JP2530131B2 - Loom feeding device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a device for positively delivering a warp yarn of a loom, and more particularly to a device for freely adjusting the warp yarn tension in the electrical field.

BACKGROUND ART A feeding device of a loom winds a warp thread around a tension roll, and according to a change in the position of the tension roll,
The sending amount is controlled. The warp tension at that time is given exclusively by mechanical means such as a weight applied to a tension roll or an urging spring. Therefore, the target tension of the warp thread can be mechanically set to an arbitrary range by changing the weight of the weight and the elastic coefficient of the spring.

However, such a mechanical adjustment means makes it difficult to perform adjustment while the loom is in operation, and the adjustment is complicated.

On the other hand, Japanese Utility Model Laid-Open No. 59-133687 discloses an electric easing device. However, this technique cannot be used as a tension control system because the control amount is the easing amount, that is, the variable position of the tension roll. Moreover, when the position of the tension roll changes, the tension applied to the warp yarn also changes due to the influence of the mass of the tension roll itself, the change in the bending angle of the warp yarn, etc., which results in stable tension control. Was difficult.

Under such circumstances, a means for adjusting the warp thread tension in the electrical field is desired.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to electrically adjust the tension of a warp thread, that is, the load applied to a tension roll, and to set the adjustment range arbitrarily.

Therefore, the present invention focuses on the fact that the load to be applied to the tension roll is expressed by a linear equation, that is, the equation of y = ax + b, and changes the proportional term from the displacement of the tension roll. The general tension is given by a constant term. Here, both the coefficient a and the constant b in the formula are given in a state that they can be adjusted by the variable type setter, so that the target tension of the warp yarn can be electrically adjusted over a wide range even during the operation of the loom. Can be set to.

Configuration of the Invention FIG. 1 shows an example in which the delivery device 1 of the loom of the present invention is applied to the delivery of pile warp yarn 2.

Many pile warp yarns 2 are wound around the outer periphery of the pile beam 3 in a sheet shape, and are positively fed by the rotation of the feed motor 4, and are wound around the outer periphery of the guide roll 5 and the displaceable tension roll 6 at fixed positions. After being wrapped, it is sent out in the direction of the cloth fell 7. The tension roll 6 is rotatably supported by one end of a support arm 8. The support arm 8 is swingably supported by a fulcrum shaft 9 at a fixed position at the base end portion. The fulcrum shaft 9 is mechanically connected to a drive source 11 such as a servomotor or a rotary actuator. The drive source 11 intermittently generates a torque as a force proportional to the input current, and constantly applies the torque to the fulcrum shaft 9.

The delivery motor 4 is a delivery motor driving device.
It is under the control of 12. The feed-out motor driving device 12 detects the displacement of the support arm 8 by the position detector 13 to drive the feed-out motor 4 in the feed-out direction so that the support arm 8 is always held at a predetermined position, The warp yarns 2 are sequentially sent out in the direction of the cloth fell 7 as weaving proceeds. As is apparent, the feed motor driving device 12 is a position control system for the tension rolls 6, and usually responds with a large time constant. Therefore, when the loom is opened during one rotation, or when piles are formed during one repetitive pattern. Temporary fluctuation of the tension of the pile warp yarn 2 at the time is not controlled.

On the other hand, the drive source 11 is driven by a drive control unit 16 controlled by a tension setting unit 14, which is a main part of the present invention. The output end of the tension setting unit 14 is the drive control unit.
Connected to 16 inputs.

Next, the tension setting unit 14 includes a position detector 18 for indirectly measuring the position of the tension roll 6 from the position of the support arm 8 and a tension setter for setting the coefficient a of the tension change connected thereto. 19 and a tension setter 20 for setting a constant b corresponding to the basic tension. These tension setters 19 and 20 are, for example, both variable resistors, and the addition point 21 is It is connected to the addition point 33 in the drive control unit 16 via.

The addition point 33 of the drive control unit 16 is connected to the drive source 11 via a current amplifier 34. The output current of the DC amplifier 34 is detected by the current detector 35,
It is returned to the addition point 33 as a feedback amount.

Action of the Invention As the weaving operation progresses during the operation of the loom, the cloth fell 7 sequentially moves, so that the tension of the pile warp yarn 2 is gradually increased, and the support arm 8 rotates counterclockwise accordingly. The displacement of the support arm 8 is converted into an electrical signal proportional to the displacement by the position detector 13 and becomes an input signal of the feed motor driving device 12. Therefore, the feed motor driving device 12 determines the position of the tension roll 6, drives the feed motor 4, and feeds out the pile warp yarn 2, thereby sequentially feeding out the pile warp yarn 2 while following the cloth fell 7. .

Meanwhile, during this time, the tension setting unit 14 outputs the target tension signal T to the drive control unit 16. This target tension signal T
Is given by the tension setting units 19 and 20, and is represented by the equation T = aS + b. Here, the “coefficient a” corresponds to the slope of the straight line expression, is a ratio by which the tension setting device 19 divides the output S of the position detector 18, and is an adjustable amount. The “constant b” can be freely set in advance by the tension setter 20. And this relational expression is a general straight line expression "y = ax
+ B ”, the target tension signal T can be set to an arbitrary inclination and an arbitrary height by changing the coefficient a and the constant b as shown in FIG. . Therefore, the relationship between the displacement of the tension roll 6 and the load applied to the tension roll 6 correspondingly, that is, the load application form is the coefficient a and the constant b.
By adjusting, you can freely change and set. The drive control unit 16 receives the target tension signal T as an input, changes the current as the drive output of the drive source 11 such as a motor, and continuously applies the required torque to the fulcrum shaft 9 to generate the torque. Is always applied to the tension roll 6 via the support arm 8 as a reaction force of the target tension, and the tension of the pile warp yarn 2 is set to the target tension.

In the above embodiment, the coefficient a has been described as a positive value. However, this may be a negative coefficient a by adding the addition point 21 with a minus sign if necessary.

As an application example, the target tension signal T
Can be set.

Now, considering the force acting on the support arm 8 in the vertical direction with the target tension signal T = b (constant), the weight of the tension roll 6 greatly influences as the tension roll 6 moves upward. The vertical force of the support arm gradually increases. On the other hand, since the bending angle of the warp yarn 2 by the tension roll 6 increases as the tension roll 6 moves upward, in order to keep the warp yarn tension constant, the component of the tension in the vertical direction of the support arm should be gradually reduced. is necessary.

As is clear from the above, even when a constant torque is applied to the tension roll 6, the warp yarn tension changes when the position of the tension roll 6 changes.

Here, since the displacement amount of the tension roll 6 is small with respect to the length of the support arm 8, it is considered that the increase or decrease in the tension of the warp yarn 2 with respect to this displacement amount is approximately represented by a linear sine function, and the target In the tension signal T = aS + b (S is a linear sine function), by setting the coefficient a to an appropriate value, “aS” becomes a correction term and warp thread tension is changed even if the position of the tension roll 6 changes. It can be kept almost constant.

Modified Example of the Invention The feeding device 1 of the present invention can also be used for feeding the warp yarn of a normal loom. Further, in the above-described embodiment, the tension roll 6 is rotatably supported by the support arm 8, but this support form may be one that moves linearly in parallel with the warp yarn feeding direction, In this case, a DC solenoid or the like may be used as the drive source 11.

Further, in the above embodiment, the tension setting device 19 divides the output S of the position detector 18, but the output S may be amplified by a predetermined magnification if necessary.

EFFECTS OF THE INVENTION In the present invention, the reaction force (load) applied to the tension roll is given as a linear equation, and their coefficients and constants can be freely adjusted. Therefore, in addition to the basic tension of the warp yarn, The tension part proportional to the displacement can be freely set in a wide range. Therefore, in proportion to the conventional mechanical load applying means, the form of applying the load can be electrically changed and set easily. Further, since the coefficient and the constant can be adjusted while observing the state of the loom to be woven during the operation of the loom, the optimum applying form for the woven fabric can be easily set.

[Brief description of drawings]

FIG. 1 is a block diagram of a loom feeding device of the present invention,
FIG. 2 is a graph of tension setting. 1 ... Loom feeding device, 2 ... Pile warp thread, 4 ...
… Sending motor, 6 …… tension roll, 7 …… texture, 8 …… support arm, 9 …… fulcrum shaft, 11 …… drive source, 12 …… sending motor drive device, 14 …… tension setting section, 16 ...... Drive controller, 18 ...... Position detector, 19, 20 ......
Tension setting device.

Claims (1)

(57) [Claims] 1. A method in which a warp yarn from a delivery beam is wound around a displaceable tension roll and a load in the displacement direction is applied to the tension roll to balance the tension of the warp yarn and the load on the tension roll.
In the delivery device of the loom that rotates the delivery beam in the delivery direction, the means for applying a load to the tension roll is a position detector that detects the displacement of the tension roll, and a tension whose proportionality coefficient is adjustable. A tension setting that includes a setting device, calculates a signal proportional to the displacement from the detected displacement and the proportional coefficient, and adds the signal to an adjustable signal set corresponding to the basic tension to output. Department,
It is characterized by comprising a drive control unit that outputs a drive signal corresponding to an output signal from the tension setting unit, and a drive reduction unit that is connected to the tension roll and that applies a force in the displacement direction to the tension roll based on the drive signal. And a loom feeding device.