Singer 270 - Singer Service Manual Reel Driver Tripping Points; Singer Service Manual Pre-Tension Adjustment

SET SCREWS
~
TRIPPING PO I NT
EXTENSION
Fig. 41. Adjuoting tht> Tripping Points
REEL DRIVER TR I PPING POINTS
CHECK,
Tripping point on outside edge of feed com, Fig.
41, sho uld be set to engoge the reel winding li nkage
when the hook point hos rotated approximately 1/ 4
revolut ion pa st loop toki 11~ (J lu 4 o'clock).
Tripping point exte n ~ i on a l so shown in Fig. 41
con trols the duration of time in which the rf:el is
wound and conseque nt ly the amount of thread that i s
wound on the reel.
The cdj ustment of the trippi ng point extension
var i es with the typt> of operat ion performed but may
be generally set to re l 6ose the winding mechanism
when
the hook hos r otated slight ly less than one full
r
evolution from loop taking (11 to 12 o'clock) .
SETTIN G 1: (Tripping Point)
L oosen set screw shown in Fig. 41 and position
tripping point to engage the wi nding mechanism when
t he hook poi nt has rotated approximate ly 1/ 4 revolutio n
pas t loop taking. Secure ly tighten set screw.
SETT I NG2: (Tripp ing Point Extension)
Lo osen two se t screws in trip pin g po in t ex t ens i on
and 1nove extens ion to ob ta in the desired amount of
wind. Secu re ly tig hten tw o se t screws and ad just
pre -te nsio n.
24
NOTE: For cams having two se ts of tr i pping points,
repeat proceedure for other set.
PRE -TENSION
CHECK:
Prc.tcnsion device shown in Fig. 42 ai ds in
co ntrolling th e amount of th rea d that is wound onto the
reel.
SETTING,
Turn thumb nu t os required pro duce o slight dr ag
on needle threod .
T HUMB NUT
Fig. 42. Ad j ust i ng tho P re .. T ens ion