Feed-Dog Synchronisation; Basic Setting Of Balance - Bernina activa 125 Service Manual

Feed-dog synchronisation (feed-dog lift and advance)
Standard:
Pin the balance piece.
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The base shaft must now be in a position, where the
•
marker pin on the drive gear is in a front horizontal
position (09:00 hours) to the shaft.
Correction:
As both lifter and advance eccentrics are pressed into the
shaft, continue as follows:
Remove the screw (49)
•
Fold the linkage (48) down and at the same time remove
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the ball bearing (48a).
Pull the shaft (48b) and the drive gear (b) out of mesh.
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Turn the hook drive crank into the pinning position (a)
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Position the gear (b) with the marker pin at 09:00 hours.
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Move the shaft (48b) and drive gear back into mesh.
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Insert the ball bearing (48a) an tighten the linkage (48).
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Refit the screw (49).
Basic position of balance
Standard (the front cover must be removed):
Pin the balance piece 92.
•
Pin the hook driver crank.
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Pin the balance adjustment cam 107.
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Push the toothed segment all the way towards the back.
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In this position the stitch length crank 108 can now be
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pinned.
Correction:
Loosen the screw of the clamping piece 38.
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Turn the crank 39 into its pinning position.
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The toothed segment must now be against the stop at
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the same time on the opposite side, a distance of 1,1
mm must be at hand between the toothed segment and
the stop pin (see sketch).
Tighten the screw of the clamping piece 38.
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1 st tooth of gear
1 st tooth of segment
Attention: First tooth of the gear must be in the first tooth of the
segment!
107
Next: Step should be (3) hook adjustment loop lift, and then the
(4) Position of hook in relation to the needle Page 40a
107
tooth segment
39
Marker pin
92
108
38
41