JUKI DLN-6390 Engineer's Manual page 29

Adjustment Procedures
1) The reduction gears inside the machine arm are composed of four gears (A, B,
C and D).
™ Reduction gear A : Gear attached to main shaft !0 (Screw No. 1 is set to the flat
section.)
™ Reduction gear B : The center of shaft is eccentric and the backlash in terms of
reduction gear A 4 is adjusted according to the eccentric
direction of the shaft.
* Adjust so that the eccentric direction of reduction gear B
shaft is on the operator's side.
When the eccentric direction is on the antioperator's side,
the adjustment of backlash at reduction gear D 8 may
not completely performed.
™ Reduction gear C : The center of shaft is eccentric and the backlash in terms of
reduction gear B 3 is adjusted according to the eccentric
direction of the shaft.
* Adjust so that the eccentric direction of reduction gear C
shaft is on the antioperator's side which is the reverse
direction of reduction gear B 3.
When the eccentric direction is on the operator's side, the
adjustment of backlash at reduction gear D 8 may not
completely performed.
™ Reduction gear D : Backlash in terms of reduction gear C 5 is adjusted by
selection of gear (A through G). (Screw No. 1 is set to the
flat section.)
2) Assembling procedure of the reduction gear
1 Make thrust collar 1 on the right side of reduction gear B shaft come in contact
with plane A of machine arm and fix it in the state of making the step section of
reduction gear B shaft come in contact with the plane of machine arm (plane A
as shown in the figure).
2 Perform the thrust removing with thrust collar 2 on the left side so that reduction
gear B 3 smoothly turns without play. At this time, align the angle of the setscrews
in left and right thrust collars 1 and 2.
3 Fix reduction gear A 4 at the position where the end plane on the right side of
reduction gear A 4 of main shaft !0 aligns with the end plane on the right side
of reduction gear B 3. (Screw No. 1 is set to the flat section.)
4 Set the eccentric direction of reduction gear B shaft to the operator's side as
described in 1), perform the adjustment of backlash between reduction gears A
and B, and tighten setscrew !1 in the reduction gear B shaft.
5 Make thrust collar 6 on the right side come in contact with plane A of machine
arm and fix it in the state of making the step section of reduction gear C shaft
come in contact with plane A of machine arm (plane A as shown in the figure).
6 Perform the thrust removing with thrust collar 7 on the left side so that reduction
gear C 5 smoothly turns without play . At this time, align the angle of the
setscrews in left and right thrust collars.
7 Set the eccentric direction of reduction gear C shaft to the operator's side as
described in 1), perform the adjustment of backlash between reduction gears B
and C, and tighten setscrew !2 in the reduction gear C shaft.
8 Insert reduction gear D 8 into the reduction gear D shaft and adjust the backlash
between reduction gears C and D by selecting reduction gears D 8.
* Reduction gears D 8 are composed of 7 steps from DA to DG. The nearer the
gear comes to DA, the more the backlash between reduction gears C and D
is increased. On the contrary, the nearer the gear comes to DG, the more the
backlash is decreased.
9 When reduction gear D 8 is determined, perform the thrust removing with
reduction gear D 8 and thrust collar 9 so that reduction gear D shaft smoothly
without play. (Screw No. 1 in reduction gear D 8 is set to the flat
turns
section.)
At this time, assemble so that the end plane on the left side of reduction gear D
shaft aligns with the end plane on the left side of reduction gear D 8.
* For the adjustment of the backlash of respective gears, adjust so that the
backlash is minimized within the range where the backlash is secured over the
full periphery of the gears.
Results of Improper Adjustment
Spec. Table for reduction gear D
No.
1 Reduction gear DA
2 Reduction gear DB
3 Reduction gear DC
4 Reduction gear DD
5 Reduction gear DE
6 Reduction gear DF
7 Reduction gear DG
25
Name of part Part No.
40003861
40003862
40003863
40003864
40003865
40003866
40003867