Long Trimmer For Underthread And Gimps By Sub-Class - 221000; Position Of The Underthread And Gimp Clamp - Duerkopp Adler 558 Service Instructions Manual

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42. Long Trimmer for Underthread and Gimp by Sub-class -221000

Lever 4 for the underthread and gimp trimmer is operated by the knife

drive curve 1.

The blades 2 and 3 must move 1 mm above each other.

Roller 5 determines the swing of lever 4 through its position to the

knife drive curve 1.

Before the start of the cutting sequence at the fixed knife 7 the

underthread must be pulled between the lower clamping spring 14 and

clamping piece 13. The gimp thread must be pulled between the upper

clamping spring 12 and clamping piece 13.

For this the thread gripper must take the following position:

There must be a clearance of 49 mm between the left edge 6 of the left

clamping plate and edge 9 of the thread gripper.

There must be a clearance of only 0.3 mm between the thread

seperator 10 swinging to the left and the tips of the thread gripper.

For a sure insertion of the underthread before cutting the clamping

spring 14 is opened by the operator 11 via pin 8.

The opening width is thereby dependent on the thickness of the

underthread used. With too large an opening width the underthread

can jump back after cutting.

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