JPH0525727A - Apparatus for measuring spun yarn length of ring spinning frame - Google Patents

Abstract

PURPOSE:To measure the real length of a spun yarn wound on a bobbin in high accuracy. CONSTITUTION:Spinning conditions such as the supplied roving weight and target denier of spun yarn inputted by an inputting device 20 and the number of the tooth of change gears 14, 15 set at the adjustment of the spinning conditions are stored in an operation memory 21. The output signal of a rotational speed detector 16 is inputted into a CPU 18. The CPU 18 calculates the cumulative rotational number of a front roller 6 from the start of spinning and multiplies the value with the circumferential length of the front roller 6 to obtain the cumulative circumferential length. The theoretical draft ratio and the real draft ratio are calculated by the CPU 18 from the spinning conditions and the spun yarn length is calculated by multiplying the cumulative circumferential length with the ratio of the theoretical draft ratio to the real draft ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spun yarn length measuring device for a ring spinning machine.

[0002]

2. Description of the Related Art In a ring spinning machine, a roving is drafted by a drafting device, sent out from a front roller, and twisted by the action of a traveler traveling on a ring mounted on a ring rail that is moved up and down. To be wound up. The operation of the spinning machine is stopped when a predetermined amount of yarn is wound on the bobbin, the doffing of full bobbins and the supply of empty bobbins are performed, and then the operation of the spinning machine is restarted. Conventionally, the rotation number of the front roller of the spinning machine is detected,
A method has been proposed in which the doffing time of each spinning machine is managed based on the cumulative number of revolutions from the start of spinning, and the production amount is managed from the cumulative number of revolutions and the number of doffing. 62-141133). In addition, in general, the cumulative number of rotations of the front roller of the spinning machine is detected, and the value obtained by multiplying the value by the circumferential length of the front roller is displayed as the spun yarn length, and the control of the spinning operation of each spinning machine is stopped. It was used as the control data necessary for the control of the doffing time and the production amount.

[0003]

The length of the yarn wound on the bobbin is not the same as the length of the fleece fed from the front roller, and as a result of the twist shrinkage, it is shortened by 3 to 8% although it varies depending on the yarn type. .. Therefore, conventionally, the test spinning is performed before the actual spinning operation is performed, and the draft condition for obtaining the yarn of the target count is obtained.After that, when the same spinning condition is used, the spinning operation is performed under the draft condition. .. When the value obtained by multiplying the cumulative number of rotations of the front roller by the circumference of the front roller is used as the spun yarn length as described above, the spun yarn length is longer than the length of the yarn actually wound on the bobbin. Become. The spun yarn length calculated from the cumulative number of rotations of the front roller is used to determine the start timing of the full-pipe stop operation that stops the spinning machine when a predetermined amount of yarn is wound on the bobbin. The yarn length is not always necessary. Further, conventionally, in a spinning factory, the amount of yarn produced by a ring spinning machine is controlled by weight instead of length. Therefore, even if the length of the yarn actually wound on the bobbin was shorter than the measured spun yarn length, there was almost no problem.

On the other hand, generally, a yarn produced by a ring spinning machine is rewound by a winder into a package having a size and shape suitable for a post process. Since the winder manages production control based on the length of the yarn wound back into the package, the spun yarn length of the spinning machine is used to control whether or not the required amount of yarn is produced by the winder. Need to be measured accurately. However, as described above, the conventional measuring device cannot accurately measure the spun yarn length. If the twist shrinkage ratio of the yarn is constant, it is possible to correct it by multiplying the measured spun yarn length detected by the conventional device by a constant coefficient.
However, the twist shrinkage ratio of the yarn differs depending on the yarn type, the yarn count, the set twist coefficient, and the like, and cannot be uniformly corrected.

The present invention has been made in view of the above problems, and its object is to spin a ring spinning machine capable of accurately measuring the length of an actual spun yarn wound on a bobbin. An object is to provide a yarn discharge length measuring device.

[0006]

In order to achieve the above-mentioned object, in the present invention, a rotation speed detecting means for detecting the rotation speed of the front roller, a supply roving weight, a spinning target count and a spinning adjustment in advance are adjusted. An input device for inputting the determined spinning condition such as the actual draft ratio or the number of teeth of the change gear, a storage means for storing the spinning condition input by the input device, and a spinning device detected by the rotation speed detection device. The cumulative peripheral length from the start of feeding is multiplied by the peripheral length of the front roller to calculate the cumulative peripheral length, and the accumulated peripheral length is calculated from the value and the theoretical draft ratio and the actual draft ratio under the spinning conditions input by the input device. And a calculation means for calculating the yarn discharge length.

[0007]

The spinning conditions such as the roving weight to be supplied, the target spinning number, and the actual draft ratio or the number of teeth of the change gear determined in advance during the spinning adjustment are input by the input device prior to the operation of the spinning machine. It is stored in the storage means. When the operation is started, the rotation speed detecting means detects the rotation speed of the front roller. Then, the calculating means calculates the cumulative circumference by multiplying the cumulative number of revolutions from the start of spinning by the circumference of the front roller, and multiplying the value by the ratio of the theoretical draft ratio and the actual draft ratio, the spun yarn length To calculate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention is shown in FIG.
It will be described with reference to FIG. As shown in FIG. 1, a chin pulley 3 is fitted and fixed to a driving shaft 2 which is rotationally driven by a motor 1, and a spindle 4 is rotated via a belt 5 wound between the chin pulley 3 and the spindle 4. Is becoming A front roller 6 which constitutes a draft device is connected to the driving shaft 2 through a gear train 7. The middle roller 8 has a gear train 9,1.
The back roller 12 through the gear trains 9 and 1
They are connected to the front roller 6 via 0 and 13, respectively. The rollers 6, 8 and 12 rotate in a state of gripping the roving yarn in cooperation with a top roller (not shown).

The gear train 10 has a change gear 14 for changing the rotation speed ratio of the front roller 6 and the back roller 12, and the gear train 11 changes the rotation speed ratio of the middle roller 8 and the back roller 12. Change gears 15 are provided respectively. At a position corresponding to the gear fitted and fixed to one end of the front roller 6, a rotation speed detector 16 as a rotation speed detecting means for detecting the rotation speed of the front roller 6 is provided.

The microcomputer 17 constituting the yarn length measuring device is a central processing unit (hereinafter referred to as CPU) as a calculating means.
18), a program memory 19 including a read-only memory (ROM) storing a control program, input data input by the input device 20, and the CPU 18
And a working memory 21 as a storage means composed of a readable and rewritable memory (RAM) for temporarily storing the calculation processing result and the like, and the CPU 18 operates based on the program data stored in the program memory 19. The output signal from the rotation speed detector 16 is input to the CPU 18. The input device 20 inputs the spinning conditions such as the weight of the supplied roving yarn, the target spinning number, and the number of teeth of the change gears 14 and 15 which are determined in advance during the spinning adjustment.

The CPU 18 inputs the output signal from the rotational speed detector 16 to calculate the cumulative number of revolutions of the front roller 6 from the start of spinning, and multiplies the value by the circumference of the front roller 6 to accumulate the value. Calculate the circumference. And
The spun yarn length is calculated from the cumulative circumference and the theoretical draft ratio and the actual draft ratio under the spinning conditions input by the input device 20.

Next, the operation of the device configured as described above will be described. Prior to the operation of the spinning machine, after inputting the spinning conditions such as the weight of the supplied roving yarn, the target spinning number and the number of teeth of the change gears 14 and 15 previously determined at the time of the spinning adjustment with the input device 20, the operation is started. To do. When the driving shaft 2 is rotated by driving the motor 1, the spindle 4 is rotationally driven via the chin pulley 3 and the belt 5. or,
The front roller 6, the middle roller 8 and the back roller 12 are rotationally driven via the gear trains 7, 9, 10, 11, and 13. Then, the roving yarn supplied to the draft device is drafted, sent out from the front roller 6, and wound around a bobbin (not shown) while being twisted by the action of the traveler traveling on the ring.

When drafting a roving yarn of cotton count R into a yarn of cotton count Y, the theoretical draft ratio D is represented by D = R / Y. However, FIG. 2 is a schematic view showing a case where the roving drafted by the draft device is wound as a fleece F without being twisted and a case where the roving is wound as a yarn y by the action of a traveler. The cross-sectional area Sy of the yarn y is larger than the cross-sectional area Sf of the fleece F as shown in FIG. That is, when spinning is performed using the theoretical draft ratio D as the draft ratio, when the yarn is twisted into a yarn, the yarn is actually wound on the bobbin as a result of twist shrinkage, and the yarn count Is smaller than the target count Y. Therefore, spinning is carried out using a draft ratio DR that is larger than the theoretical draft ratio D as the draft ratio with which the yarn of the target count is obtained. Then, test spinning is carried out before the actual spinning operation, and the change gears 14, 15 having the actual draft ratio DR at which the target yarn count is obtained.
The number of teeth is determined, and thereafter, under the same spinning conditions, the change gears 14 and 15 having that number of teeth are used to perform spinning operation.

The volume of the fleece F sent from the front roller per unit time is equal to that of the yarn y wound on the bobbin. When the cross-sectional area of the fleece F sent out from the front roller is Sf, the length is Lf, the cross-sectional area of the yarn y wound on the bobbin is Sy, and the length is Ly, the following formula is established.

Ly × Sy = Lf × Sf ... Further, the above-mentioned cross-sectional areas Sf and Sy have the following relationship with the theoretical draft ratio D and the actual draft ratio DR.

Sf / Sy = D / DR From the formula, Ly = Lf × (Sf / Sy) ... By substituting the formula into the formula, Ly = Lf × (D / DR) ... Also, the fleece F sent from the front roller Lf is equal to the cumulative circumference of the front roller 6. Therefore,
The length Ly of the yarn y wound on the bobbin is calculated by adding the theoretical draft ratio D and the actual draft ratio DR to the cumulative circumference of the front roller 6.
It becomes equal to the value multiplied by the ratio D / DR.

The CPU 18 calculates the theoretical draft ratio D from the weight of the supplied roving yarn and the target spinning number input by the input device 20.
Then, the actual draft ratio DR is calculated from the number of teeth of the change gears 14 and 15. On the other hand, the cumulative rotation number of the front roller 6 from the start of spinning is calculated based on the output signal of the rotation speed detector 16, and the value is multiplied by the circumferential length of the front roller 6 to calculate the cumulative circumferential length. Then, the spun yarn length is calculated by multiplying the cumulative circumference by the ratio D / DR of the theoretical draft ratio D and the actual draft ratio DR. The CPU 18 outputs a full pipe stop signal when the spun yarn length becomes equal to a preset yarn length at the time of starting the full pipe stop operation. Further, the spun yarn length is displayed on a display device (not shown).

The test spinning before the actual spinning of the yarn of the target yarn count has been indispensable conventionally, and the number of teeth of the change gear determined corresponding to each spinning condition is used for other spinning conditions. The length of the yarn wound on the bobbin (spun yarn length) is only required to be input with the input device 20 together with (the supplied roving yarn weight and the target spinning yarn number).
Is accurately measured regardless of the change in the twist shrinkage ratio due to the difference in raw material type, target count and twist coefficient.

The present invention is not limited to the above-described embodiments, and for example, instead of detecting the rotation speed of the gear fixed to the end portion of the front roller 6, the rotation speed of the motor 1 or another gear. It is also possible to detect the number of rotations of the above and convert it into the number of rotations of the front roller 6. Further, instead of inputting the number of teeth of the change gears 14 and 15 obtained by the test spinning, the actual draft ratio DR calculated from the value may be input. Alternatively, the spindle may be driven by a tangential belt instead of being driven by a chin pulley, and the spindle and the draft device may be driven by separate motors. Further, not only the spinning machine configured to change the draft ratio by changing the change gear, but also the device disclosed in, for example, Japanese Patent Laid-Open No. 62-162031,
The present invention may be applied to a spinning machine in which the front roller and the back roller are configured so that they can be speed-changed independently by different motors. In this case, the actual draft ratio obtained during the test spinning is input by the input device together with other spinning conditions during the actual spinning operation. Furthermore, instead of separately providing the microcomputer 17 for the yarn length measuring device, a microcomputer of the drive control device of the spinning machine may be used.

[0020]

As described above in detail, according to the present invention, the length of the spun yarn wound around the bobbin can be accurately measured regardless of the spinning conditions, and the production amount in connection with the winder process can be improved. The length of the spun yarn can be managed without any trouble. Further, the data to be input to the apparatus can be obtained at the time of the spinning adjustment which is conventionally performed, and it is not necessary to perform extra work.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment embodying the present invention.

FIG. 2 is a schematic diagram showing the relationship between the fleece and the yarn.

[Explanation of symbols]

6 ... Front roller, 14, 15 ... Change gear, 16
... rotation speed detector, 18 ... CPU as arithmetic means, 2
0 ... Input device, 21 ... Working memory as storage means.

Claims (1)

Claim: What is claimed is: 1. A rotation speed detecting means for detecting a rotation speed of a front roller, a weight of a supplied roving yarn, a spinning target count, and an actual draft ratio or a change gear tooth determined in advance during spinning adjustment. An input device for inputting the spinning conditions such as the number, a storage means for storing the spinning conditions input by the input device, and a cumulative rotation speed from the start of spinning detected by the rotation speed detection means. A calculation means for calculating the accumulated circumference by multiplying the circumference of the roller and calculating the spun yarn length from the value and the theoretical draft ratio and the actual draft ratio under the spinning conditions input by the input device are provided. Equipped with a spinning machine for measuring the spun yarn length.