JPS612677A - Replacement of thread in spindle drive type automatic taking-up machine - Google Patents

Abstract

PURPOSE:To maintain the taking-up tension of a thread which forms the innermost layer part of a package within the equal range to a normal taking-up tension turning a turret after the speed of the complete winding side bobbin holder is increased when thread is to be replaced. CONSTITUTION:When a prescribed amount of a thread Y is taken-up and a completely wound bobbin P is formed, the control for the peripheral speed by a contact roller 7 is suspended, and the speed of a bobbin holder 1 on the complete winding side is increased by a predetermined rate. Prior to the speed increase, a bobbin holder 2 on the vacant bobbin side is in driven state, and a normal taking-up speed is achieved. After the speed of the complete winding side bobbin is increased, the fixation of a turret 3 is released, and the turret is revolved. Then, the package P is separated from the contact roller 7, and a vacant bobbin B revolves in contact with the contact roller 7, and thread is replaced. In this case, the speed reduction of the contact roller 7 is compensated by the speed increase of the bobbin holder 1, and when the thread contacts with the vacant bobbin B on the bobbin holder 2, nearly equal peripheral speed is set, and the taking-up tension is set within a proper range.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a spindle-type turret type (revolving type) automatic winding machine used in high-speed spinning or direct spinning and drawing of yarn, especially synthetic fiber yarn. This invention relates to a method for switching yarn to an empty bobbin when the bobbin is fully wound in a take-up machine.

[Prior Art] In recent years, from the viewpoint of automation, labor saving, and speeding up, a turret-type automatic winding machine that automatically switches the yarn wound onto a bobbin has been developed. It has come to be widely used in general melt spinning and winding processes. This type of winding machine was developed by the Special Publication Corporation 1986-2.
As shown in Japanese Patent Publication No. 5466 and Japanese Patent Publication No. 57-49462, various improvements have been made and have been put into practical use.
When high-speed winding exceeding L/min is required, spindle drive type winders have been reconsidered from the viewpoint of their functionality, and are now being put into practical use.

Generally, a spindle drive type automatic winder is equipped with a drive source to actively drive the bobbin (spindle), a contact roller that rotates in contact with the bobbin (package), and a device that detects its rotation speed. The drive source is controlled so as to keep the peripheral speed constant.

In such winding machines, when switching the yarn (bobbin), for example, a circuit is built in that temporarily interrupts circumferential speed control by the contact roller before or after rotating the turret. When switching the yarn by moving the positions of the first bobbin and the empty bobbin, when the first bobbin leaves the contact roller, its speed is increased to increase the winding tension, and the winding tension is increased and the winding tension is increased. Immediately after the empty bobbin comes into contact with the contact roller, the circuit is activated and peripheral speed control is performed. However, in this method, while the contact roller is separated from the first bobbin and comes into contact with the empty bobbin, it is in a free rotation state where it is not actively driven, so the speed during this time is significantly higher than the normal winding speed. If the contact roller comes into contact with an empty bobbin that has run up to normal winding speed in this state, the speed of the empty bobbin (side spindle) will drop sharply, making it impossible to perform stable yarn switching. there were.

To solve this problem, increase the run-up speed of the idle bobbin by some percentage compared to the winding speed so that the empty bobbin does not drop below the winding speed when it comes into contact with the contact roller. A method is used to ensure switchability.

However, this method also has the following problems.

That is, (1) when the run-up speed increase rate of the empty bobbin on standby is large, the contact roller speeds up rapidly after contact, and both reach the (normal) winding speed or higher. Therefore, the winding tension becomes higher than the normal winding tension, and then the winding speed is controlled by the contact roller and settles to the normal winding speed. At this time, the yarn quality of the innermost layer of the wound package is different from that of other parts, and there is a particular tendency to light dyeing, which poses a serious problem in terms of quality. (2) On the other hand, if the run-up rate increase rate of the waiting empty bobbin is lowered in order to suppress the winding tension in the innermost layer of the package to the normal winding tension level, the first winding bobbin will At the time when the yarn is switched from the empty bobbin to the empty bobbin, the contact roller has not reached the normal winding speed, and the winding speed of the empty bobbin has slowed down to below the winding speed, so the winding tension is significantly reduced, and the winding tension is significantly reduced. The return to the high horn is slow and switching performance is impaired.

In this case, it is conceivable to control the winding speed so that it reaches a normal winding speed when the empty bobbin and the contact roller come into contact with each other, but in reality, it is extremely difficult to do this well, and as will be described later, it is practically difficult.

In recent years, with the increase in winding speed, the higher the winding speed, the greater the speed reduction of the contact roller when switching the bobbin, and this problem is becoming more and more common due to the relationship between yarn switching performance and the yarn quality of the innermost layer of the package. It's getting bigger.

Purpose of the Invention The present invention has been made in view of the current situation, and it is an object of the present invention to maintain the winding tension of the yarn forming the innermost layer of the package within a range equivalent to the normal winding tension, and at the same time to achieve stable and reliable bobbin switching. The object of the present invention is to provide a spindle drive type yarn switching method that can be performed.

Structure of the Invention In order to achieve the above object, the present invention has the following structure.

That is, when automatically switching the yarn in a spindle drive type winder in which a plurality of bobbin holders are supported by a rotatable turret and the bobbin holders are rotated by a drive motor, the bobbin holder on the first winding side is This is a yarn switching method that uses a spindle drive type automatic winder that starts rotating the turret after increasing the speed.

Hereinafter, the present invention will be explained based on the drawings. FIG. 1 is a schematic perspective view of a spindle drive type automatic winder suitable for carrying out the present invention.

In the figure, 1 and 2 are bobbin holders (or spindles)
A bobbin (four-comb type in this example) is fitted into this.

The bobbin holder 1.2 is horizontally supported by the turret 1 (or turret arm) 3, and the support shaft (
(not shown) is driven by a motor 4 and rotated to perform thread switching.

The bobbin holders 1.2 are supported at a spacing of 1806, and their rear ends are connected to motors 5, 6 so that the individual bobbin holders can be rotated by driving the motors 5.6.

The bobbin holder 1 (2) is located above the bobbin holder 1 (2).
2) is provided with a contact roller 7 which is in contact with and is frictionally driven. The contact roller 7 contacts the bobbin holder (bobbin) during yarn winding to maintain the contact pressure at a predetermined level or to control the rotation speed of the bobbin holder (2), and is surrounded by a cover 8 as shown in the figure. . Further, a traverse box 10 having a traverse guide 9 for traversing the yarn is disposed substantially parallel to the position facing the contact row 57. The traverse box 10 is provided with a plate-shaped thread removal guide 11 located above the traverse guide 9 for pushing out the thread gripped by the traverse guide 9 and traversed toward the contact row 57 and removing the thread from the traverse guide 9. The thread is removed by operating a fluid pressure cylinder (not shown) and rotating the thread removal guide 11.

The contact roller 7 (cover 8) and the driver box 10 are connected at their rear ends to a slide block 13 that is supported so as to be movable up and down along two upright shafts 12, so that they move up and down in accordance with winding. It is like that.

14 is a bobbin holder (2) located on the side of the turret 3.
The thread hooks provided parallel to each other are guides and are arranged at intervals corresponding to the thread guard slits cut into the bobbin B in the rod-shaped holder 15. Further, the rod-shaped holder 15 is supported by an arm 17 connected to a rotary cylinder (actuator) 16, and by the operation of the rotary cylinder 16, the rod-shaped holder 15 is moved from a side position of the turret 3 to a position approximately in front of the center of the turret 3. It is configured to move to a position below the traverse box 10. This rotation end position is adjusted so that the straight line connecting the thread removal guide 11 at the thread removal position is at a position where the thread hook does not come into contact with the contact roller 7 during operation.

The thread guide 14 may be extendable or extendable as shown in Japanese Unexamined Patent Publication No. 57-62171.

Next, yarn switching of the winding machine will be explained.

The yarn melt-spun by a device (not shown) is traversed by a traverse guide 9 and wound around an empty bobbin B inserted into a bobbin holder 1 to form a package. At this time, the contact pressure is applied and the winding speed is controlled by the contact roller 7.
carried out by When the predetermined amount of yarn Y has been wound up and the first (full) bobbin (or package) P is wound as shown in FIG. The circuit is switched to increase the speed of the bobbin holder 1 on the winding side by a predetermined rate. As a result, the bobbin holder 1 on the first winding side increases the speed to a predetermined speed within a few seconds and continues winding the yarn at a constant speed. On the other hand, when the speed of the bobbin holder 1 on the first winding side is increased, the bobbin holder 2 on the empty bobbin side is driven prior to this and has reached the (normal) winding speed.

Further, after the speed of the first winding side bobbin holder 1 is increased, the fixation of the turret 3 is released and rotation starts. Due to this rotation, the package P is separated from the contact roller 7 as shown in FIG.
The positions of the two bobbin holders 1 and 2 change, and now the empty bobbin B rotates in contact with the contact roller 7, and the yarn is switched. In this case, the speed of the contact roller 7 decreases rapidly, but in the present invention, by increasing the speed of the bobbin holder 1 (package P) on the first winding side, the speed of the contact roller 7 rotating in contact with this is increased. let

The rate of speed increase of the contact roller 7 is preset or programmed to compensate for the speed decrease due to the free rotation state of the contact roller 7 during rotation of the turret, and therefore the turret 3 rotates approximately half a rotation. When the contact roller 7 contacts the empty bobbin B on the bobbin holder 2, which is being actively driven to the normal winding speed, the circumferential speeds are almost the same. Therefore, at the time when the yarn is switched at the same time or immediately after this, both the contact roller and the bobbin holder 2 have reached almost the normal (normal) winding speed, and the winding tension is within an appropriate range to ensure a stable and reliable yarn. A switch is made. Furthermore, since the innermost layer of yarn to be wound at this time is also at a normal winding tension level, the quality of the yarn does not change and the yarn is of normal quality.

In this way, in the present invention, the speed of the bobbin holder 1 on the first winding side during contact rotation is adjusted in advance so that when the turret 3 rotates and the contact roller 7 contacts the empty bobbin B, the speed is the same as the winding speed. The speed of the contact roller 7 is increased by increasing the speed before switching. Here, the rate of speed increase of the contact roller 7 (therefore, the bobbin holder on the first winding side) changes depending on the winding speed, package system, rotation speed of the turret, mechanical performance of the winding machine, etc., but in general, When the take-up speed is 5000 to 8000 TrL/1n, the speed increase rate is 1
．． A content of 3 to 3.8% is preferable because more stable and reliable yarn switching properties are ensured.

Note that the speed of the bobbin holder 2 on the empty bobbin side will drop to some extent during contact due to the inertia of the contact 0-rough during deceleration, so keep it slightly higher than the winding speed (about 0.2 to 0.8%). Good too.

Effects As explained above, according to the present invention, yarn switching can be performed reliably and stably with a simple and simple structure without making the device itself complicated, and at the same time, the yarn can be wound at the time of yarn switching. The yarn quality of the yarn at the innermost circumference of the package does not change, and a yarn with almost the same uniformity as when normally wound is obtained, which has an extremely large advantage.

Hereinafter, the effects of the present invention will be concretely explained using examples.

Example Fig. 4 shows a multifilament yarn of 75 denier/24 filaments of melt-spun polyethylene terephthalate using a spindle drive type automatic winder as shown in Fig. 1 at a winding speed of 5500 m/min. This figure shows a variation pattern of the winding tension (curve a+) and the speed of the contact roller (curve b+) at the time of yarn switching during winding in minutes.

Here, the contact roller is before the turret rotation (i+)
By increasing the speed of the bobbin holder on the filling side by 1-, the speed increases to 1.8 immediately after (or almost simultaneously) the turret rotates (t2).
The speed has increased by 5,600 m/min. Next, when the turret begins to rotate and the contact roller separates from the package, the speed of the contact roller decreases due to natural deceleration, and the turret rotates approximately half a turn until the contact roller comes into contact with the empty bobbin inserted in the bobbin holder. In this case, (t3) the speed becomes almost the same as the speed of the empty bobbin which has reached the winding speed due to the driving of the bobbin holder. In this way, since there is no change in the winding speed after contact, the decrease in yarn tension is small immediately after the yarn is caught in the slits of the empty bodon and the yarn is switched (t4). Since the yarn quickly recovers after that, it is less likely that the yarn will wrap around a roller or the like due to a decrease in tension, resulting in an unsuccessful yarn changeover. However, in this case as well, the thread tension is maintained at the normal tension level, so the quality of the thread does not change. In this case, the yarn switching success rate is about 98%.

Comparative Example Using a conventional spindle drive type automatic winder, the same spun yarn as in the example was set to 5665 m/min, which is 2.0% higher than the winding speed. The speed was increased and the yarn was switched. Figure 5 shows the winding tension (curve a2) and contact roller speed (curve b) at this time.
2) shows the fluctuation pattern. In this case, the turret starts rotating at t2 and the contact roller separates from the package, so the circumferential speed decreases, but at the time the contact roller contacts the empty bobbin (immediately at (3)), the contact roller moves 2.0 times faster than the winding speed. %, the speed is rapidly increased by the empty bobbin, and reaches the maximum value at t5, and reaches normal winding tension at t6.For this reason, the winding yarn in the innermost layer is subjected to an abnormally high tension, and the yarn quality is different. Become something.

In this case, the thread switching success rate is as high as 98 to 100% because the thread tension is greatly affected at the time of switching. Next, under the same conditions, when the run-up speed of the empty bobbin is increased to 5535 m/min, which is 0.6% higher than the winding speed, curve a3 (winding tension) 9 curve b3 (contact roller speed). Here, when the empty bobbin and the contact roller come into contact, the empty bobbin is braked by the contact roller and decelerates, so that both winding speeds are lower than the winding speed, so the winding tension decreases significantly when the yarn is switched. Also, the time required to return to normal winding tension is long (h),
The yarn switching success rate is extremely poor at 60 to 70%, making it impractical.

On the other hand, since the winding tension of the yarn in the innermost layer of the package does not exceed the normal value, the yarn quality is relatively unaffected.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an i-position suitable for carrying out the present invention;
3 is an explanatory diagram of the operation of the device shown in FIG. 1, FIG. 4 is a diagram showing a variation pattern of winding tension and contact roller speed for detailed explanation of the present invention, and FIG. 5 is a comparative example. FIG. 4 is a diagram showing a variation pattern similar to FIG. 4 for explanation. 1.2... Bobbin holder, 3... Turret, 7
...Contact roller, B...Bobbin, P...
package

Claims (1)

[Claims] When switching yarns in a spindle drive automatic winding machine in which a plurality of bobbin holders are supported by a rotatable turret motor and the bobbin holders are rotated by a drive motor, the speed of the bobbin holder on the fully wound side is increased. After
A yarn switching method in a spindle drive type automatic winding machine characterized by starting rotation of a turret.