JP6542953B1 - Rotation control device capable of switching the rotation state of a rotating body - Google Patents

Abstract

An operation amount when moving an operating procedure connected to a cam in a circumferential direction and operating the operation procedure is large. Therefore, when operating with a motor, power consumption increases. In a rotation control device that controls the rotation state by switching the position of an operation means, the amount of operation of the operation means is reduced. SOLUTION: A cross section of a cam 8 is formed into a shape in which a fan or a part on one side in a circumferential direction of the fan which spreads outward in the radial direction is removed and an arc surface centering on a rotation center is formed on the outer peripheral surface. Thus, the amount of operation of the operation means is reduced, and the state of the rotating body can be stably held. [Selected figure] Figure 1

Description

  The present invention relates to a rotation control device capable of switching the rotation state of a rotating body by the operation of operation means.

  The caster, which is a small wheel, is attached to a truck for carrying luggage, carryback, etc., in order to enable smooth movement, and the caster is a cabinet, chair, nursing bed, etc. that frequently move around the installation location The furniture is also used regularly. In the case where the caster is mounted, for example, a stopper is often provided to restrain the caster in a non-rotatable state so that the mounted cart does not cause an unexpected start when loading or unloading a load or the like.

  The stopper has a function of switching between a state allowing rotation of a rotating body such as a caster and a state preventing rotation, and is a kind of rotation control device. As such a stopper, a friction plate or the like is pressed against a caster or a rotating body fixed thereto to make it impossible to rotate, or a gear-like holding member provided with a large number of concavo-convex portions is fixed to the caster There is known a device in which a fixed side member is engaged with a locking member and fixed so as not to rotate.

  The applicant of the present application has proposed the stopper described in Patent Document 1 as a stopper to be installed on a caster or the like. This is an application of the principle of a so-called roller type one-way clutch in which the rotating body is stopped by the biting action of a roller disposed in a wedge-shaped space, and this stopper will be described with reference to FIG. FIG. 11 is a cross-sectional view showing the structure of the stopper.

  As described with reference to FIG. 11, the rotating body RS is installed in a state surrounded by the fixing member FM. The fixed member FM is provided with six space portions S in which the cam surface CS in which the distance X with the outer periphery of the rotating body RS changes in the circumferential direction, that is, six space portions forming a bowl-like cross section S is set such that the directions in which the distance X increases in mutually adjacent space portions S are opposite to each other. And the adjacent space part S comprises a pair of combination space part PS, and this combination space part PS is arrange | positioned at intervals in the circumferential direction on the outer periphery of rotary body RS. In each of the space portions S, the rolling elements RB pressed by the spring SP in the direction in which the distance X decreases are installed, and in the middle of the combined space portion PS, the distance X increases the rolling elements RB. A cam C is provided to move in the direction. A passive gear RG is fixed to each of the cams C, and the cam C is changed in posture by operating means CM having a drive gear AG meshing with the passive gear RG. The operation means CM includes a lever portion L, and by operating the lever portion L, it can be moved between the one-side operation position shown in FIG. 11A and the other-side operation position shown in FIG.

  When the operation means CM is in the one-side operation position, as shown in FIG. 11A, the cam C is separated from the rolling element RB, and the rolling element RB reduces the distance X by the spring force of the spring SP. Positioned in the direction of movement. Then, the rolling element RB meshes with the cam surface CS and the rotating body RS, and the rotating body RS can not rotate (bidirectional lock state). On the other hand, when the operation means CM is in the other-side operation position, as shown in FIG. 11 (b), the direction in which the distance C is increased by the cam C resisting the rolling force RB against the spring force of the spring SP. Move to Then, the biting of the rolling elements RB is released, and the rotating body RS becomes rotatable (bidirectional free state).

  The rotation control device is not limited to the stopper as described above in which the rotation of the rotating body can be switched between the bidirectional locking state and the bidirectional free state, and the rotation of the rotating body is in the bidirectional locking state and one direction free state A device that can switch between the two, or a device that can reverse the forward or reverse direction in which the rotation of the rotating body is permitted, or the rotation of the rotating body can be switched between the two-way free state and the one-way locked state Devices are also included. As such a device, the applicant of the present application has also invented a device described in Patent Document 2. This is a modification of the number and arrangement of cam lobes CR in the cam C of the stopper shown in FIG. That is, in the drive cam AC of the stopper shown in FIG. 11, two cam lobes CR are disposed at an angular interval of 180 degrees, but only one is disposed as shown in FIG. 12 (a). Thus, the rotation of the rotating body can be switched between the bidirectional lock state and the one-way free state. Further, as shown in FIG. 12B, by arranging the two cam lobes CR at an angle interval of 90 degrees, it becomes an apparatus capable of reversing either the forward or reverse direction in which the rotation of the rotating body is permitted. . Furthermore, as shown in FIG. 12 (c), by arranging the three cam lobes CR at an angular interval of 90 degrees, the rotation of the rotating body can be switched between the bidirectional free state and the unidirectional locked state. It becomes.

Patent No. 6064067 Patent No. 6212599

The rotation control device such as the stopper described above can easily switch the rotation state of the rotating body by the operation of the operation means. However, in the above-described rotation control device, as shown in FIG. 11, since the cross section of the cam C is a so-called egg type, the operating means connected to the cam is moved in the circumferential direction to operate it. After the cam C abuts on the outer peripheral surface of the rolling element RB, the rotation angle until the biting of the rolling element RB between the cam surface CS and the rotating body RS is released, that is, the operation amount of the operating means is large. Therefore, when the operating means is operated by a motor, the power consumption of this motor is increased.
The object of the present invention is to reduce the amount of operation of the operating means in a rotation control device that controls the rotational state by switching the position of the operating means connected to the cam using a mechanism similar to the stopper of FIG.

In view of the above problems, the present invention is, in a to Turkey the shape obtained by removing part of the circumferential side of the fan or fan extending toward the cross-section of the cam radially outward, reducing the operation amount of the operation means those were good Unishi that. That is, the present invention
“The rotation control device is capable of switching the rotation state of the rotating body by the operation of the operation means.
A fixing member provided around the outer periphery of the rotating body,
The fixed member is provided with a plurality of spaces formed with a cam surface whose distance from the outer periphery of the rotating body changes in the circumferential direction, and the plurality of spaces increase the distance in adjacent spaces. And the adjacent spaces form a pair of combined space parts, and a plurality of the combined space parts are arranged on the outer periphery of the rotating body,
A rolling element pressed by a spring in the direction in which the distance decreases is installed in each of the space sections, and the rolling element is moved in the direction in which the distance increases in the middle of the combined space section. The cam is installed,
A passive gear is fixed to each of the cams, and the operation means is provided with a drive gear that meshes with the passive gear and changes the attitude of the cam.
The cross section of the cam has a shape in which a part of a fan or a circumferential one side of the fan which spreads radially outward is removed,
The operation means is circumferentially movable between a plurality of positions, and when the operation means is at any of the plurality of positions, the rolling element is engaged between the cam surface and the rotating body. When the operation means is in any other position of the plurality of positions, the cam abuts on the rolling element to release the biting of the rolling element. The rotating body becomes rotatable. "
It has become a rotation control device characterized in that.

The plurality of combined space portions may be disposed at equal intervals on the outer periphery of the rotating body.
Preferably, the operation means and the fixing member are provided with an engagement portion which holds the position of the operation means by elastically moving over and engaging.
Preferably, a circular arc surface centered on the rotation center is formed on the outer peripheral surface of the cam.

In the rotation control device of the present invention, the fixed member surrounding the rotating body is provided with a plurality of space portions in which the cam surfaces whose distance from the outer periphery of the rotating body changes in the circumferential direction are formed. Adjacent spaces form a pair of combined spaces, and in each of the spaces, a rolling element pressed by a spring in the direction of decreasing the distance is installed, and in the middle, the rolling element is The cam is installed to move in the direction of increasing A passive gear is fixed to each of the cams, and the attitude of the cam can be changed by operating means provided with a drive gear meshing with the passive gear. The operating means is movable between a plurality of positions .

The operation of the rotation control device of the present invention is also basically the same as that of the conventional rotation control device. When the position of the operation means is at any one of the above-mentioned positions, that is, in the state shown in FIG. 1 described later, the cam is separated from the rolling element and the rolling element is in the direction of decreasing the distance by the spring. As it is pressed and bites between the cam surface and the rotating body, the rotating body becomes non-rotatable. On the other hand, when the position of the operating means is at any one of the above-mentioned plural positions, that is, in the state shown in FIG. 2 described later, the cam abuts on the rolling element and resists the pressing force of the spring. By moving in the direction in which the distance increases, the rotating body becomes rotatable.
Here, in the rotation control device according to the present invention, since the cross section of the cam contacting the rolling element has a shape in which a fan or a part of one side in the circumferential direction of the fan spreads outward in the radial direction is removed The cam can be brought into contact with the rolling element to release the biting of the rolling element by moving the means slightly in the circumferential direction. Therefore, when the operating means is operated by a motor, it is possible to reduce the power consumption of the motor.

FIG. 6 is a diagram showing the overall structure of an embodiment in which the rotation control device of the present invention is configured to be able to switch between a bidirectional lock state and a bidirectional free state. It is a figure of the state which operated the operation means in FIG. It is an assembly drawing of the components which comprise the rotation control apparatus shown in FIG. It is a figure which shows the structure of the fixing member of the rotation control apparatus shown in FIG. It is a single-piece figure of the rotary body of the rotation control apparatus shown in FIG. It is an individual figure which expands and shows the cam of the rotation control apparatus shown in FIG. It is a single-piece figure of the operation means of the rotation control apparatus shown in FIG. It is a figure which expands and shows the modification of the combination of an operation means and a fixed disc. It is a figure which expands and shows the further modification of the combination of an operation means and a fixed disc. It is a figure which shows the modification of the cam shown in FIG. It is a figure which shows the structure of the conventional rotation control apparatus which the applicant proposed. It is a figure which shows the modification of the cam in the rotation control apparatus shown in FIG.

  Hereinafter, the rotation control device of the present invention for switching the rotational state of the rotating body will be described based on the drawings. First, an embodiment of the stopper capable of switching the rotation of the rotating body between the two-way lock state and the two-way free state is shown in FIGS. 1 and 2 as a whole view thereof, and in FIG. Is shown by a perspective view, and in FIG. 4 to FIG. 7 the main components are shown separately.

  As shown in FIG. 1 to FIG. 3, the stopper of the present embodiment is provided with the fixing member 2, and in the fixing member 2, it is possible to prevent bidirectional rotation (bidirectional lock) and allow bidirectional rotation. The rotary body 4 which is an object to be switched to the two-way (bidirectional free) state, a cylindrical rolling element 6 for switching the operating state of the rotary body 4, a spring 7 for pressing the rolling element 6, and pressing of the spring 7 A cam body 9 provided with a cam 8 for operating the rolling element 6 and an operation means 10 for operating the attitude of the cam body 9 are disposed.

  The fixing member 2 includes a housing 12 and a fixing ring 14 and a fixing disc 16 fixed to the inside of the housing 12.

  Referring mainly to FIG. 4, the housing 12 includes a substantially annular plate-shaped substrate 18 and a cylindrical outer wall 20 axially extending in the axial direction on one side surface of the substrate 18 concentrically therewith. Have. On the radially inner side of the outer wall 20 of the substrate 18, a recessed area 22 is formed, the outer edges of which generally connect nine semicircles at equal angular intervals (see FIG. 3). An annular ridge 24 having a rectangular cross-section and slightly projecting in the axial direction is formed on the inner peripheral edge of the recessed area 22. In the recessed area 22, a first support piece 26, a second support piece 28 and a third support piece 30 are further formed. Four first support pieces 26 are provided at equal angular intervals in the circumferential direction at a position slightly outside the annular ridge 24. The second support pieces 28 and the third support pieces 30 are alternately provided four at equal angular intervals in the circumferential direction at the outer edge of the recessed area 22. The circumferential angular positions of each of the first support pieces 26 and each of the second support pieces 28 are aligned. Each support piece is also in the shape of a circular arc, and the cross section is an axially standing rectangular. The first support piece 26 and the second support piece 28 have a smaller radial thickness than the third support piece 30. Further, in the recessed area 22, four support holes 32 having a circular cross section for rotatably supporting the cam 10 are formed at equal angular intervals in the circumferential direction. Each of the support holes 32 is aligned with the circumferential angular position of each of the third support pieces 30. Three auxiliary holes 34 having a substantially rectangular shape are provided at an angle interval of 90 degrees on the outer side of the recessed area 22 and on the inner side in the radial direction than the outer wall 20 of the substrate 18. The auxiliary holes 34 are used when removing the fixing ring 14 combined with the housing 12 from the housing 12 as described later. Three mounting holes 36 a and three mounting notches 36 b, which are used to mount the stopper of the present embodiment to an external device, are formed on the outer peripheral edge outside the outer side wall 20 of the substrate 18.

  Three axially extending rectangular grooves 38 are formed on the inner peripheral surface of the outer wall 20 at angular intervals of 90 degrees in the circumferential direction (respectively indicated by numerals 38a to c). An engagement piece 40 is provided at each upper end of the 38. In the illustrated embodiment, the positions of the grooves 38 and the auxiliary holes 34 are aligned when viewed in the circumferential direction. The upper end of the outer wall 20 on the diametrically opposite side of the circumferential angular position where the groove 38b is formed when viewed in the circumferential direction is a cut of a rectangular cross section extending over an angular range of approximately 90 degrees in the circumferential direction The notch 42 is formed. A shoulder surface 44 is formed at the upper end portion of the inner peripheral surface of the outer wall 20 by slightly enlarging the inner diameter except for the portion where the groove 38 and the notch 42 are formed.

  Four arc-shaped notches 46 are formed on the inner peripheral surface of the fixing ring 14 at equal angular intervals in the circumferential direction. Cam surfaces 48a and 48b are formed between circumferentially adjacent notches 46 on the inner peripheral surface of the fixing ring 14. When the cam surfaces 48a and 48b are combined with the rotating body 6 in the housing 12 as described later, the distance D between the cam surfaces 48a and 48b and the outer peripheral surface of the rotating body 6 changes in the circumferential direction and the distance D increases. The directions are set to be opposite to each other (see also the enlarged view of a portion C in FIGS. 1 and 2). That is, the cam surface 48a is gradually radially inward in the circumferential direction from the central position 48c of the two notches 46 adjacent to each other when viewed in the circumferential direction in the imaginary circle 48 indicated by the two-dot chain line in FIG. It is connected to a notch 46 which extends in an arc shape while being inclined and is located on one circumferential side of the central position 48c. On the other hand, the cam surface 48b extends in an arc while gradually inclining radially inward from the central position 48c toward the other side in the circumferential direction, and is connected to the notch 46 located on the other side in the circumferential direction of the central position 48c.

  A circular central hole 50 is formed in the fixed disc 16. An annular recessed area 52 is formed around the central hole 50, and an annular ridge 54 having a rectangular cross-section and slightly projecting in the axial direction is formed on the inner peripheral edge of the recessed area 52. Four circular support holes 56 are formed at equal angular intervals in the circumferential direction on the radially outward side of the annular ridge 54 and radially outward. Four arc-shaped operating grooves 58 extending in the circumferential direction are formed at equal angular intervals in the circumferential direction on the outer peripheral edge portion of the fixed disk 16 radially outward of the support holes 56 It is done. Each operation groove 58 is provided between the centers of two adjacent support holes 56 in the circumferential direction. An arc-shaped notch 60 extending in the circumferential direction is formed on the radially outward surface at the circumferential center of the operation groove 58. An engaging portion is also formed in the movement groove 58. In the illustrated embodiment, the engagement portions are engagement protrusions 62a, 62b. The engaging protrusions 62a and 62b both have the same shape, and the cross section has a substantially arc shape. The engagement protrusions 62 a and 62 b are respectively provided on the radially inward surfaces of the operation groove 58. More specifically, the engaging protrusion 62a is located on one side in the circumferential direction of the operating groove 58 and the engaging protrusion 62b is located on the other side in the circumferential direction in the operating groove 58, and the engaging protrusion 62a and the engaging protrusion 62b are in the circumferential direction They are arranged alternately.

  As described mainly with reference to FIG. 5, the rotating body 4 includes a disc-shaped rotation main portion 64. A protrusion 66 having a disc shape and being concentric with the rotation main portion 64 but smaller in diameter than this is fixed to one side surface of the rotation main portion 64 in the axial direction. An axial hole 70 extending in the axial direction is formed at the center of the rotating body 4.

  Referring mainly to FIG. 6, the cam body 9 has a plate-like base 74 to which a passive gear 72, which is a part of an external gear, is fixed at a part of a disc. A cylindrical support stand 76 is fixed to the center of one side surface of the base 74. A solid rod-like cam shaft 78 extending in the axial direction is fixed to the center of the support base 76, and two cams 8 are arranged on the outer peripheral surface of the cam shaft 78 at an angular interval of 180 degrees. The cam 8 extends in the axial direction from the proximal end to the distal end of the cam shaft 78. The cross section of the cam 8 has a shape obtained by removing a part of one side in the circumferential direction of the fan (if desired, the cross section of the cam 8 may be fan shaped), and radially outward from the outer peripheral surface of the cam shaft 78 Circumferentially extending side surface 8a extending linearly, circumferentially extending side surface 8b linearly extending radially outward from the outer peripheral surface of the cam shaft 78 toward the other circumferential direction, and rotation of the cam 8 And a circular arc surface 8c (outer peripheral surface) centered on the center. A single-sided annular ridge 80 having a rectangular cross section is formed on the outside of the support base 76 on one side of the base 74. On the other side of the base 74, the other side annular ridge 82 having a rectangular cross section is also formed. The inner diameter and the outer diameter of the one side annular ridge 80 and the other side annular ridge 82 and the axial projection length are equal, and the centers thereof are both coaxial with the rotation center of the cam 8.

  Referring to FIG. 7 in conjunction with FIGS. 1 to 3, the operating means 10 comprises a disc-like base 84 and a lever part 86 extending radially outward in a predetermined angular region of the base 84. . One side surface inside the outer peripheral edge portion 88 of the base portion 84 is concave, and a cylindrical wall 92 is provided at the center thereof. A drive gear 94 which is an external gear is formed on the outer peripheral surface of the cylindrical wall 92, and an annular ridge 96 having a rectangular cross section is formed on the inner peripheral edge of the end face of the cylindrical wall 92. An engagement portion is provided somewhat radially inward of the outer peripheral edge portion 88 on one side surface of the base portion 84. In the illustrated embodiment, the engagement portions are axially projecting engagement protrusions 98a, 98b. The engaging protrusions 98a and 98b have the same shape, and the cross-sectional shapes are respectively inclined radially inward toward the circumferential outer side from both circumferential ends of the arc-shaped outer central surface 100a and the outer central surface 100a. And a linearly extending outer inclined surface 100b. The engaging protrusions 98a and 98b are provided two by two at intervals in the circumferential direction. Three notches 102 are formed in the upper end portion of the outer peripheral edge portion 88 at angular intervals of 90 degrees in the circumferential direction. A shoulder surface 104 is formed at an arc-shaped portion of the outer peripheral edge portion 88 on the other side of the base portion 84 except for the angular region where the lever portion 86 is provided, by slightly reducing the outer diameter of this portion.

Continuing with reference to FIGS. 4 through 7 in conjunction with FIGS. 1 through 3, the components as described above are combined as follows.
First, the rotating body 6 and the fixing ring 14 are disposed in the housing 12. The rotary body 6 is rotatably supported by the main rotation portion 64 facing the inner peripheral surface of the first support piece 26. The fixing ring 14 is not rotatable relative to the housing 12 because the notch 46 engages with the third support piece 30. Then, the rolling element 6 is disposed between the cam surfaces 48 a and 48 b of the fixed ring 14 and the outer peripheral surface of the rotation main portion 64 of the rotating body 4, and the spring 7 is mounted on the first support piece 26 of the housing 12 and the second And the support piece 28 of the In this state, all the rolling elements 6 are pushed by the spring 7 in the direction in which the distance D with the outer peripheral surface of the rotating body 4 decreases, and the cam surfaces 48a and 48b and the outer peripheral surface of the main rotating portion 64 Bite in between. The stationary disc 16 is then placed in the housing 12. The fixed disk 16 can not rotate with respect to the housing 12 because the notch 60 formed in the operation groove 58 engages with the second support piece 28. At this time, the annular ridge 54 abuts on the side surface of the rotation main portion 64 of the rotating body 6. Then, the cam shaft 78 of the cam body 9, the cam 8, and the support base 76 are inserted into the support holes 56 of the fixed disc 16, and the cam body 9 is combined with the fixed disc 16. At this time, the one-side annular ridge 80 abuts on the stationary disc 16. Thereafter, the operating means 10 are arranged on the housing 12 to seal the inside of the outer wall 20. The operation means 10 is combined with the housing 12 with the drive gear 94 meshing with the passive gear 72 of the cam body 9 and the lever portion 86 aligned with the notch 42 of the housing 12 in the circumferential direction, and the operation means 10 has a plurality of positions It is possible to move between In the illustrated embodiment, the operating means 10 is pivotable in the circumferential direction within the formed angle range of the notch 42, and the operating means 10 operates the lever 86 to rotate the lever 86 as shown in FIG. And can be moved between the other side operating positions shown in FIG. When the operation means 10 is combined with the housing 12, the engagement piece 40 of the housing 12 engages with the shoulder surface 104 of the operation means 10 to prevent the operation means 10 from coming off the housing 12. The base 84 axially supports the members in the housing 12. As a result, the outer peripheral edge portion 88 faces or abuts against the shoulder surface 44 of the housing 12, the annular ridge 96 abuts on the side surface of the rotation main portion 64 of the rotating body 6, and the other side annular ridge of the cam body 9 82 abuts the base 84. Furthermore, in the state where the operating means 10 is combined with the housing 12, the engaging projections 98 a, 98 b are located in the operating groove 58 of the fixed disc 16.

  The rotation control device in the present invention combined as described above is formed on the fixing ring 14 as understood by referring to the sectional views B-B and C enlarged views of FIGS. 1 and 2. A plurality of spaces 106 are provided between the cam surfaces 48a and 48b and the outer peripheral surface of the rotor 6, and each of the spaces 106 is a rolling element pressed by the spring 7 in the direction in which the distance D decreases. 6 is installed. The increasing directions of the distance D between the cam surfaces 48a and 48b in the adjacent space portion 106 and the outer peripheral surface of the rotary body 6 are opposite to each other, and the adjacent space portions 106 form a pair of combined space portions 108. A plurality of combined space portions 108 are arranged at equal intervals on the outer periphery of the rotating body 4, and a cam 8 is disposed in the middle of each combined space portion 108, in the center in the illustrated embodiment.

Subsequently, the operation of the stopper in the present embodiment will be described with reference to FIGS. 1 and 2.
When the operation means 10 is in the one-side operation position shown in FIG. 1, the arc surface 8 c is separated from the rolling element 6 as shown in the sectional view B-B and the C section enlarged view of FIG. 1. Thereby, all the rolling elements 6 are pushed by the spring 7 in the direction in which the distance D between the rolling elements 6 and the outer peripheral surface of the rotating body 6 decreases, and the cam surfaces 48a and 48b and the outer peripheral surface of the rotating main portion 64 of the rotating body 4 And rotation of the rotary body 4 is blocked in both directions (bidirectional lock).

  On the other hand, when the lever unit 86 of the operation means 10 is operated to move the operation means 10 in the circumferential direction from the one-side operation position shown in FIG. 1 to the other side operation position shown in FIG. The gear 94 is rotated clockwise in the figure, and the cam 8 integral with the passive gear 72 meshing with it rotates counterclockwise (compare FIGS. 1 and 2). Thereby, as shown in the enlarged view of the C portion in FIG. 2, the arc surface 8c of the two cams 8 disposed on the outer peripheral surface of the cam shaft 78, more specifically, the other circumferential end thereof (that is, the other side 8a in the circumferential direction) In the direction in which the distance D is increased against the spring force of the spring 7 by contacting the circumferential end on the side on which the is formed) with each of the rolling elements 6 positioned on both sides in the circumferential direction of the cam shaft 78 At the same time, the rotation of the rotating body 4 is made bi-directionally rotatable (bidirectional free) by releasing the biting of the rolling element 6. At this time, in the rotation control device of the present invention, since the cross section of the cam 8 has a shape in which a part on one side in the circumferential direction of the fan spreading outward in the radial direction is removed, The cam 8 abuts on the rolling element 6 only by moving (in other words, operating), and the biting of the rolling element 6 can be released. That is, since the cross-sectional shape of the cam 8 is as described above, the amount of operation of the operation means 10 can be reduced. From this, when the operation means 10 is operated by a motor, it becomes possible to reduce the power consumption of this motor. Furthermore, in the illustrated embodiment, the outer peripheral surface of the cam 8 in contact with the rolling element 6 is formed to be a circular arc surface 8c centered on the rotation center of the cam 8, so external force such as vibration Even if the contact point of the cam 8 in contact with the rolling element 6 fluctuates to some extent, no rotational moment acts on the cam 8 since the normal at the contact point always passes through the rotation center. Therefore, the posture of the cam 8 can be stably held.

  In the present embodiment, engaging projections 62a, 62b, 98a, 98b are provided on the operating means 10 and the fixing member 2, respectively, and the engaging projections 98a, 98b provided on the operating means 10 are the fixing member 2. The position of the operation means 10 is held by resiliently engaging and engaging with the engagement protrusions 62a and 62b provided on the rear side. That is, when the operation means 10 is in the one-side operation position shown in FIG. 1, the engagement projection 98a of the operation means 10 is one circumferential end of the operation groove 58 of the fixed disk 16 and the inner peripheral surface thereof Is positioned on the outer side in the circumferential direction than the engagement protrusion 62a formed on the front side, and the operation protrusion 10a is held at the one-side operation position by the engagement protrusion 98a of the operation means 10 engaging with the engagement protrusion 62a of the fixed disc 16 Be done. When the operation means 10 is operated from the one-side operation position shown in FIG. 1 to the other-side operation position shown in FIG. 2, the engagement projection 98a of the operation means 10 elastically rides over the engagement projection 62a of the fixed disc 16 The movement groove 58 is moved to the other side in the circumferential direction. At this time, as shown in FIG. 2, the engagement protrusion 98 b of the operation means 10 resiliently rides over the engagement protrusion 62 b of the fixed disk 16 and is the other end of the operation groove 58 in the circumferential direction And the engaging projection 98b of the operating means 10 is engaged with the engaging projection 62b of the fixed disc 16 so that the operating means 10 can be operated. Is held at the other side operation position. Therefore, in the rotation control device of the present embodiment, there is no possibility that the position of the operation means is changed by various external forces such as vibration, and the rotation state of the rotating body 6 can be stably maintained. Become. Also, when the engagement projection 98b of the operation means 10 elastically rides over the engagement projection 62b of the fixed disk 16, so-called "moderate feeling" is produced by the reaction force, and the operator changes the position of the operation means 10 Can be recognized with certainty.

In the illustrated embodiment, the engaging portions provided on the operating means 10 and the fixed disk 16 are both engaging projections, but instead, one is an engaging convex and the other is engaging It may be a recess. Further, the operating means and the fixed disc may be engaged with each other using an appropriate elastic member. This will be described with reference to FIGS. 8 and 9. FIGS. 8 and 9 are views each showing a modification of the state in which the operating means and the fixed disc are combined via an elastic member.
In the modified example shown in FIG. 8, two arc-shaped engaging recesses 62a are formed at predetermined angular intervals on the outer periphery of the fixed disk 16a (with a thin black mark for easy understanding). ing. On the other hand, a space extending linearly in the radial direction is formed inside the lever portion 86a of the operation means 10a, and the ball 110a biased radially inward by the coil spring 108a is partially accommodated in the space It is done. In the modification shown in FIG. 9, the operating means 10a is held at the one-side operation position or the other-side operation position by the ball 110a being elastically fitted into the engagement recess 62a of the fixed disk 16a by the coil spring 108a.
In the modification shown in FIG. 9, two arc-shaped engaging recesses 62b are formed at predetermined angular intervals on the outer periphery of the fixed disk 16b (with a thin black mark for easy understanding). ing. Further, two notches 112b linearly extending in the radial direction are formed on the outer periphery of the fixed disc 16b at intervals in the circumferential direction. And between the outer periphery of the fixed disc 16b and the outer peripheral edge portion 88b of the operation means 10b, a plate spring 108b (hatched for easy understanding) which is generally arc-shaped is disposed There is. The plate spring 108b is combined with the fixed disc 16b in a non-rotatable state by being inserted into the notches 112b at both ends, and portions other than the both ends are radially outward from the outer periphery of the fixed disc 16b. It is located at a distance from each other. A recess 114b corresponding to the notch 112b is formed at a position corresponding to the engagement recess 62b of the fixed disk 16b as viewed in the circumferential direction of the plate spring 108b. The inner peripheral surface of the outer peripheral edge portion 88b of the operation means 10b is spaced radially outward from the plate spring 108b except for the projecting portion 116b formed here. The cross-sectional shape of the protrusion 116 b corresponds to the engagement recess 62 b and the recess 114 b. In the modification shown in FIG. 10, the operating portion 10b is held at the one-side operation position or the other-side operation position by the projection 116b being elastically fitted in the recess 114b of the plate spring 108b.

  Although the embodiment in which the rotation control device of the present invention is configured as a stopper that can switch the rotation of the rotating body between the two-way lock state and the two-way free state has been described with reference to FIGS. The rotation control device according to the invention is not limited to the stopper as described above, and a device capable of switching the rotation of the rotating body between the two-way lock state and the one-way free state, or any of the forward and reverse directions in which the rotation of the rotating body is permitted. The present invention can also be applied to a device capable of reversing its direction or a device in which the rotation of the rotating body can be switched between the bidirectional free state and the unidirectional lock state. That is, in the stopper described above, two cams are arranged at angular intervals of 180 degrees in the circumferential direction, but instead, if only one cam 8 'is arranged as shown in FIG. The rotation of the rotating body can be switched between the bidirectional lock state and the one-way free state. Further, as shown in FIG. 10 (b), by arranging two cams 8 'at an angular interval of 90 degrees, it is possible to reverse either forward or reverse direction in which rotation of the rotating body is permitted. It becomes an apparatus. Furthermore, as shown in FIG. 10C, if three cams 8 '' 'are arranged at an angular interval of 90 degrees, the rotation of the rotating body is between the bidirectional free state and the unidirectional lock state. It becomes a switchable device. For the details of changing the operation mode of the rotation control device by such a cam arrangement, refer to Patent Document 2 mentioned above.

  As described above in detail, the rotation control device of the present invention is configured such that the section of the cam has a shape in which a fan or a part of one side in the circumferential direction of the fan spreading outward in the radial direction is removed. It is intended to reduce it. The present invention is not limited to the above-described embodiment, and various modifications and alterations are possible without departing from the scope of the present invention. For example, in the above embodiment, the engagement protrusions provided on the fixing member are disposed one by one in the operation groove formed on the fixed disk, but instead, two each are provided in the operation groove It may be arranged. That is, in the above embodiment, each of the engagement protrusions of the fixing member is engaged with the engagement protrusion of the operation means only at one of the one-side operation position and the other-side operation position. Two engaging protrusions provided on the fixing member are provided in the operation groove, and one side of the two engaging protrusions provided on the fixing member when the operating means is in the one-side operation position is the operating means When in the other side operation position, the other of the two engagement projections provided on the fixing member may be engaged with the engagement projections of the operation means. In this way, the position of the operation means can be held more reliably. Further, in the above embodiment, the rolling element 6 has a cylindrical shape, but it may have a spherical shape instead. Furthermore, in the above embodiments, the operating means was movable between two positions, but the operating means may be movable between three or more positions. For example, when the cam is installed as shown in FIG. 10 (c), the operating means can be moved between three positions so that the cam body can be rotated twice by 90 degrees. The device is capable of switching between the one-way free state, the two-way free state, and the other-direction free state.

2: fixed member 4: rotating body 6: rolling element 7: spring 8: cam 8c: arc surface 9: cam body 10: operating means 12: housing 14: fixed ring 16: fixed disc 72: passive gear 94: drive gear 106: Space 108: Combined space

Claims (4)

A rotation control device capable of switching the rotation state of a rotating body by the operation of an operation means, comprising:
A fixing member provided around the outer periphery of the rotating body,
The fixed member is provided with a plurality of spaces formed with a cam surface whose distance from the outer periphery of the rotating body changes in the circumferential direction, and the plurality of spaces increase the distance in adjacent spaces. And the adjacent spaces form a pair of combined space parts, and a plurality of the combined space parts are arranged on the outer periphery of the rotating body,
A rolling element pressed by a spring in the direction in which the distance decreases is installed in each of the space sections, and the rolling element is moved in the direction in which the distance increases in the middle of the combined space section. The cam is installed,
A passive gear is fixed to each of the cams, and the operation means is provided with a drive gear that meshes with the passive gear and changes the attitude of the cam.
The cross section of the cam has a shape in which a part of a fan or a circumferential one side of the fan which spreads radially outward is removed,
The operation means is circumferentially movable between a plurality of positions, and when the operation means is at any of the plurality of positions, the rolling element is engaged between the cam surface and the rotating body. When the operation means is in any other position of the plurality of positions, the cam abuts on the rolling element to release the biting of the rolling element. The rotation control device is characterized in that the rotating body is in a rotatable state.   The rotation control device according to claim 1, wherein the plurality of combined space portions are arranged at equal intervals on an outer periphery of the rotating body.   The rotation control device according to claim 1 or 2, wherein the operation means and the fixing member are provided with an engagement portion which holds the position of the operation means by elastically getting over and engaging.   The rotation control device according to any one of claims 1 to 3, wherein an arc surface centering on a rotation center is formed on an outer peripheral surface of the cam.