JPH0388676A - Traverse drum - Google Patents

Abstract

PURPOSE:To prevent generation of tension breakage by constituting a turn back part of grooves with a different tilt from each other, in the turn back part of an end part of the traverse groove. CONSTITUTION:A tilt angle theta1 of grooves 11, 12 in an intermediate part, angle theta2 of traverse grooves 13, 15 and an angle theta3 of traverse grooves 14, 16 are set so that a relation where theta2<theta1<theta3 is established. Now when a drum 10 is rotated in the direction of an arrow head 17, a thread is fed leftward by arrow heads A1 to A4 along the groove, inversely fed rightward in the direction of arrow heads B1 to B4 and traversed. For instance, in a thread, guided in the groove 13 in the direction of the arrow head B4, a traverse speed V4, when the thread is moved in the right direction, is decreased relatively smaller than a traverse speed V23, when the thread is moved in the groove 11 in the direction of the arrow head B3, and the thread is moved at a speed slower than the existing speed from a crossing part P1 to reach a turn back end part T1 and quickly moved by the groove 14 after inversion. Accordingly, because of no rapid change between the groove 13 and the shallow groove 14 in the inversion part with no necessity for making the groove 13 deep. fluctuation of tension is suppressed small with end breakage avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a traversing drum applied to a thread winding machine such as an automatic wine gourd.

[Conventional technology]

For example, automatic winders for rewinding spinning bobbins to form corn packages or cheese packages are known.

In such an automatic wine goo, the package (3) is driven in surface contact by a drum (2) formed with a traverse groove (1) for traversing the yarn (Y), which is called a traverse drum as shown in Fig. 6. The yarn is wound onto the package (3) while traversing and traversing.

That is, in FIG. 4, which shows the surface of the drum (2) developed, the 2-wind drum (2) has a traverse groove (1
) has intersection parts (Pl> to (P3)) at three locations, and shallow grooves and deep grooves are formed.

That is, when the thread moves from the right end (2R) to the left end (2L) of the drum, the groove (At) - (A2) → (A3) → (A
4>, and from the left end (2L) to the right end (2R> there is a groove (
Moves from B1) to (B2) to (B3) to (B4).

When using this drum, the drum (2) rotates twice as the thread moves from one end of the drum to the other. Such a drum is called a two-wind drum.

Therefore, the traversing yarn (Y) is wound at a constant traverse angle (θ1>), and if the rotational speed of the drum is constant, the traverse speed of the yarn is also constant.

On the other hand, as shown in Fig. 6, the thread (Y) to be wound is mechanically
Strictly speaking, the chain point (○) moves slightly from side to side and back and forth, but it is essentially a traverse specified by the traverse groove (1) with the above point (○) as the fulcrum. It runs and is wound up into a package while traversing left and right between the traverse widths (i) specified by the grooves (1>).

[Problem to be solved by the invention]

In the traversing drum, when the yarn is traversed, especially at the traverse end, the groove (1a) is shallowly formed so that the yarn can quickly wrap around the package surface and turn back at the traverse turn-back position on the puff cage surface. There is a need. On the other hand, the groove <1b> for moving the thread near the center toward the traverse end needs to be formed deeply. In other words, if the groove (1b) is shallow, the yarn will jump out of the groove and cannot be guided.
) is deep, and the groove <1a> at the end is shallow.

Therefore, when the yarn moves toward the traverse end, the tension increases rapidly due to the groove shape shown in Figure 5, and there is a high possibility that the tension will break. In addition, in the case of a cone package as shown in Fig. 6, on the small diameter side of the package,
Sudden tension fluctuations cause a bulge called a bulge on the end face of the package, which is a major cause of tension fluctuations during unpacking.

The present invention aims to solve the above problems.

[Means to solve the problem]

In the traversing drum according to the present invention, the folded portion of the end portion of the traverse groove is formed by grooves having different slopes.

〔Example〕

In FIG. 1, one embodiment of the #1 swinging drum according to the present invention is shown. In this embodiment, a two-wind drum will be described, but it is of course possible to apply the gist of the present invention to drums with other wind numbers.

No. 11 developed in the same way as Fig. 4! The drum (10) of I has two wind traverse grooves (11) and (12) usually formed in the middle part of the drum, and two wind grooves (11) and (12) at both ends of the traverse.
Traverse grooves with inclination angles different from > (13) (14)
(15) and (16) are formed.

That is, the inclination angle of the grooves (11) and (12) in the middle part is (θ1)
and a traverse groove (13
) (15) is (θ2), and the angle of the traverse grooves (14) and (16) from the folded end toward the center is (θ3), then θ2〈θl〉θ3・・・・・・・・・・・・...The angle is set so that the relationship (A) holds true. Note that the above angle is defined as the angle formed between the intersection point and a straight line perpendicular to the axis of the drum. The above angle (θ2〉(θ3)
The optimum value is set depending on the yarn type and the angle (θ1) determined by the standard number of winds. The above angle (θ
The value of the angle (θ2) of 2〉(θ3) is regulated to some extent by the yarn traverse speed, yarn tension, etc. If it is too large, the groove (14) (16) If the returning force is extremely large, the thread may come off the groove or the thread may be damaged at the intersection (
Inconveniences such as poor thread crossing of P1) (P3) occur.

Therefore, in the embodiment shown in Fig. 1, if grooves (11) and (12) are for 2 winds, grooves (13) < 15) are for 3 winds, and grooves (14) and (16) are for 1.5 winds. These grooves are formed at different angles of inclination. In other words, the folded end position (T 1) (T 2) is shifted from the normal drum folded end position (Fig. 4 (t)) by a distance (α) in the drum's circumferential direction to the zero rotation direction of the drum. This means that it is shifted in the opposite direction.

This amount of deviation (α) changes depending on how the angle (θ2) is set.

In the drum (lO>), when the drum (10) rotates in the direction of the arrow (17), the thread moves to the left along the groove according to the arrows (At) to (A4>), and then reverses and moves to the left according to the arrows (Bl) to ( B4) and is traversed to the right.At this time, for example, the thread guided through the groove (13) in the direction of the arrow (B4) has a traverse speed when moving through the groove (11) in the direction of the arrow (B3). The rightward traverse speed (V4) is relatively smaller than (V34), and the intersection (
Pi), it moves slower than before and reaches the turning end (Tl), and after the turning, it moves rapidly due to the groove (14>).

Therefore, as shown in Fig. 5, the yarn moving from the center of the drum to the end was guided by the deep grooves (1b), and suddenly became shallow grooves (Ia) at the reversal part (1). However, with the drum of the present invention, the yarn moves slowly toward the traverse end, so The groove (13) also does not need to be deep, and can be formed as a shallow groove (13) as shown in Fig. 3 without any problem.Therefore, there is no sudden change between the inverted part and the shallow groove (14), so the tension can be reduced. Fluctuations can be kept small and thread breakage can be avoided. Furthermore, when winding the cone package with the drum (2) in FIG. 1, it is possible to prevent tension breakage that tends to occur on the large diameter side, and to prevent bulges on the end face of the yarn layer that tend to occur on the small diameter side.

In Figure 3.5, (13) and (14) are at the bottom of the groove (
18> is the drum surface.

The traversing drum (20) shown in Fig. 2 is one in which the present invention is applied only to one end of the drum (20).
Showing a wind drum. That is, the left-hand traverse is performed along the directions of arrows (A1> to (A4)), the right-hand traverse is performed along the arrows (B1) to (B4), and the groove (
The inclination angle (θ2) of 21) is set smaller than the angle (θ1) of the 2-wind groove <22>, so that the right turn near end portion i! ! (T3) is shifted by (β) from the normal folded end (T4) on the circumference of the drum. Therefore, the inclination angle (θ3) of the groove <23> after folding is θ2
The relationship is 1<θ3.

In the drum described above, as in the drum shown in FIG. 1, the traverse speed of the yarn toward the outside decreases at the right end, and the ridge angle of the yarn also decreases, so that a sudden increase in tension can be avoided.

The traversing drums of the first and second embodiments are shown for the case where the number of yarn winds during rightward and leftward traverses is equal; In different cases, for example, even in a drum in which grooves are formed in the number of winds of 2W and 4 degrees when going to the right and the number of winds of 3W when going to the left, there is a groove at the traverse end that reduces the traverse speed as described above. It is possible to form

Furthermore, the same groove that reduces the traverse speed can also be used in a drum that has a switching groove in the middle of the right-hand traverse groove so that 3-wind right-hand movement and 2-wind right movement can be selectively performed. It is possible to form

〔Effect of the invention〕

As described above, in the present invention, the folded portions of the traverse grooves of the traversing drum are formed by grooves having different slopes, thereby creating grooves that can alleviate sudden fluctuations in tension at the end of the traverse of the yarn. This can effectively prevent thread breakage, bulges, etc.

[Brief explanation of drawings]

Fig. 1 is a developed view of a traversing drum showing an embodiment of the present invention, Fig. 2 is a developed view showing an embodiment of the same, and Fig. 3 is the depth of the grooves (13) and (14) in Fig. 1. Fig. 4 is a developed view showing the conventional drum, and Fig. jN5 is 's
FIG. 4 is a developed cross-sectional view showing the change in depth of the grooves (lb) (1a), and FIG. 6 is a front view showing the state in which the yarn is wound around the package by the vJ swing drum. (10) (20) Traverse drum (13) (14), (21) (23) -) Rubber groove (θ2) (θ3) Groove inclination angle

Claims (1)

[Scope of Claims] A traversing drum characterized in that a folded end portion of a traverse groove of the traverse drum is constituted by grooves having different slopes.