JP2010270431A - Method for preventing weft yarn density of loom from unevenness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make weft yarn unevenness (Barre) which generates accompanying the switching of weaving conditions less conspicuous, in a loom in which elements related to the weft restranining force while performing a weaving operation of the loom. <P>SOLUTION: A speed command signal to warp yarn-traveling members 3, 13 is corrected to the direction to eliminate generation of the weft yarn density unevenness accompanying switching at least two of textile texture, kind of weft, and weft picking density as elements related to the weft yarn restraining force in the loom 1 in which warp yarn 2 is set to travel by driving the warp yarn-traveling members 3, 13 by a speed command signal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a weft density unevenness (weaving) generated by the switching in a weaving machine that switches at least one of the elements related to the rotational speed of the main shaft of the loom and the weft restraining force of the weaving cloth during the weaving operation of the loom. It relates to a technique that makes the stage less noticeable.

Patent Document 1 discloses a warp control device for a loom, that is, a base speed corresponding to a preset weft driving density and a rotation of a crank angle of the loom, in other words, a base speed corresponding to a weft density and a rotation speed of a main shaft of the loom. Accordingly, a warp control device for driving a clothing roll and a delivery beam by a motor is disclosed.

In addition to Patent Document 2, Patent Document 3 discloses a multicolor weft insertion loom that actively changes the rotational speed of the main shaft according to the weft insertion pick number. Specifically, these multi-color weft insertion looms set the weft selection information corresponding to the weft insertion pick number, and select the spindle rotation speed in consideration of the weft flying characteristics at the time of weft insertion. Each weft yarn type is set in advance, and during operation of the loom, the operation is performed at the rotational speed of the main shaft corresponding to the selected weft based on the weft insertion pick number updated as the loom operates. Further, the technique of Patent Document 4 aims to eliminate the weaving steps caused by machine stoppage, and sets the correction amount of the pre-weaving position in advance for each number of machine table rotations after re-operation. In operation, it is disclosed to drive a winding motor or a delivery motor as a warp traveling member according to the correction amount corresponding to the detected number of rotations of the loom.

In Patent Document 5, a plurality of weft densities are set in advance as weaving conditions, and a weft control device that rotationally drives a take-up roller or a delivery beam at a command speed corresponding to the switching of the weft density during the weaving operation of the loom. A technique is disclosed in which the command speed is corrected according to a change in the amount of movement of the pre-weaving position accompanying the change in the weft density when the weft density is changed (after the change point).
Patent Document 6 is a loom that changes the fabric structure in response to the update of the weft insertion pick number. When the fabric structure is switched (after the switching time), the change in warp tension due to the change of the fabric structure is described. Discloses a technique for temporarily changing the rotational speed of the winding motor so as to cancel out the changing action of the pre-weaving position caused by the above.

When both the rotational speed of the main shaft of the loom and the factors related to the weft binding force are switched, the weft density unevenness becomes even more noticeable. In particular, when the factors related to the rotational speed of the main shaft of the loom and the weft restraining force are simultaneously switched, the unevenness of the weft density becomes more remarkable.

JP-A-62-263347 JP-A-5-78955 JP 2000-96389 A JP-A-1-298247 JP-A-2-182945 JP-A-2-259141

When the rotational speed of the main shaft of the loom is greatly changed, there is a problem that uneven weft density (weaving step) occurs near the switching of the rotational speed of the main shaft. One of the causes is that the beating motion is performed in synchronization with the rotation of the main shaft of the loom. As a result, the speed of movement of the kite changes depending on the rotation speed of the main shaft. This is thought to be due to the change in quantity (ie, strike point).

For example, when the rotation speed of the main shaft is switched from a high rotation speed to a low rotation speed, in the vicinity of the rotation speed switching time, in the woven fabric, the weft density of the woven portion becomes coarser than the normal density, and the thin step Occurs. This is thought to be because when the rotational speed of the main spindle is reduced, the hammering force of the oscillating drive is fluctuated, the amount of deflection of the hammer is reduced, and the hammering point moves backward (rear side of the loom). It is done. Concerning the switching of the rotation speed of the spindle, there is also a switching to a higher direction, and in this case, a thick step occurs.

So far, there is no known technique for eliminating unevenness in the weft density caused by switching of the rotational speed of the loom during the weaving operation after reaching the steady rotational speed after the start of the machine base re-operation.

Each of the techniques of Patent Document 5 and Patent Document 6 merely considers the amount of movement of the pre-weaving position that accompanies switching of the weft density and the fabric structure. For this reason, in the fabric in which the fabric structure is switched by the weft insertion pick number, weft density unevenness occurs before and after the weft switching stitch. With regard to the phenomenon in which such weft density unevenness occurs, the inventors of the present application have found from research that the binding force of the fabric (that is, the weft binding force from the warp) is caused by changing to the fabric structure. .

When both the rotational speed of the main shaft of the loom and the factors related to the weft restraining force are switched, unevenness in the weft density becomes even more noticeable, but the speed of the warp running member is corrected in consideration of the switching between them. There has never been a technology to do so.

(Object of invention)
It is an object of the present invention to provide uneven weft density generated by the above switching in a loom that switches at least one of factors related to the weft restraining force or the rotational speed of the main shaft of the loom during the weaving operation of the loom. To make it less noticeable.

Based of the above problems and objects, the present invention is the speed command signal, and drives the warp traveling member, in the loom to run the warps, upon switching the element associated with the weft binding, with the above Setsu換Ri The speed command signal is corrected in a direction to eliminate the weft density unevenness that occurs.

The warp traveling member includes one or both of a clothing roll and a warp beam. In addition to the above, an opening device, an easing device, and the like are also conceivable as members that affect the warp running (pre-weaving position). The correction start timing of the speed command signal is set to the near timing before and after the switching during the switching. The range of the near period before and after switching is specifically about a dozen or more picks, and actually 10 picks or less. The value related to the speed correction amount includes parameters such as a correction start time, a correction period, and a speed correction amount (ratio), and at least the speed correction amount is set in advance.

The present invention corresponds to claim 1, relating to the switching elements associated with the weft binding. For example, switching by only the weft yarn type is not included, but switching by using a combination of two or more elements among the weft yarn type, density, and fabric structure is included . In addition, Claim 2 thru | or Claim 5 is dependent on said Claim 1 .

For example, weft density unevenness includes a warp control device that controls the warp running by driving the warp running member according to the generated speed command during the weaving operation of the loom, and during the weaving operation after the loom reaches the steady rotational speed Further, in a loom that switches the rotation speed of the main shaft of the loom from one set rotation speed to the other set rotation speed by the updated weft insertion pick number, the warp control device has a correction amount for the speed command that is the rotation speed of the main shaft. In accordance with the change of the rotation speed, the warp control device eliminates the unevenness of the weft density due to the change of the rotation speed according to the set correction amount. Further, it can be prevented by temporarily correcting the speed command. The correction amount of the speed command may be set corresponding to at least one of the difference between the two set rotational speeds and the direction of change of the rotational speed. When the rotation speed is switched, if the difference between the two set rotation speeds is different, a setting corresponding to the magnitude of the difference can be considered.

The cause of the weft density unevenness due to the change in the rotational speed of the main shaft of the loom is considered to be due to the change in the punching speed (change in the amount of warp deflection). More specifically, this is because the final reach position (striking point) of the kite changes in the front / rear direction of the woven fabric depending on the rotational speed of the main shaft. The manner of changing the rotational speed of the main shaft, and the weft density unevenness caused thereby are as follows. That is, when the rotation speed of the main shaft changes from low to high, the amount of deflection of the heel when striking changes from small to large (in other words, the striking force during striking changes from low to high). Since the mode of unevenness of the weft density is dense (thick stage), the speed correction mode increases the speed and increases the feed amount / winding amount. Conversely, when the rotational speed of the main shaft changes from high to low, the weft density unevenness becomes coarse (thin), so the speed correction mode reduces the speed and reduces the feed amount / winding amount. become.

Incidentally, for the purpose of switching the rotational speed of the spindle, specifically, the following examples of positive changes can be considered. The first is to change the rotational speed of the main shaft according to the weft yarn type in consideration of the difficulty of weft insertion. In a fluid jet loom, when wefts that are difficult to fly and are difficult to weft are inserted, the weft insertion time (running period) is lengthened by lowering the rotational speed of the spindle. For example, in order to switch to a weft having different weft flying characteristics between a ground weaving portion and a pile weaving portion in a pile loom, the rotational speed of the main shaft is made different. Second, the rotational speed of the main shaft is changed by the fabric structure. Depending on the fabric structure, when vibration occurs due to the unbalanced load of the opening device, it is expected that the vibration will be suppressed or the life of the loom device will be extended by lowering the rotation speed of the main shaft. The third is to change the rotation speed of the spindle depending on the number of staff at the weaving factory. In a time shift with a small number of staff, for example, at midnight, the rotation speed of the spindle is lowered to avoid stopping. Further, as an example of the negative change, it is assumed that control for changing the rotational speed of the spindle according to the slowness of the weft flying timing is performed in order to make the weft flying timing constant.

On the other hand, the weft density unevenness prevention method of the loom according to the present invention drives the warp beam or the cap winding roll or the warp beam and the cap winding roll as the warp running member according to the speed command generated during the weaving operation of the loom. A warp control device for controlling the running is provided, and during the weaving operation, 2 of the weaving structure, the weft yarn type and the weft driving density as elements related to the weft restraining force of the woven fabric, depending on the weft insertion pick number updated. In a weaving machine that switches two or more elements to different conditions, a correction amount for the speed command signal is set in advance in the warp control device corresponding to the switching of the two or more elements, and during the weaving operation, the 2 When the above elements are switched together and the weft binding force changes, the warp control device 22 sends the speed command to the two or more speeds according to the set correction amount. Characterized by temporarily correcting the direction for eliminating the weft density unevenness due to Setsu換Ri prime.

Elements relating to the weft binding force of the woven fabric that is switched during the weaving operation exclude only the woven fabric structure or only the weft driving density. Regarding factors relating to the weft restraining force as the weaving condition, for example, it is considered that the warp yarn type and the warp density are also related, but these conditions are not included because these conditions cannot be switched during the weaving operation.

The cause of the unevenness of the weft density is considered to be that the weft itself moves in the direction in which the weft restraining force becomes uniform due to the impact of the beating due to the switching of the weft restraining force. Between the first beat and several picks, the restraining force from the warp is weak. However, in response to the beat-up reaction to the wefts inserted thereafter, it gradually moves to the woven fabric winding side and becomes a normal weft density. On the other hand, when the weft binding force from the woven fabric (warp) is switched, the weft at the switching point (boundary) moves to the winding side in response to the impact of the beating after the weft insertion. The amount of movement changes.

As a result, the weft yarn at the switching point (boundary) and the weft yarns before and after the weft are under the condition that the weft restraint force immediately after weaving is weak, and the weft opening is changed by switching the elements related to the weft restraint force. The tension relationship in the vicinity of (pre-weaving) changes, and as a result of the impact of beating on the wefts after the weft insertion, the wefts themselves move in a direction in which the weft restraining force becomes uniform.

As described above, the elements related to the weft binding force are the fabric structure, the weft type, and the weft driving density. With regard to the woven fabric structure, the weft binding force tends to be high in plain weave and low in twill weave. Regarding the weft yarn type, the weft binding force tends to be high for cotton yarn having a large frictional force, and tends to be low for synthetic fiber having a small frictional force. Further, with respect to the weft thickness, the weft restraining force tends to be higher for thick yarn and lower for thin yarn. The switching mode of two or more elements is not limited to simultaneous switching, but includes switching where the switching timing of any one or more elements deviates within a range of several picks from the switching timing of the remaining elements. It is.

Changes in the elements relating to the weft restraining force and the generated weft density unevenness are as follows. When the weft restraint force is switched from high to low, the uneven weft density that occurs in the weaving part after switching becomes dense (thick), so the speed correction mode increases the speed and the feed amount / winding It will increase the amount taken. On the other hand, when the weft restraining force is switched from low to high, the uneven weft density that occurs in the weaving part after switching becomes rough (thin), so the speed correction mode is speed. This will reduce the feed / winding amount.

In addition, when density unevenness also occurs in the weaving portion before switching, speed correction may be performed before the switching. When the degree of influence of one of the before and after switching is small (that is, negligible), only the other can be set.

Further , the weft density unevenness is provided with a warp beam control device for controlling the warp running by driving the warp beam or the winding roll as the warp running member by the speed command generated during the weaving operation of the loom. The weft insertion pick number updated during weaving operation maintains the fabric structure and weft driving density as elements related to the weft restraining force of the woven fabric while maintaining the weft yarn type as the element under different conditions. In the weaving machine, the warp control device is preset with a correction amount for the speed command signal corresponding to the switching of the weft yarn type, and the weft yarn type is switched during the weaving operation. Accordingly, when the weft binding force changes, the warp control device sends the speed command according to the set correction amount and the weft density according to the change of the weft type. It can be prevented by temporarily corrected in a direction to eliminate the unevenness.

Incidentally, the weft density unevenness can be prevented by the combination of the switching elements associated with the switching and weft binding of the rotational speed of the main shaft of the loom. For example, the warp control device temporarily corrects the speed command in accordance with the set correction amount in a direction to eliminate the weft density unevenness caused by the change in the rotational speed of the loom spindle and the weft binding force. To do.

According to the present invention, unevenness of the weft density that occurs when the elements related to the weft restraining force are switched can be made less noticeable, and the quality of the fabric is improved.

Incidentally, in the warp control device, a correction amount for the speed command signal is set in advance in consideration of a change in the beating speed (change in the bend amount) associated with the change of the rotation speed of the spindle. For this reason, during the weaving operation, the speed command for the warp traveling member is temporarily corrected in accordance with the correction amount in the direction to eliminate the weft density unevenness in accordance with the switching of the rotational speed of the main shaft. By positioning the pre-weaving position at the time of beating at the time of the change in the above-described position, unevenness in the weft density due to a change in the hitting speed, which has conventionally occurred, can be made less noticeable. This improves the quality of the fabric.

On the other hand, according to the present invention, the correction amount for the speed command signal is set in advance in the warp control device in consideration of the movement of the weft due to switching of the elements related to the weft binding force. For this reason, during the weaving operation, the speed command for the warp traveling member is temporarily corrected in accordance with the correction amount in the direction to eliminate the weft density unevenness in response to switching of the elements related to the weft binding force. The conventional weft density unevenness, that is, the amount of movement of the once weaved weft itself in the direction in which the weft restraining force becomes uniform due to the impact at the time of subsequent beating, can be suppressed. Further, the weft density unevenness caused by the restraining force of the wefts that changes as the two elements are switched can be made less noticeable. Therefore, the textile quality is improved.

In addition, when the speed of the main shaft and the elements related to the weft restraining force are simultaneously switched, unevenness of the weft density can be made less noticeable by setting the warp speed correction amount in consideration of the above two switching. Accordingly, the quality of the fabric is further improved.

[Effects of dependent claims]
When the temporary speed correction in the warp control device is started in the range before and after the tenth pick before the start of the switching and before the tenth pick after the end of the change, the weft that spreads before and after the switching Density unevenness is effectively suppressed.

The warp control device generates the speed command based on a base speed whose parameter is the rotation speed of the spindle, and a correction rate and a speed correction period for the base speed are parameters as a correction amount of the speed command. Since the warp control device is preset and temporarily corrects the base speed by generating a speed command based on the calculation result based on the correction rate, the speed correction amount is a ratio (numerical value) to the base speed. Therefore, setting and adjustment can be easily performed for the operator.

The warp control device can be one of a winding control unit that drives the clothing roll and a sending control unit that drives the warp beam. For example, according to the case of speed correction only for sending, the speed only for winding The same effect can be expected although the function is slightly inferior to that of the correction. In addition, if both the winding and sending speeds are corrected, an effect of preventing density unevenness can be further expected.

In addition to the temporary correction, the transmission control unit further suppresses the speed correction based on the tension control on the transmission side when suppressing or invalidating the speed command correction component based on the tension deviation with respect to the set target tension. Therefore, the effect of preventing the weft density unevenness can be expected more.

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 touch panel as a setting device. It is explanatory drawing of the screen after the 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 the density nonuniformity 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.

[Outline of loom]
FIG. 1 shows a main part of the loom 1, particularly the entire warp system. In FIG. 1, the warp 2 is sent out as a sheet from the warp beam 3, passed through the plurality of ridges 5 and 6 through the back roll 4, and reaches the pre-weave 9 of the woven fabric 8 while forming the openings 7. Yes.
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 front 9 by a heel 6 to form a woven fabric 8 structure. The woven fabric 8 is wound around a fabric winding beam 15 through a guide roll 11, a press roll 12, a clothing roll 13 and a 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 warp beam 3 and the clothes winding roll 13 constitute a warp traveling member because both or only one of them rotates to move the warp 2 back and forth. For example, if the clothing roll 13 is rotated excessively in the winding direction when the rotation speed of the main shaft 17 is switched in the course of the original winding control, the warp yarn 2 moves in the winding direction (forward) together with the woven fabric 8. Therefore, the fabric 9 will also move in the same direction.

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, and the weft 10 that has been wound around the yarn winding surface of the drum 29 is moved back and forth from the yarn winding surface of the drum 29. 29, the length necessary for one weft insertion is unraveled 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 10 in the vicinity of the weft end portion on the weft arrival side, and is provided at a position where the weft 10 inserted normally can reach. The arrival is detected, the success or failure of the weft insertion is determined, a weft stop signal is output when the weft insertion is defective, and this is sent to the main control unit 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 10, 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 a setting unit 47. 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, the feeding control unit 23 inside the warp control device 22, the winding control unit 24 inside the warp control device 22 , a main control unit 45, a weft insertion control unit 46, a selection signal (switching signal) generation unit 49, and a main drive The unit 50 operates in synchronization with the main motion of the loom 1 by using the rotation angle θ signal output from the angle detector 48 connected to the main shaft 17 of the loom 1 as an input.

In addition to the set value data and signal from the setting device 47 and the weft stop signal from the weft yarn filler 44, the main control unit 45 gives instructions such as operation / stop / inching / reverse rotation from the plurality of loom operation buttons 55. The loom 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 feed control unit 23 and the take-up control unit 24) to control the operation thereof. The main control unit 45 and the inverter 54 control the main shaft motor 16 during operation of the loom 1.

The selection signal (switching signal) generator 49 receives the set value data and signal input from the setting unit 47 and the rotation angle θ signal output from the angle detector 48 as input, and a weft selection signal and an opening frame selection signal. , A speed switching signal, a driving density selection signal and a correction operation selection signal are generated, the weft selection signal is sent to the weft insertion control section 46, the opening frame selection signal is sent to the opening drive section 51 of the opening device 18, and the speed switching signal is mainly sent. Each is sent to the drive unit 50, 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 and reaches the rotation angle θ set in advance according to the yarn type of the weft 10 so that the electromagnetic on-off valves 38 and 42, the actuator 32 of the locking pin 30, and the pressure adjustment. The valves 37 and 40 are operated. The opening drive unit 51 of the opening device 18 receives an opening frame selection signal, selects an opening frame (綜 絖 5) suitable for the woven structure, and gives an opening motion thereto. When the main drive unit 50 receives the speed switching signal, the main driving unit 50 switches the current rotational speed to a newly designated rotational speed, thereby causing the spindle motor 16 to rotate at a rotational speed suitable for the yarn type and weave structure of the weft 10. To drive.

Further, the sending control unit 23 receives the driving density selection signal and the correction operation selection signal as input, and the driving unit 52 uses the driving motor 52 based on the rotational speed corresponding to the driving density of the weft 10 (that is, a base speed described later). By driving 20, the warp 2 is sent out. The winding control unit 24 also receives the driving density selection signal and the correction operation selection signal, and the driving unit 53 drives the winding motor 21 at a rotational speed corresponding to the driving density of the weft yarn 10 to thereby weave. The cloth 8 is wound up. 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 generation unit 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 corresponding to 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 winding rotational speed = base speed × {1+ (correction rate / 100)} × coefficient using the base speed, the correction factor, and the 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 controller 63, the output (tension control signal) of the tension controller 63 is invalid. Note that the tension sensor 66 is incorporated in, for example, the support position of the back roll 4 in FIG. 1 and detects the tension value of the warp 2 from the resultant force of all the warp 2 acting on the tension.

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. For detecting the diameter of the warp beam, it is also possible to use a known method of indirect detection 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]
6 to 10 show examples of input screens when the setting device 47 is configured by a touch panel type input display. More specifically, setting data relating to density unevenness prevention for the first embodiment to be described later is input. An example is shown as an example. First, FIG. 6 is an input screen for selection signal setting (opening setting / weft density / weft selection / textile structure / rotation speed). On the left n-5 to n + 6 weft picks on the screen, data setting column regarding the opening mode of each opening frame in the electronic dobby device, and signal data setting regarding the output mode of various selection signals used when controlling the loom There is a column. 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, 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. 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 touch panel screen displayed in this manner. Note that 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 are setting input screens relating to the setting of the rotational speed of the main shaft 17 (switching of the rotational speed). 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 the setting of the rotational speed (switching of the 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 for density unevenness prevention setting / winding speed switching. In this density unevenness prevention setting / winding speed switching screen, the pick number and spindle crank angle as the change start point and the pick as the change end point for each setting 1 (speed switching process 1) and setting 2 (speed switching process 2). The number, spindle crank angle, change start point speed ratio, and change end point speed ratio 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, as in FIG. 7, when an input item is specified by touching each input field, a numeric keypad is displayed on the right side of the screen, and a numeric value can be input into the specified input field by operating the numeric keypad. It has become. FIG. 9 shows the screen after input. 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 data set in the input process from FIG. 7 to FIG. 9 is schematized and displayed as a graph of the rotation speed of the main shaft 17 (main shaft rotation speed) and the winding speed on the axis of the pick number. Each speed pattern of the loom spindle and the winding motor (that is, the speed that is finally output as a result of speed correction with respect to the base speed) automatically generated from the setting data can be confirmed. According to this example, the spindle rotational speed decreases from a main spindle rotational speed of 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 set from 99 picks to 100 according to setting 1. In the interval, the output changes at a predetermined pattern so that the output is 80% with respect to the reference base speed (reference) (that is, the speed is about 44% with respect to the base speed at 99 picks immediately before 101 picks). (I) The base speed is set to be low, and after 101 picks, it is set to output again at the base speed as a reference. 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.

The weft density unevenness prevention method of the loom according to the first embodiment is based on the loom 1 including the warp control device 22 as described above. The loom 1 is an example of switching the spindle rotational speed from one set rotational speed to the other set rotational speed by the updated weft insertion pick number during the weaving operation after reaching the steady rotational speed after starting. . Further, the warp control device 22 is also an example of controlling the travel of the warp 2 by temporarily decelerating the winding roll 13 as a warp travel member in accordance with a speed command generated during the weaving operation. In this warp control device 22, correction parameters including a correction start time, a speed correction period, and a correction amount for the speed command signal correspond to the switching of the spindle rotational speed, and the input process (setting described above) shown in FIG. It has already been set via numeric input).

During the weaving operation of the loom 1, when the correction start time is reached, the warp control device 22 follows the correction parameter set in the direction in which the unevenness of the weft density due to the switching of the rotational speed of the main shaft 17 is eliminated. 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 an explanatory diagram of an operation mode of the winding motor 21 before and after switching of the rotational speed of the main shaft 17 in the first embodiment. 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 above setting process.

On the other hand, the take-up 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 spindle, but the weft insertion pick number 99 to 100 The speed correction is turned on during the speed correction period up to and is lower than the rotational speed v1 at the weft insertion pick number 99 based on the speed correction rate set corresponding to the speed correction period with respect to the corresponding base speed. At the rotational speed v3, at the subsequent weft insertion pick number 100, the speed is further lowered from the speed v3. After that, after the weft insertion pick number 101 after the speed correction period, the rotational speed of the loom spindle is again set as described above. At the point of time when the rotational speed of the main shaft 17 is lowered with a gradient substantially equal to the velocity change gradient based on the corresponding base velocity, and finally the weft insertion pick number 101 is finished. Rolling the speed v2.

In this way, the speed correction operation of the warp control device according to the switching of the rotational speed of the loom main shaft is performed by the functions of the selection signal (switching signal) generation unit 49 and the winding control unit 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, according to the first embodiment, when the weft insertion pick number reaches 100, the weft insertion pick number is 100 in the loom 1 that switches the rotation speed of the main shaft 17 from the high setting rotation speed to the lower setting rotation speed. In response to the striking force that decreases during the subsequent striking, the winding control unit 24 starts from one pick before the start of switching the rotational speed to the low speed based on the base speed according to the correction factor set in advance in the deceleration direction. By reducing the speed command value, the amount of forward movement of the pre-weaving position is suppressed as compared with the prior art, and the position of the pre-weaving 9 is moved to the side of the heel 6 to make the weft density unevenness (thin step) less noticeable. .

Note that the setting of the correction parameters including the correction amount for the speed command can be considered the following aspects. When the operator inputs a 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.

The speed correction period in the first embodiment is like the period of circled numbers 1 to 6 with the weft insertion pick number at which the rotation speed of the spindle is changed as front and rear as seen in the setting example of the speed correction period in FIG. It can also be selected. Further, at the same time when the speed of the winding motor 21 is changed, the same control can be performed on the delivery motor 20. Therefore, this speed control can be executed not only for the take-up motor 21 but also only for the feed motor 20, and can also be executed for the take-up motor 21 and the send motor 20 simultaneously.

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). In the case where the command value is temporarily decreased, in the first embodiment, only deceleration driving is performed in the speed correction period, but deceleration driving exceeding an appropriate correction amount with respect to the pre-weaving position is performed, and then returned to an appropriate amount. Therefore, the driving speed is decreased along the speed change line of the descending gradient and finally becomes 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 method of correcting the speed command is not limited to the form of correcting with the parameter for the output base speed. For example, as in a second embodiment to be described later, a speed pattern is created in advance with respect to the base speed in consideration of the speed correction, and when the speed correction period comes, the above-described creation is performed from the drive at the base speed. It is also possible to drive by switching to driving by a speed pattern. 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.

The second embodiment corresponding to the present invention is a loom 1 that switches two or more elements of the woven fabric 8 as the elements related to the weft restraining force of the woven fabric 8, the weft thread type, and the weft driving density to different conditions. In this example, the speed command is temporarily corrected according to a set correction amount in a direction to eliminate the weft density unevenness accompanying the switching of the two or more elements according to the switching of the conditions.

FIG. 13 is an explanatory diagram of an operation mode example of the winding motor 21 before and after switching of elements related to the weft binding force according to the second embodiment. In the following examples, two elements of the fabric structure and the selected weft yarn type are switched during the weaving operation, and the rotation speed of the loom spindle is maintained as an example when the two elements are switched. Show. 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 driving unit 51 drives the plurality of reeds 5 in the order corresponding to 2/1 twill weave W2.

The elements related to the weft restraining force are the thickness of the weft 10 and the woven structure, but these elements (the weft thickness and the woven structure) both act in the direction of decreasing the weft restraining force. In general, it is considered that the weft binding force received from the warp in the woven fabric has the following tendency. In the case of woven fabrics, plain weave is the strongest, followed by weakness in the order of twill weave and satin weave. In addition, when weft yarn types are considered, the one that tends to generate frictional force (such as 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 the second embodiment, since both the fabric structure and the thickness of the weft are switched in a direction in which the binding force of the weft is weakened, as a result, if no measures against uneven weft density are taken, As a result of the significant decrease in the weft restraining force due to the switching of the two elements, the weft insertion weft immediately before the switching (or in the vicinity thereof) has been subjected to a strike reaction against the weft insertion weft after the next time, As a result of the weft moving in the direction in which the weft binding force is weak (that is, the warp side), the weft density becomes coarse. In addition, for the wefts that have been inserted after (or in the vicinity of) the wefts, the wefts are driven into the take-up side as the wefts are inserted into the wefts after the next time due to a decrease in the weft binding force. As a result, the weft density during this period becomes denser than the weft density of the woven fabric woven before switching. That is, there arises a problem that coarse to dense weft density unevenness occurs in the woven fabric 8 before and after the switching. Therefore, in this embodiment, the winding speed is reduced from the normal base speed before two picks before switching between the two weaving elements, and then the winding amount of the woven fabric is simultaneously switched between the two elements. Is set to be larger than the normal base speed to realize the above-described temporary speed correction, thereby reducing the movement of the weft due to the reaction and making the weft density unevenness less noticeable.

In order to prevent 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 first embodiment. 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 the pick number 98 to the weft insertion pick number 99 to a rotational speed v5 with a constant gradient, and rapidly increasing to the rotational speed v6 higher than the rotational speed v4 (base speed vb) in the section of the 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 here is a section from the rotation angle 0 ° of the weft insertion pick number 98 to the rotation angle 360 ° of the weft insertion pick number 104. As shown in the setting example by two numbers, It can also be set so that the rotation angle 360 ° of the weft insertion pick number 99, which is the time when both the weft yarn type and the fabric structure as the elements are switched, is centered around or across it.

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 second embodiment is not limited to the above example, and can be modified as follows. It is conceivable to cope with switching to a direction in which the weft restraining force decreases, but not to the direction in which the weft binding force decreases.

The speed correction of the winding speed is made so as to correct before and after the switching as shown in FIG. 12, but when either one before or after the switching can be ignored, only the other can be set. is there. 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 warps per unit woven width / length B: Thickness of warp (count)
C: Setting driving density D: Weft thickness (count)
Specifically, parameter A = total number of warps / thread width is obtained.

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 numerical values in 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.

The third embodiment corresponds to a combination of the main part of the first example and the main part of the second example, and at the time of simultaneous switching of two or more elements related to the rotational speed of the main shaft 17 of the loom 1 and the weft binding force. Then, the warp traveling member is moved in a direction to reduce the weft density unevenness.

That is, the weft density unevenness prevention method of the weaving machine of Example 3 is a warp control device 22 that controls the travel of the warp 2 by driving the warp travel member (warp beam 3, the winding roll 13) according to the speed command generated during the weaving operation. During the weaving operation after the loom 1 reaches the steady rotational speed, the rotational speed of the main shaft 17 of the loom 1 is switched from one set rotational speed to the other set rotational speed by the updated weft insertion pick number. Depending on the weft insertion pick number that is updated during weaving operation, two or more elements of the woven fabric, the weft thread type, and the weft driving density as elements related to the weft binding force of the woven fabric 8 are set under different conditions. In the weaving machine 1 to be switched, the warp control device 22 has the correction amount for the speed command when the rotational speed of the main shaft 17 is switched and the two or more elements are switched together. The warp control device 22 sets the speed command in accordance with the set correction amount when the correction start time is reached during the weaving operation. Temporarily correcting in a direction to eliminate the weft density unevenness associated with switching and switching of the two or more elements.

In simultaneous switching between the rotational speed and the elements related to the weft binding force, the winding speed correction amount (speed correction pattern) is determined in consideration of both of the switching.

According to the third embodiment, unevenness of the weft density can be made inconspicuous by setting the speed correction amount in consideration of two switching (switching between the rotational speed of the main shaft 17 and the element related to the weft binding force). Accordingly, the fabric quality is further improved.

[Other Embodiments]
In the said Examples 1-3, they are specifically deformed 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 a base speed whose parameter is the rotational speed of the main shaft 17, and a correction rate and speed with respect to the base speed as parameters relating to the correction amount of the speed command. A correction period is set in advance, and when the correction start time is reached during the weaving operation, the warp control device 22 sends a speed command based on the calculation result based on the correction rate to the base speed. 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.

Although the above embodiment 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, 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 addition, for the above-described embodiment, the speed correction start timing and the speed correction period for the warp control device can be arbitrarily set by the operator via the setting device. The operator may set only the speed correction amount). Taking the case of the first embodiment, that is, the case corresponding to the switching of the rotational speed of the loom main spindle as an example, the setting parameters relating to the start timing and the correction period of the speed correction for the warp control device are also used as the setting parameters relating to the main spindle rotational speed change. It can also be configured. 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.

A configuration in which a member that contacts the warp other than the warp running member (cloth winding roll 13 / warp beam 3) is also conceivable. 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 embodiment is used as a countermeasure for thinning. 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.

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 beam 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 (5)

A weft insertion pick provided with a warp control device (22) for controlling the travel of the warp (2) by driving the warp travel members (3, 13) according to a speed command generated during the weaving operation, and updated during the weaving operation In the loom (1), which switches two or more elements among the fabric structure, the weft thread type, and the weft driving density as elements related to the weft binding force of the woven fabric (8) by different numbers,
In the warp control device (22), a correction amount for the speed command signal is set in advance corresponding to the switching of the two or more elements,
When the two or more elements are switched together during the weaving operation and the weft binding force changes, the warp control device (22) outputs the speed command according to the set correction amount. A weft density unevenness prevention method for a loom characterized by temporarily correcting the weft density unevenness caused by switching of the above elements in a direction to eliminate the weft density unevenness. The unevenness of the weft density of the loom according to claim 1, wherein the temporary correction is started in a range before and after a dozen picks after the start of the switching and before a dozen picks after the end of the change. Prevention method. The warp control device (22) generates the speed command based on a base speed with the rotational speed of the main shaft (17) as a parameter, and the parameter for the correction amount of the speed command with respect to the base speed. The correction rate is preset, and the warp control device (22) corrects the base speed by generating a speed command based on the calculation result of the correction rate. Item 3. A method for preventing uneven weft density of a loom according to Item 2. The warp control device (22) includes at least one of a winding control unit (24) for driving the clothing roll (13) and a sending control unit (23) for driving the warp beam (3). 4. The method for preventing uneven weft density of a loom according to claim 1, 2, or 3. The loom according to claim 4, wherein the delivery control unit (23) suppresses or invalidates the speed command correction component by control based on a tension deviation with respect to a set target tension in addition to the temporary correction. Weft density unevenness prevention method.

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