Sewing – Special machines – Leather sewing
Patent
1997-05-27
1998-04-14
Nerbun, Peter
Sewing
Special machines
Leather sewing
112 62, 112153, 112310, 112321, D05B 1502, D05B 2720, D05B 3510
Patent
active
057380260
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 an upper of a shoe, usually feature a head, cantilevered on the front of a base structure and equipped with means supporting the needle and relative 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 feeding means that move forward 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 piece 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 for sewing overlapped edges, i.e. with the edge of the toe cap folded over and overlapping the edge of the shoe upper.
To solve this problem, a device for sewing two leather articles with overlapped edges, is disclosed in the Italian Patent Application No. BO94A 000048, owned by the same Applicant.
This machine includes a longitudinal guide formed by a lower fixed part that features, at its top, a curved winglet folded downwards, and an upper movable part mounted slidably along the same lower fixed part.
The fixed and movable parts of the guide define two inclined flat surfaces, upwardly convergent, on which articles to be sewn are moved.
A folding member moves vertically over the longitudinal guide and is aimed at clamping the edge of the first article to the curved winglet, so that the edge overlaps the edge of the second article, while the stitch is made.
The movable part of the guide is reciprocated by an operation group, that furthermore features a foot designed to press the edge of the second article against the surface of the same movable part. Moreover, the above mentioned device can also make a curling along the edge to be sewn, in particular along the shoe upper edge.
This curling is necessary specially for compensating for a different outline length of a shoe upper with respect to toe cap, when the shoe upper has a bottom and its outer edge is folded upwards to be joined to the toe cap.
The curling is not necessary when the shoe upper is of open type, i.e. when the upper does not have the bottom, but only a lateral band.
In fact, in this case, the shoe upper is made by a strip of leather with an edge joined to the upper and this edge of the strip of leather has basically the same length as the outline length of the upper.
FIG. 1 shows, as an example, a semi-manufactured product, from which a shoe is obtained. In its upper part, this semi-manufactured product features a toe cap 1 sewn along its edge to a shoe upper 2 of open type; the folded over edge 3 of the toe cap 1 overlaps the corresponding edge of the shoe upper 2 and is sewn thereto by stitches 4.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a device for sewing two leather articles, specially the toe cap and an open upper, with overlapped edges.
The above mentioned object is obtained, in accordance with the invention, by means of a device for sewing two articles, particularly leather articles, with overlapped edges, improved so that it includes a longitudinal guide, a part of whi
REFERENCES:
patent: 2399159 (1946-04-01), Ashworth
patent: 3776158 (1973-12-01), Zechini
patent: 4848252 (1989-07-01), Ciucani
patent: 5207169 (1993-05-01), Ciucani
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