Textiles: manufacturing – Textile product fabrication or treatment – Of thread interlaced article or fabric
Patent
1984-04-19
1985-12-10
Jaudon, Henry S.
Textiles: manufacturing
Textile product fabrication or treatment
Of thread interlaced article or fabric
D21F 100
Patent
active
045570256
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention concerns an automatic seaming machine, and has more particular reference to a machine for use in joining together the ends of a papermakers or like fabric to produce an endless structure.
BACKGROUND ART
Heretofore, papermakers fabrics have been made endless by the process of hand weaving, with machine assistance, the individual ones of the warp yarns of the flat woven fabric with a set of weft yarns interposed between the ends to be joined, such a process being both laborious and time consuming. Those yarns interposed between the fabric ends to be joined will be referred to hereinafter as "weft yarns", since such yarns, as they exist in the finished seam, lie parallel to the weft, that is to say cross-machine direction, yarns of the fabric at large.
The object of the present invention is to provide a means whereby the joining (or seaming) might be effected mechanically or automatically.
DISCLOSURE OF THE INVENTION
According to one aspect of the present invention there is proposed apparatus for use in the mechanical seaming of opposed fabric ends comprising a shedding mechanism to receive and support a weft structure extending in the longitudinal direction of the intended seam, and to effect shedding thereof in accordance with requirements, and guide means locating a respective fringe of side-by-side warp yarns at each respective fabric end in requisite adjacent disposition relative to each other, and to the said weft structure, characterised by shed finger means selectively engageable with a weft structure carried by the shedding mechanism and adapted upon actuation, to enlarge the shed adjacent the fell of the woven seam for the time being existing, yarn engagement means selectively engageable with successive individual ones of the side-by-side warp yarns, at respective opposite sides of the machine, and yarn insertion means having a path of movement to engage a warp yarn engaged by the yarn engagement means and adapted, upon actuation, to insert such yarn into the shed.
According to another aspect of the invention there is proposed a method for the mechanical seaming of opposed adjacent fabric ends which includes the steps of providing opposed fringes of free warp yarns extending from each respective fabric end, introducing a weft structure between the said fabric ends to extend in alignment with the line of the intended seam, effecting successive shedding of the weft structure with the alternate introduction of one or more adjacent ones of the warp yarns of the said fringes into the shed from respective opposite sides thereof between each shed change, characterised by the step of physically enlarging the shed adjacent the fell of the fabric formed by the weft yarns and the last inserted free warp yarn prior to the insertion of the next free warp yarn or yarns thereinto.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described further by way of example only with reference to the accompanying drawings which illustrate two embodiments thereof and in which:
FIG. 1 is a perspective view of a first form of seaming machine constructed in accordance with the invention;
FIG. 2 is a perspective view of a part of the seaming machine of FIG. 1 shown to a larger scale, and illustrates the weft yarns displaced to provide a shed at one edge thereof, with the shed finger means engaged therewith at an initial position;
FIG. 3 is a view corresponding to FIG. 2, but differing therefrom in that the shed finger means have been moved towards the fell of the cloth to enlarge the shed;
FIG. 4 is a further view corresponding to FIG. 2 and illustrates a later stage in the seaming operation wherein a free warp yarn has been selected and drawn to a position for engagement by the yarn inserter;
FIG. 5 is a side elevation corresponding to the stage in the seaming operation illustrated by FIG. 4 and shows the selector with a free warp yarn engaged therewith;
FIG. 6 is a side elevation of a part of the machine shown in FIG. 1, to a larger scale;
FIG. 7 is a diagramm
REFERENCES:
patent: 3885596 (1975-05-01), Alexeff
patent: 4311172 (1982-01-01), Eckstein
Jaudon Henry S.
Scapa-Porritt Limited
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