Textiles: fiber preparation – Working – Carding
Reexamination Certificate
2001-04-12
2001-11-13
Calvert, John J. (Department: 3765)
Textiles: fiber preparation
Working
Carding
C019S107000, C019S111000
Reexamination Certificate
active
06314620
ABSTRACT:
This application claims the priority of German Application No. 199 63 082.8 filed Dec. 24, 1999, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to a device for cleaning traveling flat bars circulating in a carding machine. The flat bars are mounted on an endless carrier supported on end sprockets which periodically reverse the direction of travel of the flat bars. At least at one region of reversal a chamber-like suction device is arranged which is coupled to a suction source and has a suction opening.
In a known apparatus, as described in European Patent No. 0 366 948, to which corresponds U.S. Pat. No. 4,945,609, at one location of reversal, coaxially with the center of curvature, an elongated suction pipe is provided which is situated between the two end sprockets and extends along the width of the carding machine, that is, along the length of the traveling flats. At one end face the suction pipe terminates in a flange to be coupled to a suction source. A suction slot is provided in the suction pipe along the entire length thereof.
The above-outlined prior art construction has the following disadvantages:
The sole suction slot has only a slight suction effect. Further, the suction pipe is an additional structural component which is difficult to install in the zone of reversal where the sprocket drive shaft is positioned, thus rendering the apparatus complex and expensive. To avoid undesired air flows and to reduce the air consumption, additional measures are required such as the provision of sealing lips mounted on the back of the flat bars for sliding on the suction pipe. Also, the coupling to the suction source must be guided around the traveling flats sprockets.
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, is simple to construct and assemble and results in a better cleaning efficiency.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the carding machine includes a traveling flats assembly which has a plurality of flat bars traveling in an endless path. The flat bars are spaced from one another in a travel direction thereof. First and second end rolls periodically reverse the travel direction of each flat bar. At any time a plurality of flat bars are situated in a circular array on each end roll for being carried in a circular path thereby. First and second drive shafts carry and rotate the respective first and second end rolls. An apparatus for cleaning the flat bars is arranged in a region of at least the first end roll. The apparatus includes a throughgoing, eccentric aperture provided in a radial wall of the first end roll. At any time at least two mutually adjoining flat bars, situated on the first end roll, are aligned at least partially with the aperture. A suction inlet adjoins the radial wall of the first end roll for being periodically brought into alignment with the throughgoing aperture upon rotation of the first end roll. A suction chamber is formed by a space bounded by the adjoining flat bars and a peripheral surface of the first drive shaft.
By providing a vacuum chamber formed by adjoining outer surfaces of the flat bars and the drive shaft, that is, already existing structural elements are being utilized, the structural and mounting outlay is significantly reduced as compared to prior art arrangements. A suction chamber provided in this manner has a small cross section whereby a higher flow velocity is achieved which, in turn, leads to an increased cleaning effect. The suction source may be arranged without spatial problems at the outer side of the end sprocket and may draw air in this manner through the suction openings. Further, advantageously, the tooth gaps of the end sprocket may be exposed to a suction stream and may thus be cleaned.
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Leder Armin
Pferdmenges Gerd
Calvert John J.
Kelemen Gabor J.
Trutzschler GmbH & Co. KG
Venable
Welch Gary L.
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