Settings and Adjustments 71
Holder Shear Adjustment
The force with which each side of the holder shear holds the ribbon is adjustable. This
adjustment is made simply by loosening and moving the cam follower mounting plates
closer or farther away from the cam (with the cam turned towards the desired plate). Due
to minor variations in castings, it is usually necessary to make these adjustments if the
holder shear is being replaced.
While it is important to have sufficient tension to hold the ribbon, it is also important not
to have too much force on the cam followers. When there is no ribbon being held in the
holder shear, the cam should be able to be easily rotated 360° by hand with no slack in
the holder shear. If binding is felt at either end of movement, then that side is adjusted
too tightly and should be loosened. However, there should be no side-side movement.
After adjusting the holder shear, always verify that the ribbon is being held tightly enough
on each side by threading the Servo Tyer and pulling on the ribbon by hand. Normally the
ribbon will break before being pulled out of the holder shear.
Cam
Mounting
Adjusting the holder shear to tightly may result in damage to the
holder shear pivot bolt, motor and/or encoder.
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