UnionSpecial 4500A User guide

ORIGINAL INSTRUCTION MANUAL,
MAINTENANCE BOOKLET AND ILLUSTRATED PARTS LIST
CATALOG NO. : PT1704-GR-EN
FOR STYLES : 4500A, 4500B
STYLES 4500A, 4500B
PORTABLE BAG CLOSING MACHINE
03/2022

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CATALOG NO. PT1704-GR-EN
INSTRUCTION MANUAL FOR
4500A, 4500B
PREFACE
First Edition ©2022
Union Special GmbH Rights reserved in all Countries
This manual assists you in the operation and maintenance of your machine and simplies spares orders.
It explains the proper settings for operation of the machine. Illustrations show the adjustments and reference
letters point out specic items discussed.
Important information on how to operate the machine safely, properly and e󰀩ciently are given. Observing
these instructions prevent accidents, reduce repair and downtimes and increase reliability and life cycle of
the machine.
This manual has been comprised on available information. Changes and improvements in design may slight-
ly modify the conguration of illustrations or caution notes.
Hereinafter you shall nd illustrations and descriptions of the instructions and of the components of your
machine.
The instruction manual must always be available wherever the machine is in use.
The manual has to be read and applied by any operator charged with the task of
• operation, including setting, troubleshooting and care
• maintenance (service, inspection and repair)
and/or
• transportation.
In addition to all mandatory rules and regulations in the country of use and on site for the prevention of acci-
dents and the protection of the environment the recognized technical safety rules are applicable.
Subject to change without notice

4
SAFETY RULES
General Caution notice:
Before putting the machine described in this manual into service, carefully read the instructions.
Omission of taking note of the safety rules and instructions may lead to electric shock, re or severe inju-
ries. The sewing machine may only be operated by qualied operators. Observe the national safety regula-
tions valid for your country.
Keep the safety rules and instructions handy for future use.
The term “portable bag closer” relates to cable-operated portable bag sewing and bag closing machines
(with power cord) or accumulator-operated portable bag sewing and closing machines (without power cord).
1. Safety on site
a) Keep your workplace clean and well-lit. Chaos and poorly-lit workplaces may lead to accidents.
b) Do not operate the machine in an explosive surrounding, near inamable liquids, gas or dust.
Sewing machines generate sparks which may ignite dust and fumes.
c) Keep children and other persons apart while operating the sewing machine. If distracted, you may
lose control over the machine.
2. Electric safety rules
a) The electric plug has to t in the socket. The plug may not be altered. Do not operate any adapt-
ers with protecting grounding electric tools. Original plugs and tting sockets reduce the risk of
electric shock.
b) Avoid any contact with grounded surfaces such as pipes, radiators, etc. You are at an increased
risk for electric shock if your body is grounded.
c) Keep the sewing machine away from rain and humidity. The presence water inside the electric tool
increases the risk for an electric shock.
d) Do not use the cable in an unforeseen manner to carry, suspend or pull the plug from the sock-
et. Keep away from heat, oil, sharp edges or moving parts of the machine. Damaged or curled up
cables increase the risk for electric shock.
e) When operating the machine outside only use suitable cable extensions. Using a suitable cable
extension reduces the risk of electric shock.
f) In case you have to operate the machine outside, use an earth-leakage circuit breaker. Application
of an earth-leakage circuit breaker reduces the risk of an electric shock.
g) Working on live components and installations are prohibited. For exceptions refer to the relevant
chapters of DIN EN 50 110 / VDE 0105.
3. Safety rules for personnel
a) Be cautious, take care of what you are doing and use your good sense in operating the machine.
Do not operate the machine when tired or under the inuence of drugs, alcohol or medication.
One moment of inattention while operating the machine can lead to serious injuries.
b) Wear your personal safety gear and always protective glasses. Wearing personal safety gear such
as dust mask, non-slippery safety shoes, protective helmet and ear protectors reduces the risk for inju-
ries depending on the kind of operation performed with the machine.

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c) Avoid accidental operation of the machine. Make sure the machine is switched o󰀨 before con-
necting the mains and/or the accumulator, picking up or carrying the machine. If your nger is on
the switch while connecting the mains this may lead to accidents.
d) Avoid unusual positions. Make sure you are standing secure and always keep your balance. It
makes it easier to control the sewing machine in unexpected situations.
e) Wear suitable clothes. Do not wear wide clothing or jewellery. Keep hair, clothes and gloves away
from moving parts. Loose clothes, jewellery and long hair may be caught in moving parts.
4. Application and handling the sewing machine
a) Do not operate the sewing machine above capacity:
S3 40%.
Duty: S3: 40% according to ISO 34-1/DIN VDE 0530.
The relative operation duration may not exceed a duration of 40%, related to a cycle of 10 minutes.
b) Do not operated a sewing machine with a defective switch. A sewing machine which cannot be
switched on or o󰀨 is dangerous and has to be repaired.
c) Disconnect the mains resp. disconnect the pressure supply and/or remove the accumulator be-
fore performing maintenance, i.e. threading needle and looper, exchangeing sewing tools, such as
needle, presser foot, throat plate, looper, feed dog, needle guard, folder, guide etc. or at the end of
operation. These preventive measures protect you against involontarily starting the sewing machine.
d) Store inattended sewing machines out of reach of children. Do not allow unskilled persons to
operate the sewing machine, who have not read the instructions. Sewing machines are dangerous,
when operated by inexperienced persons.
e) Take good care of the sewing machine. Check the function of moving parts by turning the
handwheel, check for jammed, broken or damaged parts interfering with the working condition of
the machine. Have the damaged parts repaired before operating the machine. Many accidents are
caused by poorly maintenanced machines.
f) Keep the thread chain cutter sharp and clean. Diligently maintenanced knives with sharp cutting edges
jam less and cut longer.
g) Apply the sewing machine according to these instructions. Consider the working conditions and
the work to be performed. The use of the sewing machine for other operations than the intended use
may lead to dangerous situations.
h) On operational and on machines in operation all safety gadgets have to be in place. Operating the ma-
chine without the relevant safety measures is prohibited.
i) Modications and changes on the machine may only be performed observing the valid safety in-
structions. Modications and alterations are performed at your own risk.
k) Before e󰀨ecting maintenance and repair on the pneumatic components the machine has to be
disconnected from the pressure supply. If the machine is still under pressure after disconnecting the
pressure tank, the machine has to be bled. Exceptions are only permissible for skilled personnel when
performing adjustments and function tests.

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TABLE OF CONTENTS
Preface.... ........................................................................................................................................................3
Safety Rules.... ................................................................................................................................................4
Machine Description........................................................................................................................................8
Starting up the Machine...................................................................................................................................9
Preparation for Operation................................................................................................................................9
Sewing Operation..........................................................................................................................................10
Adjustments................................................................................................................................................... 11
Exchange or Adjustment of Ball Rod.............................................................................................................12
Lubricator.......................................................................................................................................................13
Trouble Shooting.... .......................................................................................................................................13
Maintenance..................................................................................................................................................14
Cleaning.... ....................................................................................................................................................14
Transportation And Storage...........................................................................................................................14
Safety Rules for Use......................................................................................................................................14
Trouble Shooting.... .......................................................................................................................................15
Ordering Wear and Spare Parts....................................................................................................................16
Views and Description of Parts......................................................................................................................17
Numerical Index.............................................................................................................................................34

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MACHINE DESCRIPTION
Portable bag closing machine
Portable bag closing machine with electric motor and thread chain cutter. For closing lled bags and sacks
made of jute, burlap, cotton, linen, paper, plastic etc. with single thread chain stitch (stitch type 101).
Technical Data:
Stitch type and seam spec.: 101 SSa-1
Sewing speed max. 1600-1800RPM, depending on material and thickness
Feed Plain feed
Stitch length: 8.5 mm
Sewing capacity: up to 6.5 mm thickness or 12 plies of paper
Needle: DNX1- 25-200/080
Motor: 220V (65W), 230-240V ((70W)
Electric supply: 220V AC (Power: 65 W)
230V - 240V AC (Power: 70 W)
50-60Hz Single phase
Dimension: 361 x 246 x 321 mm
Weight: 6 kg net / 7 kg gross, including one cone of thread
Packed dimension: 370 x 280 x 400 mm
Available Styles:
4500A with motor for 220-240 Volt / 50-60 Hz,
with earthing conductor (protection class 1)
4500B with motor for 110-125 Volts / 50-60 Hz,
with earthing conductor (protection class I).
Sound emission:
Sound pressure level at a maximum operating speed of 1800 RPM (LpAd): 79-81dB (A), measurement
according to DIN EN 11201.
Every UNION SPECIAL sewing machine has a type number and a serial number on the reverse.
Both numbers are stamped into the machine plate.
Needles
Each needle has both a type and size number. The type number denotes the kind of shank, point, length,
groove, nish and other details. The size number, stamped on the needle shank, denotes largest diameter
of blade, measured midway between shank and eye. Collectively, type and size number represent the com-
plete symbol, which is marked on the label of all needles packages and sold by UNION SPECIAL.
Recommended needle type is DNX1-25-200/080. It has a round shank, square point, double groove, spot-
ted, is chromium plated and is available in size - 200/080.
Selection of proper needle size is determined by size of the thread used. Thread should pass freely
through the needle eye in order to produce a good stitch formation.
To have needle orders promptly and accurately lled, an empty package,a sample needle or the type and
size number should be forwarded. Use the description on the label. A complete order would read: “100 Nee-
dles, Type DNX1-25-200/080”.

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INSTRUCTIONS
STARTING UP THE MACHINE
Before leaving our premises each machine is carefully checked, adjusted and function tested. However, it
is recommended to check the machine upon arrival and all damages or complaints directly led with Union
Special or our representatives. Unpack the machine. Make sure not packaging material is caught in the
mechanism. Check the voltage of the three-phase motor against the voltage of your electric supply and
socket. Sockets for machines with protective circuit breaker require correct earth grounding. Connect the
plug into the socket.
PREPARATION FOR OPERATION
1. OILING (FIG. 1)
Oiling is imperative to keeping the machine in good operating con-
dition. Pour oil in the reservoir (capacity 45 cc). To begin the oil
ow to the machine push button of the lubricator ten times contin-
uously before starting the machine. This should dispense enough
oil for an average running of four hours under normal operating
conditions. Do not run the machine without oil as this causes ma-
chine failure or breakdown.
2. NEEDLE SETTING (FIG. 2, 3, 4)
Turn the pulley until Needle Bar reaches its highest position.
Loosen Needle Bar Clamping Nut and set Needle in the Bar as
deep as it will go.
Be sure to set a Needle with its concave part facing correctly to-
ward the Looper. Fix Clamping Nut tightly, otherwise Needle may
come loose during operation and break.
3. THREADING (FIG. 5)
The machine is delivered being threaded to show you the proper
threading of the machine, which is shown in Fig. 5, for identica-
tion. Follow the guide numbers 1 to 7 of Fig. 5.
1. / 2. Thread Eyelet
3. Tension disc
4. Thread Eyelet
5. Needle Bar
6. Thread Eyelet
7. Needle

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SEWING OPERATION
Before starting, make sure that the supply voltage accords with the specication of the motor.
Hold the machine in your right hand and place your index nger on the switch button on the handle (Fig. 6).
Hold the bag in your left lightly and insert the bag mouth between Feed Dog and Presser Foot (Fig. 7).
Run the machine while keeping the bag straight. Never pull or pull back the bag.
After closing, the thread is cut by the built-in nibbler type cutter.
When cutting the thread, leave at least 3 cm extended tail to prevent the unwilling loosening of the seam
(Fig. 9).
Run the machine with empty bags and make sure you are well versed in it operation before entering into
actual production.
UNION SPECIAL

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ADJUSTMENTS
CAUTION: When adjusting the machine or replacing parts, always disconnect the Electric Cord
from the power source. This is crutial for the safety of the operator and the adjuster.
1. Thread Tension (Fig. 10)
The thread tension spring is preset at the factory to sew
PP woven cloth bags. If adjustment is required, rst loos-
en screw (A) No. 450106 and adjust the thread tension
nut (B) No. 450105 as per Fig. 10. When the adjustment
is nished, retighten screw to lock the thread tension nut.
If this is not done, the stitch will not remain uniform.
2. Position of Needle and Looper (Fig. 11)
Looper must pass the concave part of Needle with
clearance of 0.1 mm as shown in Fig. 11. Adjustment of
the clearance can be done after loosening the screw of
Looper Rocker.
3. Position of Feed Dog (Fig. 12)
When installing a new feed dog ensure that it is posi-
tioned correctly onto the feed dog carrier block and light-
ly tighten the xing screw. Check that the feed dog teeth
are 2.5-3.5 mm above the throat plate when the feed
dog is in the top dead center before nally tightening the
xing screw.
4. Pressure of Presser Foot
When adjusting the presser foot pressure, take out
the Needle Bar Guard and loosen Screw of Presser
Bar Connection. Raise the Presser Bar to increase the
pressure and lower to decrease the pressure. After the
adjustment, tighten the Screw rmly.
5. Presser Foot Lifter
The Presser Foot Lifter is used to lift the Presser Foot
and pull out the bag from under the Presser Foot in case
of a problem such as bag or thread jamming.
6. How to use the Hook
The Hook on the Pulley Cover is used to install a Shoul-
der Belt or a Hanger.
2.5-3.5mm

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EXCHANGE OR ADJUSTMENT OF BALL ROD
Exchange or Readjustment of Ball Rod (Fig. 13)
Remove Screw (1) and disconnect Rod End (2) from
Needle Bar Lever (3).
After loosening the Nut (4), adjust the clearance
between Connecting Rod (5) and Rod End (2) so
the Needle Bar moves to the center of the clearance
between the upper and lower Presser Bar Bushings.
The movement is 37 mm.
To x Eccentric Cam (7) on Main Shaft (8), tighten the
Screws (9) and (9’) on the Main Shaft (8) (Eccentric
Cam (7) should contact Spacer (10) slightly).
After loosening the screw on the Needle Bar Connect-
ing Assembly (6) (Fig. 13) the position of the Needle
is adjusted to 13 mm from the point of the Needle (in
its upper dead center) and the Throat Plate. Retighten
screw (6).
Adjust Looper Drive Cam (Fig. 14)
a) Apply the Screws(2) and (2’) on the taper of the
Main Shaft (1).
b) Adjust Arm (B) (4) to allow a smooth movement of
Looper Drive Cam (3) and Arm (A) (5). Retighten
Screw (6) tightly after adjustment.
c) The clearance between Looper Drive Cam (3) and
Arm (5) is e󰀨ected by Spring (7). Loosen Screw
(9) and turn Spring Supporter (8) to adjust the
pressure of Spring (7).
After adjustment tighten the Screw (9) to fasten Spring
Supporter (8).

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LUBRICATOR
OPERATION
The lubricator comprises a pump and a reservoir.
The reservoir holds max 45 cc of oil (e󰀨ective oil
volume is 28 cc).
Use mineral oil 22-32 cSt at 40°C (Eg. Tellus oil
No.32).
To operate the lubricator:
1. First unscrew the reservoir cap by half a turn. Do
not remove the cap completely.*
2. Push the button to its lowest position (stroke: 12
mm).
3. When released, the button will automatically re-
turn to its original position.
4. Lastly, tighten the cap to prevent oil leakage dur-
ing operation.
MAINTENANCE
1. Keep o󰀨 dust or foreign matter when lling reser-
voir (may cause jamming of piston and check the
valve).
2. Rate of discharge is xed and not adjustable
(0.08cc per push).
3. At high temperatures, grease may run along
points (A). This is normal grease used during
assembly of lubricator in our plant.
4. Keep oil reservoir (high density polyehylene)
away from re and do not use organic, benzene
or xylene chemicals for cleaning.
Regularly check the correct function of the oil
pump (Repeat oil feed and check oil through the
discharge pipe).
TROUBLE SHOOTING
PROBLEM CAUSE REMEDY
================================================================================
Oil not fed Low oil level Fill oil
================================================================================
Full stroke movement not obtain-
able
Dust attached on the interior of the pump
chamber
Replace lubricator
================================================================================
Button will not return Dust accumulated or break of spring Replace lubricator
================================================================================
Oil leak from (A) Wornout or displaced seal of O-Ring Replace lubricator
================================================================================
Oil leak from (B) Wornout or displaced seal of Plug Replace lubricator
================================================================================
Oil leak from (C) Loose plug Tighten Plug or replace
lubricator

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MAINTENANCE
It is mandatory to check the function and safety devices on the machine once a day.
CLEANING
It is recommended to clean the machine after every shift or end of days work. Clean the teeth of the feed
dog, the looper and the stitch hole in the throat plate of dust and foreign matter. Also lubricate all movable
parts which are not lubricated by the oil mechanism.
CAUTION: The Motor should not be opened for maintenance or cleaning!
When adjusting the machine or replacing parts, always disconnect the electric cord
from the power source!
TRANSPORTATION AND STORAGE
1. The machine should alway be transported in a carton.
2. When the operation is completed, disconnect the machine from the electric power supply. If the ma-
chine is stored for some time, it should be carefully cleaned and stored in its carton.
3. Never store or keep in a humid or very warm surrounding.
SAFETY RULES FOR USE
When used in another way than foreseen the machine can represent a hazard. The following rules are
mandatory:
1. The machine is foreseen for your right hand use. Always keep a distance of 15 cm to your left hand
directing the bag and the machine.
2. Never touch the moving parts of the machine such as needle bar or needle while the machine is in
operation. When threading the machine or replacing the needle always disconnect the electric power
supply.
3. Foreign matter such as your hair or clothes have to be kept well away from the machine, particularly
when the motor is running.

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TROUBLE SHOOTING
PROBLEM REMEDY
1. Stitch too loose A) Check the thread tension.
B) Check the sharpness of the feed dog and throat plate teeth.
2. Stitch too short A) Check the sharpness of the feed dog and throat plate teeth.
3. Bag tears on the seam A) Make sure you support the feeding of the machine by hand
when the bag is sewn. The sewing machine has to move at the
same speed over the bag top as the feed dog is feeding the
bag.
B) In case the bag is placed on a conveyor, adjust the speed of
the conveyor to the sewing machine.
C) Check the pressure on the presser foot.
D) Has the bag material been changed and the sewing machine
readjusted to this material?
4. The machine is no longer running A) Is the machine securely connected to the power supply?
B) Check the electric cable for breaks.
C) If the switch button does not click, replace the switch.
D) Check the motor brushes and replace them if too short.
NOTE: Repair on electric components has to be e󰀨ected by
authorized and skilled personnel!
5. Thread breaks A) Does the thread feed easily from the cone?
B) Check the thread tension.
C) Check the thread guides for lint.
D) The needle is hot.
6. Skip stitches or missing chaining A) Check thread tension.
at the end of the bag
B) Make sure the thread guides are free and the thread is running
smoothly.
C) Is the thread running smoothly from the cone?
D) Check the feed dog teeth and throat plate teeth and replace if
dull.
E) Check if the needle is loose or misaligned.
F) Check if the looper is loose, worn or needs to be reset.
G) Make sure the machine is correctly threaded.
7. Needle breakage A) Check the looper and needle alignment.
B) Check the needle alignment in relation to the throat plate and
needle setting.

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ORDERING WEAR AND SPARE PARTS
The following section of this manual simplies ordering spare parts. Exploded views of various sections of
the mechanism show the actual position of the spares in the machine. On the left page the exploded views of
the parts are located, on the right page are the lists of parts with part numbers, descriptions and the quantity
required.
Numbers in the rst column are reference numbers only, and merely indicate the position of the respective
part in the illustration. Reference numbers should never be used in parts orders. Always indicate the part
number listed in the second column.
Individual parts from complete sets of parts which can be delivered as spares are enumerated below the
complete set number and indented for your guidance.
At the back of the manual a numerical index of all parts shown in this manual can be found. This facilitates
locating the illustration and description when only the part number is available.
IMPORTANT! ON ALL ORDERS PLEASE INDICATE PART NUMBER, PART DESCRIPTION,
QUANTITY RE-QUIRED AND RELEVANT STYLE OF MACHINE FOR WHICH THE PARTS
ARE ORDERED.

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VIEWS AND DESCRIPTION OF PARTS

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THREAD TENSION AND COVERS
1. THREAD TENSION AND COVER PARTS

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Pos. No. Part No. Description Quantity
1 4501001 Thread stand 1
1-1 4501001-1 Main frame 1
2 4501002 Screw 2
3 4501641 Winged nut 1
4 4501634 Thread cone clamping rod 1
5 Z1-204-250WS Thread 1
6 4501006 Top cover 1
7 4501007 Screw 2
8 4501008 Thread eyelet 1
9 4501009 Screw 1
10 4501010 Thread tension eyelet 1
11 4501011 Thread tension assembly 1
12 4501012 Tension post 1
13 4501013 Tension disc 2
14 4501014 Tension spring 1
14-1 4501014-1 Washer 1
15 4501015 Tension nut 2
16 4501016 Screw 1
17 4501017 Needle guard 1
17-1 4501017-1 Needle bar guard for „CE“-Type 1
18 4501009 Screw 1
19 4501023 Screw 2
20 4501020 Looper cover 1
21 4501019 Screw 2
22 4501022 Slide plate 1
23 4501023 Screw 3
24 4501024 Gasket 1
25 4501025 Inside cover 1
26 4501023 Screw 4
27 4501027 Name plate 1
THREAD TENSION AND COVERS

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BUSHINGS, OIL PUMP AND HANDLE