EP0761586A2

EP0761586A2 - Yarn winding device

Info

Publication number: EP0761586A2
Application number: EP96113021A
Authority: EP
Inventors: Tomoki Yamanaka; Kazuyasu Hirai
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 1995-09-01
Filing date: 1996-08-13
Publication date: 1997-03-12
Also published as: EP0761586A3; JPH0967066A

Abstract

A yarn winding device that processed yarn so it does not seperate from the package or be pulled out or catch on parts during the doffing operation.

A yarn winding device (1) that winds yarns (Y10,Y1,Y1a) arranged with yarn end processing means (10a,10b) that splay the yarn end (Yt) so that the cut yarn end (Yt) does not seperate from the package (P).

Description

FIELD OF THE INVENTION

The present invention relates to a yarn winding device for traversing and winding a yarn.

PRIOR ART

Conventionally, a winding device that winds yarn has been known that holds a bobbin on a pair of left and right bobbin holders that are supported on a cradle arm so as to be freely rotating, rotates that bobbin by contact with a friction roller and winds yarn as a package while traversing that yarn.
When a package becomes full on such a winding device, the yarn is cut by a blade mid-traverse and a doffing operation such as the subsequent ejection of the full package onto a belt conveyor behind the winding device is carried out.

PROBLEMS TO BE SOLVED BY THE INVENTION

However, as shown in Figure 5, when doffing is carried out, the yarn end Ytz of the full package yarn Y1z cut by a conventional device is cut with the fiber bundles in an ordered state. Due to this, the yarn end of the full package does not obtain a state where it attaches to the package, and hangs from the package surface. If doffing is carried out in a state where the yarn end hangs from the package surface, the yarn end may catch on parts located around the doffing operation and the yarn may be pulled off from the package.
Furthermore, the yarn hanging from the package may be caught in a bobbin being wound causing a reduction in the quality of the winding packages or causing yarn breakage.
It is an object of the present invention to propose a yarn winding device that solves the defects present in conventional devices and prevents the yarn end seperated from the package from catching on parts in the vicinity of the doffing operation and from being pulled out.

SUMMARY OF THE INVENTION

In order to achieve the aforementioned object, a yarn end processing means for splaying the yarn end so that that cut yarn end does not seperate from the package is arranged on the yarn winding device that winds a yarn. Due to this, the yarn of the cut yarn end in the splayed state catches the yarn of the package and does not seperate from the package.
Furthermore, a guide part which leads the traversing winding yarn to the yarn cutting part is provided and a yarn end processing means is arranged in that guide part. Due to this, when the package is full, processing is carried out so that a predetermined length of yarn end from the cutting part is splayed by a process that leads the traversing winding yarn to the cutting part in order to be cut.
Yet further, in addition to the above, a zigzag part is formed in the aforementioned guide part as a yarn end processing means. Due to this, immediately before the running yarn which is to be wound reaches the cutter part, it is rubbed by the zigzags of the guide part that leads the yarn to the cutter part and is splayed.
Yet further still, as a yarn end processing means for splaying the aforementioned yarn end, a raising device that positively raises the yarn end is arranged. The hairiness of this raising prevents play of the yarn end by entangling it in the package surface.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a plan view showing the entire structure of the yarn winding device being an embodiment of the present invention.
Figure 2 is a side view of figure 1.
Figure 3 is a plan view showing details of the cutter part.
Figure 4 is an expanded view of the yarn end that has been cut and yarn end processed on the yarn winding device of the present invention.
Figure 5 is an expanded view of the yarn end that has been cut and yarn end processed on a conventional yarn winding device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Below, with reference to the drawings, one embodiment of the present invention will be described.
Figures 1 and 2 show one embodiment of the yarn winding device relating to the present invention.
In Figure 1, a yarn winding device (1) winds yarn (Y) while traversing it with a traverse guide (6) onto a bobbin (B) that is held on either side by a pair of bobbin holders (4) (shown simplified on the right of the drawing) supported freely on a cradle arm (3) and that rotate by being in contact with a friction roller (5).
The bobbin holder (4) is arranged with a cylindrical projecting part (40) that inserts in the open end of the bobbin (B) and a rim (41) projecting from the periphery of that projecting part (40) which contacts the end of the bobbin (B) and supports that bobbin (B) in the axial direction, is arranged with another rim (42) to the side of that rim (41) opposite the bobbin (B) and comprises a groove (43) running all the way around the bobbin holder (4) between these rims (41,42).
As shown in Figure 2, two yarn threading parts (41a,41a) are formed in the rim (41) by being cut out sections of the outer circumference spaced 180 ° apart. Those yarn threading parts (41a,41a) are cut out slanting toward the rotational direction of the bobbin holder (4) as wedge shapes and the deepest part is above the part of the rim (41) that contacts the bobbin (B) and reaches as far as the projecting part (40).
Furthermore, yarn threading parts (not shown in the drawing) formed as cut away parts are arranged in the rim (42) and are skewed by a predetermined angle rearwards in the bobbin rotation direction with respect to the aforementioned yarn threading parts (41a,41a). The yarn threading part (not shown in the drawings) of the rim (42) is cut away sufficiently shallowly within a range where threading of the yarn (Y) is possible.
Yet further, a fixed blade (31) is arranged positioned in the groove (43). That fixed blade (31) is affixed to the cradle arm (3).
On the yarn introduction side of the yarn winding device (1), a yarn threading part (2) is arranged with a yarn threading arm (20) comprising yarn catchers (21,22) on its tip that can rotate beyond the yarn (Y) traverse range. As shown in Figure 2, that yarn threading arm (20) is fixed to the drive shaft of the rotary actuator (24) fixed to the bracket (23) and rotates around the center of the drive shaft of the rotary actuator (24) due to the movement of that rotary actuator (24).
As shown in Figure 1, the yarn threading part (2) reciprocally moves through a 180° range between a standby position (20a) shown by the double dotted line and a yarn threading position (20) shown by the solid line in the same drawing. As examples of a rotary actuator (24), a hydraulic swivel motor or rotary solenoid can be used or the reciprocal movement of a rectilinear hydraulic cylinder may be converted to a rotating movement by a rack and pinion system.
The yarn catchers (21,22) rotate due to the rotation of the aforementioned yarn threading arm (20) but one yarn catcher (22) projects to a relatively small radius that does not intersect with rims (41,42) of the bobbin holder (4) whereas the other yarn catcher (21) is positioned on the right hand side of Figure 1 with respect to the aforementioned yarn catcher (22) and moreover, projects to a relatively large radius that would intersect with the aforementioned rims (41,42) along a extrapolated line of the rotation curve.
Furthermore, as shown in Figure 2, each yarn catcher (21,22) is arranged on the lower end of a bent part being the tip of the yarn threading arm (20) bent downwards, prevents the yarn (Y) caught on each yarn catcher (21,22) from intertwining with the yarn threading arm (20), are hook shaped and are positioned facing away from each other. It should be noted that the tip part of the yarn threading arm (20) shown in Figure 1 comprises a seperate structure and is fixed in entirety to the basal side by a bolt (26) through a long hole (25). Adjustment of the position of yarn catchers (21,22) corresponding to the diameter of the bobbin (B) (or the bobbin holder (4)) is possible. Also, (27) and (28) are stoppers.
On the yarn introduction side of the yarn winding device (1), a cutter (9) and suction pipe (8) are arranged as shown in Figures 1 and 2. The suction pipe (8) is open ended on the lower side of the cutter part (9) in the drawings and an open window (12) is present in that part of the cutter plate (9a).
Next, the operations of the yarn winding machine (1) at doffing times will be described based on the embodiment.
When the package (P) becomes full, the yarn (Y1) which is traversing and being wound is cut by the cutter (9). The cut yarn (Y1a) is wound onto the package (P). The other cut yarn that is the introduced yarn (Y1b) is sucked and held in the suction pipe (8). The detailed yarn cutting operations performed by the cutter (9) will be described hereafter. In continuance, the cradle arm (3) swivels backwards (to the left of Figure 2) and opens and the full package (P) is ejected onto the belt conveyor (not shown in the drawings) behind the yarn winding device (1).
Furthermore, an empty bobbin (B) is supplied from above by a supply means not shown and is attached to the bobbin holder (4). The cradle arm (3) then swivels in a clockwise direction in Figure 2, the empty bobbin (B) is contacted with the friction roller (5) and due to this, the empty bobbin (B) and bobbin holder (4) start rotating.
From this state, the rotary actuator (24) operates and the yarn threading arm (20) moves in the direction of the arrow a in Figure 1 from the standby position (20a) shown in Figure 1. By this process, the yarn (Y1b) held in the suction nozzle (8) is held at the yarn catcher (22a) on the foward side of the proceeding direction and furthermore, the yarn (Y1b) being continuous from the yarn catcher (22a) to the supply yarn side is held by the yarn catcher (21a) by a process being the further rotation of the yarn threading arm (20) in the standby position (20a) in the direction of the arrow (b) as shown in Figure 1.
At the end of the yarn threading arm (20) rotation, one yarn catcher (22) moves past rim (42) and is positioned on the outer side. The other yarn catcher (21) is positioned on the bobbin side of the rim (41). The yarn caught by these two yarn catchers (21,22) is guided to the bobbin holder (4) side as shown by the solid lines (Y2,Y3,Y4) in Figure 1.
Thus, the yarn (Y3) stretched at an angle between the aforementioned two yarn catchers (21,22) firstly makes contact with the rim (41), catches the yarn threading part (41a) and is pulled as far as the deepest part of the yarn threading part (41a) due to the rotation of the bobbin holder (4). Due to this, the yarn (Y3) of the supply side of that yarn threading part (41a), in short, the yarn catcher (21) side is caught between the rim (41) and the end surface of the bobbin (B).
In parallel with this, the yarn (Y3) of the yarn catcher (22) side of the yarn threading part (41a) catches on the yarn threading part (not shown in the drawings) of the outer rim (42). The yarn (Y3) stretched at an angle between this yarn threading part (41a) and the yarn threading part (not shown in the drawings) of the rim (42) reaches the fixed blade (31) in conjunction with the rotation of the bobbin holder (4), is cut by that fixed blade (31) and the cut yarn end (Y2) is removed by being sucked by the suction pipe (8).
In continuance, the yarn threading arm (20) stops for a short period in the aforementioned yarn threading position and while the supply side yarn (Y4) is being guided by the yarn catcher (21) as shown in Figure 1, a bunch winding is carried out. After formation of a predetermined bunch winding, the yarn threading arm (20) rotates in a counter clockwise direction as shown by the arrow (b) in Figure 1 and returns to the standby position (20a). Mid-point, at position (20b), at the point when the yarn catcher (21b) and the yarn (Y5) transferred to the bobbin (B) are approximately parallel, that yarn (Y5) seperates from the yarn catcher (21b), drops as far as the normal running position is held in the traverse guide (6) and moves to the main winding.
Next, the cutter part (9) of the yarn winding device (1) will be described in detail. Figure 3 is a plan view showing the details of the cutter part (9).
The cutter part (9) comprises a cutter plate (9a) and a cutting blade (11) fixed to that cutter plate (9a). A window (12) is open in the suction pipe position of the cutter plate (9a). Also a guide part (7) that guides the traversing yarn (Y0) to the blade (11) in formed on the package (P) side of the cutter plate (9a).
As shown in Figure 2, the cutter plate (9a) is supported so that it can rotate about a shaft (9d) and due to this, has a position being the standby position below the yarn path of the traversing yarn (Y0) shown as a solid line in Figure 2 and a position being the operational position where the guide part (7) projects into the yarn path of the traversing yarn (Y0) as shown by double dotted line in Figure 2.
The guide part (7) contains a guide line (10c) that guides the traversing yarn (Y0) to the right of the drawing when in the operational state, and a guide groove (10d) that guides the traversing yarn (Y0) to the left of the drawing to the cutting blade (11) when in the operational state. The cutting blade (11) is arranged on the inner part of the guide groove (10d). Edges (10a,10b) on each side that comprise the guide groove (10d) contact the yarn (Y0) guided into the guide groove (10d). A zigzag is formed on these edges (10a,10b) and comprise the yarn end processing means.
Next, the detailed operations of the cutter part (9) will be described.
When the package (P) becomes full and doffing is necessary, the arm (9b) shown in Figure 2 is pulled in the direction of arrow (9c) by a drive source (not shown in the drawings). Accompanying this, the cutter plate (9a) rotates to the right of the drawing about the point (9d). Then, the cutter plate (9a) swivels upwards as shown by the double dotted line in Figure 2. The guide part (7) is then positioned at (7a) as shown by the double dotted line in Figure 2 and juts into the yarn path of the traversing yarn (Y0).
Then, as shown in Figure 3, the traversing yarn (Y0) is led into the guide part (7). The yarn (Y0) led into the guide part (7) traverses to the cutting blade (11) position (the position of (Y1)) while sliding on the zigzag parts (10a,10b) arranged in guide groove (10d) of the guide part (7). During this time, the fibers of the yarn sliding over the zigzag parts (10a,10b) are cut by the zigzag parts (10a,10b) and processed so that they are splayed. Then the processed yarn contacts the cutting blade (11) and is cut into yarn (Y1a) and yarn (Y1b).
As the yarn (Y0) in contact with the zigzag part (10a,10b) runs at a predetermined speed, a predetermined length of running yarn passes over the zigzags (10a,10b) and can be processed so as to be splayed until it is cut by the cutting blade (11). The package (P) side yarn (Y1a) is wound onto the package (P) from the cutting blade (11) and the supply side yarn (Y1b) is sucked and held in suction pipe (8) from the cutting blade (11).
In continuance, the package (P) wound with yarn (Y1a) is ejected onto a belt conveyor (not shown in the drawings) to the rear (left hand side of Figure 2) of the yarn winding device (1).
It should be noted that when the yarn is traversing to the right of Figure 3, it slides along the guide edge (10c) ofthe guide part (7) of the cutter plate (9a) shown in Figure 3 when the cutter plate (9a) swivels upwards as shown by the double dotted line in Figure 2. Then, when the yarn has traversed to the left as shown in Figure 3, the yarn is led into the guide groove (10a) of the guide part (7) and processed and cut as previously described.
Figure 4 shows the yarn (Y1a) and the yarn end (Yt) cut and processed as described above. The yarn end (Yt) of the yarn (Y1a) covers a predetermined length, the filament fibers comprising the yarn (Y1a) are cut and the yarn end (Yt) is in a splayed state (with hairiness). As this yarn end (Yt) is wound onto the yarn layer of the package (P) at times of doffing, the fuzzy fibers entwine into the yarn surface of the package (P) and the yarn end does not seperate from the package (P). Due to this, the yarn end of the package (P) is prevented from catching on nearby parts during the doffing operation and pulling of the yarn is also prevented.
It should be noted the aforementioned embodiment shows one example embodying an individual auto-doffing device with a yarn threading part (2) arranged on each spindle but the same device can also be embodied as a moving auto-doffing device that is arranged on a vehicle that moves between every spindle.
Furthermore, the above described embodiment shows a case where yarn threading is automatically carried out by the yarn threading device (2) but the yarn winding device of the present invention is also effective if yarn threading is carried out manually using some other yarn threading device or a suction gun or the like.
In addition, on the above embodiment, the yarn end processing means comprises zigzag parts (10a,10b) on the guide part (7) of the cutter plate (9a) but the following embodiment is also possible. For example, the arrangement in a place seperate from the aforementioned cutter plate (9a) of a raising device that produces hairiness by rubbing the yarn (Y1) and extension of the splayed part (fuzzy part) due to cutting of the yarn by operation of the cutter plate (9a) after the production of raises by the raising device over a predetermined period of time.
An arrangement according to a first aspect of the present invention where the hanging or seperation of the yarn end from the package can be prevented due to the entwining of the yarn end cut in a splayed state into the package yarn. Afterwards, the package is ejected onto a belt conveyor used for transportation of packages and during transportation, the yarn end is prevented from catching on parts around the doffing operation and being pulled at length from the package. Thus the generation of wastful yarn by it being pulled from the package can be removed.
In addition, problems such as the yarn hanging from the package causing a reduction in the quality of the package during winding by entwining in the next winding bobbin (or package) or interrupting the winding operation can be prevented.
Furthermore, the yarn being wound on the package can be yarn end processed at the same time as being traversed and processing so that a predetermined length of the yarn end is splayed is possible.
Yet further, as yarn end processing can be carried out simply with the traversing power, it is only necessary to arrange zigzags on the guide part and there is no need for a seperate yarn end processing device.

Claims

A yarn winding device that winds yarn comprising:
a yarn end processing means for splaying the yarn end so that that cut yarn end does not seperate from the package.
A yarn winding device as claimed in claim 1, provided with a guide part that leads the yarn that is traversing and being wound to the yarn cutting part and arranged with a yarn end processing means in that guide part.
A yarn winding device as claimed in claim 2, wherein that guide part comprises a zigzag part as a yarn end processing means.
A yarn winding device as claimed in claim 1, wherein the yarn end processing means that splays the yarn end is a raising device that positively raises hairs in the yarn end.