| 摘要 |
A device comprising a central portion (49, 85) and conveyor portions (45, 47, 71, 73) connected to the central portion (49, 85), each of said conveyor portions including a travelling path (51, 53, 75, 77) and plate driving means (65, 115). The travelling paths (51, 53, 75, 77) of at least two of the conveyor portions (45, 47, 71, 73) are located on different levels, and the central portion (49, 85) has lifting means (85) for moving a plate (55) located thereon up or down between the different levels of the travelling paths (51, 53, 75, 77) of the conveyor portions (45, 47, 71, 73). The plate has peripheral hooking means (125, 127, 129, 131) facing at least one of the conveyor portions (45, 47, 71, 73) and being engageable with or disengageable from corresponding hooking means (125, 127, 133) on the conveyor portion in question when the pallet is moved up or down by said lifting means.
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