Revised 09 /2005
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84-55
MECHANICAL SETTING PROCEDURES
4.0 INTRODUCTION
This section deals with the mechanical settings for parts not found on standard Juki head.
4.1 JIG DRIVE SETTINGS
Figure 4.0 shows the jig drive assembly. On the 84-55 a jig may be driven continuously or with
an indexed motion. The settings for these two styles of motion are given in separate sections
below. Any settings common to both types of motion are also given in separate sections.
4.1.1 COMMON SETTINGS
4.1.1A DRIVE WHEEL CYLINDER
The rod end bearing ( item 8, figure 4.0) should be set so that when the cylinder is fully
extended the drive wheel is taken 3mm past its point of contact with the jig.
CAUTION :
IF THE DRIVE WHEEL TRAVELS TOO FAR, IT WILL DAMAGE THE PHOTOCELL IF THE MA-
CHINE IS RUN WITHOUT A JIG
.
4.1.1B DRIVE WHEEL SURFACE
T
he surface of the drive wheel must not be contaminated with any lubricant or silicon Aerosols
etc. Such contamination will affect jig feeding. If contamination occurs, clean the tapered
groove of the drive wheel with solvent. See section 11.0 on cleaning.
4.1.1C DRIVE ARM ECCENTRIC
The drive arm eccentric ( item 34, fig 4.0 ) is used to adjust the point of contact between the
drive wheel and the jig face in relation to the throat plate ‘D’. Location holes drilled into the
base plate, item 62, ensure the eccentric does not move from the position it has been set to.
The factory setting for the eccentric is shown by a center pop mark next to the relative hole. If
any adjustment is required slacken off nut 64 and lift drive arm item 43, up allowing the
eccentric to rotate. Ensure the pin is located in one of the holes and tighten the nut. Set the
spring 47 to the correct compression, see section 4.1.2.d.
4.1.1D DRIVE WHEEL ASSEMBLY
To replace a worn drive wheel detach the drive arm 43, from the machine bed, unfasten the rod
end bearing 21 from the drive post and remove screw 3 from the drive cylinder. Disconnect the
DC motor and clutch bullet connectors, taking care not to pull on the wires and carefully lift
the assembly out.
Undo screw 6 and remove the drive wheel and its housing 30 from the drive arm. Using the two
M5 holes in the base of the drive wheel as an anchor, loosen gear 17 taking great care not
damage any teeth on the gear. Remove the wheel from the assembly. When reassembling, care
should be taken that all surfaces are free from lint etc. the pivot spindle 28 should be lubricated
with graphite grease before replacement into the drive wheel.
ONLY GREASE CONTAINING GRAPHITE OR MOIBDENUM DISULPHATE MUST BE USED.