Typewriting machines – Including interposed inking device for record-medium – Ribbon – per se
Patent
1993-11-19
1995-01-10
Burr, Edgar S.
Typewriting machines
Including interposed inking device for record-medium
Ribbon, per se
4002413, B41J 3102, B41J 3104
Patent
active
053801075
DESCRIPTION:
BRIEF SUMMARY
TECHNOLOGICAL FIELD
The present invention relates to a base fabric for an ink ribbon which provides an ink ribbon which may be used for an impact-type printer and exhibits excellent durability on the welded part.
TECHNOLOGICAL BACKGROUND
Recently, as an ink ribbon used for an impact-type printer, the conventional spool types have been decreasing in number and products wherein a long tape-like ink ribbon is folded and stored in a cassette have been increasing. However, in such ink ribbons, both ends are welded (adhered) by means of an ultrasonic welder and made into an endless-type product and the life of the welded part exerts an influence upon the life of the ink ribbon. Namely, as the ink ribbon receives impacts from a head pin of a printer during printing and is gradually destroyed, the welded part exhibits lower durability than that of the ordinary part of a base fabric. Especially in these days, with remarkable increase in speeding and impacting of printers, remarkable improvement of durability of the welded part of the ink ribbon has been earnestly desired.
As a means for improving durability of the welded part, a technology wherein a thermoplastic synthetic resin layer with a melting point lower than that of the base fabric was placed between two ink ribbons and was welded, was proposed in Japanese Patent Publication No. 13,431/1982. However, there existed still problems that the improvement of durability of the welded part was not practically sufficient even by this method and workability on welding was not good either. Namely, it is the present status that improvement of durability of the welded part to cope with speeding up and impacting of a printer has not been realized.
DISCLOSURE OF THE PRESENT INVENTION
The present invention provides a base fabric for an ink ribbon with good durability of the welded part. The present invention uses the following means for realizing such a purpose.
Namely, the base fabric for an ink ribbon of the present invention is characterized by a constitution wherein at least one yarn of the warp and weft constituting the base fabric is constituted of core/sheath-type composite fibers wherein the sheath component consists of a polymer with a melting point that is lower than that of the core component. An example of the favorable embodiments is the case wherein the core component of said core/ sheath-type composite fiber is a polyamide polymer and the sheath component is a polyamide polymer with a melting point that is lower than that of said polyamide polymer.
The present invention has a feature wherein a base fabric for an ink ribbon is formed with a fiber having weldability as a single fiber unit. Namely, a base fabric woven by using a core/sheath composite fiber wherein the inner layer (the core) of the single fiber is constituted of a high melting point polymer and the surface layer part (the sheath) is constituted of a low melting point polymer as at least one yarn of the warp and the weft, exhibits extremely high adhesive force by welding and no extreme decrease in strength by welding, and durability of the welded part is remarkably improved.
As the polymer used for the core of the present invention, polyamides and polyesters are representative and especially, as the polyamides, nylon 46, nylon 66, nylon 610, nylon 11 etc., are cited and as polyamides used for the sheath, such a nylon that has a melting point that is lower than that of the core polymer, preferably 10.degree.-120.degree. C. lower and more preferably 20.degree.-100.degree. C. lower among these nylons, for example, a copolymer wherein an amide raw material for tha above described nylon is copolymerized with one or more different kinds of amide raw materials can be used. As the polyesters, polyethylene terephthalate, polybutylene terephthalate or copolymers thereof are used as the core or the sheath components.
The composite ratio of the sheath in the core/sheath composite fiber is preferably 5-90% to the weight of the composite fiber from the viewpoint of improvement of durability of the welde
REFERENCES:
patent: 3156338 (1964-11-01), Ploeger, Jr.
patent: 4018955 (1977-04-01), Klauke et al.
patent: 5017029 (1991-05-01), Andou et al.
Hiroe Nobutake
Kato Tetsuya
Burr Edgar S.
Hendrickson Lynn D.
Miller Austin R.
Toray Industries Inc.
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