Samuel Strapping Systems P-625, Safety, Operation, Maintenance And Parts Manual, Page: 16 / 54

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PRINCIPAL OF OPERATION cont.
3. TENSION. When LS1 is closed, the
electromagnetic clutch energizes and the
camshaft rotates approximately 45 degrees.
This small amount of shaft rotation is
controlled by LS3, mounted at the right-hand
end of the camshaft. When LS3 closes it de-
energizes the electromagnetic clutch and the
end gripper will have been moved upward to
contain the upper strap beneath the anvil.
The tension lever pivots and closes the tension
rollers. The tension rollers close against the
strap, drawing it back through the head, thus
tensioning it around the package. When full
tension has been drawn, the electronic tension
detector reacts at the same time the
electromagnetic clutch energizes again.