JP2022001784A - Rotation control device - Google Patents

Abstract

To compactly configure a rotation control device, which is reciprocally switchable between a state in which an input member and an output member are integrally connected to each other and a state in which the connection is released and the output member can idle relative to the input member, and in which predetermined resistance torque is applied to the input member when the input member is rotated in one direction, and to prevent rotation of an input shaft from being hindered with waste such as dirt and dust adhering to the input shaft.SOLUTION: A mechanism which is reciprocally switchable between a state in which an input member 6 and an output member 8 are integrally connected to each other and a state in which such connection is released and the output member 8 can idle relative to the input member 6, and a mechanism (resistance torque applying means 74) which applies a predetermined resistance torque to the input member 6 when the input member is rotated in one direction, are housed in a common housing 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotation control device capable of switching between a state in which an input member and an output member are integrally connected and a state in which the connection is released and the output member can idle with respect to the input member. be.

A clothes-drying device capable of raising and lowering a rod by an elevating mechanism may be provided on the ceiling inside or outside the house in recent years (for example, Patent Document 1 below). In such a clothes-drying device, the rod is held in a storage position that is charged and separated upward from the floor when the laundry is not suspended, and is forcibly pulled from the storage position when the laundry is suspended. In some cases, the laundry is lowered and moved up and down by the elevating mechanism in a suspended state so as to be held at an arbitrary height position (intermediate position).

By the way, as a device for controlling the rotation transmission between the input member and the output member, the input member and the output member are integrally connected, and the connection is released so that the output member can idle with respect to the input member. A rotation control device that can switch between different states is well known. As an example of such a rotation control device, there is one described in the following Patent Document 2 which has been filed and already patented by the applicant of the present application prior to the present application. The rotation control device disclosed in Patent Document 2 below includes a fixed housing, an input member and an output member arranged inside the housing and rotatable about a common rotation axis, and a retainer. The input member includes an input shaft extending in the axial direction concentrically with a common rotation shaft and a pivot shaft eccentric with respect to the common rotation shaft, and a link member is rotatably fitted to the pivot shaft. The link member is formed with an engaging shaft that is eccentric with respect to the pivot and protrudes in the axial direction, and the retainer is formed with a guide groove that extends in the radial direction and into which the tip of the engaging shaft is fitted. A holding torque is applied to the retainer by the holding torque applying means, and the engaging shaft can move in the radial direction along the guide groove by rotating the input member with respect to the output member. An engaging portion that can be engaged with the engaging shaft is formed on the outer peripheral surface of the output member.

The rotation control device operates as follows. That is, when the engaging shaft of the link member is separated from the engaging portion of the output member (the engaging shaft and the engaging portion are disengaged), the output member slips with respect to the input member. However, the rotation from the output member to the input member is cut off. When the input member rotates from the above state, in the initial state, the input member rotates with respect to the output member, so that the pivot axis moves in the circumferential direction and the engagement shaft moves inward in the radial direction. When the engaging shaft engages with the engaging portion, the input member and the output member are integrally connected, and the rotation of the input member is transmitted to the output member via the link member. After the transmission of rotation from the input member to the output member is completed, the input member rotates in the opposite direction, so that the engaging shaft is separated from the engaging portion (the engaging shaft and the engaging portion are disengaged). ), The output member can slip again with respect to the input member. That is, by operating the input member as required to engage or disengage the engaging shaft and the engaging portion, the state in which the input member and the output member are integrally connected and the above-mentioned integrated connection can be achieved. It is released and the output member can be switched between a state in which the output member can idle with respect to the input member. When the engaging shaft and the engaging portion are engaged, the rotation of the output member is also transmitted to the input member via the link member, and the input member rotates integrally with the output member. That is, the reverse input from the output member to the input member is transmitted.

Further, a resistance torque applying device that applies a predetermined resistance torque to the input member when the input member rotates in one direction is also well known. As an example of such a resistance torque applying device, there is one described in the following Patent Document 3 which has been filed and already patented by the applicant of the present application prior to the present application. The resistance torque applying device disclosed in Patent Document 3 below includes a fixed housing, and a cylindrical one-way clutch is housed inside the housing. A shaft is inserted inside the one-way clutch, and the shaft is allowed to rotate in one direction with respect to this by the one-way clutch, but is restricted from rotating in the opposite direction. A ring member is fitted on the outer peripheral surface of the one-way clutch so as not to rotate relative to each other, and a coil spring is mounted on the outer peripheral surface of the ring member. The coil spring is provided with a hook portion, and the hook portion engages with the housing so that the coil spring cannot rotate with respect to the housing.

The resistance torque applying device operates as follows. That is, when the shaft inserted in the one-way clutch rotates in one direction, no resistance torque is applied to the shaft. This is because the shaft can rotate in one direction with respect to the one-way clutch. On the other hand, when the shaft rotates in the opposite direction, a predetermined resistance torque is applied to the shaft. This is due to the following reasons. Since the shaft cannot rotate in the opposite direction to the one-way clutch, when the shaft tries to rotate in the opposite direction, it tries to rotate integrally with the one-way clutch. When the one-way clutch tries to rotate in the opposite direction, the ring member and the coil spring also try to rotate in the opposite direction together with the shaft and the one-way clutch. Then, since the hook portion of the coil spring is engaged with the housing, the hook portion is relatively pushed by the housing in the direction in which the coil spring loosens due to the above rotation, and the force of the coil spring tightening the ring member resists. This is because it acts as torque. Therefore, when the shaft tries to rotate in the opposite direction, if the rotational torque is less than the above resistance torque, the shaft cannot be held and rotated by this, and if it is more than the above resistance torque, this is the case. The shaft will rotate against it. When the shaft rotates against the resistance torque, the ring member that rotates integrally with the shaft rotates with respect to the coil spring, that is, the outer peripheral surface of the ring member rotates while sliding with respect to the inner peripheral surface of the coil spring.

Japanese Unexamined Patent Publication No. 2014-18216 Japanese Patent No. 6524291 Japanese Patent No. 3592984

If the rotation control device and the resistance torque applying device are arranged in series and the input shaft of the rotation control device is inserted into the one-way clutch of the resistance torque applying device (if the input shaft is a shaft), the engagement is performed. The rod can be forcibly pulled down from the storage position by disengaging the shaft and the engaging portion, and the input member can be rotated by engaging the engaging shaft and the engaging portion. The rod can be moved up and down. Then, when the input member is rotated to move the rod up and down, the rod is held at an arbitrary intermediate position if the rotation of the input member is stopped.

Since the rotation control device and the resistance torque applying device are independent devices, a large installation space is required to arrange these two devices in series. Further, if two independent devices are arranged in series, dust such as dust and dirt may be accumulated between the two devices, which may hinder the rotation of the rotating body of the shaft (input shaft).

The present invention has been made in view of the above facts, and the main technical problem thereof is a state in which the input member and the output member are integrally connected, and a state in which the connection is released so that the output member is connected to the input member. A rotation control device that can be switched between idle states and is given a predetermined resistance torque when the input member rotates in one direction is compactly configured, and dust and dirt are removed. This is to prevent such dust from adhering to the input shaft and hindering its rotation.

As a result of diligent studies, the present inventor has made it possible to switch between a state in which the input member and the output member are integrally connected and a state in which the connection is released and the output member can idle with respect to the input member. It has been found that the above-mentioned main technical problem can be solved by accommodating the mechanism and the mechanism for applying a predetermined resistance torque to the input member when it rotates in one direction in a common housing.

That is, according to the present invention, as a rotation control device that solves the above-mentioned main technical problems, a fixed housing, an input member, an output member, and an output member that are arranged inside the housing and can rotate around a common rotation axis. Equipped with a retainer,
The input member includes an input shaft extending in the axial direction concentrically with the common rotation shaft and a pivot shaft eccentric with respect to the common rotation shaft, and a link member is rotatably fitted to the pivot shaft.
The link member is formed with an engaging shaft that is eccentric to the pivot and protrudes in the axial direction, and the retainer is formed with a guide groove that extends radially and into which the tip of the engaging shaft is fitted. A holding torque is applied to the retainer by the holding torque applying means, and the engaging shaft can move along the guide groove by rotating the input member with respect to the output member.
An engaging portion that can be engaged with the engaging shaft is formed on the outer peripheral surface of the output member, and when the engaging shaft and the engaging portion engage, the input member and the output member are integrally connected. When the engagement of the engaging shaft and the engaging portion is disengaged, the output member can idle with respect to the input member.
Further, a rotation control device is provided inside the housing, further comprising a resistance torque applying means for applying a predetermined resistance torque to the input shaft when the input member rotates in one direction. Provided.

Preferably, the engaging portion is a groove extending in the axial direction. It is preferable that the resistance torque applying means does not apply the resistance torque to the input shaft when the input member rotates in the opposite direction. It is preferable that a plurality of the pivots are provided at equal intervals in the circumferential direction, and the link member is fitted to each of the plurality of pivots. In this case, the number of the engaging portions is an integral multiple of the number of the pivots, and the engaging portions may be provided at equal intervals in the circumferential direction. Preferably, the holding torque applying means is a wave spring.

In the rotation control device of the present invention, a mechanism capable of switching between a state in which the input member and the output member are integrally connected and a state in which the output member can idle with respect to the input member, and an input member are provided. By arranging a mechanism that applies a predetermined resistance torque to this when rotating in one direction in a common housing, compared to the case where devices equipped with each mechanism are separately prepared and arranged in series. Therefore, it is possible to make the housing compact by at least the thickness of the wall arranged in the axial direction of each housing. Further, since both mechanisms are arranged in a single housing, it is possible to prevent dust, dust, and other debris from adhering to the input shaft.

The block diagram which shows the preferable embodiment of the rotation control apparatus configured according to this invention. FIG. 3 is a perspective view showing each component of the rotation control device shown in FIG. 1 in an exploded manner. The figure which shows the housing of the rotation control device shown in FIG. 1 by itself. The figure which shows the input disk of the input member of the rotation control device shown in FIG. 1 by itself. The figure which shows the link member of the rotation control device shown in FIG. 1 by itself. The figure which shows the retainer of the rotation control device shown in FIG. 1 by itself. The figure which shows the output plate of the output member of the rotation control device shown in FIG. 1 by itself. The figure which shows the state which rotated the input member in one direction with respect to the output member from the state shown in FIG. The figure which shows the state which rotated the input member in the opposite direction with respect to the output member from the state shown in FIG.

Hereinafter, description will be made in more detail with reference to the accompanying drawings illustrating preferred embodiments of the rotation control device configured according to the present invention.

Explaining with reference to FIGS. 1 and 2, the rotation control device, which is configured according to the present invention and is indicated by the entire number 2, has a fixed housing 4 and a common rotation shaft o arranged inside the housing 4. It includes a rotatable input member 6, an output member 8, and a retainer 9 as a center. Here, unless otherwise specified, "one side in the axial direction" and "the other side in the axial direction" in the following description are referred to in the same figure as "one side in the axial direction" with reference to the state shown in the central longitudinal section of FIG. The left side and the "other side in the axial direction" refer to the right side in the figure.

Explaining with reference to FIG. 3 together with FIGS. 1 and 2, the housing 4 is made of metal and has a circular end plate 10 perpendicular to a common rotation axis o and an axial direction from the outer peripheral edge of the end plate 10. It is a cup shape with a cylindrical outer peripheral wall 12 extending toward the other side. A circular through hole 14 through which an input shaft described later is inserted is formed in the center of the end plate 10. On the outer peripheral surface of the opening end of the outer peripheral wall 12, two substantially triangular flange portions 16 extending outward in the radial direction are formed so as to face each other in the radial direction. A hole 18 penetrating in the axial direction is formed in the central portion of the flange portion 16, and the housing 4 is fixed to an external member (not shown) by inserting an appropriate fixing tool such as a bolt into the hole 18. .. Inside the outer peripheral wall 12, three cylindrical space portions 20a to 20c having different diameters are provided in series coaxially with a common rotation axis o. The space portions 20a to 20c are arranged in this order from one side in the axial direction toward the other side in the axial direction, and their respective diameters are set to increase in the above order. A hook groove 22 extending in the axial direction by locally increasing the inner diameter of the outer peripheral wall 12 is formed at a predetermined angle position in the circumferential direction of a portion of the inner peripheral surface of the outer peripheral wall 12 where the space portion 20a is provided. .. A hook portion of a coil spring, which will be described later, is inserted into the hook groove 22. An annular mounting groove 24 is formed on the inner peripheral surface of the opening end of the outer peripheral wall 12, and a shield plate (see FIG. 2) represented by the number 26 is fitted into the mounting groove 24. As a result, the inside of the housing 4, that is, the space portions 20a to 20c are closed. The shield plate 26 has a disk shape, and a circular through hole 28 through which an output shaft described later is inserted is formed in the center.

Explaining with reference to FIGS. 1 and 2, the input member 6 is made of metal and includes an input disk 30 arranged in the space 20b of the housing 4, and is centered on the input disk 30. Is formed with a central hole portion 31 having a non-circular cross section penetrating in the axial direction. The input member 6 also includes an input shaft 32 extending in the axial direction concentrically with the common rotation shaft o. In the illustrated embodiment, the input shaft 32 is a solid shaft-shaped member having a circular cross section and includes a large diameter portion 34 and a small diameter portion 36, and the tip portion of the small diameter portion 36 has an input disk 30 having a cross-sectional shape. A protruding portion 38 corresponding to the cross-sectional shape of the central hole portion 31 formed in the above is formed. The input shaft 32 is connected to the input disk 30 by inserting the protruding portion 38 into the central hole portion 31 from one side in the axial direction. If desired, the input shaft 32 may be integrally formed with the input disk 30. A resistance torque applying means described later is fitted to such an input shaft 32. The input member 6 also includes a pivot 42 eccentric with respect to the common axis of rotation o. In the illustrated embodiment, the pivots 42 are axial protrusions protruding in the axial direction at the radial intermediate portion of the other side surface in the axial direction of the input disk 30, and three shafts 42 are arranged at equal intervals in the circumferential direction. .. A cylindrical fitting wall 44 that surrounds the central hole 31 and projects in the axial direction is also formed in the center of the other side surface of the input disk 30 in the axial direction.

The link member represented by the number 46 is rotatably fitted to the pivot 42 of the input member 6. In the central longitudinal section of FIG. 1 (the same applies to FIGS. 8 and 9), the link member 46 is shown with a light ink so that it can be easily understood. The link member 46 is fitted to each of the three pivots 42. Explaining with reference to FIG. 5 together with FIGS. 1 and 2, the link member 46 is made of metal and includes an oval-shaped link piece 48 arranged perpendicular to the axial direction. A shaft hole 50 through which the pivot 42 is inserted is formed at one end of the link piece 48. If desired, the pivot 42 formed in the input member 6 may be used as a shaft hole, and the shaft hole 50 formed in the link member 46 may be used as a shaft protrusion protruding in the axial direction. An engaging shaft 52 protruding in the axial direction is formed at the other end of the link piece 48 (that is, a position eccentric with respect to the pivot 42). The engaging shaft 52 is a shaft protrusion having a circular cross section.

Explaining with reference to FIG. 6 together with FIGS. 1 and 2, the retainer 9 is a metal substantially disk-shaped member, and is arranged in the space portion 20c of the housing 4. A circular through hole 54 through which an output shaft described later is inserted is formed in the center of the retainer 9. A circular recess 56 is formed in the central region of one side surface of the retainer 9 in the axial direction. On one side surface of the retainer 9 in the axial direction, three guide grooves 58 extending linearly in the radial direction are further formed on the radial outer side of the recess 56 at equal angular intervals in the circumferential direction. Both ends in the radial direction of the guide groove 58 are open, and the tip end portion of the engagement shaft 52 of the link member 46 is fitted into the guide groove 58. Then, when the input member 6 rotates with respect to the output member 8 as described later, the engagement shaft 52 can move along the guide groove 58 by the link mechanism. An annular groove 60 is formed on the outer peripheral edge portion of the other side surface of the retainer 9 in the axial direction. Here, the retainer 9 is given a holding torque by the holding torque applying means. In the illustrated embodiment, the holding torque applying means is a metal wave spring 62, which is arranged in the annular groove 60 of the retainer 9 by friction with the shield plate 26 press-fitted into the housing 4. A holding torque is applied to the retainer 9.

Explaining with reference to FIG. 7 together with FIGS. 1 and 2, the output member 8 is made of metal and includes an output plate 63 having a substantially disk shape. The output plate 63 is fitted into the recess 56 in a state of being rotatable with respect to the retainer 9. A circular recess 64 is formed in the central region of one side surface in the axial direction of the output plate 63, and the tip of the fitting wall 44 formed in the input member 6 is fitted in the recess 64 in a relatively rotatable state. It is crowded. A central hole 65 having a non-circular cross section is formed in the center of the output plate 63 so as to penetrate in the axial direction. The output member 8 also includes an output shaft 66 extending in the axial direction concentrically with the common rotation shaft o. In the illustrated embodiment, the output shaft 66 is a solid shaft-shaped member having a circular cross section, and a protruding portion 68 having a non-circular cross section is formed at the tip end portion. The output shaft 66 is connected to the output plate 63 by inserting the protruding portion 68 into the central hole portion 65 from the other side in the axial direction. If desired, the output shaft 66 and the output plate 63 may be integrally formed. An engaging portion 72 that can be engaged with the engaging shaft 52 of the link member 46 is formed on the outer peripheral surface of the output member 8 (output plate 63). In the illustrated embodiment, the engaging portion 72 is a groove extending in the axial direction, which is formed by locally reducing the outer diameter of the output plate 63. Further, the cross-sectional shape of the engaging portion 72, which is a groove, corresponds to the cross-sectional shape of the engaging shaft 52, and the engaging shaft 52 and the engaging portion 72 are in surface contact with each other. Further, a plurality of engaging portions 72 are provided at equal angular intervals in the circumferential direction. The number of engaging portions 72 is preferably an integral multiple of the number of pivots 42 (the number of link members 46), and nine are provided in the illustrated embodiment.

As shown in FIGS. 1 and 2, a resistance torque applying means 74 that applies a predetermined resistance torque to the input shaft 32 when the input member 6 rotates in one direction is further provided inside the housing 4. .. In the illustrated embodiment, the resistance torque applying means 74 is arranged in the space 20a of the housing 4, and is fitted to the outer peripheral surface of the input shaft 32 so that the input shaft 32 is clockwise (right of the central vertical cross section of FIG. 1). Seen from the direction. The same shall apply hereinafter.) A one-way clutch 76 and a one-way clutch 76 that rotate integrally with the input shaft 32 but spin counterclockwise when the input shaft 32 rotates counterclockwise. It has a ring member 78 that is fitted to the outer peripheral surface of the ring member 78 so as not to rotate relative to each other, and a coil spring 80 that is mounted on the outer peripheral surface of the ring member 78. A hook portion 82 extending in the radial direction is provided at the other end in the axial direction of the coil spring 80, and the hook portion 82 enters the hook groove 22 formed in the housing 4. As a result, the coil spring 80 cannot rotate with respect to the housing 4. Since the configuration and operation of the resistance torque applying means 74 described above are the same as those of the resistance torque applying device disclosed in Patent Document 3, detailed description thereof will be omitted. In the illustrated embodiment, since the resistance torque applying means 74 includes the one-way clutch 76, when the input member 6 rotates in the counterclockwise direction (counterclockwise direction), the input shaft 32 has the above-mentioned predetermined resistance torque. Is not given.

Subsequently, the operation of the rotation control device of the present invention will be described with reference to FIGS. 8 and 9 together with FIG.
First, in the state shown in FIG. 1, as shown in the BB cross section of the figure, the engaging shaft 52 of the link member 46 is located in the radial intermediate portion in the guide groove 58 formed in the retainer 9. , It is separated from the engaging portion 72 formed on the outer peripheral surface of the output member 8. That is, the engagement of the engaging shaft 52 and the engaging portion 72 is disengaged, and even if the output member 8 (output shaft 66) rotates in either the clockwise direction or the counterclockwise direction in such a state, The output member 8 only idles with respect to the input member 6, and rotation (reverse input) is not transmitted to the input member 6.

When the input shaft 32 rotates clockwise (when viewed from the right side of the central vertical cross section in the figure) from the state shown in FIG. 1, the input member 6 with respect to the retainer 9 and the output member 8 in the initial state. Rotate clockwise. At this time, the tip of the engagement shaft 52 of the link member 46 is fitted into the guide groove 58 formed in the retainer 9, and the input member 6 rotates with respect to the output member 8, so that the engagement shaft 52 becomes the guide groove 58. When the pivot 42 moves clockwise due to the rotation of the input member 6, due to the holding torque being applied to the retainer 9 by the wave spring 62 (holding torque applying means). , The link piece 48 rotates counterclockwise in the BB cross section of the figure about the pivot 42, and the engaging shaft 52 moves radially inward in the guide groove 58. When the engaging shaft 52 moves radially inward in the guide groove 58 and engages with the engaging portion 72 of the output member 8 as shown in FIG. 8, the input member 6 and the output member 8 are integrally connected. .. At this time, the link member 46 and the retainer 9 are also integrally connected to the input member 6 and the output member 8.

When the input member 6 or the output member 8 tries to rotate clockwise from the state shown in FIG. 8, the input shaft 32 integrated with the input member 6 also tries to rotate clockwise. Therefore, the input shaft 32 has a resistance torque applying means. A predetermined resistance torque is applied by 74. Therefore, in order for the input member 6 and the output member 8 to rotate clockwise, it is required that the rotational torque applied to the input member 6 or the output member 8 is equal to or higher than the predetermined resistance torque. In other words, the input member 6 and the output member 8 can rotate if the clockwise rotation torque applied thereto is equal to or more than the predetermined resistance torque, but does not rotate if the rotational torque is less than the predetermined resistance torque (input). The member 6 and the output member 8 are held by the resistance torque applying means 74). In the illustrated embodiment, since the engaging portion 72 is a groove extending in the axial direction, the engagement between the engaging shaft 52 and the engaging portion 72 is strong. Further, in the illustrated embodiment, since the engaging shaft 52 and the engaging portion 72 can be surface-contacted, the engagement between the two is strong. Therefore, even if the rotational torque applied to the input member 6 or the output member 8 is large, the engagement of the engaging shaft 52 and the engaging portion 72 is not unexpectedly disengaged, and the input member 6 and the output member 8 are not disengaged. Are reliably rotated or held together.

When the input member 6 rotates counterclockwise to a required extent from the state shown in FIG. 8, the engaging shaft 52 moves radially outward in the guide groove 58 and is disengaged from the engaging portion 72. It returns to the state shown in.

When a counterclockwise rotational torque is applied to the output member 8 from the state shown in FIG. 8, since the engaging shaft 52 and the engaging portion 72 are engaged, the output member 8 is transferred to the input member 6. Rotation (reverse input) is transmitted. At this time, the resistance torque is not applied to the input shaft 32 integrated with the input member 6 by the resistance torque applying means 74.

On the other hand, even when the input shaft 32 rotates counterclockwise from the state shown in FIG. 1, the input member 6 rotates counterclockwise with respect to the retainer 9 and the output member 8 in the initial state, and FIG. When the engaging shaft 52 and the engaging portion 72 are engaged as shown in the above, the input member 6 and the output member 8 are integrally connected. If the input member 6 or the output member 8 rotates counterclockwise from the state shown in FIG. 9, both rotate in the counterclockwise direction as a unit. At this time, the resistance torque is not applied to the input shaft 32 by the resistance torque applying means 74.

When the input member 6 rotates clockwise to a required degree from the state shown in FIG. 9, the engaging shaft 52 moves radially outward in the guide groove 58 and is disengaged from the engaging portion 72. It returns to the state shown.

When a clockwise rotational torque is applied to the output member 8 from the state shown in FIG. 9, the input member 6 is an output member due to the engagement between the engaging shaft 52 and the engaging portion 72. The resistance torque applied by the resistance torque applying means 74 is applied to the input shaft 32 integrated with the input member 6 in order to rotate in the clockwise direction together with the input member 6. Therefore, when a clockwise rotational torque is applied to the output member 8 in the state shown in FIG. 9, if the rotational torque is equal to or greater than the resistance torque provided by the resistance torque applying means 74, the output member 8 to the input member 6 The rotation to (reverse input) is transmitted, and if it is less than the above resistance torque, the rotation (reverse input) from the output member 8 to the input member 6 is not transmitted (the input member 6 and the output member 8 are subjected to the resistance torque applying means 74). Will be retained).

Therefore, for example, if the rotation control device of the present invention is incorporated in a clothes drying device on which the rod can be raised and lowered, the input member 6 (input shaft 32) is connected to the manual handle, and the output member 8 (output shaft 66) is connected to the raising and lowering mechanism of the rod. When the engagement between the engaging shaft 52 and the engaging portion 72 is disengaged, the rod can be manually moved, and the engaging shaft 52 and the engaging portion 72 are engaged with each other. Can move the rod up and down by rotating the input shaft 32 with the manual handle.
At this time, the resistance torque applying means in the rotation control device of the illustrated embodiment does not apply resistance torque to the input shaft when the input member rotates in the opposite direction, so that the input shaft 32 is rotated with a light force. Can be done. Further, when the operation of the manual handle is stopped, the resistance torque applying means 74 applies a predetermined resistance torque to the input shaft 32 even when the rod is hung with laundry and a load is applied. This prevents the rod from descending.

In the rotation control device of the present invention, a mechanism capable of switching between a state in which the input member and the output member are integrally connected and a state in which the output member can idle with respect to the input member, and an input member are provided. By arranging a mechanism that applies a predetermined resistance torque to this when rotating in one direction in a common housing, compared to the case where devices equipped with each mechanism are separately prepared and arranged in series. Therefore, it is possible to make the housing compact by at least the thickness of the wall arranged in the axial direction of each housing. Further, since both mechanisms are arranged in a single housing, it is possible to prevent dust, dust, and other debris from adhering to the input shaft.

Although the rotation control device configured according to the present invention has been described in detail with reference to the attached drawings, the present invention is not limited to the above-described embodiment, and appropriate modifications are made without departing from the present invention. And can be changed. For example, in the illustrated embodiment, the resistance torque applying means does not apply resistance torque to the input shaft when the input member rotates in the opposite direction, but does not apply resistance torque to the input shaft when the input member rotates in the opposite direction. A resistance torque may be applied. In this case, the resistance torque applying means is a well-known bidirectional torque limiter using a coil spring or a so-called ring spring (for example, Japanese Patent Application Laid-Open No. 10-110739 and Japanese Patent Application Laid-Open No. 10-110739 which were filed and patented prior to the present application by the applicant of the present application. It may be the one described in Japanese Patent Application Laid-Open No. 2018-44573). Further, in the illustrated embodiment, the holding torque applying means is a wave spring, but instead of this, a well-known friction member such as a leaf spring may be used. Furthermore, in the illustrated embodiment, each component except the wave spring is made of metal, but may be made of synthetic resin depending on the intended use (for example, light load).

2: Rotation control device 4: Housing 6: Input member 8: Output member 9: Retainer 32: Input shaft 42: Pit shaft 46: Link member 52: Engagement shaft 58: Guide groove 62: Wave spring (holding torque applying means)
72: Engaging portion 74: Resistance torque applying means

Claims (6)

It includes a fixed housing and an input member, an output member, and a retainer that are arranged inside the housing and can rotate around a common rotation axis.
The input member includes an input shaft extending in the axial direction concentrically with the common rotation shaft and a pivot shaft eccentric with respect to the common rotation shaft, and a link member is rotatably fitted to the pivot shaft.
The link member is formed with an engaging shaft that is eccentric to the pivot and protrudes in the axial direction, and the retainer is formed with a guide groove that extends radially and into which the tip of the engaging shaft is fitted. A holding torque is applied to the retainer by the holding torque applying means, and the engaging shaft can move along the guide groove by rotating the input member with respect to the output member.
An engaging portion that can be engaged with the engaging shaft is formed on the outer peripheral surface of the output member, and when the engaging shaft and the engaging portion engage, the input member and the output member are integrally connected. When the engagement of the engaging shaft and the engaging portion is disengaged, the output member can idle with respect to the input member.
A rotation control device further comprising a resistance torque applying means for applying a predetermined resistance torque to the input shaft when the input member rotates in one direction inside the housing. The rotation control device according to claim 1, wherein the engaging portion is a groove extending in the axial direction. The rotation control device according to claim 1 or 2, wherein the resistance torque applying means does not apply the resistance torque to the input shaft when the input member rotates in the opposite direction. The rotation control device according to any one of claims 1 to 3, wherein a plurality of the pivots are provided at equal intervals in the circumferential direction, and the link member is fitted to each of the plurality of pivots. .. The rotation control device according to claim 4, wherein the number of the engaging portions is an integral multiple of the number of the pivots, and the engaging portions are provided at equal angular intervals in the circumferential direction. The rotation control device according to any one of claims 1 to 5, wherein the holding torque applying means is a wave spring.

Images