JPS6216991A - Thread switching in spindle drive winding machine - Google Patents

Abstract

PURPOSE:To achieve stabilized, secure bobbin change after a thread is switched from a finished package to an empty bobbin by forming punch winding on the empty bobbin and thereby making a contact roller contact the empty bobbin. CONSTITUTION:By the turn of a turret, speed of a spindle 1 on the finished winding side is increased, a plunger 16 is raised by the action of an air cylinder 15, and a punch guide 12 is moved toward the tip direction along a roller 7. Then, a traverse thread Y, by the action of a thread removal guide 11, is removed from a traverse guide 9 and enters a guide 12 to form a punch winding around a package P. By the further turn of the turret, the thread Y is made to engage with a slit groove of an empty bobbin B' and is cut to form a punch winding. Then a plunger 16 is lowered by the action of the air cylinder 15, the roller 7 under a reduced speed condition contacts via the punch winding the bobbin B' and the guide 12 returns to original position to perform big-tail winding. Thus, bobbin change can be performed without any damage to a paper tube.

Description

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

[Prior art] In recent years, turret-type automatic winding machines that automatically switch the yarn wound onto a bobbin have been widely adopted in the melt-spinning and winding process of synthetic fibers from the viewpoint of automation, labor saving, and speeding up. It's starting to look like this. This type of winding machine was developed by the Special Publication Corporation in 1986-25.
As shown in Japanese Patent Publication No. 466 and Japanese Patent Publication No. 57-49462, various improvements have been made and have been put into practical use.
In cases where high-speed winding exceeding 1/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 a winding machine, since the turret rotates when switching the yarn (bobbin), the first winding bobbin, which frictionally drives the contact roller, separates from the contact roller. For this reason, a circuit is often installed that temporarily interrupts circumferential speed control by the contact roller, for example around the rotation of the turret, until it comes into contact with the next empty bobbin.

When switching the yarn by rotating the turret to move the positions of the first bobbin and empty bobbin in this way, when the first bobbin moves away from the contact roller, its speed is increased and the winding tension is increased. At the same time, the empty bobbin that has run up to a predetermined speed comes into contact with the contact roller instead, and after the yarn is switched, 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 its winding speed is significantly lower than the normal winding speed during this time. In this state, if the contact roller comes into contact with the empty bobbin that has run up to the normal winding speed, the speed of the empty bobbin (side spindle) will suddenly drop, making it impossible to perform stable yarn switching. .

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

However, in this case, as mentioned above, the contact roller is in a state where the winding speed is significantly lower than the normal winding speed, so when it comes into contact with the empty bobbin whose winding speed has been increased by some percentage, the surface layer of the paper tube of the empty bobbin will change due to the peripheral speed difference. It often happens that the yarn is stripped and bursts, and stable and reliable yarn switching cannot be expected, and there are also safety problems.

In order to solve this problem, a method has been used to ensure switching performance by using a high-speed paper tube with increased strength. However, as winding speeds have increased in recent years, the higher the winding speed, the greater the speed reduction of the contact roller when switching the bobbin, which requires a further increase in the strength of the paper core, and as a result, the cost of the paper core has increased significantly. The problem was that it was expensive.

[Object of the Invention] The present invention has been made in view of the current situation, and provides a spindle drive type turret winder that can perform stable and reliable bobbin switching without bursting the paper tube without using a high-speed paper tube with increased strength. The purpose of this invention is to provide a method for switching threads in a taker.

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

A spindle drive type winding system in which a plurality of spindles are supported by a rotatable turret, the spindles are rotated by a drive motor, and have a contact roller that rotates in contact with a bobbin inserted in the spindles to control the drive of the spindles. In the yarn switching method of the machine, after the yarn is switched from a complete package to an empty bobbin, a bunch winding is formed on the empty bobbin, and then a contact roller is brought into contact with the empty bobbin. This is a yarn switching method for a type winder.

[Example] The present invention will be explained below based on the drawings. FIG. 1 is a schematic perspective view of a spindle drive automatic winder suitable for carrying out the present invention, and FIG. 2 is an explanatory view of its operation.

In the figure, 1 and 2 are spindles (or bobbin holders)
Then, mW is applied to the bobbin B (in this example, a 4-piece type). The spindle 1.2 is supported horizontally by a turret (or turret arm) 3, and a spindle (not shown) that holds the spindle 1.2 is driven and rotated by a motor 4, so that thread switching can be performed. .

The spindles 1 and 2 are supported at an interval of 180 DEG C., and their rear ends are connected to motors 5 and 6 so that the individual spindles can be rotated by driving the motors 5 and 6.

Spindle 1 (2) is located above spindle 1 (2).
A contact crawler 7 is provided which is in contact with 5 and is frictionally driven. The contact roller 7 is in contact with the spindle (bobbin) during yarn winding to maintain a predetermined contact pressure or to control the rotation speed of the spindle 1 (2), and is surrounded by a cover 8 as shown in the figure. There is. Further, a traverse box 10 having a traverse guide 9 for traversing the yarn is disposed substantially parallel to the position facing the contact roller 7. The traverse box 10 is provided with a plate-shaped yarn removal guide 11 located above the traverse guide 9 for pushing out the yarn gripped by the traverse guide 9 and traversed toward the contact roller 7 and removing the yarn from the traverse guide 9. The thread is removed by operating a fluid pressure cylinder (not shown) and rotating the thread removal guide 11.

On the side of the cover 8 facing the thread removal guide 11, a linear bunch guide 12 corresponding to the thread removal guide 11 is disposed so as to be movable in the axial direction of the contact roller 7. This bunch guide 12 is provided with a V-shaped guide groove corresponding to each bobbin B, into which the thread removed from the traverse guide 9 is introduced when the thread removal guide 11 is operated. After forming a bunch winding on the pre-wound package P, a bunch winding is formed on the empty bobbin B' where the yarn is engaged with the slit groove of the empty bobbin B', and then it moves in the axial direction of the contact roller 7 and transfers. It forms an arch and returns to its original position.

The contact roller 7 (cover 8) and the traverse box 10 are connected at their rear ends to a slide block 14 supported vertically movably along two upright shafts 13.
A predetermined contact pressure is applied to the package depending on the winding process. In addition, an air cylinder 15 is attached to the machine frame (machine base) on the side of the turret 3 to temporarily stop the descent of the slide block 14 when the yarn is switched. Temporarily stopping the descent of the fixed length protruding slide block 14,
When the bunch guide 12 returns to its original position, the plunger 16 also retracts and returns to its original position.

Note that the position where the slide block 14 is temporarily stopped is the second position.
As shown in the figure, the gap between the contact roller 7 and the empty bobbin B' is set to be 1 mtn when the straight line connecting the centers of the first package P and the empty bobbin B' is in the vertical direction.

Next, an embodiment of the present invention will be described in more detail with reference to FIG.

Figure 3 shows the process of winding a melt-spun polyethylene terephthalate multifilament yarn of 1,000 denier/250 filament at a winding speed of 500,077 L/min using the spindle drive automatic winder shown in Figures 1 and 2. This figure shows the fluctuation pattern of the winding tension when the yarn is switched.

In the figure, the turret 3 starts rotating at time t1, and almost at the same time, the speed of the spindle 1 on the first winding side increases by 1.6%, and the air cylinder 15 operates and its plunger 16 rises. Further, the bunch guide 12 also moves along the contact roller 7 toward its tip. The winding tension increases as the circumferential speed of the first package P is greatly softened, and eventually settles down to a constant tension.

Thereafter, when the thread removal guide 11 operates at time t2, the traversing thread Y is released from the traverse guide 9, enters the guide groove of the bunch guide 12, is fixed in its position, and is bunch-wound around the outer periphery of the package P in the turret. form.

As the turret 3 further rotates, the yarn Y connected to the package P comes into contact with the outer peripheral surface of the empty bobbin B' whose speed has been increased in advance, and at time t4, the yarn Y connected to the package P comes into contact with the outer circumferential surface of the empty bobbin B', and at time t4, a slit for catching the yarn formed in the empty bobbin B' The spindle 1 with the empty bobbin inserted is moved axially outward by means similar to the mechanism described in Japanese Patent Publication No. 57-25466. ing). As a result of this capture, the yarn Y is cut between the package and the empty bobbin and is switched to the empty bobbin side, forming a bunch winding at a position outside the normal traverse range on the tip side of the bobbin B'. At this time, the slide block 14 is supported by the plunger 16 and its descent is interrupted, so the contact roller 7 is not in contact with the bobbin B'. Next, at time t5, the plunger 16 of the air cylinder 15 descends, and almost simultaneously the bunch guide 12 returns to its original position with its guide groove within the yarn traverse region, during which time a pigtail (transfer chill) winding is formed.

In this case, the slide block 14 is lowered by the downward movement of the plunger 16, and the contact roller 7 in the decelerated state comes into contact with the bobbin B', but this contact is first indirectly carried out through the bunch winding on the bobbin B' that was formed first. Since this is done in a consistent manner, the sudden impulse at the time of contact is greatly alleviated, and there is no possibility of damage to the bobbin as in the conventional case. After this, at time t6, the rotation of the turret 3 is completed and at the same time the thread removal guide 11
returns to its original position, and as a result, the yarn is captured by the traverse guide 9 and wound while being traversed.

In this way, the contact roller and the bobbin, which have a circumferential speed difference (usually around 40 to 80 m/min), do not come into direct contact with each other but rather through the bunch winding section, so there is no need to use a high-speed paper tube with increased strength. Therefore, the surface layer of the paper tube does not peel off or burst, and bobbin switching can be performed stably and reliably.

FIG. 4 shows a conventional spindle drive type automatic winder (for convenience, the first to second
This is a winding tension fluctuation pattern when the bobbin is replaced (explained with the same reference numerals using the figure).

In this case, as shown in FIG. 3, the spindle 1 on the complete winding side increases by 1.6% at the same time as the turret starts at time t1. The bunch guide 12 also operates. Thread removal guide 1 at time t2
1 is activated, and at time t4, the yarn is switched from the fully wound package P to the empty bobbin B', but in the conventional method, cylinder 1
Since the lowering of the slide button 14 by 5 is not temporarily interrupted, the contact roller 7 comes into direct contact with the empty bobbin B' at time t3 between time 2 and t4. Thereafter, at time t5, the bunch guide 12 returns to form a pigtail, and at time t6, at the same time as the turret is completed, the thread removal guide 11 returns, and the thread Y is wound onto the bobbin B' while being traversed. This is the case when a high-speed paper tube with increased strength is used, but when a normal paper tube is used, a burst occurs when the bobbin (paper tube) comes into contact with the contact roller 7 at time t3, and the switching occurs normally. This often happens.

[Effects of the Invention] As explained above, according to the present invention, even without using a specially strengthened high-speed paper tube, the paper tube will not be damaged and the bobbin can be switched stably and reliably. This is extremely effective in terms of safety as well as suppressing the increase in running costs due to increased winding speed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an apparatus suitable for carrying out the invention;
The figure is an explanatory diagram of the operation of the device shown in Figure 1, and Figure 3 is a diagram showing the variation pattern of the winding tension for detailed explanation of the present invention.
FIG. 4 is a diagram showing a variation pattern similar to that in FIG. 3 for explaining a comparative example. 1.2...Bobbin holder 3...Turret 7...
・Contact row 511... Thread removal guide 12...
Bunch guide 14...Slide block 15.
... Air cylinder 16 ... Plunge 1 - Patent applicant Teijin Ltd. Company employee 1 Zuko 2 Zuko 3 Zuko 4rfJ

Claims (1)

[Claims] A spindle drive type winding machine in which a plurality of spindles are supported by a rotatable turret, the spindles are rotated by a drive motor, and have a contact roller that rotates in contact with a bobbin inserted in the spindle to control the drive of the spindles. In the yarn switching method, after the yarn is switched from a complete package to an empty bobbin, bunch winding is formed on the empty bobbin, and then a contact roller is brought into contact with the empty bobbin. Yarn switching method for winding machine.