Textiles: manufacturing – Warp preparing or handling – Machine replenishing
Reexamination Certificate
2000-06-30
2001-09-04
Falik, Andy (Department: 3765)
Textiles: manufacturing
Warp preparing or handling
Machine replenishing
Reexamination Certificate
active
06282765
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method and a device for aligning eyelets of harness elements for weaving machines.
Such devices and methods are known mainly for the centering of the eyelets of healds which are used in weaving machines. The centering of the eyelet is important when a thread is to be drawn in through the eyelet, since this takes place, for example, by means of drawing-in devices which shoot a drawing-in needle with a warp thread through the eyelet at high speed. If contact occurs between the eyelet and the drawing-in needle, the heald can be damaged, or the drawing-in operation can easily be disrupted. However, the drawing-in operation normally takes place outside the weaving machine.
From EP 0 500 848 it is known, on the one hand, to align such eyelets only laterally from the outside and, on the other hand, to adjust the longitudinal position or the height of the eyelet via eyes which are provided at the ends of such harness elements. These eyes serve the purpose of carrying or hooking in the harness elements, such as healds. This also means that, in the weaving machine, the harness elements are moved or driven in their longitudinal direction via such eyes. In the weaving machine, the eyes are therefore subjected to forces which can deform them and wear them away, this occurring more severely the more frequently the harness element is moved.
Since, however, the position of the eyelet is determined only indirectly via the position of the lateral limit or the inner edge of the eye, the position of the eyelet in the longitudinal direction nevertheless changes with the degree of wear of the eve In this case, repositioning by known means is not possible.
SUMMARY OF THE INVENTION
The invention, as it is characterized in the patent claims, accordingly achieves the object of providing a method and a device which permit the position of an eyelet in a harness element to be detected more accurately and, if necessary, corrected.
The above object and others are accomplished by the invention in that the position of the eyelet is in fact detected, and that the position is corrected as a result of the detected position of the eyelet, by the harness element being displaced in its longitudinal direction. In the process, the position of the eyelet transverse to its longitudinal direction is predefined from the outside by a guide for the harness element. The position of the eyelet, seen in the longitudinal direction of the harness element, can be detected or sensed optically or mechanically. The correction is triggered by discrete signals. In the case of the device according to the invention, a sensor, which can be connected in and passes through the plane of the eyelet, is provided. The sensor can be designed as a mandrel, which is arranged on a carriage so that it can move transversely with respect to the eyelet, or as a light barrier, which is arranged transversely with respect to the eyelet and is designed so that it can be connected in. Furthermore, the sensor is assigned a mechanical guide, which can be connected in, for the harness element and a device for displacing the harness element in its longitudinal direction.
The advantages which are achieved by means of the invention are to be seen in the fact that, in general, healds or harness elements which are in a poor condition can thus be detected. This can even be done when there is no large-scale damage but just an eye with a cross-section widened as a result of wear. Hence, such harness elements can be separated out at an early stage and outside the weaving machine, which avoids interruptions in operation. Since, then, the drawing-in device no longer has any contact with the eyelets of the harness elements, it is not adversely affected either.
REFERENCES:
patent: 2828527 (1958-04-01), Meierhofer
patent: 4038729 (1977-08-01), Townsend
patent: 4499638 (1985-02-01), John et al.
patent: 5111560 (1992-05-01), Sato
patent: 5826315 (1998-10-01), Kuroyanagi
patent: 92/05303 (1992-04-01), None
Schâpper Walter
Wolf Markus
Falik Andy
Kelemen Gabor J.
Stäubli AG Pfäffikon
Venable
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