JP2003022645A - Single reel type tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a single reel type cartridge capable of surely locking a reel while making it possible to suppress the looseness of a tape. SOLUTION: This single reel type tape cartridge has one reel 2, around which a magnetic tap 3 is wound, arranged inside a case main body 1 and has a reel lock mechanism for preventing the reel 2 from rotating when unused. In the reel lock mechanism, a reel presser foot 16 supported by the case main body 1 in an unrotatable way in the rotating direction of the reel 2 is subjected to pressing energization toward a bottom wall of a boss 12 by a compressed coil spring 17 to make the lock gear teeth 19 of the boss 12 engage with the lock gear teeth 20 of the reel presser foot 16. Pitches P1 of the lock gear teeth 20 of the reel presser foot 16 are two times as long as those P2 of the lock gear teeth 19 of the boss 12. In the lock gear teeth of the reel presser foot 16, the space between base ends 20a of adjacent gear teeth is equal to a pitch P2 of the lock gear teeth 19 of the boss 12.

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 tape cartridge having a reel lock mechanism.

[0002]

2. Description of the Related Art A single reel type tape cartridge is known, for example, from Japanese Patent Laid-Open No. 2000-339911. There, a reel lock mechanism is provided between the bottom wall of the boss provided in the center of the reel and the upper wall of the case body to prevent the reel from idling and prevent tape slack when the tape cartridge is not in use. Has been.

In this reel lock mechanism, a lock tooth having a mountain-shaped cross section is provided in a circular shape on the lower surface of a reel retainer supported so as not to rotate relative to the case body, and the bottom wall of the boss is opposed to the lock tooth of the reel retainer. Lock teeth having a chevron cross section are provided on the upper surface in a circular shape. The reel retainer is pressed and urged toward the bottom wall of the boss so that the lock teeth on the reel retainer side mesh with the lock teeth on the boss side, thereby preventing the reel from rotating.

[0004]

When the lock teeth are meshed with each other, the lock teeth of the reel retainer relatively move on the slope of the lock teeth of the boss due to the displacement of the relative positions of the lock teeth in the circumferential direction. By pressing and relatively sliding on the slope, the reel retainer and the lock teeth of the boss mesh with each other. At this time, a rotational force is applied to the boss, the reel moves in the winding direction, and the tape loosens.

In order to suppress the movement of the reel, it is effective to reduce the pitch of the lock teeth of the boss and the reel retainer. However, if the pitch is reduced, the number of teeth that mesh with each other increases and the meshing of the lock teeth deteriorates, which causes a problem in that the reel cannot be reliably locked.

An object of the present invention is to obtain a single reel type tape cartridge which can surely lock the reel while suppressing the slack of the tape.

[0007]

A single-reel type tape cartridge to which the present invention is directed has a case body 1 in which one reel 2 on which a tape 3 is wound is arranged. A reel lock mechanism that prevents rotation of the reel 2 when not in use is provided between the bottom wall 12a of the bottomed cylindrical boss 12 provided at the center of the and the upper wall of the case body 1.

The reel lock mechanism is movable in the vertical direction, but is not rotatable in the rotation direction of the reel 2. The reel retainer 16 is supported by the case body 1 and the reel retainer 16 is provided in the boss 12. Urging means 17 for urging the boss 12 toward the bottom wall 12a thereof, and a pair of bosses provided on the upper surface of the bottom wall of the boss 12 and the lower surface of the reel retainer 16 in the rotational direction of the reel 2 and meshing with each other. Lock teeth 19
20 and 20. The pitch of the lock teeth of one of the reel retainer 16 and the boss 12 is substantially a natural number multiple of twice or more the pitch of the other lock tooth. And
The distance between the base ends of adjacent teeth of one lock tooth is substantially a natural multiple of the pitch of the other lock tooth. The natural number times here include 1 times, 2 times, 3 times, and the like.

Specifically, the pitch of one lock tooth is
The pitch is substantially twice the pitch of the other lock tooth, and the distance between the base ends of the adjacent teeth of the one lock tooth is substantially equal to the pitch of the other lock tooth. Further, the space between the base ends of the adjacent teeth of one of the lock teeth may be planar. The planar shape here includes a concavo-convex state that does not affect the meshing of the lock teeth.

[0010]

The single reel type tape cartridge of the present invention has a lock tooth 1 of a boss 12 and a reel retainer 16.
Even if the pitches of 9 and 20 are made smaller, the number of the lock teeth 19 and 20 meshing is reduced by the amount that the pitch of one lock tooth is larger than the pitch of the other lock tooth, so that the meshing can be done smoothly. it can. As a result, the reel 2 can be reliably locked by the reel retainer 16.

That is, when the lock teeth 19 and 20 are engaged with each other to lock the reel 2, the lock teeth 1
Due to the deviation of the relative position in the orbiting direction between 9 and 20,
The boss 12 moves up to 1/2 of the lock tooth pitch,
As a result, the reel 2 may move and the tape 3 may loosen.

In order to reduce the slack of the tape 3, it is conceivable to reduce the pitch of the lock teeth 19 and 20, respectively. However, if the pitch of the lock teeth 19 and 20 is decreased, the lock teeth 19 and 20 that mesh with each other will be reduced. There is a possibility that the number of the reels 2 will increase and the meshing will deteriorate, so that the reel 2 cannot be reliably locked. On the other hand, in the present invention, the pitch of one lock tooth is made larger than the pitch of the other lock tooth, so that the number of meshing lock teeth 19 and 20 is reduced, and the meshing is smoothly performed. As a result, the reel 2 can be reliably locked while the slack of the tape 3 can be suppressed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings illustrate a single-reel type tape cartridge according to the present invention, and as shown in FIG. 3, a rectangular box-shaped case in which upper and lower cases 1a and 1b are joined together in a lid-like manner. One reel 2 is housed inside the main body 1, and a magnetic tape 3 (hereinafter simply referred to as tape) is wound around the reel 2. 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 positioned and accommodated inside a tape outlet 5 that is opened at the front right corner of the case body 1, and its upper and lower ends are engaged by holders 6 provided on the inner surfaces of the upper case 1a and the lower case 1b. Are held together. The tape outlet 5 can be opened and closed with a lid 7 that can slide left and right.
Is urged to move freely by a spring (not shown).

In FIG. 4, the reel 2 has an upper flange 1
0, the lower flange 11, and a bottomed cylindrical boss 12 that is integrally formed with the lower flange 11 and opens upward.
A reel lock mechanism is provided between the bottom wall 12a of the boss 12 and the upper wall of the upper case 1a to lock the reel 2 so as not to idle when it is not used. The upper flange 10 is fixed to the upper end of the boss 12 by welding.
A magnetically attractable attracting plate 13 made of a circular steel plate or the like is fixed to the center of the bottom wall 12a of the boss 12 on the outside of the lower surface, and drive teeth 14 are provided on the outside of the attracting plate 13 in a circular shape. . The drive teeth 14 are formed by gear teeth having a saw-toothed cross section that extends in the radial direction as shown in FIG. 5, and are provided on the outer surface of the case through the drive holes 8 provided in the bottom wall of the lower case 1b as shown in FIG. 6 and engages with drive teeth provided on the shaft end surface of the drive shaft D on the tape drive side shown in FIG.
Inherits the rotational force of.

As shown in FIG. 4, the reel lock mechanism is slidable in the vertical direction with respect to the guide protrusion 15 provided on the inner surface of the upper case 1a, but is supported so as not to be rotatable relative to the case body 1. Reel retainer 16 that is formed, a compression coil spring (biasing means) 17 disposed between the reel retainer 16 and the upper case 1a, and the bottom wall 12a of the boss 12.
And a lock tooth 20 provided on the lower surface of the reel retainer 16 and the like. Guide protrusion 1
Reference numeral 5 is formed by a cross-shaped guide wall that intersects orthogonally as shown in FIG. Between the reel retainer 16 and the upper surface of the bottom wall 12 a of the boss 12, a lock release tool 18 for releasing the lock of the reel retainer 16 is arranged.

The reel retainer 16 is made of a round plate-shaped plastic molded product having an upward opening, in which a circular base wall 21 having a circular base wall 21 is provided so as to project. Four ribs 23 having an L-shaped cross section are provided at the center of the upper surface of the base wall 21, and cross-shaped slide grooves 24 are formed by these ribs 23.
Is defined. The guide projection 15 is fitted into and engaged with the slide groove 24 only for vertical sliding. Base wall 2
As shown in FIG. 4, a socket portion 25 is provided at the center of the lower surface of 1, and lock teeth 20 are provided on the outer periphery of the socket portion 25. The lock tooth 20 is composed of a tooth body having a chevron cross section that extends in the radial direction (see FIG. 1). Compression coil spring 17
Is attached to the guide projection 15 as shown in FIG. 4, and its lower end is received by the upper surface of the base wall 21.

The lock tooth 19 of the boss 12 is composed of a tooth body having a mountain-shaped cross-section having the same shape as the lock tooth 20 extending in the radial direction (see FIG. 1), and is projected in a circumferential shape so as to face the lock tooth 20 of the reel retainer 16. It is set up. With the reel retainer 16 held by the guide protrusion 15 so as not to rotate, the compression coil spring 1
When pushed down by the urging force of 7, the lock teeth 20 of the reel retainer 16 and the lock teeth 19 of the boss 12 mesh with each other as shown in FIG.

As shown in FIG. 1, the lock teeth 20 of the reel retainer 16 have a pitch P1 on the boss 12 side.
It is twice the pitch P2 of 9. Further, in the lock teeth 20 on the reel retainer 16 side, the distance between the base ends 20a of the adjacent teeth is equal to the pitch P2 of the lock teeth 19 on the boss 12 side, and the base ends 20a of the adjacent teeth are almost the same. It is flat.

That is, when the lock teeth 20 of the reel retainer 16 and the lock teeth 19 of the boss 12 are meshed with each other, the reel retainer 16 is displaced due to the displacement of the relative positions of the lock teeth 19 and 20 in the circumferential direction. The lock tooth 20 of the boss 12 pushes the slope of the lock tooth 19 of the boss 12, and relatively slides on the slope. At this time, a rotational force is applied to the boss 12 and the boss 12 and the reel 2 move in the orbiting direction. In this case, the maximum movement amount of the boss 12 is the pitch P of the lock teeth 19.
Since it is 1/2 of 2, the pitch P2 is reduced,
The amount of movement of the reel 2 is suppressed and the amount of slack of the tape 3 is suppressed.

The pitch P of the lock teeth 20 of the reel retainer 16
The larger 1 is, the smaller the number of the lock teeth 19 and 20 meshing with is smaller than the number of the lock teeth 19 of the boss 12. Therefore, the pitches P1 and P2 are reduced to lock teeth 19
・ Lock teeth 19.2 that mesh even if the number of 20 increases
The number of 0s can be reduced so that they can be reliably engaged. As a result, the reel 2 can be reliably locked by the reel retainer 16.

Two lock teeth 19 of the boss 12 are inserted between the base ends 20a of adjacent teeth of the lock teeth 20 of the reel retainer 16 as shown in FIG. 2, but the base ends 20a of the lock teeth 20 of the reel retainer 16 are inserted. Since the space is almost flat, this base end 2
The lock teeth 19 of the boss 12 are properly meshed between 0a.

The lock release tool 18 is, as shown in FIG.
A leg piece made of a press-formed product made of a steel plate such as a stainless steel plate and having three arms 28 radially extending from the peripheral edge of the circular main surface wall 27 at equal intervals and bending downward at the tip of each arm 28. 29 is integrally formed. Main wall 2
As shown in FIG. 4, a horizontal plane 30 for receiving the ball 26 rotatably press-fitted in the recess 25 of the reel retainer 16 is bulged upward at the center of the base 7.

In the unlocking tool 18 when the tape cartridge is not used, the main surface wall 27 is received and supported by the base wall 21 of the reel retainer 16 under the biasing force of the compression coil spring 17. In this receiving state, in order to prevent the arms 28 from coming into contact with and interfering with the lock teeth 19 of the boss 12, the annular row of the lock teeth 19 is divided at three positions in the circumferential direction as shown in FIG. Each arm 28 is positioned within 19a.

Further, a leg piece 29 provided at the tip of each arm 28 is projected toward the lower surface side of the reel 2 to utilize the engaging operation between the drive tooth 14 and the drive shaft D of the tape drive to release the lock. In order to operate the push-up operation of the boss 18, three openings 31 are vertically penetrated in a region where the drive teeth 14 are formed on the bottom wall of the boss 12. The lower end surface of the leg piece 29 when the reel is locked is located on the tip plane of the drive tooth 14 (see FIG. 4).

That is, when the tape cartridge is used, the lid 7 is opened on the tape drive side to capture the loading pin 4 by the loading mechanism, and at the same time, the drive shaft D
Is pressed against the bottom surface of the bottom wall of the boss 12 so that the drive teeth of the boss 12 mesh with the drive teeth 14 of the reel 2. By this operation, the lower surface of the reel 2 floats from the bottom wall of the lower case 1b. Further, the leg pieces 29 are pushed up by the drive teeth of the drive shaft D.

As a result, the lock release tool 18 pushes up the reel retainer 16 against the urging force of the compression coil spring 17 and disengages the lock teeth 19 and 20 that have been meshed until then to release the reel lock state. (State of FIG. 6). As a result, the reel 2 becomes rotatable and the tape 3
Can be driven out or rolled up. After this, when the drive shaft D separates from the reel 2, the lock teeth 19.2.
The 0s mesh with each other and the reel 2 is locked.

In the unlocked state, in order to prevent the reel retainer 16 from tilting and its lock tooth 20 engaging with the lock tooth 19 of the boss 12, the upper peripheral edge of the regulating wall 22 and the inner surface of the upper case 1a are prevented. The upper and lower tiltable gaps between and are smaller than the vertical tilting gaps between the tips of the lock teeth 19 and 20.

The pitch P2 of the lock teeth 19 of the boss 12 is set to be twice the pitch P1 of the lock teeth 20 of the reel retainer 16, and the distance between the base ends of the adjacent teeth of the lock teeth 19 of the boss 12 is set to the reel retainer 16 Pitch P1 of lock teeth 20
May be made equal to, and the space between the base ends of the adjacent teeth may be substantially flat.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing lock teeth of a reel lock mechanism.

FIG. 2 is a vertical cross-sectional view showing a meshing state of reel retainer and lock teeth of a boss.

FIG. 3 is an internal plan view of the tape cartridge.

FIG. 4A in FIG. 3 showing a locked state of the reel lock mechanism.
It is a sectional view taken along line A-A.

5 is a view taken along the line BB of FIG.

FIG. 6 is a view showing an unlocked state of the reel lock mechanism.
FIG.

FIG. 7 is an exploded perspective view of a reel lock mechanism.

8 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

1 case body 2 reel 3 magnetic tape 12 Boss 12a bottom wall 16 reel presser 17 Compression coil spring 19 ・ 20 Lock teeth 20a base end P1 Pitch of lock teeth on reel retainer P2 Boss lock tooth pitch

Claims (3)

[Claims] 1. A reel around which a tape is wound is arranged inside a case body, and a bottom wall of a cylindrical boss with a bottom provided in the center of the reel and an upper part of the case body. In a single reel type tape cartridge provided with a reel lock mechanism for preventing rotation of the reel when not in use between the wall and the wall, the reel lock mechanism can move in the vertical direction. A reel retainer supported by the case body so as not to rotate in the rotation direction of the reel; an urging means for urging the reel retainer to the bottom wall side of the boss; and an upper surface of the bottom wall of the boss. The reel retainer has a pair of lock teeth provided on the surface facing the lower surface and meshing with each other in the rotation direction of the reel, and the pitch of the lock teeth of one of the reel retainer and the boss is , Real Qualitatively, the pitch of the other lock tooth is not less than twice the natural number, and the distance between the base ends of the adjacent teeth of the one lock tooth is substantially equal to the natural pitch of the other lock tooth. A single-reel type tape cartridge that is several times larger. 2. The pitch of the one lock tooth is substantially twice the pitch of the other lock tooth, and
2. The single-reel type tape cartridge according to claim 1, wherein a gap between the base ends of the adjacent teeth of one of the lock teeth is substantially equal to the pitch of the other of the lock teeth. 3. The single-reel type tape cartridge according to claim 1, wherein a space between the base ends of the adjacent teeth of one of the lock teeth is flat.