A straight-curved guide device, comprising:
- a rail including a straight part and a curved part;
- and
- a movable element being movable on the rail, the movable element including:
- a frame;
- a first swing portion, which is connected to the frame and is in contact with the rail;
- and
- a second swing portion, which is connected to the frame in such a manner as to be spaced apart from the first swing portion in a longitudinal direction of the rail, and is in contact with the rail,
- wherein the first swing portion and the second portion are configured to be pivotable about connecting portions to the frame in a plane including the longitudinal direction of the rail and a width direction of the rail,
- wherein each of the first swing portion and the second swing portion includes:
- an arm portion extending in the width direction of the rail;
- a first bearing portion arranged on one side of the arm portion when viewed from a center of the arm portion in a longitudinal direction of the arm portion;
- and
- a second bearing portion arranged on another side of the arm portion when viewed from the center of the arm portion in the longitudinal direction of the arm portion,
- wherein the first bearing portion includes:
- a first track member, which passes through the arm portion in a height direction of the rail, has an outer peripheral surface including a first raceway surface having a circular annular shape, and is fixed to the arm portion;
- a second track member, which has an inner peripheral surface including a second raceway surface having a circular annular shape being opposed to the first raceway surface, and has an outer peripheral surface including a first rail groove having a circular annular shape being in contact with the rail;
- and
- a plurality of first rolling elements arranged in a first rolling passage having a circular annular shape defined by the first raceway surface and the second raceway surface,
- wherein the second bearing portion includes:
- a third track member, which passes through the arm portion in the height direction of the rail, has an outer peripheral surface including a third raceway surface having a circular annular shape, and is fixed to the arm portion;
- a fourth track member, which has an inner peripheral surface including a fourth raceway surface having a circular annular shape being opposed to the third raceway surface, and has an outer peripheral surface including a second rail groove having a circular annular shape being in contact with the rail;
- and
- a plurality of second rolling elements arranged in a second rolling passage having a circular annular shape defined by the third raceway surface and the fourth raceway surface, and
- wherein the straight-curved guide device further comprises an elastic member, which is arranged across a space between the arm portion of the first swing portion and the arm portion of the second swing portion and is in a compressed state in which the elastic member is compressed in the longitudinal direction of the rail or in a stretched state in which the elastic member is stretched in the longitudinal direction of the rail.