Atlanta Attachment Company 1315A, Technical Manual & Parts Lists

Page: 35 / 106

Technical Manual & Parts Lists
29
Alternating Presser with Pneumatic
Pressure Control
Adjust the height of the Pressure Cylinder with the presser feet
resting on the throat plate. There should be a clearance of 1/4”
between the Presser Bar Spring Fork and bottom of the cylinder.
To raise the cylinder, loosen the lower lock nut and tighten upper
lock nut, see Fig. 12. To lower the cylinder, loosen the upper lock
nut and tighten the lower lock nut. When correct adjustment is
attained, tighten both lock nuts.
Regulate air pressure: The correct air pressure is set for
average feeding when the Presser Bar Spring Fork rises to
approximately 1/16” from the bottom of the cylinder.
Upper Feed Roll Pressure
To regulate the pressure of the upper feed roll, turn the
thumb screw as shown in Fig. 13.
Stitch Length
To adjust the stitch length, depress the plunger, Fig.
15, located on top of the arm. Continue to hold the
plunger down and turn the machine pulley toward the
operator until the plunger enters the notch in the arm
shaft eccentric. Then turn the plunger to lock in
position. Depress the button located on the
machine bed. Hold down and turn the machine pulley
toward the operator to increase length of the stitch, or
away from the operator to decrease the length of the
stitch. Letter “A” on the machine pulley indicates the lowest stitch. When desired length is indicated by
a letter and is opposite of the arrow on the front of the machine, release button and turn the plunger to
the right or left until it springs outward.
Caution: Never turn the machine pulley with the plunger in the locked position until the button on
the machine bed is depressed.
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