JP3097381B2 - Method and apparatus for forming yarn in spinning machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for forming a yarn in a spinning machine such as a ring spinning machine or a ring twisting machine.

[0002]

2. Description of the Related Art Generally, in this type of spinning machine, the rotation speed of a front roller and the rotation speed of a spindle have a fixed ratio so that the amount of spinning from a front roller and the amount of winding on a bobbin are the same. It is set as follows. The ring rail moves up and down by a predetermined stroke (chase length) in the axial direction of the bobbin, and its position is slid upward by a predetermined amount, that is, a reference shaper step each time the ring rail moves up and down once. Thus, each time the ring rail is moved up and down, the position of the ring rail is slid upward by the reference shaper step, so that the bobbin thread is formed from the lower part to the upper part of the bobbin.

[0003] The yarn produced is the length LB of the yarn wound when it is full.
And the axial length of the tube thread, that is, the lift length Lt, must be formed so as to have a preset value. Since the relationship between the production yarn length LB and the lift length Lt is determined by the reference shaper step, it is necessary to set an appropriate reference shaper step SSC in order to keep the production yarn length LB and the lift length Lt of the tubular yarn as set. .

FIG. 5 is a graph showing the height of the ring rail with respect to the number of chase, that is, the position at which the spun yarn is wound on the bobbin. The two lines A and B indicate the upper and lower positions of the lifting, respectively, and the ring rail moves up and down between the two lines A and B for each chase, and is formed like a tube thread G on the right side in the figure. Is done.

[0005] The reference shaper step SSC set before the operation of the machine base is normally calculated by the following equation using the winding amount in the hatched portion in the figure as the production yarn length LB. SSC = (Lt−C) / (LB / L) where C is the chase length, L is the average double stroke yarn length, and the average winding yarn length per one up and down movement of the ring rail, which is calculated by the following equation. .

L = (3/2) · (π (DE + D) · C / 2000P) where DE is the average bobbin bare diameter, D is the outer diameter of the tube yarn, and P is the yarn pitch. The yarn pitch P is the yarn pitch coefficient k and the yarn count N
It is calculated from the following equation using e.

P = k / (1.06√ (Ne)) Further, since the outer diameter D of the thread cannot be obtained directly, it is simply set to a value based on the diameter R of the ring.
R-3 is set. In addition, the lower portion of the tube yarn is formed in a shape which is bulged outward by increasing winding in order to increase the production yarn length LB when the tube is full (for example, Japanese Unexamined Patent Publication No. 2-277).
No. 827).

[0008]

However, when calculating the average double-stroke yarn length L, the outer diameter D of the yarn is generally simply set to D = R-3 based on the ring diameter R. Actually, D = R−3 is not always satisfied, and an appropriate reference shaper step SSC may not be calculated. As a result, there has been a problem that both the actual production yarn length and the lift length of the tube yarn are not always as set. In addition, in the case of the tube yarn that has been wound as described above, the actual production yarn length is ΔL longer than the set production yarn length LB.
B (ΔLB = (S1 / S2) · LB, where (S1 / S
In the case of 2), the yarn is wound more by the area ratio S1 / S2) in FIG. 5, and there is a problem that the actual production yarn length does not match the set production yarn length LB.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to set a lift length of a tubing by setting a lift length of a tubing by winding a yarn by a set production yarn length. An object of the present invention is to provide a method and apparatus for forming a yarn in a spinning machine that can be made substantially equal in length.

[0010]

In order to solve the above problems, according to the first aspect of the present invention, there is provided a spinning machine driven such that the elevating speed of a ring rail and a spindle speed have a predetermined proportional relationship. Prior to the start of the formation of the tubing, the desired production yarn length and lift length for the tubing are input to the storage device via the input device as data, and arithmetic means is executed based on the data stored in the storage device. Calculates the reference shaper step which is the displacement amount of the ring rail up / down switching position per chase, and calculates the production yarn length and the lift length by performing a simulation of the formation of the tube yarn based on the calculated reference shaper step. Then, it is determined whether or not the calculated production yarn length and lift length substantially coincide with the desired production yarn length and lift length. After correcting the step length and confirming that the production yarn length and the lift length by the simulation of the yarn formation based on the reference shaper step substantially match the desired production yarn length and the desired lift length, the ring rail is determined based on the reference shaper step. Is controlled so as to form a tube thread.

According to the second aspect of the present invention, in a spinning machine driven such that the elevating speed of the ring rail and the spindle speed have a predetermined proportional relationship, data such as desired production yarn length and lift length are inputted. An input device, a first storage device for storing data input by the input device, program data for simulation of tube yarn formation, and production of a tube yarn based on the simulation. A second storage device for storing program data for calculating a reference shaper step which is a displacement amount of a lifting / lowering switching position of a ring rail per one chase to be substantially equal to a yarn length and a lift length;
Calculating means for calculating a reference shaper step based on data such as a production yarn length and a lift length and program data stored in the first storage device and the second storage device;
A control device for controlling switching of the ring rail up and down based on the reference shaper step.

[0012]

According to the first aspect of the present invention, the spinning machine is driven such that the vertical speed of the ring rail and the spindle speed have a predetermined proportional relationship. First, before starting the formation of the yarn, data such as a desired production yarn length and a lift length for the yarn is input to the storage device via the input device. The calculating means calculates a reference shaper step, which is a displacement amount of the up / down switching position of the ring rail per chase, based on the input data. The calculating means simulates the yarn formation based on the reference shaper step, calculates the production yarn length and the lift length based on the simulation, and the calculated production yarn length and the lift length are almost equal to the desired production yarn length and the lift length. Judge whether they match,
If they do not substantially match, the reference shaper step is corrected. Further, the calculating means confirms that the production yarn length and the lift length by the simulation of the yarn formation based on the reference shaper step substantially match the desired production yarn length and the desired lift length. Thereafter, the arithmetic means controls the up / down switching position of the ring rail based on the reference shaper step to form the thread. Therefore, the production yarn length and the lift length of the actually formed tubular yarn substantially match the desired production yarn length and the desired lift length.

According to the second aspect of the present invention, the spinning machine is driven such that the vertical speed of the ring rail and the spindle speed have a predetermined proportional relationship. The input device inputs desired data such as a production yarn length and a lift length, and the input data is stored in the first storage device. The calculation means calculates the reference shaper step based on the data such as the production yarn length and the lift length stored in the first storage device and the second storage device and the program data. Then, a simulation of the yarn formation is performed in the reference shaper step, and it is determined whether or not the simulation result substantially matches the desired production yarn length and the desired lift length. When the simulation result substantially coincides with the desired production yarn length and lift length, the control device controls the position of the up / down switching of the ring rail based on the reference shaper step. Therefore, the production yarn length and the lift length of the actually formed tubular yarn substantially match the desired production yarn length and the desired lift length.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
A description will be given based on FIG. A lifting device for raising and lowering the ring rail as shown in FIG. 4 is provided on the frame of the spinning machine. As shown in the figure, a line shaft 1 is rotatably disposed along the longitudinal direction on both left and right sides (only one side is shown) of a frame of a spinning machine. Many are fitted at predetermined intervals so as to be able to rotate together. On the other hand, a poker pillar 5 supporting a ring rail 4 is supported on a spindle rail (not shown) via a slide guide (not shown) so as to be vertically slidable, and a nut body 6 is provided below the slide guide. It is rotatably supported on the spindle rail. A screw portion 5a formed below the poker pillar 5 is screwed into the nut body 6, and a screw gear 7 meshing with the screw gear 2 is fitted and fixed to the lower end.
The poker pillar 9 supporting the lappet angle 8 is supported via a slide guide so as to be vertically slidable with respect to a machine frame (both not shown). The poker pillar 9 is rotatably supported by the machine frame, and a lower end screw portion 9a is screwed into a nut body 11 having a bevel gear 10 that meshes with the bevel gear 3.

A front roller 12 is mounted on the line shaft 1.
Is transmitted via gear trains 13, 14, 15 and the like,
A pair of electromagnetic clutches 16 and 17 provided in the gear train 14
The line shaft 1 is driven to rotate forward and backward in accordance with the excitation and demagnetization. This lifting device has the same configuration as that disclosed in Japanese Patent Application Laid-Open No. 62-133129.

A rotary encoder 19 for detecting the number of rotations of the intermediate shaft 18 is attached to an end of the intermediate shaft 18 at which switching between forward and reverse rotation by the electromagnetic clutches 16 and 17 is performed.
The detection signal of the rotary encoder 19 is output to the control device 20. The control device 20 controls the ring rail 4 based on the detection signal from the rotary encoder 19.
Is calculated, and when the ring rail 4 reaches a predetermined position, a switching drive signal is output to the electromagnetic clutches 16 and 17. The electromagnetic clutches 16 and 17 are demagnetized based on the switching drive signal. The control device 20 is provided with an input device 21 so that data such as the production yarn length LB and the lift length Lt of the pipe yarn are input before the operation of the machine base.

The control device 20 includes a microcomputer 2
2 are built-in. The control device 20 controls the reference shaper step SSC set by the microcomputer 22.
And switching timing of the ring rail 4 based on the detection signal from the rotary encoder 19, that is, the electromagnetic clutch 16,
The switching timing of the excitation and demagnetization is calculated and a switching drive signal is output. The drive of the electromagnetic clutches 16 and 17 is controlled by the control device 20 based on the switching drive signal.

As shown in FIG. 3, a microcomputer 22 constituting the control device 20 includes a central processing unit (hereinafter referred to as a CPU) 23 as an arithmetic means, a program memory 24 as a second storage device, and a first memory device. It comprises a working memory 25 as a storage device. Program memory 24
Is a read-only memory (RO) storing a control program
M), and the working memory 25 is a readable and rewritable memory (RAM) for temporarily storing input data input by the input device 21 and results of arithmetic processing in the CPU 23.

The CPU 23 operates based on the program data stored in the program memory 24. In the working memory 25, the production yarn length LB, the lift length Lt, the count Ne, and the increased winding coefficient d are input via the input device 21.
₀ , the chase length C, the average bobbin diameter DE, and the like are input. The program memory 24 has a front roller diameter Rf, a mechanical constant K determined from the number of rotations of the front roller and the lifting speed, a yarn pitch coefficient k for calculating the yarn pitch, and a reference shaper step SSC.
And the like are stored as program data.

The CPU23 is adapted to calculate the initial value SSC ₀ reference shaper step from various data stored in the program memory 24 and working memory 25. The CPU 23 simulates the yarn formation based on the reference shaper step SSC, determines whether or not the production yarn length LBX and the lift length Lt by simulation substantially match the respective set values. The value of the shaper step SSC is sequentially corrected. When the CPU 23 confirms that the production yarn length LBX and the lift length Lt obtained by the simulation substantially match the set production yarn length LB and the lift length Lt, the CPU 23 sets the value of the reference shaper step SSC to the set value. Has become.

The CPU 23 is connected to a clutch switching drive circuit 27 via an output interface 26. C
The PU 23 determines the timing of switching the ring rail 4 up and down, that is, the electromagnetic clutches 16 and 17 based on the set reference shaper step SSC and the detection signal from the rotary encoder 19.
Is calculated. Then, based on the calculation result, the CPU 23 outputs a switching drive signal to the clutch switching drive circuit 27 via the output interface 26. The clutch switching drive circuit 27 controls the electromagnetic clutch 1 based on the switching drive signal.
The switching of the excitation and demagnetization is performed at 6, 17.

The CPU 23 is connected to a motor drive circuit 28 via an output interface 26, and outputs a motor drive signal to the motor drive circuit 28. The motor drive circuit 28 drives and controls the motor 29 based on the motor drive signal. The driving force of the motor 29 is transmitted to the gear train 13 via a gear train (not shown).
To the front roller 1 via the gear train 13.
2 and transmitted to the line shaft 1 via the gear trains 13 to 15, respectively.
The front roller 12 and the line shaft 1 rotate synchronously at a constant rotation speed ratio.

Next, a description will be given of a method of forming a yarn using the yarn forming apparatus configured as described above. FIG. 2 is a graph showing the switching position of the ring rail 4 in the process of forming the yarn with respect to the number of chase times x. In FIG.
_U (x) is a function of the lifting upper end, and F _D (x)
Is a function of the lifting bottom. In other words, the yarn has F _U (x) and F corresponding to the number of chase for each chase.
It is wound up while being guided by the ring rail between _D (x).

Prior to the operation of the machine stand, first, the production yarn length LB
(Hereinafter referred to as set thread length LB), lift length Lt, and count N
Setting conditions for forming the thread, such as e, the increased winding coefficient d ₀ , the chase length C, and the average bobbin bare diameter DE, are input to the control device 20 via the input device 21. The input data is stored in the working memory 25. The control device 20 simulates the thread formation before the operation of the machine base on the basis of the input data, and calculates a reference shaper step SSC which determines the switching timing of the excitation and demagnetization of the electromagnetic clutches 16 and 17.

The processing operation of the CPU 23 for calculating the reference shaper step SSC will be described below with reference to the flowchart of FIG. First, in step 1 (hereinafter, step is referred to as S), the CPU 23
The set thread length LB, lift length Lt, count Ne,
Increased winding coefficient d ₀ , chase length C, average bobbin bare diameter DE
Is read out from the working memory 25. Next, S2
, The CPU 23 calculates the average double-stroke yarn length L from the read data of the chase length C. The average double stroke yarn length L is calculated by the following equation.

L = (3/2) · (π (DE + D) · C / 2000P) Here, DE is an average bobbin bare diameter, D is a tube thread outer diameter, and P is a thread pitch. The yarn pitch P is the yarn pitch coefficient k and the yarn count N
It is expressed by P = k / (1.06√ (Ne)) using e. Further, the outer diameter D of the thread is simply set to D = R−3 based on the diameter R of the ring.

[0027] In S3, CPU 23 calculates the initial value SSC ₀ reference shaper step SSC. This initial value SSC ₀ is calculated by the following equation. SSC ₀ = (Lt−d ₀ ) / (LB / L) That is, SSC ₀ is the displacement amount (Lt−d) of the function F _U (x) at the upper end of the lifting in FIG.
d ₀ ) by the approximate value of the number of chase (LB / L).

In S4, the CPU 23 calculates the chase length C (x) in the incremental winding section (0 ≦ x ≦ C / SSC), that is, the vertical stroke of the ring rail 4 in the incremental winding section. Here, the function F _U (x) at the upper end of the lifting and the function F _D (x) at the lower end of the lifting in the increased winding section are respectively: F _U (x) = SSC · x + C−d ₀ F _D (x) = (SSC / C) ² · (C-d ₀ ) × ² . The CPU 23 calculates the chase amount C (x) from the following equation.

C (x) = F _U (x) −F _D (x) = − (SSC / C) ² · (C−d ₀ ) × ² + SSC · x + C−d _{0 In} S5, the CPU 23 performs the increase winding section. (0 ≦ x ≦ C
/ SSC) to calculate the double stroke yarn length L (x). The double stroke yarn length L (x) is calculated by the following equation.

L (x) = (Rf / K) · C (x) where Rf is the diameter of the front roller, and K is a mechanical constant, which is a constant determined by the rotation speed of the front roller and the lifting speed.

Next, in S6, the CPU 23 determines the yarn length LB1 to be wound in the increased winding section (0 ≦ x ≦ C / SSC).
Is calculated. The yarn length LB1 is calculated by the following equation.

[0032]

(Equation 1) In S7, the CPU 23 sets the normal winding section (C / SSC
<X ≦ x _n ) to calculate the yarn length LB2 to be wound. The yarn length LB2 is calculated by the following equation.

LB2 = L · {Lt− (2C−d ₀ )} / SSC In S8, the CPU 23 calculates the total yarn length LBX when the tube is full by the following equation. LBX = LB1 + LB2 In S9, the CPU 23 determines whether or not the thread length LBX obtained from the simulation is substantially equal to the set thread length LB read from the working memory 25 within an allowable value ± δ. That is, it is determined whether or not the absolute value | LBX−LB | of the difference between the yarn length LBX and the set yarn length LB is smaller than the allowable range δ.

If the | LBX-LB | value is smaller than δ in S9, the CPU 23 proceeds to S11 and sets the SSC value at that time as the reference shaper step actually used. Then, the CPU 23 ends the processing operation of this routine. Here, it is determined that the set reference shaper step SSC value substantially matches the production yarn length LB and the lift length Lt in which the production yarn length LBX and the lift length Lt of the actually formed yarn are set. Is a value confirmed in advance by the simulation.

On the other hand, if the value | LBX-LB | is greater than δ, the CPU 23 multiplies the reference shaper step SSC by (LBX / LB) (LBX / LB) in S10.
LB) · SSC is set as a new reference shaper step SSC, and the process shifts from S10 to S4. After that, CP
U23 repeats the processing operations from S4 to S10 until the | LBX-LB | value becomes smaller than δ in S9. Then, when the | LBX−LB | value becomes smaller than δ, the process shifts to S11.

Thereafter, the CPU 23 outputs a motor drive signal to the motor drive circuit 28 via the output interface 26, and the motor drive circuit 28 starts driving the motor 29 based on the motor drive signal. The driving force of the motor 29 is transmitted once to the gear train 13 via a gear train (not shown), transmitted to the front roller 12 via the gear train 13, and transmitted to the line shaft 1 via the gear trains 13 to 15.
Respectively. As a result, the front roller 12
And the line shaft 1 rotate synchronously at a constant rotation speed ratio.

The CPU 23 calculates the timing for outputting the switching drive signal based on the set reference shaper step SSC and the detection signal from the rotary encoder 19. Based on the calculation result, the CPU 23 outputs a switching drive signal to the clutch switching drive circuit 27. The electromagnetic clutches 16 and 17 are demagnetized by the clutch switching drive circuit 27 based on the switching drive signal. When the electromagnetic clutch 16 is excited and the electromagnetic clutch 17 is demagnetized, the line shaft 1 is driven to rotate forward, and conversely, the electromagnetic clutch 16
Is demagnetized and the line shaft 1 is driven in reverse when the electromagnetic clutch 17 is excited. Thus, the line shaft 1 rotates forward and backward.

The nut body 6 is driven via the screw gears 2 and 7 and the nut body 11 is driven via the bevel gears 3 and 10 in accordance with the forward / reverse rotation of the line shaft 1.
The forward and reverse rotation driving force of the nut bodies 6, 11 is
Is transmitted to the ring rail 4 and the wrappet angle 8 via the screwed portions 5a and 9a into which the ring rail 4 and the lappet angle 8 are moved synchronously.

As described in detail above, according to the method and apparatus for forming the yarn in the spinning machine of this embodiment, the simulation of the yarn formation is performed before the operation of the machine stand, and the actual production yarn length LBX and Production yarn length LB with lift length Lt set
And it can be confirmed in advance that they substantially coincide with the lift length Lt. As a result, by actually forming the yarn based on the reference shaper step SSC obtained from the simulation, the production yarn length LB and the lift length Lt when the formed yarn is full are almost as set. Can be. Further, in the case of the increased winding yarn such as in the present embodiment, the production yarn length LBX obtained from the simulation of the formation of the yarn is a value in which the increased winding length is also taken into consideration, and thus the actual production yarn length LBX and the set production yarn length are set. LB can be surely substantially matched. Further, even if the conditions such as the production yarn length LB, the lift length Lt, and the yarn count Ne are changed,
Since it is confirmed in advance by simulation that the setting is the same as the setting, it is possible to always provide a uniform yarn having the set yarn length and shape as set.

It should be noted that the present invention is not limited to the above-described embodiment, and may be configured as follows without departing from the spirit of the invention. (1) In the above embodiment, the yarn length LB of the normal winding section is determined in S7.
2 was calculated at once from the calculation formula, but the loop length LB of the normal winding section was calculated by a loop that is sequentially added for each chase.
2 may be calculated.

(2) The front roller 12 and the line shaft 1 may be driven by separate motors whose speed can be controlled. In this case, the rotation speed ratio between the front roller 12 and the line shaft 1 can be made constant by controlling the speed of each motor.

(3) In the above embodiment, the present invention is applied to an increased-winding tubing in which the lower portion of the tubing is expanded, but the present invention is applied to a normal tubing having a flat lower portion of the tubing. You may. (4) Instead of using the pair of electromagnetic clutches 16 and 17 as the forward / reverse driving means for the line shaft 1, a variable speed lifting motor capable of forward / reverse rotation may be used.

[0043]

As described above in detail, according to the present invention, when the yarn is wound by the set production yarn length to form the yarn, the lift length of the yarn can be made substantially equal to the set lift length. It has an excellent effect that it can be done.

[Brief description of the drawings]

FIG. 1 is a flowchart for calculating a reference shaper step and a production yarn length according to an embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the number of chase and the height of a ring rail in a tube thread forming process in one embodiment.

FIG. 3 is a block diagram showing an electrical configuration of the tube thread forming device in one embodiment.

FIG. 4 is a schematic perspective view of a lifting device according to one embodiment.

FIG. 5 is a graph showing the relationship between the number of chase and the height of a ring rail in a tube thread forming process in the prior art.

[Explanation of symbols]

4 ... Ring rail, 20 ... Control device, 21 ... Input device,
23: CPU as arithmetic means, 24: program memory as second storage device, 25: working memory as first storage device, LB: production thread length, Lt: lift length, SS
C: Reference shaper step.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-190030 (JP, A) JP-A-2-277827 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D01H 1/36

Claims (2)

(57) [Claims] 1. A spinning machine driven such that the elevating / lowering speed of a ring rail and the spindle speed are in a predetermined proportional relationship, wherein a desired production yarn length, a lift length, etc., for the yarn before starting the yarn formation. Is input as data to a storage device via an input device, and a calculation unit calculates a reference shaper step, which is a displacement amount of a ring rail elevation switching position per chase, based on the data stored in the storage device. Then, the production yarn length and the lift length are calculated by performing a simulation of the yarn formation by the calculating means based on the calculated reference shaper step, and the calculated production yarn length and the lift length are almost equal to the desired production yarn length and the lift length. It is determined whether or not they match, and if they do not substantially match, the reference shaper step is corrected, and the yarn forming thread based on the reference shaper step is adjusted. After confirming that the production yarn length and the lift length by the simulation substantially match the desired production yarn length and the lift length, in the spinning machine that forms the yarn by controlling the up / down switching position of the ring rail based on the reference shaper step. Tube thread forming method. 2. An input device for inputting data such as a desired production yarn length and a lift length in a spinning machine driven such that a lifting speed of a ring rail and a spindle rotation speed have a predetermined proportional relationship. A first storage device for storing the data input by the computer; a program data for the simulation of the formation of the yarn; and a production yarn length and a lift length of the yarn based on the simulation substantially coincide with the desired production yarn length and the lift length. A second storage device for storing program data for calculating a reference shaper step which is a displacement amount of a lifting / lowering switching position of a ring rail per chase to be performed, and the first storage device and the second storage Calculation for calculating the reference shaper step based on the data such as the production yarn length and lift length and the program data stored in the device Stage and, cop forming apparatus for a spinning machine having a control device for controlling the position of the elevating switching ring rail based on the reference shaper step.