JPH11204008A - Counter reset mechanism for limit switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate a counter reset mechanism easily with good workability even when the mechanism is positioned at a high or dangerous place, or at such a position as prohibiting easy reach of a hand to a reset button, and the reset button cannot be easily operated normally. SOLUTION: Solenoids 2 for pushing and pulling the counter reset lever 14 of a limit switch 10 are provided so as to correspond to each of upper and lower counters, and the length of electric wiring for driving the solenoids 1 is pertinently decided, depending the position of the limit switch 10 for allowing a remote operation. As a result, even when the limit switch 10 is positioned at a higher dangerous place, the reset lever 14 can be operated from a low or safe place via the remote operation of the solenoids 1, and frequent access to the high or dangerous place is not needed and good workability is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a counter for counting the number of rotations in conjunction with a rotation axis of a rotation body,
The present invention relates to a reset mechanism for a counter of a limit switch which issues a stop signal to a driving mechanism of the rotating body when the counter indicates a predetermined value.

[0002]

2. Description of the Related Art In an electric shutter or an electric water gate, a limit switch is associated with each movable part, and the limit switch detects a preset stop position of the movable part. The movement is converted into an electric signal, and the electric signal (stop signal) is transmitted to the drive mechanism of the movable unit to stop it, and the movable unit stops. An example of such a limit switch is as follows.

[0003] This limit switch 10 shown in FIG.
A drive shaft 12 that rotates in conjunction with an external movable body, a gear mechanism that operates by rotation of the drive shaft 12 (see reference numeral 30 in FIGS. 4 and 5), and a rectangular case 11.
A mechanical counter (see reference numeral 20 in FIGS. 4 and 5) that operates via the gear mechanism is provided. On the front of the case 11, vertically long counter windows 13, 13 are provided. In this window 13, the numerical value of the counter is displayed. From the side of the case 11, the drive shaft 1
2, the reset lever 14 of the counter protrudes from the back of the case 11 at a diagonal position.

Next, the structure of the limit switch 10 in the case will be described with reference to FIGS. FIG. 4 is a view of the inside of the case 11 as viewed from the back side of FIG. 3, and in the case 11, the drive shaft 12 is disposed in the center of the upper and lower directions and the left and right directions as shown in the figure. A counter 20 and a gear mechanism 30 are provided in each of the upper and lower spaces. As shown in FIG. 3, the drive shaft 12 has one end of the case 11.
It protrudes outside and is connected to an external movable body at that portion.

In this example, the upper side of the drive shaft 12 is used for the upper limit and the lower side is used for the lower limit in this example. is there. As shown in FIG. 5, each counter 20 has a counter drum 22 having ten numbers “0” to “9” engraved on a scale 22a on its peripheral surface, and is inserted into a counter shaft 21. As the 21 rotates, the scale 22a is displayed on the window 13 provided on the wall in front of the case 11. In this example, four counter drums 22 are provided on each of the upper and lower counter shafts 21.
Is inserted, and a four-digit number is digitally displayed. The counter 20 is mechanically connected to a micro switch 40 in the same case 11, and the micro switch 40 is electrically connected to an external drive mechanism that rotates the drive shaft 12.

A gear mechanism 30 for connecting the counter 20 and the drive shaft 12 has a counter shaft 21 disposed in parallel with the drive shaft 12 in the upper and lower directions. Are arranged in a point-symmetrical manner at the center of. On the gears of each gear mechanism 30, a main gear 31 fitted on the drive shaft 12, a relay gear 32 fitted on the countershaft 21 and meshing with the main gear 31, and a four-piece Counter drum 2
There is a counter gear 33 attached to each of the two.

The relay gear 32 among the counter gears 33
A pinion 35 for carry is engaged with each of the counter drive gear 34 meshing with one of the shifts and the relay gear 32 and the remaining three counter gears 33. Each carry pinion 35 is inserted through one common pinion shaft 36, and both ends of the pinion shaft 36 are pivot members 37.
The rotation member 37 is rotatable around a support shaft 38 provided in the case 11. The operation of the rotating member 37 will be described later. The carry pinion 35 is
When the lower digit drum makes one rotation and its scale 22a changes from "9" to "0" at the position of the window of the case 11, it has a function of increasing the scale 22a of the drum of the next higher digit by one. However, since the structure is not related to the essence of the present invention and is a known structure, a detailed description thereof is omitted here. The upper and lower counters 20 are simultaneously operated by the rotation of the drive shaft 12, but the scales 22a are oppositely increased and decreased.

At one end of the counter shaft 21 on the side opposite to the relay gear 32, a disk cam 23 having a notch 23a on its peripheral surface is provided. A switch 40 is provided. The roller 4 at the tip of the operation lever 14 of the microswitch 40
2 is in contact with the peripheral surface of the cam 23, and when in contact with a position without the notch 23a, the operation lever 14 is pressed by the peripheral surface, and the microswitch 40 is pressed by the movable contact by the pin plunger. Is turned on. At this time, the external drive mechanism electrically connected to the microswitch 40 is in an operable state.

On the other hand, when the scale 22 a of the counter 20 indicates “0” at the position of the window 13 of the case 11, the roller 42 of the micro switch 40
When the roller 42 is inserted into the notch 23a, the operation lever 14 jumps up, so that the microswitch 40 is turned off, and a stop signal is issued to an external drive mechanism to stop it. Will be.

The turning member 37 which supports the pinion shaft 36 will now be described. The turning member 37 is pushed and pulled by the reset lever 14 connected in the middle thereof and turns around the support shaft 38. To move the pinion shaft 36 away from the counter gear 33,
, The pinion 35 is separated from the counter gear 33, and the counter drum 22 becomes free. Then, the counter shaft 2 on which the counter drum 22 is inserted is inserted.
1 is also free, and the elasticity of the operation lever 14 of the microswitch 40 causes the roller 42 at the tip in contact with the peripheral surface of the cam 23 to rotate the counter shaft 21 on which the cam 23 is inserted. Notch 23a of cam 23
To fit. If so, the scale 22a of the counter 20
Becomes "0" and if the motor is running before the operation, the motor stops. This is the reset operation of the limit switch 10.

The limit switch 10 having the above configuration
In the shutter 50 shown in FIG. 6, a rotary drum 51 for winding a sheet S (slat) driven by a motor M is provided above the shutter 50. The drive shaft 12 of the limit switch 10 is connected to a rotating shaft 52 of the rotating drum 51 via a gear G.
Then, when the rotating drum 51 is rotated by the motor M (V is a belt in the figure), the drive shaft 12 of the limit switch 10 is also rotated, whereby the counter drum 22 is rotated via the gear mechanism 30. Rotate. When the scale 22a on the peripheral surface indicates a preset value at the position of the window 13 of the case 11, for example, when it becomes "0" in the above example, the cam inserted into the counter shaft 21. The roller 42 of the micro switch 40 fits into the notch 23a of the micro switch 23, the micro switch 40 is turned off, and the motor stops. Further, even if the reset lever 14 is forcibly pulled, the roller 42
Fits into the notch 23a of the cam 23, the scale 22a becomes "0", and the motor stops.

[0012]

By the way, in the shutter 50 provided with the limit switch 10 as described above, at the time of installation, the sheet S is wound up to the maximum and the shutter 50 is completely opened, and the sheet S is completely opened. At the position where the shutter 50 is completely closed by dropping
The lower limit is set, and the setting procedure is as follows.

First, the motor S for driving the rotary drum is operated to raise and lower the sheet S. When the sheet S reaches the upper limit and the lower limit, the limit switch 10 is set at each position.
By operating the reset lever 14, the motor M is stopped. At this time, the scale 22a of the counter 20 becomes "0" at each position as described above. With this, the setting itself is completed, but next, the setting condition, that is,
In order to confirm whether or not to stop at a desired position, the shutter 50 is operated again to confirm.

For example, assuming that the sheet S is at the lower limit position in a state where the setting operation is completed, the lower limit scale 22a of the limit switch 10 points to "0".
The upper limit scale 22a indicates a value corresponding to the rotation of the drive shaft 12. In this state, when the motor M is driven to wind up the sheet S, the lower limit scale 22a increases and the upper limit scale 22a decreases.
Reaches the upper limit position, the upper limit graduation 22a becomes "0", the upper limit micro switch 40 issues an off signal to the motor M, stops the motor M, and stops the sheet S.

Then, from the upper limit position, the motor M
, The upper limit scale 22a increases from “0”, the lower limit scale 22a decreases from the value when the upper limit is reached, and the sheet S moves to the lower limit position. , The lower limit scale 22a becomes "0", the lower limit microswitch 40 issues an off signal to stop the motor M, and the sheet S stops. Thus,
If the sheet S stops at a desired position for each of the upper limit and the lower limit, the checking operation is completed.

The problem here is that in the case of the shutter 50 as described above, the rotary drum 51 is located above, and the limit switch 10 for driving the shaft 12 by the rotary drum is also installed above. In setting and adjusting the upper and lower limits of the seat S, in order to perform the reset operation, the user must climb to a high position with a ladder or the like, which is very troublesome and dangerous. The same applies to a case where the limit switch 10 is installed not only in a high place but also in a position with poor operability where it is difficult to reach the reset lever 14 or in a dangerous place where a person cannot approach. Then, such setting and adjustment work originally need to be repeated several times due to errors in equipment and operation, and if that is the case, it becomes more and more troublesome.

Therefore, an object of the present invention is to solve the problem that the limit switch is installed at a high place or at a position where it is difficult to reach, and the reset lever (button) is usually difficult to operate. , So that the operation can be performed easily, safely and with good workability.

[0018]

In order to solve the above-mentioned problems, the present invention provides a solenoid which can be remotely operated in association with the reset button of the above-mentioned limit switch counter, and operates the solenoid. Thus, the reset button is operated.

With this configuration, even when the limit switch is installed at the above-described high position or at a position where operability is poor such that it is difficult to reach the reset button, the solenoid can shorten the electric wiring. Can be operated remotely, and there is no need to operate the reset button directly by hand.
Even when the limit switch is installed at a high place, the work can be performed at low altitude, which is safe, and the reset switch of the limit switch installed at a low place can be operated at the same time, so that the workability is good.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In this embodiment, as shown in FIGS. 1 and 2, the conventional limit switch 1 described above is used.
0 (see FIG. 3), the solenoid 1 for pushing and pulling the reset lever 14 is provided on the surface of the counter 20 on the side where the reset lever 14 is present.
It is provided in correspondence with. Each solenoid 1 is attached to a bracket 2 provided on a side surface of a case 11 with a bolt B, and the rod 3 is connected to a reset lever 14.

The length of the electric wiring for driving the solenoid 1 is appropriately set according to the installation position of the limit switch 10 so that remote control can be performed.

By doing so, even if the limit switch 10 is installed at the upper limit position of the shutter, that is, at a high position where the rotating shaft 52 of the rotating drum 51 is located, the limit switch 10 is reset by remote operation of the solenoid 1. Since the lever 14 can be operated at low altitude, it is safe, there is no need to go up and down many times to high places, and the workability is good.

Not only at a high position, but also at a dangerous place or at a position where it is difficult for the reset lever 14 to be easily reached, and usually when the reset lever 14 is difficult to operate. But the operation is easy,
Safe and workable

[0024]

The present invention is configured as described above.
There is an effect that the upper and lower limits of the limit switch can be adjusted with good workability and can be safely performed even when the switch is installed at a high place or a dangerous place.

[Brief description of the drawings]

FIG. 1A is a perspective view of a limit switch according to an embodiment, as viewed from the front, and FIG. 1B is a perspective view, as viewed from the back.

2A is a side view, and FIG. 2B is a bottom view of the embodiment of the limit switch.

FIG. 3A is a perspective view of a conventional example viewed from the front and FIG.

FIG. 4A is a schematic view of the inside of the limit switch viewed from the back and FIG. 4B is viewed from the side.

FIG. 5 is a schematic perspective view showing a counter mechanism.

FIGS. 6A and 6B are schematic views of a shutter shown in a front view and a cross section in a side view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 solenoid 2 bracket 3 rod 10 limit switch 11 case 12 drive shaft 13 counter window 14 reset lever 20 counter 21 counter drum 22 counter shaft 23 disk cam 30 gear mechanism 31 main gear 32 relay gear 33 counter gear 35 pinion 40 micro switch 50 Shutter 51 Rotating drum

Claims (1)

[Claims] A counter for counting the number of rotations in conjunction with a rotation axis of the rotation body; when the counter indicates a predetermined value, a stop signal is sent to a driving mechanism of the rotation body. A counter switch of the limit switch, which is provided with a solenoid which can be remotely operated in correspondence with the reset button of the counter, and which operates the solenoid to operate the reset button. mechanism.