Patent ID: 7334979

Claim:
A substrate transfer apparatus comprising: a first cassette for containing substrates therein; a second cassette for containing substrates therein; a adjustable cassette between the first and second cassettes, the adjustable cassette having a pair of side walls, a top wall, and a height-adjusting mechanism, a post and a adjustable beam movably connected to the post, a portion of the adjustable beam being fixed on the top wall of the adjustable cassette; a base supporting the first and second cassettes and the adjustable cassette thereon, and defining a slide groove therein, the post being fixed on the base; and a push unit comprising a slide portion, and an urging portion connected to the slide portion; wherein the slide portion can slide in the slide groove, the height-adjusting mechanism can adjust a height of the adjustable cassette according to the height of the first cassette and the height of the second cassette, and the urging portion can push substrates in the first cassette into the adjustable cassette and further into the second cassette, each of the side walls of the adjustable cassette comprises a plurality of side plates and concertina rods, the side plates each have a supporting member extending inwardly therefrom and two sliding slots defined therein, each concertina rod comprises two rods pivotally connected together, and the concertina rods are movably connected to the side plates at the sliding slots.