JPS623736B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for winding glass fibers in a forming winder that continuously winds glass fibers by alternately using two spindle collets, particularly a forming winder of a full winding automatic switching type. Conventionally, forming winders have been used to wind glass fibers, and are equipped with a spindle collet for winding glass fibers, a spindle drive/control unit, a yarn guide device, a traverse device, etc. A forming winder of a full-open automatic switching type is used to carry out the winding, and is equipped with at least two of the above-mentioned spindle collets and a collet reversing device that sequentially positions these collets at the winding position. ing. To explain one example of this forming winder of automatic full-volume switching system, as shown in Figs. They are arranged symmetrically with respect to the center of rotation, and when one winding collection 1 reaches full winding, a full winding signal is issued and the turret 3 automatically moves in the direction of the arrow.
Rotate 180 degrees, move one winding collet 2 to the winding position, and then wind up.
During this time, the rolled up cheese can be removed from the winding drum 1. Second
The figure shows the state just before the switching of the winding collections 1 and 2 is completed by reversing the turret 3. During the changeover before moving to the take-up position, the strand 7 is guided by the thread guide bar 6 to the waste winding parts (front caps) 4 and 5 attached to the tips of the winding collects 1 and 2, respectively, and the strand 7 is guided to the turret. During the 180° rotation in step 3, waist winding is performed on the waist winding section 4, and after the rotation is completed, a very short waist winding is performed on the waist winding section 5, and then the strand 7 is transferred to the winding collet 2 on the thread guide bar. 6, and the original winding is resumed. By the way, in the above switching, the strand 7 is reliably wound around the weight winding part 5 of the empty winding collet 2 brought to the winding position, and then the strand 7 is wound between the waste winding parts 4 and 5.
must be cut securely. The operation during this time will be explained in detail as follows. Immediately before the aforementioned rotation of the turret 3 starts, the drive motor of the empty take-up collection 2 is started, and during the rotation of the turret 3, a run-up operation of the take-up collection 2 is performed, and when the reversal of the turret 3 is completed, A predetermined winding speed is reached. On the other hand, the winding collet 1, which has become fully wound, winds the strand 7 around the waste winding section 4 at a predetermined winding speed, and rotates around the center O of the turret 3 from the position shown in Fig. 3-1. When the winding collet 1 is moved from the position shown in Fig. 3-2 to the inverted position where γ=180°, the power to the drive motor of the winding collet 1 is briefly cut off and braking is applied. Therefore, as shown in FIG. 4, while the winding speed of the strand 7 in the waste winding section 4 is decelerated due to the braking, the circumferential speed of the waist winding section 5 is rapidly increased. When the reversal is completed, the winding speed is maintained at a predetermined winding speed of, for example, about 3,000 m/min.
Then, in the intermediate process when the rotation has progressed to a certain extent, the third
- As shown in Figure 2, the strand 7 comes into contact with the waste winding part 5, and the contact angle α gradually increases, and after the reversal is completed, the strand 7 contacts the waste winding part 5 due to the difference in winding speed between the waste winding parts 4 and 5. As a result, the tension between the waist windings 4 and 5 decreases, causing slack. The thickness of the bundled single yarn of strand 7 is, for example, about 13μ, and the number of bundled yarns is 400.
In the case where the slack strands 7 are of the same size, the slack strands 7 are lifted up by the annular air current that is formed around the waist winding portion 5 as it rotates at high speed, and the contact angle further increases (see Fig. 4). reference). When the frictional force acting between the strand 7 and the surface of the waist winding section 5 increases in this way, the strand 7 comes to wrap around the entire circumference of the waist winding section 5. At this point, the waist winding section 4, which was braked earlier, has come to a complete stop, so a large tension will act on the strand 7 that is stretched between the waist winding sections 4 and 5. The tension causes the strands to tear. In reality, before the strand 7 is torn off by such a simple tensile stress, the strand 7 wraps around the waist winding part 5 and is suddenly bent at an acute angle, so that the bending stress acts shockingly. It is often severed due to In any case, the switching method in which the glass fiber strand is continuously wound from a full winding collet to an empty winding collet by the above-mentioned operation has been conventionally used, so-called waste roller winding. It is a method. Recently, when winding glass fiber, the thickness of the single yarn has been increased to, for example, 23μ, and on the other hand, there are many cases in which strands, whose number of bundled strands is about the same as before, are wound using the above-mentioned forming winder. For example, if the winding speed is 1500 per minute
~800m and traditional speeds (e.g. ~2000m/min)
4500m), it is now considered to be considerably slower. Since winding has started to be carried out under such working conditions, a problem has arisen in which malfunctions occur during automatic switching to full winding, that is, mistakes in winding the empty winding collection onto the waist winding section. Therefore, a solution is desired. As a solution to this problem, for example, as shown in FIG. 5, immediately after the reversal is completed, a rotatably supported tension roller 8 is raised from below between the waist winding sections 4 and 5, and both waist winding sections are A winding method has been attempted in which the slightly slack strand 7 between the parts 4 and 5 is pushed up to forcibly increase the contact angle α at the waste winding part 5. If this winding method were to be applied to conventional equipment, the mechanism would be complicated, and the point where the winding method would be installed would be prone to attracting fluff from the glass fiber single yarn, which would increase the burden on maintenance. . This invention relates to the above-mentioned case where a waste roller winding method is used when a thick glass fiber single yarn is continuously wound at a low speed of about 1500 m/min to 800 m/min in a turret type forming winder. It is an object of the present invention to make it possible to eliminate the inconvenience without adding a mechanism having the above-mentioned drawbacks. These objects are achieved by the method of the present invention described below. That is, it has at least a pair of winding collections for glass fiber strands arranged symmetrically around the center of rotation of the turret, and when the winding of the strand by one of these winding collections becomes full, the The turret is rotated and fixed in order to move the other empty winding collet to the winding position while guiding the strand to the waste winding part attached to the tip of the winding collet and making it perform waist winding. In a method for winding glass fiber in a forming winder, in which continuous winding is performed by winding the strand at the waste winding part of a dry winding collet, and then winding the strand in succession at the waste winding part, one of the above-mentioned Immediately before the take-up collection becomes fully wound, the empty take-up collection is started, and during the rotation of the turret,
The circumferential speed of the empty winding collet is maintained at a level that sufficiently exceeds a predetermined winding speed, thereby applying a predetermined tension or more to the strand to stretch it, thereby thinning the strand and removing the air from the air. A forming winder characterized in that winding on a winding collet is facilitated, and the circumferential speed of the empty winding collet is made to match a predetermined winding speed almost simultaneously with the stop of the full winding collet. This is a method of winding glass fiber. An embodiment of an apparatus for carrying out the method of the invention will be described below with reference to the drawings. Prior to this explanation, we will explain that the thickness of the single glass fiber yarn is, for example, 23μ and the conventional thickness (for example, 13μ).
A strand that is approximately twice as thick and has the same number of condensed strands (for example, 400 strands) as the conventional one, is wound at a predetermined winding speed (1,500 to 800 m/m/m), which is much lower than the conventional method.
If we consider the cause of the error in the winding operation of the empty winding collet to the waste winding part when switching to full winding when continuous winding is performed at a speed of ,
It can be mentioned that the contact angle of the strand 7 at the waste winding 5 is considerably smaller than in the case of conventional strands. This is because the circumferential speed of the waist winding part 5 is conventionally high at 2000 m/min or more, but in this case it is suppressed to 1500 m/min, so the annular air flow formed around the waist winding part 5 is weaker than in the conventional case, and furthermore, the weight per unit length of the strand 7 is about three times heavier than the conventional one if each has the above-mentioned thickness, and the circumferential speed between the waste winding parts 4 and 5 is This is thought to be based on the fact that since the difference between the two is smaller than that in the conventional case, the slack due to the decrease in the tension of the strand 7 that is stretched between the two is smaller than that in the conventional case. Therefore, as a countermeasure for this, a strong annular air current is formed around the waist winding part 5 at the time of full winding change, and the difference in circumferential speed between the waist winding parts 4 and 5 is compensated for by the waist winding part 5. 5
The unit of the strand 7 is made larger by increasing the circumferential speed of the strand 7, and further, the strand 7 is temporarily accelerated by the waste winding part 5 to apply a tension of more than a predetermined amount to it to partially stretch the unit of the strand 7. The weight per length can be reduced. All three of these can be achieved by controlling the rotation of the drive motor using a control device so that the empty take-up collet 2 is rotated at a high circumferential speed of at least 2000 m/min when switching to full winding. This is the gist of this invention. FIG. 6 is an operation time chart of each main mechanism and device in an embodiment of the apparatus for carrying out the method of the present invention. In this case, it is assumed that the strand is composed of 400 glass fiber single yarns of 23μ wrapped around each other, and the predetermined winding speed is 800 m/min. In the figure, , are diagrams showing the rotational states of the winding collets 1 and 2, respectively, the scale on the left side represents the winding speed or circumferential speed of the winding collet (waste winding part), and the scale occupied by the thread guide bar 6 The letter B on the left indicates that the thread guide bar 6 is at the rear, that is, in the guide position for regular winding, and the letter F indicates that it is in the front, that is, the guide position for waste winding. The expression indicates the rotating state of the turret 3, and the letters R and L on the left side are focused on the empty take-up collect 2 and represent the right and left positions occupied by it, respectively.

【formula】

[Formula] indicates the operating status of the brakes on the rotating shafts of the winding collects 1 and 2, and ON on the left side represents the braking state, and OFF represents the releasing state. Note that t at the top is a time diagram showing the passage of time, and t1, t2, and t3 are the time when the winding collection 1 is fully wound, the time when the turret 3 is reversed, and the normal winding time of the empty winding collection 2. The respective winding start points are shown. In this time chart, except that the winding speed is kept low at 800m/min...

【formula】

[Formula] is the same as in the conventional device,
The only difference is Therefore, the operation sequence program in the conventional device was modified so that the following rotational operation was performed on the idle winding collection 2, and the drive motors of the winding collections 1 and 2 and their control devices were changed. All you have to do is configure it to work as per this modified program. The respective operations of the winding collects 1, 2, turret 3, thread guide bar 6, etc. according to the individual time charts shown in FIG. 6 are clear from what has already been explained, and the explanation thereof will be omitted. The reason why 1 is included in the above-mentioned winding collection is that when one of the winding collections 1 and 2 is winding, the other is in a full winding state or in a standby state, and the two are alternately replaced. . The motors directly connected to these winding collects 1 and 2 are conventional 3-phase induction motors with a number of poles of 2, for example.
It starts with a phase alternating current power supply, and after the start-up is completed, it is automatically connected to a thyristor inverter for speed control, and the frequency is set to a maximum of 110 Hz or 120 Hz, depending on the winding diameter, by said inverter. The winding speed (circumferential speed of the waste winding section in the case of an empty winding collet) can be maintained at a desired constant speed in the range of 2500 to 5500 m/min, for example, and winding can be carried out. It is something that Therefore, in this device, only the motor with four poles is used, and the circumferential speed of the waist winding section is adjusted to the time chart using the same control device as the conventional one, for example, from 800 to 2000 m/min. It is possible to hold a predetermined set value within a range and rotate it. Now, according to the results of operation using the above-mentioned device for carrying out this winding method, the strand was wound well around the waist winding part of the empty winding collet, and the strand became a thin thread for a very short period of time. However, this is not a problem because it is all wound as waste yarn, and it does not occur in the past when switching to full winding under winding conditions where the glass fiber single yarn is thickened and the winding speed is much lower than before. It was confirmed that this method can eliminate operational errors. As is clear from the above explanation, according to the method for winding glass fiber in the forming winder according to the present invention, for example, 1500 to 800 m/
When winding a strand that needs to be wound at a winding speed as low as 2000 m, the circumferential speed of the idle winding collet must be set to a value well above the predetermined winding speed (for example, 2000 m /min)
By holding it at a high speed, a strong annular airflow can be formed around the waist winding, reducing the tension in the strand stretched between both waist windings, and effectively eliminating slack in the strand. By temporarily accelerating the strand, it is possible to partially stretch the strand and reduce the weight per unit length of the strand. It becomes possible to increase the winding speed and reliably wind the strand around it, and automatic switching can be performed without mistakes during winding at low winding speeds.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the main parts of a conventional full-volume automatic switching type forming winder, Fig. 2 is a perspective view showing the state of the winding collet at the time of switching, Figs. Figures 3-2 and 4 are explanatory diagrams showing the behavior of the strand between both waste windings when switching to full winding, and Figure 5 shows the contact of the strand to the waist winding of the empty winding collet when switching to full winding. FIG. 6 is an explanatory diagram showing an example of a mechanism for enlarging the angle, and FIG.
This is the operating time chart of the device. 1, 2... Winding collect, 3... Turret,
4, 5... Waist winding section, 6... Thread guide bar, 7... Strand, O... Rotation center of turret.

Claims (1)

[Claims] 1 At least a pair of winding collections for glass fiber strands are arranged symmetrically around the center of rotation of the turret, and when the winding of the strand by one of the winding collections becomes full, the winding The strand is guided to the waste winding section attached to the tip of the take-up collet, and while the strand is being waist-wound, the turret is rotated and fixed in order to move the other empty take-up collection to the winding position. In a method for winding glass fiber in a forming winder, in which continuous winding is performed by winding the strand at the waist winding part of a winding collet, and then winding the strand at the waist winding part of the winding collet, Immediately before the take-up collet becomes fully wound, the dry take-up collet is started, and during the rotation of the turret, the circumferential speed of the dry take-up collet is made to sufficiently exceed a predetermined winding speed. The size of the strand is maintained at the same size, thereby applying a tension above a predetermined value to the strand to stretch it, making the strand thinner and making it easier to wind it around the empty take-up collection, and to make it easier to wind the strand around the empty take-up collection. A method for winding glass fiber in a forming winder, characterized in that the circumferential speed of the idle winding collet is made to match a predetermined winding speed almost simultaneously with stopping.