FISCHBEIN
®
MODELS 100 & 101 EMPRESS™ SERIES SEWING HEAD
OPERATOR’S MANUAL
REV. H 2005 / 11
37
1.
The speed of the bag transport belt is measured in feet per minute (meters per minute).
2.
The sewing head is equipped with a variable pitch pulley. The two sections of the pulley can be
rotated relative to each other in ¼ turn increments. (
Illustration 37
)
3.
First loosen the two set screws “
B
” with an 1/8 inch allen wrench.
The quarter turns are
indicated by the notches “A” in the top of the pulley and change the speed of the sewing
head by approximately 20 RPM
. By turning the top part of the pulley counterclockwise, the
speed of the sewing head is increased (smaller pitch on pulley). If the pulley is turned
clockwise, the speed is reduced. Once the adjustment has been made, be sure to tighten the set
screws, but be careful to only tighten the screws down across from the notch locations. These
notch locations not only mark quarter turns, but also indicate where flat sections exist in the
threading of the pulley. If a screw is locked down in an area other than the flat areas, the
threading on the pulley will be damaged and the pulley may not stay locked at this pitch.
4.
The speed of the sewing head is measured in revolutions per minute (RPM) using a tachometer
with a surface speed wheel tip to determine feet per minute (see
Speed Tables, page 39
).
Illustration 37
5.
In order to find out the stitch length, take a bag that has been stitched on the sewing head, with
the individual thread facing forward. Measure the length of 10 stitches. In the
Illustration 38
,
this length is 4” (101,6 mm).
English: This calculates to be (10 stitches / 4 inches) = 2.5 stitches per inch.
Metric: This calculates to be (101,6mm / 10 stitches) = 10,16 mm per stitch.
6.
Adjust the speed of the sewing head so that it is 2% faster than the bag transport belt {e.g.
transport belt 45 FPM (13,72 MPM) then the sewing head is to run at (45 FPM x 1.02) = 45.9
FPM (14 MPM)}.
(2)
