promelectroavtomat LS-2220 Manuale utente
2. 2001.
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• This service manual was compiled for use when repairing the LS-2220, 2720 Zigzag Stitch Sewing Machines.
• Use this manual, together with the Parts Catalog, when making repairs.
• This manual was written based on the most up-to-date product specifications at the time of printing.
Some machine specifications may have been changed to improve the quality of the product.
Contact the manufacturer or your local sales representative for information on such changes.
• Symbols used
Move the part in the direction of
the arrow.
Set the clearance as indicated.
Move the part to its highest or
lowest position.
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CONTENTS
Removing order of covers....................................................................................................................................1
Clearance between the needle and the shuttle hook point (Shuttle race position)........................................2
Clearance between the shuttle driver and the race way...................................................................................3
Needle swing (Parabola).......................................................................................................................................4
Needle down centering.........................................................................................................................................5
Loop lift..................................................................................................................................................................6
Height of the needle bar.......................................................................................................................................7
Tension of the timing belt.....................................................................................................................................8
Height of the feed dogs........................................................................................................................................9
Height of the presser bar....................................................................................................................................10
Adjusting the buttonhole’s left backward stitching and right forward stitching..........................................11
Adjusting the buttonhole’s right forward stitching width...............................................................................12
Upper tension control dial..................................................................................................................................13
Bobbin Winding...................................................................................................................................................14
Adjustment of lower thread tension..................................................................................................................15
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- 1 -
Removing order of covers
• Remove accessory table (A).
• Loosen and remove the screw then remove the face plate (B).
• Loosen and remove the screws then remove the front cover (C).
• Loosen and remove the screws lower the presser foot lifter, then remove the rear cover (D).
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- 2 -
Clearance between the needle and
the shuttle hook point (Shuttle race position)
Standard
• The shuttle race should be positioned correctly with respect to the turning direction of the shuttle race..
• Clearance between the needle and the shuttle hook point should be 0.02 to 0.1mm.
Adjustment
• Set the pattern selection dial to 6 .
• Turn the balance wheel to set the needle and the shuttle hook to the correct timing position .
• Turn the needle bar supporter stud slightly to either the right or left and adjust the clearance
between the needle and the shuttle hook.
Note: The center of the needle should align with the center of the shuttle hook shaft.
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- 3 -
Clearance between the shuttle driver and the race way
Standard
• The shuttle driver should rotate smoothly, no play should be felt in the race way.
Adjustment
1. Loosen setscrews of the driver shaft gear .
2. Adjust the clearance of the driver shaft .
3. Retighten the setscrews .
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- 4 -
Needle swing (Parabola)
Standard
When the pattern selection dial is set at 4 (Zigzag), the needle swing should be 0.05 mm or less while the
needle moves down from the needle plate to its lowest position. While the needle moves up from its
lowest position to the needle plate, the needle swing should be 0.15 mm or less. These clearances
should be on both sides of the needle plate hole.
Adjustment
1. Set the pattern selection dial to 4 (Zigzag).
2. Loosen the three set screws on the worm gear.
3. Turn the worm gear to adjust the needle swing.
4. Tighten the three set screws on the worm gear.
Note: Make sure that the biting worm gear aligns with the pattern cam gear.
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- 5 -
Needle down centering
Standard
• When the pattern selection dial is set at 4 (Zigzag), the needle should move within a range of 5.0 to
5.4 mm across the needle plate. When the needle is lowered, it should not be too close to either the
left or right edge of the needle plate hole.
Adjustment
1. Set the pattern selection dial to 4.
2. Turn the balance wheel to lower the needle until it is just above the needle plate.
3. Loosen the locknut for the adjusting screw on the zigzag connecting rod.
4. Using a screwdriver, turn the screw and adjust the needle movement range with respect to the needle
plate hole.
5. Tighten the locknut .
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- 6 -
Loop lift
Standard
• When the pattern selection dial is set at 4 (Zigzag) and the needle is raised 1.7 to 2.1 mm from its
lowest position on the left side, the shuttle hook point should align with the side of the needle.
Adjustment
1. Set the pattern selection dial to 4 (Zigzag), then lower the needle to its lowest position at the left side
of the needle plate.
2. Loosen the set screw on the drive connecting rod.
3. Raise the needle between 1.7 and 2.1 mm and align the shuttle hook point with the side of the needle.
4. Tighten the set screw .
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- 7 -
Height of the needle bar
Standard
• When the pattern selection dial is set at 4 (Zigzag), and the needle is on the right side and contacts the
shuttle hook, the clearance between the top of the needle eye and shuttle hook point should be within 0.8
and 1.2 mm.
Adjustment
1. Set the pattern selection dial to 4 (Zigzag), then lower the needle to its lowest position at the right side
of the needle plate.
2. Turn the balance wheel until the needle contacts the shuttle hook.
3. Loosen the set screw on the needle bar.
4. Move the needle bar either up or down until the clearance between the top of the needle eye and the
shuttle hook point is within 0.8 and 1.2 mm.
5. Tighten the set screw .
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