JP2513335B2 - Method for controlling roving winding of roving machine - Google Patents

Description

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

[Prior Art] Generally, in a roving machine, a roving yarn sent from a front roller at a constant speed is twisted on the roving yarn due to a difference in rotation speed between a flyer rotating at a constant speed and a bobbin rotating at a higher speed. Wind it on a bobbin while hanging it. In order to keep the winding tension constant from the beginning of winding to the full tube at the time of winding, the bobbin drive system incorporates a speed change mechanism consisting of a pair of cone drums, and the belt wound between the cone drums is wound onto the bobbin. When the number of yarn layers increases, the bobbin is moved by a predetermined amount and the number of revolutions of the bobbin is controlled to be gradually decreased layer by layer. However, since the number of roving layers wound on the bobbin and the rate of increase in the bobbin diameter change depending on the spinning conditions such as the type of spun fiber, the spinning count, the rotational speed of the flyer, and the number of twists, In the cone drum, it is difficult to adjust the bobbin rotation speed so that the winding tension is constant from the beginning of winding to the full tube under all spinning conditions.

As a device for solving the above-mentioned inconvenience, Japanese Examined Patent Publication No. 52-48652
In the publication, a link mechanism that links a belt shifter that moves a belt wound between a pair of cone drums and a rack that is intermittently moved at a constant pitch as the roving layer wound on a bobbin increases is disclosed. It is disclosed that a guide plate having a cam surface that is connected via a cam surface and that engages with an engaging portion provided in a link mechanism is attached so that the position of the cam surface can be adjusted. In this apparatus, by changing the shape of the cam surface of the guide plate in response to the change in spinning conditions, it is possible to meet various spinning conditions while using the same cone drum.

Further, JP-A-62-8979 discloses a non-contact type roving position detecting device capable of continuously detecting the position of a roving extending between a front roller and a flyer top of a roving machine, and this roving. Means for calculating the tension state of the roving yarn based on the position signal of the roving yarn from the position detection device, and appropriate when the tension state of the roving yarn is not proper based on the calculation result and the preset value. As described above, there is disclosed a control device for the roving winding speed, which comprises a device for outputting a correction signal and a changing device for changing the bobbin rotation speed based on the correction signal.

[Problems to be Solved by the Invention] However, in the apparatus disclosed in Japanese Patent Publication No. 52-48625, one kind of cone drum can meet various spinning conditions. There is a problem in that the adjustment of the guide plate for forming the corresponding cam surface shape is troublesome.

Further, in the device disclosed in JP-A-62-8979, since the bobbin rotation speed is changed when the roving thread tension deviates from the proper state, fluctuations in the roving thread tension due to an increase in the roving thread layer occur. There is a problem that the tension needs to be corrected every time a layer change occurs, and the tension needs to be corrected frequently.

The present invention has been made in view of the above problems, and an object thereof is to be able to wind a roving yarn in an appropriate tension state from the beginning of winding the roving yarn to when the roving is fully filled, and to improve productivity. Therefore, even when the flyer rotation speed is changed and winding is performed, the roving winding control method of the roving machine can always perform winding of the roving in an appropriate tension state without frequently performing tension correction. To provide.

[Means for Solving the Problems] In order to achieve the above-mentioned object, in the present invention, a spindle is provided with a shifting means that can be driven to shift independently of a spinning drive system, and a preset bobbin diameter and bobbin rotation speed are provided. In the roving machine that controls the bobbin rotation speed based on the gear shift pattern, the tension detection device detects the tension state of the roving yarn and if the winding tension is not appropriate, the bobbin rotation speed is changed to correct the tension. The rotation speed detector calculates the bobbin rotation speed and the flyer rotation speed at that time in the proper tension state, and the bobbin diameter at that time is obtained from the calculated both rotation speeds based on the shift pattern, before the layer change and at that time. The amount of change in bobbin diameter is calculated from the difference in bobbin diameter, and the bobbin rotation speed after the next layer change is calculated based on the amount of change. As described above, the bobbin rotation speed is controlled to be changed.

[Operation] In the present invention, the bobbin diameter is increased and the bobbin rotation speed shift pattern is set so as to obtain an appropriate tension state corresponding to the spinning condition, and the bobbin rotation speed is controlled so as to follow the shift pattern. It The state of the winding tension of the roving is always detected by the tension detecting device, and the bobbin rotation speed is changed so that the winding tension is in an appropriate state. And
The rotation speed detector calculates the bobbin rotation speed and the flyer rotation speed at that time in the proper tension state, and the bobbin diameter at that time is calculated based on the shift pattern from both rotation speeds, before the layer change and at that time. The amount of change in bobbin diameter after the next layer change is calculated from the difference in the bobbin diameter of the next time, and the bobbin rotation speed after the next layer change is calculated based on the amount of change, and the layer change is performed at that speed. When it is broken, the bobbin rotation speed is controlled to change gears.

The pressure applied by the presser also changes due to the change in the rotational speed of the flyer, and the amount of increase in the bobbin diameter due to the increase in the roving layer due to the layer change also changes. However, since the amount of increase in the bobbin diameter at a certain point during winding is almost equal to the amount of increase in the bobbin diameter after the next layer change, under the winding conditions in which the flyer rotation speed is changed by the shift control described above. Also, the winding tension of the roving is maintained at an appropriate value,
The winding tension is corrected less frequently.

[Embodiment 1] An embodiment embodying the present invention will be described below with reference to FIGS. As shown in FIG. 2, the front roller 1 constituting the spinning drive system is arranged between one end of the front roller 1 and a driving shaft 3 which rotates integrally with a driving pulley 2 which is rotationally driven by a main motor M. It is adapted to be rotationally driven via the gear train 4. As the main motor M, a variable speed motor capable of variable speed driving via the inverter 5 is used. A driven gear 7 is integrally rotatably fitted and fixed to an upper portion of the flyer 6, and a driving gear 10 is fitted to a rotating shaft 9 to which the rotation of the driving shaft 3 is transmitted via a belt transmission mechanism 8. It is designed to be rotated.

On the other hand, a rotary shaft 13 to which a drive gear 12 meshing with a driven gear 11a of a spindle 11 mounted on a bobbin rail (not shown) is fitted and fixed, through a rotational force of the driving shaft 3 and an inverter 14. Variable speed motor driven at variable speed
The rotational force generated by 15 is combined by the differential gear mechanism 16 and transmitted. That is, the variable speed motor 15
The rotation of the drive shaft 17 driven by is input to the differential gear mechanism 16 via the gear train 18 and the belt transmission mechanism 19, and with respect to the belt transmission mechanism 20 disposed on the output side of the differential gear mechanism 16. The rotary shaft 13 is connected via a universal joint 21 and a connecting shaft 22. Also, the lifter rack 23 fixed to the bobbin rail 23
The rotation of the drive shaft 17 is transmitted to the rotary shaft 25 fitted with the gear 24 that meshes with the rotary shaft 25 via the switching mechanism 26 and the gear train 27. The switching mechanism 26 is connected to a molding device (not shown) and is operated in conjunction with the motion of the molding device to switch the engagement between the bevel gears 26a, 26b and the bevel gear 26c, thereby making the lifter rack 23, that is, the bobbin rail. The direction of the vertical movement of is changed.

A rotation speed detector 28 for detecting the rotation speed of the flyer 6 is provided near one of the toothed pulleys 8a constituting the belt transmission mechanism 8, and a rotation speed of the spindle 11, that is, the bobbin B is provided near the driven gear 11a of the spindle 11. Rotational speed detectors 29 for detecting are respectively provided. A non-contact type tension detecting device 30 for detecting the tension state of the roving R is arranged between the front roller 1 and the flyer top 6a. As the tension detecting device 30, for example, a device having a configuration disclosed in Japanese Patent Laid-Open No. 60-146016 is used.

Next, an electric circuit for driving and controlling the main motor M and the variable speed motor 15 will be described with reference to FIG. The microcomputer 32 constituting the control device 31 includes a CPU (central processing unit) 33, a program memory 34 including a read-only memory (ROM) storing a control program, and an input device 35.
And a working memory 36 as a storage device including a rewritable and rewritable memory (RAM) for temporarily storing the input data input by the CPU 33 and the arithmetic processing result in the CPU 33, and the CPU 33 stores the program stored in the program memory 34. Operates on data.

The input device 35 for inputting the spinning conditions such as the spinning number, the number of twists, the bobbin diameter at the start of winding, and the draw ratio between the front roller and the bobbin to the working memory 36 is integrated into the control device 31 as a keyboard. Has been. The rotation speed detector
The detection signals from 28 and 29 are input to the CPU 33, and the tension detection device
The detection signal from 30 is input to the CPU 33 via the A / D converter 37. Further, in the vicinity of the cradle of the molding apparatus, a switching signal transmitting means 38 including a limit switch (not shown) is arranged at a position where it can be engaged with the cradle in correspondence with the switching of the bobbin rail up and down movement. The signal from the signal transmitting means 38 is input to the CPU 33. The CPU 33 drives and controls the main motor M via the output interface 39, the motor drive circuit 40 and the inverter 5 based on the spinning conditions input by the input device 35. or,
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 corresponds to the output signal of the switching signal transmission means 38.
The variable speed motor 15 is drive-controlled via the motor drive circuit 41 and the inverter 39.

Next, the operation of the device configured as described above will be described.
Prior to driving the machine base, first, the spinning number, the number of twists T, the bobbin diameter d ₀ at the start of winding (the diameter of the empty bobbin), the spinning ratio K between the front roller 1 and the bobbin, and other spinning conditions, A shift pattern indicating the relationship between the bobbin diameter and the bobbin rotation speed as shown in FIG. 4, shift conditions of the main motor M, and the like are input by the input device 35. Then, when the machine base is driven, the main motor M is speed-changed 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 a high speed in the initial stage 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 in the initial stage of winding, and then gradually decelerated.

When the driving shaft 3 is driven to rotate together with the driving pulley 2 by the driving of the main motor M, the front roller 1 passes through the gear train 4 and the belt transmission mechanism 8, the rotating shaft 9, the driving gear 10 and the driven gear 7. Flyer 6
Are driven to rotate. Then, the rotation speed detector 28
Accordingly, the rotation speed of the flyer 6 is detected and input to the CPU 33. At the same time that the main motor M is driven, the variable speed motor 15
The rotary shaft 25 is driven via the drive shaft 17, the switching mechanism 26, and the gear train 27 to drive the lifter rack 23. On the other hand, the rotational force input to the differential gear mechanism 16 via the drive shaft 17, the gear train 18, and the belt transmission mechanism 19 and the rotational force of the driving shaft 3 are combined by the differential gear mechanism 16, and the combined rotation is generated. The rotary shaft 13 is driven by the force via the belt transmission mechanism 20, the universal joint 21 and the connecting shaft 22, and the spindle 11
Is driven to rotate. That is, the main driving force of the rotating shaft 13 is given from the driving shaft 3, and the driving force for shifting due to the increase of the roving layer wound on the bobbin B is given by the variable speed motor 15. Further, the rotation direction of the rotary shaft 25 that drives the lifter rack 23 is such that the roving R relative to the bobbin B is
Each time one winding of the
It is changed by switching the meshing of 26a, 26b and the bevel gear 26c.

Further, a signal indicating the tension state of the roving yarn R is input to the CPU 33 by the tension detection device 30, and the CPU 33 judges from the signal whether or not the tension of the roving yarn R is in an appropriate state. First, the variable speed motor 15 is drive-controlled so that the rotation speed of the bobbin is changed so as to obtain an appropriate tension.

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

V = NS / T NB = HS + K · V / (πd) = NS + K · NS / (πdT) where V is the peripheral speed of the front roller, NS is the number of flyer revolutions, T is the number of twists, and d is the bobbin diameter. K is a constant (drawing ratio between the front roller and the bobbin).

Therefore, the bobbin diameter d is expressed by the following equation, which is a modified equation.

d = {NS / (NB-NS)} / {K / (πT)} ... Then, the CPU 33 drives and controls the variable speed motor 15 from the beginning of winding to the full tube according to the flowchart of FIG. That is, when the tension of the roving R is appropriate, the rotation speed detector
The flyer rotation speed NS and the bobbin rotation speed (winding rotation speed) NB are calculated based on the signals from 28 and 29, and the current bobbin diameter d _n is calculated from the equations based on the calculated values. Next, the current bobbin diameter d _n and the bobbin diameter d _n at the time of winding before layer change
_The amount of increase in bobbin diameter Δd due to the layer change from _n-1 is Δ
calculated from _{d = d n -d n-1} . And the current bobbin diameter d _n
Then, the bobbin rotational speed NB after the next layer change is calculated from the following equation by using the increase amount Δd of the bobbin diameter and the flyer rotational speed NS.

NB = NS + KNS / {π (d _n + Δd) T} Then, it is confirmed by the signal from the switching signal transmitting means 38 that the layer change has been performed, and at the same time, the variable speed motor 15
Is driven in a variable speed to reduce the bobbin speed NB to the above value. The amount of increase in bobbin diameter Δd and the value of flyer rotation speed NS are not the values after layer change, but the amount of increase in bobbin diameter Δd and the number of flyer rotations during the further increase of the roving layer
Since the amount of change in the value of NS is small, even if the previous amount of increase Δd in the bobbin diameter and the value of the flyer rotation speed NS are used, the error is small and there is no problem. In the same manner, every time a stratum change is performed, the bobbin rotation number NB after the next stratum change is calculated, and the variable speed motor 15 is shift-controlled for each stratum change.

That is, in the method of the present invention, since the proper bobbin rotation speed after the layer change is calculated in advance and the bobbin rotation speed is controlled to be the value together with the layer change, the feedforward control is performed, and after the layer change like the conventional device, Compared to the feedback control that detects when the roving yarn tension deviates from the proper state and shifts the bobbin rotation speed so as to bring it into the proper state, the chance that the roving yarn tension deviates from the proper state decreases. Moreover, even if the roving tension deviates from the proper state, the correction amount is small, and proper winding is performed from the start of winding to the time of full filling. And
This is particularly effective when winding is performed by changing the number of rotations of the flyer in order to improve productivity as in this embodiment.

When the machine is operated at a constant spinning speed in a low speed range where the centrifugal force has a small effect on the roving, the rotation speed NS of the flyer 6 is constant, so the rotation speed detector 28 rotates the flyer 6 There is no need to measure speed.

[Second Embodiment] Next, a second embodiment will be described with reference to FIG. Although the spinning drive system, the drive system of the bobbin B, and the drive system of the bobbin rail are configured to be mechanically connected and driven in the apparatus of the embodiment, the spinning drive system is used in the apparatus of this embodiment. The system, the bobbin drive system, and the bobbin rail drive system are driven by separate motors. A rotary shaft 13 that drives the spindle 11 is connected to a drive shaft 17 that is driven by the variable speed motor 15 via a universal joint 42 and a connecting shaft 43. Further, the rotary shaft 25 that drives the lifter rack 23 is connected through gears 45 and 46 to the output shaft of a reversible variable speed motor 44 that is variable-speed driven through an inverter 14 and is capable of forward and reverse rotation drive.

Therefore, the device of this embodiment does not have the differential gear mechanism 16, and the reversible variable speed is used instead of the switching mechanism 26 including the bevel gears 26a, 26b and 26c as the switching mechanism for switching the lifting movement of the lifter rack 23. Since the motor 14 is used, the structure is simple and maintenance work is easy. Even with the same spinning count, the hardness of the roving R differs depending on the sliver raw material, and the degree of deformation when wound on the bobbin is different. Therefore, the rotating shaft 25 is driven at a rotational speed suitable for the raw material. As described above, the change gear needs to be replaced, but in the case of this embodiment, the change gear need not be replaced even when the spinning material is changed. Further, since it is not necessary to provide the differential gear mechanism 16 and the switching mechanism 26, the structure is simple and the maintenance work is easy.

The present invention is not limited to the above-mentioned embodiment, and instead of the variable speed motor 15 as means for changing the rotation speed of the spindle 11, that is, the bobbin, a pair of cone drums are used and wound between the cone drums. A structure in which the position of the belt is adjusted by a belt shifter is adopted, a rotation speed detector 28 for detecting the rotation speed of the flyer 6 is arranged near the driven gear 7, and the rotation speed of the front roller 1 is set. May be detected and the rotation speed of the flyer 6 may be calculated from the detected value.

[Effects of the Invention] As described above in detail, according to the present invention, the proper bobbin rotation speed after the layer change is calculated in advance for each layer change, and the feed rate is controlled so that the bobbin rotation speed becomes the value together with the layer change. Since the forward control is performed, the chances that the roving thread tension deviates from the proper state are reduced, and even when the flyer rotation speed is changed and winding is performed to improve productivity, the tension is not frequently corrected, It is possible to wind the roving yarn in an appropriate tension state from the beginning of winding the yarn to the time of full filling.

[Brief description of drawings]

1 to 4 show a first embodiment embodying the present invention. 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 1, flyer 6, main motor M, spindle 11, variable speed motor 15, differential gear mechanism 16, rotational speed detectors 28, 29, tension detecting device 30 constituting a spinning drive system. , Control device 31, roving R.

Claims (1)

(57) [Claims] 1. A rough spinning machine, comprising a speed change means capable of speed-changing a spindle independently of a spinning drive system, and controlling the bobbin rotation speed based on a predetermined speed change pattern of bobbin diameter and bobbin rotation speed, When the tension state of the roving is detected by the tension detection device and the winding tension is not appropriate, the bobbin rotation speed is changed to correct the tension, and the rotation speed detector detects the bobbin rotation speed and The flyer rotation speed is calculated, the bobbin diameter at that time is obtained from the calculated both rotation speeds based on the shift pattern, the change amount of the bobbin diameter is obtained from the difference between the bobbin diameter before the layer change and at that time, and the change A method for controlling the roving winding of a roving machine, in which the bobbin rotation speed after the next layer change is calculated based on the amount, and the bobbin rotation speed is controlled to change to that speed