A typical dimension for the gap between the relaxed solenoid plunger and needle
bar driver reciprocator is approximately 0.015 to 0.045 inches (0.4 to 1.1 mm) as
shown in Figure 3-18.
To obtain this gap, loosen the locking nut on the solenoid and rotate the solenoid
inside the bracket until the gap is proper. Tighten the locking nut.
Bracket Positioning
When attaching the jump stitch solenoid and bracket, it is not only necessary to
place the plunger correctly, but you must also position the assembly in the proper
forward to backward relationship. There are three concerns in positioning the
solenoid and bracket assembly:
Bracket
Position 1
The solenoid and bracket assembly should be far enough forward so the plunger
will cause the reciprocator to rotate enough to release the needle bar during the
jump stitch cycle.
Bracket
Position 2
The solenoid and bracket assembly must not be so far forward that it causes the
reciprocator to rotate to its mechanical rotational limit. This may cause premature
failure of the reciprocator mechanism.
Bracket
Position 3
The solenoid and bracket assembly must not be so far backward that it contacts the
embroidery head connecting rod during its mechanical motion.
Needle Bar Driver
Reciprocator
Jump Stitch
Solenoid
Gap 0.015"- 0.045"
(0.4 - 1.1 mm)
Drawing Not To Scale
Figure 3 - 18
3 - 18
Needle Case
EMT 1 Technical Manual
Melco Embroidery Systems
