JPH1045335A - Core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a slit by forming plural grooves in the longitudinal direction on a side surface of a round bar or a polygonal column-shaped bar. SOLUTION: Plural grooves 6 are formed in the longitudinal direction on a side surface 5 of a round bar or a polygonal column-shaped bar. A length of the grooves 6 is set to a distance corresponding to a width of a winding material from the tip. A shape of the grooves 6 is formed in an angle at which the winding material can be wound in the rotational direction of a core, that is, in the shape of forming a hitching part 7. It is important that an angle 8 formed by the hitching part 7 and the side surface 5 is set not more than 90 deg.. The number of grooves 6 is not particularly limited, and can be properly increased and decreased by a diameter of the core and a width of the winding material. By a kind of winding material, the core becomes effective when a gradient of 1/100 to 1/1000 is arranged in the direction of the tip 8. In this way, a slit can be eliminated by devising a shape of a side surface of a bar shape of the core.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core for winding a sheet material.

[0002]

2. Description of the Related Art Conventionally, when a sheet-like material is wound into a cylindrical or elliptical cylindrical shape, as shown in FIG. The winding has been performed by using a wound core and sandwiching the material 3 in the slit portion by the method shown in FIG. However,
This method has the following problems, and is currently being standardized without being solved.

[0003] 1) As shown in FIG. 3, a “L” -shaped material 4 remains in the central hole of the wound element, which hinders the product processing in a later process, and the work process becomes difficult. To increase.

[0004] 2) When the take-up element is pulled out from the core, the material may be in close contact with the circumference of the core, so that contact or frictional resistance may make it impossible to pull out the element. The shape of the winding end face collapses, which lowers the product yield.

[0005] 3) Since there is a slit at the center of the core, as the core diameter becomes smaller and the core length becomes longer, the core strength decreases and the core is damaged. ,
Winding is disturbed, which causes a reduction in quality accuracy of the winding element.

[0006] 4) When the element wound into a cylindrical shape or an elliptical cylindrical shape is pressed into a flat shape, it is necessary to take measures such as taking into account the direction with respect to the material in the shape of the "" in the center hole. It is.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a winding core which can replace the slit type having such a problem.

[0008]

Means for Solving the Problems The inventor of the present application has made intensive studies to achieve this object, and as a result, has found that the slit can be eliminated by devising the shape of the rod-shaped side surface of the core. Based on the above, further on-site experimental research was repeated to arrive at the present invention.

The core of the present invention is a core formed by forming a plurality of grooves 6 in the longitudinal direction on the side surface 5 of a round bar or a polygonal column-shaped bar, and the length of the groove 6 is taken up from the tip. A distance equivalent to the width of the material is sufficient. As shown in FIG. 4, the shape of the groove 6 is such that the winding material can be wound with respect to the rotation direction of the winding core, that is, the shape in which the hooked portion 7 is formed.

As a result of an experiment at the site, in the sectional view, the shape of the groove 6 is preferably as shown in FIG.
It has been found that it is important that the angle θ between the hooked portion 7 and the side surface 1 is 90 ° or less. The number of the grooves 6 is not particularly limited, and can be appropriately increased or decreased depending on the diameter of the winding core and the width of the winding material. Further, depending on the type of the winding material, the winding core is 1/100 to 1/1000 in the direction of the front end 8.
This is effective when a gradient is provided.

[0011]

According to the winding core of the present invention, since the material 4 in the shape of the letter "L" does not remain in the center hole of the wound element, the product can be easily processed in the subsequent process. The contact or frictional resistance at the time of extraction from the core is small, and the extraction can be performed smoothly. Further, since the core of the present invention has no slit, even a small-diameter and long core has three times or more the strength of a conventional core. Furthermore, when the element wound into a cylindrical shape or an elliptical cylindrical shape is pressed into a flat shape, there is no "L" shaped material left in the center hole, so there is no restriction such as considering the direction of crushing. .

[0012] The winding core of the present invention has a simpler machine structure than the conventional half bidirectional extraction method. In a conventional slit-type core, the core is tensioned by the material.
The outer diameter of the core changes to cause a tightening phenomenon, thereby deteriorating the accuracy and the removability of the winding element. However, such a problem does not occur at all in the core of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a conventional core.

FIG. 2 is a schematic explanatory view of use of a conventional core.

FIG. 3 is a schematic view of a conventional element wound around a core.

FIG. 4 is a schematic explanatory view of a core according to the present invention.

FIG. 5 is a schematic explanatory view of use of the core of the present invention.

FIG. 6 is a schematic view of an element wound around a core according to the present invention.

FIG. 7 is a sectional view illustrating a specific example of a core according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical or elliptical cylindrical round bar 2 Slit 3 Winding material 4 "Letter" material 5 Side surface of round bar or polygonal column bar 6 Groove 7 Hooked portion 8 Tip

Claims (3)

[Claims] 1. A winding core having a plurality of grooves 6 formed in a longitudinal direction on a side surface 5 of a round or polygonal rod. 2. The winding core according to claim 1, wherein said groove has a shape which forms a hooking portion in the direction of rotation. 3. The core according to claim 1, wherein the cross section of the groove has a shape as shown in FIG.