Singer 143G2 User manual

iNSTRUCTIONS
FOR USING AND ADJUSTING
SINGER
SEWING MACHINES
I43G2 and I43G3
ZIGZAG LOCK STITCH
THE SINGER
COMPANY
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USE SINGER* OILS
and LUBRICANTS
They insure freedom from lubricating trouble and give
longer life to sewing equipment
The following are the correct lubricants for this machine:
TYPE B — MANUFAaURlNG MACHINE OIL, HEAVY GRADE
When an oil is desired which will produce a minimum of
stain on fabrics, even after a long period of storage, use:
TYPE D — MANUFACTURING MACHINE OIL, HEAVY GRADE
OTHER SINGER* LUBRICANTS
type E — THREAD LUBRICANT
For lubricating the needle thread of sewing machines for
stitching fabrics or leather where o thread lubricant Is
required.
TYPE F - MOTOR OIL
For oil lubricated motors and plain bearings in power
tables and transmitters.
NOTE: All of the above oils are available in 1 quart,
1gallon and 5gallon cans.
©EAR LUBRICANT
This specially prepared grease is recommended for geor
lubrication on manufacturing sewing machines.
BALL BEARING LUBRICANT
This pure grease is specially designed for the lubrication
of ball bearings and ball thrust bearings of motors and
electric transmitters, ball bearing hangers of power tables,
etc. Furnished in 1 lb. and 4 lb. tins.
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Form 30272G
(1064)
INSTRUCTIONS
FOR USING AND ADJUSTING
SINGER
SEWINe MACHINES
I43G2 and 14303
THE SINGER COMPANY
*A Trademark of THE SINGER COMPANY
Printed in Great Britain
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r
Copyright under International Copyright Union
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DESCRIPTION
HIGH SPEED MACHINE 143G2 has an aluminium alloy vibrating
needle bar frame and a rotary hook, and is intended for over-
seaming and zigzag stitching on fine lingerie, general fabrics
and light weight leather. It has ball bearings on the rear end
of the arm shaft and hook drying shaft. The needle has a maxi
mum throw of 3/16 inch, vibrating both sides of a centre line.
The speed of this machine is especially valuable in zigzag
work and long overseaming in fine fabrics such as women's under
wear, slips, also reducing corsets, dresses, etc. It is success
fully used in general tailoring work and the manufacture of
articles such as trousers, coats, gloves, and for certain opera
tions in the manufacture of shoes, such as attaching side and top
facings to the linings and butting canvas or felt toe pieces to
the end of the vamp.
In the manufacture of table covers, draperies, scarfs, etc.,
an ornamental effect can be produced by overseaming a cord with
thread of a contrasting colour. The raw edges of fabric may be
overseamed by taking one stitch in the fabric and the other over
the edge.
MACHINE 143G3 is similar to Machine 143G2 except that the
needle has a maximum throw of 5/16 inch. It is designed for
basting and tacking coat pads.
Speed
The maiimuiD speed recommended for either machine Is 3000
stitches per minute, the speeds dep^dlng on the material being
sevc. The machines should be run slower than the maximum speed
at first until the parts which are In moving contact have become
glazed by their action on each other. When the machine Is In
operation, the machine pulley should turn over toward the oper
ator.
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To Oil the Machine
Use "TTPE B" or "TTPE D* OIL, sold Oy Singer Sewing Machine
Company. Fbr description of these oils, see Inside front cover
of this book..
The machine should be oiled at the places designated by un
lettered arrows In Figs. 2 to 6, and when in continuous use It
should be oiled at least twice a day.
Fig. 2. Front View of Machine, Showing Oiling Points
Slip the belt off the machine pulley, tum the machine back
on Its hinges and apply oil to the points shown in Fig. 6, then
bring the machine forward Into place.
Fig. 3. oiling Points and Adjustments at Rear of Machine
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Remove the face plate and apply oil to the places indicated
In Fig. 4, then replace the face plate.
Fig. 4. Face Plate Removed, Showing Oiling Points
Turn back the cap at the top of the machine, and apply oil to
the places shown In Fig. 5.
Fig. 5. Oiling Points and Adjustments at Top of Machine
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Fig. 6. Oiling Points and Adjustments Underneath the Machine
Oil the bobbin case bearing In the hook race each time a
bobbin is replaced.
Needles
Needles for Machines 143G2 and 143G3 are Catalogue 1901
(l35x7), made In sizes 7,8,9,10,12,14,16,18,20,22 and 24.
The size of the needle to be used should be determined by the
size of the thread which roust pass freely through the eye of the
needle. If rough or uneven thread is used, or If It passes with
difficulty through the eye of the needle, the successful use of
the machine will be Interfered-with.
Orders for needles must specify the QUAWTITY required, the
Si;2! and also the Catalogue number.
The follovflng is an example of an intelligible orderi
"100 size U, Catalogue 1901 Needles".
Best results will be obtained with needles sold by Singer
Sewing Machine Company.
Relative Sizes of Needles and Thread
Size Numbers
of Needles
For Cloth Work
Cotton Silk
12
70 to 100 00 to A
14 50 to 70
A, B
16 40 to SO B, C
18 30 to 40
C, D
20 24 to 30 D, E
To make a
smooth, even stitch with your sewing machine, use
good, firmly twisted and smoothly finished thread, that passes
freely through the eye of the needle.
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In using slack twist or uneven silk,should It be frayed or
roughened, see whether the needle Is too fine or too sharp, or
has ahooked point, made by striking the throat plate.
For ordinary work use the same size of thread on the bobbin
as In the needle. Always use soft finished thread on the bobbin.
Thread
Left twist thread should be used In the needle,
or left twist thread can be used In the bobbin.
Either right
Fig. 7. How to Determine the Twist
Hold the thread as shown above. Turn the thread over toward
you between the thumb and the forefinger of the right hand; If
left twist, the strands will wind tighter; If right twist, the
strands will unwind. Use soft finish thread of the same size for
the needle and the bobbin.
Fig. 8. Removing the Bobbin case
To Remove the Bobbin Case
Lift the bobbin case latch, as shown In Fig. 8, and draw the
bobbin case out from you, turn Its open end down and release the
latch and the bobbin will drop out.
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V
8
To Wind the Bobbin
(See Fig. 9)
Fasten the bobbin winder to the table with its driving pulley
in front of the machine belt so that the pulley will drop away
from the belt when sufficient thread has been wound upon the
bobbin.
Fig. 9. Winding the Bobbin
Place the bobbin on the bobbin winder spindle and push it on
as far as it will go.
Pass the thread down through the thread guide (1) in the ten
sion bracket, aromd the back and between the tension discs (2).
Then wind the end of the thread around the bobbin a few times,
push the bobbin winder pulley over against the machine belt and
start the machine.
When sufficient thread has been wound upon the bobbin, the
bobbin winder will stop automatically.
If the thread does not wind evenly on the bobbin, loosen the
screw (a) in the tension bracket and move the bracket to the
right or left as may be required, then tighten the screw.
The amount of thread wound on the bobbin is regulated by the
screw (B). To wind more thread on the bobbin, turn the screw (B)
inwardly. To wind less thread on the bobbin, turn the screw out
wardly.
Bobbins can be wound while the machine is stitching.
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To Thread the Bobbin Case
Fig. 10
With the left hand, hold the
bobbin case as shown In Fig. 10,
the tension spring being at the
front, and place the bobbin into
the bobbin case.
rsToo
Fig. 12
Hold the bobbin between the
thumb and forefinger of the
right hand, the thread drawing
on the top from the left toward
the right, as shown In Fig. 10.
LdbECJ
Fig. 11
Then pull the thread Into
the Blot In the edge of the
bobbin case as shown in Fig.
11, and back under the ten
sion spring Into the slot at
the end of the tension spring,
as shown In Fig. 12.
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10
To Replace the Bobbin Case
After threading, take the bobbin case by the latch, holding
It between the thumb and forefinger of the left hand; place the
bobbin case on the centre stud of the bobbin case base, release
the latch and press the bobbin case back until the latch catches
the groove near the end of the stud. Allow the thread to hang
free and replace the slide In thSig^ed of the machine.
To Set the Needle
P\i6h the needle up In the needle bar as far as It will go,
with the long groove to the front, and secure It firmly with the
set screw.
It may be necessary to turn the needle slightly to the right
or left for some threads If stitches are missed.
Operators are liable to use needles which are too fine.
Better results usually follow the use of a needle of a larger
size.
Threading the Needle
(See Fig. 13)
Turn the machine pulley until the thread take-up (10) is at
Its highest position.
Pass the thread from the unwinder, from back to front through
the lower hole (1) In the pin on top of the machine, from right
to left through the upper hole (2) in the pin, downward through
the hole (3), upward through the middle hole (4) and downward
through the hole (5) of the thread stralghtener, down and to the
left between the tension discs (6), and against the pressure of
the controller spring Into the fork at (7), to the right of the
wire guard (8), up through the thread guide (9), from right to
left through the thread take-up eyelet (10), down again through
the guide (9), against the auxiliary thread take-up and back of
the guide (11), Into guide (12), down through the hole (13) at
the lower end of the needle bar, and from front to back through
the eye of the needle (U). Draw about two Inches of thread
through the eye of the needle with vdilch to commence sewing.
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11
al-
^%
Fig. 13. Threading the Needle
To Prepare for Sewing
With the left hand hold the end of the needle thread, leav
ing it slack, from the hand to the needle, turn the machine pul
ley over toward you until the needle moves dovai and up again to
its highest point, thus catching the bobbin thread; draw up the
needle thread and the bobbin thread will come up with it through
the hole in the throat plate. Lay both threads back under the
presser foot.
To Comnfjence Sewing
Place the material breath the presser foot, lower the press
er foot and commence to sew, turning the machine pulley over to
ward you.
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12
To Turn a Corner
Stop the raachlne while the needle Is rising, hut before It Is
out of the material, raise the presser foot and turn the work,
using the needle as a pivot.
To Remove Work
Raise the presser lifter, turn the machine by the machine
pulley until the take-up lever is at its highest point and draw
the work from you. If the threads do not draw out easily, the
tatce-up ±ever is not In the right position, as directed, if tne
machine Is stopped as directed, the needle will not be unthreaded
In starting to sew, even If only a short end Is left through the
needle.
For convenience In taking out the work, the tension of the
upper thread Is released by raising the presser foot with the
lifter; but Is not released by thick goods or seams passing under
the presser foot. Do not try to adjust the upper tension when
the presser lifter is up as the tension Is then loose.
Causes of the raachlne not working properly will usually be
found In the tension not being correctly adjusted, or Its discs
raay be clogged with lint or knots of thread or the thread con
troller spring may not have the correct tension (this Is Impor
tant); the thread may be too coarse or too fine for the needle,
or the needle and thread too coarse or too fine for the throat
plate, or the needle bent or blimt. See that a straight needle
Is pushed up In the needle bar as far as It should go; any
particle of lint or dirt vrtiich prevents It from going up can be
removed through the cross hole in the needle bar.
To Regulate the Pressure on the Material
The pressure of the presser foot on the material should be
heavy enough so that the material Is fed properly at all speeds.
The pressure on the material is regulated by the thumb screw
{F,Flg.4) at the top of the raachlne. Loosen the set screw (Q,
Fig.4) at the back of the machine and turn the thumb screw down
ward for more pressure or urward for less pressure, then tighten
the set screw (Q,Flg.4).
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13
Tensions
The needle and bobbin threads should be locked In the centre
of the thickness of the material, thus:
iM
Fig. 14, Perfect Stitch
If the tension on the needle thread Is too tight, or If that
on the bobbin thread Is too loose, the needle thread will He
straight along the upper surface of the material, thus:
i
LaliJiAAAali
Fig. 15. Tight Needle Thread Tension
If the tension on the bobbin thread la too tight, or If that
on the needle thread Is too loose, the bobbin thread will He
straight along the imder side of the material thus:
DDODOD
Fig. 16. Loose Needle Thread Tension
To Regulate the Tensions
THE TENSICW ON THE NEEDLE THREAD SHOULD ONLY BE REGULATED
WHEN THE PRESSER FOOT IS DOVW, Having lowered the presser foot,
tin*n the thumb nut (S,Fig.18) at the front of the tension discs
over to the right to Increase the tension. To decrease the ten
sion, turn this thumb nut over to the left.
The tension on the bobbin thread is regulated by the screw
(A,Fig.10) In the tension spring on the outside of the bobbin
case. To Increase the tension, turn this screw over to the right.
To decrease the tension, turn this screw over to the left.
When the tension on the bobbin thread has been once properly
adjusted. It Is seldom necessary to change It, as a correct
stitch can usually be obtained by varying the tension on the
needle thread.
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14
To Regulate the Length of Stitch
Press Che stitch regulator lever (A, Fig. 17) and at the same
time turn the machine pulley over toward you until the lever (A)
Pig. 17. Stitch Regulator
engages the notch In the stitch regulator flange (B, Fig. 17).
Continue to hold the lever (A) In the notch In the flange (B)
and at the same time turn the machine pulley backward or for
ward, as required, until the number of the desired length of
stitch Is opposite the arrow, as shovm in Fig, tr, then release
the lever (A).
To Regulate the Width of Bight
The width of bight or zigzag stitch Is regulated by means of
the needle vibrator regulating spindle head (A,Fig.2) at the
front of the machine. To Increase the width of zigzag stitch
turn the regulating spindle head over to the left. To decrease
the width of zigzag stitch, turn the regulating spindle head over
to the right. The extreme width of zigzag stitch Is 3/16 Inch
for Machine 143G2, and 5/16 Inch for Machine 143G3.
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15
INSTRUCTIONS
FOR
ADJUSTERS AND MECHANICS
Thr^d Controller
The function of the thread controller spring (Q,Fig.18) is to
hold back the slack of the needle thread until the eye of the
needle nearly reaches the goods in Its descent, as without this
controlling action of the spring, the slack thread or silk (more
especially silk) will sometimes be penetrated by the point of the
needle as the needle Is descending.
Fig. 18.
For more controller action on the thread, loosen the stop
screw (u,Fig.18) and set the stop (R) lower. For less action,
set the stop higher. The position of the controller spring (Q)
shown In Fig. 18 is the best average setting for stitching fine
fabrics and light leathers.
To strengthen the action of the controller spring on the
thread, loosen the tension stud screw (V,Fig.18), and turn the
tension stud (T) slightly to the left with a screwdriver. To
lighten the spring action, turn the stud to the right, then
tighten the tension stud screw (V).
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16
To Set the Needle Bar
See that the needle Is up In the Par as far as It will rq.
There are two lines 3/32 inch apart across the needle bar
about two Inches above the lower end. When the needle bar Is at
Its lowest position, the UPPER MARK should be Just visible at the
lower end of the needle bar frame.
Fig. 19. Face Plate Removed
In case the needle bar Is not correctly set, loosen the
needle bar connecting stud set screw (HI,Fig,19) and move the
needle bar to the correct position, then tighten the set screw,
TO SET ANEEDLE BAR WHICH HAS NO MARK: Set the needle bar so
that when it rises 3/32 inch from Its lowest position, the eye of
the needle will be about 1/16 Inch below the point of the hook as
the hook point enters the thread loop.
To Set and Time the Needle Bar Frame
First turn the needle vibrator spindle head (A,Fig.2) all the
way to the right so that the needle will not vibrate when the ma
chine Is running. A straight needle should now come in the cen
tre of the needle hole In the throat plate. If It does not,
loosen the set screw which holds the eccentric stud (Kl,Flg.l9)
\nd turn the stud (KL) until It does, then tighten the set screw.
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Now turn Che needle vibrator regulating spindle head to the
left for the widest throw. Turn the machine pulley toward you
until the needle Is at Its lowest position. As the needle bar
starts to nse» the needle bar frame sluiuld start to move side-
wise. If It does not, advance or retard the vibrator gear pin
ion CM, Fig. 5).
To Remove the Needle Vibrator Gear Shaft
Remove the needle vibrator regulating spindle head (A,Fig.2)
and the eccentric bracket cover (C,Flg.2}; remove the locking and
adjusting screws (A1 and Bl,Flg,20), also the screw and spring
(El). Loosen the two set screws In the gear (Dl) and remove the
needle vibrator gear shaft collar (L,Flg.3) at the back of the
arm, then draw the shaft out.
When replacing these parts be careful that the large washer
(Cl,Flg.20) Is In place between the gear and arm, that the posi
tion screws are set firmly against the flat spots on the shaft
and that the set screws are at the right of the position screws
when the shaft has been returned to Its place.
TO SET THE NEEDI£ VIBRATOR REGUIATING SPINDLE HEAD SO
THAT A WIDER THROW THAN THE ONE DESIRED CANNOT BE MADE:
Fig. 20. Transparent View Showing the Needle Vibrator
Regulating Spindle Head In Front of Machine
Turn the spindle head (A,Fig.2) to make the widest bight
possible; remove locking screw (Al,Flg.20) and turn In screw (Bl)
until the stitch Is of the width desired; then turn screw (Al)
down tightly on screw (Bl) as a check. The width of stitch may
then be decreased by turning the regulating spindle head, but
operators cannot make stitches wider than the adjusting screw
(Bl) Is set to produce.
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18
To Time the Sewing Hook
Remove the throat plate and with needle vibration at zero,
turn the machine pulley over toward you until the LOWER timing
mark, on the needle bar is Just visible at the end of the needle
bar frame (or until the needle bar has risen 3/33 Inch); If the
needle and hook, are in correct time, the point of the hook will
be opposite the centre of the needle.
To time the hook, loosen the set screws In the lower belt
pulley {J,Flg.6) and turn the hook as required. Before tighten
ing the set screws, see that there Is no end play In the shaft.
CC
Fig. 21
To Set the Hook To or From the Needle
The point of the hook should come as close as possible to the
needle without touching It. Loosen the four screws (X and AA,
Fig.21) and slide the hook to the correct position, then tighten
the two screws (X). Reset the gear on the hook shaft and tighten
screws (AA).
To Remove the Hook
Remove the bobbin case stop (Y,Fig.21), loosen the hook
spindle screw (w) a few turns and tap It lightly to loosen the
hook. Then remove the screw (W) and withdraw the hook from Its
socket.
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