EP0443343A1 - Seersucker device - Google Patents

Abstract

What is described is a device for producing a seersucker fabric on a loom, a device bringing about a length addition for the fancy or pile warp yarns (14) in comparison with the basic warp yarns (24) at the tying point (5) of the fabric, being assigned to the loom on the exit side and at the same time ensuring that, on the entry side of the loom, the fancy or pile warp yarn set (14) is so relieved of tension that, as far as possible, it does not move back towards the pile warp beam (15). …<??>The device according to the invention achieves a length addition of 41 % and above, in comparison with length additions in the state of the art in the range of 30 to 32 %, specifically in a fault-free, highly uniform seersucker fabric. …<IMAGE>…

Description

The invention relates to a device for producing a seersucker fabric on weaving machines, whereby the finished fabric consisting of base warp threads, effect or pile warp threads and weft threads has an oscillating forward and backward movement superimposed on the binding point of the normal fabric withdrawal movement in a 1: 1 rhythm, equal to the plain weave characteristic of seersucker , is communicated in such a way that the effect or pile warp threads are given a length allowance in comparison to the basic warp threads and the device is connected to a drive derived from the main gear of the weaving machine.

In the devices used so far, the necessary differential movement between the base warp sheet and the effect or pile warp sheet is achieved so that the length allowance was achieved by the naturally different tensions (tension difference between the effect or pile warp sheet and the base warp sheet). These different tensions are achieved in the prior art by a different drive of the pile warp beam compared to the basic warp beam of the weaving machine. However, this means that the intended length addition for the effect or pile warp threads can only be achieved more or less by chance. It is therefore only possible to adjust the length allowance with relatively large variations. So far, when the weft thread is struck, the slightly more smoothly adjusted effect or pile warp threads are carried more strongly than the base warp threads, which results in the desired length addition. However, this can only be reproduced with large scatterings, so that the fabric, produced with such a known device, is very uneven in itself, especially when a large length allowance is involved was requested. With these known devices, length additions of up to approximately 30 to 32% can be achieved.

This is where the invention comes in, which is based on the object of proposing a device with the features mentioned at the outset, with which fabrics with noticeably larger length allowances for the effect or pile warp threads can be produced, which are furthermore distinguished by a very substantial homogenization of the fabric structure.

To achieve this object, the invention is characterized in that on the output side of the weaving machine, after the weaving point of the fabric, a first shaft, which extends over the width of the weaving machine, is rotatably supported at its free ends by a bearing accommodated in the respective weaving machine housing wall and is close of the bearing in question, an eccentric disc is fixedly connected to the first shaft and each eccentric disc is operatively connected to a scanning roller of a roller lever arranged rotatably on a bearing plate, and wherein each roller lever is connected via a coupling to a clamp holder which is oscillating in the area of the aforementioned bearing plate and wherein furthermore, the clamp holders receive the free ends of a second shaft extending over the weaving machine width, and which clamp holders are received in a pivot bearing arranged eccentrically to the longitudinal axis of the second shaft.
The first shaft of the device according to the invention is connected in terms of its drive to a drive derived from the main gear of the weaving machine. Further features according to the invention result from the subclaims and the following description of the invention.

The inventive task is solved by this measure. It is now possible to achieve a much higher length allowance with absolutely precise, even processing of the fabric is in the range of 41% or more. It is therefore essential that the already finished fabric is informed of the oscillating motion, while at the same time ensuring that the effect or pile warp yarn array does not back away from the actual weaving machine during this oscillating motion to the pile warp beam. This is achieved by a particularly smooth guidance of the effect or pile warp threads on the inlet side.

The oscillation movement can be generated in several ways. So it is also conceivable, for example, to provide two mutually displaceable rollers, each of which can be fed onto the tissue, the rollers then picking up the tissue between them in the manner of a shear effect and being pivotable at right angles to the plane of the tissue, so that this also results in one Back and forth movement of the tissue is achieved.

In the prior art, it is also known to drive a swivel arm on the superstructure console in an oscillating manner, but this alone does not achieve the required uniformity of the fabric, because of the frictional losses in the weaving machine compartment and the length and great elongation of the yarn to the point of binding of the tissue, the uniform processing of the tissue cannot be achieved.
In this context, the invention therefore treads a completely new path in that it is proposed for the first time that the oscillating movement only be carried out on the exit side of the weaving machine and thus on the finished fabric, that is to say behind and as close as possible to the weaving point of the fabric, which is crucial.

In order to relieve the effect of the effect or pile of warp threads on the inlet side of the weaving machine, it is preferred if the pivotable arm arranged behind the pile warp beam with the deflecting shaft is designed with as little mass as possible. The deflecting shaft will be designed as a hollow shaft and the swivel arm with its deflecting shaft will be made of light metal (light material).

It is also important for this that the pile chain is driven by a motor which can be controlled as precisely as possible in terms of speed and torque.

In this context, it is also important if the swivel angle of the swivel arm can be adjusted and the setting made can be monitored precisely.

Fig. 1

eine Seitenansicht einer erfindungsgemäß ausgebildeten Webmaschine mit ausgangsseitig angeordneter Vorrichtung, mit der dem Gewebe die geforderte oszillierende Bewegung mitgeteilt wird;

Fig. 2

in gegenüber Fig. 1 vergrößertem Maßstab, die Vorrichtung mit der die oszillierende Bewegung dem Gewebe mitgeteilt wird.

The invention is explained in more detail below on the basis of an exemplary embodiment from which further important features result. It shows:

Fig. 1

a side view of a weaving machine designed according to the invention with a device arranged on the output side, with which the required oscillating movement is communicated to the fabric;

Fig. 2

on an enlarged scale compared to FIG. 1, the device with which the oscillating movement is communicated to the tissue.

A conventional weaving machine is provided, which is still modified on the inlet side, as will be explained in more detail below. The device 1 according to the invention is provided on the outlet side, which is arranged in the vicinity of the drawing-in roller 2 of the weaving machine and over which the fabric 3 runs (cf. FIG. 1).

From the outlet of a pile warp beam 15, effect or pile warp threads 14 run into a shed 4, a binding point 5 being defined in a conventional manner.

Shafts 6 are available. In the area of the shafts, the compartment 4 is thus arranged as a front compartment, while the rear compartment 7 is arranged beyond the shafts.

There are two groups 8, 9 of warp thread monitors 10 which monitor the thread entry, the groups 8 of the thread monitors 10 for the effect or pile warp threads 14 and the group 9 of the thread monitors 10 of the base warp threads 24 being used for monitoring.

There is also a smooth-running, low-mass, easily pivotable sensor shaft 11 on a superstructure bracket 25 of the machine, which is mounted on a swivel arm 12.

A deflection shaft 13 is also fixedly arranged on the superstructure bracket 25 and serves to deflect the effect or pile warp threads 14 which are pulled off the pile warp beam 15.

The pivot arm 12 is pivotally mounted, its pivot point 16 being adjustable in the arrow directions 17. This makes it possible to influence the rear compartment 7 in the altitude.

The sensor shaft 11 has the task of acting simultaneously as a coating roller and as a dancer roller. It is important here that the effect or pile warp yarn sheet 14 is not divided by the arm 12 itself, because the sheet is deflected beyond the arm 12 via the sensing shaft 11.

It is now important that the effect or pile warp yarn sheet 14 is introduced into the shed 7 with the least frictional resistance and with the lowest possible tension in order to produce a length addition that is as uniform as possible. This means an addition of length to the effect or pile warp threads 14 in comparison to the length of the base warp threads 24.

It is essential that the pile warp beam 15 is motor-driven by a drive, not shown, via a motor that is precisely regulated in terms of speed and torque, in order to ensure a low-tension draw-off of the effect or pile warp threads 14.

The swivel arm 12 is acted upon in the arrow direction 18 by a spring arrangement (not shown in more detail), so that it receives a certain pretension in the arrow direction 18 in order to load the effect or pile warp thread assembly 14 with a pretension, which, however, is very slight.

The sensing shaft 11 thus pivots about the pivot point 16 in the arrow directions 18, 19 shown.

The swivel arm 12 serves as a sensing arm. That is, at position 20, a machine-specific proximity switch is arranged, to which a corresponding actuating element 21 on the sensing arm 12 is assigned.

The distance 22 between these two elements is closely monitored by control electronics. This distance 22 is used as a control variable for controlling the speed of rotation for driving the pile chain beam 15. This ensures that the set of effect or pile warp threads 14 is always pulled off the pile warp beam 15 with a constant tension.

It is important that the swivel arm 12 is designed with as little mass as possible in order to ensure a quick reaction. In order to achieve a low-inertia swivel arm 12, the sensing shaft 11 is formed from a thin-walled, hollow material; Furthermore, the swivel arm 12 is dimensioned as small as possible and made from a light metal material, for example aluminum or the like.

The pivot bearing in pivot point 16 is designed to be as smooth as possible, e.g. designed as a ball bearing.

It is also important that a total of four such arms 12 are arranged in parallel and at a mutual distance from one another in order to control the effect or pile warp thread array 14, but that the sensing arrangement is only arranged on a single arm 12 with respect to positions 20, 21, 22. This is only necessary because the tension of the sheet 14 need only be detected on a swivel arm 12.

The swivel arms 12 are on a common shaft, i.e. thus mounted on a common pivot point 16 which - as stated above - is vertically adjustable in the arrow directions 17.

Starting from the pile warp beam 15, the set of effect or pile warp threads 14 is thus unwound in the direction of arrow 23.

With the device 1 according to the invention, the fabric 3 is allowed to oscillate beyond the binding point 5 in order to achieve the desired high length addition in the case of effect or pile warp threads in comparison to the basic warp threads.

In Figure 2, this device is shown in two different pivot positions.

The device consists in particular of a shaft 44 on which two eccentric disks 45 are arranged in a rotationally fixed manner at a mutual distance. The shaft is supported on the vertical side walls of the weaving machine housing 46. This shaft together with the shaft 36 extend exactly over the entire width of the weaving machine. In the illustration in FIG. 2, only one right eccentric disk 45 is shown, while on the opposite side of the machine 46 a similar, identical eccentric disc is arranged.

On the bearing plate 26, a roller lever 27 is pivotally mounted in a pivot bearing 28, a roller 29 running on the eccentric 45.

The roller 29 is pressed against the eccentric disk 45 via a coupling 30, the coupling 30 consisting in particular of two rod ends 31 and 32, the rod end 31 engaging in an elongated hole 33 and being continuously displaceable there.

The other joint rod head 32 is pivotally articulated on a clamp holder 34, which clamp holder 34 is pivotably mounted in a pivot bearing 35 on the bearing plate 26. The clamp holder 34 clamps a shaft 36, the clamp holder being shown in two different pivot positions. A pivot position is designated with position 34 '.

The function of the device is as follows:

The fabric 3 comes into the device 1 as a dashed line 37 (FIG. 2) and is deflected downward via the shaft 36.

The shaft 36 is driven oscillating in the arrow directions 38 around the pivot bearing 35. The drive takes place via the eccentric disc 45, which rests non-positively on the roller 29. As a result, the roller 29 is deflected around the pivot bearing 28 and, via the infinitely adjustable coupling 30, the clamp holder 34 is pivotally driven in the arrow directions 38 around the bearing 35. So there is an oscillating movement, the frequency of which depends on the speed of the eccentric discs 45. One rotation of the eccentric discs 45 takes place per shot, so that an oscillating movement per Shot takes place.

FIG. 2 also shows how the joint head 31 can be adjusted in the region of notches 39 in the elongated hole 33 and then determined.

This means that settings that have already been made previously and are subsequently changed can be reproducibly set again.

It is therefore a yardstick to achieve a reproducible setting of the effect or pile warp thread processing.

With the device according to the invention according to FIGS. 1 and 2, the entire tissue 3 is informed of an oscillating movement in the arrow directions 40, 41. This ensures that the effect or pile warp sheet 14 and the base warp sheet 24 are carried forward in the direction of arrow 41, but when moving back in the direction of arrow 40, the smoothly pivoting arm 12 ensures that the effect or pile warp sheet 14 remains, while the base warp sheet 24, which is under higher tension, due to its spring load, is relieved and thus decreases. The spring loading is achieved in a manner known per se by the basic match tree 42, which is spring-loaded and thus braces the basic warp thread family in the direction of arrow 40.

Thus, when the fabric (device 1) moves back in the direction of the arrow 40, the base warp thread sheet 24 will move backwards (also in the direction of the arrow 40) and take a larger path, while the pile warp thread sheet 14 is not moved in the arrow direction 40 but remains there.

This creates a difference between the movement of the Basic warp thread group 24 and the effect or pile warp thread group 14, which ensures that the effect or pile warp threads line up at the binding point 5 to form a waveform and thus the desired high length allowance of over 33% (to over 41%) compared to Length of the basic chain takes effect.

The size of the desired length allowance can be set on the coupling 30. A length allowance could thus be set within relatively wide limits, because this only depends on the setting of this device 1.
Experiments by the applicant have shown that length addition of more than 41% is easy to achieve. The maximum upper limit is limited by the fabric properties.

DRAWING LEGEND

• 1 additional device
• 2 feed rollers
• 3 tissues
• 4 shed
• 5 tie point
• 6 shaft
• 7 rear compartment
• 8 group (pile warp threads)
• 9 group (basic warp threads)
• 10 warp thread monitors
• 11 sensor shaft
• 12 swivel arm
• 13 pulley
• 14 pile warp threads
• 15 Polkettbaum
• 16 pivot point
• 17 arrow direction
• 18 arrow direction
• 19 arrow direction
• 20 position
• 21 position
• 22 distance
• 23 direction of arrow
• 24 basic warp threads
• 25 superstructure bracket
• 26 bearing plate
• 27 roller lever
• 28 swivel bearings
• 29 roll
• 30 paddocks
• 31 rod end 1
• 32 rod end 2
• 33 slot
• 34 clamp holder
• 35 swivel bearings
• 36 wave
• 37 line
• 38 arrow direction
• 39 notch (scale markings)
• 40 arrow direction
• 41 arrow direction
• 42 matchstick
• 43 bearings
• 44 wave
• 45 eccentric disc
• 46 weaving machine housing wall
• 47 basic warp beam

Claims (6)

Device for producing a seersucker fabric on weaving machines, whereby the finished fabric consisting of base warp threads, effect or pile warp threads and weft threads is given an oscillating forward and backward movement overlaid at the binding point of the normal fabric pull-off movement in a rhythm of 1: 1, equal to the plain weave characteristic of seersucker that the effect or pile warp threads experience a length allowance in comparison to the basic warp threads and with a drive derived from the main gear of the weaving machine, characterized in that a first shaft (44), which extends over the width of the weaving machine, is rotatably movable at its free ends a bearing (43) accommodated in the housing wall (46) of the weaving machine is borne in such a way that an eccentric disk (45) is connected to the shaft (44) near the respective bearing (43) such that each eccentric disk is rotatably connected to a scanning roller (29) roller lever (27.) arranged on a bearing plate (26) ) is in operative connection that each roller lever (27) is connected via a coupling (30) to an oscillating clamp holder (34), that the clamp holders (34) receive the free ends of a second shaft (36) extending over the weaving machine width and that each clamp holder (36) is received in a pivot bearing (35) arranged eccentrically to the longitudinal axis of the shaft (36). Device according to claim 1, characterized in that the drive derived from the main transmission is operatively connected to the first shaft (44). Apparatus according to claim 2, characterized in that the eccentric discs (45) of the second shaft (36) communicate a forward and backward movement to the weaving machine for each weft. Apparatus according to claim 1, characterized in that the roller lever (27) has an elongated hole (33) which describes a curve and into which an articulated head (31) engages the coupling (30) with the roller lever (27). Device according to claim 4, characterized in that the coupling (30) can be adjusted steplessly or stepwise via the joint head (31) engaging in the elongated hole (33). Apparatus according to claim 5, characterized in that notches and scale markings (39) are provided laterally over the length of the elongated hole (33).

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