Chapter 2: Threading
1. Types of yarns
a. Needle yarn:
Many types of yarns can be used on the machine. Good results have been obtained
with following qualities : Nylon polyamide yarn of thickness 30 or 40,
Monofil (invisible) thread of 750 denier. (0,3 mm diameter) or
cotton (for example, mercerized cotton, thickness No.18).
b. Chain yarn (or “looper yarn”):
A wide range of threads can be used with DK 2500 machines.
Good results have been obtained with following qualities:
Polypropylene and Polyamide Nylon are most frequently used in thickness ranging
from 1800 detex till 5200 detex. The threads
should be very lightly twined. This
gives better results after sewing, because the thread flattens out and covers the
carpet better.
Other qualities like wool, acrylic or cotton have also been used with success.
2. Threading
Remark: always switch off the motor prior to threading the yarns!
a. Needle thread
Refer to FIG 2.1 THREADING DIAGRAM for the details.
b. Chain yarn
1. Turn the hand-wheel by hand and bring the take-up D in its topmost
position. Lead the yarn thru the tension-adjusters A and B and by hole C thru the
plates on both sides of the take-up D.
2. Turn the hand-wheel by hand and bring the take-up D in its
bottommost
position. In this position the eye of the lower looper faces the threading tube E
3.
Thoroughly clean (if necessary, using the threading needle, part 25900) the
lower looper's eye.
4. Tightly wrap the chain yarn around the point of the threading needle and push it
all the way (as far as possible) into the threading tube and through the eye of the
lower looper
F.
5. Gently remove the threading needle and push some more chain yarn into the
threading tube in order to obtain a small tangle of chain yarn behind the lower
looper's eye F
. R
EMARK: Remember : remove the THREADING NEEDLE ALWAYS.
6. Turn the flying-wheel by hand to make sure the chain yarn extends above the
needle plate.
7. Make sure the needle thread remains threaded. The sewing machine is now
ready for use.
Note: For improved covering, use two or three thinner threads in the lower
looper.
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