[]]. Left Hand Looper And Need1E Bar Adjustment - Singer 812U Instruction Manual

1. Adjusting stitch length
(I) A desired stitch length can be selected by means of the
scale on main feed arm
~
, which can be adjusted as
follows:
(a) Pull and open feed mechanism cover B
tI;)
on the
back of the machine.
(b) Loosennut
~.
(c) Move feed link indicator plate
G
until its red·
mark is in line with that number on the scale
which represents your desired stitch length.
(d) Retighten nut ~ securely.
.
(2) Adjust the seale on differential feed arm
0
in the
same way as the seale on main feed arm
~
.
.:
..
~
Differential
Specifi-
Main feed arm
feed arm
cations
Run stitching
3.6mm 6.5 mm
Denim
Rufller 3.3mm 9.0mm
. Bulky
2.5mm
9.0mm
2. Adjusting the differential feed
(The figures below apply to the case of the maximum stitch length in run stitching.)
Caution:
If the main feed arm
~
anddifferential feed arm
0
are set to any
scale figure larger than those shown at right, the feed dogs will hit
the edges of the slots in the throat plate.
.-----0
(1) In case of stretch sewing
Set the scale on differential feed arm
0
to a smaller
number than that of the scale on main feed arm
~
.
o
9
8
(2) In case of gather sewing
Set the scale on differential feed arm
0
to a larger
number than that of the scale on main feed arm
~
.
D. STANDARD ADJUSTMENTS
m.
Left hand looper and needle bar adjustment
S~,.~._l1
mm
L\
" " " " , . ~ - ;
High-lift
~
J
. specifications 11.5 mm
t
W:í;~
(1) In case of sewing machines made to the standard
specifications, adjust the distance between the needIe
point and the top of the throat plate to 11 mm when
the needIeis up highest.
The sewing machine of the high-lift specifications must
be adjusted to a distance of 11.5 mm between them.
*
Turn the needIe bar about overedge-needIe
O
until
double-chain stitch needIe
8
is in líne with the center of
the hole in the throat plate.