Pallet conveying apparatus and pallet conveying method

1. A pallet conveying apparatus, comprising:

a pair of straight rails provided parallel to each other at a predetermined distance from each other in a horizontal direction, the pair of straight rails being configured such that a pallet is movably mounted thereon;

a pallet linear feeding unit configured to convey the pallet mounted on the straight rails along the straight rails;

a pair of curved rails provided in a curved manner to couple both end parts of the pair of straight rails, the pair of curved rails being configured such that the pallet is movably mounted thereon; and

a pallet curved feeding unit configured to convey the pallet mounted on the curved rails along the curved rails,

wherein the pallet curved feeding unit includes:

an arm having a locking member on a tip, the locking member being configured to lock to the pallet; and

an actuator configured to rotate the arm with a base end of the arm serving as a center of rotation, and

the locking member is configured to be moved in a longitudinal direction of the arm according to the rotation of the arm.

2. The pallet conveying apparatus according to claim 1 , wherein the locking member is configured to be moved in the longitudinal direction of the arm to be moved along the end parts of the straight rails according to the rotation of the arm.

3. The pallet conveying apparatus according to claim 1 , wherein a plurality of the arms are radially arranged.

4. The pallet conveying apparatus according to claim 1 , further comprising a receiving member projectably and retractably provided on the pallet, the receiving member being configured to lock to the locking member.

5. The pallet conveying apparatus according to claim 1 , further comprising a receiving member projectably and retractably provided on the pallet, the receiving member being configured to lock to the locking member.

6. A pallet conveying method for guiding a pallet, which is moved on either one of two straight rails parallel to each other at a predetermined distance from each other, from an end part of the one of the pair of straight rails to an end part of other of the pair of straight rails, comprising:

coupling both end parts of the pair of straight rails by a pair of curved rails; and

conveying the pallet, which is moved from the one of the pair of straight rails to the curved rails, to the end part of the other of the pair of straight rails along the curved rails,

wherein, in conveying the pallet along the curved rails, a locking member is locked to the pallet and an arm is rotated with a base end of the arm serving as a center of rotation, the arm having the locking member on a tip,

the locking member is moved in a longitudinal direction of the arm according to the rotation of the arm.

7. The pallet conveying method according to claim 6 , wherein the locking member is moved in the longitudinal direction of the arm to be moved along the end parts of the straight rails according to the rotation of the arm.