JPS5939396Y2 - limit switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a limit switch for shutters that allows easy setting operations.

The limit switch conventionally used for shutters is a screw mechanism transmitted from the shutter take-up drum or electric motor, which moves a cam body screwed onto the screw to the upper and lower limit positions of the shutter and presses the micro switch. The position of the microswitch is set in advance, the shutter is repeatedly operated within a predetermined range, and the microswitch is moved and adjusted to match the upper and lower limit positions.

Therefore, with this method, it is very difficult to set the position because you have to put your face and hands through the inspection opening of the shutter case in the ceiling and work in a narrow position, and there are also difficulties in adjustment.

Furthermore, in order to operate a microswitch using a part of the cam body that rotates in conjunction with the shutter drive shaft, the rotation from the drive shaft must be decelerated to increase the ratio.

Further, the position at which the actuating portion of the concave or convex portion of the cam body operates the microswitch changes depending on the mounting position of the cam body or the microswitch.

That is, 1 to 2 mm at the cam position corresponds to 1 to 2 shutter slats when calculated from the reduction ratio.

Therefore, the settings for the cam body are delicate. For example, even a slight deviation in the setting of this cam body may cause a delay in stopping when the shutter is stopped at the upper limit position, causing a major accident such as the seat plate at the bottom of the shutter being pushed up against the magnifying glass on the ceiling, or causing frequent accidents. It may become overloaded.

Further, since the cam body is set in a relatively narrow space such as in the ceiling, taking the above points into account, it is difficult and difficult to set the cam body in an accurate position.

In order to solve these conventional drawbacks, the present invention has a pair of gears that have a recess in a certain part on the outer circumferential surface and integrally have a gear with a different number of teeth by one or two on the side surface. When discs with the same diameter are supported by the same shaft and the rotation from the shutter drive shaft is transmitted to each disc through an idle gear, the gears on the pair of discs have different numbers of teeth, so they rotate while rotating. The recesses provided on the plate will shift slightly by the difference in the number of teeth, and if you first align the recesses of both discs and insert a microswitch that spans the discs into both recesses, the rotation will shift slightly due to rotation, and the switch The closed state continues, and when the recess is further reversed, the recesses align again and the microswitch is fitted and closed.

Therefore, setting the microswitch is easy by first aligning the recesses and fitting it in. Also, since a part of the disc is exposed from the box, all you have to do is turn the disc with your fingers and align the recesses, making it accurate even in tight spaces. The present invention provides a limit switch that can set a precise stop position.

Hereinafter, the limit switch according to the present invention will be specifically explained in terms of dimensions.

1 and 2 are circles and plates with the same diameter, and the disks 1 and 2 are provided with recesses 3 and 4 at certain locations on their peripheral surfaces, respectively.

Also, on the side surfaces of the discs 1 and 2, gears 5 and 6 each having a different number of teeth are provided.
are mounted or molded in one piece, and the discs 1, 2 are supported by a shaft 7.

The respective gears 5 and 6 have idle gears 11 and 12 between them and gears 9 and 10 having different numbers of gears mounted on the drive shaft 8.
The rotation of the drive shaft 8 is transmitted to the disks 1 and 2 through the idle gears 11 and 12, respectively.

The idle gears 11 and 12 are pivoted 15 to one end of an L-folding bowl 14 whose bent portion is pivoted 13, and the end of an operating lever 16 is connected to the other end of the L-folding bowl 14 by a pin 17. Further, a tension spring 18 is biased on the operating lever 16 side of the arm 14, and the idle gear 11-12 is connected to the gears 9 and 10 on the drive shaft 8 side and the gear on the disk 1-2 side. 5 and 6 so that they are always anastocating each other.

Further, on the circumferential surfaces of the discs 1 and 2, there are correspondingly provided microswitches 19 and operating arms 20 that straddle the discs 1 and 2.
A trochanter 21 provided at the tip of the disk is positioned so that the trochanter 21 rolls along the circumferential surfaces of both the disks 1 and 2.

Moreover, the actuating arm 20 is always urged by a spring so as to push the circumference of the disks 1 and 2 via the trochanter 21.

Therefore, only when the discs 1 and 2 rotate and the recesses 3 and 4 provided on the discs 1 and 12 coincide, the trochanter 21 fits into the recesses 3 and 4, thereby breaking the circuit.

22 A case housing a limit switch mechanism, with parts of the discs 1 and 2 exposed through the cutout 22' of the case 22', and an end of the operating lever 16 also protruding from the case 22. By pressing the end of the operating lever 16, the idle gears 11 and 12 are released from mesh.

Further, in this released state, the position can be easily set by rotating the exposed portion exposed from the notch 22' with a finger.

The present invention has the above-mentioned structure. To explain this operation, the case 22 also pushes the end of the operating lever 16 protruding from the idle gears 11 and 12 to disengage the idle gears 11 and 12. Turn each exposed part exposed from the casing 22 with your fingers to set the position by aligning the concave parts 3 and 4 in advance, then mesh the idle gear with the gear, and rotate the drive shaft 80 rotations. 11. Gears 5, 6 integrated with the disc via 12
to rotate the integrated discs 1 and 2.

At this time, since the integral gears 5 and 6 provided on the disc 1゜2 have different numbers of teeth, the rotation of the disc with the gear with the larger number of teeth is delayed by the difference in the number of teeth, and the position of the recesses 3 and 4 is delayed. Only when the recesses 3 and 4 of the discs 1 and 2 are aligned, the trochanter 21 that rolls along the circumference of the disc 1.2 fits into the recesses 3 and 4, and the actuating arm 20 This actuates the microswitch 19 to cut off the electrical circuit connected to the motor.

That is, the motor stops rotating. Next, the case where the present invention is used for opening and closing a shutter, for example, will be explained.

To open and close the shutter, it is necessary to set the fully open and fully closed positions of the shutter, that is, the upper and lower limits, so two limit switches are used as shown in Figure 3, and the shaft 7
is one common shaft, and both gears 9, 10, 9, 10 are set on the common drive shaft 8.

For example, the limit switch on the left in the figure is used only for grudges, that is, it turns off the power only when the shutter is fully closed, and the limit switch on the right is used only for the upper limit, that is, it turns off the power only when the shutter is fully opened.

First, when the installation of the shutter is completed, the shutter is in the fully closed position.

Now we will set the limit switches to stop the shutter at the bottom and top.

To set the fully closed position of the shutter, that is, the lower limit position, use the left limit switch as follows.

l) First, press the ``Rise'' button on the shutter, and when the shutter slats are rolled up until there is no slack and the bottom edge is just in contact with the floor, press the ``Stop'' button.

The shutter power is turned off.

2) Push the operating lever 16, which is also exposed on the limit switch casing 22, against the spring 18 (Fig. 2). 3) The L-shaped bowl 14 is connected to the idle gear 12 by using the support shaft 13 as the pivot. 15 to the lower right in the figure and gear 5.
6 is disengaged from the drive shaft and becomes free, allowing disks 1 and 2 to be rotated separately.

4) In this state, rotate the disc 1 ridge exposed from the notch 22' of the case 22 with your fingers, and stop when the recess 3 is exposed.

5) Next, turn the protrusion of the disc 2 with your fingers, and when the recess 4 comes into view, match 3 and 4 to the same position, and turn the discs 1 and 2 together with your fingers, and the limit switch trochanter 21 , the trochanter 21 enters the recess 3.4 under the force of the spring.

At this time, you will hear the sound of the limit switch operating, so you can check it even if you cannot see it.

6) Then, when you release the operating lever 16, the idle gear 1
1 and 12 return to their original positions due to spring force, driving shaft 8 and disk 1
, 2 (gear 5.6) are linked.

From now on, the shutter rise button will be pressed and the shutter will rise, but since the number of teeth of gears 5 and 6 is different, the rotational speed of the disc 1 and 2 is different, and the recess 3,
4 causes a positional shift, the limit switch trochanter 21 is pushed out to the circumference of the disk, and the power source becomes O■.

Therefore, later on, numbers 3 and 4 will not match until the shutter comes down and reaches the lowest position (there is no need to worry about reaching the least common multiple of the number of two gears at a distance of about the height of the general shutter), so only at this time will the power be turned on. The shutter stops.

Next, set the fully open position of the shutter, that is, the upper limit position, using the limit switch on the right side as follows: l) Press the rise button by hand, and the seat plate at the lowest position of the shutter slat is placed in the magsa. time (predetermined shutter fully open position),
Press the stop button to stop the motor.

2) Push the operating lever 16 of the limit switch on the right side, which is different from the limit switch used to set the lower limit, remove the idle gear in the same way as described above, and remove the idle gear from the notch 22' of the casing 22.
3) Turn the disks 1.2 at the same time and stop at the position where the trochanter 21 is inserted, 4) Turn the operating lever. 16 to return it and set the idle gear, the stop position at the upper limit position is completed.

Therefore, by arranging the limit switch mechanisms in two rows, one for the upper limit and the other for the lower limit, you can easily exhibit it by simply removing the idle gear and aligning the recesses as described above, and setting the lower limit motor cutoff position. can.

Therefore, the conventional complicated troubles can be eliminated and the desired position can be easily set.

As mentioned above, in the present invention, gears 5 and 6 having different numbers of teeth are provided integrally with the disks 1 and 2 having the same diameter, and the concave portions provided in some parts of the disks are aligned in advance and rotated. , due to rotational deviation due to the difference in the number of teeth provided on this disc, the positions of the recesses 3 and 4 provided on the discs 1 and 2 are shifted, with this pair of discs on the upper limit side and the other pair on the lower limit side. , when the shutter goes up and the concave part on the upper limit side coincides, it operates a microswitch placed opposite the circumferential surface of the disc, and when the shutter goes down and the concave part on the lower limit side coincides, it operates a microswitch. , the microswitch operates and stops the drive, but in this case the number of teeth is slightly different, so within the range of vertical movement of the shutter, the recesses will never overlap except at the set point.

Therefore, the upper and lower shutter stop positions can be set by a simple means of aligning the recesses.

It is also convenient to set the settings because it can be done from outside the casing.

Furthermore, the rotation ratio can be freely adjusted by changing the gear ratio of the drive gear, disk gear, etc.

[Brief explanation of drawings]

The drawings show an embodiment of the limit switch for a shutter according to the present invention, in which Fig. 1 is a longitudinal sectional front view, Fig. 2 is a side view, Fig. 3 is a front view of the limit switch arranged in two rows, and Fig. 4 is a front view. FIG. 2 is a perspective view showing the relationship between the limit switch and the disc. 1.2...Disc, 3,4...Concave, 5,6...Gear, I...Shaft, 8...Drive shaft, 9,10...Gear, 11°12. ...Idle gear, 13...shaft branch,
14... L folding bowl, 15... Pivot support, 16... Operation lever 17... Pin, 18... Spring, 19
...Microsinch, 20...Operating arm, 21...
- Trochanter, 22...casing, 22'...notch.

Claims (2)

[Scope of utility model registration request] (1) Gears of different diameters are integrally supported on the same shaft on the side surfaces of a pair of disks with the same diameter and have a concave portion on the circumference, and the gears are connected to and disengaged from the gears in conjunction with an operating lever. a pair of coaxial idle gears, a pair of gears that are attached to a shutter drive shaft and mesh with the idle gears, and a trochanter that is pressed and rotated across the circumferential surfaces of both discs. and a limit switch casing having a cutout through which one end of the operating lever is exposed and a part of the disc. (2) Utility model registration claim No. 1, characterized in that a pair of limit switches for the single dose and the lower limit of the '/geator are installed facing each other on the same disk shaft and the same drive shaft.
Shutter limit switch described in section.