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Page Title: ADJUSTMENTS
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ADJUSTMENTS
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Aircrew Survival Equipmentman 1 & C - Aviation theories and other practices
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SINGER SEWING MACHINES 31-15, 331K1, AND CONSEW C-30

the  presser  bar  lifting  bracket  pinch  screw  (figure 4-11   [C]).   Turn   the   balance   wheel   toward   the operator   until   the   feed   dogs   rise   to   meet   the forward   presser   foot   at   the   top   of   the   throat   plate. Press   the   presser   bar   lifting   bracket   down   to   the hand   lifting   lever   (figure   4-11   [D]).   Tighten   the ---- presser   bar   lifting   bracket   pinch   screw   (figure   4-11 [C])   and   the   lifting   crank   pinch   screw   (figure   4-11 [B]). 5 .    A d j u s t i n g    t h e    u p p e r    t h r e a d - t e n s i o n - releasing   lever The  upper  thread-tension  release  allows  the goods   to   be   removed   without   the   needle   thread breaking. a.  Lift  the  presser-lifting  lever  and  observe the   thread   tension   disc.   It   should   separate   to release   the   thread.   If   not,   proceed   as   follows: b.  Remove  the  thread  controller  assembly from   the   machine   as   follows: (1)   Remove   the   thread   controller   as- sembly   retaining   screw   (figure   4-6   [1]). (2)   Loosen   the   thread   controller   stud setscrew   (figure   4-6   [J]). (3)   Pull   the   thread   controller   assembly away   from   the   machine. c.  Bend  the  thread  releasing  lever  (figure 4-12   [B])   away   from   the   thread   controller assembly   to   increase   the   amount   of   the   release   and toward   the   plate   to   decrease   the   tension   as   needed. d.   Reattach   the   assembly   to   the   machine and  observe  the  operation.  Repeat  steps  a  through d  if  necessary. 6.   Setting   the   feed   indicator   disc Loosen  the  setscrew  in  the  feed  indicator disc   (figure   4-1   [E])   so   that   it   spins   on   the   arm shaft.  Depress  the  feed  indicator  plunger  and  turn the  balance  wheel  toward  you  until  it  drops;  keep turning   the   balance   wheel   toward   you   until   it stops.   The   feed-driving   eccentric   is   now   set   at 3   1/2   SPI. NOTE:   With   the   plunger   engaged,   turning   the balance   wheel   toward   you   decreases   the   SPI,   and t u r n i n g    t h e    b a l a n c e    w h e e l    a w a y    f r o m    y ou increases   the   SPI. The   ideal   setting   for   the   indicator   disc   on the   sewing   machine   is   8   SPI.   You   accomplish   this setting  by  engaging  the  plunger  and  turning  the balance   wheel   approximately   one-fourth   of   a   turn away   from   you.   Release   the   plunger,   make   several inches  of  stitches  on  a  piece  of  paper,  and  count the   total   number   of   stitches   per   inch.   If   you   are sewing  8 I,   depress   the   plunger   and   slow/y   turn the   balance   wheel   toward   the   operator   until   the plunger   drops. l   S t o p. .   Release   the   plunger   and   the   balance wheel. .  Now  turn  the  feed  indicator  disc  (figure 4-1  [E])  on  the  arm  shaft  until  8  shows  in  the window   on   the   uprise   of   your   machine. .   T i g h t e n    t h e    s e t s c r e w    i n    t h e    f e ed indicator    disc. 7.   Setting   the   thread   controller   spring The   thread   controller   spring   prevents   the needle  from  piercing  the  thread.  It  takes  the  slack out   of   the   needle   thread   until   the   point   of   the needle   enters   the   material. To   properly   set   the   tension   on   the   thread controller  spring,  you  must  first  loosen  the  thread controller   stud   setscrew   on   the   tension   stud   (figure 4-6   [J]).   Turn   the   tension   stud   counterclockwise for   more   tension   or   clockwise   for   less   tension. A   properly   adjusted   controller   spring   rests on   the   thread   controller   spring   stop   as   the   point of   the   needle   enters   the   material.   This   action releases   all   tension   on   the   needle   thread. 8.   Setting   the   controller   spring   stop You   may   have   to   make   an   adjustment   to the   controller   spring   stop   to   allow   the   thread controller   spring   to   operate   properly.   This   is   a very   simple   adjustment.   By   loosening   the   tension stud   screw,   shown   in   figure   4-6   (I),   you   raise   the stop   for   less   action   or   lower   it   for   more   action. 9.   Adjusting   the   thread   tension The   thread   tension   will   be   the   last   adjust- ment   required.   In   most   cases,   you   can   make   any adjustment   required   by   turning   the   thumb   nut (figure   4-12   [A])   on   the   needle   thread   tension disc. If   the   stitch   is   locking   on   top   of   the material,   turn   the   nut   counterclockwise.    This 4-10

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