JPH04214280A - Tape cartridge - Google Patents

Abstract

PURPOSE:To reduce a cost and to improve productivity by integrally insert- molding a metallic pin for mounting a tape reel and roller with a base plate of the tape cassette at the time of molding this base plate of a synthetic resin. CONSTITUTION:A flange 31 is horizontally and integrally molded near the bottom end of the pin 22 among the plural metallic pins at the time of the insert molding of the pin 22. Further, the lowermost of a circular conical tapered surface 32 is molded. The pin 22 is perpendicularly inserted into an insertion hole 36 and the flange 31 is fitted into a flange fitting hole 37. While a tapered surface 32 is held fitted to a bearing hole 38, metallic molds 34, 35 are combined and the molten synthetic resin is injected into a cavity 33. The flange 31 is made horizontal by the hole 37 at this time and further, the surface 32 determines the central position P of the pin 22. The perpendicularity and centering are executed with high accuracy in this way.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cartridge most suitable for use as a data cartridge for high-density recording of CPU data, and particularly relates to a base plate made of synthetic resin.

0002

[Prior Art] As a data cartridge for recording CPU data at high density, for example,
No. Publication is known.

In this type of data cartridge, as shown in FIG. 9, the cartridge 1 has a thin box-shaped upper cover 3, which is the upper half, which is screwed onto a base plate 2, which is an aluminum plate, which is the lower half. is formed by. Moreover, the cover 3 has a horizontal top wall 3a, a vertical front wall 3b, a rear wall 3c, and left and right side walls 3d, which are integrally molded from a transparent synthetic resin. A pair of left and right tape reels 4 are rotatably supported on the base plate 2, and magnetic tape 5, which is a tape, is attached to both reels 4.
is wound. The magnetic tape 5 is guided by a pair of left and right tape guides 6 attached to the base plate 2, and is stretched along the rear side of the front wall 3b. Further, a belt drive roller 7 and a pair of left and right belt guide rollers 8 are rotatably supported on the base plate 2 at approximately the center on the front side and at approximately both right and left ends on the rear side. An elastic belt 9 is wound around the belt drive roller 7 and both belt guide rollers 8 with strong tension in a substantially T-shape. A portion of this belt 9 is in pressure contact with the outer periphery of a pair of tape winding portions 5a of the magnetic tape 5 wound around both tape reels 4.

Next, when this data cartridge is installed in the recording/reproducing apparatus, the base plate 2 and the upper cover 3 are opened and closed in such a way as to open and close the notch 10 formed at one end of the front side of the base plate 2 and the upper cover 3. The opening/closing door 11 rotatably attached between the covers 3 is opened in the direction of the arrow a as shown by the dashed dotted line, and the magnetic head 12 on the recording/reproducing device side is inserted into the notch 10 and the magnetic tape 5 is inserted. Contact. At the same time, the drive roller 13 on the side of the recording/reproducing device is inserted into the opening 14 provided in the upper cover 3, and a large diameter roller portion is integrally formed on the upper part of the belt winding surface 7a of the belt drive roller 7. 7
It is crimped onto the outer periphery of b. Then, when the belt drive roller 7 is rotationally driven in the direction of arrow b by the drive roller 13, and the belt 9 is rotationally driven in the direction of arrow c,
Both tape reels 4 are rotationally driven in the direction of arrow d by this belt 9 via both tape winding portions 5a, and the magnetic tape 5 is run in the direction of arrow e at a relatively high speed of 25 to 120 inches/sec. The head 12 performs recording and reproduction on the magnetic tape 5.

Conventionally, as shown in FIG. 10, a plurality of metal pins 15 made of stainless steel or the like are press-fitted onto an aluminum base plate 2 to rotatably support a pair of tape reels 4 and three rollers 7, 8. A pair of tape reels 4 and three rollers 7 and 8 made of synthetic resin were inserted into the outer periphery of each metal pin through the center hole 16 and supported rotatably.

That is, conventionally, as shown in FIG. 11(A), first, an original aluminum plate 17 is pressed and a base plate 2 is punched out. Next, the base plate 2 is leveled using a leveler. Next, as shown in FIG. 11(B), a plurality of metal pins 15 are vertically inserted into the planting mold 18. next,
As shown in FIG. 11(C), a plurality of metal pins 15 are driven into the base plate 2 from above with a plurality of punches 19 while being guided by a planting die 18. The metal pin 15 was press-fitted into the base plate 2 by punching out a portion 2a of the metal pin 2a downward.

[0007]

[Problem to be solved by the invention] However, as in the past,
The structure in which a plurality of metal pins 15 are press-fitted into the base plate 2 made of an aluminum plate is extremely troublesome to process.
Since advanced technology is required, there is a problem in that production costs are extremely high.

Furthermore, when a plurality of metal pins 15 are press-fitted into the base plate 2, the metal pins are likely to fall or the axis position may be misaligned, and the perpendicularity of the metal pins 15 to the base plate 2 or the center from the reference may easily occur. There was a problem in that it was difficult to perform positioning (centering) with high precision.

Furthermore, when the metal pin 15 is driven into the base plate 2 while being guided by the raised mold 18, the metal pin 15 is easily damaged, and the tape reel 4 or roller that is inserted and attached to the outer periphery of the metal pin 15 is easily damaged. There was a problem that the rotation performance of 7, 8, etc. deteriorated.

[0010]Also, the material cost of aluminum plates is high, and
The cartridge 1 using the aluminum base plate 2 is heavy and has problems in handling.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tape cartridge in which the base plate is made of synthetic resin and the accuracy of mounting metal pins is improved.

0012

Means for Solving the Problems In order to achieve the above object, claim 1 of the tape cartridge of the present invention is that the base plate is molded from synthetic resin, and at that time, a plurality of metal pins are attached to the base plate. The tape reel and roller are rotatably supported by these metal pins, which are integrally insert-molded.

[0013] According to a second aspect of the present invention, flanges are integrally provided near the lower ends of the plurality of metal pins, and the perpendicularity of the metal pins is controlled by these flanges, and the metal pins are integrally insert-molded on the base plate. .

[0014] According to a third aspect of the present invention, tapered surfaces are formed at the lower ends of the plurality of metal pins, and the center positions of the metal pins are regulated by these tapered surfaces, and the metal pins are insert-molded integrally with the base plate.

[0015]

[Function] Claim 1 of the tape cartridge configured as described above is that when the base plate is molded from synthetic resin, a plurality of metal pins are integrally insert-molded into the base plate, so that the synthetic resin of the base plate is molded. It is possible to aim for

[0016] According to a second aspect of the present invention, when a plurality of metal pins are integrally insert-molded into a base plate molded from a synthetic resin, the perpendicularity of the metal pins can be achieved with high precision by the flanges of the metal pins.

[0017] According to a third aspect of the present invention, when a plurality of metal pins are integrally insert-molded into a base plate molded from a synthetic resin, the tapered surface of the metal pins is used to locate the center position of the metal pins from a reference (center ring). ) can be performed with high precision.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a data cartridge to which the present invention is applied will be described below with reference to FIGS. 1 to 8. Note that the same reference numerals are given to the same structural parts as in the conventional example shown in FIGS. 9 to 11, and redundant explanation will be omitted.

First, FIGS. 4 to 8 show how the base plate 21 is made of synthetic resin.

That is, the base plate 21 is injection molded from a synthetic resin such as polypropylene or polyacetal containing a reinforcing material such as glass fiber.
On the top, there are a pair of metal pins 22 that rotatably support a pair of tape reels 4, a stepped metal pin 23 that constitutes a pair of tape guides 6, a belt drive roller 7, and a pair of belt guide rollers 8. A total of 3 rotatably supported
One metal pin 24, a support shaft 25 that rotatably supports the opening/closing door 11, a plurality of metal pins 26 constituting a tape guide pin, and the like are vertically insert-molded integrally.

A pair of tape reels 4, three rollers 7, 8, and an opening/closing door 11 are inserted into the outer periphery of each of the metal pins 22, 24, and 25 through their center holes 16, and are rotatably attached.

Next, as shown in FIGS. 1 to 3, the metal pin 22
-26 insert molding methods will be explained.

First, FIG. 1 explains insert molding of metal pins 22, 24, 25, and 26 other than the stepped metal pin 23 with respect to the metal pin 22.

A horizontal flange 31 is integrally formed near the lower end of the vertical metal pin 22, and a conical tapered surface 32 is formed at the lower end of the metal pin 22.

On the other hand, among the molds 34 and 35 for horizontally injection molding the base plate 21 with synthetic resin in the cavity 33, one mold 34 has a vertical pin insertion hole 36 facing the cavity 33 and a horizontal flange. A fitting hole 37 is formed in the other mold 35, and a conical bearing hole 38 facing the cavity 33 is formed in the other mold 35.

Therefore, the metal pin 22 is inserted vertically into the pin insertion hole 36, the flange 31 is fitted into the flange fitting hole 37, and the tapered surface 32 is fitted into the bearing hole 38, and then the mold 34 is inserted. , 35 is molded. Then, molten synthetic resin is injected into the cavity 33 and the base plate 21 is injection-molded using the synthetic resin, and at the same time, the metal pins 22 are integrally insert-molded into the base plate 21.

At this time, by regulating the flange 31 horizontally by the flange fitting hole 37 into which the flange 31 is fitted, the perpendicularity θ of the metal pin 22 with respect to the horizontal base plate 21 can be adjusted with high precision. I can put it out.

Furthermore, the bearing hole 3 into which the tapered surface 32 is fitted
8, it is possible to perform positioning (centering) of the center position P of the metal pin 22 from the reference with high precision.

Next, FIG. 2 illustrates insert molding of the stepped metal pin 23.

This stepped metal pin 23 is connected to the tape guide 6.
In order to configure this, a pair of horizontal flanges 40 and 41 for regulating the height of the magnetic tape 5 are integrally formed at both the upper and lower ends of the pin body 39, and a conical tapered surface 32 is formed at the lower end of the pin body 39. is formed.

On the other hand, the pin insertion hole 36 of the mold 34 is formed to have a large diameter to match the diameters of both flanges 40 and 41.

Therefore, in the case of this stepped metal pin 23,
The pin body 39 is vertically inserted into the large-diameter pin insertion hole 36 together with both flanges 40 and 41, and the flange fitting hole portion 36, which is the upper end that is fitted into the upper flange 40 of the pin insertion hole 36, is inserted vertically into the large diameter pin insertion hole 36.
By a, the verticality θ of the stepped metal pin 23 is determined with high precision. Note that the positioning (centering) of the center position P of the stepped metal pin 23 from the reference is performed using the tapered surface 3 as described above.
2 is fitted into the bearing hole 38.

Next, FIG. 3 shows a modification in which the tapered surfaces 32 at the lower ends of the metal pin 22 and the stepped metal pin 23 are formed into a truncated cone shape, and the bearing hole into which they are fitted is formed. 38 is also formed in the shape of a truncated cone, and even with this modification, the centering of the center position P of the metal pin 22 and the stepped metal pin 23 from the reference can be performed with high precision.

As described above, in this data cartridge, the base plate 21 is made of synthetic resin, and the base plate 21 is made of synthetic resin.
The verticality θ, which is the planting accuracy of the plurality of metal pins 22 to 26 insert-molded in 1, and the positioning (centering) of the center position P of each metal pin 22 to 26 from the reference can be determined with high precision. can.

Therefore, the tape reel 4 and the three rollers 7, which are rotatably attached to the outer periphery of the metal pins 22 and 24,
8 has high mounting precision and rotational precision, the belt 9 runs stably, and the magnetic tape 5 wound around the tape reel 4 does not have uneven winding or irregular winding. In addition, the tape guide 6 and the metal pin 2 constituted by the stepped metal pin 23
Base plate 21 of the tape guide pin composed of 6
Since the mounting precision is also high, the magnetic tape 5 can be run stably with high precision.

Therefore, it is possible to prevent off-track of the magnetic head 12 with respect to the magnetic tape 5 during recording and reproduction, and to perform high-density recording and reproduction.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various effective modifications can be made based on the technical idea of the present invention.

Furthermore, the present invention is not limited to data cartridges, but can be applied to various tape cartridges.

[0039]

[Effects of the Invention] Since the present invention is constructed as described above, it produces the following effects.

[0040] According to a first aspect of the present invention, when the base plate is molded from synthetic resin, a plurality of metal pins for attaching tape reels and rollers are integrally insert-molded into the base plate.
Since the base plate can be made of synthetic resin, processing is very easy, and costs can be reduced and productivity can be improved. Furthermore, by using synthetic resin for the base plate, the weight of the entire cartridge can be reduced, making it easier to handle the cartridge. In addition, the problem of scratches does not occur with the insert-molded metal pin.

[0041] According to claims 2 and 3, when a plurality of metal pins are integrally insert-molded into a base plate molded from synthetic resin, the perpendicularity of the metal pins can be achieved with high precision by the flanges of the metal pins. In addition, since the tapered surface of the metal pin enables highly accurate positioning (centering) of the center position of the metal pin from the reference, it is possible to improve the precision of planting the metal pin. Therefore, the mounting precision and rotational precision of the tape reel or roller rotatably attached to the outer periphery of the metal pin are high, the running performance of the tape is improved, and high-density recording and reproduction can be performed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view illustrating insert molding of a metal pin according to an embodiment of the present invention.

FIG. 2 is a cross-sectional side view illustrating insert molding of the stepped metal pin same as above.

FIG. 3 is a cross-sectional side view illustrating insert molding of a modified example of the same.

FIG. 4 is a cross-sectional side view taken along the line AA in FIG. 8;

5 is a cross-sectional side view taken along the line BB in FIG. 8; FIG.

FIG. 6 is a cross-sectional side view taken along the line CC in FIG. 8;

7 is a cross-sectional side view taken along the line DD in FIG. 8; FIG.

FIG. 8 is an exploded perspective view of the entire data cartridge.

FIG. 9 is a partially cutaway plan view of a conventional data cartridge.

FIG. 10 is a cross-sectional side view illustrating a conventional metal pin press-fit structure.

FIG. 11 is a cross-sectional side view illustrating a conventional method of press-fitting a metal pin.

[Explanation of symbols]

1 Cartridge 3 Upper cover 4 Tape reel 5 Magnetic tape (tape) 5a Tape winding section 7 Belt drive roller (roller) 8 Belt guide roller (roller) 9 Belt 21 Base plate 22 Metal pin 23 Stepped metal pin 24 Metal pin 25 Metal pin 26 Metal pin 31 Flange 32 Tapered surface 33 Cavity 34 Mold 35 Mold 36 Pin insertion hole 37 Flange fitting hole 38 Bearing hole

Claims (3)

[Claims] Claim 1: A tape wound around a pair of tape reels is stored in a cartridge constituted by a base plate and an upper cover, and a belt is placed between a plurality of rollers rotatably mounted on the base plate. The tape cartridge is configured such that the belt is wound around the tape reel, and the belt is pressed against the outer periphery of the tape winding portion of the pair of tape reels, and the tape reel is rotationally driven by the belt via the tape winding portion. A tape cartridge characterized in that the plate is molded from synthetic resin, a plurality of metal pins are integrally insert-molded into the base plate, and the tape reel or roller is rotatably supported by these metal pins. . [Claim 2] A claim characterized in that flanges are integrally provided near the lower ends of the plurality of metal pins, the flanges regulate the verticality of the metal pins, and the metal pins are integrally insert-molded on the base plate. The tape cartridge according to item 1. 3. A tapered surface is formed at the lower end of the plurality of metal pins, and the center position of the metal pin is regulated by the tapered surface, and the metal pin is insert-molded integrally with the base plate. 2. The tape cartridge according to 1 or 2.