom surface of the guide groove 11 b is substantially equal to the diameter of the ball 13. As a result, in this state, the rotating member 11 and the contact surface 12b of the fixed member 12 are in contact. Since the fixing member 12 is fixed so as not to rotate with respect to the shaft 105, the rotation of the rotating member 11 with respect to the shaft 105 is caused by the frictional force between the rotating member 11 and the contact surface 12 b of the fixing member 12. It is regulated. At this time, since the rotation of the gear 106 fixed to the rotating member 11 is also restricted, the rotation of each gear meshing with the gear 106 is also restricted, and as a result, the opening and closing of the shutter 2 is restricted.

  Next, how the restriction of opening / closing of the shutter 2 by the brake mechanism 107 is released will be described. 10 and 11 are diagrams for explaining the operation of the brake mechanism. When the motor 101 and the motor 102 rotate in the forward direction, the rotating member 11 rotates in the direction of the arrow C1 shown in FIG. Then, the ball 13 sandwiched between the guide groove 11b of the rotating member 11 and the groove 12c of the fixing member 12 rolls from the deepest portion 12ca to the shallowest portion 12cb along the arrow C2 shown in FIG. Move while. Here, when the ball 13 starts to move from the deepest portion 12ca of the groove 12c, the fixing member 12 moves away from the rotating member 11 against the urging force of the spring 14 by being pushed by the ball 13 (shown in FIG. 10). Move in the direction of arrow C3). Then, the rotating member 11 and the contact surface 12b of the fixed member 12 start to separate. Further, the distance from the bottom surface of the shallowest portion 12 cb of the groove 12 c to the bottom surface of the guide groove 11 b is smaller than the diameter of the ball 13. As a result, when the ball 13 moves to the shallowest portion 12cb, the rotating member 11 and the contact surface 12b of the fixing member 12 are reliably separated from each other, and the restriction on the rotation of the rotating member 11 is reliably released. Further, while the motor 101 and the motor 102 are rotating in the forward direction, the ball 13 is idled at the shallowest portion 12cb of the groove 12c, so that the state where the restriction on the rotation of the rotating member 11 is released is maintained. . At this time, since the gear 106 fixed to the rotating member 11 is rotating in the forward direction, the power from the motor 101 and the motor 102 is transmitted to the roll 3 and the shutter 2 is opened.

  Similarly, when the motor 101 and the motor 102 rotate in the reverse direction, the rotating member 11 rotates in the direction of the arrow C4 shown in FIG. Then, the ball 13 sandwiched between the guide groove 11b of the rotating member 11 and the groove 12c of the fixing member 12 rolls from the deepest part 12ca of the groove 12c to the shallowest part 12cc along the arrow C5 shown in FIG. Move while. Here, when the ball 13 starts to move from the deepest portion 12ca of the groove 12c, the fixing member 12 moves away from the rotating member 11 against the biasing force of the spring 14 by being pushed by the ball 13 (shown in FIG. 11). Move in the direction of arrow C6). Then, the rotating member 11 and the contact surface 12b of the fixed member 12 start to separate. Further, the distance from the bottom surface of the shallowest portion 12 cc of the groove 12 c to the bottom surface of the guide groove 11 b is smaller than the diameter of the ball 13. As a result, when the ball 13 moves to the shallowest portion 12cc, the rotating member 11 and the contact surface 12b of the fixing member 12 are reliably separated from each other, and the restriction on the rotation of the rotating member 11 is reliably released. Further, while the motor 101 and the motor 102 are rotating in the opposite directions, the ball 13 idles at the shallowest portion 12cc of the groove 12c, so that the state where the restriction on the rotation of the rotating member 11 is released is maintained. . At this time, since the gear 106 fixed to the rotating member 11 is rotating in the reverse direction, the power from the motor 101 and the motor 102 is transmitted to the roll 3 and the shutter 2 is closed.

  Next, how the opening and closing of the shutter 2 is regulated by the brake mechanism 107 will be described. In a state where the restriction on the opening and closing of the shutter 2 by the brake mechanism 107 is released, the motor 101 and the motor 102 are rotated by a predetermined number of rotations in a direction opposite to the rotation direction so far. Then, the rotating member 11 rotates in the opposite direction, and the ball 13 moves from the shallowest part 12cb or the shallowest part 12cc to the deepest part 12ca along the slope of the groove 12c. As a result, the rotating member 11 and the contact surface 12b of the fixed member 12 come into contact with each other, and the opening and closing of the shutter 2 is restricted. Note that the ball 13 may be moved to the deepest portion 12ca by the biasing force of the spring 14 when the motor 101 and the motor 102 are stopped regardless of the rotation of the motor 101 and the motor 102 in the reverse direction. In this case, when the motor 101 and the motor 102 are stopped, the rotating shafts of the motor 101 and the motor 102 can be freely rotated, and the urging force of the spring 14 reversely rotates the rotating member 11 via the ball 13, thereby 13 moves to the deepest part 12ca.

  As described above, in the brake mechanism 107, when the motor 101 and the motor 102 are not rotating, the rotation of the rotating member 11 is restricted. When the motor 101 and the motor 102 rotate forward and backward, the rotating member 11 The restriction on the rotation is released. Therefore, the brake mechanism 107 is a brake mechanism with a simple configuration that does not require electrical wiring. Further, since the brake mechanism 107 does not require electrical wiring, the manufacturing cost of the entire apparatus can be reduced. The brake mechanism 107 can operate and release the brake using the opening / closing operation of the shutter 2 by driving the motor 101 and the motor 102. Therefore, the brake mechanism 107 does not require a drive mechanism dedicated to the brake mechanism, and is a brake mechanism with a simple configuration.

  In the above-described embodiment, the configuration in which the spring 14 as the urging unit urges the fixing member 12 in the direction in which the fixing member 12 is brought closer to the rotating member 11 has been described. For example, a configuration in which the spring 14 as the biasing unit biases the rotating member 11 toward the fixing member 12 may be employed. Further, the rotating member 11 or the fixed member 12 may be biased by hydraulic pressure or the like as the biasing means. Moreover, the structure which does not have an urging | biasing means and the contact surface 12b of the rotating member 11 and the fixing member 12 contact | abuts by the dead weight of the rotating member 11 or the fixing member 12 may be sufficient. At this time, the rotating member 11 or the fixing member 12 may be weighted to adjust the frictional force between the rotating member 11 and the contact surface 12b of the fixing member 12.

  Further, it is preferable that the fixing member has three or more grooves, and a ball is disposed in each groove. With this configuration, the fixing member and the ball come into contact with each other at three or more points, and the operation is stabilized. Similarly, with this configuration, the rotating member and the ball come into contact at three or more points, and the operation is stabilized. However, as long as the mutual displacement between the fixed member and the rotating member is prevented, the number of grooves and balls may be one or two.

(Modification)
FIG. 12 is a cross-sectional view of a brake mechanism according to a modification of the embodiment. In the fixing member 12A of the brake mechanism 107A according to the modification of the embodiment, the depth of the groove 12Ac changes so as to become shallower from the deepest portion 12Aca located at one end toward the other end, and the shallowest at the other end. The part 12Acb is located. The distance from the bottom surface of the deepest part 12Aca of the groove 12Ac to the bottom surface of the guide groove 11b is substantially equal to the diameter of the ball 13. The distance from the bottom surface of the shallowest portion 12Acb of the groove 12Ac to the bottom surface of the guide groove 11b is smaller than the diameter of the ball 13.

  In the brake mechanism 107A, when the motor 101 and the motor 102 rotate in the forward direction, the rotating member 11 rotates in the direction of the arrow C7 shown in FIG. Then, the ball 13 sandwiched between the guide groove 11b of the rotating member 11 and the groove 12Ac of the fixing member 12 rolls from the deepest portion 12Aca of the groove 12Ac to the shallowest portion 12Acb along the arrow C8 shown in FIG. Move while. Here, when the ball 13 starts to move from the deepest portion 12Aca of the groove 12Ac, the fixing member 12A moves away from the rotating member 11 against the urging force of the spring 14 by being pushed by the ball 13 (shown in FIG. 12). Move in the direction of arrow C9). Then, the rotating member 11 and the contact surface 12b of the fixed member 12A start to separate. Further, the distance from the bottom surface of the shallowest portion 12Acb of the groove 12Ac to the bottom surface of the guide groove 11b is smaller than the diameter of the ball 13. As a result, when the ball 13 moves to the shallowest portion 12Acb, the rotating member 11 and the contact surface 12b of the fixing member 12A are surely separated from each other, and the restriction on the rotation of the rotating member 11 is reliably released.

  On the other hand, in the brake mechanism 107A, even if the motor 101 and the motor 102 rotate in the opposite directions, the rotating member 11 and the contact surface 12b of the fixing member 12A remain in contact with each other. Regulations are not released. Therefore, since this brake mechanism 107A has a function of preventing reverse rotation, it can also be applied as a reverse rotation prevention mechanism.

  As in the modification, the fixing member only needs to have a groove whose depth changes so that at least one end in the rotation direction of the rotating member is the shallowest.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

DESCRIPTION OF SYMBOLS 1 Shutter device 2 Shutter 3 Roll 3a, 105, 108, 110 Shaft 3b Wheel 4 Opening / closing device 4a Housing 11 Rotating member 11a, 12a Shaft hole 11b Guide groove 12, 12A Fixing member 12b Contact surface 12ba Brake pad 12c, 12Ac Groove 12ca 12Aca deepest part 12cb, 12cc, 12Acb shallowest part 12d face 13 ball 14 spring 101, 102 motor 103, 104, 106, 109, 111, 112 gear 106a, 106b, 109a, 109b, 111a, 111b, 112a tooth 107, 107A Brake mechanism 112b Arm

Claims (9)

A rotating member that rotates about a rotation axis;
A contact surface that contacts the rotating member and restricts the rotation of the rotating member, and is formed on the corresponding contacting surface side, extends along the rotating direction of the rotating member, and has a depth depending on the position in the rotating direction. A fixing member formed with a groove that changes,
A rolling member that rolls along the groove,
When the rolling member moves to the first position, the rotating member and the fixed member are separated from each other,
When the rolling member moves to the second position, the rotating member and the fixing member come into contact with each other. The first position is a position where the depth of the groove is the shallowest,
The brake mechanism according to claim 1, wherein the second position is a position where the depth of the groove is the deepest.   3. The brake mechanism according to claim 1, further comprising an urging unit that urges either the fixing member or the rotating member in a direction to approach the other. 4.   The brake mechanism according to any one of claims 1 to 3, wherein the depth of the groove changes so as to become shallower from the center toward both ends. The fixing member is formed with a plurality of the grooves,
The brake mechanism according to claim 1, wherein one rolling member is disposed in each groove.   The guide groove which guides the movement along the said groove | channel of the said rolling member is formed in the position facing the said groove | channel of the said rotation member, The any one of Claims 1-5 characterized by the above-mentioned. Brake mechanism.   The friction body is provided in any one of the surface contact | abutted with the said contact surface of the said rotation member, or the said contact surface, The Claim 1 characterized by the above-mentioned. Brake mechanism.   The brake mechanism according to claim 7, wherein the friction body is made of an elastic member.   The brake mechanism according to any one of claims 1 to 8, wherein the rolling member is a sphere.

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