JPH0845227A - Tape cassette - Google Patents

Abstract

PURPOSE:To prevent the generation of scintillation due to slackening even when slackening occurs in the inner layer of a magnetic tape caused by a difference in heat shrinking rates between a supply reel and the magnetic tape wound thereon in a low temperature. CONSTITUTION:A reel locking mechanism 4 for a supply reel desined to prevent the rotation in one direction of the supply reel 2 and the takeup reel 3 of a tape cassette 1 during transportation and a reel locking mechanism 5 for a takeup reel are provided. The reel locking mechanism 4 for a supply reel is structured so as to prevent the rotation of the supply reel 2 in a tape winding direction and to allow the rotation in a tape sending out direction. The reel locking mechanism 5 for a takeup reel is structured so as to allow the rotation of the takeup reel 3 in the tape winding direction and to prevent the rotation in the tape sending out direction. The reel locking mechanisms 4 and 5 for the supply reel and the takeup reel are constructed by ratchet mechanisms.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette equipped with a reel lock mechanism for preventing the magnetic tape from loosening due to vibration during transportation.

[0002]

2. Description of the Related Art As a tape cassette provided with a reel lock mechanism for preventing the magnetic tape from loosening due to vibration during transportation, the one shown in FIG. 3 is known.

The conventional tape cassette 101 described above has a reel lock mechanism 103 for the supply reel that allows the supply reel 102 to rotate in the magnetic tape winding direction and prevents rotation in the tape feeding direction, and a take-up reel 1.
And a reel lock mechanism 105 for the take-up reel that allows rotation of the tape 04 in the tape winding direction and blocks rotation in the tape feeding direction.

The reel lock mechanism 103 for the supply reel is a flange 102 of the supply reel 102.
Claw wheel (ratchet wheel) provided on the outer periphery of a
1 and a claw (ratchet) whose tip engages with the claw wheel 111
112 and a spring member 113 for pressing the tip of the claw 112 to the claw wheel 111.

When the supply reel 102 tries to rotate in the tape feeding direction due to vibration during transportation or the like, as shown in FIG. 111a to prevent the supply reel 102 from rotating in the tape feeding direction (clockwise direction in FIG. 4A).

Further, the reel lock mechanism 105 for the take-up reel has a ratchet wheel 121 provided on the outer periphery of the flange 104a of the take-up reel 104, a claw 122 whose tip engages with the ratchet wheel 121, and A spring member 123 in which the tip of the pawl 122 is crimped onto the ratchet wheel 121.
It has and.

When the take-up reel 104 tries to rotate in the tape feeding direction due to vibration during transportation or the like, the tip end of the claw 122 moves to the claw wheel 121 as shown in FIG. 4B. It engages with the teeth 121a and prevents the take-up reel 104 from rotating in the tape feeding direction (counterclockwise direction in FIG. 4B).

Reference numeral 131 is a magnetic tape.

[0009]

In the conventional tape cassette described above, as described above, the reel lock mechanism 103 for the supply reel and the reel lock mechanism 105 for the tick-up reel are both reel tapes. The rotation of the supply reel 10 is prevented by blocking the rotation in the feeding direction and allowing the reel to rotate in the tape winding direction.
2 and the take-up reel 104 both rotate in the tape winding direction to wind the magnetic tape 131.
While there is an advantage that the slack of 31 can be effectively removed, there are the following problems.

(1) The magnetic tape 131 tends to be excessively wound.

(2) When the magnetic tape 13 is transported at a low temperature such as a severe cold season, as shown in FIG.
The slack 131a is generated in the inner layer portion (inner peripheral side) of No. 1. In this state, when the supply reel 102 rotates in the tape winding direction, the magnetic tape 131 is wound tightly, and the outer diameter is compressed in the inner layer portion of the magnetic tape 131.
The circumference is reduced, and wrinkles occur on the magnetic tape 131 (this is generally called cinching).

The present invention has been made in order to solve the above-mentioned conventional problems and to provide a tape cassette which does not cause cinching even during transportation in a severe cold season.

[0013]

According to a first aspect of the present invention, in a tape cassette including a reel lock mechanism for a supply reel and a reel lock mechanism for a take-up reel, the reel lock mechanism for the supply reel is provided. , The rotation of the supply reel in the tape winding direction is blocked and the rotation of the supply reel in the tape feeding direction is permitted, and the reel lock mechanism for the above-mentioned tick-up is rotated in the tape winding direction Is allowed and the rotation in the tape feeding direction is prevented.

According to a second aspect of the present invention, in the tape cassette of the first aspect, the reel lock mechanism is a ratchet mechanism.

[0015]

According to the tape cassette of claim 1, even when the inner layer portion of the magnetic tape is loosened due to a difference in heat shrinkage between the supply reel and the magnetic tape at a low temperature, the supply reel is taped by the reel lock mechanism. Since the rotation in the winding direction is prevented, the looseness of the inner layer portion of the magnetic tape is prevented from being tightened.

According to another aspect of the tape cassette of the present invention, the claw engages with the ratchet wheel to reliably prevent the supply reel from rotating in the tape winding direction.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the tape cassette of the present invention will be described with reference to FIGS.

FIG. 1 is a plan view of the tape cassette 1.

The tape cassette 1 comprises a magnetic tape 13
The supply reel 2 around which the supply reel 1 is wound, the take-up reel 3 around which the magnetic tape 131 is wound from the supply reel 2, and the supply reel which prevents the supply reel 2 from rotating in one direction and allows rotation in the other direction. And a reel lock mechanism 5 for the take-up reel that prevents the take-up reel 3 from rotating in one direction and allows the take-up reel 3 to rotate in the other direction.

The reel lock mechanism 4 for the supply reel prevents rotation of the supply reel 2 in the tape winding direction (counterclockwise direction in FIG. 1) and the tape feeding direction (FIG. 1).
It is configured to allow rotation in the clockwise direction.

The take-up reel lock mechanism 5 allows the take-up reel 3 to rotate in the tape winding direction (clockwise direction in FIG. 1) and the tape feeding direction (counterclockwise direction in FIG. 1). It is designed to prevent rotation to.

The reel lock mechanism 4 for the supply reel is provided with a ratchet wheel 11 provided on the outer periphery of the lower flange 2a of the supply reel 2 and a ratchet having a tip engaged with the ratchet wheel 11. 12 and the nail 1
Spring member 13 in which the tip of 2 is crimped to the ratchet wheel 11
It is composed of a ratchet mechanism with and.

When the supply reel 2 tries to rotate in the tape winding direction due to vibration or the like during transportation,
As shown in FIG. 2A, the tip of the pawl 12 engages with the tooth 11a of the pawl wheel 11 to prevent the supply reel 2 from rotating in the tape winding direction. ing.

Further, the take-up reel lock mechanism 5 has a ratchet wheel 21 provided on the outer periphery of the lower flange 3a of the take-up reel 3, a ratchet 22 having a tip engaged with the ratchet wheel 21, and The ratchet mechanism is provided with a spring member 23 that presses the tip of the pawl 22 onto the ratchet wheel 21.

When the take-up reel 3 tries to rotate in the tape feeding direction due to vibration during transportation, etc., as shown in FIG. It engages with the teeth 21a of the tape and prevents the take-up reel 2 from rotating in the tape feeding direction.

In FIG. 1, 141 is a leader tape attached to one end of the magnetic tape 131.

One end of the leader tape 141 is locked to the take-up reel 3 by a clamper 151.

The tape cassette 1 of the embodiment is constructed as described above.

Therefore, when the magnetic tape 131 wound around the supply reel 2 is loosened due to vibration during transportation or the like, the take-up reel 3 rotates in the tape winding direction to rotate the magnetic tape 131. Remove slack.

Further, even when the inner layer portion of the magnetic tape 131 is loosened due to the difference in heat shrinkage between the supply reel 2 and the magnetic tape 131 during transportation at a low temperature,
The supply reel 2 is prevented from rotating in the tape winding direction by the reel lock mechanism 4 for the supply reel.

Therefore, under the above circumstances, the occurrence of cinching caused by the rotation of the supply reel 2 in the tape winding direction can be reliably prevented.

The supply reel 2 and the take-up reel 3 are locked by the reel lock mechanisms 4 and 5 when the tape cassette 1 is loaded into the tape drive device by a release mechanism provided in the drive device. ，
22 is pushed back against the spring force of the spring members 13 and 23, the claws 12 and 22 are disengaged from the claw wheels 11 and 21, and are automatically released.

[0033]

The tape cassette of the present invention has the following effects.

(1) In the tape cassette of claim 1, since the reel lock mechanism for the supply reel prevents the supply reel from rotating in the tape winding direction, the supply reel and the magnetic tape are transported during transportation at a low temperature. Due to the difference in the heat shrinkage ratio, it is possible to reliably prevent the occurrence of cinching caused by the rotation of the supply reel in the tape winding direction when the inner layer portion of the magnetic tape is loosened.

Further, the take-up reel can be rotated in the tape winding direction by the reel lock mechanism for the take-up reel, so that even if the magnetic tape is loosened due to vibration during transportation, the like take-up reel is used. The reel rotates in the tape winding direction to remove the looseness of the magnetic tape.

(2) In the tape cassette of the second aspect, since the reel lock mechanism is constituted by the ratchet mechanism, in the conventional tape cassette that rotates both the supply reel and the take-up reel in the tape winding direction, The direction of the claws of the reel lock mechanism for the supply reel, which was oriented in the direction opposite to the direction of the claws of the reel lock mechanism for the up reel, is arranged in the same direction as the direction of the claws of the reel lock mechanism for the take-up reel. By a simple method, the supply reel can be prevented from rotating in the tape winding direction, and only the take-up reel can be rotated in the tape winding direction.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a tape cassette of the present invention.

2A and 2B are partially cutaway enlarged plan views of the reel lock mechanism of the present invention.

FIG. 3 is a plan view of a conventional tape cassette.

4A and 4B are partially cutaway enlarged plan views of a reel lock mechanism of a conventional example.

FIG. 5 is a plan view showing a problem of the conventional example.

[Explanation of symbols]

 1 ... Tape cassette 2 ... Supply reel 3 ... Take-up reel 4 ... Reel lock mechanism for supply reel 5 ... Reel lock mechanism for take-up reel

Claims (2)

[Claims] 1. A tape cassette comprising a reel lock mechanism for a supply reel and a reel lock mechanism for a take-up reel, wherein the reel lock mechanism for the supply reel is configured to rotate the supply reel in a tape winding direction. The take-up reel reel lock mechanism allows the take-up reel to rotate in the tape winding direction and prevents the take-up reel from rotating in the tape feeding direction. A tape cassette characterized by being configured to prevent rotation. 2. The tape cassette according to claim 1, wherein the reel lock mechanism is a ratchet mechanism.