EP0778365A2 - Reed for a loom - Google Patents

Abstract

The invention relates to a reed (reed) for air jet weaving machines, consisting of any number of partial reeds, between each of which there is a reed filler piece, with a continuous weft insertion channel being present, which roughly corresponds to individual reeds or the reed filler pieces sections aligned with one another is divided and in the transition area between a section of the weft insertion channel to the subsequent section of the latter is at least partially widened in a funnel shape against the weft direction relative to the rest of the weft channel.

Description

The invention relates to a reed (Riet) for air jet looms according to the preamble of claim 1.

The invention is based on a reed according to DE 41 31 167 A1, the reed being divided into a number of partial reeds. There is a gap between the reeds, a so-called reed filler is arranged in the area of the reed gaps, which is approximately the same as the reed. Through the reed filler, the ventilation properties of the weft insertion channel of the reed are simulated, i.e. H. the weft insertion channel continues in the reed fill pieces.

With such a structure of a reed there is the problem that a gap is formed between the partial reeds and the reed filler pieces, since the respective sections of the reed must have a certain distance from one another in order to have sufficient freedom of movement. In the same way, the weft insertion channel of the respective reed sections is also separated by a gap.

If the partial reeds and the reed filler pieces are not exactly aligned with each other, an edge or step forms in the transition area between the individual sections of the weft insertion channel, which can disrupt the movement of the blown weft thread through the weft insertion channel or the weft thread can get caught on such an formed edge can.

The invention has for its object to develop a reed of the type mentioned in such a way that an impairment of the weft inserted in the transition area between individual reed sections is avoided.

This problem is solved by the technical teaching of claim 1.

It is a feature of the invention that the individual sections of the weft insertion channel assigned to the partial reeds or the reed filler pieces are designed in such a way that no step can form in the transition area between one section and the next against the weft direction. This is achieved in that the transition region between a section of the weft insertion channel and the subsequent section of the latter is at least partially funnel-shaped against the weft direction.

This ensures that abutting edges or step formation in the transition area between the weft channel sections are avoided, which previously resulted from the fact that the individual reed sections were no longer more precisely aligned with each other over time due to inaccurate adjustment or automatic adjustment.

The funnel-shaped widening of the thread entry areas of the respective reed sections allows certain tolerances in the position adjustment of the partial reeds or filler pieces, since an annoying step formation in the weft insertion channel can no longer occur.

Normally, the weft insertion channel is approximately U-shaped and it is provided that all three wall regions of the weft channel are expanded in a funnel shape.

Of course, it is also conceivable that the weft insertion channel is widened only in the vertical direction or only in the horizontal direction.

The dimensions of the firing channel are relatively small, so that the expansion of the Channel moved on the order of a few millimeters.

Figur 1:

eine schematische Frontansicht des erfindungsgemäßen Webblattes;

Figur 2:

eine Detailansicht eines Übergangsbereiches zwischen zwei Webblattabschnitten nach dem Stand der Technik;

Figur 3:

eine Detailansicht eines Übergangsbereiches zwischen zwei Webblattabschnitten gemäß der Erfindung.

The invention is explained in more detail below with reference to drawings.
Show it:

Figure 1:

a schematic front view of the reed according to the invention;

Figure 2:

a detailed view of a transition area between two reed sections according to the prior art;

Figure 3:

a detailed view of a transition area between two reed sections according to the invention.

Figure 1 shows a schematic view of a reed, which consists of an alternating arrangement of partial reeds 1.1a and reed filler 2.2a.

There is a weft insertion channel 3 that extends across the entire width of the reed. The weft thread 5 is blown into the weft insertion channel 3 through a main nozzle 4 and passes through the entire weft insertion channel 3 up to the opposite side of the reed.

FIG. 2 shows the transition area between a partial reed 1 and a reed filler 2 of a reed according to the prior art. The continuous weft insertion channel 3 can be seen, two sections 8, 9 of which are shown here. Due to inaccurate adjustment of the reed sections 1, 2 or signs of wear, it often happens that the sections 8, 9 of the weft insertion channel 3 are no longer aligned with one another, so that an edge forms in the entrance area of section 9 of the weft insertion channel, on which the registered weft 5 can get caught in the worst case. This results in an error message from the shot monitoring and the machine comes to a standstill.

According to FIG. 3, the section 9 of the weft insertion channel 3 in the transition region 6, ie. H. in its entrance area, a funnel-shaped expansion. As a result, even when the reed sections 1, 2 are offset from one another, the weft insertion channel for the weft thread 5 always represents a free passage, since edges or steps, as shown in FIG. 2, can no longer occur. In particular, there can be no edges or steps that are formed counter to the weft direction.

With the inventive design of the reed or the weft insertion channel, it is possible to counteract a weft inhibition in the transition area between two sections of the reed, so that far shorter downtimes of the machine occur.

DRAWING LEGEND

1

Partial rate 1a

2nd

Reed filler 2a

3rd

Weft insertion channel

4th

Main nozzle

5

Weft

6

Transition area

7

Firing direction

8th

Section (weft insertion channel)

9

Section (weft insertion channel)

Claims (5)

Reed (reed) for air jet weaving machines, consisting of any number of partial reeds (1,1a), between each of which there is a reed filler (2,2a), with a continuous weft insertion channel (3) which is divided into individual, the partial reeds or The sections (8, 9) which are assigned to the reed filler pieces and are approximately aligned with one another, characterized in that in the transition region (6) at least between the section (8) of the weft insertion channel and the subsequent section (9) of the latter in the opposite direction to the weft partially widened in a funnel shape with respect to the rest of the firing channel. Reed according to claim 1, characterized in that only the entrance area of the respective section of the weft insertion channel (3) is widened. Reed according to claim 1 or 2, characterized in that the respective sections of the weft insertion channel (3) are widened in the vertical direction. Reed according to one of claims 1 to 3, characterized in that the respective sections of the weft insertion channel (3) are widened in the horizontal direction. Reed according to one of claims 1 to 4, characterized in that the widening of the sections of the weft insertion channel (3) is of the order of a few millimeters.

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