Method and apparatus for checking guide-roll alignment in a continuous-casting machine

Claim 1

In an apparatus for checking alignment of guide rolls of a continuous casting machine with respect to one another and with respect to a mold thereabove, said apparatus comprising: a target adapted to be lowered through a mold into the roll pass; a vertical transit; a stand for positioning and centering said transit over the mold; a reeling mechanism adapted to be mounted on the mold; and a line suspending said target from said reeling mechanism for moving said target to various levels within the roll pass to be sighted on by said transit; the improvement in which said target includes: a pair of diagonally opposed angle irons having roll-contacting faces at right angles to one another; a diagonally extending support; means fixing said support with respect to one angle iron and permitting relative sliding movement between said support and the other angle iron; spring means urging said angle irons apart to expand said target; means for contracting said target against the action of said spring means; and a grid pattern on said support centered with respect to the roll pass when the target is expanded into contact with the rolls.