Singer 812U User manual

INSTRUCTION MANUAL
FOR
SINGER 812U
Safety Stitch Machine
THE SINGER COMPANY

* These models have the same sewing performance as the high-speed t ypes (Model 842U) so they
can be used for run stitching , ruff1ing, bulk y stitching and many other applications.
* Differential feed ratio can be changed by a qu adrant shaped adjustrnent which assures awide
di fferentiaI range.
*Blade engaging angle can be easily adjusted for sharp cutting performance .
'* Most of the gauge parts , expendable parts, att achments and other devices of these models are
interchangeable with those of Model 842U.
i

CONTENTS
~ .
~ ~ 3
[I]. Machine head installation ~......................... 3
121. Sewing speed 3
~ . Motor pulley and belt ,. 3
~. Be1t and belt cover insta11ation 4
15l. Thread unwinder insta11ation 4
I§]. Eye guard installation 4
~!!i!!!!!i!1I!!!I· .... ·· .. · .. ····· .... · .. ··· .... · .. ·· .. · .. ···· .. · .... · .... · .. ····· .. ·....................................... 4
,
[I] . Type of oil ,. 4
121. Lubrication and oil change ,. 4
~~~.~................................................................................................................. 5
[]]. Need1e and thread 5
121. Setting need1e····..·· ·····..·..······ ··..········..··········..·..···..·····..·········..·..····· ·······..········ ····..····· 5
~. Threading 5
~. Thread tension '" ,. 6
1Sl. How to sew 7
I§]. Bight adjustment 8
ILI. Stitch length and differentia1 feed adjustment 8
9
[]]. Left
hand looper and need1e bar adjustment 9
121. Right hand looper adjustment 10
13J. Do~b1e-ehain stitch looper adjustrnent 11
~. Kníves adjustment 11
1Sl. Feed dogs adjustment 12
•
.......................................... 12
~i
rn. Taping 'ç: ~.................................... 12
Vi ,........................................................................... 13

:' SPECIFICATIONS
THE SINGER
COMPANY
81 2UI-/ I
MAOEIN.JAP~
/,lf
~
Feed dog
+[)j m
~
Ll1
4
~/
==
(Main)
es
~
00
16
~ ~
Sub elass
Max.
Presser
~ ~
No.
Needle
slileh
1001
Needle
Sewing
Slilch
No. 01
No. 01
gaoge
Bighl
lenglh
Dillerenlial
lifl
Pile h
(Oiltlll.mO
size
speed
Use
Devim
Iype
Needles
Ihruds
(mm)
(mm)
(mm)
ralio
(mm)
(mm)
lype
(Ca!.No.)
(r.p.m)
I~
Light marerials
061 - 3 3
7
0.3-
(6120)
252 3.6
IA
41.6
I~
5000 Blouses Setnng steeves -
#11
Forming sleeves
-4
4Dressshirts Joining body par ts
I~
Lfght materiais
~
0.3-
(6120)
062-3
24233.6 41.6
;~
#11 5000 Blouses
Setting sleeves -
1.8
Forming sleeves
Dressshirts Joming body parts
I~
Light &medium-heavy materiais
063-3
3
~
0.3-
(6120) Setting sleeves
-4
25343.6 61.6
I~
#14 500Q
Jurnper
Forming sleeves -
1.8 Pajamas Joining body
parts
-5
5Ladies' &Joiníng inner leg
children 's wear edges
I~
Light &medium-heavy materiais
7
0.3-
(6120)
Setting sleeves
064-5
24353.6 61.6
;~
5000
Jumper
Forming sleeves -
1.8 #14 Pajamas Joining body parts
Ladies' &Joining inner leg
children's wear edges
I~
Medium-heavy &heavy materiais
065-5
56
~
0.3-
(6120) 5000 1Setting sleeves
25 5 3.6 1.6
!n
Overalls Forming sleeves -
71.8 6.5 #16 Work pants Joíning
body parts
-7
Ladies' wear Joining inner leg
edges
I~
Medium-heavy &heavy rnaterials
7
0.3-
(6120) Setting sleeves
066-5
2 4 553.6 6 1.6
!n
5000 Overalls Forming sleeves -
1.8 #16 Work pants Joining
body parts
Ladies' wear Joining inner leg
edges
7If.
RufOíng light &
rnedium-heavy materiaIs
0.3-
(6120)
067-4
25 2 4 3.3 5 1.6 5000 Blouses
Setting sleeves Ruffler
-/ftj
2.7 #14 Setting cures
OU
Neglige
Setting Irills
7If.
Ruffling light &
medium-heavy materiais
0.3-
(6120) 5000 Ladíes' &
069-5
25 3 53.3 5 1.6 childrert's wear Setting sleeves Ruffler
2.7 #14 Blouses
Selting cuffs
--/t;j Setting ftills
~-
OU
Neglige
~
~~,
Ruffiing medium-heavy &
071 -5
heavymaterials
5
0.3-
(6120)
2553.3 51.6 5000 Ladies' &
Setting sreeves Ruffler
---/@'
62.7
#14
childrert's wear Settíng cuffs
-6
Selling frills
êl~~
~
Ir.
Ruffling light &medium-heavy
materiais (Piping)
0.3-
(6120) Bínder
073-4
252 4 3.3 51.6 5000 Ruffler
2.7
#14
Blouses Setting sleeves Tape
~
Selling cuffs
winder
UB
Neglige
Selting f,li,
-1 -
r

~. Belt and belt cover installation
Installingthe belt Installing lhe belt caver
(1) Adjust the nut fD so that the belt
will give in about 10 mm when
depressedwith finger.
(2) Operating direction is clockwise.
(1) Install the stud @) on the ma-
chinehead. (2) Install the belt cover
4D) on the
stud@).
IS. Thread unwinder installation
. Five threads unwinder
[Q]. Eye guard installation
(l) Install the thread unwinder in the far right comer (l) Install the eye guard .on the faceplate cover 4B .
of the table with screw, making sure that it will not
interfere with machine operation.
B. LUBRICATION
[IJ. Typeof oi!
Usethe oil (viscosity37.Soe SUS70)suppliedasaccessory,
[2). Lubrication and oi! change
1. Oilsupply 2. Drainingoil
All oil has been completely. discharged from the machine When draining the oil, removescrew
.. as shownat above.
prior to shipment. Before operating machine, remove Changethe oil after 100hours of runningin.
oil cap. by tuming it counterclockwise, and pour oil After that períod, change the oil about every 3 months.
in until oil level reaches the upper reference line, using
the accessoryfunnel.
- 4

3. Oilingpoints
o
,.' .
......
When operating the machine for the first time.after unpacking it, or after a long period of non-use, be sure to pour a few ..
drops of oil on
need1e bare and right hand looper holder8.
• If the machine is used every day, it neednot be oiled daily.
But few drops of oil on
on1y right hand looper drivinglever @) once a week.
m. Needle and thread
Select a need1e and thread by referringto the table below.
Needle Needle thread Looper thread
Fabrics Type Size Type Size Type Size
Broad cloth
Cato No. 6120 #11 Cotton #80 Cotton #80
..
#11 Dacron #80 Dacron #80
Jersey
..
#14 Dacron #50 Textured nylon yarn 110/2 denier
Cabardine
..
#16 Cotton #50 Cotton #50
'Denim CatoNo. 6122 #21 Cotton #30 Cotton #30
[2]. Setting needle
(1) Turn the pulley until the need1e bar is raised dose
to the highest position, press down presser bar lifter
0, and swing out presser arm8 in the arrow direc-
tion.
~. lllreading
I
1
J
I
Long-groove side must
be facing front.
I
Back_
i:
(2) Loosen need1e clamp screw8, hold the need1e with
its long groove facing front insert the
need1e all the
way into the
need1e clamp hole, and then tighten
the
need1e clamp screw.
(3) Install trimming knife Oon the maio presser
armo
Then, passthe thread in the order of the nurnbersshown.
Before threading, open face plate
cover., front cover@) and
cloth plate (D, turn the pulley until the
need1e is raised up híghest,
and then swingout presserarm
•.
~IIJJ:')íJIl.~~~'t~l _00
\--0
0--"-
(t-
•
- 5

In case of four-thread In case of five-thread
8 00 O8
0080
.:.:. '.:
.' ..... -;
.';-.
~. Thread tensian
Thread tension rnay require change depending on fabrics and threads used, bight, stitch length, the position of each
thread take-up, and the position
of the thread guides.
If necessary, adjust as mentioned below.
®
o
G
1. Adjusting the overedgestitch needle thread take-up,
To increase the thread tension, lower needle thread take-uptD .
To decrease it, raise the thread take-up. The center position in
the adjustable range is standard.
2. Adjusting the double-chain stitch needle thread guide.
Raise double-chain stitch needle thread guide @) to increase the
needle thread tension.
Or lower it to decrease the tension.
The standard needle thread tension is obtained when the guide
is in
the center stitch position.
Use the thread take-up for two-thread ®or for three-thread ®
as appropriate to your sewing purpose.
3. Adjusting the overedge stitch looper thread take-
ups and thread guide. . 4. Adjusting the double-chain stitch thread take-
up and thread guide.
=--~ Set screw
~
6'
Reference ""'~ ~Loo~
4fj Tighten \1
About6 mm
OQlOI
E1J
Right hand looper J,==8~~1=:::::::::=::::::I
thread guide
Looper thread
take-ups Jeft
(1) The above figure shows the standard positions of the
looper thread take-ups and each thread guide when
the needle bar is up highest.
(2) More thread will be fed when looper thread take-ups
right 4D, mare raised; and less thread when they are
lowered.
(3) More thread will be fed when left hand looper thread
guide
f& is moved to the left (more angle); and less
thread when it is moved to the right (less angle).
(1) Thread take-up thread guides, right ~ and left fi) ,
must be positioned symmetrically in the thread take-
up thread guide hole with the reference line on thread
take-up holder(li) in the center.
(2) Thread handler fD must be positioned parallel to the
thread take-up holder.
(3) Adjust the timing of double-chain stitch thread take-
up assembly «;
to pull back the looper thread when
the needle bar is in the highest position.
(The height
of the double-chaín stitch thread take-u p)
assembly from the thread take-up holder is about
6mm.
(4) The looper thread loosens when the double-chain stitch
thread take-up assembly is advanced (turned counter-
c1ockwise), and tightens when
it is delayed (tumed
clockwíse).
- 6

5. Presser foot pressureadjustment
(1) Adjust the presser foot pressure with presser foot adjustingserewfi) .
6. Thread tension
Measure the thread tension as shown at below.
(Needle thread tension) (Double-chain stitch looper thread tension)
(Looper thread tension)
LTension disc
~Tension gauge J
,------------
Adjust the tension of each thread by referringto the table below. (In grams)
Thread Double-chain Double-chain Overedge Right hand Left hand
Fabrics stitch needle stitch looper needle looper looper
Kind Size thread tension thread tension thread tension thread tension thread tension
Cotton #80 20 - 50
5-
15 40 - 90 10- 25
8- 20
Broadcloth Dacron #80 15 - 45
5- 10 30 - 80 8- 20 5-
15
Needle=Dacron #50 <,
Jersey Looper=Textured nylon yarn 110/2 denier 25 - 60
8- 20 25 - 50
5- 15
8- 20
Gabardine Cotton #50 35 - 60
6-
15 50 - 100
7- 20 10 - 30
Denim Cotton #30 80 - 110 10 - 20 70 - 150 10 - 25 15 - 30
[Sl. How to sew
(1) Press the push power switch ON.
(2) Depress presser bar lifter pedal
«1>, plaee a small part of the work under the presser foot, and release the presser bar
lifter pedal.
(3) When treadle fIj)isdepressed, the work willbe fed and sewn.
(4) After sewing,run the machíne without the work until about 5 or 6 em of thread is out, and eut the trimming knife
fi by pullingthe thread toward yourself.
- 7 -

..... :',
~. Bight adjustment
Since bight depends on cloth trímrning width and the width of the throat plate's chain off fínger, cloth trímming
width must be changed at the same time in case of changing bight by more than I
mm.
1. To increase bight
•
(l) Loosen movable knife holder set
screw
0, move knife holder @)
to right as much as necessary,
and retighten the set screw 0
securely.
(2) Loosen stationary knife holder
set screw f)) , and make the sta-
tionary knife pushed against the
movable knife by the stationary
knife holder spring.
(3) Tum the pulley until the rnov- .
able knife dose to its lowest
position and retighten the sta-
tionary knife holder set screwf)).
2. To decrease bight
(l) Loosen the stationary knife hold-
er set screwf)),move knife holder
~ to left as much as necessary,
and temporari1y tighten the set
screw
f).
(2) Loosen the movable knífe holder
set screw 0, move the knife hold-
er until the movable knife con-
tacts the stationary knife, and
retighten the set screw 0secure-
ly.
•
.~
(3) Loosen temporari1y tightened set
screw
f), make sure that the
stationary knife is pushed against
the movable knife,
tum the pulley
until the movable knife close to
its lowest position, and retighten
set screw
f) .:
7.94mm
(Stationary knife)
, 1.5mm
"--2mm
(Movable knife)
'* In case of angle knife,
please unfasten screw
oand do same ad-
justment.
Angle knife
Caution:
lf the knife cutting performance has dropped, sharpen
the movable knife or stationary knife as shown in right.
Ll]. Stitch length and differenti~1 feed adjustment
The numerals on the scales ofmain feed arm ~ and differential feed arm flI indicate stitch length in millimeters,
but actual stitch length varies with the kind and thickness
of the material and the differential feed.
8 -

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 Guntil 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 0in 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 0are 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 0to 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 0to 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 Ountil
double-chain stitch needIe8is in líne with the center of
the hole in the throat plate.
-' 9 -

'." '
...- ~
,---
- ~
~
"
I;:
\ v!
iIStandard
--J Lspecifications 4.7 mm
iIHigh-lift
specifications 2.2 mm
(2) Tilt the left hand looper by 1- 1.5mm, insert it ali the
wayinto the left hand looper holder, and ínstall it. (3) In case of sewing machine made to the standard
speci-
fications, adjust the distance between the left hand
looper point and the needle center to 4.7 mm when
the left hand looper ís at the left-most position.
The sewing machine of the hígh-lift specifications must
be adjusted to a distance of 2.2 mm between them.
,r--- 0- O.OS mm
(5) Foregoing the condition of (4), push the needle with
movable needle
guard. until there is a clearance of
O - 0.05 mm between the needle and the point of the
left hand looper.
\
L- 0.01 - O.OS mm
Push needle
(4) With the point of the left hand looper in line with tne
center
of the needle, make an adjustment so that the
point of the left hand looper will push the needle 0.01
- 0.05 mm (i.e.,
slight1y contact the needle) in the
upward travel of the needle.
~. Right hand looper adjustment
,..----------------------------....
There are right hand loopers: Standard type, high-lift type,
B A
Meeting point
(2) Select meeting measurements fromthetable below.
(1) Make an adjustment so that, when
right hand looper 8meets left
hand 100perCi), the point of the
right hand looper will pass clear of
the left hand looper about 0.1
mm below its projected parto
. (In millimeters)
~c.
Standard .High-Iift
A7.2 8.2
B
S.O
S.O
(3) The meeting measurements of
spreader (for two-thread) (Dare
the same as those of the right
. hand looper.
'* Check part ©on the right hand looper arrn and see whether the machine is for
standard use (S) or high-lift use (H).
- 10 -

[3]. Double-chain stitch looper adjustment
(2) In case of sewingmachínes made to the standard speci-
fications, adjust the distance from the looper point to
the center
of the needle to 1.5 mm when the double-
chain stitch looper is at the left-most position. The
sewing
machineof the high-lift specifications must be
adjusted to a distance of 1.3 mm between them.
--- Screw recess
(1) Install the double-chain stitch looper oby inserting
it all the way into the double-chainstitch looper holder.
The inclination of the looper depends on the screw
recesso
n
Standard
specifications 1.5 mm
High-lift
~ specifícations1.3 mm
..
~O-05mm
(3) Adjust the clearance between the point of the double-
chain stitch looper and the needle to somewhere from
0- 0.05 mm when the double-chain stitch looper point
comes to the center of the needle during the needle's
rising
processo
(
If stitches skip, the double-chain stitch looper POint)
must be so adjusted as to contact the needle 0.05 -
,0.1 mm deep. .
. \41. Knives adjustment
-1 0.3 - 0.5 mm
(4) Foregoing the condition of (3), push the needle with
chain stitch needle guard
B. until there is a clearance
of O - 0.05 mm between the needle and the point of
the double-chaínstitch looper.
Adjust the clearance between the needle and chain
stitch needle guard F fi) to 0.3 - 0.5 mm.
Top of throat plate
Point of statíonary
knife
LeveI f®
Screw·
CD
About
0.5 mm
(1) Adjusting the height ofthe stationary knife CD until the
point of the stationary knife is flush with the top of the
throat plate.
*In case of angle knife, please unfasten screw and adjust
®portion to be about 0.5 mm in length.
(2) Adjust the height ofmovable knife
«P so that, when the
rnovable knife is lowered to íts lowest positíon, it will
engagestationary knife
CD 0.5 - 1 mm deep. Alsoalign
the stationary knife comer
withthe end face of the movo
ableknife.
0- 0.01 mm
I) Stationary
knife Movable knife
Stationary
knife
(O)
(x) (x)
(3) Adjust the stationary knife angle in thefollowing order.
(a) Loosenset
screw. and screw (B.
(b) Tum stationary knife holder support i) about screw (B untilthere ís a clearanceof about 0-0.01 mm in the for-
ward direction.
(c) Retighten set screw• and screw(B securely.
- 11 -

,; .
. ~.' .".
. .... : --: ~ ..
....
-. ~ .. ." ."
Caution:
The above-mentioned adjustment is not necessary because your machine has already been adjusted on the assembly line.
If a readjustment should become necessary, exercise great care not to damage the knives due to excessiveengagement of the
upper and lower knives.
15]. Feed dogs adjustment
(1) Loosen screw ~, and raise ar lower differentiaI feed dog
(front)
4D to the correct height.
Loosen screw
fj and adjust main feed dog (back) 4D .
0.3 - 0.5 mm
'--4D
L-----41f)
(In case of chaining-offhardly come out.)
(2) Tum the pulley until the feed dogs are raised to thehighest position, and adjust them to the following height above
the top of the throat plate.
{
1.0mm for light materiaIs.
1.3 mm for medium-heavy materiais.
1.5 mm for heavy materiaIs.
(3) Install chaining-off feed dog
~ at the sarneheight as main feed dog (back) 4D .
If free chain stitches hardly come out, lower it as shown in aboveright.
.INSTALLATION. AND ADJUSTMENT
oOF ATTACHMENTS ' ,'o •
m. Taping
o
8
8-
About I mm$
(1) Replace the presserfoot assemb1y with presser foot for tapingO,
(2) Install tape guide8 on face p1atecover@). (3) Sewn stitches will be as shown at above.
(Sew tape on only in case of serging.)
Caution:
Se1ect a bight so the right edge of tape
will
not be cut by the knives.
Otherwise, tape rnay not be sewn on in
a satisfactory way.
- 12 -

~". ":--~
;. tItI[B
Trouble
Cause
Remedy
r-
Wrong threading
r--
See paragraph on threading. 5
f--
Excessíve tension disc pressure. I---
Adjust to pro per pressure. 7
I--
Poor-quality thread. I---
Use thread of good quality, 5
Thread is toa thick for needle eye. Use needle
of correct size or thread
5
f--
e--.
of correct count.
Thread break
f-
f-
Needle setting incorrect1y.
e--
See paragraph on needle installing. 5
I--
Needle groove and needle eye
I---
Replace with good needle,
finished poor1y. 5
Needle,
loopers and thread take-ups See paragraphs on
adjustment of left
9
I--
not positioned properly to one
I---
hand looper vs. needle bar and thread
another. tension. 6
'--
Needle, loopers, throat plate,
I---
Smooth with oil stone or buff.
1/
thread passage have flaws,
r--
Wrong threading.
I---
See paragraph on threading. 5
f-
Excessive tension disc pressure.
I---
Adjust to proper pressure. 7
I--
Needle setting incorrect1y.
~
See paragraph on setting needle. 5
Stitchesskip
I-- ~
Needle point blunt or bent.
~
Replace with new needle. 5
Needle, loopers and
thread take-ups See paragraphs on adjustrnent
of left
9
f-
not positioned properly to one an-
I---
hand looper vs, needle bar and thread 6
other, or have incorrect clearance. tension. .
r-- Needle
and needle guard not posi-
I---
See paragraph on adjustment of left
9
tioned properly to one another. hand
looper vs, needle bar.
'---
Looper point hangs down,
I---
Correct with oil stone, or replace
1/
with new looper.
- 13-

Needle break
Poor trimming performance
Sharpen stationary knife; see paragraph
on bight
adjustrnent.
See paragraph on feed dog adjustrnent.
See paragraph on knives
adjustrnent .
See paragraph on
adjustrnent of double-
chain
stitch needle thread guide .
Adjusl lo
correct tensions ,
See paragraph on
adjustrnent of double-
chain
stitch thread take-up and lhread
guide.
Adjust lo correct
lhread tension .
See paragraph on
thread lension .
See paragraph on feed dog adjustrnent.
Smooth with sandpaper and polish
with buff.
See paragraph on lhreading.
Replace
with new needle.
See paragraph on
threading .
See paragraph on
adjustrnent of left
hand looper vs, needle bar.
See paragraphs on
adjustrnent of left
hand looper vs, needle bar and
adjustrnent of right hand looper.
See paragraph on
setting needle.
Wrong
timing of double-chain
stitch thread lake-up assembly.
Movable and
stationary knives
installed
incorrectly .
Needle and needle guard positioned
improperly to one another.
Movable knife and stationary knife
worn.
Needle thread guide positioned
incorrectly .
Main and
düferential feed dogs
are
not levei with one another.
Loopers, thread take-ups, and thread
guide not positioned properly lo one
another.
Main and differential feed dogs nol
uniform in height,
Excessive
thread tension.
Needle and loopers positioned
irnproperly to one another.
Throal plate's chain off finge r has
flaws.
Tensions of needle and looper threads
are 100 grea Ior 100 small .
Needle installed
incorrectly.
Troubl.
i
.
Doesn't work well without cloth.
(Overedge sewingl
Doesn't work well without cloth.
(Double-chain stitch sewingl
.'
- 14-

;..
•»Ó
r--
Needle point blunt,
f---
Replace with new needle. 5
INeedle makes
too large
~
holes in cloth HReplace
with smaller needle.
YNeedle too big for c1oth. 5
Wrong threading. HSee paragraph on threading. 5
'--
Thread is toa big for needle eye, -Replace with correct needle or thread.
5
Improper Úlread nipping f--
H Tension discs don't work right .
Remove dust from between tension
/
discs to let them work smoothly.
Needle, loopers and thread take- See
paragraphs on adjustment of lef! 9
~
ups positioned improperly to one
hand looper vs. needle bar and thread
6
another.
tension.
r-- Wrong threading.
f---
See paragraph on threading. 5
t--
Thread not uniforrn in thickness.
f---
Use thread of good qualítv. 5
H Thread passage defective.
f---
Smooth thread passage. V
Irregular stitehes
t--
-1 Thread take-ups and thread guides
not positioned properly to one See
paragraph on thread tension. 6
another.
-1
Movable and stationary knives rSee
paragraph on bight adjustment
8
don't cut well.
(Caution).
Stationary knife installed See
paragraph on knives adjustment .11
incorrectly.
- 15-
I,

Page
.----
Needle too big.
f--
Select needle suitable to cloth and 5
threads.
-Differential feed
not adjusted right. f--
See paragraph on stitch length and 8
differential feed adjustment.
1Presser foot pressure incorrect.Adjust pressure correctly. 7
Excessive wrinkJes by sewing
~
f--
Excessive thread tension.
f---
Adjust to correct pressure, 7
f-
Movable and stationary knives don 't
f--
See paragraph on bight adjustrnent 8
cut well. (Caution).
-Trimming
width and throat plate's
f--
Adjust trimming width to throat plate, 8
chain
off finger not balanced.or replace
throat piate.
See paragraphs on presser foot pressure 7
'--
Feed dogs installed incorrectly,
f---
adjustment and feed adjustrnent. 12
- 16-

. '.
SINCER'
812U
192580-2-02
•A TRADE MARK DF THE SINGER CDMPANY Printed in Japan