ESA 60 (Amp 20 Only) |
Three laser light barriers scan the bars as they move through the induction heater and report the passage of hte bar-to-bar transition point. The distance between the light barriers serves as the 'yard-stick'.
Based on the light barrier pulses, the ESA computer calculates the cutoff length and remaining distance to be travelled by the bar ends.
At the right instant it opens the feed rolls to admit the new bar and then lets the bar ends drop by opening the cutoff holding finger at the shearing station. |
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ESA 600 |
With the ESA 600 version, the computer again receives reports from the three light barriers when the bar ends pass by.
But it tracks their further progress, stroke for stroke, with a measuring wheel pressed against the bar (see below); the roller's turns are communicated to the computer by a rotary transmitter on the wheel.
Thus all factors that could distrub the bar's movement are taken into account, e.g. momentary hang-up of the bar, bits of material sticking to the cutter blade or the bar stop, or hindering of the infeed stroke by a burr on the moving blade. |
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