JP5661312B2 - Winding core - Google Patents

Description

  The present invention relates to a core around which a film, paper, synthetic leather, leather, sheet or the like (hereinafter referred to as a sheet-like material) is wound.

  Conventionally, in a core around which a sheet-like material is wound, a step is generated between the winding start end of the sheet-like material and the sheet-like material wound thereon, and the number of times from the start of winding is affected by the step. There were problems such as step marks and wrinkles remaining on the wound sheet material, and the sheet material in the portion affected by the step marks and wrinkles could not be used as a product. Therefore, as a technique for preventing such problems, a step having a height substantially equal to the thickness of the sheet-like material is provided on the outer peripheral surface of the core, and at the same time, the blade is moved along the axial direction of the core. Such as providing a groove portion (see, for example, Patent Document 1), or providing a concave portion along the axial direction on the surface of the core, and embedding a soft resin having adhesiveness in the concave portion. Techniques (for example, see Patent Document 2) are known.

JP 2007-246192 A JP-A-2005-75521

However, in the case of a technique in which a step having a height substantially equal to the thickness of the sheet-like material is provided on the surface of the core as in Patent Document 1, the applicable core is determined by the thickness of the sheet-like material, and the thickness However, it is necessary to prepare a separate core for the sheet-like material having a different size. was there.
In addition, as in Patent Document 2, in a technique in which a concave portion is provided on the surface of the core and a soft resin is embedded in the concave portion, it takes time and cost to manufacture the core, and the disposal is performed. However, since it is necessary to separate and dispose of the core and the soft resin, there is also a problem that this lacks practicality.

  Therefore, the present invention can be applied as a core for eliminating a step mark even if the thickness of the sheet-like material is different, and can be manufactured easily and inexpensively, and it is possible to prevent troublesomeness even in the case of disposal or the like. With the goal.

  In order to achieve the above object, according to the present invention, in a cylindrical core around which a sheet-like material is wound, by forming a through groove that penetrates the inside and outside of the cylinder along the axial direction, It was made to be able to bend in the direction, and the winding start end of the sheet-like material was inserted into the through groove and wound up.

  And when winding the sheet-like material, if the winding start end of the sheet-like material is inserted into the through-groove and wound, the periphery of the through-groove will be affected by the tension at the time of winding or the tightening after winding. The part bends so as to fall inward, and the step difference between the first and second rounds is eliminated. At this time, the depression at the periphery of the through groove is gentle, and the amount of depression (the amount of deflection) at the periphery of the through groove is proportional to the thickness and weight of the sheets and the like, so it can be widely applied to sheet-like materials having different thicknesses. .

In general, sheet-like materials tend to be distorted (shrinking force) inside the sheet-like material due to the take-up tension at the time of winding. Sometimes the circumference of the winding core is reduced, the winding tension is absorbed, and a sheet-like material with less distortion (shrinking force) can be obtained. In addition, the core in which such a through groove is formed is easy to manufacture, and since it does not contain foreign materials, it can be easily disposed of.
In addition, as such a cylindrical winding core, what consists of a raw material which has flexibility, for example, a paper tube, a plastic tube, etc. is applicable.

In the present invention, the end surface on the winding direction side of the through groove is a tapered surface (inclined surface) .
In this way, the end surface on the winding direction side of the through groove is a tapered surface, and this inclined direction is made to coincide with the winding direction, so that when the sheet is wound, the contact surface between the sheet and the through groove end surface Can be made smoother, and a further effect of eliminating step marks can be obtained. At this time, the inclination angle of the tapered surface is preferably an inclination angle that is inclined by 1 ° to 60 ° from the radial direction.

In the present invention, the through groove is preferably formed by cutting a part of a cylindrical core.
Thus, by cutting and shaping a part of the cylindrical winding core, it becomes possible to improve the existing cylindrical shape and to manufacture it at low cost. Also, especially when the material of the core is a paper tube, it is difficult to generate cutting waste on the cutting surface by cutting with an ultrasonic cutter. There is no need to remove it.

In a cylindrical core around which a sheet-like material is wound, by forming a through groove that penetrates the inside and outside of the cylinder along the axial direction, if the periphery of the through groove is bent toward the inside of the cylinder, the winding tension and Due to the tightening or the like, the groove end surface corresponding to the portion overlapping the winding start end after the second round is bent so as to drop inward, and the step is eliminated. At this time, since the amount of sagging around the through groove bends in proportion to the thickness of the sheet material, it can be widely applied to sheet materials having different thicknesses, and the winding tension is absorbed during winding, A sheet-like material with little distortion is obtained.
Further, by making the end surface on the winding direction side of the through groove a tapered surface inclined in a predetermined direction, a further step mark elimination effect can be obtained, and when the winding core is a paper tube, the through groove is formed. By forming a part of the cylindrical winding core by cutting it with an ultrasonic cutter, it can be easily and inexpensively manufactured, and there is no problem that cutting waste is generated on the cut surface.

It is a general view which shows an example of the winding core which concerns on this invention. It is explanatory drawing which shows the state which wound the sheet-like material around this winding core. It is sectional drawing of this winding core. It is an effect | action figure of this core. It is explanatory drawing at the time of making the both end surfaces of the penetration groove | channel of a winding core taper. It is explanatory drawing explaining the conventional malfunction.

Embodiments of the present invention will be described with reference to the accompanying drawings.
The core according to the present invention can be applied as a core that eliminates step marks even if the thickness of the sheet-like material is different, and can be manufactured easily and inexpensively. A cylindrical winding core having a through-hole is formed so as to penetrate the inside and outside of the cylinder along the axial direction.

Here, first, a problem of a step mark generated in a conventional core will be described with reference to FIG.
When the sheet-like object 53 is wound around the cylindrical core 51, a step mark d is generated at a position where the sheet-like object 53 in the second and subsequent rounds overlaps with the winding start end of the sheet-like object 53. .

  This step mark d becomes conspicuous especially when the thickness of the sheet-like material 53 is large, and affects the number of turns at the start of winding. (Several laps) may have to be discarded.

Therefore, the present invention has been devised in order to prevent a problem caused by such a step mark d, and it is only necessary to make an extremely simple improvement to an existing winding core.
For this reason, as the cylindrical core according to the present invention, for example, a flexible material such as an existing paper tube or plastic tube is applicable, and the thickness of the material constituting the core is about 1 to 20 mm. It is suitable because it has flexibility.

  That is, as shown in FIG. 1, the main core 1 includes a through groove 2 that penetrates the inside and outside of the cylinder along the axial direction. The groove width (h in FIG. 3) of the through groove 2 The thickness is set to be equal to or greater than the thickness of the sheet 3 wound around the core 1. If the groove width is too wide, the strength of the core cannot be maintained. Therefore, the upper limit of the groove width h is set to 1/8 of the circumference of the core.

  Further, when the end surface on the winding direction side of the through groove 2 has an inclined structure (tapered surface), when the sheet-like material is wound, the sheet-like material and the groove end surface are brought into gentle contact with each other instead of a point. This is preferable because a further effect of eliminating step marks can be obtained. The inclination angle θ shown in FIG. 3 is preferably 1 ° to 60 °. If the angle is less than 1 °, the effect of smoothing the contact surface is difficult to be exhibited. If the angle exceeds 60 °, the thin portion of the groove end surface increases, so the strength of the groove end surface tends to be weakened. From the viewpoint of formability, it is preferable to provide through grooves so that both end faces are parallel as shown in FIG.

  Further, as shown in FIG. 5, when the inclinations of both end faces are made symmetrical (θ and θ ′), winding can be performed from either end face, so that the winding core can be easily installed in the winding device.

In this embodiment, when forming the through groove 2, the existing cylindrical paper tube is cut by an ultrasonic cutter that cuts the blade by applying tens of thousands to hundreds of thousands of minute vibrations per second. However, it is preferable to manufacture by removing a portion corresponding to the groove. By using an ultrasonic cutter, there is no need to regrind the cut surface by post-processing or the like without generating cutting waste on the cut surface, which is convenient.
Of course, even in the case of a plastic tube, it can be cut with an ultrasonic cutter. In the case of a plastic tube, it is possible to produce a core with a through groove from the beginning by using a mold or the like. Can be produced inexpensively and easily.

The point when winding the sheet-like material 3 in the above-described core 1 will be described with reference to FIG.
At the beginning of winding, the winding start end of the sheet-like material 3 is inserted into the through groove 2. At this time, when the groove end surface is a tapered surface t, the groove end surface is inclined in the winding direction.
Incidentally, in such a winding core 1, in a normal winding operation, an iron core or the like is inserted into the cylinder, and a winding procedure is performed while rotating the winding core 1 around the iron core. If the winding start end portion of the sheet-like material 3 inserted from the groove 2 is inserted into the gap between the iron core and the inner surface of the winding core 1, the winding operation is performed smoothly.

  When the sheet-like material 3 is wound around the core 1 in this state, the groove end surface of the portion where the sheet-like material 3 in the second and subsequent rounds begins to overlap is forced inward due to the winding tension and tightening. In response, it gently falls and the steps are eliminated. Further, when the taper surface t of the groove end surface is gently inclined with respect to the winding direction, the contact surface between the groove end surface and the sheet-like material is large, so that a further step mark elimination effect can be obtained.

  Moreover, since the amount of depression of the groove end surface is proportional to the thickness and weight of the sheet-like material 3, it can be used for various sheet-like materials 3 having different thicknesses by one winding core 1, and versatility increases.

Furthermore, generally when the sheet-like material 3 is wound with a winding core having no through-groove, a distortion to shrink inside the sheet-like material 3 occurs due to the winding tension of the sheet-like material 3. However, since the core 1 of the present invention has a through groove, the circumference of the core 1 is reduced by the winding tension, and the winding tension is dispersed. The strain can be relieved and, for example, a subsequent process such as annealing for removing the shrinkage (treatment for removing strain by applying heat) can be simplified.
Moreover, although the distortion of the outer sheet-like material can be improved by ordinary annealing, it was difficult to improve the distortion of the inner sheet-like material close to the core, but the sheet using the core of the present invention When the material is wound up, a sheet material with little shrinkage is obtained over the entire length from the beginning of winding.

  And such a core 1 can be produced cheaply and easily by a simple improvement such as cutting a part of an existing cylindrical core, and a different material or the like is not used. Therefore, disposal is easy.

In addition, this invention is not limited to the above embodiments. What has substantially the same configuration as the matters described in the claims of the present invention and exhibits the same operational effects belongs to the technical scope of the present invention.
For example, the material of the core 1 is an example.

<Example 1>
The formed vinyl chloride resin film having a thickness of 2 mm was wound using a paper tube having a diameter of 55 mm and a thickness of 3 mm having a through groove having a width of 1 cm and an end face taper of 45 ° in the winding direction. At this time, the beginning of winding of the vinyl chloride resin film was inserted into the through groove and wound up.
When the wound vinyl chloride resin film was unwound, no noticeable steps or wrinkles were seen, and it could be used over its entire length.

<Example 2>
The formed vinyl chloride resin film having a thickness of 2 mm was wound using a paper tube having a diameter of 55 cm and a thickness of 3 mm having a through groove having a width of 1 cm and an end face taper of 0 ° in the winding direction. At this time, the beginning of winding of the vinyl chloride resin film was inserted into the through groove and wound up.
When the wound vinyl chloride resin film was unwound, wrinkles occurred at the contact portion between the film at the beginning of winding and the through groove, but it could be used over almost the entire length.

<Comparative Example 1>
Using a paper tube having a diameter of 55 mm and a thickness of 3 mm without a through groove, the formed vinyl chloride resin film having a thickness of 2 mm was wound up.
When the wound vinyl chloride resin film was unwound, step marks due to the thickness at the beginning of winding were remarkably observed from the beginning of winding to 2 m, and could not be used as a product.

  In the core around which film, paper, synthetic leather, leather, sheet, etc. are wound, step marks and wrinkles due to the sheet thickness at the beginning of winding of the sheet can be eliminated, and the thickness of the sheet is different Is widely applicable, and can be easily and inexpensively configured, so that it is expected to be used in a wide range as a core around which various sheet-like materials are wound.

DESCRIPTION OF SYMBOLS 1 ... Core, 2 ... Through groove, 3 ... Sheet-like material, t ... Tapered surface, h ... Groove width.

Claims (2)

In the cylindrical core around which the sheet-like material is wound, by forming a through groove that penetrates the inside and outside of the cylinder along the axial direction, the periphery of the through groove can be bent in the inside and outside of the cylinder. The end surface on the winding direction side of the through groove is a tapered surface having an inclined structure, and the winding start end portion of the sheet-like material is inserted into the through groove to wind up, whereby the tension during winding or A winding core characterized in that the periphery of the through groove bends inward by tightening after winding. 2. The core according to claim 1, wherein the through groove is formed by cutting a part of a cylindrical core with an ultrasonic cutter.

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