JPH0537378Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an opening/closing limit device for an electric shutter, particularly an electric shutter in which the opening/closing device is attached to a take-up support shaft of the shutter.

[Prior Art] In recent years, due to improvements in operability, requests for remote control, etc., electric shutters that use an electric opening/closing device to raise and lower the shutter have become popular.

First, referring to FIG. 2, an electric shutter of the type in which the opening/closing device is attached to a winding support shaft of the shutter will be briefly described.

A winding support shaft 1 is installed parallel to the lintel of the entrance and exit, and the support shaft 1 has wheels 2,
3 and 4 are rotatably provided, and the wheels 2,
The auxiliary bar 5 passes through the wheels 2, 3,
4 are designed to rotate together. Further, the upper end of the shutter 6 is fixed to the wheels 2, 3, 4, and torsion coil springs 7, 7 for weight balance of the shutter 6 are provided between the wheels 2, 4 at both ends and the support shaft 1. There is.

An electric opening/closing device 8 is mounted parallel to the support shaft 1. A pinion 10 driven by a motor 9 meshes with an internally toothed ring gear (not shown), and the internally toothed ring gear engages with the wheel 3.
is engaged with.

When the pinion 10 is driven and rotated by the motor 9, the wheels 2,
3 and 4 rotate, and the shutter 6 is hoisted or lowered.

Next, in the electric opening/closing device, the power supply to the opening/closing device is cut off at the lower limit or upper limit of the shutter 6, and a limit switch is provided to obtain this cutoff signal.

Conventional limit switches include the following.

The screw shaft is rotated by the movement of the motor 9 described above, and the slider screwed onto the screw shaft is moved in the direction of the screw shaft axis in accordance with the amount of rotation of the motor, that is, the opening degree of the shutter. The upper and lower limit positions of the slider are detected by two microswitches, or the lower limit is detected in the same manner as in the above example, and the upper limit is detected by the output from the rotation detector attached to the motor.
Alternatively, it is electrically detected such as monitoring the current flowing through the motor, and the upper and lower limit positions are detected using two microswitches, which can be adjusted by moving the position of the microswitch with an actuator such as a motor. There are some that allow you to remotely control the shutter while checking its status.

[Problems to be Solved by the Invention] However, when the shutter is wound up, the shutter 6 wraps around the support shaft 1, so the opening/closing device is hidden behind the shutter 6, making it impossible to adjust the position of micro-switches, etc.

For this reason, in the conventional example shown in the first example, the lower limit micro switch position is adjusted while observing the shutter condition, but the upper limit micro switch position is adjusted by eye, and the shutter is raised and lowered several times. Each time, slight corrections were made for final alignment, which resulted in very poor workability and poor setting accuracy.

Furthermore, although the conventional examples shown in the second and third examples solve the inconvenience of adjusting the upper limit microswitch, they have the problem of complicating the electric circuit and detection mechanism and increasing costs.

This idea was created in view of the actual situation,
It is an object of the present invention to provide an opening/closing limit device for an electric shutter which has a simple mechanism and allows easy setting of upper and lower limits.

[Means for Solving the Problems] The present invention has a screw shaft that is rotated by the rotation of a motor of a switchgear, and a slider that operates a micro switch is screwed onto the screw shaft, and the slider is slidable in parallel with the screw shaft. The present invention is characterized in that a slide gauge that can be engaged only in the upper limit direction of the slider is provided so that at least the upper limit microswitch, the lower limit microswitch, and the upper limit microswitch can be adjusted.

[Operation] Adjust the micro switch for the lower limit while watching the shutter being lowered to the lower limit, and adjust the micro switch for the upper limit by winding the shutter once to the upper limit and lowering it again to the lower limit, then align it to the position indicated by the slide gauge. to fix the upper limit micro switch.

[Example] An example of the present invention will be described below based on the drawings.

A screw shaft 13 is rotatably attached to the substrate 11 via bearings 12, 12, and a slider 14 is screwed onto the screw shaft 13. The slider 14 is provided with a rotation stopper mechanism (not shown), so that the slider 14 moves in the axial direction as the screw shaft 13 rotates. A gear 15 is fitted to one end of the screw shaft 13, and the rotation of the motor 9 is transmitted to the gear 15.

A gauge slide shaft 16 is provided parallel to the screw shaft 13, and a slide gauge 17 is fitted onto the gauge slide shaft 16 so as to slide with a required resistance.
7 and the slider 14 are brought into contact with each other only when the slider 14 moves in accordance with the opening direction of the shutter 6.

The lower limit micro switch 18 has its actuator 18a in contact with the slider 6 at the shutter lower limit position of the slider 14, and the upper limit micro switch 19 is attached to a support piece 20, which is connected to the screw shaft 13. It is designed to be fixed with screws 22 into slit holes 21 drilled in parallel in the substrate 11. Note that 23 in the figure is a slider set screw.

Next, the work of adjusting the mounting positions of the micro switches 18 and 19 will be explained.

The upper limit microswitch 19 is fixed at the extreme end (the right end in FIG. 1), and the opening/closing device is operated to lower the shutter 6 to the lower limit position. When the shutter 6 is lowered to the lower limit position, the opening/closing limit device is exposed and the actuator 18
The position of the lower limit micro switch 18 or the slider 14 is adjusted so that a touches the slider 14 and the lower limit micro switch 18 is operated by the slider 14. Also, at this time, move the slide gauge 17 to the left.

The upper limit micro switch 19 is set to wind the shutter 6 to the upper limit and then lower it to the lower limit.

By winding the shutter 6 to the upper limit, the slider 14 moves the slide gauge 17 to the slider 14.
Even if the shutter 6 is moved to the upper limit position and the shutter 6 is lowered to the lower limit, the slide gauge 17 remains at the upper limit position. Therefore, by positioning the upper limit micro switch 19 in accordance with the position of the slide gauge 17 and fixing the support piece 20 with the screw 22, the adjustment of the upper limit micro switch 19 is completed simply and accurately.

The lower limit microswitch 18 may also be attached to the substrate 11 via the support piece 20, and the upper limit microswitch 19 may be attached directly to the substrate 11 without using the support piece 20. However, in this case,
The upper limit microswitch mounting hole formed in the substrate 11 is made into a long hole extending in the axial direction of the screw shaft so that the position of the upper limit microswitch 19 can be adjusted. Furthermore, the guide mechanism of the slide gauge is not based on the gauge slide shaft, but may be such that, for example, a slit hole is provided in the base plate parallel to the screw shaft, and the slide gauge is slidably fitted into the slit hole.

[Effects of the Invention] As described above, the present invention has an excellent effect in that the structure is extremely simple and the position adjustment work of the upper limit and lower limit microswitches is extremely easy.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of one embodiment of the present invention;
The figure is a perspective view showing an example of an electric opening/closing device. Reference numeral 8 indicates an opening/closing device, 9 a motor, 13 a screw shaft, 14 a slider, 17 a slide gauge, 18 a lower limit microswitch, and 19 an upper limit microswitch.

Claims (1)

[Scope of utility model registration request] Applicable only when a slider for operating a micro switch is screwed onto a screw shaft rotated by the rotation of a motor of a switchgear, and is slidable parallel to the screw shaft and in the direction of the upper limit of the slider. An opening/closing limit device for an electric shutter, characterized in that a slide gauge that can be engaged with a slider is provided, and the position of at least an upper limit micro switch for an upper limit, a lower limit, and at least an upper limit can be adjusted.