JPH0137116Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a positioning device used, for example, to set the uppermost winding position and the lowermost unwinding position of an electric blind, and more specifically, the present invention relates to a positioning device used when setting the uppermost winding position and the lowermost winding position of an electric blind. The present invention relates to a positioning device that can sense a predetermined electrical or mechanical signal.

[Background Art] Conventionally, a positioning device for the uppermost winding position and the lowermost unwinding position of an electric blind has a feed screw shaft that is rotated by the shaft of a motor that winds up the hanging string of the blind, and a feed screw shaft that is screwed onto the feed screw shaft. It consists of a nut member that moves linearly along a predetermined guide, and a micro switch that is operated by this nut member. When the switch was activated, this microswitch would issue a signal to stop the motor.

However, the amount of winding in one rotation of conventional electric blinds is about 9 cm, and in order to roll up blinds that can reach up to 4 m, more than 40 rotations are required. In order to set the switch, a fairly long feed screw shaft is required, which increases the size and price of the device, and also reduces the operating accuracy of the micro switch due to backlash between the feed screw shaft and the nut member. It has the disadvantage of being bad. In addition, in order to make the winding and lowering positions variable, the fixed position of the microswitch must be set movably, and the means for moving the microswitch is a separate Since this is done using a screw shaft, the amount of movement of the microswitch is limited by the length of this newly installed screw shaft, and it is difficult to move the microswitch beyond this limit. In this case, there was also the drawback that components such as microswitches were destroyed.

Furthermore, there are positioning devices that use a worm gear instead of the feed screw shaft, but even those that use this worm gear have almost the same drawbacks as mentioned above, and in any case, there are major practical problems. Ta.

In addition, this type of positioning device is not only used for electric blinds, but is also required for various other devices that require a predetermined electrical or mechanical signal after multiple rotations. However, a low-cost, highly accurate device had not yet been developed.

[Purpose of the invention] An object of the invention is to provide a positioning device that is small, inexpensive, and highly accurate.

[Structure of the invention] In the present invention, a two-stage external gear is rotatably attached to an eccentric cam provided on a rotating shaft, and a first internal gear is attached to one gear of the two-stage external gear. and a second internal gear is internally meshed with the other gear, and the second internal gear is attached to the body by an adjusting means so that its fixed position can be adjusted, whereby the external two-stage gear and A kind of planetary gear mechanism or differential mechanism is constituted by the first and second internal gears, and the rotation of the rotating shaft is decelerated and transmitted to the first internal gear. The internal gear 1 has, for example, an actuating part formed of a protrusion on its peripheral surface, etc., and this actuating part associates with an actuated part such as a micro switch, and sends a predetermined electrical or mechanical signal to this actuated part. In addition, structurally, the axially long member such as the feed screw shaft in the conventional example is omitted to achieve miniaturization and cost reduction. The purpose of this invention is to improve the accuracy by using a gear means with higher precision than a shaft or the like, thereby achieving the above object.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

The block-shaped body 10 is provided with a through hole 11 extending through its approximate center, and lids 12 are attached to the front and rear surfaces of the body 10 to close the through hole 11. There is. This lid body 12 is formed into a plate shape, and has a through hole 13 formed in its center, and a hub portion 14 is formed in each inner portion of this through hole 13.

A rotating shaft 1 is provided between the through holes 13 of the front and rear lid bodies 12.
5 is rotatably supported, and this rotating shaft 15 has a hexagonal hole 16 at its center, and an eccentric cam 17 is integrally formed on the outer periphery of the center in the longitudinal direction. A two-stage external gear 18 is rotatably attached to the eccentric cam 17. A first internal gear 21 is internally meshed with one of the small diameter gears 19 of the two-stage external gear 18, and the two-stage external gear 18 is engaged with a first internal gear 21.
The other large diameter gear 20 of No. 8 has a second internal gear 2.
3 is engaged with the internal teeth. These first and second internal gears 21 and 23 are rotatably supported by the hub portion 14 of the lid 12, respectively, and the first internal gear 21 has an operating portion 22 formed of a protrusion on its outer periphery. On the other hand, a serration 24 having a triangular ridge shape in cross section is integrally formed on the outer periphery of the second internal gear 23.

A micro switch 26 as an actuated part is installed in a recess 25 formed in the lower part of one side of the body 10, and an actuation button 27 of this micro switch 26 is connected to the actuation part 2 of the first internal gear 21.
It is possible to face 2. Therefore, when the first internal gear 21 rotates and the actuating part 22 comes into contact with the actuating button 27, an electric signal is generated from the micro switch 26, and the power to the rotary shaft drive motor (not shown) is turned on or off. It is becoming more and more common.

Further, a hexagonal socket bolt 30 is inserted into the tip small diameter hole 29 of the stepped hole 28 formed from the lower surface of the body 10.
is supported at its outer end by a push nut 31 so as to be rotatable and prevented from coming off. This push nut 31 is formed in the shape of a disc spring, and its outer periphery bites into the wall surface of the stepped hole 28 to prevent it from falling off. Further, a part of the inner wall of the small diameter hole 29 is opened and communicated with the through hole 11 of the body 10, and the opening position is set to coincide with the serration 24 of the second internal gear 23, so that this A portion of the hexagonal socket bolt 30 is exposed from the opening into the through hole 11 and is adapted to mesh with the serrations 24 of the second internal gear 23. Therefore, when the hexagonal socket bolt 30 is rotated, the serrations 2 engaged with the hexagonal socket bolt 30 are rotated.
4, the second internal gear 23 is connected to the hub portion 1.
It is designed to rotate around 4. On the other hand, rotation from the second internal gear 23 side does not rotate the hexagon socket head bolt 30 due to the relationship with the lead angle of the hexagon socket head bolt 30, so unless the hexagon socket head bolt 30 is rotated. , the second internal gear 23 is supported at a predetermined fixed position relative to the body 10. Here, the hexagon socket bolt 30 and the serrations 24 constitute an adjusting means for adjusting the fixing position of the second internal gear 23.

Note that the reference numeral 32 indicates the hexagonal hole 1 of the rotating shaft 15.
This is a hexagonal shaft-shaped drive shaft inserted into the drive shaft 6, and is, for example, a drive shaft for a hanging cord winding reel of an electric blind.

Next, the operation of this embodiment will be explained.

When the rotary shaft 15 is rotated through the hexagonal hole 16 as the drive shaft 32 rotates, the external two-stage gear 18 attached to the eccentric cam 17 of the rotary shaft 15 also tries to rotate. Since the other gear 20 of the two-stage external gear 18 is meshed with the second internal gear 23 which is in a fixed state by the action of the hexagonal socket bolt 30, the upper internal gear of the second internal gear 23 The gear rotates in a rolling manner, and is decelerated by the ratio of the number of teeth. Since one gear 19 also rotates as the other gear 20 rotates, this one gear 19 rotates.
The first internal gear 21 meshed with the first internal gear 9 rotates on the hub portion 14 while being further decelerated by the ratio of the number of teeth.

The rotation of the first internal gear 21 sequentially moves the actuating part 22 provided on the circumferential surface of the first internal gear 21, and the actuating part 22 actuates the actuating button 27 of the micro switch 26. Then, the micro switch 26 outputs a predetermined signal, for example, the drive shaft 32.
A stop signal is issued to the motor driving the motor, and the rotation of the drive shaft 32 is stopped. Therefore, for example, when this embodiment is used as a positioning device for detecting the upper limit of the winding of an electric blind, the winding of the blind is stopped by the signal from the micro switch 26, and on the other hand, the winding of the blind is stopped, that is, the drive motor is reversed. is performed by a separate similar circuit, and by this reversal, the drive shaft 32 is also reversed, and the first internal gear 21 is also reversed, so that the actuating section 22 moves in a direction away from the actuating button 27 of the micro switch 26. and prepare for the next operation.

To adjust the operating position of the micro switch 26, insert a suitable wrench into the hexagonal hole of the hexagonal socket bolt 30 and rotate the hexagonal socket bolt 30. The second internal gear 23 rotates through the serrations 24 that do not have a serration, and the first internal gear 21 further rotates through the other gear 20 and one gear 19.
The rotation of the first internal gear 21 changes the initial position of the operating section 22, and the time from the start of rotation of the drive shaft 32 to the operation of the operating button 27 by the operating section 22, that is, the number of rotations of the drive shaft 32. changes, and the set value of the micro switch 26 can be changed.

According to this embodiment as described above, a planetary gear mechanism or a differential mechanism is used instead of using a long member such as the feed screw shaft in the conventional example, so that the external dimensions of the device, especially the axial dimension, can be reduced. can be significantly shortened,
The device can be made smaller. In addition, the parts that make up the device do not require expensive parts such as a feed screw shaft, and can be made with simple parts such as gears, so they can be manufactured at low cost, and the number of parts can be reduced. It can be done cheaply. Furthermore, since it is constructed from a simple combination of gears, etc., highly accurate parts can be easily obtained, and the accuracy of the entire device can be improved. Furthermore, since the adjusting means for determining the timing at which the micro switch 26 is actuated is composed of the hexagonal socket bolt 30 and the serration 24, there is no problem even if the hexagonal socket bolt 30 is turned endlessly; There is no risk of damage to the device due to over-operation of the adjusting means as in the example above. Furthermore, when setting the operation timing of the micro switch 26, the micro switch 26 does not need to be moved.
The terminals can also be fixed to the base of the control drive circuit (not shown), which eliminates the need for wiring with lead wires when the microswitch is movable, which improves work efficiency and prevents poor conduction. etc. can be effectively prevented from occurring. Further, by using a plurality of devices of this embodiment, it is possible to provide an inexpensive and compact device that can position at the upper limit, the lower limit, or any position between them.

FIG. 3 shows a specific structure of an apparatus capable of positioning the upper and lower limits using two of the above-described embodiments. In this figure, between the lower ends of the main bodies 10 of both positioning devices is a printed circuit board 41.
A drive shaft 32 is inserted through the lid body 12 of both devices, and a retaining ring 42 is attached to the outside of each positioning device to prevent the drive shaft 32 from coming off. Further, a relay, a power supply circuit and other electric circuits 43 are mounted on the printed circuit board 41, and receive signals from the micro switch 26 to drive a drive motor (not shown).
It is under control. Furthermore, the assembly assembled in this way has a hexagon socket head bolt 30 for adjustment.
It is attached to an attached device 50 such as a case of an electric blind via a spacer 44 at a position where it does not interfere with the case (see FIGS. 1 and 2).

According to such a configuration, there is an advantage that a device capable of positioning the upper and lower limits can be manufactured as an integrated device, and that the device including the electric circuit 43 can be made compact.

In the embodiment shown in FIG. 1, the rotary shaft 15 is supported by the lid 12 attached to the body 10, but the present invention is not limited to this. internal gear 2
1. The second internal gears 23 are rotatably supported on the lid body 12, and the first internal gears 21, the second internal gears
The rotary shaft 15 may be rotatably supported by the internal gear 23, and in short, the rotary shaft 15 only needs to be rotatably supported with respect to the body 10. Further, the operating portion 22 of the first internal gear 21 is
It is not limited to the one provided on the circumferential surface of the first internal gear 21 as in the above embodiment, but other configurations such as the one provided on the end surface may be used. In short, the first internal gear 2
It is sufficient that the actuating portion 22 is formed in a part of 1.
Furthermore, the actuated part does not have to be the micro switch 26 as in the above embodiments, but may be other switches such as a reed switch or an air switch.
Alternatively, in the case of manually rotating the drive shaft, a mechanical stopper or the like may be used, as long as it operates in conjunction with the operating section 22 and can output an electrical or mechanical signal. Further, the adjusting means is not limited to the hexagon socket head bolt 30 and the serration 24 as in the above embodiment, but may also be a combination of a worm and a worm wheel, or a second inner tooth that is completely rotatable. The gear 23 is attached to the lid body 12.
It may be fixed with a locking screw passing through it, or some other structure may be used. However, if the above-mentioned embodiment or a combination of a worm and a worm wheel is used, fine adjustment is possible and infinite rotation is possible, so that the same effects as in the above-mentioned embodiment can be obtained.

[Effects of the Invention] According to the present invention as described above, it is possible to provide a small, inexpensive, and highly accurate positioning device.

[Brief explanation of drawings]

Fig. 1 is a front view with the lid removed showing an embodiment of the positioning device according to the present invention, Fig. 2 is a vertical sectional view of Fig. 1, and Fig. 3 is an application using two of the above embodiments. FIG. 3 is a front view of the device. 10... Body, 15... Rotating shaft, 17... Eccentric cam, 18... External two-stage gear, 19... One gear, 20... Other gear, 21... First internal gear, 22... Operating section, 23... Second internal gear, 24, 30... Serration and hexagon socket head bolt constituting adjustment means, 26... Micro switch as actuated section.

Claims (1)

[Scope of utility model registration request] a body, a rotary shaft rotatably supported within the body and having an eccentric cam; a two-stage external gear rotatably attached to the eccentric cam of the rotary shaft; and one of the two-stage external gears. a first internal gear that is internally meshed with the gear and has an operating portion; and a second internal gear that is internally meshed with the other gear of the two-stage external gear and whose position is adjustable and fixed to the body. A positioning device comprising an internal gear, an adjusting means for adjusting the fixed position of the second internal gear, and an actuated part associated with the actuating part of the first internal gear.