Textiles: weaving – Special-type looms – Circular – progressive shedding
Patent
1997-04-17
1998-08-04
Falik, Andy
Textiles: weaving
Special-type looms
Circular, progressive shedding
139110, D03D 3700, D03D 4920
Patent
active
057879389
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a fabric draw-off device in a circular loom, in which a plurality of sectional shafts are arranged in a circular way around a round reed and each carry a plurality of inner and outer harnesses for guiding a part of the two circularly distributed warp assemblages which are subjected to an opposing upwardly and downwardly alternate movement for forming the weaving or walking shed via a rotating main shaft which drives in a rotary manner the weaving shuttle in the circular reed via a plate cam and the woven hose thus formed is drawn off through the fabric draw-off device.
In such circular looms the drawing off of the fabric occurs via gear means in direct drive connection with the main shaft of the loom.
Considerably disadvantageous in such circular looms are the thin places occurring in the fabric after a weft fault caused by the exhaustion of the weft bobbin of the one or other rotating shuttle or as a result of weft breakages, for example. Although the usual weft monitoring means on the reed of the machine are usually capable, after an ascertained weft fault, of transmitting immediately a stop signal to the main shaft of the circular loom, on the one hand, and to the motor of the machine driving the fabric draw-off apparatus, on the other hand. The motor, however, will not come to a standstill abruptly, however, but will continue to rotate under the influence of the large forces due to inert-:a which have an effect on the main shaft. In this way, however, there is further drawing-off of the fabric into which fewer wefts per length of warp are woven into during the after-runnings of the shuttles, because at least one weft is missing. The shuttles will usually make two to three rotations until the complete standstill of the machine after a stop of the machine.
OBJECT AND SUMMARY OF THE INVENTION
It is the object of the present invention to arrange the fabric draw-off device of such a circular loom in such a way that the previously unavoidable thin places in the fabric as a result of the after-running of the stopped machine are prevented.
This is achieved at first in accordance with the invention by a separate motor driving via gear means at least the draw-off rollers and, optionally, the fabric bales. The speed of rotation of the motor is controllable by a computer via a speed-regulating device which is connected to the main drive of the circular loom via a pulse generator or the like for producing control pulses proportional to the speed of rotation of the circular loom or the main shaft, respectively.
This allows at first a control for accelerating or decelerating the fabric draw-off which is immediately linear to the speed of rotation of the circular loom, so that particularly in the frame zone or also during the run-up of the loom undesirable changes to the predetermined weft count are prevented.
Furthermore, the computer can be programmed through its keyboard so that the weft count can be varied in the finest of stages by changing the sequence of the control pulses in order to additionally change the speed of rotation of the motor of the fabric draw-off device independent of the speed of rotation of the circular loom.
In order to furthermore exclude entirely any weaving faults in case of a weft breakage, the computer additionally is provided with a signal connection with a weft monitoring means, so that it will cause immediately after a weft fault a readjustment of the speed of rotation of the motor of the fabric draw-off device in a predetermined manner.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplified embodiment of the subject matter of the invention is shown below by reference to the enclosed drawing which shows in a side view and in a schematic view a circular loom with the means of the fabric draw-off device in accordance with the invention in a detailed way.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The shown multiphase loom rests in the usual manner on the basic frame 1 of the machine, on which a circular frame carrier
REFERENCES:
patent: 4658862 (1987-04-01), Huemer
patent: 4942908 (1990-07-01), Imamura
patent: 5024253 (1991-06-01), Kawabata et al.
patent: 5617905 (1997-04-01), Ziegler
Falik Andy
Starlinger & Co., Gesellschaft MBH
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