Thread Trimmer - Duerkopp Adler 744-122 Service Instructions Manual

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8. Thread Trimmer

Function

When the material edge is registered by the light

barrier the thread trimmer swings to the left and

tensions the clamped thread chain for a secure

seam beginning.

After approx. 5 stitches the thread chain is

automatically released from the clamp. This occurs

through a short lifting movement of the thread

trimmer called the release stroke.

Appropriate to the form of the material guide rail,

the roller 13 controls the necessary avoidance

movements of the thread trimmer.

When a piece of thread chain is bound-off at the

end of a seam and the sewing drive shut off, a

stroke of the thread trimmer occurs and thus the

cutting stroke.

When the thread trimmer has clamped and cut the

thread chain, it again moves to the right. This

slackens the tensioned thread chain and thus

avoids its being pulled out of the clamp by the

material guide rail return run.

The strokes are conducted by the following

solenoid valves and dual-action cylinders:

s11 Trimmer forward, cut (long stroke)

= cylinder 1

s12 Trimmer to the left, tension thread chain

= cylinder 2

s13 Release thread chain, (short stroke)

= cylinder 1

s14 Trimmer to the right, slacken thread chain

= cylinder 2

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