JPS6020214Y2 - magnetic tape cartridge - Google Patents

Description

[Detailed Description of the Invention] This invention is a magnetic tape cartridge in which a front cover for protecting the tape is attached to the front of the main body case, and the front cover closing locking mechanism is improved.

In other words, in a video magnetic tape cartridge,
A front cover for protecting the tape that closes these front covers is pivotally attached to the main body case so that it can be opened and closed, and when not in use, the front cover is locked in a closed position to cover the outside of the front surface of the magnetic tape.

When the magnetic tape is loaded into the video deck, the cover lock is released and the front cover is opened and rotated upward, allowing the magnetic tape to be pulled out to the front of the case.

However, in the conventional front lid closing locking mechanism, a locking tool that engages with the engaged part of the front lid is installed inside the main body case, but this locking tool generally does not move in the left and right width direction inside the main body case. It has a swinging assembly structure, and space must be secured in the left and right width directions of the case to accommodate the movement of the locking tool.

However, the installation position of the locking device is limited to the front of the main body case where it does not interfere with the magnetic tape as much as possible.
In particular, when trying to downsize the main body case, it becomes difficult to secure the above-mentioned space, and it becomes necessary to make unreasonable changes to the placement position of the tape guide member and the shape of each part of the main body case in order to secure the space guide. ing.

Therefore, it has been proposed that the movement of the lock within the main body case is changed from swinging in the left-right width direction of the case to the direction of the thickness of the case, that is, in the vertical direction, thereby ensuring a reasonable installation space for the lock.

One example is shown in FIGS. 1 and 2.

This is to arrange a lid closing locking mechanism 19 between the main tape guide members 5 and 6, which will be described later in FIGS. A projecting piece 66 having an engaging portion 65 is integrally provided,
A projecting piece 67 is provided to protrude from the front edge of the lower end of the main body case 1.

A locking tool 68 made of a leaf spring having a constant width in the front and rear is prepared, and the locking tool 68 is positioned outside the running path of the magnetic tape, and one end thereof is projected as described above in a left-right orientation parallel to the magnetic tape. It is fixed to the piece 67 and the other end engaging portion 69 of the locking tool 68 is vertically swingable so that the other end engaging portion 69 is always engaged with the engaged portion 65 of the front lid 64 in the closed lid position. The structure is designed to encourage

In this case, when not in use, the other end engaging portion 69 of the locking tool 68 fits into the engaged portion 65 of the front lid 64, and the front lid 64 is locked in the closed state, and when loaded into a video deck, the deck is closed. Locking tool 6 is inserted from below the case using operation member 70 on the side.
8 is pushed up and the other end engaging portion 69 of the locking tool 68 is removed upwardly from the engaged hole 65, thereby releasing the lock.

In this conventional structure, since the locking tool 68 is arranged in a left-right orientation, a large installation space is required in the left-right width direction of the main body case 1.

In addition, since the locking tool 68 is located in the middle of the magnetic tape running path, there is a possibility that it may interfere with the magnetic tape.

In particular, since the engaging portion 69 of the locking tool 68 is raised in the unlocked position, there is a high risk that the magnetic tape will come into contact with the locking tool 68 and be damaged when the magnetic tape is pulled forward.

However, when this type of magnetic tape cartridge is loaded into a video deck, it has the flexibility to move slightly in the front-back direction, but the front-to-back width of the locking device 68 cannot be set larger than its position, so the operating member 70 may not come into proper contact with the front-rear center position of the lower surface of the locking tool 68, resulting in uneven contact, or in the worst case, may not come into contact with the lower surface of the locking tool 68.

Focusing on this fact, this invention improves the front lid closing locking mechanism, and first, the locking tool is placed in the main body case in a front-back orientation, and this locking tool can move between the upper and lower locking positions and the unlocking position. The first objective is to create a configuration that can move across the entire width of the case, so that it does not require a large installation space in the left and right width directions of the case.

In addition, the second objective is to prevent the locking tool from interfering with the magnetic tape at all.

Furthermore, a third purpose is to ensure reliable operation by allowing the lock to be released with sufficient margin in terms of design.

The details will be explained below based on the drawings. In Figures 3 to 5, 1 is a plastic upper and lower case la;
The main body case is made by connecting the lb. with screws, fusion, etc. in a lid-like manner.

Tape reels 3, 3, on which the magnetic tape 2 is wound, are rotatably mounted on the left and right sides of the inside of the main body case 1 by positioning them over drive insertion holes formed in the bottom wall 4 of the case. Main tape guide members 5, 6 are arranged at the corners, and the magnetic tape 2 is guided by these guide members 5, 6 and wound onto the tape reel 3 on the right side of the figure.

Each tape reel 3 has flanges 8 and 9 on the upper and lower sides of the hub 7, and engaging teeth 10 are continuously formed on the outer periphery of the lower flange 9. The center of rotation is urged downward by a pressing spring 11.

12 is a pocket into which the tape drawer member a on the video deck side is inserted.

This pocket 12 is located at the center of the front of the main case 1 and extends approximately between the left and right main tape guide members 5 and 6 of the lower case 1.
It is formed by cutting out b into a large groove.

13 is a front cover for protecting the tape.

This front cover 13 includes a front plate 14 that covers the front surface of the main body case 1 across the left and right sides, left and right side pieces 15.15 extending rearward from the left and right ends of the front plate 14, and inner surfaces of each left and right side pieces 15.15. The left and right side pieces 15.15 are fitted onto the front ends of the left and right side walls of the main case 1, and the pivots 16.16 are attached to the main case side. The main body case 1 is fitted into a bearing hole, and is pivotally supported with respect to the main body case 1 so as to be freely rotatable between a closed position and an upwardly open position.

As shown in FIG. 6, a spring member 17 made of a coil spring is fitted to the pivot 16 on the left side of the figure, and one end 17a of the spring member 17 is inserted into the upper case 1a side, and the other end 17b is inserted into the front cover 13 side. The front cover 13 is rotated and biased by the spring member 17 to a closed position in which the front plate 14 covers the outside of the front surface of the magnetic tape 2.

The main case 1 has a closing lock mechanism 19 that maintains the front lid 13 in a closed position when the magnetic tape cartridge is not in use.
It is installed close to the front left wall of the building.

Figures 8 to 11 show an embodiment of this lid closing locking mechanism 19, and first, the engaged piece 20 that goes around inside the front plate 14 and rises from the left side piece 15 of the front M13 is pulled out. , a vertically engaged groove 21 is provided between the engaged piece 20 and the front plate 14, and these engaged parts 20 and the engaged groove 2
1 constitutes an engaged portion 22.

The engaged piece 20 may be extended from the front plate 14.

On the main case 1 side, there is a vertical shaft 23 on the inner surface of the case bottom wall 4.
is set upright, and an opening 24 is provided in the case bottom wall 4 at a position forward of the shaft 23.

This opening 24 may be a notch as shown in the figure, but it may also be a through hole.

Then, the rear end boss portion 26 of the locking tool 25 is fitted to the vertical shaft 23 so as to be movable up and down, the upper end of the vertical shaft 23 is fitted to the receiving tube 27 protruding from the upper case 1a, and the protruding upper part of the vertical shaft 23 is fitted. A coil spring 28 fitted into the boss portion 26 is compressed between the upper surface of the boss portion 26 and the receiving tube 27, and the spring 28 presses down the entire locking tool 25, and in this pressed down state, the locking tool The distal end engaging portion 29 of 25 fits into the engaged groove 21 of the front lid 13 in the closed lid position from above and engages with the engaged piece 20, and also engages with the engaged piece 20 in the lateral direction of the front and rear intermediate portions of the locking tool 25. The pressed portion 30 protruding downwardly fits into the opening 24, and the lower end surface 30a of the pressed portion 30 is flush with the lower surface of the case bottom wall 4 or is slightly inside the case. did.

This pressed part 30 is located on the lateral outer side of the locking tool 25, and when the pressed part 30 corresponds to the inner inner side surface 24a of the opening 24 and the locking tool 25 is raised, the tip engaging part 29 of this is positioned on the vertical axis. It has a structure that can restrict the case from rotating inward around 23, but this inner back side 24
A is not necessarily necessary.

Depending on the structure of the locking tool 25, for example, the locking tool 25
The pressed portion 30 may be directly provided to protrude downward from the lower surface of the front and rear intermediate portions of the pressurized portion 30 and fit into the opening 24 directly below.

In such a case, the locking device 25 is always pressed down to the downward locking position by the compression coil spring 28.
i1 before the tip engaging portion 29 of the locking tool 25 is in the closed lid position
3 from above, and prevents the front M13 from rotating upwardly around the pivot shaft 16 when the magnetic tape cartridge is not in use.

However, when the magnetic tape cartridge is pushed into the video deck and loaded, the operating member 31 on the video deck side is inserted into the locking tool 25 from the lower side of the case bottom wall 4, as shown in FIG.
The entire locking tool 25 is pushed upward to the unlocked position against the compression coil spring 28, and the distal end engaging part 29 of the locking tool 25 is brought into contact with the pressed part 30 of the front lid 13. It is removed from the engaged portion 22 and the lock is released.

Next, as the magnetic tape cartridge is pressed down,
A fixing lever (not shown) on the video deck side comes into contact with the lower end of the front plate 14 of the front cover 13, and the front cover 13 is moved to the spring member 17.
Rotate upward against the

Incidentally, when the front lid 13 is opened, tape drawer members a on the video deck side enter the left and right sides of the pocket 12 from the lower side of the case as shown in FIG. Moving in the direction of the arrow shown, the magnetic tape 2 is wound around the rotary head on the video deck side located in front of the case.

Also, tape guide members b and b on the video deck side are connected to the fourth
As shown in the figure, it also rushes into the left and right positions of the pocket 12 from below the case and moves to the front of the main case 1.
Fast forwarding and fast reversing of the tape from one tape reel 3 to the other tape reel 3 is performed via this tape guide member bb.

In such a case, the aforementioned main tape guide member 5.6 does not provide tape guidance.

Originally, it was difficult to maintain the perpendicularity of the main tape guide members 5 and 6, and there was a disadvantage that the magnetic tape 2 would move up and down during tape feeding, so the tape guide on the video deck side that could ensure the perpendicularity This is because it is advantageous to use members A and B as tape guides.

In addition, lamp insertion holes 34 and 34 are provided in the case bottom wall 4 at positions closer to the inside of the case than the main tape guide members 5 and 6, so that when a magnetic tape cartridge is loaded into the VCR, the lamps on the VCR side are inserted. Each insertion hole 34
The light from the lamp passes through the transparent leader tape connected to both ends of the magnetic tape 2, passes through the transparent holes 35 in the left and right side walls of the main case 1, and reaches the tape end sensor on the video deck side. The starting and ending ends of the magnetic tape 2 are detected.

In connection with this, between the tape reel 3 on the left side and the main tape guide member 6 located in front of it, there is a mechanism to prevent the magnetic tape 2 from coming closer to the center of the case and interfering with the lamp insertion hole 34. Tape guide member 36 for regulating inward deviation
, and the magnetic tape 2 is placed closer to the outer wall of the case than the member 36 to close the cover locking mechanism 19.
A tape guide member 37 for regulating the outer side is arranged so as not to interfere with the tape guide member 37.

Further, reel brake means 39, 39 are assembled at the rear left and right corners of the main body case 1.

As each reel brake means 39, a support shaft 40 is installed vertically on the inner surface of the case bottom wall 4 at the corresponding part, a through hole 41 is bored in the vicinity of the support shaft 40, and the base end of the brake piece 42 is attached to the support shaft 40. The brake pieces 42 are fitted and pivoted automatically from above for horizontal rotation, and each brake piece 42 is pressed and biased by a spring member 43 into a position in which the tip thereof engages with the engagement tooth 10 of each tape reel 3, thereby causing the magnetic tape to Each tape reel 3 is prevented from rotating freely when the cartridge is not used, thereby preventing tape slack from occurring.

When the magnetic tape cartridge is loaded into the video deck, the brake release pin on the video deck side enters the through hole 41 and comes into contact with the middle part of the brake piece 42, causing the brake piece 42 to resist the spring member 43. Then, the tape reels 3 were pushed to the brake release position, and the brakes were released so that each tape reel 3 could freely rotate.

By preventing each tape reel 3 from rotating when not in use, it is unavoidable that tape slack will still occur in the tape running system due to play in the brakes or rattling of each tape reel 3 itself.

Therefore, a tape tensioning means 45 is provided between the right-hand feeding-side tape reel 3 and the main tape guide member 5 located in front of them.

This tape tensioning means 45 is constructed by fitting an intermediate guide member 47 to a separate or integrated vertical shaft 46 erected on the inner surface of the case bottom wall 4 and fixing the intermediate guide member 47 between the upper and lower cases. A bracket 48 that rotates around the shaft 46 is supported, and a tension roller 50 is freely rotatably supported on a shaft 49 provided on the top surface of the tip of the bracket 48. A spring biases it to rotate in one direction.

That is, when the tension roller 50 is positioned on the rear side of the case of the intermediate guide member 47, the magnetic tape 2 is wound around the tension roller 50 and the intermediate guide member 47 in an S-shape in plan view, and the tension roller 50 is It is urged to rotate in the upper clockwise direction C, thereby taking up the slack in the tape.

In this case, the magnetic tape 2 is maintained in a well-tensioned state between the main tape guide members 5 and 6, so that the magnetic tape 2 is loosened to the innermost side of the pocket 12, and the tape pull-out pin a and the tape guide member are connected to the magnetic tape. It is possible to reliably prevent inconveniences such as entering the outside without entering the inside of 2.

In addition, in order to prevent the trouble of incorrectly loading the magnetic tape cartridge into the video deck with the vertical and front-to-back orientations reversed, the lower surface of the case bottom wall 4 is designed so that the magnetic tape cartridge is placed in a direction from the front edge of the left and right center portion that looks into the pocket 12 toward the rear of the case. dent 5
1, and a notch 52 is provided at the lower end of the front plate 14 of the front cover 13, and only when the magnetic tape cartridge is correctly loaded, the incorrect loading prevention piece on the video deck side is inserted into the notch 52 and into the recess 51. It is designed to fit and operate.

Further, at the rear left and right center portions of the main body case 1, there are ribs 54 that butt against each other from the inner surfaces of the upper and lower cases la and lb.
, 54 are provided upright, and a compartment 55 is provided which is separated from the inside of the case by the rib 54. An accidental erasure prevention piece 56 is provided in series on the front side of the case in this compartment 55 in a cantilevered manner so that it can be easily broken off. As shown in the figure, five tape difference identification holes 57 are transparently provided in rows on the left and right on the rear side of the case in the compartment 55.

This identification hole 57 is for selectively identifying the tape length, tape thickness, and tape type such as oxide tape, metal tape, or vapor-deposited tape. As shown, some of the identification holes 57 are closed with a separate piece 58 fixed to the inner upper surface of the case bottom wall 4.

In such a case, when a magnetic tape cartridge is loaded into a video deck, a detection member 59 on the video deck side fits into each identification hole 57, detects whether each identification hole 57 is blocked by a piece 58, and automatically detects the wrong tape. Detect accurately.

As the detection member 59 on the video deck side, we expected a movable switch piece of a micro switch or a limit switch, but it could also be a switch piece of a proximity switch, or an optical element that projects light and receives the reflected light. There are many different types.

Although the entire structure of the illustrated magnetic tape cartridge is as described above, the present invention is not limited thereto.

For example, an engaged groove 21 that has an inverted-shaped engaged piece 20 protruding from the inner surface of the front plate 14 of the front lid 13 and opens downward.
The engaged piece 20 and the engaged groove 21 form an engaged part 22, and the tip engaging part 29 of the locking tool 25 engages the engaged part 22 from below. The locking tool 25 may be pushed upward so as to be biased.

In addition, it is also possible to use a tension spring or a leaf spring as the spring member 28 instead of the compression coil spring shown in the illustrated example.
A tongue-like elastic piece may be integrally provided on the locking device 25 itself so that the elastic piece acts as a spring.

Alternatively, the operating member 31 on the deck side may indirectly act on the pressed portion 30 of the locking tool 25 via a movable member that covers the opening 24.

As explained above, according to this invention, the locking tool 25
is supported in a front-rear posture along one left and right side wall of the main body case 1 so that its distal end engaging portion 29 can move up and down between a set lock position and a lock release position in the vertical direction.

Therefore, the vertical space of the main body case 1 can be used effectively,
Since it does not require much installation space on a flat surface, especially in the left and right width directions, the locking tool 2 can be installed using a small amount of dead space.
5 can be placed easily.

In addition, since the lid locking mechanism 19 is located near the left and right sides of the main body case 1 away from the running path of the magnetic tape 2, the locking device 25 and the like may interfere with the magnetic tape 2 during operation and damage the magnetic tape. There is no possibility of it happening.

Moreover, after the locking tool 25 is arranged in a front-back orientation with respect to the main body case 1, the tip engaging portion 29 of the locking tool 25 is
Since the tip engages with the engaged portion 22 provided on the inside of the front plate 14 of the front cover 13, the tip engaging portion 29 can be easily and securely held against the engaged portion 22 from above and below. separation,
In addition to ensuring reliable operation, the locking tool 2
The contact position of the deck-side operating member 31 against the pressed portion 30 of No. 5 can be arbitrarily set with a sufficient margin in the front-rear direction, which is also advantageous in ensuring reliable operation.

[Brief explanation of drawings]

1 and 2 are perspective views of main parts of a conventional lid closing/locking mechanism. 3 to 11 show a first embodiment of the magnetic tape cartridge according to the present invention, in which FIG. 3 is an overall external perspective view, FIG. 4 is a partially cutaway overall plan view, and FIG. 5 is a partially cutaway overall plan view. is the fourth
6 is a longitudinal sectional view showing how to attach a spring member for urging the front lid to close, which is one of the constituent members of the present invention, and FIG. 7 is a sectional view taken along the line XX in the figure. Y・
-Y line sectional view, FIG. 8 is a perspective view of the main part showing the front cover closing lock mechanism according to the present invention, FIG. 9 is a plan view of the main part, and FIG. 10 is the 2-Z in FIG. 9. A line sectional view, FIG. 11 is a longitudinal sectional side view corresponding to FIG. 10 with the front lid open. 1...Body case, 1a...Upper case, 1b...Lower case, 2...Magnetic tape, 3...Tape reel, 4... Case bottom wall, 5, 6... Main tape guide member, 12
...Pocket for storing tape drawer member, 13.
...Front cover, 14...Front cover front plate, 15
... Left and right side pieces of the front cover, 16... Pivot of the front cover, 17... Spring member for urging the front cover to close, 19... ...Front lid closing lock mechanism, 20
...Engaged piece on the front lid side, 21...Engaged groove on the front lid side, 22...Engaged part on the front lid side, 2
3...Axis, 24...Opening, 25...
...locking tool, 26...boss part of locking tool,
28... Spring member, 29... Engaging portion of the locking tool, 30... Pressed portion of the locking tool, 31...
...Operation member on the deck side.

Claims (1)

[Scope of utility model registration request] A main body case 1 that houses a tape reel 3 on which a magnetic tape 2 is wound has a front cover 1 for protecting the tape that closes the front of the main body case 1.
3, in the magnetic tape cartridge attached so that it can be opened and closed, a secured portion 2 is provided inside the front plate 14 of the front lid 13.
2, and a locking tool 25 that removably engages with the engaged portion 22, and the distal end engaging portion 29 of the locking tool 25 is provided with the locking tool 25 in a front-back posture along one of the left and right side walls of the main body case 1. The lock tool 2 is supported so as to be vertically movable between a lock position where the front lid 13 is engaged with the engaged portion 22 in the closed lid position and an unlock position where the engaging portion 29 is disengaged from the engaging portion 22.
5. It has means for always moving and biasing the entire locking device to the locking position, and the pressed portion 30 of the locking device 25 is directly or indirectly pressed by the operating member 31 on the deck side guided from outside the main body case 1. A magnetic tape cartridge characterized in that the locking tool 25 is pushed to the unlocked position.