JP2001273740A - Tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that the reduction of the area to be attracted is resulted if the mechanical strength is intensified by making holes larger with the tape cartridge of a single reel type of the prior art formed by attracting a metallic plate fixed to the base surface of a tape reel by the magnet of the device, engaging the drive section of a recording and reproducing device with the engaging teeth formed at the base surface of the reel hub at the outer periphery of the metallic plate to rotate the reel hub, forming the holes at the metallic plate, inserting the bosses disposed at the resin reel hub into these holes and crushing the bosses by melting, thereby fixing the metallic plate to the reel hub. SOLUTION: The tape cartridge which is rotatably housed with the one tape reel made of the resin wound with the tape into a case body and is provided with the metallic plate having magnetism to be attracted to the device integrally on the outside surface side on the under surface side of the tape reel is formed with the central hole for caulking and fixing to the reel hub of the tape reel at the center of the metallic plate and this central hole is provided with a step part for accepting the molten resin. The holes of a small diameter having the plural step parts are formed around the central hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a one-reel type tape cartridge used for a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 63-251983 discloses an invention relating to a one-reel type tape cartridge. The tape reel has an upper flange and a lower flange integrally formed with a reel hub, and a magnetic metal plate is fixed to a bottom surface of the reel hub. Although a protrusion is formed on the bottom surface of the reel hub, there is no detailed description, but it is presumed that the metal plate is fixed by caulking. FIG. 6 is an exploded perspective view of a conventional one-reel type tape cartridge. FIG. 7 is a sectional view of a main part. These figures are shown upside down for easy viewing. In the cartridge, one tape reel 3 around which a tape 14 is wound is rotatably housed in a main body case composed of an upper case 1 and a lower case 2. Openings for inserting a leader block 18 drawn out by a drive member on the apparatus side are formed between the upper and lower cases 1 and 2 by the openings 12 and 22 of the upper and lower cases. The tape reel 3 is integrally formed with a reel hub 32 integrally formed with a lower flange 33. The tape reel 3 is rotatably driven by a drive device on the apparatus side through the opening 2 of the lower case 2. Engaging teeth (not shown) are provided on the inner surface of the reel hub 32, and engage with the reel brake 5 to prevent unnecessary rotation of the tape reel 3 when not in use. The reel brake 5 has a tooth portion 51 on the lower surface side, and engages with an engagement tooth portion of the reel hub 32. The reel brake 5 is constantly pressed to the brake position by the brake spring 4. The guided projection 52 of the reel brake 5 is formed with a concave portion which is slidably fitted to the guide member 13 formed on the inner surface of the upper case 1, whereby the reel brake 5 is securely positioned at the lower brake position. And the upper brake release position. A brake release projection 63 is formed on the lower surface of the reel brake 5 and penetrates into the center hole 43 at the bottom of the reel hub 32. When the brake release projection 63 is mounted on the device, the brake release projection 63 is lifted upward. 5 is lifted upward, the engagement with the tape reel 3 is released, and the tape reel 3 can rotate. The tip of the tape 14 is wound around the pin member 8. The pin member 8 is then fitted and fixed in the pin receiving recess of the leader block 18. When this cartridge is mounted on the apparatus, the drawer member on the apparatus side enters the locking recess 19 of the leader block 18 to grip the leader block 18 and then pulls out the tape to the tape take-up reel along the tape running path of the apparatus. The take-up reel is finally held in a recess formed in the outer peripheral portion of the take-up reel on the apparatus side.

[0003]

In the conventional tape cartridge, a metal plate fixed to the bottom surface of a reel hub is attracted by a magnet of an apparatus, and engaging teeth formed on the bottom surface of the reel hub on the outer periphery of the metal plate. Then, the drive unit of the recording / reproducing apparatus is engaged to rotate the reel hub. In the prior art, a hole is formed in a metal plate, and a boss (three concentrically visible in FIG. 6) provided on a resin reel hub is inserted into the hole, and the boss is melted and crushed to form a metal plate. Is fixed to the reel hub. However, in the reel hub manufactured in this manner, the area to be attracted to the device is reduced by the hole formed in the metal plate (usually three to four holes are formed for fixing the metal plate). Would. As a result, the area adsorbed to the device is reduced, and thus a problem such as a mounting error or a mounting failure to the device occurs. Therefore, an object of the present invention is to fix a metal plate to the bottom surface of a reel hub without reducing the suction area to the device.

[0004]

According to the present invention, one resin tape reel having a tape wound therein is rotatably accommodated in a case main body, and the tape reel is adsorbed to the apparatus on the lower surface side outer surface side. In a tape cartridge having a magnetic metal plate integrally provided with a tape reel, a center hole is formed at the center of the metal plate for caulking and fixing to a reel hub of the tape reel, and the center hole receives a molten resin. The above object is attained by a tape cartridge having a stepped portion, wherein a small-diameter hole having a plurality of steps is formed around the center hole. According to the present invention, there is also provided a resin tape reel in which a tape is wound in a case main body rotatably accommodated, and a magnetic metal plate which is attracted to an apparatus on a lower surface side outer surface side of the tape reel is attached to the tape reel. In the tape cartridge provided integrally with the reel, a center hole is formed at the center of the metal plate for caulking and fixing to a reel hub of the tape reel, and the center hole has a step portion for receiving molten resin, A tape cartridge is provided, wherein a concave portion corresponding to the raised portion of the center hole or a convex portion corresponding to the outer periphery of the raised portion of the center hole is formed on the metal plate mounting surface of the reel hub.

[0005]

FIG. 1 is an exploded perspective view of a tape cartridge according to an embodiment of the present invention. In this cartridge, one tape reel 3 around which a tape is wound is rotatably housed in a main body case composed of upper and lower cases 1 and 2. The lower case 2 has an opening 21 into which the drive shaft of the apparatus is inserted.
Having. Upper and lower cases 1 and 2 are formed with openings 12 and 22 for drawing out the tape. The tape reel 3 has a reel hub 32 integrally formed with an upper flange 31 and a lower flange 33 and a metal plate 7 fixed to the lower surface of the reel hub 32 to be integrated. Engaging teeth 37 are provided around the metal plate 7 to engage with the drive shaft of the device (the metal plate 7 is attracted to the drive shaft of the device and the tape reel 3 rotates). Since the tape is directly adhered to the outer peripheral surface of the reel hub by water etc.,
No fixing member for fixing the tape is provided. An engagement tooth portion 35 is provided on the inner surface of the reel hub 32 and engages with the reel brake 5 to prevent unnecessary rotation of the tape reel 3 when not in use. The reel brake 5 has a tooth portion 51 on the lower surface side, and engages with the tooth portion 35 of the reel hub 32. The reel brake 5 is constantly pressed to the brake position by the brake spring 4. The protrusion 52 of the reel brake 5 can be reliably moved up and down (brake position and brake release position) by a position restricting portion (not shown) provided on the inner surface of the upper case 1. A brake release plate 9 is interposed between the reel hub 32 and the reel brake 5. The brake release plate 9 includes a main plate 91 and leg portions 92. The leg portion 92 enters the hole 36 on the lower surface of the reel hub 32,
When mounted on the apparatus, the leg portion 92 of the brake release plate 9 is lifted upward, whereby the reel brake 5 is lifted upward to release the engagement with the tape reel 3 and rotate the tape reel 3. Will be able to The leading end of the tape is fixed to the leader member 8, and when the cartridge is mounted on the apparatus, the leader member 8 is held by the holding member of the apparatus and the tape is pulled out.
The leader member 8 includes a pin member 81 and a C-shaped clamp 8.
It consists of two. The tape is wound around the pin member 81,
The C-shaped clamp 82 is fixed by being fitted thereon. The leader member 8 is held near the openings 12 and 22 of the case when the cartridge is not used, and the opening is closed by the door member 60. Door member 60
Is always urged by a spring 61 to close the openings 12 and 22.

FIG. 2 illustrates an essential part of the present invention. FIG.
(A) is a plan view of the metal plate 7, and (b) is a cross-sectional view in the direction of the arrow. This metal plate 7 is usually formed by press working. A hole 71 is provided in the center,
There is a step 72 there. This step 72 is a reel hub 3
This is for receiving the molten resin when fixing to 2. When this step 72 is formed by press working, a raised portion 75 is formed on the side opposite to the step 72. For example, a steel plate SPCC having a thickness of 1 mm is used as the material of the metal plate 7, the center hole has a diameter of 5.2 mm, and the step height h = 0.5 to
When 0.7 mm was set, it was found that the height of the raised portion 75 from the metal plate surface was about 0.05 mm. For this reason, if the metal plate is attached to the central hole 71, the problem that the suction area of the suction surface formed in a ring shape is insufficient will be solved, but if the metal plate 7 is fixed to the bottom surface of the reel hub 32 as it is, the protrusion of the metal plate 7 It has been found that the degree of contact with the bottom surface of the reel hub differs between the portion 75 and the surrounding surface, and the metal plate becomes unstable. Therefore, in the present invention, three small holes 73 are formed around the center hole 71 at intervals of 120 degrees.
Since these small holes are not used for attaching a metal plate, the diameter may be sufficiently small, and the diameter is set to 2 mm or less which does not substantially affect the adsorption area. This small hole 73 also has a step 7
4 are formed. In this way, the raised portions 76 are also formed in these small holes 73. Although the size of the small hole 73 is small, the height of the raised portions 75 and 76 is the same in both.

[0007] The metal plate 7 is mounted on a reel hub 32. FIG. 3 is a perspective view in which the reel hub 32 is turned upside down. On the lower surface of the reel hub 32, engaging teeth 37 for engaging with the drive shaft of the apparatus are formed. A concave portion 38 for attaching the metal plate 7 is formed inside the engaging teeth 37. At the center thereof, there is a boss 38a that enters the center hole 71 of the metal plate 7. After the metal plate 7 is placed in the concave portion 38, the boss 38a is crushed by an ultrasonic welding machine, and is fixed to the reel hub 32 by caulking. Raised portion 7 of metal plate 7
The metal plate 7 to be attached is not tilted or rattled due to the abutment of 5, 76 on the surface of the recess 38. Since the small holes 73 to be formed are also small, a large adsorption area does not decrease. At this time, if a convex portion corresponding to the small hole 73 is formed in the concave portion 38 of the reel hub 32, the effect of positioning the metal plate 7 and preventing rotation can be obtained.

FIGS. 4 and 5 show another embodiment. FIG. 4 (a)
FIG. 2 is a plan view of the metal plate 7, and FIG. 2B is a cross-sectional view of a central hole 71 viewed in the direction of the arrow in FIG. The only difference from the embodiment of FIG. 2 is that no small holes are provided around the hole 71.

There is a problem if the reel hub 32 shown in FIG. 3 is attached in this state. However, the reel hub 32 shown in FIG. 5 is effective for such a metal plate 7. 3 is different from the reel hub 32 shown in FIG.
9 is provided. When the metal plate 7 is placed in the concave portion 38, the raised portion 75 is accommodated in the concave portion 39, and the central hole 7
The surface 77 of the metal plate around 1 comes into contact with the surface of the recess 38 so as to be securely fixed. Protuberance is 0.05
mm, the concave portion 39 may have a depth (for example, 0.1 mm) that does not make contact with the raised portion 75.

As still another modification, the depth of the concave portion 38 may be slightly increased, and a rib or a projection may be formed around the boss 38a so that the raised portion 75 does not contact the surface of the concave portion 38.

[0011]

According to the present invention, the metal plate can be accurately fixed to the reel hub (even if the central portion of the metal plate rises, the metal plate does not rattle after the metal plate is fixed. The center of the metal plate It is possible to secure only the part, a wide range of suction part can be secured, and mounting mistakes to the apparatus can be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a tape cartridge according to an embodiment of the present invention.

2A and 2B show a metal plate according to an embodiment of the present invention, wherein FIG. 2A is a plan view and FIG. 2B is a cross-sectional view as viewed in the direction of the arrow in FIG.

FIG. 3 is a perspective view from the bottom side of the reel hub according to the embodiment of the present invention.

4A and 4B show a metal plate according to another embodiment of the present invention, wherein FIG. 4A is a plan view, and FIG. 4B is a cross-sectional view as viewed in the direction of the arrow in FIG.

FIG. 5 is a perspective view from the bottom side of a reel hub of another embodiment.

FIG. 6 is an exploded perspective view of a conventional one-reel type tape cartridge viewed from the bottom side.

FIG. 7 is a sectional view of a conventional tape cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 3 Tape reel 4 Brake spring 5 Reel brake 7 Metal plate 8 Leader member 32 Reel hub 33 Lower flange 35 Teeth 36 Hole 37 Engaging tooth 38 Recess 38 a Bos 39 Recess 71 Center hole 72 Step 73 Small hole 74 Step 75 Projection 76 Projection 77 Metal plate surface

Continuation of the front page (72) Inventor Akio Momoi 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDC Corporation (72) Inventor Masatoshi Okamura 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation

Claims (2)

[Claims] A tape reel is provided with a resin tape reel wound with a tape wound in a case main body, and a magnetic metal plate which is attracted to an apparatus on a lower surface side outer surface side of the tape reel. In a tape cartridge integrally provided with, a center hole is formed at the center of the metal plate for caulking and fixing to a reel hub of the tape reel,
This center hole has a step to receive the molten resin,
A small diameter hole having a plurality of steps is formed around the center hole. 2. A resin-made tape reel wound with a tape wound in a case body is rotatably accommodated, and a magnetic metal plate which is attracted to a device is attached to a lower surface side outer surface side of the tape reel by the tape. In the tape cartridge provided integrally with the reel, a center hole is formed at the center of the metal plate for caulking and fixing to a reel hub of the tape reel, and the center hole has a step portion for receiving molten resin, A tape cartridge, wherein a concave portion corresponding to a raised portion of the center hole or a convex portion corresponding to the outer periphery of the raised portion of the center hole is formed on the metal plate mounting surface of the reel hub.