JP2006241614A - Method for suppressing vibration of warp beam in loom and device for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for suppressing vibration of warp beam in a loom and to provide a device for the same, effectively suppressing generation of weaving bar caused of vibration of the warp beam by properly adjusting braking force of a braking means for warp beam. <P>SOLUTION: The invention relates to the method for suppressing vibration of warp beam in a loom comprising suppression of the vibration of the warp beam by preparing another braking means based on at least one parameters effecting on the vibration property of the warp beam different from the driving device for the warp beam. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a warp beam vibration suppression method and apparatus for a loom capable of effectively suppressing vibrations of a warp beam during weaving that may cause a weaving step.

  The warp of the loom is wound as a sheet-like warp sheet on the warp beam, and is sent out according to the progress of weaving while maintaining a predetermined warp tension. Note that the feeding of the warp sheet on the warp beam is controlled by, for example, controlling the rotation of a dedicated feeding motor via a feeding control device that detects the warp tension and the winding diameter of the warp sheet (Patent Document). 1).

The feed motor is connected to the warp beam via a worm gear having a check function. Therefore, the worm gear can apply a braking force against the warp tension to the warp beam, and the feed motor can rotate the warp beam by a predetermined amount while rotating the warp beam against the warp tension.
JP 2003-193355 A

  In such a prior art, the warp beam is given a braking force by the non-return function of the worm gear. There was a problem that weaving may occur. The warp tension applied to the warp sheet on the warp beam greatly fluctuates during one pick (one cycle) due to the opening motion and the beating motion, and acts as a periodic vibration force for the warp beam for each pick. This is because, when the beam vibrates, the warp length from the warp beam to the weave changes, and the position before the weave changes, causing a weaving step. Here, the vibration of the warp beam is a generic term for vibration in the rotation direction of the warp beam and vibration in directions other than the rotation direction.

  Accordingly, an object of the present invention is to effectively suppress the generation of a weaving step caused by the warp beam vibration by appropriately adjusting the braking force of the braking means for the warp beam in view of the problems of the prior art. An object of the present invention is to provide a warp beam vibration suppression method and apparatus therefor that can be used.

  In order to achieve the above object, the first invention according to this application (referred to as the invention according to claim 1, hereinafter the same) has a structure based on at least one of the parameters affecting the vibration characteristics of the warp beam. The gist is to suppress the vibration of the warp beam during weaving by adjusting the braking force to the warp beam by a braking means different from the driving device.

  The parameter can include at least one of a fixed parameter that does not change during weaving and a variable parameter that can change during weaving. The measured value of the physical quantity related to the amount of warp sheet on the warp beam, the measured vibration of the warp beam. The fluctuation parameter may include at least one of a value and an actual measurement value of a physical quantity related to the warp beam vibration.

  The configuration of the second invention (referring to the invention according to claim 4, hereinafter the same) comprises an adjusting means and a braking means different from the warp beam driving device, and the adjusting means is a vibration characteristic of the warp beam. The gist is to suppress the vibration of the warp beam during weaving by adjusting the braking force applied to the warp beam by the braking means based on at least one of the parameters affecting the speed.

  The adjusting means can adjust the braking force of the braking means based on the actual value of the physical quantity related to the amount of warp sheet on the warp beam.

  According to the configuration of the first invention, the warp beam can effectively prevent the occurrence of the weaving step by appropriately adjusting the braking force of the braking means to suppress the vibration. The warp beam is rotationally driven in the feed direction by a dedicated feed motor or by the main shaft of the loom through a worm gear having a check function. Therefore, the braking means is used for such a warp beam. A braking force is applied to the warp beam separately from the driving device. If the braking force of the braking means is too large, the warp beam vibration will be discontinuous, which may cause an extreme mechanical stage, and the load of the delivery motor will be excessive, causing the warp beam to rotate in the delivery direction. There is a risk that the drive system to be driven will be increased in size, and if it is too small, the effect of suppressing warp beam vibration will be insufficient. Therefore, it is necessary to appropriately adjust the braking force of the braking means based on parameters that affect the vibration characteristics of the warp beam.

  The braking means is an electric brake such as a powder brake, an eddy current brake, a torque motor, or a mechanical brake such as a single-plate or multi-plate disc brake, drum brake, or band brake, and the braking force can be varied. Use the format. The braking means preferably applies a braking force to the warp beam itself or a rotating member as close to the warp beam as possible to eliminate torsional distortion of the shaft.

  Parameters that affect the vibration characteristics of the warp beam are broadly classified into fixed parameters that do not change during weaving and variable parameters that can change during weaving. The former can set a fixed value as an initial setting value, and the latter can be set as a setting value that can be changed during weaving, or can be detected as an actual measurement value. However, the actual value here refers to, for example, a target warp tension value from a feeding control device, a target loom rotational speed from a weft insertion control device, an opening, in addition to a physical quantity detected using detection means such as a sensor. It is assumed that the current value of the control parameter of each control device is included, such as the pattern and the weft type.

  Fixed parameters that do not change during weaving include, for example, opening amount, warp line length (cutter length), warp length from warp beam to pre-weaving, weft type, warp type, warp number, weaving width, target warp There are tension, easing amount, etc. Fluctuating parameters that can fluctuate during weaving include loom rotation speed, weft type, opening pattern, weft density, warp sheet amount on warp beam, warp beam vibration . In addition, as a physical quantity related to the amount of warp sheet on the warp beam as a variation parameter, the winding diameter or weight of the warp sheet on the warp beam, the length and position of the warp path corresponding to the winding diameter of the warp sheet on the warp beam, Or there are the contact angle of the warp sheet with respect to the guide roll, the rotational speed in the warp beam delivery direction, and the like. For the warp beam vibration, in addition to using the detected value of the acceleration in a specific direction by the acceleration sensor provided in the bearing case of the warp beam, the warp tension fluctuation range by the load cell for warp tension detection is used as the warp beam vibration. It can be adopted as a related measured value. However, the load cell for detecting the warp tension may be attached to, for example, a tension roller for controlling the rotation of the feeding motor, or may be provided separately from the rotation control for the feeding motor.

  The relationship between these individual parameters and the braking force of the braking means is, for example, as follows.

  With respect to the opening amount, the larger the opening amount, the higher the warp tension at the time of opening, the greater the variation range of the warp tension, and the warp beam is shaken, so that the braking force is increased. Regarding the warp line length (cutter length) and the warp length from the warp beam to the weaving, the longer these lengths, the longer warp tension can absorb the warp tension fluctuation due to the opening motion and the beating motion. Reduce the braking force. Regarding the warp tension, the greater the warp tension, the greater the pulling power of the warp sheet from the warp beam, so the braking force is increased. Regarding the easing amount, the smaller the easing amount, the smaller the correction rate (absorption rate) of warp tension fluctuation due to opening movement, and the pulling force of the warp sheet from the warp beam and the fluctuation range become larger. Enlarge. Regarding the loom rotational speed, the higher the loom rotational speed, the faster the period of the excitation force applied to the warp beam, so the braking force is increased. Regarding the weft density, the higher the weft density, the greater the force required to drive the weft, and the greater the vibration of the loom and the warp beam swaying, so the braking force is increased.

  Each of these parameters affects the vibration characteristics of the warp beam. Therefore, the vibration of the warp beam can be suppressed by appropriately adjusting the braking force of the braking means based on at least one of these parameters. However, since the tendency and magnitude of the influence of each parameter on the vibration characteristics of the warp beam usually differ from one parameter to another, the practice of adjusting the braking force by each parameter is to accumulate data such as a trial test. Shall be determined experimentally.

  According to the configuration of the second invention, the first invention can be implemented as it is. This is because the braking means applies a braking force to the warp beam, and the adjusting means can appropriately adjust the braking force of the braking means based on at least one of the parameters that affect the vibration of the warp beam. However, the parameters and braking means here are the same as the parameters and braking means in the first invention, respectively.

  Therefore, the adjusting means can adjust the braking force of the braking means by outputting an operation amount for adjusting the braking force to the braking means based on, for example, an actual measurement value of the amount of warp sheets on the warp beam. it can. The adjusting means may be configured by an electric circuit including microcomputer software, or may be mechanically configured by combining mechanical members. However, since the operation amount from the adjusting means is output as an electrical signal in the former case and as a mechanical signal in the latter case, the braking means realizes a braking force corresponding to the operation amount in each case. As is possible, the braking force shall be adjusted using an appropriate type and via an appropriate actuator or the like.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The warp beam vibration suppressing device in the loom includes an adjusting means 10 and a braking means 20 (FIGS. 1 and 2). However, the adjusting means 10 in FIG. 1 is configured by software of a microcomputer, for example, and the braking means 20 is a brake that applies a braking force to the warp beam WB. The braking means 20 can adjust the braking force by the operation amount Q from the adjusting means 10 output as an electric signal.

  The warp sheet W from the warp beam WB is pulled out via the tension roller TR and is woven as a woven fabric WC together with the wefts that are inserted into an opening WS formed by a not-shown kite. In addition, when the weft not shown is inserted into the opening WS, the weft is woven into the pre-weaving WF through a not shown fold.

  The warp beam WB is rotationally driven in the delivery direction by the delivery motor M. That is, a warp beam gear G1 is attached to the warp beam WB, and an intermediate gear G2 is engaged with the warp beam gear G1. A worm M1 at the shaft end of the feed motor M is meshed with a worm wheel M2 that is integral with or coaxial with the intermediate gear G2. The worm M1 and the worm wheel M2 form a worm gear having a check function. The feed motor M is rotationally controlled by a feed control device (not shown) based on, for example, the tension of the warp sheet W detected through a load cell attached to the tension roller TR, that is, the warp tension. On the other hand, a pinion (brake gear) 21 is engaged with the warp beam gear G 1, and the braking means 20 is connected to the shaft of the pinion 21. That is, the braking means 20 can apply a braking force to the warp beam WB by braking the shaft of the pinion 21.

  The adjusting means 10 includes a calculating means 11 for introducing a fixed parameter Pa and a fluctuation parameter Pb from the outside. The output of the calculation means 11 is connected to the output means 12 via the changeover switch SW, and the output of the output means 12 is guided to the braking means 20 as the operation amount Q for adjusting the braking force. A setting device 13 is connected to one switching terminal of the changeover switch SW, and a display device 14 is connected to the input side of the output means 12.

  The contents of the fixed parameter Pa and the fluctuation parameter Pb are various parameters as described above, and affect the vibration characteristics of the warp beam WB. Therefore, the calculation means 11 calculates and outputs the calculated value Qa of the operation amount Q in order to adjust the braking force of the braking means 20 based on at least one of these parameters during weaving of the loom. Can do. Therefore, by switching the changeover switch SW to the calculation means 11 side, the output means 12 outputs the operation amount Q corresponding to the calculated value Qa to the braking means 20, so that the braking means 20 is appropriate for the warp beam WB. It is possible to apply a sufficient braking force and suppress the vibration of the warp beam WB.

  When the changeover switch SW is switched to the setter 13 side, the output means 12 replaces the calculated value Qa from the computing means 11 with the operation amount Q corresponding to the set value Qb set in the setter 13 as the braking means 20. Output to. That is, the braking force of the braking means 20 can be manually set via the setting device 13, and the display device 14 switches the changeover switch SW to calculate the calculated value Qa and the setting value Qb. One of these can be selectively displayed.

  An example of the calculation contents by the calculation means 11 will be described with reference to FIG.

  In FIG. 3, “cycle number” is the number of cycles of the loom measured for each rotation of the main shaft of the loom (not shown). The “target loom rotational speed”, “opening pattern”, “weft density”, and “weft type” are variable parameters Pb designated by the weft insertion control device (not shown) for each cycle of the loom. Here, it is assumed that the same weaving pattern is repeated with the maximum number of cycles 600, that is, repeat 600 cycles.

  Therefore, the calculating means 11 stores the braking force Bi (i = 1, 2,...) To be applied to the warp beam WB by the braking means 20 in accordance with the combination pattern of the variation parameter Pb as a table. Therefore, the calculation means 11 can output the braking force Bi corresponding to the variation parameter Pb as the calculated value Qa for each cycle according to the information on the number of cycles from the weft insertion control device. However, in FIG. 3, at least one of the illustrated parameters may be used as the fluctuation parameter Pb, and the number of cycles for switching the fluctuation parameter Pb and the braking force Bi and the repeat can be arbitrarily changed and set.

  The calculating means 11 may store the braking force Bi as a table according to the combination pattern of the fixed parameter Pa and the fluctuation parameter Pb (FIG. 4). That is, the “aperture” and “cutter length” in FIG. 4 belong to the fixed parameter Pa, and the “loom speed” and “weft density” belong to the variation parameter Pb that can be changed during weaving. When the fixed parameter Pa and the fluctuation parameter Pb deviate from the combination pattern of FIG. 4, the braking force Bi is set according to the direction of the influence of each parameter on the braking force Bi (indicated by the signs of + and-in the figure). It can be corrected appropriately. However, the magnitude of the influence of each parameter on the braking force Bi is stored separately for each parameter. Therefore, all or a part of each variation parameter Pb in FIGS. 3 and 4 may be replaced with an actual measurement value detected via a sensor. In addition, one or any two or more of the parameters in FIGS. 3 and 4 can be used.

  As weaving progresses, the warp sheet W on the warp beam WB has a reduced winding diameter and a reduced weight, but these physical quantities directly affect the vibration characteristics of the warp beam WB. Therefore, the calculation means 11 can naturally reflect the actual measurement value of the physical quantity related to the amount of the warp sheet W on the warp beam WB as the fluctuation parameter Pb in the calculated value Qa of the braking force Bi.

  The winding diameter D of the warp sheet W on the warp beam WB can be detected by, for example, the contactless distance sensor 1 that faces the surface of the warp beam WB (FIG. 5A). Further, the winding diameter D may be determined by causing the tip of the swing arm 2a to contact the surface of the warp beam WB (FIG. 5B) and detecting the swing angle of the swing arm 2a by the angle sensor 2. Further, the winding diameter D is such that the tip of the swing arm 3a is brought into contact with the warp sheet W on the way from the warp beam WB to the tension roller TR (FIG. 3C), and the tilt angle of the swing arm 3a is set to the rod 3b. In addition to being converted to a movement distance, the movement distance of the rod 3b can be measured and detected via a deviation sensor 3 such as a linear scale. In FIG. 5C, the tip of the swing arm 3a is brought into contact with the warp sheet W via a weight 3d on a short auxiliary arm 3c integral with the swing arm 3a.

  The winding diameter D of the warp sheet W on the warp beam WB may be detected as its weight, or may be detected as the position and length of the warp path corresponding to the winding diameter D as shown in FIG. Good. Further, it may be detected as a contact angle of the warp sheet W with respect to the guide roll including the tension roller TR, or may be detected as a rotational speed in the sending direction of the warp beam WB. This is because each of these physical quantities is uniquely associated with the amount of the warp sheet W on the warp beam WB.

  Further, the calculation means 11 can employ an actual measurement value of the vibration of the warp beam WB detected through a sensor (not shown) as the fluctuation parameter Pb.

  In the above description, the calculating means 11 may store correction values obtained empirically for each parameter, and calculate the optimum braking force Bi by multiplying the correction values for each parameter.

  Alternatively, the calculated braking force Bi may be displayed on the display unit 14, and the operator may manually adjust the braking force of the braking means 20 with reference to the displayed braking force Bi. In this case, as a manual setting method, based on the braking force of the braking means 20, the braking force is changed by a setting device, or an element related to the braking force (for example, a braking spring such as a disc brake) is adjusted with a tool, Alternatively, there is a method of electrically adjusting an element related to the braking force by operating a setting device or the like.

Other embodiments

  The warp beam vibration suppression device in the loom can be mechanically configured (FIGS. 6 and 7). However, FIG. 7B is a view corresponding to the arrow X in FIG.

  A worm M1 for rotating the warp beam WB in the delivery direction is connected to the delivery motor M via auxiliary gears 41a and 41b. The auxiliary gear 41b and the auxiliary gear 41c on the common shaft of the worm M1 are connected to the input shaft of the torque limiter 42 via other auxiliary gears 41d and 41e. An eccentric cam 43 is connected to the output shaft of the torque limiter 42 via auxiliary gears 42a and 42b. However, the torque limiter 42 is an eddy current torque limiter, for example, and can generate an output torque proportional to the rotational speed of the input shaft on the output shaft.

  The eccentric cam 43 is a disc cam which mounts the roller 43a by a bearing on the outer periphery. An adjusting bolt 44a at the tip of the swing arm 44 is in contact with the eccentric cam 43, and the base portion of the swing arm 44 is swingably supported via a support pin 44c on the bracket 44b. Further, the intermediate portion of the swing arm 44 is urged so that the adjustment bolt 44 a abuts against the outer periphery of the eccentric cam 43 via the compression spring 45 on the stud 45 a.

  The swing arm 44 branches left and right between the compression spring 45 and the support pin 44c, and the pinion 21 and the shaft 23 for the brake 22 as the braking means 20 pass through freely. However, the pinion 21 meshes with the warp beam gear G1 of the warp beam WB, and the shaft 23 is rotatably supported through a bearing 23a containing a bearing.

  The brake 22 is arranged on both sides of a central fixed plate that can rotate relative to the shaft 23, and a rotating plate that is not rotatable relative to the shaft 23 and is movable in the axial direction of the shaft 23 via a spline. This is a general multi-plate brake constructed by mounting a lid plate similar to the rotating plate on both ends, and a brake shoe is interposed between the fixed plate, the rotating plate, and the lid plate. The cover plate on the bearing 23a side is positioned by the inner ring of the bearing of the bearing 23a, and the other cover plate is urged to the bearing 23a side via a compression spring 24 attached to the tip of the shaft 23. Yes. Further, the swing arm 44 is provided with left and right rollers 44d and 44d. The swing arm 44 and the shaft 23 come together with the rollers 44d and 44d landing on the surface of the cover plate on the compression spring 24 side. Even if the brake 22 rotates, a predetermined contact pressure can be applied to the brake 22 to exert a braking force.

  The torque limiter 42 is attached to the loom frame 46 together with the bracket 44b for the swing arm 44. The shaft 23 penetrates the frame 46 inward and outward via a bearing 23 a, and a stud 45 a for the compression spring 45 is erected on the frame 46.

  If the amount of the warp sheet W on the warp beam WB is large and the winding diameter D of the warp sheet W is large, the rotational speed of the warp beam WB in the feed direction by the feed motor M is small, and therefore the output torque of the torque limiter 42 Is also small. Therefore, the swing arm 44 at this time has a small swing amount by the eccentric cam 43, and the brake 22 is applied with a large contact pressure by both of the compression springs 45 and 24, and warp via the pinion 21 and the warp beam gear G1. A large braking force can be applied to the beam WB. When weaving progresses and the winding diameter D of the warp sheet W on the warp beam WB decreases, the rotational speed of the warp beam WB increases and the output torque of the torque limiter 42 increases. Therefore, the eccentric cam 43 rotates and swings the swing arm 44 against the compression spring 45 (in the direction of arrow K4 in FIG. 7A), so that the braking force of the brake 22 against the warp beam WB is reduced. Can do.

  6 and 7 can adjust the braking force of the brake 22 applied to the warp beam WB based on the winding diameter D of the warp sheet W on the warp beam WB. The compression force of the compression springs 45 and 24 can be arbitrarily adjusted and set. 6 and 7, the warp beam WB may be driven via a transmission by a main shaft (not shown) instead of the delivery motor M, and the rotation of the output shaft of the transmission is input to the torque limiter 42. Input to the axis.

  6 and 7, the rotation speed of the warp beam WB is an actual measurement value of a physical quantity related to the winding diameter D of the warp sheet W on the warp beam WB, that is, the amount of the warp sheet W on the warp beam WB. Therefore, the swing arm 44 of FIG. 7 can be interlocked with the movement of the swing arm 2a of FIG. 5B, the swing arm 3a of FIG. 5C, or the rod 3b (FIG. 8).

  In FIG. 8A, a rod 47 is connected to the tip of the swing arm 44 via a compression spring 47a. When the amount of the warp sheet W on the warp beam WB decreases, the rod 47 swings the swing arm 44 via the compression spring 47a (in the direction of the arrow in FIG. 8A), thereby reducing the braking force of the brake 22. Let In FIG. 8B, the rod 48 connected to the tip of the swing arm 44 via the tension spring 48a has moved sufficiently to the left in the figure when the amount of the warp sheet W on the warp beam WB is large. The braking force of the brake 22 is increased through the tension spring 48 a and the swing arm 44. When the amount of the warp sheet W decreases, the rod 48 moves to the right side and decreases the braking force of the brake 22 (in the direction of the arrow in FIG. 8B).

  The braking force of the brake 22 may be adjusted by another electric or mechanical actuator attached to the brake 22 instead of being adjusted by the swing of the swing arm 44. The brake 22 may be of a type other than the multi-plate brake as long as the braking force can be adjusted, and the braking force may be manually adjusted based on the amount of the warp sheet W on the warp beam WB.

Overall configuration block diagram Schematic diagram of the main components of the loom Operation explanation chart (1) Operation explanation chart (2) Main part composition explanatory view showing other embodiments (1) Main part block diagram which shows other embodiment Main part composition explanatory view showing other embodiments (2) Main part composition explanatory view showing other embodiments (3)

Explanation of symbols

W ... Warp yarn sheet WB ... Warp beam Bi (i = 1, 2, ...) ... Braking force Pa ... Fixed parameter Pb ... Fluctuating parameter 10 ... Adjusting means 20 ... Braking means

Patent Applicant Tsudakoma Industry Co., Ltd.
Attorney Tadaaki Matsuda, Attorney

Claims (5)

  Based on at least one of the parameters affecting the vibration characteristics of the warp beam, the braking force applied to the warp beam is adjusted by a braking means different from the warp beam driving device to suppress the vibration of the warp beam during weaving. A method for suppressing warp beam vibration in a loom.   2. The warp beam vibration suppression method for a loom according to claim 1, wherein the parameter includes at least one of a fixed parameter that does not change during weaving and a fluctuation parameter that can change during weaving.   3. The variation parameter includes at least one of an actual measurement value of a physical quantity related to the amount of warp sheets on the warp beam, an actual measurement value of warp beam vibration, and an actual measurement value of physical quantity related to warp beam vibration. A method for suppressing warp beam vibration in the loom described.   Adjusting means and braking means separate from the warp beam driving device, the adjusting means controlling the warp beam by the braking means based on at least one of the parameters affecting the vibration characteristics of the warp beam. A warp beam vibration suppressing device for a loom characterized by adjusting power to suppress vibration of a warp beam during weaving. 5. The warp beam vibration suppressing device according to claim 4, wherein the adjusting means adjusts a braking force of the braking means based on a measured value of a physical quantity related to the amount of warp sheets on the warp beam.

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