Machine Maintenance q

8/13/2019 Machine Maintenance q

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D O U B L E N E E D L E L O C K S T I T C H M A C H I N E

MACHINE MAINTENANCE


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EQUIPMENTS NEEDED

Pie or cake panfor soaking partsin cleaning fluid

Screw driverLarge screw

driver

Small adjustablewrench

Hammer(optional)

Small oil can(clean) for

cleaning fluid

Cleaning brush(narrow, nylon)

Paring knife (orpocket knife)

Long needle orsmall crochet

hook


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CONTINUED.

Tweezers Cleaning clothsFabric to test

stitching

Can of sewingmachine oil

Tube of sewingmachinelubricant

Plastic wraps(household

type)

Rubber glovesMagnifying

glass (optional)Flashlight(optional)


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GENERAL CLEANING(Sheduled Maintenance)

Remove all the parts possible in order to cleanthe machine thoroughly.

If possible, remove the bobbin case to remove alllint and stray threads.

If the machine begins to run hard, it is a sign that dirt orlint has jammed inside a bearing. Continue running themachine and flushing with cleaning fluiduntil the dirtand gummed oil are washed from the bearing. When themachine runs easily again, tip the head and flush theparts underneath the machineall oil holes, bearing andplaces that rub against or within another. Continuerunning the machine by hand until it functions smoothly.


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Bobbin and Hook Area-

Lint is the primary offender in this area. Use a drybrush to clean out all lint. Remove any thread that maybe wound up around the hook shaft. Remove the hook

assembly for more complete cleaning. Place one dropof oil on the exterior perimeter of the hook and the

bobbin race to lubricate if after cleaning.


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Face Plate Area

The plate can be easily removed forcleaning of the needle-bar and presserfoot bar. First use a dry brush to clean

out all lint and other foreign material.A small piece of cloth with a littlesolvent on it can be used to clean theneedle-bar and presser bar of anygummy grease. After thoroughly

cleaning, place a drop of oil on eachshaft where it slides through thehousing. Oil all other moving parts

before replacing face plate.


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Hand wheel Area

To remove the clutch and hand wheel, loosen the smallscrew in the face of the locknut. Some makes will be

slightly different .The hand wheel should slide off theshaft easily .Clean the hand wheel, washer, and shaft.Lubricate the shaft with two drops of oil and place asmall amount of grease on all gears.

Do not plug the machine in until all thecleaning fluid is dry.


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OILING AND LUBRICATING THE MACHINE

Lubricating via oil cover

Tilt the machine bed. Remove the rubber cap(1).

Pour the oil into the oilcover(3) until the levelreaches the referenceline(4).

Replace the rubber cap. Return the machine head

to its original position.


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Lubricating via oil tank

Remove the rubber

cap(1). Pour oil until oil level

reaches the referenceline(4) of the oil gauge

window(3).

Replace the rubbercap(1).


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Allow the machine to stand overnight so excesscleaning fluid can evaporate before oiling andlubricating it.

Do not oil the tension discs, the hand wheelrelease or the belts and rubber rings on anymachine.

Pour a little oil in the designated holes, and on all

parts that rub against or within another. Run themachine by hand to distribute the oil into all the

bearings.


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CARE OF THE MOTOR

Lubricating the electric motor of your sewing machineaccording to the manufactures directions.

Several newer machines have electric motors with sealedbearings that never need oiling. One or two drops perbearing is sufficient; over-oiling may ruin the motor.

On a grease-fitted bearing, fill the grease cups once ayear.

Check to see that all electric connections to the motorcontrol and motor are tight. If the cord covering is not in

good condition, tape it with good quality electric tape orreplace the cord. The belt that connects the motor to the hand wheel

should have just enough tension to keep it from slipping.


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PREVENTIVE MAINTENANCE FOR DNLS

STITCH FORMING SYSTEM-

The sewing machine needle should be inspectedregularly during the day and replaced if there are

signs of wear or damage. Correct needle size should be used.

Correct needle-thread combination to be used.


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THREAD HANDLING SYSTEM- Check to make sure thread is being stored properly. Check to make sure the correct thread type and sizes are being

used. Thread stands are in proper condition and the top eyelets are

oriented properly. Optimum distance between the top of cone & top eyelet. Machine eyelets and guides are smooth and not grooved,

rusted or damaged. Proper thread tension. Bobbin winder in good condition & making correct wind on

bobbins. Condition of bobbins & bobbin tension


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FEED SYSTEM-

Needle Plates are in good condition.

Look for needle damage and sharp edges

Check to see if the needle plate is flat and not bent downat the needle hole.

Feed Dogs are in good condition and correct for theapplication.

Correct presser foot to be used.

Check presser foot for excessive wear causing side-to-side play.

Make sure that the presser foot is positioned properly.


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Thread Trimming System-

Check to see that the cutters are cutting the thread tothe proper length that minimizes trim & inspect.


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Typical Causes of machine Breakdown

Excessive friction between the parts (E.g. insufficient /improper / lack of lubrication)

Failure to replace parts that are known to wear Neglected cooling system

Neglected common minor faults (e.g. vibrations,temperature, metal fatigue) Temporary or permanent external factors (e.g.

overloading of MC, wrong fuel, obstruction of air intakes,faults in another item / equipment)

Design or manufacturing defects of the equipment Installation deficiencies Improper handling of the MC by operators


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Date post:	04-Jun-2018
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Machine Maintenance q

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