Patent Application
20050257653
This application claims the priority of European patent application No. 04 010 780.7, filed May 6, 2004, the disclosure of which is incorporated herein by reference in its entirety.
The present invention relates to an apparatus for a severing of planar textile structures, a weaving loom with such an apparatus as well as an application of the apparatus in a weaving loom.
In the textile industry such apparatuses are known by the designation thermal severing scissors or edge melting apparatuses. They serve predominantly to sever planar textile structures, i.e. depending on the used method of fabrication, fabrics, knitted fabrics and other structures in their longitudinal direction and to simultaneously weld the edge or edges.
Known severing scissors of this kind are described in the Swiss Patent Specification CH 680 227. They include a mount of metal in which two contact elements are located. A wire hoop is mounted to the contact elements and is heated electrically by a voltage applied to the contact elements. In order to prevent the contact elements from a shortening, they are electrically insulated from the mount by suitable insulation means.
For an economical application it is important that the severing scissors and their heating wires, respectively, can be exchanged and installed easily.
Hence, it is an object of the present invention to provide severing scissors that can be exchanged and installed easily.
Hence, in a first aspect, the invention relates to an apparatus for a severing of planar textile structures, comprising a mount with two contact elements arranged in said mount, and a wire hoop connected to said contact elements, wherein said mount comprises a ceramics body in which both contact elements are retained.
Due to the use of a ceramics body separate insulation means for the contact elements are not necessary, which simplifies the assembly and allows a production of the apparatus using less parts. The ceramics body possesses, furthermore, the necessary temperature resistance so that it is not damaged by the heat of the wire hoop.
A mounting opening is advantageously foreseen in the ceramics body into which mounting opening a mounting rod can be inserted. The mounting rod may be, e.g., a rod arranged at a weaving loom onto which the severing scissors are to be mounted.
The mount includes, furthermore, advantageously a clamping device, e.g., in the form of a metal block with a hole and an arresting device, e.g., in the form of a screw. These are designed in such a manner that a force can be exerted onto the clamping device by the arresting device wherewith the clamping device presses the mounting rod inserted into the mounting opening against the edge of the mounting opening and clamps it accordingly. For this task for instance a screw can be foreseen which is supported against the ceramic body. When it is tightened, the clamping device is moved and clamps the mounting rod against the edges of the mounting opening. In such a design a thread in the ceramics body can be dispensed with and the ceramics is only burdened by pressure such that, even at an extremely firm tightening, no damage of the ceramics occurs.
In a further advantageous embodiment, the contact elements extend through the ceramics body. They are connected at a first side of the ceramics body to the hoop or to leads to the wire hoop and at a second side of the ceramics body to connectors for the power supply. Each mounting element forms at the second side a threaded bolt onto which a nut is threaded and tightened against the ceramics body. At the first side a non-rotationally-symmetric structure is foreseen, which is locked against rotation in a recess of the ceramics body so that during a tightening of the nut the contact element is held arrested by the mount, which facilitates the tightening of the nut.
The device is advantageously used for a severing of planar textile structures in a weaving loom. The invention relates also to this use and to a correspondingly equipped weaving loom.
The invention will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings, wherein:
The apparatus according to
The mount 1 exhibits an essentially cuboid contour. It is formed advantageously by an integral ceramics body. Two contact elements 4 extend in two parallel longitudinal holes 3 through the mount 1. Each contact element 4 consists of a cylinder shaped rod which in the present embodiment supports the respective ends of the wire hoop 2, and specifically at a first side 5 of the mount 1. At the opposite, second side 6 of the mount 1 the cylinder shaped rod of each contact element 4 is provided with a thread 7 onto which two nuts 8a, 8b are screwed. These nuts serve for a fastening of the contact element and form the connection for the power supply.
Each contact element 4 carries at the first side 5 of the mount 1 a structure or projection 9 of a, e.g., polygonal (or other, not rotationally-symmetric) cross-section. The projections 9 lie together in a recess 10 at the first side 5 of the ceramics body of the mount 1. The width of the recess 10 is selected in such a manner that it prevents a rotating of the projections 9 so that during the tightening of the nuts 8a, 8b the respective contact element 4 is locked against rotation. The projections 9 lie, furthermore, on the bottom of the recess 10 and secure the contact elements against the pulling force of the nuts 8a.
In order to mount the apparatus onto a supporting rod 12 (see
The mounting opening 13 is formed by two windows 13a, 13b which are located between the outer walls and an inner chamber 15 of the mount 1 (see
A hole 20 extends from the second side 6 of the mount 1 into the inner chamber 15. A screw 21 is located in this hole 2 the thread of which engages an inner thread of the clamping body 16. The screw 21 forms a locking means by means of which the clamping body 16 or clamping device, respectively, may be moved relative to the ceramics body of the mount 1. When the screw 21 is tightened after the mounting rod 12 has been inserted, it pulls the clamping body 16 towards the second side 6 of the locking body so that the clamping body 16 presses the mounting rod 12 towards the edges of the mounting opening 13 and clamps the same. The head 22 of the screw 21 is, thereby, supported against the ceramics body and the ceramics body is loaded by pressure. Because ceramics absorb pressure forces better than pulling forces, a damaging of the ceramics body is prevented even when the screw 21 is tightened strongly.
As it can be seen clearly in
As can be seen in
In the embodiment described so far, the screw 21 is used as a locking device for the clamping body 16 and engages a thread of the clamping body 16. Alternatively, it is also possible to provide the thread for the screw 21 on the ceramics body at the inner side of the hole 20, e.g., by setting a metal thread carrier into the ceramics body or by forming the thread in the ceramics body itself. In this case the tip of the screw presses against an outer surface of the clamping body 16. This solution leads, however, to somewhat higher tensile stresses in the ceramics body, for which reason the solution in accordance with the figures is advantageous.
In a further embodiment, which is illustrated in
The apparatus according to the invention can be used for a severing of planar textile structures such as, e.g., fabrics or knitted fabrics of synthetic fibres. It is advantageously located at the edge of the fabric web of a weaving loom for a processing of the edge of the fabrics.
While there are shown and described presently advantageous embodiments of the invention, it is to be distinctly understood that the invention is not limited thereto but may be otherwise variously embodied and practised within the scope of the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 04010780.7 | May 2004 | EP | regional |
