Metal working – Method of mechanical manufacture – Roller making
Reexamination Certificate
1999-01-19
2001-09-18
Sewell, Paul T. (Department: 3726)
Metal working
Method of mechanical manufacture
Roller making
Reexamination Certificate
active
06289588
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a process for manufacturing a device for treating textile-fibers, preferably of wool, cotton, or fibers of natural as well as synthetic polymers. One example for a device of this kind is a card cylinder of ring-shaped configuration with an all-steel wire clothing, particularly an open-end clothing, as used in carding machines that particularly serve to improve the staple of raw fiber material, and another example are circular combs comprising wire sections on the outside, as used in combing machines that particularly serve to parallelize the individual fibers of fiber fleeces, where the saw-teeth of the all-steel clothing or, respectively, of at least the first of the wire sections of the circular combs are subjected to a hardening process.
2. Description of the Related Art
In the manufacture of ring-shaped card cylinders of the aforementioned kind, in order to avoid expensive single-piece configurations of a steel ring with a steel-tooth wire, it is customary to hold the steel-tooth wire in place by inserting its foot portion in a helicoidal groove that runs around the surface of the ring. In this, it has proven more advantageous to make the ring of aluminum rather than of steel, because with the use of aluminum, a secure anchoring of the wire is achieved by applying pressure in the vicinity of the groove. A problem arises, however, with the hardening of the teeth of the installed wires, e.g., through electrochemical plating, subsequent to the manufacture of the ring steel-wire unit.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a process by which card cylinders or circular combs of combing machines with comparatively longer useful life spans can be manufactured in a relatively simple manner while eliminating the aforementioned disadvantages.
With the aforementioned process, the essence of the solution is that the wires or the wire sections, while they are still separate units before being anchored on the ring or on the circular comb mounting support, after the customary blanking operation for cutting the teeth followed by through-hardening for increased tooth strength and electrochemical deburring, are pre-bent to conform to the curvature of the ring or circular comb mounting support, respectively, before they are subjected to a surface hardening process and finally anchored on the ring or circular comb mounting support. Card cylinders that are made in this manner have outstanding wear resistance of the sawtooth points even over comparatively long periods of use. The same applies to circular combs in which the leading first wire sections that suffer the greatest amount of stress can be subjected to a hardening process as separate components after they have undergone the pre-forming operation.
Following the operations of blanking, electrochemical deburring of the sawteeth, and pre-bending of the saw-toothed wire or wire sections to match the curved surface of the ring or the circular comb mounting support, it has proven to be particularly advantageous from a manufacturing point of view if, in accordance with the invention, the subsequent surface hardening process comprises a coating through the application of a diamond/Ni layer. In this, it is particularly beneficial if the wires are first subjected to a helicoidal pre-bending operation, then a surface hardening process of their saw-toothed portion, after which whey are installed on the ring.
In the inventive process, the best advantage from the helicoidal pre-bending of the saw-toothed wire is obtained if the latter, in its stress-free condition, has an internal diameter corresponding approximately to the- outside diameter of the cylindrical ring so that the saw-toothed wire coil will slide onto the cylindrical ring or otherwise can be installed by rolling it into the groove. The all-steel wire coil which thereby occurs as an intermediate product, so to speak, requires comparatively little space and is thus relatively convenient to handle for the subsequent installation on the ring that forms the body of the card cylinder.
If the saw-toothed wires used in the clothing are of the kind that has a foot and, issuing from the foot, a blade with a sequence of sawteeth, and if the cylindrical ring is provided on the outside with a helicoidal groove of a substantially rectangular cross-section that is delimited by two lateral walls and matched to the corresponding cross-section of the foot of the saw-toothed wire that is to be introduced into the groove, then it is very beneficial according to a further development of the invention, if at least one of the walls that laterally delimit the ring groove is deformed by a radial compressive force in such a manner that, after the foot has been introduced into the groove, ring material from the compressed domain of the wall is forced into a fluted recess that is provided in the flank of the foot and extends over the entire length of the saw-toothed wire. In this relatively simple manner, a secure mechanical coupling of the saw-toothed wire to the ring is accomplished.
As a further advantageous feature, for the first step of inserting the saw-toothed wire helix conveniently and securely into the groove of the ring, the process is distinguished in that on the side of the foot of the sawtoothed wire, a shoulder is formed to allow the application of a radial force for pressing the pre-shaped saw-toothed wire into the groove.
The invention is practiced with similar advantage in the case of a circular comb mounting support with several successive wire sections. Following its manufacture in a shape that matches the curvature of the circular comb mounting support, the leading wire section in the direction of combing, whose teeth are spaced farther apart than the teeth of the next as well as of the following sections, is mounted on the circular comb mounting support preferably by cementing, e.g., by means of a one- or two-component adhesive. This improvement of the first, leading section, is very beneficial in that it increases the useful life of the circular comb significantly, because all sections wear out at about the same time, at which point the entire comb will be exchanged.
REFERENCES:
patent: 5547709 (1996-08-01), Lukschandel et al.
patent: 2 149 591 (1973-03-01), None
patent: 2 048 323 (1980-12-01), None
patent: WO 91/15605 (1991-10-01), None
patent: WO 94/05837 (1994-03-01), None
Butler Marc
Darby & Darby
Graf & CIE AG
Sewell Paul T.
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