DE102008046326A1 - Method and device for observing a course of movement of a weaving machine - Google Patents

Abstract

The invention relates to a method and a device for observing a course of movement of at least one driven element of a weaving machine, preferably at least one weaving shed (1), comprising the steps of: detecting at least one measured value, preferably a plurality of measured values, wherein at least one actual position of the driven element, preferably the heald, at a definable measuring moment in a weaving cycle and / or an actual moment of the weaving cycle upon reaching a definable measuring position of the driven element, preferably of the weaving shed (1), and determining at least one characteristic value of Course of movement based on the at least one detected measured value, preferably on the basis of the detected measured values.

Description

The The invention relates to a method and a device for observing a course of movement of a driven element of a loom, in particular a course of movement of a hive.

A Weaving machine has various driven elements. The movements The individual elements must be timed to each other be the individual elements either over a common drive motor or over several independent Drive motors can be driven.

Weaving looms of a weaving machine usually perform a linear movement between an upper (reverse) position and a lower (reverse) position. To drive the heddle shafts usually a gear is required, which converts a rotational movement of a drive motor in the linear movement. Possible drive gears are for example in WO 2004/092465 A1 or WO 2004/092466 A1 whose contents are hereby fully incorporated by reference. The movement of a weave via a weaving cycle or several weaving cycles, which determine a weave pattern, based on moments of the weaving process or the weaving cycle, is referred to in the sense of the invention as the course of movement of the weave. As Webmuster several Webzyklen are designated, after which the movement of the Webschaft, or another driven element, repeated.

From the JP 59-192749 It is known to attach metal parts on one side of a Webschafts and sensors on a side opposite the side part of a loom. The metal parts are attached to the side at fixed intervals and are guided past the sensors successively during a movement of the weaving shank. When passing a metal part, a signal is generated by the sensor, wherein the successive signals are counted. By counting the signals, an opening of the shed can be determined, whereby a desired maximum opening angle can be determined.

The trajectory of the heald may be adjusted to various web conditions by adjusting various actuators, such as a stroke adjustment screw, cam selection, or the like. Such an adaptation is, for example, also in EP 0 520 540 A1 described. A setting is usually done manually. However, it is difficult or impossible to determine if the various manually adjustable actuators have been properly adjusted.

From the JP 2000-064144 It is known to determine an expected desired position of a heald due to the kinematics of a coupling gear from a movement of an associated drive and to verify that this target position is reached by sensors, so as to close errors in the course of movement.

It It is an object of the present invention to provide a method and a device to watch for a course of motion that gives it a Allows users to easily, preferably during a web operation to check the movement history and / or analyze.

These Task is solved by the objects of Claims 1 and 9. Advantageous embodiments result from the dependent claims. The task becomes particular solved by a method for observing a course of motion at least a driven element of a loom, preferably at least of a hive, comprising the steps of capturing at least one of Measured value, preferably a plurality of measured values, wherein at least one Actual position of the driven element, preferably the heald, at a definable measuring moment in a weaving cycle and / or a Actual moment of the weaving cycle when a definable measuring position is reached of the driven element, preferably of the heald and determining at least one characteristic value of the Course of movement based on the at least one recorded measured value, preferably based on the acquired measured values.

The number of necessary measured values for detecting or monitoring the course of movement of the element is dependent on a complexity of the associated movement profile, in particular on a number of possible adjustable manipulated variables, by means of which a course of movement can be influenced. When more readings are taken, error correction is possible to improve the quality of the observation. To observe the course of motion of a hive, preferably three or four measured values are recorded. The characteristic values recorded by the observation can be directly analyzed and / or evaluated during weaving operation and / or fed to a subsequent analysis. By observation, it is possible to detect the entire course of movement of the element and / or individual characteristic values, in particular to record digitally. In addition, it is possible to conclude from the measured values on further boundary conditions. For example, it can be determined how many heald frames are provided, whether certain Heald frames are present and the like.

In an embodiment of the method is provided that as a characteristic Value at least one parameter of the course of motion of the driven Elements of the group comprising an amplitude, a height offset and an angular offset is determined. A possible course of movement is usually known in advance and / or can by an approx Sinusoidal curve approximated, so that by determining individual parameters of the entire movement history can be reconstructed at least in an approximation. Depending on the complexity of the movement process can These parameters may be sufficient to control the entire movement map.

In another embodiment of the method is provided that as a characteristic value at least one characteristic position of a weave from the group comprising an upper position, a determined the lower position or an intermediate position of the hive becomes. The position of the weave can be absolute, for example with respect to a subsurface, or relative, for example with respect to a crossing position several healds be determined. As intermediate position becomes any position between the upper position and the lower position. Preferably, an intermediate position can be detected at which several healds move up or down as expected, cross.

In A further embodiment of the method provides that as characteristic value at least one parameter of a coupling mechanism between a drive motor and at least one heald the group comprising a cam shape, a stroke and an eccentricity an eccentric of a dobby or an eccentric mechanism is determined. It is possible to analyze if a target value of a manually set actuator, for example of a hub, matches an observed actual value. In the event of a mismatch, the user may be given a corresponding one Note for a necessary correction to be delivered.

In Yet another embodiment of the method is provided, that before watching the course of motion characteristic Values of several possible movement courses in Dependence of at least one adjustable adjusting element, in particular as a function of at least one adjustable control element a coupling mechanism between a drive motor and a Weaving, to be determined. The characteristic characteristic in advance Values can be stored in tabular form or the like so that based on the measurements the characteristic Values and thus a certain course of movement from the table are readable.

In A further embodiment of the method provides that the at least one characteristic value of the course of movement during weaving, in slow motion and / or during a standstill is observed. In particular, by the possibility of the course of movement In weaving operation, it is possible to influence to consider the course of movement, which only through a dynamic movement of the driven element emerge. In some cases, however, it may be beneficial to the to ascertain characteristic values in a slow motion, so to speak to intervene correctively.

In a further embodiment of the method is further provided that the at least one characteristic value and / or the observed Motion history is displayed graphically. The graphic representation can during web operation, preferably in real time, and / or in a subsequent analysis.

In a further embodiment of the method is further provided that the determined characteristic value with an associated Target value is compared. It is thus possible to one Users to give advice, such as possible adjustable manipulated variables to be corrected. In other embodiments, a setting is done the manipulated variables self-regulating, with control strategies can be provided to make sudden changes to prevent the manipulated variables. In a subsequent Analysis, it is possible the quality of weaving depending on the observed movement.

The The object is further achieved by a device for observing a movement of a driven element of a loom, preferably a weaving shed comprising detecting means for detecting at least one measured value, preferably a plurality of measured values, wherein at least one actual position of the driven element, preferably of the weave, at a definable measuring moment in a weaving cycle and / or an actual moment of the weaving cycle when a definable measuring position is reached of the driven element, preferably of the heald, detectable is, and an evaluation device, by which at least one characteristic Value of the course of movement based on the at least one detected Measured value, preferably based on the detected measured values is.

In one embodiment, the detection device comprises a camera, in particular a digital camera. Through the camera it is possible that driven element preferably the heald to record in at least one measuring moment and / or in at least one measuring position. Depending on the design of the camera, a snapshot or a movement recording is possible in order to observe the course of the movement.

In In one embodiment, the detection device alternatively or additionally comprising at least one sensor from the group Hall sensors, distance sensors, laser sensors and optical sensors, on. Through such sensors individual positions are reliable detectable. Depending on the design of the sensor can be such a cost-effective Detection device are created with high robustness. By the determination according to the invention, which under Consideration and / or knowledge of conceivable courses of motion is done, it is possible to inexpensive digital Sensors to use. It may be sufficient for a sensor merely signals the reaching of a measuring position.

In In another embodiment, the evaluation device is formed by at least one characteristic position of the movement history the group comprising an upper position, a lower position or an intermediate position, at least one parameter of the course of motion of the group comprising an amplitude, a height offset and an angular offset and / or at least one parameter of a Coupling mechanism between a drive motor and the aborted Element, preferably the weave, from the group comprising a Cam shape, a stroke and an eccentricity of an eccentric a dobby or an eccentric mechanism to detect.

In According to an advantageous embodiment, the device comprises at least a memory device coupled to the evaluation device, where in each case at least one characteristic value of several courses of motion as a function of at least one adjustable manipulated variable the coupling mechanism is stored in the memory device. The characteristic values are in advance by suitable tests ascertainable, wherein a setting adjustable control variables with high precision, for example using high-resolution measuring sensors and the like. In web mode, it is then possible the manipulated variables initially manually without To set auxiliaries and the set manipulated variables possibly due to the observed characteristic values to correct.

In a further embodiment is further a display device for a graphic representation of the at least one characteristic Value and / or the observed course of motion. The Graphical representation enables easy evaluation of the observed course of motion.

In According to an advantageous embodiment, the evaluation unit comprises means, around the observed course of motion with a desired movement course to compare. The user can be given hints be, for example in the form of acoustic and / or optical Signals, such as the observed course of motion to a target movement course can be adjusted.

Further Advantages of the invention will become apparent from the dependent claims and from the following description of embodiments of the invention, which are shown schematically in the drawings. For the same or similar components are in the Drawings used uniform reference numerals. As part of a Embodiment described or illustrated features can as well in another embodiment used to form a further embodiment of the invention to obtain.

In show the drawings:

1 a partially sectioned front view of a drive for heddle with a detection device according to the invention;

2a FIG. 4: a view of a signal generator unit integrated or attachable to a heald frame for the detection device according to the invention according to FIG 1 ;

2 B : a detail II according to 2a ;

3 FIG. 4 is a view of a detection device attachable to a frame according to FIG 1 ;

4 : possible signals detected by the detection means;

5 : possible motion sequences reconstructed on the basis of the acquired signals;

6 : a graphical representation of an observed position in a side view; and

7 : possible movements depending on different, adjustable parameters.

1 schematically shows a partially sectioned side view of a loom with four heald frames, wherein in 1 only a weave 1 is visible. 1 further shows an associated drive 2 , which via a coupling gear 3 with the weave 1 is coupled. The drive 2 includes a non-visible drive motor with a Drive shaft, which in a housing 4 is arranged. The drive shaft is designed as an eccentric shaft. The rotational movement of the invisible drive shaft is via the coupling gear 3 in a schematically represented by an arrow P linear movement of the heald 1 transformed. The coupling gearbox 3 comprises in the illustrated embodiment, a coupling rod 31 , a connecting rod 32 , two angle levers 33 . 34 , two transmission elements 35 . 36 and a transmission rod 37 , In the illustrated embodiment, a connection between the coupling rod 31 and the connecting rod 32 through an adjusting screw 5 variable. Next is a height of the webshaft 1 through an adjusting screw 6 on the frame of the webshaft 1 adjustable. The illustrated coupling gear 3 is just an example. Other conceivable coupling gears are, for example, in WO 2004/092465 A1 and or WO 2004/092466 A1 described, the scope of which is fully incorporated herein by reference. The drive shaft and the drive motor may be connectable to one another in various relative angular positions so as to achieve a desired angular offset. It is for example from the WO 98/31856 , the contents of which are also incorporated by reference, known to provide a gear which allows different relative angular positions. In other embodiments, other means for adjusting and / or adjusting an angular offset are provided.

According to the invention, a device for observing a course of movement of the heald 1 intended. The device comprises a detection device 7 , which in the illustrated embodiment with a signal generator unit 8th cooperates, and a schematically illustrated evaluation 9 ,

In the illustrated embodiment, the detection unit 7 arranged so that they are connected to one at a lateral edge of the heald 1 provided signal transmitter unit 8th interacts. Of course, this position is merely exemplary and there are other positions, for example above and / or below the heald 1 for an arrangement of the detection unit 7 conceivable.

The illustrated detection device 7 has magnetic sensors which are connected to the signal transmitter unit 8th cooperate arranged magnets. One possible arrangement of the magnets and the magnetic sensors is associated with the 2a . 2 B and 3 described in more detail. In other embodiments, other sensors and / or arrangements may be provided.

2a schematically shows the signal transmitter unit 8th according to 1 , The illustrated signaling unit 8th includes one on the weave 1 attachable rail 80 , on which four pairs of magnets, each having a first magnet 8a and a second magnet 8b have, are attached. At the rail 80 are position pins 82 intended for exact positioning of the magnets 8a . 8b , The position pins 82 can be removed during operation. The rail 80 is with the weave 1 according to 1 connectable, for example glued and / or screwed. In other embodiments, the magnets 8a . 8b directly on the webshaft 1 appropriate. 2 B schematically shows a pair of magnets 83 with the magnets 8a . 8b in an enlarged view. As in 2 B recognizable, are the magnets 8a . 8b each formed as a bar magnet, wherein the two bar magnets are arranged in a different orientation. Accordingly, at one of the detection device 7 facing surface of the signal transmitter unit 8th formed a magnetic field.

3 schematically shows a detection device 7 according to 1 , The detection device 7 includes twelve magnetic sensors 71a to 71c . 72a to 72c . 73a to 73c and 74a to 74c , which are arranged in four columns. Each column is a hedge 1 according to 1 assigned, so that by the illustrated detection device 7 Course of movement of the four healds 1 according to 1 are observable. The magnetic sensors or Hall sensors are equipped with an electronic detection device 70 connected to the evaluation unit 9 according to 1 connected is. In other embodiments, the sensors can be arranged on the heald. Preferably, however, the sensors are arranged on the frame, so that a simple wiring is possible.

Through the sensors 71a to 71c . 72a to 72c . 73a to 73c and 74a to 74c are the fields of magnet pairs 8a . 8b according to 2a and 2 B detectable.

4 schematically shows magnetic fields, wherein on the abscissa a distance from a center of the magnet pair 8a . 8b in an x-direction according to 2a and 2 B and a field strength is plotted on the ordinate. Here are in 4 three magnetic field signals I . II . III represented, which differ in their maximum field strength. To determine the three magnetic field signals I . II . III became a distance of the magnet pair 8a . 8b from the detection device 7 in a y-direction according to 2a and 2 B changed, taking a the magnetic field signal I underlying distance is less than a magnetic field signal II and III underlying distance. The smaller the distance in the y-direction, the greater the maximum field strength. In any case, however, a direction of the detected magnetic field changes as it passes fen of a "0-position". Due to the change of direction of the magnetic field, this position can be reliably detected independently of a magnitude of the magnetic field. Since the distance in the y-direction changes in the weaving operation, it is advantageous that the change of direction takes place independently of the distance in the y-direction and thus the position can be reliably detected.

In the illustrated embodiment, three sensors each 71a . 71b . 71c and four magnet pairs 8a . 8b intended. A distance B between the magnet pairs is almost constant in the illustrated embodiment and is for example B = 25 mm. A distance C between two sensors 71a . 71b . 71c the detection device 7 according to 3 is also almost constant, and is for example C = 37.5 mm, ie 1.5 × distance B. The sensors 71a . 71b . 71c and the magnet pairs 8a . 8b For example, are arranged such that the bottom magnet pair 83 according to 2a above a lower sensor 71c is arranged when the weave shaft 1 according to 1 is in an upper position. Upon a downward movement from this upper position, one magnet pair after the other then becomes over the position of the lower sensor 71c guided. It can easily a detected signal a particular pair of magnets 8a . 8b be assigned. Through the sensor 71c Thus, four signals according to 5 for a weave 1 according to 1 be recorded, ie the achievement of four positions is detectable. Through the other sensors 71a . 71b In the exemplary arrangement it is possible to detect a new signal at a distance of 0.5 × B, after a movement of 12.5 mm.

Based on these signals, moments as part of a weaving cycle can be determined as measured values to which the weaving shaft 1 certain positions.

According to the invention, on the basis of these measured values, at least one characteristic value of a course of movement and / or the entire course of movement of the heald 1 reconstructed.

5 schematically shows a graphical representation of two trajectories, in each case the moments or angular positions at which the specific positions were reached, as measured values P1, P2 and P3 or P1 *, P2 * and P3 * are drawn. It can be seen that a first course of movement represented by a solid curve matches the measured values P1, P2, P3, whereas a second course represented by a dashed line matches the measured values P1 *, P2 *, P3 *. From the measured values P1, P2 and P3 or P1 *, P2 * and P3 * can thus determine which course of motion is given. Conversely, for example, by means of the adjusting screw 5 and / or the adjusting screw 6 according to 1 completed settings.

The course of movement of the heald frames 1 can be graphically rendered for analysis. In addition to the in 5 illustrated illustration of the course of movement on the angular position, it is also possible, an opening of the heald frames in a side view, as shown schematically in FIG 6 shown, for each moment of the weaving cycle and / or angular positions graphically prepare and thus to provide the user.

As already mentioned, the movement patterns of a hive are 1 and / or other, driven elements of the loom depending on different variables or parameters. 7 schematically shows five different courses of movement of heddles, depending on different variables or parameters. On the basis of the values detected by the device according to the invention, it is possible to determine which of the 7 actual possible movement trajectories is actually present. The determination of an associated course of movement is possible for example by means of a so-called compensation calculation (narrow curve fitting) or the like. However, the determination of an associated course of motion preferably takes place on the basis of tables or the like in which desired values for possible movement profiles are stored. By comparing the measured values with the desired values, a movement profile and / or an associated characteristic value can be determined. The values of the tables can be determined by experiments or the like in advance and the values can be stored in a suitable memory device.

In the in 7 illustrated embodiment, a stroke length by means of the adjusting screw 5 according to 1 , a height of the webshaft 1 by means of the adjusting screw 6 according to 1 and an angular offset, for example, by changing the relative angular position between the drive shaft and the drive motor varies. A dotted first curve 1 shows the course of movement at a stroke length of 80 mm, a height offset of 0 mm and an angular offset of 0 °. In the second curve 2 shown in solid lines and the third curve 3 shown with a semicolon, the stroke lengths were varied with respect to the first curve 1. The stroke length is at the second curve 2 100 mm and at the third curve 120 mm. In the curves 4 and 5, the height offset or the angular offset with respect to the second curve 2 shown by the solid line were varied. In contrast to the course of motion represented by the second curve 2, the height offset is in the case of a stroke-colon cure 4 motion sequence shown set a height offset of 20 mm. In the course of movement represented by a dashed curve 5, an angular offset was varied with respect to the course of movement represented by the solid curve 2. In this case, in the course of movement according to curve 5, the angular offset is 20 °. In 7 the ordinate is divided at a distance of 12.5 mm. This subdivision corresponds to the distance of 0.5 × B in the above numerical values. This makes it possible to determine the points of intersection of the illustrated curves 1 to 5 with the scaling lines running parallel to the abscissa by sensors, for example the Hall sensors. Based on these points, an associated curve and thus an associated course of motion can be determined.

The Intersections of conceivable curves can be stored in tables be, for example, in the Web operation on reaching the Position 12.5 mm present angular position detected and with the values the table is compared. Based on the comparison, at least a characteristic value of the present course of motion and / or the course of the movement can be determined as a whole.

The determination and / or the graphic processing of a determined or observed course of motion is possible according to the invention in weaving operation, preferably in real time. Here, a user can set instructions for setting manipulated variables, such as the adjusting screw 5 and / or the adjusting screw 6 according to 1 to provide. The determination and / or graphical processing is possible both in normal and in a slow-speed.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• WO 2004/092465 A1 [0003, 0034]
• - WO 2004/092466 A1 [0003, 0034]
• - JP 59-192749 [0004]
• - EP 0520540 A1 [0005]
• JP 2000-064144 [0006]
• WO 98/31856 [0034]

Claims (15)

Method for observing a course of movement of at least one driven element of a weaving machine, preferably at least one weaving machine ( 1 ), comprising the steps of: a. Detecting at least one measured value, preferably a plurality of measured values, wherein at least one actual position of the driven element, preferably the heald, at a definable measuring moment in a weaving cycle and / or an actual moment of the weaving cycle upon reaching a definable measuring positions of the driven Elements, preferably of the hive ( 1 ), and b. Determining at least one characteristic value of the course of movement based on the at least one detected measured value, preferably on the basis of the detected measured values. Method according to claim 1, characterized in that that as a characteristic value at least one parameter of the course of motion the driven element of the group comprising an amplitude, a height offset and an angular offset is determined. A method according to claim 1 or 2, characterized in that as characteristic value at least one characteristic position of a hive ( 1 ) is determined from the group comprising an upper position, a lower position or an intermediate position of the heald. Method according to claim 1, 2 or 3, characterized that as characteristic value at least one parameter of a Coupling mechanism between a drive motor and at least a weave from the group comprising a cam shape, a Stroke and an eccentricity of an eccentric of a dobby or an eccentric mechanism is determined. Method according to one of Claims 1 to 4, characterized in that characteristic values of a plurality of possible courses of motion as a function of at least one adjustable setting element, in particular as a function of at least one adjustable setting element ( 5 . 6 ) a coupling mechanism ( 3 ) between a drive motor and a heald ( 1 ). Method according to one of claims 1 to 5, characterized in that the at least one characteristic Value of the course of movement in web mode, in slow motion and / or is observed during a standstill. Method according to one of claims 1 to 6, further comprising the step c. graphical representation of the at least one characteristic value and / or observed Movement profile. Method according to one of claims 1 to 7, further comprising the step d. Compare the determined characteristic value with an associated target value. Device for monitoring a movement of a driven element of a weaving machine, preferably a heald ( 1 ), comprising a detection device ( 7 ) for detecting at least one measured value, preferably a plurality of measured values, wherein at least one actual position of the driven element, preferably of the heald ( 1 ), at a definable measuring moment in a weaving cycle and / or an actual moment of the weaving cycle when a definable measuring position of the driven element, preferably the weaving sheaf ( 1 ), and an evaluation device ( 9 ), by which at least one characteristic value of the course of motion can be determined on the basis of the at least one detected measured value, preferably on the basis of the detected measured values. Device according to claim 9, characterized in that in that the detection device is a camera, in particular a digital camera includes. Apparatus according to claim 9, characterized in that the detection device ( 7 ) at least one sensor from the group comprising magnetic sensors ( 71a , ..., 74c ), in particular Hall sensors, distance sensors, laser sensors and optical sensors. Device according to one of claims 9 to 11, characterized in that the evaluation device ( 9 ) is formed around at least one characteristic position of the movement pattern from the group comprising an upper position, a lower position or an intermediate position, at least one parameter of the movement profile from the group comprising an amplitude, a height offset and an angular offset and / or at least one parameter a coupling mechanism ( 3 ) between a drive motor and the aborted element, preferably the heald ( 1 ), from the group comprising a cam shape, a stroke and an eccentricity of an eccentric of a dobby or an eccentric mechanism to detect. Device according to one of claims 9 to 12, further comprising at least one with the evaluation device ( 9 ) coupled memory device, wherein in each case at least one characteristic value of a plurality of movement profiles as a function of min at least one adjustable manipulated variable of the coupling mechanism ( 3 ) is stored in the memory device. Device according to one of claims 9 to 13, further comprising a display device for a graphical representation of the at least one characteristic value and / or the observed course of motion. Device according to one of claims 9 to 14, characterized in that the evaluation unit is formed is to the observed movement history with a target movement course to compare.