CPC G01R 31/2867 (2013.01) [B66B 9/00 (2013.01); G01R 31/2862 (2013.01); H01L 21/677 (2013.01)] | 20 Claims |
1. An elevator unit for transferring a tray, the elevator unit comprising:
a tray guide block on which a tray is seated;
a wrapping connector driving member configured to elevate and lower the tray guide block;
a fixed fastener connected to the tray guide block; and
a corrective fastener connected to the wrapping connector driving member and configured to rotatably coupled to the fixed fastener.
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