Gripping breadth holders in a warp knitting machine

Details Gripping breadth holders in a warp knitting machine Gripping breadth holders in a warp knitting machine

2000-05-19

2001-06-19

Worrell, Danny (Department: 3741)

Textiles: knitting

Fabric manipulation

Take-ups

C066S14900S, C066S147000

Reexamination Certificate

active

06247337

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a warp knitting machine with a knitting mechanism in the work area and a subsequent fabric pull-off.
2. Description of Related Art
In known warp knitting machines it is customary to provide the fabric pull-off as close as possible to the working area. This proximity is sought because of space efficiency or, as in the case in the Raschel machine, because of the manner of the knitting technology. Even when the distance between the working area and the pull-off is only a few centimeters, for example, to 2 to 10 centimeters, the edges of the fabric path moves inwardly before reaching the pull-off point. The size of this shrinkage depends on the type of goods produced and is at its greatest in elastic fabric.
Accordingly, an object of the present invention is to provide means which are operative even in the smallest separation between the working area and the fabric pull-off to avoid or substantially hinder this intrusion of the fabric path edges.
SUMMARY OF THE INVENTION
In accordance with the illustrative embodiments demonstrating features and advantages of the present invention, a pair of gripping breadth holders is provided in a working area of a warp knitting machine. A plurality of knitting tools and an adjacent fabric pull-off arrangement is located in the working area across its working breadth. The pair of gripping breadth holders are between the working area and the fabric pull-off. The holders are located at both edges of a fabric path. Each of the gripping breadth holders has at least one driven wheel having a plurality of circumferential needles. The wheel is driven through a drive axis that is substantially parallel to the working breadth of the machine. The wheel is mounted to rotate about a wheel axis that is inclined at an inclination angle to the drive axis.
Preferably, on both sides of the fabric path, gripping breadth holders are located in the working area and the fabric pull-off area. The holder preferably have at least one drive wheel with needles provided around its circumference. The drive axis is substantially parallel to the working width of the machine and the axis of the wheel runs at an angle thereto.
These breadth holders, because of the course of the drive axis, have a very small dimension in the pull-off direction. They can therefore be located relatively close behind the knitting elements; and even when there is a very small space between the working area and the fabric pull-off area, they may be inserted.
Because of the angular positioning of the at least one wheel, the gripping of the needles into the fabric path and the rotation of the wheel carried with it, leads to a force component transverse to the pull-off direction and thus has a certain breadth stretching effect. This is substantially amplified when the least one wheel is driven, so that the tension of the fabric at the edge is raised and the width of the fabric path, when it reaches the first take-off roller of the fabric take-off mechanism, is substantially maintained.
It is advantageous if the breadth holder has between two and four wheels. On the one hand, this gives the opportunity to operate on a sufficiently wide breadth area and on the other hand, by axial displacement of the breadth holder. The operating breadth holder forces may be adjusted.
It is desirable that the angular positioning of the at least one wheel relative to the travel direction of the fabric path is adjustable. By adjusting the appropriate angular position, the desired edge tension may be adjusted.
In a preferred embodiment, it is provided that the carrier means has one axial bore which carries a drive shaft and at least one angled pocket which takes up a wheel. It is relatively simple to provide such a carrier body.
As coupling means between the drive shaft and the wheels, many different forms of construction are possible which take account of the different axial positions of the drive shaft and the wheels, for example universal joint couplings, elastic couplings, elastic shafts and the like. It is particularly advantageous that the drive shaft has axial grooves into which radial inwardly directed pegs of the wheels may extend. Such a coupling can be formed in an exceedingly small space.
It is also advantageous that the circumference of the wheels protrude from the angled pockets over at least 90° and that by alteration of the rotational setting of the carrier body, the effective transverse displacement of the needles of the wheels may be altered. This gives rise to further possibilities which have an influence on the width holding effect.


REFERENCES:
patent: 2348162 (1944-05-01), Warner
patent: 2916899 (1959-12-01), Hepp et al.
patent: 4061374 (1977-12-01), Altmann
patent: 4140574 (1979-02-01), Justus
patent: 742504 (1980-06-01), None

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