Textiles: spinning – twisting – and twining – Apparatus and processes – With drafting
Patent
1993-12-13
1997-11-25
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
With drafting
19150, 19288, 57261, 57279, 57280, 57328, D01H 528, D01H 1304
Patent
active
056899459
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a drafting arrangement for a fine spinning frame, in particular a jet spinning machine.
STATE OF THE ART
The apron drafting systems for fine spinning frames consist of several continuous steel or bottom rollers and a drafting arm for every spinning position, to which arm the spring-loaded top rollers are attached. Such drafting arrangements are known, for example, from the book by Dr. W. Wegener "Die Streckwerke der Spinnereimaschinen" ("Drafting Arrangements of Spinning Machines" Edition 1965, Springer Verlag). An example of such a weighting arm is shown in DE-A-30 25 032. Drafting frame arrangements which were specially designed for jet spinning have been disclosed in U.S. Pat. No. 4,718,225 and U.S. 5,038,553.
During the renewed piecing to a yarn end of a broken yarn, with the yarn end being guided back, for example, through the spinning nozzles of a jet spinning machine and then guided past the drafting arrangement in the manner as is described in DE-A-37 06 728, the yarn section which is guided back is to be guided into the nip line of the rotation pair of output rollers. This so-called depositing of the yarn section should be carried out to the utmost extent in a smooth sequence, so that the yarn end is securely and timely moved to the center of the nip line of the output rollers.
In contrast to the depositing method, which is used in accordance with DE 39 32 666 for example during the piecing in a ring spinning machine, the yarn in a jet spinning machine extends through the nozzle before the depositing, which nozzle is provided with an orifice in or on the nip of the pair of delivery rollers (also known as pair of output rollers). Therefore it is very difficult to keep the yarn in a suitable standby position before the depositing without touching the one or the other rapidly rotating delivery roller. Such a contact is acceptable in ring spinning (cf. DE 39 32 666, FIG. 3). However, in jet spinning (with a substantially higher delivery speed) this is not acceptable.
It is known (e.g., according to DE GBM 18 65 440) to form a roller with conical end sections in order to reduce the lap tendency. This, however, does not have anything to do with the problems relating to renewed piecing.
SUMMARY OF THE INVENTION
The invention now has the object of improving a drafting arrangement of the type mentioned above in such a way that a secure and timely depositing of the yarn section is ensured.
The invention has the further object of improving the renewed piecing (in particular that of a jet spinning machine) with respect to the known methods.
The invention has the advantage that by using simple and inexpensive means it is achieved that the yarn can be held at a suitable standby position before the depositing, thus ensuring the secure and timely depositing of the yarn section. Further advantages arise from the description below in which the invention is outlined in greater detail by reference to the embodiments shown in the Figures, in which:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an arrangement of a nozzle body with respect to the output rollers of an apron drafting arrangement;
FIG. 2 shows the same arrangement as in FIG. 1 from direction A;
FIG. 3 shows a section through the pressure roller;
FIG. 4 schematically shows a spinning position (including a winder unit) of a jet spinning machine;
FIG. 5 schematically shows the main draft zone of the drafting arrangement of FIG. 1, in combination with a yarn handling device situated in a standby position;
FIG. 6 shows the arrangement in accordance with FIG. 5 as seen in the direction of arrow B;
FIG. 7 shows the arrangement of FIG. 5 shortly after initiation of the yarn depositing movement;
FIG. 8 shows the arrangement shown in FIG. 7 in the direction of arrow B;
FIG. 9 shows the arrangement in accordance with FIG. 5 after the conclusion of the yarn depositing movement;
FIG. 10 shows the arrangement shown in FIG. 9 as seen in the direction of arrow B; and
FIGS. 11 to 16 show three further
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Debrunner Reto
Tobler Martin
Witschi Martin
Maschinenfabrik Rieter AG
Stryjewski William
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