JPH0137549B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric opening/closing shutter for a garage or the like, and more particularly to an electric opening/closing shutter that can be manually opened/closed without applying the brake and enables emergency escape in the event of a power outage due to a fire or the like.

Conventionally, shutters at the entrances and exits of buildings, automobile garages, etc. are transitioning from manual shutters to electric shutters. In an electric shutter, the power to the operating motor is cut off to stop the shutter, and a brake device is activated to maintain the stopped state.

The brake of this type of electric shutter is normally operated by the pressing force of a spring when the motor is de-energized, and when the shutter is to be opened or closed, the brake electromagnet is activated at the same time as the shutter operating motor is energized. When energized, the electromagnetic attraction force cancels out the spring force and is linked to release the brake. However, in the event of a power outage due to a fire, etc., the brakes, which are activated by spring force, cannot be released by electromagnetic force, so open the shutter and escape outdoors, or move the car outdoors. This poses a safety problem.

The present invention solves these problems and provides an electric opening/closing shutter that is completely safe in terms of safety. The electric opening/closing shutter of the present invention has the following configurations:
An electromagnetic brake that operates the brake when energized is connected to the shaft of the motor, which is capable of forward and reverse rotation for hoisting and lowering the shutter, and is electrically connected so that the energization can be switched between the shutter operating motor and the electromagnetic brake. When the motor side is energized, no current passes through the electromagnetic brake and the brake is released, and when the motor side is de-energized to stop, the electromagnetic brake is energized, the brake is activated, and the power supply is cut off. At times, current does not flow to both the motor side and the electromagnetic brake side, so that the brake is released and the shutter can be opened and closed manually.

The present invention is applicable to various types of electric opening/closing shutters, such as a winding drum type, a ceiling transfer storage type, and a balance type. Explain and clarify the purpose of the invention.

FIG. 1 shows a longitudinal sectional front view of a winding drum type electric shutter embodying the present invention, in which shutter winding drums 2a and 2b are rotatable at the center and near both ends of a horizontal shaft 1 fixed to the upper part of a garage. In the central winding drum 2a, a drive shaft 5 extends from a shutter operating motor 4, which is attached to the horizontal shaft 1 and capable of rotating in forward and backward directions, relative to the internal gear 3 of the winding drum 2a.
The upper pinion 6 is engaged and driven, and the shutter 7, one end of which is attached to the periphery of the winding drums 2a and 2b, is wound up and pulled up, or rewound and lowered. At the extreme point of raising and lowering the shutter, the limit switches 22 and 23 (see Figure 3) cut off the power to the shutter operating motor 4.
is stopped, and in conjunction with this, energization is switched to the electromagnetic brake, which will be described later.

As shown in FIG. 2, the shutter operating motor 4 and the electromagnet 9 of the electromagnetic brake are in a common case 1.
It is stored within 0. The electromagnetic brake is motor 4
A base 13 of a brake disc 12 is attached to a shaft 11 extending from the pinion 6 to the opposite side, and the brake disc 12 faces the electromagnet 9 at a small distance, so that when the electromagnet 9 is de-energized, there is no contact between the two. The brakes will not work in this condition. The brake disc 12 and the base 13 are connected via a tension spring 15 on a thin ring plate attached by a coupling 14. When the electromagnet 9 is energized, the brake disc 12 moves forward (to the right) through the distance against the force of the tension spring 15 and is attracted to the fixed electromagnet 9, stopping the rotation of the base 13. A brake is applied to the shutter operating motor 4, and the shafts 5 and 11
to stop the shutter and securely hold the shutter in the stopped state.

FIG. 3 shows an example of a control circuit for a three-phase AC power supply.

Contact 27a, which is closed when relay A22 is activated from power source 16, and contact 2, which is closed when relay B is activated.
7b, and a capacitor 24 that switches the motor 4 between forward and reverse directions, and the motor 4 is energized via the relay A2.
2. Contacts 26a and 2 each open when B23 is activated.
6b and a rectifier 25 that converts alternating current into direct current from the same power source 16.

Relays A22 and B23 are operated by up switch 18, down switch 19, and stop switch 17 in separate circuits. 20 is an upper limit switch which normally shuts off at the upper limit of shutter 7 opening. Similarly, 21 is a lower limit switch. Further, 28a, 28b, 29a, and 29b are contacts that are opened or closed by relays A22 and B23, respectively.

Now turn on switch 1 to open shutter 7
When 8 is closed, relay A22 is activated, and the motor 4 is energized through the contact 27a, opening the shutter 7. At this time, since the contact 26a of the circuit to the brake electromagnet 9 is open, the brake is in a released state. When the shutter 7 is fully opened and the upper limit switch 20 is activated, the relay A22 is disconnected.
Since the contact 27a opens, the power to the motor 4 is cut off, and the motor 4 stops, and at the same time the contact 26a closes, so the circuit to the electromagnet 9 of the brake is energized and the brake is activated. Similarly, if you press the stop switch 17 while the shutter 7 is opening, the relay A
22 is turned off, the motor 4 is stopped, and the brake is activated. When closing the shutter 7, the switches 19 and 21 operate in the same manner.

Also, when the power supply 16 is cut off, the motor 4
Since neither the side nor the brake electromagnet 9 side is energized, the motor 4 is stopped and the brake is released.

If the power supply 16 stops due to a fire, etc., if there is a power outage after the indoor power distribution board, or if the power is cut off arbitrarily, the electric opening/closing shutter will be in an unbraked state from either the inside or outside of the shutter as described above. Can be easily opened with light human force against light resistance. Therefore, in the event of an emergency, you can manually open the shutter and escape to the outside, pull the car out of the garage, and start extinguishing the fire quickly through the shutter opening. It can be demonstrated. Since the electromagnetic braking force is normally working normally and the device is in a locked state, it is possible to reliably prevent theft.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a winding drum type electric shutter as an example of the present invention, FIG. 2 is an enlarged sectional side view of the shutter operating motor and electromagnetic brake portion, and FIG. 3 is an example of a control circuit. DESCRIPTION OF SYMBOLS 1...Horizontal shaft, 2a, 2b...Shutter winding drum, 3...Internal gear, 4...Shutter operating motor, 5...Drive shaft, 6...Pinion, 7...Shutter armor, 20, 21... ...Upper/lower limit switch, 9...Brake electromagnet, 10...Case,
11... shaft, 12... brake disc, 13...
... Base, 14 ... Connector, 15 ... Tension spring, 1
6...Power supply, 17...Stop switch, 18, 19
... Shutter open/close switch, 22, 23... Relay, 24... Capacitor, 25... Rectifier.

Claims (1)

[Claims] 1. An electromagnetic brake that operates the brake when energized is connected to the shaft of the motor for a shutter operating motor that can rotate in forward and reverse directions to drive the shutter hoisting and lowering mechanism, so that the energization can be switched between the shutter operating motor and the electromagnetic brake. When electrically connected and the motor side is energized, no current passes through the electromagnetic brake and the brake is released, and when the motor side is de-energized to stop, the electromagnetic brake is energized and the brake is activated. When the power supply is cut off, no current flows to both the motor side and the electromagnetic brake side.
An electric opening/closing shutter characterized in that the shutter can be opened and closed manually when the brake is released.