JUKI LK-1900AN Engineer's Manual page 23

1. Mount the main shaft 7 according to "1) Main shaft connection/disconnection." Assemble the crank
rod unit !2 .
2. Mount the frame while the oscillator !0 and the oscillator arm !4 is passed through the oscillator shaft
6 .
3. Pass the thrust collar !1 through the oscillator shaft 6 . Lightly push the oscillator shaft 6 in the direc-
tion of the arrow C and the thrust collar !1 in the direction of the arrow D. Tighten the two set screws 5 .
(Make sure that the first screw touches flatly on the oscillator shaft 6 .)
4. Fix the oscillator !0 and the oscillator arm !4 according to "(7) Oscillator gear positioning."
5. Lightly swing the crank rod unit !2 with a finger in the direction of the arrow. Decide the positioning of
the crank rod unit !2 so that it stays in the center of swinging.
Tighten the two set screws 9 and then fix them so that the crank rod unit !2 is not displaced from the
center of swinging.
(Tighten the first screw first so that it comes in contact flatly with the main shaft 7 . Then, tighten the
second one.)
6. Mount the lengthwise feed motor 2 and the crosswise feed motor mounting plate 3 , using the two
set screws 1 and four set screws !3 .
Refer to "(27) Adjustment of the position of the X feed motor and the Y feed motor (Adjustment of the
backlash of the driving gear)."
(Caution) 1. Try to turn the main shaft 7 and confirm that there is no torque.
2. In the case of connection/disconnection or positioning of the crank rod unit !2 or
positioning of the oscillator !0 , grease-up treatment is always needed for the spec-
ified places (2 positions) and the gear area E of the oscillator !0 .
3. Actions for the crank rod unit !2 (under-cam 8 ) positioning must be taken without
fail, after doing "(7) Oscillator gear positioning."
Inadequate positioning of the under-cam 8 and the oscillator !0 can cause of the
frictional wear or lock-up.
Procedures of assembling
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