Textiles: fiber preparation – Working – Combing
Patent
1993-10-01
1995-04-11
Crowder, Clifford D.
Textiles: fiber preparation
Working
Combing
D01G 1922
Patent
active
054046190
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims the priorities of both PCT Application No. PCT/CH92/00238, filed Dec. 8, 1992, and Swiss Application No. 03 614/91-9, filed Dec. 9, 1991.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a combing machine having a plurality of combing heads, with every combing head including an apparatus for feeding one lap each to be combed, a device for combing out noils and a device for detaching combed fibre tufts from the laps and for forming a single head silver, and a guiding device for pneumatically carrying off the removed noils.
In such combing machines tile so-called comber waste or noils share is often determined. The terms comber waste share or comber waste percentage mean, for example, the ratio as expressed in per cent between the mass of the discharged comber waste and the mass of the supplied laps. Comber waste is the short fibres and some impurities removed from the fibrous material by the process of combing. On the basis of the determined comber waste share it is possible, if necessary, to correct certain settings in the combing machine itself or the machines which produce the laps to be supplied to the combing machine from the raw fibrous material.
2. Discussion of the Background of the Invention and Material Information
In known combing machines the machine is turned off for determining the comber waste share and the combing machine sliver, which is formed by single head slivers that are joined after a drafting arrangement, is detached (torn off). Thereafter a mesh flap is swivelled to the closed position in the guiding means which are used for the pneumatic discharge of the comber waste or a comber waste collection container is inserted. Thereafter the combing machine is put back into operation for a short period, e.g. 10 secs. Then the combing machine sliver is detached again and the detached combing machine sliver and the comber waste stored in the mesh flap or in the collection container are weighed and their ratio is compared with one another. This process is repeated two to three times and thereafter a mean value is established.
It is the object of the present invention to prevent the interruption of the operation and to avoid the considerable work and time which are required in known combing machines for determining the comber waste share.
SUMMARY OF THE INVENTION
This object is achieved in a combing machine having a plurality of combing heads, with every combing head including an apparatus for feeding one lap each to be combed, a device for combing out noils and a device for detaching combed fibre tufts from the laps and for forming a single head silver, a guiding device for pneumatically carrying off the removed noils; and a device for continuous or periodic generation of a signal representative of the comber waste share while the combing machine is in operation.
A display can be controlled with the signal representative of the comber waste share, on the basis of which the operating staff can decide when a setting in the combing machine and/or in one or several of the machines situated previously have to be changed. If desired, the signal can also control such changes directly automatically. Moreover, the signal can also be used to produce a shift log on the comber waste share in the combing machine automatically during a work shift.
The value of the signal representative of comber waste share A can be calculated in the device for producing said signal on the basis of two of the three values W=mass of the laps supplied per time unit, Z=mass of the single head slivers formed per time unit and K=mass of the comber waste carried off per time unit. As Z=W-K, this leads to A=K/W=(W-Z)/W=K/(Z+K). The said device preferably contains a measuring apparatus for determining the mass K of the comber waste carried off per time unit. In addition, the device may comprise means for supplying a signal representative of the mass of the single head slivers formed per time unit or, instead, means for measuring the
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International Application No. PCT/CH92/00238, Jun. 24, 1993.
Crowder Clifford D.
Izaguirre Ismael
Maschinenfabrik Rieter AG
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