JPH0726978U - Magnetic tape cartridge - Google Patents

Abstract

(57) [Summary] [Object] To provide a magnetic tape cartridge which suppresses the rattling of the shutter so that the shutter does not come off even when a strong impact is applied and the assemblability is excellent. [Structure] A magnetic tape cartridge 100 provided with a shutter 20 slidably attached to a cassette body 1 for opening and closing a hub hole and an opening of a front portion of a case body, the shutter closing the hub hole and the opening of the front portion. Is biased in the direction of the shutter, and at the edge of the shutter in the biasing direction side, a convex portion 28 protruding along the shutter moving direction or a concave portion cut along the shutter moving direction is formed. A corresponding fitting portion 13 that fits into the concave portion or the convex portion is formed on the case at a position facing the convex portion or the concave portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic tape cartridge having a structure in which a shutter fitted slidably on a casing is slid to open and close a magnetic head insertion window and a pocket for entering a pinch roller, and more particularly to a mounting structure for the shutter. is there.

[0002]

[Prior art]

 In recent years, magnetic tape cartridges are used to record information such as music and images as digital signals, and there is a generic name for a digital compact cassette (DCC). This type of magnetic tape cartridge has a structure shown in FIGS. 4 and 5, for example.

The magnetic tape cartridge 101 shown in FIGS. 4 and 5 is wound around a pair of reel hubs 2 inside a hollow box-shaped main body case 1 formed by abutting an upper half case 31 and a lower half case 32. The structure is such that the magnetic tape 3 is housed and the shutter 20 is attached to the outer surface of the case. A pair of hub holes 4 and 4 are opened in the lower half case 32 of the main body case 1, and the reel hubs 2 and 2 are mounted in correspondence with the drive insertion holes 4. A head insertion window 11 and pinch roller entry pockets 12, 12 are opened in the front wall 10 of the main body case 1 to form a traveling path for the magnetic tape 3.

The shutter 20 has openings (40, 41) of the same shape as the hub holes (4, 4) of the main body case (1) in the lower plate (21 shown in FIG. 5) of the shutter (however, in the example shown in the figure). 40 is a semi-circular fragment), and the front plate 22 is formed with a head insertion window 11 and openings 25 and 26 having the same shape as the pockets 12 and 12 for advancing the pinch rollers, respectively. It is a metal member. The shutter 20 is attached to the main body case 1 so that the main body case 1 is sandwiched between the lower surface plate 21 and the upper surface plate 23.

Further, the shutter 20 is housed in an appropriately recessed portion formed on the outer surface of the case, and is biased in the arrow F direction by a spring member (not shown) that engages with the inside of the shutter 20, and the main body case 1 4 is slidably attached to the main body case 1, and as a result, the main body case 1 is normally moved to the left side in FIG. 4 of the shutter slide surface 33, and the hub holes 4 and 4, the head insertion window 11, and the pinch roller. The entry pockets 12, 12 are closed.

On the other hand, in the case of recording / reproducing, when the magnetic tape cartridge 101 is loaded in the recording / reproducing apparatus, the shutter 20 slides the shutter slide surface 33 to the right side in the figure against the biasing force. Then, the hub holes 4 and 4 of the main body case 1, the head insertion window 11 and the pinch roller entry pocket 12 are exposed, and the drive shaft, the magnetic head, and the pinch roller (both not shown) are respectively opened. Inserted in.

As described above, the magnetic tape cartridge 101 has a structure in which each opening is opened and closed by the sliding operation of the shutter 20, and in particular, the magnetic head that is the exposed portion of the magnetic tape 3 is opened. By closing the insertion window 11 and the pockets 12 for advancing the pinch roller by the shutter 20, the magnetic tape is protected during storage.

[0008]

[Problems to be solved by the device]

 By the way, as shown in FIG. 5, the procedure for assembling the magnetic tape cartridge 101 is such that the reel hub 2 on which the magnetic tape 3 is wound in advance corresponds to the hub hole 4 provided in the lower half case 32. Then, the upper half case 31 and the lower half case 32 are abutted and integrated with each other to assemble the body case 1, and finally the shutter 20 is attached to the top plate 23. The main body case 1 is mounted so as to be sandwiched between the main body case 1 and the lower plate 20.

FIG. 6 is a cross-sectional view of the main body case 1 with the shutter 20 attached, taken along the arrow AA portion of FIG. 5. As shown in FIG. Is formed with a guide groove 34 parallel to the front wall 10 over the entire width of the shutter slide surface 33, and a claw piece 5 having an L-shaped cross section is provided on the flat surface of the lower half case 32. When the body 20 is mounted on the body case 1, the bent portion 27 provided on the front plate 23 of the shutter 20 is slidably engaged with the guide groove 34, and the shutter lower plate 21 is attached by the claw piece 5. It has a structure for supporting the end portion 29 of the. As a result, the sliding operation of the shutter 20 is made smooth and the shutter 20 is prevented from falling off.

The shutter 20 is attached to the main body case 1 by inserting the lower plate end 29 of the shutter 20 into the claw piece 5 of the lower half case 32 and at the same time folding the bent portion 27 into the upper half case. It is carried out by fitting it into the guide groove 34 of 31. However, since the shutter 20 is made of metal, it is troublesome to fit the bent portion 27 into the guide groove 34 against the rigidity of the metal. Further, since the shutter 20 is attached to the main body case 1 via a spring member (not shown) so as to be biased in the arrow F direction in FIG. 4 during storage, the spring member is also attached at the same time. There must be. As described above, mounting the shutter 20 on the main body case 1 is troublesome and the assembling property is poor.

Therefore, in order to prioritize the assemblability, the space (H) between the lower plate 21 and the upper plate 23 of the shutter 20 is such that the bent portion 27 does not separate from the guide groove 34 of the main body case 1. The thickness is set to be larger than the thickness (D) of the main body case 1, and as a result, the shutter 20 is likely to swing in the thickness (D) direction of the main body case 1, such as during manufacturing or storage. When a strong impact is applied to the bent portion 27, there is a high risk that the bent portion 27 may be separated from the guide groove 34 of the main body case 1.

Therefore, an object of the present invention is to provide a magnetic tape cartridge which suppresses the rattling of the shutter of the magnetic tape cartridge so that the shutter does not come off even when a strong impact is applied and the assemblability is excellent. Especially.

[0013]

[Means for Solving the Problems]

 The above object of the present invention is to accommodate a pair of reel hubs, each having a magnetic tape wound therein, inside a main body case on a hollow box formed by abutting a pair of upper and lower half cases in correspondence with the hub holes. A magnetic head insertion window and a pocket for entering a pinch roller are opened in the front part of the magnetic tape cartridge having a shutter slidably attached to the main body case to open and close the hub hole and the opening of the front part. In addition, the shutter is biased in a direction to close the hub hole and the opening of the front surface portion, and a projection or a shutter projecting along the shutter movement direction is provided at an end of the shutter on the biasing direction side. At least a guide-shaped recess cut along the direction of movement is formed, and the main body case has the projection. Is achieved by a magnetic tape cartridge, wherein a pair 応嵌 engagement portion fitted to the concave portion or the convex portion is formed at a position opposed to the concave portion.

[0014]

Embodiment

 Hereinafter, a magnetic tape cartridge according to the present invention will be described in detail based on an embodiment. However, the present invention is not limited to this embodiment. As shown in FIG. 1, the magnetic tape cartridge 100 according to the present embodiment has a pair of reel hubs inside a hollow box-shaped main body case 1 formed by abutting an upper half case 31 and a lower half case 32 as in the conventional case. A magnetic tape 3 wound around (not shown) is housed and a shutter 20 is attached.

A head insertion window 11 and pinch roller advancing pockets 12, 12 are opened in a front wall 10 of the main body case 1 to form a traveling path of the magnetic tape 3. Further, the shutter slide surface 33 is recessed with a gap from the other parts of the main body case 1, and a guide groove 34 is engraved on the shutter slide surface 33 over the entire width thereof, and the bent portion of the shutter 20. (Not shown) is slidably engaged. This makes the sliding operation of the shutter 20 smooth.

The shutter 20 is a metal member having a substantially U-shaped cross section in which a front plate 22 is formed with openings 25 and 26 having the same shape as the head insertion window 11 and the pockets 12 and 12 for entering the pinch rollers, respectively. The main body case 1 is attached to the main body case 1 such that the lower surface plate 21 and the upper surface plate 23 sandwich the main body case 1. The shutter 20 is attached to the main body case 1 by being urged in the direction of arrow F by a spring member (not shown), and is normally placed on the right edge side of the shutter slide surface 33 of the main body case 1 in the figure. The head insertion window 11 and the pinch roller entry pockets 12, 12 are closed to close the head insertion window 11.

On the other hand, in the case of recording / reproducing, when the magnetic tape cartridge 100 is loaded into the recording / reproducing apparatus, the shutter 20 slides the shutter slide surface 33 to the left side in the figure against the biasing force. Then, the head insertion window 11 and the pinch roller entry pocket 12 of the main body case 1 are exposed, and the magnetic head and the pinch roller (both not shown) of the recording / reproducing apparatus are inserted into the respective openings.

Furthermore, a convex portion 28 having a substantially triangular shape is formed at the edge of the front plate 22 of the shutter 20 in the biasing direction (direction of arrow F), while the front wall 10 of the main body case 1 is formed. A substantially triangular recess 13 which is a corresponding fitting portion having a shape corresponding to the protrusion 28 of the shutter 20 is formed at the end portion on the side opposite to the urging direction. The convex portion 28 and the concave portion 13 are fitted with each other by an urging force with the shutter 20 closed, and the shutter 20 is positioned thereby.

Therefore, when the cartridge is stored, that is, when the shutter 20 is closed, the convex portion 28 of the shutter 20 and the concave portion 13 of the main body case 1 are engaged with each other with an appropriate pressure contact force, and the shutter 20 of the shutter 20 is closed. The swinging in the thickness direction of the body case is effectively suppressed. Further, in the present invention, the convex portion 28 does not need to be provided on the front plate 22 of the shutter 20, and, for example, as shown in FIG. 2, the edge of the upper plate 23 of the shutter 20 in the biasing direction. It can also be formed. In that case, the concave portion 13 of the main body case 1 is provided at a portion corresponding to the formation position of the convex portion 28 of the shutter 20 at the edge of the shutter slide surface 33. Further, by providing the convex portions 28 of the shutter 20 at a plurality of positions, for example, on all the surfaces of the upper surface plate 23, the front surface plate 22 and the lower surface plate 21 which constitute the shutter 20, the swinging of the shutter 20 is further facilitated. It can be effectively suppressed.

Here, the shapes of the convex portion 28 and the concave portion 13 are not particularly limited, and the concavo-convex portion can be fitted by a semi-circular shape of a warp other than the triangular shape shown in the drawing. The shape may be changed as appropriate as long as it has an effect of attracting when sliding. Further, the convex portion 28 of the shutter 20 and the concave portion 13 of the main body case 1 may have an opposite relationship as shown in FIG.

Further, although the magnetic tape cartridge for DCC has been described in the above-mentioned embodiment, the structure of the present invention is not limited to this, for example, one having a shutter like a 3.5-inch magnetic disk cartridge. If so, it can be adapted.

[0022]

[Effect of device]

 As described above, the magnetic tape cartridge according to the present invention is provided with the convex portion or the concave portion at the end portion in the biasing direction of the shutter and the concave portion or the convex portion which engages with the convex portion or the concave portion of the shutter in the main body case. By forming the shutter, both can be engaged with each other in the closed state of the shutter to prevent the shutter from swinging in the thickness direction of the main body case or in the direction orthogonal to the sliding direction, thereby reliably protecting the magnetic tape. . In addition, the shutter does not separate from the main body case even when it receives a strong impact, which makes the product easier to handle.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic tape cartridge according to the present invention as viewed from above.

FIG. 2 is a perspective view of an essential part showing a modified example of the magnetic tape cartridge according to the present invention.

FIG. 3 is a perspective view of an essential part showing another modified example of the magnetic tape cartridge of the present invention.

FIG. 4 is a perspective view of a conventional magnetic tape cartridge as viewed from the bottom surface direction.

FIG. 5 is an exploded perspective view for explaining a procedure of mounting the shutter of the magnetic tape cartridge on the main body case.

6 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Main Body Case 2 Reel Hub 3 Magnetic Tape 4 Hub Hole 5 Claw Piece 10 Front Wall Surface 11 Head Insertion Window 12 Pinch Roller Entry Pocket 13 Recess 20 Shutter 21 Bottom Plate 22 Front Plate 23 Top Plate 25, 26 Opening 27 Bent 28 Convex part 31 Upper half case 32 Lower half case 33 Shutter slide surface 34 Guide groove 100, 101 Magnetic tape cartridge

Claims (1)

[Scope of utility model registration request] 1. A pair of reel hubs, each having a magnetic tape wound therein, are housed inside a main body case on a hollow box formed by abutting a pair of upper and lower half cases in correspondence with hub holes, and a front portion of the main body case is accommodated. A magnetic head insertion window and a pocket for entering a pinch roller are opened in the magnetic tape cartridge, and the shutter is slidably attached to the main body case to open and close the hub hole and the opening of the front portion. The shutter is biased in a direction of closing the hub hole and the opening of the front surface portion, and a projection protruding along the shutter movement direction or a shutter movement direction is formed at an end of the shutter on the biasing direction side. At least a guide-shaped recess cut along the recess is formed, and the main body case faces the projection or the recess. Magnetic tape cartridge, wherein a corresponding fitting portion fitted to the concave portion or the convex portion at a position is formed.