JPH0747358Y2 - Tape cartridge - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cartridge having an improved means for pushing down and urging a tape reel.

[0002]

2. Description of the Related Art In a video tape cartridge, a reel pressing member is provided on an upper wall of a case in order to suppress vertical vibration when the tape reel engages with a drive shaft and rotates. Is urged downward. Generally, a leaf spring is used for the reel pressing member (Japanese Utility Model Laid-Open No. 61-189479).

[0003]

In the reel pressing member made of a leaf spring, the center of the plate surface is fixed to the upper wall of the case by caulking, and the free end of the reel pressing member elastically forms a protruding projection on the center upper surface of the tape reel. It is held down to. Therefore, the reel pressing force is likely to vary due to an error in assembling the leaf spring. In some cases, the projection of the tape reel may be pressed obliquely, and the pressing force of the tape reel and the stability in that direction are lacking. For example, if the pressing force is excessive, there is a disadvantage that the tape running resistance increases, and if the pressing force is in the wrong direction, the tape reel tends to laterally shift and rattling with respect to the drive shaft. Incidentally, Japanese Utility Model Laid-Open No. 58-87186 discloses that a leaf spring is fixed to the center of the upper surface of a tape reel, and a projecting shaft that comes into contact with the case upper wall is provided on the upper surface. With this, the pressing force and its directionality can be stabilized, but abnormal wear of the upper wall of the case in contact with the protruding shaft cannot be avoided, which is still a problem in practical use.

The object of the present invention is to correctly press the tape reel from directly above, improve the stability of the pressing force and the direction, and further enable the reel pressing member to exert the centering function,
This is to improve the stability of tape running by always holding and holding the tape reel in an appropriate position.

[0005]

The present invention has a main body case 1
In the tape cartridge in which the tape reel 2 is rotatably accommodated by being positioned on the drive shaft insertion hole 5 provided through the case bottom wall 1b, a core shaft 12 is provided at the center of the upper surface of the tape reel 2. Main body case 1 facing the core shaft 12
The reel retainer member 7 is vertically movably supported on the inner surface of the window plate 1a on the upper wall.
The spring 9 mounted between the reel a and the reel pressing member 7 urges it downwardly so that a pressing seat 11 recessed in the lower surface of the reel pressing member 7 abuts the core shaft 12 from above. It is a requirement that the pressing seat 11 is formed in a partially spherical shape, and a floating clearance E is provided between the opening edge of the pressing seat 11 and the core shaft 12. It has a separate window plate 1a attached to the upper wall of the main body case 1, the window plate 1a is provided with a through hole 6, and the reel holding member 7 is provided.
The engaging claw 8 is provided on the upper surface of the
By engaging with, the reel pressing member 7 is supported on the window plate 1a so as to be movable up and down, and the other configurations can be made the same.

[0006]

The reel holding member 7 and the spring 9 are unitized and integrally assembled on the inner surface side of the window plate 1a fixed to the main body case 1. The pressing seat 11 on the lower surface of the reel pressing member 7 is
Since the concave portion is formed in the partial spherical shape, even when the center of the core shaft 12 of the tape reel 2 and the center of the reel pressing member 7 are deviated, the component force toward the center of the pressing seat 11 is reduced.
It exerts a centering function by acting on 2. The loose clearance E between the opening edge of the pressing seat 11 and the core shaft 12 allows the tape reel 2 to move in the radial direction when the drive shaft fits in the tape reel 2 to facilitate the fitting.

[0007]

According to the present invention, the reel pressing member 7 is supported on the inner surface of the window plate 1a so as to be vertically movable, and is pressed down by the spring 9 to urge the tape reel 2 downward through the core shaft 12. By doing so, it is possible to eliminate the variation in the pressing force of the reel pressing member 7 or the oblique displacement of the pressing direction, and to stably press the tape reel 2 downward. Further, a pressing seat 11 formed of a partial spherical surface is formed on the lower surface of the reel pressing member 7 so that the core shaft 12 is formed.
Since the tape is pressed from above, the deviation of the core shaft 12 in the radial direction is automatically eliminated, and the tape reel 2 can always be held and held at an appropriate position. It is possible to improve the tape running stability by eliminating the tape running defect caused by the lateral displacement of the tape in the radial direction. . On the window plate 1a, the reel pressing member 7 and the spring 9 are provided.
Since it can be supported in advance and made into a unit, the window plate 1 can be attached to the upper wall of the main body case 1 without using a conventional assembly means such as caulking, which easily causes an error.
It can be assembled easily and with high precision simply by attaching a, and it has excellent workability in assembly.

[0008]

FIG. 3 is a plan view of a tape cartridge according to the present invention, in which a tape reel 2 with a flange is rotatably built in the left and right of a main body case 1 formed by joining upper and lower cases to each other. The tape 3 fed from the tape reel 2 is guided to the front part of the main body case 1 and wound around the other tape reel 2. A front lid 4 is attached to the front portion of the main body case 1 so as to be able to open upward so as to cover and protect the outside of the front surface of the tape 3 when not in use.

In FIG. 1, each tape reel 2 is located on a drive shaft insertion hole 5 which is provided through the case bottom wall 1b.
A hub hole 2a that engages with a drive shaft on the deck side that is inserted from below, a winding drum 2b around which the tape 3 is wound,
It is provided with upper and lower flanges 2c and 2d. The case upper wall facing the upper surface including the central portion of the tape reel 2 has a window plate 1a made of a transparent plastic and attached later, and the drive shaft insertion hole 5 is formed on the plate surface of the window plate 1a. A concentric through hole 6 is formed, and a plastic reel pressing member 7 is attached to the inner surface of the window plate 1a so as to be located on the inner side of the case.

In FIG. 2, the reel pressing member 7 has a button-inverted shape as a whole, and has a 4
A book engaging claw 8 is projected, an engaging groove 10 of a compression coil type spring 9 is formed on the upper surface peripheral portion, and a pressing seat 11 (see FIG. 1) having a partially spherical shape is formed on the lower surface. is there. Window plate 1a
A spring 9 is mounted between the reel holding member 7 and the reel holding member 7, and the reel holding member 7 is attached to the window plate 1a to form a unit by press-fitting the engaging claw 8 into the through hole 6 from the inside of the case. . In this mounted state, the reel pressing member 7 is urged downward by the spring 9 and can be moved up and down against the urging force of the spring 9. Thus, the window plate 1a is post-assembled and integrated with the upper wall of the main body case 1.

At the center of the upper surface of the tape reel 2, a core shaft 12 that abuts the pressing seat 11 from the lower surface side is projected.
The core shaft 12 is formed so that its upper surface is bent in a conical surface having a gentle inclination, and its top portion is in contact with the central portion of the pressing seat 11 in a normal state. When the drive shaft fits into the hub hole 2a, a loose clearance is provided between the opening edge of the pressing seat 11 and the core shaft 12 in order to allow radial movement of the tape reel 2 and facilitate fitting. E is provided. The size of the floating clearance E in the illustrated example is set to be substantially the same as the diameter of the core shaft 12.

When the tape cartridge is not used, the tape reel 2 is pushed by the reel holding member 7 as shown in FIG.
The lower surface of the lower flange 2c is stably received by the inner surface of the drive shaft insertion hole 5, and when the tape cartridge is loaded in the deck, it is fitted into the hub hole 2a and pushes up the tape reel 2 against the spring 9, As a result, the tape reel 2 is rotationally driven while floating from the case bottom wall 1b. In this driving state, the core shaft 12 slides with respect to the pressing seat 11, but its upper surface is formed as a conical surface with a gentle slope,
No abnormal wear will occur. When the center of the core shaft 12 and the center of the pressing seat 11 deviate during driving, the reel pressing member 7 moves by the gap between the through hole 6 and the engaging claw 8, so that a large rotation resistance does not occur. (Other embodiment) The upper surface shape of the core shaft 12 can be changed to a partial spherical surface or the like. A plurality of springs 9 may be distributed and arranged. The window plate 1a
May form an integral part of the upper wall of the main body case 1, or the window plate 1a may be first assembled to the upper wall of the main body case 1. In some cases, the reel pressing member 7 and the spring 9 may be attached. Will be unitized on the inner surface side of the window plate 1a and integrally assembled later.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a reel pressing member.

FIG. 2 is a perspective view of a reel pressing member.

FIG. 3 is a plan view of a tape cartridge according to the present invention.

[Explanation of symbols]

 1 Body Case 1a Window Plate 1b Case Bottom Wall 2 Tape Reel 3 Tape 5 Drive Shaft Insertion Hole 6 Through Hole 7 Reel Holding Member 8 Engaging Claw 9 Spring 11 Pressing Seat 12 Core Shaft

Claims (2)

[Scope of utility model registration request] 1. A tape cartridge in which a tape reel 2 is rotatably accommodated in a main body case 1 by locating the tape reel 2 on a drive shaft insertion hole 5 formed through a case bottom wall 1b and rotatably housed in the center of the upper surface of the tape reel 2. A shaft 12 is provided so as to project, and a reel pressing member 7 is vertically movably supported on the inner surface of the window plate 1a of the upper wall of the main body case 1 facing the core shaft 12.
The reel pressing member 7 is pressed and urged by a spring 9 mounted between the window plate 1a and the reel pressing member 7, and a pressing seat 11 recessed in the lower surface of the reel pressing member 7 contacts the core shaft 12 from above. In the tape cartridge, the pressing seat 11 is formed in a partially spherical shape, and a floating clearance E is provided between the opening edge of the pressing seat 11 and the core shaft 12. 2. A separate window plate (1a) attached to the upper wall of the main body case (1) is provided, a through hole (6) is provided in the window plate (1a), and a locking claw (8) is provided on the upper surface of the reel pressing member (7). Is provided, and by engaging the locking claw 8 with the through hole 6,
2. The tape cartridge according to claim 1, wherein a reel pressing member 7 is supported on the window plate 1a so as to be vertically movable.