JPS6317082Y2 - - 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 tape reel rotation prevention mechanism, which has a slight tape winding function, has been improved. It is characterized by the following points.

A conventional tape reel rotation prevention mechanism of this type having a tape winding function is disclosed in Japanese Utility Model Publication No. 128287/1987.

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, since there are many components and rotational movements,
Requires large space. Therefore, it is difficult to arrange it for something with a limited size, such as a cassette, and simply shrinking it will not be sufficient 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 having a magnetic tape winding function for a tape cassette which requires a small space and has a small number of components. The feature is that it protects the inside of the cassette from the insertion hole of the reel lock release pin and prevents dirt and dust from entering.

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. Reference numeral 6 denotes a post that stands up on the cassette body 1, and the magnetic tape 19 is transferred to the outside of the cassette by a post (not shown) on the apparatus side 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 locked position, this flexible pawl 10 engages with the teeth 5 of the pair of tape reels and prevents the tape reels 3 and 4 from rotating in the magnetic tape feeding direction.
The tapered shape is designed to improve the strength of the flexible claw 10 and to prevent accidental contact with the magnetic tape 19. 11 is also 1 on the lock member 9.
As shown in FIG.
The lock member 9 is configured to cover an insertion hole 22 provided in the lower half 14 in the movement range of the lock member 9 so that a release pin 21 provided in a device (not shown) for moving the lock member 9 in the cassette body 1 is inserted thereinto. The inside of the cassette body is protected from direct contact with the magnetic tape 19 and the like from the outside. At the same time, it prevents dirt, dust, etc. from entering the cassette body 1 from the outside. 15 and 16 are an upper half 13 and a lower half 1 constituting the cassette main body 1.
4 is the side wall, and 17 is the rear wall of the upper half 13 and lower half 14 as well. In Figure 2, 20 is 1 above.
This 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 similar to the tooth portion 5 provided on the outer periphery of the tape reels 3 and 4 in FIG. When the tape reels 3 and 4 are moved from the engaged state with the flexible claw 10 to the released state of the flexible claw 10 and the tape reels 3 and 4 shown in FIG. The flexible claws 10 are brought into contact with each other, and the flexible claws 10 are forcibly closed, thereby ensuring the separation of the flexible claws 10 from the tape reels 3 and 4. 2
Reference numeral 3 denotes an engaging portion provided in the lock member 9 at a position corresponding to the insertion hole 22 of the release pin 21, and the engaging portion 3 is provided in the direction of movement of the lock member 9 so that the engagement with the release pin 21 can be easily performed. The groove is perpendicular to the groove. Reference numeral 24 denotes a rear wall 17 of the lower half 14 constituting the cassette body 1 of the lock member 9.
This is a positioning hole for the biasing spring 12 provided at a position corresponding to the position. Biasing spring 1 inserted between this positioning hole 24 and the rear wall 17 of the lower half 14
2, the locking member 9 is biased in the direction of arrow b shown in FIG. It can be given to 4. Further, a locking portion 2 is provided on a portion of the rear wall 17 of the lower half 14 that holds the biasing spring 12.
5 is provided. This locking portion 25 receives the force of the biasing spring 12 in common between the lower half 14 and the 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, etc. The best installation position for this locking portion 25 is the entire rear wall 17 of the lower half 14, but
Even just the vicinity of is sufficient. 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. Stepped section 2
As shown in detail in FIG. 7, the stopper portion 27 of the lock member 9 abuts on the lock member 6, and the movement of the lock member 9 is controlled from the position where the stopper portion 27 contacts the stepped portion 26 to the stopper portion 27. The contact position of the lower half 14 with the rear wall 17 is restricted. 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. It is made shorter than the sliding plane auxiliary regulating guide section 8' of the upper half 13 corresponding to the pair of sliding plane regulating guide sections 8 to form a gap α. 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 movement of the lock member 9 from being disturbed and ensures smooth operation of the lock member 9. Furthermore, the distance between the abutting 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 β for the former and γ for the latter. is more spacious. 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', etc., as described above, or due to deformation, etc. This prevents the lock member 9 from being pinched by one surface of the lock member 9.

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, when the cassette is alone (not in use), the pair of flexible pawls 10 of the locking member 9 biased by the spring 12 lock the teeth 5 of the respective pair of tape reels 3 and 4, as shown in the figure. , 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 necessary 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 is guided by the sliding plane auxiliary regulation guide part 8' and the height regulation guide part 28, and moves smoothly in the direction of arrow a against the spring 12 to reach the state shown in FIGS. 4 and 5. Become. At this time, the convex portion provided on the flexible claw 10 comes into contact with the sliding plane regulating guide portion 8 provided on the lower half 14, and the flexible claw 10 is forcibly moved by arrows g and h shown in FIG. Since the flexible claw 10 and the tape reels 3 and 4 are surely separated from each other, the rotation of the tape reels 3 and 4 is not hindered. Further, since only the convex portion 20 provided on the flexible pawl 10 comes into contact with the sliding plane regulating guide portion 8 of the lower half 14, the movement load of the lock member 9 is small, and the lock member 9 can be moved smoothly. Also, a protective plate 11 and a flexible claw 10 provided on the lock member 9
covers the insertion hole 22 of the release pin 21 provided in the lower half 14 even when the lock member 9 is moved, so it protects the inside of the cassette body 1 from the outside of the cassette body 1 and also protects the insertion hole 22 of the release pin 21 provided in the lower half 14. This prevents dirt, dust, etc. from entering from 22. Furthermore, the rear wall 1 of the lower half 14 engages with a spring 12 that increases the repulsion strength due to the movement of the locking member 9.
7 has its locking portion 25 locked to the rear wall 17 of the upper half 13, so that it hardly deforms even under conditions such as temperature changes. Furthermore, the movement range of the locking member 9 is limited by a stepped portion 26 provided in a part of the sliding plane regulating guide portion 8 provided in the lower half 14.
engages with the stopper portion 27 of the locking member 9, so the operating range of the locking member 9 can be restricted only by this sliding plane regulating guide portion 8 alone, making it possible to arrange this reel lock device in a small space. can.

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. Then, as the locking member 9 moves further, the flexible claw 10 locks 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-mentioned configuration and operation, it has the following effects.

(1) In the sliding movement range between the locking position and the release position of the locking member 9 on the tape reels 3 and 4, the protective plate 11 and the flexible claw 10 integrally provided on the locking member 9 are attached to the lower half. Since the insertion hole 22 of the release pin 21 provided in the release pin 14 is always covered, the inside of the cassette body 1 is protected from the outside of the cassette body 1, and at the same time, dirt and dust can be prevented from entering through the insertion hole 22. , the quality of the magnetic tape 19 can be maintained stably for a long time.

(2) The locking member 9 having the flexible claw 10 prevents the tape reels 3 and 4 from rotating in the tape feeding direction, and applies rotational force in the tape winding direction, so that when the cassette is a single unit,
It is possible to hold the tape reels 3 and 4 and absorb slack in the tape 19 at the same time.

(3) Because it has a slack absorption function, magnetic tape19
Damage to the magnetic tape 19 caused by, for example, contact with a post when a cassette is attached to the apparatus can be prevented from being damaged due to slack in the magnetic tape 19.

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

It has the following effects.

[Brief explanation of the drawing]

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 plan view of the main part. 4 is a plan view of the same essential parts showing the state in which the tape reel is released by the locking member, FIG. 5 is a sectional view of the same, and FIG. FIG. 7 is a plan view of essential parts 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 are rotatably housed in a cassette body composed of an upper half and a lower half, and the tape is engaged with the outer periphery of the pair of tape reels to feed out the tape of the pair of tape reels. a pair of flexible claws that prevent rotation in the tape winding direction and apply a rotational force in the winding direction of the tape; one end of the pair of flexible claws is fixed and engaged with a release pin from the device; The flexible plate has an engaging portion provided facing an insertion hole provided in the lower half of the cassette body for mating, and a protective plate for covering the release pin insertion hole provided in the lower half of the cassette main body. a locking member that is slidable between a locking position in which a pawl engages with the tape reel and a release position in which it disengages; and a locking member disposed between the locking member and the rear wall of the lower half of the cassette body; a spring that biases the locking member to the locking position; a sliding plane regulating guide portion provided on the lower half that restricts the sliding range between the locking position and the release position of the locking member; and a sliding plane regulating guide portion provided on the upper half. and a height regulating guide part, and the protection plate of the lock member covers the insertion hole of the release pin provided in the lower half in the sliding movement range between the lock position and the release position of the lock member. Features a tape cassette.