JPS6317083Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tape cassette that rotatably stores a reel wound with tape.In particular, the mechanism for preventing rotation of the tape reel, which has a slight tape winding function, has been improved. It has characteristics in points. A conventional tape reel rotation prevention mechanism with a tape winding function of this type was developed in 1985.
-There is one disclosed in Publication No. 128287.

In this method, a lever mounting member is provided at a position equidistant from the two take-up reels and is movable by a pin on the device side between a position in which the take-up reels are not engaged and a braking position in which they are engaged. Two spring-loaded brake levers are provided on both sides of the lever mounting member, and are rotatable and corresponding to the respective take-up reels.
In the braking position of the lever mounting member, the above 2.
Two brake levers act on the outer periphery of each corresponding take-up reel to rotate the take-up reel in the direction to wind up the magnetic tape, and to prevent rotation in the direction to unwind the magnetic tape. do. Further, in the disengaged position, movement of the lever mounting member causes a portion of the brake lever to be disengaged from each of the take-up reels and the brake lever by means of a control surface provided on the cassette body. It is something. However, this method has the following drawbacks.

(1) One lever mounting member has two rotatable brake levers, one of which engages with the take-up reel, and the other disengages; The number of elements (parts) increases.

(2) Furthermore, because there are many components and rotational movements,
It requires a large space. Therefore, it is difficult to place cassettes and other items with size restrictions, and simply shrinking it makes it insufficient in terms of strength.

(3) The disengaged position is achieved by a control surface provided on the rear wall of the cassette body, but this rear wall is a location that is easily deformed due to temperature changes. Therefore, the engagement position between the take-up reel and the brake lever is not stable.

(4) Since the required space is large, it is difficult to utilize the space effectively, for example, by arranging a tape type signal (hole, etc.) in the vicinity.

(5) The large number of components leads to increased costs.

There are drawbacks such as.

The present invention provides a means for locking a tape reel, which has the function of winding up a magnetic tape in a tape cassette, which takes up a small space and has a small number of components. The shape is designed to prevent accidental contact with the device.

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 shows the general overall arrangement, Figs. 2 and 3 show the state of the reel in the locked position, Figs. 4 and 5 show the state of the reel in the released position, and Fig. 6 shows the cross-sectional shape of the locking member. Each movement amount regulation will be explained with reference to FIG.

In FIG. 1, reference numeral 1 denotes a cassette main body, which is composed of an upper half 13 and a lower half 14, a part of which is shown in FIG. Reference numerals 3 and 4 designate a pair of tape reels on which magnetic tape 19 is wound and rotatably held at predetermined positions in the cassette body 1. 5 is the pair of tape reels 3 and 4
The teeth are provided on the outer periphery of the teeth and are symmetrical to each other. A post 6 stands up on the cassette body 1, and the magnetic tape 19 is moved outside the cassette by a moving post (not shown) of the device formed by the front door 2 and the front wall 18 of the cassette body 1. It is stretched over a drawer part 7 for pulling out. Reference numeral 8 designates a pair of sliding plane regulating guide portions that are provided on the lower half 14 constituting the cassette main body 1 and guide the lock member 9. Reference numeral 10 denotes a pair of elastic flexible claws that are integrally provided in the locking member 9 and have a tapered shape. At the lock position, the teeth 5 of the pair of tape reels are
This flexible pawl 1 engages with and prevents the tape reels 3 and 4 from rotating in the magnetic tape feeding direction.
The tapered shape of the flexible claw 10 is designed to improve the strength of the flexible claw 10 and to prevent accidental contact with the magnetic tape 19. Reference numeral 11 denotes a protection plate provided integrally with the lock member 9, and as shown in FIG. 3, a device (not shown) for moving the lock member 9 in the direction of arrow a against the biasing spring 12. It is constructed so that the insertion hole 22 provided in the lower half 14 is substantially covered within the movement range of the locking member 9 so that the release pin 21 provided in the cassette body 1 can be inserted thereinto, and the magnetic tape 19 etc. may be directly touched from the outside of the cassette main body 1. The inside of the cassette body is protected from damage. In addition, the cassette body 1 contains dirt, dust, etc. from the outside.
prevents intrusion. 15 and 16 are the side walls of the upper half 13 and lower half 14 constituting the cassette body 1, and 17 is the rear wall of the upper half 13 and the lower half 14. In FIG. 2, 20 is a convex portion provided at a position facing the pair of guide portions 8 of the pair of flexible claws 10, and this convex portion 20 is a second convex portion.
From the engaged state of the teeth 5 provided on the outer periphery of the tape reels 3 and 4 and the flexible claw 10 shown in the figure to the disengaged state of the tape reels 3 and 4 and the flexible claw 10 shown in FIG. When moved to the position, they come into contact with the guide portions 8 provided on the cassette body 1, forcibly close the flexible claws 10, and ensure separation of the flexible claws 10 from the tape reels 3 and 4. ing. 23 is the release pin 21 of the lock member 9
The engaging portion is provided at a position corresponding to the insertion hole 22, and has a groove shape perpendicular to the direction of movement of the locking member 9 so as to easily engage with the release pin 21. Reference numeral 24 denotes an urging spring 12 provided at a position corresponding to the rear wall 17 of the lower half 14 of the lock member 9 that constitutes the cassette body 1.
This is the positioning hole. The biasing spring 12 inserted between the positioning hole 24 and the rear wall 17 of the lower half 14 biases the locking member 9 in the direction of arrow b shown in FIG. Locks 3 and 4 and rotational force in the winding direction of the magnetic tape 19 can be applied to the tape reels 3 and 4. Further, a locking portion 25 is provided on a portion of the rear wall 17 of the lower half 14 that holds the biasing spring 12. This locking portion 25 is designed to transfer the force of the biasing spring 12 to the lower half 14 and upper half 13 so that the rear wall 17 of the lower half 14 is not deformed by the force of the biasing spring 12 due to temperature changes or the like.
This locking part 25 is installed at the lower half 1.
Although the entire area of the rear wall 17 of No. 4 is best, it is also possible to use only the vicinity of the biasing spring 12. Reference numeral 26 in FIG. 4 denotes a stepped portion serving as a means for regulating the amount of movement of the locking member 9, which is provided in a pair on one part of the pair of guide portions 8 provided on the lower half 14. As shown in detail in FIG. 7, the stopper portion 27 of the locking member 9 is in contact with the step portion 26, and the movement of the locking member 9 is controlled by the step portion 2 of the stopper portion 27.
6 to a position where the stopper portion 27 contacts the rear wall 17 of the lower half 14. Reference numeral 28 shown in FIG. 3 is a height regulating guide portion for regulating the movement of the locking member 9 in the thickness direction, and this height regulating guide portion 28 is provided on the lower half 14 as shown in detail in FIG. 6. The slide plane auxiliary regulation guide part 8' of the upper half 13 corresponding to the pair of sliding plane regulation guide parts 8 is made shorter to form a gap 2. The locking member 9 is also provided near the center of the locking member 9, and the locking member 9 is held between the height regulating guide portion 28 of the upper half 13 and the surface of the lower half 14 due to variations in dimensional tolerances or deformation of each part. This prevents the sliding movement from being obstructed and ensures smooth movement of the locking member 9. Furthermore, the distance between the abutment surfaces of the pair of sliding plane regulating guide parts 8 and sliding plane auxiliary regulating guide parts 8' provided on the upper half 13 and the lower half 14 is set to β of the former as described later. γ is provided wider. This is due to variations in the dimensions of the sliding plane regulating guide section 8 and the sliding plane auxiliary regulating guide section 8' as described above, or due to deformation, etc. This prevents the locking member 9 from being pinched between the two surfaces.

Next, the locked and released states of the tape reels 3 and 4 and the locking member 9 will be explained. First, the lock state will be explained with reference to FIG.

Normally, in a single cassette state (not in use), as shown in the figure, a pair of flexible pawls 10 of a locking member 9 biased by a spring 12 locks the tooth portions 5 of each pair of tape reels 3 and 4. , and prevents the tape reels 3 and 4 from rotating in the magnetic tape feeding direction (arrows c and d). At this time, the flexible claw 10
has a tapered shape, and its tip is connected to tape reels 3 and 4.
Since the width is set to only the width required for engagement with the tooth portion 5 of the flexible claw 10, accidental contact between the flexible claw 10 and the magnetic tape 19 can be prevented, and the tape reel 3
and 4, and sufficient strength to apply rotational force to the tape reels 3 and 4 in the magnetic tape winding direction (arrows e and f).

When such a cassette body 1 is set in a device (not shown), a release pin 21 of the tape reel lock provided in the device is provided on the lower half 14 of the cassette body 1 as shown in FIG. It enters through the hole 22 and is inserted into the engaging portion 23 of the locking member 9. At this time, since the engaging portion 23 has a notched groove shape, the release pin 21 can be inserted smoothly. In order to unlock the tape reels 3 and 4 from this state, release pin 21 from the device is released.
When the locking member 9 is moved in the direction of the arrow a shown in FIG. 8, and moves in the direction of arrow a against the spring 12 by a smooth movement guided by the sliding plane auxiliary regulation guide part 8' and the height regulation guide part 28, and reaches the state shown in FIGS. 4 and 5. Become. At this time, the convex portion 2 provided on the flexible claw 10
0 comes into contact with the sliding plane regulating guide section 8 provided on the lower half 14, forcing the flexible claw 10 to move to the fourth position.
Since the flexible claw 10 and the tape reels 3 and 4 are closed in the directions of arrows g and h shown in the figure, the flexible claws 10 and the tape reels 3 and 4 are reliably spaced apart from each other, and the rotation of the tape reels 3 and 4 is not hindered. Furthermore, a convex portion 2 provided on the flexible claw 10
Only 0 is the sliding plane regulating guide part 8 of the lower half 14
Since the lock member 9 comes into contact with the lock member 9, the movement load of the lock member 9 is small and the lock member 9 moves smoothly. Further, the protective plate 11 provided on the locking member 9 is inserted into the insertion hole 22 of the release pin 21 provided on the lower half 14.
Since the locking member 9 covers the inside of the cassette body 1 even when it is moved, the inside of the cassette body 1 is protected from the outside of the cassette body 1, and dirt and dust are prevented from entering through the insertion hole 22. Furthermore, the spring 1 increases the repulsion strength by the movement of the locking member 9.
The rear wall 17 of the lower half 14 that is engaged with one of the lower halves 13 is hardly deformed even under conditions such as temperature changes because its engagement portion 25 is engaged with the rear wall 17 of the upper half 13. . Furthermore, the movement range of the locking member 9 is limited by the step portion 26 provided on a part of the sliding surface regulating guide portion 8 provided on the lower half 14 engaging with the stopper portion 27 of the locking member 9. The operating range of the locking member 9 can be restricted only by the plane regulating guide section 8 alone, and this reel locking device can be placed in a small space.

Next, with the tape reels 3 and 4 unlocked, the magnetic tape 19 is transferred from the cassette main body 1.
The tape reels 3 and 4 after being pulled out to a predetermined position of the device and subjected to operations such as recording and playback.
Explain the lock.

When the release pin 21 moves in the direction of arrow b from the state shown in FIG. It follows the movement of the pin 21 and begins to move in the direction of arrow b. At this time, the flexible pawl 10 of the locking member 9 has a convex portion 20 provided on the flexible pawl 10 that is successively separated from the sliding plane regulating guide portion 8 provided on the lower half 14, as shown in FIG. It moves while opening in the directions of arrows i and j, and first engages with the teeth 5 of the tape reels 3 and 4 to prevent the tape reels 3 and 4 from rotating in the direction in which the magnetic tape is fed out. In order to further move the locking member 9, the flexible pawl 10 is attached to the tape reels 3 and 4.
The tape reels 3 and 4 are rotated in the magnetic tape winding direction as shown by arrows k and l while still being engaged with the teeth 5 of the magnetic tape 19 stretched on the cassette body 1. absorb the slack.

Then, when the release pin 21 comes to the predetermined position, the stopper part 27 formed in one part of the lock member 9 comes into contact with the stepped part 26 of the sliding plane regulating guide part 8 provided on the lower half 14, and It stops the operation.

Since the present invention has the above-described configuration, it has the following effects.

(1) The locking member 9 side (base side) of the flexible claw 10 is wider, and the side that engages with the tape reels 3 and 4 has the minimum width necessary for engagement, so the strength of this flexible claw is The tape reel 3 locks the tape reel and applies rotational force in the magnetic tape winding direction.
and 4.

(2) Since this flexible claw 10 has a tapered shape and has no unnecessary corners or surfaces, even if the magnetic tape 9 becomes abnormally slack due to unexpected movement, this flexible claw 1
0 and the magnetic tape 19 is small, and there is little chance of damage.

(3) The flexible pawl 10 integrally provided on the lock member 9 biased by the spring 12 prevents the tape reels 3 and 4 from rotating in the magnetic tape feeding direction and in the magnetic tape winding direction. By applying rotational force, it is possible to simultaneously hold the tape reels 3 and 4 and absorb the slack of the magnetic tape 19 when the cassette is a standalone unit. Damage to the magnetic tape 19 due to contact between the magnetic tape 19 and the post on the apparatus side, which is caused by slack in the magnetic tape 19, can be prevented.

(4) Since the number of parts is small and there are no rotating parts, it can be constructed at low cost and in a small space, so that the space of the cassette body 1 can be used effectively.

It has the following effects.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway schematic plan view of a tape cassette according to an embodiment of the present invention, Fig. 2 is a plan view of the main part showing the state in which the tape reel is locked by the locking member, and Fig. 3 is a sectional view of the main part. Figure 4 is a plan view of the same essential parts showing a state in which the tape reel is released by the locking member, Figure 5 is a sectional view of the same, and Figure 6 is a guide section provided on the lower half and upper half forming the cassette body. FIG. 7 is a sectional view showing the structure of the cassette body, and FIG. 7 is a plan view of the main part showing the relationship between the sliding plane regulating guide section provided on the lower half forming the cassette body and the lock member. DESCRIPTION OF SYMBOLS 1...Cassette body, 3, 4...Tape reel, 8...Sliding plane regulation guide, 9...Lock member, 10...Flexible claw, 12...Spring, 17...Rear wall, 20... Convex portion, 21...Release pin, 23...
Engagement part, 25...Locking part, 26...Step part, 27...
...stopper, 28...height regulation guide section.

Claims (1)

[Scope of utility model registration request] A pair of tape reels rotatably housed in a cassette body formed by an upper half and a lower half, and engaging the outer periphery of the pair of tape reels,
a pair of tapered flexible claws provided to prevent the pair of tape reels from rotating in the tape feeding direction and to impart rotational force in the tape winding direction; The other ends of the pair of flexible claws are fixed, and an engaging portion is provided facing the insertion hole provided in the lower half so as to engage with a release pin provided on the device. a locking member that slides between a locking position in which a flexible pawl engages with the tape reel and a release position in which it disengages;
A spring located between the lock member and the rear wall of the lower half that urges the lock member toward the lock position, and a lower half that restricts the sliding range of the lock member between the lock position and the release position. A tape cassette comprising a sliding plane regulating guide section provided on the upper half and a height regulating guide section provided on the upper half.