Programming
Service Instructions 878-M PREMIUM - 03.0 - 10/2019 71
17.5.1 Setting the Thread trim (ThreadTrim) parameter
Various settings can be made for the thread trim. The options are explained
in more detail in the table.
Menu item Setting option
On/Off The thread trim can generally be activated or deactivated; if it is
deactivated here, it can no longer be selected at the operator
level.
Speed Speed of the machine during thread trimming.
(Value range 050 – 250 [rpm])
Start Trim° Position when the magnet of the thread trim is activated.
(Value range 000 – 359)
Stop Trim° Position when the magnet of the thread trim is deactivated.
(Value range 000 – 359)
StopBottom° Needle position at the lower dead center during the seam,
specified in degrees.
(Value range 000 – 359)
After Trim° Needle position after thread trimming before reversal.
(Value range 000 – 359)
Turn Back Reversal after trimming the thread is active or inactive.
(Value range On/Off)
StopIdle° Position of the needle after thread trimming (reversal position);
the needle is set upward to reach the full lifting height, and the
needle lever is subsequently no longer at the top dead center.
(Value range 000 – 359)
TensOpen° Needle position at which the needle thread tension switches to
the value for thread trimming (Thread Tens).
(Value range 000 – 359)
Tens.Close° Position at which the standard needle thread tension is used
again after thread trimming.
(Value range 000 – 359)
Thr.Tens. Needle thread tension during thread trimming.
(Value range 00 – 50 [%])
t TensClose Delay showing how long it takes until the standard needle thread
tension is used again.
(Value range 000 – 200 [ms])
Short Stitch Start Stitch
Number of short stitches at the seam start; advisable for neat
starts to the sewing process.
(Value range 00 – 99)
End Stitch
Number of short stitches at the seam end to ensure that the
length difference between the needle thread and the hook thread
is (visually) as small as possible.
(Value range 00 – 99)
St.Length
Stitch length of the short stitches, generally between
01.0 – 01.5 [mm].
(Value range -7.0 – 7.0)
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