Pfaff 3834-3/11, Instruction Manual, Page: 32 / 48

32 PFAFF
Determine the roller presser feed motion for fullness application
Example: seam segment 2 (fig. 20)
Length of seam segment 2, measured at sleeve hole = 100 mm
Selected stitch length (feed wheel) = 2.5 mm
Number of stitches in seam segment 2 = 40 stitches
(100 mm : 2.5 mm stitch length)
Lenght of seam segment 2, measured at sleeve = 112 mm
Roller presser feed motion: 112 mm : 40 stitches = 2.8 mm
Note:
Depending on the feed behaviour of the material used in the process and on the location of the seam in
relation to warp and weft threads it may be necessary to edit the determined value a little bit.
Basic sizes and size tables for grading
Grading means the gradual derivation of smaller and larger sizes from a certain basic size (see fig. 21).
The basic sizes that are indicated in the relevant tables constitute the basis for the creation of sewing
programs with grading.
Based on these basic sizes the control increases or decreases the seam segments with grading by the
factor indicated in the table when another size is selected. Grading values from 0 to 50 mm can be
inputted.
Example: 1 mm grading in seam segment 1
4 mm grading in seam segment 2
Length of seam segments in basic size 50 (factor 0)
Seam segment 1 = 35 mm
Seam segment 2 = 100 mm
Length of seam segments in size 48 (factor -1)
Seam segment 1 = 34 mm
Seam segment 2 = 96 mm
Length of seam segments in size 56 (factor 3)
Seam segment 1 = 38 mm
Seam segment 2 = 112 mm
Fig. 21 Fig. 20
seam segment 2