Singer 72W19 User manual

Form 1825w
Rev. (548)
INSTRUCTIONS
FOR USING
SINGER
SEWING MACHINE
72wl9
HEMSTITCH
4
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THE SINGER MANUFACTURING COMPANY
Printed in U. S. A.
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From the library of: Superior Sewing Machine & Supply LLC

USE SINGER" OILS
and LUBRICANTS
They insure freedom from lubricofing trouble and give
longer life to sev/ing equipment
The followir)g are the correct lubricants for this machine:
type B — MANUFACTURING 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 a 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.
GEAR LUBRICANT
This specially prepored grease is recommended for gear
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 tobies,
etc. Furnished In 1 lb. and 4 lb. tins.
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1825w
INSTRUCTIONS
FOR USING
SINGER
SEWING MACHINE
Machine 72wl9
No. 72wl9
HEMSTITCH
*A TRADE MARK OF
THE SINGER MANUFACTURING COMPANY
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TO ALL WHOM IT A\AY CONCERN:
The improper placing or renewal of the Trade Mark "SINGER" or
any other of the Trade Marks of The Singer Manufacturing Company
(all of which ore duly Registered Trade Marks) on any machine that
hasbeen repaired, rebuilt, reconditioned, or altered in any way whatsoever
outside a SINGER factory or an authorized SINGER agency isforbidden.
THE IMPORTANCE OF
USING SINGER* PARTS AND NEEDLES
IN SINGER MACHINES
The successful operation of SINGER machines can only be assured
if SINGER parts and needles are used. Supplies are available at all
SINGER Shops forthe Manufacturing Trade, and mail orders will receive
prompt attention.
SINGER Needles should be used
in SINGER Machines.
These Needles and iheir Containers
are marked with the
Company's Trade Mark "SIMANCO."" i
Needles in Containers marked
"FOR SINGER AAACHINES"
are NOT SINGER made needles. 2
Cop/righf,
U. S. A., 1922,1923,1925,1931 and 1933by
The Singer Manufacturing Company
All
RighU Reserved for All Countries
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DESCRIPTION
Hemstitch Machine 72wl9 is known as of straight-away feed
construction and has piercers and double needle actuating
device.
The stitch is known as the overedge hemstitch, having each
side of the opening overseamed. The piercer divides the cross
threads and the stitches collect and hold them in the form of bars
or spokes, leaving the clear openings in hemstitch work for which
this machine is famous.
Machine 72wl9 is fitted for straight-away two needle hem
stitch work, having ^ inch openings. It has an independent
piercer driving mechanism, and a detachable auxiliary piercer,
the function of which is to perforate closelywoven, stiff or heavy
material in advance of the needles, which work more freely and
with less spring in such material than when the auxiliary is not
used. While the auxiliary piercer is often used in the production
of "imitation drawn work," it is not required for material previ
ously drawn. For ornamental stitching on Shirt Waists, Neckties,
Underwear, etc.
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The number before the hyphen or letter designates the Class
to which the machine belongs, and the number after, the Variety
of the machine in its Class.
When supplies for a machine are to be ordered and there
is any uncertainty as to the correct numbers of needles or parts,
the Class and Variety numbers of the machine, as shown on the
number plate, should be given to ensure a correct understanding
of the order.
THREAD
Fine thread should always be used. We recommend Nos.
120 to 150 in cotton thread.
SPEED
The maximum speed recommended for Machine No. 72wl9 is
1300 stitches per minute. Run the machine somewhat slower
than this at first and after the parts have become thoroughly
glazed by their action, increase the speed to the maximum stated.
NEEDLES
Needles for Machine No. 72wl9 are of Class and Variety
130x3 (usually of sizes 10, 12'and 14).
The needle which is best adapted for the work that the
machineis fitted to do is set in the machine at the factory.
The size number of the needle is marked upon its shank.
The Sizes. The size to be used should be determined by
the size of the thread
which must pass freely through the eye.
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 seriously interfered with.
Orders for needles must specify the quantity required, the
size, alsothe classand variety numbers, separated by x.
The following are details of an intelligible order:
'TOO No. 12—130x3 Needles."
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Fig. 2. Machine 72wl9. Phantom view, showing places to oil
and reference letters.
a—Thumb Nuts, adjustable for
width of needle vibration,
b—Needle Vibrating Cam and Gear
Segment Lever Connections,
c—Arm Shaft Connections,
d—Arm Shaft.
e—Needle Vibrating Cam and Gear
48 teeth,
f—Arm Shaft Bushing (back),
g—Needle Vibrating Cam and Gear
Stud.
h—Arm Plate (not shown).
1—Needle Vibrating Cam and Gear
Driving Gear. 16 teeth,
ik—Piercer Driving Eccentric, ad
justable for an earlier or lat
er puncture by the piercer.
J—Needle Vibrating Cam and Gear
Segment Lever Connection
Links,
k—Arm Shaft Bushing (front).
1—Take-up Cam.
o—Needle Bar.
p—Needle Bar Connecting Stud,
adjustable for height of
needle bar.
r—Presser Bar Spring,
u—Feed Driving Rock ShaftCrank.
V—Feed Lifting Cam.
w—Feed Driving Rock Shaft.
X—Hook Counter Shaft,
y—Hook Bevel Pinion (left), 24
teeth.
yy—Hook Bevel Pinion (right), 24
teeth.
aa—Hook Saddle (right),
aaa—Hook Saddle (left),
bb—Hook Saddle Screw,
cc—Feed Driving Cam and Gear
Shaft Bracket,
dd—Feed Lifting Rock Shaft and
Crank, adjustable for height
of feed dog.
ee—Feed Bar.
ff—Hook Driving Shaft,
gg—Hook Counter Shaft Driving
Gear, 44 teeth,
hh—Hook Counter Shaft Gear, 22
teeth.
ii—Feed Driving Cam and Gear
Driving Gear, 18 teeth,
jj—Feed Driving Cam and Gear,
54 teeth.
kk—Feed Driving Segment Lever
Crank.
11—Feed Driving Segment Lever,
mm—Feed Driving Rock Shaft Con
nection.
nn—Feed Driving Segment Lever
Clamp.
00—Hook Driving Shaft Bearing,
pp—Feed Regulating Handle,
qq—Feed Regulating Handle Shaft
Crank Link,
rr—Feed Regulating Handle Shaft
Crank.
XX—Hook Bevel Gear Socket (right),
24 teeth.
XXX—Hook Bevel Gear Socket (left),
24 teeth.
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6
TO OIL THE MACHINE
Use "TYPE B" or "TYPE D" OIL sold only by Singer
Sewing Machine Company. For description of oils, see inside of
front cover. Oil should be regularly used on any surface of metal
which comes in movable contact with another surface.
It is necessary for the easy running of the machine, that all
bearings be oiled. The hook especially should have the attention
of the operator, as a drop of oil occasionally on the bobbin case
base flange prevents excessive friction in the hook race and
assists in making the opening between the stop on the bobbin
case and that on the throat plate; thus, preventing the upper
thread from breaking.
TO SET THE NEEDLES
Turn the balance wheel toward you, to raise the needle bar
to its highest position; hold the needle with the flat side of the
shank toward the other needle (or center), push it up in the
needle holder as far as it can go and tighten the pinch screw.
Care must be taken to set the needles so that they will swing
freely, with their points completely housed, into the grooves of
the piercer on the inside vibration, to assure clear openings.
-tii
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Fig. 3. Machine No. 72 w 19
TO THREAD THE NEEDLES
Lead the thread from the back spool through the lower hole
in the post thread guide, through the eye of the thread guide
(back), under the thread retainer guide wire, between the thread
retainer and tension discs (back), down under inside thread
controller, up through the upper hole in the take-up lever, down
through the inside guides to the inside needle, and thread the
inside needle from left to right.
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Lead the thread from the front spool through the upper hole
in the post thread guide, through the eye of the thread guide
(front), under the thread retainer guide wire, between the thread
retainer and tension discs (front), down under outside thread
controller, up through the lower hole in the take-up lever, down
through the outside guides to the outside needle, and thread the
outside needle from right to left.
Hook and Bobbin Case
TO REMOVE THE BOBBIN
Draw back the slides on the bed to uncover the hooks; turn
the balance wheel toward you until the notch in the side of the
bobbin case cap is accessible; lift out the bobbin case cap by
placing your thumb nail in the notch and remove the bobbin.
Fig. 5
Bobbin—Bobbin Case Cap
Fig. 6
Bobbin Case Cap
Threaded
? a {
\ 0 S
Fig. 7
Bobbin Case Cap Parts
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TO THREAD THE BOBBIN CASE CAP
Hold the cap in the left hand, place the bobbin with the
thread drawing from the direction shown (see Figs. 5 and 6);
then draw the thread under tension spring (a) and through slot
(b) back under tension spring (a), through slot (c) and out under
thread guide (e) thus threading the cap. After threading, place
the cap on the bobbin case base in the machine and push down
the latch.
The bobbin case tension is regulated by the screw which
passes through the centerof the tension springon the bobbin case.
TO WIND THE BOBBIN
(See Fig. 8)
On machines fitted with loose pulley, turn the thumb screw
(C, Fig. 8), at the right of the balance wheel, over toward you to
release the balance wheel. It will be necessary to hold tl\e
balance wheel while loosening the thumb screw.
Fasten the bobbin winder to the table with its driving pulley
in front of the machine belt so that the pulley will dropawayfrom
the belt when .sufficient thread has been wound upon the bobbin.
Fig. 8. Winding the Bobbin
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10
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
tension bracket, around 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 outwardly.
After the bobbin has been wound, turn the thumb screw
(C, Fig. 8) over from you to tighten the balance wheel.
KNEE LIFTER
The knee lifter is used for raising the presser foot by knee
pressure against the knee plate, leaving both hands free to manip
ulate the work. If the knee lifter does not raise the presser foot
satisfactorily, adjust the rod in the rock lever which connects
with the rod in the arm of the machine to lift the presser foot.
STITCH FORMATION AND PIERCER ACTION
How the Straight-away Hemstitch Opening is Made
One double stitch is made on the inside vibration, another on
the outside vibration and the third on the inside vibration of the
needles. The piercer rises out of the material at every stitch.
First Stitch. On the inside vibration, the piercer, followed by
the needles with their points housed in its grooves, enters to its
widest part and spreads the material just after the feed dog has
dropped below the surface of the throat plate; as the needles rise
they spread a little for the hooks to catch the thread loops.
Second Stitch. On the outside vibration the needles descend
spread apart, each needle entering the material outside of and the
piercer within the opening, to make the stitches which draw and
hold the
bar (or spoke) stitches up to the material in imitation of
hand work.
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u
Third Stitch. On the inside vibration, the piercer, followed
by the needles with their points housed in its grooves, descends
again into
the opening for the third stitch. After the piercer and
needles rise sufficiently clear of the material the feed dog rises and
moves the material forward for the needles to work the first stitch
in the next opening, binding the intervening threads of the
material into a bar (or spoke). Each set of three stitches for
each opening is formed in the same manner.
The piercer usually set in the machine at the factory is No.
213826. Piercer No. 213825 is finer, for extra fine work, silks,
etc.
The auxiliary piercer is No. 234739.
PIERCERS AND AUXILIARY PIERCERS
USED IN MACHINE 72w19
ALSO DIAGRAMS SHOWING SHAPES
213825 213826 234739 213828 213830 234737 234738
E6I41
Fig. 9
The above diagrams show exact sizes and shapes of punctures.
TO COMMENCE SEWING
With the left hand take hold of the needle threads, leaving
them slack between the hand and the needles, turn the balance
wheel toward you until the needles move down and up again
to their highest position, thus catching the under threads, draw
up the needle threads and the under threads with them through
the slots in the throat plate and lay the four threads back under
neath the presser foot; then place the material beneath the
needles, lower the presser foot upon it, turn the balance wheel
toward you, and commence to sew.
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12
THE TENSIONS
Both upper tensions are regulated by the thumb nuts in
front of the tension discs.
Both upper and bobbin case tensions should be as light as
possible
consistent with a perfect stitch.
To release the tension without disturbing the presser foot
or work, push lever (A, see Fig. 3) from you.
Caution. Do not try to adjust the tensions when the presser
foot is up. For convenience in removing the work, the tension
of the upper threads is released whenever the presser foot is
raised by the lifter, but is not released by the rising of the presser
foot as goods or seams pass under it.
LENGTH OF STITCH
The length of stitch should be governed by the kind of
material to be hemstitched; a stitch that is too short will not
leave asufficient number of threads between the openings in
fine material to insure against their breaking.
Correctly formed stitches require careful adjustment of the
needle vibration in relation to the length of stitch and width of
bight; much however depends upon the texture of the fabric to
be
hemstitched, and necessary adjustments should be made at
each change of fabric.
TO TURN A SQUARE CORNER
After the piercer has entered the material for what is to be
the last opening in a straight line, and before the needles are
down, turn the material at right angles to the last line of openings
and proceed to stitch as before. There will be no extra hole
punctured at the corner by the auxiliary piercer.
TO REMOVE THE WORK
Have the take-up lever at its highest point; raise the presser
foot, draw the work back to the left and cut the threads close to
the goods.
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INSTRUCTIONS
FOR
ADJUSTERS AND MACHINISTS
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INSTRUCTIONS
FOR
ADJUSTERS AND MACHINISTS
THREAD CONTROLLER
See Fig. 3
The function of the thread controller spring is to hold back
the slack of the upper threads until the eyes of the needles reach
the goods in their descent.
For a longer action of the double thread controllers, loosen
screw (B) and set stop (C) lower. For less action of the thread
controllers, reverse the operation.
To strengthen the action of the inside thread controller (D),
loosen screw (E) and turn nut (F) to the right and tighten the
screw.
To strengthen the action of the outside thread controller
(G), loosen the set screw in thumb nut (H) and turn thumb nut
(H) to the right, then tighten the set screw. For lighter action
reverse the operations.
TO CHANGE THE LENGTH OF STITCH
The clamp screw (nn, see Fig. 2) is tightened so that an
operator cannot change the number of stitches to the inch for
which the machine is set; but if a change of stitch is desired,
loosen screw (nn) and tighten it after moving handle (pp) for
the desired length of stitch. If handle (pp) moves too easily,
tighten the screw at the left of and closeto the handle.
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16
TO ADJUST THE FEED DOG
The feed dog should rise and show a full tooth above the
throat plate as the eyes of the needles come up level with the
plateafter forming the third stitch in the opening. The feed dog
should not begin to move forward for the next opening until the
needle points are clear of the goods.
The feed dog must be kept level so as to afford the best
condition for handling the material. To level the feed dog use
adjusting screw at (ee, see Fig. 2) and secure by check nut.
TO RAISE OR LOWER THE FEED DOG
See Fig. 2
Clean the lint and dirt from it; tip back the machine and
turn the balance wheel toward you until the feed is at its highest
position; loosenthe screw of crank (dd) and move it up or down
until the feed is at the desired height and tighten the screw in
crank (dd).
The feed dog does not require adjusting except for some
unusual kind of work or if badl}*^ worn.
FEED ADJUSTMENTS
See Fig. 2
The feed adjustments which follow are seldom required,
but, if an adjustment becomes necessary, take care that the
position of the other parts is not changed.
To cause the feed to start earlier after the feed dog is up
and the needles are clear of the goods, carefully loosen the screws
in feed driving gear (ii) and slightly turn the top of the feeddriv
ing gear toward you, which sets cam and gear (jj) forward, be
careful not to make too great a change, then tighten the screws
firmly. If the feed does not start as earlyas required, repeat the
operation. To make the feed start later move the top of feed
driving gear (ii) slightly from you. Any change made in the
time of cam and gear (jj) may necessitate a change of the posi
tion of feed lifting cam (V).
For an earlier drop of the feed dog, move or set the top of
cam (V) from you, and fora later drop of the feed dog, move or
set it toward you.
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17
NEEDLES—ADJUSTMENT OF BIGHT OR VIBRATION
See Figs. 2 and 3
The spreading and drawing in or vibratory action of the
needles is caused by needle vibrating cam and gear (e) driven by
driving gear (i), connected by lever connections (L) and levers
(J) to the needle holders (K).
On the outside vibration, the lever connections (L) draw
levers (J) toward each other and spread them on the inside
vibration, by their connection with needle holders (K).
On the descending inside vibration of the needles, their eyes
should be on a level with the material before they commence to
move
outward toward the hooks, which will bring the strain of
the expanding needles upon their shanks when they have reached
the lowest portion of the stroke of the needle bar.
To Change the Vibration of Either Needle. For a narrow
vibration adjust thumb nut (a) toward the center and for a wider
vibration adjust it from the center of the vibrator lever.
Should the points of the needles as they descend upon the
inside vibration appear outside of the grooves of the piercer, a
very fine
adjustment may be made by turning needle vibrating
lever
(J, see Figs. 17 and 18, screws Q) slightly to the left or right
to swing needle holder (K) in the direction required; thus keep
ing the needles properly housed during their descent.
As
the needle lever pitmans are independently mounted,
they must be separately adjusted.
Lengthening the lower pitman makes the inside needle
vibrate farther over the edge of the material, to the right, and
shortening the upper pitman makes the outside needle vibrate
farther over the edge of the material, to the left.
To obtain the best results and a uniform action of the needles,
great care must be taken to set thumb nut (a, see Fig. 2) of each
pitman an equal distance from the center of the needle vibrator
lever. Should the pitman require lengthening or shortening to
obtain a correct position of the needle, loosen screws (j) and move
the pitman to the desired position, then retighten the screws. If
these adjustments do not suffice, the time of cam and gear (e),
on the arm shaft may be changed by loosening the set screws in
pinion (i) and turning it slightly for an earlier or later vibration
of the needles.
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Either needle can be set closer to or farther from the other
(see Figs. 16 and 17) by loosening nuts (OO) and adjusting
hinge screws (R).
Great care must be taken when making any change of time,
not to make the change too great or carelessly. See that all of
the screws are tightened firmly before starting the machine.
NEEDLE BAR
To Set the Needle Bar. Two lines inch apart are marked
across the bar about IJ inch from its lower end; when the needle
bar is at its lowest position set it so that the highest mark is
even with the underside of the needle bar bushing.
To Set a Needle Bar Which Has no Mark. Set the needle
bar so that when it rises inch from its lowest position, the
point of the hook will be at the center of the needle and about
iV inch above the eye; by looking across the top of the bobbin
case down to the eye, the full length of the eye should be seen
below and close up to the point of the hook.
O
Fig. 11
Hook Washer
Transparent view of saddle,
with hook, gear socket, and
screw (200555), passing down
through the hook into the gear
socket, binding them together.
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HOOK (SEWING) ADJUSTMENTS
To See if the Hooks are in Correct Time. Remove the slides
and throat plate and turn the balance wheel toward you until
the needle bar has passed its lowest position and risen so that
the lower mark on it is even with the underside of the needle bar
bushing. If in correct time, the point of each hook will be at the
center of each needle and inch above the eye; if not, loosen the
screws in the bevel gear on the shaft under the hook and turn
the gear forward or backward slightly until the hook is in time
as instructed above, then retighten the screws.
Be sure that the needle guard on the hook washer (see Fig.
11) does not deflect the needle. If the hook is too far from or
too near the needle, loosen hook saddle screws (bb, see Fig. 2)
just enough to permit the saddle to be driven with light blows
to the position desired, then retighten the screws.
Fig. 12
Bobbin Case Washer (Cloth)
200555
201253
Fig. 13
Hook Gib, Hook Gib Screw, Hook Gib
Hinge Screw and Hook
Socket Screw
Fig. 14
Bobbin Case Base
Fig. 15
Hook (Sewing) with Gib and Screws
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