JPS5938686B2 - Limit switch for shutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a limit switch for a shutter, and in particular, several discs integrally equipped with gears with different numbers of teeth are coaxially fitted and arranged side by side, and each gear integral with the disc is The input shaft connected to the shutter take-up shaft meshes with a gear inserted through a torque limiter, and the rotation of the input shaft is transmitted to the discs, and this rotation causes the discs to rotate at different rotational speeds. When the thin holes drilled on the same circumferential surface of several disks placed side by side coincide with each other, the light emitted from the light emitting part in the dark box will be transmitted through the pores drilled in the disk of the bottom plate. The light is received by a light receiving part corresponding to the light emitting part through the light emitting part, and a contact in the detecting part is actuated to control the shutter at the upper limit or lower limit position.

The limit switch used in conventional shutters uses a screw mechanism transmitted from the shutter take-up drum or electric motor to move a cam body screwed onto the screw to the upper and lower limit positions of the shutter to suppress the microswitch. The position of the microswitch is set in advance, the shutter is repeatedly operated within a predetermined range, and the microswitch is moved little by little to adjust the shutter 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 it is also difficult to make accurate adjustments.

In addition, when moving the cam body to activate the microswitch, the shutter does not stop at a fixed position due to variations in the operating position of the cam body actuating part, and when winding, the disadvantage is that overload occurs such as pushing up the magsa part. There is.

Therefore, the present invention was made to solve this drawback, namely, to make the setting of the control position accurate by using light passing through the pores, to easily perform the adjustment, and to simplify the structure. This is what I did.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shutter limit switch according to the present invention will be specifically described below with reference to the drawings.

Reference numeral 1 denotes a case main body which serves as a dark room, and a shaft 3 is horizontally suspended in the dark room of the main body 1, and a plurality of discs 2a, 2b are mounted on this shaft 3.
, 2C are fitted and supported side by side.

Further, gears 4a, 4b, 4c having different numbers of teeth are integrally provided on the side surfaces of each disc 2a, 2b, 2c, and
a, 2b, and 2c each have −
Narrow through holes 5a, 5b, and 5c are drilled in several places, and the wall of the dark room of the case main body at the position where the through holes sa, sb, and sC drilled in each of these discs 2a, 2b, and 2c coincide with the light from the light passed through the power source. A light emitting section 6, this light emitting section 6 and discs 2a, 2
A light receiving section 7 is provided at an opposing position with 2C and 2C in between, and this light receiving section 7 is linked to a detecting section 8, so that when light is received, a contact 9 is activated to control the shutter.

In addition, the gears 4a, 4b, and 4c provided on each of the disks include a gear 12a fitted to an input shaft 10 horizontally supported in the dark room of the case body 1 via a torque limiter 11 such as a friction plate.
12b and 12c are interlocked.

Further, the input shaft 10 has one end projected outside the case body 1 and is connected to the shutter take-up shaft.

Therefore, the rotation of the input shaft 10 by the shutter winding shaft is controlled by the gear 12a via the torque limiter 11.

12b and 12c, and further gears 4a and 4b.

4c to the discs 2a, 2b, 2c, and the discs 2a, 2
b and 2c are made to rotate at different rotational speeds.

Each disk is provided with a protrusion 13 on its outer periphery for setting the initial upper or lower limit position of the shutter, and when the protrusions 13 are aligned, the thin through hole 5 a t 5 of the disk
b t 5 c is placed on the line connecting the light emitting section 6 and the light receiving section 7 .

Also, a stopper 1 pivotally supported on the main body corresponds to each protrusion 13.
4, the claw 14' of the stopper 14 touches the protrusion to adjust the initial position setting.

Although the drawings illustrate the control of one circuit, since the shutter normally has two circuits for dust control and lower limit control, two of these circuits are used in combination.

The present invention has the above-mentioned configuration. First, in order to set the lower limit switch of the shutter at the position where the shutter is lowered, press the "up button" of the shutter operation push button (not shown) to the position where the shutter slat is no longer slack. That is, roll up the shutter slat until the lowest end touches the floor and press the "stop button" to stop the shutter.

In this state, when the input shaft 10 of the limit switch is turned to the left by hand, the gears 122 to 12C rotate, the disks 2a to 2c rotate, and when this rotation occurs, the protrusion 13 of one of the three disks rotates. is blocked by the claw 14' of the stopper 14 and becomes immobile,
Furthermore, this symmetrical gear that becomes immobile slips on the input shaft 10 due to the action of the torque limiter 11, so that any one of the gears 12a to 12C becomes immobile.

Then, the second and third discs become immobile as well.

At this fixed position, the pores formed in the disks 2a to 2c are aligned, and the lower limit switch is set.

Next, to set the upper limit switch, press the "Rise push button" and when the bottom of the shutter slat reaches a position close to the magsa, operate the "Stop button" to stop the shutter.

In the same way as the lower limit switch setting above, input shaft 10
is turned clockwise to rotate the discs 2a to 2c using the stopper claw 14 to align the pores 5a to 5c in a straight line, completing the setting of the upper limit switch.

When the shutter is lowered by pressing the down button, the holes in the upper limit switch are shifted from each other, and in the lower limit switch, when the shutter reaches the lowest position, the holes 5a to 5c are aligned, and the light from the light emitting part is received by the light receiving part and the detecting part. automatically controls the shutter.

On the other hand, when you press the up button to reach the highest position, the upper limit switch is automatically activated to control and stop the shutter.

As described above, in the present invention, a plurality of discs 2a to 2c integrally equipped with gears 4a to 4c having different numbers of teeth are supported by the same shaft 3 in parallel in a dark room of a case body, and each of the gears is Gears 122 to 12C are horizontally supported in the case body, have one end protruding from the case body, and are fitted into the input shaft 10 connected to the shutter take-up shaft via a torque limiter.
are configured to mesh with each other to transmit the rotation of the input shaft 10 to the discs, and each disc is further provided with thin through holes 5a to 5c at respective locations on the same radial plane centered on the shaft 3, The thin through holes 5a to 5c are aligned by a protrusion 13 provided on the outer periphery and a stopper 14 opposed to the protrusion 13, and the light emitting part 6 and the light receiving part 7 are positioned opposite to the inner wall of the case body on this matched line, This is a shutter limit switch in which the light from the light emitting part is received by the light receiving part I, and the contact of the shutter circuit is actuated by the detection part. Only when a coincidence occurs during rotation, the light receiving part I receives the light and activates the contact to control the shutter at the upper or lower limit position.The configuration is simple, and the limit switch can be set using the torque IJ Mitsuter. Furthermore, the protrusion provided on the outer periphery of each disc and the stopper 14 provided opposite the protrusion make it easy to set the input shaft by turning it once, making it easy to adjust settings even in tight spaces, and even by one person. It is convenient to set.

Furthermore, since light passes through the narrow perforation and is received by the light receiving section, the upper limit or lower limit setting position is accurate with almost no error.

[Brief Description of the Drawings] The drawings show one embodiment of a limit switch for a shutter according to the present invention, and FIG. 1 is a longitudinal cross-sectional side view of one circuit;
FIG. 2 is a longitudinal sectional front view taken along line A-X in FIG. 1. 1...Case body, 2a, 2b, 2C...
... Disk, 3,,,,,, Axis, 4a, 4b, 4c
m...gear, 5a, 5b. 5C...Through hole, 6...Light emitting part, 7...
...Light receiving section, 8...Detection section, 9...
・Contact, 10...Input shaft, 111. ...Torque limiter-112a, 12b, 12c...
...Gear, 13...Protrusion, 14...Stopper, 14/-...Claw.

Claims (1)

[Claims] 1. A plurality of discs integrally equipped with gears with different numbers of teeth are arranged in parallel in the dark room of the case body and are fitted and supported on the same shaft, and the gears are fitted into each of the gears and the input shaft via a dowel lock, respectively. In addition, the input shaft has one end protruding from the case body and is horizontally mounted to transmit the shutter operation, and each of the discs has a light source at one location on the same radius surface centered on the shaft. A thin through hole is drilled through it, and a protrusion is provided on the outer periphery.
A stopper that prevents rotation at the position where the through holes are aligned is swingably opposed to the protrusion, and a light emitting unit is further placed on the inner wall of the case body on the line where the through holes are aligned, at an opposing position with a disk in between. A shutter limit switch is provided with a light receiving section, and one of the light receiving sections is connected to a detection section that operates the contacts of the shutter circuit.