Operation Manual

Buttonholes with Taper Bar
By buttonholes with taper bar the different buttonhole lengths are achieved through
insertion of the appropriate lower disc cam 1.
It determines taper bar form and length.
For exchanging the lower disc cam see Chapter 2.18.
The order numbers for the different lower disc cams can be found on the device sheets
for the 558 and 578.
The shortening, lengthening or complete shutting off of the taper bars occurs as
described above through adjusting the length setting slide and mounting of the
corresponding cutting block.
ATTENTION !
Do not set the taper bar length below the minimum or
beyond the maximum buttonhole length.
When setting the length of buttonholes with taper bar along with the cutting length the
taper bar length must also be added in.
Example: 18 mm cutting length + 4 mm taper bar length = 22 mm sewing length
Special characteristic by sub-class 558-241291:
With this sub-class buttonhole length, cutting length and taper bar length can be
changed.
For this four different
cutting length packages
(L1...L4) can be requested:
L1 for cutting lengths of 14 - 20 mm
L2 for cutting lengths of 18 - 24 mm
L3 for cutting lengths of 22 - 28 mm
L4 for cutting lengths of 26 - 32 mm
Each cutting length package includes:
–
3 lower disc cams and cutting blocks for sewing buttonholes with 3 different cutting
lengths
–
a corresponding clamp plate set
The clamp plate sets are differentiated by differing lengths for cloth clamps and thread
scissors with operating element for the short trimming of thread.
In order to assure a secure gripping and short trimming of thread and gimp the
difference in the buttonhole lengths which can be sewn with one cutting length package
cannot exceed 2 mm.
Example:
578 E 2407/L2 (Sewing device E2407 combined with cutting length package L2)
Allowable sewing lengths: minimum 24 mm
maximum 26 mm.
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