Strobel 141-23EV, Mechanic'S Instructions

Page: 20 / 40

16
MA_141_142_A10-6-7-3-6-5_130617_en
4.5
Looper motion
The looper motion is determined by the stroke of the looper eccentric (F)
(Fig. 1 and Fig. 6), by the crank distance, and by the distance between drill
holes in the clamp lever. These parts are different for each machine class. The
looper motion must start and end at the same time as the needle bar motion.
The lateral looper movement is determined by the control cam and must be in
accordance with the needle motion.
The looper shaft must be mounted exactly in the center of the needle bar.
We recommend to fit the parts onto the shaft so that they can still be moved,
and to fasten them tightly only after the final adjustment.
4.5.1
Adjust the looper motion
Mark the upper dead point of needle bar eccentric (E) (Position 1).
Find and mark the top dead centre of the needle bar eccentric (equals position
"1"). (E)
The top dead centre of the needle bar eccentric is equal to the bottom dead
centre of the gripper eccentric offset by 180° (see chapter “4.5.2 Adjust the
looper eccentric (on single thread machines)”).
In this position, turn the control cam until the looper – moving to the right –
takes up the loop and reaches the turning point.
Make sure that a play of approx. 1 mm remains between control cam and
setting ring at the looper shaft, because a lateral displacement of the cam also
influences the looper movement.
If the distance is enlarged, the deflection of the gripper to the right is reduced.
The total path of the gripper hardly changes.