JPH0355193Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention is directed to a tape cartridge in which a main body case has a back cover, and a front cover is pivotally connected to the main body case so that the front cover can be opened and closed. It is designed to open and close smoothly.

[Background technology]

For example, in a video tape cartridge, it is well known that a front cover 10 with a back cover 21 is pivotally connected to the front of a main body case 1 so that it can be opened and closed, as shown in FIGS. 2 to 4. . That is, when not in use, the front cover 10 covers the outside of the tape 2 led out to the front of the case, and when the player is loaded, the front cover 10 rotates upward to cover the tape 2.
can be pulled out to the front of the case. A tape loading pocket 19 is recessed in the front surface of the main body case 1, and the back cover 21 has a back cover mounting piece 31 on the inside of the front plate 11 of the front cover 10 at the location where the pocket 19 exists. It is pivotally connected around a pivot 22 via. Generally, sliding shafts 24a and 24b are provided on the left and right ends of the back cover 21, and S-shaped guide grooves 25 are provided on the left and right sides of the pocket 19 on the main body case 1 side.
a, 25b are provided, and each sliding shaft 24a, 24b is slidably fitted and connected to each guide groove 25a, 25b, and when not in use, the back side of the tape 2 is covered with the back cover 21, and the front cover 10 is In conjunction with the opening operation, the back cover 21 can be opened without contacting or interfering with the tape 2.

The sliding shaft 24 is attached to this type of guide groove 25a, 25b.
By sliding guides a and 24b, the back cover 2
1, the guide grooves 25a, 2
5b and the sliding shafts 24a, 24b are fitted with each other with precision. If only to ensure smooth operation of the back cover 21, each sliding shaft 24 is provided in each guide groove 25a, 25b.
It would be sufficient if the parts a and 24b were loosely fitted with a sufficient clearance, but this would cause the back cover 21 to wobble unstably during opening and closing operations. In particular, when the front cover 10 and the back cover 21 are in the closed position, the rear edge of the top plate portion 21a of the back cover 21 protrudes from the top surface of the main body case 1 as shown in FIG. Part is back cover 2
1, causing damage to the corresponding part and other serious troubles. In addition, a gap g is also created between the lower end of the front plate 11 of the front cover 10 and the lower end of the back cover 21 when not in use, and there is a risk that dust may enter through this gap g and adhere to the tape 2. Therefore, the guide grooves 25a, 25b and the sliding shaft 24a,
The fitting precision with 24b, that is, the clearance, needs to be set to a certain value or less.

However, the guide grooves 25a, 2 on the main body case 1 side
5b are provided symmetrically apart from each other on the left and right, and sliding shafts 24a,
It is quite difficult to mold the shaft 24b so that the axis does not shift vertically or longitudinally. There is also play in the pivoting portion of the back cover 21 to the front cover 10. Therefore, the sliding shaft 24a with respect to the guide grooves 25a, 25b,
If the fitting accuracy of 24b is made stricter, the dynamic frictional resistance will become excessive at least on one side, and when the player is loaded and the front cover 10 is forcibly rotated upward using a member on the player side, either the front cover 10 or the back side will be damaged. Part of the lid 21 is damaged and becomes unusable. Further, the closing operation of the front cover 10 and the back cover 21 interlocked with the front cover 10 is performed by a spring 1 which biases the front cover 10 to rotate in the closed position.
7, this spring force alone did not allow the front cover 10 and back cover 21 to close automatically, causing problems such as the player becoming unable to remove them.

In particular, as shown in FIG. 5, the back cover 21 is a plastic molded product that is thin overall and is quite long in the left-right direction, so it is susceptible to warping and deformation during or after molding. Generally, the back cover 21 has sliding shafts 24a and 24b provided on the inside of both left and right ends of the back cover 21 through brackets, and the left and right center portions face inward (toward the main case 1 side). It has a tendency to warp and deform in a protruding manner.

In this case, the respective axes of the left and right sliding shafts 24a, 24b are likely to deviate, and even if one sliding shaft 24a is fitted in the corresponding guide groove 25a so as to slide smoothly, the other sliding shaft 24b is the corresponding guide groove 25b
In particular, it is likely to come into strong contact with the front guide surface 29 (see FIG. 4) and become strained.

Such a conventional problem is caused by both guide grooves 25a and 25b.
This is because both the left and right sliding shafts 24a and 24b are set to have the same shape, and the guiding action is intended to be performed under the same conditions on the left and right sides.

[Purpose of invention]

This invention focuses on this fact and aims to prevent the back cover 21 from shaking unstably during opening/closing operations and especially in the closed position.
Nevertheless, in the present invention, the sliding shafts 24a, 24
b can slide smoothly along guide grooves 25a, 25a, and the back cover 21 can also be smoothly opened and closed in conjunction with the front cover 10.

[Summary of the idea]

In the present invention, a front cover 10 made of plastic is pivotally connected to the front surface of the main body case 1 so that it can be opened and closed, and the front plate 1 of the front cover 10 is connected to the front surface of the main case 1 at a location where a tape loading pocket 19 formed on the front surface of the case exists.
A back cover 21 is pivotally connected to the inside of the case 1 through a back cover mounting piece 31, and sliding shafts 24a and 24b protruding from the left and right sides of the back cover 21 are connected to the pocket 19 on the side of the main case 1. Guide groove 2 formed on the left and right sides of
5a and 25b, respectively, so that the back cover 21
This assumes a tape cartridge that can be opened and closed.

In the tape cartridge having such a basic configuration, the present invention sets one of the sliding shafts of the back cover 21 as the main sliding shaft 24a and the other as the secondary sliding shaft 24b, and one of the guide grooves on the main body case 1 side. into the main guide groove 25a,
The other is set in the subordinate guide groove 25b. The movement of the back cover 21 is exclusively regulated by the guided sliding movement of the main sliding shaft 24a with respect to the main guide groove 25a, and the auxiliary sliding shaft 24b simply follows and slides along the auxiliary guide groove 25b. be.

In other words, the idea is to change the diameters of the main sliding shaft 24a and the slave sliding shaft 24b to be larger or smaller. Or main guide groove 2
5a and the subordinate guide groove 25b are made to have different longitudinal widths on the left and right sides. Or combine these different shapes. In this way, the precision of the fitting between the main sliding shaft 24a and the main guide groove 25a is ensured tightly.
The fitting precision between the guide groove 25b and the slave guide groove 25b is set to be loose.

Next, a preferred embodiment thereof will be explained based on the drawings.

[Embodiment 1] Figures 1 to 6 show a first embodiment in which the present invention is applied to a small-sized video tape cartridge.

In FIGS. 2 and 3, 1 is a main body case. This is plastic upper and lower case 1
a, 1b are screwed together in a lid-like manner, and has tape reels 3, 3 on which the tape 2 is wound inside on the left and right sides. The tape reels 3, 3 are located above the left and right drive shaft insertion holes provided through the bottom wall 4 of the main body case 1,
A leaf spring 7 fixed to the inner surface of the upper wall 6 of the main body case 1
The center of rotation is biased downward. When the main body case 1 is loaded into a player, the drive shaft on the player side is fitted into the hub hole of each reel 3 through each drive shaft insertion hole. The main body case has tape path regulating pins 9, 9 at the left and right positions in the front, and the tape 2 is led out to the front of the case via these pins 9, 9.

A front cover 10 for protecting the main body case 1 with a tape that closes the front surface thereof is pivotally connected to the main body case 1 so as to be operable to open and close it.

The front cover 10 includes a front plate 11 that closes the front surface of the main body case 1 between the left and right sides, and a
A connecting piece 12 extends backward from both left and right ends of the
12, and pivot shafts 13, 13 protruding from the inner surfaces of both connecting pieces 12, 12 in an opposed manner. The left and right connecting pieces 12, 12 are connected to the front end concave portions 15a, 1 of the left and right side walls 15, 15 of the main body case 1.
5a and the pivots 13, 13 are fitted into the recessed portion 15.
The front cover 10 is fitted and pivoted into pivot holes 16, 16 provided in the a and 15a, respectively. It is pivoted to the closed position by a torsion spring 17 attached to a pivot shaft 13 on the right side of the figure.

When the tape cartridge is not in use, the front lid 10 is closed and covers and protects the outer front surface of the tape 2. When the tape cartridge is loaded into the player, the front lid 10 opens and covers the front edge of the main body case 1. A tape loading member on the player side enters into a pocket 19 formed in a large recessed shape in the left and right center portions and draws out the tape 2 to the front of the case.

The front lid 10 is located at the location where the pocket 19 is located.
As shown in Fig. 4, a plastic back cover 21 is pivotally connected to the inside of the tape 2 so as to be able to swing freely. The upper surface of the opening of the pocket 19 is sealed to prevent dust from entering from the upper and lower opening surfaces of the pocket 19 and adhering to the tape 2.

In FIG. 5, this back cover 21 has pivot shafts 22, 22 protruding from the left and right ends of the upper and lower intermediate parts, and a round shaft-shaped main sliding shaft 24a and a secondary sliding shaft that serve as cam followers at the left and right ends near the lower end, respectively. It is a plastic molded product having a protruding portion 24b and an upper surface plate portion 21a connected to the upper end thereof. A feature is that the main sliding shaft 24a is set to have a larger diameter than the subordinate sliding shaft 24b.

On the main body case 1 side, a main guide groove 25a and a subordinate guide groove 25b having substantially S-shaped cam profiles are integrally formed on the left and right side surfaces of the pocket 19, respectively. However, the master and slave guide grooves 25a and 25b have the same groove width and the same overall shape, and the groove width is set to be slightly larger than the diameter of the main sliding shaft 24a. Specifically, as shown in FIG. 6, the left and right sides of the pocket 19 are formed by a side wall 27 hanging down from the front of the upper wall 6 of the upper case 1a, and a bottom wall 4 of the lower case 1b.
It consists of a side wall 28 that is erected in series with the tape path regulating pin 9 on the top, and the upper and lower cases 1a,
1b are connected, the rear end surface of the vertical side wall 27 and the forward facing stepped end surface formed on the inner surface on the pocket side of the upright side wall 28 face each other at a constant interval, and the rear end surface and the stepped end surface are used for guiding. They constitute guide surfaces 29 and 30 before and after the grooves 25a and 25b.

The front plate 11 of the front cover 10 has an upper plate part 11
Back cover mounting pieces 31, 31 are integrally hung from the left and right sides of a, and the back cover 2 is attached to these back cover mounting pieces 31, 31.
1 are pivotally connected via the pivot shafts 22, 22 so as to be swingable.

Thus, in this case, as shown in FIGS. 1a and 1b, the main sliding shaft 24a on the back cover 21 side is in the main guide groove 25a on the main body case 1 side, and the subordinate sliding shaft 24b is in the subordinate guide groove 2.
5b in that they are slidably fitted and connected to each other. That is, the large-diameter main sliding shaft 24a is tightly fitted into the main guide groove 25a with a small clearance, and the small-diameter secondary sliding shaft 24b is loosely fitted into the secondary guide groove 25b with a large clearance. be.

In this case, both the front cover 10 and the back cover 21 are closed when the tape cartridge is not in use, and both sliding shafts 24a and 24b are in the corresponding guide grooves 2.
5a and 25b, respectively. At this time, the large-diameter main sliding shaft 24a is tightly fitted into the main guide groove 25a. This mainly prevents the lower end side of the back cover 21 from shaking and moving forward. On the other hand, since the left and right horizontally elongated back cover 21 has a tendency to warp and deform in such a way that the left and right center portions protrude inward as described above, the small-diameter secondary sliding shaft 24b is displaced forward. The front guide surface 2 of the subordinate guide groove 25b
9 is becoming easier to hit. As a result, back cover 2
The lower end of the case 1 is prevented from swinging forward around the pivot 22, and as shown in FIG.
This prevents the occurrence of rocking backlash such as protruding upward from the top surface or creating a gap g between the lower end of the back cover 21 and the front plate 11 of the front cover 10.

As the front cover 10 rotates to open upward, both sliding shafts 2
4a, 24b move upward along the guide grooves 25a, 25b, and the back cover 21 is opened in a state where it is pulled up. At this time, the movement of the back cover 21 is regulated exclusively by the sliding guide between the large-diameter main sliding shaft 24a and the main guide groove 25a, so that the back cover 21 does not wobble during operation. Originally, the dimensions of the small-diameter secondary sliding shaft 24b are set so that it fits into the secondary guide groove 25b with sufficient clearance, so as explained earlier, the left and right center portions of the back cover 21 are warped inward. By doing so, the slave sliding shaft 24b is connected to the slave guide groove 25.
Even if it comes into contact with the front guide surface 29 of b, there is room for escape, and the slave sliding shaft 24b smoothly follows and slides along the slave guide groove 25b. In addition, even if the entire back cover 21 is subjected to torsional deformation or there are accuracy errors in each part, these can be well absorbed by the above-mentioned margin of clearance, and this function ensures that the opening and closing operations of the back cover 21 will not be hindered. fulfill. When the front cover 10 and the back cover 21 are completely opened and then closed as shown by the imaginary lines in FIG. The movement of the camera back 21 is restricted.

[Embodiment 2] Figures 7a and 7b show a second embodiment of the present invention, in which the master and slave sliding shafts 24a,
24b are formed to have the same external dimensions, but the shapes of the master and slave guide grooves 25a and 25b on the main body case 1 side are different on the left and right sides. That is, the longitudinal width of the main guide groove 25a shown in FIG. 7a is the same as that of the subordinate guide groove 2 shown in FIG. 7b.
5b is set smaller than the longitudinal width of the main sliding shaft 24 as in the first embodiment.
A is tightly fitted into the main guide groove 25a with a small clearance, and the sub-sliding shaft 24b is loosely fitted into the sub-guide groove 25b with a large clearance. Even in this case, the same effects as in the above embodiment can be expected.

[Other implementation examples]

The present invention is not limited to the above embodiments. For example, the main sliding shaft 24a may have a larger diameter than the slave sliding shaft 24b, and the main guide groove 25a may have a smaller longitudinal width than the slave guide groove 25b. This is also effective in preventing breakage due to the enlargement of the diameter of 24a.

Further, in each of the above embodiments, the master and slave guide grooves 25
a, 25b have guide surfaces 29, 30 on the front and rear, respectively, but for example, they may be shaped to have only the front guide surface 29, so that the master and slave sliding shafts 24a, 24b can freely touch the guide surface 29. It may also be in a form where it is biased so that it becomes. Related to this, a separate member having guide grooves 25a, 25b may be incorporated into the main body case 1, and the guide grooves 25a, 25b
The front guide surface 29 may be urged to move toward each sliding shaft 24a, 24b. of course,
Complete guide grooves 25a and 25b may be integrally formed only by the side wall 28 erected on the lower case 1b side.

In addition, in the illustrated example, the back cover 21 is attached to the back cover mounting pieces 31, 31 and the pivot 22 at two places on the left and right of the front plate 11.
22, however, the back cover 21 may be pivotally connected via the back cover mounting piece 31 and the pivot 22 at one location on the left and right center portions of the front plate 11. Furthermore, the back cover mounting piece 31 is attached to the front plate 11.
Instead of being vertically provided from the top plate portion 11a of the front plate 11, it may be provided so as to protrude backward from the vertical plate portion of the front plate 11.

In addition, in the illustrated example, the upper surface plate portion 21a of the back cover 21
covers the upper surface of the front end of the main body case 1, including the upper surface of the opening of the pocket 19, between the left and right sides,
Depending on the design or other circumstances, the upper surface plate portion of the back cover 21 may be limited in left and right width to cover only the upper surface of the opening of the pocket 19.

[Effect of idea]

As explained above, according to this invention, the back cover 21 is swingably supported on the inside of the front plate 11 of the front cover 10 via the back cover mounting piece 31, and the back cover 21 is provided with protrusions from the left and right sides of the back cover 21. The sliding shafts 24a, 24b are slidably connected to guide grooves 25a, 25b present on the left and right side surfaces of the pocket 19 on the side of the main body case 1.
The movement of the back cover 21, which is swingably supported on the front cover 10, is regulated by sliding guides between the guide grooves 25a and 25b and the guide grooves 25a and 25b. Therefore, the back cover 21 is connected to the main body case 1 at two points on the left and right as in the past, and basically the back cover 21 does not tilt significantly from side to side, ensuring stable opening and closing operations. There is.

Furthermore, in the present invention, one of the left and right sliding shafts is set as the main sliding shaft 24a and the other as the subordinate sliding shaft 24b, and similarly, one of the left and right guide grooves is set as the main guide groove 25a and the other as the subordinate guide groove 25b. By setting these shapes to be different on the left and right sides, the movement of the back cover 21 is restricted solely by the guided sliding movement of the main sliding shaft 24a with respect to the main guide groove 25a. Then, the subordinate guide groove 2
5b, the subordinate sliding shaft 24b was originally designed to have flexibility so that it could follow the sliding motion with an extra clearance, and these did not actively restrict the movement of the back cover 21. Therefore, unlike the conventional type in which the movement of the back cover 21 is regulated under the same conditions on the left and right sides, even if there is a dimensional error during molding or the warped deformation of the back cover 21 after the product, these deformations and distortions are prevented. can escape and be absorbed by the relationship between the slave sliding shaft 24b and the slave guide groove 25b. As a result, even if the guiding action between the main sliding shaft 24a and the main guide groove 25a is set strictly dimensionally, it is possible to effectively utilize the deformation of the left and right center portions of the back cover 21 inward of the case. The back cover 21 can be smoothly opened and closed while eliminating the forward movement of the lower end of the back cover 21 in the closed state.

[Brief explanation of the drawing]

1 to 6 illustrate a first embodiment of the present invention, and FIGS. 1a and 1b show left and right master and slave sliding shafts 24a and 24b of the back cover 21, which are the constituent members of the present invention.
FIG. 4 is a side view of the main parts showing the relationship between the main guide grooves 25a and 25b on the main body case 1 side. Second
The figure is an external perspective view of the tape cartridge, Figure 3 is a partially cutaway plan view, Figure 4 is a vertical side view of the main part, and Figure 5 is a view of the back cover 21, which is one of the components of the present invention. FIG. 6 is an exploded perspective view of the main parts. FIGS. 7a and 7b are side views of essential parts, respectively, showing another embodiment of the present invention. FIG. 8 is a longitudinal sectional side view of a main part showing poor assembly accuracy in a conventional example. 1... Body case, 2... Tape, 3... Tape reel, 10... Front lid, 11... Front plate of front lid, 12... Connecting piece of front lid, 19... Pocket,
21...Back cover, 22...Pivot, 24a...Main sliding shaft, 24b...Sub-sliding shaft, 25a...Main guide groove,
25b...Subordinate guide groove, 31...Back cover mounting piece.

Claims (1)

[Scope of Claim for Utility Model Registration] A front cover 10 covering the outside of the tape 2 led out to the front of the main case 1 is pivotally connected to the main case 1 so that it can be opened and closed, and is recessed in the front of the main case 1. At the location where the tape loading pocket 19 is located, the front lid 1
A back cover 21 that covers the back side of the tape 2 is pivotally connected to the inside of the front plate 11 of the camera 0 through a back cover mounting piece 31, and a main sliding shaft 24a and a main sliding shaft 24a are provided on the left and right sides of the back cover 21. Follower sliding shaft 2
4b protrudes, and has a main guide groove 25a and a subordinate guide groove 25b on the left and right side surfaces of the pocket 19 on the main body case 1 side, and the main sliding shaft 24a is attached to the main guide groove 25a. The shafts 24b are slidably connected to the slave guide grooves 25b, and the movement of the back cover 21 accompanying the opening/closing operation of the front cover 10 is mainly controlled by the guide sliding of the main sliding shafts 24a with respect to the main guide grooves 25a. A tape cartridge characterized in that the slave sliding shaft 24b is set to follow the slave guide groove 25b and slide with an allowance clearance.