JPH04308163A - Tail thread forming mechanism for thread winding device - Google Patents

Abstract

PURPOSE:To provide a new mechanism capable of surely forming a tail thread with a preset length on a thread package for forming the tail thread when winding is started in the winding method of a thread on the thread package rotated by a rotating drum having guide grooves on the surface in contact with the thread while traversing it. CONSTITUTION:A drum 1 having two pairs of traverse guide grooves 2 crossing each other to traverse a thread on the surface is rotated forward to form a thread package on a bobbin 8 while it is rotated in contact with the drum 1 in a winder, and a spiral auxiliary guide groove 3 having an open end at the end section of the drum l is provided at a narrow pitch on the surface of the end section region of the drum 1 continuously with the traverse guide groove 2a to traverse the thread toward one end section region when the drum 1 is reversely rotated in a mechanism for forming a tail thread P in one end section region of the bobbin 8.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to a winder for rewinding the cup of a ring spinning machine or a yarn winding mechanism for an open-end spinning machine, in which yarn is traversed by a rotating drum having a guide groove on its surface. The present invention relates to a thread winding device that winds a thread onto a thread package that rotates in contact with a bobbin, and particularly relates to a novel mechanism for forming a tail thread on a bobbin at the beginning of winding.

0002

[Prior Art] When a yarn package formed by a winder or the like is used in the next process, such as a knitting process,
It is necessary to connect the rear end of the preceding yarn package to the leading end of the following yarn package in advance so that when the former is consumed, the latter yarn can be continuously paid out without stopping the machine. . Therefore, the yarn packages used in such processes include several turns of yarn (tail yarn) at a predetermined location on the cone bobbin (usually at the large diameter end of the bobbin outside the yarn traversing area) at the beginning of the winding. It is necessary to wind the end thread (referred to as .) so that it can be easily taken out and connected to the wound end of the following thread package in the completed thread package.

This tail thread forming operation has conventionally been carried out as follows. When winding of the preceding yarn package on the yarn package winder is completed, the rotation of the drum is stopped,
The completed yarn package is removed from the holder and rolled backwards. The drum is then reversed at low speed. As shown in FIGS. 4 and 5, an auxiliary guide groove 23 is provided on the large-diameter end side of the drum 21, which is continuous with the regular traverse guide groove 22 and extends beyond the traverse range when reversing the rotation. Because
Regardless of its initial position, the yarn connected to the full yarn package moves to the traverse guide groove 22 as the drum reverses.
It gradually enters this auxiliary guide groove 23 and comes off from the end of the drum 21. In this state, the thread connected to the full package is cut by a gripping/cutting means (not shown), and its tip is held by the means. At the same time, a new bobbin is supplied to the holder, and the thread end is clamped to the end of the bobbin by the adapter.

When the drum 21 starts to rotate normally, the yarn tries to engage with the traverse guide groove 22 again and perform a normal traverse, but before this happens, the hook 24, which will be described later in FIG. is applied for a predetermined period of time to prevent the thread from traversing, and the thread is wound around a predetermined location on the large diameter end of the new bobbin to form a tail thread. Immediately after the tail yarn is formed, the restriction of the yarn by the hook is released, the yarn is wound onto the bobbin while repeating the normal traverse movement, and the formation of a new yarn package is started.

FIG. 6 schematically shows a tail thread forming mechanism including this hook 24. One end of the hook 24 is fixed to the tip of a thread-forming rod 25 that is pivotally supported on the frame by a pin 26, and the rod 25 is fixed to the tip of the pin 26 by an actuating rod 27.
rotates around the center, restrains the thread Y, and places the tail thread P on the bobbin 28.
The thread release position is movable between the illustrated position where the thread is formed and the thread release position moved in the direction of arrow A from this position.

[0006]

In this conventional method, the tail thread is formed by the thread wound around the bobbin while the traverse movement of the thread is restrained by the hook 24. However, since the above-mentioned tail thread forming mechanism has considerable inertia, its operation inevitably requires a considerable amount of time, and it is impossible to stably maintain the thread binding time to a very short constant value. It is possible. Especially in today's high-speed winders, 10
A winding speed of 00m or more is normal, and the locking time is 0.
．． If there is a difference of 1 second, there will be a difference in thread length of nearly 2 m in the tail thread.

[0007] Originally, the appropriate length of this tail thread is about 30 cm to 60 cm; if it is shorter than this, it will be impossible to connect with the succeeding thread package, and if it is too long, it will be used in the next process. When unwinding the thread, the thread gets caught in the rod-wound part of the tail thread, or becomes tangled, causing accidents such as breakage. For this reason, at the production site of yarn packages,
According to the user's request, we perform a 100% inspection after doffing the yarn package, and if the yarn package is short, we manually form the yarn package and then rewind it to form a yarn package. The excess part is manually untied and adjusted to an appropriate length before shipping. Naturally, such a correction operation increases the manufacturing cost of the yarn package, and furthermore, rewinding the yarn again has the disadvantage that the quality of the yarn itself deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art and to provide a mechanism with a simple structure that can reliably form a tail thread of a predetermined length in a thread package.

[0009]

[Means for Solving the Problem] The purpose of this is to rotate a drum in the normal direction, which has two sets of traversing guide grooves that intersect with each other for traversing the thread, on its surface, and to rotate the drum while contacting and rotating the drum. In the yarn winding device that forms the yarn package,
A mechanism for forming a tail thread at a predetermined location on one end region of a bobbin at the beginning of winding of a thread package, and for traversing the thread toward the one end region when the drum is reversed. Continuing with the traversing guide groove, a single spiral auxiliary guide groove having an open end at the end of the drum is provided at a narrow pitch on the surface of the end region of the drum. This is achieved by the tail thread forming mechanism.

0010

[Operation] When the preceding yarn package reaches full capacity, the drum stops winding as usual and the yarn package is removed from the holder. Then, the yarn enters a reverse phase, engages with the traversing guide groove, and moves to the end of the drum on the side where the auxiliary guide groove is provided. As the reversal continues, the thread enters the helical auxiliary guide groove and finally comes off the drum.

At this point, the drum is stopped, the thread is cut and held as described above, and is held at the end of a new empty bobbin by an adapter or the like. When the drum starts rotating normally, the yarn engages with the auxiliary guide groove and is guided by it to move toward the regular traverse guide groove. During this time, the thread is wound around the end region of the bobbin at a narrow pitch only in the area where the auxiliary guide groove is provided, thereby forming a tail thread.

[0012] When the tail thread formation is completed, the thread is automatically introduced into the regular traversing guide groove, and is wound onto the bobbin while repeating left and right traverses to form a thread package. As described above, according to the present invention, it is guaranteed that the tail thread always has a constant length defined by the pitch of the auxiliary guide groove and the number of turns.

Below, based on the preferred embodiment shown in the drawings,
The present invention will be explained in more detail.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a front view of an embodiment in which the present invention is applied to a cone-shaped drum. This drum 1 includes two sets of normal traversing guide grooves 2a and 2b which intersect with each other, and a spiral auxiliary guide groove 3 is provided in the large diameter end region. FIG. 2 shows a developed view of the surface of this drum 1. When the drum 1 rotates normally, that is, when winding the yarn package, the yarn starts from point M on the small diameter end side and moves diagonally inside the guide groove 2a as shown by the dotted line along the arrow direction in FIG. It is traversed pointing to the lower right, reaches point N on the large-diameter end side, turns to the guide groove 2b, and follows the path pointing to the lower left as shown by the chain line to point M again, and repeats this process.

The auxiliary guide groove 3 is similar to the traverse guide groove 2.
It is branched from a and is provided continuously. As mentioned above, when the drum 1 is reversed to form the tail yarn, the yarn is traversed in the guide groove 2a along the path in the opposite direction. Without shifting to the guide groove 2b and changing the traverse direction,
It is introduced into the auxiliary guide groove 3 as it is. This is because the auxiliary guide groove 3 is continuously provided as an extension of the traverse guide groove 2a in accordance with the inclination direction of the traverse guide groove 2a.

As shown in FIG. 1, the auxiliary guide grooves 3 are provided in a narrow range of the large-diameter end area of the drum 1 at a much narrower pitch than the traverse guide grooves 2a and 2b. ing. In the example shown, in the end region of a drum of approximately 100 mm diameter, with a pitch of approximately 5 mm, the width of the drum surface is 1
It is provided as a groove with a width of 2 mm and a number of turns of 1.5 in a range of 0 mm. Preferred ranges of these values are approximately 1 to 4 turns, 3 to 6 mm pitch, and 1 to 3 mm groove width.

The conventional drum 21 is also provided with an auxiliary guide groove 23 for the purpose of removing the thread from the end of the drum, but this groove does not have any function of forming a tail thread. As shown in FIG. 5, this auxiliary guide groove 23 is
1 at a coarse pitch approximately the same as the traverse guide groove 22.
It is only formed as a very short and thick groove of about one-tenth of the circumference. Therefore, when the drum starts rotating normally and winding starts, unless there is some kind of movement preventing means, the yarn instantly passes through the auxiliary guide groove 23 and is introduced into the regular traversing guide groove 22. There is no time for the threads to form. Therefore, as described above, a hook or the like is used to forcibly restrict the thread to the end region of the bobbin for a certain period of time to form a tail thread there.

In contrast, in the present invention, the yarn guiding function of the auxiliary guide groove 3 is actively utilized to successfully form the tail yarn without adding any special additional means. It is. A procedure for forming tail threads using the drum of the present invention configured as described above will be explained.

When a yarn package of a predetermined size is completed on the drum 1, the drum 1 stops, and the full package is removed from the holder by a doffer (not shown) and rolled backward. This situation is shown in Figure 3a. Next, the drum 1 is reversed, and the yarn Y is gradually moved to the large diameter end of the drum 1.
It is introduced into the auxiliary guide groove 3 and removed from the end of the drum. (FIG. 3b) Next, the thread connected to the full package is cut, and the thread end is held by the holding means and comes into contact with the drum surface diagonally. At the same time, the empty bobbin 8 is supplied to the holder, and the thread end is attached to the adapter 9. is held by the large diameter end of the bobbin 8. The operations up to this point are substantially the same as those in the prior art described above with reference to FIGS.

[0020] In the present invention, the drum 1 starts normal rotation as it is, without using a hook or the like to maintain the yarn in the winding position as in the prior art. Then, Figure 3c
As shown in , the thread in contact with the surface of the drum engages with the auxiliary guide groove 3 and moves toward the traversing guide groove 2 in the reverse order of the thread removal operation. As mentioned above, the auxiliary guide grooves 3 are formed for a predetermined length at narrow pitches, so when the thread is wound along the auxiliary guide grooves 3, the yarn is placed on the bobbin to correspond to the auxiliary guide grooves 3. A tail thread P having a length of width is formed.

[0021] Then, when this tail thread formation is completed,
The yarn is introduced into the traverse guide groove 2 and wound onto a bobbin while being subjected to a regular traverse action to form a yarn package. According to the present invention, only the auxiliary groove provided in the drum ensures the formation of a tail thread of a constant length, so that a movable member such as a hook can be rapidly moved between a standby position and an operating position. Compared to the traditional method of forming tail threads,
Results with extremely little variation in yarn length can be obtained.

The length of the tail yarn formed in the manner described above using the drum of the present invention is shown in FIG. 1, and the length of the tail yarn formed in the conventional manner using a conventional drum as shown in FIG. Examples of actual measurement results are shown in Tables 1 and 2, respectively.

[0023]

[Table 1]

[0024]

[Table 2] As is clear from the results, the tail yarn according to the present invention shown in Table 1 had very little variation in length, and all of the lengths were within the preferable range, whereas the conventional tail yarn shown in Table 2 Many of the tail strings produced by this method were extremely long as a whole, and required manual work to unravel the tail strings. Further, the variation ranged widely from 400 mm to 10 mm, and in particular, 3 of the 100 yarn packages measured had a tail yarn length of 20 cm or less and required rewinding. Although the above explanation was about an example in which the present invention was applied to a cone-shaped drum, the present invention is not limited to this, and the same applies to a cylindrical drum for forming cylindrical cheese. Applicable to

[0025]

[Effects of the Invention] According to the present invention, when forming the tail thread,
Since there is no need to use a movable member with mass such as a hook to maintain the thread at the tail thread forming position for a predetermined period of time, the overall mechanism is simplified and the rapid acceleration/deceleration of these members is avoided. This eliminates the need for difficult time control caused by This greatly reduces the variation in the length of the tail threads.

In the present invention, since the tail thread is formed only by the auxiliary guide groove, the length of the tail thread can be arbitrarily set by changing the pitch of the auxiliary guide groove and the number of windings. The most suitable tail yarn can be selected and provided for each yarn package.

[Brief explanation of drawings]

FIG. 1 is a front view of one embodiment of the drum of the present invention.

FIG. 2 is a developed view of the surface of the drum in FIG. 1;

FIGS. 3(a), (b), and (c) are explanatory diagrams showing the procedure for forming a tail thread according to the present invention.

FIG. 4 is a front view of a conventional drum corresponding to the drum of FIG. 1;

FIG. 5 is a developed view of the surface of the conventional drum of FIG. 4;

FIG. 6 is a perspective view of a winder showing a schematic configuration of a conventional tail thread forming mechanism.

[Explanation of symbols]

1...Drum 2...Guide groove for twill swing 3…Auxiliary guide groove 8...Bobbin 9...Adapter P... tail thread Y...thread

Claims (3)

[Claims] Claim 1: A drum (1) having two sets of mutually intersecting traversing guide grooves (2) for traversing the yarn on its surface is rotated in the normal direction, and while the drum (1) is in contact with and rotates, a bobbin (8) is attached to the drum (1). A mechanism for forming a tail thread (P) at a predetermined location in one end region of a bobbin (8) at the beginning of winding of a thread package in a thread winding device for forming a thread package on a drum. (1) The traversing guide groove (2a
), a spiral auxiliary guide groove (3) having an open end at the end of the drum is provided on the surface of the end region of the drum (1) at a narrow pitch. The tail thread formation mechanism. 2. The drum (1) is a cone-shaped drum for winding up a cone-shaped yarn package, and the auxiliary guide groove (3) is provided in a large diameter end region of the drum (1). Item 1. The tail thread formation mechanism according to item 1. [Claim 3] The number of turns of the auxiliary guide groove (3) is 1.
The tail thread forming mechanism according to claim 1 or 2, which is within the range of .about.4.