Pallet conveying apparatus

A pallet conveying apparatus, comprising:

• a first and a second guide rails separated in a vertical direction, the first and second guide rails being configured such that a pallet is movably mountable thereon;
• an endless first circulation belt provided along the first and second guide rails, recesses and projections engageable with the pallet being formed on one principal surface of the first circulation belt;
• a first pallet feeding part configured to convey the pallet by rotating the first circulation belt engaged with the pallet;
• a first pallet moving part provided at one end sides of the first and second guide rails, the first pallet moving part moving the pallet from one of the first and second guide rails to the other;
• a third and a fourth guide rail separated in the vertical direction to be respectively on the same planes as the first and second guide rails, the third and fourth guide rails being configured such that the pallet is movably mountable thereon;
• an endless second circulation belt provided along the third and fourth guide rails, recesses and projections engageable with the pallet being formed on one principal surface of the second circulation belt;
• a second pallet feeding part configured to convey the pallet by rotating the second circulation belt engaged with the pallet;
• and
• a second pallet moving part provided at one end sides of the third and fourth guide rails, the second pallet moving part moving the pallet from one guide rail to the other;
• and
• a fifth pallet moving part configured to horizontally move the pallet between the first or second guide rail and the third or fourth guide rail, wherein:
• the pallet is engaged with an upper side of the first circulation belt when moving along the first guide rail provided on a vertically upper side while being engaged with a lower side of the first circulation belt when moving along the second guide rail provided on a vertical lower side;
• and
• the pallet is engaged with an upper side of the second circulation belt when moving along the third guide rail provided on the vertically upper side while being engaged with a lower side of the second circulation belt when moving along the fourth guide rail provided on the vertical lower side.