Hook-To-Needle Clearance, Needle Bar Rise, Needle Height And Needle Guard - Pfaff 337 Adjustment Manual

13

Hook-to-needle clearance, needle bar rise, needle height and needle guard

.04.06
Rule
When the needle bar rise is positioned 1.8 mm after b.d.c. of the needle bar and with
maximum stitch length regulation,
1. the hook point should be at the needle midpoint and have a clearance of 0.05 to
0.1 mm to the needle.
2. the upper edge of the eye of the needle should be 0.8 mm under the hook point.
Fig. 13 - 06
O Set the maximum stitch length.
O Loosen screws 1 and 2 (screw 2 is located on the back of the machine).
O Move the needle bar to b.d.c. and slide the 1.8 mm thick feeler gauge with its cutout
tightly under the lower needle bar bearing. Move the screw clamp so that it touches the
feeler gauge and tighten it.
O Remove the feeler gauge and turn the handwheel in the direction of rotation until the
screw clamp rests on the needle bar bearing.
O Adjust the hook on the hook shaft according to rule 1
O Turn the hook according to rule 2 (readjust the needle height if necessary), see chapter
13.04.04 Needle height (pre-calibrating).
O Move the hook shaft bearing 3 until it abuts the hook and tighten the screw 2.
O Move the bevel gear 4 until it abuts the bearing 5 and tighten the screws 1.
1
3
2
1
The setting of the end play of the hook shaft and hook shaft bearing 3 is
omitted in machines with thread trimmer -900/51.
Adjustment
0.05 - 0.1 mm
4
5
11