19 MA_141_142_A10-6-7-3-6-5_130617_en
4.5.5 Set the looper in its front position to the feed cup
The looper reaches its utmost front position on moving approx. 45 degrees
opposite to direction of sewing. To be set as per measures (H) – see chart. It is
important that the height of looper and shaft is properly adjusted. (See chart)
It has to be controlled if measure (L) consides with looper shaft set as
described at chart page 30 and 31, readjust, if necessary.
4.5.6 Adjust stroke of loop
Each machine requires a certain stroke of loop (B) (see chart), which is
regulated by turning the control cam and the looper eccentric; measured from
the needle’s front dead point to the point where the looper stands above the
center of the needle.
To obtain a large stroke of loop - turn cam and looper eccentric opposite
to the machine’s direction of sewing.
To reduce the stroke of loop - turn cam and looper eccentric in
direction of sewing.
Then the looper takes up the loop and puts it – as straight as possible –
backwards on the sewing material.
4.5.7 Adjust the front bearing block
The height of the front bearing block (M) (Fig. 1 and Fig. 6) is specifically set for
each machine. The looper motion depends on the control cam and can be
altered as follows: To increase the looper motion to the right, put a distance
plate under the bearing block. To reduce it, take off the distance plate.
4.5.7.1 Basic dimensions for front and rear bearing block
Manufacturing constructs the machine housing to a certain dimension. To get to
a different basic dimension for the various sub-classes, spacer plates of the
required thickness are placed underneath the bearing block when necessary.
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