JPH10167638A - Door braking device - Google Patents

Abstract

(57) [Summary] A door is safely decelerated and stopped without hindering rescue and confinement by manual opening and closing when a door control abnormality or a power failure occurs. Kind Code: A1 A braking force is applied to a door only during a predetermined period after a door control abnormality or a power failure, or only when the door is at or above a certain speed after a door control abnormality or a power failure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a door brake device.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 5-262483 and Japanese Patent Application Laid-Open No. 7-315734, a conventional door brake device is used to prevent free-run when door control is stopped. A configuration for operating a uniform door brake is known.

[0003]

In the conventional door brake device, when the control of the door is stopped as described above, the brake is operated uniformly, so that, for example, the power supply is lost due to a power failure or the like, and the motor control circuit is not operated. When the abnormality continues, it is difficult to manually open and close the door, and there is a problem that the rescue of passengers is hindered.

Therefore, an object of the present invention is to operate a brake only for a predetermined period after a door control abnormality or a power failure as described above.

[0005]

SUMMARY OF THE INVENTION In one aspect, a brake device according to the present invention is provided with a means for supplying power to a brake operation circuit for a predetermined period when a door control is abnormal or a power failure occurs.

According to another aspect of the present invention, a means is provided for contacting the rotating portion of the brake device with the fixed portion if the rotating portion of the brake device is at least a predetermined rotation.

[0007]

FIG. 1 shows the construction of a door brake device according to an embodiment of the present invention, and FIGS. 2 and 3 show the functional construction of a brake circuit 30 in FIG.

In FIG. 1, a brake drum 20 is connected to a movable portion (eg, a motor) 10 of a door, and rotates in conjunction with the movement of the door. The brake coil 22 drives the brake shoe 21 by applying power from the control circuit 30.
The brake shoe 21 is pressed against the brake drum 20 when the power of the brake coil 22 is applied, and brakes the rotating unit 10 to suppress the movement of the door. When power is not applied to the brake coil 22, the brake shoe 21 is separated from the brake drum 20 by the spring 23. In FIG. 2, the control power supply 31
Is a conductive contact 36a when the diode 32 and the contactor 36 are energized.
Then, electric energy is stored in the capacitor 33 via the resistor 34. The electric energy stored in the capacitor 33 is
The braking operation is obtained by pressing the brake shoe 21 against the brake drum 20 by applying the brake shoe 22 to the brake coil 22 through the deenergized conduction contact 36 b and the resistor 34. When the door is operating, the contactor 36 is energized to stop the application to the brake coil 22 and the brake shoe 21 and the brake drum 20
, The capacitor 33 is charged so as not to hinder the movement of the rotating unit 10. In FIG. 3, the command buffer 37 controls the application of the power supply 35 to the contactor 36, and applies the power supply 35 to the coil of the contactor 36 to activate the contactor 36 when the door is operating. When the door is stopped, the application of the power supply 35 is stopped, and the contactor 36 is deenergized.

Here, when power is lost due to a power failure or the like, the power supplies 31 and 35 are lost, and the contactor 36 is deenergized regardless of the state of the command buffer 37. Then, the capacitor 33
The power stored in the contactor 36 is turned on when the contactor 36 is deenergized.
b, the discharge is started in the path of the brake coil 22 and the resistor 34. The power is applied to the brake coil 22 and the brake shoe 21 is pressed against the brake drum 20 for a predetermined period until the power of the capacitor 33 is completely discharged, thereby braking the rotating unit 10.

On the other hand, when the door control is stopped under conditions other than the power loss, such as the inability to control the door drive motor, the contactor 36 is deenergized by the command buffer 37 to perform the same braking operation as when the power is lost. obtain. The braking time can be arbitrarily set by selecting the capacitor 33 and the resistor 34.

FIG. 4 shows the construction of a door brake device according to a second embodiment of the present invention. 5 and 6 show the functional configuration of the brake circuit 60 in FIG. 4, and FIG. 7 shows the functional configuration of the brake drum 50 in FIG.

In FIG. 4, the brake drum 50 is connected to a movable portion (eg, a motor) 40 of the door, and rotates in conjunction with the movement of the door. The brake coil 52 drives the brake shoe 51 by applying power from the control circuit 60.
The brake shoe 51 moves to a position where it cannot contact the brake drum 50 when the power of the brake coil 52 is applied.
When no power is applied to the brake coil 52, the brake shoe 51 is pushed back by the spring 53 to a position where it can contact the brake drum 50. In FIG. 5, the control power supply 61 is applied to the brake coil 52 through the energizing conduction contact 64 a by the energization of the contactor 64, and moves the brake shoe 51 away from the brake drum 50. When the door is operated, the contactor 64 is energized to apply the power supply 61 to the brake coil 52 so that the brake shoe 51 and the brake drum 50 do not come into contact with each other so that the movement of the rotating unit 40 is not hindered. In FIG. 6, the command buffer 63 controls the application of the power supply 62 to the contactor 64, and energizes the contactor 64 by applying the power supply 62 to the coil of the contactor 64 when the door is operating. When the door stops, the application of the power supply 62 is stopped and the contactor 64 is deenergized.
In FIG. 7, the outer wall 54 of the brake drum is pulled inward by a spring 55 to have a diameter DL when the rotation of the drum is stopped. When the drum rotates, the brake drum outer wall 5
4 is configured to move outward due to centrifugal force and to have a diameter DH when the rotation exceeds a certain rotation. Brake shoe 51
Between the brake drum 50 and the brake drum 50
When the brake shoe 51 is pushed back by the spring 53 under the condition that the rotation of the brake shoe 51 is equal to or more than a certain value, that is, the diameter is DH, the brake shoe 51 and the brake drum 50 come into contact.

Here, when the power supply is lost due to a power failure or the like, the power supplies 61 and 62 are lost, and the contactor 64 is de-energized regardless of the state of the command buffer 63. Then, the power supply to the brake coil 52 is cut off, and the brake shoe 51 is pushed back to the brake drum 50 side. At this time, if the rotation of the brake drum 50 is equal to or more than a certain value, the brake shoe 51
And the brake drum 50 come into contact with each other to brake the rotating unit 40.

On the other hand, when the door control is stopped under conditions other than the power loss, such as the inability to control the door drive motor, the contact buffer 64 is deenergized by the command buffer 63 to perform the same braking operation as when the power is lost. obtain. The braking time can be arbitrarily set by selecting the brake drum outer wall 54 and the spring 55.

[0015]

According to the present invention, it is possible to safely decelerate and stop the door without interfering with rescue or confinement by manual opening / closing in the event of door control abnormality or power failure.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a door brake device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a brake control circuit in FIG.

FIG. 3 is a control circuit diagram of the contactor in FIG. 2;

FIG. 4 is an explanatory view of a door brake device according to a second embodiment of the present invention.

FIG. 5 is a circuit diagram of a brake control circuit in FIG. 4;

FIG. 6 is a control circuit diagram of the contactor in FIG.

FIG. 7 is an explanatory diagram of functions of a brake drum in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Door movable part, 20 ... Brake drum, 21 ... Brake shoe, 22 ... Brake coil, 23 ... Spring, 30
... Brake control circuit.

Claims (2)

[Claims] 1. A door brake device for an electrically operated door which operates a brake for a predetermined period after a control abnormality of the door or a power failure. 2. The door brake device according to claim 1, wherein the predetermined period is a period from a stop of driving the door until a predetermined time elapses, or a period in which the door speed is equal to or higher than the predetermined speed.