Bernina L 850 Quick Reference

mtc micro thread control

Setting the Differential feed

Default value

The differential feed in default setting 1
for flat and even seams.
Stretching
To prevent seam puckering, reduce dif-
ferential feed to a value between 0.7 and
1.
Gather to fit
To prevent waving increase differential
feed to a value between 1 and 2.
By default mtc micro thread control is always set to position
«0». The mtc micro thread control affects the amount of
looper threads around the fabric edge and can be adjusted
continuously during sewing.
> To enlarge the loops of the thread at the fabric edge,
turn the mtc micro thread control clockwise (+).
> To minimize the loops of the thread at the fabric edge,
turn the mtc micro thread control counterclockwise (-).
The two feed dogs can be geared to each other so that the
fabric is fed evenly while sewing and that neither wavering
nor unintended gathering occurs.
The differential feed is variable while sewing.

Gathering

To gather intentionally, increase differen-
tial feed to a value between 1.5 and 2.
An elongated stitch length enhances the
gathering effect.
L 850
4-Thread Overlock with Integrated
1
Safety Seam
2
3-Thread Super Stretch
3
3-Thread Overlock Wide (LN)
4
3-Thread Overlock Narrow (RN)
5
3-Thread Flatlock Wide (LN)
6
3-Thread Flatlock Narrow (RN)
7
3-Thread Narrow Seam
8
3-Thread Rolled Hem
2-Thread Wrapped Overlock Wide
9
(LN)
2-Thread Wrapped Overlock Narrow
10
(RN)
11
2-Thread Flatlock Wide (LN)
12
2-Thread Flatlock Narrow (RN)
13
2-Thread Rolled Hem
14
2-Thread Overlock Wide (LN)
15
2-Thread Overlock Narrow (RN)
28
2-Thread Blanketstitch Wide (LN)
29
2-Thread Blanketstitch Narrow (RN)
30
3-thread picot stitch
This quick reference doesn't replace the instruction manual of the machine.
For complete information, please refer to > Instruction manual
CW R/O SL DF ULC
4 4 4 4 6 O 2,5 1
4 4 ─ 4 6 O 2,5 1
4 ─ 4 4 6 O 2,5 1
─ 4 4 4 6 O 2,5 1
2 ─ 4 7 6 O 2,5 1
─ 2 4 6 6 O 2,5 1
─ 4 4 4 7,5 R 2 1
─ 4 4 5,5 5,5 R R 1
4 ─ ─ 4 6 O 2,5 1
─ 4 ─ 4 6 O 2,5 1
1,5 ─ ─ 4,5 6 O 2,5 1
─ 2 ─ 4 6 O 2,5 1
─ 4 ─ 4 5,5 R R 1
2 ─ ─ 4 6 O 2,5 1
─ 2 ─ 4 6 O 2,5 1
2 ─ ─ 4 6 O 4 1
─ 2 ─ 4 6 O 4 1
─ 3,5 3,5 5 6 R 2,5 1
!