JPH0863836A - Magnetic recorder/player - Google Patents

Abstract

PURPOSE: To realize stabilized FF/REW by running a tape while winding around a pinch roller and absorbing the uneven force through automatic self-aligning function thereby suppressing fluctuation in the breadthwise direction of the tape. CONSTITUTION: A ball bearing 27 is provided with a clearance between inner and outer rings 29, 28 thereof. Consequently, a degree of freedom is provided in the inclination between a shaft 30 and a roller 26 and automatic sell-aligning function acts on a pinch roller 21 with respect to a capstan shaft 24 under PLAY state. Consequently, a press contact force is applied uniformly to a tape T in the breadthwise direction thereof thus realizing stabilized running of tape. At the time of FF/REW, the tape T is removed from the capstan shaft 24 and the force is not applied uniformly to the tape in the breadthwise direction and thereby the tape T fluctuates in the breadthwise direction. When the tape T is run while winding around the pinch roller 21, uneven force is absorbed through the automatic self-aligning function to suppress fluctuation of the tape in the breadthwise direction thus realizing stabilized FF/REW.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape running mechanism suitable for an ultra-small video tape recorder (VTR) such as 8 mm video and digital video.

[0002]

2. Description of the Related Art In recent years, miniaturization of VTR has progressed and digital V
A new VTR called TR is being developed.
In the cassette for the digital VTR, the tape guide roller near the opening of the cassette is omitted for downsizing like the 8 mm video. Therefore, the tape cannot run while the tape is stored in the cassette. Therefore, in addition to the tape drawing means for winding the tape around the cylinder, an auxiliary tape drawing means is required.

By the way, Japanese Laid-Open Patent Publication No. Sho 59-1.
As shown in FIG. 5 of No. 13563 (G11B 15/66), a pair of pullout arms 5 and 5 are rotatably attached to the first support shafts 4 and 4. A pinch roller 41 for running the tape is mounted on one end of a lever 41 pivotally supported by another fifth support shaft 24.

[0004]

In the above structure, the mechanism for driving both the arm and the lever becomes complicated.
Recently, a technology for fast-forwarding (FF) or rewinding (REW) the tape at high speed is being developed for a small VTR, but in a digital VTR with a thin tape (7 μm), FF / REW is used. In the mode, the tape fluctuates in the width direction and slides on the guide flange portion, the contact resistance increases, and the tape edge is easily damaged.

The present invention provides a tape guide mechanism for stably running the tape even during high speed FF / REW of the VTR, and contributes to downsizing of the device.

[0006]

Therefore, in the present invention, in a magnetic recording / reproducing apparatus for running a tape in a state where the tape is pulled out from a cassette and wound around a cylinder at a predetermined angle, a lever having an auxiliary tape guide for pulling out the tape is used. A pinch roller means on which a self-aligning pinch roller is placed, a crimping means for actuating the pinch roller means to crimp the pinch roller to a capstan shaft, and a pinch roller means at a position close to the capstan shaft. It comprises a first driving means for holding it and a second driving means for driving the pinch roller crimping means, always urges the pinch roller crimping means in a direction away from the capstan shaft, and operates the tape pulling means. After the tape is wound around the cylinder by means of the Performing a first mode of forming the running, so that the pinch roller by operation of the first and second drive means is pressed against the capstan executes the second mode to the constant-speed running of the tape.

[0007]

With the above-described structure, in the tape constant speed running (REC / PLAY) mode in which the pinch roller is in pressure contact with the capstan, the self-centering action of the pinch roller works and a uniform crimping force acts in the tape width direction to stabilize. The tape running can be achieved. Since the pinch roller separates from the capstan during FF / REW, the uniform force by the pinch roller does not act in the tape width direction, and the tape fluctuates in the width direction at the tape guide roller part before and after the pinch roller. By winding the pinch roller and running it, this non-uniform force is absorbed by the self-aligning action. Therefore, it is possible to suppress fluctuations in the tape width direction and perform stable FF / REW.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment will be described below with reference to the drawings. 1 is a plan view in the FF / REW mode, FIG. 2 is a plan view in the REC / PLAY mode, FIG. 3 is an external perspective view of the pinch lever assembly, and FIG. 4 is a sectional view of the pinch roller.

In FIG. 2, 1 is a cylinder, 2 is a chassis in which a pair of left and right guide grooves 2a, 2a and a protrusion (stopper) 2b are formed, and 3 and 3 are a pair of vertical posts 3 respectively.
a, a pair of left and right tape pull-out blocks having inclined posts 3b, a boss 3c of the tape pull-out block 3, and a boss (not shown) coaxial with the vertical post 3a are engaged with the guide groove 2a. 4 is a slide (first slide) provided with a pair of pins 4a, 4a, a long hole 4b and a pin (first engaging means) 4c, and 5 and 5 are pins 4a, 4a, respectively.
Is a pair of left and right crimping levers provided with elongated holes 5a, 5a engaged with. The crimping levers 5 and 5 rotate about shafts 2c and 2c on the chassis 2.

Reference numerals 6 and 6 are coaxial with the crimping levers 5 and 2c and 2c.
It is a pair of left and right links that rotate around c, engage with the bent pieces 5b, 5b of the crimp levers 5, 5, and the links 6, 6 and the crimp levers 5, 5 are torsion springs (only the right side in the figure). 26) and 26 (clockwise) (hereinafter abbreviated as CW) and counterclockwise (hereinafter CCW), respectively.
It will be abbreviated) and elastically rotate integrally.
7 and 7 are bosses 3c and 3c of the tape pull-out blocks 3 and 3.
And a pair of left and right links rotatably connected between one ends 6a, 6a of the links 6, 6.

Reference numeral 8 denotes a tape pull-out arm which is rotatable about a shaft 2d on the chassis 2 (in the drawing, only the supply side is shown,
The winding side is not shown), and the tape pull-out arm 8 is formed with bifurcated tongues 8a and 8b, and a tape guide 8c and a pin 8d are attached thereto. In the eject mode, the tongue piece 8a is the tape pull-out block 3 or
It is in contact with the vertical post 3a. Reference numeral 9 is a torsion spring that biases the tape pull-out arm 8 (figure numbers 3 to 9 constitute tape pull-out means).

Reference numeral 10 is a loading motor, 11 is a worm, and 12 is a worm gear 12a meshing with the worm 11.
And a gear 12b integrally formed, 13 is a relay gear, 14 is a cam follower pin 14a that engages with the long hole 4b of the slide 4, and a loading drive gear (first 1 is a gear), 15 is a mode switching gear having a cam groove 15a, which is rotatable with respect to the shaft 2e on the chassis 2 and meshed with the drive gear 14, and 16 is a long hole 16a through which the pin 33a is inserted and a pin (second pin). Slide lever (second slider) having engaging means) 16b
Is. Reference numeral 33 is a turning lever that has a pin 33a and a follow-up pin 33b and is pivotally supported by a shaft 2i of the chassis 2.

Reference numeral 17 is a pinch crimping lever having a notch groove 17a at one end, and 18 is a drive lever having a pin 18a at one end. The pinch crimping lever 17 and the drive lever 18 are rotatable coaxially with a shaft 2f on the chassis 2. And a torsion spring 19 for pinch roller crimping is suspended between the other ends of both levers 17 and 18,
Are urged in the directions away from each other (Fig.
Constitutes the pinch roller crimping means). 20 is a pinch roller 21 and a tape pull-out guide roller 22 at one end
, A cam portion 20a is formed at the other end, and a pinch lever (rotatably supported by a shaft 2h on the chassis 2 is pivotally supported by the shaft 2h (constitutes pinch roller means by the numbers 20 to 22), 23. Moves the pinch lever 20 counterclockwise (CCW)
A spring for urging the lever 24 is a capstan shaft.

As shown in FIG. 4, the pinch roller 21 using a radial ball bearing or the like receives the outer ring 28 of the ball bearing 27 at the step 26a of the roller 26 having the rubber roller 25 on the outer periphery and the inner ring 29 at the inner portion 29. It is assembled so that it can be received by the step portion 30a of the shaft 30 on the chassis 2. Sleeves 31, 32 are provided on the end faces of the outer ring 28 and the inner ring 29, respectively.
By fitting and fixing, the self-aligning type pinch roller 21 is completed.

Next, the operation of the present invention will be described. FIG.
Shows the FF / REW mode, but it is also the STOP mode. Now, when a cassette (not shown) is mounted, the loading motor 10 rotates, and the rotational driving force of the loading motor 10 is the worm 11 and the worm gear 12
It is transmitted to the loading drive gear 14 via a, the gear 12b, and the relay gear 13. At the time of tape loading, the drive gear 14 rotates to CCW, which causes the pin 14a to rotate.
Moves slide 4 from right to left. At this time, the crimp levers 5 and 5 and the links 6 and 6 are integrated into the shaft 2
Rotate to CW around c and 2c. By this rotation,
The tape pull-out blocks 3 and 3 move in the guide grooves 2a and 2a while pulling out the tape T, and wind the tape around the cylinder 1 at a predetermined angle.

During tape loading, the pair of tape pull-out blocks 3 and 3 move along the guide grooves 2a and 2a as described above. At this time, the tape pull-out arm 8 is biased to the CW by the torsion spring 9,
a is pushed by the tape pull-out block 3 and rotated to CCW. This position is the tape drawing-out completed state of the tape drawing arm 8, and the position of the tape guide 8c is defined here. That is, the tape guide 8c allows the tape T fed from the cassette or wound on a reel (not shown) in the cassette to run stably without contacting the wall of the cassette case. The travel route is regulated.

At the same time, when the slide 4 slides to the left, the pin 4c abuts on the cam portion 20a of the pinch lever 20, so that the pinch lever 20 rotates clockwise while expanding the tape T. Then, the capstan 10 is approached. Finally, the pin 4c of the slide lever 4 regulates the rotational position of the pinch lever 20 at the position shown in FIG. 1 where it abuts on the cam portion 20a of the pinch lever 20. In this state, a brake (not shown) is applied to both reel stands (not shown).
The tape T does not run because it is covered.

At the time of unloading, by rotating the loading motor 10 in the reverse direction, the tape pull-out blocks 3 and 3 move in the guide grooves 2a and 2a in the direction opposite to that at the time of loading. During the unloading, a part of the block 3, for example, the vertical post 3a is engaged with the tongue piece 8b of the tape withdrawing arm 8 and the tape withdrawing arm 8 is rotated to CW against the biasing force of the torsion spring 9. After that, the arm 8 is urged by the CW by the urging force of the torsion spring 9 to rotate to the eject position.

When the FF operation is performed from the STOP mode, the drive gear 14 slightly rotates to CW, but the slide 4 does not move, the brake of the reel stand is released, and the tape T runs at high speed (FIG. 1). At this time, the tape T is the pinch roller 21.
And the guide roller 22 are wound around and run (see FIG. 3).
reference). When the REW operation is performed, the drive gear 14 is rotated CCW, but the traveling path of the tape T is rewound at a high speed in the state of FIG. 1, that is, the tape T is wound around the pinch roller 21 and the guide roller 22.

When the PLAY operation is performed from the STOP mode, the drive gear 14 rotates to CCW and the mode switching gear 15 rotates to CW. Along with this, the slide 4 does not slide, but the slide lever 16 does not move the C of the turning lever 33.
With the rotation to W, it slides to the right in the drawing to reach the state of FIG. By the movement of the slide lever 16, the pinch crimping lever 17 engaged with the pin 16b is rotated to CW. Therefore, the drive lever 18 also rotates to CW, and the pin 18a presses the cam portion 20a of the pinch lever 20, so that the pinch roller 21 is pressed against the capstan 24 with the tape T in between. In this state, the capstan shaft 24 runs the tape T at a predetermined speed.

The pinch roller of the present invention is of the self-aligning type as described above. Therefore, the ball bearing 27
Since a clearance is provided between the inner ring 29 and the outer ring 28 of the cap bearing via the ball bearing 27, a degree of freedom of inclination is provided between the shaft 30 and the roller 26, and the capstan shaft 24 is provided to the capstan shaft 24 in the PLAY state. On the other hand, the pinch roller 21 has an automatic centering action. Therefore, a uniform pressing force is applied in the width direction of the tape T, and stable tape running can be achieved.

During FF / REW, since the tape T is disengaged from the capstan shaft 24, a uniform force is not applied in the tape width direction, and the tape T fluctuates in the width direction between the vertical post 3a and the guide roller 22. Here, by winding the tape T around the pinch roller 21 and running the tape T, the nonuniform force is absorbed by the self-aligning action to suppress the variation in the width direction, and stable FF / REW is possible.

[0023]

As described above, according to the present invention, high-speed FF /
The tape can be stably run in the REW mode, which is effective as a tape guide mechanism having a simple structure for downsizing the VTR.

[Brief description of drawings]

FIG. 1 is a plan view in FF / REW mode.

FIG. 2 is a plan view in a REC / PLAY mode.

FIG. 3 is an external perspective view of a pinch lever assembly.

FIG. 4 is a sectional view of a pinch roller.

[Explanation of symbols]

 3 tape pull-out block 4 slider (first slider) 14 loading drive gear (first gear) 15 mode switching gear (second gear) 16 slide lever (second slider) 17 pinch crimp lever 18 drive lever 20 pinch Lever 21 Self-aligning pinch roller

Claims (6)

[Claims] 1. A pinch roller in which a tape pull-out means for pulling out a tape from a cassette and winding it around a cylinder at a predetermined angle and a self-aligning type pinch roller for driving the tape by pressing it against a capstan shaft are rotatably mounted. Means and
Pinch roller crimping means for actuating the pinch roller means to crimp the pinch roller onto the capstan shaft;
First driving means transmitted from a driving source through a speed reducing means and holding the pinch roller means in a position close to the capstan shaft; and driving the pinch roller crimping means transmitted from a driving source through the speed reducing means. Second driving means for constantly pressing the pinch roller pressing means in a direction away from the capstan shaft and winding the tape around the cylinder by the operation of the tape pulling means. When the driving means is operated, the first mode in which the tape is run while the tape is wound around the pinch roller is executed, and the pinch roller is moved to the capstan by the operation of the first and second driving means. A magnetic recording / reproducing apparatus characterized by executing a second mode in which the tape is pressed and the tape is run. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the first mode is a tape fast-forwarding or tape rewinding mode, and the second mode is a tape recording or tape reproducing mode. . 3. The first driving means comprises a first gear that is rotationally driven through a speed reducing means, and a first slider that slides following the first gear. 3. The magnetic recording / reproducing apparatus according to claim 1, further comprising a first engaging unit that engages with the pinch roller unit. 4. The second drive means comprises a second gear meshed with the first gear and a second slider that slides following the second drive gear. 4. The magnetic recording / reproducing apparatus according to claim 1, further comprising a second engaging unit that engages with the pinch roller pressing unit. 5. The pinch roller means has a self-aligning pinch roller at one end, and a guide roller fixed to the pinch roller close to the pinch roller, and a cam at the other end that engages with the first engaging means. 5. The magnetic recording / reproducing apparatus according to claim 1, further comprising a section. 6. The magnetic recording / reproducing apparatus according to claim 3, wherein the first and second engaging means are pins fixedly implanted in the first and second sliders, respectively.