JP4942011B2 - How to prevent weft density unevenness in looms - Google Patents

Description

The present invention relates to a weaving machine that switches weaving conditions during weaving operation, and a method of preventing weft density unevenness of a weaving machine that corrects a speed command signal of a warp traveling member from a time before the switching time when switching the weaving conditions. About.

If the weaving conditions change during weaving, the warp binding force with respect to the wefts also changes, so that weft density unevenness occurs in the woven fabric corresponding to the change in the weaving conditions. The technologies of Patent Literature 1 and Patent Literature 2 below are technologies for preventing uneven weft density in a woven fabric in response to changes in weaving conditions.

That is, in Patent Document 1, a plurality of weft densities are set in advance as weaving conditions, and the take-up roller or the delivery beam is driven to rotate at a command speed corresponding to the switching of the weft density during the weaving operation of the loom. However, a technique is disclosed in which the command speed is corrected in accordance with a change in the movement amount of the pre-weaving position accompanying the change in the weft density when the weft density is changed.

Further, Patent Document 2 is a loom that changes the fabric structure in response to the update of the weft insertion pick number. At the time of switching the fabric structure, the change in the pre-weaving position due to the change in the warp tension due to the change in the fabric structure. A technique for temporarily changing the rotational speed of the winding motor to cancel the action is disclosed.
JP-A-2-182945 JP-A-2-259141

Each of the techniques of Patent Document 1 and Patent Document 2 is only a technique for correcting the speed command signal after switching of the weaving conditions, and nothing is mentioned about the correction from before switching. However, when the speed correction is started after the weaving condition is changed, such a control is performed because the warp and the change in the fabric tension accompanying the speed correction are beaten and woven before appearing as a change in the position before weaving. However, it is not sufficient from the viewpoint of the effect of preventing the weft density unevenness. In addition, since the woven fabric is inherently elastic, a certain amount of time is required from when the clothing roll is driven to when the driving effect of the clothing roll is reflected at the actual weaving (weave) position. Is also a factor. Similarly, the warp yarn has greater elasticity than the woven fabric, and the warp system path length to the pre-weaving position is also large, so that the driving effect of the warp beam is the same as the actual weaving (weave). One reason is that it takes time to be reflected in the position.

Accordingly, an object of the present invention is to make the weft density unevenness (weaving step) generated with the switching of the weaving conditions less noticeable in the loom that switches the weaving conditions during the weaving operation of the loom.

Based on the above-mentioned problems and purposes, the present invention comprises a warp control device that controls the travel of warp yarns by driving a winding roll / warp beam as a warp travel member in accordance with a speed command generated during the weaving operation. In the weaving machine that switches the weaving conditions in accordance with the update of the weft insertion pick number during the weaving operation, the warp control device has a correction amount for the speed command to switch the weaving conditions. The warp control device sets the warp running time at a correction start time set before the switching time of the weaving conditions when the weaving conditions are switched during the weaving operation. correction from the correction start timing which is determined as the effect of driving is reflected in the position before (9) woven into Setsu換Ri time of weaving conditions in accordance with the member, the steel according to the correction amount So that temporarily corrected in a direction to eliminate the weft density unevenness due to Setsu換Ri condition (claim 1).

The correction start timing of the speed command for the warp running member (cloth winding roll / warp beam) is preferably after ten or more picks before the start of the switching of the weaving conditions (Claim 2). Further, the end point of the speed command correction period for the warp running member (cloth winding roll / warp beam) may be any before, at the same time as, or after the switching of the weaving conditions.

The weaving conditions include one or more of weft yarn types (more specifically, thickness and material), weft density, fabric structure (warp opening pattern), and loom (main shaft) rotational speed. ). The warp control device includes at least one of a winding control unit that drives a clothing roll and a delivery control unit that drives a warp beam.

According to the present invention, even when there is a time delay until the temporary driving for the winding roll or the warp beam acts before weaving, the warp control device is preliminarily used when switching the weaving conditions during the weaving operation. Since the correction of the speed command corresponding to the switching of the weaving conditions is started from the correction start time determined before the switching time of the weaving conditions according to the set correction amount, the weft density unevenness with a margin in time. Prevention control can be executed. In particular, when the weaving conditions are switched, the intended effect functions effectively because the effect of driving the warp traveling member is reflected in the actual pre-weaving (weaving opening) position. Due to this effect, weaving conditions can be switched to make the weft density unevenness that is likely to occur more inconspicuous, and the quality of the fabric is improved (Claim 1).

The speed command correction start timing for the warp running member is preferably after ten or more picks before the start of the switching of the weaving conditions, but this timing can be set according to the type of fabric, that is, the elasticity of the warp or woven fabric. Thereby, it can respond to more kinds of textiles irrespective of the magnitude of elasticity (Claim 2).

More specifically, the weaving conditions include one or more of the weft type (thickness / material), the weft density, the weave structure (warp opening pattern), and the rotational speed of the loom (main shaft). Since the transitional change is remarkable when the rotational speed of the loom (main shaft) is changed, it is useful for switching the weaving conditions including the change of the rotational speed of the loom (main shaft).

The warp control device includes at least one of a winding control unit that drives the clothing roll and a sending control unit that drives the warp beam, but particularly when the winding control unit and the sending control unit act simultaneously, Weft density unevenness that easily occurs due to switching can be more reliably prevented (Claim 4).

[Outline of loom]
FIG. 1 shows a main part of the loom 1, particularly the entire warp system. In FIG. 1, a large number of warp yarns 2 are fed out as a sheet form from a warp beam 3, passed through a plurality of reeds 5 and 6 through a back roll 4, and formed into an opening 9 of a woven fabric 8 while forming an opening 7. Has reached.

On the other hand, the weft 10 is weft-inserted into the openings 7 of the upper and lower warps 2 and then beaten on the pre-weave 9 by the beating motion of the reed 6 to form a structure of the woven fabric 8. The woven fabric 8 is wound around the fabric winding roll 15 through the guide roll 11, the press roll 12, the clothing roll 13 and the press roll 14.

The opening movement of the reed 5 and the striking movement of the reed 6 are interlocked with the rotation of the main shaft 17 of the loom 1. The main shaft 17 is driven by a main shaft motor 16. The rotation of the main shaft 17 is converted into a reciprocating motion (opening motion) of each reed frame by an electronic dobby type opening device 18 and transmitted to each reed 5, and converted to a reciprocating motion by a striking motion conversion device 19. , Is transmitted to 筬 6.

The warp beam 3 and the clothing winding roll 13 are driven by a delivery motor 20 and a winding motor 21, respectively. The feeding motor 20 and the winding motor 21 are controlled by a feeding control unit 23 and a winding control unit 24 inside the warp control device 22, respectively. The warp beam 3 and the clothing roll 13 are both or only rotated to move the warp 2, the woven fabric 8, and the pre-weave 9 back and forth, thus constituting the warp traveling member referred to in the present invention. .

If the clothes winding roll 13 as a warp running member rotates further in the winding direction during the original winding control process, for example, when the rotational speed of the main shaft 17 is switched, the warp yarn 2 and the woven fabric 8 are wound together. Since it moves in the picking direction (forward), the fabric 9 also moves in the same direction. Further, if the warp beam 3 as the warp running member rotates further in the feeding direction when the weaving condition is switched in the process of feeding control, the warp 2 and the woven fabric 8 are both wound in the winding direction (forward) by their tension. ), The woven fabric 9 also moves in the same direction as described above.

Next, FIG. 2 shows a weft insertion system of a two-color fluid jet loom as an example of the loom 1. In FIG. 2, two wefts 10 are pulled out from the respective yarn feeders 26 supported by the respective weft holders 25 and guided to the rotating yarn guide 28 of the weft length measuring and storing device 27 of the drum weft winding method. While being locked by the locking pin 30 on the thread winding surface on the outer periphery of the drum 29 in the state, the thread 29 is wound around the thread winding surface of the drum 29 by the rotational movement of the rotating thread guide 28, and is measured until the weft insertion. Reserved. The rotating yarn guide 28 is driven by a drive motor 31.

For the weft insertion operation at the time of weft insertion, the locking pin 30 is driven by the actuator 32, retracts from the thread winding surface of the drum 29, and advances again to the thread winding surface, so that the thread winding surface of the drum 29 is reached. The wound weft 10 is unwound by a length necessary for one weft insertion on the drum 29 and guided to the main nozzle 33 for weft insertion.

The main nozzle 33 is necessary for one weft insertion by injecting the pressure air 35 together with the weft 10 into the opening 7 of the warp 2 during the injection period from the start of injection to the end of injection for the weft insertion operation. A weft 10 having a length is inserted into the opening 7. As a result, the weft 10 flies along the flying path in the opening 7 and is inserted into the opening 7.

The pressurized air 35 is supplied from the pressurized air source 34 to the main nozzle 33 through the air supply line 36, the pressure adjusting valve 37, and the electromagnetic opening / closing valve 38 during the injection period for weft insertion. The pressure regulating valve 37 is provided to set the supply pressure of the pressurized air 35 to the main nozzle 33 to a predetermined pressure value.

During the weft 10 travel process, one or more groups of sub-nozzles 39 are opened by relaying the pressure air 35 in harmony with the weft 10 travel in the direction of the weft 10 travel. 7, the weft yarn 10 that is flying is urged in the weft insertion direction. The pressure air 35 of the sub nozzle 39 is supplied from the pressure air source 34 to the sub nozzles 39 of each group through the pressure adjustment valve 40, the air supply pipe 41, and the electromagnetic opening / closing valve 42. The pressure regulating valve 40 sets the pressure air 35 for the sub nozzle 39 to a predetermined pressure value.

The weft thread 10 that has been normally weft-inserted by the jet operation of the main nozzle 33 and the plurality of sub-nozzles 39 is beaten on the pre-weaving 9 by the reed 6 and woven into the woven cloth 8, and then supplied on the weft insertion side It is cut by the cutter 43. Thereby, the weft 10 woven into the woven fabric 8 is separated from the weft 10 in the main nozzle 33.

When the weft insertion is completed, the success or failure of the weft insertion is detected by the weft feeler 44 directed to the flying path of the weft 10 (the ridge of the deformed kite). The weft feeler 44 opposes the flight path of the weft yarn 10 in the vicinity of the weft end portion on the weft arrival side, and is provided at a position where the weft yarn 10 that has been normally inserted can reach. The arrival of the weft 4 inside is detected. When the arrival of the weft 4 is detected, the weft insertion is normal, and when the arrival of the weft 4 is not detected, the weft insertion is defective. The weft feeler 44 determines whether weft insertion is normal or defective, outputs a weft stop signal when the weft insertion is defective, and sends this to the main controller 45.

The drive motor 31 of the weft length measuring and storing device 27, the actuator 32 of the weft length measuring and storing device 27, the electromagnetic on / off valve 38 corresponding to the main nozzle 33, the electromagnetic on / off valve 42 corresponding to the sub nozzle 39, and the pressure adjusting valves 37 and 40, Both are controlled by the weft insertion control unit 46. Various setting data for the main control unit 45 and the weft insertion control unit 46 are input by the setting unit 47 as a weaving condition before weaving. The angle detector 48 connected to the main shaft 17 of the loom 1 generates a signal of the rotation angle θ of the main shaft 17 and sends it to the main control unit 45, the weft insertion control unit 46, and the like.

[Outline of control system]
FIG. 3 shows a setting device 47, a main control unit 45, a selection signal (switching signal) generation unit 49, a main drive unit 50, and a weft insertion control related to the warp control device 22 (the feeding control unit 23 and the winding control unit 24). The connection example of the part 46 etc. is shown.

In FIG. 3, an angle detector 48 is connected to the main shaft 17 of the loom 1, and a signal of the rotation angle θ output from the angle detector 48 is sent to the feed controller 23, warp control in the warp control device 22. Since the winding control unit 24, the main control unit 45, the weft insertion control unit 46, the selection signal (switching signal) generation unit 49, and the main drive unit 50 inside the apparatus 22 are input, these are signals of the rotation angle θ. That is, it operates in synchronization with the main movement of the loom 1.

The main control unit 45 operates / stops / inactivates from a plurality of loom operation buttons 55 in addition to setting value data and signals from the setting unit 47 and a weft stop signal from the weft feeler 44 when the weft insertion is defective. An instruction such as reverse rotation is input to generate a loom operation signal and the like, which are sent to the main drive unit 50, the weft insertion control unit 46, and the warp control device 22 (the sending control unit 23 and the winding control unit 24), The operation according to each signal and instruction is controlled. The main control unit 45 and the inverter 54 control the rotation of the spindle motor 16 according to an instruction such as inching / reverse rotation in addition to the operation of the loom 1.

The selection signal (switching signal) generation unit 49 receives the set value data and signals input from the setting unit 47 and the rotation angle θ signal output from the angle detector 48, and receives a speed switching signal and an aperture frame selection signal. , A weft selection signal, a driving density selection signal and a correction operation selection signal are generated, a speed switching signal is input to the main drive unit 50, an opening frame selection signal is input to the opening drive unit 51 of the opening device 18, and a weft selection signal is input Each is sent to the control unit 46, and a driving density selection signal and a correction operation selection signal are sent to the sending control unit 23 and the winding control unit 24.

The weft insertion control unit 46 receives the weft selection signal from the selection signal (switching signal) generation unit 49, and when the rotation angle θ set in advance according to the yarn type of the weft 10 is reached, the electromagnetic on-off valve 38 , 42, the actuator 32 of the locking pin 30 and the pressure regulating valves 37, 40 are operated. The opening drive unit 51 of the opening device 18 receives the opening frame selection signal from the selection signal (switching signal) generation unit 49, selects the opening frame (綜 絖 5) suitable for the weaving structure, and performs a predetermined opening motion on it. give. Further, when the main drive unit 50 receives the speed switching signal from the selection signal (switching signal) generation unit 49, the main driving unit 50 switches the current rotational speed to the newly designated rotational speed, thereby the yarn type of the weft 10 The spindle motor 16 is driven at a rotational speed suitable for the weave structure.

Further, the sending control unit 23 receives the driving density selection signal and the correction operation selection signal from the selection signal (switching signal) generating unit 49, and the driving unit 52 rotates the rotational speed corresponding to the driving density of the weft yarn 10, that is, described later. The warp yarn 2 is fed out by driving the feeding motor 20 based on the base speed. The winding control unit 24 also receives the driving density selection signal and the correction operation selection signal from the selection signal (switching signal) generation unit 49, and the driving unit 53 rotates the rotational speed corresponding to the driving density of the weft yarn 10. Then, the woven fabric 8 is wound up by driving the winding motor 21. The correction operation selection signal is output when it is necessary to correct the rotational speed of the sending motor 20 and the winding motor 21 when the rotational speed of the main shaft 17 is switched.

FIG. 4 shows a specific example of the winding control unit 24 and the driving unit 53. The winding control unit 24 includes a base speed generation unit 56, a correction signal generation unit 57, and a pulse generation unit 58. The base speed generator 56 receives a plurality of driving density data as set values from the setting unit 47, and the driving density selection signal from the selection signal (switching signal) generator 49 is the yarn of the weft 10. One driving density is selected from a plurality of driving density data according to the type and texture. The base speed generator 56 generates a base speed signal corresponding to the selected driving density and sends it to the pulse generator 58.

On the other hand, the correction signal generator 57 receives a plurality of correction start times, correction ratios as correction amounts, and correction period data as set values from the setting unit 47, and stores them in correspondence with the selection signals. (Switching signal) The correction operation selection signal as the output of the generation unit 49 selects an appropriate correction ratio (correction rate) and speed correction period when the winding speed correction is necessary in accordance with the switching of the rotational speed of the spindle 17. Then, a correction rate signal is sent to the pulse generator 58.

The pulse generator 58 generates a drive amount (pulse number) signal corresponding to the speed command over the speed correction period based on the base speed and the correction factor, and outputs the drive amount (pulse number) signal to the drive unit. 53. Therefore, the drive unit 53 drives the winding motor 21 at a predetermined rotational speed (winding speed) based on the signal of the driving amount (number of pulses) over the speed correction period. Here, the winding rotational speed of the winding motor 21 is expressed as follows: winding rotational speed = base speed × {1+ (correction rate / 100)} × coefficient using a base speed, a correction factor, and a coefficient. .

The drive unit 53 includes a forward / reverse counter 59, a current generator 60, and a pulse generator 61. The forward / reverse counter 59 outputs a signal corresponding to the input number of pulses, that is, a speed command, to the current generator 60, and rotates the winding motor 21 at the rotation speed of the winding. The rotation of the winding motor 21 is detected by the pulse generator 61 and sent back to the forward / reverse counter 59 as a subtraction signal.

FIG. 5 shows a specific example of the sending control unit 23 and the driving unit 52. The delivery control unit 23 includes a base speed generation unit 62, a tension control unit 63, a correction signal generation unit 64, and a pulse generation unit 65. The base speed generator 62 receives a plurality of driving density data as set values from the setting device 47, and the driving density selection signal from the selection signal (switching signal) generator 49 is the yarn of the weft yarn 10. One driving density is selected from a plurality of driving density data according to the seed and weaving structure. The base speed generator 62 generates a base speed signal corresponding to the selected driving density and sends it to the pulse generator 65.

Further, the tension controller 63 receives the target tension data set as the set value by the setting unit 47, compares the target tension value with the actual tension value detected by the tension sensor 66, and compares them. A tension control signal corresponding to the difference (tension deviation) is generated and sent to the pulse generator 65. When there is no tension deviation, the tension control signal is a zero level signal. However, when there is a tension deviation, the tension control signal is a signal corresponding to the tension deviation.

When the correction operation selection signal is input to the tension control unit 63, the output (tension control signal) of the tension control unit 63 is invalid. Incidentally, the tension sensor 66 is incorporated in the support position of the back roll 4 in FIG. 1, for example, and detects the tension value of the warp 2 from the resultant force of all the warps 2 acting thereon.

On the other hand, the correction signal generator 64 receives data of a plurality of correction ratios and a plurality of speed correction periods as set values from the setting device 47, and a correction operation as an output of the selection signal (switching signal) generator 49. The selection signal selects an appropriate correction ratio (correction rate) and speed correction period when correction is necessary, and sends a correction rate signal to the pulse generator 65 as the rotational speed of the main shaft 17 changes.

In addition to the base speed from the base speed generation unit 62, the tension control signal from the tension control unit 63, and the correction rate signal from the correction signal generation unit 64, the pulse generation unit 65 receives a winding diameter signal from the winding diameter sensor 67. Based on the above, a drive amount (pulse number) signal corresponding to the speed command is generated, and the drive amount (pulse number) signal is sent to the drive unit 52. As shown in FIG. 1, the winding diameter sensor 67 is disposed near the warp beam 3, detects the winding diameter of the warp 2, and sends the signal to the pulse generator 65. In addition, it is also possible to use a publicly known method for detecting the winding diameter of the warp beam 3 indirectly based on the rotation amount signal from the pulse generator 70, instead of directly detecting using the sensor 67. .

Therefore, the drive unit 52 receives the drive amount (pulse number) signal as a speed command output from the pulse generation unit 65 as an input, and sends out the drive amount (pulse number) signal over a predetermined speed correction period. The motor 20 is driven. Here, the sending rotation speed of the sending motor 20 is determined by using the base speed, the correction rate, the tension deviation, the coefficient, and the winding diameter, and the sending rotation speed = [base speed × {1+ (correction rate / 100) + (tension Deviation / 100)} × coefficient] / winding diameter.

The drive unit 52 includes a forward / reverse counter 68, a current generator 69, and a pulse generator 70. The forward / reverse counter 68 outputs a signal corresponding to the input pulse number, that is, a speed command to the current generator 69, and rotates the delivery motor 20 at the delivery rotational speed. The rotation of the sending motor 20 is detected by the pulse generator 70 and sent back to the forward / reverse counter 68 as a subtraction signal.

[Example of input screen]
FIGS. 6 to 10 show examples of input screens when the setting device 47 is constituted by a touch panel type input display. More specifically, as one of the weaving conditions, the loom operating speed (the loom main shaft rotation speed) is shown. ) Is assumed to be a weaving machine that switches from one speed to the other, and an example is shown in which setting data relating to rotation speed switching as weaving conditions and density unevenness prevention for the embodiments described later are input.

First, FIG. 6 is an input screen for “selection signal setting (opening setting / weft density / weft selection / textile structure / rotation speed)”. For the weft picks on the left side from n-5 to n + 6 on the screen, a data setting column regarding the opening mode of each opening frame in the opening driving unit 51 (electronic dobby) and output of various selection signals used when controlling the loom There is a signal data setting field relating to the mode. Note that the opening frame is the frame of the eaves 5, that is, the eaves frame as described above.

More specifically, as described at the bottom of the screen of FIG. 6, in the opening frame data setting column, the opening frame NO. Of which about 2 frames are allocated to the ear tissue and the remaining frames are allocated to the ground tissue (warp). Further, as described at the bottom of the screen, in the signal data setting column, NO. 1-3 weft selection signal (3 bit, 8 colors), NO. 4-6 weft density selection signal (corresponding to 3 bits and 8 densities), NO. 7-8 rotation speed selection signal (corresponding to 2bit / 4 setting), NO. 9-10 woven fabric type selection signal (corresponding to 2 bits and 4 types), NO. 11-13 correction operation selection signals (corresponding to 3 bits and 8 settings) are assigned. Various keys necessary for editing are displayed in an operable manner on the screen of the touch panel displayed in this way. NO. 7-8, NO. 11 to 13 are used in Example 1 described later, and NO. 1-3, NO. 4-6, NO. 9 to 10 are used in Example 2 described later.

Next, FIGS. 7 and 8 show setting input screens related to “rotational speed setting” (switching of the rotational speed) of the spindle 17. On the left side of the screen in FIG. 7, there are input fields for change start pick number, rotation speed change period, rotation speed before change, and rotation speed after change for each speed switching process 1 and 2, touch the input fields. When an input item is designated, a numeric keypad is displayed on the right side of the screen, and a numeric value can be entered in the designated input field by operating the numeric keypad. FIG. 8 shows a screen after input related to “rotational speed setting” (switching of rotational speed). Various keys necessary for editing and stepping are arranged on the screen. When the key for the density unevenness prevention setting screen is touched on the rotation speed setting (rotation speed switching) screen of FIG. 8, the screen is switched to the screen of FIG.

FIG. 9 shows a screen of “density unevenness prevention setting / winding speed switching”. In this screen, for each setting 1 (speed switching step 1) and setting 2 (speed switching step 2), the pick number and the spindle crank angle as the change start point, the pick number and the spindle crank angle as the change end point, and the change start point The speed ratio and the speed ratio at the end of change can be specified in the corresponding input fields. The main shaft crank angle is the rotation angle θ of the main shaft 17.

Although not shown here, in the same way as in FIG. 7, when inputting a numerical value in each column, if an input item is specified by touching each input column, a numeric keypad is displayed on the right side of the screen. Numeric values can be entered in the fields. FIG. 9 shows the screen after the numerical values are entered for each column. Various keys necessary for editing and step progress are arranged on the screen, and when a key to the density unevenness prevention confirmation screen on the screen is touched, the screen is switched to the screen of FIG.

In the screen of FIG. 9, when the key to the density unevenness prevention confirmation screen is touched, the setting device 47 automatically determines the selection signal and the speed correction pattern by a built-in algorithm, and uses the data set in the input process as the main. This is sent to the control unit 45, the selection signal generation unit 49, the main drive unit 50, the weft insertion control unit 46, the sending control unit 23 of the warp control device 22, and the winding control unit 24.

FIG. 10 shows a “density unevenness prevention confirmation screen”. The numerical data set in the input process from FIG. 7 to FIG. 9 is graphically displayed as a graph of the rotational speed of the main shaft 17 (main shaft rotational speed) and the winding speed on the axis of the pick number. The operator can confirm the speed pattern of the spindle 17 and the pattern of the winding speed from the diagram automatically generated from the setting data. The winding speed here is a speed that is finally output as a result of speed correction with respect to the base speed.

According to this example, the spindle rotational speed decreases from the main spindle rotational speed from 900 rpm to 200 rpm with a predetermined reduction rate in 100 to 101 picks according to the speed switching step 1, whereas the winding speed is from 99 picks according to setting 1. Between 100, a predetermined pattern so that the output is 80% of the base speed (reference) as a reference, that is, a base that is low to about 44% of the base speed at 99 picks immediately before 101 picks. The speed is set so that it is output again at the base speed as a reference after 101 picks. The winding speed pattern will be described in detail with reference to FIGS. When the confirmation end key is touched on this screen, the data set in the input process is confirmed. Further, if necessary, touching the corresponding operation key for returning to the setting process returns to the density unevenness prevention setting screen or the setting speed setting screen of the loom spindle.

[Method of preventing weft density unevenness of loom according to the present invention]
The method for preventing the weft density unevenness of the loom according to the present invention is based on the loom 1 including the warp control device 22. The loom 1 switches the weaving conditions according to the update of the weft insertion pick number during the weaving operation based on a plurality of preset weaving conditions. In the following examples, the weaving conditions The operating speed (rotational speed of the main shaft) of the loom, which is one of the above, is switched. Further, the warp control device 22 controls the travel of the warp 2 by driving the warp travel members (the warp beam 3 and the winding roll 13) according to the speed command generated during the weaving operation.

In the following embodiments, the warp control device 22 is preset with correction parameters including a speed correction period and a correction amount with respect to the speed command in response to the switching of the weaving conditions. When switching the rotational speed of the weaving machine spindle, which is the weaving condition during operation, the weft density associated with the switching of the weaving condition according to the correction parameter from the correction start time determined before the switching time of the weaving condition The speed command is corrected in a direction to eliminate unevenness. The warp control device 22 includes at least one of a winding control unit 24 that drives the clothing winding roll 13 and a delivery control unit 23 that drives the warp beam 3.

During the weaving operation of the loom 1, when the correction start time is reached, the warp control device 22 follows the set correction parameter in the direction to eliminate the weft density unevenness caused by the switching of the rotational speed of the main shaft 17. Correct the speed command. The correction parameter related to the correction start timing and the correction amount of the speed command is set corresponding to at least one of the difference between the two set rotational speeds and the direction of change of the rotational speed.

FIG. 11 is a specific explanatory view of the operation mode of the winding motor 21 before and after the rotation speed of the main shaft 17 is switched. In FIG. 11, when the weft insertion pick number reaches 100, the spindle speed selection signal changes from r1 to r2. That is, the selection signal (switching signal) generation unit 49 detects the weft insertion pick number from the input count number of the 0 ° (beating point) signal of the rotation angle θ of the main shaft 17 as an input. When 100 is reached, a one-pulse speed switching signal is generated. At this time, the spindle speed selection signal is changed from r1 to r2 and sent to the main drive unit 50.

For this reason, the main drive unit 50 reduces the rotation speed of the main shaft 17 by the predetermined speed change gradient input in the setting process in the speed switching process 1 of the weft insertion pick numbers 100 to 101, and increases the rotation speed. The setting rotational speed (900 rpm) is switched to a lower setting rotational speed (200 rpm). Of course, the high set rotational speed (900 rpm) and the low set rotational speed (200 rpm) are also input in advance through the setting device 47 in the setting process.

On the other hand, the winding motor 21 is speed-off until the weft insertion pick number 98, and is constant at the rotational speed v1 based on the base speed corresponding to the rotational speed of the loom main shaft. In the speed correction period up to 100, the speed correction is on, and based on the speed correction rate set corresponding to the speed correction period for the corresponding base speed, the weft pick number 99 is faster than the rotational speed v1. At the lower rotational speed v3, the weft insertion pick number 100 is further lowered slightly from the speed v3. After that, after the weft insertion pick number 101 after the speed correction period, as described above, the rotational speed of the loom spindle again. When the rotation speed of the main shaft 17 decreases with a gradient substantially equal to the velocity change gradient based on the base velocity, and finally the weft insertion pick number 101 is finished. In the rotation speed v2.

In this way, the speed correction operation of the warp control device 22 associated with the switching of the rotational speed of the loom main shaft is performed by the functions of the selection signal (switching signal) generator 49 and the winding controller 24. Correction rates for correcting these rotational speeds v1 and v2 with respect to the base speed are also input in advance by the setting device 47. As an example, the rotational speed v3 that is the speed command value output during the speed correction period is set to output about 0.8 times the base speed vb by setting the correction factor.

According to the control of the winding speed, the area of the hatched portion in the speed correction period in FIG. That is, the winding amount of the woven fabric 8 should be proportional to the rotation amount of the main shaft 17, but the winding amount of the woven fabric 8 (warp 2) in the speed correction period is larger than the original winding amount. It is reduced by an amount corresponding to the area of hunting. For this reason, the position of the woven fabric 8 before the weaving 9 moves backward on the loom 1, that is, closer to the side of the heel 6 by an amount corresponding to the area of hunting than the position to move originally.

As a result, even if the rotational speed of the main shaft 17 is switched from 900 rpm to a lower set rotational speed of 200 rpm, the amount of bending of the scissors 6 is reduced and the striking force is weakened, Since the position of the weave 9 at each hitting point after the weft insertion pick number 100 with the speed correction approaches the side of the tack 6, the weak punching force is compensated by the position correction of the weave 9. It is ideal that the position correction of the weave 9 completely corresponds to the change in the deflection amount of the heel 6, but even if the state does not completely correspond, an effect commensurate with the position correction amount of the weave 9 can be expected. Thus, the weft density unevenness can be made inconspicuous.

As described above, when the weft picking number reaches 100, in the loom 1 that switches the rotational speed of the main shaft 17 from a high setting rotational speed to a lower setting rotational speed, when the weft picking number is 100 or later. In response to the decreasing striking force, the winding control unit 24 decreases the speed command value based on the base speed in accordance with a correction factor set in advance in the deceleration direction from one pick before the start of switching the rotational speed to a low speed. Thus, the weft density unevenness (thin step) can be made inconspicuous by suppressing the amount of forward movement of the pre-weaving position and moving the position of the pre-weaving 9 toward the heel 6 side.

In the above example, the speed correction operation for the clothing roll or warp beam is performed from the position just before the weft insertion pick number where the rotation speed is switched in consideration of the reduction of the beating force. It takes time to be reflected in the position before weaving due to the elasticity of the fabric and the cloth, or the frictional force of the members such as temples, droppers and healds intervening before weaving. In such a woven fabric type having a large time delay, the speed correction operation of the warp control device may be performed from a position before the one pick. In recent years, looms are being operated at high speed, and according to previous studies, the allowable range of this starting point is after a dozen or more picks before switching.

Therefore, although the correction start time is before the switching time of the weaving conditions, it is usually set after ten or more picks before the start of switching of the weaving conditions. The correction end time is set before or after the weaving conditions are switched. For this reason, the speed correction period (the period from the correction start time to the correction end time) is after a dozen picks before the start of the switching of the weaving conditions and before the switching of the weaving conditions before the switching of the weaving conditions. Will be set. In the above-described embodiments, the rotational speed has been described as an example. However, as other weaving conditions, weft yarn types (more specifically, thickness and material), weft density, woven fabric (more specifically, Is a warp opening pattern for each weft pick. For this reason, the weaving conditions include one or more of the above-described types of weft yarn types (thickness / material), weft density, woven fabric structure (warp opening pattern), and rotational speed of the loom (main shaft).

The following modes can be considered for setting the correction parameter including the correction amount for the speed command. When the operator inputs the correction amount for the pre-weaving position assumed by the operator to the setting device 47, the setting device 47 automatically sets the correction rate for the base speed and the speed correction period (time) by a predetermined algorithm based on the input value. To decide. Alternatively, if necessary, the operator can directly input a correction rate and a speed correction time for the base speed.

In addition, although the example of FIG. 11 has shown the deceleration aspect of the speed command of the winding motor 21, the negative | minus setting (reversal) of a correction factor can also be considered depending on the textile type. In addition, the switching of the rotation speed of the main shaft 17 is not limited to a deceleration example, and an example of an increase in speed can be assumed. In an example in which the rotation speed of the main shaft is increased, the winding motor 21 is temporarily set, for example, as a measure against thick steps. It is also conceivable to set a large correction rate so as to drive at a higher speed.

As described above, the speed correction period (the period from the correction start time to the correction end time) is before the switching time of the weaving conditions, and usually after a dozen picks before the start of the switching of the weaving conditions. The period from the correction start time to the correction end time before or after the switching of the weaving conditions is set as the speed correction period of the circled number 1 in FIG. Until the end of the pick number 98, the speed correction period of the circled number 2 is from the middle of the weft insertion pick number 98 to the middle of the weft insertion pick number 102, and the speed correction period of the circled numeral 3 is the weft insertion pick number 97. To the middle of the weft insertion pick number 100.

In addition to the illustrated speed correction period from the weft insertion pick number 99 to the weft insertion pick number 100, the winding control unit 24 in the warp control device 22 also performs the weft insertion pick number in the speed correction periods of the circled numbers 1 to 3. By detecting the start point of the speed correction period and pre-reading numerical data necessary for the speed correction operation, the speed correction is started prior to the switching of the weaving conditions (spindle rotational speed).

As shown in FIG. 11, the time required for speed correction is given as a sufficient time from before the weaving condition is switched. Therefore, according to the present invention, when switching the weaving conditions during weaving operation, the speed command correction can be started from the correction start time determined before the switching time of the weaving conditions. It is possible to control the weft density unevenness with a margin. In particular, when the weaving conditions are switched, the effect of driving the winding roll 13 as a warp traveling member in the correction direction is reflected in the actual pre-weaving (weave) position, so the intended purpose is effective. Function. This effect makes it possible to make the weft density unevenness, which easily occurs when the weaving conditions are switched, less noticeable and improves the quality of the fabric.

Next, FIG. 12 shows another example of speed correction. In FIG. 12, the speed setting example circled number 1 indicates the speed to the take-up motor 21 as a drive considering the difficulty of transmission to the warp yarn (before weaving), for example, by reducing the loom rotational speed (as a measure for thinning). When temporarily reducing the command value, perform deceleration driving exceeding the appropriate correction amount for the pre-weaving position, and then perform acceleration driving to return to the appropriate amount, and then follow the speed change line of the descending slope. Decreases and finally reaches the rotational speed v2. Conversely, a deceleration drive for returning to an appropriate amount after the acceleration drive is also conceivable.

In FIG. 12, the speed setting example circled number 2 is an example in which the deceleration drive is performed not only once but intermittently divided into a plurality of times in the speed correction period. In the example of the circled number 2, deceleration driving is performed twice in the initial stage and the final stage of the speed correction period. When the one-time and two-time deceleration drives are completed, the rotation speed of the winding motor 21 decreases along the rotation speed v1 that is the base speed serving as a reference or the speed change line of the descending gradient, and finally the rotation speed v2. It becomes. Again, as with the circled number 1 in the speed setting example, when two times of deceleration driving are completed, the speed is temporarily increased to return to the appropriate amount, and then decreases along the speed change line of the descending gradient. It is possible to make it.

As described above, the correction method for the speed command is not limited to the form in which the correction is made by the parameter for the output base speed. For example, as described later, a speed pattern is created in consideration of the speed correction with respect to the base speed in advance, and when the speed correction period is reached, driving based on the created speed pattern is changed from driving based on the base speed thus far. It is also possible to drive by switching to. Further, instead of such a method, a parameter for calculating the base speed is substituted as a correction parameter. For example, the setting of the driving density in the correction period and the weft density in the weaving position relative to the normal density are used. A value that is changed stepwise in consideration of correction may be set through a setting device, and the speed correction may be realized by generating a base speed based on the weft density setting value changed stepwise. .

The speed command correction mode includes a constant speed correction over time and a speed correction that changes over time (specifically, increases or decreases). The correction mode may be corrected stepwise (stepwise) instead of the continuous correction shown in FIG. Also in the example of FIG. 12, the correction start timing of the speed correction period is set in the same manner as in FIG.

FIG. 13 shows still another example of speed correction. In this speed correction mode example, during the weaving operation, the two elements of the fabric structure and the selected weft yarn type are switched as the weaving conditions, and when the two elements are switched, the rotational speed of the loom main shaft remains unchanged. What is maintained is shown as an example.

More specifically, when the weft insertion pick number reaches 100 during the weaving operation, the selection signal (switching signal) generation unit 49 sends the weft selection signal to the weft insertion control unit for switching the selection of the weft 10. In this example, a woven fabric switching signal is generated for switching the woven fabric at the same time as the output to 46. At this time, the weft insertion control unit 46 switches the weft 10 to be inserted from the weft CL1 (weft 1-thick) to the weft CL2 (weft CL2-medium).

At the same time, the selection signal (switching signal) generation unit 49 switches the fabric structure from the plain weave W1 to the 2/1 twill weave W2 based on the fabric structure switching signal, and the switching signal and opening adapted to the fabric structure after switching. A frame selection signal is generated, and the signal is given to the aperture driver 51. For this reason, the opening drive unit 51 drives the plurality of reeds 5 in the order corresponding to the 2/1 twill weave W2.

In this example, the weaving conditions are the thickness of the weft 10 and the woven structure, but both of these elements (the thickness of the weft and the woven structure) act in the direction of decreasing the weft binding force. In general, the weft binding force received from the warp yarn 10 in the woven fabric is considered to have the following tendency. In the case of woven fabrics, plain weave is the strongest, followed by twill weave and satin weaving in that order. In addition, when weft yarn types are considered, the one that tends to generate frictional force (for example, cotton yarn) is the strongest and the frictional force is small. If the thickness of the weft is considered on the premise of the same weft yarn type, it is considered that the thick weft becomes stronger and conversely the thinner weft becomes weaker.

In the case of this example, since both the fabric structure and the thickness of the weft 10 are switched in the direction in which the binding force of the weft 10 is weakened, if no countermeasures against uneven weft density are taken as a result, the above two As a result of the significant decrease in the weft restraining force with the switching of the elements, the weft thread 10 immediately before or near the switching is subjected to strike reaction against the weft thread 10 after the next time, and the weft thread 10 Moves in the direction in which the weft binding force is weak, that is, in the warp side, resulting in a coarse weft density. In addition, for the weft 10 that has been inserted after or near the switching, the weft 10 is driven further into the winding side as the weft 10 that has been inserted next time is beaten due to a decrease in the weft restraining force. As a result, the weft density during this period becomes denser than the weft density of the woven fabric woven before switching. In other words, before and after the switching, there arises a problem that a coarse to dense weft density unevenness occurs in the woven fabric 8.

Therefore, in the example of FIG. 13, the winding speed is reduced from the normal base speed over the speed correction period from two picks before the switching of the two weaving elements, and simultaneously with the switching of the two elements, By setting the winding amount of the woven fabric to be larger than the normal base speed, by realizing the above-mentioned temporary speed correction, the hammering force is sufficiently actuated before weaving and the weft is driven strongly, The movement of the weft due to the reaction is reduced so that the unevenness of the weft density is less noticeable.

As a countermeasure against the occurrence of unevenness in the weft density, the winding control unit 24 and the delivery control device 23 in the warp control device 22 correspond to the weft density (driving density) and the rotation speed of the loom 1 as in the above example. Whether to output according to a base speed to be output or according to a predetermined speed pattern can be switched by a correction operation selection signal. This correction operation selection signal is sent from a selection signal (switching signal) generator 49.

Therefore, as an example, if the selection signal (switching signal) generation unit 49 outputs a speed correction operation selection signal only to the winding control unit 24 at the rotation angle 0 ° of the weft insertion pick number 98, the winding control unit 24 is determined in advance via the setter 47 from the follow-up control to the base speed from the two picks before the switching of the elements (weft insertion pick number 98) to the four picks after the switching (weft insertion pick number 104). By temporarily switching to driving that follows the speed pattern to be performed and rotating the winding motor 21, the above-mentioned uneven weft density (coarse → fine) becomes less noticeable.

Specifically, the rotational speed of the winding motor 21 was the rotational speed v4 (base speed vb) up to the weft insertion pick number 97, but by switching the drive to the drive that follows the speed pattern, the weft insertion After decreasing from a pick number 98 to a weft insertion pick number 99 to a rotational speed v5 at a constant gradient and rapidly increasing to a rotational speed v6 higher than the rotational speed v4 (base speed vb) in a section of a weft insertion pick number 100 The speed gradually decreases over the section where the weft insertion pick number 104 is finished, and settles to the rotational speed v4 (base speed vb) before entering the weft insertion pick number 105.

The speed correction period in the example of FIG. 13 is from 5 picks before switching between two weaving elements (rotation angle 0 ° of weft insertion pick number 98) from 2 picks before switching between two weaving elements (weft insertion pick). The rotation angle is 360 ° (number 104), but the start point of the speed correction period, as indicated by the encircled numbers 1, 2, and 3 in the example, is before a dozen picks before switching the weaving conditions. The end point of the speed correction period can be set at the same time as switching, before switching, or after ten or more picks of switching.

Although the yarn type of the weft 10 and the yarn type information corresponding to the selection signal for the fabric structure and the fabric structure information are not shown, they are input on the setting screen as in the first embodiment. On the other hand, the selection command mode, that is, the selection pattern is input via the screen shown in FIG. On the other hand, although the numerical value input screen to the setting unit 47 for preventing the weft density unevenness prevention is omitted, the switching of the elements related to the weft binding force is performed by the same screen as FIG. 9 in the first embodiment. Is input in response to.

The speed correction of the winding speed is not limited to the direction in which the weft binding force decreases, but conversely, it can be considered to correspond to the switching in the increasing direction. Furthermore, the speed correction is performed so as to correct before and after the switching as shown in FIG. 12, but if either one before or after the switching can be ignored, only the other can be set. Further, the setting mode of the correction amount of the winding speed is not limited to the example shown in the figure, but can be considered in the same manner as in the first embodiment, such as stepped, constant output over time, or multiple intermittent operation.

Regarding the elements related to the weft restraining force, attention may be paid only to the type of the weft 10, particularly its thickness (count). The combination of the elements related to the weft restraining force is not limited to the woven fabric structure and the weft yarn type, and may be two or more of the above-described woven fabric structure, the weft yarn type, and the weft driving density.

In addition, regarding the correction amount setting for the winding speed, the correction amount is specifically determined by the operator by appropriately performing trial weaving, and adjusted by looking at the state of the fabric at the trial weaving stage after weaving. It is conceivable that the correction amount (recommended value) is automatically determined using a database or a function using an element related to the weft binding force using a value obtained from experience.

For example, there is a cover factor for woven fabric as a numerical value serving as a measure of the weft binding force. Regarding the correction amount (recommended value), first, the cover factor of the woven fabric can be calculated, and then the correction value can be determined based on the obtained cover factor.

The cover factor CF of the woven fabric can be defined by the following equation using the warp cover factor CFw and the weft cover factor CFp.
CF = CFw + CFp

The warp cover factor CFw and the weft cover factor CFp are given by the following equations. CFw = A × 2.4 / √B,
CFp = C / √D.
However, the parameters A, B, C, and D in the above formula represent the following.
A: Number of warp yarns per unit woven width length (specifically, A = total number of warp yarns / thread width. B: Thickness of warp yarns)
C: Setting driving density D: Weft thickness (count)

The numerical value of the woven fabric structure is determined in the form of a ratio with the plain weave as the reference value (100%). For example, 80% for 2/1 twill weave, 70% for 3/1 twill weave, 65% for 4 satin, etc., and so on, are selected as appropriate from a plurality of coefficients corresponding to the type of tissue. Therefore, a result (for example, a multiplication result) calculated by a mathematical formula in which a coefficient corresponding to the fabric texture is further added to the cover factor of the above formula is regarded as a numerical value that serves as a guideline for the weft binding force. It is also possible to calculate the numerical values of the weaving elements before and after switching and determine the correction amount based on the two values. It is desirable to provide the database and functions from the loom manufacturer.

[Other Embodiments]
The switching of the weaving conditions is a change in the rotational speed of the main shaft 17 in the examples of FIGS. 11 and 12 and a change in the weft yarn type and woven structure in the example of FIG. The change of the yarn type / weave structure may be switched simultaneously in combination, and the warp traveling member can be moved in a direction to reduce the weft density unevenness at the time of the simultaneous switching. In this simultaneous switching, the winding speed correction amount (speed correction pattern) is determined in consideration of both of the switching.

In each of the above examples, they are specifically modified and embodied as follows. It is desirable that the temporary correction in the warp control device 22 be performed in a range after a dozen picks before the start of switching and after a dozen picks after the end of the change.

Instead of the winding side, the sending side (warp beam 3) may be driven. When driving the delivery side (warp beam 3), it is more preferable that the tension control unit 63 in FIG. 5 suppresses the speed correction accompanying the tension control while the correction operation selection signal is input. This is advantageous because the speed correction is not canceled by the correction accompanying the tension control. Alternatively, both the winding side and the sending side may be driven. In addition, a setting in which the correction rate (speed correction amount, correction period) is different between the winding side and the sending side is also conceivable. In any case, a higher effect on the unevenness of the weft density can be expected.

The warp control device 22 includes at least one of a winding control unit 24 that drives the clothing roll 13 and a delivery control unit 23 that drives the warp beam 3. In addition to the above temporary correction, the sending control unit 23 suppresses the speed command correction component by the control (tension control) based on the tension deviation with respect to the set target tension. In the process of this suppression, tension control may be invalidated. Thereby, since the speed correction based on the tension control on the delivery side is suppressed, the above-described temporary speed correction is not canceled by the so-called tension control result, so that the effect of preventing uneven weft density can be expected more.

Further, the warp control device 22 generates the speed command based on the base speed using the rotation speed of the main shaft 17 as a parameter, and the correction rate and the speed correction for the base speed as parameters relating to the correction amount of the speed command. A period is preset, and when the correction start time is reached during the weaving operation, the warp control device 22 sends a speed command based on a calculation result based on the correction rate to the base speed over the correction period. By generating, the speed command is corrected. In this way, since the speed correction amount is input as a ratio (numerical value) to the base speed, setting and adjustment can be easily performed for the operator.

Each of the above examples is an example in which the speed of the winding speed associated with the switching is controlled by the rotation angle of the main shaft 17, but a configuration in which the control is performed based on time instead of the rotation angle of the main shaft 17 is also possible. . When controlling based on time, the start point of speed correction is set as an angle, and the speed correction period is set as time. Also, the speed correction start time can be set as the elapsed time from a predetermined angle.

In each of the above examples, the speed correction start timing and the speed correction period for the warp control device 22 can be arbitrarily set by the operator via the setting device 47. For example, the worker may set only the speed correction amount. Taking as an example a case corresponding to the switching of the rotational speed of the main shaft 17 of the loom 1, the setting parameters related to the start timing and the correction period of the speed correction for the warp control device 22 are also used as the setting parameters related to the main shaft rotation speed change. Things can also be considered. Alternatively, the correction period for the speed command is not set, but the speed correction period may be automatically ended when the actual machine state, for example, the loom rotational speed reaches the target speed. The present invention includes such a configuration.

The structure which drives the member which contacts the warp 2 other than the warp running member (cloth winding roll 13 and warp beam 3) is also considered. As an example, when the easing mechanism is attached to the back roll 4 and the easing mechanism is driven by an actuator, for example, when the rotational speed of the main shaft 17 of the loom 1 is decelerated, the speed correction period in the above-described example is used as a countermeasure for the thin stage. The position of the back roll 4 is temporarily moved backward. In addition to the back roll 4, an electric opening device in which each hook frame is driven by an actuator is also conceivable. At that time, for example, when the loom speed is reduced, the opening amount is temporarily increased during the speed correction period in the above-described embodiment. And driving such as changing the dwell period (stop angle). Combination driving with the above-described warp running member is also conceivable.

In the present invention, a steady operation state (a state in which the loom 1 is re-operated to reach a steady rotational speed) and after is a target, but a transient rotational state (before the loom 1 is re-operated to reach a steady rotational speed). It is also applicable to. The setting of the transient rotation state in that case may be set by taking into account the factors that change depending on the transient rotation state with reference to the steady operation state.

It is a side view of the principal part of a loom, especially a warp path. It is a block diagram of the principal part of a loom, especially the part relevant to weft insertion. It is a block diagram of the control system of a loom. It is a detailed block diagram of the winding control part of a loom. It is a detailed block diagram of the sending control unit of the loom. It is explanatory drawing of the selection signal setting input screen of the touch panel as a setting device. It is explanatory drawing of the screen at the time of the input of the rotational speed setting of the touchscreen as a setting device. It is explanatory drawing of the screen after an input of the rotational speed setting of the touch panel as a setting device. It is explanatory drawing of the screen regarding the density nonuniformity prevention of the touchscreen as a setting device. It is explanatory drawing of the confirmation screen regarding density unevenness prevention of the touch panel as a setting device. It is explanatory drawing of the winding motor operation | movement aspect before and behind switching of the rotational speed of a main axis | shaft. It is explanatory drawing of the winding motor operation | movement aspect before and behind switching of the rotational speed of a main axis | shaft. It is explanatory drawing of the winding motor operation | movement aspect before and behind switching of the rotational speed of a main axis | shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Loom 2 Warp 3 Warp beam 4 Back roll 5 綜 絖 6 筬 7 Opening 8 Woven cloth 9 Weaving 10 Weft 11 Guide roll 12 Press roll 13 Clothing roll 14 Press roll 15 Fabric winding roll 16 Spindle motor 17 Spindle 18 Opening device 19 Strike Motion conversion device 20 Sending motor 21 Winding motor 22 Warp control device 23 Sending control unit 24 Winding control unit 25 Weft holder 26 Yarn supply body 27 Weft measurement length storage device 28 Rotating yarn guide 29 Drum 30 Locking pin 31 Drive motor 32 Actuator 33 Main nozzle 34 Pressure air source 35 Pressure air 36 Air supply line 37 Pressure adjustment valve 38 Electromagnetic on-off valve 39 Sub nozzle 40 Pressure adjustment valve 41 Air supply line 42 Electromagnetic on-off valve 43 Weft cutter 44 Weft feeler 45 Main controller 46 Weft insertion control unit 47 Setting device 48 Angle detector 49 Selection signal (switching Signal) generating unit 50 main driving unit 51 opening driving unit 52 driving unit 53 driving unit 54 inverter 55 loom operation button 56 base speed generating unit 57 correction signal generating unit 58 pulse generating unit 59 forward / reverse counter 60 current generator 61 pulse generator 62 Base speed generation unit 63 Tension control unit 64 Correction signal generation unit 65 Pulse generation unit 66 Tension sensor 67 Reel diameter sensor 68 Forward / reverse counter 69 Current generator 70 Pulse generator

Claims (4)

During the weaving operation, the warp running member (3, 13) is driven by the generated speed command to control the running of the warp (2), and a plurality of weaving conditions are set in advance.
During the weaving operation, in the loom (1) that switches the weaving conditions with the update of the weft insertion pick number,
In the warp control device (22), a correction amount for the speed command is set in advance corresponding to the switching of the weaving conditions,
When the weaving conditions are switched during the weaving operation, the warp control device (22) is driven according to the correction according to the correction of the warp running member at the correction start time determined before the switching time of the weaving conditions. From the correction start time determined so that the effect is reflected at the position of the pre-weaving (9) at the time of switching of the weaving conditions, the speed command is canceled according to the correction amount, and unevenness in the weft density due to the switching of the weaving conditions is eliminated. A method of preventing weft density unevenness in a loom characterized by temporarily correcting the direction. 2. The method of preventing weft density unevenness in a loom according to claim 1, wherein the correction start time is set after ten or more picks before the start of switching of the weaving conditions. 3. The method of preventing weft density unevenness of a loom according to claim 1, wherein the weaving conditions include at least one of a weft type, a weft density, a fabric structure, and a rotational speed of the loom. The warp control device (22) includes at least one of a winding control unit (24) for driving the clothing roll (13) and a delivery control unit (23) for driving the warp beam (3). The method of preventing weft density unevenness in a loom according to claim 1, 2 or 3.

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