JPH0661875U - Film winding core - Google Patents

Abstract

(57) [Abstract] [Purpose] When manufacturing a magnetic recording medium, there is no possibility that shavings from both ends of the core will adhere to the base film or the magnetic material coated surface, or shavings will be generated from both ends of the core. (EN) Provided is a film winding core in which there is no risk of producing a magnetic recording medium having a scratch on the surface thereof, and there is no risk of error during reproduction of the magnetic recording medium. A base film of a magnetic recording medium is wound around an outer peripheral surface of a core body having a cylindrical shape, and the inner peripheral surfaces of both ends of the core body are used as a pair of mechanical devices for winding or unwinding the base film. In the film winding core that is used by being sandwiched by the tip tapered portions of the respective shafts, corresponding to both side edges of the base film, between the outer peripheral surface position of the core body and both ends of the core body, It is characterized in that a shielding collar is provided over the circumference.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a film winding core, and more particularly, to a film winding core in which there is no possibility that shavings of the core body will adhere to a winding base film when a magnetic recording medium is manufactured.

[0002]

[Prior art]

 A tape-shaped magnetic recording medium has a magnetic layer coated on a base film, and such a magnetic recording medium is generally manufactured as follows. First, the base film is prepared by winding it around a film winding core, and the core is applied to a magnetic material coating machine. In the coating machine, the base film is unrolled from the core, the surface is coated with the magnetic material, and then wound on another core. The base film coated with the magnetic material is left at a constant temperature to stabilize the magnetic layer, and then calendered to obtain a magnetic recording medium.

Conventionally, the film winding core used as described above has a cylindrical shape, and the material thereof is left at a constant temperature in a state where the core is wound with a base film coated with a magnetic material. Therefore, it is necessary that the base film can withstand the tightness of winding and the temperature expansion is small. Therefore, FRP is usually used for the core.

[0004]

[Problems to be solved by the device]

 However, when the core is mounted on the applicator, as shown in FIG. 6, the inner peripheral surface sides of both ends of the core body 1 are sandwiched by the tip tapered portions 31, 31 of the pair of shafts 3, 3 facing each other. The angled inner peripheral edge portions 11, 11 are pressed against the tip taper portions 31, 31 each time they are clamped. Therefore, the inner peripheral edge portion 11 may be gradually shaved, and the scraped powder may be attached to the base film 2. Further, the magnetic material may be applied to the base film 2 to which the scraped powder is attached. . Then, as shown in FIG. 7, when the film 6 coated with the magnetic material in the state in which the above-mentioned shavings are adhered is calendered, the shavings 7 adhere to the calender roll 8 and the subsequent film (magnetic The surface of the recording medium 6 may be scratched one after another, which may cause an error during reproduction of the magnetic recording medium.

Therefore, it is an object of the present invention to eliminate the possibility that the shavings on both ends of the core adhere to the base film or the magnetic material application surface during the manufacture of the magnetic recording medium, or the shavings from both ends of the core. To provide a film winding core in which there is no possibility that a magnetic recording medium having a scratch on the surface is produced, and there is no possibility that an error occurs during reproduction of the magnetic recording medium. is there.

[0006]

[Means for Solving the Problems]

 According to the present invention, a base film of a magnetic recording medium is wound around the outer peripheral surface of a core body having a cylindrical shape, and the inner peripheral surface side of both ends of the core body is used as a mechanical device for winding or unwinding the base film. In the film winding core that is used by being sandwiched by the tip taper portions of each of the pair of shafts, it is provided between the outer peripheral surface position of the core body and both ends of the core body, which correspond to both side edges of the base film. The above object is achieved by providing a film winding core (hereinafter referred to as the first invention), which is provided with a shielding flange over the entire circumference.

Further, according to the present invention, the base film of the magnetic recording medium is wound on the outer peripheral surface of the core body having a cylindrical shape, and the inner periphery of both ends of the core body is wound for winding or unwinding the base film. In the film winding core that is used by sandwiching the surface side with the taper of the tip of each of the pair of shafts of the mechanical device, the inner peripheral edge portions of both ends of the core body are each covered with a coating made of a material that is not easily scraped. The above object is achieved by providing a film winding core (hereinafter referred to as a second device) characterized by being attached.

[0008]

According to the film winding core of the first invention, when the magnetic recording medium is manufactured, the shavings generated from the both ends of the core body sandwiched by the pair of shafts of the mechanical device generate the core body. The shielding flanges provided over the entire circumference between the outer peripheral surface position of the core body and both ends of the core body, which correspond to both side edges of the base film wound around Scattering to the base film is prevented, and there is no risk of adhesion to the base film.

According to the film winding core of the second invention, the inner peripheral edge portions at both ends of the core body sandwiched by the pair of shafts of the mechanical device are respectively manufactured during the production of the magnetic recording medium. There is no risk of shavings from the inner peripheral edge of the core body because it is coated with a material that is difficult to shave, and there is no risk of shavings of the core body adhering to the base film. .

[0010]

【Example】

 An embodiment of the film winding core of the first invention will be described below with reference to the drawings. 1 is a perspective view showing an embodiment (first embodiment) of a film winding core of the first invention together with a base film wound around the core, and FIG. 2 is a film winding core shown in FIG. FIG.

In the film winding core of the first embodiment, as shown in FIG. 1, a base film 2 of a magnetic recording medium is wound around an outer peripheral surface of a core body 1 having a cylindrical shape. When the core is mounted on a magnetic material coating machine to form a magnetic layer on the base film 2, as shown in FIG. 2, a mechanical device (in the coating machine The pair of shafts 3, 3 approaching from both sides of the core body 1 provided on the feeding device and the winding device are pressed against each other, and the tip taper parts 31, 31 facing each other are pressed against each other, and The base film 2 is unwound and wound while being sandwiched between the shafts 3 and 3, and a magnetic material is applied to the surface of the base film 2 between the unwound and winding.

Thus, as shown in FIG. 2, the film winding core of the first embodiment has the outer peripheral surface position of the core body and the core body corresponding to both side edges 21 and 21 of the base film 2. Shield collars 4 and 4 are provided around the entire circumference between the both ends.

The film winding core of the first embodiment will be further described. As shown in FIGS. 1 and 2, the shielding collar 4 is in the shape of a disc having a constant radial width. The width of the shielding flange 4 in the radial direction is preferably not less than the film winding diameter, and the thickness is preferably 1 to 20 mm. The shielding collar 4 is preferably formed integrally with the core body 1, but a hollow disc having an inner diameter equal to the outer diameter is fitted on the outer peripheral surface of the core body 1. The two may be joined together, and when a hollow disc is used, it is preferable to use the same material.

The width of the shielding flange 4 in the radial direction may not be constant in the circumferential direction, and the thickness may not be constant. In addition, a plurality of the shielding flanges 4 may be provided on one end side.

In the film winding core of the first embodiment configured as described above, when the magnetic recording medium is manufactured, the core body 1 of the core body 1 held by the pair of shafts 3 of the mechanical device is sandwiched. The shavings generated from both ends are prevented from scattering toward the base film 2 side by the shielding collars 4 and 4, and there is no possibility of adhering to the base film 2.

Therefore, according to the film winding core of the first embodiment, there is no fear that the magnetic material is applied onto the base film 2 to which the above-mentioned shavings are adhered, and therefore the surface due to the above-mentioned shavings is applied. There is no possibility that a scratched magnetic recording medium will be produced, and there is no possibility that an error will occur during reproduction of the magnetic recording medium.

Next, an embodiment of the film winding core of the second invention will be described with reference to the drawings. 3 and 4 show an embodiment (second embodiment) of the film winding core of the second invention. FIG. 3 is a perspective view corresponding to FIG. 1 of the first embodiment, and FIG. FIG. 4 is a cross-sectional view showing one end of the film winding core shown in FIG. 3.

In the film winding core of the second embodiment, as shown in FIG. 3, the base film 2 of the magnetic recording medium is wound around the outer peripheral surface of the core body 1 having a cylindrical shape. When the core is applied to a magnetic material coating machine to form a magnetic layer on the base film 2, a mechanical device (a feeding device in the coating machine and A pair of shafts (not shown) approaching from both sides of the core body 1 provided on the winding device are pressed against each other, and the core body 1 is clamped by the pair of shafts. The base film 2 is unrolled and wound up in a curved shape, and the magnetic material is applied onto the base film 2 between the unrolling and winding.

Thus, as shown in FIG. 4, the film winding core of the second embodiment has a coating body 5 made of a material which is hard to be scraped on each of the inner peripheral edge portions 11, 11 at both ends of the core body 1. 5 is attached.

The film winding core of the second embodiment will be further described. As shown in FIGS. 3 and 4, the covering body 5 is formed by processing a SUS plate into an annular body having an L-shaped cross section. Therefore, the inner diameters of the coatings 5 and 5 are aligned with the diameters of the inner peripheral surface of the core body 1 in the step portions 12 and 12 formed on the inner peripheral surface sides of both ends of the core body 1, respectively. So it's being worn.

The thickness of the covering 5 is preferably 2 to 10 mm, and the outer diameter of the covering 5 at the end surface of the core body 1 is A + (5 to 20) with respect to the dimension A shown in FIG. mm), and the length in the central axis direction (depth direction) of the core body 1 is preferably 10 to 50 mm.

The inner diameter of the cover 5 does not have to be equal to the diameter of the inner peripheral surface of the core body 1, and the cover 5 is formed by processing and molding a metal other than SUS. It is also possible to use the following materials, high rigidity, and high heat resistant polymers. Further, the covering 5 may have a shape that is partially cut off in the circumferential direction, or may be formed of three or more arc-shaped portions.

In the film winding core of the second embodiment configured as described above, the inner peripheral edge portions 11 and 11 at both ends of the core body 1 are respectively manufactured at the time of manufacturing the magnetic recording medium. Since the coatings 5 and 5 made of a material that is not easily scraped are adhered, there is no fear that shavings will be generated from the inner peripheral edge portions 11 and 11 of the core body 1 sandwiched by the pair of shafts of the mechanical device. There is no possibility that the shavings of the core body 1 will adhere to the base film 2.

Therefore, according to the film winding core of the second embodiment, there is no fear that the magnetic material is applied onto the base film 2 to which the shavings are attached, so that the surface is not scratched by the shavings. There is no possibility of producing a magnetic recording medium with the magnetic recording medium attached, and there is no possibility of error during reproduction of the magnetic recording medium.

FIG. 5 is a view corresponding to FIG. 4, showing another embodiment (third embodiment) of the second invention. In the film winding core of the third embodiment, the covering 5'is formed by molding a metal plate so that the outer diameter of the end surface of the core body 1 of the covering 5 in the second embodiment is expanded. is there. Also in the film winding core of the third embodiment, the same effect as that of the second embodiment is obtained.

Further, as another embodiment, it is possible to use the first device and the second device in combination. The object of the present invention can be achieved more effectively by using the first device and the second device in combination.

It should be noted that the present invention is not limited to the above-described embodiment, but the entire circumference is shielded between the outer peripheral surface positions corresponding to both side edges of the base film and both ends of the core body. A collar may be provided, or a cover made of a material that is not easily scraped may be applied to each of the corners on the inner peripheral surface side at both ends of the core body.

[0028]

[Effect of device]

 The film winding core of the present invention has no possibility that the shavings on both ends of the core adhere to the base film or the magnetic material coated surface during the manufacture of the magnetic recording medium, or shavings are generated from both ends of the core. Therefore, there is no possibility of producing a magnetic recording medium having a scratch on the surface thereof, and there is no possibility of causing an error when reproducing the magnetic recording medium.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment (first embodiment) of a film winding core of the first invention together with a base film wound around the core.

FIG. 2 is a cross-sectional view of the film winding core shown in FIG.

FIG. 3 is a view corresponding to FIG. 1 of an embodiment (second embodiment) of the film winding core of the second invention.

FIG. 4 is a cross-sectional view showing one end of the film winding core shown in FIG.

FIG. 5 is a view corresponding to FIG. 4, showing another embodiment of the second invention.

FIG. 6 is a view corresponding to FIG. 2 showing a state in which a conventional film winding core is sandwiched between a pair of shafts of a mechanical device.

FIG. 7 is a perspective view showing how a film coated with a magnetic material is unwound from a conventional film winding core and hung on a calendar.

[Explanation of symbols]

 1 Core Main Body 11 Inner Peripheral Edge 2 Base Film 21 Side Edge 3 Shaft 31 Tip Tapered Part 4 Shield Tsuba 5 Cover

Claims (2)

[Scope of utility model registration request] 1. A base film of a magnetic recording medium is wound on an outer peripheral surface of a core body having a cylindrical shape, and the inner peripheral surface side of both ends of the core body is machined for winding or unwinding the base film. In the film winding core that is used by being sandwiched by the tip taper portions of the pair of shafts, respectively, between the outer peripheral surface position of the core body and both ends of the core body, which correspond to both side edges of the base film. ,
A film winding core characterized in that a shielding flange is provided over the entire circumference. 2. A base film of a magnetic recording medium is wound around an outer peripheral surface of a core body having a cylindrical shape, and the inner peripheral surface side of both ends of the core body is machined for winding or unwinding the base film. In the film winding core that is used by being sandwiched by the tip taper portions of each of the pair of shafts, the inner peripheral edge portions at both ends of the core body are coated with a coating made of a material that is not easily shaved. Film winding core.