3. TENSION. When LS1 is closed,
the electromagnetic clutch energizes and
the cam shaft rotates approximately 45
degrees. This small amount of shaft
rotation is controlled by LS3, mounted at
the right-hand end of the cam shaft.
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
detector reacts at same time, the
electromagnetic clutch energizes again.
LS1 DETECTION
LEVER
END
GRIPPER
TENSION
ROLLERS
TENSION
LEVER
PACKAGE
ELECTROMAGNETIC
CLUTCH
END
GRIPPER
CLOSED
HOME
SHAFT
ROTATION
CAM SURFACE
LS3
CAM SURFACE
LS5
CAM SHAFT
FIGURE 15. TENSION
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