JP2019031895A - Rotor brake device - Google Patents

Abstract

To provide a simple device which returns easily even once a rotor brake device actions a brake and are reusable many times while preventing an abrupt rotation of the rotation device.SOLUTION: A rotor brake device comprises a rotor 3 supported rotatably to a machine frame 2, an idler wheel 4 in a cylinder shape supported on an outer peripheral surface 3a of the rotor 3 and capable of performing an autorotation and movement in a transverse direction, a rolling element 6 in a cylinder shape or in a spherical shape supported on an inner peripheral surface 4b of the idler wheel 4 and capable of performing an autorotation and a revolution and a movement restriction body 7 fixed to the machine frame 2 at an outside position of the idler wheel 4. When rotation speed of the rotor 3 reaches a predetermined rotation speed, the idler wheel 4 moves upward and after abutting the movement restriction body 7 brake stops the rotor 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating body braking device that brakes rotation when a rotating body suddenly increases its rotational speed. This device is used as an emergency rotation braking device such as a winding shaft such as an electric or manual shutter curtain, and the winding shaft is driven by a malfunction of the electric motor that rotates the winding shaft or an abnormality in the drive control system. Used to prevent the shutter curtain from falling down by braking the sudden rotation of the rotating body connected to the take-up shaft to prevent the shutter curtain from dropping suddenly. It can be done.

  A rotating body that has been rotating at a slow rotation speed in a normal state from the past may suddenly increase in rotational speed for some reason. It is necessary to brake the sudden rotation at this time to prevent dangers such as damage to the rotating device and dropping of various connected devices. As a conventional example in which this rotating body braking device is used, there is a shutter curtain elevating safety device. As this elevating / lowering safety device, there are a governor device, a brake device and the like for lowering the shutter curtain at a slow speed when the rotation drive device is abnormal. However, in this governor device, when the rotary drive device is abnormal, for example, when the drive roller chain is broken or the brake of the electric motor is broken, the shutter curtain drops rapidly without stopping on the spot. When there is an obstacle in the lower part of the shutter curtain, there is a problem of colliding with the obstacle. In order to solve this problem, there has been proposed a shutter bearing provided with a fall prevention device using a braking device for a rotating part that suppresses the fall of the shutter curtain (see, for example, Japanese Patent Laid-Open No. 2000-110461).

  This fall prevention device (shutter bearing) has a disk part that is a rotating part and a body part that is a fixed part, and the outer periphery of the disk part is formed with a concave groove that can accommodate a hollow roller. The body part is formed with an inner peripheral part composed of a lower part approaching the envelope of the disk part and an upper part spaced approximately half of the outer diameter of the roller. Thus, the roller is not dropped into the deep part of the concave groove and the rotation is not hindered. In abnormal rotation, the roller is sandwiched between the shallow part of the groove and the terminal part of the upper part, the roller is deformed by the impact and absorbs the impact force, and the roller falls back into the deep part of the groove. Prevents the shutter curtain from falling.

  As another example of the shutter fall prevention device, a cam plate and a claw wheel, which are integrally mounted on a spindle of a winding drum of a shutter curtain, are supported so as to be swingable via the spindle, and the claw wheel is provided at one end. A claw tool having a claw tip that can be engaged with the roller and a roller are provided. Usually, the roller is in contact with the outer periphery of the cam plate. However, when the take-up drum suddenly reaches a high rotational speed, the claw tool swings so that the roller moves away from the outer periphery of the cam plate, and the toe engages with the claw wheel. There has been proposed a fall prevention device that stops rotation and prevents a sudden fall of the shutter curtain (see, for example, JP-A-2006-241807). In this fall prevention device, the constituent mechanical elements are composed of cams, rollers, springs, claw wheels, etc., and have a complicated mechanical structure.

JP 2000-110461 A JP 2006-241807 A

  The shutter curtain drop prevention device (rotating body braking device) has a troublesome problem that once the operation is activated, the roller is deformed and cannot be reused, and the roller needs to be replaced. In addition, the mechanical elements that make up the rotating body braking device use mechanical elements such as cams and springs, which increases the number of parts that make up the device, increases costs, and increases the size of the device itself. It was difficult to incorporate the device into

  The present invention has been made in consideration of the above-mentioned problems, and can reliably brake rotation when the number of rotations of the rotating body suddenly increases, and even when the rotating body braking device is activated, the constituent elements, for example, An object of the present invention is to provide a rotating body braking device that can be reused many times without deformation of rolling elements and the like, and does not require replacement work of a machine element each time. It is another object of the present invention to provide a braking device that can easily return to a normal state by canceling the braking state after the rotating body braking device performs a braking operation. Further, the conventionally proposed rotating body braking device is composed of mechanical elements such as gears, cams, and springs, and the structural elements are relatively complicated, resulting in high manufacturing costs and repair costs. An object of the present invention is to provide a rotating body braking device in which machine elements constituting the device are simplified.

  Of the present inventions, the invention according to claim 1 is a machine frame, a rotating body that is rotatably supported by the machine frame, and a rotary body that is rotated and supported by the outer peripheral surface of the rotating body. A cylindrical idler wheel, and a cylindrical shape capable of rotating and revolving, which is located in a gap formed by the inner peripheral surface of the idler wheel and the outer peripheral surface of the rotating body, and is held on the inner peripheral surface of the idler wheel Or a spherical rolling element and a movement restricting body fixed to the machine frame at a position outside the outer diameter of the idler wheel, and when the rotating body has a predetermined number of rotations or less, the rolling element The intermediate wheel is held on the inner peripheral surface without contacting the outer peripheral surface of the rotating body at an intermediate position or a position in the vicinity thereof, and when the rotating body exceeds a predetermined rotational speed, the idler wheel moves laterally and moves. The lateral movement is restricted by contacting the regulating body, and the rolling element moves on the inner peripheral surface. A rotating body braking device for braking the rotating body by biting into the inlet of the gap became wedge-shaped narrowing.

  In the invention according to claim 2, the separation distance S between the outer peripheral surface of the idler wheel and the movement restricting body is such that the outer diameter of the rolling element is A, the inner diameter of the idler wheel is B, and the outer diameter of the rotating body is Assuming C, the rotating body braking device is set to satisfy the relationship of S <A <(BC).

  The invention according to claim 3 is the rotating body braking device in which the idler wheel is made of spring steel, and can be elastically returned to the idler wheel having a predetermined dimension after extending into a flat plate shape.

  The present invention according to claim 4 includes a semicircular idler ring divided into two, and convex and concave portions that are engaged with each other are formed at both ends of the semicircular idler ring. This is a rotating body braking device in which the outer diameter of a circular idle wheel combined with a ring is fastened with a fastening body made of spring steel.

  The invention according to claim 5 is the rotating body braking device in which the movement restricting body comprises an outer box, and the outer box includes the idler wheel, the rotating body, and the rolling element.

  In the invention according to claim 6, the outer shape of the outer box body is provided with an open groove having a width larger than the outer diameter of the rotating shaft from the outer side of the outer box body to the center position, or the entire outer shape of the outer box body It is a rotating body braking device constituted by dividing into at least two.

  The invention according to claim 7 is a rotating body braking device in which the movement restricting body includes a locking bolt capable of changing a separation distance S from the outer peripheral surface of the idler wheel.

  The invention according to claim 8 is the rotating body braking apparatus in which the rotating body is driven to rotate by being connected to a take-up shaft that winds and lowers a shutter curtain provided at the upper part of the opening of the building.

  The invention according to claim 9 is a rotating body braking apparatus using the winding shaft itself as a rotating body instead of the rotating body.

  According to the first aspect of the present invention, the main mechanical elements other than the rotating body constituting the apparatus are simply constituted by idle wheels, rolling elements and movement restricting bodies, and manufacturing and adjustment costs may be small. . The apparatus of the present invention is compact because it is composed of simple mechanical elements, and can be easily incorporated into an existing apparatus later. Further, the return operation after the braking operation has an effect that the braking operation can be canceled simply by rotating the rotating body in the reverse direction.

  According to the second aspect of the present invention, the outer diameter of the rolling element is made smaller than the gap width (BC) formed by the difference between the inner diameter of the idler wheel and the outer diameter of the rotating body. The rolling element can be held at an intermediate position, which will be described later, of the inner diameter of the idler wheel or a position in the vicinity thereof. In addition, when the rotation speed is increased by making the separation distance S between the outer peripheral surface of the idler wheel and the movement restricting body smaller than the outer diameter of the rolling element when the rotation is stopped, the outer diameter of the rotating object and the idler wheel A tapered wedge-shaped gap having an inner diameter is formed, and the rolling element has an effect of biting into the inlet and abruptly stopping the rotating body and the idler wheel.

  According to the third aspect of the present invention, the idler wheel is made of spring steel, and can be elastically returned to the idler wheel having a predetermined size and shape after being stretched to be assembled to the rotating body. There is an effect that the idler wheel can be assembled to the shutter device without disassembling the others.

  According to the fourth aspect of the present invention, the idler wheel is composed of a semicircular idler ring divided into two, and convex and concave portions that are engaged with each other are formed at both ends of the semicircular idler wheel and combined. By tightening the outer diameter of the circular idler ring with a fastening body made of spring steel, there is an effect that the idler wheel can be easily assembled without disassembling the rotating shaft and the like of the existing shutter device as described above. .

  According to the fifth aspect of the present invention, the movement restricting body is configured as an exterior box that can hold the rotating body, the idler wheel, and the rolling element therein, so that the rotating body braking device can be configured such as moisture or dust from outside air. It can be prevented from dirt, and reliable and stable braking operation can be guaranteed.

  According to the present invention of claim 6, the outer shape of the outer box is provided with an open groove having a width larger than the outer diameter of the rotating shaft from the outer side of the outer box to the center position, or at least the entire outer shape of the outer box By being divided into two parts, there is an effect that the exterior box can be easily assembled without disassembling the rotating shaft of the existing shutter device.

  According to the seventh aspect of the present invention, by setting the locking bolt capable of easily changing the separation distance S between the outer peripheral surface of the idler wheel and the movement restricting body, the rotational speed at which braking of the rotating body starts can be set. There is an effect that the time adjustment until the operation becomes easy.

  According to the eighth and ninth aspects of the present invention, the rotating body can be easily incorporated as a safety device of the shutter device by rotating and connecting the rotating shaft with the winding shaft of the shutter curtain or the winding shaft itself. effective.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows roughly the rotary body braking device which is 1st Embodiment of this invention, (a) is a figure where the rotary body is stationary, (b) is the figure which is carrying out normal rotation at the time of a normal state (C) is a figure where the number of rotations of the rotating body increased rapidly. FIG. 5 is a cross-sectional front view schematically showing a rotating body braking apparatus according to a second embodiment of the present invention, where (a) is a diagram showing the rotating body being stationary, and (b) is a diagram showing a sudden increase in the rotational speed of the rotating body. FIG. FIG. 4 is a cross-sectional front view schematically showing a rotating body braking apparatus according to a third embodiment of the present invention, where (a) is a diagram showing the rotating body stationary, and (b) is a diagram showing a sudden increase in the rotational speed of the rotating body. FIG. FIG. 5 is a schematic cross-sectional view of a part of the rotary body braking device of the third embodiment shown in FIG. 3 that is connected to a winding shaft of a shutter curtain. Similarly, it is the schematic which carried out the partial cross section which used the rotary body braking device of 3rd Embodiment directly attached to the winding shaft of a shutter curtain. (A) shows the idler wheel of 4th Embodiment of this invention, (b) shows the perspective view of an idler wheel. (A) is a figure which similarly shows the other example of the idler wheel of 4th Embodiment, (b) is a perspective view of an idler wheel and a fastening body. (A) is the figure which incorporated the rotary body braking device of 5th Embodiment of this invention in the electrically-driven shutter apparatus, (b) is D arrow figure of (a), (c) is dividing an exterior box body into 2 parts It is a figure which shows the perspective view of other example which performed.

  Hereinafter, a first embodiment for carrying out the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a front view schematically showing a rotating body braking apparatus according to a first embodiment of the present invention. 1A shows a state in which the rotating body 3 is stopped, FIG. 1B shows a state in which the rotating body 3 is rotating at a normal rotation speed that is normal, and FIG. It is a figure which shows the state which the body 3 raises rotation speed rapidly, and is braked.

  In FIG. 1, reference numeral 1 denotes a rotating body braking device, and 2 denotes a part of a machine frame 2 on which the rotating body braking device 1 is fixed. Reference numeral 3 denotes a rotating body 3 that is rotatably supported by a bearing (not shown) that is fixed in position via the machine frame 2 and that is rotationally driven from an external rotational drive system or the like. An idler wheel 4 surrounding the rotator 3 is suspended on the outer peripheral surface 3a of the rotator 3 so as to be capable of rotating and laterally moving in the left and right (H direction) and up and down (V direction). A cylindrical or spherical rolling element 6 capable of rotating and revolving is held in the inner peripheral surface 4b in the gap 5 defined by the inner peripheral surface 4b of the idler wheel 4 and the outer peripheral surface 3a of the rotating body 3. ing.

  The outer diameter of the rolling element 6 is set to A <(BC), where A is the outer diameter of the rolling element 6, B is the inner diameter of the idler wheel 4, and C is the outer diameter of the rotating body 3. ing. FIG. 1A shows an initial state in which the rotating body 3 stops rotating, and the rolling element 6 is stopped at the position of the bottom of the inner peripheral surface 4b of the idler wheel 4 by the gravity W, And it has the space and the outer peripheral surface 3a of the rotary body 3 is held in a state where it does not contact. At this time, the idler wheel 4 is suspended in a state in which the upper part of the inner peripheral surface 4b and the upper part of the outer peripheral surface 3a of the rotating body 3 are in contact with each other and can rotate and move laterally up and down.

  At the upper position on the outer diameter side of the idler wheel 4, the separation distance until the movement restricting body 7 that prevents lateral movement of the idler wheel 4 upward (in the V direction) stops contacting with the outer peripheral surface 4 a of the idler wheel 4. With S set, it is fixed to the machine casing 2 or a structure not shown. By setting the separation distance S to be smaller than the outer diameter of the rolling element 6, the braking operation of the rotating body 3 described later is performed reliably. Denoted at 8 is a detecting means for detecting a state in which the idle wheel 4 is moved laterally upward and is in contact with the movement restricting body 7, and serves to notify the outside that the rotating body braking device 1 has been braked.

  FIG. 1B is a diagram illustrating a normal state in which the rotating body 3 is rotating at a normal speed. When the rotator 3 is rotated, for example, clockwise by an external rotation drive system, the upper part of the inner peripheral surface 4b of the idler wheel 4 is suspended in contact with the outer peripheral surface 3a of the rotator 3. It is rotationally driven in the same direction (clockwise) by the contact friction force. At the same time, the rolling element 6 held on the inner peripheral surface 4b of the idler wheel 4 is driven to revolve so as to rise in the same direction in the inner peripheral surface 4b by the rolling frictional force F caused by the rotation of the idler wheel 4 in the clockwise direction. Be made. Since the rolling element 6 generates a counterclockwise component force M of the gravity W, the intermediate position where the frictional driving force F and the component force M are balanced or a position in the vicinity thereof is maintained.

  When some abnormality occurs in the drive system that rotationally drives the rotating body 3 from the outside and the rotational speed suddenly increases and reaches a predetermined rotational speed, the rolling element 6 is moved to the inner periphery of the idler wheel 4 by the frictional force F and the rotational speed. The surface 4b rises clockwise from the intermediate position. This upward movement of the rolling element 6 is guided by the outer diameter of the outer peripheral surface 3 a of the rotating body 3 fixed to the machine frame 2 so as to be rotatable, and the idler wheel 4 is moved to the upper left of the gap 5. When the idle wheel 4 moves the separation distance S in the upper lateral direction and reaches the upper movement restricting body 7, the outer peripheral surface 4a of the idle wheel 4 comes into contact with the movement restricting body 7 and the upward lateral movement is stopped. Further, the rolling element 6 tries to advance in the gap 5 by the continuous rotation of the rotating body 3 and the idler wheel 4 in the clockwise direction. At this time, since the separation distance S is smaller than the outer diameter A of the rolling element 6, the shape of the gap 5 is formed in a tapered wedge shape by the outer peripheral surface 3a of the rotating body 3 and the inner wall 4b of the idler wheel 4 (S < A). The rolling element 6 held on the inner peripheral surface 4b of the idler wheel 4 rotated by the rotation of the rotor 3 bites into the entrance of the tapered wedge-shaped gap 5, and brakes the rotation of the rotor 3 and the idler wheel 4. And stop. At this time, the detection means 8 detects the idler wheel 4 that is in contact with the movement restricting body 7 and issues a signal indicating a state in which the rotating body braking device 1 is braked, and then instructs a necessary operation. This braking operation can adjust the time and magnitude until the rotating body 3 is braked by adjusting the distance S between the outer peripheral surface 4a of the idler wheel 4 and the movement restricting body 7.

  In order to cancel the braking operation of the rotation braking device 1 in which the rotation of the rotating body 3 is stopped, the rotating body 3 is rotated in the reverse direction with respect to the rotating direction or the movement restricting body 7 is moved upward to move the idler wheel 4. Allow upward movement. By this moving operation, the size of the gap 5 is enlarged, and the rolling element 6 can pass through the enlarged gap 5 (between the outer peripheral surface 3a and the inner peripheral surface 4b of the rotating body 3) and return to the bottom position. Therefore, the braking operation state can be canceled. With the above operation, a sudden increase in the rotational speed of the rotating body 3 can be reliably braked, and reliability and safety can be improved. Further, the operation once stopped by braking can be easily released. Furthermore, the rolling element 6 can be used any number of times without being damaged.

  FIG. 2 shows a second embodiment of the present invention, and members having the same functions as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In the second embodiment, a rotating body 3 rotatably supported by a bearing (not shown) provided in the machine casing 2, and surrounding the rotating body 3 to rotate and rotate left and right (H direction) and up and down (V direction). The configuration of the idler wheel 4 suspended in contact with the outer peripheral surface 3a and the inner peripheral surface 4b of the idler wheel 4 so as to be able to rotate and revolve in a state that can be laterally moved is the first embodiment. Is the same. In the present embodiment, an exterior box body 9 having a hollow cylindrical shape is provided so as to entirely surround the rotating body 3, the idler wheel 4, and the rolling element 6 and accommodate the inside. The exterior box 9 can be fixed to the machine frame 2 in a state where the relative position with the rotating body 3 rotatably held by the machine frame 2 can be adjusted. That is, the rotating body 3, the idler wheel 4, and the rolling element 6 are housed in a state of being sealed inside by an inner wall 9a of a hollow cylindrical outer box 9 and a lid (not shown) that closes both ends.

  The idler wheel 4 suspended on the upper part of the outer peripheral surface 3a of the rotating body 3 is configured to have a size that does not come into contact with the inner wall 9a of the cylindrical outer box 9 when it is laterally moved. That is, the distance (> S) larger than the separation distance S that moves in the upward direction (V direction) and contacts is set as the distance between the outer peripheral surface 4a of the idler wheel 4 and the inner wall 9a as the movement restricting body. That is, the distance between the outer peripheral surface 3 a of the rotating body 3 that holds the idler wheel 4 and the inner wall 9 a of the outer box 9 is short, and the rotating body 3 is arranged in an eccentric state close to the upper side of the outer box 9. . The outer box 9 is fixed to the machine frame 2 in this eccentric arrangement state, and includes a hollow cylindrical inner wall 9a and a lid (not shown) that covers the inner wall at both ends with the rotating body 3, the idler wheel 4, and the rolling element 6. The space 9b is kept sealed. By making the exterior box 9 a sealed structure, it is possible to prevent the risk of rust and the like occurring in the components of the apparatus due to moisture and dirt from the outside.

  FIG. 2A shows an initial state in which the rotating body 3 stops rotating. When the rotator 3 is stopped, the idler wheel 4 can rotate and move laterally up and down, left and right as the inner peripheral surface 4b contacts the outer peripheral surface 3a of the rotator 3 in the upper direction, as in the first embodiment. It is suspended by the rotary body 3 in the state. In the initial state in which the rotating body 3 is stopped, the top of the outer peripheral surface 4a of the idler wheel 4 and the inner wall 9a on the upper side of the outer box 9 are in an arrangement relationship in which a separation distance S is set.

  At the normal rotational speed of the rotating body 3, the rolling element 6 maintains the intermediate position shown in FIG. 1 (b) or a position in the vicinity thereof. However, when the rotating body 3 rises to a predetermined rotational speed due to an abnormality in a drive system that rotates the rotating body 3, the idler wheel 6 also rotates at a high speed, and the rolling element 6 is moved along the inner peripheral surface 4 b of the idler wheel 4. In the same direction (clockwise in FIG. 2B). At this time, the rolling element 6 rises while being guided by the outer peripheral surface 3a of the rotating body 3 rotatably supported by the machine casing 2, thereby pushing up the idler wheel 4 in the upper left lateral direction. After that, the idler wheel 4 moves upward by S distance and comes into contact with the inner wall 9 on the upper side of the outer casing 9 to prevent the upward movement. As shown in FIG. 2 (b), the rolling elements 6 have a separation distance S smaller than the outer diameter A of the rolling elements 6, so that they bite into the entrance of the gap 5 formed in a tapered wedge shape. The rotation of the wheel 4 is abruptly braked to stop the rotating body 3 and the idler wheel 4.

  FIG. 3 shows a third embodiment of the present invention. In the third embodiment, a rotating body 3 that is rotatably supported by a bearing (not shown) fixed to the machine casing 2 and a rotation that surrounds the rotating body 3 and is suspended on the upper portion of the outer peripheral surface 3a. The idler wheel 4 that can move left and right, up and down, and the rolling element 6 supported on the inner peripheral surface 4b of the idler wheel 4 so as to be capable of rotating and revolving have the same configuration as in the first embodiment. In the present embodiment, the exterior box 10 that surrounds and stores the idler wheel 4, the rotating body 3, and the rolling element 6 in a sealed state is formed in a box having an inner wall 10a that is rectangular, and is fixed to the machine frame 2. ing. On the inner wall 10 a on the upper side of the outer box 10, a locking bolt 11 that abuts on the outer peripheral surface 4 a due to the upward lateral movement of the idler wheel 4 and restricts the upward lateral movement is projected to the inside of the outer box 10. It is attached in a state that can be adjusted. The locking bolt 11 can be fixed to the exterior box 10 by tightening the fastening nut 12 with respect to the exterior box 10.

  FIG. 3A shows an initial state in which the rotating body 3 stops rotating. In the rotation stop state of the rotating body 3, the idler wheel 4 is suspended by the rotating body 3 in a state in which the upper inner wall 4 b contacts the top of the outer peripheral surface 3 a of the rotating body 3 and can rotate and move laterally. In the rotation stop state of the rotating body 3, the separation distance S is set as the distance between the top of the outer peripheral surface 4 a of the idler wheel 4 and the tip of the locking bolt 11 fixed through the upper inner wall 10 a of the outer box 10. Has been. When the idler wheel 4 laterally moves around the rotating body 3 in the left and right (H direction) and up and down (V direction), the outer peripheral surface 4a contacts only the locking bolt 11 and does not contact the other inner wall 10a. Is set to a separation distance S.

  In normal rotation, which is the normal state of the rotating body 3, the rolling element 6 maintains the intermediate position shown in FIG. 1 (b) or a position in the vicinity thereof. When the rotating body 3 rises to a predetermined high speed rotation, the rolling element 6 rises in the same direction (clockwise in the case of illustration) on the inner peripheral surface 4b by the high speed rotation of the idler wheel 4 driven by the rotating body 3, At the same time, it rises in the upper left direction while being guided by the outer peripheral surface 3 a of the rotating body 3. At this time, the rolling element 6 advances in the gap 5 while pushing the idle wheel 4 in the lateral movement direction at the upper left. The idler wheel 4 rises in the upper left direction, and the outer peripheral surface 4a comes into contact with the tip of the locking bolt 11 to prevent upward movement. At this time, as shown in FIG. 3 (b), the rolling element 6 bites into the entrance of the gap 5 formed in a tapered wedge shape by setting the separation distance S to be smaller than the outer diameter A of the rolling element 6. 3 and idle wheel 4 are braked and stopped. At this time, the detection means 8 detects the upward movement of the idle wheel 4, issues a signal indicating that the rotary braking device 1 performs a braking operation, and instructs a predetermined operation.

  FIG. 4 shows an example in which the rotating body braking device 1 according to the third embodiment is applied to a fall prevention device for the electric shutter 20. In FIG. 4, the electric shutter 20 attached to the upper part 23 of the opening of the building has a winding shaft 22 for moving the shutter curtain 21 up and down fixed to brackets 24 and 24 fixed to the upper part 23 of the building. The bearings 25 and 25 are rotatably supported. A sprocket 27 is fixed to an output shaft 26 a of an electric motor 26 that rotationally drives the electric shutter 20. A roller chain 30 that transmits the rotation of the sprocket 27 is wound around the sprocket 28 provided at the drive side end of the winding shaft 22, and the rotation of the lifting motion is transmitted to the winding shaft 22. At both ends of the winding shaft 22, machine casings 29 fixed to the upper portion 23 of the building are connected to both ends of the winding shaft 22 inside the outer casings 10 and 10 fixed to both ends. Rotating bodies 3, 3, idler wheels 4, 4 surrounding the rotators 3, and rolling elements 6, 6 that can be rotated and revolved held on the inner peripheral surfaces 4 b, 4 b of the idler wheels 4, 4. Each pair is provided.

  With the above-described configuration, when the shutter curtain 21 is lowered in the normal state, the shutter curtain 21 descends at a safe and slow speed, and the rotation of the winding shaft 22 is transmitted to the rotating body 3, and this rotation is in the same direction as the idler wheel 4. , And the rolling element 6 held inside the idler wheel 4 is positioned and rotated at the intermediate position or a position in the vicinity thereof. When an abnormality occurs in the rotational drive system and the like, for example, when the roller chain 29 is cut or the brake system of the electric motor 26 is broken, the shutter curtain 21 falls suddenly due to its gravity, and the shutter curtain The number of rotations of the winding shaft 22 of 21 increases rapidly. At this time, the rotational speeds of the rotating bodies 3 and 3 connected to the winding shaft 22 also increase rapidly, and the rotational speed of the idler wheel 4 rapidly increases accordingly. Due to this rapid increase in the rotational speed, the rolling elements 6 held on the inner wall 4b of the idler wheel 4 are rapidly rotated by the frictional force and increased rotation, and rise along the inner wall 4b. By the upward movement of the rolling element 6, the idler wheel 4 is also moved upward, and the movement is prevented by coming into contact with the tip of the locking bolt 11 fixed to the upper wall 10a of the exterior box body 10. At this time, the rolling element 6 bites into the entrance of the tapered wedge-shaped gap 5 of the gap 5 formed by the rotating body 3 and the idler wheel 4, and the rotor 3 and the idler wheel 4 are prevented from rotating and stopped. At the same time, the detecting means 8 detects the rise of the idle wheel 4 and issues a braking operation signal of the rotating body braking device 1 to instruct a predetermined operation. With the above configuration, the shutter curtain 21 can be reliably prevented from suddenly falling, and the reliability and safety of the shutter can be improved. Further, the detection means 8 can know that the rotating body braking device has performed a braking operation, and can quickly perform a predetermined return operation necessary after the braking operation. In this embodiment, one rotating body braking device 1 is provided at each end of the take-up shaft 22, but the same function can be achieved even if one is provided at either end.

  FIG. 5 shows another example in which the rotating body braking device 1 according to the third embodiment is applied to a fall prevention device for the electric shutter 20. In FIG. 5, a winding shaft 22 for moving the shutter curtain 21 up and down is fixed to brackets 24 and 24 fixed to the upper part 23 of the building. The bearings 25 and 25 are rotatably supported. A sprocket 27 is fixed to the output shaft 26 a of the electric motor 26 that rotationally drives the electric shutter 20, and the winding shaft 22 moves up and down via a roller chain 30 to a sprocket 28 provided at one end of the winding shaft 22. It conveys rotation. The rotating body braking device 1 is provided on the winding shaft 22 between the shutter curtain 21 and the bracket 24 at the driven side end of the winding shaft 22 provided with the sprocket 28. A winding shaft 22 that functions as the rotating body 3 is placed inside the outer box 10 that is fixed to the upper portion 23 of the building and is fixed to the machine frame 29 in a state of surrounding the outer diameter portion 22 a of the winding shaft 22. The surrounding idler wheel 4 and the inner peripheral surface 4b of the idler wheel 4 are provided with rolling elements 6 held so as to be capable of rotating and revolving. That is, in the present embodiment, a part of the winding shaft 22 is directly functioned as the rotating body 3 so that the configuration of the rotary braking device can be made compact.

  FIG. 6 shows a fourth embodiment of the present invention. An embodiment in which the rotating body braking device of the present invention can be easily assembled from the outside without disassembling the rotating shaft of the existing shutter to the existing electric shutter or rotary drive device already installed in a building or warehouse. It is shown. Hereinafter, members having the same functions as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. In this embodiment, the idler wheel 4s surrounding the winding shaft 22 such as an existing electric shutter and the other rotating body 3 is formed of spring steel which is an elastic metal body. The spring steel is formed into a predetermined size and shape by performing press working and quenching treatment. Even after the spring steel is once stretched into a flat plate shape, as shown in FIG. It is possible to return to the original idler wheel 4 by elastically returning to the idler wheel 4s.

  FIG. 6A shows a case where the idler wheel 4s is wound around the winding shaft of the electric shutter or the outer peripheral surface 3a of the rotating body 3 interlocked therewith, after the idler wheel 4s is once stretched, The state which wound and assembled | attached as the idler wheel 4s is shown. The idler wheel 4s is suspended so as to be able to rotate and horizontally move vertically and horizontally with respect to the rotating body 3, as in the first to third embodiments. A rolling element 6 is inserted into the gap 5 formed by the rotating body 3 and the idler wheel 4s and is held on the inner peripheral surface 4b of the idler wheel 4s so as to be able to rotate and revolve. The relationship between the outer diameter of the rolling element 6, the inner diameter of the idler wheel 4s, and the size of the outer dimension of the rotating body 3 is the same as that in the first to third embodiments.

  FIG. 7 shows another embodiment in which the rotating body braking device of the present invention can be assembled without disassembling the rotating shaft of an existing electric shutter already attached to a building or the like as in FIG. is there. The idler wheel 4 surrounding the rotator 3 is divided into two semicircular idler wheels 4w and 4w, and the ends thereof are engaged with each other to form a circular idler wheel 4. It is comprised from the fastening body 31 which consists of spring steel which clamp | tightens a diameter. The semicircular idler wheel 4w divided into two is formed with a concave and convex engaging portion at each end, and the idler wheel 4 can be formed by engaging the concave portion with the other convex portion. The fastening body 31 made of spring steel is a fastening body that has been press-molded and then quenched, and as shown in FIG. 7B, the idler wheels 4w and 4w are combined to form one circle. The diameter is held at a predetermined external pressure by a fastening body 31 made of spring steel.

  FIG. 7A shows that when the idler wheels 4w and 4w are assembled to the winding shaft of the electric shutter or the outer peripheral surface 3a of the rotor 3 linked thereto, the idler wheels 4w and 4w divided into two parts are first attached to the rotor 3 as shown in FIG. After the combination from the outer peripheral side, the fastening body 31 is extended in a flat plate shape, and then wound around the outer diameter of the idler wheels 4w and 4w and assembled as the idler wheel 4. FIG. The assembled idler wheels 4w and 4w form a circular idler wheel 4 and are suspended with respect to the rotating body 3 so as to be capable of rotating and laterally moving horizontally. A rolling element 6 is inserted into a gap 5 formed by the rotating body 3 and the idler wheel 4 and held on the inner peripheral surface of the idler wheel 4 so as to be capable of rotating and revolving. The relationship between the outer diameter of the rolling element 6, the inner diameter of the idler wheel 4, and the outer dimension of the rotating body 3 is the same as that in the first to third embodiments.

  FIG. 8 shows a fifth embodiment of the present invention. As in the fourth embodiment, the rotating body braking device 1 shown in FIG. 8 (a) also has the outer casing 10 of the rotating body braking device of the present invention without disassembling the rotating shaft of the existing electric shutter. It shows an example that can be easily assembled from the outside. In FIG. 8 (a), on the electric shutter 20 attached to the upper part 23 of the opening of the building, a winding shaft 22 for moving the shutter curtain 21 up and down is fixed to brackets 24, 24 fixed to the upper part 23 of the building. It is supported rotatably through bearings 25, 25 fixed to each other. The rotation of the up-and-down motion is transmitted to the take-up shaft 22 via the roller chain 30 to the electric motor 26, the sprocket 27, and the sprocket 28 that are rotationally driven to raise and lower the electric shutter 20. The rotating body braking device 1 is provided on the winding shaft 22 between the shutter curtain 21 and the bracket 24 at the driven side end of the winding shaft 22. As shown in the fourth embodiment, the idler wheel 4 surrounding the end of the winding shaft 22 that functions as the rotor 3 and the idler 4 held inside the idler wheel 4 so as to be capable of rotating and revolving are externally provided. After assembling, the exterior box body 10 in which these are assembled is fixed to the bracket 24 via bolts 32.

  FIG. 8B is a view as viewed in the direction of arrow D in FIG. 8A, and the open groove portion 10 a formed by cutting outward from the center of the outer shape of the exterior box 10 is substantially larger than the outer diameter of the rotating body 3. It is a groove having a width, and has a shape that opens outward from the center. With this open groove 10a, it can be easily inserted into the rotary body 3 that is the end of the existing winding shaft 22 from the bottom by being inserted from below. At the time of the assembly, the idler wheel 4 and the rolling element 6 already assembled to the rotating body 3 are inserted into the exterior box 10 to prevent the idler wheel 4 and the rolling element 6 from falling outside during operation. . Thereafter, a resin cap (not shown) covers the entire rotating body braking device, thereby preventing contamination by dust and moisture from the outside. FIG. 8C is a perspective view showing another example in which the exterior box body 10 is divided into two parts. By dividing the exterior box body 10 into two parts, the winding shaft 22 of the existing electric shutter can be made in the same manner as described above. Without disassembling, the exterior box 10 can be mounted on the winding shaft 22 from the outside with the idler wheel 4 and the rolling element 6 inside.

  Since it comprised in the exterior box 10 as mentioned above, it has the effect that the rotary body braking device of the present invention can be easily attached to an existing electric shutter device without disassembling the shutter take-up shaft or curtain. . Similarly, there is an effect that inspection and maintenance work of the rotating body braking device 1 can be performed without disassembling the electric shutter device. Although described as an electric shutter, it goes without saying that the present invention can also be applied to a manual shutter.

  In the present invention, even if the rotating body braking device 1 performs a braking operation, the rolling element 6 is not deformed and can be reused any number of times, and no replacement work is required. Further, after the braking operation of the rotating body braking device 1, when the rotating body braking device 1 is returned to the normal state after confirming and repairing the defective portion, the rotating body 3 may be reversely rotated. Thus, the rolling element 6 returns to the bottom position in the inner peripheral surface 4b of the idler wheel 4, and the braking device can be returned to the initial state.

  As described above, the present invention is not limited to the above-described embodiments or examples, and the rotation of the rotating body 3 has been described as the clockwise direction. However, the rotating body braking apparatus 1 functions similarly in the counterclockwise direction. Of course. This can brake the abnormal high-speed rotation of the rotating body 3 in the forward and reverse directions. Further, the detection means is not limited to the embodiment.

  Although the present invention functions with respect to a sudden increase in the number of rotations of the rotating body 3 and has been described here as an example applied to a shutter safety device, other safety devices such as a lift device, an elevator, an escalator, etc. You may apply to. Moreover, you may use as a clutch function which switches a rotation direction.

DESCRIPTION OF SYMBOLS 1 Rotating body braking device 2 Machine frame 3 Rotating body 4, 4w idle wheel 5 Gap 6 Rolling body 7 Movement restricting body 8 Detection means 9, 10 Exterior box body 10a Opening groove part 11 Locking bolt 20 Electric shutter 21 Shutter curtain 22 Winding Shaft 25 Bearing 29 Machine frame 30 Roller chain 31 Fastening body

A Outer diameter of rolling element B Inner diameter of idler wheel C Outer diameter of rotating body S Separation distance between outer peripheral surface of idler wheel and movement restricting body

Claims (9)

  A machine frame, a rotating body rotatably supported by the machine frame and driven to rotate, a cylindrical idler wheel supported on the outer peripheral surface of the rotor and capable of rotating and laterally moving, A cylindrical or spherical rolling element capable of rotating and revolving, which is located in a gap formed by a peripheral surface and an outer peripheral surface of the rotating body, and held on the inner peripheral surface of the idler wheel, and an outer diameter of the idler wheel It is composed of a movement restricting body fixed to the machine frame at an outer position, and when the rotating body has a predetermined number of rotations or less, the rolling element is located at an intermediate position of the gap or a position near the outer periphery of the rotating body. Held on the inner peripheral surface in a state of not contacting a surface, and when the rotating body exceeds a predetermined rotational speed, the idler wheel is laterally moved to abut against the movement restricting body to restrict lateral movement, The rolling element moves on the inner peripheral surface and enters into the gap formed in a tapered wedge shape. Rotator braking device, characterized in that to brake the rotary body by biting into.   The separation distance S between the outer peripheral surface of the idler wheel and the movement restricting body is given by S <A <(, where A is the outer diameter of the rolling element, B is the inner diameter of the idler wheel, and C is the outer diameter of the rotating body. 2. The rotating body braking device according to claim 1, wherein the rotating body braking device is set so as to satisfy a relationship of B-C).   3. The rotating body braking device according to claim 1, wherein the idler wheel is made of spring steel, and the idler wheel can be elastically returned to the idler wheel having a predetermined dimension after the idler wheel is extended into a flat plate shape.   The idler wheel is composed of a semicircular idler ring divided into two parts. Convex recesses that are engaged with each other are formed at both end portions of the semicircular idler ring, and the semicircular idler ring is combined. 4. The rotating body braking device according to claim 1, wherein the outer diameter of the idler-shaped idler wheel is fastened by a fastening body made of spring steel.   5. The rotating body braking device according to claim 1, wherein the movement restricting body includes an exterior box, and the exterior box includes the idler wheel, the rotating body, and the rolling element. .   The outer shape of the outer box body is configured such that an open groove having a width larger than the outer diameter of the rotating body is provided from the outer side of the outer box body to the center position, or the entire outer shape of the outer box body is divided into at least two parts. The rotating body braking device according to claim 1, 2, 3, 4 or 5.   The rotating body braking device according to any one of claims 1 to 6, wherein the movement restricting body includes a locking bolt capable of changing a separation distance S from the outer peripheral surface of the idler wheel.   The rotation according to any one of claims 1 to 7, wherein the rotating body is rotationally driven in connection with a winding shaft that winds and lowers a shutter curtain provided at an upper part of an opening of a building. System movement device.   9. The rotating body braking apparatus according to claim 8, wherein the winding shaft itself is used as a rotating body instead of the rotating body.

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