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1. An apparatus comprising a gripper for a container-transport system, said gripper comprising a first pair of arms, a controller, a spring, and first and second rollers, wherein said first pair of arms comprises a first arm that comprises a first face formed thereon and a second arm that comprises a second face formed thereon, wherein said controller is disposed between said first and second arms, wherein said controller pivots said first and second arms towards one another, wherein said spring pre-loads said first and second arms towards each other, wherein said first and second rollers are arranged at said controller and rotate about a central control-axis thereof, wherein, for pivoting said first arm, said controller guides movement of said first roller along said first face, wherein, for pivoting said second arm, said controller guides movement of said second roller along said second face, wherein said first and second faces are shaped such that, in response to movement of said first and second rollers, said first and second arms carry out an equiangular and symmetric pivoting between an opened and closed position of said gripper, wherein said first and second arms are gripper arms, wherein said first and second rollers are control rollers, wherein said controller is a rotatable control unit, wherein said first and second faces are inner control faces, and wherein movement along said first face is selected from said group consisting of sliding and rolling.
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