Yarn winding method

Details Yarn winding method Yarn winding method

1993-12-14

1996-06-18

Stodola, Daniel P.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 18A, B65H 5402, B65H 67044

Patent

active

055269958

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a yarn winding apparatus of the type having a rotatable turret or revolver which mounts a pair of winding spindles, and wherein the spindles are serially delivered to a winding position and a doffing position as the revolver is sequentially rotated.
Winding machines of the above-described type commonly employ a contact roll which is positioned to rest upon the package being formed on the spindle at the winding position. Also, designs are known wherein the revolver is rotated to provide relative movement between the contact roll and the winding spindle as the package diameter builds, note for example, EP-A 374536 and corresponding U.S. Pat. No. 5,029,762.
In such a yarn winding apparatus, it is necessary, at the end of a winding cycle, to remove the full packages from the idle spindle and to replace them with new empty tubes, since the yarn advances continuously.
A compact type of construction is attempted for the package revolver. This means that the two winding spindles are to be brought together as closely as possible. As a result, there is the risk that the rapidly increasing package enlarges toward the fully wound, yet to be doffed package and destroys the winding head.
On the other hand, a certain doffing time is required to remove the full packages and to insert empty tubes onto the doffed winding spindles.
It is the object of the present invention to provide a method, in which an adequate doffing time is always available, despite the narrow spacing between the winding spindles, for replacing the full packages with empty tubes.


SUMMARY OF THE PRESENT INVENTION

The above and other objects and advantages of the present invention are achieved in the embodiments illustrated herein by the provision of a method which comprises the steps of providing a revolver which is rotatable about a central axis and which rotatably mounts two spindles which are rotatable about respective axes which are parallel to the central axis and with the two spindles being equally spaced about the periphery of the revolver, and rotating the revolver so as to alternately move the spindles between the winding position and a doffing position. The method includes the further steps of (a) winding the advancing yarn onto a rotating empty bobbin tube which is positioned coaxially upon one of the spindles which is positioned at the winding position, while rotating the revolver about the central axis so that the one spindle moves from the winding position and defines an angular winding range during which a full yarn package is formed on the bobbin tube, (b) donning an empty bobbin tube coaxially upon the other of the two spindles while the one spindle is within the winding range, then (c) rotating the revolver so that the one spindle and the full package move to the doffing position and the other spindle and the donned empty bobbin tube move to the winding position, and then stopping the revolver, (d) transferring the advancing yarn from the full package to the donned empty bobbin tube which is positioned at the winding position, and (e) doffing the full package from the one spindle while the revolver is stopped with the full package at the doffing position, and (f) cyclically repeating steps (a) through (e).
In a preferred embodiment, step (b) includes stopping the revolver at a second stopping position which is angularly spaced from the doffing position by a sector angle which is less than the winding range, and donning an empty bobbin tube coaxially upon the other of the spindles while the revolver is in the second stopping position. Further, the second stopping position is at a location wherein the one spindle is at least about at the mid-point of the winding range.
From the invention, there results the advantage that the time necessary for the exchange of full packages and empty bobbin tubes is divided into two time periods.
The first time period is very short, since during this time period it is necessary to only push the full packages from the idle spindle. The device

REFERENCES:
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patent: 3901456 (1975-08-01), Pradier
patent: 3964723 (1976-06-01), Schippers et al.
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patent: 3999715 (1976-12-01), Schippers et al.
patent: 4014476 (1977-03-01), Turk et al.
patent: 4305551 (1981-12-01), Cockshott et al.
patent: 5029762 (1991-07-01), Behrens et al.
patent: 5228630 (1993-07-01), Nakai et al.
patent: 5234173 (1993-08-01), Nishikawa et al.

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