Selvage-forming device for a power loom

Details Selvage-forming device for a power loom Selvage-forming device for a power loom

1997-04-28

1998-09-08

Falik, Andy

Textiles: weaving

Warp manipulation

Traversing

139430, D03C 1100

Patent

active

058031332

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field Of The Invention
The invention concerns a selvage-forming device for a power loom having at least two thread guide elements guiding two selvage threads, said elements being mounted in an extension of the shed and which, to create a shed from the selvage threads, are driven in mutually opposite lifting and lowering directions by a drive motor.
2. Related Technology
Selvage forming devices are used in power looms to form a selvage of a fabric or to form a scrap strip to be severed from the fabric. The selvage threads are guided in such manner along the thread guide elements that they form an opening and closing shed as an extension of the weaving shed, said selvage shed receiving fillings that then are bound into these selvage threads in a predetermined pattern.
There are two types of selvage-forming devices. In the first kind, thread guide elements are provided in the loom's shed forming system, as a result of which the guide elements move along with the loom's shed forming system. This first type only allows implementing a weave with the selvage threads corresponding to the weave formed by the shed forming system of the loom. In the second type the selvage forming device, the device includes its own drive displacing the thread guide elements independently of the loom shed forming means.
In a known design of the second type (European patent document A 051 95 50), the drive of the thread guide elements is powered by the main shaft of the loom. In this known design the drive is configured above the thread guide elements that carry out rectilinear opposed motions inside guide means. The thread guide elements are connected by coupling bars to a rail which in turn is connected to a cable displaced by a spring in one direction and by a drive lever in the other direction, said drive lever being connected to the loom's main shaft. This known selvage forming device allows making specific weaves, for instance a one/one weave wherein a weave or binding is formed for every filling insertion, or a two/two weave wherein a weave is formed after the insertion of two fillings. To pass from one weaving pattern to the other, drive elements, for instance gears, must be exchanged between the drive lever and the loom main shaft. This exchange is costly and requires shutting the loom down. If cam drives are used, other weave patterns may be formed, for instance one/two weaves, wherein the filling from a first insertion is bound and then the two following insertions are bound together. In order to change the particular set weave pattern, cams of the cam drive must be replaced by other cams. This exchange is costly and requires shutting down the loom.
Moreover a selvage-forming device of the initially cited species is known from the European Patent Application A 030 60 78 wherein a drive motor synchronized with the loom weaving cycles, that is with the main drive motor, drives the thread guide elements. In this design the thread guide elements are linked in such manner to a drive shaft that the lifting and lowering displacements are caused by a pivoting motion of the thread guide elements which additionally also move longitudinally. To convert the rotational motion of the drive motor into the pivoting motion, the thread guide elements also undergo a superposed longitudinal motion and are guided inside a closed slot guide forming a substantially rectangular guide track for the guide elements.


BRIEF SUMMARY OF THE INVENTION

The object of the invention is to create a selvage forming device of the initially cited species having a simple design and allowing changing the weave in a simple manner.
The invention solves this problem in that the thread guide elements are guided in longitudinal guides and are linked by transmission elements to a shaft in turn driven by the drive motor, the axis of said drive shaft being perpendicular to the direction of displacement of the thread guide elements, in that the transmission elements converting the rotation of the drive motor into longitudinal displacements

REFERENCES:
patent: 4614210 (1986-09-01), Debaes
patent: 5123454 (1992-06-01), Debaes

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