EP1394304A2 - Loom operating method - Google Patents

Abstract

Iterative correction values are applied to the fabric take-up motion (6, 7) on a loom based on a comparison of the actual and desired values (Pasterisk) of reed position at the end of the beat-up movement. The reed motion can be linear or part of an arc and the applied force is also controlled. Discrepancies between position values in successive picks can be used to detect an end break. The reed (14) can be driven at both fabric edges, each side being equipped with its own position sensor. The shed can be closed and reopened before, at, or after the return movement of the reed. Also claimed is a computer program to carry out the process and a loom equipped with an appropriate control system.

Description

The present invention relates to an operating method for a weaving machine, iterating a weft through one open compartment formed by warp threads is guided, the Weft thread attached to the edge of the goods by means of a reed the compartment is closed and opened again, so that the warp threads reach around the weft thread and the reed is moved away from the edge of the goods.

Such an operating method is known from the technical article "A MECHATRONICS APPROACH TO THE CONTROL OF PICKSPACING "by R. Eren, I. Porat and K. Greenwood, published in Mechatronics, Vol. 5, No. 2,3, pages 165-182, 1995, Elsevier Science Ltd., known.

In the known operating method, when struck Actual torque occurring is recorded. Based on the actual torque and one The target torque becomes a correction value for a material deduction determined. A material take-off element is made accordingly controlled the determined correction value.

The known operating method already works quite well. Weaving errors, especially in the form of weft streak, can but still cannot be avoided completely. In particular the striking takes place when the weaving machine starts up the weft is uncorrected on the first iteration. Also it can happen that the correction after a thread break not completely done after the first iteration.

The object of the present invention is a Generic operating method to create the Avoid weaving errors (weft streaking) of the prior art become.

• ein Schussfaden wird durch ein von Kettfäden gebildetes geöffnetes Fach geführt,
• der Schussfaden wird mittels eines Riets mit einem Sollmoment bzw. einer Sollkraft an einen Warenrand angeschlagen und eine korrespondierende Istposition des Riets erfasst,
• anhand der Istposition und einer Sollposition wird ein Korrekturwert für einen Materialabzug ermittelt,
• ein Materialabzugselement wird entsprechend dem ermittelten Korrekturwert angesteuert,
• das Fach wird geschlossen und wieder geöffnet, so dass die Kettfäden den Schussfaden umgreifen, und das Riet vom Warenrand weggefahren.

The task is solved by an operating procedure with the following iterative steps:

• a weft thread is passed through an open compartment formed by warp threads,
• the weft thread is attached to a goods edge by means of a reed with a desired torque or a desired force and a corresponding actual position of the reed is detected,
• a correction value for a material deduction is determined based on the actual position and a target position,
• a material take-off element is driven in accordance with the determined correction value,
• the compartment is closed and opened again so that the warp threads grip the weft thread and the reed moves away from the edge of the goods.

Because especially by striking with the target torque or the target force is already in the first iteration after starting the loom the weft is independent chipped correctly from the position of the goods edge.

The weft thread can be knocked against the edge of the goods in a controlled manner become. However, it is preferably torque or force controlled posted on the edge of the goods.

If based on at least two consecutive times If there is breakage detection for the weft thread, become separate weft monitors of the weaving machine superfluous.

If the target position is constant, the process works particularly stable.

If the target torque or the target force is time-dependent, in particular a control for the reed from the outside the process is particularly flexible.

When the reed is moved linearly, the effective force is with who hits the weft regardless of the Actual position of the goods edge. If, on the other hand, the reed is one If the axis is pivoted, the result is a simpler construction. In the latter case, the target torque can - depending on Accuracy requirements - independent of swivel angle or be swivel angle corrected.

If the reed by means of two arranged on both sides of the goods edge Reed drives are used for each of the reed drives the actual position is recorded and based on the actual positions breakage detection for the weft thread can occur a break in the weft can be recognized particularly quickly.

Alternatively, the compartment can be removed after the reed has moved away from the edge of the goods or together with the removal of the reed from the edge of the goods closed or opened again.

FIG 1

eine Webmaschine von oben,

FIG 2

die Webmaschine von FIG 1 von der Seite,

FIG 3

ein Ablaufdiagramm,

FIG 4

ein Detail von FIG 3 und

FIG 5

eine Variante von FIG 2.

Further advantages and details emerge from the following description of an exemplary embodiment in conjunction with the drawings. Show in principle

FIG. 1

a weaving machine from above,

FIG 2

the weaving machine of FIG 1 from the side,

FIG 3

a flow chart,

FIG 4

a detail of FIG 3 and

FIG 5

a variant of FIG 2.

According to Figures 1 and 2, warp threads 1 - in their entirety also called a chain - from a warp beam 2 to led a match tree 3. From there they are guided by thread guides 4, 5 further to a goods take-off roller 6 and one List of goods 7 led. The warp threads 1 are alternating assigned to the thread guide 4 and the thread guide 5. Between the thread guides 4, 5 and the take-off roller 6 is located there is an edge of goods 8, i.e. the border between already woven material (fabric) and the still non-woven warp threads 1.

The weaving machine is controlled by control device 9. The 1 is designed as a microprocessor 9. The control device 9 is therefore programmable. Their function is determined by a computer program 10 with which the control device 9 is programmed. Corresponding the computer program 10 operates the loom, controlled by the control device 9, iteratively following, in Connection with FIG 3 process described in more detail.

First, in a step 21, an upper compartment 11 and a Sub-compartment 12 opened. According to FIG 2, the thread guide 4 upwards, the thread guide 5 deflected downwards. The warp threads 1 guided by the thread guide 4 then form the so-called upper compartment 11, which are guided by the thread guide 5 Warp threads 1 the so-called lower compartment 12. The upper compartment 11 and the sub-compartment 12 together form the so-called compartment.

A weft thread 13 is then passed through the step 22 Compartment guided and in a step 23 by means of a reed 14 struck on the goods edge 8. The striking takes place with a target torque M * that the control device 9 from the outside is specified. The target torque M * can in particular as indicated by the addition "t", be time-dependent. In extreme cases, one can even have 13 for each weft thread own target torque M * can be specified.

In principle, striking with the nominal torque M * is equivalent to strike with a target force. The executions with respect to the target torque M * etc. apply equally also for force-controlled striking of the weft thread 13th

The control device 9 outputs the target torque M * supplied to it proportionately to two controllers 15, 15 '. The controllers 15, 15 ' control reed drives 16, 16 ′, which operate on both sides of reed 14 are arranged. The regulators 15, 15 'regulate the moment of Reed drives 16, 16 '. By means of the reed drives 16, 16 ' so the reed 14 moves in a torque-controlled manner so that it Weft thread 13 with the nominal torque M * strikes the fabric edge 8. In principle, the reed 14 can also be by means of a single reed drive can be moved.

The reed drives 16, 16 'are displacement detection members 17, 17' assigned. The path detection elements 17, 17 'can, for. B. as so-called resolvers 17, 17 'can be formed. By means of the Travel detection elements 17, 17 'continuously become provisional actual positions P, P 'of the reed drives 16, 16' recorded.

As long as the actual positions P, P 'change, that moves 14 still advised, so did not have the weft 13 on the Goods margin 8 posted. As soon as the actual positions P, P ' however, no longer change, the reed 14 is at a standstill has reached, the weft thread 13 has struck the goods edge 8. If the actual positions P, P 'no longer change, are therefore in a step 24 at this time recorded actual positions P, P 'temporarily.

It is then checked in a step 25 whether the weft thread 13 is broken. If this is the case, in a step 26 the weaving machine stopped and the further processing of the program 10 ended. Along with stopping the weaving machine the control device 9 also generates an error message F output. The error message F can alternatively be visual perceptible, an acoustically perceptible or a data technology Error message. The process of recognizing a Thread break will be described later in connection with FIG 4 become.

If, on the other hand, no thread breakage has occurred, in one Step 27 determines a correction value k for a material deduction. The correction value k is based on a target position P * for the reed 14 and the actual positions saved in step 24 P, P 'determined. The target position P * is constant, as can be seen from the lack of any addition. The target position P * is indicated by dashed lines in FIG. Based the correction value k becomes a speed in a step 28 v determined for a material deduction. by virtue of des - of course within a tolerance range - variable goods edge 8 are the actual positions P, P 'as Correction factor can be used to regulate the deduction of goods.

The determined speed v is fed to a controller 18, then a material take-off element 7, here the goods tree 7, correspondingly by means of an associated trigger drive 19 controls. Instead of the merchandise tree 7 could also another material take-off element 6, e.g. the take-off roller 6, can be controlled.

Then in steps 29 and 30 the reed 14 is removed from the edge of the goods 8 moved away and the compartment closed.

The system then jumps to step 21 again. With the current one The iteration also runs through the subject again open, but thread guides 4, 5 swap - at least partially - their positions. Wrap around the warp threads 1 therefore - at least in part - the weft thread 13.

In the method described in connection with FIG 3 the compartment is closed after the reed 14 has moved away from the goods edge 8 and opened again. But it is also possible that Closing the compartment before moving the reed 14 away from the goods edge 8 to execute. It is even possible to close the compartment and to open it again, that is, to reach around the weft thread 13 through the warp threads 1 before the reed 14 from Edge of goods 8 is moved away.

In the following it will be described in connection with FIG. 4 how the thread breakage detection for the weft thread 13 is carried out becomes. According to FIG. 4, this is initially done in a step 31 a deviation δ is determined. The index n in step 31 (and also in step 33) refers to the current iteration, the index n-1 on the previous iteration. The deviation δ is a measure of how much the sum of the actual positions, d. H. P (n) + P '(n), from an expected actual position, d. H. P (n-1) + P '(n-1) + 2k (n-1), deviates. Then in one Step 32 checks whether the amount of the deviation δ is one Threshold value exceeds max1. If this is the case, be on Thread break detected and continued with step 26. It takes place on the basis of successive actual positions P, P 'a breakage detection for the weft thread 13.

If not detected in step 32 on broken weft thread 13 was the deviation δ in a step 33 determined another way. Now the deviation δ gives the displacement between the reed drives 16, 16 'again. Here too is checked again in a step 34 whether the amount of this Deviation δ exceeds a further threshold value max2. If this is the case, it is recognized again for weft breakage and proceed to step 26. Also based on the Actual positions P, P 'of the reed drives 16, 16' as such can thus a breakage detection for the weft thread 13 is carried out become.

5 shows a variant of FIG. 2. In the embodiment 5, the reed 14 is namely about an axis 20 pivoted. In contrast, in the embodiment according to FIG the reed 14 moves linearly. Otherwise, the embodiments correspond according to FIG 2 and 5 with each other.

By means of the operating method according to the invention is in particular when starting the loom from standstill - regardless of whether starting after a weft break or after a normal standstill - immediately a good one Web result achievable without weft streaking. The quality the web result is essentially independent the production speed and the actual positions P, P '. Therefore, especially after a thread break, there is no weft search more needed. The productivity of the weaving machine can be increased.

Claims (16)

Operating method for a weaving machine, with the following iterative steps: a weft thread (13) is passed through an open compartment formed by warp threads (1), the weft thread (13) is attached to a fabric edge (8) by means of a reed (14) with a desired torque (M *) or a desired force and a corresponding actual position (P, P ') of the reed is detected, a correction value (k) for a material deduction is determined on the basis of the actual position (P, P ') and a target position (P *), a material take-off element (6, 7) is driven in accordance with the determined correction value (k), the compartment is closed and opened again, so that the warp threads (1) engage around the weft thread (13) and the reed (14) moves away from the goods edge (8). Operating method according to claim 1, characterized in that the weft thread (13) is attached to the goods edge (8) in a torque or force-controlled manner. Operating method according to claim 1 or 2, characterized in that breakage detection for the weft thread (13) takes place on the basis of temporally successive actual positions (P, P '). Operating method according to claim 1, 2 or 3, characterized in that the target position (P *) is constant. Operating method according to one of the above claims, characterized in that the target torque (M *) or the target force is time-dependent. Operating method according to one of the above claims, characterized in that the target torque (M *) or the target force of a control (9) for the reed (14) is predetermined from the outside. Operating method according to one of claims 1 to 6, characterized in that the reed (14) is moved linearly. Operating method according to one of claims 1 to 6, characterized in that the reed (14) is pivoted about an axis (20). Operating method according to one of the above claims, characterized in that the reed (14) is moved by means of two reed drives (16, 16 ') arranged on both sides of the goods edge (8), that for each of the reed drives (16, 16') the corresponding actual position ( P, P ') is detected and that the actual positions (P, P') are used to detect breakage for the weft thread (13). Operating method according to one of claims 1 to 9, characterized in that the compartment is closed and opened again after the reed (14) has moved away from the goods edge (8). Operating method according to one of claims 1 to 9, characterized in that the compartment is closed and opened again when the reed (14) moves away from the goods edge (8). Operating method according to one of claims 1 to 9, characterized in that the compartment is closed and opened again before the reed (14) moves away from the goods edge (8). Computer program for carrying out an operating procedure according to one of the above claims. Control device for carrying out an operating method according to one of claims 1 to 12. Control device according to claim 14, characterized in that it is programmed with a computer program product (10) according to claim 13. Loom for carrying out an operating process according to one of claims 1 to 12, comprising a control device (9) is provided according to claim 14 or 15.

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