JP3377737B2 - Pile warp tension control method for pile loom - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for controlling the tension of pile warps in a pile loom according to the weave design. In this specification, the direction from the feeding device of the loom to the winding device is referred to as "forward", and the opposite direction is referred to as "backward". In addition, "Fastpick" is a beating
At the same time, it is said that the weft thread is beaten completely up to the weave, and "Lose pick" is used for beating.
In the above, we say that wefts are beaten halfway up to the weave and not completely beaten up to the weave.

[0002]

2. Description of the Related Art Japanese Patent No. 2622685 discloses a method and apparatus for controlling the tension of pile warps in a cloth moving type pile loom. FIG. 1 shows a pile warp tension adjusting device 1 disclosed by the above-mentioned patent, and FIG. 2 shows an example of a pile design, which is a weaving cycle using three weft towels (3 pick piles) as one weaving cycle. In connection with this, the formation of piles in the pile weaving process is shown.

In FIG. 1, a pile warp tension adjusting device 1 is shown.
Sends the pile warp yarn 2 to the cloth fell 4a of the pile fabric 4 with a target tension. The pile warp 2 is a pile warp beam 6
The pile fabric 4 is sent out from the fabric, passes through the guide roller 7 and the tension roll 8, and reaches the cloth cloth 4a (weave end) of the pile fabric 4. The tension roll 8 is rotatably supported by one end of a tension lever 9 serving as a supporting unit, and the other end of the tension lever 9 serves as a rotational drive source and is a motor capable of torque control, speed control, and stop position control. It is fixed to 10 output shafts.

In the cloth moving type pile loom, the pile fabric 4
Moves in the front-back direction during the pile weaving process. Along with this, the tension roll 8 is displaced in the front-rear direction by the rotation of the tension lever 9, and allows the pile warp yarn 2 to move in the front-rear direction. Although not shown, the pile loom includes a ground warp beam, a tension control device for the ground warp 3, a winding control device for the pile fabric 4, a warp shedding device, a terry motion device for cloth movement, and the like.

In the process of weaving, the pile warp yarns 2 are sent out by the warp beam driving device 11. That is, the warp beam driving device 11 receives the displacement signal of the tension roll 8 detected by the displacement sensor 12 and the target displacement signal given by the setting device 13 as an input, and uses the speed calculator 14 to detect a speed signal corresponding to the deviation between them. Is generated, and the motor 16 for sending out is generated via the current amplifier 15.
Is driven in the feeding direction of the pile warp yarn 2 .

The motor 10 as the rotation driving source of the tension lever 9 is provided with a pile warp tension control device 2
Controlled by 0. The pile warp tension control device 20
In order to generate a predetermined torque for the motor 10,
Tension command unit 17 for generating a tension signal, speed command unit 18 for driving the motor 10 at a predetermined speed, and stop position signal for stopping the motor 10 at a predetermined stop position The stop position command unit 19 is provided, and those signals are selectively sent to the drive unit 22 by the switcher 21.

The switching device 21 is a stop position during a weaving switching process in which a speed signal is obtained during a fast pick, a tension signal is released during a loose pick, and a transition is made from a fast pick to a loose pick or from a loose pick to a fast pick during the pile weaving process. Signals are respectively sent to the drive unit 22, and a tension signal is sent to the drive unit 22 in the process of border weaving, hem or the like. Therefore, the drive unit 22
The speed control, the tension (torque) control, and the stop position control are executed in the first pick, loose pick, or the switching process of weaving thereof.

Here, the tension of the pile warp yarn 2 is set to be low during pile weaving (loose pick), and is set to be higher during ground weaving (first pick) described later than during pile weaving. There is. The ground weave is a generic name for woven portions excluding pile weave, and specifically includes border weave, hem weave, and the like.

Next, FIG. 2 shows an example of pile structure 3
The process of forming a pile by pile weaving of the weft towel will be described with respect to the number of rotations of the loom, the rotation section of the loom, the control mode, the pile warp
It is shown in correspondence with the magnitude of the tension. 1 weave cycle (1 repetition) of the organization because it is a 3 weft towel
Is performed every three picks, that is, every three revolutions of the loom (spindle). Further, since the pile loom is a cloth moving type loom , the beating point is always constant, but one pile fabric 4 is one weave.
By moving the pile in the front-rear direction, a pile having a required length is formed between the beating point and the cloth fell 4a of the pile fabric 4.

In FIG. 2, the state (1) corresponds to the completion of pile formation, the states (2), (3) and (4) are loose picks, which correspond to the forward movement of the cloth fell 4a. (5),
The state (6) is the first pick, which corresponds to the backward movement of the cloth fell 4a. Then, the rotation sections R1, R2 of the loom,
R3 corresponds to the first rotation of the loom, the second half of the third rotation, and the second half of the third rotation.

In the state of (1), that is, after the pile formation is completed,
In the rotation section R1 of the loom, the pile warp tension control device 20
Performs speed control V, drives the motor 10 with a current corresponding to the speed signal, advances the tension lever 9 and moves the tension roll 8 into the cloth cloth 4 as seen in (2).
It is displaced to a position corresponding to the amount of forward movement of a. As a result, the tension lever 9 moves prior to the forward movement of the cloth fell 4a, so that the pile warp yarn 2 is temporarily loosened. As a result, the tension of the pile warp yarn 2 is set to a low value so that the pile will not come off.

After that, the pile warp tension control device 20
The stop position control B is entered, the driving of the motor 10 is stopped by the stop position signal, and the tension lever 9 is stopped at a predetermined position. By the subsequent advancement of the pile fabric 4,
The tension of the pile warp yarn 2 finally changes from a low value to a target set value. By this stop position control B, the tension roll 8 does not move forward more than necessary, so the movement of the tension lever 9 in the forward direction is immediately set to a stable stop state.

During this time, the opening frame 23 brings the pile warp yarn 2 and the ground warp yarn 3 into an open state. In the open state, a weft inserting device (not shown) inserts the weft 5 having the reference numeral 1 into the opening . The weft yarn 5 that has been weft- inserted is driven by the reed 24 in a loose pick state at the repulsion point.

Next, in the rotation section R2 of the loom, (3),
As seen in (4) and (5), the pile fabric 4 is retracted by the operation of the terry motion device. During this period, the pile warp tension control device 20 executes the tension control T, drives the motor 10 with a current corresponding to the target tension signal, and rotates the tension lever 9 in the backward direction to adjust the torque of the motor 10. By setting the tension of the pile warp yarn 2 in a balanced state, the tension of the pile warp yarn 2 is set to a set value. During this period, two wefts 5 and 3 are inserted.

Next, in the rotation section R3 of the loom, the pile warp tension controller 20 performs the stop position control B (6).
As can be seen from the above, the braking force is applied to the motor 10 to stop the retraction of the tension roll 8. (2), (3)
After the two wefts 5 have been inserted in the loose pick state of (5), the first pick state of (5)
in a state in which a is retracted to beating point, the weft yarn 5 of the code 3 is weft insertion is beaten by the reed 24, pile warp 2 held by the weft yarns 5 of the two is the reed escape amount ( A predetermined loop or pile is formed according to the amount of advance of the cloth fell 4a with respect to the beating point.

Thus, in the process of pile weaving,
During the three revolutions of the loom, the three weft yarns 5 are inserted, and the pile warp yarns 2 form one pile during this. In pile weaving (first pick), the pile warp tension by the tension control T is set low.
On the other hand, with respect to the weave design, when the pile weave is switched to the plain weave without forming the pile after a predetermined number of picks, the pile warp tension controller 20 continuously beats the bead in a so-called first pick state. The tension control T is executed and the tension of the pile warp yarn 2 is maintained at a desired warp tension.

On the other hand, a general technique, for example, actual Kaihei 2-74
No. 386, etc., sets the tension of pile warp yarns corresponding to the border weave portion and the pile weave portion, changes the target tension of the pile warp yarn in response to the change of the weave portion, and controls the pile under tension control. It discloses performing a weave. Specifically, in the above technique, the set warp tension is set to a low tension value during pile weaving, and is set to a high tension value during border weaving compared to the pile weaving portion. As described above, since the weft driving density is high in the border weave portion, the tension is increased in order to improve the driveability, and conversely, the tension is lowered in the pile weaving portion for pile formation.

[0018]

According to the prior art, since the texture of the ground weave is higher than that of the pile weave, the weave front (weave) returns to the warp beam side after beating, that is, the so-called weaving return. Occurs. Therefore, even if the pile warp tension is changed from a high tension to a low tension in response to the change of the weaving portion from the plain weave to the pile weave, the reed escape amount is insufficient by the amount of return of the above-mentioned weave, and thereafter, There is a problem that the pile height becomes low during pile formation, and further, pile pull-out occurs, so that the quality of the pile fabric is deteriorated.

Therefore, an object of the present invention is to prevent the pile loss that occurs during pile formation in the process of switching from plain weave such as border weave and hem weave to pile weave in a pile loom.

[0020]

According to the present invention, the pile warp tension is made lower than the tension set at the time of steady pile weaving in response to the switching from the ground weave to the pile weave. . Further, according to the present invention, the displacement amount of the tension roll, which is driven in synchronization with the cloth movement in the first pick at the time of pile formation, corresponding to the switching from the ground weave to the pile weave, is changed once during the normal operation. It is designed to drive with a larger amount than.

Specifically, the pile warp tension control method for a pile loom according to a first aspect of the present invention relates to one pile weaving cycle.
The tension control process is included in the
Set in the pile warp tension controller of the pile loom to adjust the pile warp tension, which as the set tension, a tension corresponding to the pile weaving corresponding to weaving the ground in accordance with the set tension of the pile warp which is set to correspond to the A first tension lower than the tension is set and is lower than the first tension.
Set the second of tension lower is, Saishi to change to the pile weaving from the weaving land, when switched to the pile weaving from the weaving earth
In the first period, which includes one or more weave cycles after the point ,
After the set tension is the second tension and the first period has elapsed
In addition, the set tension of the pile warp is the first tension . The pile warp tension control method for a pile loom according to claim 1, wherein the set tension of the pile warp is set to the second tension after the first period.
Together is gradually increased toward the first tension from said second tension in the period, the second is after the second time period 1
The tension is set to.

In the pile warp tension control method for a pile loom according to a third aspect of the present invention, the tension roll is supported by the supporting means in a state of being displaceable in the front-rear direction, the pile warp is wound around the tension roll, and the front and rear of the tension roll are wound. A pile warp tension control method for adjusting the tension of a pile warp by a displacement in a direction, in which a tension roll is forcibly displaced in a relaxation direction of the pile warp tension at a speed corresponding to a preset first displacement amount. Position control process of the roll, tension control process of applying a torque corresponding to the preset tension to the tension roll about its rotation center, and stop for holding the tension roll in a stopped state at a predetermined position at a predetermined time It consists of the position process, and corresponds to pile weaving, the position control process at the first pick and the loose pick Performs the tension control process based on the set tension corresponding to pile weaving, the stop position process when shifting from the first pick to the loose pick or from the loose pick to the first pick, and the corresponding setting corresponding to the ground weaving. In a pile warp tension control method for a pile loom that executes a tension control process based on tension, the displacement amount of the tension roll in the position control process is changed from the plain weave to the pile weave in response to the change from the plain weave to the pile weave. First after switching to
During the period, the second displacement amount is set to be larger than the first displacement amount. The pile warp tension control method for a pile loom according to claim 4, wherein the displacement amount of the tension roll is changed from the second displacement amount to the first displacement amount in a second period after the lapse of the first period. And gradually decrease,
After the lapse of the second period, the first displacement amount is set.

[0023]

Embodiment 1 This embodiment corresponds to claims 1 and 2 and adopts the same structure as that of FIG.
In addition, as for pile formation during pile weaving, three weft towels (3 pick piles) are used in one weaving cycle as in FIG.
And weaving .

FIG. 3 shows a concrete structure of the tension command section 17. The tension command section 17 is composed of a plurality of tension signal generators 25 and one selection signal generator 26. First, second, ... Nth tension signal generator 2
5 is provided for each weaving structure for switching the weaving structure, and stores a predetermined tension pattern together with the rotation angle of the main shaft 27 of the loom for each weaving structure such as pile weave, border weave, and hem weave. There is.

The rotation angle of the main shaft 27 is detected by a timing signal generator 30 including a dog 28 and a proximity switch 29 connected to the main shaft 27, and is sent to each tension signal generator 25 as a timing signal. Therefore, each tension signal generator 25 can output a tension signal based on a predetermined tension pattern according to the timing signal.

Further, the selection signal generator 26 outputs a selection signal in response to the step signal from the step signal generator 31 to drive the relay 32, and outputs the tension signal generator 25 to the output side. By selectively setting the provided switch 33 to the ON state, only one tension signal is output to the drive unit 22. The step signal generator 31 detects the rotation angle of the dog 34 connected to the main shaft 27 by the two proximity switches 35 and 36, and outputs it as a step signal.

The driving unit 22 includes one tension signal generator 25.
The current amplifier 38 drives the motor 10 based on the tension signal input from the motor. The output current of the current amplifier 38 is detected by the current sensor 39,
Is added as a negative signal to the addition point 37 on the input side of. In this way, the drive unit 22 detects the current of the motor 10 and generates the torque corresponding to the set tension signal via the motor 10.

In response to the weft inserting step, the operator operates the plurality of tension signal generators 2 in accordance with the instruction of the weave structure.
5 selection signals are preset. During weaving, the selection signal generator 26 outputs a predetermined selection signal corresponding to the weft inserting step, and sets one of the plurality of switching devices 33 to the ON state to generate one tension signal. The tension signal as the output of the container 25 is sent to the drive unit 22. In general,
The pile loom includes an opening controller (electrically instructing an electronic dobby, an electronic jacquard, and the like to vertically move the heddle) attached to the opening device, and the selection signal generator 26 also serves as the opening controller.

First, when the border weaving, which is one of the ground weaves, is performed, the switching device 21 switches to continuous tension control T, and the tension command section 17 causes the selection signal generator at the time of entering the border weaving. A selection signal corresponding to the switching of the weave is generated from 26, and is switched to the tension signal generator 25 corresponding to the border weaving through the switch 33. A tension pattern is set in advance in the tension signal generator 25 selected at this time, and based on this, a tension command value which is a set tension corresponding to the input pick is output.

After that, when the weave design is changed from the border weave to the pile weave, the control corresponding to the pile weave is executed in response to the movement of the pile weave 4 (woven fabric). Specifically, in response to this, the speed command unit 18, the tension command unit 17, and the stop position command unit 19 are sequentially selected via the switch 21, and more specifically, in response to the movement of the woven fabric. , The speed control V corresponding to the first displacement amount at the time of the first pick
After that, stop position control B is performed at the time of transition from the first pick to the loose pick, tension control T corresponding to the first tension is then performed at the time of the loose pick, and stop position control B is again performed at the time of transition from the loose pick to the first pick. Each is executed to form one pile. Thereafter, in pile weaving, a series of these operations are sequentially repeated to form a pile.

In the above-mentioned ground weave, appropriate values are set according to the types of the ground weave such as the hem weave. However, in the plain weave, since the wefts 5 are woven with a higher driving density than in the pile weaving, the phenomenon that the weft density becomes normal after being beaten several times, that is, the so-called weft (4a)
Retreat occurs. Therefore, when the ground weave is changed to the pile weave thereafter, the above-described series of control is executed. However, the reed required for forming the loose pick by the amount of the receding of the cloth fell (the weave 4a) at the time of the ground weave. The escape amount is insufficient and so-called pile omission occurs.

Therefore, in the present invention, when the weave design is changed from the border weave to the pile weave, the tension command section 17 sets the pile warp set tension from the plain weave to the tension control T corresponding to the loose pick. In the first period after switching to the weave, the second tension is set to be smaller than the first tension. More preferably, the pile warp yarn setting tension is gradually increased from the second tension toward the first tension during the period from the lapse of the first period to the second period, and the second period is further increased. After the lapse of time, the first tension is set. According to this, when the weave structure is changed from the border weave to the pile weave, the tension roll 8
The pile warp tension applied via the thread is reduced to the second tension, and the position of the weft (loose cloth 4a) during loose pick beating moves to the position during normal pile weaving, causing the above-mentioned lack of reed escape. It is resolved, so-called pile omission is resolved.

FIG. 4 shows an example of setting a pile warp tension setting pattern (torque pattern) when changing from plain weave to pile weave. In the process of ground weaving, the tension of the pile warp yarn 2 is set to an appropriate value depending on the type of ground weaving such as the first border weave, the second border weave, and the hem weave. After that, the set tension of the pile warp yarn 2 is set to the second tension lower than the first tension at the pile weaving from the time of entering the pile weaving to the lapse of the first period. In the period from the lapse of the period of to the second period, the second tension is gradually increased toward the first tension, and after the second period is passed,
The tension is set to the first tension, the torque of the motor 10 is reduced through the tension command section 17, and thereafter, the torque is gradually increased toward the pile warp tension during pile weaving. In practice, it is set so as to gradually increase toward the set tension during pile weaving from several picks to ten or more picks.

The second tension, which is the minimum tension value during pile weaving, and the first period and the second period, which are the changed sections, differ depending on the weaving conditions of the previous ground weave and the pile weaving this time. .., nth tension signal generators, respectively. In this case, the set parameters are the set tension for ground weaving and the first tension for pile weaving.
And the second set tension, the number of weft insertion picks in the first period, the number of weft insertion picks in the second period, and the degree of change in the set tension with respect to the changed section after the pile weave, which is the changed section, is changed. There are gradients, etc., and a tension pattern (torque pattern) is created and set based on these. It should be noted that all the setting parameters are appropriately set so as to eliminate the pile omission. This pattern setting may be created by automatic calculation or may be a setting obtained from experience. In practice, the tension of the pile warp yarn 2 during pile weaving is set between several picks and ten or more picks of one weaving cycle or more, and the desired pile weave tension is obtained after the texture of the peripheral portion of the weaving change is stabilized. . It is desirable not to change the set tension during loose pick weaving during one weaving cycle, that is, in the torque control region, and the target pile weaving tension is obtained after the texture of the peripheral portion of the weave switching is stabilized.

The form of the setting pattern is not limited, and it is not stepwise, and may be continuously set by a straight line, a curved line, or a complex curve as shown by a dotted line in FIG. Also after the application of the second tension which is the peak tension, the cash example for gradually increasing the tension toward the tension of the target, instantaneously applying a second tension, even when the first pile fabric tension immediately Good.

Generally, in the border weaving, a plurality of types of border weaving (first border, second border, ...
The tension signal generator 25 is provided corresponding to the switching of the weave structure, and the tension pattern is also set corresponding to each of them. Of course, even when a plurality of types of pile weave are performed, the same setting is performed corresponding to the combination of the pile weave and the ground weave.

The internal structure of the tension command unit 17 is not limited to the above specific example. Although the thing of FIG. 3 is controlled corresponding to the weft insertion pick, the weft insertion pick may be replaced by the elapsed time after the change of the weave design. Further, the tension signal generator 25 may be composed of only a single tension signal generator. Further, the tension signal generator 25 may be composed of a tension setting device in a steady state and a differential signal generator that generates a differential signal corresponding to the weft insertion pick. In this case, the magnitude of the differential signal is appropriately determined so that the pile omission does not occur. The above-described embodiment is not limited to the configuration of the pile warp tension adjusting device 1, but can be applied to other devices. For example, it can be applied to a configuration in which the pile warp tension is controlled by rotating the warp beam.

[0038]

Embodiment 2 This embodiment corresponds to claims 3 and 4, the overall structure is the same as in FIG. 1, and the pile forming process is also the same as in FIG.

This specific example is realized by changing the set tension of tension control T during loose pick during pile weaving, by speed control V during first pick, and the drive speed of tension lever 9 (if integrated, Displacement amount)
The second speed larger than the speed corresponding to the first displacement amount in the steady state
The driving speed is gradually reduced toward the steady driving speed as the speed control V of the next weaving cycle is performed.

More specifically, when the weave structure is changed from the border weave to the pile weave, the displacement amount of the tension lever 9 at the time of the first pick is changed from the plain weave to the speed command unit 18. In the first period after switching to the pile weave, the second displacement amount is set to be larger than the first displacement amount. More preferably, the displacement amount of the tension lever 9 is set to the first displacement amount from the second displacement amount in the second period after the first period has elapsed.
Is gradually decreased toward the displacement amount, and is set to the first displacement amount after the second period has elapsed. This allows
Speed signal generator 4 0 as the driving speed of the tension lever 9, in the first period from the time of entering the pile weaving, at a speed corresponding to the second displacement, after a lapse of the first period the second During the period, the velocity gradually decreases from the velocity corresponding to the second displacement amount toward the velocity corresponding to the first displacement amount, and after the second period has elapsed, the first displacement amount corresponds to Each speed is output, and the motor 10 is speed-controlled at the speed corresponding to this. According to this, when the weave design is changed from the border weave to the pile weave, the displacement amount of the tension roll 8 is increased and the loosen cloth is beaten before weaving (the weave 4a) as in the previous embodiment. Since the position moves to the position at the time of steady pile weaving, the shortage of the reed escape amount described above is eliminated, so that the so-called pile omission is eliminated as in the previous embodiment.

FIG. 5 shows the structure of the speed command unit 18. The speed command unit 18 includes a plurality of speed signal generators 40,
And a selection signal generator 41. 1st, 2nd, ... nth
A plurality of speed signal generators 40 are provided corresponding to the switching of the weave design, and the target displacement amount corresponding to the weft insertion pick is set in advance in each of the speed signal generators 40 by this setting. The pattern of the speed signal at the time of weaving the first pick for pile formation converted by the value and other setting parameters is stored. The weft insertion step signal is input to the selection signal generator 41 as in the above example. Corresponding to weaving switching, speed signal generator 4
By outputting a speed signal of 0, the relay 42 is driven, and only one of the plurality of switchers 43 is set to the ON state.

Each speed signal generator 40 counts the timing signals and outputs a speed signal corresponding to the count value (the number of picks), and the speed calculator 44 via the switch 43.
Send to one input end of. The speed calculator 44 calculates a speed command corresponding to the deviation between the actual speed and the target speed, and outputs it to the drive unit 22. The actual speed of the motor 10 is detected by the output of the tacho generator 45 connected to the motor 10.

FIG. 6 shows an example of setting the displacement pattern (speed command pattern) of the speed control V of the tension lever 9 during the position control process of the first pick when changing the weave design from the plain weave to the pile weave. Note that V, T, and B shown in the drawing correspond to control modes, that is, speed control V, tension control T, and stop position control B, respectively. In the process of changing the weave design from the pile weave to the border weave, in the first period from the time of entering the pile weave, the second displacement amount larger than the first displacement amount at the time of speed control V when the pile weave is performed. In the second period after the lapse of the first period,
It is set so as to gradually decrease from the second displacement amount toward the first displacement amount, and further to become the first displacement amount after the lapse of the second period. As a result, the speed signal generator 4
0 is the speed corresponding to the second displacement amount in the first period from the time when the tension lever 9 enters the pile weave,
In the second period after the lapse of the first period, the speed gradually decreases from the speed corresponding to the second displacement amount to the speed corresponding to the first displacement amount. , And outputs the speed corresponding to the first displacement amount, respectively, and is driven by the control system in the subsequent stage.

Actually, a speed command is set so as to gradually decrease so as to reach the first displacement amount with a few picks. The tension control T at the loose pick time and the stop position control B performed during the transition period from the loose pick to the first pick are performed as usual.

In this way, the amount of displacement of the tension roll 8 is set so as to gradually decrease from the second amount of displacement in each repeating cycle, and finally becomes the first amount of displacement during steady pile weaving. Is set. According to this setting example, the amount of displacement of the tension roll 8 gradually decreases and changes stepwise in each repetition cycle.
It is also possible to set it as a form that continuously decreases with a constant slope in the section. In this setting, weaving conditions for the previous ground weaving, such as warp tension, plain weave, twill weave, satin weave, weave density and weft density, and weaving conditions for pile weaving, such as pile height Set in consideration of the size. Of course, as in the previous embodiment, the first displacement amount may be set immediately without providing the second period.

The structure of the speed command unit 18 is not limited to the above specific example. In the above specific example, the control is performed corresponding to the weft insertion pick, but instead of the weft insertion pick, control may be performed according to the elapsed time after the change of the weave design. The speed command unit 18 can also be configured by a single speed signal generator 40. The speed signal generator 40 may be composed of a steady speed setting device and a differential signal generator that generates a differential signal corresponding to the weft insertion pick. In this case, the magnitude of the differential signal is
Appropriately make sure that the pile does not fall out.

The above-mentioned two embodiments may be implemented individually or in combination of the two. Further, the present invention is not limited to the configuration of the pile warp tension adjusting device 1 and can be applied to other than this. For example, it can be applied to a configuration in which the pile warp tension is controlled by rotating the warp beam. Further, the pile loom is not limited to the cloth moving type, but can be applied to other types of pile loom such as a reed moving type (lead driving, sword driving, etc.). Further, a plurality of tension command units 17 may be provided corresponding to the rotation speed of the loom. By doing so, an appropriate warp tension can be set in accordance with a change in the number of revolutions of the loom, so that it is possible to prevent pile pull-out that occurs due to a change in the optimum tension pattern due to a change in the rotational speed of the loom.

[0048]

According to the present invention, the driving torque of the tension roll is temporarily reduced by loose picking during pile weaving after switching from the plain weave to the pile weaving, or by the first pick during pile weaving after the switching. Since the tension roll is driven with a larger displacement than the steady-state displacement, the reduction in the amount of reed escape due to the retraction of the weave caused by the previous weaving is eliminated immediately after switching the weave design, and the desired amount is eliminated. Since the amount of reed escape can be obtained, the pile can be surely formed without the pile coming off.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a pile warp tension adjusting device and a pile warp tension controlling device.

FIG. 2 is an explanatory diagram of a pile forming process.

FIG. 3 is a block diagram of a tension command section.

FIG. 4 is a graph showing changes in tension of pile warp yarns corresponding to weft insertion steps.

FIG. 5 is a block diagram of a speed command unit.

FIG. 6 is an explanatory diagram of a displacement pattern of a tension roll.

[Explanation of symbols]

1 pile warp tension adjusting device 2 pile warp 3 ground warp 4 pile fabric 5 weft 8 tension rolls 9 Tension lever 17 Tension command section 18 Speed command section 19 Stop position command section 20 pile warp tension control device 21 Switch 22 Drive 25 Tension signal generator 26 Selection signal generator 40 speed signal generator 41 Selection signal generator 44 Speed calculator

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) D03D 49/12 D03D 39/22

Claims (4)

(57) [Claims] 1.Tension control during one pile weaving cycle
Including the control process, this tension control process corresponds to the weave design.
Of pile warp set byPile warp tension according to set tension
Adjust powerOrderThe pile warp tension control device for pile loom
AndAs the set tension, Corresponding to pile weavingIn tension
Lower than the set tension corresponding to the weavingThe first tension is set
Is determined,The second tension lower than this first tension
Force is set, Ground From weavepileTo change to weaveOn the occasion, from the plain weave to the pie
One or more weaving cycles since switching to le weaving
includingIn the first period,The set tensionIs the second tension
ThenAfter the lapse of the first period, the set tension of the pile warp yarn is set to the first value.
The tension of Pile warp of pile loom characterized by
Tension control method. The method according to claim 2 second period after the first period, Pas
The set tension of the pile warp is gradually increased from the second tension to the first tension, and the set tension of the pile warp is set to the first tension after the lapse of the second period. The pile warp tension control method for a pile loom according to claim 1. 3. A pile warp tension for supporting a tension roll by a support means in a state of being displaceable in the front-rear direction, winding a pile warp around the tension roll, and adjusting the tension of the pile warp by the displacement of the tension roll in the front-rear direction. A control method, which is a tension roll position control process of forcibly displacing the tension roll in a relaxation direction of pile warp tension at a speed corresponding to a preset first displacement amount, and a tension roll rotation center. The tension control process of applying a torque corresponding to the set tension set in advance and the stop position process of holding the tension roll in a stopped state at a predetermined position at a predetermined time are performed. Sometimes the position control process is performed, and when loose picking, the tension control process is performed based on the set tension corresponding to the pile weave. , Pile warp for pile loom, which executes stop position process when shifting from first pick to loose pick or from loose pick to first pick, and also executes tension control process based on the set tension corresponding to this during ground weaving In the tension control method, the displacement amount of the tension roll in the position control process corresponds to the change from the ground weave to the pile weave in the first period in the first period after switching from the ground weave to the pile weave.
Is set to a second displacement amount larger than the displacement amount of the pile loom. 4. The displacement amount of the tension roll in the position control process is changed from the second displacement amount to the first displacement amount in the second period after the lapse of the first period. The pile warp tension control method for a pile loom according to claim 3 , wherein the first displacement amount is set after the second period has elapsed while gradually decreasing.