JP2004262221A - Mold for molding and method for manufacturing tape cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for molding wherein an insert part is surely set so as not to generate a positional dislocation and a method for manufacturing a tape cartridge using the mold. <P>SOLUTION: This mold is provided with a fixed-side mold 91 with the first face 94 constituting a cavity, a movable-side mold with the second face constituting the cavity together with the first face, a holding member 95 comprising magnets embedded in at least either the fixed-side mold or the movable-side mold so as to hold an insert part 34 comprising a magnetic material in the cavity. The holding member surely holds the insert part, preventing the positional dislocation of the insert part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a molding die for injection molding and a method for manufacturing a tape cartridge using the molding die.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when insert molding an insert component using a resin material or the like with a molding die, the insert component is set in the molding die before molding. When the insert component was a magnetic material, the mold surface was magnetized to fix the insert component. However, with such a fixing method, the insert component may not be fixed to the mold surface in some cases, which may cause a shift of the insert component and lower the yield of the insert molded product.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems of the prior art, and has been made using a molding die capable of securely fixing and setting an insert part in a molding die so as not to cause a positional shift, and using the molding die. It is an object of the present invention to provide a method for manufacturing a tape cartridge.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a molding die according to the present invention includes a stationary die having a first surface forming a cavity, and a movable die having a second surface forming the cavity together with the first surface. A side mold; and a holding member made of a magnet embedded in at least one of the fixed mold and the movable mold so as to hold an insert part made of a magnetic material in the cavity.
[0005]
According to this molding die, the insert component can be securely fixed and set by the holding member made of the magnet in the cavity of the molding die, and the displacement of the insert component can be prevented. Therefore, it is possible to obtain a molded product in which the insert part is at an accurate position.
[0006]
In this case, the holding member can be attached so as to be inserted into a hole formed on the opposite side of the first surface or the second surface in the fixed mold or the movable mold. . In this case, the hole may penetrate the first surface or the second surface on which the holding member is provided, or may be a bottomed hole. Further, the holding member may be attached so as to be inserted into a hole formed in the first surface or the second surface. Further, it is preferable that a support member for supporting the holding member inserted into the hole formed on the opposite side of the first surface or the second surface be provided inside the mold, so that the holding member is prevented from coming off. it can.
[0007]
Preferably, an embedding member is provided between the tip of the holding member and the first surface or the second surface. As described above, it is preferable that the tip of the holding member is not exposed to the first surface or the second surface.
[0008]
Preferably, the first surface or the second surface in which the holding member is embedded is coated. In addition, by providing a plurality of the holding members, the insert component can be favorably held.
[0009]
Further, the above-described molding die includes, for example, a tape reel having a magnetic plate on an engagement surface which is wound around a tape-shaped recording medium and rotatably housed in a tape cartridge and is engaged with a driving member on a driving device side. It can be a molding die for molding. Thereby, the insert component can be securely attached as a magnetic plate to the engagement surface of the tape reel without displacement.
[0010]
In the method for manufacturing a tape cartridge according to the present invention, by using the above-described molding die, an engaging surface which is wound around a tape-shaped recording medium and is rotatably housed in the tape cartridge and engages with a driving member on a driving device side. A tape reel having a magnetic plate.
[0011]
According to the tape cartridge manufacturing method, the tape cartridge can be manufactured by securely attaching the insert component as the magnetic plate to the engaging surface of the tape reel without displacement.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a tape cartridge having a tape reel that can be formed by a molding die according to the present embodiment. FIG. 2 is a longitudinal sectional view showing a state in which the tape reel is locked by the tape cartridge of FIG. 3 is a longitudinal sectional view showing a state where the tape reel is unlocked. FIG. 1 also shows a perspective view of the upper case 1 and the hub portion 32 as viewed from the back side.
[0013]
The tape cartridge shown in FIG. 1 is composed of an upper case 1 and a lower case 2 to form a rectangular flat one-reel type, and is a magnetic recording tape as a tape-shaped recording medium (hereinafter sometimes simply referred to as “tape”). The tape reel 3 is wound inside, and is configured to be rotatable when mounted on a recording / reproducing apparatus. The upper case 1 and the lower case 2 can each be manufactured by molding from a resin material.
[0014]
The tape reel 3 includes an upper flange 31, a lower flange 33, and a hub 32 formed integrally with the lower flange 33 and wound around a tape-shaped magnetic recording medium on a peripheral surface thereof. Also, as shown in FIG. 1, a circular metal plate 34 made of a soft magnetic material is integrally provided on the lower surface 32a side of the hub portion 32. Around the metal plate 34, engaging teeth 34a that engage with the teeth of the driving member 85 (FIG. 3) on the recording / reproducing apparatus side are provided in three parts in the circumferential direction. A plurality of holes 34b are formed between the opposite surfaces of the lower surface 32a. The metal plate 34, the engagement teeth 34a, and the plurality of holes 34b are exposed to the outside through the through holes 21 of the lower case 2.
[0015]
On the inner side of the hub 32 and on the opposite side of the lower surface 32a, there are a plurality of circumferentially arranged teeth 35 in which a number of teeth are arranged in a circle so as to mesh with and engage with the teeth 51 of the brake lock member 5. Is provided separately. The teeth 35 can be manufactured by molding from a resin material such as polycarbonate (PC). In this case, the strength may be increased by mixing glass fibers.
[0016]
As shown in FIGS. 1 and 2, the brake lock member 5 is disposed inside the hub portion 32, and the tooth portion 51 in which a number of teeth are arranged in a circle so as to mesh with and engage with the tooth portion 35 of the hub portion 32. And a cross-shaped engaging hole 5a formed in a cylindrical end surface having a smaller diameter than the tooth portion 51, an end portion 5b around the cross-shaped hole 5a, and an end of the brake lock spring 4 on the back side of the tooth portion 51. A ring-shaped groove 5c formed so as to receive the portion 4b. The brake lock member 5 can be manufactured by molding from a resin material such as POM (polyoxymethylene).
[0017]
As shown in FIGS. 1 and 2, the brake lock member 5 has a plurality of engaging projections 1c provided upright on the inner surface 1a of the upper case 1 in its cross-shaped hole 5a. It is movably engaged and attached to the upper case 1. The tip 4a of the brake lock spring 4 fits into the ring-shaped groove 1b of the inner surface 1a of the upper case 1, and the ring-shaped groove 1b of the upper case 1 and the ring-shaped groove 5c of the brake lock member 5 are connected. 2, the brake lock member 5 is constantly urged in the direction B in FIG. 2, and the teeth 51 and the teeth 35 of the hub 32 are engaged with each other to prevent the rotation of the tape reel 3 and to prevent the brake. State.
[0018]
The brake release member 6 is disposed between the hub portion 32 and the brake lock member 5, and includes a main plate 6a and a plurality of legs 6b protruding downward in the drawing from a plurality of locations around the main plate 6a. The plurality of legs 6b are inserted into the plurality of holes 34b on the lower surface of the hub portion 32, and when the tape cartridge is mounted on the recording / reproducing apparatus, the legs 6b of the brake release member 6 are pushed from below in the figure to move upward. To be lifted. As a result, as shown in FIG. 3, the brake lock member 5 is lifted upward against the urging force of the brake lock spring 4 by the central convex bearing portion 52 via the backing plate 61 of the brake release member 6 so that the end is lifted. The portion 5b moves to the unlocked position so as to approach the inner surface 1a.
[0019]
Further, the leading end 83 (shown by a broken line in FIG. 1) of the magnetic recording tape wound on the tape reel 3 is fixed to the leader member 8. In the leader member 8, the leading end 83 of the magnetic recording tape is wound around the pin member 81, and the C-shaped clamp 82 is fitted over the pin member 81 and fixed. When the tape cartridge is mounted on the recording / reproducing apparatus, the leader member 8 is held by the holding member on the apparatus side, and is pulled out from the tape draw-out port 73 (FIG. 1) to the apparatus side.
[0020]
Further, the tape outlet 73 is opened and closed by the door member 7, and the door member 7 is constantly urged by the spring member 10 in a direction to close the tape outlet 73. The opening member (not shown) is opened against the urging force of the spring member 10.
[0021]
When the tape cartridge shown in FIGS. 1 to 3 is not used during storage or the like, the brake lock member 5 is urged by the brake lock spring 4 to move to the lock position as shown in FIG. When the teeth 54 of the tape reel 3 engage with the teeth of the teeth 35 of the hub 32 of the tape reel 3, the tape reel 3 is in a brake state and cannot be rotated. Tape loosening can be prevented.
[0022]
Next, when the tape cartridge is mounted on the recording / reproducing apparatus, as shown in FIG. 3, the driving member 85 on the apparatus side and the tape cartridge relatively approach each other, and the driving member 85 moves through the through hole 21 of the lower case 2. As described above, when magnetically attracted to the metal plate 34 of the soft magnetic material on the lower surface 32 a side of the hub 32, the teeth of the driving member 85 engage with the engaging teeth 34 a of the hub 32. Then, the brake release member 6 is moved in the direction B ′ (the direction opposite to the direction B) in FIG. 2 by the leg portion 6 b by the projection of the tooth portion of the drive member 85, so that the brake lock member 5 It moves by a fixed stroke against the force and reaches the unlocked position as shown in FIG. 3, a gap is formed between the teeth 51 and the teeth 35, and the meshing between them is released. As a result, the rotation of the drive shaft 86 of the drive member 85 allows the tape reel 3 to rotate. Further, the door member 7 is opened by an opening member (not shown) on the apparatus side, the leader member 8 is held by the holding member on the apparatus side, and the magnetic recording tape is pulled out to the apparatus side. Reproduction becomes possible.
[0023]
Next, a molding die according to the present embodiment will be described with reference to FIGS. FIG. 4A is a longitudinal sectional view of the center of the fixed mold of the molding die according to the present embodiment, FIG. 4B is a plan view of the center of the fixed mold, and FIG. FIG. 5 is an enlarged partial longitudinal sectional view showing a holding member provided at a center portion of the fixed mold, and FIG. 5 is a sectional view of a molding mold in which the fixed mold and the movable mold shown in FIG. 4 are separated. FIG. 6 is a cross-sectional view of a molding die in a state where the fixed-side die and the movable-side die of FIG. 4 are assembled so as to be moldable.
[0024]
The molding die shown in FIGS. 4 to 6 is for molding the tape reel 3 (excluding the upper flange 31) of the tape cartridge shown in FIGS.
[0025]
As shown in FIG. 5, the molding die 110 includes a fixed die 91 having a cavity surface 94 and a movable die 92 having a cavity surface 97, and the cavity surface 94 and the cavity surface 97 extend in the vertical direction. Thus, the fixed mold 91 is fixed to the mounting surface (not shown) of the molding machine, and the movable mold 92 is movably mounted to the mounting surface (not shown) of the molding machine.
[0026]
As shown in FIG. 6, when the fixed mold 91 and the movable mold 92 are assembled by moving the movable mold 92 and joining them together on the PL surface (matching surface), the fixed mold 91 is removed. A cavity 89 is formed from the cavity surface 94 and the cavity surface 97 of the movable mold 92, and the cavity 89 has a shape corresponding to the shape of the tape reel 3 (excluding the upper flange 31) of FIG. .
[0027]
As shown in FIGS. 4 (a) and 4 (b), the central portion 90 of the fixed mold 91 is formed with the engaging teeth 34a of the lower flange portion 33 of the tape reel 3 of FIG. This is for insert-molding the metal plate 34 on the inner periphery of the engagement tooth 34a.
[0028]
The central portion 90 of the fixed mold 91 has a circular shape on the cavity surface 94 in which the metal plate 34 as an insert part is fitted into the central convex portion 94a from the central hole 34c. A flat surface 94b, a cylindrical member 99 having a surface 111 for forming the engaging teeth 34a (FIG. 1) and arranged so that the surface 111 is located around the flat surface 94b, and a spool 93a serving as a passage for the molten resin. And a middle member 93 formed to penetrate the center and fit into the central portion 90.
[0029]
Each hole 34b (see FIGS. 1 and 2) between the engaging teeth 34a is formed by a protrusion (not shown) on the movable mold 92 side provided so as to divide the surface 111 of the cylindrical member 99 into three parts. ) Is formed.
[0030]
As shown in FIG. 4A, the central portion 90 further includes a plurality of holding members 95 made of permanent magnets for holding the metal plate 34 by magnetic force when performing insert molding. As shown in FIG. 4C, the holding member 95 is formed in a columnar shape as a whole, and has a large-diameter pedestal portion 95b and a relatively small-diameter thin portion 95c. A mold inner surface 90a into which the middle member 93 is fitted is formed on the opposite side to the flat surface 94b, but the holding member 95 has a small-diameter portion 95c in a through hole formed through the mold inner surface 90a and the flat surface 94b. Inserted from.
[0031]
As shown in FIG. 4C, when the holding member 95 is inserted from the small diameter portion 95c into the through hole of the mold inner surface 90a, the pedestal portion 95b contacts the shoulder in the hole, and the small diameter portion 95c The distal end portion 95a does not reach the flat surface 94b of the cavity surface 94 and is not exposed. An embedding material 96 made of a metal material (for example, a steel material) or the like is embedded in the columnar cavity formed between the distal end portion 95a and the flat surface 94b.
[0032]
As shown in FIG. 4B, the plurality of holding members 95 are concentrically arranged at equal angular intervals and are embedded in the plane 94b. Since the flat surface 94b is coated by plating or the like, there is no adverse effect due to the provision of the holding member 95. In addition, as a permanent magnet constituting the holding member 95, an Sm-Co (samarium-cobalt) magnet or a Nd-Fe-B (neodymium-iron-boron) magnet can be used, but is not limited thereto. Absent.
[0033]
Next, preparation and molding of insert molding by the molding die 110 will be described. That is, as shown in FIG. 5, the fixed mold 91 and the movable mold 92 are separated from each other, and the metal plate 34 is placed on the plane 94b of the central portion 90 of the fixed mold 91 as shown by the broken line in FIG. The metal plate 34 made of a soft magnetic material is securely held and fixed to the flat surface 94b by the magnetic force of the plurality of holding members 95 when the metal plate 34 is positioned and fitted in the center hole 34c in the center hole 34c. Therefore, the displacement of the metal plate 34 of the insert component set in the fixed mold 91 is less likely to occur. In addition, the metal plate 34 is set on the flat surface 94b of the fixed mold 91 so that its plane faces the vertical direction. However, no displacement occurs due to the weight of the metal plate 34. The setting of the metal plate 34 on the fixed mold 91 can be automatically performed by an automatic assembling apparatus.
[0034]
Then, as shown in FIG. 6, after the fixed mold 91 and the movable mold 92 are assembled and in a moldable state, the molten resin is passed from the nozzle 109 provided in the fixed mold 91 through the spool 93 a of the middle member 93. Injection molding is performed by injecting into the cavity 89 from the gate portion 93b. By this injection molding, the tape reel 3 (except for the upper flange 31) of FIG. 1 can be manufactured. As described above, the engaging teeth 34a are formed in a circular band shape, and the metal plate 34 is integrated into the concave portion inside the circular band-shaped engaging teeth 34a. As a molding material for the tape reel 3 (excluding the upper flange 31) in FIG. 1, a reinforcing material (glass fiber, carbon fiber, or metal powder) is mixed with a resin such as polycarbonate, polyamide, polybutylene terephthalate, or polyphenylene sulfide. However, the present invention is not limited to this.
[0035]
When performing the insert molding as described above, the metal plate 34 of the insert component is securely fixed by the plurality of holding members 95 as described above, and the metal plate 34 is unlikely to be displaced. Therefore, the tape reel 3 (excluding the upper flange 31) of FIG. 1 in which the metal plate 34 is insert-molded at an accurate position can be obtained, and the yield of the tape reel 3 (excluding the upper flange 31) by molding is improved. I do.
[0036]
As described above, the present invention has been described with the embodiments, but the present invention is not limited to these, and various modifications can be made within the technical idea of the present invention. For example, a molding die according to the present invention is used for molding a tape reel having a metal plate (magnetic plate) on an engagement surface which is housed in a tape cartridge and engages with a driving member of a driving device (recording / reproducing device). It is needless to say that the present invention can be applied to a molding die for another molded product having an insert part, without being limited to the mold.
[0037]
Further, in FIGS. 4 to 6, the holding member is provided on the fixed mold, but it is needless to say that the holding member may be provided on the movable mold as needed. May be provided in both. Further, in FIGS. 4 to 6, the holding members are provided at three places, but it is needless to say that four or more places or two or less places may be provided.
[0038]
Further, the shape of the holding member may be cylindrical, and the holding member may be attached from the cavity surface side. That is, as shown in the vertical cross-sectional view of FIG. 7, the holding member 116 is formed in a cylindrical shape from a magnet, and is attached by inserting the holding member 116 into a hole formed at a predetermined position on the plane surface 94b of the cavity surface 94. Is also good. In this case, the end surface 116a of the holding member 116 may be exposed to the flat surface 94b, but the flat surface 94b is preferably subjected to a coating process such as plating. In addition, it is a matter of course that an embedding material 96 may be embedded between the end surface 116a of the holding member 116 and the flat surface 94b as shown in FIG. Although the hole into which the holding member 116 is inserted is a bottomed hole in FIG. 7, the hole may penetrate the mold inner surface 90a.
[0039]
Further, in FIG. 4A, a through hole is formed in the mold inner surface 90a for inserting the holding member. However, as shown in a modification shown in FIG. 8, a bottomed hole is formed from the mold inner surface 90a toward the flat surface 94b. May be formed, the holding member 116 may be inserted from the mold inner surface 90a, and the tip end 116a may be close to the flat surface 94b.
[0040]
Further, as shown in FIG. 9, the holding member 95 is supported by interposing the intermediate member 112 between a portion where the pedestal portion 95b of the holding member 95 is exposed on the inner surface 90a of the mold and the shoulder surface 93c of the middle member 93. However, it is possible to prevent the holding member 95 from coming off to the shoulder surface 93c side. The intermediate member 112 is preferably made of, for example, a heat-resistant material such as polyimide. When the plurality of holding members 95 are concentrically arranged as shown in FIG. 4B, the plurality of holding members 95 are supported. It is preferable to form the ring as described above.
[0041]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the molding die of this invention, an insert component can be reliably fixed and set so that a displacement may not arise in a molding die. Further, according to the method of manufacturing a tape cartridge using the molding die, the tape cartridge can be manufactured by securely attaching the insert component as a magnetic plate to the engagement surface of the tape reel without displacement.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a tape cartridge according to an embodiment.
FIG. 2 is a longitudinal sectional view of the tape cartridge of FIG. 1 in a state where the tape reel is locked at a lock position.
3 is a longitudinal sectional view of the tape cartridge of FIG. 1 in a state where the tape reel is unlocked at an unlocked position.
4 (a) is a longitudinal sectional view of the center of the fixed mold of the molding die according to the present embodiment, FIG. 4 (b) is a plan view of the center of the fixed mold, FIG. (C) is a partial longitudinal sectional view showing, on an enlarged scale, a holding member provided at the center of the fixed mold.
FIG. 5 is a cross-sectional view of the molding die in which the fixed die and the movable die of FIG. 4 are separated on the mounting surface of the molding machine.
6 is a cross-sectional view of the molding die in a state where the fixed die and the movable die of FIG. 4 are assembled so as to be molded on a mounting surface of the molding machine.
FIG. 7 is a view showing a modified example of the holding member according to the present embodiment, and is a longitudinal sectional view of a central portion of a fixed mold similar to FIG. 4 (a).
FIG. 8 is a view showing another modification of the holding member according to the present embodiment, and is an enlarged fragmentary longitudinal sectional view of the holding member provided at the center of the fixed mold.
FIG. 9 is a view showing still another modified example of the holding member according to the present embodiment, and is an enlarged longitudinal sectional view of a main part showing the vicinity of the holding member at the center of the fixed mold.
[Explanation of symbols]
1 upper case 2 lower case 3 tape reel 34 metal plate (insert part)
34a Engaging teeth 110 Molding die 89 Cavity 90 Center part of fixed die 90a Mold inner surface 91 Fixed die 92 Movable die 94 Cavity surface of fixed die (first surface)
94b Cavity surface plane 97 Cavity surface of movable mold (second surface)
95, 116 Holding members 95a, 116a Tip surface 96 of holding member Embedding material 112 Intermediate member (support member)

Claims (10)

A fixed mold having a first surface forming a cavity;
A movable mold having a second surface that defines the cavity together with the first surface;
And a holding member made of a magnet embedded in at least one of the fixed mold and the movable mold so as to hold an insert part made of a magnetic material in the cavity. 2. The holding member according to claim 1, wherein the holding member is inserted into a hole formed on an opposite side of the first surface or the second surface in the fixed mold or the movable mold. 3. The molding die described. The molding die according to claim 1, wherein the holding member is inserted into a hole formed in the first surface or the second surface. The molding die according to claim 1, wherein an embedding member is provided between a tip of the holding member and the first surface or the second surface. The molding die according to any one of claims 1 to 4, wherein a tip of the holding member is not exposed on the first surface or the second surface. The molding die according to any one of claims 1 to 5, wherein the first surface or the second surface in which the holding member is embedded is coated. The molding die according to any one of claims 1 to 6, wherein a plurality of the holding members are provided. 3. The mold according to claim 2, wherein a support member for supporting a holding member inserted into a hole formed on the opposite side of the first surface or the second surface is provided inside the mold. Molding mold. 9. A tape reel according to claim 1, wherein the tape-shaped recording medium is wound around the tape cartridge, and is rotatably housed in a tape cartridge. Or a molding die according to claim 1. By using the molding die according to any one of claims 1 to 9, a tape-shaped recording medium is wound around the tape-shaped recording medium, rotatably housed in a tape cartridge, and engaged with a driving member on a driving device side. A method for manufacturing a tape cartridge, comprising forming a tape reel having a magnetic plate on a mating surface.

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