Textiles: weaving – Weft manipulation – Lays or beat-ups
Patent
1996-09-10
1998-06-09
Falik, Andy
Textiles: weaving
Weft manipulation
Lays or beat-ups
427577, 428216, 428469, 4289088, 428938, D03D 4962, C23C 1626, C23C 1650
Patent
active
057621101
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to dents for a reed in a high-speed weaving machine (loom) and a method of manufacturing the same and, more specifically, to a coating which enhances the durability of dents composing a reed and improves the productivity of processes for manufacturing the dents, and a method of coating such dents with the coating.
BACKGROUND TECHNOLOGY
A reed is a comblike attachment for a weaving machine, having a reed frame set with a plurality of parallel dents formed from thin metal strips and arranged at small intervals, and used to space the warp yarns evenly and to beat up filling yarns.
Generally, dents for use on a high-speed weaving machine are made of a stainless steel. The durability of dents has been a significant concern in recent years due to the progressive increase of the operating speed of weaving machines, the prevalent use of various synthetic fibers including high-strength fibers and modified cross-section fibers and various sizing materials, causing rapid abrasion of dents.
Since abraded dents cause fuzzing and yarn breakage, abraded dents must be replaced with new ones, which requires much time and labor. Therefore, the durability of dents affects significantly the operating efficiency of the weaving machine and the cost of the fabric.
The inventors of the present invention proposed previously in International Publication No. WO92/06234 improvements to enhance the durability of dents greatly by coating the entire surface of each dent or at least part of the surface of each dent including a portion that is exposed to an intensive abrasive action with a diamondlike carbon film (hereinafter referred to as "DLC film").
The DLC film is a hard amorphous carbon hydride film which is formed by, for example, a vapor-phase deposition process, such as a plasma CVD (chemical vapor deposition) process using a hydrocarbon gas, such as methane gas.
FIG. 8 shows, by way of example, a reed to be used on a high-speed weaving machine in a front view. A reed 10 has a reed frame 16 formed by securely fitting together an upper and a lower frame bar 12 and a right and a left cross bar 14, a pair of coil springs 18 extended along the upper and the lower frame bar 12, and a plurality of dents 20 fixedly held between the adjacent coils of the pair of coil springs 18 at the upper and the lower end so as to be arranged in parallel to each other at small intervals.
Dents for use on water-jet weaving machines and air-jet weaving machines include a flat type dent 20A having the shape of a simple strip, as shown in FIG. 9, and a tunnel type dent 20B having a special shape, as shown in FIG. 10.
Shaded regions a and b of these dents 20A and 20B have been considered to be the most abrading parts subject to the most intensive abrading action of yarns.
Therefore, at least the surfaces of a base strip 21 made of a stainless steel including flat regions corresponding to the regions a or b are coated with a DLC film 22 as shown in FIG. 11. An intermediate layer 23 is formed to enhance the adhesion of the DLC film 22 to the base strip 21.
It has been proved that the DLC film, i.e., a hard carbon film, coating the surface of the dent including the most abrading part improves the durability of the dent remarkably.
When forming the DLC film over the entire surface or a region of the surface including the region a of the flat type dent 20A shown in FIG. 9 or the region b of the tunnel type dent 20B shown in FIG. 10 by a vapor-phase deposition process, such as a plasma CVD process, each dent takes a wide plasma space and hence the productive efficiency of the vapor-phase deposition process is very low.
Since at least both flat regions around the part of the dent which are to be in sliding contact with yarns must be covered with the DLC film, dents must be held with a considerably big interval between the flat regions of the surfaces of the adjacent dents in a plasma space (a film forming atmosphere). When the DLC film is to be formed on only part of the flat regions of the dent, the surface of th
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Enomoto Mitugu
Ikeda Shinji
Miya Yukio
Nanya Takanori
Shinomiya Hideo
Citizen Watch Co. Ltd.
Falik Andy
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