Singer Inspiration 4228 User manual

Service manual
4228-4220
4212-4206
4210-4205
104 ++ ++-96
22 May 2007
A registered trademark of The Singer company Ltd or its afliates
© 2007 Singer Company - All Rights Reserved.

2 Singer Inspiration
Index
General information.......................................................................................................................4
Machine Description......................................................................................................................4
Service tools..................................................................................................................................5
How to remove the covers.............................................................................................................6
Face Cover....................................................................................................................................6
Back Cover....................................................................................................................................6
Front Cover....................................................................................................................................7
Settings
Arm shaft end play and horizontal and vertical gear mesh..........................................................10
Vertical Shaft End Play................................................................................................................11
Take-up lever and needle bar connecting link play .....................................................................12
Needle to hook relationship.........................................................................................................13
Needle bar pendulum timing........................................................................................................14
Disc stack radial play...................................................................................................................14
Needle bar height ........................................................................................................................15
Needle centralizing for zig-zag and straight stitch.......................................................................16
Needle bar safety bight stop........................................................................................................17
Needle threader...........................................................................................................................18
Presser bar height and alignment................................................................................................19
Presser bar height ......................................................................................................................19
Hook drive belt tension................................................................................................................20
Timing of Hook and Needle .........................................................................................................21
Bobbin case position nger .........................................................................................................22
Bobbin case position plate...........................................................................................................22
Bobbin case clearances ..............................................................................................................23
Feed rock shaft end play .............................................................................................................24
Feed dog centralization ...............................................................................................................24
Feed dog height...........................................................................................................................25
Cam controlled feed follower adjustment ....................................................................................26
Stitch width selector adjustment..................................................................................................26
Zero feed .....................................................................................................................................27
Buttonhole's Forward and reverse adjustment ............................................................................28
Buttonholer stitch density balance...............................................................................................29
Buttonholer pendulum timing (1-step buttonholer) ......................................................................30
Flexi stitch zeroing (accurate adjustment)...................................................................................31
Needle thread tension .................................................................................................................32
Adjusting of the thread retainer spring “M” ..................................................................................33
Bobbin winder..............................................................................................................................34
Buttonholer engage and disengaging lever.................................................................................35
Dismantling
Removing the motor ....................................................................................................................36
Removing the Needle bar Bracket...............................................................................................37
Removing the Thread tension Unit..............................................................................................37
Removing the Stitch width selector .............................................................................................38
Removing the Bobbin Winder Mechanism ..................................................................................38
Removing the Hook and Bobbin mechanism ..............................................................................39
Lubrication
Lubrication...................................................................................................................................40

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4 Singer Inspiration
General information
This manual describes all of the servicing procedures, including all adjustments and parts re-
moval and replacement for the ”Inspiration” class machines
It is intended to be used by service workshop personnel, or by salesmen who carry out servi-
cing their own districts. They assume a thorough knowledge of the handling of precision appli-
ances and accessibility to service tools.
For more detailed information regarding the construction, etc., refer to the diagrams in the
spare parts list.
Additional information covering any production changes, improvements or changes to parts will
be made by issuing Singer service parts bulletins.
Machine Description
Tubular bed.
Lightweight casting.
Sure t sewing system.
Electronic triac foot speed controller.
New ”FT” fabric feed system.
Vertical needle prole.
Motor concealed in bed.
Horizontal spool pin.
Automatic bobbin winder declutching.
Bobbin capacity of 41 m (45 yds) minimum.
Universal presser bar pressure control. Q Maximum stitch length 5 mm (5 s.p.i.).
Self-threading take-up lever.
Instant reverse.
One-way needle insertion.
One-way bobbin insertion.
Direct pattern selection.
Drop feed
One-step buttonholer
Automatic needle threader
Bed length 386 mm without cloth plate.
Bed width 150 mm.
Bed height 75 mm.
Clearance under free arm 28 mm.
Free arm circumference 264 mm.
Overall height 290 mm.
Weight 6,0 kg.

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Service tools
A reasonable requirement in a domestic sewing machine is that it should able to sew all types
of fabrics used in the home. The settings made when assembling and sewing-in the machines
are those most suited to give the best results in the majority of fabrics and fabric combinations.
In doing so, consideration has been given to the requirements of different markets. This does,
however, mean that when sewing extreme fabrics, better results may be obtained in certain
cases by altering the settings. It must be pointed out that these altered settings can cause
poorer results on more normal fabrics. How the different standard ratings are set can be seen
from the description under each setting instruction. The following list of setting gauges and ser-
vice tools is intended as an instruction about the special service tools needed to servicing this
machine.
Tool requirements
1.On several different occasions the needle is used as a setting gauge.The setting ratings are
adapted to needle 90.Make sure to use an undamaged needle.
2. Flat screwdriver 1/8”
3. Flat screwdriver 3/16”
4. Flat screwdriver 1/4”
5. Extra long Flat screwdriver (5,0 mm dim. x 380 mm long)
6. Philips screwdriver
7. Open end wrench 6, 7, 8 , 10 mm.
9. Pliers
10. Wire-cutter pliers
11. Feeler gauge GM8092
12. Feeler gauge set
13. Allen wrench 1,5 mm
14. Nose pliers 0,9 mm dim.

6 Singer Inspiration
1.Remove the Screw (A) From the back of the
machine
Face Cover
2. Lift away the face cover to the
front.
3. Remove the 6 Philips screws (B), from
the backside of the machine
4. Lay the machine on its back and remove
the 3 Philips screws (C) from the base of
the machine.
How to remove the covers
A
Back Cover
B
C

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5. Push on the cover at these 3 positions .
6. Push then the back cover away from the machine.
Front Cover
7. Remove the stitch dial , by pulling it
straight out
8. Squeeze the ring in the middle to-
gether and pull it then straight out.

8 Singer Inspiration
9. Remove the Tension Dail, by pulling it
straight out.
10. Remove the Presser bar presure knob by
pulling it straight out.
11. Remove the handle, towards the
back
12. Remove the 2 Phillips screw (G), from the back
of the front cover
G

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13. Remove the 2 Phillips screw (H), from the back
of the front cover
14. Remove the Phillips screw (I), from the back of
the front cover, located just beside the motor belt
15. Remove the front cover to the front, and at
the same time remove the on/off switch from the
front cover.
H
G
H
I
I

10 Singer Inspiration
Setting
Arm shaft end play and horizontal and vertical gear mesh
1. Loose the collar screw (a).
2. Push the hand wheel and arm shaft (b) to the left.
3. Insert a 0,23 mm shim gauge as indicated in the illus-
tration and pull the handwheel and arm shaft to the right.
4. Loose the gear screw (c) and lightly move gear
(e) to the left until it just touches the gear (d).
5.Tighten securely the gear screw (c).
6. Remove the shim gauge and pull the hand
wheel and the horizontal shaft to the right.
7. Push the collar to the left until it just touches the bushing.
8. Tighten rmly the collar screw (a).
Note that there are two identied teeth on the arm shaft gear, and only one tooth on the verti-
cal shaft gear. This tooth must be located between the two teeth on the arm shaft gear.

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Setting
Vertical Shaft End Play
Check
The vertical shaft must be set to have 0,000 to 0,025 mm. If incorrectly set, noise may be gene-
rated.
Adjust
1. Loose the pulley screws (A) and (B) on the pully (C).
2. Push down on the vertical shaft (e) and push up on the pulley (C) with the cam (D), tighten
the screws (A) and (B).
3. Make sure the shaft rotates freely without binds.
4. Recheck and readjust if necessary the gears of the shafts horizontal and vertical
5. Adjust hook timing.
A
B
C
C
D
E
0.025 max

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Setting
Take-up lever and needle bar connecting link play
Looseness in these parts will cause the machine to run noisy and may cause irregular stitching.
Check
1. Remove needle and presser foot.
2. Run the machine at maximum speed and check for rapping noise in head end.
3. Turn handwheel to bring the needle bar to its lowest position.
4. Grasp the needle clamp and check for excessive vertical and radial play, by moving needle
bar up and down rotatively.
Adjustment
1. To correct, loosen the two screws (a).
2. Press rmly the stod (b) against the crank (c) and tighten the screws (a).
3. Turn the handwheel through several revolutions and check for binds. Readjust if necessary.
4. Recheck for noise or radial play.
NOTE! If excessive play still exists, the parts must be replaced.

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Setting
Needle to hook relationship
Proper needle to hook relationship is important to prevent skipping of stitches if needle is too far
from the hook, and hook or needle damage if the needle is too close to the hook.
NOTE! Always use a new needle for checking and adjusting
Check
1. Set the machine on straight stitching
2. Remove the needle plate, the bobbin and the bobbin case.
3. Check the hook point. If the point is bent or burred - replace the hook.
4. Rotate hand wheel until the tip of the hook arrives behind the needle.
5. Check the gap by pressing a small screw driver against the needle.
The gap should be as small as possible, but max 0.15 mm.
Adjustment
1. Loose the two screws (a) lightelly.
NOTE! When the two screws (a) is loosened up the needle in center position can change.
2. Move the pivot (b), located on top of the needle bar, to the front or to the back until distance
between the point of the hook and the needle is correct.
3. Tighten securey the two screws (a).
4. Recheck and readjust if necessary.

14 Singer Inspiration
Setting
Needle bar pendulum timing
Check
1. Set machine for widest zig-zag.
2. Hold a piece of paper on the needle plate and raise the presser foot.
3. Turn handwheel. As the needle is raising from the right perfo-
ration, the point of the needle should be moving to the left, lightly
touching the edge of the hole without enlarging it (d).
4. The needle should reach its peak of ascent slightly past center
of the two extreme position of the needle (e).
5. On the downward stroke, all lateral movement should cease
when the needle point is 5,5 to 8,5 mm above the needle plate
(g). The needle must return into the opposite hole precisely.
Adjustment
1. Remove the Bobbin winding unit.
2. Loose up the two Allen screws (a) and (b) of the spindle (c)
3. Turn the spindle to the front or to the back to reach the correct
adjustement .
3. Tighten the two screws (a).
4.Recheck and readjust if necessary.
5.Check for the disc stack radial play and readjust if necessary
6. Check the hook timing and re-adjust if necessary.
Disc stack radial play
When the arm shaft rotates, the discs cylinder rotate together, and without binds.
1. Loose the two Allen screws (a) and (b) of the spindle (c).
2. Hold the discs cylinder and push the spindle manually frontward or backward to eliminate
radial play.
- Frontward: Tighter
- Backward: Looser
3. Tighten the screws (a) and (b).
4. Turn hand wheel to verify the machine is running freely.
5. Check and adjust if necessary the needle bar pendulum
timing.
The follower must be located in the center of the discs
track. Turn the pattern selector to check the follower is cen-
tralized in the center of the track.
d
e
g

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Setting
Needle bar height
Check
1. Set the pattern selector at straight stitch position.
2. Turn the handwheel to bring the needle bar to its lowest posi-
tion.
3. When the upper mark (a) is aligned with the bottom face of the
bushing (b) the needle bar height is correct.
Adjustment
1. If the mark is not aligned with the bottom face of the bushing
(b), loose the screw (c) a little, and push the needle bar up or
down to bring the mark (a) to the correct position.
2. Tighten the screw (c).
3. Check by means of a twin needle that the needle bar is not
twisted, it may cause jump stitches when sewing with a twin
needle.
4. Check the hook timing and readjust if necessary.

16 Singer Inspiration
Setting
Needle centralizing for zig-zag and straight stitch
Zig-zag centralizing:
Check
1. Set the machine to maximun zig-zag
2. Turn the handwheel to the front of the machine and observe the needles zig-zag centraliza-
tion according to the needle plate slot.
3. The distance on both sides should be equal.
Adjustment
1. To centralize, loose the screw (a) and move the lever
(b) to the left or to the right.
2. Tighten the screw (a).
3. Recheck and readjust if necessary.
Straight stitch centralizing:
Check
1. Set the machine to straight stitch
2.Turn the handwheel until the needle reaches the needle plate level.
3. Observe the centralization.
Adjustment
1. Loosen the allen screw (c)
2. Turning the eccentric screw (e) to the left or to the right.
3.Tighten the screw (c).
4. Re-check and readjust if necessary.
5. Check the hook timiming and readjust if necessary.
6. Check the zig-zag centralizing and readjust if necessary.

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Setting
Needle bar safety bight stop
Check
1. The needle should be set to its maximum zig-zag position and the needle set to its right hand
position in needle plate.
2. When the needle bar is pushed to its most right position, by hand, the needle should just
slightly touch the right hand sides needle plate slot end.
Adjustment
Adjust the bight stop by moving the thread guide that is located under the face plate.
1. Set the stitch width selector to a maximum zig-zag position.
2. Turn handwheel so the needle comes to its most right position, with the point of needle a little
inside the needle plate slot.
4. Loosen the two screws (a) .
5. Push the needle bar to the right until the needle slightly touches the needle plate slot end.
5. push the guide line (b) until it touches the bracket (c).
5. Readjust if necessary.

18 Singer Inspiration
Setting
Needle threader
To adjust needle threader is sufcient removing the face plate.
Check
1.Turn handwheel to set the needle bar to its highest position.
2. Press the needle threader actuating support down.
3. The Hook (D) shall go smoothly into the needles eye.
If the hook do not go correctly, then a lateral or height displacement may
be present.
NOTE! Before any adjustment is done, ALWAYS check the needle bar height.
Adjustment - Height
1. Loose the screw (c) and move the stop (d) up or down to centralize hook
inside the needle eye.
2.Tighten screw (c) making sure no interference is present between this stop
and the support (e).
Adjustment - Lateral
1. Loose screw (f) on guide plate (g) and slide this plate to the left or right to centralize the hook
inside needle eye.
2. Tighten screw (f). Do not overtighten the screw to prevent damage on the inner nut thread.
3. Recheck to conrm.
Fig 2
D
D
Fig 1

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Setting
Presser bar height and alignment
Check
The presser foot (A) should be parallel to the Needle plate slot (B).
Adjustment
1. Loose the two allen screws (a) to release the position plate.
2. Move the presser bar (b) to the left or to the right until it is parallel to the needle plate slot.
3. Tighten the screws (a).
Presser bar height
Check
When the presser foot is in its highest lifting position
it shall be between 7,35 to 7,60 mm above the needle
plate.
Adjustment
1. Raise the presser foot.
2. Loose the screw (c).
3. Raise or lower the presser bar to reach the distance of
7,35 and 7,60 mm from the underside of the foot and the
surface of needle plate.
4. Tighten the screw (c) and check so the presser foot (A)
is parallel to the Needle plate slot (B).
5. Re-check and re-adjust if necessary.
A
B
7.35-7.60 mm

20 Singer Inspiration
Setting
Hook drive belt tension
Check
1. Remove the Needle plate, the bobbin case holder and the bobbin case
2. Rotate the hook back and forth and check the play, it should be small as possible.
Adjustment
1. Loose the screw (a) and adjust the tensioner so that a weight of 140 g, centrally located
between the pulleys, deect the belt 4,8 to 6,4 mm.
2. Tighten the screw.