SCISSORS GEAR DEVICE

PROBLEM TO BE SOLVED: To provide a scissors gear device, which can be reduced in size as the whole device by simplifying its configuration to increase a use application range and can simplify an assembling process.SOLUTION: A scissors gear device 100 includes a main gear 101 and a sub-gear 104. The main gear 101 includes three curved-surface protrusions 102 that protrude in an arc along a circumferential direction at the periphery edge on one side face of the main gear. The sub-gear 104 includes three slanted surfaces 105 arranged along the circumferential direction at the periphery edge on the side face opposing to the main gear 101. Each slanted surface 105 is formed inclined in a planar shape toward the interior of the sub-gear 104, at a prescribed angle along the circumferential direction and at a position corresponding to the curved-surface protrusions 102 formed on the side face of the main gear 101. The sub-gear 104 is pressed against the main gear 101 by a spring 107. Thus, the sub-gear 104 rotates and is displaced in the circumferential direction with respect to the main gear 101, producing a phase difference.