Textiles: spinning – twisting – and twining – Apparatus and processes – Piecing up
Patent
1987-01-05
1989-04-04
Hail, III, Joseph J.
Textiles: spinning, twisting, and twining
Apparatus and processes
Piecing up
57401, D01H 7882, D01H 1502
Patent
active
048173800
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The instant invention relates to a device for piecing up an open-end friction device equipped with two friction spinning elements, driven in the same direction, and forming a nip subjected to suction, to which a thread end is fed into a piecing position outside of the nip and is delivered therefrom into a thread forming zone in the nip. It is drawn off from said zone in the form of a continuous thread as fibers fed to the nip are incorporated into it. The invention also relates to a device to carry out this process.
In a known process of this type, the thread end is fed back from outside the nip as far as a suction nozzle by means of a guide, with the cover being open (see German published application No. 3,318,266). By means of an appropriate movement or a suitable drive of the guide, an intermediate segment of the thread is delivered to the nip of the friction spinning elements which formerly have been stopped. The cover is then closed and the thread draw-off is switched on. The friction spinning elements are again driven and the fiber feeding is started so that the fibers reach the nip at the same time as the thread end. Since the desired amount of fibers fed does not get into the nip all at once but only gradually, a thin segment of thread cannot be avoided following the point where the thread end is combined with the fibers. Such a thin segment leads to increased thread breakage because of lower strength. However, if the fiber feeding starts up before the thread end is pulled out of the suction nozzle, and gets into the nip, a long joint, constituting a thick segment is formed, and this is undesirable for reasons of appearance.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to create a process and a device for securely piecing up an open-friction spinning device and thus to reduce the size of the faulty segment produced by the piecing.
This object is achieved according to the invention in that the thread is fed to the nip in such manner as to cause the thread to reach the thread forming zone with its free thread end first and by controlling the feeding of the fibers into the nip so that the thread end comes into contact with the fibers at the same time as it reaches the thread forming zone. The thread segment coming into contact with the fibers is thus quite short.
This thread segment is now drawn off from the nip and incorporates at the same time the fibers fed into the nip. Since the thread end comes into contact with the fibers only when it reaches the fiber forming zone and since it already is in the nip at the beginning of the spinning process and does not yet have to be brought into said nip after another thread segment has already started to incorporate fibers, the faulty segment in the newly pieced thread is very short and generally is even shorter than the length of the fiber feeding zone which is determined by the length of the outlet of the fiber feeding channel. Here, the thick segment in the thread joint is even shorter since not the entire length of the thread being fed back into the longitudinal reach of the friction spinning elements gets into the nip, but only the end segment of the thread away from the draw-off side. A thin segment, following the thread joint can be avoided through time-control of the beginning of fiber feeding which can be controlled independently from the thread feeding into the nip.
The process according to the invention in which the thread reaches the thread forming zone first with its free end, shall also include a process in which only the end segment of the fed-back thread reaches the thread forming zone and the thread segment between the end segment and the end on the draw-off side of the nip does not get into the thread forming zone at all. After completion of the piecing process, the former thread end, which now forms this intermediate segment of the thread, arrives in the nip zone on the draw-off side during the draw-off movement of the thread, i.e., also after the thread end used for piecing has been fe
REFERENCES:
patent: 4514972 (1985-05-01), Stahlecker
patent: 4570430 (1986-02-01), Stahlecker
patent: 4586325 (1986-05-01), Wassenhoven
patent: 4598539 (1986-07-01), Stahlecker et al.
patent: 4606184 (1986-08-01), Stahlecker et al.
patent: 4617790 (1986-10-01), Stahlecker
patent: 4627230 (1986-12-01), Stahlecker
patent: 4628685 (1986-12-01), Stahlecker et al.
Hail III Joseph J.
Schubert & Salzer
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