4-Thread Overlock - Baby Lock Celebrate BLS1 Instruction And Reference Manual

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4-Thread Overlock

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Your Baby Lock Celebrate comes to you set for 4-thread serging, which provides a very durable,
yet fully stretchable, seam or edge finish on all kinds of fabrics. With tensions properly set, the
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upper and lower looper threads lock together evenly over the cut fabric edge(s) to form a flat,
non-rolling pattern of overlocking stitches on both sides of the fabric.
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The left needle thread interlocks with both looper threads at the stitching line to create the seam.
The right needle thread, visible on the top side of the stitch, interlocks with both looper threads
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to add durability. The upper looper thread, that resembles a zig zag, on the upper side of the
fabric, is from the upper looper that moves up above the throat plate and down. The lower
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looper thread, that resembles a zig zag on the lower side of the fabric, is from the lower looper
that only moves lower than the throat plate.
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The tension on each thread is controlled by its own tension dial. Turn the dial to a higher
number to tighten or increase the tension; turn it to a lower number to loosen or decrease
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tension. The chart on the inside back cover indicates the suggested number ranges for 4-thread
stitching. On this chart, record specific settings for your own machine.
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Various threads and individual preferences may require slight adjustment to the needle thread
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tension as well. Always sew a test sample to determine if the desired result is achieved.
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Refer to the diagrams for tension guidlines.
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Wrong side
Right Needle Thread
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LN RN
Tighten
Perfect seam
UL
Left Needle Thread
LN
Right Needle Thread
RN
LN RN
UL Upper Looper Thread
LL Lower Looper Thread
Upper and Lower Looper
Thread
UL LL LN
LN
Tighten
LL
RN UL
Tighten Loosen
Left Needle Thread
LL
RN UL
Upper and Lower Looper
Thread
LN RN UL
Loosen
LL
Tighten