Textiles: spinning – twisting – and twining – Apparatus and processes – Driving
Patent
1986-07-31
1988-08-02
Watkins, Donald
Textiles: spinning, twisting, and twining
Apparatus and processes
Driving
57263, 57406, D01H 126, D01H 1502
Patent
active
047606886
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The instant invention concerns an open-end spinning machine with a plurality of spinning stations located next to each other, having spinning elements driven collectively by a collective drive, and a process for thread joining on such a machine. In a known process, thread joining is carried out at reduced rotor speed, whereby the speed of fiber feeding and thread drawoff is adapted to this reduced number of RPMs of the rotor in such a way that the rotor speed ratio between the individual spinning elements is maintained at all times as it was preset for spinning production (German Pat. DE-OS No. 2,058,604, corresponding with U.S. Pat. No. 3,791,128). In order to attain this reduced rotor speed for thread joining at an individual spinning station in a simple manner when a plurality of spinning stations are driven collectively, the RPM's of the spinning rotor are scanned during run-up to production speed, and the thread joining process is started when the reduced number of RPMs is reached (German Pat. DE-AS No. 2,341,528, corresponding with U.S. Pat. No. 4,276,741 and DE-OS No. 2,610,575). However, the time available here and also the number of RPMs are not constant and vary in particular depending upon the running condition of the machine and of the individual rotor bearings. This not only influences the success of thread joining but also the speed and the quality of the joints.
Another known method consists in providing a step-up gearing between a drive belt and the rotor shaft for each spinning station and to preset two step-up ratios which can take over the driving of the spinning rotor alternately for thread joining or for production, as desired (German Pat. DE-OS No. 2,754,785, Japanese Pat. JP-PS-AS No. 21.966/84. Although rotor speed is thus reduced by a certain percentage for thread joining, this speed is always in a fixed relation to the production speed of the rotor. Thus the rotor speed for thread joining is different from and dependent from production speed.
The instant invention is based upon the surprising finding that the rotor speed for thread joining should not always be uniformly low, and should not always be reduced at a fixed ratio to the production speed of the rotor. The correct rotor speed for thread joining depends in each case upon the fiber material to be spun.
It is therefore the objective of the instant invention to avoid the disadvantages cited above. In particular, it is the objective of the instant invention to create a simple device by means of which a second rotor speed can be attained individually at a spinning station whereby it is possible to select said rotor speed in a simple manner in accordance to spinning conditions, and independently from the production rotor speed.
It is a further objective of the instant invention to create a thread joining process which improves successful piecing and the quality of the joints.
This objective is attained by the invention by providing, in addition to the collective drive, a stationary auxiliary drive which can be attributed to (i.e. associated with) the spinning element of each spinning station individually, instead of the collective drive. The speed of this second, stationary auxiliary drive which can be individually attributed to the spinning elements can be adapted as needed to any given fiber material, rotor diameter, etc. at a central location. Since this adjustment is carried out once per machine or per section, such an adaptation to a different type of fibers is economical from the standpoint of both time and material. The auxiliary drive is preferably located in the end frame of the machine.
The concept of "spinning element", in the sense of the instant invention, shall include all elements required for the spinning process. This is preferably a spinning rotor, but this concept should also comprise, in addition to a spinning rotor, a pair of friction rollers as well as other elements of a spinning station, for example the feed roller, etc.
According to a preferred embodiment of the o
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Schubert & Salzer Maschinenfabrik
Watkins Donald
LandOfFree
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