JP3389381B2 - Magnetic recording / reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-small video tape recorder for 8 mm video, digital video, etc.
The present invention relates to a tape pull-out mechanism suitable for a VTR.

[0002]

2. Description of the Related Art In recent years, miniaturization of VTRs has progressed, and a new standard VTR called a digital VTR has been developed. The cassette for this digital VTR is an 8 mm VTR
Similarly to the above, the tape guide roller near the opening of the cassette is omitted for downsizing. Therefore, the tape cannot be run when the tape is completely stored in the cassette. Therefore, in addition to the tape pull-out means for winding the tape around the cylinder,
Requires one sub-tape withdrawal means.

The applicant previously applied for a simple tape pull-out drive mechanism as shown in FIG. 5 in Japanese Patent Application No. 6-97644. FIG. 5 shows the tape loading completion state, and the outline of the operation will be described. When a play set operation is performed by mounting a car set (not shown), the loading motor 10 rotates, and the rotational driving force of the motor 10 passes through the worm 11, the worm gear 12a, the gear 12b, and the relay gear 13 to the cam gear. 14 is transmitted. At the time of tape loading, the cam gear 14 rotates counterclockwise (CCW), and the cam follower pin 14a moves the slide 4 from the right side to the left side in the drawing. At this time, the crimping levers 5 and 5 and the links 6 and 6 are integrated to form the shafts 2c and 2
Rotate clockwise (CW) around c.

By this rotation, the tape pull-out blocks 3 and 3 connected to the link 6 via the link 7 move in the guide grooves 2a, 2a while pulling out the tape T. One of the tongue pieces 8a is pushed by the block 3 and rotated to CCW to spread the tape T by the tape guide 8c. Arm 8 at this time
Since the pin 8d is located at the bent piece 9a of the torsion spring 9, the arm 8 is held at the position shown in the figure. on the other hand,
By moving the pin 4c of the slide 4 to the left, the pinch roller arm 18 rotates to CW and the tape T is expanded by the tape guide 18b. After that, the tape T is pulled out by the tape pull-out blocks 3 and 3, and the tape T is wound over a predetermined angle of the cylinder 1.

[0005]

In the tape loading mechanism of the conventional example as described above in the subsequent examination, the tape loading arm 8 and the tape loading block 3 are connected between the tape pulling arm 8 and the tape pulling block 3 at the time of completion of the tape loading and during the loading / unloading. Since a two-dimensional gap is created, when an unexpectedly high tape tension is generated in the tape more than necessary, the position of pull-out arm 8 cannot be maintained by the urging force of torsion spring 9 alone, and pull-out arm 8 cannot be moved to CW. It turns out that there is a concern that the mechanism will not return to normal operation by turning to. The present invention solves the above-mentioned problems and provides a tape pull-out drive mechanism that does not become complicated due to the miniaturization of a VTR.

[0006]

Therefore, according to the present invention, in a magnetic recording / reproducing apparatus for pulling out a tape from a cassette and winding it around a cylinder at a predetermined angle to record / reproduce information, a tape guide is provided and one of the two-pronged protrusions is provided. The tape in the guide groove of the chassis, and the first tape pull-out means for pulling the tape out of the cassette and expanding the tape, and the first tape pull-out means when the tape is stored in the cassette. A first urging means for urging the tape in the tape pull-out direction after the tape is pulled out;
First stopper means for defining the first tape pull-out means in the tape pull-out position in cooperation with the urging means of the first tape, and the guide groove for moving the first tape pull-out means to engage with the first tape pull-out means. A second tape pull-out means for winding the tape around the cylinder after rotating the pull-out means against the first biasing means to the tape pull-out position, and a slide body for driving the second tape pull-out means, The second stopper means is interlocked with the movement of the slide body, and a cam gear for moving the slide body by the driving force of the drive source. The second stopper means is the first stopper as the slide body moves. The first tape pull-out means is temporarily fixed and held in the tape pull-out position in cooperation with the means.

The first biasing means is a torsion spring. The first stopper means is a protrusion on the chassis. Further, the second stopper means is composed of a rotating lever having one end projected into the moving passage of the slide body and the other end having a bending piece for preventing the rotation of the first tape pulling-out means.

With the above structure, unexpectedly high tape tension is applied to the tape, and even if a load is applied to the tape pull-out arm, it is clamped by the first and second stopper means, so that the tape pull-out arm is Since it does not rotate, the normal tape running path is maintained, and the subsequent operation of the mechanism is not hindered.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the drawings. 1 is a plan view of a tape loading completed state, FIG. 2 is a plan view of an eject mode, FIG. 3 is a plan view of a main part in the eject mode, and FIG. is there. In the figure, the same parts as those in the conventional example are designated by the same reference numerals and the description thereof is partially omitted.

1 and 2, 2 is a chassis having a pair of left and right guide grooves 2a, 2a and a projection (stopper means) 2b, and 3 and 3 are a pair of vertical posts 3a, respectively.
A pair of left and right tape pull-out blocks (second tape pull-out means) provided with inclined posts 3b, a boss 3c of the tape pull-out block 3, and a boss 3 coaxial with the vertical post 3a.
d is engaged with the guide groove 2a. 4 is a pair of pins 4a,
4a and a long hole 4b, and slides provided with operating pins 4c and 4d (which penetrate into the long hole 2f of the chassis 2), 5 and 5 are long holes 5a, to which the pins 4a and 4a are engaged, respectively. 5a is a pair of left and right crimping levers provided with 5a.
The crimp levers 5, 5 and the links 6, 6 are
5 is engaged with the bent pieces 5b, 5b, and the links 6, 6
The pressure-bonding levers 5 and 5 are elastically unitarily rotated by being urged to CW and CCW by a torsion spring (not shown), respectively. 7 and 7 are tape pull-out blocks 3 and 3
The left and right links are rotatably connected between the bosses 3c, 3c and the ends 6a, 6a of the links 6, 6. The tape withdrawing blocks 3 and 3, the pressure bonding levers 5 and 5, the links 6 and 6, and the links 7 and 7 constitute second tape withdrawing means 3 and 3, respectively.

Reference numeral 8 denotes a tape pull-out arm which is rotatable about an axis 2d on the chassis 2 which constitutes the first tape pull-out means. The tape pull-out arm 8 has a bifurcated tongue piece 8a. And 8b are formed, and the tape guide 8c and the pin 8d are attached. The tongue piece 8a is in contact with the tape pull-out block 3 or the vertical post 3a in the eject mode. 9 is a tape pull-out arm 8
It is a torsion spring that biases.

Reference numeral 14 denotes a cam gear to which a cam follower pin 14a engaging with the elongated hole 4b of the slide 4 is attached, 15 a stop lever rotatable about a shaft 2e on the chassis 2, and 16 a stop lever 15 at one end. The stop lever 15 by contacting the pin 2g of the chassis 2 with the other end.
The pinch roller arm 18 is urged to the CCW by the spring 17 and is rotatable about the shaft 2h on the chassis 2. The pinch roller arm 18 includes the pinch roller 1
8a and a tape guide 18b are placed. Reference numeral 19 is a supply reel base, 20 is a take-up reel base, and 21 is a capstan.

Next, the operation of the present invention will be described. Figure 2
In the eject mode of No. 3, when the cassette (not shown) is mounted and the play operation is performed, the loading motor 10
Rotates, and the rotational driving force of the loading motor 10 is
It is transmitted to the cam gear 14 via the worm 11, the worm gear 12a, the gear 12b, and the relay gear 13. During tape loading, the cam gear 14 rotates CCW, and the cam follower pin 14a moves the slide 4 from the right side to the left side in the drawing. At this time, crimp levers 5, 5
Then, the links 6 and 6 integrally rotate about the shafts 2c and 2c to CW. By this rotation, the tape pull-out blocks 3 and 3 pull out the tape T and guide grooves 2a and 2a.
To move. Due to the movement of the block 3, the tongue piece 8a of the arm 8 is pushed, the arm 8 rotates against the urging force of the torsion spring 9 while rotating the tape T to CCW, and abuts on the stopper 2b. The movement of the slide 4 to the left causes the operating pin 4d to abut against one piece 15a of the stop lever 15, rotate the stop lever 15 to CW against the bias of the spring 16, and bend the other end 15b. To the tongue 8f of the arm 8. At this point, the arm 8 is biased toward the CCW by the torsion spring 9, and the tape guide 8c is held at the position shown in FIG. On the other hand, pinch roller arm 1
8 also turns to CW by the operating pin 4c to spread the tape T. Subsequently, the tape pull-out blocks 3 and 3 pull out the tape T further, wind the tape T over a predetermined angle of the cylinder 1, and reach the tape loading completion state of FIG.

Next, the stop lever 15 according to the present invention.
The operation will be described in detail with reference to FIGS. 3 and 4. At the time of ejecting in FIG. 3, the stop lever 15 is urged toward the CCW by the spring 16, and the piece 15a is in the movement path of the operating pin 4d and is in a position where it abuts and engages with the operating pin 4d. As the slide 4 moves from right to left, the stop lever 15 rotates to CW, and the tongue piece 8 of the arm 8 moves.
The bent piece 15b moves to a position facing f, and this state is maintained until the loading is completed. Therefore, even when an unexpectedly high tension is applied during the tape loading and when the loading is completed and an external force is applied to rotate the arm 8 to the CW, the tongue 8f is bent by the bent piece 15b.
To prevent the arm 8 from rotating toward the CW (see FIG. 4). When the pin 8d of the arm 8 is located on the left side of the Y axis in FIG. 3, the torsion spring 9 causes the arm 8 to move.
Is urged to CCW, and when it is located on the right side, it is urged to CW.

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, 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 pull-out arm 8 and the tape pull-out arm 8 is rotated to CW against the biasing force of the torsion spring 9. . Here, the tongue piece 8b and the vertical post 3a are always in the engaged state within the rotation range up to the position where the pin 8d of the tape pull-out arm 8 exceeds the Y axis. The pin 8d of the tape pull-out arm 8 is Y
When the arm 8 crosses the axis, the arm 8
The CW is urged by the urging force of to rotate to the eject position.

[0016]

As described above, according to the constitution of the present invention,
With the simple structure, the position of the tape sub-drawing arm that pulls out a small amount of tape from the cassette can be surely regulated during the tape loading, and the position of the tape guide near the cassette opening can be accurately defined.

[Brief description of drawings]

FIG. 1 is a plan view of a tape loading completed state.

FIG. 2 is a plan view of an eject mode.

FIG. 3 is a plan view of a main part in an eject mode.

FIG. 4 is a plan view of a main portion of a first tape pull-out means in an operating state.

FIG. 5 is a plan view of a conventional tape loading completion state.

[Explanation of symbols]

2b stopper (projection) 3 tape pull-out block (second tape pull-out means) 4 slide 4d operating pin 8 tape pull-out arm (first tape pull-out means) 9 torsion spring (biasing means) 14 cam gear (driving means) 15 stop Lever 16 spring

Claims (4)

(57) [Claims] 1. A magnetic recording / reproducing apparatus for recording / reproducing information by pulling a tape from a cassette and winding the tape around a cylinder at a predetermined angle, wherein a tape guide is provided, and one of the bifurcated protrusions is projected into a guide groove of a chassis. A first tape pull-out means for pulling the tape out of the cassette and expanding the tape; and when the tape is stored in the cassette, the first tape pull-out means is urged in the tape storing direction. A first urging means for urging the tape in the tape withdrawing direction after the tape is withdrawn, and a first stopper means for cooperating with the first urging means to define the first tape withdrawing means at the tape withdrawing position. , Moving in the guide groove to engage with the first tape pulling-out means, and rotating the first tape pulling-out means to the tape pulling-out position against the first biasing means. After that, second tape pull-out means for winding the tape around the cylinder, a slide body for driving the second tape pull-out means, second stopper means for interlocking with the movement of the slide body, and a driving force of a drive source. And a cam gear for moving the slide body by means of which the second stopper means cooperates with the first stopper means to move the first tape pull-out means to the tape pull-out position. A magnetic recording / reproducing device characterized by being temporarily fixed and held. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the first biasing means is a torsion spring. 3. The magnetic recording / reproducing apparatus according to claim 1, wherein the first stopper means is a protrusion on the chassis. 4. The rotation means, wherein the second stopper means has one end projected into a movement passage of the slide body and the other end provided with a bending piece for preventing rotation of the first tape pull-out means. The magnetic recording / reproducing apparatus according to claim 1, which is a lever.