Maier 352 - Specific Adjustments and Timing; Setting the Thread Take-up Cam

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Adjusting the looper stroke
If the long finger of the looper takes up the thread too far in front of the needle, or just
behind it, as it passes over the needle, the looper must be set forward or back, so
that it takes up the thread earlier or later. Adjusting the looper holder also adjusts the
size of the thread loop (looper stroke). To do this, slacken the locking screws (see
Fig. 17) and set the looper forward or back one full turn, using the spanner on the flat
K of the looper holder B. After making the adjustment, it is essential that screws H
and locknut I are retightened. The looper is correctly adjusted when the looper tip
crosses over the needle scarf at its deepest point (approx. 1.5 – 2.0 mm from the
needle eye). The needle movement must be adjusted accordingly.
Eccentric link joint
On class 221-19/2, 252, 261, 352 machines, and on machines in sub-class 25, the
link joint is fixed to the eccentric head by means of an eccentric bolt (see spare parts
list, page 6). Turning this eccentric bolt causes the longer finger of the looper to come
further forward at its extreme right position. At the same time, the looper is shifted
further back at its extreme left position. Conversely, setting back at the extreme right
position causes the looper to be shifted forward at the extreme left position. This
enables even more accurate positioning of the looper. The basic setting ex-works is
marked on the eccentric bolt.
A gauge block is available for basic setting of the length of the looper holder (Order.
No. V241103).
Setting the thread take-up cam
Switch off the machine!
Risk of injury due to the machine being started again inadvertently.
When the long finger of the looper is located over the scarf of the needle, the thread
should lie flat against the right edge of the thread take-up cam. (see Fig. 18)
The appearance of the seam and the thread tension setting can be influenced by
adjusting the thread take-up cam.
If the thread take-up cam is adjusted to the right, more thread is pulled through and
the size of the loop formed with the looper stroke can be reduced.
If the thread take-up cam is adjusted to the left, less thread is pulled through. As a
result, the thread tension can be reduced slightly.