Abstract: There is disclosed a gear module comprising an output gear pivotally fitted to a base, a transmission gear rotated by a driving force from a driving motor to transmit the driving force to the output gear, a power actuating lever having a base end pivotally fitted to the base to be rotated around the base end; an actuated lever having a top end pivotally fitted to the transmission lever and a base end pivotally fitted to the base; and a connection bar connecting the top end of the power actuating lever and the top end of the actuated lever, the connection bar allowing the actuated lever to rotate in accordance with a rotation of the power actuating lever and allowing the transmission gear and the output gear to be engaged with each other, wherein the link axises of the power actuating lever and the connection bar form approximately a straight line when the transmission lever is engaged with the output gear.

Abstract: It is an object of the invention to provide an inexpensive and high-quality fluid bearing which improves the workability in assembly or coupling of a shaft and a rotator. In order to achieve this object, a fluid bearing according to the invention includes a rotating shaft, a bearing member for rotatably supporting the rotating shaft, and first and second fluid film formation mechanisms arranged at positions near a central portion of the rotating shaft along its longitudinal direction. The first fluid film formation mechanism forms a fluid film between the rotating shaft and the bearing member while the rotating shaft rotates in a first direction. The second fluid film formation mechanism forms a fluid film between the rotating shaft and the bearing member while the rotating shaft rotates in a second direction opposite to the first direction.

Abstract: A dynamic pressure-type fluid bearing usable in a polygon mirror scanner for a laser beam printer includes a sleeve having an inner peripheral surface and a bottom face, and a journal having an outer peripheral surface cooperating with the inner peripheral surface of the sleeve across a predetermined clearance, and an end face cooperating with the bottom face of the sleeve. In an embodiment, the sleeve is rotatable relative to the journal and is held by a magnetic retaining force in such a manner that a predetermined gap is formed between the bottom face of the sleeve and the end face of the journal even when the bearing is at rest. The bottom face of the sleeve includes a porous body so that the gap between the bottom face and end is communicated with the outside of the bearing.