Sewing – Special machines – Positionable work carrier
Patent
1996-07-02
1998-03-17
Nerbun, Peter
Sewing
Special machines
Positionable work carrier
11247512, 269 541, D05B 3900, B25B 514
Patent
active
057274886
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a device for holding at least one blank or workpiece, made of a material preferably having a low bending strength, in a predetermined position during a machining operation, especially during a sewing operation, for the production of a three-dimensional casing. The device has a carrier body, which is provided with at least one contact surface and essentially corresponds to the shape of the casing to be produced. The blank can be mounted on the contact surface in a detachable manner, and the device is provided with at least one holding unit, which holds the blank on the contact surface during the machining operation.
BACKGROUND OF THE INVENTION
In order to machine blanks made of a material having low bending strength into three-dimensional casings with automated production devices, it is possible to mount the blanks on a carrier body, which essentially has the shape of the casing to be produced. In this case, the blanks are arranged at an angle to one another such that their edge areas at least partially overlap. Subsequently, a suitable tool, e.g., a sewing machine arranged on an arm of a manipulator, moves along the overlapping area, by means of which the two blanks are connected. A large field of application exists for this, e.g., the sewing of textile materials or leather. Since the sewing machines of such automated sewing systems move along predetermined paths, it is necessary for the blanks to be arranged exactly at the positions provided for this during the sewing operation.
However, based on the low-bending-strength properties of these materials, it has proved to be difficult to achieve and maintain this positioning for the duration of the machining operation. Therefore, corresponding devices exist in the state of the art in order to guarantee this maintaining of position. Thus, each feeding device is fitted with a blank and together with this blank is arranged on a carrier body in a device that has become known from German Patent DE-PS 42 25 008. After the feeding device has been removed again, its holding plates remain on the blank. The metallic holding plates then press the blank, which is located between them and the carrier body, onto the corresponding contact surface of the carrier body by means of a magnet of same. In order to hold the blank securely, the pressing surfaces of the holding plates are only slightly smaller than the blank, so that the edge zone of this blank to be machined protrudes against these pressing surfaces. Since the holding plates also lie on the side of the blank opposite the carrier body during the sewing, the blank is not readily accessible. The movement of the sewing arm of a sewing machine must therefore be adapted to the arrangement of the holding plate, which, above all, is felt to be a disadvantage if the blank is to be, e.g., also embroidered. It is likewise not satisfactory that the holding plates must be removed again after the sewing operation and be fed again to the carrier body after the casing has been removed from same. In addition, the fixing of the blanks by means of holding plates leads to the fact that the feeding device, since it must accommodate a holding plate in addition to the particular blank, is structurally relatively complicated. Furthermore, this manner of fixing the blanks is relatively time-consuming, since the holding plates must be handled outside of the actual sewing operation, whereby the time needed for a machining cycle of a casing is relatively long.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the present invention is to provide a device of the type described in the introduction, by means of which a blank or workpiece can be held securely during a machining operation, without having the described disadvantages.
This object is attained with a device where each holding unit has holding elements arranged in a recess of the carrier body. These holding elements can be transferred from a resting position situated within the carrier body to a contact position, in which t
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Altin-Nahtechnik GmbH
Nerbun Peter
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