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 comprising:
- 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 each of the first swing portion and the second swing portion includes:
- an arm portion extending in a 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 and is fixed to the arm portion, the first track member having an outer peripheral surface including a first raceway surface having a circular annular shape and a second raceway surface having a circular annular shape arranged away from the first raceway surface in the height direction of the rail so that the arm portion is located between the first raceway surface and the second raceway surface;
- a second track member having a circular annular shape, which has an inner peripheral surface including a third raceway surface having a circular annular shape being opposed to the first raceway surface and is connected to the frame;
- a third track member, which has an inner peripheral surface including a fourth raceway surface having a circular annular shape being opposed to the second raceway surface and has an outer peripheral surface including a first rail groove having a circular annular shape being in contact with the rail;
- 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 third raceway surface;
- and
- a plurality of second rolling elements arranged in a second rolling passage having a circular annular shape defined by the second raceway surface and the fourth raceway surface,
- wherein the second bearing portion includes:
- a fourth track member, which has an outer peripheral surface including a fifth raceway surface having a circular annular shape and is fixed to the arm portion;
- a fifth track member, which has an inner peripheral surface including a sixth raceway surface being opposed to the fifth 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
- third rolling elements arranged in a third rolling passage having a circular annular shape defined by the fifth raceway surface and the sixth raceway surface, and
- wherein the second track member of each of the first swing portion and the second swing portion is connected to the frame, and the second bearing portion of each of the first swing portion and the second swing portion is separate from the frame.