JPH11238351A - Single reel type magnetic tape cartridge - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a single reel type magnetic tape cartridge having a reel lock mechanism provided between an inner bottom of a reel boss and an upper case, when a lock is released, the reel presser tilts and the lock is released. Eliminates incompleteness. SOLUTION: A lock release member 18 and a reel presser 16 are provided between an inner bottom of a boss 12 of a reel 2 and an upper case 1a.
And the spring 17 are arranged. The reel presser 16 is vertically slidable but non-rotatably held by a guide projection 15 provided on the upper case 1a. Lock teeth 19 and 2 engaging with each other are provided on the inner bottom surface of the boss 12 and the surface facing the reel presser 16.
0 is provided. The lock release tool 18 has three leg pieces 27. Each leg piece 27 has an opening 3 provided in the bottom wall of the boss 12.
0, and project from the lower surface of the reel 2. Since the unlocking tool 18 is pushed up via the three leg pieces 27, the reel presser 16 can be prevented from tilting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-reel type magnetic tape cartridge represented by a magnetic recording medium of a data recorder for a computer, and has an improved reel lock mechanism.

[0002]

2. Description of the Related Art Some magnetic tape cartridges of this type have a reel lock mechanism of the type shown in FIG. There, the upper flange 50 and the lower flange 5
A reel 53 is formed by a cylindrical boss 52 integrally formed with the lower flange 51 and the lower flange 51. A reel presser 54 disposed inside the boss 52 prevents the reel 53 from rotating freely when not in use. . In the center of the lower surface of the inner bottom wall of the boss 52, an iron plate 5 magnetically attracted by a drive shaft on the tape drive side is provided.
5 is fixed, and an engaging portion 56 is provided on a peripheral wall thereof for receiving the rotational force of the drive shaft. The engaging portion 56 is constituted by a group of uneven bodies.

[0003] The reel presser 54 has a spring 5 of a compression coil type.
7 has a circular seat plate 58 for receiving the lower end thereof.
A slide boss 59 and a passive pin 60 are provided above and below the center of the boss. The slide boss 59 is guided by a guide protrusion 63 provided on the upper wall of the case so as to be vertically slidable but not rotatable. Also, the lower surface of the seat plate 58 and the boss 52
Lock teeth 62 are provided on the upper surface of the receiving seat 61 protruding from the inner bottom of the bracket. Therefore, the lock teeth 62
In a state where the members are joined, the reel 53 cannot rotate. In use, the passive pin 60 exposed on the lower surface of the central portion of the reel 53 is pushed up by the drive unit of the tape drive to release the engagement between the lock teeth 62. At the same time, the reel 53 is attracted by the driving body via the iron plate 55, and the rotational force is transmitted to the reel 53 via the engaging portion 56.

[0004]

In the above-mentioned tape cartridge, the passive pin 60 is pushed up against the spring 57, and the reel presser 54 is lifted off the seat 61, thereby switching the reel 53 to a rotatable state. . At the same time, the iron plate 55 is magnetically attracted by the drive shaft, and the engaging portion 56 is closely joined to the engaging teeth on the drive shaft side. Thus, the passive pin 60 provided at the center of the lower surface of the reel presser 54 is pushed up,
In a structure in which the contact state between the lock teeth 62 is released, the locked state may not be released reliably. In a state where the reel presser 54 is separated upward from the receiving seat 61, the whole of the reel presser 54 is inclined, and the lock teeth 62 on the seat plate 58 side and the lock teeth 62 on the receiving seat 31 contact at the inclined lower end side. This is because the engagement may occur, and in such a case, the drive shaft idles and the reel 53 cannot be reliably driven to rotate. If the unlocking of the reel 53 is not sufficient, abnormal tension acts on the magnetic tape, and a serious accident such as tape cutting may occur. Lock teeth may be lost or abnormally worn, making it impossible to reliably lock the reel.

[0005] It is an object of the present invention to reliably switch the reel lock mechanism to the unlocked state at all times, to prevent the magnetic tape from being pulled out of the case while the reel is in the locked state. The purpose of the present invention is to improve the reliability by eliminating the occurrence of serious accidents such as cutting of the tape or breakage of the tape puller and the lock teeth.

Another object of the present invention is to provide a lock releasing member for releasing the reel locked state between the reel presser and the reel which come into contact with each other in the reel locked state. An object of the present invention is to provide a single-reel type magnetic tape cartridge in which a lock member can be reliably unlocked by pushing up a tool against a spring.

[0007]

As shown in FIG. 2, the magnetic tape cartridge of the present invention comprises a box-shaped case body 1 and a single reel 2 on which a magnetic tape 3 is wound. A reel lock mechanism is provided between the inner bottom of the boss 12 provided at the center of the reel 2 and the upper wall of the case body 1 to prevent the reel 2 from rotating freely when not in use. As shown in FIGS. 1 and 3, the reel lock mechanism is slidable up and down by a guide projection 15 protruding from the inner surface of the upper wall of the case body 1, but is not rotatable relative to the reel presser 16 which is engaged and guided. A spring 17 for pressing down and pressing the reel presser 16, and an unlocking tool 18 disposed between the reel presser 16 and the bottom wall of the boss 12. Reel presser 1
6 and a lock tooth 19 that contacts and engages with the lower surface of the boss 12 and the upper surface of the bottom wall of the boss 12 to prevent rotation of the reel 2.
20 are provided. The lock release tool 18 is provided with a main surface wall 25 that is received on the upper surface of the bottom wall of the boss 12 and a protrusion 2 that protrudes from the upper surface of the main surface wall 25 to push up the reel presser 16.
8 and a plurality of leg pieces 27 protruding below the lower surface of the main surface wall 25. Each leg 27 protrudes from the lower surface of the reel 2 via an opening 30 provided in the bottom wall of the boss 12.

More specifically, as shown in FIGS. 3 to 5, drive teeth 14 for receiving the rotational power of the drive shaft D of the tape drive are provided in a circular shape on the lower surface of the bottom wall of the boss 12, and the drive teeth 14 are formed. At least several driving teeth 14
Is formed to reach the bottom surface of the reel 2, and each leg 27 is projected toward the lower surface side of the reel 2 through the opening 30 provided in the missing tooth portion 31.

As shown in FIG. 3, the unlocking member 18 includes a main surface wall 25 and a projection 28 protruding from a central upper surface of the main surface wall 25.
And a leg 27 bent downward from the tip of the peripheral edge 26 of the main surface wall 25 are formed by a press-formed product made of a metal plate integrally formed. As shown in FIG. 7, the leg piece 27 is formed by bending outwardly in a radially outward direction of the reel 2.

[0010]

When not in use, the reel 2 is engaged with the reel presser 16 which is pushed down by the spring 17 via the locking teeth 19 and 20 as shown in FIG. Have been. The unlocking tool 18 has its leg 27 projecting from the lower surface of the reel 2 through the opening 30. When the leg 27 in this state is pushed up by the drive shaft D of the tape drive, the reel presser 16 is pushed up against the spring 17 as shown in FIG.
9 and 20 are separated from each other, and the reel locked state is released. At this time, since the leg pieces 27 are provided at a plurality of locations,
The lock releasing tool 18 that has been pushed up can be reliably prevented from tilting in any of the radial directions, and the reel presser 16 is reliably moved upward by an amount corresponding to the lifting of the lock releasing tool 18, and the lock teeth 19 and 20 are locked. Ensure withdrawal.

Missing tooth portion 31 provided in the area where drive teeth 14 are formed
When the leg piece 27 is protruded from the opening 30 to the lower surface of the reel, the unlocking tool 18 can be pushed upward at a position radially outwardly from the center of the reel, so that the lock is released when the lock is released. The tool 18 can be more reliably prevented from tilting. Further, since the toothless portion 31 reaching the bottom surface of the drive tooth 14 is provided and the opening 30 is provided therein, the drive tooth 14 is divided by providing the opening 30, and the drive tooth 14 in the portion where the opening 30 is formed is provided. Is reduced, and it is possible to prevent the chip from being easily broken. The structure of a mold for forming the reel 2 can be simplified, and the drive teeth 14 can be formed easily.

The unlocking member 18 is formed as a press-formed product made of a metal plate having three leg pieces 27, so that the unlocking member 18 at the time of the unlocking operation is pushed up in a stable state without tilting. Can operate. In particular, when the leg 27 protrudes from the toothless portion 31 provided in the area where the drive teeth 14 are formed, the protruding end surface of the leg 27 is pushed up by the tip of the drive tooth on the drive shaft D side. Therefore, the tilting of the unlocking tool 18 at the time of pushing up can be prevented more reliably than when only two leg pieces 27 are provided. As shown in FIG. 7, the lock release tool 18 in which the leg piece 27 is bent in an outwardly convex shape,
By increasing the buckling strength and bending strength of the leg 27, it is possible to prevent the leg 27 from being bent when the leg 27 is pushed up by the drive shaft D. When the strength of the leg piece 27 is kept constant, its thickness can be reduced.

[0013]

1 to 6 show an embodiment of a single reel type magnetic tape cartridge according to the present invention. In FIG. 2, the magnetic tape cartridge accommodates a single reel 2 in a rectangular box-shaped case main body 1 in which upper and lower cases 1a and 1b are joined together with a lid, and a magnetic tape 3 (hereinafter simply referred to as a tape) is mounted on the reel 2. Is called). A loading pin 4 for pulling out the tape 3 is connected to the feeding end of the tape 3. The loading pin 4 is housed inside a tape outlet 5 opened at the front right corner of the case body 1, and upper and lower ends thereof are engaged by holders 6, 6 provided on the inner surfaces of the upper case 1a and the lower case 1b. It is held and positioned. The tape outlet 5 can be opened and closed by a lid 7 which can be freely opened and closed.

As shown in FIG. 1, the reel 2 comprises an upper flange 10 and a lower flange 11, and a boss 12 formed integrally with the lower flange 11 and opening upward. The inner bottom of the boss 12 and the case body 1 Upper wall, upper case 1
and a reel lock mechanism for preventing the reel 2 from floating when not in use. The upper flange 10 is non-separably welded and fixed to the upper end of the boss 12. Boss 1
A circular suction plate 13 is welded and fixed to the center of the lower surface of the bottom wall of the second 2, and drive teeth 14 are protruded in a circular shape so as to surround the periphery of the suction plate 13 (see FIG. 5). The attraction plate 13 is formed of a magnetically attractable metal plate such as an iron plate or a steel plate. The drive teeth 14 are formed as a group of gear blades extending in the radial direction and having a saw-tooth cross section, and are engaged with the drive teeth provided on the shaft end surface of the drive shaft D (see FIG. 6) of the tape drive to drive the drive shaft. Inherits the torque of D. The drive teeth 14 are exposed on the outer surface of the case via the drive holes 8 provided in the bottom wall of the lower case 1b.

Referring to FIGS. 1 and 3, the reel lock mechanism includes a reel presser 16 which can be slid up and down by a guide projection 15 provided on the inner surface of the upper case 1a but cannot rotate relative to the reel presser. 16 and upper case 1a
, And a lock release tool 18 disposed between the reel retainer 16 and the upper surface of the bottom wall of the boss 12. Lock teeth 19 and 20 are provided on the bottom wall of the boss 12 and the lower surface of the reel retainer 16 in a circumferential shape so as to abut against each other and prevent the reel 2 from rotating.

The reel retainer 16 is made of a round plate-shaped plastic molded product that is open upward, and has four L-shaped ribs 22 protruding at the center of the inner upper surface thereof.
2 defines a cross-shaped slide groove 23. A guide projection 15 having a cross-shaped cross section provided on the upper case 1a is engaged with the slide groove 23, and the reel presser 16 is guided only vertically. The guide projections 15 also serve to regulate the tilting of the reel presser 16 when sliding vertically. In the center of the lower surface of the bottom wall of the reel presser 16,
As shown in FIG. 1, a partially spherical concave portion 24 which is received by the unlocking tool 18 is provided, and a group of lock teeth 20 is provided around the concave portion 24 in a protruding manner. Lock teeth 20
Consists of teeth having a chevron cross-section extending in the radial direction. Note that the spring 17 is mounted so as to be fitted to the guide projection 15 outside,
The displacement in the radial direction is restricted.

The unlocking tool 18 is made of a press-formed product made of a steel plate such as a stainless steel plate. The three arms 26 are radially extended from the peripheral edge of the circular main surface wall 25 at equal intervals. A leg 27 that bends downward is integrally formed at the tip of the head. In the center of the main surface wall 25, there is a reel presser 1
6 into the recessed portion 24, and a partially spherical projection 28 for pushing up the reel presser 16 is formed to bulge upward. As described above, the reel retainer 16 and the unlocking tool 18 are brought into contact with each other through the partially spherical concave portion 24 and the projection 28 because the unlocking tool 18 pushes up the reel presser 16 against the spring 17. This is to prevent the centers of the two 16 and 18 from shifting, and to minimize the frictional resistance between the projection 28 and the recess 24 when the reel 2 is driven to rotate. The spherical radius of the concave portion 24 is the protrusion 2
8 larger than the spherical radius.

As described above, the unlocking tool 18 has its main surface wall 25 received and supported by the inner bottom surface of the boss 12. In this receiving state, in order to prevent each arm 26 from contacting and interfering with the lock teeth 19 on the boss 12 side, FIG.
As shown in (1), the annular row of the lock teeth 19 is divided at three positions in the circumferential direction, and each arm 26 is received by the divided portion 19a. In order to make the leg 27 provided at the tip of each arm 26 protrude from the lower surface of the reel 2, 3
Openings 30 are provided.

Driving teeth 14 provided on the lower surface of the bottom wall of boss 12
Engages with the drive shaft D of the tape drive and inherits the rotational force. In order to push up the unlocking tool 18 using this engagement operation, the opening 30 is formed in the area where the drive teeth 14 are formed, and the leg 27 protrudes toward the lower surface of the reel. By providing the opening 30, the strength of the driving teeth 14 intersecting with the opening 30 is reduced, the driving teeth 14 are easily broken, and the structure of the molding die is complicated. In order to avoid such a decrease in the strength of the driving teeth 14, three missing tooth portions 31 are provided corresponding to the positions where the openings 30 are formed as shown in FIG. The toothless portion 31 is formed by omitting several drive teeth 14 in a state of reaching the bottom surface of the drive teeth 14. When the reel is locked, the leg 27 protrudes into the toothless portion 31, but the lower end surface thereof is located on the plane of the tip of the driving tooth 14.

In the reel lock mechanism having such a configuration, the reel presser 16 is held non-rotatably by the guide projection 15 and is pressed down by the spring 17. Further, lock teeth 19.2 provided on the reel presser 16 and the bottom wall of the boss 12 are provided.
0 are engaged with each other. Therefore, the reel 2 in the non-use state can be locked and held so as not to rotate.

In use, the lid 7 is opened and the loading pin 4 is captured by the loading mechanism. At the same time, as shown in FIG. 6, the drive shaft D is pressed against the lower surface of the bottom wall of the boss 12, and the drive teeth are brought into contact with the drive teeth 14 on the reel 2 side. By this joining operation, the lower surface of the reel 2 rises from the bottom wall of the lower case 1b. Further, the leg 27 is pushed up by the drive teeth of the drive shaft D and is pushed upward in the opening 30. As a result, the lock releaser 18 pushes up the reel presser 16 against the spring 17, disengages the lock teeth 19 and 20 that have been engaged up to that point, and releases the reel locked state. As a result, the reel 2 becomes rotatable, so that the tape 3 can be fed or wound. Thereafter, when the drive shaft D separates from the reel 2, the reel 2 can be locked and held again.

The unlocking tool 18 described in the above embodiment.
As shown in the bottom view of FIG. 7 (a), the leg 27 is formed to be curved in an outwardly convex shape, or as shown in the bottom view of FIG. Can be formed by bending into a mountain-shaped outer convex shape. Since the leg piece 27 bent outwardly in this manner can increase the buckling strength and bending strength of the leg piece 27, it prevents the leg piece 27 from being bent when the unlocking device 18 is pushed up, and prevents the leg piece 27 from bending. The locking teeth 19 and 20 can be reliably removed.

The main surface wall 25 of the unlocking tool 18 can be formed in a ring shape so as to surround the outer circumference of the lock teeth 19. In this case, the projections 28 are provided at two or three places along the main surface wall 25. If necessary, a ball can be rotatably arranged at the upper end of the projection 28 to reduce the frictional resistance between the unlocking tool 18 and the reel presser 16 during reel driving.
The lock release tool 18 can be formed of a plastic material such as polyacetal or nylon resin having excellent wear resistance and lubricity. It is preferable to provide three or more leg pieces 27, but it is sufficient if at least two leg pieces 27 are provided. The guide projection 15 can be set to an arbitrary cross-sectional shape as long as it has a non-circular cross section. The leg piece 27 and the opening 30 may be provided inside the region where the driving teeth 14 are formed. In this case, the suction plate 13 is provided with a passage corresponding to the opening 30.

[0024]

According to the present invention, the unlocking tool 18 is provided between the reel presser 6 and the bottom wall of the boss 12, and the plurality of leg pieces 27 provided on the unlocking tool 18 are pushed up to operate. Thus, the reel lock state by the reel presser 16 can be released. Therefore, the reel holder 16 is prevented from tilting as compared with the conventional reel lock mechanism, and a pair of lock teeth 1 provided on the reel holder 16 and the bottom wall of the boss 12 are provided.
Separation of 9 and 20 can be performed reliably. Thereby, the reel 2
Can be prevented from being pulled out while the lock is locked, and the occurrence of a serious accident such as breakage of the tape can be eliminated.

According to the reel mechanism in which the toothless portion 31 is provided in the formation region of the drive tooth 14 and the leg piece 27 projects from the opening 30 provided in the toothless portion 31 to the lower surface side of the reel 2, the reel mechanism is sufficiently moved from the center of the reel. Since the leg 27 is pushed up at a distant position, the unlocking tool 18 can be more reliably prevented from tilting in the radial direction at the time of unlocking. The provision of the toothless portion 31 simplifies the structure of a molding die for forming the drive teeth 14 of the reel 2, eliminates a decrease in the strength of the drive teeth 14, and reduces the loss of the drive teeth 14 during reel drive. Can be prevented. According to the unlocking device 18 provided with the three leg pieces 27, the reel presser 16 at the time of unlocking can be stably supported at three points and can be pushed up.
Even when the contact area with the reel 2 is small, the unlocking tool 18 can be pushed up without any trouble to unlock the reel 2 reliably.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line AA in FIG.

FIG. 2 is an internal plan view of the magnetic tape cartridge.

FIG. 3 is an exploded perspective view of a reel lock mechanism.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a view taken along line CC in FIG. 1;

FIG. 6 is a longitudinal sectional view in an unlocked state.

FIG. 7 is a bottom view showing different embodiments of the leg pieces of the unlocking tool.

FIG. 8 is a longitudinal sectional view showing a comparative example of the reel lock mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main body 2 Reel 3 Magnetic tape 12 Boss 14 Drive tooth 15 Guide protrusion 16 Reel retainer 17 Spring 18 Lock release tool 19/20 Lock tooth 25 Main surface wall 26 Arm 27 Leg piece 30 Opening 31 Missing tooth part D Drive shaft

Claims (4)

[Claims] 1. A single reel 2 on which a magnetic tape 3 is wound is disposed inside a box-shaped case main body 1. An inner bottom of a boss 12 provided at the center of the reel 2 and a case main body 1 are provided. A magnetic tape cartridge provided with a reel lock mechanism for preventing idle rotation of the reel 2 when not in use, the reel lock mechanism protruding from an inner surface of the upper wall of the case body 1. The reel presser 16 is engaged and guided by the guide projection 15 so as to be slidable up and down but cannot rotate relative to each other, a spring 17 for pressing down and pressing the reel presser 16, and the reel presser 16 and the bottom wall of the boss 12. Lock release tool 1 placed between
The lower surface of the reel presser 16 and the upper surface of the bottom wall of the boss 12 are respectively provided with lock teeth 19 and 20 that abut against and engage with each other to prevent the reel 2 from rotating. The unlocking tool 18 includes a main surface wall 25 received on the upper surface of the bottom wall of the boss 12, a protrusion 28 protruding from the upper surface of the main surface wall 25 to push up the reel retainer 16, and a main surface wall 2.
And a plurality of leg pieces 27 protruding below the lower surface of the reel 5, and each leg piece 27 protrudes from the lower surface of the reel 2 via an opening 30 provided in the bottom wall of the boss 12. Single reel type magnetic tape cartridge. 2. Drive teeth 14 for inheriting the rotational power of the drive shaft D of the tape drive are provided in a circular shape on the bottom surface of the bottom wall of the boss 12, and at least a plurality of drive teeth are formed in a plurality of regions where the drive teeth 14 are formed. 2. The toothless part 31 reaching the bottom plane of the tooth 14 is formed, and each leg 27 protrudes toward the lower surface side of the reel 2 through an opening 30 provided in the toothless part 31. Single reel type magnetic tape cartridge. 3. The lock release device 18 includes a main surface wall 25, a protrusion 28 protruding from a central upper surface of the main surface wall 25, and a main surface wall 25.
Leg 27 bent downward from the tip of the peripheral edge 26
The single-reel type magnetic tape cartridge according to claim 1, wherein the single-reel type magnetic tape cartridge is a press-formed product made of a metal plate integrally formed with the magnetic tape cartridge. 4. The single-reel type magnetic tape cartridge according to claim 3, wherein the leg pieces 27 of the unlocking tool 18 are formed to be bent outward in the radial direction of the reel 2.