JPH01317408A - Bidirectional clutch for curtain opening and closing device - Google Patents

Abstract

PURPOSE:To attain secure clutch cut when a motor is stopped by providing a rotary cam, which is linked to the rotary shaft of the motor, and a rotary body to be held to a hole in the diameter direction of a guide hole between this cam and a pulley main body, which is rotary unitedly with a drum part to be arranged on the same shaft, with being freely rotatable. CONSTITUTION:When a rotary cam 4 to be fit to a rotary shaft 3 of a motor 1 starts rotation, a roller 9, which is arranged in the almost center of a flat part 4a of the cam, is moved in a corner part 4b side and the inclining angle of the roller 9 gradually goes to be small in correspondence to the increase of rotation displacement. Then, the roller 9 brought into contacted with pressure to the inner circumference surface of a rotary drum part 11 by a cam 4 and the rotary force of the motor 1 is transmitted to a pulley main body 14. A string 17 for opening and closing is wound or led-out by a V-channel 18 of the main body 14. When the motor 1 stops the rotation, the rotation of the cam 14 is stopped, however, the main body 14, drum 10, a wheel 5 and the roller 9 are continuously rotated by inertia force. Since the roller 9 is moved from the corner part 4b to the center of the flat part 4a, the roller 9 goes to be free and linking between the rotary cam 4 and main body 14 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bidirectional clutch for a curtain opening/closing device that uses a motor to open and close a curtain.

[Prior Art] Conventionally, when a curtain is automatically moved horizontally or vertically, a motor is used to rotate an opening/closing string that engages the curtain in forward and reverse directions.

In this case, if automatic winding becomes impossible due to a failure in the motor, for example, the opening/closing string will need to be manually wound, but if the pulley is fixed directly to the rotating shaft of the motor, the resistance of the motor This makes it impossible to move the string lightly. Therefore, the pulley around which the opening/closing string is wound.

It is necessary to interpose a clutch mechanism between this and the motor that rotates it, and conventionally, an electromagnetic clutch has generally been adopted.

[Problems to be Solved by the Invention] However, when an electromagnetic clutch is used as in the conventional method described above, an electric control mechanism is required to operate the clutch, which not only complicates the structure and control method but also increases manufacturing costs. The problem was that it became more expensive.

The present invention has been made in view of such conventional problems, and can be manufactured at a relatively low cost, and when the motor is operated, the forward and reverse rotational force of the motor can be reliably transmitted to the pulley side, and the The purpose of the present invention is to provide a two-way clutch for a curtain opening/closing device that can reliably latch disconnect when the motor stops.

[Means for Solving the Problems] In order to achieve the above object, the two-way clutch of the present invention has an appropriate gap between a rotating cam connected to the rotating shaft of a vertically installed motor and this rotating cam. The rotary cam includes a pulley body having a drum portion coaxially provided with a gap, a plurality of rotating bodies interposed in the gap, and a guide wheel that rotatably holds these rotating bodies so as to be tiltable. The rotational force of the motor is transmitted to the pulley body by changing the inclination angle of the rotary body by relative rotation of a predetermined angle or more on a surface facing the circumferential surface of the drum portion and pressing against the drum portion. The present invention is characterized in that a cam portion is provided, and the pulley main body is provided with a pulley groove around which a curtain opening/closing string is wound.

Further, the rotating body may be configured to be movable, and the rotating body may be moved by a rotating cam and pressed against the drum portion to transmit the rotational force of the motor to the pulley body.

A cam surface having the same number of corners as the rotary body may be provided on the outer periphery of the rotary cam, and the rotary cam may be disposed inside the drum portion.

Furthermore, a structure may be adopted in which a cam surface having the same number of protrusions as the rotating body is provided on the inner periphery of the rotating cam, and the rotating cam is disposed outside the drum part.

[Function] When the motor starts, the rotating cam connected to the rotating shaft of the motor starts rotating, while the rotating body and guide wheel maintain inertia in a stopped state, so the guide wheel can tilt or move. The rotating body held by the rotating body is pressed by the cam surface of the rotating cam, tilts or moves outward (or inward) in the radial direction, and is pressed against the drum portion of the pulley body.

As a result, the one-rotating body wedges between the rotating cam and the drum portion, so that the rotational force of the motor is transmitted to the pulley body via these. Since the wedge state is maintained during normal rotation after starting, the rotational force of the motor can be continuously transmitted to the pulley body.

The above operation occurs in the same way both when the motor rotates forward and when it rotates in reverse.

On the other hand, when the rotation of the motor stops, the rotation of the rotating cam stops, but the pulley body, guide wheel, and rotating body continue to rotate due to inertia, and as a result, the rotating body becomes free and the rotating cam and pulley body are separated. connection becomes disconnected. In this case, in order to reliably eliminate the wedge effect caused by the rotating body and the drum section, it is preferable to reversely rotate the motor for only an instant, thereby reliably releasing the biting force in the clutch closed state. can.

In addition, when the curtain is manually opened and closed while the rotating body is free, rotational force is input from the opening/closing string to the pulley body. Since the wheel maintains the inertia of the stopped state, only the pulley body rotates. Therefore, since the rotational force is not transmitted to the rotating body and the guide wheel, the motor does not rotate, and therefore, the load resistance of the motor does not act on the opening and closing of the curtain, so the curtain can be moved easily by manual operation.

For the reasons described above, the rotating cam may be placed either inside or outside the drum portion, and in either case, rotation of the rotating cam transmits rotational force to the rotating drum via the rotating body.

[Example] Next, an example of the present invention will be described with reference to the drawings.

Fig. 1 is a sectional view of the overall structure showing one embodiment of the present invention, Figs. 2 to 4 are sectional views for explaining the operation, and Figs. 5 to 7 are main components of this embodiment. FIG.

First, to explain the configuration, 1 shown in FIG. 1 is a motor having a reducer, and the motor 1 has a set plate 2.
It is fixed at The tip of the rotating shaft 3 of the motor l is formed so that its cross section is quadrangular by cutting off the four surrounding surfaces, and the rotating cam 4 is formed by fitting a square hole 4C into the square shaft.
is installed.

As shown in FIGS. 5(a) and 5(b), the rotary cam 4 has four flat portions 4a provided at positions rotationally displaced by 90 degrees from each other.
and 4 that smoothly continues in an arc shape between adjacent flat parts 4a.
It forms a regular square prism having corner portions 4b at certain points. The rotary cam 4 has a rectangular square hole 4 at its axis.
C and a through hole 4d continuous thereto, and a circular small diameter portion 4e is provided at one end in the axial direction.

A guide wheel 5 is fitted onto the rotary cam 4 with a slight gap. The guide wheel 5 is arranged as shown in Fig. 6 (
As shown in a) and (b), it consists of a sleeve part 5a and an end face part 5b provided to close one end of the sleeve part 5a, and there are four parts that divide the sleeve part 5a into four equal parts in the circumferential direction. Four radial holes 6 are provided that radially penetrate the thick portion.

An inclined support surface 7 inclined inward is provided on the lower surface of the radial hole 6, and each radial hole 6 rotatably houses and holds a roller 9, which is an example of a rotating body. ing. Therefore, each roller 9 is placed on the inclined support surface 7 of the radial hole 6, and in this state, each roller 9 is inclined inward, and the inner surface of its upper end is in contact with the rotating cam 4.

Furthermore, a fitting hole 8 is provided in the center of the end surface portion 5b of the guide wheel 5, into which the small diameter portion 4e of the rotary cam 4 is rotatably fitted.
While supporting the members 4 and 5 from below, the rotational positional relationship between the members 4 and 5 is regulated. A rotary drum IO is fitted onto the guide wheel 5 with a slight gap.

As shown in FIGS. 7(a) and 7(b), the rotating drum 10 is formed continuously and integrally with a cylindrical drum part 11 that covers the outside of the guide wheel 5, and inside this drum part 11. The support shaft 12 of the zero-rotation drum 10, which has a support shaft 12 and a connecting shaft 13 continuously formed integrally with the outside, fits into the through hole 4d of the rotary cam 4, thereby connecting the rotary cam 4 and The rotational positional relationship of the is regulated. Further, the connecting shaft 13 of the rotating drum IO is inserted into a through hole 15 provided in the axial center portion of the pulley body 14, and is connected and fixed to the pulley body 14 by a port 16 inserted from the other end side.

A V@18 for winding the opening/closing string 17 is provided on the outer periphery of the pulley main body 14, and the V groove 18 is set horizontally so that the pulley main body 14 can be mounted from both upper and lower sides by bearings 19 and 20. It is rotatably supported. Then, the upper bearing 19 fits into a hole provided in the support plate 21,
Further, the lower bearing 20 is fitted into a hole provided in the cover plate 22, and both plates 21 and 22 are fixed with rivets 23.

Note that the support plate 21 is fixed to a curtain rail (not shown).

The rotating cam 4 and the roller 9 and rotating drum 10 that come into contact with it are set to have the following relationship.

As for the size and shape of the rotating cam 4, as shown in FIG. 4, etc., the gap between its corner portion 4b and the inner peripheral surface of the drum portion 11 is slightly narrower than the diameter of the roller 9, and as shown in FIG. 2, etc. Thus, the gap between the flat portion 4a and the inner peripheral surface of the drum portion 11 is made larger than the diameter of the roller 9. Therefore, when the roller 9 moves from the flat part 4a to the corner part 4b of the rotating cam 4, the roller 9 is pressed against the inner circumferential surface of the drum part 11 due to the wedge effect, thereby causing the rotating cam 4. The roller 9 and the rotating drum 10 are meshed and connected as if they were an integral structure, and the rotational force of the motor 1 is transmitted to the pulley body 14 via the clutch mechanism.

Next, the operation of this embodiment will be explained.

When the motor 1 is started from the state shown in FIGS. 1 and 2 in which the roller 9 is free, the rotation shaft 3 of the motor 1 is
The rotary cam 4, which is fitted into the rotary cam 4 and integrated in the rotational direction, begins to rotate in the same way, while the roller 9 and guide wheel 5 maintain the inertia force caused by the previously stopped state. A relative rotational displacement occurs between the wheel 5 and the wheel 5.

That is, when the rotary cam 4 starts rotating, the flat portion 4
The roller 9, which was located approximately in the center of the point a, moves toward the corner 4b, and as the relative rotational displacement increases, the inclination angle of the roller 9 gradually decreases, and in the free state, only the upper end is exposed to the cam. The roller 9, which had been in contact with the surface, now comes into contact with the cam surface over its entire length, as shown in FIGS. 3 and 4. When the roller 9 is brought into pressure contact with the inner peripheral surface of the drum part 11 of the rotary drum 10 by the pressing force of the rotary cam 4, the roller 9 wedges between the rotary cam 4 and the drum part 11, so that the rotary cam 4 The roller 9 and the rotating drum lO are integrated in the rotational direction, whereby the rotational force of the motor l is transmitted to the pulley body 14, and the pulley body 14 rotates in the same direction as the rotating shaft 3.

During normal rotation after starting, the wedge state is maintained and the rotating cam 4, roller 9, and rotating drum 10 rotate together, so that the rotational force of the motor 1 is continuously transmitted to the pulley body 14. As a result, the opening/closing paper 17 is wound around the V groove 18 of the pulley body 14, or the opening/closing paper 17 is fed out from the V@18, thereby automatically opening and closing the curtain.

The above operation is performed in the same manner whether the motor I rotates in the normal direction or in the reverse direction.

On the other hand, when the motor l stops rotating, the rotating cam 4 stops rotating, but the pulley body 14. Rotating drum 10. Since the guide wheel 5 and the roller 9 continue to rotate due to inertia, the roller 9 moves from the corner 4b to the center of the flat portion 4a. As a result, the rotating cam 4
The wedge state caused by the action of the rotating drum 10 is released, the roller 9 becomes free, and the rotating cam 4 and the pulley body 14 are disconnected.

In this case, in order to reliably release the wedged state of the roller 9 caused by the action of the rotating cam 4 and the rotating drum 10, it is preferable to rotate the motor 1 in the reverse direction only for a moment, that is, to eliminate the wedge effect. When the rotary cam 4 is momentarily rotated in the opposite direction to the direction in which the guide wheel 5. Since the roller 9 and the rotary drum 10 maintain the inertia force of the stopped state and the rotational force causes only the drum 4 to rotate in the opposite direction, the wedge state can be easily released.

Next, when the curtain is opened and closed manually with the rotation of the motor 1 stopped and the roller 9 free, an external force is input from the opening/closing paper 17, and the rotating drum 10 is moved together with the pulley body 14. Rotationally driven. However, the roller 9 in the free state is placed in an inclined state on the inclined support surface 17, and cannot rotate freely and transmit power. Only the rotating cam 14 rotates, and no rotational force is transmitted to the rotating cam 4. Therefore, since the motor 1 does not rotate, the load of the motor 1 does not act as a load resistance for opening and closing the curtain, so the opening/closing string 17
can be moved easily by manual operation.

As a result, even if the motor 1 becomes inoperable due to, for example, a power outage, the curtain can be easily opened and closed by manual operation through the released state of the clutch.

8 to 15 show a second embodiment of the present invention.

In this embodiment, a pole 30 is used as the rotating body.

Reference numeral 31 shown in FIG. 8 is a sleeve fixed to the rotating shaft 3 of the motor 1 with a set screw 32, and the sleeve 31 is
As shown in FIGS. 11(a) and 11(b), it consists of a sleeve body having a square shaft portion 33 in which a portion in the axial direction is formed into a square shape,
A rotating cam 34 is fitted onto the square shaft portion 33. The zero-rotating cam 34 has four flat surfaces provided at positions rotationally displaced by 90 degrees from each other, as shown in FIGS. 12(a) and (b). Part 34a
and corner portions 34b at four corners that smoothly continue in an arc shape between adjacent flat portions 34a. The portion 33 is fitted.

As shown in FIGS. 13(a) and 13(b), the guide wheel 35 has four radial holes 36 as in the previous embodiment, and the bottom surface of the hole forms a support surface 37. .

Reference numeral 38 denotes a pulley body in which a drum part 39 and a pulley part 40 are integrally formed, and as shown in FIGS. hole 41 and two holes formed on both sides of this insertion hole 41.
bearing holes 42 are provided.

As shown in FIGS. 15(a) and 15(b), the shaft 44 has a cylindrical body with an outwardly facing flange 45, and the outer rings of two bearings 46 fitted onto the shaft fit into the bearing hole 42.
The pulley main body 38 is rotatably supported on the shaft 44 via both bearings 42. The shaft 44 is fixed to the support plate 21 by screws 47.

The rotating cam 34, the pole 30 and the drum portion 39 that are in contact with the rotating cam 34 are set to have the following relationship.

That is, the dimensions of the rotating cam 34 are as shown in FIG.
The gap between the corner portion 34b and the inner peripheral surface of the drum portion 39 is the pole 3.
The gap between the flat portion 34a and the inner circumferential surface of the drum portion 39 is made larger than the diameter of the pole 30.

The rest of the structure is the same as that of the embodiment described above, and even with this structure, the same effects as those of the embodiment described above can be obtained. That is, when the pawl 30 moves outward through the radial hole 36 from the flat portion 34a to the corner portion 34b due to the rotation of the rotary cam 34, the pawl 30 is pressed against the inner peripheral surface of the drum portion 39 by the pressing force of the rotary cam 34. The rotating cam 34. Pole 30 and pulley body 38
are integrally connected, and therefore, the rotational force of the motor 1 is transmitted to the pulley body 38 via the clutch mechanism configured as described above.

A third embodiment of the present invention is shown in FIGS. 16 and 17.

In this embodiment, the rotating cam 50 is arranged outside the drum section 39. Therefore, in this embodiment, the rotating cam 5
0 is formed into a substantially ring shape, and the same number of convex portions 51 as the number of rollers 9 are provided on the inner peripheral surface at equal angular intervals, and both surfaces of each convex portion 51 are made continuous in an arc shape to form a cam surface. ing. Further, an inclined supporting surface 52 is provided on the bottom surface of the rotary cam 50, and this supports the roller 9 in an outwardly inclined manner. is in contact with the surface. 53 is a guide wheel that supports the roller 9 so that it can be tilted and moved slightly.

The other configurations and operations are the same as those of the embodiment described above, and the same effects as those of the embodiment described above can also be obtained by configuring it in this way.

In addition, in the above embodiment, an example in which a pole and a roller are used as the rotating body is explained, but the present invention is not limited to this, and other shapes such as a barrel-shaped roller can also be applied. be able to.

Furthermore, in the first and second embodiments described above, the rotating cam 4
, 34 are square, but the shape is not limited to this. For example, various polygons such as a triangle or a pentagon can be applied.

[Effects of the Invention] As described above, according to the present invention, a rotary cam connected to a rotating shaft of a motor, a pulley body that rotates integrally with a drum section disposed coaxially with the rotary cam, and a rotary cam and a The configuration includes a guide wheel interposed between the drum part and a rotary body rotatably held in a radial hole of the guide wheel, so that the rotational force of the motor during forward and reverse rotation is reduced.
It is possible to tilt or move the rotating body and reliably transmit the information to the pulley body, and it is possible to produce a bidirectional clutch with a simple structure and reliable opening/closing operation at a relatively low cost.

In addition, since the clutch mechanism is always reliably released when the motor is stopped, the motor will not become a load resistance even if a failure occurs in the electrical system of the motor, etc., and the clutch mechanism can be operated manually from the opening/closing string. Also, it is possible to provide a two-way clutch for a curtain opening/closing device that can open and close the curtain lightly and easily.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a first embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a main part of Fig. 1 for explaining the operation of the clutch. FIG. 4 is a sectional view of a portion corresponding to FIG. 2, and FIGS. 5(a) and (b).
) shows the rotary cam according to the first embodiment;
a) is a cross-sectional view, FIG. 6(b) is a plan view, and FIG. 6(a), (
Figure b) also shows the guide wheel, and figure (a)
is a sectional view, FIG. 7(b) is a plan view, and FIGS. 7(a) and (b)
Similarly, FIG. 8 shows a rotating drum; FIG. 8(a) is a sectional view, FIG. 8(b) is a plan view, FIG. Cross-sectional view taken along line B-B in the figure, 1st
0 is a sectional view of a portion corresponding to FIG. 9 for explaining the operation of the clutch, and FIGS. 11(a) and 11(b) show a sleeve according to the second embodiment. ) is a cross-sectional view,
Figure 12 (b) is a plan view, and Figures 12 (a) and (b) are the same.
This figure shows a rotating cam, and the figure (a) is a cross-sectional view, and the figure (b) is a cross-sectional view.
) is a plan view, FIGS. 13(a) and 13(b) also show the guide wheels, FIG. 13(a) is a sectional view, and FIG. 13(b)
14(a) and 14(b) similarly show the pulley body, FIG. 14(a) is a cross-sectional view, FIG. 15(b) is a plan view, and FIGS. similarly shows the shaft; figure (a) is a cross-sectional view, figure (b) is a plan view,
FIG. 16 is a sectional view showing the third embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line CC in FIG. 16. 1: Motor 4, 34, 50: Rotating cam 4a, 34a: Flat part 4b, 34b: Corner part 5.35, 53 Ni guide wheel 13.38: Radial hole 7.52: Inclined support surface 9
: Roller (rotating body) 10: Rotating drum 11.39 Ni drum part 12: Radial hole 14.38 : Pulley body 17: Opening/closing string 30: Pole (rotating body) 31 Ni sleeve 37: Support surface 44: Shaft 51:
convex part

Claims (4)

[Claims] (1) A rotating cam connected to the rotating shaft of a vertically installed motor, a pulley body having a drum section coaxially provided with an appropriate gap between the rotating cam, and a plurality of pulleys interposed in the gap. and a guide wheel that tilts and rotatably holds these rotating bodies; A cam portion is provided to change the inclination angle of the rotating body and press it against the drum portion to transmit the rotational force of the motor to the pulley body, and the pulley body has a pulley groove around which a curtain opening/closing string is wound. A two-way clutch for a curtain opening/closing device characterized by being provided with a two-way clutch. (2) A rotating cam connected to the rotating shaft of a vertically installed motor, a pulley body having a drum section coaxially provided with an appropriate gap between the rotating cam, and a plurality of pulleys interposed in the gap. and a guide wheel for movably and rotatably holding these rotating bodies; A cam part is provided to move the rotating body and press it against the drum part to transmit the rotational force of the motor to the pulley body, and the pulley body is provided with a pulley groove around which a string for opening and closing the curtain is wound. A two-way clutch for curtain opening/closing devices featuring: (3) The utility model characterized in that the rotating cam is arranged inside the drum part, and a cam surface having a number of corners equal to the number of the rotating bodies is provided on the outer periphery of the rotating cam. A bidirectional clutch for a curtain opening/closing device according to claim 1 or 2 of the registered claims. (4) The rotating cam is arranged outside the drum part, and the inner circumference of the rotating cam is provided with a cam surface having a number of convex parts equal to the number of the rotating bodies. A bidirectional clutch for a curtain opening/closing device according to claim 1 or 2 of the patent registration claim.