2i refurbishing - the underside

INTRODUCTION

Apart from the usual cleaningand oiling, there are four tasks tobe done under the base:

Checking the Rollers

Most important: Every time thefeed dog is raised, the roller slidesin a channel. If the roller does notrotate, it wears itself and thechannel.

Replacing the Feed Dog and checking the height

It is important to set the FeedDog height as accurately aspossible.

Too little and the Feed Dogdisappears back under the coverplate before any long stitchlengths can be obtained, toomuch and the pressure foot tendsto bounce and loses control ofthe fabric.

Checking the Stitch Length

Checking for excessive play in the connecting arms.

Each machine is dealt with inturn, apart from this last item.

This task is so similar for eachmodel that it is dealt with as acommon task at the end of theUnderside section.

The underside of the machinecollects a lot of dirt, fluff andsurplus oil during its lifetime.Out of sight, out of mindperhaps.

Brush out all fluff and wipe all theconnecting rods with cloth orpaper towel to remove grease anddirt. Use a scouring pad on verydirty parts.

Checking the Rollers

(1) Turn the machine up so it isresting on the head end.Undo the screw holding thefeed dog lifting arm in place.

(2) Pull the arm out to the left.

If the arm is difficult to remove,turn the balance wheel whilepulling on the arm.

(3) Check that the roller on thearm turns easily. If not,apply penetrating oil andleave. Then grip with pliers and loosen. Continue untilthe roller moves easily.

Wipe off any penetrating oil andapply a drop of oil at each end ofthe roller. Check the other rolleron the feed dog control arm.

If the roller is stuck, you mayhave to remove the hook ring linkto use pliers on the roller.

(4) Remove the screw in picture and the link can be lifted off.

Turn the balance wheel until thefeed dog control arm can be liftedup through the gap in the linkage.

(5) The roller can then be freed as the other.

Replace the link if you have hadto remove it. (Refer to picture (4)to get it the right way round).Tighten its screw.

Return the feed dog lifting arm byreversing the actions to remove it.

Checking the Feed Dog Height

(6)Replace the feed dog, with itsholding screw just tight.

UNDERSIDE 66/99

[2] I - 1

25.3.2006

2 2

66/99

1

2

3

4

5

6

1

2

3

4

(7) Before you replace the halfround cover plate clean outany debris from the edge ofthe depression into which itfits with a small screwdriver.

An accumulation of debris canmove the plate over slightly whenit is replaced. Replace the coverplate and check that the feed dogcomes up through it withouttouching either side. If this is aproblem see the AdvancedTechniques section later in thismanual or note for Netley Marsh.

The points on the teeth of theFeed Dog (at the maximumprojection above the cover plate)should be set at an optimumheight of around 3/64ths of aninch. This equates to 50 thou-sands of an inch.

You could use feeler gauges tomake up close to this. Alternatively,set the height to a whisper underthe thickness of a 5p coin.

Set the stitch length to maximumand turn the balance wheel untilyou judge that the feed dog hasreached its maximum height.

(8) Lay any guide you have alongside the feed dog. The tip of the teeth should be just level with the top of the guide.

Adjust by loosening the feed dogscrew, raising or lowering thefeed dog and retesting.

Note: Always test with themachine in its normal horizontalposition and push down on thefeed dog to make sure it is fullydown before you test.

Tighten the feed dog screw firmly.


Now is a good time to check this.With the stitch length control setto maximum, turn the balancewheel and check that the feeddog traverses the slot in the coverplate for almost all of its length.

If it is set shorter than this, do thefollowing:

(9) Lay the machine on its side,hinge side down, and locate the link from the top of the machine to the long connecting rod.

Loosen the nut on this linkage. A3/8 AF ring spanner is best. Youmay need to hold the bolt firmlywith a screwdriver to stop itturning while you do this.

There is no need to remove thenut completely - just loosen itenough to allow the bolt to beturned.

The bolt is an eccentric. You willsee that it changes the position ofthe feed dog as it is turned.

Turn the balance wheel until thefeed dog is at the end of its travel.

Turn the stitch control bolt withthe screwdriver until the feed dogapproaches the end of the slot inthe cover plate.

Turn the balance wheel for a fullstitch cycle to make sure that youhave not overdone your adjust-ment which can cause the feeddog to catch on the bedplate.

(10) If all is well, re-tighten the nut while holding the bolt still with the screwdriver.

Continued Overleaf

UNDERSIDE 66/9925.3.2006

[2] I - 2

2 2

8

9

10

7

OILING

This picture shows the under-neath oiling points.

With the machine resting in thisposition, put a drop of oil in eachplace marked with an arrow.Some of these points are pivots,others are oiling holes. Makesure all the oiling holes are clearof debris.

Specifically these are:

The bearings at the end of thetop connecting rod, and the feeddog arm.

The joints at each end of thebottom arm.

In the inset picture, the oilingholes in the linkage arm, the postholding the hook ring arm, andthe bottom cam into which theroller fits.

(This oiling hole can only be seenwhen the mechanism is in theinset position).

Run the machine for a fewrevolutions to work the oil intothe bearings before turning themachine upright.

25.3.2006

[2] I - 3

UNDERSIDE 66/992 2

Lay the machine on its back i.e.with the hinge points on thetable. Brush out all fluff and wipeall the connecting rods with clothor paper towel or - in bad cases -a scouring pad. to remove greaseand dirt.

Checking the Roller

The 15K has only one roller. It ison a fitting connected to the longconnecting rod at the front of themachine.

The roller is difficult to see anddifficult to detect whether it isturning. If in any doubt, you mustmake sure, as otherwise themachine will wear unnecessarily.

(1) Loosen the screw on theroller arm.

(2) Use a nail punch and ahammer to gently tap the fitting to the right.

You can now test the roller formovement.

(3) If still stuck, rotate thefitting towards you, oil bothends of the roller, and grip itwith pliers to loosen it.

Replace the fitting by rotating itback, and sliding the fitting backalong the shaft until the yoke onthe feed dog arm is in the middleof the roller.

This operation will have upsetthe height of the feed dog, so donot re-tighten the screw at thisstage.

Checking the Feed Dog Height

Replace the feed dog - if youremoved it for cleaning.

(4) Before you replace the half round cover plate clean out any debris from the edge of the depression into which it fits with a small screwdriver.

An accumulation can move theplate over slightly when it isreplaced. Replace the cover plateand check that the feed dogcomes up through it withouttouching either side.

If this is a problem see AdvancedTechniques later in this manualor note for Netley Marsh.




(5) Lay your gauge alongside theteeth of the feed dog andcheck the height.

If you need to adjust the height,loosen the feed dog screw. (Youmay have already done so check-ing the roller.) See picture (1).

Rotate the fitting until the feeddog is at the right height. Re-tighten the screw.


Now is a good time to check this.With the stitch length control setto maximum, turn the balancewheel and check that the feeddog traverses the slot in the coverplate for almost all of its length.

UNDERSIDE 15K

[2] I - 4

25.3.2006

2 2

1

2

3

4

5

screw

Roller Fitting

StitchLength

Adjustment


Lay the machine on its side,hinge side down, and locate thelink from the top of the machineto the long connecting rod. At thebottom of the machine.

(6) Loosen the nut on this linkage

A 3/8 AF ring spanner is best.You may need to hold the boltfirmly with a screwdriver to stopit turning while you do this.There is no need to remove thenut completely - just enough toallow the bolt to be turned.

The bolt is an eccentric. You willsee that it changes the position ofthe feed dog as it is turned. Turnthe balance wheel until the feeddog is at the end of its travel.

Turn the stitch control bolt withthe screwdriver until the feed dogapproaches the end of the slot inthe cover plate.

Turn the balance wheel for a fullstitch cycle to make sure that youhave not overdone your adjust-ment which can cause the feeddog to catch on the bedplate.

If all is well, re-tighten the nutwhile holding the bolt still withthe screwdriver.

Turn the balance wheel over afew times to make sure themachine is moving freely.

OILING

This picture below shows theunderneath oiling points.

With the machine resting in thisposition, put a drop of oil in eachplace marked with an arrow.

Some of these points are pivots,others are oiling holes. Make sureall the oiling holes are clear ofdebris.

UNDERSIDE 15K25.3.2006

[2] I - 5

2 2

6

(1) Lay the machine on its backi.e. with the hinge points onthe table.

The covers have been removedfrom the gears in this illustration.

The shallow cover under thehook ring area collects dust andfluff. Remove it to clean.

Normally the other gear coverneed not be removed. Brush outall fluff elsewhere and wipe allthe connecting rods with cloth orpaper towel or - in bad cases - ascouring pad to remove greaseand dirt.

Checking the Roller

The 201 has only one roller. It ison a fitting connected to the longconnecting rod at the front of themachine. (See picture (1))

(2) This fitting allows the user tokeep the feed dog below thecover plate when doing freeform work - embroidery ordarning for instance.

By unscrewing the knob, theroller part of the fitting will swivel.

Refix the screw and the feed dogarm will be held down.

Because this feature is seldomused, the knob can be difficult toturn. If you fail with ascrewdriver, use pliers and add acouple of drops of oil as soon asyou have a crack between theknob and its fitting. Onlyunscrew the knob sufficiently torelease the bracket holding theroller.

(3) This picture shows the settingfor normal sewing...

(4) In this one the machine is setfor free form work.

The roller is easier to see - and todetect whether it is turning - inthis setting. If in any doubt, youmust make sure, as otherwise themachine will wear unnecessarily.

(5) Loosen the screw on theroller arm and push it to theright. If necessary, use a nailpunch and a hammer togently tap the fitting over.

It is now easier to test the rollerand to grip it with snipe nosedpliers to free it.

If still stuck, the roller bracket canbe removed. Rotate the fittingtowards you so that the screwholding the bracket in place canbe undone. (It is normallyobstructed by the feed dog arm).

With a little wriggling, the bracketcan be removed. Replace thebracket when the roller has beenfreed and oiled.

Replace the fitting by rotating itback, and sliding the fitting backalong the shaft until the yoke onthe feed dog arm is in the middleof the roller.

This operation will have upsetthe height of the feed dog, so donot re-tighten the screw at thisstage.

Checking the Feed Dog height

Replace the feed dog - if youremoved it for cleaning.

UNDERSIDE 201

[2] I - 6

25.3.2006

2 2

1

2

3

5

6

4

(6) Before you replace the half round cover plate it is worth cleaning out any debris from the edge of the depression into which it fits with a smallscrewdriver.

An accumulation can move theplate over slightly when it isreplaced.

Replace the cover plate andcheck that the feed dog comes upthrough it without touchingeither side. If this is a problem seeAdvanced Techniques later inthis manual or note for NetleyMarsh.




(7) Lay your gauge alongside the teeth of the feed dog and check the height.

If you need to adjust the height,loosen the feed dog screw. (Youmay have already done so check-ing the roller - see picture (5)).

Rotate the fitting until the feeddog is at the right height.

Re-tighten the screw.


Now is a good time to check this.

With the stitch length control setto maximum, turn the balancewheel and check that the feeddog traverses the slot in the coverplate for almost all of its length.


Lay the machine on its side,hinge side down, and locate thelink from the top of the machineto the long connecting rod at thebottom of the machine.

(8) Loosen the nut on this linkage. A 3/8 AF ring spanner is best. You may need to hold the bolt firmly with a screwdriver to stop it turning while you do this.

There is no need to remove thenut - just loosen enough to allowthe bolt to be turned.

The bolt is an eccentric. You willsee that it changes the position ofthe feed dog as it is turned.

Turn the balance wheel until thefeed dog is at the end of its travel.Now turn the stitch control boltwith the screwdriver until thefeed dog approaches the end ofthe slot in the cover plate.

Turn the balance wheel for a fullstitch cycle to make sure that youhave not overdone youradjustment which can cause thefeed dog to catch on thebedplate.

If all is well, re-tighten the nutwhile holding the bolt still withthe screwdriver.

Turn the balance wheel over afew times to make sure themachine is moving freely.

Continued Overleaf

UNDERSIDE 20125.3.2006

[2] I - 7

2 2

7

8

OILING

The main picture shows theunderneath oiling points.

With the machine resting in thisposition, put a drop of oil in eachplace marked with an arrow,except A.

Some of these points are pivots,others are oiling holes. Makesure all the oiling holes are clearof debris.

Turn the balance wheel a fewtimes to circulate the oil.

To oil point A, bring the machineback upright and put a couple ofdrops of oil in the hole which isvisible about halfway up thehook ring casing. This oils thegear wheels below.

(9) To oil the gear wheels at theother end of the machine, put acouple of drops of oil into thehole on the main pillar, shownin the adjacent picture.

[2] I - 8

9

UNDERSIDE 20125.3.2006

2 2

CONNECTING RODS & PIVOTS

(1) Pivots are used for connectingrod bearings on all machines,similar to that shown abve.

It consists of a screw with aconical pointed end, whichlocates into an opposite shapedfitting on the end of theconnecting bar.

(2) The screw is held in bracketson the bedplate of the machine,the end of the screw and thelocknut being visible at the sideof the bracket.

(3) Older machines use pivotswithout threads and locknuts.These are held in place withscrews located on the end of thebrackets.

(3) Check that, when holding the connecting rod, it has the minimum movement from left to right. If there is discernible movement, itneeds adjusting.

PLAIN TYPE

(4) Undo the fixing screw.Gently tap the end of the pivot with a nail punch to move it towards the connecting rod.

Check the amount of movement.There should be the barest traceof freedom. Too tight and themachine will run hard. Tightenthe screw when adjusted to yoursatisfaction.

SCREW TYPE

(5) Use a 9/16th AF ring spannerto undo the locking nut. Thescrew can now be turnedinwards with a screwdriver.

Test the amount of movement asfor the plain type.

(6) Hold the screw firmly inplace while you tighten thelocknut with a spanner.

ADJUSTABLE CONNECTIONS

(6) You will see this type of fittingon some connections under thebed and in the head.

The purpose is to take up anywear which may occur in thebearing by tightening the screw,which decreases the gap visiblein the picture.

If you feel this is necessary, bevery careful not to overdo it, as itcan make the machine veryheavy to turn.

UNDERSIDE PIVOTS (All Machines)

[2] I - 9

25.3.2006

2 2

1

2

3

5

5

6

4

2i refurbishing - the underside

Documents