Textiles: fiber preparation – Working – Carding
Reexamination Certificate
1999-05-04
2001-02-13
Worrell, Danny (Department: 3741)
Textiles: fiber preparation
Working
Carding
C019S098000
Reexamination Certificate
active
06185789
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to metallic clothing with teeth having a serrated side portions for use on carding elements.
Carding flats and stationary carding segments are generally used in carding machines about the main carding cylinder and produce a carding interface therebetween. Carding flats may also remove trash and non-spinnable fibers during carding. Conventional carding flats often involve the use of flexible wire clothing, which is attached to the flats themselves via adhesive, or some other fastening means. The flexible clothing is produced by providing a flexible substrate, which could be fabric, rubber, plastic, leather, or some combination thereof. The wire clothing is essentially “stapled” through the substrate. After the staples have been inserted through the substrate, the ends of the staples, i.e., the “wires,” are subsequently bent at a forward angle and are ground to produce a desired profile.
Production of flexible clothing is relatively labor-intensive and expensive because of the required bending and grinding of the wires after their insertion through the substrate.
Metallic clothing is also known. Metallic clothing does not require a pliable substrate as does flexible clothing, but instead is comprised of a series of wire segments which are stacked side-by-side against each one another in a channel formed in an elongated holder. This holder can be produced of a material such as plastic, or some other material, and is subsequently attached to the flat or carding segment itself via adhesive, clips, or some other fastening means. The advantages of metallic wire clothing are that it is easier to produce and offers longer life. However, in certain applications metallic clothing may Lend to not remove trash and non-spinnable fibers as well as does conventional flexible card clothing.
Accordingly, there exists a need for metallic clothing having an improved ability to remove trash and non-spinnable fibers.
As to other carding elements such as carding cylinders, lickerin rolls, doffer rolls, etc, which already typically use a metallic wire, there exists a need for improved carding wire which will increase carding efficiency.
SUMMARY OF THE INVENTION
It is, therefore, the principal object of this invention to provide metallic clothing for carding elements such as carding rolls, carding segments and flats which offers improved carding of fibers.
Another object of the present invention is to provide metallic clothing for carding segments and flats which offers both improved manufacturability and durability, and also, an improved ability to remove trash and non-spinnable fibers during carding.
Generally, one embodiment of the present invention includes metallic clothing having metallic wire teeth bent at a double angle. The lower portion of each tooth is angled by an first angle with respect to vertical, and the upper portion is angled at a second angle with respect to vertical. The upper portion terminates at the tip, or point, of the tooth. This double-angle tooth profile is angled in the direction opposite to the general direction of travel of fibers being carded. The upper side portion of each tooth is tapered inwardly to the tip, and the rear edge of the upper end of each tooth may be provided with a forward curvature towards the point of the tooth. Additionally, the teeth of the present invention may be of generally taller height than that of conventional metallic clothing teeth.
The present invention further includes metallic clothing having wire teeth bent at a double angle, wherein the base portion of the wire clothing is taller than the embodiment discussed above and comprises approximately one-half the height of the overall height of the clothing, with the height of the teeth comprising the balance of the height of the metallic clothing.
Moreover, the present invention includes metallic clothing wherein the teeth are at a single angle, and wherein the height of the base portion of the wire clothing is substantially half the height of the clothing, with the height of the teeth making up the balance of the clothing's height.
Additionally, the present invention includes metallic clothing wherein the teeth are serrated on one or both sides and further, wherein the teeth include double lateral angle portions, with the first lateral angle portion extending upwardly towards the tip of the tooth and joining a second lateral angle portion terminating at the tip of the tooth.
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Cannon Heyward O.
Hollingsworth John D.
John D. Hollingsworth on Wheels, Inc.
Leatherwood Walker Todd & Mann, P.C.
Worrell Danny
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