Transporter

1 . A transporter for transferring a target object to and from a roller conveyor comprising a plurality of rollers and a support frame supporting the plurality of rollers, the transporter comprising:

a movable body;

a holder configured to hold the target object; and

a lifter configured to raise and lower the holder with the holder being suspended from the movable body, and

wherein:

the holder comprises a support configured to support the target object, a restrictor configured to restrict movement of the target object being held in a transport direction in which the roller conveyor transports the target object, and an open-close assembly configured to open and close the restrictor,

the lifter is configured to raise and lower the holder in a vertical direction to a first position at which the target object is loaded into and unloaded from the holder by the roller conveyor and to a second position at which the support supports or releases the target object, with the second position located above the first position,

the restrictor is configured to enter an open state in response to the holder at the first position and to enter a closed state in response to the holder at the second position, the restrictor in the open state having no overlap with a movement path of the target object transported by the roller conveyor when viewed in the transport direction, the restrictor in the closed state having an overlap with the movement path of the target object when viewed in the transport direction,

the open-close assembly comprises a movable member and a linkage, the movable member configured to switch between, in response to the holder being raised or lowered, a pressed state in which the movable member is pressed by the support frame and a released state in which the movable member is released from pressure from the support frame, the linkage linking the movable member and the restrictor to cause the restrictor to switch from the open state to the closed state in response to the movable member switching from the pressed state to the released state and to cause the restrictor to switch from the closed state to the open state in response to the movable member switching from the released state to the pressed state,

the support comprises an insert portion placeable, with the holder at the first position, below a transport surface of the roller conveyor through a roller clearance between a pair of rollers, among the plurality of rollers, adjacent to each other in the transport direction in the roller conveyor, and

the movable member is attached to the insert portion, with the movable member configured to be pressed upward by the support frame to enter the pressed state in response to the holder being lowered from the second position to the first position and configured to be released from pressure from the support frame to enter the released state in response to the holder being raised from the first position to the second position.

2 . The transporter according to claim 1 , wherein:

the insert portion is hollow, and

the linkage is at least partially disposed inside the insert portion.

3 . The transporter according to claim 1 , wherein:

the support has an upper portion disposed upward from the transport surface of the roller conveyor when the holder is at the first position, and

the restrictor is attached to the upper portion to be open and closed above the transport surface of the roller conveyor.

4 . The transporter according to claim 1 , wherein:

the movable member is supported in a manner movable relative to the insert portion in the vertical direction and at least partially protrudes downward from the insert portion, and the movable member is movable toward a surface of the support frame facing upward from above and is pressed against the support frame to enter the pressed state.