Pfaff coverlock 4872 Service Manual

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27. Setting the looper thread guide of the two thread chainstitch looper
Requirement:
When the looper thread guide 35 is at its highest position, the needle in its downward movement must be
positioned as shown in fig. 48.
The looper thread guide 35 must also be set so that the upper and lower clearance of the looper thread
guide 35 to the aperture on the housing are equal (fig. 49).
Setting:
● Loosen the screws 37.
● Push the looper thread guide until the looper thread guide is set as shown in fig. 49.
● Tighten the screws 37.
● Slightly loosen the screws 38 on the drive eccentric (fig. 50).
● Turn the handwheel in the normal direction until the needle is positioned as shown in fig. 48.
● Twist the drive eccentric until the looper thread guide 35 is at its highest position.
● Tighten the screws 38.
Note:
When the two thread chainstitch looper’s stitch formation is either too tight or too loose (fig. 51 + 52), this
can be corrected within the tolerance of the needle eye as in fig. 48.
Do not tighten the screws 38 too tightly, because the plastic cam could break.
Test:
● As described under “Requirement”.

Pfaff coverlock 4872 Specifications

General

Brand	Pfaff
Model	coverlock 4872
Category	Sewing Machine
Language	English