UnionSpecial 39500PA Setup guide

CATALOG NO.
103PA
First Edition
STYLES
39500PA
39500PE
39500PF
39500PP
39500PT
39500PW
Finest Quality
Adjusting instructions and
illustrated parts list ([)
Class 39500-Differential feed overseamers
with thumbscrew adjusted feed travel
From the library of: Superior Sewing Machine & Supply LLC

FOREWORD
This technical manual has been prepared to guide you in the maintenance of your
new UNION SPECIAL machine. Careful attention to the instructions for operating and
adjusting these machines will enable you to maintain the superior performance and re-
liability designed and built into every UNION SPECIAL machine.
The Adjusting Instructions portion of this manual explains in detail the proper
setting for each of the components related to forming the stitch and completing the
functions
of the machine. The text of the Adjustments is divided into two sections -
Check and Procedure. The Check depicts conditions when the parts are adjusted cor-
rectly. The Procedure is given to explain the proper steps to be taken in the event
adjustments are required. Figures are
used to illustrate the adjustments using refer-
ence letters to point out specific items discussed.
Adjustments are presented in sequence
so that a logical progression is accom-
plished. Some adjustments performed out of sequence may have an adverse effect on
the function of other related parts.
Implementation of preventative maintenance procedures can bring about signifi-
cant improvements in operator productivity by avoiding costly equipment breakdowns.
Whenever it becomes necessary to make repairs or replace parts on your machine, be
sure to insist on genuine UNION SPECIAL Repair Parts. These parts are designed speci-
fically for your machine and manufactured with utmost precision to assure long last-
ing service.
To simplify identification of repair parts, the mechanisms are illustrated by
exploded views. These illustrations will usually be shown in conjunction with a KEY
VIEW which presents the mechanisms of the machine assembled. The specific parts
illustrated on this page will appear shaded in the KEY VIEW.
Catalog No. 103 PA
39500 PA
39500 PE
39500 PF
For Styles
39500 pp
39500 PT
39500 PW
First Edition
Copyright 1981
By
Union Special Corporation
Rights Reserved In All Countries
Printed In U.S.A.
May, 1981
2
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CLASS DESCRIPTION
High Speed, one and two curved needles, two loopers, three and four thread, differ-
ential feed overseaming machines. Fabric trimmer with spring pressed lower knife.
Independent
thumbscrew adjustments for main and differential feed travel. Enclosed
automatic
lubrication system. Fan cooled.
STITCH AND
SEAM TYPE .......... .
FEED SYSTEM ........ .
MAXIMUM SPEED ...... .
(Depending on
Operation)
LUBRICATION ........ .
TECHNICAL DATA
504 SSa-1, Styles 39500 PA, PE, PF, PP, PT
512 SSa-2, Style 39500 PW
Independent thumbscrew adjustments for both
Main and Differential Feeds.
6500 RPM, Styles 39500 PF, PP, PT, PW
7000 RPM, Styles 39500 PA, PE
Enclosed Automatic Splash System with Oil
Return Pump
MACHINE STYLES
39500 PA- One needle, low capacity machine for sewing light to mediumweight knit or
woven fabrics. Stitch range is 8-20 S.P.I. Typical application - For seaming long
straight seams on pajamas and women's underwear. Available Seam Widths: 3/32 inch
(2.4mm), l/8 inch (3.2mm), 5/32 inch (4mm).
39500 PE - Same as 39500 PA except fitted with narrow sewing parts. Typical applica-
tion -
Seaming women's robes and lingerie.
39500 PF - Same as 39500 PA except machine is high capacity for sewing medium to
heavyweight knit
or woven fabrics. Also equipped with a main feed dog having 16
T.P.I. Stitch range is 8-16 S.P.I.
39500 PP- Same as 39500 PF except equipped with a main feed dog having 12 T.P.I.
39500 PT - Same as 39500 PF except prepared for continuous or intermittent shirring.
Maximum shirring ratio is 3 to 1. Available Seam Width: 1/8 inch (3.2mm).
39500 PW - Same as 39500 PP except machine has two needles. Available Seam Width:
17I 64 inch ( 6. 7mm) .
IDENTIFICATION OF MACHINES
Each UNION SPECIAL machine carries a style number, which on this class machine is
stamped in the style plate located to the right rear of the machine.
The serial number is stamped in the extension of casting at the right rear base of
machine.
3
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SAFETY RULES
A
CAUTION!
THIS SAFETY SYMBOL INDICATES YOUR PERSONAL SAFETY IS INVOLVED.
TO PREVENT PERSONAL INJURY:
-All power sources to the machine MUST be TURNED OFF before threading, oiling, ad-
justing or replacing parts.
- Wear safety glasses.
-
All shields and guards MUST be in position before operating machine.
- DO NOT tamper with safety shields, guards, etc., while machine is in operation.
LUBRICATION
Oil capacity of Class 39500 is eight ounces (227 milliliters). Use a straight
mineral oil with a Saybolt viscosity of 90 to 125 seconds at 100 degrees F. This is
equivalent to UNION SPECIAL specification No. 175.
Machine is filled with oil at spring cap in top cover. Before operating, check
oil level at sight gauge on front of machine. When proper oil level is reached, red
bulb
on oil level indicator will register between red gauge lines.
To drain oil remove magnetic plug from back of machine near bottom edge of base.
Clean magnetic plug of any metallic material that may have accumulated in crankcase.
Oil MUST be changed periodically to minimize wear.
THREADING
Be sure machine is threaded properly according to threading diagram Fig. 1, for
Styles 39500 PA, PE, PF, PP, PT, or Fig. lA, for Style 39500 PW.
THREADING DIAGRAM STYLES 39500 PA, PE, PF, PP, PT
Before threading machine; unlock presser foot release bushing, swing presser
arm and cloth plate out of position and pull uppe r looper thread tube up. Turn hand-
wheel in operating direction until needle is at highest position. Thread tweezers
No . 660-240 are furnished with machine to aid in threading.
Thread machine in sequence as shown; (1) lower looper thread, (2) upper looper
thread, (3) needle thread.
THREADING DIAGRAM STYLE 39500 PW
Before threading machine; unlock presser foot release bushing, swing presser
arm and cloth plate out of position and pull upper looper thread tube up. Turn hand-
wheel in operating direction until needles are at highest position. Thread tweezers
No. 660-240 are furnished with machine to aid in threading.
Thread machine in sequence as shown; (1) lower looper thread, (2) upper looper
thread, (3)
right needle thread and (4) left needle thread.
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ROUTE THREAD THRU
TENSION POST SLOT
TURN TO RELEASE
PRESSER ARM
ROUTE LOOPER THREAD
IN FRONT OF LOOPER
THREAD PULL-OFF
·· · ~.
"'-- · · "~
SWING PRESSER ARM OUT ~\,~ .. A
~··~
~ .. ~
5
Fig. 1
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TURN TO RELEASE
PRESSER ARM - ---.ll"!:j
6
Fig. 1A
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ADJUSTING INSTRUCTIONS CLASS 39500
NOTE: Instructions stating direction or location, such as right, left, front or rear
of machine, are given relative to operator's position at the machine. The
handwheel rotates clockwise, in operating direction; when viewed from the
right end of machine.
NEEDLES
EXAMINE NEEDLE AND/OR NEEDLES TO ASSURE PROPER
TYPE AND SIZE IS BEING USED. THE FOLLOWING
CHECKS RELATED TO NEEDLE(S) MUST BE MADE BE-
FORE ADJUSTING THE NEEDLE(S), LOOPERS OR NEED-
LE GUARDS. DISCARD AND REPLACE ANY DEFECTIVE
NEEDLE(S).
-Place a new needle of the same type and size
alongside the existing needle to check cur-
vature of needle blade
as shown {A, Fig. 2).
-
Apply the thumbnail test to check for blunt-
ness and/or
hooks on the tip of needle(s) as
shown (B, Fig. 2).
-
Check for any sharpness around eye and/or
grooves of needle(s).
For a quick check, pull
forth through the needle
eye as shown (C, Fig.
shred
and severe the thread.
Fig. 2
the thread
up and down, back and
2). If any sharpness exists, it will
-
Be sure needle(s) is all the way up in needle holder and positioned correctly with
the spot or
scarf to the rear as shown (D, Fig. 2).
Machines are sewn off and shipped from the factory with needle(s) listed in
chart per machine style:
Machine Sty le
39500 PA, PE, PF, PP, PT
39500 PW
Type and Size
154 GAS-075/029
154 GAS-090/036
The following chart lists additional needle types and sizes available for Class
39500 machines.
NEEDLE TYPE
154 GAS
154 GBS
DESCRIPTION
Round shank, round point, curved
blade, standard length, single
groove, struck groove, spotted,
chromium plated.
Same as 154 GAS except it has a
double groove.
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SIZES AVAILABLE
055/022, 065/025, 070/027,
075/029, 080/032, 090/036,
100/040, 110/044, 125/049,
140/054, 150/060
070/027, 075/029,
080/032
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NEEDLE TYPE
154 GES
154 GHS
154 GJS
154 GLS
DESCRIPTION
Same as 154 GAS except it has a
shorter blunt point.
Same as 154 GAS except it has a
ba 11 point.
Same as 154 GAS except it has a
tapered b
1ade.
Same as 154 GAS except it has a
ball eye.
SIZES AVAILABLE
055/022, 065/025, 070/027,
075/029, 080/032, 090/036,
100/040, 11 0/044, 125/049,
140/054, 150/060
065/025, 070/027, 075/029,
080/032, 090/036
055/022, 065/025, 070/027,
075/029, 080/032, 090/036,
100/040
070/027, 075/029, 080/032,
090/036, 100/040
To have needle orders promptly and accurately filled, an empty package, a sample
needle or type and size number should be forwarded. Use description on label. A
complete order
would read
11
1000 needles, Type 154 GAS, Size 075/029
11
•
Fig. 3
Fig. 4
NEEDLE REPLACEMENT
Rotate presser foot release bushing
counterclockwise
and swing presser foot to the
left. Turn handwheel in operating direction
until needle(s)
is at lowest position. Loosen
clamp nut using socket wrench No. 21388 AU
(A, Fig. 3), then remove needle(s).
Turn handwheel until needle holder (B)
is at highest position. Insert new needle(s)
all the way up in needle holder with spot or
scarf to the rear. Tighten clamp nut, swing
presser foot to the right and lock foot into
sewing position with presser foot release
bushing.
NEEDLE ALIGNMENT
Check:
Needle(s) must enter the center of needle
slot(s) (left to right) in throat plate, as
shown in Fig. 4. If adjustment is necessary,
remove fabric guard and looper thread pull-
off.
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Procedure:
Loosen needle driving arm clamp screw
(A, Fig. 5) and center needle(s) in needle
slot(s) of throat plate by adjusting needle
driving
arm (B) left to right as required.
Temporarily tighten
clamp sc.rew (A), then
proceed to needle height adjustment.
NEEDLE HEIGHT
Check:
Rotate handwheel in operating direction until
needle(s) is at highest position. The needle
height
measurement from point of needle(s) to
top of
throat plate must be 1/2 inch (12.7mm)
as shown in Fig. 5.
Procedure:
Fig. 5
Loosen clamp screw (A) and adjust needle driving arm (B) front to back as required to
obtain needle height
shown in Fig. 5, then tighten clamp screw (A) and replace looper
thread
pull-off.
PRIOR TO MAKING THE FOLLOWING ADJUSTMENT; REMOVE CLOTH PLATE, CHIP GUARD, UPPER KNIFE,
MAIN, DIFFERENTIAL AND CHAINING FEEDS. ON MACHINE STYLE 39500 PT REMOVE THE SHIRRING
BLADE ASSEMBLY.
CLOTH PLATE
Remove cloth plate {A, Fig. 6) by loosen-
ing screw
{B) and lifting upward with stud (C)
and screw (D) still assembled to plate.
Before replacing cloth plate, hold stud
(C) and tighten screw (D) only enough to re-
move end play, yet allowing cloth plate to
swing open when assembled. Assemble cloth
plate to machine by inserting stud (C) with
flat and
11
V
11
notch to the rear into hole of
machine bed. Tighten screw (B) to press
11
V
11
notch of stud (C) against screw (D).
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Fig. 6
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Fig. 7
left needle on Style 39500 PW.
Procedure:
LOWER LOOPER
Check:
PRIOR TO CHECKING LOOPER ADJUSTMENT; REMOVE
FRONT AND REAR NEEDLE GUARDS.
LOOPER GAUGE - With looper at extreme left
position, 1/8 inch (3.2mm) is the distance
between looper point and centerline of needle;
1/16 inch
(1.6mm) to left needle on Style
39500 PW, as shown in Fig. 7.
LOOPER CLEARANCE TO NEEDLE(S) - Turn handwheel
in operating direction so that looper travels
from the extreme left into scarf of needle or
Point of looper should touch but
NOT deflect needle(s).
PRIOR TO ADJUSTING LOOPER, POSITION UPPER LOOPER UP AND AWAY FROM LOWER LOOPER.
Gauge No. 21225-l/8 or 21225-1/16 should be used to properly set looper gauge.
Position lower looper
(A) to extreme right and loosen clamp nut (B). Then position
looper to extreme
left and set looper gauge by adjusting looper in or out of the loop-
er shaft to obtain l/8 inch (3.2mm) or 1/16 inch (1.6mm) for Style 39500 PW. Rotate
handwheel to position looper into scarf of needle or left needle on Style 39500 PW and
set looper point to touch but NOT deflect needle(s), then position looper to extreme
right and tighten clamp nut (C).
REAR NEEDLE GUARD
Remove spring from inside of lower knife
holder
{A, Fig. 8), then assemble knife holder
into
throat plate support block.
Replace rear needle guard (B) using screw
(C) with front edge of guard centered in slot
of knife holder as shown. Temporarily tighten
screw
(C) to hold guard in position, yet allow-
ing guard to
be adjusted.
Rotate
handwheel in operating direction
so lower looper (D) travels from the extreme
Fig. 8
left into scarf of needle(s). Set guarding
surface of guard (B) to touch but
NOT deflect
needle(s) while also setting guard as low as possible to prevent it from interfering
with needle thread as loop is being formed to rear of needle(s), then tighten screw
(C) securely.
Guard must NOT interfere with lower knife holder movement or contact lower
looper
at any point of travel.
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