Specifications

7. Loosen the socket head cap screw in the locking collar of the bevel gear on the Z
drive shaft associated with the embroidery head (see Figure 2-14). This will
loosen the grasp of the Z drive shaft on the head.
8. Rotate the embroidery head upper shaft (not the Z drive shaft) until the headup
alignment tool is installed at the head’s mechanical headup position.
9. Refer to the section on gear mesh on the following page and retighten the
locking collar of the bevel gear on the Z drive shaft loosened in Step 7. This will
secure the head position.
IMPORTANT! Anytime an embroidery head is re-synchronized, you must check
and adjust the hook timing (if needed) on that head. Refer to the hook timing
procedure in the EMC 10/4 Operation Manual.
Shaft Drive Gear Mesh
Engaging the bevel gears on the Z drive shaft and the mating bevel gear on each of
the 4 embroidery heads must be a sound mechanical union. The coupling
relationship between these gears is called the gear mesh.
The gear mesh must be tight enough to avoid excess "backlash" between the
gears, while not binding (approximately .003 to .005 inch gear spacing).
When adjusted properly, you should be able to "feel" the free movement between
the mating gears, while you may not be able to "see" the movement.
socket head
cap screw
Locking
Collar
TOP, REAR of Head (gear box
cover removed)
Z Drive Shaft
(shroud removed)
Z Shaft
Bevel Gear
Z Shaft Left
Shroud
Figure 2 - 14
Z Drive Mechanical System 2 - 15
110305-01, Rev A 2. Service Adjustments