JPH0697546B2 - Tape cartridge base plate processing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for processing a base plate of a tape cartridge, and particularly to a tape cartridge in which a tape is made to run by driving a belt wound between rollers. The present invention relates to a method for processing a base plate.

[Outline of Invention]

The present invention makes a belt wound between rollers contact a tape or a tape reel wound around a tape reel,
In a method of processing a metal base plate of a tape cartridge in which a tape is made to run by driving the belt, by stamping the base plate from above and below by a horizontal upper and lower mold having a large number of small protrusions. The base plate is horizontally corrected.

[Conventional technology]

Conventionally, as a tape cartridge of a type in which a tape is run by driving a belt wound between rollers, there is an invention described in, for example, Japanese Patent Application Laid-Open No. 48-15517. In the above invention, a pair of tape reels are rotatably mounted on a base plate and a plurality of rollers are rotatably mounted, and a belt wound around the rollers with a strong tension is wound around the tape reels. It is a tape cartridge of a type in which the tape is run by contacting the tape and driving the belt. In the tape cartridge, the base plate is usually made of a metal such as a thick aluminum plate in order to keep the shaft of the roller around which the belt is wound with a strong tension fixed vertically to the base plate. There is.

The base plate is usually formed by pressing and punching a metal plate material supplied from a hoop material. The punched metal plate is warped and distorted due to curling of the hoop material. Therefore, in the conventional base plate processing step, the flatness of the base plate is obtained by pressing the metal plate from above and below with an upper die and a lower die having flat horizontal surfaces.

[Problems to be solved by the invention]

However, even if a base plate (metal plate) that has warped or distorted as described above is pressed from above and below on a flat horizontal surface, the warp or distortion is not accompanied by the fact that the base plate is a thick metal plate. Not much removed.

If the warp or distortion remains on the base plate of the tape cartridge, the shafts of the belt guide roller and the tape guide roller vertically installed on the base plate tilt sideways. When the roller shaft is tilted, the tape cannot be fed horizontally by the roller, which causes a difference in height between the tape and the recording / reproducing head, which causes defective recording / reproduction. Also, the tape curls at the top or bottom of the roller,
The tape is damaged. Further, the belt is intimately contacted with the tape wound around the tape reel and is not in contact with the tape, which may cause a defective running of the tape or the belt may be twisted and easily damaged.

Therefore, in the method of processing the base plate of the tape cartridge as described above, there has been a problem of a method of correcting the base plate flat, that is, horizontally.

The present invention provides a processing method capable of straightening the metal base plate of the tape cartridge described above very easily.

[Means for solving problems]

In order to solve the above problems, the present invention rotatably mounts a pair of tape reels on a metal base plate,
A plurality of rollers are rotatably attached to the base plate,
In a method of processing a base plate of a tape cartridge, wherein a belt wound between the rollers is brought into contact with a tape or a tape reel wound around the tape reel, and the tape is run by driving the belt. The base plate is stamped from above and below by a pair of upper and lower horizontal upper and lower dies provided with the small projections to straighten the base plate horizontally.

[Work]

According to the present invention, a metal base plate is stamped from above and below by a pair of upper and lower horizontal dies provided with a large number of small projections, thereby causing permanent deformation in the base plate to cause permanent deformation. Can be easily corrected horizontally.

〔Example〕

The present invention will be described below by taking a data cartridge for recording various data as an example.

As shown in FIGS. 1 and 3, the data cartridge 1 is a cartridge formed by screwing a case 3 molded of synthetic resin onto a metal base plate 2 such as an aluminum plate having a plate thickness of about 2.5 mm. 4 are formed.

A pair of left and right tape reels 5 are rotatably attached to the base plate 2 in the cartridge 4 by reel shafts 5a, and a magnetic tape 6 is wound around the tape reel 5. A magnetic tape 6 is also provided on the base plate 2.
A pair of left and right tape guide rollers 7 for guiding the cartridge 4 along the front side of the cartridge 4 and a pair of left and right belt guide rollers 8 for guiding the belt 10 along the rear surface of the cartridge 4 are rotatable by roller shafts 7a, 8a, respectively. The belt drive roller 9 is provided on the front side of the cartridge 4 at a substantially intermediate portion between the pair of tape guide rollers 7.
Are rotatably provided by a roller shaft 9a. The reel shaft 5a and the roller shafts 7a, 8a and 9a are all vertically planted on the base plate 2.

The belt 10 is made of an elastic belt, and is wound around the belt guide roller 8 and the belt driving roller 9 in a substantially T shape with a strong tension. A part of the belt 10 is in contact with the outer circumference of the magnetic tape 6 wound around the pair of tape reels 5.

A notch 11 into which a recording / reproducing head (not shown) in the recording / reproducing apparatus is inserted is formed at one end on the front surface side of the case 3, and the notch 11 has the notch 11 formed therein.
An opening / closing door 12 that prevents dust from adhering to the magnetic tape 6 when not in use is rotatably attached so as to open and close in the directions of arrows a and b.

As shown in FIG. 1, the base plate 2 is provided with a large number of small cubic recesses 13 which are formed by stamping (details will be described later) from the top and bottom and which alternate in the top and bottom. .

This data cartridge 1 is a recording / reproducing device (not shown).
, The end portion 14 of the opening / closing door 12 is pressed by the opening means (not shown) provided in the reproduction mounting, and the opening / closing door 12 is opened in the direction of arrow a in FIG. A recording / reproducing head (not shown) in the recording / reproducing apparatus is inserted into the notch 11, and the recording / reproducing head is brought into contact with the tape 6. At the same time, a driving roller (not shown) of the recording / reproducing apparatus is pressed against the belt driving roller 9, and the driving roller rotates the belt driving roller 9 to drive the belt 10.

Since the belt 10 is brought into contact with the outer circumference of the magnetic tape 6 wound around the tape reel 5 in a state in which a strong tension is applied, the tape reel 5 is driven by the belt 10 being driven.
Is rotated and the magnetic tape 6 is run. That is, the belt 10 is fed in the direction of the arrow f by the rotation of the belt driving roller 9 in the direction of the arrow e in FIG. 3, and the pair of left and right tape reels 5 are rotated in the clockwise direction and the counterclockwise direction, respectively. And the magnetic tape 6 has an arrow g
Be driven in the direction.

In the data cartridge 1 described above, the belt 10 is in contact with the magnetic tape 6 wound around the tape reel 5, but the tape reel 5 may be rotated by directly contacting the belt 10 with the magnetic tape 6. Good.

Next, a method of processing the base plate 2 will be described with reference to FIG.

Metal plate material 21 such as aluminum plate supplied from the hoop material 20
Is punched into a predetermined shape by a press in the X step. The stamped base plate 2 is stamped in the Y step. The stamping process is performed by pressing the base plate 2 from above and below with a pair of upper and lower horizontal molds 22 and 23 in which a large number of substantially cubic small projections 24 are arranged alternately in the vertical direction. Due to the stamping process, a permanent strain is generated in the base plate 2, and the base plate 2 is horizontally corrected following the horizontal upper and lower dies 22 and 23. It should be noted that the base plate 2 is formed with small recesses 13 which are alternately vertically arranged as shown in FIG.

The base plate 2 is a hoop material by the stamping process described above.
The warp and distortion due to the winding curl of 20 is removed and it is surely corrected horizontally. Therefore, the tape guide roller 7, the belt guide roller 8, which are rotatably supported by the roller shafts 7a, 8a, 9a vertically planted on the base plate 2,
The belt drive roller 9 and the like are not tilted, and the magnetic tape 6
And recording / reproducing failure due to height deviation between the recording / reproducing head (not shown), curling of the magnetic tape 6 occurring above or below the rollers 7-9, and contact failure between the belt 10 and the magnetic tape 6. It is possible to prevent defective running of the magnetic tape 6 and the like.

In the above embodiment, the base plate 2 is stamped by the upper mold 22 and the lower mold 23 provided with the small cubic projections 24, but the small projections provided on the upper mold 22 and the lower mold 23 are not shown. The shape of 24 is not limited to that shown in the examples, and may be any other shape such as a columnar shape.
In the embodiment, the small protrusions 24 are arranged alternately in the upper and lower sides, but they may be arranged so as to face each other in the vertical direction.

Further, the stamping process is performed not after the base plate 2 is punched as shown in the embodiment but before the punching.
Alternatively, it may be applied simultaneously with punching.

The present invention can be applied not only to the data cartridge but also to a method of processing the base plate of various tape cartridges having a metal base plate.

〔The invention's effect〕

According to the present invention, a metal base plate is stamped from above and below by a pair of upper and lower horizontal dies provided with a large number of small protrusions to cause permanent distortion in the base plate, The plate can be straightened easily and surely. In particular, according to the present invention, even a thick base plate can be easily horizontally corrected.

Further, according to the present invention, since the base plate is surely corrected horizontally, the height difference between the tape and the recording / reproducing head caused by the warp or distortion of the base plate, and the curl of the tape generated at the upper or lower part of the roller. It is possible to reliably prevent contact failure between the tape or tape reel and the belt, and prevent recording / reproduction failure, tape running failure, and damage to the tape or belt.

[Brief description of drawings]

The drawings show an embodiment in which the present invention is applied to a method of processing a base plate of a data cartridge. FIG. 1 is a sectional view taken along line II-II of FIG. 3, and FIG. 2 is a method of processing a base plate. FIG. 3 is a plan view showing the entire data cartridge. In the reference numerals used in the drawings, 1 ... data cartridge 2 ... base plate 5 ... tape reel 6 ... magnetic tape 7 ... tape guide roller 8 ... belt guide roller 9 ... belt drive roller 10 ... belt Is.

Claims (1)

[Claims] 1. A pair of tape reels are rotatably mounted on a metal base plate, a plurality of rollers are rotatably mounted on the base plate, and a belt wound between the rollers is wound on the tape reel. In the method for processing a base plate of a tape cartridge, the tape is run by contacting it with a rotated tape or tape reel, and by driving the belt, a pair of upper and lower horizontal tops provided with a large number of small protrusions. A method for processing a base plate of a tape cartridge, wherein the base plate is stamped from above and below by a mold and a lower mold so that the base plate is horizontally corrected.