JP5117984B2 - Automatic closing device - Google Patents

Description

  The present invention relates to an automatic closing device that automatically lowers a shutter curtain installed in an opening of a building or the like based on a signal from a fire alarm facility or the like.

  Conventionally, when a fire, etc. occurs, the shutter curtain is lowered by its own weight based on the signal from the fire alarm facility, and the opening of the building is closed. When an obstacle is detected during the descent, the shutter curtain Various automatic closing devices for stopping the descent are known. For example, as disclosed in Patent Document 1 and Patent Document 2, a pinion rotated by a motor and a rack are engaged with each other by exciting a solenoid, and the brake operation wire is operated to the brake release side by the movement of the rack. The curtain is lowered by its own weight, the electric motor is stopped, the solenoid is de-energized, the engagement between the pinion and the rack is released, the brake operation wire is operated on the brake braking side, and the shutter curtain descent is stopped. Yes.

Further, as disclosed in Patent Document 3, the rack meshed with the pinion rotated by the electric motor moves, operates the brake operation lever to the brake release side, lowers the shutter curtain by its own weight, and excites the electromagnetic brake. The rack is moved by a spring, and the brake operation lever is operated to the brake braking side to stop the descent of the shutter curtain.
JP 2002-138780 A Japanese Patent Laid-Open No. 2005-76366 JP 2007-77719 A

  However, such a conventional device requires a plurality of drive sources of an electric motor and a solenoid or an electric motor and an electromagnetic brake, and has a problem that the structure is complicated.

  An object of the present invention is to provide an automatic closing device that can be operated on a brake braking side and a brake releasing side with a simple structure.

In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
In the automatic closing device that operates the brake operation member biased to the braking side to the opening side and lowers the shutter curtain by its own weight,
A motor that can rotate forward and reverse and an output shaft that is rotatably supported are connected via a one-way clutch that transmits only one-way rotation, and the output shaft can be operated by rotating the output shaft. And the one-way clutch transmits the rotation in one direction of the motor to the output shaft to operate the brake operation member, and the brake operation member is rotated in the other direction of the motor. The automatic closing device is characterized in that the output shaft is allowed to rotate by the urging force.

  The one-way clutch includes an outer case rotated by the motor, a clutch shaft attached to the output shaft, and a rolling element disposed between the outer periphery of the clutch shaft and the inner periphery of the outer case. The outer case may have an inclined portion that gradually approaches the outer periphery of the clutch shaft on the inner periphery. At that time, a cage for restricting the movement of the rolling element is rotatably provided between the inner circumference of the clutch case and the outer circumference of the clutch shaft, and a rotational resistor is provided between the cage and the fixed side. It is good also as a structure which provided.

  The brake operation member is a brake operation wire, and a lever member is attached to the output shaft. The lever member includes a cylindrical portion around which the brake operation wire is wound and an arm portion extending radially outward from the cylindrical portion. It is good also as a structure which connected the said brake operation wire to the said arm part.

  Since the automatic closing device of the present invention can switch the descent and stop of the shutter curtain simply by switching the forward / reverse rotation of the motor, it switches the descent and stop of the shutter curtain without requiring a plurality of drive sources. Can be obtained, and the structure is simplified. Further, since wiring to the motor is sufficient, the number of wirings can be reduced and wiring work is facilitated.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
As shown in FIG. 1, reference numeral 1 denotes a shutter curtain. The shutter curtain 1 is provided at an opening of a building, and is guided up and down in a vertical direction by being guided by a pair of guide rails 2 and 4 provided on both sides of the opening. Close or open the opening.

  For example, the shutter curtain 1 is formed by connecting a large number of strip-like slats, and the shutter curtain 1 is wound or pulled out by a winding shaft (not shown) to close or open the opening. To do. The winding shaft is rotated by an opening / closing mechanism 6, and the opening / closing mechanism 6 includes an electric motor that rotationally drives the winding shaft and a brake mechanism that brakes the rotation of the winding shaft, and the brake mechanism is a shutter curtain. Braking 1 weight drop.

  The opening / closing mechanism 6 is provided with an automatic closing device 10, and includes a sensor 12 for detecting smoke and heat in the building, an operation panel 14 for opening / closing operation, and an obstacle for detecting an obstacle while the shutter curtain 1 is descending. An object detection mechanism 16 and the like are also provided.

  The opening / closing mechanism 6, the automatic closing device 10, the sensor 12, the operation panel 14, the obstacle detection mechanism 16, the disaster prevention panel 18, and the control panel 20 are connected by a control line 21. Based on the signal from the operation panel 14, the control panel 20 controls the opening / closing mechanism 6 to raise and lower the shutter curtain 1.

  Further, the control panel 20 controls the automatic closing device 10 based on signals from the sensor 12 and the disaster prevention panel 18 in the event of a fire to release the braking of the opening / closing mechanism 6 and lower the shutter curtain 1 by its own weight. Close the opening. When the obstacle detection mechanism 16 detects an obstacle while the shutter curtain 1 is being lowered, the control panel 20 controls the automatic closing device 10 to stop the shutter curtain 1 from being lowered by braking the opening / closing mechanism 6.

  The control panel 20 is supplied with a commercial power supply and has a built-in battery (not shown). Even when the commercial power supply is shut off due to a power failure or the like at the time of a fire, the automatic closing device 10 is controlled by the battery to The curtain 1 can be lowered.

  As shown in FIGS. 2 to 7, a brake operation wire 22 as a brake operation member is connected to the automatic closing device 10 from the opening / closing mechanism 6, and the brake operation wire 22 includes a spring (not shown) in the opening / closing mechanism 6. Accordingly, the brake mechanism (not shown) of the opening / closing mechanism 6 is urged to the drawing side, and the brake operation wire 22 is pulled out, so that the brake mechanism of the opening / closing mechanism 6 is operated to the opening side.

  In the automatic closing device 10, an electric motor 26 that can rotate forward and backward is disposed in a case 24, and the electric motor 26 is connected to the control panel 20. A reduction gear 28 is attached to the electric motor 26, and an output shaft 34 is arranged coaxially with the drive shaft 30 of the reduction gear 28 and rotatably supported by a case 24 via a bearing 32. The drive shaft 30 and the output shaft 34 are connected via a one-way clutch 36.

  The one-way clutch 36 includes an outer case 38 that is fitted to the drive shaft 30 and rotates integrally, and a clutch shaft 40 that is fitted to the output shaft 34 and rotates integrally. The outer case 38 is formed with a storage hole 42 coaxially with the drive shaft 30, and the clutch shaft 40 is inserted into the storage hole 42, and between the inner periphery of the storage hole 42 and the outer periphery of the clutch shaft 40. In this embodiment, three rolling elements 44 using rollers are arranged at equal intervals in this embodiment. The rolling element 44 is not limited to a roller but may be a ball.

  On the inner periphery of the storage hole 42 of the outer case 38, recesses 45 are formed at three locations toward the outer side in the radial direction at equal intervals, and the recesses 45 are formed in a size that allows almost half of the rolling elements 44 to be inserted. Has been. An inclined portion 46 that gradually approaches the outer periphery of the clutch shaft 40 is connected to the recess 45 on one side in the rotational direction, and on the rear side in the forward rotation direction of the outer case 38 in this embodiment, as shown in FIG. Yes. When the rolling element 44 enters the inclined portion 46, the rolling element 44 is configured to move toward the center of the clutch shaft 40.

  A large number of arc-shaped grooves 40a corresponding to the outer diameter of the rolling element 44 are continuously formed on the outer periphery of the clutch shaft 40, and a large number of convex portions 40b are provided at equal intervals. When the rolling element 44 enters the inclined portion 46 and moves toward the center of the clutch shaft 40, the rolling element 44 enters the groove 40 a of the clutch shaft 40, and the rolling element 44 is in contact with the flat surface of the inclined portion 46 and the bottom surface of the groove 44 a. When the rolling element 44 is in the recess 45, the clutch shaft 40 can be rotated. In addition, it is also possible to form the outer periphery of the clutch shaft 40 in a columnar shape without forming the groove 40a or the convex portion 40b. In that case, the inclination angle of the inclined portion 46 may be reduced.

  The rolling elements 44 are rotatably inserted into three notches 50 formed in a retainer 48 provided coaxially with the output shaft 34. The retainer 48 is formed in a hollow shape, and the clutch shaft 40 and the retainer 48 can be rotated relative to each other via a bush 52 provided between the outer periphery of the clutch shaft 40 and the inner periphery of the retainer 48. It is configured.

  On the case 24 side, a regulating member 54 is non-rotatably mounted on the same axis as the output shaft 34, and a sliding hole 56 is formed on the regulating member 54 on the same axis as the output shaft 34. A cylindrical portion 58 formed in the cage 48 is inserted into the sliding hole 56, and a ring-shaped resistor 60 is inserted between the inner periphery of the sliding hole 56 and the outer periphery of the cylindrical portion 58. Yes. In this embodiment, a JIS standard O-ring is used for the resistor 60, and an appropriate rotational resistance is applied between the cage 48 and the regulating member 54 via the resistor 60. .

  The outer shape of the output shaft 34 projecting from the bearing 32 to the opposite side of the one-way clutch 36 is formed in an octagonal shape, forming an angular shaft portion 62, and a dog having an octagonal hole formed in the angular shaft portion 62. 64 is installed. A limit switch 66 is disposed so as to face the dog 64, and the limit switch 66 is operated by the rotation of the dog 64.

  Further, the tip of the angular shaft portion 62 of the output shaft 34 protruding outside the case 24 is inserted into an octagonal hole of the lever member 68, and the output shaft 34 and the lever member 68 are fixed. The tip of the brake operation wire 22 is connected to the tip of the lever member 68.

  As shown in FIG. 8, the lever member 68 includes a cylindrical portion 68a and an arm portion 68b extending radially outward from the cylindrical portion 68a, and the tip of the brake operation wire 22 is connected to the arm portion 68b. As the output shaft 34 rotates, the brake operation wire 22 is wound around the outer periphery of the cylindrical portion 68a.

  At this time, as shown in FIG. 8 (a), the distance L1 between the rotation center of the output shaft 34 and the connecting portion of the brake operation wire 22 to the arm portion 68b, and the cylindrical portion 68a from the rotation center of the output shaft 34. The relationship of the distance L2 to the center of the brake operation wire 22 wound around is arranged such that the distance L1 is larger than the distance L2 (L1> L2).

  When the motor torque of the electric motor 26 is constant, the brake operation wire is more at the distance L2 after being wound around the cylindrical portion 68a than at the distance L1 at which the brake operation wire 22 starts to be pulled out to the open side. The power to pull out 22 is increased. As shown in FIG. 9, when the stroke for pulling out the brake operation wire 22 is increased, the pulling force due to the rotation of the output shaft 34 is also increased.

  On the other hand, since the brake operation wire 22 is urged in the retracting direction by a spring (not shown), the urging force increases as the brake operation wire 22 is pulled out. The brake operation wire 22 can be wound around the cylindrical portion 68a and pulled out with a large force of the distance L2 against the urging force that becomes larger as it is pulled out, and the brake operation wire 22 can be pulled out reliably and the opening / closing mechanism 6 can be reliably braked. It can be opened.

  The dog 64 is also formed with an octagonal hole, and the angular shaft portion 62 is detachably inserted into the octagonal hole so that the dog 64 rotates integrally with the output shaft 34. The dog 64 is formed with a protrusion 64 a protruding outward in the radial direction, and the protrusion 64 a pushes down the limit switch 66.

  For example, as shown in FIG. 10A, when the dog 64 is mounted on the angular shaft portion 62 of the output shaft 34 and the output shaft 34 is rotated, the projection 64a is rotated by a predetermined angle, and then the protrusion 64a is moved to the limit switch 66. The limit switch 66 outputs a signal. When the drive of the electric motor 26 is stopped by this signal, the amount of drawing of the brake operation wire 22 corresponding to the rotation angle of the output shaft 34 is obtained.

  On the other hand, as shown in FIG. 10B, the dog 64 is mounted on the angular shaft portion 62 while being rotated 45 degrees counterclockwise from the state of FIG. When the output shaft 34 is rotated, the protrusion 64a is disengaged from the limit switch 66, but the protrusion 64a is disengaged from the limit switch 66 at a rotation angle smaller than the state shown in FIG. To do. Therefore, the amount of pulling out of the brake operation wire 22 is smaller than that in the state of FIG.

  On the other hand, as shown in FIG. 10C, the dog 64 is mounted on the angular shaft portion 62 while being rotated 45 degrees clockwise from the state of FIG. When the output shaft 34 is rotated, the protrusion 64a is disengaged from the limit switch 66, but the protrusion 64a is disengaged from the limit switch 66 at a rotation angle larger than the state of FIG. To do. Therefore, the amount of pulling out of the brake operation wire 22 is larger than the state shown in FIG.

  In this way, by adjusting the angle at which the dog 64 is attached to the square shaft portion 62, the amount of drawing of the brake operation wire 22 can be easily adjusted. In the present embodiment, the angular shaft portion 64 is an octagon, but the present invention is not limited to this, and a hexagon, a decagon, or a dodecagon may be used.

  In the present embodiment, the opening / closing mechanism 6 having the brake operation wire 22 is taken as an example of the brake operation member. However, the present invention is not limited to this, and the same is true even if the opening / closing mechanism 6 has a wire operation lever that swings as the brake operation member. Can be implemented. In that case, the brake operation lever may be arranged to be swung by the lever member 68 or the like.

Next, the operation of the automatic closing device 10 of this embodiment will be described.
When the shutter curtain 1 is wound around a winding shaft (not shown) by the opening / closing mechanism 6 and the opening is opened, the one-way clutch 36 has the rolling element 44 in the recess 45 as shown in FIG. The clutch shaft 40 is in a state in which it has escaped radially outward and can freely rotate in both forward and reverse directions. Therefore, the output shaft 34 and the lever member 68 can also freely rotate, the brake operation wire 22 is drawn by the urging force of the opening / closing mechanism 6, the winding shaft is braked by the brake mechanism of the opening / closing mechanism 6, and the shutter curtain 1 has its own weight. Do not descend.

  When a disaster prevention signal is input from the sensor 12 or the disaster prevention panel 18 to the control panel 20 due to a fire or the like, a normal rotation signal is input from the control panel 20 to the electric motor 26 of the automatic closing device 10.

  As a result, the electric motor 26 is driven, and the drive shaft 30 is rotationally driven in the forward rotation direction as shown in FIGS. 6 and 7, and the outer case 38 rotates in the forward rotation direction together with the drive shaft 30. When the outer case 38 rotates in the forward direction, the inclined portion 46 also rotates in the forward direction. At this time, the cage 48 is given rotational resistance by the resistor 60 and is inserted into the regulating member 54, so that the cage 48 does not rotate. The rolling element 44 is inserted into the notch 50 of the cage 48 and restricts the movement of the rolling element 44 in the circumferential direction.

  Therefore, the wall surface of the inclined portion 46 comes into contact with the outer periphery of the rolling element 44 and presses the rolling element 44 toward the center in the radial direction, thereby pressing the rolling element 44 against the outer periphery of the clutch shaft 40. The rolling element 44 enters the groove 40a of the clutch shaft 40, and the rolling element 44 is pressed against the bottom surface of the groove 40a.

  Accordingly, the rotation of the outer case 38 is transmitted to the clutch shaft 40 via the inclined portion 46 and the rolling element 44, and the output shaft 34 rotates in the forward rotation direction together with the clutch shaft 40. At this time, the retainer 48 also rotates in the forward rotation direction together with the outer case 38, the rolling element 44, and the clutch shaft 40 against the rotational resistance of the resistor 60. As the output shaft 34 rotates, the brake operation wire 22 is pulled out via the lever member 68 and the brake mechanism of the opening / closing mechanism 6 is released. Therefore, the shutter curtain 1 descends by its own weight and closes the opening. The dog 64 also rotates with the rotation of the output shaft 34. When the dog 64 rotates a predetermined amount, the limit switch 66 detects the rotation of the dog 64 and outputs a signal to the control panel 20.

  Even if the input of the drive signal to the electric motor 26 is interrupted after the shutter curtain 1 starts to descend due to its own weight, in this embodiment, since the reduction ratio of the speed reducer 28 is large, the brake operation wire 22 is attached. Due to the force, the drive shaft 30 is not rotated in the reverse direction. A worm wheel gear having a self-locking function may be used for the speed reducer 28, or a ball lock mechanism may be provided so as to restrict the rotation of the drive shaft 30 from the outside.

  When the obstacle detection mechanism 16 detects an obstacle and outputs a detection signal to the control panel 20 while the shutter curtain 1 is descending, the control panel 20 reversely rotates the electric motor 26 of the automatic closing device 10 in the reverse direction. Output a signal. As a result, the electric motor 26 rotates the drive shaft 30 in the reverse direction as indicated by an arrow in FIG.

  Therefore, the outer case 38 rotates in the reverse rotation direction together with the drive shaft 30, and the recess 45 rotates to the position of the rolling element 44 from the state shown in FIG. 7 so that the rolling element 44 enters the recess 45 and escapes radially outward. Is released from the groove 40a of the clutch shaft 40. At that time, the cage 48 is not rotated by the rotational resistance by the resistor 60 and restricts the rolling element 44 from moving in the circumferential direction.

  The clutch shaft 40 can freely rotate in both the forward and reverse directions, and the urging force of the brake operation wire 22 causes the output shaft 34 to rotate through the lever member 68, so that the brake operation wire 22 is pulled in, and the opening / closing mechanism 6. The take-up shaft is braked by this brake mechanism, and the descent of the shutter curtain 1 is stopped. Since the rotation amount of the outer case 38 may be an angle at which the rolling element 44 enters the recess 45, the shutter curtain 1 is lowered in a short time to stop the descent of the shutter curtain 1, and the descent amount of the shutter curtain 1 until the stop is small. .

  When the obstacle is removed and no obstacle detection signal is output by the obstacle detection mechanism 16, the control panel 20 outputs a normal rotation signal to the electric motor 26 of the automatic closing device 10. Thereby, the drive shaft 30 rotates in the forward rotation direction, and as described above, as shown in FIG. 7, the outer case 38 rotates in the forward rotation direction, and the rolling element 44 is pushed by the inclined portion 46. The rotation of the drive shaft 30 is transmitted to the output shaft 34. Therefore, the brake operation wire 22 is pulled out via the lever member 68, the brake mechanism of the opening / closing mechanism 6 is opened, and the shutter curtain 1 resumes lowering by its own weight again.

  Thus, since the automatic closing device 10 can switch the descent and stop of the shutter curtain 1 only by switching the forward / reverse rotation of the electric motor 26, the shutter curtain is not required without requiring a plurality of drive sources. Since the lowering and stopping of 1 can be switched, the structure is simplified. Moreover, since only the wiring to the electric motor 26 is sufficient, the number of wirings can be reduced and wiring work is facilitated.

  Since the drive shaft 30 and the output shaft 34 are directly connected by the one-way clutch 36, the rotation transmission efficiency is good. In addition, since the one-way clutch 36 is provided between the drive shaft 30 and the output shaft 34, the number of parts is small and the workability is excellent.

  The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

It is explanatory drawing which has arrange | positioned the shutter using the automatic closing apparatus as one Embodiment of this invention in the opening part of the building. It is a front view which shows the principal part of the automatic closure apparatus of this embodiment in a cross section. It is a principal part expanded sectional view of the automatic closure apparatus of this embodiment. It is a top view of the automatic closure device of this embodiment. It is a side view of the automatic closure device of this embodiment. FIG. 4 is an AA enlarged sectional view of FIG. 3 in a brake braking state. It is AA expanded sectional drawing of FIG. 3 of a brake open state. It is explanatory drawing which shows the change of the attractive force by rotation of the lever member of this embodiment. It is a graph which shows the relationship between the stroke of the brake operation wire by rotation of the lever member of this embodiment, and pulling force. It is explanatory drawing which shows the mounting relationship of the output shaft and dog of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shutter curtain 2, 4 ... Guide rail 6 ... Opening / closing mechanism 10 ... Automatic closing device 12 ... Sensor 14 ... Operation panel 16 ... Obstacle detection mechanism 18 ... Disaster prevention panel 20 ... Control panel 22 ... Brake operation wire 24 ... Case 26 ... Electric motor 28 ... Speed reducer 30 ... Drive shaft 34 ... Output shaft 36 ... One-way clutch 38 ... Outer case 40 ... Clutch shaft 44 ... Rolling element 45 ... Dimple 46 ... Inclined portion 48 ... Retainer 50 ... Notch 60 ... Resistor 64 ... Dog 66 ... Limit switch 68 ... Lever member

Claims (4)

In the automatic closing device that operates the brake operation member biased to the braking side to the opening side and lowers the shutter curtain by its own weight,
A motor that can rotate forward and reverse and an output shaft that is rotatably supported are connected via a one-way clutch that transmits only one-way rotation, and the output shaft can be operated by rotating the output shaft. And the one-way clutch transmits the rotation in one direction of the motor to the output shaft to operate the brake operation member, and the brake operation member is rotated in the other direction of the motor. An automatic closing device that allows rotation of the output shaft by urging the power. The one-way clutch includes an outer case rotated by the motor, a clutch shaft attached to the output shaft, and a rolling element disposed between the outer periphery of the clutch shaft and the inner periphery of the outer case. 2. The automatic closing device according to claim 1, wherein an inclined portion that gradually approaches the outer periphery of the clutch shaft is formed on the inner periphery of the outer case. Between the inner periphery of the clutch case and the outer periphery of the clutch shaft, a cage that restricts the movement of the rolling element is rotatably provided, and a rotational resistor is provided between the cage and the fixed side. The automatic closing device according to claim 2. The brake operation member is a brake operation wire, a lever member is attached to the output shaft, and the lever member includes a cylindrical portion around which the brake operation wire is wound, and an arm portion extending radially outward from the cylindrical portion, The automatic closing device according to any one of claims 1 to 3, wherein the brake operation wire is connected to the arm portion.

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