JPH06104937B2 - Method of controlling roving winding tension of roving machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to control of a roving yarn winding tension of a roving machine, and particularly to a method of setting reference values of various roving yarn tensions used in the control.

[Conventional technology and its problems]

In the bobbin reed type roving machine, the roving yarn sent from the front roller at a constant speed is twisted by the difference in rotation between the flyer rotating at a constant speed and the bobbin rotating at a higher speed. While being wound on the bobbin, the winding condition of the roving is influenced by the tension state of the roving running while being twisted between the front roller and the flyer top. That is, when the roving yarn is moderately loose, the roving yarn is wound onto the bobbin well, but when the tension of the roving yarn varies, the weight of the wound roving yarn varies. Occurs, which causes unevenness of yarn. On the other hand, as is well known, there is also one in which a pair of cone drums are used to adjust the rotation speed of the bobbin to adjust the tension of the roving yarn. However, since the number of layers of roving wound on the bobbin and the rate of increase in the diameter of the sino winding vary depending on the spinning conditions such as the type of spun fiber, the speed of rotation of the flyer, the number of twists, etc. In the method using a drum, it is difficult to adjust the roving machine so that the winding tension is constant from the beginning of winding to the full tube under all spinning conditions.

Therefore, various proposals have been made to keep the tension of the roving yarn constant. For example, in Japanese Patent Laid-Open No. 60-34628, attention is paid to the fact that the posture of the roving yarn changes during spinning depending on the tension state of the roving yarn. A sensor for detecting the position of the roving yarn is provided, the average position of the roving yarn during spinning is calculated, and the belt wound around the cone drum is shifted so as to correct the deviation between this and the preset reference value. A method has been proposed in which the rotation speed of the bobbin is adjusted to control the winding tension. However, this method has a drawback in that the accuracy of roving yarn position detection is poor because a fixed reference value is set uniformly for all the sensors, ignoring the mounting positions of the sensors that inevitably vary.

[Means for solving problems]

The present invention aims to solve the above-mentioned problems of the prior art, and performs the reference value setting of the roving thread tension that depends on the intuition and experience of the operator such as visual observation and feel in a clear procedure. It is intended to eliminate the error caused by individual differences.

That is, the present invention includes a speed change mechanism for changing the rotation speed of the bobbin, and a non-contact type sensor that can continuously detect the position of the roving yarn between the front rollers and the flyer top of the selected multiple weights is provided. The tension state of the roving yarn is calculated based on the output signals from the respective sensors, and the value is compared with a preset reference value to judge whether the tension state of the roving yarn is proper or not. If not, in a roving machine equipped with a microcomputer that outputs a signal for changing the rotation speed of the bobbin, when setting the reference roving position of each of the weights, first, the position P ′ in the tensioned state of the roving is detected, and then, A method for controlling the roving winding tension of a roving machine is characterized in that a position P deviated by a predetermined value from the position is set as a reference position and is stored in the microcomputer.

〔Example〕

The present invention will be described in more detail based on the embodiments shown in the drawings. As shown in FIG. 1, in the roving machine, the front roller 1, the flyer 2 and the top cone drum 3 have a common main motor 4
Driven by rotation transmission means (shown by a thick solid line) such as a gear train and a timing belt, and causes the bobbin 5 to rotate from the main motor 4 and the top cone drum 3
The rotation from the bottom cone drum 7 which is rotated at a variable speed via the belt 6 is combined and transmitted by the differential mechanism 8.

A long rack 10 to which a belt shifter 9 for moving the belt 6 is fixed is arranged at a position where it meshes with a pinion 13 fitted to an upright shaft 12 so as to be capable of reciprocating in the lateral direction. The upright shaft 12 is moved left and right by a rack feed motor 22 via gears 20 and 21. The rotation of the rack feed motor 22 is detected by the sensor 23. When a signal is given to the feed motor 22 when switching the bobbin rail 14 up and down, the motor 22 rotates the pinion 13 by a constant amount to move the long rack 10 leftward in FIG. 1 at a constant pitch. Has been done.

A non-contact type sensor 26 for continuously detecting the position of the roving R between the front roller 1 and the flyer top 2a is provided for a plurality of selected weights, and as shown in FIG. 27 and a light receiving portion 28, and the roving R is located between them. The light emitting section 27 is composed of a row of infrared light emitting diodes 27a arranged in a staggered manner, and the light receiving section 28 is composed of a row of light receiving elements 28a facing the infrared light emitting diodes 27a. Light emitting part 2
7. It is desirable that both the light receiving portion 28 and the light receiving portion 28 are fitted in the inner part of the hole formed in the mounting body 29 as shown in FIG.
This prevents the light from diffusing and enables more reliable roving detection. When each light receiving element receives light, it outputs an electric signal and inputs it to the microcomputer M. Since the light receiving element 28a corresponding to the position of the roving R does not receive the light because the roving R blocks the light from the light emitting section 27, the position of the roving R can be obtained by detecting this light receiving element. it can.

Here, inevitably some errors in the mounting of the sensor 26 is inevitable, even at the same roving position, to the position at the sensor 26 _{and second} sensor 26 ₁ and the other of the weight of a certain weight The position of the corresponding light receiving element may be different. In the conventional technology, since the signals from the elements in the corresponding positional relationship are regarded as the same for each sensor, ignoring the error peculiar to each sensor, based on the detection signal from each sensor. When the processing is performed by the microcomputer M, the result may be incorrect.

Therefore, in the present invention, the roving yarn being spun is first put in the most tense state (shown by a dotted line) which coincides with the straight line connecting the nip point of the front roller 11 and the flyer top 2a as shown in FIG. In this state, the roving yarn position P ′ detected by each sensor is input to the microcomputer M. Next, a constant difference d corresponding to a slightly loosened state (shown by a solid line) in which the roving yarn is in the proper tension state is added to the roving yarn position P ', and this is set to the proper roving yarn position in each sensor. It is stored in the microcomputer M as the reference value shown.

Data sampling for determining the tension state of the roving R is performed according to a preset program when the rotation of the bottom cone drum 7 reaches a stable state after the bobbin rail 14 is switched up and down, and the coarse sampling from each sensor is performed. The average value of the difference between the yarn position detection signal and the reference value of each sensor is automatically calculated by the microcomputer M, and a signal is output to the rack feed motor 22 in order to obtain a bobbin rotation speed that eliminates this difference. As a result, the motor 22 rotates in a predetermined direction by a predetermined amount to move the belt shifter 9 fixed to the long rack 10. That is, when the detected roving yarn position is lower than the reference value, it means that the tension is too loose. Therefore, the belt shifter 9 moves in the direction of increasing the bobbin rotation speed, and conversely the roving yarn position is lower than the reference value. If it is too high, it means that the tension is too high, so the bobbin rotation speed is reduced.

This amount of movement is detected by the sensor 24, and when it is confirmed that a predetermined movement has been made, the rack feed motor 22 stops. It should be noted here that the control of the rack feed motor 22 by the sensor 26 is performed at a different timing from the change of the bobbin rotation speed due to the increase of the diameter of the Shino winding which is regularly performed. .

FIG. 5 is a block diagram showing the above description. In the figure, the setting switch 30 is a switch that is turned on / off according to the timing of data sampling, and the slack amount setting switch 31 is a setting device for adding the above-mentioned constant value.

〔The invention's effect〕

As described above, according to the present invention, the position of the roving yarn during spinning is detected by each sensor installed between the front rollers and the flyer top of the plurality of weights of the roving spinning machine, and the roving position is fed back. In the force control method, when setting the reference roving thread position, the position of the roving thread in the tension state is stored in the microcomputer for each sensor, and then a value obtained by adding a certain value to the position is calculated. Then
Since this is used as the reference value for each sensor, it is possible to perform control with higher accuracy than when a uniform reference value was set for each sensor despite the mounting error as in the past. Become. Even if it is necessary to change the reference value by changing the spinning condition, once the roving position in the tensioned state is stored as described above, it is only necessary to add a predetermined correction value according to the condition. It can be carried out easily and work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a drive system of a roving machine to which the present invention is applied, FIG. 2 is a front view of an example of a roving position detecting sensor, and FIG. 3 is a line II-II of the sensor of FIG. Fig. 4 is a model diagram of the position of the roving yarn, and Fig. 5 is a block diagram of the method of the present invention. 1 …… Front roller 2 …… Flyer 3 …… Top cone drum 4 …… Main motor 5 …… Bobbin or Shino winding 6 …… Belt 7 …… Bottom cone drum 9 …… Belt shifter 10 …… Long rack 12 …… Up Light shaft 22 …… Rack feed motor 26 …… Sensor 27 …… Light emitting part 28 …… Light receiving part 30 …… Setting switch 31 …… Slack amount setting switch M …… Microcomputer R …… Rough thread

Claims (1)

[Claims] 1. A non-contact type sensor provided with a speed change mechanism for changing the rotation speed of a bobbin and capable of continuously detecting a roving position between a front roller and a flyer top of a plurality of selected weights. The tension state of the roving yarn is calculated based on the output signals from the respective sensors, and the value is compared with a preset reference value to judge whether the tension state of the roving yarn is proper or not. In a roving machine equipped with a microcomputer that outputs a signal for changing the rotation speed of the bobbin if it is not appropriate, when setting the reference roving position of each of the weights, first, the position P'in the tensioned state of the roving is detected, Then, a position P deviated from the position by a predetermined value is set as a reference position, and is stored in the microcomputer, so that the roving winding tension of the roving frame is controlled.