JPH0722775Y2 - Tape cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a tape cartridge in which a separate metal reinforcing plate is attached and fixed to the outer surface of a main body case.

[Conventional technology]

A conventional example of this type of tape cartridge will be described with reference to the accompanying drawings. The drive shaft insertion holes 3.3 are vertically penetrated to the left and right of the central portion of the upper and lower main surface walls 2 and 2 of the main body case 1 which is entirely plastic molded. The bosses 7, 7 are integrally projecting inward at the rim of the drive shaft insertion holes 3, 3 to form the main body case 1
The hubs 6 and 6 on which the tape 5 is wound are provided in the respective drive shaft insertion holes 3
It is publicly known that they are positioned on the bosses 3 and rotatably mounted around the bosses 7.

On the other hand, it is known, for example, from Japanese Utility Model Publication No. 63-38460 that a part of the main body case 1 is formed of a metal molded product to improve the shape accuracy and the position accuracy in a necessary portion of the main body case 1.
There, at least the portion including the boss 7 around the drive shaft insertion hole 3 in the main body case 1 is made of a metal molded product, and the other portion is made of a plastic material.

[Problems to be solved by the device]

The area around the drive shaft insertion hole 3 is a portion that allows smooth engagement of the drive shaft on the deck side and is in sliding contact with the hub 6 during rotation, so that dimensional (shape) accuracy is required primarily. It is also necessary to maintain the distance between the central axes of both drive shaft insertion holes 3 with high accuracy.

In this respect, the plastic molding of the entire main body case 1 including the drive shaft insertion hole 3 has a complicated cross-sectional shape due to the presence of the boss 7 and the like, so that the hub 6 made of plastic is prevented from being worn. It is also advantageous in terms of productivity and mass production.

However, in plastic molding, molding accuracy due to shrinkage during molding becomes a problem. The presence of the boss 7 causes a difference in wall thickness at the corresponding portion, so sink marks are likely to occur. Poor mechanical strength.
Even after the product is placed in a high temperature atmosphere, it is susceptible to thermal deformation,
There was a problem in such a place. If the main body case 1 is molded from various composite plastic materials or the like, the above problems can be solved to some extent, but this is not a costly solution.

However, as shown in the above-mentioned Japanese Utility Model Publication No. 63-38460, if the drive shaft insertion hole 3 and its surroundings are made of metal molded parts and the other plastic molded parts of the main body case 1 and the metal molded parts are integrated, the drive shaft The shape accuracy, heat resistance, mechanical strength, etc. around the insertion hole 3 can be arbitrarily improved.

However, it is difficult to mass-produce with high precision in the conventional type in which the whole of the periphery of the drive shaft insertion hole 3 including the boss 7, that is, the inner and outer thickness direction is made of a metal molded product.
Unless the metal material is very special, the hub side that comes in contact with the metal material is susceptible to wear, which causes a problem in durability. Since metal molded parts have a higher thermal conductivity than plastic materials, the internal tapes, hubs, etc. are more likely to be affected by heat when exposed to direct sunlight.

The present invention has been proposed in order to eliminate such a conventional problem.

An object of the present invention is to obtain a tape cartridge capable of ensuring a function of protecting a tape or hub against a heat source while improving the dimensional accuracy around the drive shaft insertion hole of the main body case.

Another object of the present invention is to obtain a tape cartridge which is excellent in mass productivity because the mechanical strength of a weak portion around the drive shaft insertion hole in the main surface wall of the main body case can be improved.

Still another object of the present invention is to obtain a tape cartridge capable of preventing abrasion of the hub and ensuring dimensional accuracy of the hub receiving portion.

[Means for Solving the Problems]

That is, since the plastic material shrinks during molding, it is difficult to ensure the dimensional accuracy around the drive shaft insertion hole 3 and the center distance between the drive shaft insertion holes 3 and 3, for example. In this respect, the dimensional accuracy of the metal material is easy to obtain at the time of molding, and the coefficient of thermal expansion of the metal material is generally smaller than that of the thermoplastic material, so that the dimensional accuracy in a high temperature atmosphere is stable. On the other hand, since the metal material has a good thermal conductivity, if the entire circumference of the drive shaft insertion hole 3 of the main body case 1 is made of a metal material in the thickness direction inside and outside, the hub 6 and the hub 6 will be immediately exposed to heat such as direct sunlight. Tape 5 is affected by heat.

Therefore, the present invention takes advantage of the plastic material and the metal material, and the wall portion around the drive shaft insertion hole 3 in the main surface wall 2 of the main body case 1 and the main body portion of the boss 7 are formed of the original plastic material. The outer side of the main surface wall 2 and the hole edge portion of the drive shaft insertion hole 3 are made of a metal material.

Specifically, in a known tape cartridge in which the main body case 1 is plastic-molded, both drive shaft insertion holes 3
3 has a metal reinforcing plate 13 fixed to the outer surface portion of the main surface wall 2 of the main body case 1 including 3, and the metal reinforcing plate 13 has a pair of left and right shaft insertion openings corresponding to the drive shaft insertion holes 3, 3. 15
・ 15 are respectively formed in a vertically penetrating shape, and an annular shaft guide portion 19 having a tapered inner guide surface 19a ・ 19a at the edge of the shaft insertion port 15 ・ 15 of the metal reinforcing plate 13 .19 is formed integrally with the shaft guide portion 19.
Is fitted in the hole edge portion of the drive shaft insertion hole 3 in a contact state.

Here, the metal reinforcing plate 13 is preferably obtained by pressing a metal plate material such as stainless steel or aluminum.
It also includes those formed such that the thickness is partially different, such as a metal molded product and a metal sintered body. That is, depending on the plastic material forming the main body case 1, stainless steel or a plated steel plate is used when the main purpose is to improve the mechanical strength, but an aluminum plate or a copper plate is used when the workability and dimensional accuracy are important. It is used to supplement the strength.

[Action]

The reason why the entire body case 1 is plastic-molded is to enable mass production without trouble even if the internal shape of the body case 1 is complicated. In particular, a boss 7 for positioning the hub 6 is provided at the hole edge of each drive shaft insertion hole 3 to attach the hub 6 to the main surface wall 2
The reason why the plastic molding is performed integrally with is to facilitate the molding and reduce the sliding contact resistance with the hub 6.

A separate metal reinforcing plate 13 is provided on the outer surface of the main surface wall 2 of the main body case 1.
Since the metal fixing plate 13 is insert-molded into the plastic material forming the main body case 1 so as to be embedded, warping deformation occurs due to the difference in coefficient of thermal expansion between the plastic material and the metal material. This is to prevent this. In this sense, it is useful to fix the metal reinforcing plate 13 to the main surface wall 2 with the adhesive material 21.

The metal reinforcing plate 13 is provided with a drive shaft insertion hole 3/3 on the main body case 1 side.
The shaft insertion ports 15 and 15 corresponding to the above are provided on the left and right in order to secure the distance between the center axes of both shaft insertion ports 15 and 15 with a certain accuracy, and one metal on one main surface wall 2. This is because it is sufficient to fix the reinforcing plate 13 to ensure the workability of assembling.

The shaft guide portion 19 provided at the edge of each shaft insertion port 15 literally functions as a guide when the drive shaft on the deck side is fitted into the drive shaft insertion hole 3 on the main body case 1 side. At the same time, since the shaft guide portion 19 is fitted in the hole edge of the drive shaft insertion hole 3 in a contact state, the shaft guide portion 19 of the boss 7 protruding inward at the hole edge portion of the drive shaft insertion hole 3 is formed. It functions as a splint to the root portion, and also functions to prevent the hub 6 from colliding with the boss 7 when the tape cartridge is dropped and the root portion of the boss 7 is cracked by an impact load.

[Effect of device]

According to the present invention, the main body case 1 including the main surface wall 2, the drive shaft insertion holes 3.3 and the bosses 7 is plastic-molded as usual. Therefore, even if the hub 6 has a complicated shape, it can be mass-produced at low cost, and the hub 6 also comes into sliding contact with the inner surface of the main surface wall 2 made of plastic and the boss 7, so that the hub 6 is not worn.

On the other hand, the main surface wall 2 including the left and right drive shaft insertion holes 3/3
A metal reinforcing plate 13 is fixed to the outer surface of the. Therefore, by selecting the material of the metal reinforcing plate 13, it is possible to satisfactorily reinforce the central portion of the main surface wall 2 where the drive shaft insertion holes 3, 3 are weak in terms of strength.

The metal reinforcing plate 13 is provided with shaft insertion ports 15 and 15 corresponding to the drive shaft insertion holes 3 and 3 on the left and right, and annular shaft guide portions 19 and 19 are integrally projected at the edges of the shaft insertion ports 15 and 15. It has a simple shape. Therefore, the shape and diameter of each shaft insertion port 15 including the shaft guide portion 19 can be formed with high accuracy, and the distance between the center axes of both insertion ports 15 can be set with high accuracy. Even when placed in a high temperature atmosphere, the coefficient of thermal expansion of the metal reinforcing plate 13 can be generally smaller than that on the side of the plastic main body case 1, so that the dimensional accuracy is stable. As a result, even if the precision after molding or thermal deformation after molding occurs in the periphery of the drive shaft insertion hole 3 including the boss 7 on the main body case 1 side and the distance between the central axes of both drive shaft insertion holes 3, 3. The metal reinforcing plate 13 supplements it. That is, since the rim (entrance portion) of each drive shaft insertion hole 3 is constituted by the shaft guide portion 19 of the metal reinforcing plate 13, the drive shaft on the deck side is guided by the tapered guide portion of the shaft guide portion 19. It is possible to reliably guide the insertion into the drive shaft insertion hole 3 via the surface 19a.

The metal reinforcing plate 13 does not undergo thermal deformation even in a high temperature atmosphere such as in a car and when it is exposed to direct sunlight. On the other hand, since the metal reinforcing plate 13 having a high thermal conductivity is present only on the outer surface of the plastic main surface wall 2, heat conduction from the metal reinforcing plate 13 can be suppressed by the main surface wall 2, and the hub 6 The tape 5 can be prevented from being directly affected by heat.

When the tape cartridge is dropped, the hub 6 is attached to the boss 7
However, since the shaft guide portion 19 on the side of the metal reinforcing plate 13 is attached to the base portion of the boss 7, the shaft guide portion 19 supports the base portion of the boss 7 and prevents the damage thereof. It will also happen.

[First Embodiment] FIGS. 1 to 7 show a Phillips type tape cartridge as a first embodiment of the present invention.

In FIGS. 1 and 7, reference numeral 1 is a main body case formed by screwing upper and lower plastic cases 1a and 1b together in a lid-matching manner.

To the left and right of the central part of the upper and lower main surface walls 2.2 of the body case
The drive shaft insertion holes 3, 3 are formed in a vertically penetrating manner, and the hubs 6, 6 on which the tape 5 is wound in the main body case 1 are positioned on the respective drive shaft insertion holes 3, 3 so that they can rotate freely. It is arranged.

On each main surface wall 2, annular short bosses 7 are integrally projectingly provided inwardly at the hole edges of the drive shaft insertion holes 3 3 respectively.
Fits on the outer periphery of the boss 7 and the amount of radial movement is restricted.

In the figure, the tape guide rollers 9 and 9 are arranged on the left and right of the front end in the main body case 1, and the tape guide block 10 molded separately in the front center portion of the main body case 1 is clamped and fixed between the upper and lower cases 1a and 1b. I am doing it. Thus, the tape 2 delivered from the one hub 6 is guided to the front surface of the case via the guide rollers 9 and then wound on the other hub 6.

In the main surface wall 2 of the main body case 1, the left and right drive shaft insertion holes 3,
A transparent window plate portion 11 for visually recognizing the tape winding amount is provided between the three. The transparent window plate portion 11 is integrally molded by a two-color molding method using a transparent plastic material when the upper and lower cases 1a and 1b are molded. That is, after the main body of the upper and lower cases 1a and 1b is primarily formed of an opaque plastic material, the transparent window plate portion 11 is secondarily formed of a transparent plastic material. At the center of the window plate portion 11, as shown in FIG.
Is projected upward.

In FIG. 1 and FIG. 6, 13 is a substantially central portion of each main surface wall 2 of the main body case 1, that is, the left and right drive shaft insertion holes 3.
It is a metal reinforcing plate that is fixed to the outer surface of the main surface wall 2 including 3 afterwards. The metal reinforcing plate 13 is made of an aluminum plate material, and is entirely press-formed into an elliptical shape in plan view.

On the left and right sides of the metal reinforcing plate 13, shaft insertion openings 15 and 15 corresponding to the respective drive shaft insertion holes 3 and 3 are provided in a vertically penetrating manner, and between the shaft insertion openings 15 and 15 the projections 12 are provided. A laterally long window hole 16 is formed by punching in a vertically penetrating manner.

In Fig. 6, the metal reinforcing plate 13 has a tape type 17a indicating the type and length, a manufacturer name indicating 17b, etc. on the outer surface to exert a label function, and the outer surface also displays a product number or lot number. Number display 17c
By engraving, the function as a nameplate is also demonstrated.

In FIGS. 3 and 4, each of the shaft insertion ports 15 of the metal reinforcing plate 13 has an inwardly directed shaft guide portion 19. The shaft guide portion 19 has a tapered inner guide surface 19a.

Specifically, when the shaft insertion port 15 is formed, the ring-shaped shaft guide portion 19 is formed in a tapered shape by burring. Next, as shown in FIG. 4, the inner surface of the shaft guide portion 19 is ground with a tool that rotates at a high speed of about 10,000 times per minute, and the shaft guide portion 19
Is formed on the guide surface 19a, and the surface accuracy of the guide surface 19a is ensured to give a metallic luster. Moreover, the outer surface of the metal reinforcing plate 13 and the guide surface 19a are connected via a sharp edge, and the shape and inner diameter of the upper end of the shaft guide portion 19 which is the insertion start end of the drive shaft on the deck side are strictly set. I am doing it. At the same time, the metal reinforcing plate 13 is provided with an apparent thickness through the shaft insertion port 15 so that the metal reinforcing plate 13 is felt to be thicker than it actually is, which causes a heavy feeling.

Here, briefly explaining the processing procedure of the metal reinforcing plate 13,
The indicators 17a and 17b are etched on the aluminum plate to color them, and then the outer shape and the holes are punched by pressing to obtain a blank reinforcing plate 13. Next, burring of the shaft insertion port 15 is performed, followed by grinding of the shaft guide portion 19,
After the alumite treatment was performed so as to give a golden color to the whole, an arbitrary small character or graphic display 17d was inserted by silk printing, and the number display 17c was further engraved.

On the outer surface of each main surface wall 2 of the main body case 1, as shown in FIG. 1, an elliptical recess 20 is formed which substantially coincides with the metal reinforcing plate 13 and is slightly larger than this, and is shown in FIG. As described above, the metal reinforcing plate 13 is attached and fixed to the recess 20 with the adhesive 21. In this pasted state, the outer surface of the metal reinforcing plate 13 is flush with the outer surface of the principal surface wall 2 or slightly sinks.

Thus, the shaft guide portion 19 of each shaft insertion port 15 is positioned so as to be fitted in contact with the rim portion (entrance portion) of each drive shaft insertion hole 3 as shown in FIG.

Further, as shown in FIG. 5, the projection 12 of the transparent window plate portion 11 is fitted into the window hole 16 of the metal reinforcing plate 13 to form a transparent window for visually observing the tape winding amount for each hub 7. The surface of the projection 12 is located on the same plane as the outer surface of the metal reinforcing plate 13. That is, the outer surface of the flat window plate portion 11 is connected to the metal reinforcing plate.
When it is simply covered with 13, a recess corresponding to the thickness of the window hole 16 is formed, dust easily enters the inside of the case, and it becomes difficult to see inside the case. Fixed the problem.

More specifically, the main surface wall 2 has a wall thickness of about 1.8 mm, the metal reinforcing plate 13 has a plate thickness of 0.4 mm, the left-right length thereof is about 62 mm, and the front-rear length is about 2 mm.
It was set to 7 mm. The depth of the recess 20 is set to 0.6 to 0.7 mm, and the surface of the metal reinforcing plate 13 is approximately about the surface of the main surface wall 2 in the fixed state.
It was set to sink inward by 0.1 mm.

According to such a tape cartridge, the upper and lower cases 1a and 1b
Even if there is molding strain on the shaft, the shape of each shaft insertion port 15 and the accuracy of the distance between the center axes of both insertion ports 15 and 15 can be improved by the metal reinforcing plate 13 that has been finished with high precision through press working and machining. Can be secured. Further, even when placed in a high temperature environment, the coefficient of thermal expansion of the metal reinforcing plate 13 is smaller than that of the main body case 1 made of styrene resin or the like, so that the shape and dimensional accuracy can be maintained similarly.

Even if the metal reinforcing plate 13 is heated by direct sunlight or the like, the plastic main surface wall 2 impedes heat conduction, so that the entire main surface wall 14 and the wall portion around the drive shaft insertion hole 3 including the boss 7 extend inward and outward. It was possible to prevent the internal hub 6 and the tape 5 from being directly affected by heat, as compared with the case where the entire surface is made of a metal material.

Since the metal reinforcing plate 13 is adhered to the case main surface wall 2 with the adhesive material 21, even if the thermal expansion coefficients of both 2 and 13 are different, slippage occurs through the adhesive material 21 and the metal reinforcing plate 13 The warp deformation due to heat does not occur in the portion of the main surface wall 2 to which this or this is attached.

[Second Embodiment] FIG. 8 shows a second embodiment of the tape cartridge according to the present invention, in which a wide recess 20 is formed over substantially the entire outer surface of the main surface wall 2 of the main body case 1. A metal reinforcing plate 13 was attached and fixed to the inner bottom surface of 20. Thus, the shapes of the recess 20 and the metal reinforcing plate 13 can be set arbitrarily.

[Third Embodiment] FIG. 9 shows a third embodiment of the tape cartridge according to the present invention, in which the metal reinforcing plate 13 is a die-cast molded product, and the shaft guide formed on the edge of the shaft insertion port 15 is shown. The portion 19 has a tapered guide surface 19a on its inner surface and a vertical surface 19b following the tapered guide surface 19a, and the length of the shaft guide portion 19 extends from the hole edge of the drive shaft insertion hole 3 to the outer peripheral surface of the boss 7. . Further, by caulking pins 23 projecting from a plurality of positions on the back surface of the metal reinforcing plate 13 and caulking and fixing the caulking pins 23 to the inwardly extending pin holes 24 provided in each principal surface wall 2, the principal surface wall 2 is metal-reinforced. The plate 13 was fixed vertically.

[Another embodiment]

10 (a), (b), and (c) show the metal reinforcing plate 13 respectively.
9 shows another different embodiment of the present invention.

In FIG. 10 (a), the metal reinforcing plate 13 is formed in a square shape, and the window hole 16 is formed in a drum shape.

The metal reinforcing plate 13 shown in FIG. 10 (b) has a spectacle-shaped outer shape. Thus, the shapes of the reinforcing plate 13 and the window holes 16 can be freely changed as needed.

In FIG. 10 (c), the metal reinforcing plate 13 is formed in a laterally long laterally U-shaped cross section in accordance with the cross sectional shapes of the upper and lower cases 1a and 1b.
In this way, the metal reinforcing plate 13 can also be shaped so as to cover the outer surfaces of the main surface walls 2 and the peripheral side walls of the upper and lower cases 1a and 1b.

The metal reinforcing plate 13 may be formed by another metal plate such as a stainless plate, a copper plate, a steel plate, or an electroforming method. The thickness of the metal reinforcing plate 13 can be arbitrarily set as long as it is equal to or less than the thickness of the principal surface wall 2, but is preferably 2/3 to 1/5 of the thickness of the principal surface wall 2.

In addition, the present invention may fix the metal reinforcing plate 13 only to the one main surface wall 2 of the upper and lower cases 1a and 1b. The tape guide block 10 in the figure is not molded separately, but the upper and lower cases 1a and 1b
It can be integrally formed on the side. The transparent window plate portion 11 provided on the main surface wall 2 can also be molded separately and fixed to the main surface wall 2 later by ultrasonic welding or the like.

[Brief description of drawings]

1 to 7 show a first embodiment of a tape cartridge according to the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a plan view, and FIG. 3 is AA in FIG. 4 is a sectional view taken along line B in FIG. 3, FIG. 5 is a sectional view taken along line CC in FIG. 2, FIG. 6 is a plan view of a metal reinforcing plate, and FIG. It is a top view. FIG. 8 is a perspective view showing a second embodiment of the tape cartridge according to the present invention. FIG. 9 is a vertical cross-sectional front view of essential parts showing a third embodiment of the tape cartridge according to the present invention. 10 (a), (b), and (c) show different embodiments of the present invention relating to a metal reinforcing plate, and FIGS. 10 (a) and (b) are plan views and FIG. 10 respectively. (C) is a vertical sectional front view of the whole. 1 …… Main body case, 1a …… Upper case, 1b …… Lower case,
2 ... Main surface wall, 3 ... Drive shaft insertion hole, 5 ... Tape, 6
…… Hub, 7 …… Boss, 11 …… Transparent window plate part, 12 …… Projection part, 13 …… Metal reinforcing plate, 15 …… Shaft insertion port, 16 …… Window hole,
19 …… Axis guide part, 19a …… Guide surface, 20 …… Concave part, 21 ……
Adhesive.

Claims (1)

[Scope of utility model registration request] 1. The main body case (1) is a plastic molded product, and the main surface wall (2) of the main body case (1) is provided with drive shaft insertion holes (3), (3) vertically on the left and right of the central portion. The bosses (7) and (7) are formed in a penetrating manner, and the bosses (7) and (7) are integrally projecting inward at the hole edges of the drive shaft insertion holes (3) and (3), and the tape is provided inside the main body case (1). The hubs (6) and (6) around which (5) is wound are positioned on the drive shaft insertion holes (3) and (3), respectively, and are mounted rotatably around the bosses (7) and (7), respectively. That is, the main body case (1) including both drive shaft insertion holes (3) and (3)
Having a metal reinforcing plate (13) fixed to the outer surface portion of the main surface wall (2) of the drive shaft inserting hole (3)
The pair of left and right shaft insertion openings (15) and (15) corresponding to (3) are formed in a vertically penetrating manner, and the shaft insertion openings (15) and (15) of the metal reinforcing plate (13) are formed. On the edge,
An annular shaft guide portion (19), (19) having a tapered inner guide surface (19a), (19a) is integrally formed so as to project from the shaft guide portion (19), (19). ) Is the drive shaft insertion hole (3)
A tape cartridge characterized in that the tape cartridge is fitted in the hole edge portion of (3) in a contact state.