JPH0521743Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a tape cartridge incorporating a hub lock plate for preventing the hub from rotating, and measures are taken to prevent molding defects in the hub lock plate.

[Conventional technology]

Conventionally, tape cartridges incorporating this type of hub lock plate are known, for example, those shown in FIGS. 6 to 8. This shows a digital recording and reproducing audio tape cartridge, in which a pair of left and right hubs 3, 3 around which a tape 2 is wound are rotatably arranged inside a main body case 1 of the cartridge.

Tape outlets 4, 4 are formed on the left and right sides of the main body case 1, and a pocket 5 for tape loading is formed between the tape outlets 4, 4, respectively. The tape 2 is led out from one hub 3 through a tape outlet 4 in front of it to a pocket 5, and is wound onto the other hub 3 located behind it through the other tape outlet 4.

On the front side of the main body case 1, a front lid 6 for protecting the tape is attached to a shaft 7 that extends between a position in which the pocket 5 and the front surface of the opening of the tape outlet 4 are closed (when not in use) and an upwardly open position (in use). It is rotatably pivoted around the body.

Inside the main body case 1, a hub lock plate 8 that prevents the left and right hubs 3 from rotating when not in use has a rear locking position where the hubs 3 engage with the circumferential surface of the upper end shaft of the hub 3, and a rear locking position where the hub lock plate 8 prevents the left and right hubs 3 from rotating when not in use. The front lid 6 is arranged so as to be freely movable in the front and back direction between the front unlock position and the front unlock position, and is always urged to move toward the lock position by a spring member 9. When the recorder is loaded, the front lid 6 is opened upward by an operating member on the recorder side. The hub lock plate 8 is pulled forward to the unlocked position in conjunction with the rotation.

The hub lock plate 8 is entirely made of plastic molded product, and has a lock pawl 10 that can be freely engaged with and detached from the hub 3.
A main plate 8a having a strip shape long in the left-right direction and having 10
and side plates 8b, 8b, which are connected downward from the left and right ends of the main plate 8a at a substantially right angle. Left and right side plates 8
The arm portion 8c extends forward from the lower end of each of the arms b and 8b,
A passive protrusion 11 is provided at the tip of the arm portion 8c to protrude outward. This passive protrusion 11 can be freely engaged with and disengaged from an engaging pawl 12 protruding from the rear end of the shaft 7 of the left and right side pieces 6b of the front cover 6, and as shown in FIG.
In the closed position, the engaging pawl 12 is disengaged from the driven protrusion 11, and as the front cover 6 opens, the engaging pawl 12 abuts and engages with the driven protrusion 11, and the hub lock plate 8 is unlocked from the front as described above. It is designed to be towed and moved in the direction of the position.

[Problem that the invention attempts to solve]

The problem is that the plastic hub block plate 8 is susceptible to molding defects due to its shape.

That is, the hub lock plate 8 is formed by bending a side plate 8b at a right angle to the end of the main plate 8a, and therefore the side plate 8b tends to warp inward as shown by the broken line F in FIG. Although the reason for this is not certain, it is thought that the flow of the resin from the cavity of the main plate 8a to the cavity of the side plate 8b is impaired during injection molding, resulting in distortion due to the difference in shrinkage during cooling.

If the side plate 8b of the hub lock plate 8 is warped inward as described above, the main body case 1
When the hub lock plate 8 is installed in a
This causes a problem in that the interlocking operation with the engaging pawl 12 becomes unstable, and the hub lock plate 8 cannot be reliably released. Specifically, when the front cover 6 is rotated to open upward, the engagement claw 12 does not engage with the passive protrusion 11, resulting in a missed state. Note that the edges of each side piece 6a of the front lid 6 may abut and engage with the passive protrusion 11.

The purpose of this invention is to prevent the side plates from warping by modifying the shape of the hub lock plate in a tape cartridge incorporating such a plastic hub block plate, thereby preventing malfunction of the hub block plate. shall be.

[Means for solving problems]

In this invention, the main plate 8a is placed at the corner where the main plate 8a and the side plate 8b of the plastic hub block plate 8 intersect.
A part of it protrudes slightly outward in the longitudinal direction of this, or
Another feature is that a part of the side plate 8b is provided with a protrusion 13 that slightly protrudes upward in the height direction thereof.

[Effect]

When the protrusion 13 is provided on the hub lock plate 8 as described above, the cross-sectional shape of the intersection of the main plate 8a and the side plate 8b will be T-shaped.
Therefore, during molding, the side plate 8b is removed from the end of the main plate 8a.
This improves the flow of resin and makes molding easier. As a result, distortion due to shrinkage can be prevented as much as possible, so warping can be prevented.

[Effect of idea]

As described above, according to the present invention, the hub lock plate 8
By simply providing protrusions 13 at the protruding corners of the main plate 8a and side plates 8b, the side plates 8b can be prevented from warping, so the hub lock plate 8 can be operated stably and reliably, resulting in high reliability. You can get something.

[First Embodiment] A first embodiment of the present invention will be described based on FIGS. 1 and 2.

Since the overall structure of the tape cartridge is substantially the same as that of the conventional tape cartridge described above, the same reference numerals will be given and the explanation thereof will be omitted, and only the points that are different from the conventional hub lock plate 8 made of plastic will be explained.

Here, in the hub lock plate 8, a main plate 8
A protrusion 13 having a shape that a slightly protrudes outward in the longitudinal direction is provided.

In such cases, by providing the protrusion 13,
Warping and deformation of the side plate 8b can be prevented. As a result, the sliding performance of the hub block plate 8 can be well ensured, and when the front cover 6 is rotated upwardly, a part of the side piece 6a (the engaging pawl 12) of the front cover 6 engages with the passive protrusion 11 of the hub block plate 8. This ensures reliable abutment and engagement.

[Second Embodiment] FIG. 3 shows a second embodiment of the present invention, in which the hub block plate 8 has a main plate 8a and a side plate 8b at the protruding corners thereof, with the side plate 8b extending upward in the height direction. A slightly protruding protrusion 13 is provided. In this case as well, warpage could be reduced in the same way.

[Third Embodiment] FIG. 4 shows a third embodiment of the present invention, in which a hub block plate 8 has a shape similar to that of the first embodiment at the protruding corners of the main plate 8a and side plate 8b. A protrusion 13 is provided, and the protrusion 13 and the side plate 8
A rib 14 is provided at the corner where b intersects.

According to this, from the main plate 8a to the side plate 8b during molding.
This improves the flow of resin to the main plate 8a and the side plate 8b, preventing distortion due to shrinkage.
It also prevents excessive stress concentration, which tends to occur at the corners where the two intersect, and provides a reinforcing effect.

[Fourth Embodiment] FIG. 5 shows a fourth embodiment of the present invention, in which the main plate 8a extends outward in the longitudinal direction of the hub block plate 8 at the projecting corner of the main plate 8a and the side plate 8b. Two protrusions 13 are provided, a protrusion 13 that protrudes slightly, and a protrusion 13 that protrudes slightly upward in the height direction of the side plate 8b, and an inner corner where the protrusions 13 intersect, A rib 14 is provided at each corner portion where the rib 13 and the side plate 8b intersect.

According to this, the effect of preventing distortion and reinforcing the side plate 8b can be expected to be greater than that of the first embodiment.

[Brief description of the drawings]

Figures 1 and 2 show a first embodiment of the present invention, with Figure 1 being a front view of Halloblock and Figure 2
The figure is an internal plan view of the tape cartridge. FIG. 3 is a front view of a hub lock plate showing a second embodiment of the present invention. FIG. 4 is a front view of a hub lock plate showing a third embodiment of the present invention. FIG. 5 is a front view of a hub lock plate showing a fourth embodiment of the present invention. 6 to 8 show a conventional tape cartridge, FIG. 6 is an internal plan view partially cut away, FIG. 7 is a front view of the hub lock plate,
FIG. 8 is a sectional view taken along the line A--A in FIG. 6. 1...Body case, 2...Tape, 3...Hub, 6...Front cover, 6a...Side piece of front cover, 8...Hub block plate, 8a...Main plate of hub block plate, 8b
... Side plate of the hub lock plate, 8c... Arm portion of the hub lock board, 11... Passive protrusion, 13... Protrusion.

Claims (1)

[Scope of claim for utility model registration] Front cover 6 for tape protection on the front side of main body case 1
A hub 3 with tape 2 wrapped around it and a hub lock plate 8 made of plastic for preventing the hub from rotating are arranged inside the main body case 1, and the hub lock plate 8 has a lock claw 10 that can be freely engaged with and detached from the hub 3. A main plate 8a having a long strip shape in the left and right direction.
and side plates 8b, 8b, which are connected downward from both left and right ends of the main plate 8a at a substantially right angle and have passive protrusions 11 that can be freely engaged with and detached from the front cover 6. At the corner, main plate 8
A tape cartridge characterized in that a protrusion 13 is provided such that either a protrudes slightly outward in the longitudinal direction, or a protrusion 13 protrudes slightly upward in the height direction of the side plate 8b.