Textiles: fiber preparation – Working – Carding
Reexamination Certificate
2000-01-06
2001-02-13
Calvert, John J. (Department: 3741)
Textiles: fiber preparation
Working
Carding
C019S098000, C019S10600R
Reexamination Certificate
active
06185788
ABSTRACT:
The present invention relates to machines for carding of textile fibres, in which the flock fibres are worked in order to produce a web of fibres. In this operation, the short fibres and tangles are removed from the fibres, which are stretched and rendered parallel in a web of fibres which is disposed on the covering of the drum of the carder, from which the web of fibres is collected by means of a rotary detachment cylinder, correctly known as a doffer, which is provided with a suitable covering, and is then passed from a subsequent detachment cylinder to a compactor unit and to a drawing unit, in order to produce a strip of fibres.
More particularly, the present invention relates to a method and a device, in which the web which has been detached from the carder by the doffer is then collected by the detachment cylinder, and is supplied downstream to a unit for compacting of the web into a strip, and controlled drawing.
In order to make more apparent the technical aspects and the problems involved in carding, reference is made to a drawing of the sequence of the carder drum, the doffer, the detachment cylinder and the compactor, illustrated in
FIG. 1
, in a schematic lateral view.
Downstream from the main drum of the carder
1
, the doffer of the carder is indicated as
2
, and on the latter the web of fibres
3
is brought to the detachment cylinder
4
, and is conveyed to the compactor unit, consisting of a pair of smooth, rotary web-presser cylinders
5
,
6
with a substantially horizontal axis, which compact the web
3
, which still has a transverse dimension corresponding to that of the carder, and transfer the web to a subsequent belt conveyor
7
with a vertical work surface, which compacts the web into a strip. The compactor unit operates at a speed which is compatible with that of the web
3
obtained from the detachment cylinder
4
. The two web-presser cylinders
5
and
6
are rotated at a linear speed which is the same as one another, thus preventing friction against one another. The drawn strip is then conveyed for collection in a container, for subsequent processing operations. Above the detachment cylinder
4
, there is disposed a device for cleaning the covering of the latter, consisting of a rotary brush
8
.
The diagram described hitherto substantially concentrates all the work on the web of fibres on the covered surfaces of the main carder drum
1
, and of the supply cylinder or briseur which proceeds this drum, and is not shown in
FIG. 1
for the sake of simplicity.
The carding action consists of stretching the fibres and rendering them parallel, and removing from them impurities which cannot be woven, which are commonly known as trash, by the effect of opposition of the covered surfaces of the briseur and of the carder drum
1
, which rotate at a high speed, relative to the coverings of the mobile crossheads and other fixed components, such as separator blades, carding plates, and suction nozzles. These cleaning means operate on the entire generatrix of these drums, which corresponds to the width of the web
3
. The various drums and cylinders of the carder are enclosed in retention plates which are suitably connected and are commonly known as guards or “aprons”, in order to restrain the fibres and convey them, making them continue to adhere to the tips of the coverings of the said cylinders. The said restraint is interrupted only at the cleaning means, in order to permit controlled removal of the impurities extracted from the fibres.
When the web of fibres leaves the surface of the carder drum
1
, as a result of the action of the doffer
2
, there is no longer any substantial action of cleaning of the web. In the web thus produced, there remain substantial quantities of small impurities, known as micro-impurities or micro-particles, which are the most difficult to separate since they are buried in the innermost layer of the web of fibres on the covered drums, and are protected against the action of the fixed cleaning components.
These residual micro-impurities thus remain in the web, and therefore in the strip, and finally in the yarn produced, in which they are clearly visible, and detract from the quality of the product. In the operations of dyeing the yarn, the presence of the micro-particles is very detrimental in terms of local variation of absorption of the dye, and provides a product with a colour which is not regular, and generally is not well accepted.
The object of the present invention is to carry out discharge and cleaning of the web of fibres produced by a carder, with control and reduction of the content of these micro-impurities.
The present invention consists of a device and a method for discharge and cleaning of the web produced by a carder. The salient characteristics of the device for discharge and cleaning are defined as well as its preferred embodiments. The salient characteristics of the method are defined as well as its preferred embodiments.
REFERENCES:
patent: 3235911 (1966-02-01), Reiterer
patent: 4221022 (1980-09-01), Iida
patent: 4274178 (1981-06-01), Hotta
patent: 4299011 (1981-11-01), Rothen et al.
patent: 4332058 (1982-06-01), Warnock
patent: 4352223 (1982-10-01), Felix et al.
patent: 4374448 (1983-02-01), Loffler
patent: 5522119 (1996-06-01), Leifeld et al.
U.S. Ser. No. 09/579,132, filed Jan. 6, 2000, pending.
U.S. Ser. No. 09/579,132, filed May 30, 2000, pending.
Pasini Giovanni Battista
Patelli Silvano
Calvert John J.
Marzoli S.p.A.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Welch Gary L.
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