Sewing – Special machines – Traveling sewing machine
Patent
1998-01-28
1999-11-23
Izaguirre, Ismael
Sewing
Special machines
Traveling sewing machine
11247508, 2807281, D05B 1300, B60R 2116
Patent
active
059880856
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for fabricating a hollow body from blanks, obtained from at least one web of material, particularly of a textile material, as well as to a method of fabricating the hollow body by making use of the apparatus. Hollow bodies of this kind are required for the fabrication of air bags, but also for seat or cushion covers. Instead of textile material plastics films may also be employed.
2. Description of the Related Art
Fabricating air bag hollow bodies by stitching together blanks from one or more webs of material is known. Stitching together the blanks is problematic. The shape of the blanks depends on the desired shape of the air bag hollow body. In most cases blank contours materialize which cannot be simply stitched together; the outer shapes of the blanks are mismatched so that they can not simply be placed one on the other in a single plane. Thus, instead, it is often necessary for the stitcher to register the blanks together piece by piece during the stitching procedure. As a result a seam materializes as a kind of three-dimensional configuration. On the one hand this work is very time-consuming and, on the other, it results in a relatively large amount of waste since it is not always the case that the marks on the edges of the blanks actually belonging together are also in reality stitched together. Displacements occur and the fabricated air bag hollow body needs to be eliminated as scrap. The case is similar as regards seat covers having complicated shapes.
SUMMARY OF THE INVENTION
In accordance with the present invention, an apparatus is defined which automates bringing the blanks together. This is done by making use of a main part of the apparatus in the form of a ring-like, self-contained plate, two side plates matching the sides of the main part, as well as one or two stitchers. For firmly holding the blanks at the inner walls of the main part and of the side plates suction orifices may serve which are in connection with a suction device. Instead of this the blanks may also be sucked into place electrostatically. Automatic stitchers may run around the rims of the side plates and of the main part. Instead of this a sewing machine may be provided, with respect to which the main part is turned with one or two side plates. The sewing machine may be horizonatally movable.
To fabricate a hollow body a blank is sucked into place at the inner wall of the main part. In addition, one blank each is sucked into place at the inner walls of the two side plates. After the main part and the side plates have been brought together seam allowances covering each other protrude from the three blanks. These seam allowances are then stitched to each other by the automatic stitchers or the sewing machine. On power OFF of the stitchers and after having retracted a side plate from the main part the finish-stitched hollow body can be extracted.
For guiding the side plates and the main part together and apart an automatic movement device may serve. This, the stitchers or the sewing machine and the suction devices may be coupled to each other for the necessary function sequence.
For registering the blanks, marks, holes or sections serving adjustment on the rims of the side plates and of the main part as well as on the edges of the blanks may be provided. As a result of this a very accurate register by hand is made possible. However, the blanks may also be taken from a container each and registered with sufficient accuracy by machine action.
One automatic stitcher or one such device for each side may be guided around each of the two rims of the main part and of the side plates on one robotic arm (each). The other end of the robotic arm may be attached fixedly located or in the case of a portal robot may be guided on rails e.g. horizontally and perpendicularly. Instead of this a robotic device may be made to run around the main part in a fixedly located guide as a kind of circular ring, i.e. like a gyro-wheel.
BRIEF DESCRIPT
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Berger Johann
Izaguirre Ismael
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