JP2797686B2 - Recording media punching device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording medium punching apparatus.

[Prior Art] Conventionally, a punching device for punching and forming a recording medium, for example, a floppy disk base, has an upper die 41 and a lower die 42 provided opposite each other as shown in FIG. An outer diameter punch 44 is provided on the upper outer periphery of the cylindrical die holder 43, and an inner diameter die 45 is provided on the upper inner side.An outer diameter die 46 and an inner diameter punch 47 are provided below the upper die 41 via an annular space portion 48. , And the upper pad is inserted into the annular space 48 via a spring 49.
50 is provided movably in the vertical direction. Then, the raw material 51 is supplied between the upper die 41 and the lower die 42, and the upper die 41 is lowered and the floppy disk base is punched in a ring shape while the raw material 51 is pressed by the upper die pad 50. The upper mold pad 50 prevents the raw fabric 51 from being bent at the time of punching.

[Problems to be Solved by the Invention] In the above-described conventional technology, since the lower surface of the upper die pad 50 is entirely in contact with the web 51, the magnetic recording surface of the floppy disk base may be adversely affected. In addition, there is a problem that the floppy disk base is easily adhered to the upper die pad 50 after the punching is formed, which hinders the continuous operation of the punching device. In order to solve this problem, a contact portion is formed on the upper die pad corresponding to the recording invalid area on the inner and outer circumferences of the floppy disk base, and a recess is formed between the inner and outer contact portions. Although it is conceivable to form it, in such a case, particularly when punching a large floppy disk base, or when punching a plurality of floppy disk bases at the same time, a convex shape is formed on the floppy disk base in the recess of the upper die pad. There has been a problem that bending occurs and a product dimensional error occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording medium punching apparatus which can prevent a raw material from being bent at the time of punching and can punch and form a recording medium having high dimensional accuracy.

[Means for Solving the Problems] In order to achieve this object, a punching apparatus for a recording medium according to the present invention is provided on the lower surface of an upper mold pad in correspondence with a recording invalid area on the inner and outer peripheries of the recording medium. In addition to the provision of a ring portion, a projection is provided in a recess formed between the inner and outer ring portions to regulate the deflection of the material.

In the present invention, the protrusion is formed lower than the inner and outer ring portions.

In the present invention, the protrusion is formed to be lower outward.

[Operation] In the punching apparatus for a recording medium according to the present invention, at the time of punching, the original floppy disk base portion is placed between the lower surface of the outer ring portion and the upper surface of the lower die. The inside and outside recording invalid area portions are sandwiched, and the bending of the raw material in the recess at the lower part of the upper mold pad is suppressed by the projection.

EXAMPLES Examples of the present invention will be specifically described below with reference to the drawings.

(First Embodiment) Figs. 1 to 5 show a first embodiment of the present invention. As shown in Fig. 1, a lower die 1 of a punching device is interposed through a lower die receiving plate 2. It is mounted on the lower die mounting plate 3. An upper die 4, which is provided to be able to move up and down opposite to the lower die 1, is mounted on an upper die mounting plate 6 via an upper die receiving plate 5.

A die holder 7 is shrink-fitted in the lower die 1, and an outer diameter punch 8 is press-fitted on the upper outer periphery of the die holder 7 and an inner diameter die 9 is press-fitted on the upper inner side. The outer diameter punch 8 and the inner diameter die 9 are provided concentrically, and the upper surface of the die holder 7, the outer diameter punch 8 and the inner diameter die 9 constitutes a raw material mounting surface 10. A lifter 11 for an inner diameter pad is inserted into a through hole provided at the center of the die holder 7 via a ball retainer 12 so as to be movable up and down. An inner diameter pad 13 is attached to an upper portion of the lifter 11. The lifter 11 is urged upward by a spring 14, and the upper limit position is determined by a stopper 15 provided at the lower end. When the lifter 11 is at the upper limit position, the upper surface of the inner diameter 9 is flush with the upper surface.

A ring-shaped stripper 16 is provided around the outer diameter of the punch 8.
A plurality of lifters 17 are provided in the lower part of the stripper 16 in the circumferential direction, and these lifters 17 are arranged to penetrate the lower mold 1 in the vertical direction, and the lower ends of the A stopper 18 for determining the upper limit position of the upper limit is provided. The upper surface of the stripper 16 and the upper surface of the outer diameter punch 8 are flush with each other when the stripper 16 is urged upward by a spring 19 and the lifter 17 is at the upper limit position.

An outer diameter die 20 is shrink-fitted in the lower part of the upper die 4 and a cylindrical inner diameter punch 21 is provided inside. The outer diameter die 20 and the inner diameter punch 21 are provided concentrically. An annular space 22 is formed between them.

Between the upper die 4 and the lower die 1, a raw material supply path E into which the raw material D before punching the floppy disk base is fed is formed. The raw material D is obtained by forming a magnetic layer 24 on the front and back surfaces of a long base film 23 made of a soft plastic or the like, and is formed in a ring shape having a notch hole 25 at the center as shown in FIG. Is formed. The floppy disk base F has a magnetic recording surface 26 on the entire front and back surfaces, and the outer peripheral edge of the magnetic recording surface 26 and the peripheral edge of the notch hole 25 are not suitable for magnetic recording and reproduction. Invalid area 26A and inner recording invalid area 26B
The area between these recording invalid areas 26A and 26B is a recording effective area 26C used for magnetic recording and reproduction.

An annular upper pad 27 is disposed in the annular space 22 so as to be vertically movable. A plurality of lifters 28 are provided in the upper part of the upper pad 27 in the circumferential direction. The lifter 28 is vertically penetrated through the upper mold 4 and is urged downward by a spring 29 as an urging member. The lower limit position is determined by a stopper 30 provided at the upper end. I have. When the lifter 28 is at the lower limit position, the upper mold pad
The lower end surface of 27 is flush with the lower surfaces of the outer die 20 and the inner punch 21.

As shown in FIGS. 3 and 4, the upper mold pad 27 is provided with an outer ring portion 31 and an inner ring portion 32 on the outer periphery and the inner periphery of the lower surface, and a recess 33 is formed between the two ring portions 31, 32. The lower surfaces of the outer ring portion 31 and the inner ring portion 32 are
Of the outer peripheral recording invalid area 26A and the inner peripheral recording invalid area 26B.

Further, in the recess 33 of the upper mold pad 27, a cylindrical projection 34 for restricting deflection from the lower surface of the upper mold pad 27 above the recess 33 is concentric with the inner and outer ring portions 31, 32 at substantially the center positions. A plurality of projections are provided at equal intervals on the upper side, and the lower surface of this projection 34 is
2 is formed slightly lower than the lower surface.

 Next, the operation of the punching device having the above configuration will be described.

The raw material D is intermittently fed into the raw material supply path E between the upper die 4 and the lower die 1 by a feeder (not shown), and the upper die 4 is lowered at the time when the feed is stopped. With the lowering of the upper mold 4, the upper mold pad 27 lowers in a unified manner, and the mounting surface 10 on the lower mold 1 side.
While the deflection of the upper web D is restricted by the projections 34 of the upper pad 27, the lower surfaces of the two ring portions 31 and 32 abut against the upper surfaces of the web D corresponding to both the recording invalid areas 26A and 26B of the floppy disk base F. And, the inner diameter punch 21 and the outer diameter die 20 of the upper die 4 abut on the flat upper surface of the raw material D. When the inner punch 21 and the outer die 20 descend in this state, the upper pad 27 resists the force of the spring 29 while suppressing the convex deflection of the raw material D by the convex portion 34 of the upper pad 27. Upper mold 4
, The inner diameter pad 13 and the stripper 16 are similarly lowered, and cutting is performed between the outer diameter punch 8 and the outer diameter die 20 and between the inner diameter punch 21 and the inner diameter die 9, and the floppy disk is cut. The disk base F is formed by stamping.

Then, as the upper die 4 is lifted after the punching, the stripper 16 and the inner diameter pad 13 move upward by the bias of the springs 19 and 14, and the upper die 27 moves downward with respect to the upper die 4 by the bias of the spring 29. Relative movement, first after punching
As shown in the figure, the original state is restored, and the floppy disk base F is paid out together with the raw material D.

As described above, in the above-described embodiment, the ring portion 3 which comes into contact with the recording invalid areas 26A and 26B of the floppy disk base F
1 and 32 are provided on the upper mold pad 27, and the projections 34 are provided in the recesses 33 between the ring portions 31 and 32 and regulate the deflection of the raw material D. , The lower surface of both ring portions 31 and 32 of the upper mold pad 27, the outer diameter punch 8 and the inner diameter die 9
The raw material D is pinched and punched between the upper surface of the raw material D and the bending of the raw material D generated in the concave portion 33 is uniformly suppressed by the protrusion 34. This makes it possible to punch the floppy disk base F into an accurate predetermined shape, and
It is possible to eliminate a product dimensional error that tends to occur when punching a large floppy disk base or a plurality of floppy disk bases that are likely to bend in the material D on the substrate 10 at the same time.

(Second Embodiment) FIGS. 6 and 7 show a second embodiment of the present invention, in which the same portions as those in the first embodiment are denoted by the same reference numerals, and the description of the same portions will be omitted. In this example, the protrusion 34A for restricting deflection is formed in a cylindrical shape smaller than the protrusion 34 of the first embodiment, and this protrusion 34A is located between the two rings 31 and 32 in the recess 33 of the upper pad 27. A plurality of rows are radially arranged at equal intervals, and the lower surface of the protrusion 34A is formed so as to be inclined downward from the inner ring portion 32 to the outer ring portion 31. In the lower part of the outer ring portion 31, a plurality of groove-shaped air vent grooves 35 are formed to link the outside of the upper die pad 27 and the recess 33.

Also in this embodiment, the deflection of the raw material D is caused by the protrusion 34A.
As a result, the material D is retained at the time of punching by the pressing of the two ring portions 31 and 32, and the same effect as in the first embodiment can be obtained. Furthermore, since the lower surface of the protrusion 34A for bending control is provided so as to be inclined downward from the inner ring portion 32 side toward the outer ring portion 31 side, the bending of the raw material D is The material is regulated from the inside to the outside, and the blank D can be punched in a state where the raw material D is uniformly stretched outward from the cutout hole 25 in the portion of the floppy disk base F. In addition, the outer ring portion 31 of the upper mold pad 27
The provision of the air vent groove 35 in the lower portion prevents the floppy disk base F from sticking to and sticking to the upper mold pad 27 after punching.

(Third Embodiment) FIGS. 8 and 9 show a third embodiment of the present invention.
The same parts as those of the embodiment are denoted by the same reference numerals, and the description of the same parts is omitted. In this example, the protrusion 34B for flexure control is formed in a columnar shape and the lower end thereof is formed in a spherical shape, and the protrusion 34B is provided at equal intervals on two inner and outer concentric cores in the recess 33 of the upper pad 27. A plurality of them are formed alternately, and the lower end of the projection 34B is formed slightly lower than the lower surfaces of the ring portions 31 and 32. In addition, air vent grooves 35 are provided in the lower portions of both ring portions 31 and 32, respectively. Also in this embodiment, the deflection of the web D is restricted by the projection 34B and the two ring portions 31, 32
By pressing, the material D is retained at the time of punching, and the same effect as in the first embodiment can be obtained.

(Fourth Embodiment) FIGS. 10 and 11 show a fourth embodiment of the present invention.
The same parts as those of the embodiment are denoted by the same reference numerals, and the description of the same parts is omitted. In this example, the protrusion 34C for regulating deflection is connected to the inner ring portion 2
The projection 34C
Are arranged in a plurality of rows radially at equal intervals in the recesses 33 of the upper mold pad 27, and the lower ends of the projections 34C are formed so as to be inclined downward from the inner ring portion 32 side toward the outer ring 31 side. . An air vent groove 35 is provided below the inner ring portion 32. Also in this embodiment, the bending of the raw material D is restricted by the protrusion 34C for restricting the bending, and the raw material D is retained at the time of punching by the pressing of the two ring portions 31, 32.
An effect similar to that of the embodiment is obtained.

(Modification) The present invention is not limited to the above-described embodiment.
Various modifications can be made within the scope of the present invention. For example, the protrusions 34, 3 for controlling deflection shown in the above-described embodiment.
The lower surfaces of 4A, 34B, 34C may be formed flush with the lower surfaces of both ring portions 31, 32. In addition, the size, dimensions and the number and arrangement of the protrusions for regulating the deflection can be appropriately selected.

[Effect of the Invention] The present invention provides inner and outer ring portions on the lower surface of the upper die pad corresponding to the recording invalid areas on the inner and outer circumferences of the recording medium, and a concave formed between these inner and outer ring portions. Since the projections for regulating the deflection of the raw material are provided in the place, the bending of the raw material at the time of punching can be prevented, and a recording medium with high dimensional accuracy can be formed by punching.

Further, in the present invention, since the protruding portion is formed lower than the inner and outer ring portions, it is possible to prevent bending of the raw material at the time of punching, and to punch and form a recording medium having high dimensional accuracy.

Further, according to the present invention, since the protrusion is formed to be lower toward the outside, it is possible to prevent bending of the raw material at the time of punching, and to punch and form a recording medium having high dimensional accuracy.

[Brief description of the drawings]

1 to 5 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a punching device, FIG. 2 is a sectional view of the punching device after punching a floppy disk base, and FIG. Is a bottom view of the upper mold pad, FIG. 4 is a sectional view of the same, FIG. 5 is a plan view of the floppy disk base, and FIG. 6 and FIG.
FIG. 6 is a bottom view of the upper mold pad, FIG. 7 is a sectional view of the same, FIG. 8 and FIG. 9 show a third embodiment of the present invention, and FIG. Bottom view, FIG. 9 is the same sectional view,
10 and 11 show a fourth embodiment of the present invention, FIG. 10 is a bottom view of the upper mold pad, FIG. 11 is a cross-sectional view of the upper mold pad,
FIG. 12 is a sectional view of a main part of a punching device showing a conventional example. 1 Lower mold 4 Upper mold 26A Outer record invalid area 26B Inner record invalid area 27 Upper pad 29 Spring (biasing member) 31 Outer ring part 32 Inner Ring part 33 ... recesses 34, 34A, 34B, 34C ... projections F ... floppy disk base (recording medium) D ... raw material E ... raw material supply path

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 5/84 B26F 1/02

Claims (3)

(57) [Claims] An upper die and a lower die are provided at upper and lower positions of a raw material supply path to which a raw material is supplied, and an upper die pad is provided on the upper die via an urging member so as to be movable up and down. In a punching apparatus for a recording medium in which the upper mold pad is brought into contact with a raw material at the time of punch forming, an inner and outer ring is formed on a lower surface of the upper mold pad corresponding to a recording invalid area on the inner and outer circumferences of the recording medium. And a projection for restricting the deflection of the raw material is provided in a recess formed between the inner and outer ring portions. 2. An apparatus according to claim 1, wherein said protrusion is formed lower than said inner and outer ring portions. 3. The recording medium punching device according to claim 1, wherein said projection is formed to be lower outward.