Sewing – Special machines – Leather sewing
Patent
1997-05-27
1998-05-26
Nerbun, Peter
Sewing
Special machines
Leather sewing
112 62, 112310, 112321, 112153, D05B 1502, D05B 2720, D05B 3510
Patent
active
057551677
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to sewing leather articles or the like, in particular for footwear production.
BACKGROUND ART
Known automatic machines for sewing leather articles, like e.g. a toe cap and a vamp of a shoe, usually feature a head, cantilevered on the front of a base structure and equipped with means supporting the needle and related operating means.
The needle is moved toward an arm, situated below, that acts as a horizontal support, on which the leather articles to be sewn rest.
The needle moves also in direction parallel to the support arm. The above mentioned machines are equipped also with transport means that move the edges of the leather articles to be sewn after each stitch.
A machine of this type is disclosed in the U.S. Pat. No. 4,848,252 of the same Applicant. This machine includes a guide that longitudinally defines two flat inclined surfaces, upwardly convergent, that form respective work tops, on which the leather articles to be sewn are moved.
Over the guide, there is a longitudinal shaft, with an arm keyed thereto and provided at its free extremity with a curved needle.
The shaft is oscillated so as to alternatively move the needle between a raised position and a lowered position, in order to pierce the edges of the leather articles.
The needle operates in combination with a crochet with a thread. The above mentioned machine is designed to sew edges of shoe uppers and toe caps of any shape.
However, this machine cannot be used for decorative stitches, such as, in particular, shoe upper ribs obtained by sewing.
FIG. 1 shows, as an example, a shoe upper 1 with a rib 2 that runs along the outline of a toe cap 3; the rib 2 is obtained by stitches 4.
This kind of decorative stitch not only imitates the joining of two different parts, i.e. the shoe upper and toe cap, sewn together, that in fact are instead made from one piece of leather, but also stiffens the shoe in order to shape it in a desired way.
At present, the above mentioned decorative stitching is hand-made, that requires a specialised staff thus increasing manpower cost and subsequently, the final cost of the product, and moreover, the throughput is reduced.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide an automatic device designed to perform decorative stitches on leather articles, particularly ribs on a shoe upper.
The above mentioned object is obtained by means of a device for sewing articles made of leather that includes a longitudinal guide, a part of which is laterally delimited by two inclined flat surfaces upwardly convergent, forming at the top a tooth on which an article to be sewn is moved, a folding member that is situated over said longitudinal guide for clamping said article to the tooth, by folding this article on the inclined flat surfaces, when a needle has formed a stitch, and a leather pressing element, that presses the article in position adjacent to the stitch that has just been formed, and situated on a plane that is transversal with respect to the longitudinal guide, on the side where the needle enters the article.
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristic features of the present invention are pointed out in the following description with reference to the enclosed drawings, in which:
FIG. 1 is a perspective view of a shoe upper with a decorative rib;
FIG. 2 is a perspective view of the stitching device, being the subject of the present invention, mounted on the sewing machine;
FIG. 3 is a detailed perspective view of the said stitching device;
FIG. 4 is another perspective view of the stitching device, seen from a different point of view;
FIGS. 5, 6, and 7 are views of different working steps of the device shown in FIG. 3;
FIG. 8 is a perspective view of a shoe upper featuring a different embodiment of decorative stitch;
FIG. 9 is a longitudinal section view of a particular of the subject device, suitably equipped for performing the decorative stitch of FIG. 8;
FIG. 10 is a corresponding transversal section of the same particular sho
REFERENCES:
patent: 2235753 (1941-03-01), Waterman
patent: 2399159 (1946-04-01), Ashworth
patent: 3081719 (1963-03-01), Fake
patent: 4848252 (1989-07-01), Ciucani
patent: 5207169 (1993-05-01), Ciucani
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