JPH0348819Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a limit switch in which when a controlled object such as a shutter matches an arbitrarily set position, a micro switch is activated and outputs a position signal of the shutter, etc. In particular, the present invention relates to a limit switch that allows the signal output position of the limit switch to be easily and accurately set.

[Prior Art] For example, a limit switch has conventionally been used to detect a preset stop position of a shutter and stop the shutter from moving up and down.

This limit switch has a rotation storage mechanism that is linked to the vertical movement of the shutter, and a cam ring that is linked to the rotation storage mechanism. When the shutter comes to a stop position, the cam wheel operates a micro switch connected to a shutter drive control device to stop the shutter at a predetermined position.

By the way, when adjusting the limit switch to set the shutter stop position, it is necessary to move the shutter up and down to the desired position by pressing a button, and during this time it is necessary to prevent the micro switch from operating. There is. Therefore, conventional limit switches are equipped with a reset mechanism that sets the rotational memory mechanism that stores the position of the controlled object to the origin position, and a mechanism that fixes the microswitch in a constant state. It was operated separately.

[Problems to be solved by the invention] However, when setting the stop position of the shutter, the micro switch is fixed and the shutter is moved by pressing a push button to set the desired limit position, but during this time the rotation memory is not stored. The mechanism continues to rotate. Therefore, after setting the limit position, it is necessary to release the fixation of the microswitch and to reset the rotation storage mechanism to the origin position in a separate operation, which poses the problem that setting the limit position is troublesome. Ta.

In addition, if the rotation storage mechanism is not reset sufficiently, the shutter limit position will shift, which may lead to accidents such as the shutter being rolled in or reversed.

[Purpose of the invention] The present invention was made to solve the above-mentioned problems, and it is possible to reset the rotational memory mechanism that memorizes the position of the controlled object by one-touch operation of one set lever. To provide a limit switch with good positioning accuracy, capable of fixing a micro switch at the same time as fixing a micro switch, and surely and easily setting a limit position of a controlled object.

[Means for Solving the Problems] In order to solve the above problems, the limit switch of the present invention intermittently transmits the rotation of the input shaft to a plurality of discs disposed coaxially through an interlocking mechanism. A cam ring 16a provided in conjunction with the rotation storage mechanism 10a, and an actuator 18 on the outer periphery of the cam ring 16a.
It has a micro switch MSa that opens the switch when the tip of the cam ring 16a comes into contact with the tip and falls into the recess 17a on the outer periphery of the cam ring 16a, and an arm member provided so as to be freely rotatable around the support shaft 19a. a reset mechanism that releases the interlocking mechanism of the disc when the arm member rotates in one direction and simultaneously sets the cam ring 16a and the rotation storage mechanism 10a to the original position; The set lever 28a is freely provided, and the set lever 28a is provided at the base of the set lever 28a in the tilted position.
An engaging portion that is engaged and fixed to the frame of the limit switch is integrally formed, and an arm member forming the reset mechanism is attached to the leg portion of the set lever 28a in the tilted position. Setting arm 3 to be pressed to a position to rotate in the direction
1a and a switch arm 29a that presses the actuator 18a of the microswitch MSa in the direction in which the switch is closed, each of which is integrally formed with a set lever 28a.

[Effect]

Next, the operation when the above-mentioned limit switch is used to set the opening/closing stop position of the electric hoisting shutter will be explained.

First, as shown in FIG.
8a is pushed and then tilted to engage and fix the engaging portion to the frame 3 of the limit switch. Then, the setting arm 31a portion of the set lever 28a rotates the arm members of the reset mechanism (in the illustrated embodiment, the set arm 20a and the support bracket 22a) in one direction, and returns the cam ring 16a and the rotation storage mechanism 10a to the original position. setting and canceling the interlocking mechanism. At the same time, the set lever 28
The switch arm 29a of a is a micro switch.
The actuator 18a of MSa is pressed to operate the micro switch MSa and close the control circuit of the shutter hoisting motor.

In this state, press the lift button on the shutter separately to drive the hoisting motor in forward and reverse rotation.
Place the slat curtain in the highest position (open position) or lowest position (closed position). Here, when the set lever 28a is released from the engagement and fixed and returned to its original position, the opening/closing position of the slat curtain is changed to the rotation storage mechanism 1.
0a will be stored as the origin position.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows a limit switch device 1 that is integrally constructed by combining two limit switches of the present invention, and among the component parts of each limit switch A and B, an input shaft 2 and a frame body 3, which will be described later, are common. There is.

In the figure, 3 is a frame common to limit switches A and B. An input shaft 2 common to limit switches A and B is rotatably provided in the center of the frame 3. Both ends of the input shaft 2 are connected to the frame 3
It protrudes outward, and is configured so that the rotational output of an external device can be input from either side. A drive gear 4a is fixed to the right side of the input shaft 2 within the frame 3.

Further, the input shaft 2 is provided on one side of the frame 3.
A rotating disk shaft 5a is fixed to the frame 3 in parallel with the input shaft 2 diagonally above. A driven gear 6a is rotatably attached to the right side of the rotating disk shaft 5a, and the driven gear 6a is configured not to slide along the rotating disk shaft 5a. The driven gear 6a meshes with the drive gear 4a.

A large-diameter motion gear 7a is fixed to one end surface of the driven gear 6a, and is configured to rotate around a rotating disc shaft 5a together with the rotation of the driven gear 6a. Further, next to the motion gear 7a, a first disc 8a and a second disc 9a are spaced apart from each other by a predetermined distance in the axial direction so as to be rotatable with respect to the rotating disc shaft 5a. is fixed and installed. Then, the pinion 26 described later
The motion gear 7a, the first disc 8a, and the second disc 9a are configured to interlock as a rotation storage mechanism 10a in the limit switch A via interlocking mechanisms such as a and 27a.

A tooth 1 is provided on the half of the first disc 8a on the side of the motion gear 7a.
1a is formed around the entire circumference and is configured to mesh with a pinion 26a rotated by a motion gear 7a. Further, a heart-shaped set cam 12a is provided on the end surface of the first disc 8a on the motion gear 7a side.
are coaxially fixed, and one two-toothed tooth 13a is provided near the outer periphery on the end surface on the second disk 9a side.

The second disc 9a has teeth 1 on the side half of the first disc 8a.
4a, and is configured to mesh with a pinion 27a which is intermittently rotated by the two teeth 13a. Further, a heart-shaped set cam 15a is coaxially fixed to the end surface of the second disc 9a on the first disc 8a side, facing in the same direction as the set cam 12a of the first disc 8a. A cam ring 16a is provided on the other end surface of the second disc 9a, and is configured to rotate together with the second disc 9a around the rotating disc shaft 5a.

The cam ring 16a is a perfectly circular cam whose center is inserted through the rotating disk shaft 5a, and has a recess 1 at one location on the outer circumferential surface.
7a is formed. A micro switch MSa is provided on the side of the cam ring 16a.
Micro switch MSa actuator 18a
is engaged with the outer peripheral surface of the cam ring 16a, and the micro switch MSa is configured to be opened only when the actuator 18a falls into the recess 17a. Then, the set cam 1
2a, 15a and a set arm 20a, which will be described later.
When the rotation storage mechanism 10a is set to the origin position by the rotation storage mechanism 20a, the recess 17a of the cam ring 16a
, actuator 1 of the micro switch MSa
8a drops and micro switch MSa turns OFF
It is configured so that.

Next, a support shaft 1 is placed next to the rotating disc shaft 5a.
9a is fixed to the frame 3 parallel to the rotating disk shaft 5a. The support shaft 19a has a convex portion 21a at the tip.
Two set arms 20a, 20a having a set cam 12 are swingably provided.
Together with a and 15a, it constitutes a reset mechanism for the rotational storage mechanism 10a. Both set arms 20a,
At the support side end of 20a, both ends of a substantially U-shaped support bracket 22a are connected to the set arms 20a, 2.
The set arms 20a, 20a are each fixed perpendicularly to the longitudinal direction of the set arm 0a, and both set arms 20a, 20a are configured to be able to swing together around a support shaft 19a. Furthermore, a pair of mounting plates 23a are provided on the upper part of the support bracket 22a to protrude in parallel with the set arm 20a.
A pinion shaft 24a is provided between 3a and 23a. The pinion shaft 24a has one end 2
5a protrudes outward from the mounting plate 23a.
Further, pinions 26a and 27a are provided between the mounting plates 23a and 23a to be rotatable and fixed in the axial direction as an interlocking mechanism for the rotation storage mechanism 10a. Although not shown, the pinion shaft 24a is pressed toward the rotating disk shaft 5a by a biasing member such as a spring. Therefore, normally, as shown in FIG. 1, the pinion 26a is engaged with the motion gear 7a and the teeth 11a of the first disc 8a, and the pinion 27a is engaged with the tooth 11a of the first disc 8a.
2 of the first disk 8a when set at the origin position
It is meshed with the tooth 13a and the tooth 14a of the second disc 9a.

Next, next to the cam ring 16a, the rotary disk shaft 5
A set lever 28a is provided above a.

FIG. 3A is a diagram showing the state of the set lever 28a when the limit switch is used (normally). The lower part of the set lever 28a is divided into two parts with the rotary disk shaft 5a in between, and the limb closer to the micro switch MSa is slightly curved inward and extends downward to connect the switch arm 2.
It is said to be 9a. An operation plate 30a is provided at the tip of the switch arm 29a at right angles to the direction of the cam ring 16a, and faces the actuator 18a of the microswitch MSa. On the other hand, with respect to the rotating disc shaft 5a, a setting arm 31a is horizontally provided on the side of the set lever 28a opposite to the switch arm 29a, and is in contact with the end 25a of the pinion shaft 24a from above. .

Further, an upper portion of the set lever 28a projects outward from a lever hole 3a provided in the frame 3, and the set lever 28a is slidable up and down with respect to the frame 1. A locking groove 32a serving as a locking structure is formed on the side of the protruding set lever 28a on the setting arm 31a side, and the lower side of the locking groove 32a is formed slightly obliquely. Then, when the set lever 28a is pressed down to the set position, the pinion shaft 24a slides on the lower end surface of the setting arm 31a, and the support shaft 19
The set arms 20a, 20a are swung about the support shaft 19a in a direction away from the rotary disk shaft 5a, and the set cam 1 is swung about the support shaft 19a.
2a and 15a are configured to be set at the origin position. Furthermore, if the set lever 28a is swung leftward from this set position around the contact point between the pinion shaft 24a and the setting arm 31a,
The operation plate 30a of the switch arm 29a presses the actuator 18a of the micro switch MSa,
The microswitch MSa is turned on, and this state can be fixed by locking the locking groove 32a to the frame 3.

Next, as shown in FIG. 1, limit switch B connects input shaft 2 and frame 3 to limit switch A.
It is a common component with the limit switch A, and is provided at a position opposite to the limit switch A across the common input shaft 2. The limit switch B is the rotation storage mechanism 10b.
The configuration is the same as limit switch A, except that the rotating direction of limit switch A is opposite to that of limit switch A.
The same numbers will be used instead of , and the explanation will be omitted.

Next, a configuration in which the limit switch described above is used as an automatic stop switch for a wind-up shutter will be described.

The hoisting shutter is connected to a motor that is connected to a drive control device. The drive control device has an open drive circuit and a close drive circuit connected in parallel to each other, and by operating the open button, close button, and stop button provided in both circuits, the shutter S can be driven up and down.

The rotation of the drive shaft of the shutter S is configured to be input to the other end of the input shaft 2 common to the limit switches A and B. here,
As shown in FIG. 3, when the shutter S moves in the opening direction, the cam ring 16a of the limit switch A is
The direction of rotation is the opposite direction (arrow C in the figure),
The direction in which the cam ring 16b of the limit switch B rotates will be referred to as the forward direction (arrow D in the figure).

The microswitch MSa of the limit switch A is connected in series to the open drive circuit of the drive control device of the shutter S, and the microswitch MSb of the limit switch B is connected in series to the same close drive circuit.

Next, the operation of the configuration described above will be explained in accordance with the procedure for setting the upper limit position and lower limit position of the shutter S to both limit switches A and B.

First, set lever 28 of limit switch A.
Press a downward and move it to the set position. At this time, as shown in FIGS. 3A to 3C, the pinion shaft 24a swings to the left around the support shaft 19a while sliding along the lower end surface of the setting arm 31a. 26a, 27a
The motion gear 7a, the first disc 8a, and the second disc 9
It is separated from a and set at a position away from them. Therefore, in this state, even if the input shaft 2 rotates, the driven gear 6a only rotates, and no rotational force is transmitted to the first disc 8a and the second disc 9a.

In addition, the reset mechanism operates together with the rocking of the pinion shaft 24a to reset the rotation storage mechanism 10a. That is, the set arms 20a, 20a
is swung upward, and the set arms 20a, 20a
The convex portions 21a, 21a of the set cams 12a, 15
a, the set cams 12a, 15a
Rotate. When the set lever 28a is pushed to the set position, as shown in FIG.
a, 21a are engaged with the recesses of the set cams 12a, 15a, and the first disc 8a and the second disc 9a
is set at the origin position. At this time, cam wheel 1
The recess 17a of the microswitch 6a is on the right side, and the actuator 18a of the microswitch MSa is depressed into the recess 17a.
MSa is in the OFF state. (This state is called a set state.) Here, as shown in FIG.
Tilt it to the left with the contact point as the center of rotation, and insert it into the locking groove 3.
2a is engaged with the edge of the lever hole 3a.

At this time, since the pinion shaft 24a does not change its position and therefore the set arm 20a does not move, the rotation storage mechanism 10a is fixed at the original position.

On the other hand, by tilting the set lever 28a to the left, the switch arm 29a moves to the right, so the operation plate 30a presses the actuator 18a that has fallen into the recess 17a, turning the micro switch MSa into the ON state. Fix it. (This state is called a locked state) Next, according to the above procedure, limit switch B is also fixed in the locked state.

Through the above operations, the shutter S can be freely driven up and down by operating the open button, close button, and stop button of the drive control device.

In the above state, the shutter S is moved to the upper limit position by operating the open button. At this point, return the set lever 28a of limit switch A to the right to release the fixation. Pinions 26a, 27
Since the cam wheel 16a is again operatively connected to the motion gear 7a, the first disk 8a, and the second disk 9a, the cam wheel 16a
comes to move in conjunction with the rotation of the drive shaft of the shutter S.

Next, by operating the close button, the shutter S is lowered and moved to the lower limit position. at this point
Similarly to limit switch A, the set lever 28a of limit switch B is unlocked.

Note that the limit positions may be set in the reverse order of the above-mentioned order.

Next, the operation of the limit switch whose upper limit position and lower limit position are set as described above will be explained.

First, press the open button to move the shutter S upward from the lower limit position. The input shaft 2 starts rotating in synchronization with the rotation of the drive shaft, and the rotation storage mechanism 10b of the limit switch B starts normal rotation from the original position. That is, when the first disc 8b rotates once, the two teeth 13b return to rotate the pinion 27b by one tooth. Then, the second disc 9b that meshes with the pinion 27b also rotates by one tooth, and the cam wheel 16
b is rotated in the forward direction D by a predetermined angle. During this time, the micro switch MSb remains fixed in the ON state, and thereafter the rotation of the input shaft 2 is controlled by the disc 8b,
9b and two teeth 13b intermittently rotate the cam wheel 1.
Rotate 6b.

On the other hand, the rotational memory mechanism 10 of limit switch A
a is rotated in the opposite direction C so as to return to the original position at the upper limit position. And Shyatsuta S,
When the actuator 18a reaches the upper limit position, the actuator 18a falls into the recess 17a of the cam ring 16a, turning the micro switch MSa into the OFF state. Therefore, the opening drive circuit for the shutter S is cut off, and the shutter S is accurately and reliably stopped at the preset upper limit position.

Next, press the close button to move the shutter S downward from the upper limit position. In this case, contrary to the opening operation, the rotation storage mechanism 10a of the limit switch A
rotates from the home position in the positive direction D, and during this time the cam wheel 16a turns on the micro switch MSa.
maintained in the state. On the other hand, limit switch B
The rotation storage mechanism 10b is rotated in the opposite direction D so as to return to the original position when the shutter S reaches the lower limit position.

Then, when the shutter S reaches the lower limit position, almost the same as in the case of the opening operation described above, the actuator 1
8b falls into the recess 17b of the cam wheel 16b, turning off the micro switch MSb and cutting off the closing drive circuit of the shutter S. Therefore, the shutter S is
It is stopped accurately and reliably at the preset lower limit position.

In the embodiment described above, two limit switches A and B are connected to each rotary memory mechanism 1.
An example has been shown in which the shutters 0a and 10b are integrally configured with a common input shaft 2 so as to rotate in opposite directions, and the shutter S, which is the controlled object, is stopped at the upper and lower limit positions.

Furthermore, the limit switch of the present invention can be used alone or as a two-way switch as shown in the embodiment.
In addition to the configuration of one set of limit switches, a configuration in which three or more limit switches are linked can also be adopted. In this case, each limit switch may be configured as a single unit having an independent input shaft, and the input shafts may be connected in series. In this case,
By changing the connection direction, the rotation direction of the rotation storage mechanism of each limit switch can be set arbitrarily. For example, if you set the upper and lower limit positions of the shutter on two limit switches, and set the third limit switch so that the rotation memory mechanism comes to the home position at any position where you want to obtain a signal, you can set that position as the boundary. Since the contacts of the microswitch are exchanged at the same time, a voltage-free contact position signal can be obtained. Similarly, it is also possible to configure four or more connections in various connection directions, forward and reverse.

Note that the rotational storage mechanism 10a, 1 in the embodiment
In 0b, two disks are used, but a third or fourth disk is provided to intermittently control the rotation of the input shaft via a pinion and two teeth, etc. that are substantially the same as those described above. It may be configured so that the signal is transmitted sequentially to the discs of the following. In this case, the movement range of the shutter, etc. to be controlled can be set to be large, and the resolution can be increased by reducing the movement range of the shutter, etc., and expanding the movement range of the disk, making it more sensitive. , the accuracy of limit setting positions for shutters, etc. can be improved.

[Effect of the invention] As explained above, according to the limit switch according to the invention, by fixing the set lever in the locked state, the setting arm provided integrally with a part of the set lever has a rotation memory mechanism. The microswitch is fixed at the original position, and the switch arm, which is also integrally provided, directly holds the contacts of the microswitch in a constant state, resulting in the following effects.

(1) The micro switch can be fixed with a one-touch action of pushing and tilting the set lever, and the setting arm can reset the rotation memory mechanism to the origin position, making it easy and reliable to set the limit position and to make fine adjustments after setting. Further, the setting position can be easily corrected or changed. In other words, while the rotation memory mechanism remains fixed at the home position, the microswitches that open and close the motor circuit for raising and lowering the shutter are turned on at the same time.
Since the shutter is held in this state, the slat curtain of the shutter, etc. can be raised and lowered to the fully open or fully closed position.

(2) Since it is composed of a simple mechanical structure, the set limit position is maintained for a long time and the position control accuracy is high.

(3) In the event of a power outage, etc., even if you manually operate the shutter, etc., the set limit position is memorized.

(4) A configuration in which a plurality of limit switches are connected in an interlocking manner so that each rotation memory mechanism and each cam wheel interlocked therewith rotate in an arbitrary combination in the same direction or in opposite directions when viewed relatively. Therefore, in addition to the upper and lower limit positions of the shutter or the like to be controlled, arbitrary limit positions can be set, and position signals that can be used for various purposes can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, Fig. 2 is an exploded perspective view of essential parts of the limit switch A in Fig. 1, and Figs. FIG. A, B...Limit switch, MSa, MSb...Micro switch, 2...Input shaft, 8a, 8b...1st
Discs, 9a, 9b...Second discs, 10a, 10b...
Rotation storage mechanism, 12a, 12b, 15a, 15b
...Set cam as a component of the reset mechanism,
16a, 16b...Cam wheel, 20a, 20b...Set arm as a component of the reset mechanism, 26
a, 26b, 27a, 27b...Pinion as a component of the interlocking mechanism, 28a, 28b...Set lever, 29a, 29b...Switch arm, 31
a, 31b...setting arm, 32a, 32b...locking groove as a locking structure.

Claims (1)

[Claims for Utility Model Registration] A rotation storage mechanism 10a in which the rotation of an input shaft is intermittently transmitted to a plurality of disks coaxially provided through an interlocking mechanism; A cam ring 16a provided in conjunction with each other, and an actuator 18 on the outer periphery of the cam ring 16a.
It has a micro switch MSa that opens the switch when the tip of the cam ring 16a comes into contact with the tip and falls into the recess 17a on the outer periphery of the cam ring 16a, and an arm member provided so as to be freely rotatable around the support shaft 19a. a reset mechanism that releases the interlocking mechanism of the disc when the arm member rotates in one direction and simultaneously sets the cam ring 16a and the rotation storage mechanism 10a to the original position; The set lever 28a is freely provided, and the set lever 28a is provided at the base of the set lever 28a in the tilted position.
An engaging portion that is engaged and fixed to the frame of the limit switch is integrally formed, and an arm member forming the reset mechanism is attached to the leg portion of the set lever 28a in the tilted position. Setting arm 3 to be pressed to a position to rotate in the direction
1a and a set lever 28a from which a switch arm 29a that presses the actuator 18a of the micro switch MSa in a direction in which the switch is closed are integrally formed.