Weighing scales – Weigher responsive material control – Feed
Reexamination Certificate
1999-03-15
2001-05-22
Gibson, Randy W. (Department: 2859)
Weighing scales
Weigher responsive material control
Feed
C177S121000, C019S105000
Reexamination Certificate
active
06235999
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an apparatus for advancing and weighing textile fibers, particularly cotton and chemical fibers wherein two feed chutes are serially superpositioned above a weighing container and are charged with fiber material. The upper feed chute has a bottom opening in which a slowly rotating withdrawing roll is disposed which cooperates with a counterelement, while the lower feed chute has a bottom opening controlled by a gate. A rapidly rotating opening roll is arranged downstream of the withdrawing roll and the counterelement, as viewed in the direction of fiber advance.
In a known apparatus the upper feed chute is closed off at its lower end by two slowly rotating withdrawing rolls, and a rapidly rotating opening roll is arranged downstream of the withdrawing rolls. The lower feed chute is charged with fiber by means of the two withdrawing rolls and the after-connected opening roll. It is a disadvantage of such a prior art apparatus that the nip between the two withdrawing rolls has an appreciable distance from the opening roll. The rapidly rotating opening roll tears the slowly advancing fiber material from the nip. Due to the remoteness of the nip from the opening roll, only the relatively long fibers are caught by the opening roll and thus only appreciably coarse fiber tufts are formed. As a result, the metering accuracy of the apparatus is limited. It is a further drawback that the use of two withdrawing rolls is structurally and systemwise complex.
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, which is structurally simple and which makes possible an improved metering accuracy for the fiber material.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the apparatus for feeding and weighing textile fibers includes a weighing scale container having an open end chargeable with fiber material; an upper feed chute having an upper end chargeable with fiber material and a lower end; a withdrawing roll obturating the lower end; a first drive for slowly rotating the withdrawing roll; a feed tray cooperating with the withdrawing roll and defining a nip into which fiber material is drawn from the upper feed chute and from which the fiber material is discharged; an opening roll arranged immediately at the nip for receiving the fiber material discharged from the nip; a second drive for rapidly rotating the opening roll for tearing fiber material from the nip and for opening and discharging the fiber material; a lower feed chute having an upper end receiving fiber material discharged from the opening roll and a lower end; a movable shutoff gate situated at the lower end of the lower feed chute for opening and closing the lower feed chute; and a third drive for moving the shutoff gate.
The sole withdrawing roll provided at the lower end of the upper feed chute according to the invention serves a dual function: it withdraws the fiber material from the upper feed chute and—in cooperation with the feed tray—functions as a feed roll for advancing fiber material to the opening roll. The use of an apparatus which has only a single withdrawing roll cooperating with a feed tray and functioning both as a fiber withdrawing device and a fiber feeding device is structurally simple. The outlet side of the nip between the feed roll and the feed tray is arranged in the immediate vicinity of the opening roll. As a result, even short fibers may be clamped and caught by the opening roll and thus small fiber quantities are caught and opened by the opening roll which means that the latter is capable of forming small fiber tufts. Small fiber tufts improve the accuracy of the metering and thus a more accurate weighing may be achieved and a greater overall precision of the apparatus may be achieved.
The invention has the following additional advantageous features:
The direction of rotation of the withdrawing roll is reversible, whereby a reversible intake is possible for avoiding an “after-run”, that is, when the withdrawing roll is stopped, the opening roll does not continue to tear fiber material from the nip.
In operation the directions of rotation of the withdrawing roll and the opening roll are oppositely oriented so that adjoining regions of the rolls move codirectionally.
The opening roll is provided with pins between which gaps are present as viewed axially. Such an arrangement reduces the entrained air stream.
The opening roll has a circumferential speed of approximately 400-600 m/sec. This measure further decreases the entrained air stream.
The opening roll has a diameter of approximately 200-300 mm. This arrangement may further decrease the entrained air stream so that a swirling of the fiber material taken from the withdrawing roll by the opening roll is avoided.
The circumferential speed of the withdrawing roll is adjustable. For such a purpose an rpm-controlled drive motor such as a servomotor may be provided which is connected to an electronic control and regulating device such as a microcomputer.
For providing a fiber mixture, a plurality of devices according to the invention are provided.
In the weighing container different fiber types are introduced.
The feed tray cooperating with the withdrawing roll is stationary.
The feed roll cooperating with the withdrawing roll is radially movable and is, for example, spring loaded.
The nip width between the withdrawing roll and the feed table is adjustable.
The withdrawing roll has a clothing.
The withdrawing roll has a circumferential speed of 1-2 m/min.
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Gibson Randy W.
Kelemen Gabor J.
Trutzschler GmbH & Co. KG
Venable
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