JPS63179481A - Tape cartridge - Google Patents

Abstract

PURPOSE:To simplify a front cover switching operation mechanism at the deck side by always providing torque in the closing direction through the exertion of the pressing force of a pressing force provision member to a slide face formed at the upper end circumferential ridge of the side wall piece. CONSTITUTION:The pressing force provision member 15 is loaded on the rear position of the side wall piece 5 on the outer face of the side wall 6 movably freely in the forward/backward direction and always moved and energized forward. On the other hand, a slide contact face 8 to which the tip of the pressing force provision member 15 is slid in response to the switching driving of the front cover 4 is formed the upper end circumferential ridge of the side wall piece 5, the pressing force of the pressing force provision member 15 is exerted on the slide face 8 to provide torque in the closing direction to the front cover 4 at all times. As the pressing force provision member 15, a slider 1 in direct contact with the slide face 8 of the side wall piece 5 and the spring 12 energizing the slider 11 in the direction of the side wall piece 5 are combined or the plate spring 12 in direct contact with the slide face 8 of the side wall piece 5 is used. Thus, the front cover switching operation mechanism is simplified remarkably.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tape cartridge in which a front cover for protecting the tape is attached to the front side of the main body case so that it can be opened and closed, and the opening and closing mechanism of the front cover has been improved. It is something that

[Conventional technology]

Conventionally, as this type of tape cartridge, a small video tape cartridge as shown in FIGS. 10 and 1) has been proposed (for example).

Utility Model Application No. 59-5077, Utility Model Application No. 59-20489
Publication No.). In this case, a set of left and right reels 2 are housed in a main body case 1, the tape 3 wound on each reel 2 is led out to the front side of the main body case 1, and a front lid 4 is attached to the main body in order to protect the tape 3. It is attached to Case L.

This front cover 4 is formed into a flat plate shape that covers the tape 3 led out to the front side of the main body case 1, and has side wall pieces 5,5 extending rearward from its left and right ends. The upper end portions of the main body case 1 are rotatably connected to the upper front ends of the outer surfaces of the left and right side walls 6, 6 of the main body case 1 by means of a rotation shaft 7 such as a roll pin.

An opening/closing holding means is provided between one side wall piece 5 of the front M4 and the side wall 6 of the main body case 1 to hold the front M4 in an upwardly open position and a closed position, respectively.

The opening/closing holding means for the front lid 4 includes an open posture holding surface 8a and a closed posture holding surface 8b formed on the upper end surface around the rotating shaft 7 of the side wall piece 5 of the front cover 4 and the rear end surface perpendicular thereto; A horizontal groove 9 and a vertical groove 10 are formed on the outer surface of the side wall 6 at the rear of the side wall piece 5, and the slider 1) is slidably fitted in the horizontal groove 9 in the front and rear direction, and A U-shaped leaf spring 12 is inserted from above the groove, and the spring 12 constantly moves and urges the slider 1) forward, so that the front end surface 1)a of the slider 1) is held on the open posture holding surface 8a or the closed posture holding surface 8a. It is pressed into contact with the surface 8b. In such a case, the closed position of the front cover 4 will be
1) As shown by the solid line in the figure, the slider 1) is held by bringing the front end surface 1)a into contact with the closing posture holding surface 8b and pressing and biasing the front cover 4 in the closing direction. As shown in FIG. 10, as the front cover 4 rotates upward, the posture switching point 8c at the corner where the open posture holding surface 8a and the closed posture holding surface 8b intersect slides on the front end surface IIa of the slider 1). The slider 1) is moved backward, and the switching point 8c is set to the rotating shaft 7.
When the slider 1) crosses the dead point center line S passing through the center line S, the slider 1) moves forward by the force of the spring 12, and its front end surface 1)a opens and touches the posture holding surface 8a, as shown by the imaginary line in Figure 1). The front cover 4 is held in an upwardly open position. When the front cover 4 is rotated from the top open state to the closing direction, the switching point 8c moves to the slider 1).
The slider 1) is moved backward while sliding on the front end surface 1)a of the slider 1), and when the switching point 8c crosses the dead center center point S,
Slider 1) Moves forward with spring 120 force, its front end surface 1)
a to the closed posture holding surface 8b as described above, and then close the front lid 4.
Hold it in its original closed position.

In this way, when maintaining the closed position of the front M4, the slider 1) that applies rotational force in the closing direction to the side wall piece 5 of the front lid 4 and the pressing force applying member of the spring 12 are attached to the main body case 1. By attaching it to the outer surface of the side wall 6 in the example, the assembly can be made more compact and easier by utilizing the dead space on the outer surface of the case, compared to the case where the pressing force applying member is installed inside the case 1. This is especially advantageous for small tape cartridges.

[Problems to be Solved by the Invention] However, in the above-mentioned opening/closing mechanism of the front M4, when the front lid 4 is opened, this opening posture is caused by the opening posture holding surface 8 of the side wall piece 5.
a and the slider 1). Therefore, once the front cover 4 is opened,
However, it is suitable for use when loaded into an adapter, for example.

It is a little difficult to load the camera into a video deck or video camera with the front lid 4 closed, and then close the front M4 again to take it out. That is,
When this tape cartridge is loaded onto a deck or the like, the operating member on the deck side is operated in the direction of arrow A in the figure (1) to push open the front cover 4, but when the tape cartridge is taken out from the deck, the operating member is operated. Direction B different from direction A
It becomes necessary to close the front cover 4 by pushing it from the bottom, which causes a problem that the front cover opening/closing operation mechanism on the deck side becomes complicated.

Furthermore, if the front cover 4 is accidentally opened by the user, it remains open, causing the tape 3 to lose its protective function.

This invention was made to solve this problem, and in order to make the tape cartridge smaller and easier to assemble, basically, as with the conventional tape cartridge, a tape cartridge is installed on the outer surface of the side wall of the main body case. The front lid can be opened and closed on the deck side by using a mechanism that uses the side wall pieces of the front lid to close and bias it, and then applying a rotational force to the front lid in the closing direction regardless of its opening angle. To provide a tape cartridge whose mechanism can be simplified and whose front cover can be automatically closed and sufficiently protect the tape even if the front cover is accidentally opened.

[Means for solving problems]

In order to achieve the above object, in the first aspect of the present invention, a portion near the upper end of the side wall piece 5 of M4 before opening and closing the front side of the main body case 1 is placed around the rotation axis 7 on the outer surface of the side wall 6 of the main body case l. The front lid 4 is rotatably pivoted to the front lid 4, and the side wall piece 5 of the front lid 4 is used to always apply a rotational force in the closing direction to the front lid 4. That is, the pushing force applying member 15 is mounted on the outer surface of the side wall 6 at a rear position of the side wall piece 5 so as to be movable in the front-back direction and always urged to move forward. On the other hand, a sliding surface 8 is formed on the upper edge of the side wall piece 5, on which the tip of the pressing force applying member 15 slides as the front cover 4 is rotated to open and close.

By applying the pressing force of the pressing force applying member 15 to the sliding surface 8, a rotational force in the closing direction is constantly applied to the front lid 4.

Here, the pressing force applying member 15 is composed of a combination of a slider 1) that directly contacts the sliding surface 8 of the side wall piece 5, and a spring 12 that urges the slider 1) to move in the direction of the side wall piece 5. Alternatively, it is optional to configure the plate spring 12 in direct contact with the sliding surface 8 of the side wall piece 5.

The sliding surface 8 of the side wall piece 5 does not need to be formed into a curved surface or an inclined surface. Especially when forming on a curved surface, a logarithmic spiral line shape centered on one rotation axis is used.

Alternatively, it is preferable to form it into a similar curved shape.

Providing a recess 16 in a part of the sliding surface 8 of the side wall piece 5, into which the pressing force applying member 15 falls and engages in order to maintain the closed position of the front lid 4, prevents unexpected external forces of the front lid 4 from occurring. This is preferable for preventing opening.

In the second aspect of the present invention, the arm portion 13 extends rearward from the upper end of the side wall piece 5, and the lower edge 14 of the arm portion 13 is formed into a slope that slopes upward toward the rear. The pressing force applying member 1 is located below the arm portion 13 in
5 is mounted so that it is movable in the vertical direction and is always urged to move upward, and the upper end of the pressing force applying member 15 always pushes up the rear part from the center of the rotating shaft 7 on the lower edge 4. This is made by constantly applying a rotational force in the closing direction to the front M4.

Here, as the pressing force applying member 15, the arm portion 1 of the side wall piece 5
The slider 1) is in direct contact with the lower edge 14 of the arm 13, and the spring 12 is configured to move the slider 1) upwardly, or the spring 12 is in direct contact with the lower edge 14 of the arm 13. That is optional.

A recess 16 on a portion of the lower edge 14 of the arm 13 is engaged with the pressing force applying member 15 in order to maintain the closed posture of the front M4.
It is preferable to provide the front cover 4 in order to prevent the front cover 4 from being opened accidentally due to external force.

〔Effect of the invention〕

According to the first invention configured as described above.

A pressing force is applied to the sliding surface 8 of the side wall piece 5 of the front cover 4 by a pressing force applying member 15 mounted on the outer surface of the LIJ wall 6 to constantly maintain the front M.
4 to generate a rotational force in the closing direction, the pushing force applying member 15 can be made compact and simple by effectively utilizing the dead space on the outer surface of the side wall 6, similar to conventional existing products. It has the advantage of being able to be incorporated, and what's more, it is sufficient to have only one operating member for pushing and opening the front cover 4 as an opening/closing mechanism inside the video deck or video camera. It can be made significantly easier. Furthermore, even if the front cover 4 is accidentally opened, it automatically closes, so there is an advantage that the tape can be sufficiently protected.

Further, according to the second aspect of the present invention, in particular, the arm portion 13 is extended to the rear of the side wall piece 5.

A member 15 that applies a pushing force to the arm 13 is installed below the arm 13, and the length of the arm 13 is sufficiently longer behind the side wall piece 5 on the outer surface of the side wall 6 than above. Because there is as much dead space as possible.

The length of the arm 13 can be set to a necessary and sufficient length without being subject to much space constraints (the length of the arm 13 can be set to a necessary and sufficient length).
This has the advantage that the rotational moment arm can be made longer, and the front M4 can always be biased closed with a small pushing force.

[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 the conventional one described above, the same reference numerals are given and the explanation thereof will be omitted. Only the points that differ from the above will be explained.

1 and 2, a horizontal groove 9 is provided on the outer surface of the side wall 6 of the main body case 1 at the rear position of the side wall piece 5,
The slider 1) is fitted into this groove 9 so as to be slidable in the front and back direction, and a U-shaped leaf spring 12 is attached to the vertical groove 10 provided on the rear end side of the horizontal groove 9, so that the slider 1) is always held in place by this spring 12. Forced to move forward.

On the other hand, the sliding surface 8 with the slider 1) formed on the upper edge of the side wall piece 5 around the rotating shaft 7 on the front lid 4 side is
As shown in Fig. 1, it is formed into a logarithmic spiral curve shape centered on the rotation axis 7, and the vector radius R drawn from the center 0 of the rotation axis 7 to a point P on the sliding surface 8 and the tangent l at that point P. The angle σ formed is constant.

In this way, when the pushing force F of the slider 1) is applied to one point P of the sliding surface 8 formed in the logarithmic spiral curve shape of the front M4, the vertical force at the point P on the sliding surface 8 is applied. Component force N
is always directed upward from the rotating shaft 7, and a rotational moment in the closing direction is always applied to the front M4. When the pushing force F acts on one point P on the sliding surface 8, the rotational moment M of the front M4 acting on this surface 8 is F cos
It is expressed as θ×R51nθ. Here, R is the vector radius, and θ is the angle between the vector radius R and the line of action of the component force N. Also, if the friction coefficient at point P is μ, the actual rotational moment of front M4 is F-
It will be expressed as R-cos θ (sin θ-μcos θ).

If the sliding surface 8 of the front M4 with the slider 1) is formed into a logarithmic spiral curve shape centered on the rotation axis, it is also possible to set the line of action of the pushing force F of the slider 1) to pass through the rotation axis 7. Therefore, the position of the rotating shaft 7 can be set as high as possible.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention, in which a recess 16 is provided at a location where the tip of the slider 1 on the sliding surface 8 presses when the front cover 4 is in the closed position. Slider 1 is inserted into this recess 16.
) so that the tips of the two fit together. According to this, the closed posture of the front lid 4 is reliably maintained, and the front M4 is prevented from opening due to an unexpected external force.

In addition.

In this case, when opening the front lid 4 with the operating member on the deck side, it is sufficient to apply a rather strong operating force at the beginning of opening the lid to remove the tip of the slider 1) from the recess 16.

[Third example] FIG. 4 shows a third embodiment of the present invention.

A coil spring is used in place of the leaf spring 12 of the embodiment shown in FIG.

[Fourth Embodiment] FIG. 5 shows a fourth embodiment of the present invention, in which the slider 1) is omitted and one end 12a of the U-shaped leaf spring 12 is used.
A protrusion 12b is provided on the front cover 4, and the protrusion 12b is brought into direct contact with the sliding surface 8 of the front cover 4.

[Fifth Embodiment] FIG. 6 shows a fifth embodiment of the present invention, in which the arm portion 1
3 extends rearward, and the lower edge 14 of the arm portion 13 is formed into a slope that slopes upward toward the rear.

On the other hand, on the outer surface of the side wall 6 of the main body case 1.

A slider 1) is fitted into a vertical 10 provided below the arm portion 13 of the side wall piece 5 so as to be slidable in the vertical direction.
It is always pushed upward and urged. The positional relationship between the slider 1) and the arm 13 of the front cover 4 is such that the upper end of the slider 1) is always located from the center of the rotation axis 7 on the lower edge 14 of the arm 13, regardless of the opening angle of the front cover 4. It is set to push up the rear part.

The length of the arm 13 can be made as short as possible by setting the inclination angle θ of the lower edge 14 of the arm 13 to 135''.

[Sixth Embodiment] FIG. 7 shows a sixth embodiment of the present invention, in which a radius R is added to the rear end of the lower edge 14 of the arm portion 13, thereby making it easier to rotate the rotating shaft 7. The position can be set as high as possible.

[Seventh Embodiment] FIG. 8 shows a seventh embodiment of the present invention, in which a recess 16 is provided at the location where the upper end of the slider 1) on the lower edge 14 of the arm portion 13 presses when the front cover 4 is in the closed position. The upper end of the slider 1) falls into this recess 16 and fits therein. According to this, the closed posture of the front M4 is reliably maintained, and the front lid 4 is prevented from being accidentally opened due to external force. In this case, use the operating member on the deck side to open the front cover 4.
To open the lid, apply a rather strong operating force at the beginning of opening the lid to remove the upper end of the slider 1) from the recess 16.

[Eighth Example] FIG. 9 shows an eighth embodiment of the present invention.

The slider 1) is provided with an elastically deformable tongue piece 17.

Even if a slight external force is accidentally applied in the direction of opening the front cover 4 when it is in the closed state, the slider 1) is moved by the resistance of the tongue piece 17.
This is to prevent the front M4 from opening accidentally by pushing it downward. The elasticity of the tongue piece 17 is set to be relatively small, and when the front M4 is opened by the operating force of the operating member on the deck side, the tongue piece 17 is pushed down into the vertical groove 10 together with the slider 1). spring 12
Needless to say, the setting is such that both sliders 1) and 1) are pushed up by the restoring force of .

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a side view showing an enlarged main part of the tape cartridge, and FIG. 2 is a partial side view of the tape cartridge. . FIG. 3 is a side view of a tape cartridge showing a second embodiment of the present invention. FIG. 4 is a side view of a tape cartridge showing a third embodiment of the present invention. FIG. 5 is a side view of a tape cartridge showing a fourth embodiment of the present invention. FIG. 6 is a side view of essential parts of a tape cartridge showing a fifth embodiment of the present invention. FIG. 7 is a side view of a tape cartridge showing a sixth embodiment of the present invention. FIG. 8 is a side view of a tape cartridge showing a seventh embodiment of the present invention. FIG. 9 is a side view of a tape cartridge showing an eighth embodiment of the present invention. Fig. 10 and Fig. 1) show a conventional tape cartridge, Fig. 10 is a perspective view of the tape cartridge with the front cover in the middle of opening and closing, and Fig. 1) is a side view of the main parts of the tape cartridge. It is. 1... Main body case. 4...Front lid. 5...Side wall piece. 6...Side wall. 7...Rotation axis. 8... Sliding surface. 13...Arm. 14...lower edge. 15...Pushing force applying member. Inventor: Yuki Yamanaka Jitsukai
Keiyoshi Takagi Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (6)

[Claims] (1) The upper end portion of the side wall piece 5 of the front cover 4 that opens and closes the front side of the main body case 1 is pivoted on the outer surface of the side wall 6 of the main body case 1 so as to be rotatable around a rotating shaft 7, and the outer surface of the side wall 6 A pushing force applying member 15 is attached to the rear position of the upper side wall piece 5 so as to be movable in the front-back direction and always urged to move forward. Along with this, a sliding surface 8 is formed on which the tip of the pressing force applying member 15 slides, and by applying the pressing force of the pressing force applying member 15 to the sliding surface 8, a rotational force in the closing direction is constantly applied to the front lid 4. A tape cartridge characterized by: (2) The tape cartridge according to claim 1, wherein the sliding surface 8 of the side wall piece 5 is formed in a logarithmic spiral shape centered on the rotating shaft 7. (3) The tape cartridge according to claim 1, wherein the sliding contact surface 8 of the side wall piece 5 is formed in a curved shape similar to a logarithmic spiral line shape centered on the rotating shaft 7. (4) A recess 16 is provided in a part of the sliding surface 8 of the side wall piece 5, with which the pressing force applying member 15 engages in order to maintain the closed position of the front lid 4. tape cartridge. (5) The upper end portion of the side wall piece 5 of the front cover 4 that opens and closes the front side of the main body case 1 is pivoted on the outer surface of the side wall 6 of the main body case 1 so as to be rotatable around a rotating shaft 7. An arm portion 13 extends rearward from the upper end, and a lower edge 14 of the arm portion 13 is formed into a slope that slopes upward toward the rear, and is located below the arm portion 13 of the side wall piece 5 on the outer surface of the side wall 6. The pressing force applying member 15 is mounted in such a position that it is movable in the vertical direction and is always urged to move upward, so that the upper end of the pressing force applying member 15 is away from the center of the rotating shaft 7 on the lower edge 14. This tape cartridge is characterized in that the rear part is pushed up to constantly apply a rotational force in the closing direction to the front cover 4. (6) The tape cartridge according to claim 5, wherein a part of the lower edge 14 is provided with a recess 16 into which the pressing force applying member 15 is depressed and engaged in order to maintain the front lid 4 in the closed position.