JP3630927B2 - Single reel type magnetic tape cartridge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a single reel type magnetic tape cartridge in which only one reel for winding a tape is accommodated inside a case body.
[0002]
[Prior art]
In this kind of tape cartridge, there is a tape cartridge in which a leader block made of a plastic molded product is connected to a feeding end of the tape (Japanese Patent Laid-Open No. 62-66486). When not in use, the leader block is press-fitted and held in a shallow pocket facing the loading opening. In such a tape cartridge, since most of the leader block protrudes into the loading pocket, even if there is some variation in the standby posture, the leader block can be reliably captured and pulled out of the case. On the other hand, since the loading opening is always open, dust or the like easily enters the case through the loading opening.
[0003]
Thus, as shown in FIG. 6, there is a magnetic tape cartridge in which the loading opening 40 is narrowed and a leader block 41 is press-fitted to the edge of the opening so that the loading opening 40 can be closed by the leader block 41 (unknown literature). In the figure, reference numeral 42 denotes a reel, 43 denotes a tape, and 44 denotes a clamp pin for connecting the tape 43 to the leader block 41.
[0004]
[Problems to be solved by the invention]
When the loading opening 40 is closed by the leader block 41 in this way, dust can be prevented from entering from the loading opening 40, but the leader block 41 itself is exposed to the outer surface of the case, so that dust is likely to adhere to the exposed surface. Dust adhering to the leader block 41 is drawn into the tape drive during tape loading and adheres to the magnetic head, which may increase errors. Further, the leader block 41 is merely engaged and held with a relatively weak force by utilizing the elasticity of the case main body 45. Therefore, the leader block 41 is mistakenly placed inside the case when handling the tape cartridge. You may push in In the leader block 41 in such a misaligned state, it may not be able to be properly captured by the loading mechanism.
[0005]
The conventional tape cartridge provided with a leader block at the end of the tape has room for improvement in that the ease of loading operation of the leader block and the dust resistance cannot be satisfied at the same time. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a single reel type magnetic tape cartridge capable of avoiding adhesion of dust to the leader block as much as possible while maintaining ease of loading operation of the leader block.
[0006]
[Means for Solving the Problems]
In the magnetic tape cartridge of the present invention, a reel 2 around which a tape 3 is wound is disposed inside a box-shaped case body 1, and a leader block 4 is connected to a feeding end of the tape 3. The leader block 4 is formed by integrally molding a base portion 25 connected to the tape end and a hooking portion 26 captured by a loading mechanism of the tape drive. Facing the peripheral side surface of the case body 1, a loading opening 5 that allows the loading mechanism to enter is provided in an indented shape. At the inner opening edge of the loading opening 5, a projecting piece 6 is provided to hold the base portion 25 and fix and support the leader block 4 in a cantilever standby posture. A lid 7 for closing the loading opening 5 is provided on the case outer surface side from the leader block 4, and the lid 7 is supported on the case body 1 so as to be openable and closable.
[0007]
Specifically, at the front corner of the case body 1, the case bottom wall 20, the case front wall 21, and the case side wall 22 are cut out to form the loading opening 5. A pair of projecting pieces 6 that sandwich and hold the leader block 4 is provided at the cutout edge of the case bottom wall 20. The lid 7 is formed in an L-shaped cross section with a lid side wall 7 a and a lid front wall 7 b that cover the loading opening 5 continuously to the case side wall 22 and the case front wall 21. By supporting the rear end of the lid side wall 7a with a pin 32, the lid 7 is supported on the case body 1 so as to be swingable. A lid lock 33 that holds the lid 7 in the closed position is provided between the lid 7 and the case body 1.
[0008]
[Action]
The leader block 4 is fixedly supported by the projecting piece 6 provided on the inner opening edge of the loading opening 5 and the loading opening 5 is covered with the lid 7 on the outer surface side thereof, so that the leader block 4 is exposed to the outer surface of the case when not in use. It is possible to prevent dust and the like from adhering to the leader block 4. The reader block 4 is not touched by mistake. The leader block 4 fixedly held in the standby posture by the projecting piece 6 is supported in a cantilevered manner, and its latching portion 26 projects into the loading opening 5. Therefore, the lid 7 is opened to operate the loading opening 5. When is opened, the latching portion 26 can be reliably and easily captured by the loading mechanism.
[0009]
【Example】
1 to 5 show an embodiment of a single reel type magnetic tape cartridge according to the present invention. In FIG. 2, the magnetic tape cartridge has a rectangular box-shaped case body 1 formed by joining upper and lower cases 1 a and 1 b, and a single reel 2 is accommodated inside the case body 1. 3 is wound. A leader block 4 for pulling out the tape 3 is fixed to the feeding end of the tape 3. The leader block 4 is arranged so as to face a loading opening 5 opened at the front left corner of the case body 1, and the loading opening 5 can be opened and closed by a swingable lid 7.
[0010]
As shown in FIG. 3, the boss 9 of the reel 2 is opened upward, and a drive ring 10 for transmitting the rotational force of the drive body of the tape drive to the reel 2, a reel presser 11, and a reel presser 11 are disposed therein. A spring 12 that urges and pushes down is accommodated. The drive ring 10 is received by a seat portion 13 provided on the inner bottom of the boss 9 and can be slid up and down with respect to the seat portion 13 but is supported so as not to be relatively rotated. An iron plate suction plate 14 that is magnetically attracted by the driving body is fixed to the lower surface of the seat portion 13. The previous driving body is brought into pressure contact with the joint surface at the bottom end of the drive ring 10 in a surface-joined manner, and drives the drive ring 10 to rotate.
[0011]
In order to prevent tape slack when not in use, a reel lock mechanism is arranged using the space at the front right corner of the case body 1 as shown in FIG. The reel lock mechanism includes a lock claw 16 that swings about a pin 15, a torsion coil spring 17 that urges the lock claw 16 toward the reel 2, and a lower flange of the reel 2. It consists of gear teeth-like lock teeth 18 provided on the periphery. A release piece 19 projects from the lower surface of the midway portion of the lock claw 16. As shown in FIG. 4, by operating the groove 19a provided in the release piece 19 with the release pin P inserted from the lower surface side of the lower case 1b, the entire lock claw 16 is counterclockwise against the urging force of the spring 17. The locked state can be released by swinging in the rotational direction.
[0012]
In FIG. 1, the loading opening 5 is formed by notching the front left corner of the case bottom wall 20 of the case body 1 obliquely, and further cutting the case front wall 21 and the case side wall 22 between the notch ends. The case upper wall 23 covers the upper surface side of the loading opening 5 without being cut out. A pair of front and rear projecting pieces 6 and 6 for holding the leader block 4 are provided on the upper surface of the middle part of the case bottom wall 20. Most of the projecting pieces 6 protrude from the case bottom wall 20 and can be elastically deformed in directions toward or away from each other.
[0013]
In FIG. 5, the leader block 4 is made of a plastic molded product having a flat top and bottom surface, which is integrally formed with a trapezoidal base portion 25 and a hook-shaped hook portion 26. The clamp pin 28 and the tape 3 are press-fitted into the groove 27 to connect the tape 3. On the circumferential surface on the groove 27 side, there is provided a recess 29 that engages with the tip of the front protruding piece 6. The rear protrusion 6 receives the flat surface on the rear surface side of the base portion 25. In other words, the leader block 4 when not in use is sandwiched and held by a pair of front and rear projecting pieces 6 and 6, and is fixedly supported in a cantilevered standby posture in which the latching portion 26 protrudes to the approximate center of the loading opening 5. Yes.
[0014]
In order to protect the leader block 4, the tape 3, etc. facing the loading opening 5, a lid 7 is provided for closing the loading opening 5 on the case outer surface side from the leader block 4. In FIG. 5, the lid 7 has a lid side wall 7a that bends in an L shape and a lid front wall 7b, and a cylindrical boss 31 provided at the rear end of the lid side wall 7a is pivotally supported by a pin 32. A reciprocation between a position where the loading opening 5 is closed with respect to the case body 1 (state shown in FIG. 2) and a position where the loading opening 5 is opened by swinging clockwise from this position (state shown in FIG. 1). Can swing. The pin 32 is erected integrally with the lower case 1b, is inserted through the boss 31, and is received by the upper case 1a.
[0015]
In order to lock and hold the lid 7 in the closed position, a lid lock 33 is provided between the lid 7 and the case body 1. The lid lock 33 protrudes near the lower end of the inner surface of the front end of the lid front wall 7b, and the claw portion 34 of the protruding end engages with a shallow engagement recess 35 provided on the inner surface of the case front wall 21, The lid 7 can be kept closed. When the lid 7 is opened and swung against the elasticity of the lid lock 33, the engagement state between the claw portion 34 and the engagement recess 35 can be released. If necessary, the engagement recess 35 can be formed in a hole that penetrates the case front wall 21 and the engagement state of the claw portion 34 can be released with a release pin that enters the engagement recess 35 from the outer surface of the case. it can.
[0016]
When the magnetic tape cartridge is not in use, the leader block 4 is held between the pair of projecting pieces 6 to maintain a standby posture as shown in FIG. Furthermore, the loading opening 5 is closed by the lid 7, and only the lower surface side is opened. Therefore, it is possible to well prevent dust from adhering to the leader block 4 when handling or storing the tape cartridge. Furthermore, the holding posture by the projecting piece 6 does not change by accidentally touching the leader block 4. When the lid 7 is opened by the loading operation to the tape drive, the latching portion 26 of the leader block 4 can be exposed to the approximate center of the loading opening 5, so that the latching portion 26 can be reliably captured by the loading mechanism. Easy to do.
[0017]
In addition to the above embodiment, the loading opening 5 can be formed so as to face either the case front wall 21 or the case side wall 22 of the case body 1. In this case, the lid 7 can be formed in a flat plate shape. Further, the lid 7 formed in a flat plate shape may be supported by the case body 1 so as to be slidable. By using the case side wall 22 or the case front wall 21 as a positioning wall, the leader block 4 can be sandwiched and held in a standby posture. In this case, only one protruding piece 6 is provided.
[0018]
【The invention's effect】
In the present invention, the loading opening 5 is provided in an indented shape facing the peripheral side surface of the case body 1, and the leader block 4 is held on standby by the projecting piece 6 provided at the inner opening edge. Furthermore, the loading opening 5 is covered with a lid 7 positioned on the outer surface side of the case from the leader block 4 so that the leader block 4 is not exposed to the surface of the case when not in use. It is possible to eliminate the adhesion of dust and the like. Therefore, it is possible to reduce the degree of error occurrence at the time of signal reading / writing due to the dust adhering to the leader block 4 being transferred to the magnetic head. At the time of use, the loading opening 5 is opened by opening the lid 7, and the latching portion 26 of the leader block 4 can be exposed sufficiently facing the outer surface of the case, so that the loading mechanism cannot easily catch the latching portion 26. As a whole, it is possible to satisfy both dustproofness and ease of loading operation of the leader block 4 at the same time.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a peripheral structure of a loading opening.
FIG. 2 is a plan view of the entire interior.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along line BB in FIG.
FIG. 5 is an internal plan view showing a peripheral structure of a loading opening.
FIG. 6 is an internal plan view showing a standby state of a conventional leader block.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case main body 2 Reel 3 Tape 4 Leader block 5 Loading opening 6 Projection piece 7 Lid 25 Base 26 Latch part

Claims (1)

A magnetic tape cartridge in which a reel 2 around which a tape 3 is wound is arranged inside a box-shaped case main body 1 and a leader block 4 is connected to a feeding end of the tape 3,
The leader block 4 is formed by integrally molding a base portion 25 connected to the tape end and a latching portion 26 captured by a loading mechanism of the tape drive,
In the front corner of the case body 1 , the case bottom wall 20, the case front wall 21, and the case side wall 22 are notched, and a loading opening 5 that allows the loading mechanism to enter is provided in an indented shape.
The cut edge of the case bottom wall 20, the holding clamp the base portion 25, a pair of projecting pieces 6 collision which hook portion 26 is fixedly supported to the standby position of the cantilevered projecting the loading opening 5 the leader block 4 Has been established,
A lid 7 for closing the loading opening 5 on the case outer surface side of the leader block 4 ;
The lid 7 is formed in an L-shaped cross section with a lid side wall 7a and a lid front wall 7b covering the loading opening 5 continuously to the case side wall 22 and the case front wall 21,
By supporting the rear end of the lid side wall 7a with a pin 32, the lid 7 is supported on the case body 1 so as to be swingable and openable.
Between the cover 7 and the case body 1, a single reel type magnetic tape cartridge lid lock 33 is held in position closing the lid 7 is al provided.

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