JPH0415745Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The present invention relates to an improvement of a double bobbin consisting of a base cylinder and an outer cylinder fitted and laminated on the surface of the base cylinder.
In particular, the present invention provides a bobbin in which a thread stopper can be easily formed.

[Prior art]

Relatively inexpensive bobbins for non-recoverable purposes, such as bobbins for winding yarn for domestic use as well as for export, use a paper cylinder bobbin body made by laminating multiple layers of paperboard as the main material. A thread retaining groove is cut into the end portion in the shape of a notch.

The amount of winding of the bobbin is determined by the rotation speed of the spindle of the winder installed and the winding time.
In recent years, larger bobbins with increased winding capacity, so-called large package bobbins, have been adopted in order to improve fiber productivity. In this way, the bobbin has become larger and the winding amount has increased,
Generally, they are designed so that they can only be used once.

By the way, in order to effectively utilize materials, it is desired to use a large paper tube bobbin multiple times, but if this bobbin is used more than once, various inconveniences will occur. That is, the outer diameter of the bobbin may be reduced due to the winding pressure of the yarn, and in some cases, vertical wrinkles may occur on the surface.

The reduction in the outer diameter of the bobbin not only reduces the winding amount under constant rotation compared to a new bobbin, but also
The tension at the time of winding decreases and the winding conditions become different, and as a result, the quality of the yarn is affected, which is not preferable.

Further, vertical wrinkles occurring on the surface of the bobbin mean that the strength of the bobbin is reduced, and if the bobbin is reused, buckling will occur due to the pressure of the wound yarn. Furthermore, when the yarn is wound onto the bobbin and a large pressing force is applied, the bobbin deforms into a drum shape, and the shape of the end changes accordingly, making it unstable to attach to the spindle of the winding machine. Stable winding becomes difficult due to rattling or runout.

By the way, the paper tube bobbin has a notch-shaped thread stopper cut into the end of the bobbin, but this thread stopper is inserted when the package is being handled or when the bobbin is shaped like a drum as mentioned above. When the bobbin is deformed, its shape also changes, reducing the thread fixing effect, and even if the bobbin is reusable, it becomes difficult to reuse it due to a defective thread fixing part.

In addition, the method of forming a notch-shaped thread stopper at the end of a paper tube bobbin is to cut it with a knife, but this knife must be strong and precisely machined, and must be sharp. Because sharp cutlery is used, there is a problem in that the blade is chipped during machining and the life of the cutter is shortened.

Furthermore, in Japanese Utility Model Publication No. 54-25474, the end of the bobbin, which is the edge of the yarn being wound, is described in which the outer periphery of the core tube made of a hard material is coated with an elastic material such as sponge, rubber, or polystyrene. A cut groove is formed in the circumferential direction of the bobbin at a position slightly closer to the center of the bobbin, which passes through the elastic material from the outside of the bobbin and reaches the core tube, communicating as if it were a single cut. A bobbin with a heavy structure has been proposed.

However, the grooves formed in the elastic material on the outer periphery of the bobbin and the grooves formed in the core tube are formed as a pair, and unless they match perfectly, they will not function as a thread stopper. Even if you try to reuse the core tube by peeling off the damaged elastic material after using this bobbin once, the grooves in the new elastic material and the grooves in the core tube will be completely integrated by fitting the two bodies together. On the other hand, if a new cut groove is formed that reaches the core tube from above covered with a new elastic material, there is a problem that the strength of the core tube itself decreases.

In addition, since the outer periphery of the core tube is covered with the elastic material described above, the winding pressure increases in proportion to the increase in the amount of yarn loaded, and this pressing force causes the elastic material to move in the axial direction of the bobbin. There was a problem that a cold flow phenomenon occurred in which the core tube was stretched and protruded from both ends of the core tube, and the kerfs in the core tube and the kerfs in the elastic material did not match, resulting in a loss of yarn fixing function.

Furthermore, in order to integrate the core tube and the elastic material without slipping, a gap may be provided between the core tube and the elastic material, and a rubber O-ring may be interposed in this gap. When a protrusion for mutually locking is formed on the core tube, there is a problem that the thread becomes difficult to be held in the groove of the core tube.

[Purpose of invention]

The present invention was achieved in order to solve the problems of the conventional bobbin, and provides a bobbin that can withstand multiple uses and that can maintain the thread stopper well. It is in.

Another purpose is that the base cylinder and the outer cylinder are separate bodies, and the outer cylinder can be replaced and used multiple times.
To provide a bobbin in which a thread stopper can be easily formed.

Another purpose is to use a material suitable for the pressure of the thread on the outer cylinder on which the yarn is wound, and to use a material suitable for the bearing of the pressure on the base cylinder that bears the winding pressure. It provides a double bobbin using the material.

[Summary of the idea]

The double bobbin according to the present invention for achieving the above object is composed of a base cylinder and an outer cylinder fitted onto the surface of the base cylinder, and has a wide notch at the end of the base cylinder. In addition, the outer cylinder has a narrow thread stopper that holds the thread end, extending from one end to the other end and opening within the projected area of the notch.

That is, the bobbin according to the present invention has a double structure including a base cylinder and a thin outer cylinder fitted onto the surface of the base cylinder. A notch-shaped thread stopper is cut into the end of this thin outer cylinder, but the thread stopper is not cut all the way to the base cylinder. A notch is opened at the end of the base barrel at a position overlapping the thread stopper, and has a projected area that surrounds the thread stopper and is wider than the thread stopper.

In other words, the thread stopper is formed in the thin outer cylinder, and the escape part is formed on the base cylinder side so that the thread can be guided to the thread stopper. This relief part has a shape suitable for cutting, and as a result, the thread stop part can be freely formed only on the thin outer cylinder side.

In addition, if you want to peel off the outer cylinder and reuse the base cylinder after using this double bobbin, fit the outer cylinder onto the surface of this base cylinder and use the wide width formed on the base cylinder. The thread stopper can be punched out using a punching machine equipped with a mold shaped like the thread stopper so that it is located within the projected area of the notch.
The thread stopper can be easily formed using the cutout part that does not require a thread stopper function as a mark.

Furthermore, as mentioned above, this double bobbin allows a narrow thread stopper to be formed with a certain width within the range that overlaps the projected area of the wide notch. Even when an elastic material that is easily deformed by the winding pressure of the yarn is used for the tube, the deformed thread stopper does not come off from the notch and does not lose its function as a thread stopper.

The base cylinder is made of a material that has the strength to withstand multiple uses, such as ABS, hard vinyl chloride, synthetic resin cylinders such as Bakelite, paper cylinders, metal cylinders, and synthetic resin cylinders. A cylindrical body used as a bobbin material, such as a composite tube with a paper tube, can be used.

The outer cylinder is made of a thinner paper cylinder than the conventional single material paper cylinder bobbin, a synthetic resin cylinder, a metal or paper cylinder wrapped in film, or a laminated structure of aluminum foil and paper. It is possible to use a bobbin jacket material made of a cylindrical body using a sheet of.

Since the outer cylinder is in direct contact with the yarn,
The surface can be treated to prevent yarn slippage. Examples of such processing include uneven portions, many fine grooves, and thin convex lines.

The end of the outer cylinder is processed by the process that is applied to the outer cover of a normal bobbin, for example, bending process F as shown in Figure 10A, round bending process C as shown in Figure 10B, or process performed on the outer cover of a normal bobbin. As shown in the figure, various processing such as rounding R or chamfering can be performed.

In addition, in order to fit the base cylinder and the outer cylinder that fits on this surface, usually the base cylinder 1 is forcibly inserted into the outer cylinder 2, or the outer cylinder is inserted into the outer cylinder as shown in FIG. 11A. 2, or a rubber O-ring 2 is formed between the base cylinder 1 and the outer cylinder 2 as shown in FIG. 11B.
1, or furthermore, by forming a spiral convex line 22 on the surface of the base cylinder 1 as shown in FIG. It is possible to eliminate slippage and achieve integration.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG. 1 is a partially cutaway front view of a double bobbin according to a first embodiment of the present invention, and FIG. 2 is a side view of the same.

The double bobbin B is composed of a base cylinder 1 and an outer cylinder 2 fitted on the surface thereof, and a slit-shaped thread stopper 3 is formed at the end of the outer cylinder 2. A notch 4 is formed at the end of the base barrel 1 at a position overlapping the thread stopper 3, with a projected area that surrounds the thread stopper 3 and is wider than the thread stopper 3. ing.

As shown in detail in FIG. 3, the thread stopper 3 is a V-shaped slit cut sharply into the end of the outer cylinder 2 in a diagonal direction. A V-shaped notch 4 is formed at the end of the thread stopper 1 with a projected area that surrounds the thread stopper 3 and is wider than the thread stopper 3.

When using the double bobbin according to the present invention, the thread Y is introduced from the outer cylinder 2 side, that is, from the front surface to the back surface of the thread stopper part 3, and the end y extends to the notch part 4 at the thread stopper part. It is held in the narrow part of 3.

The outer cylinder 2 of this embodiment is a paper cylinder made by laminating three layers of paperboard with a thickness of 0.3 mm, and its end has a maximum width of about 2 mm and an angle of about 60 degrees with respect to the end surface of the bobbin. A thread stopper portion 3 is formed by cutting into an acute V-shape.

As a method of cutting the thread stopper 3, a punching machine device equipped with a mold having the shape of the thread stopper was used.

Embodiment 2 As shown in FIG. 4, a U-shaped notch 4 is formed at the end of the base cylinder 1, and the end of the outer cylinder 2 is formed so as to fit within the width of the projected area of the notch 4. There is a thread stopper 3 at a position overlapping the notch 4.
is formed.

This thread stopper part 3 is made by making an acute-angled cut from the surface of the outer cylinder 2 to approximately the thickness of the body at an angle to the end face of the bobbin B, with the end face being the deepest and facing toward the center of the bobbin. It is gradually becoming shallower.

Embodiment 3 FIGS. 5 and 6 show a third embodiment, in which a thread stopper 3 is cut into the back surface of the end of the outer cylinder 2 to the extent that a portion of its thickness remains. and
The yarn end y of the yarn Y is gripped from the front surface to the back surface.

The notch 4 provided in the base cylinder 1 is U-shaped in this embodiment, but the thread stopper 3 provided in the outer cylinder 2 fits within the projected area of this notch 4. If so, I don't care about the shape.

Embodiment 4 As shown in FIGS. 7 and 8, a V-shaped notch is formed at the end of the outer cylinder 2, and a thread retaining groove 3 is formed by cutting a slit orthogonally to the bobbin body from the bottom of the V-shaped notch. has been done.

A U-shaped notch 4 is formed at a position overlapping the thread stopper groove 3 with a projected area that surrounds the thread stopper groove 3 and is wider than the thread stopper groove 3.

In the case of the bobbin B having this structure, since the slit in which the thread stopper groove 3 is formed in the inner part is oriented in the axial direction of the bobbin B, there is no restriction in the direction of rotation, which is advantageous.

FIG. 9 shows the case where the outer cylinder 2 is torn, and the notch 4 is provided at the end of the base cylinder 1 so that it fits within the width of the projected area of the notch 4 provided at the end of the base cylinder 1. Since the thread stopper part 3 is cut into a slit shape at a position overlapping with the thread stopper part 4, the outer cylinder 2 can be easily removed from the thread stopper part 3.

In this case, the overlapping part of the top laminate formed in a spiral manner on the surface of the outer cylinder 2 is provided at a position slightly off from the top of the spiral starting from the slit, so that the top laminate is formed in a spiral manner on the surface of the outer cylinder 2. Accidents such as turning over can be prevented.

[Effect of idea]

The double bobbin of the present invention consists of a base cylinder and an outer cylinder that is fitted onto the surface of the base cylinder.A wide notch is opened at the end of the base cylinder, and the outer cylinder is Since the narrow thread stopper that clamps the thread end is opened from one end toward the other end within the projected area of the notch, the following effects can be achieved.
The thread stopper can be easily cut into a slit shape at the end of the thin outer cylinder. The notch formed at the end of the base cylinder requires less precision than the thread stopper, so it can be formed easily.

In addition, since it has a double structure, the base cylinder can be used multiple times and the outer cylinder can be replaced each time the yarn is wound, so it is possible to use a bobbin with accurately formed thread retaining grooves. can.

Furthermore, if you want to peel off the outer cylinder and reuse the base cylinder after using this double bobbin, fit the outer cylinder onto the surface of this base cylinder and remove the wide width formed on the base cylinder. The thread stopper can be punched out using a punching machine equipped with a mold shaped like the thread stopper so that it is located within the projected area of the notch.
The thread stopper can be easily formed using the cutout part that does not require a thread stopper function as a mark.

Furthermore, as mentioned above, this double bobbin allows a narrow thread stopper to be formed with a certain width within the range that overlaps the projected area of the wide notch. Even when an elastic material that is easily deformed by the winding pressure of the thread is used for the outer cylinder, the deformed thread stopper part does not come off from the notch part and does not lose its function as a thread stopper.

Further, a gap is provided between the base cylinder and the outer cylinder so that the base cylinder having the notch and the outer cylinder having the thread stopper can be integrated in a fitted state without slipping. Even if a rubber O-ring is interposed in this gap or a convex strip is formed on the base cylinder or the outer cylinder for mutual locking, the thread will not be securely held by the thread stopper of the outer cylinder. , there is no effect on the thread fastening function.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway front view of a bobbin according to the first embodiment, FIG. 2 is a side view of the same, and FIG. It is an enlarged perspective view of a part. FIG. 4 is an enlarged view of the end of the bobbin according to the second embodiment. FIG. 5 is an enlarged view of the main parts of the bobbin according to the third embodiment, and FIG.
The figure is a sectional view of the same side. Figures 7 and 8 are the 4th
FIG. 2 is a plan view and a front view of main parts of the embodiment. 9th
The figure is an explanatory diagram of the effect. Figures 10A, B, and C are main part sectional views showing the method of processing the end of the outer cylinder;
Figures A, B, and C are sectional views of essential parts showing fitting and fixing means between the base cylinder and the outer cylinder. B...Double bobbin, Y...Yread, y...End of thread, 1...Base cylinder, 2...Outer cylinder, 3...Thread stop part, 4...Notch part.

Claims (1)

[Scope of utility model registration request] It consists of a base cylinder and an outer cylinder fitted onto the surface of the base cylinder, with a wide notch opening at the end of the base cylinder, and a narrow width cutout in the outer cylinder for holding the yarn end. A double bobbin with a thread stopper facing from one end to the other end and opening within the projected area of the notch.