Sewing – Method of sewing – On specified product
Patent
1998-02-02
1999-10-12
Izaguirre, Ismael
Sewing
Method of sewing
On specified product
112 62, 112322, 112260, D05B 1502, D05B 3100, D05B 2710
Patent
active
059641711
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention concerns sewing articles made of leather and the like, in particular for footwear production.
BACKGROUND ART
Known automatic machines for sewing leather articles usually feature a head, cantilevered on the front of the base structure and equipped with means for supporting the needle and related operating means.
The needle is moved toward an arm, which is situated below, that acts as a horizontal support, on which the leather articles to be sewn rest. The needle moves also in a direction parallel to the support arm.
The above mentioned machines are equipped also with transport means that move the two edges of leather articles to be sewn positioned one over the other, after each stitch.
A machine of this type is disclosed in the U.S. Pat. No. 4,848,252 by Applicant. This machine features a guide with two longitudinal flat surfaces, upwardly convergent, that form respective work tops, on which the leather articles to be sewn are moved.
Over the guide, there is provided a longitudinal shaft, with an arm keyed thereto and provided at its free extremity with an arc-like needle. The shaft oscillates 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 rotary hook with a thread.
The above mentioned machine sews edges of two leather articles, e.g. shoe uppers and toe caps.
However, this machine cannot be used for sewing together the bottom and the upper, in case the shoe is of open type and a strip is to be joined to the bottom.
FIG. 12 shows, as an example, a shoe with an upper sewn along its edge to a bottom.
It is to be noted that in this case the sewing is visible both along the edge of the upper and along the edge of the bottom, thus forming a kind of decorative motif.
At present, the sewing of the bottom to the upper is often hand-made, that requires a specialized staff thus increasing manpower cost and subsequently, the final cost of the product, and moreover, the productivity is reduced.
Another problem deriving from the hand-made sewing lies in the necessity of a camber that is made in front part of the shoe by previously shaping the front part of the upper like a dome.
Other known automatic machines, so-called "Rapid", can sew the bottom to the shoe upper.
However, the use of these machines requires former joining of the bottom and the upper by means of glue; moreover, the shoe must be mounted on a suitable last during sewing.
Obviously, this results in considerable working complexity and consequently, affects the cost of the product and the productivity.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a method for simplified sewing of leather articles, in particular the bottom and the upper of a shoe, without preliminary operations.
Another object of the present invention is to provide a machine that carries out the above mentioned method of sewing and that has a simple structure and is versatile in relation to different kinds of footwear.
The above mentioned objects are obtained in accordance with the invention by means of a method for sewing various kinds of articles, in particular made of leather, that includes: be sewn together against respective flat side surfaces of a longitudinal guiding plate formed at the top of a ring-like block, which rotates on a pin that is supported, with a horizontal axis and perpendicular to said guiding plate, by a free end of an arm that swings with respect to a stationary support frame; sewing said edges of said articles together by means of an arc-shaped needle that is reciprocated on a plane transversal to said guiding plate, between a retracted position, in which the needle is located beside one of said flat side surfaces and a piercing position, in which the needle pierces said articles, said needle being moved forward and backward according to a predetermined step; swinging said arm while sewing the two articles together so that the spatial attitude of said gui
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