Textiles: fiber preparation – Working – Drafting
Patent
1999-04-22
2000-05-09
Neas, Michael A.
Textiles: fiber preparation
Working
Drafting
19236, 19157, D01H 532
Patent
active
060585706
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a process and a device for recording a parameter on several slivers fed to a drawing frame.
U.S. Pat. No. 4,974,296, for example, discloses a drawing frame by which several incoming slivers made of textile fibres, which are drawn from a number of cans, are combined and drawn into a single homogeneous sliver. This drawing frame has a measuring device at the inlet, which is intended to detect variations in cross-section and mass in a number of slivers. This measuring device extends over all incoming slivers, registers all slivers jointly and outputs a single measured value for all slivers together.
Such known devices can detect a number of slivers together by capacitive means or scan them mechanically, for example, via pressure rollers. If pressure rollers are provided, the pressure exerted on the slivers is usually quite high in order to achieve accurate measured values. In this case the properties of the slivers have already been modified and combined so that the following drafting process is impaired. Where parameters are detected by capacitive means, the measurement is affected by moisture, for example. This can act externally on all slivers together, or it can affect individual slivers only, for example because these were exposed to more moisture in their cans prior to drawing than the other slivers. The known processes and devices therefore operate with rather inaccurate measured values or with slivers which have already been exposed to inadequate pretreatment.
As characterised in the claims, the object of the invention is therefore to create a process and a device of the above-mentioned type, that delivers a more accurate measured value and in so doing affects the slivers to the smallest possible extent.
The object is achieved in that parameters are measured separately on each sliver and then converted into a common measured value for several slivers.
For this the feed measuring device has several measuring elements individually assigned to slivers, all of said measuring devices being connected to a computer. The latter can provide a single measuring signal for the control process in the drawing frame, which is composed of the individual measured values output by the measuring devices. The measuring elements are located near exits of cans and are preferably part of a device for withdrawing the sliver from a can. Therefore, the distances between the measuring elements and the draw frame are different for each sliver, when cans are aligned in one row.
The particular advantages achieved by the invention are that the individual slivers have no mutual effect on each other during measurement and thus more accurate values of parameters measured at the incoming slivers are available. In this case the individual measuring elements can be made lighter so that they can respond very rapidly to parameter changes and these changes can also be rapidly and accurately output as a measured value. Measuring elements designed for mechanically scanning the sliver can also be used, although the sliver needs to be driven in the proximity of the measuring element. But, a sliver drive element anyway present at the exit of each can may perform that driving function. These more accurate values can be used in the control device of the drawing frame to effect more accurate control, which has an improved response to parameter fluctuations and which ultimately leads to a more uniform sliver at the output of the drawing frame, which more accurately corresponds to the setpoint for the parameter. It is also possible for the measuring elements to fulfill further functions, for example, where these monitor each individual sliver and trigger an indication, an alarm or another function in the case of particularly bad slivers.
The invention is explained in more detail below with the aid of an example and with reference to the accompanying drawings, of which:
FIGS. 1 and 4 each show a schematic representation of the construction of a controlled drawing frame with a feed measuring device,
FIG. 2 shows a measuring eleme
REFERENCES:
patent: 3184798 (1965-05-01), Burnet et al.
patent: 4266324 (1981-05-01), Hasegawa et al.
patent: 4974296 (1990-12-01), Vidler
patent: 5161284 (1992-11-01), Leifeld
patent: 5230125 (1993-07-01), Clement et al.
patent: 5248925 (1993-09-01), Jornot
patent: 5428870 (1995-07-01), Rutz et al.
patent: 5457851 (1995-10-01), Mondini
patent: 5487208 (1996-01-01), Hauner
Neas Michael A.
Welch Gary L.
Zellweger Luwa AG
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