7.3.2 HEAD HEIGHT ADJUSTMENT
(blade-to-belt clearance)
The blade to conveyor clearance has been set at the factory and should not change as a result of normal
use. Although unlikely to occur, there are several reasons why this mechanism may need to be checked
or adjusted:
• If the blades are coming in contact with the conveyor tray or belt.
NOTE: It is normal for the blades to
just touch the knuckle part of the conveyor belt. Some “float” is inherent to the blade design, so that
the blade will push up .030 to .060 inches ,(.8 to 1.5 mm), before applying pressure on the blade
point.
• If the blades are not coming close enough to the conveyor belt in the standard position.
• If the blade height adjustment mechanism has to be repaired, or if the adjustment chain slips, (this
will normally bind up the high low mechanism).
To check for proper head height the following step must be followed:
The diagrams referred to below in parenthesis are located in the MACHINE INFORMATION section of
this Information Handbook.
• Set HEAD ADJUST to the STD (standard) position
• Jog (stop and start) machine until head is stopped as close as possible to the down position
• Disconnect power to machine
• Remove the main side cover
• Use a 9/16 inch wrench or socket on the nut welded to the back of the gear box drive motor. Turn the
electric motor until the cam roller (p5-7, item 9), is located directly below the gear box output shaft.
The height of the head frame is controlled by the adjustment of the roller switches, (p5-10, item 29).
They are mounted on a switch bracket, (p5-10, item 36). By slightly loosening the two securing screws,
(p5-10, item 16), the whole bracket can be carefully shifted in the direction of desired adjustment. DO
NOT OVER-RUN ROLLER SWITCH BY FORCING BRACKET IN THE DIRECTION OF A ROLLER
SWITCH BEING CONTACTED. The best way to adjust the switch(es) is given here by the following
example.
MN700-MC0010
7-3
EXAMPLE - The head is in the standard position and stopped all the way at the bottom of the stroke
as detailed above. The blades are too low. Turn the HEIGHT ADJUST switch to the HIGH position while
watching the blade to belt clearance carefully. When the blades show the proper clearance to the belt,
push in the EMERGENCY STOP button. Disconnect the power and remove the main side door to the
cabinet. Slightly loosen the switch bracket securing bolts and gently pry the switch bracket in the
direction of the closest roller switch. Listen closely for the switch to close. Tighten the bolts and replace
the side door. Turn on the machine and allow the head to be raised by the height control motor enough to
be sure the guide raiser (p5-10, item 18, actuates roller switches) has cleared the switch. Change the
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