WO2020245141A1

WO2020245141A1 - Apparatus for evening out the binding point line when weaving terry fabric

Info

Publication number: WO2020245141A1
Application number: PCT/EP2020/065265
Authority: WO
Inventors: Harald Arnold; Peter Czura
Original assignee: Lindauer Dornier Gesellschaft Mit Beschränkter Haftung
Priority date: 2019-06-07
Filing date: 2020-06-03
Publication date: 2020-12-10
Also published as: CN113906174A; JP2022535896A; EP3980593A1; DE102019208377B3

Abstract

The invention relates to an apparatus (1) for evening out the binding point line (BP) when weaving terry fabric, having a fabric support table (5) and a displacement device (10) for periodically displacing the fabric support table (5) in and counter to the weaving direction (W) in order to create loops, wherein spreaders (7) that are conjointly movable with the displacement device (10) are arranged in lateral peripheral regions of the fabric (G) behind the binding point line (BP) in the weaving direction. The apparatus according to the invention is characterized in that behind each spreader (7), in the weaving direction, there is arranged in each case a pulling device (30), which is movable relative to the displacement device (10), for pulling the fabric portion (GA) guided by the particular spreader (7) through the spreader (7) when the displacement device (10) is displaced in the weaving direction (W). The invention also relates to a weaving machine, in particular a terry weaving machine, having such an apparatus (1).

Description

Device for equalizing the tie point line

when weaving terry cloth

The present invention relates to a device for equalizing the tie point line when weaving terry cloth according to the preamble of claim 1.

An undesirable effect that occurs during weaving is the weaving-related lower warp tension in the edge area of a fabric

Comparison to the middle of the tissue. If spreaders are then also used in the edge area of the woven fabric, which are intended to keep the fabric width constant, the fabric tension in the effective area of the spreaders can deteriorate again. The deeper a temple dips into the fabric, the more the fabric is deformed.

Especially on terry looms it is absolutely necessary to work with wide holders. In the case of terry towels, the fabric is

Shifting device periodically moved back and forth in order to produce loops - also called knobs or loops. However, due to the increased friction occurring on the temple and the elasticity of the fabric and the outer warp threads, the edges of the fabric can

Backward movement does not follow to the same extent. For this reason, undesirable ones arise in the edge zones of the tissue

Irregularities.

On known terry looms with the said

Push button technology work by shifting the fabric by means of a correspondingly designed and long-known displacement device, this means that the distance from the last shot to the first shot of the new terry group in the temple area is less than in the rest of the fabric. This fact leads to the loop height in the effective area the temple is smaller than in the other fabric sections. This in turn has the consequence that the pile lamellas can fall off in the edge area, which leads to a standstill of the loom. This phenomenon can be explained by the fact that the spreader generates additional frictional resistance, which also increases as the immersion depth of the spreader increases. The fabric that is pushed through the temple with the blade stop can only partially overcome this design-related frictional resistance.

To solve this problem, CH 497 578 A proposes a weaving machine with edge-side spreaders, which are mounted displaceably and mechanically coupled to a displacement device. The temple as well as the fabric in and against the

Weaving direction moves in an oscillating manner to allow relative movements between

Avoid spreaders and fabrics. However, it has been shown that this device does not work optimally and that it is still too high

Fabric friction on the spreaders prevents an even fabric structure.

The object of the present invention is to provide a device according to the preamble of claim 1 in order to enable improved guidance of the tissue by means of spreaders arranged on the edge.

This object is achieved by a device with the features of independent patent claim 1.

The advantages of the device according to the invention are to be seen in the fact that after each spreader a drawing device (ie in the weaving direction the respective drawing direction follows the associated spreader) is provided, which when the displacement device is moved in the weaving direction Spreader guided tissue section forces a further movement in order to pull this tissue section a little way through the respective spreader. As a result, the frictional resistance generated by the respective temple can be at least partially overcome. According to the invention, a relative movement is thus achieved

Realized fabric section to the temple. In the present case, the term of the tissue section guided through a temple is the

Extension of a part of the fabric in the weft and in the weaving direction, the extent of such a fabric section in the weft direction corresponding to the width of the expander and in the weaving direction the distance from the fabric table to the pulling device or the part of the pulling device that pulls the fabric.

Preferably, the respective pulling devices with the

Mechanical displacement device, preferably purely mechanical, coupled and moved together with the displacement device in and against the weaving direction. The two pulling devices thus also perform a periodic movement together with the displacement device in order to pull the corresponding tissue sections through the spreader in time with the displacement device. Said according to the invention

Relative movement of the fabric sections to the expander takes place particularly preferably only during the relative movement of the

Pulling devices and the respectively assigned temple and also only in one half of the periodic movement instead.

The periodic displacing movement of the displacement device is particularly preferably linear, while the pulling device executes an additional periodic rotational movement, and in this case during one

Half-period preferably pivoted from above or, which is particularly preferred, from below into the corresponding tissue section in order to implement the pulling movement of this tissue section. In the second Half-period the pulling device swings a little or completely out of the tissue again, with no relative movement caused by the pulling device resulting between the corresponding tissue section and the respective temple.

According to an alternative, a substantially linear movement of the pulling devices in the direction of the tissue and back is possible.

In accordance with the foregoing, the pulling device is preferably arranged and set up in such a way that it exerts pressure on the tissue section to be pulled only from the top or, what is preferred, only from the underside, this pressure preferably being directed perpendicular to the tissue and where by this pressure the tissue section through the

associated temple is pulled.

According to a preferred embodiment, each pulling device comprises a plunger body with a plunging edge that preferably runs parallel to the firing direction and is able to move from a passive position to an active position in the respective tissue section or to deflect it out of its running direction. The pressure exerted on the fabric section by the diving edge during its

Movement from the passive position to the active position becomes this

Section of fabric pulled through the temple in front of the weaving direction. When moving back from the active position to the passive position and in the positions of the passive and active positions, there is no

Relative movement between the respective tissue section and the associated temple instead.

The diving edge of each diving body preferably dips into the tissue both in the passive position and in the active position. So steer the immersion body from the tissue in any position, the

The deflection in the active position is greater than in the passive position.

Preferably, each pulling device has a guide section which is attached to a stationary, i.e. is not moved back and forth by the sliding device, slide along. In this way, a precise guidance of the pulling device can be realized in order to realize the said relative movement of the respective tissue section with respect to the assigned spreader. The gate is preferably designed to be stationary or stationary, while the guide section of its trajectory follows the gate. The trajectory of the backdrop and the amount of shifting movement that the shifting device and thus the pulling device coupled to it exerts preferably influence the immersion depth of the immersion edge, i.e. how deep the immersion edge immerses into the tissue. The greater the diving depth, the more tissue is pulled through the temple concerned.

The link and guide section are preferably arranged with respect to one another in such a way that the pulling device is then active when the

Fabric shift (in the direction of the fabric take-off or in the weaving direction) begins. Here, the immersion height is advantageously greater, the greater the displacement path of the displacement device.

Said guide section has according to a preferred

Embodiment at least one roller, which rolls when moving the displacement device in and against the weaving direction on the backdrop.

Preferably, each of the two pulling devices arranged in the region of the fabric edges has a rocker with a rocker arm which extends essentially in the weaving direction and the respective

Guide section connects to the respective immersion body. Through the A rocker arm runs parallel to the firing direction and is arranged between the guide section and the plunge edge

Swivel axis. When the displacement device is displaced and the respective guide section is moved along the said link, the respective rocker arm is about the pivot axis of the rocker

pivoted. As a result, the diving edge dips depending on the trajectory of the backdrop and the distance covered

Displacement device relatively more or less into and out of the tissue. The direction of displacement of the displacement device determines whether the plunge edge is moved towards or away from the tissue section. When pressing or dipping into the tissue, a

Tissue section pulled through the temple while at the

Moving back the corresponding pressure on the tissue decreases and the pulling device only functions at most as a deflection element that does not cause the tissue to be pulled through the temple.

The rocker of each pulling device can be variably adjusted depending on the configuration, in particular of the said link and / or the plunge edge and / or the amplitude of the displacement path of the displacement device.

Each pulling device is preferably at a distance of between 1 cm and 10 cm, preferably less than 5 cm, particularly preferably less than 3 cm, to the associated spreader. The said diving edge has

preferably a distance of less than 5 cm, preferably less than 3 cm and particularly preferably less than 1 cm to the respective

Temple on. With such small distances, the pulling device can develop the best pulling effect, since elasticity effects of the fabric hardly play a role in the short section between the plunge edge and the temple. According to an advantageous embodiment, each temple is as

Roller body formed with needles arranged on its circumferential surface. The respective roller body here has an axis which runs parallel to the firing direction. The roller body rotates when

according to the invention, caused by the pulling device, with the respective fabric section being pulled through.

The invention also relates to a loom, in particular one

Terry loom, with a device for equalizing the tie point line when weaving terry cloth, as described above.

Further advantages of the invention are in the following

Embodiment described. It shows:

Fig. 1 is a side view of a schematically illustrated

Shifting device with pulling device in the passive position;

FIG. 2 is a side view of the displacement device of FIG. 1 in FIG

Active position, and

3 shows a plan view of the displacement device of FIGS. 1 and 2 (in the active position). In FIGS. 1 and 2 in side view and in FIG. 3 in plan view, a device 1 according to the invention for equalizing the binding point line BP when weaving in particular terry cloth is shown schematically

Illustration shown. The loom, which is not shown here, is particularly preferably designed and comprised in a known manner

in particular a shedding device, a weft insertion device, a reed 3 and a draw-in roller for pulling off the fabric G. Not all elements are provided with reference symbols in all figures. In particular, some reference symbols have been omitted in FIG. 2 for the sake of clarity. From the comparison with FIG. 1, however, all features also result directly from FIG. 2.

The device 1 has a tissue table 5, which extends over the entire width of the tissue, with receptacles 5a which are trough-shaped in cross section. The fabric table is arranged on a support profile 6, wherein in

Weft direction S several such support profiles 6 can be provided. In each of the trough-shaped receptacles 5a of the fabric edge regions there is a spreader 7 (only its suspension 9 is shown schematically), which in the present case is designed as a roller body and has needles on its circumferential surface. The roller-shaped temple 7 has a temple axis 8 which runs parallel to the weft direction S (see also FIG. 3).

In Figs. 1-3, only one temple 7 is shown. To the

Such a temple 7 is provided on the edge of the fabric which run along the weaving direction W. If a temple 7 is mentioned in the singular, the other temple 7 on the other fabric edge is also included; The same also applies to the drawing device 30 to be described later and its components. The temple 7 extend in the weft direction S over approx. 20 cm each, but can also be selected to be shorter or longer.

In front of the fabric table 5, several stationary blowing nozzles 4 (only shown schematically in FIGS. 1 and 2) following one another in the weft direction S are provided, which in a known manner for inserting and guiding a

Weft thread through the open shed (not shown) serve. The oscillating about its pivot axis 3a and only in FIGS. 1 and 2 reed 3 shown (see double arrow A) attaches the last inserted weft thread to the binding point line BP. Blowing nozzles 4 are used in an air-jet loom; however, the loom can also be designed as a rapier loom, for example.

Furthermore, the device 1 has a displacement device 10 which is used to displace the fabric table 5 in and against the weaving direction W

is trained. When moving against the weaving direction W, loops (also referred to as knobs or loops) are produced along the width of the fabric immediately in front of the spreaders 7 in the area of the tie point line BP, which are tied off by a subsequently inserted weft thread.

The displacement device 10 comprises according to the illustrated

Embodiment a extending in the weaving direction W push lever 12, which is coupled at its one free end facing away from the spreaders 7 with a motor-driven pendulum roller 13 - possibly with the interposition of a gear - which has a parallel to the

Weft direction S running, stationary roller axis 14 has. A schematically illustrated intermediate piece 15 is attached to the pendulum roller 13, which is part of the displacement device 10, and is connected to the said free end of the push lever 12 via a pivot axis 16.

At the other free end of the thrust lever 12, a roller 17 is arranged, the roller axis 18 of which runs parallel to the weft direction S. The roller 17 is guided on the top and bottom in stationary linear profiles 21, which in

Weaving direction run. The linear profiles 21 are with a

Support structure 20 connected, which is fixedly attached to the machine frame (not shown) of the loom. As a result of said upper and lower side guidance of the roller 17 in the stationary linear profiles 21, this free end of the push lever 12 is guided linearly, while the other free end of the thrust lever 12 by its articulation on the

Intermediate piece 15 also performs a small vertical movement.

The fabric table 5 and the temple 7 are mechanically connected to the push lever 12 in such a way that the push lever 12 entrains the fabric table 5 and the temple 7 with each of its movements. In the exemplary embodiment shown here, the said pendulum roller 13 oscillates periodically about its roller axis 14 and pushes the push lever 12 and thus also the fabric table 5 and the temple 7 either in or against the weaving direction W.

The device 1 shown in the figures has two pulling devices 30 separated from one another in the weft direction S, one in each case

Pulling device 30 is arranged immediately after a temple 7. In the present case, each pulling device 30 has essentially the same extension in the weft direction S as the respectively assigned spreader 7. According to the invention, each pulling device 30 is designed to be movable relative to the displacement device 10 in order to move that tissue section GA that is shown in FIG

Weft direction S is guided along the respective expander 7, to pull through this expander 7 when the displacement device 10 in

Weaving direction is shifted. Each of the pulling devices 30 thus ensures a relative movement of a tissue section GA relative to the

adjacent temple 7 and thus helps to even out the tie point line BP. The term “fabric section GA guided through a temple 7” is understood here to mean the extent of a part of the fabric G in the weft direction S and in the weaving direction W, the extent of such a fabric section GA in the weft direction S essentially corresponding to the width of the temple 7 and in the weaving direction W the distance from the temple 7 upstream in the weaving direction W fabric table 5 to the pulling device 30 or that part of the Pulling device 30, which has a pulling effect on the fabric G (see the

Versions below on the dip edge 41).

When the respective tissue section GA is forced through the associated spreader 7 with the aid of the pulling device 30, the frictional resistance which the respective spreader 7 exerts on the corresponding tissue section GA is overcome. As a result, only the two edge-side fabric sections GA, which are guided through the temple 7, experience this additional movement in the weaving direction W, while the fabric section arranged between these two edge-side fabric sections GA, i.e. the main part of the fabric G - remains unaffected by the pulling devices 30 apart from a respective short transition area.

A concrete implementation of this principle is explained in more detail below with reference to the exemplary embodiment shown in the figures.

In general, the pulling device 30 can be implemented in different ways. Particularly preferably, each of the two pulling devices 30 - as shown here - is mechanically coupled to the displacement device 10 and is periodically moved in and against the weaving direction W together with the displacement device 10. According to an alternative, the pulling devices can also act independently of the displacement device 10, which, however, would mean a not inconsiderable additional design effort.

According to the exemplary embodiment shown in the figures, each pulling device 30 comprises a rocker 32. Each rocker 32 has a rocker arm 33 which in the present case - as can be seen in particular from FIG. 3 - is L-shaped in plan view. In the side view of FIGS. 1 and 2 it can be seen that the rocker arm 33 has a longitudinal extension in the weaving direction W having. The rocker arm 33 is by means of two bearing journals 35 in

Pivot bearings 36 mounted so that the rocker arm 33 periodically and around a pivot axis 34 extending in the firing direction S

can be pivoted in an oscillating manner. Since the pivot bearings 36 are attached to the support profile 6, the rocker arm 33 is also by the

Displacement device 10 moved in and against the weaving direction W. Accordingly, the periodic pendulum or pivoting movement of the rocker arm 33 and its essentially superimposed by the

Displacement device 10 caused linear movement.

The forced periodic pivoting movement of the rocker arm 33 is realized in the present case by a guide section 38 which is provided at the end of the rocker arm 33 opposite the respective spreader 7 and which is moved along a stationary link 24 during the periodic movement of the displacement device 10. The gate 24 is here preferably, as indicated in FIG. 3, connected to the likewise stationary support structure 20 or otherwise on

Machine frame attached.

In the present case, the guide section 38 also includes a roller 39

Roller axle 39a, which rolls on the link 24. The trajectory 25 of the gate 24 and the amount of displacement movement of the

Displacement device 10 essentially determine the

Swivel movement of the rocker arm 33.

The end of the rocker arm 33 adjacent to the respective spreader 7 is designed as an immersion body 40, which extends in the firing direction S.

having extending dipping edge 41. In the present case, this is arranged directly after the spreader 7 designed as a roller body and preferably has a distance from this of less than 5 cm, preferably less than 3 cm and particularly preferably less than 1 cm Temple 7 on. The plunge edge 41 is designed and set up to be periodically pivoted or pressed into the underside of the fabric G and pivoted out or moved out again a little. The plunge edge 41 is periodically transferred from a passive position to an active position and back in time with the displacement device 10 and the oscillating rocker arm 33. In FIG. 1 the immersion body 40 and thus also the immersion edge 41 are shown in the passive position and in FIG. 2 in the active position. It can be seen that the dipping edge 41 presses into the tissue G from below, both in the passive position and in the active position, but with different depths of immersion.

According to FIG. 1, the displacement device 10 is in its position displaced the furthest against the weaving direction W and, when moving into this position, has produced a row of loops in the warp threads (not shown). In this position, the roller 39 rests on the outer end of the rocker arm 33 on a steep section of the trajectory 25 of the link 24. This requires, caused by the rocker arm 33 given away about the pivot axis 34, that the plunge edge 41 is in its

Passive position is located and from below into the neighboring

Tissue section GA immersed. If the fabric table 5 and the

Pulling device 30, so in particular the rocker arm 33 together with the pivot axis 34 shifted in the weaving direction W, the roller 39 rolls off the link 24 and arrives at the apex of the trajectory 25 shown in FIG steeper position, whereby the diving edge 41 in its active position

is pivoted, in which it dips further into the tissue section GA than in the passive position (see Fig. 1). The pressure of the plunge edge 41 exerted during the transition from the passive to the active position and exerted essentially perpendicularly to the fabric section GA is converted into a pulling movement in this fabric section GA, with which the fabric section GA moves a little through the associated spreader 7 in Weaving direction W is drawn. In the active and passive position and when moving the plunge edge 41 from the active position to the passive position, no increasing pressure or tension that overcomes the frictional resistance acts on the corresponding tissue section GA on the part of the

Pulling device 30, which therefore does not result in a movement according to the invention of this tissue section GA relative to the temple 7.

Due to the periodic back and forth movement caused by the displacement device 10 and the superimposed, synchronized pivoting movement of the rocker arm 33, the respective plunge edge 41 also acts periodically on the respective tissue section GA and deflects it upwards during a half period. In the second half, in which the

Displacement device 10 in particular the fabric table 5 and the

The rocker arm 33 moves against the weaving direction W, the plunge edge 41 pivots downward, the pressure on the corresponding

The fabric section GA subsides and the plunge edge 41 is no longer able to overcome the frictional resistance that the fabric section GA experiences from the temple 7.

Overall, the pulling device 30 according to the invention results in a more uniform tie point line in the fabric G, since the pulling device 30 reduces the frictional resistance that occurs in the prior art

Helps to overcome fabric sections GA guided by the temple, so that these execute the same large movements in and against the weaving direction as the fabric sections GA not passed through the temple.

The present invention is not limited to the illustrated and described exemplary embodiment. Modifications within the

Claims are also possible. For example, with several fabric webs woven next to one another on a weaving machine, it is possible that adjacent edge-side fabric sections of these fabric webs are guided by a common or two separate spreader bars, with a common or two separate drawing devices according to the invention being arranged behind the spreader bar or bars in the weaving direction.

List of reference symbols

1 device

3 reed

3a pivot axis of the reed

4 air nozzles

5 fabric table

5a trough-shaped receptacle

6 support profile

7 temple spreaders

8 temple axis

9 suspension

10 sliding device

12 thrust levers

13 pendulum roller

14 roller axis

15 spacer

16 pivot axis

17 role

18 roller axis

20 support structure

21 linear profiles

24 backdrop

25 trajectory

30 pulling device

32 seesaw

33 rocker arm

34 swivel axis

35 journals

36 swivel bearings

38 guide section

39 roller

39a roller axle

40 immersion bodies

41 dip edge

BP tie point line

A Swivel direction of the reed

G fabric

GA tissue section

W weaving direction

S direction of fire

Claims

Patent claims

1. Device (1) for equalizing the tie point line (BP) when weaving terry cloth, with a fabric table (5) and a

Displacement device (10) for periodically moving the

Fabric table (5) in and against the weaving direction (W) for producing loops, which can be moved along with the displacement device (10)

Spreaders (7) are arranged in the lateral edge areas of the fabric (G) in the weaving direction behind the binding point line (BP), characterized in that in the weaving direction behind each temple (7) a pulling device (30) movable relative to the displacement device (10) for

Pulling through the guided by the respective temple (7)

Fabric section (GA) is arranged by the temple (7) when moving the displacement device (10) in the weaving direction (W).

2. Device (1) according to claim 1, characterized in that each

The drawing device (30) is mechanically coupled to the displacement device (10) and is moved together with the displacement device (10) periodically in and against the weaving direction (W).

3. Device (1) according to at least one of the preceding claims, characterized in that the periodic shifting movement of the displacement device (10) is linear and the pulling device (30) executes an additional periodic rotational movement.

4. Device (1) according to at least one of the preceding claims, characterized in that the pulling device (30) is arranged and set up in such a way that it exerts pressure on the tissue section (GA) to be pulled only from the top or bottom Pressure is preferably directed perpendicular to the tissue (G) and whereby through this pressure the tissue section (GA) is pulled through the associated temple (7).

5. Device (1) according to at least one of the preceding claims, characterized in that each pulling device (30) comprises a plunger (40) with a plunging edge (41) which preferably runs parallel to the firing direction (S) and which is periodic with the periodic movement of the Displacement device (10) between a passive position and a

Active position is moved back and forth, with the plunging edge (41) being pressed relatively further into the tissue section (GA) in the active position than in the passive position, and whereby during the movement from the passive position to the active position in the direction of the tissue section (GA ) exerted pressure of the diving edge (41) of the tissue section (GA) is pulled through the associated temple (7).

6. Device (1) according to claim 5, characterized in that the

Immersion edge (41) of each immersion body (40) also dips into the tissue section (GA) in the passive position.

7. Device (1) according to claim 5 or 6, characterized in that each pulling device (30) has a guide section (38) which can be moved along a fixed link (24), the trajectory (25) of the link (24) and the distance covered by the displacement device (10) determine the immersion depth of the immersion edge (41).

8. Device (1) according to claim 7, characterized in that said guide section (38) has a roller (39) which rolls on the link (24) when the displacement device (10) is moved in and against the weaving direction (W) .

9. Device (1) according to claim 7 or 8, characterized in that the pulling device (30) comprises a rocker (32) which is parallel to the

The firing direction (S) and between the guide section (38) and the plunge edge (41) arranged pivot axis (34) as well as a rocker arm (33) extending on both sides of the pivot axis (34) and the guide section (38) with the immersion body (40) connects, and wherein the rocker (32) when moving the

Displacement device (10) due to the movement of the

Guide section (38) is pivoted on said gate (24) about the pivot axis (34).

10. Device (1) according to one of claims 5 to 9, characterized in that said dip edge (41) is a distance of less than 5 cm, preferably less than 3 cm, particularly preferably less than 1 cm, to the respective temple (7 ) having.

11. Loom, in particular terry loom, with a device (1) according to one of claims 1 to 10.