JPH0734154Y2 - Upper limit position detector for electric shutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an upper limit position detecting device for an electric shutter that opens and closes by forward and reverse driving of a switch.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of electric shutter, an upper limit detection switch is provided to detect when the shutter curtain rises to an upper limit and stop the switch. .
By the way, in this case, when the switch is stopped by the upper limit detection, the weight may be slightly lowered due to the weight of the seat plate and the play of the drive mechanism.

Then, if the upper limit detection switch cuts off only the self-holding circuit in response to the detection that the shutter curtain has reached the upper limit, there is no problem in operation even if it is lowered as described above. , In the case of transferring this stop control state to, for example, a centralized management system, the upper limit detection signal disappears due to the drop after the self-holding circuit is cut off because the upper limit is reached, Therefore, there is a fear that a false alarm signal may be issued, which hinders reliable ascending control.

Moreover, in view of the above-mentioned circumstances, the present invention was devised with the object of providing an upper limit position detection device for an electric shutter that can eliminate these drawbacks. Then, the upper limit position detecting means for detecting that the shutter curtain has reached the upper limit position and outputting the detection signal, a position detecting switch part for detecting the position of the rising shutter curtain, and the position detecting switch part. Starts the timer based on the detection command from, and detects the chattering of the switch contact in the position detection switch and the timer part that outputs the upper limit detection signal after the preset timer time has elapsed, and at the stable stage where chattering is eliminated. And a chattering detection circuit section for outputting a detection command to the timer section side.

The present invention, with this configuration, enables stable upper limit position detection with high accuracy.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, 1 is a shutter curtain of an electric shutter, and the shutter curtain 1 is a shutter case 2
It is wound around the winding wheel 3 provided inside the opening machine 4
The opening and closing operation of the opening portion is performed while being guided by the guide rail 5 by the forward and reverse driving of the above.

The control panel 6 connected to the switch 4 is adapted to output a control command from the switch control section 7, and an output signal from the upper limit output circuit means 8 is output to the control panel 7. As a result, a stop command is issued to the control panel 6. That is, in the embodiment, the upper limit position detection switch 9 for detecting the arbitrarily set upper limit position of the shutter curtain 1 is provided. The detection signal from the upper limit position detection switch 9 is initially used as the chattering detector 10
The signal from the chattering detector 10 is input to the delay circuit means (timer unit) 11. Then, the delay circuit means 11 starts the timer in response to the signal at the stable stage where it is judged that the chattering in which the detection signal of the upper limit detection switch 9 is stabilized has disappeared, and after a predetermined timer time t has elapsed, the delay circuit means 11 is notified to the control section 7. And outputs an upper limit detection signal. However, this timer time t is set to a time sufficient to bring the upper limit position detection switch 9 into a stable upper limit detection state even when the winding wheel 3 is rewound when the upper limit is stopped.

In the embodiment of the present invention configured as described above, when the shutter curtain 1 reaches the upper limit position in the raising control process of raising the closed shutter curtain 1 to open it, the upper limit position detection switch 9 detects the upper limit position. However, after the upper limit position is detected, the upper limit detection signal is output to the control panel 6 with a delay due to the start of the timer. Therefore, after the switch 4 is stopped, even if the winding wheel 3 is slightly unwound due to the weight of the seat plate or the like, the upper limit position detection switch 9 is maintained in the detection state, and thus, as in the conventional case. A problem that the upper limit position detection switch 9 is in a non-detection state and an erroneous report is transferred to the centralized management system is reliably prevented, and highly reliable control can be performed.

In addition, since the delay circuit means 11 starts the timer from the stable stage after the chattering is completed, the operating speed of the switch 4 is changed by, for example, a load change on the switch 4, and the upper limit position detection is performed. Even if the chattering time of the switch 9 fluctuates, a stable upper limit detection signal can be output regardless of this, and the reliability can be further improved.

Further, in the upper limit position adjustment, the upper limit position detection switch 9 is set at an arbitrary position lower than the original upper limit position detection, and the upper limit position is adjusted by adjusting the timer time t of the delay circuit means 11. Therefore, there is also an advantage that the adjustment work is remarkably simplified.

[Advantages] In short, since the present invention is configured as described above, the upper limit position detection signal is detected by the position detection switch unit for a predetermined time after the position detection switch unit detects the position. It will be output after a lapse of time, so even if the winding wheel returns slightly after the upper limit stop signal due to the upper limit position detection signal, the shutter curtain will still be sufficiently wound according to the timer time. As a result, the position detection switch is kept in a non-detection state, and stable and highly reliable upper limit position detection can be performed.

Moreover, this stable and highly reliable upper limit position detection is carried out by starting the delay circuit means with a timer in a stable stage in which the occurrence of chattering at the switch contacts in the position detection switch section has ended. For example, even if the operating speed of the switch changes due to load fluctuations on the switch and the chattering time of the upper limit position detection switch fluctuates, a stable upper limit detection signal can be output regardless of this, and even more. Will improve the reliability of.

[Brief description of drawings]

FIG. 1 shows an embodiment of an upper limit position detecting device for an electric shutter according to the present invention. FIG. 1 is an overall front view of the electric shutter, FIG. 2 is a block circuit diagram, and FIG. 3 is a timing chart. It is a figure. In the figure, 2 is a shutter curtain, 4 is a switch, 6 is a control panel, 7 is a control unit, 9 is a position detection switch, 10 is a chattering detector, and 11 is a delay circuit means.

Claims (1)

[Scope of utility model registration request] 1. An upper limit position detecting means for detecting that the shutter curtain has reached an upper limit position and outputting a detection signal thereof, a position detecting switch portion for detecting the position of the rising shutter curtain, and the position detecting means. The timer is started based on the detection command from the switch unit, and the timer unit that outputs the upper limit detection signal after the preset timer time has elapsed and the chattering of the switch contact in the position detection switch unit are detected, and stable without chattering. And a chattering detection circuit section that outputs a detection command to the timer section side at a stage.