ACTUATOR
DEPRESS
\
'uvr
CLEAR
IN
PASSING
/
LOOSEN
SET
SCREW
/
AND
MOVE
BLOCK
FORWARD
OR
BACKWARD
AS
REQUIRED
Fig. 57.
Clearance
of
Point
of First-Engoging
Face
at
"Stop"
Q..
ACTUATOR
CLEARANCE
POINT
OF
1st
ENGAGING
FACE
Fig. 58.
Clearance
of
Point
of
First
Engaging
Face
at Moment of Trip
LOOSEN
TWO
SCREWS
LOOSEN
HEX.
SCREW
TO
ADJUST
TRIP
POINT
/TO
ADJUST
TRIP
STUD
_
i (D
STUD^i
COLLAR
TR
P
PO
NT
SHAFT
Fig. 59.
Moment
of Trip
OPERATING
ACTUATOR
2ND
ENGAGINGi
FACE ^
(HALF.SPEED)
1st
ENGAGING
FACE
(FULL-SPEED)
OPERATING
BLOCK
Fig. 60. Timing
FULL-SPEED
HALF.SPEED
BELT
SHIFTER
BELT
SHIFTER
(continued)
OPERATING-BLOCK
SETTING:
When
machine
is at "stop" position
and
shaft is depressed,
the
point
of the first-engaging face
on
operating
block should just clear actuator,
as
shown in
Fig. 57.
This will permit actuator to dropbehind first-
engaging face on operating block as machine
goes into
"stop".
To adjust, loosen set screw
shown
in Fig.
57
and
move
operating-block
forward
or back
ward, as required. Securely re-tighten set screw.
SETTING
CLEARANCE
OF
POINT
OF
FIRST-
ENGAGING
FACE
AT
MOMENT
OF
TRIP:
To
permit belt shifter to move to half-speed posi
tion before going into stop there should be .020
inch clearance between point of first-engaging
face and actuator at
moment
of trip,
as
shown in
Fig. 58.
Set machine in running position. Ratchet
machine to
bring
trip stud on high point of trip
point,
as
shown in Fig. 59. Push belt shifter
shaft forward until point of first-engaging face
is
directly beneath actuator. Check clearance
in this position as
shown
in Fig. 58.
To
adjust,
loosen hex-head screw on belt
shifter
shaft
bracket
extension
and
raise
or
lower trip stud as required. Securely tighten
hex-head
screw.
TIMING: The belt shifter, shown in Fig. 60,
should shift the driving belt
from
full speed to
half speed between the next-to-last and
last
barring stitch (4
stitches
before entering
"stop"
position).
On
Machine 271K2 this shift should
occur
between 5th and 6th barring
stitch
(6
stitches before entering '
'stop"
position).
This shift is initiated when belt shifter trip
stud is raised by trip point as shown in Fig. 59,
on disc. Tripping action instantly disengages
first
engaging face of block
from
actuator and
engages
second engaging face with actuator,
as
shown in Fig. 60, correctly moving belt shifter
and belt to half-speed position.
To time the
shift,
ratchet
the
machine until
the
correct
interval
between
stitches
is
reached.
(See
note
above).
Loosen
the
two
set
screws
in collar, shown in Fig. 59. Rotate disc on shaft
until trip point is at tripping position beneath
trip
stud,
as
shown.
Securely
retighten
the
two
collar
set
screws.
23
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