JPS6260783A - Grooved bobbin - Google Patents

Abstract

PURPOSE:To catch yarn to be drawn out at superhigh speed without fail as well as to make it windable on a bobbin, by installing a yarn hook groove being nicked in V-shaped form, in a circumferential direction of the vicinity of a bobbin end part, and forming this groove into a zigzag form. CONSTITUTION:When a bobbin 2 winds yarn automatically, the yarn 7 is drawn out in a thick arrow direction, and a rotation direction of the bobbin 2 is directed at the arrow. And, when the yarn 7 comes into contact with a guide surface 3 of a yarn stop groove 1 of the bobbin 2, it is guided to a hook groove 4, hooked on a projecting strip 5 or bobbin in it, thus it is held thereat. If so, the yarn 7 is turned over of its moving direction in a rotational direction of the bobbin 2, and impactive tension at that time acts on the yarn whereby it is bitten in a V-shaped groove so that the yarn is surely caught and held thereat. The previous yarn 8 caught is cut off in a moment by dint of attraction force as in vacuum or the like and impact force by the said turnover. And, the yarn 7 held takes a U-turn and turns together with the bobbin 2, thus it is wound on the bobbin 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field of the invention] The present invention provides a process for manufacturing bobbins, particularly synthetic fibers, in which:
This relates to a bobbin that has the characteristic of automatically winding the end of a thread moving at high speed around the bobbin.

[Prior art]

In the production of synthetic fibers, there are several methods, ranging from the classical method of drawing undrawn yarn obtained through a spinning process using a drawing machine.
This has evolved into the direct spinning/drawing method (DSD method), which directly connects the process of continuous drawing to spinning, and in recent years has further developed into the high-speed spinning method (spin draw method), which produces drawn yarn by spinning at high speed. .

By the way, in the direct spinning and drawing method, the winding speed of the yarn is as high as 2,000 to 3,000 m/min, and in the high-speed spinning method, the winding speed is as high as 5,000 to 7,000 m/min.
It has become extremely fast.

It is no longer possible to wind yarn that is spun at such high speed onto a bobbin using manual threading methods, so automatic threading machines and robots have come to be used.

In order to reliably thread the thread onto the bobbin without manual intervention at such ultra-high speeds, the problem is how to quickly and reliably grip the thread end on the bobbin.

Various bobbins have been developed for automatic threading work. IttJi Motoyama has made many developments regarding this type of bobbin, and has already proposed a bobbin as disclosed in Japanese Utility Model Application Publication No. 59-91258 and others.

In this invention, a V-shaped thread retaining groove formed at the end of the bobbin is partially offset from the center so that the thread is caught at that part.

The bobbin of the above invention has a thread winding speed of 2000 to 30
It has been confirmed that a good thread gripping effect is exhibited up to about 00 m/min. However, if the yarn winding speed exceeds the above range, the yarn gripping rate or yarn capture rate tends to decrease. If the thread gripping rate decreases, it will naturally cause trouble in the spinning process, and the amount of thread wound onto the bobbin will fluctuate, so in some cases, the production of synthetic fibers by that spindle may have to be stopped until the next spinning starts. figure,
This will cause major production troubles and losses.

[Purpose of the invention]

The present invention solves the drawback of the conventional bobbin having a thread-holding groove, which is that the thread moving at ultra-high speeds is somewhat uncertain in its ability to capture and grip the thread, and even at ultra-high speeds, the end of the thread is stopped. It is an object of the present invention to provide a grooved bobbin that can be instantly gripped by the groove and can be wound reliably.

[Structure of the invention]

In order to achieve the above object, the grooved bobbin of the present invention has a thread hooking groove cut in a V-shape in the circumferential direction near the end of the bobbin, and a gentle groove adjacent to the center side of the bobbin at least. The hooking groove has an inclined thread guiding surface, and protruding lines in the depth direction that reach the bottom alternately are provided on both left and right side surfaces of the hooking groove.

〔Example〕

Next, the present invention will be specifically described by way of examples with reference to the drawings.

FIG. 1 shows a bobbin 2 provided with a thread guide surface and a thread stopper groove 1 equipped with a hooking groove (not shown), which is a requirement of the present invention.
FIG. 2 is a perspective view of the thread retaining groove 1, and the details of the thread retaining groove 1 will be explained with reference to FIGS. 2 to 5.

The thread stopper 1 is provided with a guide surface 3 whose cross section perpendicular to the groove has a gentle slope, and a hook groove 4 which is relatively deep with respect to the V-shaped opening width approximately at the center thereof. A hook groove 4 is formed on the surface of the hook groove 4 in the radial direction of the bobbin 2.
Projecting stripes 5 reaching the bottom are provided alternately at regular intervals.

Therefore, the inside of the hooking groove 4 has a zigzag shape due to the protruding stripes 5, and this is shown in cross-sections of the hooking groove 4 in FIGS. 3 to 5. That is, these drawings show, in order from FIG. It will be understood from these figures that the bottom of the hooking groove 4 is narrow and has a zigzag shape. That is, the hooking groove 4 is configured so that the protruding line 5 reaches the bottom of the groove, so that the opening on the outside is wide, and the resistance to the thread increases as it approaches the bottom due to the zigzag pattern.

Next, the manner in which the bobbin 2 of this embodiment automatically winds up yarn will be explained with reference to FIGS. 6 to 8. The thread 7 to be wound around the bobbin 2 is pulled out at high speed in the direction indicated by the thick arrow, and the rotation direction of the bobbin 2 is the direction of the arrow.
That is, on the side in contact with the thread 7, it rotates so as to move in the opposite direction to the thread.

When the thread 7 comes into contact with the guiding surface 3 of the thread stop groove 1 (not shown) provided on the bobbin 2, it is guided into the hooking groove 4 by the guiding surface 3, and is caught on the protruding line 5 or bites into it. It is grasped by. Then, the moving direction of the thread 7 is reversed in the direction of rotation of the bobbin 2, but the impact tension at that time acts on the thread and bites into the V-shaped groove, and the thread is securely caught and gripped by the thread 2. The captured thread 8 is instantly separated by the force of being pulled by a vacuum or the like and the impact force caused by the reversal, and the captured thread 7 makes a U-turn and joins the bobbin 2 as shown in FIG. After that, it is wound onto the bobbin 1 as shown in FIG. 8.

As described above, by forming the hooking groove 4 in a zigzag shape, it is possible to reliably catch the thread pulled out at an extremely high speed and wind it onto the bobbin.

The shape of the protruding stripes 5 can be modified in various ways to make it easier to catch the thread. That is, FIGS. 9 and 10 each show an embodiment using a thread stopper Tfil different from that shown in FIG. 1, and the arrows in the figures indicate the rotation direction of the bobbin 2.

The protruding muscle 5 in FIG. 9 has a front end 9 in the rotational direction that rises suddenly, and a rear end 10 that is gently sloped. Therefore, the thread 7 that has entered the hooking groove 4 is easily caught by the protruding stripes 6. The rising angle of the front end portion 9 can be made acute if necessary.

The protruding strip 5 shown in FIG. 10 has a shape in which the rising portion of the front end 9 is cut into a slit shape so that the thread can be easily captured. These modifications can be utilized when it is necessary to strengthen the catching force or gripping force of the bobbin 2 by applying a lubricant to the thread or the like.

The thread retaining groove l of the present invention does not need to be provided on the entire outer circumference of the bobbin 2, and usually only needs to be about ⅓ of the circumference of the bobbin 2.

When the bobbin 2 is made of paper, the thinner the wound yarn 7 becomes, the more the innermost layer yarn becomes the outermost layer paper of the bobbin 1 when the yarn is unwound during rewinding of a single yarn. It gets caught on the exposed cut edge 13 of the polymerized adhesive part 12, causing further problems such as uneven tension of the thread 7, single thread breakage, flapping, etc.

In order to prevent this, when using the grooved bobbin of the present invention, as shown in FIG. This can be prevented by making the rotation direction opposite to the direction of rotation) and the forward direction. This is the second
When the hooking groove 4 has no direction as shown in the figure, it is only a precaution when using it, but as shown in Fig. 12, the protruding line 5
It is an essential requirement for the implementation of the present invention to have directionality.

If the grooved bobbin of the present invention is made of paper, the shape and dimensions of the thread retaining groove will vary slightly due to the unique properties of paper and will not necessarily be constant. was recognized.

It is recognized that the guiding surface 3 of the present invention not only has the function of guiding the thread into the hooking groove 4, but also has a guiding function when the thread is returned to the center of the bobbin by a traverse (not shown). Therefore, it is necessary to provide the hook on the inside of the hook groove 4, and it is also provided on the outside if necessary, but usually it is provided on both sides.

Further, the thread stopper >a1 of the present invention can also be provided within the punch groove.

In order to provide the thread stop groove 1 on the bobbin 2, it is preferable to cut the thread stop groove 1 by cutting the bobbin 2 with a knife. The width, depth, and length of the thread stopper groove 1 of the present invention, the shape and spacing of the protruding lines provided on the wall surface, etc., depend on the usage conditions such as the thickness and material of the thread used, and the winding speed of the thread. It may be determined as appropriate.

〔Effect of the invention〕

As described above, the grooved bobbin of the present invention has the above-mentioned structure in which the cross section is V-shaped and has a zigzag shape, thereby making it possible to efficiently move yarn at ultra high speeds reaching 5,000 to 7,000 m/min. Hook it well on the bobbin,
This makes it possible to securely grip and secure the thread on the bobbin. Therefore, it is possible to effectively carry out the above-mentioned spin draw method at ultra-high speed, which was difficult to fix the thread in the past.
It can contribute to improving productivity.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention.
The figure is a perspective view of a bobbin used in the manufacturing process of synthetic fibers, Figure 2 is an enlarged development view of the thread stopper groove in Figure 1,
Figures 3 and 4. Figure 5 shows lines A-A, line B-B, and C-C in Figure 2, respectively.
6, 7, and 8 are explanatory diagrams showing the stroke in which the bobbin in FIG. 1 grips the thread, and FIG. 9, and FIG.
11 is a partial perspective view showing the relationship between the thread stopper groove of the cardboard laminated bobbin and the polymerization bonding part. FIG. FIG.

Claims (1)

[Claims] A thread hooking groove cut in a V-shape in the circumferential direction near the end of the bobbin, and a gently sloped thread guiding surface adjacent to the groove at least on the center side of the bobbin, are provided on the left and right sides of the hooking groove. A grooved bobbin characterized by having protruding lines in the depth direction that alternately reach the bottom on both sides.