Sewing – Special machines – Leather sewing
Patent
1997-05-27
1998-09-08
Nerbun, Peter
Sewing
Special machines
Leather sewing
112 62, 112310, 112153, 112321, D05B 1502, D05B 2720, D05B 3510
Patent
active
058029982
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to machines for footwear production.
BACKGROUND ART
The Applicant has already constructed machines for sewing leather, e.g. toe caps and uppers that form a kind of shoe called a moccasin (see Italian Patent No. 1.192.031).
This known machine is extremely versatile and particularly suitable for producing the so called tubular moccasins.
As it is known, this type of moccasin includes a close-bottomed upper. During manufacturing, the edge of the upper and the edge of the toe cap are placed on upwardly convergent work tops, close to each other, and sewn together.
The just mentioned machine includes a feed dog, situated beside the first work top, and reciprocating longitudinally in phase relation with the movement of the needle and a first presser foot, but in the opposite direction.
When the edges of the leather articles are being sewn, the feed dog crimps the edge of the upper so as to allow shaping of the moccasin.
The tubular moccasin, obtained in this way, partially covers the support arm of the sewing equipment that must have a suitable shape so as not to interfere with the operator's movements and the shoe making parts.
The necessity exists of a machine that features the same quality as the machine briefly described above, but that is simpler under the manufacturing point of view and that is particularly suitable for sewing moccasins only with an open-bottomed upper.
DISCLOSURE OF THE INVENTION
The object of the present invention is to propose an automatic machine for sewing leather that meets the above mentioned necessity, i.e. a machine of simple construction, easy to use, reliable and functional.
Another object of the present invention is to make it possible to use the machine in its simplified form, even with a rectilinear needle.
The above mentioned objects are obtained, in accordance with the claims, by means of an automatic machine for sewing different kinds of articles, especially leather articles such as an upper and a toe cap for producing a so-called open moccasin, that includes: a longitudinal guide that is removably mounted on an underlying fixed support and that defines two longitudinal work tops, first and second, respectively formed by flat sloping surfaces mutually and upwardly convergent; hold down means that are located above said guide and that, in conjunction with said work tops, guide the edges of articles resting on said work tops; a needle situated beside the second work top, and movable so as to define two extreme positions, in one of which the said needle pierces juxtaposed edges of the articles resting on the above mentioned work tops, by passing through a slot made in the upper part of said work tops, said needle being also given a reciprocating longitudinal motion with an outward and return stroke, so as to make the leather articles move forward; a rotary hook device, located beside the first work top and working in conjunction with said needle to sew a stitch when the needle is in its lowermost position, in which it pierces the leather articles, said rotary hook device being also reciprocated, together with the needle.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention can be fully understood from the following detailed description thereof, in connection with accompanying drawings which form a part of this application and in which:
FIGS. 1, 2 are perspective views of the working zone of the subject machine;
FIG. 3 is a perspective view of the working zone of the subject machine, seen from a different point of view;
FIG. 4 is a perspective view of the machine working zone with the leather edges in sewing position;
FIGS. 5, 6 and 7 are prospective views of the machine working zone, during three subsequent sewing steps;
FIG. 8 shows the toe cap and the upper, sewn one to the other. FIG. 9 is a view of a prior art mechanism for operating the needle, a crochet, a first feed dog and a first pressure foot.
FIG. 10 is a cross-section view taken along the line II--II of FIG. 9.
BEST MODE OF CARRYING OUT THE INVENTION
With refere
REFERENCES:
patent: 1617338 (1927-02-01), Leveque
patent: 3038428 (1962-06-01), Judet
patent: 4375787 (1983-03-01), Brutti
patent: 4848252 (1989-07-01), Ciucani
patent: 5257589 (1993-11-01), Forstpointner
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