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Fig. 3 The open duodrafting
arrangement
– suitable for all types
of fiber.
operator to optimally control the bobbin conveyor
belt and the bobbins can be conveniently removed
and placed on pallets (Fig. 2). At the other end of the
J 20 – between the last section and the tube loader
– there is a free space as the service area for the robot
at the rear.
Market-conform yarn and bobbin quality
With the J 20, the bobbin tension can be set over the
whole bobbin. This, together with the image interference
device, guarantees a perfect bobbin building
process. The J 20 machines are equipped with the
latest yarn clearer USTER Quantum Clearer 2; in line
with the customer’s requirements – with capacitive
or optical sensor – with or without foreign fiber detection.
All yarn clearer settings are entered on the
J 20 touch screen. All disturbing yarn faults, neps,
thick or thin places and optionally also foreign fibers,
are detected and cleared – an essential prerequisite
for the downtime-free further processing of the yarn
in weaving or knitting plants and a high-quality and
even fabric appearance.
New duo-spinning unit
The new spinning unit of the J 20 achieves a high
yarn strength and low number of imperfections. The
drafting arrangement of the duo-spinning unit can
be precisely and reproducibly set. Controlled fi ber
guiding leads to good yarn quality as well as to a low
number of quality cuts and natural thread breakages.
The operator involvement is significantly reduced.
With the J 20 duo drafting arrangement the productivity
– compared with that of the J 10 – can be increased
by 5% and this with equal or improved yarn
quality.
With the duo-spinning unit, the field of application
for the air-jet spinning machine has been successfully
extended. The J 20 can process viscose, Modal and
blends with cotton. Deposits of fiber-fly and dirt are
prevented by an optimized suction on the duo-spinning
unit. There are practically no fiber deposits due
to the open duo-drafting arrangement (Fig. 3). Any
fiber-fly is removed by the robot in passing.
The findings of the technological development and
practical experience with the J 10 have been incorporated
into the development of the J 20. The
LINK 58 . 2 /2011
PRODUCT NEWS
duo-spinning unit has numerous exchangeable technology
elements with which it is possible to process
different fiber materials and fiber counts or to
achieve different yarn properties.
Automation with 4 robots
A J 20 air-spinning machine with 120 spinning positions
is equipped with 4 robots, 2 on each side of the
machine. The robot has various tasks: It cleans the
spinning position and automatically pieces the yarn
after a thread break or a clearer cut. It changes full
bobbins and threads up the empty tubes – so-called
doffing. A fan on the robot cleans the spinning positions
from fiber-fly in passing.
The robot of the J 20 is based on the automation
technology of the rotor spinning machine. The wellproven
Rieter piecing technology with almost yarnlike
piecings leads to a high yarn quality. The entire
J 20 piecing process is electronically controlled, assisted
by the yarn clearer, and settings can be made
on the machine display panel. The step-by-step introduction
of new fibers gives the piecing a yarn-like
appearance. The spinning technology guarantees
that all fibers of the yarn end are perfectly bound in
the piecing process – contrary to conventional splicers
(Fig. 5). The piecers thereby formed fulfill all requirements
in downstream processing.
The robot works with a high degree of dependability.
If problems occur, a trouble shooting program
is shown on the robot display so that faults can be
remedied without an instruction manual. When one
of the two robots is in the separate maintenance and
service station, the other robot automatically operates
over the entire machine side.
Flexible, simple machine settings
High production speeds mean that the lots to be
spun are finished increasingly quickly. The faster a
machine spins, the quicker it should be able to be
set for new orders. The machine concept of the J 20
is therefore arranged so that both machine sides are
optionally entirely independent of each other. This
makes possible the production of 2 different articles,
i.e. yarns at the same time and increases the production
flexibility of the spinning plants. 2 bobbin transport
belts and the separate conveyance of empty
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