Singer 71K101 User manual

• INSTRUCTIONS
FOR USING AND ADJUSTING
SINGER
SEWING. MACHINE
71K101
FOR MAKING STRAIGHT BUTTONHOLES
WITH SQUARE BARRED ENDS
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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 ihe correct lubricants for this machine:
TYPE B — MANUFAaURING 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
1
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 ore available in 1 quart,
1gallon
and 5gallon cans.
GEAR LUBRICANT
This specially prepared grease Is recommended for gear
lubrication on manufacturing sewing machines.
BALL BEARING LUBRICANT
This pure 0'rease 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 K6441
(861)
INSTRUCTIONS
FOR USING AND ADJUSTING
SINGER
SEWING MACHINE
7IkI0I
HIGH SPEED
GEAR DRIVEN FEED
THE SINGER MANUFACTURING COMPANY
*A Trademark of THESINGER MANUFACTURING COMPANY
Printed in U.S.A.
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Copyright under international Copyright Union
From the library of: Superior Sewing Machine & Supply LLC

DESCRIPTION
Machine 71k101 is designed for making straight buttonholes
in cotton, linen, rayon and silk fabrics, knit goods,etc.
This machine has a positive, gear driven, intermittent feed
which controls the movement of the work clamp so that the
stitches are uniformly spaced around the buttonhole under all
conditions.
By simply changing the stitch regulating gear, the number
of stitches in the buttonhole can be varied, as desired. (See list
of stitch regfulating gears on page 16.)
The stop motion mechanism of this machine includes a pair
of gears having a ratio of 2 to 1 for reducing the speed of the
stop cam to one-half of the speed of the -sewing shaft. The stop
cam has two stop notches located diametrically opposite each
other so that when the stop motion mechanism is engaged, the
stop cam turns only a part of a revolution before the interlocking
rod drops into one of the notches to stop the machine. Asingle,
extra long spiral spring in the stop cam gear helps the machine
to stop without shock.
Machine 71k101 makes purl stitch buttonholes with square
barred ends, the hole being cut from f to f inch long. Both
threads and the buttonhole are cut after stitching. Buttonholes up
to 1 inch long can also be made on this machine by using Clamp
Check Complete 249758, Clamp Check Holder 271946, Fibre
Washer 40045 and a knife of the required length. These parts will
be furnished, on
order, in place of the regular equipment, or they
can be supplied additionally at an extra charge.
Unless otherwise ordered, the 71k101 machine will be sent out
fitted with a f inch knife and three additional knives for §, ^ and
J inch buttonholes.
Whip Stitch Buttonholes can be produced on above machine
by substituting the following parts in place of similar parts on
the machine;
249633 Shuttle Bobbin Case complete
40028 Shuttle Body
Stitch Regulating Gears for Whip Stitch
For Machine 7IK10I
249682 - 30 Teeth
249725 - 36 "
249727 - 40 "
249744 - 45 "
For other gears and specifications see page 16.
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Speed
The maximum speed recommended is 2000 stitches per minute.
When the machines are in operation, the tight machine pulley
should turn over to the left as indicated by the arrow in Fig. 5.
To Set Up Machines on SINGER* Universal
Power Tables
The machine is usually set so that its face plate is toward
the edge of the table nearest the operator, about midway between
the leg sections.
rront Pd<j<! of Table
Fig. 2. Underside of Power Table,
showing Belt and Chain Guides for Low Shaft Drive
One hole should be bored for the chain to connect with the
lever ( B, Fig. 5) and another hole for the chain to connect with
the starting lever (D2, Fig. 6).
There are four treadle chain pulleys (C, H, J and K, Fig. 2).
each consisting of a bracket and asingle pulley. Fasten one of
these pulleys {K, Fig-. 2) to the underside of the table directly
below the clamp lifting lever (B, Fig. 5) and in line with the
chain adjusting slide on the left hand treadle. Fasten the second
pulley (II) to the underside of the table directly over the chain
acljnsting^ slide and in line with the first pulley (K). Fasten the
1)iillc\- {(1. Fig. 2) to the underside of the table direct))' below the
starting lever (D2, I-'ig. 6) and in line with the chain adjusting
slide on the right hand treadle, l-^asten the fourth pulle)' (J. Fig.
2) to
the underside of the table directly over the cliain adjusting
slide on the rigiit hand treadle and in line with the pulley ((1).
Bass one chain from the left treadle straight up and over the
pulley (II) and under the pulley (K), then up through the hole
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in the table and fasten to the clamp lifting lever (B, Fig. 5).
Pass the second chain from the
right treadle straight up and over
the pulley (J) and under the pulley (G), then up through the
hole in the table and fasten to the starting lever (D2, Fig. 6).
If the machine is to be driven by a pulley mounted on either
a floor or table shaft to the rear of the idler bracket complete (L),
the idlers and idler arm should be assembled with the pulleys
mounted in the two holes of the arm farthest from the vertical
rod hole, as shown at N, Fig. 3. Should it be necessary to drive
the machine from a shaft lying between the rear of the machine
and the front of the table, the two pulleys should be assembled
with the pulleys mounted in the holes of the arms nearest to the
vertical rod hole, as shown at M, Fig. 3.
Two belt holes (O, Fig. 2) should be bored in the table directly
below the tight machine pulley according to the location shown
by the blueprint furnished with the machine and the belt idler
(L, Fig. 2) mounted on the underside of the table directly below
these
two holes (O). The belt should he applied around the pulley
on the shaft, around the idlers, up through the holes (O) in the
table and around the machine pulley as instructed on page 19.
To Set Up Machines on Universal Power Tables
with SINGER* Electric Motor
The foregoing instructions should be followed with the ex
ception that the belt idlers (L, Fig. 3") and arms must be assem-
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hied as illustrated in Fig. 3. The belt should be applied around
the pulley of motor, around the idlers, up through the holes (O,
Fig. 3) in the table and around the machine pulley as instructed
on page 19.
Machines Run in Pairs
When machines are run in pairs and driven from a table or
floor shaft, they must have belt and belt idlers installed the same
as two individual machines and the chain pulleys mounted ac
cording to the blueprint furnished with the machine.
To install one motor for driving two machines run in pairs,
the motor should be mounted directly below the centre line be
tween the two machines with the tight machine pulley towards
the front of the table as illustrated in Fig. 4. The belt idler pulleys
fR. Fig. 4) must be mounted on their arms (S) as illustrated in
Fig. 4 and the chain pulleys mounted according to the blueprint
furnished with the machine. When individual motors are used
for each machine in pairs, there are no belt idlers used under the
table and the motors are set directly below the machine pulley
and on the same angles that each machine is set with respect to
the table.
For applying belt see instructions on page 19.
Fig. 4. Underside of Table, Showing Location of
Idlers,
Treadle Chain Guides and SINGER Electric Transmitter Motor
for Class 71 Machines when Operated in Pairs
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To Oil the Machine
Use 'TYPE B" or 'TYPE D" OIL, sold by Singer Sewing
Machine Company. For description of these oils, see inside front
cover of this book.
When the machine is received from the factory, it should be
thoroughly cleaned and oiled. Oil should be applied at each of
Fig. 5. Oiling Points at the Right of the Machine
Also Adjustments on the Machine
the places designated by the unmarked arrows in Figs. 5. 6. 7. 21
and 26- When the machine is in continuous use, it should be
oiled regularlv to ensure easy running and prevent unnecessary
wear of the parts which are in movable contact.
It is important to use either of the above heavy grades of oil
for
the feed gears and stop motion mechanism in the rear of the
machine.
Fig. 6. Oiling Points in the Base of the Machine
Also Adjustments on the Machine
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To reach the parts underneath the bed plate, throw the belt
off the machine pulley, disconnect the starting and clamp lifting
chains, then turn the machine over on its hinges.
Occasionally remove the screw (G, Fig. 7) from the loose
pulley and apply a small quantity of BALL BEARING LUBRI
CANT to the ball bearing of the pulley through the tapped hole,
using BALL BEARING LUBRICANT sold by Singer Sewing
Machine Company, then replace the screw (G).
Oil the shuttle bearing at the places indicated by the unlettered
arrows in Fig. 21, Page 23, once each day.
Fig. 7. Oiling Points at the Left of the Machine
Also Adjustments on the Machine
Needles
Needles for Machines 71k101 are Catalogue 1526 (71xl)and
are made in sizes 9, 11, 13, 14, 16, 17, 18, 19, 21 and 22.
The size of the needle to be used should be determined by
the size of the thread which must 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 quantity required, the
size number, and also the catalogue number.
The following is an example of an intelligible order:
'TOO No. 16, Catalogue 1526 Needles."
The best stitching results will be obtained when using needles
sold by Singer Sewing Machine Company.
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9
Thread
For Purl Stitch buttonholes, use right twist thread in the
needle.
For Whip Stitch buttonholes, use left twist thread in the
needle.
Either right or left twist thread may be used on the bobbin.
Fig. 8. How to Determine the Twist
Hold the thread as shown above. Turn .the thread over toward
you between the thumb and forefinger of the right hand; if left
twist, the strands will wind tighter; if right twist, the strands
will unwind.
For Purl Stitch buttonholes, a heavier thread should be used
in the needle than on the bobbin; for example, use No. 30 cotton
in the needle with No. 70 or 80 cotton on the bobbin, or No. 40
cotton in the needle with No. 90 or 100 cotton on the bobbin.
For Whip Stitch buttonholes, use the same size thread for the
needle and the bobbin.
To Remove the Bobbin
Reach down under the bed of the machine with the thumb
and forefinger of the left hand, open the bobbin case latch (B,
Fig. 13) with the forefinger and take out the bobbin case.
While the latch remains open, the bobbin is retained in the
bobbin case. Release the latch, turn the open end of the bobbin
case downward and the bobbin will drop out.
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10
To Wind the Bobbin
Place the bobbin on the bobbin winder spindle and push it
up close against the shoulder, having the small pin in the spindle
enter the slot in the bobbin.
£0375
Fig. 9. Winding the Bobbin
Pass the thread from the unwinder, through the thread guide
(1, Fig. 9) on the bobbin winder tension bracket attached to the
top of the machine, under between the tension discs (2, Fig. 9),
through the thread guide (3, Fig. 9), wind the end of the thread
around the bobbin (4, Fig. 9) a few times, then push the bobbin
winder pulley against the moving belt. When sufficient thread
has been wound upon the bobbin, the bobbin winder will stop
autom^^'Ully. Bobbins can be wound while the machine is
stitching;
, -v
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Fig. 10
11
To Thread the Bobbin Case
Hold the bobbin between the
thumb and forefinger of the right
hand, the thread drawing on the
top from the right toward the left
(See Fig, 10.)
With the left hand hold the bobbin
case as shown in Fig. 10, the slot in
the edge being near the top, and
place the bobbin into it.
Fig. 12
Fig. 11
Then pull the thread into the slot
(1, Fig. 11) in the edge of the bobbin
case, draw the thread under the ten
sion spring and into the delivery eye
(2) at the end of the tension spring,
as shown in Fig. 12.
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To Replace the Bobbin Case
After threading', take the bobbin case by the latch (B, Fig. 13),
holding it between the thumb and forefinger of the left hand.
Pig. 13. Replacing the Bobbin Case
Place the bobbin case on the center stud (A, Fig. 13) of the
shuttle body with the position finger opposite the notch at the
top of the shuttle race. Release the latch and press the bobbin case
back until the latch catches the groove near the end of the stud.
To Set the Needle
Loosen the set screw in the lower end of the needle bar and
put the needle up into the bar as far as it will go with its long
groove toward you and the eye directly in line with the arm of
the machine, then tighten the set screw.
Upper Threading of Machine
(See Figs. 14 and 15)
Pass the thread from the thread unwinder, down through the
hole (1, Fig. 14) in the top of the thread leader post, through the
lower hole (2, Fig. 14) in the post, into the thread retainer (3,
Fig. 14).
through the thread eyelet (4, Fig. 14), around the back
and between the tension discs (5, Fig. 14), through the thread
eyelet (6. Fig. 14). into the thread guide (7, Fig. 15). down, under
and from back to front between the tension discs (8, Fig. 15), up
into the thread take-up spring (9, Fig 15), under the tension
thread guide (10, Fig. 15). up and from back to front through
the hole (11, Fig. 15) in the end of the thread take-up lever, into
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13
the slot (12, Fig. 15) in the face plate, into the wire thread guide
(13, Fig. 15), through the hole (14, Fig. 15) in the lower end of
the needle bar and from front to back through the eye of the
needle (15, Fig. 15). Draw about two inches of thread through
the. eye of the needle with which to begin sewing.
<7)B ^''r ^11
Fig. 14. Upper Threading of Machines
E76S4
Fig. 15. Upper Threading of Machines
E9I93
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To Place the Fabric Under the Clamp and
Start the Machine
Raise the clamp by depressing the left treadle and place the
work under the clamp so that the position for the end of the
buttonhole nearest you is under the needle, then let the clamp
down and start the machine by depressing the treadle at the right.
To Operate the Hand Ratcheting Device
If the thread should break or the bobbin become empty while
stitching, the buttonhole can be quickly repaired at any unfinished
part of the stitching by stopping the machine, disengaging the
stitch regulating gear and operating the hand ratchet lever, as
follows
A B C D E F
Fig. 16. Mechanism for Disengaging Stitch Regulating Gear
Press down the forward end of the stop lever (J, Fig. 17) and
the machine will immediately stop with the needle at its highest
point. Then with the right hand push the stitch gear disengaging
lever (A, Fig. 16) backward to disengage the stitch regulating
gear (F, Fig. 16) and while holding the lever (A) backward,
operate the hand ratchet lever (G, Fig. 17) with the left hand
until the work clamps are moved to the desired position.
To reengage the stitch regulating gear (F), release the disen
gaging lever (A, Fig. 16) and operate the machine slowly by
means of the hand ratchet lever (G, Fig. 17) until the slot in the
stitch regulating gear engages the driving pin in the shaft.
CAUTION: Under no circumstances can the machine be
hand ratcheted unless the stitch regulating gear (F, Fig. 16) is
disengaged. When changing the stitch regulating gear, be sure
that the gear slides freely on the shaft and clamping nut sleeve
(E, Fig. 16).
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To Regulate the Length of Buttonhole
Remove the slide from the left side of the bed of the machine.
The gauge (H, Fig. 17), furnished with the machine, is marked
D
H J
Fig. 17. Showing How to Regulate Length of Buttonhole
according to the style of bar with numbers corresponding to
the different lengths of buttonholes that can be made by the
machine. The gauge (H) is also marked with the letters A, B
and Cwhich correspond to similar letters stamped on the collar
(B, Fig. 17) of machines fitted with thread trimmers, for posi
tioning the needle thread retrimming cam.
Loosen the nut (C, Fig. 17) and place the gauge in the slide-
way as shown in Fig. 17, having the number on the gauge for the
desired length of buttonhole opposite the line in the slideway.
Then move the regulating lever (D, Fig. 17) until the sleeve
under the nut (C) rests against the downward projecting part
of the gauge and tighten the nut (C). Now, raise the cam (A,
Fig. 17) and turn it until the pin enters either of the holes A, B
or C, in the collar (B) according to the letter indicated on the
gauge opposite the length of buttonhole for which the machine is
being adjusted. Then replace the slide in the bed of the machine.
To Change the Number of Stitches
in the Buttonhole
The number of stitches in the buttonhole is controlled by the
stitch regulating gear (F, Fig. 16) at the right hand side of the
machine. When it is desired to change the number of stitches in
the buttonhole, it will only be necessary to change the stitch
regulating gear. To remove this gear, loosen the screw ff'.
Fig. 16) and swing the bracket (C, Fig. 16) with the large gear
(D, Fig. 16) out of mesh with the stitch regulating gear (F).
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16
Then remove the nut (E, Fig. 16) and remove the stitch regulat
ing gear (F) from its shaft.
Stitch Regulating Gears for Machine 71k101
Gear
Number
Number
of Teeth
NeedleDips
perButtonhole
to Rev. of
Feed Wheel
FEED WHEEL
1249802 249841
Counting
Stitches
Bar
Stitches
Blind
Stitches
Counting
Stitches
Bar
Stitches
Blind
Stitches
249675 18
200 83
10 14 88 6
12
•249677
20 180
75
9
12
79 6 10
•249679
24
150
62 8
10 66 58
t•249682
30
120 50
6 8
52 48
•249725
36 100
41 5 8
44
36
249727
40
90
37 56
40 34
249744 45
80 33
4 6 35 34
249897 50
72 30
35
32 2 4
249953
60 60
25
34 26
24
With Feed Wheel 249802 use Barring Plates 249801 and 249804.
Use two 249842 Barring Plates with Feed Wheel 249841.
'Regular equipment, unless otherwise ordered.
IFitted to the machine when shipped from the factory, unless otherwise ordered.
Blind Stitches plus twice the sum of Counting Stitches and Bar Stitches is
equal to the Needle Dips per Revolution of Feed Wheel. For example, with
(»ear 249675 and Feed Wheel 249802
14
-F2(83-F10) =
Having selected the gear desired, place it in position on its
shaft and securely fasten it with the nut (E, Fig. 16) below it.
Swing back the bracket (C,jFig. 16) as far as it will go to bring
the large gear (D, Fig. 16) into mesh with the stitch regulating
gear (F, Fig. 16). Then securely tighten the screw (B, Fig. 16).
To produce perfect purl stitch buttonholes, it is recommended
to use the stitch regulating gears listed above for the 71K101
machine.
For production reasons, other stitch regulating gears having a
greater or less number of teeth may be used. However, there may
200
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17
be a slight and occasional misalignment of stitch formation when
leaving the first bar. This defect in many cases is not objectionable
in purl stitch buttonholes
and is not noticeable when making whip
stitch buttonholes.
To Regulate the Tensions
Machine 7lKl01 has two thumb nuts (B and D,
Fig. 7) for regulating the tension on the needle thread. When
making purl stitch buttonholes the tension on the needle thread
should be sufficiently strong to draw the purl evenly to the upper
side of the buttonhole. When making whip stitch buttonholes
the tension on the needle thread should be set equal to the tension
on the bobbin thread.
For further adjustment of the needle thread tension on these
machines, see page 24.
The tension on the bobbin thread is regulated by the screw
(A,
Fig. 11) in the bobbin case tension spring. To increase the
tension, turn this screw over to the right. To decrease the ten
sion, turn the screw over to the left. The tension on the bobbin
thread should be light.
To Regulate the Width of Bight
Fig. 18
Adjustments on the Machine
ment may be necessary to prevent the overthrow of the barring
stitches while running at high speed. This adjustment is made
as follows:
Turn the tight machine pulley by hand until the bar tripping
point (E3, Fig. 22) rides upon the top of the barring plate (F3.
Fig. 22). Loosen the adjusting screw (U2, Fig. 18) and set screw
(T2, Fig. 18) in the opposite end of the same tapped hole, then
turn the adjusting screw until there is very little play in the
barring slide, after which the set screw should be turned in
against the end of the adjusting screw to lock it in position.
The width of bight is regu
lated by loosening the nut (V2,
Fig. 18)
and movingthe stud in
the slotted link at the top of
the machine. To increase the
width of bight, loosen the nut
(V2) and move the stud to
the left in the slotted link. To
decrease the width of bight,
move the stud to the right in
the slotted link. When the
desired width of bight is ob
tained, securely tighten the
nut (V2).
When the width of bight has
been changed,a furtheradjust-
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18
To Adjust the Knife Slit in the Needle Plate
When the knife descends to cut the buttonhole, it must enter
exactly in the center of the slit in the^needle plate. In case the
knife does not enter in the center of the slit, loosen the thumb
screw (G2, Fig. 6) under the bed of the machine and move the
clamp carrier slide until the knife is in the center of the slit, then
tighten the thumb screw.
To Regulate the Cutting Space
The amount of cutting space between the lines of stitching is
regulated by the screw (E, Fig. 7) in the slot in the bed of the
machine. To make the cutting space wider, loosen this screw and
move it toward the back of the slot. To make the cutting space
narrower, move the screw toward you in the slot, then tighten
the screw.
When making buttonholes in either light or heavy materials,
the stitching should always be adjusted centrally to the knife,
either with or without
cutting space. To position the needle
correctly, use the following instructions for adjusting the knife
slit in the needle plate and aligning the needle bar.
To Align the Needle Bar with the Knife
The needle bar frame pitman is adjustable by means of the
two screws (C, Fig. 7); loosen these screws and move the needle
bar frame until the needle on the right hand dip and knife are in
exact alignment or to the left of the knife, half the amount of the
cutting space, when the machine is stitching the first side of the
buttonhole.
Should the knife cut too closely to the left hand side of the
buttonhole, the needle bar frame pitman should be adjusted to
throw the needle slightly more to the left. If the knife is cutting
too closely to the right hand side of the buttonhole, the needle
bar frame pitman should be adjusted to throw the needle slightly
more to the right.
To Set the Knife
Take out the screw (B, Fig. 24) in the knife holder and remove
the old knife. Place the new knife in the holder and push it up as
far as it will go, then fasten it with the screw and washer. If the
knife does not make afull cut, it should be set lower. The front
edge of the knife should descend about ^ inch below the top of
the needle plate, but not low enough to strike the shuttle. The
knife should be kept sharp to ensure clean buttonholes.
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