INTRODUCTION

This section covers the mecha-nisms revealed when the coverplates are removed. This includesremoving, cleaning and resettingthe feed dog, hook ring and lowerbobbin.

(1) You will find it easier andpossibly less painful if youremove the presser foot and theneedle before starting work inthis area.

COVER PLATES

(2) The semi-circular feed plates,while different in size, all attachin the same way with two screws.These are easier to remove byusing a long screw-driver, (a)particularly one with the bladecut at an angle of 150 or (b) with acranked (or angled) screwdriver.Clean and set aside.

(3) Remove the rectangular cover by lifting the inside edge up a little, pushing it over the feed dog and slidingit off.

Before you stow it away, clean outthe grooves underneath with adiscarded needle or a knife bladeand give a single drop of oil toeach.

(4) The cover is held in place witha plate spring. Brush out anydebris from this area and checkthat the spring is intact.

The screw holding this spring inplace has a very narrow diameter.If you decide to remove it forcleaning, be very careful howmuch force you use.

FEED DOG

This is held in by a screw underthe machine shown here.

(5) Turn the machine up on end,resting on the face plate, ifthe screw is difficult to turn.

(6) The feed dog can then belifted out upwards from themachine for cleaning. (This oneneeded it!)

Make sure you remove all flufffrom between the teeth of thefeed dog as well as giving it ageneral clean. Put to one side forthe moment as it is easier toclean the hook ring area with itout.

HOOK RING AREA

The components are shown inthese illustrations. The early typehad a fixed bobbin holderposition bracket.

The later type was changed toallow the removal of the bobbinholder without removing theposition bracket as well. In bothcases remove the bobbin holderand the position bracket to cleanthe hook ring.

Early type

(7) Undo the screw holding theposition bracket in place.Take it out and the bobbin holder should also come outeasily.

Later type

The position bracket now con-sists of two parts, the main bodyand a latch plate, joined by ascrew.

LOWER BOBBIN AREA (66 & 99)

[2] H - 1

2.3.2006

22

1

5

4

3

2

6

7

(8) By hooking a fingernail underthe latch plate, it can be liftedand moved side-ways, makingenough space for the bobbinholder to be re-moved.

(9) To remove the main body first undo the screw and remove the latch plate.

The screw holding the positionbracket in the early type isreplaced by a pin (see arrowabove).

(10) The pin is held in by a grubscrew under the base plate.Loosen this screw.

(11) Now locate the underside ofthe pin. Its position is shown hereand can usually be seen as asmall shiny circle.

Push on this with a nail punchand it will lift up and can beremoved from the top. Hold theposition bracket aside forcleaning.

(12) Now clean the hook ring.

If the machine is of any age it willhave collected a lot of fluff, whichmixed with oil can take a while toremove.

Scrape round the inside of thehook ring as well as the outside,and clean the cuts in its surface.Do not try to remove the hook ringfor cleaning - it destroys themachines timing.

Clean out any debris from thehook ring area and check thecondition of the actual hook(arrowed). It should have a cleansharp point, free of fluff.

Bobbin Holder Position Bracket

(13) Apart from keeping thebobbin holder in position, thisunit has:

a felt wick to keep the hookring free of fluff

a lever, which when depressed,lifts the bobbin out of the holderfor easy removal.

at one side there is a flatspring that provides a smoothpath for the upper thread as itgoes round the bobbin holder.

(14) If the felt has been worn,remove it in its springholder.

The felt can be difficult to removefrom its holder. Some-times ityields to snipe-nosed pliers, ordriving an old needle throughfrom the side and unscrewing it.

As a last resort, a small drill canbe used to bore most of it out andthen pick the rest out with aneedle.

Clean the rest of the bracket. Astiff toothbrush is ideal for this.

[2] H - 2

LOWER BOBBIN AREA (66 & 99)2.3.2006

2 2

8

12

11

10

9

Latch PlateLatch PlateScrewScrew

LatchLatchPlatePlate

13Bobbin HolderLocating Spur

BobbinLiftingArm

FeltThreadGuidance Spring

14

If needed, a new felt can be cut.At present, Netley Marsh has asmall stock of this felt, 5 mmthick, which can be supplied in astrip 17 mm wide. From this atrapezium needs to be cut, with awide end 9 mm and the other end3 mm.

(15) If these are cut fromalternate directions there isvirtually no waste. Make a cut 5mm deep in the wide end to fitover the rim of the hook ring.

(16) Screw the narrow end of the felt into the spring as far asit will go

Then screw the spring into theside of the bracket, finishing withthe slot horizontal. It is nowready for refitting.

BOBBIN HOLDER

Remove the bobbin and clean theholder. You will see there are twosmall screws in the side of theholder: the fixing screw and thetension adjustment screw.

(17) There is a small spring in theside of the holder which controlsthe lower bobbin thread tension.The fixing screw fastens thespring to the body of the bobbinholder, and the other varies thetension on the spring.

(18) After cleaning, return thebobbin to the holder. Holdthe bobbin with the threadleaving it in an anti-clockwise direction.

(19) Draw the thread into the topof the slot in the side of thebobbin holder...

(20) ...then backwards so thethread is drawn into theexit slot.

The thread then feeds from thenotch in the bobbin case towardsthe needle.

Check that there is someresistance when you pull the endof the thread. To be precise, thisshould be equivalent to 1 oz (28grams).

You can test this by hanging a 1oz weight or equivalent (3 onepound coins) from the threadand turning the bobbin holdernearly vertical. The threadshould just about leave thebobbin.

Adjust the tension as required. Ifyou cant get enough tension, it isprobably one of two reasons:

The spring has been dam-aged. Fit a different one if youhave a spare, or note for attentionon the checklist.

Fluff has collected under thespring. Remove the spring, cleanand refit.

REASSEMBLY

(21) Place the bobbin positionbracket in the hook ring in its approximate position.

(22) Now replace the bobbinholder, so that the groove inits side saddles the edge ofthe hook ring and the notch in its end is located in the spuron the position bracket.

Now wriggle the position bracketinto place, with the felt half aboveand half below the hook ring topedge.

LOWER BOBBIN AREA (66 & 99)

[2] H - 3

2.3.2006

22

18

19

20

17

15

16

ThreadExit Notch

ThreadEntrance

TensionAdjustmentScrew

FixingScrew

21

22

If you have the early model withthe screw, make sure the tail ofthe position bracket is in itsnotch, then fasten the screw.

(23) If you have the pin type,insert the pin until theshoulders of the pin are completely in the positionbracket, then tighten thegrub screw holding it inplace.

(24) Finally, put the latch plateback on the position bracket, and replace its screw - but not tight at thisstage.

The screw hole in the plate is largerthan the screw, so that althoughthe plate is held firmly in thenotch, the bracket underneathcan be moved from side to side.

It is essential that, when thescrew is finally tightened, there isa small gap between the back ofthe bobbin holder and theposition bracket to allow the topthread to slip through unhin-dered when the stitch is made.See picture (9) on page H - 2.

If a large gap is left, the machinewill work, but can be noisy.

(25) Lever the position bracketacross to make this smallgap...

(26) ...then press down firmly on the plate with a fingerwhile tightening the screw.

Give the balance wheel a coupleof turns to make sure everythingis in the right place.

LOWER BOBBIN AREA (66 & 99)

[2] H - 4

2.3.2006

2 2

23

25

26

24

201

(1) Remove square cover in thesame way as the 15K (seepicture and paragraph 11 onpage H-6). Remove, presserfoot, needle and bobbin.

(2) The 201 lower bobbin area isshown here. The hook ring andbobbin holder has been con-densed into one neat package.The only other component is (B)the bobbin holder latch. Theoperation is as follows:

The hook (A) turns clockwise and picks up the thread fromthe needle. It continues torotate, carrying the thread with it over the top of thelower bobbin.

As the take up arm ascends, the thread is pulled downthrough the gap (E) betweenthe bobbin holder arm and the bobbin holder latch.

The thread slips off the hookand the stitch is made whilethe hook ring makes anothercomplete revolution, i.e. two revolutions per stitch.

The picture also highlights thetwo clips, (C) and (D) that holdthe hook ring and bobbin holdertogether as a unit.

(3) Remove the bobbin holder latch for cleaning.

The illustration is of the under-side of the part. The spring threadguides tend to collect fluff.

Clean round and under the hookunit with a brush or cleaning rag.Frequently, you will find that youcan avoid removing the unit forcleaning. Most of the debriscollects inside the bobbin holderand can be removed with acleaning rag.

(4) If very dirty however, removethis unit from the machine by undoing the large screwwhich can be seen in the centre.

Hold onto the balance wheelwhile you undo this, as the hookring will be turned by thescrewdriver.

(5) If this proves difficult, place a block of wood on the baseplate underneath the needle holder.

When the needle holder descends,it will stop the machine action. Ifthe screw is really stubborn, donot persist. You are in danger ofspoiling the timing of themachine.

Instead, lever back the two clips,(C) & (D) and remove the bobbinholder and its retaining ring,leaving the hook ring in place.

(6) Otherwise, take out the unitfor cleaning. Unscrew the twoclips (preferably over a containerto prevent losing the screws).

(7) The unit will then come apartinto the three pieces shown.

The bobbin holder is a sliding fitwithin the hook ring. There is acircular groove in the top of thebobbin holder, and the retainer ringhas a circular tongue which corre-sponds with this to hold it in place.

LOWER BOBBIN AREA (201 & 15K)

[2] H - 5

2.3.2006

22

1

6

7

2

4

5

3

Retainer Ring

Bobbin Holder

Hook Ring

Clean all the components andreassemble. Put a single spot ofoil in the groove on the bobbinholder before replacing theretainer ring.

(8) Replacing the retainer ring.

(9) Hook the end of the clip on to the top, press it in to the side of the hook ring so that the holes for the screw lineup underneath and fasten.

Repeat for the other clip.

If you did not remove the unit toclean it, lever the clips out fromthe side of the hook ring slightlywith small screwdrivers or sliversof wood. Reassemble the parts,lining up for the clips as above.Then remove the wedges andpress the clips into place.

Replace the bobbin holder latch,with the bobbin arm secured asshown in picture 2.

The hole in the centre of thescrew holding the bobbin holderin place is an oiling hole. Give itone or two drops of oil before youreturn the bobbin.

Test that there is some tension onthe thread as covered for the66/99 on page [2] H - 3.

Finally replace the feed dog aftercleaning.

15K

This is the earliest of the roundbobbin machines we send.

(10) It uses a larger bobbin, notinterchangeable with that for theother machines.

(11) Remove the cover plate bylifting the outside edge veryslightly and twisting the

plate with a little presuretowards you and upwards.

(12) Remove the rear cover plate,presser foot and needle.

The lower bobbin, hook ring etcis enclosed in a removeable unit -the shuttle race.

Although unfamiliar in appear-ance, this unit works in exactlythe same way as the others.

As the hook reaches the end of itsdownward travel, the thread slipsoff the hook. The take up arm isrising and pulls the thread upover the bobbin face, past thebobbin holder arm and the stitchis made.

[2] H - 6

LOWER BOBBIN AREA (201 & 15K)19.2.2006

2 2

8

The location positions forthe clips can clearly beseen on the hook ring andthe retainer ring.

The pointed end of theretainer ring has to beslid round slightly underthe hook to line up theclip positions.

9

The clip opposite the hookis the easiest to align.

clip.

10

11

12

(The hook ring is turned bythe driving yoke and oscillates

forwards and backwards)

The threadloop fromthe needle...

...is pickedup by thehook...

...and brought clockwise overthe face of the bobbin holder.

It is easier to work on the shuttlerace if you rest the machine on itsbalance wheel end.

(13)Remove the bobbin holder by lifting the latch on its face.

As the latch is raised, a bar under-neath it slides across and gripsthe edge of the bobbin cheek,holding it inside the bobbinholder.

Check that it does so, becauseotherwise with the verticaloperation, it is difficult to returnthe bobbin holder with itsbobbin after changing the thread.

(14) Raise the needle bar to itshighest position, undo the

two screws on the front ofthe shuttle race and the unit will lift off.

If it is stuck with old oil, levergently with a screwdriver to re-lease it.

Now is the best time to clean thefeed dog and the area sur-rounding the shuttle race.

(15) Turn the shuttle race over totake it apart and undo thelarge screw which releases the spring plate.

The unit can now be brokendown into its three parts; thefront and rear parts of the shuttlerace and the hook. Clean allthree.

(16) The two halves of the shuttlerace are located together by pins.When in place they provide asquare-edged channel for thehook to slide in, while holding itin place.

(17) The hook is turned by thedriving yoke at the end of themain driving rod.

(18) Note that the hook has aspindle to locate the bobbinholder. At the top of this spindlethere is a circular groove.

Check that when the bobbinholder latch is closed, the barunderneath it slides across intothis groove, preventing thebobbin holder from falling out.

The tension spring on the bobbinholder has only one screw. Thetail of the spring is held in a slot,so the screw can combine thefunctions of holding the bobbinin and vary the tension. It iseasier to check the tension beforereturning the bobbin holder tothe machine.

Re-assembly

(19) After cleaning thoroughly,marry the two halves of theshuttle race together. Put thespring plate on, with the twoarms just inside the two pin endsand tighten the retaining screwcompletely.

LOWER BOBBIN AREA (201 & 15K)

[2] H - 7

19.2.2006

22

13

17

18

14

15

16

19

(20) Next, put the hook into thechannel in the shuttle race.

Put the hook vertically into therace from the rear. First locate thepoint of the hook in the channeljust to the left of centre at thebottom with the hook leaningbackward. Now bring the hookup vertical.

Push the hook to the right and itwill fit into the channel. Hold itthere while you fit the whole unitback into the machine.

(21) Tighten the two holding bolts. Refit the bobbin holder, with the arm located in the notch at the top of theshuttle race.

Turn the balance wheel a fewturns to make sure everythinghas gone back into its right place.

LOWER BOBBIN AREA (201 & 15K)

[2] H - 8

19.2.2006

2 2

20

21