JPH0419997Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a limit switch confirmation display device for an electric shutter in which the shutter curtain is raised and lowered by forward and reverse driving of a drive motor for a two-phase AC power source. be.

[Prior art and problems to be solved by the invention] Generally, this type of electric shutter moves the shutter curtain to a raised position (fully open position) or a lowered position by detecting the upper and lower limit switches provided on the upper and lower sides, respectively. Conventionally, adjusting the detection position of each of these limit switches has been done without the small "click" sound that the microswitches that make up the limit switch make when switching. I was making decisions based on what I heard. Therefore, if you fail to hear the operating sound, you may be wondering if the drive motor has stopped due to the limit switch detection, or if the drive motor is still energized and the seat plate installed at the lowest end of the shutter curtain is not moving properly. It is not clear whether the drive motor is in a so-called motor lock state in which the operation of the drive motor is stopped mechanically due to a collision, etc. Therefore, adjusting the limit switch is not worth the time and effort, especially in the latter case. If left as is, the drive motor may seize and become damaged, which poses a problem. In addition, the shutter curtain is provided with a take-up ammunition machine interposed between an immovable take-up shaft and a take-up wheel loosely fitted to the take-up shaft so as to be freely rotatable. If the shutter curtain is raised and lowered electrically using force as an auxiliary winding torque, when the shutter curtain has risen to the point where it is fully open and the seat plate has reached the vicinity of the magus, the winding wheel will not be able to unwind it. Since the shutter curtain has a small weight, the stored force of the retractor is stronger than its weight. Therefore, even if the drive motor is stopped due to the detection operation of the limit switch, the shutter curtain cannot be retracted. It has the disadvantage that it is difficult to tell at what point the limit switch is activated because it is wound up by the ammo's stored power and becomes fully open.

Therefore, it has been proposed to provide an indicator lamp that lights up only when the drive motor is in operation, but since the drive motor uses a power circuit structure that operates in forward and reverse directions to raise and lower the shutter curtain, it is compatible with forward and reverse rotations. Since each line must be provided with two corresponding indicator lamps for ascending operation and descending operation, there is a disadvantage that the number of parts inevitably increases.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a limit switch confirmation display device for an electric shutter that can eliminate these drawbacks. A hand switch is provided in one of a pair of power lines leading from a two-phase AC power source to the drive motor, and branches the line in parallel, and a hand switch is provided in one line of a pair of power lines leading from the two-phase AC power source to the drive motor. An upper limit is provided in each branch circuit leading to one end of the forward/reverse coil and in each corresponding branch circuit, and opens when the shutter curtain reaches the upper limit position or lower limit position to cut off power supply to the drive motor. The shutter curtain is equipped with limit switches for the lower limit and lower limit, and a phase advance capacitor connected between the limit switches of both branch lines and the line connecting the forward/reverse coils. In an electric shutter configured to move up and down to a predetermined upper limit position or lower limit position opened by a limit switch, a circuit to which a phase advance capacitor of one of the branch circuits is connected. and the other power supply line leading from the AC power supply to the other end of each forward/reverse coil of the drive motor, having a current limiting impedance sufficiently large to the extent that the impedance of the phase advancing capacitor can be ignored. A light emitting element is interposed so that the light emitting element lights up when the front switch is switched to a branch circuit for either forward rotation or reverse rotation, and the limit switch on the switched side is closed; The present invention is characterized in that the light is turned off when the limit switch is open so that the opening/closing operation of the limit switch can be confirmed.

With this configuration, the present invention allows the drive motor to be driven in forward and reverse directions with a single light emitting element, although the drive motor has respective power supply lines for forward and reverse rotation.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a shutter curtain of an electric shutter, and the shutter curtain 1 is wound around a winding wheel 3 that rotates around an immovable winding shaft 2 installed above an opening.
Or by being rewound, the guide rail 4
It is designed to move up and down along the lines to open and close the opening. The rotation of the winding wheel 3 is as follows:
This is performed by the forward and reverse rotation of a drive motor 6 driven by a two-phase AC power supply built into the switch 5, and the power supply line for the drive motor 6 is as shown in FIG.

That is, one power supply line 7 leading to the AC power supply E
are branched by a hand switch 8 installed in an appropriate location such as a remote control room, and the switch terminals U and D are connected to one end of the forward/reverse coil of the drive motor 6, respectively, and are connected to branch lines 7a and 7a, respectively. 7b
is formed. And the branch lines 7a, 7
Limit switches 9 and 10 are respectively provided on the upper and lower sides of the guide rail 4, and the limit switch 9 connected to one of the ascending branch lines 7a is set at the upper position of the guide rail 4 in order to detect that the shutter curtain 1 has reached the upper limit position. A limit switch 10, which is connected to the other downward branch line 7b, is provided at a lower position of the guide rail 4 to detect that the lower limit position of the shutter curtain 1 has been reached. This is for the lower limit.
Further, a phase advance capacitor C is provided between the two branch lines 7a and 7b, and is located closer to the drive motor 6 than the limit switches 9 and 10, and is used to create a phase difference with respect to the forward and reverse rotation coils of the drive motor 6. However, in this embodiment, the capacitance is set to 3 microfarads (μF). On the other hand, the other power supply line 11 leading to the AC power source E is connected to the other end of the forward/reverse rotation coil of the drive motor 6, thereby forming a power supply circuit for controlling the forward/reverse rotation of the drive motor 6. . In addition, 12 is the other power supply line 11
This is a fuse installed in the

In such a power supply circuit, in this embodiment, a connection is made between the line where the phase advance capacitor C of the ascending side branch line 7a is connected and the other power supply line 11 to such an extent that the impedance of the phase advance capacitor can be ignored. A neon lamp 13 is provided with a sufficiently large current limiting resistor of 33 kilohms (kΩ).

In the embodiment of the present invention constructed as described above, in order to lower the shutter curtain 1 and close the opening, it is sufficient to switch the hand switch 8 to the terminal D of the descending branch line 7b. As a result, the drive motor 6 is driven to rotate, and the shutter curtain 1 is lowered. When the shutter curtain 1 reaches the lower limit position, the seat plate 1a contacts the lower limit switch 10 and opens it, thereby stopping the drive motor 6. On the other hand, in order to raise the shutter curtain 1 and open the opening, it is sufficient to switch the hand switch 8 to the rising side terminal U. 1a contacts the upper limit switch 9 to open it, and the drive motor 6 stops.

In this way, the opening/closing operation of the shutter curtain 1 is performed based on the switching of the hand switch 8, but when installing such an electric shutter in an opening or performing subsequent inspection and maintenance, it is necessary to use the hand switch 8. No matter which side of the terminals U and D 8 is switched, the neon lamp 13 lights up when power is being supplied to the drive motor 6.

In other words, in this device, when the hand switch 8 is operated to the terminal D or U side, and the limit switch 10 or 9 on the operated side is closed and power is being supplied to the drive motor 6,
Since the phase advance capacitor C has a capacitance of 3μF, for example, when 50 hertz (Hz) AC power is applied,
The impedance Z is Z=1/(2πHC) = 1/(2×3.14×50×3×10 ^-6 ) ≒1.06kΩ (approximately 0.88kΩ in the case of 60Hz). Therefore, between the branch line 7b and the other power supply line 11, the impedance of about 1 kΩ of the phase advancing capacitor C is sufficiently large to be ignored for the neon lamp 13 having a current limiting resistance of 33 kΩ. Small and handy switch 6
is switched to either the forward rotation or reverse rotation side branch line 7a, 7b, and the limit switch 9 or 10 on the switched side is closed, and either the forward rotation or reverse rotation is connected to the power source for the drive motor 6. If it is in the power supply state, a closed circuit of the neon lamp 13 is formed through the phase advance capacitor C, and thereby it is possible to determine whether or not the drive motor 6 is in the power supply state.
This means that the neon lamp 13 can be seen with certainty.

As a result, for example, when trying to adjust the lower limit switch 10, with the hand switch 8 switched to the lowering terminal D side, the seat plate 1a is lowered to the lower limit position where it just reaches the floor surface. The lower limit switch 10 may be adjusted so that the neon lamp 13 is turned off, and the upper limit switch 9 can be adjusted in the same manner. In this way, each limit switch 9, 10 for the upper and lower limits can be adjusted while visually checking whether one neon lamp 13 is turned on or off, which greatly simplifies the adjustment work and greatly improves work efficiency. Not only can you measure improvements, but you can also make precise adjustments. Furthermore, if the neon lamp 13 is lit even though the shutter curtain 1 is stopped, even a general user can immediately determine that there is an abnormality, and based on this, immediately request maintenance, etc. As a result, it is possible to prevent the drive motor 6 from seizing or damage due to the motor being left in the locked state. In addition, this type of defect in limit adjustment can be detected by using a single neon lamp instead of using separate neon lamps for upper and lower limits, which has the advantage of reducing the number of parts and simplifying the wiring structure. There is.

Note that the present invention is not limited to the above-mentioned embodiments, and the neon lamp may be a light-emitting element such as a light-emitting diode, and a light-emitting diode that has directionality in current flow may be used as a rectifier diode. It is preferable to connect the AC current to the light emitting diode in series so that only one of the alternating currents flows through the light emitting diode.

In addition, since the current limiting resistor is used in an AC power supply, it can be regarded as a current limiting impedance, and furthermore, the current limiting resistor,
In other words, it goes without saying that the ratio between the current limiting impedance and the impedance of the phase advancing capacitor C is not limited to the ratio in the above embodiment, but can be changed in various ways depending on the conditions of the light emitting element. .

[Operation and Effect] In summary, since the present invention is constructed as described above, the resistance is connected between the other power supply line and one of the branch lines, and the resistance is connected between the two branch lines. The light-emitting element, which is set to a value so large that the impedance of the connected phase advance capacitor can be ignored, is used when the hand switch is switched to either forward or reverse branch circuit, and the limit switch on the switched side is closed. I'm doing it,
If the drive motor is in either the forward or reverse power supply state, a closed circuit of the light emitting element is formed through the phase advance capacitor and lights up. However, it can be visually confirmed by visually observing the single light emitting element that lights up based on this.

As a result, the limit switch can be adjusted by simply switching the hand switch to either branch line and adjusting it so that one light emitting element turns off when the seat plate reaches the upper and lower limit positions, and the adjustment work is simple. This not only greatly simplifies the process and greatly improves work efficiency, but also allows accurate adjustment. Moreover,
If the light emitting element is lit even though the shutter curtain is stopped, you can immediately determine that power is being supplied to the drive motor and that the limit switch is maladjusted, and actively urge the limit switch to be adjusted. It is possible to reliably prevent seizure and damage to the drive motor caused by leaving the motor in the locked state. And, we can solve this problem of limit adjustment without using each light emitting element dedicated to the upper and lower limits.
Since it can be distinguished by using a single light-emitting element,
It has the advantage of having a small number of parts and a simple wiring structure.

[Brief explanation of the drawing]

The drawings show an embodiment of the limit switch confirmation display device for an electric shutter according to the present invention, in which Fig. 1 is a schematic front view of the electric shutter, Fig. 2 is a power circuit diagram of the drive motor, and Fig. 3 is a schematic front view of the electric shutter.
Figures A and B are power supply circuit diagrams during ascending operation;
Figures A and B are power circuit diagrams during lowering operation. In the figure, 1 is a shutter curtain, 1a is a seat plate,
2 is a winding shaft, 3 is a winding wheel, 4 is a guide rail, 5 is a switch, 6 is a drive motor, 7 is a line, 7a, 7b are branch lines, 8 is a hand switch,
9 and 10 are limit switches, 11 is a line, 12
13 is a fuse, 13 is a neon lamp, E is an AC power supply, C is a phase advance capacitor, and D and U are terminals.

Claims (1)

[Scope of utility model registration request] A hand switch is provided in one of a pair of power lines leading from a two-phase AC power source to the drive motor, and branches the line in parallel, and a hand switch is provided in one line of a pair of power lines leading from the two-phase AC power source to the drive motor. An upper limit is provided in each branch circuit leading to one end of the forward/reverse coil and in each corresponding branch circuit, and opens when the shutter curtain reaches the upper limit position or lower limit position to cut off power supply to the drive motor. The shutter curtain is equipped with limit switches for the upper limit and lower limit, and a phase advance capacitor connected between the line connecting the limit switches of both branch lines and the forward/reverse coil. In an electric shutter configured to move up and down to a predetermined upper limit position or lower limit position opened by a limit switch, a circuit to which a phase advance capacitor of one of the branch circuits is connected. and the other power supply line leading from the AC power supply to the other end of each forward/reverse coil of the drive motor, having a current limiting impedance sufficiently large to the extent that the impedance of the phase advancing capacitor can be ignored. A light emitting element is interposed so that the light emitting element lights up when the front switch is switched to a branch circuit for either forward rotation or reverse rotation, and the limit switch on the switched side is closed; A limit switch confirmation display device for an electric shutter, characterized in that the light is turned off when the limit switch is open so that opening/closing operation of the limit switch can be confirmed.