JPS5816073B2 - How to close the shutter - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for closing a shutter.

Conventionally, there have been two methods for lowering and closing a shutter from an open state: using the shutter's own weight and using a motor.

However, in the former case, when the shutter is at its highest position, it is difficult for its own weight to act on the take-up shaft as a moment in the descending direction. There was a flaw in that if the resistance was too high, the aircraft would not be able to descend.

In addition, the latter lowering method using a motor can eliminate the flaws of the former, but if there is an obstacle or malfunction of the lowering device when lowering the shutter, the shutter will be forcibly lowered by electric power, and the shutter will stop automatically. This resulted in a defect in that the shutter could be damaged.

Also, if it is necessary to close the shutter at high speed,
If the topmost shutter was not securely aligned with the guide rail, there was a risk that the shutter would become tangled when lowered, leading to a serious accident.

Furthermore, in the lowest position, applying the brake to the shutter at high speed would cause a shock and the stopping position would be uncertain, creating danger and damage to the equipment, making it difficult to implement.

In addition, a shutter opening/closing device was proposed (Japanese Utility Model Publication No. 52-49228) in which a motor lowers the shutter at low speed near the highest and lowest positions, and switches the motor to high speed in the middle to shorten the closing time. In the high-speed descending range, there was still a risk that the shutter device would be damaged, as mentioned above.

The first object of the present invention is to eliminate the above-mentioned deficiencies, and to provide a shutter that can reliably, quickly and safely start lowering the shutter whether it is in the highest position or halfway up, and that reduces power consumption. The objective is to provide a method of descent.

In addition to the first object, the second object of the present invention is to stop the shutter without shock when the shutter is moved to the lowest position, thereby preventing danger and increasing safety and durability. The purpose of this invention is to provide a method for lowering the shutter that is possible.

An embodiment of a shutter opening/closing device embodying the present invention will be described below with reference to FIGS. 1 and 2. In the drawings, 1 is a shutter, 2 is a winding drum, and a sprocket 3 is fixedly attached to the shutter.

Ml is a first motor for low speed, and M2 is a second motor for high speed. The motor M2 is connected to a second reduction gear 6, and a chain 9 is wound around the sprocket 8 fixed on the output shaft T and the sprocket 3.

B is connected to the rotating shaft of the first motor M1.

The electric brake 10 is attached to the side of the brake B and is a speed regulating mechanism for controlling the rotational speed of the rotating shaft of the first motor M1.

C is the first and second motor M1. This is a control circuit for M2 and electric brake B, and the circuit C is connected to a three-phase power source 11.

BSl, BS2. BS3 is a push button switch for raising, lowering, and stopping, respectively, and is connected to the control circuit C.

LSI is a limit switch that senses the upper limit of the shutter and stops the upward movement, LS2 is a limit switch that senses that the shutter has been wound up close to the upper limit and switches from the second motor M2 to the first motor M1, and LS3. LS4 is a limit switch for sensing the lower limit of the shutter and stopping the lowering operation; LS4 is a limit switch for sensing that the shutter has been rewound to near the lower limit and starting the first motor M1 in reverse; Each of the limit switches LS1 to LS4 is connected to the control circuit C and is actuated by an actuator (not shown) that is reciprocated by the output shaft T of the second reduction gear 6 in synchronization with the vertical movement of the shutter. It is now possible to do so.

Next, the control circuit C will be explained in detail with reference to FIG.

Terminals Zl, Z2 . of the three-phase power supply 11 . Z3 includes the first motor M1. A second motor M2 is connected and the two terminals Z1.
The electromagnetic brake B is connected to Z3.

The two terminals Zl and Z3 are further connected to the first to third circuits E and F, and the first circuit is connected to the push button switch BSI for lifting and the electromagnetic contactor for starting the first motor. M
CI, limit switch L for shutter 1 upper limit detection
SI is connected to the normally open contact MC of the magnetic contactor MCI.
1-1 is connected to the circuit of the first motor M1, and similarly, a self-holding contact MC1-2 is connected in parallel to the push button switch BSI.

A timer T1 is connected in parallel to the electromagnetic contactor MCI of the first circuit, which starts the second motor M2 after a certain period of time after the shutter 1 starts to rise to raise the shutter at high speed. is the limit switch L
S2, the electromagnetic contactor MC2 for starting the second motor M2 and the normally open contact T1-1 of the timer T1 are connected in parallel, and the normally open contact MC2-1 of the electromagnetic contactor MC2 is connected to the circuit of the second motor M2. It is connected.

The second circuit E includes a normally open contact MC of the magnetic contactor MCI.
I-3 and the electromagnetic brake B release relay R1 are connected, and the normally open contact R1-1 of the relay R1 is connected to the electric brake B circuit.

The third circuit F includes the push button switch BS2, the limit switch LS3, the electromagnetic contactor MC3 for starting the reverse rotation of the first motor M1, and the normally closed contact MC1- of the electromagnetic contactor MCI.
4 is connected to the normally open contact MC3 of the electromagnetic contactor MC3.
-1 is connected to the reversing circuit of the first motor M1, and a normally closed contact MC3-2 of the electromagnetic contactor MC3 is also connected to the first circuit.

Further, the normally open contact R1-2 of the relay R1 of the second circuit E is connected in parallel to the push button switch BS2 of the third circuit F.

A timer T2 is connected in parallel to the electromagnetic contactor MC3 of the third circuit F to stop the reverse rotation of the first motor M1 after a certain period of time after the shutter starts lowering, and to lower the shutter by its own weight. Closed contact T2-1 is connected to the third circuit.

Furthermore, the normally closed contact T2-1 of the third circuit F and the electromagnetic contactor M
The limit switch LS4 and a relay R2 for starting the reverse rotation of the first motor M1 are connected in parallel to C3, and the self-holding contact R2-1 of the relay R2 is connected to the limit switch LS.
Similarly, the normally open contact R2-2 is connected in parallel to the normally closed contact T2-1 of the timer T2.

The push button switch BS3 is connected between the three-phase terminal z1 and the first circuit.

Also, the first point above. Second motor M1. Thermal relays TH1゜TH2, TH3 are connected to the circuit of M2, and their normally closed contacts T)11-1. TH2-1 and TH3-1 are connected between the terminal z1 and the first circuit.

Next, the operation of the shutter opening/closing device constructed as described above will be explained.

Now, FIG. 2 shows a state in which the shutter is closed.

To open the shutter in this state, press the rising pushbutton switch BSI, which closes the first circuit, energizes the magnetic contactor MCI, closes the normally open contacts MC1-2, and self-holds the shutter. T1 is also activated and starts counting.

Then, the normally open contact MC1-3 of the second circuit E is closed, the relay R1 is energized, the normally open contact R1-1 is closed, the electric brake B is released, and at the same time, the electromagnetic contactor MCI
The normally open contact MC1-1 is closed, the first motor M1 is activated, and the shutter is raised at a low speed.

When the shutter is slightly opened and the timer T1 times up and its normally open contact T1-1 is closed, the magnetic contactor MC
2 is energized and its normally open contact MC2-1 is closed, so the second motor M2 is started and the shutter is wound up at high speed.

Even when the second motor M2 is started, the magnetic contactor MCI in the first circuit remains energized, so the first motor M1 is also rotated, but the one-way clutch 5 causes the second motor M2 to be connected to the first motor. M1 does not act as a load.

The shutter is wound at high speed, and the limit switch L
When S2 is opened, the normally open contact MC2-1, which is in the closed state, is opened as soon as the electromagnetic contactor MC2 is demagnetized, and the current supply to the second motor M2 is stopped.

Therefore, the shutter is wound up at low speed by the first motor M1.

When the shutter reaches the upper limit, the limit switch LSI is activated, so the first circuit is opened and the magnetic contactor MCI is demagnetized, stopping the current supply to the first motor M1. The open contact MC1-3 is opened, the relay R1 is demagnetized, the normally closed contact R1-1 is opened, the electromagnetic brake B is returned to the braking state, and the shutter is held in the released state.

By the way, FIG. 3a shows the above-mentioned shutter raising operation, with the horizontal axis showing the shutter raising position and the vertical axis showing the shutter raising speed above.

Push button switch BS3 to stop the shutter while it is rising at high speed
When you operate, the first and second circuits will be activated.

E is opened and the first and second motors M1. M2 is stopped and the shutter is stopped midway, but when the raising pushbutton switch BS1 is operated again from this state, the shutter is wound up at a low speed by the first motor M1 in the same way as the raising operation described above, and the shutter is wound up at a constant speed. It is wound up at high speed by the second timeless motor M2.

(Refer to the two-dot chain line in Figure 3a) Next, to close the shutter from the open state, use the lowering push button switch BS2 of the third circuit F.
When is pressed, the relay R1 of the second circuit E is energized, and its self-holding contact R1-2 self-holds the relay R1-6, and the normally open contact R1-1 closes and the electric brake B is released. Ru.

At the same time, the electromagnetic contactor MC3 of the third circuit F is energized, its normally open contact MC3-1 is closed, the first motor M1 is activated in reverse, the shutter is lowered at a low speed, and the timer T2 also starts counting.

When the shutter is slightly closed and can be automatically lowered, the timer T2 times up, and when the normally closed contact T2-1 is opened, the electromagnetic contactor MC3 is demagnetized, and the previously closed normally open contact MC3-1 is opened. First motor M in reverse rotation
1 is stopped.

However, since the relay R1-/J of the second circuit E remains held, the electric brake B is held in the released state, and therefore the shutter continues to descend due to the force of the downward movement by the first motor M1 and its own weight. be done.

Then, since the speed regulating mechanism 10 acts when the shutter is lowered by its own weight, by adjusting the set speed of the synchronizing speed mechanism, the lowering speed of the shutter due to its own weight can be made almost the same as the lowering speed by the motor M1, which is twice as high. It is also possible to set the speed to any speed such as the above.

Now, when the shutter is rewound to near the lowest position and the limit switch LS4 is activated, relay R2 is energized, and the self-holding contact R2-1 self-holds the same relay R2. The normally open contact R2-2 is closed and the electromagnetic contactor MC3 of the third circuit F is energized again, so the first motor M1 is started in reverse and the shutter, which was falling under its own weight at high speed, is switched to low speed and rewound. .

Then, when the shutter is moved to the lowest position and the limit switch LS3 is activated, the electromagnetic contactor M of the third circuit F
C3 is demagnetized, the first motor M1 is stopped, the relay R1 of the second circuit E is demagnetized, the electric brake B is returned to the braking state, and the shutter is closed.

The above-mentioned shutter lowering operation is schematically illustrated by a solid line in FIG. 3, in which the horizontal axis shows the shutter lowering position and the lower vertical axis shows the shutter lowering speed.

By the way, when you want to stop the shutter while it is falling under its own weight, when you operate the stop push button switch BS3, the relay R1 is demagnetized, so the electromagnetic brake B is returned to the braking state and the shutter is stopped.

To lower the shutter in this halfway stopped state, when the push button switch BS2 is operated, the first motor M1 is started in reverse at low speed in the same way as described above, and after a certain period of time, the timer T2 switches to dead weight lowering.

(See the two-dot chain line in Figure 3) The above explanation includes the improved invention of the present invention, but if only the specific invention is to be implemented, the following may be done.

That is, in the control circuit of FIG. 2, the limit switch LS4, the relay R2, and the normally open contacts R2-1 and R2-2 of the relay R2, which are connected in parallel to the third circuit F, are omitted.

Therefore, in this particular invention, the timer T2 times up and the current supply to the first motor M1 is stopped, the shutter starts the first heavy descent and is moved to the lowest position, and the shutter causes the limit switch LS3 to be turned on. When activated, the relay R1 is demagnetized, the electric brake B is returned to the braking state, and the shutter is locked in the closed state.

This lowering operation of the shutter is shown in FIG.

In this way, in the specific invention embodiment, the first motor M1 is rotated for a certain period of time by the timer T2 at the beginning of the shutter lowering operation to forcibly lower the shutter at a low speed, and after a certain period of time, current is supplied to the first motor M1. Since the shutter is stopped and the shutter is lowered by its own weight, it is possible to start the descent reliably and safely whether the shutter is at the highest position or halfway, preventing danger and reducing consumption. Power can be reduced.

Further, in the embodiment of the improved invention, in addition to the embodiment of the specific invention, the first motor M1 is started again by the limit switch LS4 near the shutter lowest position to rewind the shutter at a low speed. , it is possible to reduce the risk of damage by alleviating the impact when the shutter stops at the lowest position, and it is possible to further improve the durability of the shutter.

For this reason, in the improved invention, the speed of descent of the shutter due to its own weight can be made as fast as possible.

Note that the present invention is not limited to the above embodiments,
It is also possible to embody it as follows.

(B) In the above embodiment, after the first motor M1 starts lowering the shutter from the uppermost position, a timer is set to stop the motor M1 after a certain period of time to allow the shutter to fall under its own weight. A switch is installed (or shared) near the limit switch LSZ in FIG. 1 so that the current supply to the motor M1 is stopped and switched to dead weight lowering only when the shutter lowers by a certain amount.

In addition, in this other example, when the shutter is lowered from the middle, it is lowered only by the shutter's own weight, but since the shutter is in the middle, its own weight acts sufficiently as a lowering blade, so the lowering start operation will be delayed. There isn't.

(b) A circuit (not shown) that can perform only normal low-speed descent using a motor is incorporated into the above-mentioned device so that it can be used by switching.

Similarly, a circuit (not shown) capable of rapidly lowering the intermediate portion by a motor is incorporated and switched for use.

(c) In the above embodiment, the speed when opening the shutter is the first,
The second motors Ml and M2 are used to switch from low speed to high speed, but these are replaced by motors that can change the number of poles (not shown).
Then, the operating circuit of the motor (the first circuit D of the control circuit C described in the above embodiment) is arranged as shown in FIG.

. The operation of this other example is explained as follows.

When you press the push button switch BS1 for raising, the magnetic contactor MCI
is excited, the motor is started at a low speed, and the shutter is raised at a low speed. At the same time, the timer T1 starts counting, and the first circuit is maintained at a constant state by the normally open contact R3-1 of the relay R3.

After a certain period of time has elapsed, when the timer T1 times up, the magnetic contactor MC2 is energized, its normally open contact MC2-2 is opened, the magnetic contactor MCI is demagnetized, the motor is switched from low speed to high speed, and the shutter is raised at high speed. .

When the relay R4 is hoisted to the highest position, the limit switch LS2 energizes the relay R4, so the normally closed contact R4-2 of the relay R4 is opened and the electromagnetic contactor MC
2 is demagnetized and the high-speed rotation of the motor is stopped. At the same time, the normally open contact R4-1 of the relay R4 is closed, so that the electromagnetic contactor MCI is energized and the motor is switched to low-speed rotation again.

Further, when the shutter is moved to the upper limit, the limit switch LSI is opened, the motor is stopped, the electric brake B is restored, and the shutter is held in the released state.

As described in detail above, the specified invention starts the motor at low speed to start rewinding when the shutter is at the highest position, and after a predetermined period of time, stops supplying current to the motor to move the shutter under its own weight. By rewinding and closing the shutter, it is possible to quickly and reliably start the descent by eliminating the initial delay and stoppage of the descent operation that only occurs when the shutter is lowered by its own weight, and the shutter can be lowered using its own weight. This has the effect of reducing power consumption.

Moreover, in addition to the above-mentioned specific invention, the improved invention rotates the motor at a low speed near the highest position of the shutter, so that the impact when the shutter is stopped at the lowest position is alleviated and the danger is reduced. The shutter can be closed safely, the durability of the shutter can be increased, and the speed at which the weight of the shutter drops can be increased as much as possible, which has the effect of shortening the shutter closing time.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of a shutter opening/closing device implementing the present invention, Fig. 2 is a control circuit diagram, Fig. 3 is an explanatory diagram of the raising and lowering operation of the shutter, and Fig. 4 is an explanatory diagram of the operation of the specified invention. , FIG. 5 is another shutter opening operation circuit diagram. Shutter 1, first motor M1, push button switch BS2,
Limit switch LS4, magnetic contactor MC3゜

Claims (1)

[Claims] 1. When the shutter is at the highest position, the motor is started at low speed to start rewinding, and after a predetermined time, the current supply to the motor is stopped and the shutter is rewinded by its own weight. A method for closing a shutter, characterized in that the shutter is closed by 2. The shutter closing method according to claim 1, wherein the operation of stopping the current supply to the motor after a predetermined period of time has elapsed after starting the motor at a low speed is performed by a timer or a limit switch. 3 When the shutter is at the highest position, the motor is started at low speed to start rewinding, and after a predetermined period of time, the current supply to the motor is stopped and the shutter is rewound by its own weight, and then the shutter is lowered to the lowest position. When the shutter approaches the position, the motor is started again at a low speed to rewind and close the shutter. 4. According to claim 3, the operation of rewinding the shutter by its own weight and starting the motor again at low speed when the shutter approaches the lowest position is performed by a limit switch that detects the lowering of the shutter. How to close the shutter.