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UPPER FEED ROLLER ADJUSTMENT (CONT.)
When feed roller mechanism (C, Fig. 17) has been re-
moved or replaced, .003" (0.08mm) minimum to .005"
(0.13mm) maximum clearance should be maintained
between roller and throat plate.
To Adjust Guiding System for Roller:
Loosen two screws (A). Using shim(s) adjust feed roller
mechanism (C) so that the roller is .003" (0.08mm) to .005"
(0.13mm) above throat plate. Slide rear guide finger (B)
down so that it sits on top of rear guide support block (D).
Check to make sure roller is parallel to throat plate slots.
Tighten two screws (A) to secure feed roller mechanism in
place.
Setting Pressure for Feed Roller:
Regulate the pressure on the feed roller so that it exerts
only enough pressure on the fabric to feed the work
uniformly.
Turning roller presser spring regulator (H, Fig.
17) clockwise to increase or counterclockwise to de-
crease the pressure.
Setting of Feed Roller:
Guide finger for roller should be set so that entire roller
mechanism has free movement up and down with no left
to right movement. With roller properly aligned, the edge
of roller should be parallel with feed slots in throat plate.
Guide plates (F) must be thrusted against guide finger (B)
FIG. 17
to secure feed roller mechanism (C). Thrust guide plates
(F) against guide finger (B) with equal pressure. Tighten
four screws (E) to hold plates in place.
THREAD TENSION AND RELEASE
The thread tension release is set correctly when it begins to
function at the point when the upper feed roller begins to rise.
When adjustment is necessary, loosen screw (B, Fig. 18) in lifter
lever (C). Facing the tension release shaft (A) from the right
end of the machine, insert screwdriver in slot in shaft (A). Turn
the screwdriver clockwise to raise pins (D) or counterclock-
wise to lower pins. Retighten screw (B).
DIFFERENTIAL CONTROL
FIG. 18
The amount of differential is controlled by lever (A, Fig. 19).
The adjusting plate is numbered from 1 to 9. When the lever
A
is set from numbers 1 to 4 reverse differential or stretching
occurs. The numbers from 4 to 5 produce equal feed stitching
B
while numbers 5 to 9 produce a gathering stitch. Screws (B)
can be set to limit the movement of lever (A) or lock lever in
B
one position. If top ply of material is coming out long, move
lever toward operator, if top ply is short, move lever away
from operator, as required.
FIG. 19
15
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