Controlling feed in a thread warping process and machine

Details Controlling feed in a thread warping process and machine Controlling feed in a thread warping process and machine

1996-10-17

1998-06-02

Falik, Andy

Textiles: manufacturing

Warp preparing or handling

Reeling or beaming

28195, D02H 300

Patent

active

057583951

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention is directed to a process and machine for warping threads on a warp drum by setting a preliminary feed speed for a warping reed and then plurally scanning the applied thickness of a warping wind to determine a corrected feed speed to be used thereafter, which feed speed depends upon the rotation of the warp drum and the thickness of the applied warping wind.
2. Description of Related Art
A process for warping threads onto a warping drum of a warping machine is disclosed in DE OS 3 702 293. In this process a warping reed is displaced relative to the warping drum in dependence upon the growing wind thickness. During the warping of the first band with predetermined warp thread feed, the wind diameter is measured by a tapping means during the at rest position of the warping drum. Furthermore, its adjusting path is measured during a winding measurement phase in dependence upon the number of revolutions of the warping drum. Thereafter, during the warping of the rest of the first warping band, and after the copying of the measuring wind during the warping of the following bands, the feed of the warp sled during the warping of the rest of the succeeding bands is corrected in accordance with the measured adjusting path.
Thereafter, during the warping of the first band before the warping of the measuring wind, a basis wind is warped with a predetermined warping sled feed and its winding diameter determined by a tapping means, whose adjusting path is measured in dependence upon the number of revolutions. Thereafter, the tapping means is adjusted in accordance with the measured adjusting path during the warping of the basis wind, and a predetermined corrected feed for the warping of the rest of the first band is determined from the difference between the measured adjusting path of the measuring wind and the measured adjusting path of the basis wind. All further warp bands like the first band are warped with reference to the basis and measured winds with the predetermined feed, and the remaining winds are warped with the corrected warp sled feed.
The disadvantage of the known process is that a stepped wind is formed as a result of the three part build up of the first warp band. There is a further disadvantage in that while the corrected feed value is already known, in the following winds, that is to say also with basis and measuring winds, one must wind with the originally prescribed warp sled feed in order to obtain the same buildup of all the subsequent warp bands.
German Patent DE 40 07 620 C2 discloses that the thickness of the applied windings may be determined by a laser beam distance measuring means, which is directed onto a pressure contact plate pressed onto the surface of the wind buildup.
Accordingly, there is a need for a process of warping threads on a warping drum in which a stepwise wind accumulation is avoided and wherein sequential warp bands can be wound with a singularly determined corrected warping reed feed.


SUMMARY OF THE INVENTION

In accordance with the illustrative embodiments demonstrating features and advantages of the present invention, there is provided a process for warping threads into a warp wind on a warping drum of a warping machine with a warping reed and an applied thickness measuring arrangement. The process includes the step of setting a preliminary feed speed for the warping reed, synchronized with the number of rotations of the warping drum. Another step is plurally scanning for applied thickness of the warp wind. The process also includes the step of setting a corrected feed speed for winding to completion, in dependence upon (i) the number of rotations of the warping drum, and (ii) the applied thickness obtained by the step of plurally scanning. The step of setting the corrected feed speed is performed by four steps. One of the steps is determining for a starting phase, a theoretically correct feed speed, as an initial value to be used within a first rotation of the warping drum. The theoretically correct fee

REFERENCES:
patent: 4974301 (1990-12-01), Beerli et al.
patent: 5107574 (1992-04-01), Beerli et al.
patent: 5410786 (1995-05-01), Bogucki-land

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