Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1997-02-11
1998-07-14
Stryjewski, William
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 18A, 242 18R, 242 355T, 242534, B65H 5402
Patent
active
057791708
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a yarn winding method and apparatus of the type having a rotatable turret or revolver which mounts a pair of winding spindles, and wherein the winding spindles are alternately moved between a winding range and a doffing range as the revolver is sequentially rotated.
Such a method and an apparatus for carrying out the method are known from WO 93/17949 and corresponding U.S. Pat. No. 5,526,995. The known apparatus comprises a spindle revolver mounting two winding spindles, which are moved by the rotation of the spindle revolver alternately to a winding range and to a doffing range. In the doffing range, the full packages are pushed off, on the one hand, and subsequently empty tubes are slipped onto the emptied winding spindle.
Furthermore, for a clear distinction between the two winding spindles, the winding spindle being in the winding range is described as the operating spindle, and the winding spindle being in the doffing range is referred to as the idle spindle.
In a winding machine as known from EP 0 374 536B and corresponding U.S. Pat. No. 5,029,762, the full packages are removed from the idle spindle at the end of a winding cycle, and exchanged for empty tubes, since the yarn advances thereto continuously. To perform the package doff, the takeup machine is equipped with a servicing automat or doffer, such as is known, for example, from the Barmag AG Brochures Aut 14(d) "Doffer WD 5" or Aut 15(d) "Doffer WD9". Such a servicing automat is provided with a package mandrel for receiving the finished spinning packages from the idle spindle, and a second mandrel for supplying the emptied winding spindle with new empty tubes.
Since the winding spindles are arranged relatively close together as a result of the compact construction of such takeup machines, and since at the now common high takeup speeds, the winding packages on the operating spindle enlarge very quickly toward the non-doffed packages at the doffing range, the package doffs must follow each other very quickly. This is particularly true when winding yarns of more coarse denier, such as carpet yarn.
In the known winding machine as described in U.S. Pat. No. 5,029,762, the surface of the package being formed is engaged by a contact roll, which is mounted for limited movement in a radial direction away from the spindle upon which the package is mounted, and a sensor is provided for sensing such movement and rotating the revolver by means of a stepping motor so as to move the package along the winding range. This, again, results in that the full package on the idle spindle is further rotated, even during the doffing operation and, thus, moves out of alignment with the axis of the package mandrel that is arranged on the doffer for receiving the full packages.
Accordingly, only a limited parking time is available for the package doff, whereas the removal of the full packages and the replacement of the empty tubes takes a minimum doffing time. In this connection, it is necessary to observe that the package mandrel provided on the doffer for receiving the full packages and the mandrel for slipping on the empty tubes be in alignment with the winding spindle during the package doff.
In the takeup machine described in the aforesaid publication WO 93/17949, the object of providing an adequate time for exchanging the full packages for empty tubes despite the small spacing between winding spindles, is achieved by a method, which provides in the doffing range for two defined stopping positions and for a package doff in two stages. Such an operation is a considerable improvement over the previously known method. The lengthening of the doffing times, thus, lessens the problems with doffing packages during a continuous winding of synthetic filament yarns with textile and industrial filament deniers.
It is therefore the object of the invention to further develop the method of doffing packages such that the package doff occurs no longer in accordance with a rigid flow pattern, but is made more flexible wit
REFERENCES:
patent: 3921922 (1975-11-01), Wust
patent: 4023743 (1977-05-01), Schippers
patent: 4340187 (1982-07-01), Schippers et al.
patent: 4441660 (1984-04-01), Cloud et al.
patent: 5029762 (1991-07-01), Behrens et al.
patent: 5393003 (1995-02-01), Watermann
patent: 5526995 (1996-06-01), Westrich et al.
patent: 5568720 (1996-10-01), Teich et al.
Barmag AG, Aut 14(d), Doffer WD5, 4 pages.
Barmag AG, Aut 15(d), Doffer WD9, 2 pages.
Fink Wolfgang
Gsell Jurgen
Siepmann Peter
Westrich Hermann
Barmag AG
Stryjewski William
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