JPH02231365A - Traverser device for yarn - Google Patents

Abstract

PURPOSE:To even invert a yarn, while it is guided by a yarn guide, by providing a reciprocating spiral groove, having an R part in the both ends, in scroll cams opposedly arranged and a synchronously driving mechanism with the yarn guide having a yarn hook preventing tilt side and providing a yarn dislocating guide in both ends of an actual winding width. CONSTITUTION:A reciprocating spiral groove, having an R part in the both ends, is provided in scroll cams 16a, 16b opposed arranging yarn guides 14, 15, engaged with each reciprocating spiral groove, with a traverse yarn way in common, and a periodically driving mechanism, parallelly running in a forward path guide groove of the one scroll cam and in a return path turn groove of the other scroll cam, is provided. The yarn guides 14, 15 provide a yarn hook preventing tilt side in an antiguide direction and yarn dislocating guides 24, 25 in both sides of an actual winding width. By this constitution, the yarn guides 14, 15, not holding a yarn 5 in the R part, reduce friction in the large moderate turn groove winding the yarn not by its tension more uniformly on a bobbin by a fixed acute angle turn, and a high selvage can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a yarn traverse device, and more particularly to a traverse device that engages a yarn guide in a reciprocating helical groove and moves it back and forth. [Prior Art] Fig. 8 shows an example of a conventional yarn traverse device in which a yarn guide is engaged with this reciprocating helical groove and moved back and forth. A reciprocating helical groove (2) is machined on the surface of the cylindrical scroll cam (1). The thread guide (3) engages with this reciprocating helical groove (2) and reciprocates in section G. In order to obtain ideal reciprocating motion of the thread guide (3), it is desirable that the shape of the reciprocating helical groove (2) at the left-right reversal point be a corner bend as shown in the figure. However, if the thread guide (3) is bent at a corner, a large reversing force is applied to the thread guide (3), shortening its life. Therefore, the current situation is to make the reciprocating helical groove (2) have an R-curve at the left-right reversal point, as shown by the dashed line. However, due to this R bend, the threads at both ends of the package overlap more, causing selvage height and deteriorating the package shape. Therefore, as a means for making the horizontal reversal point of the reciprocating helical groove (2) into an R-curve and abruptly reversing the yarn, the method shown in Fig. 9 has been proposed (Japanese Unexamined Patent Publication No. 58-135068 and Japanese Unexamined Patent Publication No. 58-58 (Refer to Publication No.-224972). In Fig. 9, the thread guide (3) has a rectangular shape and engages with the reciprocating helical groove (2) and the guide rail (4) (4') to reciprocate from side to side. The left side (3a) of the yarn guide (3) serves as the left-hand welding portion of the yarn (5) and guides the yarn. Similarly, the right side (3b) of the thread guide (3) becomes the right-hand welding part of the thread (5) and guides the thread. The thread (5) strokes by being guided alternately by the left and right sides (3a) and (3b). By the way, when the thread guide (3) approaches the left-right reversal point, the thread (5) rides on the thread removal member (6).
The yarn (5) is designed to be released from the weaped portion on either the left or right sides (3a) or (3b). This is an application of the fact that when the thread (5) is released from the thread guide (3), the thread (5) suddenly reverses itself due to the tension of the thread (5). The operation of the thread guide (3) and thread removal member (6) is shown in Figure 10(a).
(b), (c), (d), and (e) will be explained in more detail. In FIG. 10(a), the thread (5) is guided by the left side (3a) and strokes to the left. Thread guide (3
In Fig. 10(b), just before the thread ( ) reaches the R bend, the thread (
5) rides on the thread removing member (6) and is released from the left side (3a). Then, the yarn trajectory K2 suddenly reverses at an angle θ depending on the tension of the yarn (5). In Fig. 10(C), the thread guide (3) is located at the leftmost end, and the thread (5) is located at the leftmost end.
) It is further to the right of the right side (3b) and is in a free state. In FIG. 10(d), the thread guide (3) has passed through the R bend and is following the thread (5). Figure 10(e)
Now, the thread guide (3) catches up with the thread (5) and the right side (
The thread (5) is attached to the thread 3a), resulting in a thread trajectory K due to the thread guide (3). In this way, the thread trajectory is the thread guide (3)
The yarn locus K, which is attached to the left side (3a), and the yarn (5)
The thread trajectory returns naturally under the tension of K. It consists of three sections: , and a yarn locus K that is connected to the right side (3b) of the yarn guide (3). In addition, (R) is a touch roller, (SpC is a bobbin holder, (B) is a bobbin, (
P) is a package.

[Problem to be solved by the invention]

In the yarn traversing method described in the prior art, after the yarn (5) is released from the yarn guide (3), it is reversed depending on the yarn tension. The thread guide (3) that has passed through the R bend catches up and guides the thread again. Therefore, as shown in Figure 10, the yarn trajectory depends on the yarn tension K! Although this thread has a section, this thread trajectory K. The problem is that it is not necessarily constant because it depends on the yarn tension, and moreover, it changes depending on the type of yarn and yarn tension (5), and it is practically difficult to obtain a homogeneous package with a constant yarn trajectory K8. There was a point. The present invention has been made in view of the above-mentioned problems of the conventional technology, and an object of the present invention is to provide a yarn traverse device in which the yarn guide can guide the yarn and also reverse the yarn at an acute angle. This is what we are trying to provide. [Means for Solving the Problems] In order to achieve the above object, the traverse device of the present invention is a yarn traverse device in which a yarn guide is engaged with a scroll cam having a reciprocating helical groove and moves back and forth. Two sets of scroll cams each provided with a reciprocating helical groove consisting of a forward guide groove shaped like an outward path and a return turn groove having rounded portions at both ends are arranged to face each other, and the thread guides 2&! I is arranged so that the thread path of the traverse is common, and a synchronized drive mechanism of the scroll cam is provided to make the outward guide groove of one scroll cam and the return turn groove of the other scroll cam run in parallel, and the thread guide is moved in the opposite direction. It has slanted sides to prevent the thread from getting caught, and thread removal guides are provided on both sides of the actual winding width. [Operation] A scroll cam having a forward guide groove of ■→■ and a return turn groove of ■→■ [as shown in FIG. 3 (a)], and a scroll having a return turn groove of ■→■ and an outward guide groove of ■→■ The opposing arrangement of the cams [shown in Figure 3(b)], the synchronized drive mechanism of these scroll cams, and the thread guides that share a traverse thread path are such that one thread guide can move the thread within the actual winding width. While traversing, the other thread guide turns without thread, and the thread is transferred from one thread guide to the other at the end of the actual winding width, and the thread guide turns and thread traverses twice! Jl
The thread guides alternately share roles and work to simultaneously realize an acute turn of the thread and a gentle turn of the thread guide.
The thread guide, which has an inclined side in the direction opposite to the guide to prevent thread hooking, functions to prevent the thread from coming off the thread guide at the intersection of the thread guides (point A in FIG. 4). Also,
The thread removal guide moves to pass the thread from thread guide to thread guide.

[Examples] Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the traverse device of the present invention, FIG. 2 is a top view of the traverse device, FIG. 3 is a developed view of each scroll cam, and FIG. 4 is a composite transfer developed view of the reciprocating helical groove of each scroll cam. FIG. 5 is a diagram showing the thread guide, and FIGS. 6 and 7 are operational diagrams of the thread guide.

In FIG. 1, a pair of scroll cams (16a) (1
6b) are rotatably supported within the cam drums (17a) and (17b), and are arranged facing each other with the thread (5) at the center. The yarn guides (14) and (15) are arranged vertically at a slight interval "N" so that they can share the traverse yarn path. Note that it is preferable that these scroll cams (16a) (16b) be configured as compactly as possible to minimize the distance between the thread guides (14) (15) and the touch roller (R) [i.e. ) (15) improves the responsiveness of the guide time delay, etc.] In Fig. 2, this pair of scroll cams (16a)
(16b) is driven by a common motor (30), and a pair of scroll cams (1
6a) The positional relationship of the reciprocating spiral grooves in (16b) is maintained. This synchronous drive mechanism may use a timing belt (32) or a chain or gears.

Next, the reciprocating helical grooves in each scroll cam (16a) (16b) will be explained based on FIGS. 3 and 4.

In FIG. 3(a), the scroll cam (16a) is expanded in the direction of the diameter πD, and the actual volume width "
The roughly linear first guide groove (10) [■→■] in "M" and the R part (Rl) with both ends gentle in "L" during traverse
and R. ) first turn groove (11) (■→■)
It has a first helical groove consisting of. Similarly, Figure 3 (
b) As shown in the figure, the scroll cam (16b) has a second turn groove (l2) [■→■] whose both ends are gently rounded parts within the traverse width "L" and an actual winding width "M". The scroll cams (16a) and (16b) are opposed to each other while maintaining this correspondence. 1
The guide groove (10) and the second turn groove (12) and the first turn groove (11) and the second guide groove (13) run in parallel. Note that this reciprocating helical groove is used for the package (P
) are provided in the axial direction.

In order to clarify the correspondence relationship between each scroll cam (16a) (16b), FIG.
The reciprocating helical grooves of the scroll cam (16b) and the scroll cam (16b) are superimposed, and the reciprocating helical grooves running in parallel are developed in a transfer manner.

In Fig. 4, the scroll cam (16a) ■→■→
The guide (14) that engages with the helical groove (3) and the thread guide (15) that engages the helical groove (■→■→■) of the scroll cam (16b) are shown traversing. And is the thread guide (14) the first guide from ■→■? li(10
) to traverse the thread, then the guide (l5)
The yarn is traversed through the second guide groove (13) (1) to realize an acute angle turn of the yarn. Therefore, at point D, the thread is transferred from the thread guide (14) to the thread guide (15). Similarly, at point B, from the thread guide (15) to the thread guide (
14) Pass the thread to. Then, while the yarn guide (l4) of the guide groove (10) is guiding the yarn, the turn groove (l4)
2) The thread guide (15) makes a large gentle R turn (R
l and R8).

Next, the structure and operation of the thread guides (14) and (15) will be explained. In FIG. 5(a), the thread guide has a chevron shape with a groove (19) in the center for storing the thread (5), and the left hypotenuse (20) is higher than the right hypotenuse. therefore,
When moving to the right, hold the thread (5), but when moving to the left, hold the thread (5).
5) is pushed up so that it can be jumped over.
The thread guide in FIG. 5(b) has a right-angled triangular shape, with the side (21) guiding the thread and the opposite side being the hypotenuse (22). Either thread guide may be used; in both cases, the thread is guided in the right direction, and in the left direction, the thread is not guided, but only jumps over the hypotenuse (20) or the hypotenuse (22). The operation of the thread guides when overtaking at points A and F in Fig. 4 will be explained based on Fig. 6 when such thread guides (14) and (15) are disposed facing each other. Thread guide (1
4) grips the thread (5) and traverses to the left, the thread guide (15) overtakes it. Figure 6 (
Figure 6 (a) shows the scene before overtaking, and Figure 6 (b) shows the scene just before.
Since the thread (5) is pushed into the groove (19) by the inclined side (20), it does not come out of the groove (19). Then, the thread (5) slips and jumps over the sloped side (20),
The overtaking shown in Figure 6(c) is completed. Next, the transfer of the thread between the thread guides (14) and (15) will be explained with reference to FIGS. 2 and 7. In FIG. 2, the thread removal guides (24) and (25) are provided on the upper surfaces of the cam drums (17a and 17b) to face each other on both sides of the actual winding width "M" (see FIG. 1). The thread removal guides (24) and (25) are triangular plates having inclined sides (26) and (27) that face inward during the actual winding.
The thread passing at point D shown in FIG. 4 using this thread removal guide (24) will be explained based on FIG. 7. Thread guide (14
) reaches point D, the other thread guide (15) also reaches point D. Then, as shown in Figure 7, the hypotenuse (26
), the thread (5) comes off the groove (19) and the thread guide (
l4) moves further to the left. Since the thread guide (15) is located directly below the thread guide (14) and is oriented to the right (7th
(The figure is shifted to the left for clarity), the thread guide (15) replaces the thread guide (14) and the thread (5)
, and traverse along the first guide groove (l3) from ■→■ shown in the fourth figure. Next, the operation of the traverse device having the above-mentioned configuration will be explained based on FIGS. 2 and 4.

In Fig. 4, the thread (5) is traversed by the thread guide (14) through the guide groove (10) from ■ to ■. Then, at point A, the thread guide (l4) is overtaken by the second thread guide (15), but around 1 in Fig. 5, the hypotenuse (20) (
22), there is no problem in the traverse of the thread (5) by the thread guide (14). Then, place the first thread guide (
14), the thread (5) is transferred from the first thread guide (14) to the second thread guide (l5) by the thread removal guide (24) shown in the second figure, and then passes through the second guide groove from ■→■. It is traversed by Through the above operations, the thread (5) becomes ■→■→
This means repeating sharp turns from ■→■.

On the other hand, the thread guides (14) and (15) turn at a gentle R portion while not gripping the thread, and the reversing force is small.

〔Effect of the invention〕

The present invention has two sets of scroll cams provided with reciprocating helical grooves each consisting of a substantially linear forward guide groove and a return turn groove having rounded portions at both ends facing each other, and two sets of thread guides that engage with each reciprocating helical groove. The sets are arranged so that the thread path of the traverse is common, and a synchronized drive mechanism of the scroll cam is provided to make the outward guide groove of one scroll cam and the return turn groove of the other scroll cam run in parallel, and the thread guide is moved in the opposite direction of the guide. Since the thread guide has an inclined side to prevent the thread from getting caught, and thread removal guides are provided on both sides of the actual winding width, the thread guide does not grip the thread at the R part and forms a thick (gentle turn groove) to prevent wear of the thread guide. This makes it possible to make the yarn wound around the bobbin more uniform by making constant acute angle turns regardless of the yarn tension, thereby preventing selvage height.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the traverse device of the present invention, FIG. 2 is a top view of the traverse device, FIG. 3 is a developed view of each scroll cam, and FIG. 4 is a composite transfer developed view of the reciprocating helical groove of each scroll cam, Fig. 5 shows the thread guide, Figs. 6 and 7 show the operation of the thread guide, Fig. 8 shows the reciprocating helical groove of a conventional traverse drum, and Fig. 9 shows a conventional traverse device. The perspective view shown in FIG. 10 is an operational diagram of a conventional traverse device. lO...First guide groove l...First turn groove 2...Second turn groove 3...Second guide groove 4...Yarn guide 5...Yarn guides 6a, 16b... Scroll cam 0...Slanted sides 4, 25...Thread removal guide

Claims (1)

[Claims] (1) In a yarn traverse device in which a yarn guide is engaged with a scroll cam having a reciprocating helical groove for reciprocating movement, the reciprocating helical groove is made up of a substantially straight forward guide groove and a backward turn groove having rounded portions at both ends. The two sets of scroll cams provided face each other, and the two sets of thread guides that engage with each reciprocating helical groove are arranged so that the traverse thread path is common, and the outgoing guide groove of one scroll cam and the other scroll cam A synchronous drive mechanism for scroll cams that run parallel to the return turn groove is provided, the thread guide has an inclined side in the direction opposite to the guide to prevent thread hooking, and thread removal guides are provided on both sides of the actual winding width. Thread traversing device.