JP3279106B2 - The yarn switching method in the traverse group control type yarn winding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn switching method in a traverse group control type yarn winding method for simultaneously controlling a plurality of weight traverse devices via one inverter.

[0002]

2. Description of the Related Art Generally, in a method of winding a yarn in a synthetic fiber manufacturing process, the yarn is wound up so as to form a drum-shaped yarn layer package while traversing the yarn axially left and right with respect to a bobbin. As shown in FIG. 5, the traverse speed in the yarn winding process is such that the maximum value is present in the middle of the winding process, and the speed is gradually increased from the lowest speed at the beginning of winding to the middle of winding. By changing the winding time (so-called traversing angle) between yarn layers by gradually changing the speed from the middle of winding to the end of winding, a solution for unwinding the yarn from the winding package can be changed. It has been found that the washability and handleability can be improved. (See Japanese Patent Application Laid-Open No. 3-216460.) As a means for changing the traverse speed with the passage of time as described above, the conventional winder employs a drive motor 1 (induction motor) of a traverse device for each weight as shown in FIG. ) Is connected to an inverter 2, and the inverter 2 and the control device 3 control the frequency of the supplied electricity to change the traverse speed. Each time each winding step is completed, the full bobbin is switched to an empty bobbin so that continuous winding can be continuously performed.

However, as is well known, an inverter is an extremely expensive device, and as shown in FIG. 1, a single inverter 2 is connected to (a driving motor 1 of) a plurality of traverse devices (four weights). There are attempts to do so. However, as described above, the drive motor 1 of the traverse device having a plurality of weights is connected to one inverter 2 and the traverse speed is reduced as shown in FIG.
When the group control is performed as in the program described above, there is a disadvantage that when the yarn is switched between a plurality of weights each time one winding process is completed, the yarn breakage is likely to occur.

[0004] That is, because of the capacity of the power supply (converter) for driving the spindle of the winder, it is not possible to simultaneously switch the yarns of a plurality of spindles, and the spindles must be switched one by one in order. For this reason, the weight that switches yarns in a later order is more likely to cause yarn breakage. FIG. 4 shows a situation in which a plurality of weights are thread-switched in a case where a single inverter controls a traverse device of four weights. Because usually many cases the traverse speed V _f of the fully wound time is different from the minimum traverse speed V ₁ set in the winding start, first, the traverse speed V _f of the winding end to the minimum traverse speed V ₁ of the for winding start I have to switch. Simultaneously switched to the lowest speed V _1, and switch the thread of the first No.1 weight, then successively to switch yarn of each spindle of one weight from No.2 to No.4.

[0005] However, the first No. 1 spindle can smoothly switch the yarn because the traverse speed V is the minimum speed V ₁ , but the thread switching per one spindle takes a certain time t ₀ (for the winding machine). No.2, No.3, No.4
The time t ₀ ,
2 × t ₀ and 3 × t ₀ elapse, and during this time, the traverse speed V becomes V ₂ and No. 3 weight when the yarn of the No. 2 weight is switched as shown in FIG. V when changing the thread
_3, when the switching yarn No.4 spindle has speed increase respectively _{V 4 (V 1 <V 2} <V 3 <V 4).

However, the higher the traverse speed V at the time of thread switching, the greater the fluctuation of the tension at the time of thread switching from the full bobbin to the empty bobbin, so that the high tension tends to cause thread breakage. This makes the smooth continuous winding process difficult. Although the above description has been given of the case where the yarn is switched at every full winding, when a yarn break occurs during the winding process and the like and the yarn is switched in the middle, a plurality of spindle traverse devices are connected to one inverter. In this connection, not only the thread breakage weight but also all the plurality of weights must be thread-switched, which causes the same problem.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a yarn winding method in which a single inverter controls the traverse speeds of a plurality of traverse devices in a group, thereby enabling smooth yarn switching. It is to provide a method.

[0008]

In order to achieve the above object, according to the present invention, a plurality of weight traverse devices are connected to a single inverter, and the traverse speed of the plurality of weight traverse devices is reduced via the single inverter. In the yarn winding method in which the winding start of the yarn is set to the minimum speed, the speed is gradually increased during the winding and the speed is gradually reduced from the winding to the end of the winding, the yarn winding method includes: At the time of yarn switching or intermediate yarn switching when the winding machine has reached full winding, the traverse speed at the time of full winding or intermediate yarn switching is switched to the minimum speed at the start of winding, and this minimum speed is kept substantially constant. The full bobbin or the winding bobbin of the plurality of spindles is sequentially switched to the empty bobbin while maintaining the thread, and after the thread switching of the plurality of spindles is completed, the speed is increased from the minimum speed to perform the normal traverse group control. This The one in which the features.

As described above, in the yarn switching of the winding machine of the type in which a plurality of weights are traverse group controlled by one inverter,
Since the traverse speed was maintained at the minimum speed at the beginning of winding and all the multiple weights were thread switched,
Enables stable thread switching without causing thread breakage. Further, in the yarn switching of the present invention, when the traverse speed at the time when the winding in the previous process is fully wound is switched to the minimum speed at the start of winding in the next process, the switching is performed at a deceleration rate of 800 cpm per 30 seconds. Then, since the traverse speed can be switched to the lowest traverse speed in the next step without drastically reducing the thread tension, the thread switching of the first weight in the next step can also be stabilized.

Hereinafter, the yarn switching method of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a control system for a traverse device of a winding machine in which a yarn switching method of the present invention is performed. A traverse device is provided for each of the multiple weight winding machines, and a drive motor 1 is provided for the traverse device. In general, an induction motor is used as the drive motor 1. In this embodiment, a drive motor 1 for four spindles is connected to one inverter 2, and the inverter 2 is connected to a control device 3. Each inverter 2
Each drive motor 1 is controlled by a control signal from the control device 3.
The traverse speed is changed over time by controlling the frequency of the electric power supplied to the traverse speed.

That is, as shown in FIG. 5, the traverse speed V from the beginning to the end of the winding process in one cycle is set to the minimum speed V ₁ at the beginning of the winding, and the minimum speed V ₁
Hayashi increased from ₁ to winding course, is varied so as to gradually decelerate until traverse speed V _f of the winding end (full package) from its winding middle. By changing the traverse speed with time so as to draw a substantially mountain-shaped curve, the unwinding property and the handling property of the yarn of the winding package can be improved.

Two winding steps I and II which are successive in time series
During the period, the yarn is switched from the full bobbin wound up in the winding step I in the previous term to the empty bobbin wound in the winding step II in the next term. This thread switching is performed, for example, as shown in FIG.
This can be performed automatically by the method shown in FIG. FIGS. 3A and 3B show the case of a revolving type winder.
A pair of spindles 11 and 11 are attached at intervals of 80 °, and bobbins 12 and 12 are attached to each of them.
A traverse device 13 winds the package P on the upper bobbin 12 while traversing the yarn Y left and right by a traverse guide 13g. The pressing roller 14 applies a constant pressure to the package P being wound.

FIG. 3A shows a bobbin 1 in the winding process of the first half.
2 shows a state in which the package P wound up is full. When this full signal is input to the control unit, a yarn switching signal is output, and the yarn is switched to the empty bobbin 12 waiting on the lower side. That is, the control device issues a command to rotate the turret plate 10 by 180 ° as indicated by an arrow in response to the detection signal of full winding, and moves the full bobbin 12 downward as shown in FIG. The empty bobbin 12 is moved to a new winding position. Next, the yarn pulling guide 15 installed above a position corresponding to the outside of the end of the bobbin 12 moves toward the other end of the bobbin 12 (that is, in a direction perpendicular to the paper surface), and
During the movement, the yarn Y in the traverse is hooked and removed from the traverse guide 13g.

When the yarn Y is moved to the end of the bobbin 12 by the yarn moving guide 15, the yarn switching arm 16
Falls down, catches the yarn Y traveling between the empty bobbin 12 and the full bobbin 12, and pushes the yarn Y into a yarn holding groove (not shown) provided at the end of the empty bobbin 12. By this operation, the yarn Y is gripped and wound around the empty bobbin 12, and the full bobbin 1
The yarn Y for 2 is cut.

Next, when the yarn pulling guide 15 returns to the original position, the yarn Y returns to the original traverse area by the yarn tension, and is traversed again by being caught by the traverse guide 13g. It will be rolled up. In the present invention, when such a yarn switching operation is performed, the traverse speed is controlled as illustrated in FIG. That is, in the traverse speed curve shown in FIG. 2, I is the traverse speed curve of the former winding process, and II is the traverse speed curve of the next winding process. A plurality of weights (four weights) in which the traverse speed is group-controlled by one inverter during these two processes
The yarn switching of the winders No. 1, No. 2, No. 3, and No. 4 is sequentially performed as shown in FIG.

That is, in FIG.
Traverse speed V _f at which became fully wound in, because usually a rarely has the minimum speed V ₁ which is set for the next winding start, firstly until the minimum speed V ₁ of the for the winding-start Switch to decelerate. Then, in the state of maintaining a substantially constant traverse speed V to the minimum speed V ₁ of 4 weight (total weight), winder No.1, No.2, No.3, sequentially 1 No.4 At intervals of the time t ₀ by weight, the above-mentioned FIG.
The yarn is switched to the empty bobbin by operating as shown in (B).
These yarns each spindle switching, since the present invention performs while maintaining both the traverse speed V to the minimum speed V _1, can be smoothly performed without causing total weight yarn breakage.

[0017] These multiple weights (4 weight) all the yarn switching is completed, so as to shift the traverse speed V to traverse group control of the normal, continue to accelerated from the state of the minimum speed V _1, the next winding Perform the process. Also, when decelerating from traverse speed V _f at which became fully wound in year winding process I, to the initial speed of the next winding process (minimum speed V ₁ of the in winding process) is a conventional 4 If it is changed suddenly as in the example, a thread break may occur at the first thread switching of the weight. For this reason, as shown in FIG. 2, it is preferable to provide a smoothing time t _S for gradually reducing the speed to the minimum winding speed V ₁ in the next winding step.

It is preferable that the deceleration rate per 30 seconds of the traverse speed at the smoothing time t _S be 800 cpm or less. Also, the deceleration rate, as long as the minimum speed V ₁ of the traverse speed V _f and the winding start of the winding end does not match, as much as possible it is desirable close to zero. By gradual deceleration rate when such transition from traverse speed V _f of the winding end for the lowest speed V ₁ of the winding start, without generating slack in the yarn Y, the first of the next winding process The thread switching of the No. 1 weight can be smoothly performed without causing thread breakage or the like.

For example, the initial minimum speed V ₁ in one winding step is set to 1315 cpm, the maximum traverse speed Vmax is set to 1715 cpm, and the smoothing time t _S when the traverse speed V _f at full winding becomes 1513 cpm is set. When 7.5 seconds (that is, the deceleration rate per 30 seconds was set to 792 cpm), the yarn was switched to the first No. 1 weight in the next winding step smoothly. However, when the smoothing time t _S was set to 7 seconds (that is, the deceleration rate per 30 seconds was 849 cpm), thread breakage occurred and thread switching was impossible.

Further, the initial minimum speed V ₁ is set to 2813 cp.
m, sets the maximum traverse speed Vmax to 3413Cpm, traverse speed V _f at fully wound is 2823cp
When the smoothing time t _S at the time of m is set to 60 seconds (that is, the deceleration rate per 30 seconds is 5 cpm), the yarn switching to the first No. 1 spindle in the next winding process is extremely stable. Could be done in state.

The case where the present invention is applied to the yarn switching at every full winding has been described above. However, the present invention is similarly applied to the case where the yarn is switched during the winding process when the yarn breaks during the winding process. be able to. Even when the present invention is applied to this intermediate yarn switching, the deceleration rate per 30 seconds of the traverse speed of the smoothing time t _S is 800 cpm.
It is preferable to set the following. For example, the first minimum speed V
₁ is 2525 cpm and the maximum traverse speed Vmax is 33
When set to 28 cpm, the traverse speed V when the yarn breakage occurs halfway is the same as the maximum traverse speed Vmax.
When a smoothing time t _S of 30 seconds (ie, a deceleration rate per 30 seconds of 800 cpm) was taken for an emergency stop when the speed was 328 cpm, the yarn to the first No. 1 spindle in the winding process to be performed again was executed. Switching could be performed stably.

[0022]

As described above, according to the present invention, in the yarn winding method for controlling the traverse speed of a plurality of traverse devices via one inverter in a group, the yarn switching or the intermediate yarn when the full winding is reached. At the time of switching, after switching the traverse speed at the time of full winding or at the time of intermediate yarn switching to the minimum speed at the start of winding, the yarns are sequentially switched for the plurality of spindles while maintaining this minimum speed substantially constant. In addition, yarn switching can be performed smoothly without causing yarn breakage due to abnormal tension in yarn switching of all weights.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a control system of a traverse device of a winder used in a yarn switching method of the present invention.

FIG. 2 is a graph showing an example of a traverse speed curve at the time of yarn switching in the yarn switching method of the present invention.

FIGS. 3A and 3B are side views showing an example of a winding machine to which the yarn switching method of the present invention is applied, wherein FIG. 3A shows a state immediately after full winding and FIG. Each time of switching is shown.

FIG. 4 is a graph showing an example of a traverse speed curve at the time of yarn switching in a yarn switching method not according to the present invention.

FIG. 5 is a graph illustrating a traverse speed curve over a plurality of winding steps.

FIG. 6 is a schematic diagram showing a control system of a traverse device of a conventional winding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive motor (of traverse device) 2 Inverter 3 Control device 12 Bobbin 13 Traverse device 13a Traverse guide

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 54/28 B65H 54/02

Claims (2)

(57) [Claims] A traverse device having a plurality of weights is connected to one inverter, and the traverse speed of the traverse device having a plurality of weights is set to a minimum speed at the beginning of winding of the yarn via the one inverter. Gradually increase the speed halfway through the winding,
In the yarn winding method in which the group is controlled so as to gradually decelerate from the middle of the winding to the end of the winding, in the case of the yarn switching when the winding machine of the plurality of weights reaches the full winding or the yarn switching during the winding, the full winding is performed. Alternatively, the traverse speed at the time of yarn switching in the middle is switched to the minimum speed at the start of winding, and the full bobbin or the winding bobbin of the plurality of weights is sequentially switched to the empty bobbin while maintaining the minimum speed substantially constant. After the yarn switching of the plurality of spindles is completed, the yarn switching method in the traverse group control type yarn winding method in which normal traverse group control is performed by increasing the speed from the minimum speed. 2. The traverse group control type yarn according to claim 1, wherein a deceleration rate per 30 seconds when the traverse speed at the time of full winding or at the time of yarn switching is switched to the minimum speed at the start of winding is 800 cpm or less. A yarn switching method in the winding method.