JPH06294024A - Operation method at start-up of winding of roving frame - Google Patents

Abstract

PURPOSE:To surely prevent the flotation of a bobbin at the initial stage of winding even by increasing the speed of a roving frame. CONSTITUTION:The relationship between the weight of a roving bobbin and the operation condition not to cause the flotation of the bobbin from a bobbin wheel in the lowering of a bobbin rail is stored in a memory as a data base. The prescribed weight of the roving bobbin not to cause the flotation of the bobbin is determined corresponding to the stationary spinning operation condition inputted from an inputting apparatus. A prescribed spun roving length corresponding the determined value is calculated. The winding operation is continued under an operation condition not to cause the flotation of an empty bobbin until the length of the spun roving reaches the prescribed length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a roving machine at the beginning of winding.

[0002]

2. Description of the Related Art Generally, in a bobbin reed type roving machine, a roving fed out from a front roller at a constant speed is coarsened by a difference in rotational speed between a flyer rotating at a predetermined speed and a bobbin rotating at a higher speed. Wind the yarn around the bobbin while twisting it. The bobbin is supported on the bobbin rail and is moved up and down together with the bobbin rail, and the moving distance of the bobbin rail is shortened each time the direction of the bobbin rail lifting movement is changed, so that both ends of the roving bobbin are roughened so as to have a conical shape. The yarn is wound up.

In order to satisfactorily wind the roving, it is necessary to keep the roving tension at the time of winding constant while the roving between the front roller and the flyer top has an appropriate slack. In order to keep the roving tension constant, it is necessary to wind the roving so that the amount of roving and the amount of roving are almost the same. When the rotation speed of the bobbin is kept constant from the start to the end of winding, the winding speed increases as the winding roving layer increases (the roving winding diameter increases). Conventionally, as a method of keeping the tension of the roving yarn at the time of winding constant, a transmission using a pair of cone drums and a belt shifter sequentially rotates the bobbin as the roving yarn layer wound on the bobbin increases. It was controlled to decrease.

In recent years, in order to improve the productivity of the roving spinning machine, there is a tendency that speeding up and large packaging are performed. The centrifugal force that acts on the roving during winding increases with the diameter of the roving, that is, with the increase in the winding amount of the roving and the rotation speed of the flyer. It is necessary to suppress the roving so that it is equal to or less than a certain value within a range in which an illegal draft does not occur. When increasing productivity by increasing the speed and large packaging, the rotation speed of the flyer is gradually reduced from the start of winding to full pipe, or it is kept constant until the predetermined winding amount is reached.
After that, the method of gradually lowering is taken.

[0005] In general, when the roving frame is started up, a steady operating speed is reached in an extremely short time. That is, in the roving machine, the rotation speed of the flyer is constant from the beginning of winding to the full pipe, or the rotation speed of the bobbin is changed regardless of whether the flyer is operated in a variable speed in response to large packaging and higher machine speed. The moving speed of the bobbin rail is highest at the beginning of winding.

[0006]

However, in the operating method of reaching the steady operating speed in a short time when starting the roving frame, the bobbin is lifted from the bobbin wheel in the initial stage of winding due to the speedup of the machine base. The bobbin returns to its original position again. As a result, there is a problem that noise is generated and the roving cannot be properly wound around the bobbin at the beginning of winding.
There is also a problem that the life of the bobbin is shortened.

As a result of observing this phenomenon in detail, the bobbin was lifted up when the second and fourth layers, in which the bobbin rail descends, were wound, although it varied depending on the spinning conditions.
Moreover, it was often the case that synthetic fiber was used as the raw material of the roving yarn. This phenomenon means that when the rotation speed of the flyer becomes faster due to the higher speed, the force that presses the bobbin against the flyer guide leg by the flyer presser becomes stronger, and the bobbin rail descends faster, causing the bobbin to descend later than the bobbin rail. It is thought that it will occur because.

As a method for starting the roving frame, a method is used in which the machine base is rapidly raised by a start command, then the machine frame is rotated at a low speed after an extremely short period of time, and the machine is rotated at a low speed for a predetermined period of time and then a cushion operation is started for steady operation. (JP-A-56-1
No. 65022). In this method, a low speed operation is performed in the initial stage of winding, but it is performed for the purpose other than preventing the bobbin from rising. Also in this method, the time until the machine base is brought into steady operation is until the winding of the roving yarn of the first layer is completed or during the winding of the second layer. Therefore, the lifting of the bobbin cannot be eliminated.

The present invention has been made in view of the above problems, and an object thereof is to provide a roving machine capable of reliably preventing the bobbin from being lifted up in the initial stage of winding even when the speed of the machine base is increased. It is to provide a driving method at the beginning of winding.

[0010]

In order to achieve the above-mentioned object, according to the present invention, a bobbin is lifted from a bobbin wheel when the bobbin rail is lowered in the initial stage of winding in a roving machine capable of controlling the spinning speed. The relationship between the operating speed that does not exist and the weight of the roving bobbin is obtained in advance, and the winding operation is performed below the operating speed at least when the bobbin rail is lowered.

According to the second aspect of the invention, in the roving machine capable of controlling the spinning speed, the operating conditions and the weight of the roving bobbin or the weight of the bobbin which does not cause the bobbin to rise from the bobbin wheel when the bobbin rail is lowered. The relation with the corresponding amount is stored in the control unit as a database or an arithmetic expression, and the predetermined weight of the roving bobbin that does not cause the bobbin to rise during steady operation of the spinning conditions input by the input means or the corresponding weight The amount was determined, and the winding operation was performed under the operating conditions in which the empty bobbin did not rise until the weight of the roving bobbin reached the predetermined weight.

[0012]

According to the present invention, the relationship between the operating speed and the bobbin weight that does not cause the bobbin to lift up from the bobbin wheel when the bobbin rail is lowered in the initial stage of winding is obtained in advance. Then, at least when the bobbin rail is lowered in the initial stage of winding, the winding operation is performed at a speed equal to or lower than the operating speed.
Therefore, lifting of the bobbin from the bobbin wheel is reliably prevented.

According to the second aspect of the present invention, the relationship between the operating condition under which the bobbin is not lifted from the bobbin wheel and the weight of the roving bobbin or the corresponding amount is stored in the control unit as a database or an arithmetic expression. It The control unit, based on the spinning conditions input by the input means and the database or the arithmetic expression, the predetermined weight of the roving bobbin that does not cause the bobbin to rise during steady operation under the spinning conditions, or an amount corresponding to the predetermined weight. Ask for. Then, until the weight of the roving winding bobbin reaches the predetermined weight, the winding operation is performed under operating conditions in which the empty bobbin does not lift.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. The drive system of the roving machine is basically the same as that previously proposed by the applicant of the present application (Japanese Patent Laid-Open No. 63-264923), but the bobbin rail up / down switching mechanism is different. As shown in FIG. 3, the front roller 1 is rotated via a gear train (none of which is shown) arranged between one end of the rotary shaft 1a and a driving shaft which is rotationally driven by the main motor M. It is designed to be driven. A driven gear 3 is fitted and fixed on the upper portion of the flyer 2 so as to be integrally rotatable. A drive gear 5 meshing with the driven gear 3 is fitted on the rotary shaft 4. The rotation of the driving shaft is transmitted to the rotary shaft 4 via a belt transmission mechanism. On the other hand, bobbin rail 6
A driven gear 7a is fixed to the bobbin wheel 7 mounted above. A rotating shaft 9 to which a driving gear 8 meshing with the driven gear 7a is fitted and fixed has a rotational force of a driving shaft and a rotational force of a winding motor 11 which is speed-changed via an inverter 10b. The gear mechanism 12 combines and transmits. The winding motor 11, the differential gear mechanism 12, and the like constitute a winding speed transmission that reduces the bobbin rotation speed in response to an increase in the roving winding layer.

A lifter rack 13 is fixed to the bobbin rail 6. Gear 1 meshing with lifter rack 13
The rotation of the drive shaft 17 is transmitted to the rotary shaft 15 to which 4 is fitted via the switching mechanism 18 and the gear train. Drive shaft 17
Is driven by a lifting motor 16 that is variable-speed driven via an inverter 10c. The switching mechanism 18 is an intermediate shaft 19
And a pair of gear trains 20, 21 provided between the intermediate shaft 19 and the drive shaft 17, and electromagnetic clutches 22, 23 for transmitting the rotation of the gear trains 20, 21 to the intermediate shaft 19. ing. The electromagnetic clutches 22 and 23 are excited and demagnetized to rotate the rotating shaft 15, that is, the bobbin rail 6.
The direction of the vertical movement of the is changed. A rotary encoder 24 as a sensor for detecting the moving direction of the bobbin rail 6 is connected to the end of the rotary shaft 15. Further, a gear 2 that is rotated integrally with the front roller 1
A rotation speed detector 26 is arranged in the vicinity of 5.

Next, a control circuit for driving and controlling the drive system will be described with reference to FIG. A microcomputer 28 constituting a control device 27 as a control unit is input by a central processing unit (hereinafter referred to as CPU) 29, a program memory 30 including a read-only memory (ROM) storing a control program, and an input device 31. And a work memory 32 including a rewritable and rewritable memory (RAM) for temporarily storing the input data and the arithmetic processing result in the CPU 29. The CPU 29 operates based on the program data stored in the program memory 30.

An input device 31 as an input means for inputting spinning conditions such as spun roving weight (gelen), fiber type, flyer rotational speed, empty bobbin weight, etc. is integrally incorporated in the controller 27 as a keyboard. . The rotary encoder 2
4 and the output signals from the rotation speed detector 26 are input to the CPU 29 via the input interface 33.

The electromagnetic clutches 22 and 23 are the CPU 29.
The excitation / demagnetization of the bobbin rail 6 is controlled by the electromagnetic clutch excitation / demagnetization circuit 34 on the basis of the signal from the above, so that the bobbin rail 6 is switched up and down. Further, the CPU 29 includes an output interface 35 and motor drive circuits 36a, 36b, 3
The main motor M, the winding motor 11, and the lifting motor 16 are drive-controlled via the 6c and the inverters 10a, 10b, 10c.

The program memory 30 stores a database showing the relationship between the operating conditions under which the bobbin B is not lifted from the bobbin wheel 7 and the weight of the roving bobbin. The database is preliminarily obtained by tests according to the fiber type and the presser type.

Next, the operation of the apparatus constructed as described above will be described. As shown in the flowchart of FIG.
Prior to the operation of the machine stand, spinning conditions such as spun roving weight (gelen), fiber type, flyer rotation speed during steady operation, empty bobbin weight, flyer rotation speed during low speed operation, etc. are input by the input device 31. . The low-speed operation flyer rotation speed is a value at which the empty bobbin does not rise when the bobbin rail 6 is lowered. When the spinning condition is input, the CPU 29 determines the roving bobbin corresponding to the flyer rotation speed that does not cause the bobbin B to rise during the steady operation under the spinning condition based on the spinning condition and the database. Calculate the weight. Then, the predetermined spun roving length corresponding to the weight is calculated from the predetermined weight, the empty bobbin weight, and the spun roving weight, and the predetermined spun roving length is stored in the working memory 32.

After that, the operation of the machine base is started, and the front motor 1 and the flyer 2 are rotationally driven by the main motor M, respectively. At the same time when the machine base is started, the winding motor 1
1 and the lifting motor 16 are also driven to drive the differential gear mechanism 12
Of the main motor M input to the winding motor 11 and the winding motor 11
Is combined by the differential gear mechanism 12, and the combined rotating force drives the rotating shaft 9 to rotate the spindle 7. As a result, the roving R drawn by the draft device is twisted by the flyer 2 and wound in layers on the bobbin B that rotates at a higher speed than the flyer 2. Further, the bobbin rail 6 is moved up and down together with the lifter rack 13 via the switching mechanism 18, the rotating shaft 15 and the like by driving the lifting motor 16.

At the start of operation, the flyer 2 is driven at a predetermined low speed rotation, and the bobbin wheel 7 is also driven at a predetermined low speed rotation corresponding to the rotational speed of the flyer 2 and the number of wound roving layers. An output signal from the rotation detector 26 is input to the CPU 29 at the same time when the machine base is started. The CPU 29 calculates the spun roving length based on the signal. Then, the spun roving length and the predetermined spun roving length are compared, and the low speed operation is continued until the spun roving length becomes equal to the predetermined spun roving length. During low speed operation, the rotational speed of the flyer 2 is kept constant. On the other hand, the rotating speed of the bobbin wheel 7 and the ascending / descending speed of the bobbin rail 6 are reduced to a predetermined speed corresponding to the flyer rotating speed and the number of wound roving layers each time the number of wound roving layers increases.

When the spun roving length becomes equal to the predetermined spun roving length, the CPU 29 increases the rotational speed of the flyer 2 to the predetermined rotational speed during steady operation. In addition, the bobbin rotation speed is also increased to a predetermined speed with respect to the number of wound roving layers at the time point based on the flyer rotation speed. Then, the steady operation is performed thereafter. In other words, until the weight of the roving bobbin reaches the value at which the flyer rotation speed during normal operation does not rise, the machine base is operated at a speed at which the empty bobbin does not rise, so the bobbin is prevented from rising. To be done.

For example, as spinning conditions, 100% cotton, spun roving weight 250 gelen / 30 yards, flyer steady rotation speed 1300 rpm, flyer low rotation speed 300 rpm.
When m. is input, the flyer rotation speed is 1300.
The roving weight required for winding the roving is 50 g so that the bobbin does not float up even at rpm. The spun roving weight is 250 pellen / 30 yards, and 1 g is 15.43 gelene. Therefore, the spun roving length corresponding to the roving weight of 50 g is X.
The following formula is established in terms of yards.

X [yard] × (250/30) = 50 ×
15.43 [Gelene] Therefore, X = 92.6 yards = 84.7 m. Under this spinning condition, low-speed operation with a flyer rotation speed of 300 rpm is performed until the spinning roving length reaches 84.7 m. Then, after the spun roving length reaches 84.7 m, the flyer rotation speed is shifted to a steady operation of 1300 rpm.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG. This embodiment is different from the above embodiment in that the flyer rotation speed is controlled in response to an increase in the winding roving layer, that is, an increase in the roving winding bobbin weight even during low speed operation.

During operation of the roving frame, the bobbin rail 6 is first raised. When the bobbin rail 6 is raised, the bobbin B does not lift from the bobbin wheel 7 even if the weight of the roving bobbin is light. Therefore, the floating of the bobbin B becomes a problem when the bobbin rail 6 is lowered, that is, when the even-numbered layer of the winding roving layer is wound. In this embodiment, basically, when the first layer and the second layer are wound, the roving machine is operated at a flyer rotational speed that does not cause the bobbin to lift up corresponding to the roving winding weight when the winding of the first layer is completed. . Also, the third
When the first layer and the fourth layer are wound, the roving machine is operated at a flyer rotation speed that does not cause the bobbin to lift up corresponding to the roving winding weight when the third layer is completely wound.

The CPU 29 calculates the number of winding roving layers from the spinning conditions input before the start of operation until the roving winding weight at which the bobbin is not lifted at the flyer steady rotation speed is reached. . Generally, the number of wound roving layers is five. Therefore, the CPU 29 calculates the roving winding weights at the completion of winding the first layer and the third layer, respectively, and the first flyer rotation speed and the second flyer rotation speed at which the bobbin corresponding to the weights does not rise. To calculate. Then, the rotation speed is stored in the work memory 32.

When starting the roving frame, the CPU 29 causes the flyer 2
Rotates at the first flyer rotation speed, and outputs a command signal to the motor drive circuits 36a to 36c so that the bobbin wheel 7 and the bobbin rail 6 have a predetermined speed corresponding to the flyer rotation speed. The main motor M and the winding motor 1
1 and the lifting motor 16 are driven at a predetermined speed through the inverters 10a to 10c.

The CPU 29 calculates the roving winding weight from the spun roving length when the winding of the first layer is completed, and compares the weight with the preset roving winding weight. If the weight is equal to or greater than the preset roving winding weight, the flyer rotation speed is controlled so as to be the same speed as when the first layer is wound even when the second layer is wound. When the weight does not reach the preset roving winding weight, the flyer rotation speed at which the bobbin corresponding to the weight does not float is calculated from the database. Then, when the second layer is wound, that is, when the bobbin rail 6 is lowered, the flyer rotation speed is changed from the preset first flyer rotation speed to the newly calculated rotation speed. Further, the rotation speed of the bobbin wheel 7 and the descending speed of the bobbin rail 6 are also changed to a predetermined speed corresponding to the rotation speed of the flyer.

When the winding of the second layer is completed, that is, when the bobbin rail 6 is lowered to a predetermined position, the flyer rotation speed is increased to the second flyer rotation speed by a command from the CPU 29. Further, the bobbin wheel 7 and the bobbin rail 6 are also shifted to a predetermined speed corresponding to the flyer rotation speed. Second
When the winding of the layers is completed, the CPU 29 calculates the roving winding weight from the spun roving length, and if the weight is less than the preset roving winding weight, the bobbin is lifted up corresponding to the weight. Calculate the flyer speed from the database. Then, when the fourth layer is wound, that is, when the bobbin rail 6 is lowered, the flyer rotation speed is changed to the newly calculated rotation speed. Then, when the winding of the fourth layer is completed, the flyer rotation speed is increased to the rotation speed during the steady operation, and the steady operation is performed from the winding of the fifth layer. Therefore, in this embodiment, the time required to reach the steady operation is shorter than that of the above embodiment, and the productivity is higher than that of the above embodiment.

It should be noted that the present invention is not limited to the above-described embodiments. For example, instead of inputting the flyer rotation speed during low speed operation in the first embodiment, a low speed corresponding to the input empty bobbin weight is used. CPU 29 for flyer speed during operation
May be requested. Further, when the flyer rotation speed is changed during low-speed operation at the initial stage of winding, as shown in FIG. 6, until the roving winding weight reaches a weight at which the bobbin B does not lift at the flyer rotation speed during steady operation, the winding of each layer is performed. The flyer speed may be increased each time the removal is completed. In addition, the spun roving length is constantly sampled,
It is also possible to calculate a flyer rotation speed that does not cause the bobbin B to float up corresponding to the spun roving length, and operate so that the flyer rotation speed is reached.

Further, instead of confirming that the predetermined roving winding weight has been reached with the spun roving length in the first embodiment, the spinning time until the predetermined roving winding weight is reached is calculated from the spinning speed, It may be confirmed by spinning time that the predetermined roving winding weight has been reached. Further, the relation between the flyer rotational speed and the roving winding bobbin weight, which does not cause the bobbin to lift up from the bobbin wheel when the bobbin rail is lowered, may be stored as an arithmetic expression instead of being stored in the working memory 32 as a database. In the roving machine, the bobbin rotation speed, the bobbin rail lifting speed, and the flyer rotation speed have optimum values corresponding to the number of winding roving layers, so the bobbin rotation speed, the bobbin rail lifting speed, and the flyer rotation speed are If one of them is decided, the other is decided almost uniquely. Therefore, instead of the relationship between the flyer rotation speed and the roving winding bobbin weight, the database may be created as the relationship between the bobbin rotation speed or the bobbin rail lowering speed and the roving winding bobbin weight.

Further, as a structure for changing the winding speed, a gear system for driving a long rack which uses a cone drum and interlocks with a belt shifter, such as a device disclosed in Japanese Patent Laid-Open No. 62-85036, is used as a motor. Alternatively, as the drive system of the roving frame, the drive system of the roving frame may be configured such that each drive system is independently driven by a motor without providing the differential gear mechanism 12.

[0035]

As described in detail above, according to the present invention, even when the machine base is sped up, the bobbin is prevented from being lifted up in the initial stage of winding, and the roving can be wound up neatly at the beginning of winding. At the same time, noise generation is reliably prevented. In addition, the life of the bobbin is extended.

[Brief description of drawings]

FIG. 1 (a) is a flowchart showing a procedure for setting a spun roving length for determining the speed-up timing of the flyer rotation speed in the first embodiment, and FIG. It is a flow chart which shows an operation.

FIG. 2 is a graph showing the change over time of the flyer rotation speed.

FIG. 3 is a schematic diagram of a drive system of a roving frame.

FIG. 4 is a block diagram showing an electrical configuration of a control device.

FIG. 5 is a graph showing the relationship between the flyer rotation speed and the winding roving weight in the second embodiment.

FIG. 6 is a graph showing a relationship between a flyer rotation speed and a winding roving weight in a modified example.

[Explanation of symbols]

2 ... Flyer, 6 ... Bobbin rail, 7 ... Bobbin wheel, 27 ... Control device as control part, 31 ... Input device as input means, B ... Bobbin.

Claims (2)

[Claims] 1. A roving machine capable of speed-changing the spinning speed, wherein the relationship between the operating speed and the weight of the roving bobbin that does not cause the bobbin to rise from the bobbin wheel when the bobbin rail is lowered in the initial stage of winding is obtained in advance. Every time, at least when the bobbin rail is descending, the winding method is performed at a speed equal to or lower than the operating speed at the start of winding in the roving machine. 2. In a roving machine capable of speed-changing the spinning speed, a database or a relation between an operating condition in which the bobbin is not lifted from the bobbin wheel when the bobbin rail is lowered and the weight of the roving bobbin or its corresponding amount is used. The weight of the roving bobbin is stored as an arithmetic expression in the control unit, and the predetermined weight of the roving bobbin or the amount corresponding to the roving bobbin that does not cause the bobbin to rise during the steady operation of the spinning condition input by the input means is obtained. The operating method at the start of winding in the roving machine, in which the winding operation is performed under operating conditions in which the empty bobbin does not lift up until the predetermined weight is reached.