JP3358756B2 - Yarn winding diameter detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn diameter detecting device for a yarn feeder, and more particularly to a yarn feeder for pulling a yarn from a yarn feeder loosely inserted into a textile machine such as a loom or a creel. The present invention relates to an improvement in a technique for detecting a temporal change in a body winding diameter.

[0002] The dimensional relationship between a yarn feeder and a peg on a textile machine such as a loom or a creel may be the case where the outer diameter of the peg matches the inner diameter of the core tube of the yarn feeder. There is. However, in general, they do not often match each other in order to cope with various types of yarn feeders and in view of ease of installation of the yarn feeders. In this case, the yarn feeder is loosely inserted into the peg (that is, the outer diameter of the peg is smaller than the inner diameter of the core tube of the yarn feeder), and the central axis of the peg does not coincide with the central axis of the core tube. The present invention is a technique applied to such a system.

When the yarn is pulled out from the yarn supplying body in such a system, it is necessary to constantly detect a temporal change in the winding diameter of the yarn supplying body in parallel with the yarn drawing, because of various needs such as ballooning management which will be described in detail later. is there.

[Prior art]

As a technique for performing such detection, there is a technique disclosed in Japanese Utility Model Laid-Open No. 67386/1985. This prior art is a photoelectric detection system in which a photoelectric sensor including a plurality of light projecting elements and a light receiving element is arranged in a direction orthogonal to an axis of the yarn feeder with the yarn feeder interposed therebetween. . By using this prior application technology, it is possible to detect the winding diameter of the yarn feeder loosely inserted into the peg to which the present invention is applied.

[0005]

However, in this case,
The detection accuracy depends on the number of light emitting / receiving elements constituting the photoelectric sensor, and the greater the number, the higher the accuracy. However, since the light emitting elements are installed in a horizontal line within the range corresponding to the winding diameter of the yarn supplying body, the number of light emitting elements that can be installed is limited due to the relationship between the size of the light emitting element itself and this installation range. is there. Therefore, it is possible to detect only a sampling rather than a continuous change with time of the winding diameter. That is, in the case of a photoelectric sensor, only the winding diameter corresponding to the position of the light emitting element can be detected, and a change in the winding diameter between the light emitting elements cannot be detected. Therefore, it is inevitable that the detection becomes coarse and the detection accuracy is lowered.

As an alternative to such a photoelectric detection system, one distance sensor is spaced apart from and facing the peripheral surface (peg surface) of the yarn feeder, and is either vertically above or below the yarn feeder. It is possible to provide. However, as will be described in detail later, this system has a drawback in that it cannot immediately respond to a change in the specification (diameter) of the core tube of the yarn supplying body.

In view of the state of the art as described above, an object of the present invention is to detect a temporal change in the winding diameter of a yarn supplying body with high accuracy and without being affected by a change in specifications of a core tube. .

[0008]

For this reason, according to the present invention, the yarn feeder inserted into the peg is spaced apart from the peripheral surface of the yarn feeder, and is positioned above and below the yarn feeder in the vertical direction of the yarn feeder. , A computing device connected to these distance sensors, and a setting device attached to the computing device and setting the distances L1 and L3 from each distance sensor to the peg, The gist is that the arithmetic unit calculates the winding diameter of the yarn supplying body using the distances L1 and L3 set in the setting unit and the input distance signals L2 and L4 from the distance sensor.

[0009]

The arithmetic unit performs a predetermined calculation from a distance signal indicating a detected distance from each distance sensor to the peripheral surface of the yarn supplying body and a distance signal indicating a known distance from each distance sensor to the peg. Calculate the winding diameter of the yarn supplying body.

[0010]

FIG. 1 shows an example of a winding diameter detecting device according to the present invention, in which a yarn feeder 23 loosely inserted into a peg 21 is vertically spaced apart from a peripheral surface of the yarn feeder 23. Two distance sensors 11 and 12 are provided facing each other. These distance sensors 11 and 12 are respectively connected to an arithmetic circuit shown in FIG.

The arithmetic circuit is mainly composed of an arithmetic unit 30 and two setting units 41 and 42 are additionally provided. The arithmetic unit 30 is connected to each of the distance sensors 11, 12
, And adders 33 connected to their outputs. The distance sensors 11 and 12 are distance signals L2 and L2 indicating detection distances from the respective distance sensors 11 and 12 to the peripheral surface of the yarn supplying body 23.
4 is input to the subtracters 31 and 32. Setting devices 41, 4
2 subtracts distance signals L1 and L3 indicating the known distances from the distance sensors 11 and 12 to the peg 21 to the subtractor 31,
32.

As described above, this arithmetic circuit calculates the winding diameter D of the yarn supplying body 23 by the following arithmetic expression based on the detected distance signals L2 and L4 input from the distance sensors 11 and 12. .

[0013]

(Equation 1)

In this equation, L2 and L4 are time-varying values constantly detected by the distance sensors 11 and 12, and L1 and L3 are time-lapse fixed values uniquely determined from the installation positions of the distance sensors 11 and 12. It is. This arithmetic expression does not include the diameter d of the core tube 22 of the yarn supplying body 23. Therefore, the calculation of the winding diameter D by the detecting device of the present invention is not affected at all by the change in the specification (diameter) of the core tube of the yarn supplying body.

In this connection, a system using only one distance sensor is shown in FIG. 2 and compared with the system of the present invention. As shown in FIG. 9, the arithmetic circuit in this case has a basic configuration mainly including an arithmetic unit 30 as shown in FIG. 5, and sets a known distance L1 from the distance sensor 11 to the peg 21 thereto. A setting device 41 for setting the diameter of the core tube 22 and a core tube diameter setting device 46 for setting the diameter d of the core tube 22 are additionally provided. Since the number of distance sensors is one, the subtracter 31 is also one.
The output side of the subtractor 31 has a multiplier 4
4 are connected. This multiplier 44 has its multiplier 4
4 is connected to a constant setting device 43 for setting a constant to be input. Further, an adder 47 is provided on the output side of the multiplier 44.
Are connected to each other to form a computing unit 30. Here, the known distance signal L1 from the setting device 41 is input to the subtractor 31, and the signal indicating the core diameter d from the core diameter setting device 46 is input to the adder 47. Then, the arithmetic circuit detects the detection distance signal L input from the distance sensor 11.
2, the winding diameter D of the yarn supplying body 23 is calculated by the following equation.

[0016]

(Equation 2)

In this equation, L2 is a time-varying value constantly detected by the distance sensor 11, and L1 is a time-fixed value uniquely determined from the installation position of the distance sensor 11. This arithmetic expression includes the diameter d of the core tube 22 of the yarn supplying body 23. Therefore, in the calculation of the winding diameter D by the detecting device of this system, it is necessary to reset the value of d in the core tube diameter setting device every time the specification (diameter) of the core tube 22 of the yarn supplying body 23 is changed. That is, it is impossible to immediately respond to a change in the specification (diameter) of the core tube 22.

Further, in the present invention, the distance sensor 1
The reason why the installation positions of 1 and 12 are specified vertically above and below the yarn supplying body 23 will be described with reference to FIGS. In the systems shown in these figures, one distance sensor is installed in the horizontal direction with respect to the peg 21 at a distance from the peripheral surface of the yarn supplying body 23. In any case, the winding diameter D of the yarn supplying body 23
Is to be calculated by the following arithmetic expression.

[0019]

(Equation 3)

FIG. 3 shows a case where the diameter d of the core tube 22 is small. In this case, the difference between the center of the core tube 22 and the center of the peg 21 is slight, and the distance from the center of the core tube 22 to the surface of the yarn feeder in the horizontal direction and the distance from the center of the peg 21 to the surface of the yarn feeder Is small, and the winding diameter D can be approximated by the above equation.

FIG. 4 shows a case where the diameter d of the core tube 22 is large. In this case, the difference between the center of the core tube 22 and the center of the peg 21 is large, and even if the distance L2 to the surface of the yarn feeder is used, the winding diameter D cannot be approximated by the above equation.

As is clear from the above description, the configuration in which the distance sensor is horizontally spaced from the yarn supplying body is as follows.
This is possible when the diameter of the core tube is small, but not when the diameter of the core tube is large. Therefore, in order to cope with core tubes of various specifications, it is optimal to dispose distance sensors vertically above and below the yarn supplying body as in the present invention.

By the way, in a system such as a creel of a warper in which a plurality of yarn feeders 23 are mounted on pegs in a matrix of length and width and yarns from all the yarn feeders 23 are simultaneously pulled out. Is usually the same as the initial value and the change with time of the winding diameter D of all the yarn supplying bodies 23. Therefore, if only the winding diameter D of one yarn supplying body 23 is obtained, the winding diameters D of all the yarn supplying bodies 23 are obtained.
You can know. In such a case, the interval between the pegs is often small, so that the configuration shown in FIG. 6 may be used. That is, the distance sensor 11 is disposed vertically above the uppermost yarn feeder 23 in the vertically arranged yarn feeder group, and the distance sensor 12 is disposed vertically below the lowermost yarn feeder 23. Place. Since there is a relatively large amount of space above the uppermost yarn supplying body 23 and below the lowermost yarn supplying body 23, it is possible to cope with such an arrangement even if the interval between the pegs is small. Also in this case, one yarn feeder 2
As in the case where the distance sensors 11 and 12 are arranged vertically above and below, the predetermined diameter is calculated from the distance signal from each distance sensor and the distance signal indicating the known distance by the setting device, and the winding diameter of the yarn supplying body 23 is obtained. Is calculated.

The winding diameter detecting technique of the yarn supplying body according to the present invention is as follows.
The present invention can be applied to all cases in which some measure must be taken in response to a change in the winding diameter with time. One example is the balloon control of the yarn drawn from the yarn supply disclosed in Japanese Utility Model Laid-Open No. 60-67386. That is, the separation distance of the yarn guide disposed opposite to the leading end of the yarn supplying body is changed according to the temporal change of the winding diameter of the yarn supplying body.
That is when it is changed. According to the present invention, the temporal change in the winding diameter can be detected continuously (not in a sampling manner), so that the balloon control can be performed in real time.

In addition, the winding diameter detection technology of the present invention can be applied to anti-slip systems similar to those shown in FIGS. That is, in particular, in the case of a yarn having a strong twist, the yarn is likely to be twisted when the yarn is pulled out from the yarn supplying body. Therefore, the friction band 50 guided by the guide 51 on the peripheral surface (winding surface) of the yarn supplying body 23 is used.
Contact has been made. When the winding diameter becomes smaller as shown in FIG. 7 or FIG. 8 due to a change with time, if the guides 51 are moved closer to each other according to the detection result of the winding diameter according to the present invention, the friction band 50 becomes The contact with the peripheral surface of the yarn feeder 23 is always maintained, and the occurrence of the sway can be reliably prevented.

In addition, the present invention can be applied to a system for automatically exchanging yarn supply bodies. That is, when the remaining amount (winding diameter) of the yarn supplying body is detected to be equal to or less than a predetermined amount,
The yarn feeder is automatically replaced.

[0027] The yarn supply object of the present invention includes all kinds. For example, in the case of a cheese-type yarn supplying body, the winding diameter may be detected at any position (in the axial direction of the yarn supplying body) because the winding diameter is substantially constant at any part of the yarn supplying body. Even in a tapered shape such as a cone shape, since the yarn in each part is consumed proportionally, the reference winding diameter position (with respect to the axial direction of the yarn supplying body)
There is no problem if it is set. The situation can be said to be the same in the case of the yarn supplying body of another shape.

[0028]

As described above, since the diameter of the core tube of the yarn supplying device is not involved in the calculation of the winding diameter of the yarn supplying device according to the present invention, the specification (diameter) of the core tube of the yarn supplying device can be immediately changed. be able to.

Since the winding diameter can be continuously detected with the use of only two distance sensors over time, high detection accuracy can be obtained at the minimum necessary cost.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a winding diameter detecting device according to the present invention.

FIG. 2 is a front view showing a system using only one distance sensor.

FIG. 3 is a front view showing an example of a system in which a distance sensor is horizontally spaced from a yarn supplying body.

FIG. 4 is a front view showing another example of a system in which a distance sensor is horizontally spaced from a yarn supplying body.

FIG. 5 is a block diagram showing an arithmetic circuit of the detection device.

FIG. 6 is a front view of another example of the winding diameter detection device of the present invention.

FIG. 7 is a front view showing an example of application of the present invention.

FIG. 8 is a front view of the same.

FIG. 9 is a block diagram showing another example of the arithmetic circuit.

[Explanation of symbols]

 11, 12 Distance sensor 21 Peg 30 Computing unit 31, 32 Subtractor 33 Adder 41, 42 Setting unit 50 Friction band 51 Guide D Winding diameter d Core pipe diameter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 63/00 D01H 13/32 D02H 1/00

Claims (2)

(57) [Claims] 1. Distance sensors provided above and below a yarn feeder in a vertical direction of the yarn feeder, facing away from a peripheral surface of the yarn feeder loosely inserted into a peg, and these distance sensors And a setting device in which distances L1 and L3 from the respective distance sensors to the pegs are set. The arithmetic device includes the set distances L1 and L
3 and input distance signals L2, L4 from the respective distance sensors.
A winding diameter detecting device for the yarn supplying body, wherein the winding diameter of the yarn supplying body is calculated by using the above. 2. A case in which a plurality of yarn feeders having substantially the same change over time in winding diameter are mounted in a matrix, wherein the distance sensor is spaced apart from the uppermost yarn feeder. 2. The apparatus according to claim 1, wherein the upper and lower yarn feeders are disposed vertically above and below the lowermost yarn feeder, respectively.
3. The winding diameter detecting device for a yarn supplying body according to claim 1.