UnionSpecial 57700 Series Instruction sheet

STYLE
577008
TALOG
No.
131L
CL ASS 57700
ADVANCED HIGH SPEED
FIFTY THOU S AND SERIES
DIFFERENTIAL FEED
FLAT BED MACHINES
INDUSTRIAL
SEWING
MACHINES
UNION SPECIAL CORPORATION
C H I C AGO
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Catalog No. 131 L
(Supplement to Catalog No. 131 M)
INSTRUCTIONS
FOR
ADJUSTING AND OPERATING
LIST OF PARTS
CLASS 57700
Style
57700 B
First Edition
Copyright 1971
by
Union Special Corporation
Rights Reserved in All Countries
UNION SPECIAL CORPORATIO N
INDUSTRIAL SEWING MACHINES
CHIC A GO
Printed in U.S. A.
2
May, 1979
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IDENTIFICATION OF MACHINES
Each UNION SPECIAL machine is identified by a Style number on a name plate
on the machine. Style numbers are classified as standard and special. Standard Style
numbers have one or more letters suffixed, but never contain the letter "Z". Example :
••style
57700 B". Special Style numbers contain the letter "Z". When only minor
changes are made in a standard machine, a "Z" is suffixed to the Standard Style
number. Example: "Style 57700 BZ".
Styles of machines similar in construction are grouped under a Class number
which differs from the Style number, in that it contains no letters. Example: "Class
57700".
APPLICATION OF CATALOG
This catalog is a supplement to Catalog No. 131 M and should be used in con-
junction therewith. Only the parts found on Style 57700 B but not on Style 57700 L
are illustrated. At the back are illustrations identifying the parts by reference
number and on the opposite page, the part numbers and descriptions identifies the
part. Any part that is a component of another part is indicated by indenting its
description under the description of the assembly or base part. Always use the part
number in the second column, never use the reference number in the first column
when ordering repair parts.
STYLE OF MACHINE
Advanced High Speed, Two Needle, One Looper, Differential Feed Flat Bed Machine,
Medium Throw, Needle Bearing Needle Bar Drive, Light Weight Presser Bar and
Needle Bar Driving Mechanism, Single Reservoir, Enclosed Positive Automatic
Lubricating System, Filtered Oil Return Pumps for Head and Base, Needle Bearings
and Bronze Bearings for Feed Bar and Feed Rocker Shafts, Greased and Sealed .
Lateral Looper Travel, Single Disc Take-up, Large Handwheel and Improved Belt
Guard. Prepared for use with Knee Press for Presser Foot Lifter, Equipped with
Rotary Thread Tensions, Maximum Work Space to Right of Needle Bar 8 1f 4 Inches .
57700 B Offset differential feed machine for attaching long length rib knit strip cut
perpendicular to the wale or parallel with the wale to knitted undergarments and
similar operations on medium to medium heavy weight material. Standard
gauge No. 12 only. Seam specification 406-BSb-1. Type 121 GS needle.
Maximum recommended speed 6000 R. P.M.
NEEDLES
Each UNIONSPECIALneedle has both a type and size number. The type number
denotes the kind of shank, point, length, groove, finish and other details. The size
number, stamped on the needle shank, denotes largest diameter of blade, measured
in thousandths of an inch, midway between shank and eye. Collectively, the type and
size number represent the complete symbol, which is given on the label of all needles
packaged and sold by Union Special.
The standard recommended needle for the machine covered by this catalog
is Type 121 GS. Below is the description and sizes available of the recommended
needle.
Type No.
121
GS
Description and Sizes
Round shank, round point, short, double groove, struck groove,
chromiumplated- availableinsizes 065/025, 070/027, 075/029,
080/032, 090/036, 100/040, 110/044, 125/049, 140/054.
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NEEDLES (Continued)
To have needle orders promptly and accurately filled, an empty package, a
sample needle, or the type and size number should be forwarded. Use description
on label. A complete order would read: "1000 needles, Type 121 GS, Size 080/032".
Selection of proper needle size is determined by the size of thread used. Thread
should pass freely through needle eye in order to produce a good stitch formation.
Success in the operation of UNION SPECIAL machines can be secured only by
use of needles packaged under our brand name, ~® , which is backed by
a reputation for producing highest quality needles in materials and workmanship for
more than three-quarters of a century.
4
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FILL
MAIN
RESERVOIR
HERE
CAUTION!
THREAD WRAPPED AROUND
2 1/4 TURNS CLOCKWISE
FILL ALL OIL RESERVOIRS
BEFORE STARTING.
MACHINE HAS BEEN DRAINED
BEFORE SHIPPING.
THREADING AND OILING DIAGRAM FOR STYLE 57700 B MACHINES
Thread machine as indicated. The looper threading has been enlarged for clarity.
The oil has been drained from the machine before shipping and the reservoir must be filled
before starting to operate. To fill machine with oil, remove plug screw in top cover and add oil
until needle of oil gauge is in yellow baBd marked "FULL". Use a straight mineral oil of a Saybolt
viscosity of 90 to 125 seconds at 100 Fahrenheit. Maintain oil level in "OPERATE" position
and add oil when needle is in yellow band marked ''LOW". The machine is automatically lubricated
and no oiling other than keeping the main reservoir filled is necessary.
Excessive oil in the main reservoir may be drained at the plug screw in the main frame to the
left of the oil gauge.
5
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INSTRUCTIONS FOR MECHANICS
LUBRICATION
CAUTION! Oil has been drained from the main reservoir before shipment, 1 so the
reservoir must be filled to the proper level as indicated on oil gaug e (A ~ Fig. 1)
before beginning to operate. Run machine slowly for several minutes to distribute
the oil to the various parts. Full speed operation can then be expected without damage .
RECOMMENDED OIL
Use a straight mineral oil of a Saybolt viscosity of 90 to 125 seconds at 100°
Fahrenheit in the main reservoir. This is equivalent to Union Special specification
No. 17 5. Fill main reservoir at plug screw in upper crank chamber cover (A, Fig. 2)
and check oil level at gauge (B). Oil is at maximum level when needle is in yellow
band marked "Full". Oil should be added when needle is in yellow band marked "Low".
CAUTION! It is important that these machines not be over filled.
It is recommended that a new machine~ or one that has been out of service for
an extended period be lubricated as follows: Remove the head cover, clean out lint
and directly oil the needle bar link and the needle bar. Replace head cover as no
further hand oiling will be required. Run machine slowly for several minutes to
distribute oil to the various parts.
Oil may be drained from main reservoir by removing plug screw (C, Fig. 2)
located below the cloth plate at front of the machine.
NOTE: Looper avoid and feed lift eccentrics receive oil thru the mainshaft, so when
assembling be sure oil holes in the eccentric lines up with oil holes in mainshaft when
spot screw is in timespot.
OIL GAUGE
The oil gauge is set at the factory to show
the proper oil level in the reservoir. Should an
adjustment become necessary, however, the
following steps should be followed:
1. Place the machine upright on a level
table or bench.
2. Remove the oil reservoir plug screw
(C, Fig. 2) and tip machine forward to
drain oil from the reservoir.
3. Make sure all oil is drained from main
reservoir.
4. Remove lower crank chamber cover,
located at the back of the machine •
5. Fill main reservoir to a level even
with the bottom contour of the knee
press shaft bushing (D, Fig. 2).
6. Loosen lock nut (E) on calibrating
screw (F), and turn the screw to the
left or right until the gauge needle
rests in the middle of the yellow band
marked "LOW".
7. Tighten lock nut (E) and replace plug
screw (C).
8. Add oil so that gauge needle rests in the
middle of the yellow band marked
"FULL".
6
Fig. 2
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NEEDLE LEVER BEARING OILER
Remove the head cover and upper crank
chamber cover (G, Fig. 2). Check position of
needle lever bearing oiler (A, Fig. 3) located
inside the arm casting, below the upper crank
chamber cover, which lubricates the needle
lever stud (B). Make sure it is tilted downwardly
and that its delivery end (C) contacts the inside
wall of the bed casting at the back, just above the
notch of the needle lever shaft stop collar. (Do
not allow the oiler to rest on the needle lever).
Allow 1/64 inch clearance as in Fig. 3.
ALIGNING THE NEEDLE BAR
Fig. 3
Align the needle bar (A, Fig. 4) and set to
height, using the proper test pins and test plate of the right gauge.
Insert test pin No. 699 L in the left seat of the needle
holder and test pin No. 699 R-12 in the right needle seat.
Now assemble test plate No. 698 BB-12 to machine using
the throat plate attaching screws. The needle bar is
located properly if the test pins align with the holes in the
test plate and the height of the needle bar is correct when
the shoulder of the test pins rest on the test plate, when
the needle is at its lowest position.
If test plate and test pins are not available, insert a
new set of needles (Type and Size as required) and align
the needle bar so the needles center in the needle holes
of throat plate. To align needle bar, loosen needle bar
clamp screw (B, Fig. 4) and turn bar as required. Tighten
clamp screw.
SYNCHRONIZING LOOPER AND NEEDLE MOTIONS
Insert the looper in the looper rocker and turn hand-
wheel in operating direction until the point of the looper
(A, Fig. 5), moving to the left is even with the left side
of right needle (B). Note the height of the eye of the
needle with respect to the looper point, then turn hand-
wheel in the reverse direction until the looper point again
moves to the left, and is even with the left side of the
right needle. If the motions synchronize, the height of the
Fig. 4
eye of the needle with respect to the looper point will be the same. A variation of
• 005 inch is allowable. If the distance from the eye of the needle to the point of the
looper is greatest when the pulley is turned in the operating direction, move the
looper drive shaft synchronizing stud (A, Fig. 6) to the rear. Moving it in the
opposite direction acts the reverse.
Moving of the looper drive lever shaft synchronizing stud is accomplished as
follows: Loosen the clamp screw (B, Fig. 6) of the looper drive lever (C). To move
stud to rear (away from operator), a light tap with a small hammer, directly on the
stud, is all that is required. To move stud forward (toward operator), remove the
cloth plate, oil reservoir top cover and oil reservoir back cover, then, a light tap
on the looper drive lever rocker shaft, toward the operator, is all that is required.
Then, using the looper drive lever to take up the end play between the looper drive
lever rocker shaft and its synchronizing stud, tighten the looper drive lever on the
shaft, using screw (B, Fig. 6).
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SYNCHRONIZING LOOPER AND NEEDLE MOTIONS (Continued)
With the looper at the extreme right
end of its travel, check the location of
the center line of the right looper con-
necting rod bearing, using gauge No.
21227 CX. Remove nut (C, Fig. 5) and
place hole in gauge over threaded stud .
The left end of the gauge should locate
against the right side of the looper
rocker cone (D). If adjustment is nec -
essary, loosen the clamp screw (B, Fig .
6) and reposition the looper drive lever
(C) as required. Tighten clamp screw.
If gauge is not available, setting can be
checked with a scale. The distance
between the center line of the looper
rocker cone and the center line of the
looper lever stud should be 4 1/16 inches
(Fig. 6), when looper is at the extreme
right end of its travel.
SETTING THE LOOPER
Insert a new needle in the right needle seat, type
Fig. 6
Fig. 5
and size as specified. If the
looper gauge is 7/32
inch, for example, set
the looper (D, Fig. 6)
so the distance from the
center of the right needle
(E) to the point of the
looper is 7/32 inch,
when the looper is at its
farthest position to the
right. Looper gauge No •
21225-7/32 can be used
advantageously in mak-
ing this adjustment. If
adjustment is required ,
loosen nut (F) (it has a
left hand thread) and nut
(G) on connecting rod
. (H), turn the connecting
rod forward or backward
to obtain the 7/32 inch
dimension. Retighten
both nuts, first nut (G)
and then nut (F). Make
sure the left ball joint
is in vertical position and does not bind after adjustment.
Fig. 7
The looper is set correctly in line- of- feed,
if, as it moves to the left, behind the needle,
its point (A, Fig. 7) brushes, but does not pick
at the rear of the needle (B).
If adjustment is necessary, loosen lock
screw (J, Fig. 6) and turn stop screw (K) as
required. Turning stop screw clockwise sets
the looper to the rear and turning it counter-
clockwise acts the reverse. Holding looper to
8
Fig. 8
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SETTING THE LOOPER (Continued)
the front while making this adjustment may prove helpful. Tighten lock screw whE'n
setting is obtained and recheck the adjustment.
SETTING HEIGHT OF NEEDLE BAR
The height of the needle (C. Fig. 4) is correct when the top of its eye is 3/64
inch below the underside of the looper, with the looper point flush with the left side
of the needle. If adjustment is necessary, loosen screw (B) and move needle bar (A)
up or down as required and retighten screw. Care should be taken not to disturb the
alignment of the needle bar when moving the needle bar either up or down.
The needles are to have equal clearance on the right and left sides of needle
slots in throat plate.
SETTING THE MAIN FEED DOG
The main feed dog should be set to rise the depth of a full tooth, or approximately
3/64 inch above the throat plate, at the highest point of travel. The feed dog should
be centered in the slots of the throat plate at maximum feed travel.
Fig. 9
To raise or lower the main feed dog, loosen allen screw (A, Fig. 8) and adjust
the feed dog holder (B) to set the feed dog at specified height. Retighten screw (A) •
NOTE: A change of feed dog height will necessitate a check of the rear needle guard
setting.
The main . feed dog should have equal clearance on all sides of feed slots in the
throat plate at maximum feed travel. To adjust the main feed dog across-the-line-
of-feed, loosen screws (C, Fig. 8) and position feed dog as required. Retighten
screws (C). To adjust main feed dog in-line-of-feed, loosen nut (A, Fig. 9) and
move feed bar as required. Retighten nut.
9
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SETTING THE DIFFERENTIAL FEED DOG
The differential feed dog should also be set to rise the depth of a full tooth above
the throat plate, at the highest point of travel and center in the feed slots of the
throat plate at maximum feed travel. In addition to this the teeth of the feed dog
should be parallel to the top surface of the throat plate across-the-line-of-feed.
To raise or lower the differential feed dog, loosen screw (B, Fig. 9) and set
the feed dog at the required height. Retighten screw.
Loosen set screws (C, Fig. 9) and move the differential feed bar (D) forward
or backward as required. The loosening of set screws (C) will also allow the differ-
ential feed bar (D) to be rotated, so the differential feed dog can be aligned parallel
with the top surface of the throat plate, across-the-line-of-feed. Tighten screws
securely.
NOTE: Turn machine by hand to make sure the differential feed dog has clearance
through its cycle and does not contact the main feed dog at back end of its travel or
the throat plate at the forward end of its travel.
Fig. 10
SETTING THE DIFFERENTIAL FEED RATIO
The differential feed ratio is set by loosening screw (A, Fig. 10) and moving the
selector slide (B) to the desired position. The screw and selector slide are access-
ible through the t op of the cloth plate on the left side. Moving the differential feed
selector slide (B) toward the front increases the amount of differential and moving
it back decreases the differential feed. Retighten screw.
This Class of machine has a stretching ratio of 3/4 to 1 up to a gathering ratio
of 2 to 1, depending on the length of stitch set at the main feed dog. Turn machine
by hand, making sure the differential feed dog clears the main feed at the back end of
its stroke.
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