A rotation mechanism includes a first rotary member defining an axis, a second rotary member, a track disc, a first rod and a second rod. The first rotary member, the second rotary member and the track disc are assembled coaxially, and the first rotary member and the second rotary member rotate rela
A rotation mechanism includes a first rotary member defining an axis, a second rotary member, a track disc, a first rod and a second rod. The first rotary member, the second rotary member and the track disc are assembled coaxially, and the first rotary member and the second rotary member rotate relative to the track disc. The track disc has a first groove, a second groove, a third groove and a center passed by the axis. The first and the second grooves are sited at the same circumference, and an extension direction of the third groove passes through the center. The first rod has a first end slidably disposed in the first groove, and a second end. The second rod has a third end pivoted to the second end and slidably disposed in the third groove, and a fourth end slidably disposed in the second groove.
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1. A rotation mechanism, comprising: a first rotary member, defining an axis;a second rotary member, assembled to the first rotary member coaxially and rotatable relative to the first rotary member;a track disc, assembled coaxially with the first rotary member and the second rotary member and locate
1. A rotation mechanism, comprising: a first rotary member, defining an axis;a second rotary member, assembled to the first rotary member coaxially and rotatable relative to the first rotary member;a track disc, assembled coaxially with the first rotary member and the second rotary member and located between the first rotary member and the second rotary member, such that the first rotary member and the second rotary member are rotatable relative to the track disc, wherein the track disc has a first groove, a second groove and a third groove and a center passed by the axis, the first and the second grooves are sited at the same circumference, and an extension direction of the third groove passes through the center;a first rod, having a first end and a second end which are opposite to each other, wherein the first end is slidably disposed in the first groove; anda second rod, having a third end and a fourth end which are opposite to each other, wherein the fourth end is slidably disposed in the second groove, and the third end is pivoted to the second end of the first rod and slidably disposed in the third groove, when one of the first rotary member and the second rotary member rotates, the other one of the first rotary member and the second rotary member is driven by the linkage of the first rod and the second rod to rotate synchronously and reversely. 2. The rotation mechanism according to claim 1, wherein the first rod and the second rod are held and freely movable between the first rotary member and the track disc. 3. The rotation mechanism according to claim 1, wherein the first end of the first rod has a first guide rod, the first rotary member has a first fixing portion, one end of the first guide rod is pivoted to the first fixing portion while the other end of the first guide rod is slidably disposed in the first groove, the fourth end of the second rod has a second guide rod, the second rotary member has a second fixing portion, and one end of the second guide rod is pivoted to the second fixing portion while the other end of the second guide rod is slidably disposed in the second groove. 4. The rotation mechanism according to claim 3, wherein the first rotary member further comprises a fourth groove, the second end of the first rod and the third end of the second rod are connected with a common guide rod together, one end of the common guide rod is slidably disposed in the third groove, and the other end of the common guide rod is slidably disposed in the fourth groove. 5. The rotation mechanism according to claim 1, wherein the first rotary member has a first axle hole, the second rotary member has a second axle hole, the track disc has a central axle hole, and the first axle hole, the second axle hole and the central axle hole are coaxial to the axis. 6. The rotation mechanism according to claim 5, wherein one side of the central axle hole of the track disc which faces the first rotary member has a first ring flange for being pivotally assembled to the first axle hole, and the other side of the central axle hole of the track disc which faces the second rotary member has a second ring flange for being pivotally assembled to the second axle hole. 7. The rotation mechanism according to claim 6, further comprising a fixing axle bolt for penetrating through the first axle hole and the central axle hole. 8. The rotation mechanism according to claim 1, wherein the first rod and the second rod respectively present in a L shape to avoid the axis. 9. The rotation mechanism according to claim 1, wherein the first rod and the second rod respectively present in a straight bar shape or an arc shape. 10. The rotation mechanism according to claim 1, wherein both the first and the second grooves present in an arc shape, and a central angle formed by two ends of each of the first and the second grooves and the center ranges from 40 to 45 degrees. 11. An electronic device, comprising: a body;a rotation mechanism according to claim 1, wherein the track disc is fixed to the body;a first stand, fixed to the first rotary member; anda second stand, fixed to the second rotary member, wherein when the first stand rotates relative to the body, the second stand is driven by the linkage of the rotation mechanism to rotate relative to the first stand synchronously and reversely. 12. The electronic device according to claim 11, wherein the first stand and the second stand rotate on the same rotation plane. 13. The electronic device according to claim 12, wherein the first stand and the second stand form a line shape when being closed relative to the body and form an X shape when being opened relative to the body.
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