Gas separation – With inflow gas control or distribution
Reexamination Certificate
1999-02-19
2001-03-06
Simmons, David A. (Department: 1724)
Gas separation
With inflow gas control or distribution
C019S105000, C406S171000, C406S172000
Reexamination Certificate
active
06197080
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application claims the priority of German Application No. 198 06 891.3 filed Feb. 19, 1998, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to an apparatus for separating fiber material from a conveying air stream and advancing the fiber material to a fiber processing machine. The apparatus includes a substantially vertical feed chute having an upper, fiber inlet portion provided with a pneumatic fiber supply device having a stationary, air pervious screen for separating the fiber material from the conveying air stream which, stripped of the fiber material, is guided away from the feed chute.
In a known apparatus of the above type the air pervious screen is a horizontally arranged, downwardly open, semi-cylindrical shell and the intake channel which delivers the fiber-laden air stream into the feed chute merges into the feed chute with a tangential orientation toward the screen. The intake channel is connected to a fiber conveying fan, and the open outlet of the semi-cylindrical shell merges in the inlet opening of the feed chute. The fiber-laden air stream is guided along the inner cylindrical wall face of the screen, and then the fiber material drops into the feed chute. In order to increase the impact effect and thus ameliorate the dust removal from the mixture of fiber tufts and air, the power of the air stream may be increased by suitably adjusting the output of the fiber conveying fan. Such a procedure, however, has the disadvantage that the powerful air stream causes the fiber tufts to adhere to the inside face of the screen and thus accumulate there, clogging the screen and interfering with a proper fiber flow into the feed chute.
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 disadvantage is eliminated, and in which particularly the degree of cleaning of the fiber tufts and dust removal therefrom are significantly increased, and furthermore, operational disturbances are avoided.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the apparatus for separating fiber tufts from a fiber tuft-laden conveying air stream includes a generally vertically oriented feed chute having an upper portion and a lower portion; an air-pervious screen disposed in the upper chute portion; an inlet channel having an outlet opening in the upper chute portion for introducing the fiber tuft-laden conveying air stream into the upper chute portion and for directing the fiber tuft-laden conveying air stream toward the inner face of the screen for effecting an impingement of the fiber tufts on the screen and a passage of the air stream, stripped of the fiber tufts, through the screen; and a mechanism disposed in the upper chute portion adjacent the inner screen face for effecting a sweeping motion of the fiber tuft-laden conveying air stream back and forth over the inner screen face for removing a pressing force of the air stream on the fiber tufts adhering against the inner face of the screen, whereby the fiber tufts fall off the inner screen face by gravity toward the lower chute portion.
Thus, the apparatus according to the invention effects a back-and-forth oscillation of the fiber-laden air stream over the inner surface of the air-previous screen in the upper portion of the feed chute. As a result, despite the powerful impacting of the fiber tufts on the screen, an accumulation of the fiber tufts on the inner screen surface is prevented; rather, after the fiber tufts hit the screen and particularly after the air stream moves laterally away therefrom as the sweeping effect continues, the fiber tufts fall off the screen by gravity and travel downward in the vertical feed chute.
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Hopkins Robert A.
Kelemen Gabor J.
Simmons David A.
Trutzschler GmbH & Co. KG
Venable
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