JPH03220325A - Method for controlling winding of roving of flyer frame - Google Patents

Abstract

PURPOSE:To carry out winding of roving while maintaining tension of roving to proper state, by operating proper number of revolution of bobbin after layer change every each layer change and controlling number of revolution of bobbin to the value together with the layer change. CONSTITUTION:State of winding tension of robing R is detected by a tension- detecting device 30 and rotation speed of bobbin B is changed so that winding tension becomes proper state. From rotation speed in proper tension state, bobbin diameter at the point of time is obtained based on the bobbin diameter and high speed pattern of rotation speed of bobbin and changed amount of bobbin diameter after next layer change is obtained from the difference of bobbin diameter between before layer change and the above-mentioned point of time and rotation speed after next layer change is calculated based on the changed amount and bobbin rotation speed in layer change is changed to calculated speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Second Industrial Fields] The present invention relates to a roving winding control method for a roving frame.

[Prior art] In general, in a roving machine, the roving fed out at a constant speed by a front roller is twisted into roving by the rotational speed difference between the flyer, which rotates at a constant speed, and the bobbin, which rotates at a higher speed. Wind it onto the bobbin while hanging it. In order to keep the winding tension constant from the beginning of the winding to the full tube during winding, a speed change mechanism using a pair of cone drums is incorporated into the bobbin drive system, and the belt wound between the cone drums is rotated around the bobbin. As the yarn layer increases, it is moved by a predetermined amount and the rotational speed of the bobbin is controlled to decrease sequentially for each layer. However, the number of roving layers wound around the bobbin and the rate of increase in the bobbin diameter vary depending on spinning conditions such as the type of spun fiber, spinning count, flyer rotation speed, and number of twists. In a cone drum, it is difficult to adjust the bobbin rotation speed so that the winding tension is constant from the beginning to the full tube under all spinning conditions.

As a device to eliminate the above-mentioned disadvantages,
Publication No. 2 discloses a link mechanism that connects a belt shifter that moves a belt wound between a pair of cone drums and a rack that is moved intermittently with a constant pinch as the number of roving layers wound around a bohin increases. A guide plate is disclosed in which a guide plate is connected via a link mechanism and has a cam surface that engages with an engaging portion provided on a link mechanism, and is attached so that the position of the cam surface can be adjusted. In this device, by changing the shape of the cam surface of the kite plate in response to changes in spinning conditions,
It becomes possible to correspond to various spinning conditions while using the same cone drum.

Furthermore, Japanese Patent Application Laid-Open No. 62-8979 discloses a non-contact type roving position detecting device capable of continuously detecting the position of the roving extending between the front roller of the roving machine and the flyer.
A means for determining the tension state of the roving yarn based on the position signal of the roving yarn from the roving yarn position detection device, and a means for determining the tension state of the roving yarn based on the calculation result and a preset value when the tension state of the roving yarn is not appropriate. discloses a roving winding speed control device comprising means for outputting a correction signal so as to be appropriate, and a changing device for changing the bobbin rotation speed based on the correction signal.

[Problems to be Solved by the Present Invention] In addition, with the apparatus disclosed in the above-mentioned Japanese Patent Publication No. 52-48652, it is possible to cope with various spinning conditions with one type of cone drum. There is a problem in that it is troublesome to adjust the kite grate to obtain a cam surface shape that corresponds to the conditions.

In the device disclosed in Japanese Patent Application Laid-Open No. 62-8979, the bobbin rotation speed is changed when the roving tension deviates from the appropriate state, so the fluctuation of the roving tension is prevented by increasing the roving layer. Tension correction is required every time a layer change occurs,
There is a problem that tension correction must be performed frequently.

The present invention has been made in view of the above problems, and includes:
The purpose of this is to be able to wind the roving with the appropriate tension from the beginning of winding to the full tube, and to maintain the tension even when winding is performed by changing the flyer rotation speed to improve productivity. Always maintain proper tension without frequent corrections.
The second object is to provide a method for controlling the winding of roving in a roving frame, which is capable of winding roving.

Means for Solving the Two Problems J In order to achieve the above-mentioned object, in the present invention, a speed change means capable of driving the spindle at variable speed independently of the spinning drive system is provided, and a preset bobbin diameter and bobbin rotation are provided. In a roving machine that controls the bobbin rotational speed based on a speed change pattern, a tension detection device detects the tension state of the roving, and if the winding tension is not appropriate, the bobbin rotational speed is changed to correct the tension to the appropriate tension. , find the bobbin diameter at that point from the bobbin rotation speed in the appropriate tension state based on the speed change pattern, find the amount of change in the bobbin diameter from the difference between the bobbin diameters before and at that time, and then change the bobbin diameter next time based on that amount of change. The bobbin rotation speed after the layer change is calculated, and the bobbin rotation speed is controlled to maintain the calculated speed.

In the present invention, the bobbin diameter is increased and the speed change pattern of the bobbin rotational speed is set so as to achieve an appropriate tension state in accordance with the spinning conditions, and the bobbin rotational speed is controlled in accordance with the speed change pattern. Ru.

The state of winding tension of the roving is constantly detected by a tension detection device, and the bobbin rotation speed is changed so that the winding tension is in a proper state. Then, the bobbin diameter at that point is calculated from the bobbin rotation speed in the appropriate tension state based on the speed change pattern, and the amount of change in the bobbin diameter after the next layer change is determined from the difference between the bobbin diameters before and at that point. The bobbin rotational speed after the next layer change is calculated based on the amount of change, and when the layer change is performed, the bobbin rotational speed is controlled to be variable so as to achieve the calculated speed.

As the rotational speed of the flyer changes, the pressing force applied by the presser also changes, and the amount of increase in the bobbin diameter based on the increase in the number of roving layers due to the layer change changes. However, the amount of increase in the bobbin diameter at a certain point during winding is approximately equal to the amount of increase in the bobbin diameter after the next layer change, so under the winding conditions where the flyer rotation speed is changed by the speed change control described above, Therefore, the winding tension of the roving is maintained at an appropriate value, and the frequency of correcting the winding tension becomes less frequent.

Embodiment 11 An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 4. As shown in FIG. 2, a front roller 1 constituting a spinning drive system is disposed between one end thereof and a driving shaft 3 that rotates integrally with a driving pulley 2 that is rotationally driven by a main motor M. It is designed to be rotationally driven via a gear train 4. The main motor M is a variable speed motor that can be driven at variable speeds via an inverter 5. A driven gear 7 is fitted and fixed to the upper part of the flyer 6 so as to be able to rotate integrally with the driving shaft 3.
A rotating shaft 9 whose rotation is transmitted via a belt transmission mechanism 8
It is designed to be rotated via a drive gear 10 fitted to the.

On the other hand, a rotating shaft 13 on which a driving gear 12 that meshes with a driven gear 11a of a spindle 11 mounted on a bobbin rail (not shown) is fitted and fixed is connected to a rotating shaft 13 that receives the rotational force of a drying shaft 3 and an inverter 14. The rotational force by the variable speed motor 15 which is driven at variable speed through the differential toothed ffi machine 16
It is designed to be synthesized and transmitted by That is, the rotation of the drive shaft 17 driven by the variable speed motor 15 is input to the differential gear mechanism 16 via the gear train 18 and the belt transmission mechanism 19, and the belt disposed on the output side of the differential gear mechanism 16 A rotating shaft 13 is connected to the transmission a-top 20 via a universal joint 21 and a connecting shaft 22. Further, the drive shaft 17 is attached to the rotary shaft 25 which is fixed to the bobbin rail or fitted with a gear 24 that meshes with the lid rack 23.
rotation is transmitted through the changeover $1126 and one row of teeth 27. The switching Il tree 26 is connected to a forming device (not shown) and is operated in conjunction with the movement of the forming device to switch the meshing of the bevel gears 26a, 26b and the bevel gear 26c, thereby controlling the lifter rack 23, that is, the bobbin The direction of the vertical movement of the rail is changed.

One toothed boo J8a constituting the belt transmission Wh mechanism 8
A rotational speed detector 28 for detecting the rotational speed of the flyer b is disposed near the rotary speed of the flyer b, and a rotational speed detector 29 for detecting the rotational speed of the spindle 11, that is, the bobbin B, is disposed near the driven gear 11a of the spindle 11. There is. Additionally, a roving thread R is provided between the front roller 1 and the flyer top 6a.
A non-contact type tension detection device 30 is provided to detect the tension state. As the tension detection device 30, for example, a device having a configuration disclosed in Japanese Patent Application Laid-Open No. 146016/1984 is used.

Next, an electric circuit for driving and controlling the main motor M and the variable speed motor 15 will be explained with reference to FIG. The microcomputer 32 constituting the control device 31 is a CPU
(Central processing unit) 33, and a program memory 34 consisting of a continuous read only memory (ROM) that stores control programs.
, the input data inputted by the input device 35 and the CP
It consists of a working memory 36 as a storage device consisting of a readable and rewritable memory (RAM) that temporarily stores the arithmetic processing results etc. in the U33, and the CPL'33 operates based on the program data stored in the program memory 34. do.

An input device 35 for inputting spinning conditions such as the spinning count, the number of twists, the bobbin diameter at the start of winding, and the stretching ratio between the front roller and the bobbin into the working memory 36 is integrated into the control device 31 as a keyboard. It is. The detection signals from the rotation speed detectors 28 and 29 are input to the CPU 33, and the detection signals from the tension detection device 30 are input to the A/D converter 37.
The information is input to the CPU 33 via the . Further, near the cradle of the molding device, there is a switching signal transmitting means 3 consisting of a limit switch (not shown) or the like at a position where it can engage with the cradle in response to switching the vertical movement of the bobbin rail.
8 is provided, and the signal from the switching signal transmitting means 38 is
It is designed to be input to PU33. The CPU 33 drives and controls the main motor M via the output interface 39, the motor drive circuit 40, and the inverter based on the spinning conditions input through the input device 35. Further, an appropriate bobbin rotation speed is calculated based on the output signals from the rotation speed detectors 28 and 29 and the tension detection device 30, and the output interface 39. The variable speed motor 15 is drive-controlled via the motor drive circuit 41 and the inverter 14.

Next, the operation of the apparatus configured as described above will be explained. Prior to driving the machine, first the spinning count, the number of twists T, and the bobbin diameter d at the start of winding are determined. (the diameter of the empty bobbin), the spinning conditions such as the drawing ratio between the front roller 1 and the bobbin, the speed change pattern showing the relationship between the bobbin diameter and the bobbin rotation speed as shown in FIG. 4, and the speed change of the main motor M. Conditions and the like are input using the input device 35. Next, when the machine is driven, the main motor M is driven at variable speeds via the inverter 5 according to the input conditions. In order to improve productivity and to prevent the centrifugal force accompanying the rotation of the flyer 6 during winding from adversely affecting the winding of the roving, the flyer 6 is rotated at high speed at the beginning of winding. It is preferable to gradually reduce the speed as the bobbin diameter increases. Therefore, the main motor M is driven at high speed at the beginning of winding, and then gradually decelerated.

When the driving shaft 3 is rotated together with the dry pin pulley 2 by the drive of the main motor M, the gear train 4
The front roller 1 connects to the flyer 6 via a belt transmission mechanism 8, a rotating shaft 9, a driving gear 10, and a driven gear 7.
are each driven to rotate. And rotation speed detector 2
8 detects the rotational speed of the fryer 6, and the CPU 33
is input. Further, at the same time as the main motor M is driven, the variable speed motor 15 is also driven, and the rotary shaft 25 is driven via the drive shaft 17, the switching 81126, and the gear train 27, and the lifter rack 23 is driven. On the other hand, the drive shaft 17, one row of teeth 18
The rotational force input to the differential gear mechanism 16 via the belt transmission mechanism 19 and the rotational force of the driving shaft 3 are combined in the differential gear mechanism 16, and the combined rotational force is used to connect the belt transmission mechanism 20 and the universal joint. The rotating shaft 13 is driven via the connecting shaft 21 and the connecting shaft 22, and the spindle 11 is rotationally driven. That is, the main driving force of the rotating shaft 13 is given from the driving shaft 3, and the driving force for changing the speed as the number of yarn layers increases on the bobbin B is given by the variable speed motor 15.
is given by Further, the rotation direction of the rotating shaft 25 that drives the lifter rack 23 is changed by the bevel teeth of the switching machine ellipse 26 every time the winding of the roving R on the bobbin B is completed.
26 The meshing between a26b and the bevel gear 26c is changed by switching.

Further, a signal indicating the tension state of the roving thread R is inputted to the CPU 33 by the tension detection device 30, and the CPU 33 judges from the signal whether the tension of the roving thread R is in a proper state, and if it deviates from the proper tension state. In this step, the variable speed motor 15 is controlled so that the number of revolutions of the bobbin is changed to obtain an appropriate tension.

The bobbin rotation speed NB during winding is given by the following equation.

V = N S / T...■ NB=NS+ -V/(πd) = N S + K-N S / (πdT>...■
Here, ■ is the circumferential speed of the front roller, NS is the flyer rotational speed, T is the number of twists, d is the bobbin diameter, and K is a constant (stretching ratio between the front roller and the bobbin).

Therefore, the bobbin diameter d is expressed by the following equation, which is a modification of equation (2).

d= (NS/(NB-NS)1.-'(K/iπT)
)...■ Then, the CPU 33 drives and controls the variable speed motor 15 from the beginning of the winding to the full winding according to the flowchart shown in FIG. That is, when the tension of the roving R is appropriate, the flyer rotation speed NS and the bobbin rotation speed (winding rotation speed) NB are calculated based on the signals from the rotation speed detector 28.29, and based on the values, the current Next, calculate the bobbin diameter increase Δd due to the layer change from the current bobbin diameter d and the bobbin diameter da-+ at the time of winding before the layer change, Δd=d, -d, Calculated from , . Then, the bobbin rotation speed NB after the next layer change is calculated from the current bobbin diameter d, the increase amount Δd of the bobbin diameter, and the flyer rotation speed NS using the following equation.

NB = NS = -NS/(π(d, +Δd)T) Then, when it is confirmed that the layer change has been performed by the signal from the switching signal transmitting means 38, the variable speed motor 15 is driven at variable speeds to rotate the bobbin. The speed is reduced to several NB or the above value. The values of the bobbin diameter increase Δd and the flyer rotation speed NS may not be the values after the layer change, or the changes in the bobbin diameter increase Δd and the flyer rotation speed NS are small while the roving layer increases further. Therefore, even if the previous values of the bobbin diameter increase Δd and flyer rotational speed NS are used, the error is small and will not cause any trouble. Thereafter, the bobbin rotation speed NB after the next layer change is similarly calculated every time a layer change is performed, and the speed of the variable speed motor 15 is controlled for each layer change.

That is, in the method of the present invention, the appropriate bobbin rotation speed after a layer change is calculated in advance and the bobbin rotation speed is controlled to that value along with the layer change, resulting in feedforward control. Compared to feedback control, which detects when the roving tension deviates from the proper state and controls the bobbin rotation speed at variable speeds to bring it back to the proper state, there are fewer chances for the roving tension to deviate from the proper state. Furthermore, even if the roving tension deviates from the proper state, the correction 1 is required less, and proper winding is performed from the start of winding to the time the tube is full. This is particularly effective when winding is performed by changing the flyer rotational speed in order to increase productivity as in this embodiment.

Note that when the machine is operated at a constant spinning speed in a low speed range where the influence of centrifugal force on the roving is small, the rotation speed NS of the flyer 6 is constant, so the rotation of the flyer 6 is determined by the rotation speed detector 28. No speed measurement is required.

``Example 2'' Next, a second example will be explained according to FIG. However, in the apparatus of this embodiment, the spinning drive system, bobbin drive system, and bobbin rail drive system are each driven by separate motors. The rotating shaft 13 is connected to a drive shaft 17 driven by the variable speed motor 15 via a universal joint 12 and a connecting shaft 43.The rotating shaft 25 that drives the lifter rack 23 is connected to the inverter 1. A reversible variable speed motor 4 capable of forward and reverse rotation driven at variable speeds via
It is connected to the output shaft of No. 4 via gears 45 and 46.

Therefore, in the apparatus of this embodiment, there is no differential gear a crown 16, and bevel gears 26a and 26b are used as a switching mechanism for switching the lifting and lowering movement of the lifter rack 23.

Since the reversible variable speed motor 44 is used in place of the switching mechanism 26 consisting of the switching mechanism 26c, the structure is simplified and maintenance work is also facilitated. In addition, even if the spinning count is the same, the hardness of the roving R will be different depending on the sliver raw material, and the degree of deformation will be different when it is wound on the bobbin. Although it is necessary to replace the change gear in order to drive the machine, in this embodiment, there is no need to replace the change gear even when changing the spinning raw material.

Further, since it is not necessary to provide the differential gear m mechanism 16 and the switching mechanism 26, the structure becomes simple and maintenance work becomes easy.

Note that the present invention is not limited to the above embodiments,
Instead of the variable speed motor 15, a pair of cone drums is used as a means for changing the rotation speed of the spindle 11, that is, the bobbin, and a belt shifter is used to adjust the position of the belt wound between the cone drums. Alternatively, a rotational speed detector 28 for detecting the rotational speed of the fryer 6 may be disposed near the driven gear 7, or the rotational speed of the front roller 1 may be detected and the rotational speed of the fryer 6 may be calculated from that value. You can also do this.

[Effects of the Invention] As detailed above, according to the present invention, the feed system calculates in advance the appropriate bobbin rotation speed after a layer change for each layer change, and controls the bobbin rotation speed to the value at the same time as the layer change. Since forward 1lJ11j is performed, there are fewer chances for the roving tension to deviate from the appropriate state, and even when winding is performed by changing the flyer rotation speed to improve productivity, the roving tension can be adjusted without frequent tension correction. The roving can be wound with appropriate tension from the beginning of winding to the time of full tube winding.

[Brief explanation of drawings]

1 to 4 show a first embodiment embodying the present invention, in which FIG. 1 is a flowchart, FIG. 2 is a schematic perspective view of a drive mechanism, and FIG. 3 is a block diagram of a control circuit. FIG. 4 is a diagram showing changes in bobbin diameter and bobbin rotation speed, and FIG. 5 is a schematic perspective view of the drive mechanism of the second embodiment. Front roller configuring the spinning drive system 1. flyer 6,
Main motor M, spindle 11, variable speed motor 15 constituting variable speed drive means. Differential tooth 1 mechanism 16, rotation speed detectors 28, 29, tension detection device 30, control device! 31, roving R
0

Claims (1)

[Claims] 1. In a roving machine that is equipped with a speed change means that can drive the spindle at variable speeds independently of the spinning drive system and controls the bobbin rotation speed based on a preset speed change pattern of the bobbin diameter and bobbin rotation speed, a tension detection device is used. The tension state of the roving is detected, and if the winding tension is not appropriate, the bobbin rotation speed is changed to correct the tension to the appropriate tension, and the bobbin diameter at that point is determined based on the bobbin rotation speed at the appropriate tension state based on the speed change pattern. The amount of change in the bobbin diameter is determined from the difference between the bobbin diameter before and at that time, and the bobbin rotation speed after the next layer change is calculated based on the amount of change, and the bobbin rotation is adjusted to that speed. A method for controlling roving winding of a spinning machine by variable speed control.