Overhead conveyance vehicle
An overhead transport vehicle includes a conveyor to travel along a track, a holder to hold an object to be conveyed, and a lifting driver to lift and lower the holder. The holder includes a base, a holder including a body and a pair of grippers connected to the body in an openable/closable manner, the holder being attached to the base so as to be movable along an opening/closing direction of the pair of grippers, and a first elastic member to restrict, between the base and the body, movement of the holder along the opening/closing direction.
1. An overhead transport vehicle comprising:
a conveyor to travel along a track;
a holder to hold an object to be conveyed; and
a lifting driver to lift and lower the holder; wherein
the holder includes:
a base;
a holding portion including a body and a pair of grippers connected to the body in an openable/closable manner, the holding portion attached to the base so as to be movable along an opening/closing direction of the pair of grippers; and
a pair of first elastic members to restrict, between the base and the body, movement of the holding portion along the opening/closing direction;
a movable plate is provided to the body so as to be located between the body and one of the pair of grippers;
a first stopper plate and a second stopper plate are provided to the base, the first stopper plate located closer to a first of the pair of grippers than the movable plate and facing the movable plate in the opening/closing direction, the second stopper plate located closer to a second of the pair of grippers than the movable plate and facing the movable plate in the opening/closing direction;
a first of the pair of first elastic members is between the movable plate and the first stopper plate; and
a second of the pair of first elastic members is between the movable plate and the second stopper plate.
2. The overhead transport vehicle according to claim 1 , wherein the holder further includes a linear-motion mechanism to guide the pair of grippers in an openable/closable manner and guide the holding portion in a movable manner.
3. The overhead transport vehicle according to claim 2 , wherein the opening/closing direction extends along a traveling direction of the conveyor.
4. The overhead transport vehicle according to claim 3 , wherein the holder further includes:
a connector connected to a lower end portion of a belt included in the lifting driver; and
a second elastic member between the base and a portion of the connector located below the base.
5. The overhead transport vehicle according to claim 2 , wherein the holder further includes:
a connector connected to a lower end portion of a belt included in the lifting driver; and
a second elastic member between the base and a portion of the connector located below the base.
6. The overhead transport vehicle according to claim 1 , wherein the opening/closing direction extends along a traveling direction of the conveyor.
7. The overhead transport vehicle according to claim 6 , wherein the holder further includes:
a connector connected to a lower end portion of a belt included in the lifting driver; and
a second elastic member between the base and a portion of the connector located below the base.
8. The overhead transport vehicle according to claim 1 , wherein the holder further includes:
a connector connected to a lower end portion of a belt included in the lifting driver; and
a second elastic member between the base and a portion of the connector located below the base.