Textiles: fiber preparation – Working – Drafting
Reexamination Certificate
2000-07-11
2001-10-02
Calvert, John J. (Department: 3765)
Textiles: fiber preparation
Working
Drafting
C019S157000
Reexamination Certificate
active
06295699
ABSTRACT:
This application claims the priority of German Application No. 199 08 371.1, filed Feb. 26, 1999, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to a draw frame for processing a fiber bundle composed of a plurality of slivers. The draw frame includes a creel, a measuring assembly and a draw unit. The slivers are introduced from the creel to the draw unit, then run therethrough while a measuring assembly disposed between the creel and the draw unit senses the thickness of the slivers. The measuring signals of the thickness sensor are used for regulating the draw frame. A sliver guide and a sliver trumpet are positioned downstream of the draw unit as viewed in the direction of sliver run.
The coiler cans containing the sliver to be introduced into the draw frame are conventionally arranged along one side or both sides of the creel. Above each coiler can a withdrawing device is arranged by means of which the sliver is pulled from the respective coiler can and is deflected in the direction of the draw frame. The slivers are advanced above the creel and are subsequently combined into a fiber bundle. The fiber bundle which is thus composed of a plurality of slivers is admitted into the draw unit after it passes a sensor. In the draw unit the slivers are stretched and doubled and are subsequently gathered in a sliver guide arranged at the outlet of the draw unit and then introduced into a sliver trumpet and combined into a single, stretched sliver for subsequent processing.
As described in German Offenlegungsschrift (application published without examination) 42 12 720, a storage belt is provided on which piles of slivers are positioned at several storage emplacements. Above the storage belt a conveyor belt is positioned which advances the slivers to the draw frame. Above each emplacement a pressing roll cooperates with the conveyor belt. The pressing rolls are preceded by deflecting guides which orient the sliver, taken from the emplacement, to the wedge-shaped gap provided between the pressing roll and the conveyor belt. The sliver removing device is essentially formed by the pressing rollers and the deflecting guides. Immediately upstream of the draw frame a driven deflecting roller cooperates with the conveyor belt. Further, immediately upstream of the draw frame a funnel-shaped densifier is provided which gathers the incoming slivers into a densified sliver bundle. An intake roll pair of the draw frame subsequently advances the sliver bundle to a roll pair which, as a measuring member, monitors the mass of the throughgoing sliver bundle by performing a mechanical mass measurement (thickness measurement). This is effected by passing the sufficiently densified sliver bundle through an intake funnel under a highly loaded floating pressure roll whose excursions are detected. Such excursions which represent the mass (thickness) variations of the sliver bundle, are converted into electric signals which, in turn, are used to regulate the draw unit. The drawn sliver discharged from the draw frame is deposited into a coiler can.
It is a disadvantage of the above-discussed conventional system that the fiber material is caused to change its running direction repeatedly from the time it is positioned on the conveyor belt until it is pulled off by the output rolls situated downstream of the draw unit of the draw frame. Each change of direction requires suitable structural elements and each such change involves frictional losses.
It is a further disadvantage that the configuration of the fiber material changes several times: in one phase it is advanced as separately running slivers and in another as a compressed sliver bundle which is then separated into individual slivers. These eventually emerge as the final, single, drawn output sliver. Thus, in the region of the draw unit the slivers are pressed between a pressure roll and a lower roll into a sliver bundle which, as known, subsequently again spreads into individual slivers and runs in this condition through the draw unit. At the output of the draw unit a sliver guide laterally gathers the individual slivers and combines them into the final output sliver. This procedure imparts to the slivers undesired structural changes, in addition to the earlier-noted directional changes.
It is yet another disadvantage of the conventional apparatus that it is of complex and expensive construction. Also, the multiple directional and shape changes adversely affect the output rate.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved apparatus of the above-outlined type from which the discussed disadvantages are eliminated and which, in particular, operates without affecting the fiber material in an undesired manner, which is structurally simple and makes possible a high output rate.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the draw frame for drawing a plurality of simultaneously running inputted slivers and for combining the drawn silvers into a single outputted sliver includes a draw unit having an inlet, an outlet and a roll assembly between the inlet and the outlet for drawing the inputted slivers; a creel for accommodating a sliver-containing coiler cans for advancing simultaneously a plurality of slivers to the draw unit; a sliver guide and a sliver trumpet arranged downstream of the draw unit outlet, as viewed in a direction of sliver run, for combining the plurality of drawn slivers into the output sliver; and a guiding assembly for orienting the running inputted slivers to run linearly and parallel to one another, as viewed in a vertical direction, from the creel at least to the outlet of the draw unit.
By virtue of the fact that from the creel at least up to and including the outlet end of the draw unit the fiber material is always in the form of individual slivers which preserve their direction of run, undesired structural changes, particularly frictional losses are avoided. The slivers run through the creel and the draw unit parallel to one another and practically do not change their direction whereby a significantly higher output rate may be obtained. In particular, a plurality of machine components causing the directional changes and the like are eliminated whereby significant simplifications are achieved as far as structure and installation are concerned. The essentially linear, parallel run of the slivers combined with the preservation of the sliver configuration makes possible to achieve the structural and functional advantages of the measures according to the invention.
The invention has the following additional advantageous features:
In the region of each coiler can a deflecting element is mounted on the creel and the deflecting element orients the slivers into a parallel arrangement.
The deflecting elements are offset as viewed parallel to the machine width.
The deflecting elements are driven rollers or the like.
The measuring assembly has, parallel to the machine width, a plurality of sensor elements for detecting thickness variations in each sliver, and the sensor elements are arranged parallel to one another.
The individual sensor elements mechanically detect thickness variations along the width at several locations and the sensor elements operate with sensor fingers.
At least one transducer is provided for converting the mechanical excursions into electric signals.
The slivers run essentially linearly and parallel to one another up to the sliver guide.
The slivers are in lateral contact with one another in the region of the creel.
The width of the sliver bundle on the creel, in the region of the measuring element and in the draw unit is essentially the same.
The slivers run in the same direction.
The slivers run in part above the creel beam.
The deflecting element is an annular eyelet structure which is rotatable in the radial direction.
REFERENCES:
patent: 576736 (1897-02-01), Threlfall et al.
patent: 2608725 (1952-09-01), Strew
patent: 3243853 (1966-0
Calvert John J.
Kelemen Gabor J.
Trutzschler GmbH & Co. KG
Venable
Welch Gary L.
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