UnionSpecial Picoetta G79000 Series Instruction Manual

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CATALOG No. 60
Instructions for Installing, Operating and Adjusting
with List of Parts
Picoetta Machines
Class G79000
UNION SPECIAL MACHINE COMPANY
General Olllce and Factory: 400 North Franklin Street
CHICAGO. ILLINOIS
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BRANCHES AND SERVICE STATIONS, UNITED STATES
IJostoii. Muss.
T^iin, Mass.
Havcrhili. Mass.
New York. N. Y.
Utiea. N. Y.
Rochester, X. Y.
.Johnson City. N. Y.
Buffalo, N. Y.
Troy. N. Y.
Philadelphia, Pa.
Reading, Pa.
Cincinnati, Ohio
Cleveland, Ohio
Toledo, Ohio
Minneapolis, Miun.
St. Louis, Mo.
Kansas City, Mo.
I,OS Angeles, Cal.
San Francisco. Cal.
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SERVICE REPRESENTATIVES, UNITED STATES
A • ■ ,jl
Newark, N. J.
Ualtiniuro, Md.
Detroit, Mich.
Knoxville, Tenn.
-Atlanta, Ga.
Milwaukee, Wis.
Dallas. Texas
New Orleans, La.
Seattle, Wash.
BRANCHES—FOREIGN
Union Special Machine Corporation of America.
Union Special Machine Company of Canada, Ltd.
Union Special Machine Company of Catiada, Ltd.
Union Special Machine Corporation of America.
Union Special Machine Corporation of America.
Union Special Macliine Coi^oration of America.
Compagnic des Machines U nion Special do France.
Cotnpagnie dcs Machines Union Special de France.
Belgium, Brussels
Canada, Toronto
Canada, Montreal
Denmark. Copenhagen
England Leicester
England. London
France, Paris
France, Lyons
"i
UNION SPECIAL MASCHINENFABRIK, G. m. b. H.
Genera! Office and Factory: STUTTGART. GERMANY
BRANCHES AND SERVICE STATIONS, GERMANY
Berlin
Chemnitz
Koln
Ebingcn
Erfurt
Franhfurt am Main
Foreign Distributors and Service Stations
are Found in:
Argentine Republic
England
New Zealand
Buenos Aires
Leeds Aurklniid
Austria
Manchester
Christchurch
Vienna
Norwich Wellington
Australia
French Indo China
Pbillpaine Islanda
Melbourne
Saigon Manila
Sydney
Hawaiian Islands
Portugal
Honolulu Oporto
Brazil
India
Scotland
Rio de Janeiro
Bombay Glasgow
Santos
Calcutta
Dundee
Sao Paulo
Ireland
Slam
China
Belfast
Bangkok
Hong Kong
Italy
South Africa
Shanghai
Milan Jolianncsburg
Cuba
Japan Durban
Havana
Osaka
Capetown
Santiago
Tokyo
Port Elizabeth
Dutch East Indies
Mauritius
Spain
Soerabaya, Java
Port Louis
Barcelona
Ecuador
Mexico
Uruguay
Guayaquil
Mexico City Montevideo
Copyright. 102S, Union Special Machine Co.. Printed in U. S. A.
From the library of: Superior Sewing Machine & Supply LLC

Installation of Picoetta Machine
From the library of: Superior Sewing Machine & Supply LLC

CLASS G79000—PICOETTA MACHINES
Style G79000 A
Style G79000B
Style G79000 C
Style G79000 D
Style G79000 E
For joining two pieces of fabric; fagotting
effect, makes 3 stitches to right, 3 stitches to
left and repeats, plain feed both sides of
needle.
For edging woven fabrics; handkerchiefs,
dresses, lingerie and similar articles, pointed
lace effect, makes 3 stitches to right, 3 stitches
to left and repeats, plain feed to left of needle.
For edging woven fabrics; handkerchiefs,
dresses, lingerie and similar articles, arched
lace effect, makes 4 stitches to right, 4 stitches
to left and repeats, plain feed to left of needle.
For edging knitted and other elastic fabrics;
arched lace effect, makes 4 stitches to right, A
stitches to left and repeats, differential feed to
left of needle.
For edging knitted and other elastic fabrics;
pointed lace effect, makes 3 stitches to right,
3 stitches to left and repeats, differential feed
to left of needle.
PRODUCTIONS
When picoetta edging ladies' collars, cuffs, brassieres, lingerie
and similar articles, the machines will complete 50 to 55 yards of
lineal stitching per hour. A production of 3 dozen handkerchiefs
per hour is easily obtained.
INSTALLING
READY TO OPERATE Before shipment, each machine is
thoroughly run in, accurately adjusted, tested and carefully
inspected. This is evidenced by the test sample left in the
machine. Packed by skilled hands, they arrive at their destina
tion ready for service.
The illustration on page 2 shows the general plan of installa
tion.
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Style
G79000 A
Style
G79000 B
Style
G79000 E
Style
G79000 C
Style
G79000 D
U' • • - 'J 5*^, i r f I'i--'jif
4 ]
' slEti if i
Photographic reproductions of stitching accomplished on
Picoetta Machines
Class G79000
From the library of: Superior Sewing Machine & Supply LLC

Installing (Cont'd)
TREADLES The transmitter treadle is so located that its cen
ter is directly under the needle.
The treadle for lifting the presser foot is located to the right
of the transmitter treadle.
PULLEYS The split pulleys are generally bored for a ItVinch
line shaft, and are furnished in the following sizes: 6, 8, 9, 10.
11,12, 13, 14 and 15 inches.
BELTS The transmission of power from the transmitter is by
means of a round belt 9/32 inch in diameter and from the line
shaft to the transmitter by means of a fl at belt 1 inch wide.
The belts must be placed so that the top of the hand wheel runs
from the operator.
SPEED The machine will run at a maximum speed of 1500
stitches per minute, and this speed should not be exceeded.
OPERATING
STARTING THE MACHINE Thoroughly clean and oil the
machine before starting it. Then turn the hand wheel in the
direction the machine runs a few times and see that machine
turns freely. If this is the case, it is ready for sewing.
OILING High speed machines must be oiled carefully and fre
quently with an oil which is free from rosin and acid and which
will not gum or become rancid. The oiling should be done in a
systematic way every day before starting the machine and care
should be taken that all the oil holes are supplied with oil. (See
Illustration "A," Page 6.)
The left end of the needle lever is fi tted with hollow pins which
contain ball oilers. When oiling press the tip of the oil can spout
against the ball and force the oil in. The needle lever connect
ing rod bearings have similar oilers.
Frequent oiling is necessary as lint quickly absorbs the oil. It
is recommended that the machine be given a thorough oiling
four times a day.
The transmitter is lubricated with solid oil through a hollow
main shaft from a compression cup, which should be screwed up
about once a week. If the bearings run hot, the compression
cup should be screwed up immediately. Refilling will not be
required oftener than once a month. .
CLEANING The machine should be cleaned every day. With
the aid of a long handled paint or vaniish brush the accumula
tion of lint, dust, etc., in the lower part of the machine can be
easily removed. To thoroughly clean the machine it is recom
mended to remove the cloth plate.
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Operating (Cont'd)
SETTING THE NEEDLE The needles for this class of machine
are designated Type No. 8021. They are made with a double
groove of which the longer one enters the eye of the needle. The
needle must be set so that the long groove, which enters the eye
of the needle is directly in front of the operator, and the eye
itself is in line with the stitching. Insert the needle as far up
into the needle bar as it will go, and tighten the needle clamp nut.
The size of the needle must be in proportion to the diameter
of the thread, that is, the thread must pass freely through the
eye of the needle. If the needle is too small for the thread it
will cause frequent breakage.
» fa
f7 is 15 ' 15 a „
Illustration "A"
01 Sehtyamm
THREADING Illustration "A" shows the correct threading of
the machine. The needle thread "A" passes from the thread
stand through the guide, adjacent to the front tension, thence
down to the right between the two tension discs, thence directly
up through the check spring, thence through guide No. 113 to
the eyelet fastened to the needle lever, thence to the eyelet fas
tened to the upper end of the needle bar and over the pin which
extends at a right angle to the needle bar, thence downward
between the tension discs which are attached to the needle bar
and into the needle.
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Operating (Cont'd)
The looper thread "B" passes from the thread stand through
the guide adjacent to the rear tension, thence between the ten
sion discs, thence downward through the guide No. 40 which is
located in the rear of the frame at the ri ght side, thence through
the guiding tube, thence between the two springs Nos. 57 and
58, thence through the two openings of the take-up thread eyelet
No. 103 and into the looper. Leave about three inches of thread
hang loosely from the end of the looper.
IMPORTANT HINTS Should the machine fail to function
properly, yet seems to be in good condition, any one of the fol
lowing reasons may be the cause:
(1) See if the machine is threaded correctly, especially at
the different tension devices and remove all lint which
may have accumulated between the tension discs.
(2) Examine the needle and see if it is set in the correct
position and properly seated in the needle bar.
(3) See if the needle is perfectly straight and if the point is
perfect.
(4) If the needle is damaged or bent install a new needle.
(5) See if the thread passes freely through the eye of the
needle.
(6) Clean and oil the machine carefully.
Should the machine still fail to operate properly, it is probable
that some part of the machine needs adjusting.
ADJUSTING
CAUTION Whenever any changes have been made in the
machine always tuiii the hand wheel in the operative direction
a few times to make sure there is no bind. Do not run the
machine until this test has been made, as otherwise, damage
may result.
NEEDLE AND LOOPER Insert a new needle in needle bar,
then turn hand wheel in operative direction until looper reaches
its farthest position to the right which also brings the needle
bar to its lowest point of travel. At this time the distance from
the point of looper to the center of needle should be inch
(use looper adjusting gauge No. 21225-'i4)-
When the looper moves to the left, its point should pass the
needle with a distance of .005 inch between them. This adjust
ment is accomplished by loosening the set screws in looper
eccentric fork No. 79090, after which the looper can be moved
to the desired position.
Again tura the machine in operative direction until the needle
reaches its lowest point of travel and farthest position to the
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Adjusting (Cont'd)
left. As the needle moves upwardly from this point, and looper
moves to left, the point of the looper should pass 1/64 inch above
the upper edge of eye in needle.
LOOP RETAINER The loop retainer No. 79011 is adjustable
universally. Its function is to retain the loop of the needle
thread until the point of the descending needle passes back of
the looper as it moves to the right. The adjustment is as follows:
During the forward motion of the looper (to the left) the
Fig. 1
point of the loop retainer must pass close to the upper edge of the
looper without touching it at any point. As soon as the looper
moves backward, the loop retainer starts on its way back over
the upper edge of the looper, and the point of the hook must pass
as near as possible to the back of the looper without contacting.
The loop retainer must be set so that when the needle descends
past the looper, the distance from the center of the needle to the
hook is inch (see Figure 1). Care should be taken to see that
the loop retainer does not contact the looper at any point.
CAST OFF WIRE The lower portion No. 79004 should be set
so that it is inch from the bottom of the slot of the take-up
No. 79023. The upper portion No. 79004 A should be set so that
the rear prong retains the thread to the point where the periph
ery of the cam recedes, when the thread must become free
and move forward to the front prong, which retains the thread
until the take-up has completed its cycle and releases the lower
thread. Care should be taken to see that the points over which
the thread passes are smoothly polished, especially the take-up.
Springs Nos. 57 and 58 should be open while the looper makes
its forward motion to the left, but must be closed as soon as it
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Adjusting (Cont'd)
starts to move to the right. The opening and closing of both
springs is regulated with the screw found underneath them.
(See Figure 2.)
A/iS7
A/^sa
m97
REGULATING LENGTH Open the clotli plate slide No. 2 A at
OF STITCH the left side of the machine, and
turn the hand wheel in the operative direction until the middle
or large screw head No. 82 is in view, then by means of the com
bination screw driver and wrench while holding the hand wheel
stationary, loosen the nut No. 18, then regulate the length of the
stitch by turning the middle screw No. 82. To make the stitch
longer, turn this screw to the right; to shorten, turn to the left.
The nut must then be tightened.
FEED DOGS Feed dogs should be set so the tips of their teeth
extend i^ch above the throat plate when at the highest point
of travel.
Machines equipped with a differential feed are provided with
an adjustment for controlling the travel of the differential feed
dog independently of the main feed dog. By loosening the nut
No. 5144 the stud No. 79046 B can be moved in the segment slot
of the feed rocker No. 5156. Moving the stud upwardly increases
the travel; moving it downwardly acts the reverse.
TENSIONS To obtain perfect work a great deal depends on
proper tensions on the threads and a suitable length of stitch
commensurate with the size of thread employed. The tension on
the needle thread should be as tight as is consistent with its
strength. The tension on the looper thread should be only suffi
cient to steady it in passing through the machine.
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Plate 1
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79024 A
79024B
79024C
79024D
79030A 79030C
79030B 79030D
79024E
79030 D1 79030F
79030E 79030G
iJL
79024 r A 79024 D B
79024F
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