JPS61243624A - Limit switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a microswipe system that allows a control object such as a shutter to match a plurality of arbitrarily set positions.

The present invention relates to a limit switch device in which a switch operates to output a position signal of the shutter or the like.

[Conventional technology]

For example, a conventional limit switch used to control the drive of a shutter or the like has a pair of rotation counting mechanisms that rotate in opposite directions in conjunction with the rotation of one common input shaft. The upper and lower limit positions of the shutter, which are set in advance, are respectively detected by the pair of rotation counting mechanisms, and a position signal is output at the relevant position to perform shutter stop control and the like.

[Problem that the invention seeks to solve]

For example, in controlling the drive of a shutter, etc., it is often necessary not only to stop the shutter at the upper and lower limit positions, but also to provide a position signal at a desired intermediate position. That is, this is the case when the intermediate position signal is used to stop the shutter at the intermediate position, or to operate another controlled object. However, in conventional limit switches, the rotation counting mechanisms are fixed in pairs so that they rotate in opposite directions. Therefore, as mentioned above, if you want to set the limit position at a position other than the upper and lower limit positions of the shutter, it is not always possible to set the limit position in the necessary and sufficient number of positions or in the rotation direction of the rotation counting mechanism with the combination of conventional limit switches. There was a problem in that it was not possible to select the desired configuration, resulting in wasted configuration.

[Purpose of the invention]

The present invention has been made in order to solve the above-mentioned problems, and it is possible to output necessary position signals by arbitrarily selecting the number of set limit positions and the rotation direction of the rotation storage mechanism. It is an object of the present invention to provide a limit switch device that can be configured as follows.

[Means for solving problems]

In order to achieve the above object, the limit switch device of the present invention detects the position of a controlled object by a rotational memory mechanism linked to an input shaft and outputs a signal at a set position by reducing the number of limit switches according to the number of required signals. The input shaft is characterized in that three or more of the input shafts are interlocked and connected in any rotational direction on the input shaft.

[First Embodiment] Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 8.

First, the structure of a limit switch, which is a component of a limit switch device, is shown in FIGS. 1 to 4 and will be described.

In the figure, beam 1 is the frame of Mitsutsinch. A manpower shaft 2 is rotatably installed in the lower part of the frame 1. Both ends of the human power shaft 2 protrude outward from the frame 1, and are configured so that rotational output from an external device can be input from either end. A drive gear 3 is fixed to the right side of the input shaft 2 within the frame l.

Further, a rotary disk shaft 4 is integrally formed on the frame 1 on one side of the input shaft 2 diagonally in parallel with the input Ikl+2. Several driven gears 5 are rotatably arranged on the right side of the rotating disk shaft 4, and the driven gears 5 are configured not to slide along the rotating disk shaft 4. The driven gear 5 meshes with the drive gear 3.

A large-diameter interlocking gear 6 is fixed to one end surface of the driven gear 5, and as the driven gear 5 rotates, a rotating disk N+ 4 is rotated.
It is configured to rotate around the Further, next to the interlocking gear 6, a first disc 7 and a second disc 8 are arranged at predetermined intervals in the axial direction so as to be rotatable with respect to the rotating disc shaft 4. is fixed and installed. The interlocking gear 6, the first disc 7, and the second disc 8 are configured to interlock as a rotation storage mechanism 9 of the limit switch via pinions 21 and 22, which will be described later.

Teeth 7a are formed all around the half of the first disc 7 on the side of the motion gear 6, and are configured to mesh with a pinion 21 rotated by the motion gear 6. In addition, a heart-shaped set cam 1 is provided on the end surface of the first disc 7 on the interlocking gear 6 side.
0 is coaxially fixed, and on the end surface on the second disk 8 side,
One double tooth 11 is provided near the outer periphery.

Teeth 8a are formed on the half of the second disc 8 on the first disc 7 side, and are configured to mesh with a pinion 22 that is intermittently rotated by the two teeth 11. Further, a heart-shaped set cam 12 is coaxially fixed to the end surface of the second disc 8 on the first disc 7 side, facing in the same direction as the set cam 10 of the first disc 7. . A camshaft 13 is provided on the other end surface of the second disc 8.
At the same time, it is configured to be able to rotate around the rotating disk shaft 4.

The cam ring 13 is a perfectly circular cam whose center is inserted through the rotating disk shaft 4, and has four parts 14 formed at -. points on its outer peripheral surface. A microswitch MSI is provided on the side of the cam wheel 13. The actuator 15 of the microswitch MSI is locked to the outer peripheral surface of the cam ring 13, and the microswitch MSI is configured to be opened only when the actuator 15 falls into the four parts 14. When the set cam 10.12 is set to the home position by the set arm 17.17 described later, the cam wheel 13 immediately turns off the actuator 15 of the microswitch MSI, as shown in FIG. The formation position of the four parts 14 is set so as to maintain the ON state at the position.

Next, next to the rotating disk shaft 4, a support shaft 16 is fixed to the frame l in parallel with the rotating disk shaft 4. Support @11
16 is swingably provided with two cent arms 17 and 17 each having a convex portion 17a at the tip. Both ends of a substantially U-shaped support bracket ■8 are fixed to the support side ends of both set arms 17.17 at right angles to the longitudinal direction of set arms 17.17. 17.17 is configured to be able to swing around the support shaft 16 as a - body. Further, a pair of mounting plates 19 are provided on the upper part of the support bracket 18 and protrude parallel to the set arm 17.
A pinion shaft 20 is installed between the pinion shafts 19 and 19 . The pinion shaft 20 has one end 20a that protrudes outward from the plate 19. Further, a pinion 21.22 is rotatably provided between the two claw plates 19, 19 and fixed in the axial direction. Although not shown, the pinion shaft 20 is pressed toward the rotating disc shaft 4 by a biasing member such as a spring.

Therefore, as shown in FIG. 2, the pinion 21 is usually
The pinion 22 meshes with the motion gear 6 and the teeth 7a of the first disc 7, and the pinion 22 meshes with the two teeth 11 of the first disc 7 and the teeth 8a of the second disc 8 when set at the origin position. They are interlocked.

Next, a set lever 23 is provided at one end of the end 20a of the pinion shaft 20. The Cera I lever 23 has an operating section 23a at the top and a substantially triangular suppressing section 2 at the bottom.
3b is provided, and the slope 24 of the pressing portion 23b faces the pinion shaft 2o. Then, when the set lever 23 is pushed down to the set position, the pinion shaft 2o is swung in a direction away from the rotating disk shaft 4 about the support shaft 16 while sliding on the slope 24, and the The arm 17.17 is configured to be swung around the support shaft 16 to set the set cam lo, 12 at the original position. Further, a protrusion 25 is formed approximately at the center of the set lever 23. And in the frame l,
An L-shaped stopper 26 is provided as a fixing mechanism, and the tip of the stopper 26 engages the protrusion 25, thereby fixing the set lever 23 at the set position.

Next, as a first embodiment of the present invention, three limit switches LS1. The mint switch device 27 configured by interlocking LS2 and LS3 will be explained.

As shown in FIGS. 5 to 7, the limit switch device 2
7 is limit switch LSI and limit switch LS
The input shaft 2.2 is interlocked and connected so that each rotation storage mechanism 9.9 of the limit switch LS2 rotates in the forward direction and the reverse direction a, respectively.
The other end is connected to one end of the input shaft 2 of the limit switch LS3, so that the rotation storage mechanism 9 of the limit switch LS2 and the rotation storage mechanism 9 of the limit switch LS3 rotate in opposite directions. This is what I did. As shown in FIGS. 6(a) and 6(b), the method of coupling the input shaft 2.2 is to add a semi-cylindrical cut-off part to each end of the input shaft 2.2, and then attach a cylindrical member. Alternatively, as shown in FIGS. 7(a) and 7(b), serration teeth may be added to the ends of the input shaft 2.2, respectively.
They may be joined by a boss 29 having serration grooves.

As shown in FIG. 8, the limit switch device 27
This is used as an automatic stopping device for a winding shutter S. Roll-up shutter S (hereinafter referred to as shutter S)
It is called. ) is interlocked and connected to a switch 31 connected to a control panel 3o. The control panel 30 has a configuration in which an open operation circuit and a close operation circuit are connected in parallel, and an open button Bl and a close button B2 provided for both circuits, respectively.
By operating the shutter S, the shutter S can be driven down A. Further, the control @3o is provided with another opening operation circuit, and is configured so that when it is desired to fully open the shutter S, the shutter S can be driven by operating the push button B3. has been done.

The input shaft 2 of the limit switch LSI constituting the limit switch device 27 is interlocked with the switch 31, and the microswitch MSI of the limit switch LSI is connected in series with the other opening operation circuit. There is. Further, the microswitch MS2 of the limit switch LS2 is connected in series to the closing operation circuit, and the microswitch MS3 of the limit switch LS3 is connected in series to the opening operation circuit.

Here, as shown in FIG. 4, when the shutter S moves in the opening direction, the cam wheels 13 and 13 of the limit switches LSI and LS3 rotate in the opposite direction (arrow A in the figure).
The direction in which the cam wheel 13 of the limit switch LS2 rotates will be referred to as the forward direction (arrow B in the figure).

Next, regarding the operation of the configuration described above, the shutter S is located at the eye position (a), the lower limit position (b), and a desired intermediate position (/\) (hereinafter simply referred to as the intermediate position (c)). ), limit switch LS1. The procedure for setting each of LS2 and LS3 will be explained.

Note that the direction of connection of the limit switch is such that the direction of rotation of the limit switch LSI and limit switch LS2 is the forward direction and the opposite direction (or the reverse direction and the forward direction) as described above. The direction in which LS3 is coupled to limit switch LS2 may be either the forward direction or the reverse direction, and can be selected as appropriate. In this embodiment, an example in which the limit switch LS3 is coupled in the forward direction as shown in FIG. 5 will be described.

First, the set levers 23 of the limit switches LSI, LS2, and LS3 are pressed downward to fix them at the set position.

At this time, as shown in FIGS. 3 and 4, the pinion shaft 20 slides along the slope 24 of the pressing portion 23b.
Since it swings to the upper left about the support shaft 16, the pinion 2
1.22 is set at zero from the motion gear 6, the first disc 7, and the second disc 8, and is fixed at a position away from these. Therefore, in this state, even if the input shaft 2 rotates, the driven gear 5 only rotates, and the first disc 7 and the second disc 8 are
No rotational force is transmitted.

Further, as the pinion shaft 20 swings, the set arm 17.17 swings upward. Set arm 17.1
7, the convex parts 1'7a, 17a are connected to the cam 10.1.
2 and rotate the set cam 10.1'2. When the set lever 23 is fixed at the set position, the set arm 17.
The convex portions 17a, 17a of the set cam 10.17 are engaged with the concave portions 10a, 12a of the set cam 10.12, and the first disc 7 and the second disc 8 are set at the original position. At this time, the four parts 14 of the cam wheel 13 are on the right side, and the microswitch MS1. The actuators 15 of MS2 and MS3 are fixed in the ON state immediately below the four parts 14. Therefore, the shutter S can be freely driven to unload by operating the open button B1, close button B2, etc.

In the above state, open the shutter S by operating the button.
Move it to the eye position (a). At this point, pull the center lever 23 of the limit switch LSI to one side,
Unpin. The pinion 21.22 is the motion gear 6,
Since the first disc 7 and the second disc 8 are interlocked again,
The cam wheel 13 moves in conjunction with the rotation of the opening/closing device 31 of the shutter S.

Next, the shutter S is lowered by operating the close button,
Move it to the intermediate position (c). At this point, similarly to the limit switch LSI, the set lever 23 of the limit switch LS3 is released.

Furthermore, by operating the close button, the shutter S is lowered and moved to the lower limit position (b). At this point, similarly to the limit switch LSI, the limit switch LS2
release the set lever 23.

Note that the order of setting the upper limit, lower limit, and desired intermediate positions of the limit switch is not limited to the order described below.

Next, do the above--eye position (a), lower limit position (
The operation of the limit switch device 27 in which the positions (b) and intermediate position (c) are set will be explained.

First, the open button Bl is pressed to move the shutter S upward from the lower limit position (B). Limit switch LS2
The rotating shaft 2 rotates in synchronization with the rotation of the opening/closing machine 31, and the rotation storage mechanism 9 starts stopping rotation from the origin position. That is, when the first disc 7 rotates once, the double weight 11 returns and rotates the pinion 22 by one tooth. And pinion 22
The second disc 8 that meshes with the cam 8 also rotates by one tooth, and the cam ring 13 is rotated in the forward direction B by a predetermined angle. During this time, the microswitch MS2 remains fixed in the ON state, and from then on,
The input shaft 2 rotates by intermittently rotating the cam ring 13 by the disk 7.8 and the double weight 11.

On the other hand, the rotation storage mechanism 9 of the limit switch LS3 is rotated in the opposite direction A so as to return to the original position at the intermediate position (c). Then, the shutter S is at the intermediate position (c)
When it comes to , it will be in the same state as the setting poem, as shown in Figure 4. In this state, the double weight 11 of the first disc 7 is
is engaged with the pinion 22, so the motion gear 6, the first disc 7, and the second disc 8 are interlocked in the opposite direction A. Here, if the shutter S moves even slightly in one direction from the intermediate position (C), the rotation of the opening/closing device 31 immediately rotates the cam wheel 13 in the opposite direction A, so the actuator 15 moves the cam wheel 13 14, and turns off the microswitch MS3. Therefore, the opening operation circuit for the shutter S is cut off, and the shutter S is accurately and reliably stopped at the preset intermediate position (c).

Next, press the close button and move the shutter S to the intermediate position (c).
move it downwards. In this case, contrary to the opening operation, the rotation storage mechanism 9 of the limit switch LS3 rotates in the forward direction B from the origin position, and the cam wheel 13 holds the microswitch MS3 in the ON state. On the other hand, the rotation storage mechanism 9 of the limit switch LS2 is configured such that when the shutter S reaches the lower limit position (b), it returns to the original position.
It is rotating in the opposite direction A. Then, as in the case of the opening operation described above, if the shutter S moves even slightly downward from the lower limit position (B), the cam wheel 13 immediately rotates in the opposite direction A and turns the microswitch MS2 into the OFF state. , cut off the shutter S closing operation circuit. Therefore, the shutter S is
It is accurately and reliably stopped at a preset lower limit position (b).

Next, if you want to fully open the shutter S, press button B.
3, the shutter S is moved upward. The rotation storage mechanism 9 of the limit switch LSI has a shutter S
is rotated in the opposite direction A so that it returns to the home position at the 1st limit position (A).

Then, when the shutter S reaches the upper limit position (A),
As shown in FIG. 4, the cam wheel 13 of the limit switch LSI is in the same state as when the -1-limit position (A) is set. In this state, if the shutter S moves even slightly in one direction, the rotation of the opening/closing device 31 immediately rotates the cam ring 13 in the opposite direction A, so the actuator 15 falls into the four parts 14 of the cam ring 13. , turn off the microswitch MSI. Therefore, the other opening operation circuit of the shutter S is cut off, and the shutter S is set in advance.
- Take your turn to stop accurately and reliably at the eye position (A).

In the embodiment described above, the shutter S is configured to stop at the intermediate position (C) during the opening operation.
The limit switch of this device can be connected to either end of the input shaft 2, so if the limit switch LS3 is connected in the opposite way to the above configuration, when the shutter S is on one side from the intermediate position (c), , micro switch, 2
-M53 is fixed in the ON state. Therefore, in the case of such a connection configuration, while the shutter S is in the closing operation,
It will stop at the intermediate position (c).

[Second Embodiment] Next, as a second embodiment of the present invention, a limit switch device 32 constructed by interlocking and connecting four limit switches LS4, LS5, LS6, and LS7 will be described. Note that the limit switches LS4 and LS in the second embodiment
5, LS6, and LS7 are limit switches LS1.5 of the first embodiment. It is the same as LS2 and LS3, and the method of connecting the input shaft 2 is also as described above.

As shown in FIG. 9, the limit switch device connects limit switches T, S4 and limit switch LS5 so that their respective cam wheels 13, 13, etc. rotate in opposite directions, and LS5
In addition, limit switches LS6 and LS7 are sequentially connected such that their respective cam wheels 13, 13, etc. rotate in the same direction as the cam wheels 13, etc. of limit switch LS5.

Here, limit switch LS4 and limit switch L
If S5 is connected in the forward and reverse directions (or in the reverse and forward directions), limit switch LS6 and limit switch LS
7 can be selected in forward and forward directions, reverse and reverse directions, forward and reverse directions, and reverse and forward directions; The connected structure is shown in FIG.

As shown in FIGS. 9 and 10, the shutter S to which the limit switch device 32 is attached is configured to be driven downward in the Y direction by the opening/closing device 33. The opening/closing machine 33 is connected to a control panel 34, and the control panel 34 is provided with a push button switch B4 for operation. Furthermore, an automatic closing device 35 is provided on the side of the opening/closing device 33, and the automatic closing device 35 releases the brake of the shank S when turned on.The automatic closing device 35 is connected to a disaster prevention panel 36 by wiring. The disaster prevention panel 36 is wired to smoke detectors 37 and heat detectors 38 installed at important points in the room, and detects a fire etc. that occurs indoors and outputs a signal to the automatic closing device 35. death,
It is configured so that the shutter S can be closed.

The micro switch MS4 of the limit switch LS4 is
The microswitch MS5 of the limiter switch LS5 is connected to the closing operation circuit of the control panel 34. Further, the micro switch MS6 of the limit switch LS6 and the micro switch MS7 of the limit switch LS7 are respectively connected to the automatic closing device 35.

Here, as shown in FIG. 4, when the shutter S moves in the opening direction, the direction in which the cam wheel 13 of the limiter i switch LS4 rotates is in the opposite direction (arrow A in the figure).
- The direction in which the cam wheels 13 of switches LS5, I, 3B, and LS7 rotate is called the forward direction (arrow B in the figure).

Next, a procedure for setting a limit position in the limit switch device 32 described above will be explained, but descriptions of operations that are substantially the same as those in the first embodiment will be omitted.

First, the set levers 23 of the limit switches LS4, LS5, and LS7 are pressed downward to fix them at the set position.

Next, the shutter S is set to the upper limit position (d) by operating the pushbutton switch B4, and the limit switch LS4
release the set lever 23. Next, shutter S
is set to a desired intermediate position (E) (hereinafter simply referred to as the intermediate position (E)), and the set lever 23 of the limit switch LS6 is released from the fixed position. Finally, Sha, Atta S
is set to the lower limit position (to), and at this position, the set levers 23 of limit switches LS5 and LS7 are released from fixation.

It goes without saying that the limit position setting order of the limit switch device 32 is not limited to the above-described order.

Next, the operation of the limit switch device 32 with a set limit position will be explained. In addition, the action and function of limit switches LS4 and LS5 are as follows:
They are stopped at the eye position (D) and the lower limit position (H), respectively, and are approximately the same as the nine functions of the limit switches LSI and LS2 in the first embodiment.
The explanation will be omitted.

Now, when the shutter S is at the upper limit position (d), the micro switch MS6 of limit switches LS6 and LS7
, MS7 are both fixed to the ON state. here,
Considering the case where a fire breaks out indoors, first assume that the smoke detector 37 outputs a detection signal. The disaster prevention panel 36 receives the detection signal and sends a signal to the automatic closing device 35. The automatic closing device 35 operates upon receiving the signal, and closes the shutter S.
release the brake. The shutter S begins to descend under its own weight, and at the same time, the rotation storage mechanism 9 of the limit switches LS6 and LS7 begins to rotate in the opposite direction A. When the shutter S reaches the intermediate position (E), limit switch L
The microswitch MS6 of S6 is turned off, the automatic closing device 35 is released, the brake is closed, and the shutter S is stopped.

The fire was not extinguished, and smoke detector 37 was followed by heat detector 38.
When the shutter S outputs a detection signal, the automatic closing device 35 is activated again and the shutter S starts lowering. At the same time, the rotation storage mechanism 9 of the limit switch LS7 starts rotating in the opposite direction A. When the shutter S reaches the lower limit position, the micro switch MS of the limit switch LS7
7 is in the OFF state, the automatic closing device 35 is released, the brake is closed, and the shutter S is stopped.

In the two embodiments described above, three to four limit switches are interlocked on the input shaft so that the desired rotation direction is set, and the shutter S is activated at any preset position. It is configured to stop. However, the method of using the position signal is not limited to the above example. For example, the limit switch device may be connected to an external display so that the position and moving direction of the shutter S can be displayed.

In addition, in the rotation storage mechanism 9 in the embodiment, two discs are used, but a third or fourth disc is provided, and through a pinion and two teeth that are substantially the same as those described above, It may be configured such that the rotation of the input shaft is intermittently transmitted sequentially to adjacent discs. In this case, the movement range of the shutter or the like to be controlled can be set to be large. Furthermore, in this case, if the movement range of the shutter etc. is made smaller and the movement range of the disc is enlarged and made more sensitive, the resolution will increase and the accuracy of the shutter etc. glue mint setting position can be improved.

〔Effect of the invention〕

As explained above, the limit switch device according to the present invention is constructed by interlocking and connecting at least three limit switches in accordance with the number of required signals so that the input shaft rotates in any direction. Therefore, it has the following effects.

(1) 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. Since it can be configured, arbitrary limit positions can be set in addition to the upper and lower limit positions of the shutter or the like to be controlled, and position signals that can be used for various purposes can be obtained.

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

(3) Even if the shutter etc. are manually operated in the event of a power outage, the set limit position is memorized.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of essential parts of a limit switch according to an embodiment of the present invention, Fig. 2 is a plan view of the limit switch, and Figs. 3 and 4 are views showing the procedure for fixing the central lever. , FIG. 5 is a plan view showing the first embodiment of the present invention,
FIGS. 6(a) and 6(b) are a sectional view and a plan view showing the input shaft coupling portion in the embodiment, respectively, and FIG. 7(a)
) and (b) are the same cross-sectional view and plan view, respectively.
9 is a plan view showing the second embodiment of the present invention, and FIG. 10 is a diagram showing the overall structure of the second embodiment of the present invention. 2...Input shaft, 9...Rotation memory mechanism, 27.32.
...Limit switch device, LS1-7...Limit switch. Patent applicant: Bunka Shutter Co., Ltd.

Claims (1)

[Claims] A limit switch comprising at least three limit switches that detect the position of a controlled object by a rotational memory mechanism interlocked with an input shaft and output a signal at a set position, and are connected together on the input shaft. Device.