U.S. BLINDSTITCH MACHINE CO.
IS A DIVISION OF NEW YORK SEWING MACHINE ATTACHMENT CORP.
2011-15 85th Street, North Bergen, NJ 07047
•
Web: www.usblindstitch.com
Tel: 201-809-2009 • 1-800-225-2852 • FAX: 201-861-9201 • e-mail: [email protected]
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6. Once the looper is timed with respect to the needle as outlined in paragraphs 2 thru 5 above,
slowly turn the handwheel in a direction away from the operator, until the looper approaches the
edge of the looper slot. (Point “C” in Figure 8) in the presserfoot. At this point make sure the
small prong of the looper clears this edge. If it does not clear, adjust the eccentric block as outlined
in paragraph S until the interference is eliminated.
6A. If timing of looper still proves difficult, its possible that looper sweep required adjustment.
If looper is too close to chain off pin and also, too close to needle guide on opposite position,
the looper sweep is too short.
If looper on pick up stroke, is too far to right of chain off pin and too close to needle rest at left
of presserfoot, the looper sweep is too wide.
For adjustment, refer to insert illustration (Figure 6). To widen looper sweep,
flex or bend looper crank in direction of arrow “H”.
To shorten loopersweep, flex or bend looper crank in direction of arrow “J”
Both adjustments should be gradual and sweep checked frequently.
7. Continue turning the handwheel away from the operator until the point of the needle starts
to enter the area in between the looper prongs. (Refer to Point "D" in Figure 8). If the needle
strikes the crotch of the looper, the looper has generally been set too far forward. Check to see
if the looper has been inserted into the clamp as far as it will go. It should be inserted until the
shoulder on the looper is stopped on the clamp. If this check is satisfactory, recheck the distance
from the center of the looper rod fork pin to the rear face of the looper rod ball. Refer to paragraph
4 and reset if necessary. If neither of the above two measures corrects the problem, it is possible
that the needle lever may be set too low and required adjustment.
8. Once clearance is established between the needle and the looper crotch, continue turning
the handwheel away from the operator until the needle passes between the looper prongs,
clearing both the long and the short prong. If difficulty is experienced at this point, it may be
necessary to modify some of the previous adjustments to the eccentric block or the looper rod
length. If this is done, recheck the previous points to insure that a position is established which
will satisfy all of the clearance conditions.
FIGURE 8
From
the
library
of:
Diamond
Needle
Corp