JPH03104052A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To surely prevent a magnetic tape from being broken by the movement of a cassette at the time of drawing out the magnetic tape by providing an engaging and disengaging means for performing the engaging and disengaging of a motor gear and a moving gear by inerlocking with the engaging and disengaging of 1st and 3rd levers. CONSTITUTION:After setting a cassette on a loading position, a cam gear 20 rotates in an A direction by rotating a driving motor and the 1st lever 24 turns clockwise centering around a supporting shaft 25. With the turning of the 1st lever 24, an engaging pin 52 is engaged with a release groove 51 and the 3rd lever 50 turns counterclockwise centering around a supporting shaft 41, so that the meshing of the motor gear 46 with the moving gear 42 is released. The pin 52 is completely separated from the groove 51 on this side where the lever 50 abuts on a stopper pin 45. With the rotation of the gear 20, the 2nd lever 30 turns counterclockwise centering around a supporting shaft 31 and a plate 34 moves in a B direction and the magnetic tape in the cassette is drawn out. Thus, the tape is surely prevented from being broken by moving cassette at the time of drawing out the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic tape device in which the rotational torque of a capstan motor is transmitted to a cassette loading mechanism as well as a tape drive mechanism. [Prior Art] FIG. 4 is a back view of a digital audio tape recorder (DAT), which is a magnetic tape device for which the present applicant has already applied, and FIG. 5 is a back view showing another mode of use of FIG. 4. ,
6 is a side view of the main part of FIG. 5, in which 1 is a capstan motor provided on the upper surface of the deck base 7 (on the back side of the paper in FIG. 3), 2 is a motor shaft of the capstan motor 1, 3 is a boule fixed to the motor shaft 2, 46 is a motor gear fixed to the motor shaft 2, 4
5 is a flywheel rotatably attached to the lower surface of the deck base 7, and 5 is an upward direction from the flywheel 4 (third
A capstan 6 projecting in the direction in which the paper is opened in the figure is a belt wound around the flywheel 4 and the pulley 3.

20 is a force l1 gear provided on the lower surface of the deck base 7 so as to be rotatable around the first boss 21; 22 is a cam gear 2;
0, 23 is a second cam groove formed in the cam gear 20, 24 is a first lever rotatable around the first support shaft 25, and 26 is a first cam groove formed in the cam gear 20; The first bin 27 is attached to the tip of the lever 24 and moves the first cam eraser 22; 30 is a second lever that is rotatable around a second support shaft 31; 32 is a second lever that is attached to the middle part of the second lever 30 and that freely moves the second cam controller 23;
33 is a second engagement bin attached to the tip of the second lever 30; 34 is a plate having an engagement hole 35 at its end that engages with the second engagement bin 33; A guide groove is formed in the middle of the plate 34 and works together with the guide pin 37 to guide the movement of the plate 34. 40 is a third lever that seesaws around a third support shaft 41;
Reference numeral 2 denotes a moving gear which is rotatably provided at the tip of the third lever 40 around the post 47 and is meshed with the output gear 12; A spring 44 biases the first lever 24 in the clockwise direction, and a contact pin 45 is attached to the base end of the third lever 40. A spring 45 biases the third lever 40 in the clockwise direction. This is a stopper bin that prevents the rotor from rotating counterclockwise about the third support shaft 41 by more than a predetermined angle.

Next, the operation of the above-mentioned DAT will be explained. The rotation of the capstan motor 1 rotates the output gear 12 via the motor gear 46 and the moving gear 42, and the rotational torque is equal to the cassette loading t! ! t'R (not shown) to move the cassette holder from the cassette insertion position to the cassette mounting position in an L-shaped trajectory;
The reel is inserted into the reel hole of the cassette, and the cassette is set at the cassette mounting position.

After the cassette is set in the cassette loading position,
Due to the rotation of the drive motor (not shown), the cam gear 20 rotates in the direction of arrow A, the first bin 26 is guided along the first force groove 22, and the first lever 24 is moved into the first It rotates clockwise around the support shaft 25 of.

As the first lever 24 rotates, the third lever 40 seesaws around the third support shaft 41 due to the biasing force of the spring 43, causing the motor gear 46 and the moving gear 42 to rotate.
The meshing with is canceled. Further, braking of the reel is controlled via a reel brake machine yt (not shown) connected to the first engagement pin 27.

Further, as the cam gear 20 rotates in the direction of arrow A, the second pin 32 is subjected to a second force j. 7i23, the second lever 30 moves concavely in the counterclockwise direction around the second support shaft 31, and as a result, the plate 34 moves in the direction of arrow B.
The magnetic tape in the cassette is pulled out through a tape loading mechanism (not shown) toward a rotating drum that exchanges information.

This magnetic tape is transferred to a rotating drum by rotational torque transmitted from a capstan motor 1 through a motor shaft 2, a pulley 3, a belt 6, a flywheel 4, a capstan 5, and a tape drive mechanism (not shown). It is run while touching.

[Problems to be Solved by the Invention] The above-mentioned DAT, which has already been filed by the present applicant, is configured such that the rotational torque of the capstan motor 1 is transmitted to the cassette loading mechanism as well as the tape drive mechanism. Although it has the effect of reducing the amount of energy, making it possible to downsize, and reducing production costs, it still has the following problems.

For example, the first lever 24 rotates clockwise about the first support shaft 25, and the third lever 40 rotates with the spring 4.
Although the urging force of No. 3 causes the third support shaft 41 to rotate counterclockwise and the meshing between the motor gear 46 and the moving gear 42 should be released, for some reason the third With the lever 40 not pivoting and the motor gear 46 and the moving gear 42 meshing, the flywheel 4 rotates and the tape drive mechanism operates to move the cassette and pull out the magnetic tape from the cassette. are performed at the same time, and there is a risk of damaging the magnetic tape. This invention was made to solve this problem, and prevents damage to the magnetic tape caused by the movement of the cassette and the operation of pulling out the magnetic tape from the cassette at the same time. The purpose is to obtain a magnetic tape device.

[Means for Solving the Problems] The magnetic tape device according to the present invention has a first lever and a third lever.
The motor gear is provided with a means for engaging and disengaging the motor gear and the moving gear in conjunction with the engagement and disengagement with the lever.

[Operation] In this invention, the third lever engaged with the first lever is rotated in a direction to separate the moving gear from the motor gear by rotation of the first lever, and the third lever is rotated in a direction to separate the moving gear from the motor gear. When the engagement with the lever is released, the moving gear has separated from the motor gear. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3 show one embodiment of the present invention, and the same or corresponding parts as in FIGS. 4 to 6 are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, 50 is a third lever that rotates around the third support shaft 41, 51 is a release groove formed at the base end of the third lever 50, and 52 is the tip of the first lever 24. Attached to the part and released? The third engaging pin 52 and the release groove 51 constitute an engaging/disengaging means.

In the magnetic tape device configured as described above, the rotation of the capstan motor 1 rotates the output gear 12 via the motor gear 46 and the moving gear 42, and the rotational torque is transmitted to the cassette loading mechanism (not shown). The cassette holder is moved from the cassette insertion position to the cassette mounting position via the cassette, and the cassette is set at the cassette mounting position. After the cassette is set in the cassette loading position,
Due to the rotation of the drive motor (not shown), the cam gear 20 rotates in the direction of arrow A, and the first lever 24 is moved toward the first support shaft 2.
Rotate clockwise around 5. As the first lever 24 rotates, the release ring 51 is engaged with the third engagement pin 52, so the third lever 50 is moved by the biasing force of the spring 43 and the first lever 24. The rotating forces cooperate to forcibly rotate the gear in a counterclockwise direction around the third support shaft 41, and the meshing between the motor gear 46 and the moving gear 42 is forcibly released. Before the third lever 50 comes into contact with the stopper bin 45, the third engagement bin 52 is completely disengaged from the release eraser 51 (see Fig. 2), and thereafter, as the cam gear 20 rotates in eight directions. The first lever 24 rotates clockwise.

Further, as the cam gear 20 rotates in the direction of arrow A, the second lever 30 rotates counterclockwise around the second support shaft 31, and as a result, the plate 34 moves in the direction of arrow B, and the tape loading The magnetic tape in the cassette is pulled out toward the rotating drum via a machine tllI (not shown).Although the above embodiment describes a DAT as a magnetic tape device, this invention can also be applied to devices other than DAT. Of course you can.

Further, in the above embodiment, a release 151 is provided on the third lever 50 as a means for engaging and disengaging the third lever 50 and the first lever 24.
, and the third engagement pin 52 is attached to the first lever 24, but for example, an engagement pin is provided on the third lever and the first
[Effect of the Invention] As explained above, according to the magnetic tape device of the present invention, the release groove may be formed in the lever of the first lever and the third lever. By providing the engaging and disengaging means for engaging and disengaging the motor gear and the moving gear, when the motor gear and the moving gear are disengaged, the gearing between the two is reliably released.For example, when a magnetic tape is being pulled out from a cassette, This has the effect of reliably preventing damage to the magnetic tape due to movement of the cassette due to interference between the moving gear and the motor gear.

[Brief explanation of drawings]

FIG. 1 is a back view of the main part of a DAT showing an embodiment of the present invention, FIG. 2 is a back view of the main part showing another usage mode of the DAT shown in FIG. 1, and FIG. 3 is a still another use of the DAT shown in FIG. A back view of the main part showing the aspect,
FIG. 4 is a back view of the main part showing an example of a conventional magnetic tape device, FIG. 5 is a back view of the main part showing another usage mode of the one shown in FIG. 4, and FIG. be. In the figure, 1 is a cab stan motor, 2 is a motor shaft, 5 is a capstan, 12 is an output gear, and 20 is a power l
1 gear, 24 is the first lever, 42 is the moving gear, 46 is the motor gear, 50 is the third lever, 51 is the release groove, 52
is the third related bin. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A cassette loading mechanism that moves a cassette between a cassette insertion position and a cassette mounting position, and a capstan motor that rotates a capstan that is provided separately from the capstan motor to run the magnetic tape inside the cassette. a tape loading mechanism that directs the magnetic tape toward a rotating drum and pulls it out of the cassette using a cam gear rotated by the rotation of a drive motor; a motor gear fixed to a motor shaft of the capstan motor; It includes first and third levers that rotate by rotation, and a moving gear that is rotatably provided on the third lever, and when the third lever rotates, the moving gear meshes with the motor gear. In the magnetic tape device in which the rotational torque of the capstan motor is transmitted to the cassette loading mechanism, the first lever and the third lever are configured to engage and disengage. 1. A magnetic tape device comprising: a means for engaging and disengaging a motor gear and a movable gear in conjunction with the engagement and disengagement of a first lever and a third lever.