JPH01105351A - Video tape recorder - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to simplify a loading mechanism by fitting tape guide members to a belt of an elastic body and pressing the guide members against receiving parts by the belt tension on completion of loading a tape. CONSTITUTION:The belt 55 is constituted of an endless rubber belt, to which the tape guide members 50, 51 and 52 are fitted, and individual guide pins are inserted into upper and lower guide grooves (53) and 54 to be guided. The belt 55 is stretched around pulleys 56A-56I and driven by a driving motor 57. Now, when the belt 55 is driven anticlockwise, the tape is drawn from a cassette by the leading guide pin 50A to form a prescribed traveling course. Then, on completion of loading, the individual blocks 50-52 are pressed against the prescribed receiving parts by the belt tension. Consequently, the conventional complicated parts are reduced, thus simplifying the loading mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video tape recorder (VTR), and more particularly to a video tape recorder having an improved tape loading mechanism for winding a video tape around a rotating head drum.

[Conventional technology]

Generally, a tape loading mechanism that pulls out a tape from a video cassette and attaches it to a rotating head drum includes a U loading mechanism that pulls out the tape with a single pin and winds it around the rotating head drum in sequence, and a U loading mechanism that uses two pins to load the tape simultaneously. It uses an M loading mechanism that is attached to the rotating pull-out head drum.

Conventionally, these loading mechanisms perform loading and unroping ink by rotating a loading ring or a loading arm provided with a tape guide member in forward and reverse directions.

The tape guide member is attached to the loading ring or the loading arm via a spring, and when loading the tape, the spring presses the tape guide member against the fixed member to prevent the tape guide member from changing its position. ing.

[Problem that the invention seeks to solve]

However, the tape loading mechanism of the conventional video tape recorder described above has a double structure in which the tape guide member is attached to the loading ring or loading arm with a spring intervening, which means that the structure is complex and has a large number of parts. There was a problem.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a video tape recorder in which the structure of the tape loading mechanism is simplified and the number of parts can be reduced.

[Means for solving problems]

In order to achieve the above object, the present invention provides a video tape recorder in which a chive guide member is attached to a belt, and the tape guide member is moved by the belt to wind the video tape around a rotating head drum, the belt being made of an elastic body. The present invention is characterized in that, after tape loading, the tape guide member is elastically pressed against the receiver at a predetermined position by the tension of the belt.

[Effect]

According to the present invention, since the tape guide member is moved by an elastic belt, by applying a certain tension to the belt after loading the tape, the tape guide member is moved at a predetermined position with elasticity at the receiving portion. The tape guide member can be pressed and biased, thereby preventing the tape guide member from changing its position.

〔Example〕

Preferred embodiments of the video tape recorder according to the present invention will be described in detail below with reference to the accompanying drawings.

First, the structure of a video cassette applied to an embodiment of the present invention will be explained. FIGS. 14A and 14B are perspective views of the 8 mm video cassette in the closed and open states, respectively, and FIG. 15 is a bottom view of the 8 mm video cassette.

As shown in these drawings, the cassette 10 has reels 11, 11 rotatably housed in a cassette body 10A, and a videotape 12 is wound around these reels 11, 11.

Further, the cassette main body 10A is provided with a front lid 10B that opens and closes by rotating around a support shaft 13, and this front lid 10B is configured so that the tape on the front of the cassette is not exposed when opened. A lever 14 is disposed on the side of the cassette body 10A, and when the lever 14 moves in the direction of arrow A, the front lid 10B is unlocked and can be opened. The front lid 10B is biased by a spring in the closing direction, and a window 15 for detecting a tape end is provided on the side surface of the front lid 10B, which matches a hole (not shown) in the cassette body 10A when opened. It is provided.

Further, on the bottom of the cassette 10, as shown in FIG.
6C and 16D are drilled, and a pair of left and right holes among these positioning holes are used for actual cassette positioning.

Further, 17 is a hole into which a light emitting element for tape end detection is inserted, and 18A to 18F are tape information (magnetic recording,
This is a hole that can be opened and closed or opened as necessary to determine whether erasing is possible, the type of tape, etc. still,
The hole 18A indicates that magnetic recording and erasing is not possible when it is open, and indicates that magnetic recording and erasing are possible when it is closed. Furthermore, 19 is a lever for stopping the reel 11.11, which is movably provided in the hole 19A, and when moved in the direction of arrow B, the brake is released. Also, the IO indicated by diagonal lines
C is a cassette mouth portion into which a tape guide for tape loading, etc., which will be described later, is inserted when the cassette 10 is attached to the main body of the apparatus.

This type of cassette is configured to be inserted into the cassette holder with the front cover facing forward, and the cassette 10 is
As shown in Figure 5, a gap C is provided between the cassette main body IOA and the front lid 10B, and when the cassette 10 is inserted into the cassette holder with the front lid 10B facing forward, the lock release member disposed on the cassette holder is released. Entering from the gap C,
The front lid 10B is unlocked by moving the lever 14 in the direction of arrow A.

Now, FIG. 2 is an external view of a camera-integrated VTR to which the video tape recorder according to the present invention is applied, and FIG. 3 is a perspective view of its interior.

As shown in these drawings, this camera-integrated VTR includes a main body 20 containing a cassette 10 and a rotary head drum 22 for magnetically recording and reproducing video tape.
In addition to having a TR section, a photographic lens 24 as a video camera section, a CCD image pickup device 26, and a finder 28 are provided, and a grip 32 housing a battery 30 at the bottom thereof is integrally provided with the main body 20. Note that 34 is a circuit board on which electronic components for controlling the VTR section and the video camera section are mounted.

FIG. 1 is a perspective view showing a mechanical section of the VTR section, and FIG. 4 is a perspective view showing a state in which a cassette holder 36 is further attached.

The cassette holder 36 positions the cassette 10 housed within the holder at a predetermined position on the main body 20 when the holder is closed. This cassette holder 36 is provided with two windows 36A and 36B as shown in FIGS. 2 and 4. The window 36A is for checking the remaining amount of tape in the cassette 10, and the window 36B is for checking the back label IO of the cassette 10.
This is for viewing the re-recordability display label IOE.

Further, as shown in FIG. 5, the cassette holder 36 is rotatably disposed on the main body 20 via a hinge fulcrum 36C. Here, the hinge fulcrum 36A is disposed near the rear end of the cassette holder 36, and the cassette 10
As shown in the figure, it is inserted into the cassette holder 36 from the rear side opposite to the front lid 10B. The reason why the hinge fulcrum 36C of the cassette holder 36 and the insertion direction of the cassette 10 are reversed from those of conventional general hinge-type cassette holders is that the cassette mouth portion 10C (first
This is to ensure that the radius of rotation shown in Figure 5) is large so that the tape guide member and the like that pull out the tape from the cassette 10 during tape loading can easily enter the cassette mouth portion 10C.

Next, a description will be given of a lock release mechanism that can unlock the front lid even when the cassette is inserted into the cassette holder from the rear side opposite to the front lid.

This lock release mechanism is operated by a wire spring 38 as shown in FIG.
It is made up of. This wire spring 38 has a claw portion 38A for unlocking bent at its tip, and the cassette holder is supported on the lower surface of the member 36D by a retaining pin 39 and a presser member 40 at its rear end and center, respectively.

The tip claw portion 38A of the wire spring 38 elastically protrudes into the holder from the opening 36E of the cassette receiver member 36D.

The operation of this lock release mechanism will be explained with reference to FIGS. 5(A) to 5(C). First, as shown in FIG. 5(A), when the cassette 10 is inserted into the cassette holder 36 from the rear side, the claw portion 38A of the wire spring 38 is pushed down by the back and bottom surface of the cassette 10 as shown by the double-dashed line.

Then, when the cassette 10 is inserted to the position shown in FIG. 5(B), the claw portion 38A once drops to the right side of the lever 14. In this state, when the cassette 10 is further inserted, the claw portion 3
8A is pushed down again by the lever 14, and the claw part 38
When A gets over the lever 14, the lever 14 is moved in the direction of the arrow A by the inclined portion of the claw portion 38A, as shown in FIG. 5(C), and the front cover 10B is unlocked.

When the cassette holder 36 is closed, the front cover opening pin 41 disposed on the main body side moves relatively in the direction of the arrow.
The front lid 10B is opened.

When the cassette holder 36 is closed as described above, the cassette 10 in the cassette holder 36 is inserted into the positioning hole 16A.
and 16B (Fig. 15) is the subchassis 62 (Fig. 1,
Fig. 9) Cassette positioning pin 42A implanted above,
42B and positioned. Further, the rotational shafts of the supply reel stand 43 and the take-up reel stand 44 shown in FIG.
inserted into.

Now, as is clear from Figure 1, the rotating head drum 2
2 is disposed laterally to the cassette 10 mounted on the reel stand 43, 44, and is equipped with various mechanisms described below for loading tape onto the rotary head drum 22.

In FIG. 1, reference numeral 47 is an auxiliary tape guide made of an elastic member fixed to the sub-chassis 62, and guides the tape pulled out from the supply reel side during tape loading. That is, the auxiliary tape guide 47 is located inside the wall of the tape entrance on the supply reel side of the cassette 10, as shown in FIG.
It is designed so that it can be retracted with elasticity when it is attached or detached.

Next, each member that moves during tape loading and an outline of their movement will be explained.

FIG. 6(A) shows the state before the cassette 10 is installed and tape loading is started. In the same figure, 50, 51, and 52 are tape guide blocks, and the guide block 50 is a guide pin 50A, 50B.
The guide block 51 has guide pins 51A, 51
B, and the guide block 52 has a guide pin 52A. These tape guide blocks 50.51.
52, each guide pin is located at a corresponding position in the cassette mouth portion 10C before tape loading, and after tape loading, each guide pin is positioned along the guide groove 54 in FIG. 6 (B).
) to (D>).

Here, 64 is a winding tape guide, and 80 is a tension regulator pin, which are rotatably provided around fulcrums 64A and 81A, respectively. Reference numeral 70 denotes a pinch roller, which is provided so as to be movable up and down in a direction perpendicular to the plane of the paper in FIG. 6, and to be rotatable about a fulcrum 75A. Further, 90A and 90B are an inlet slant pin and an outlet slant pin, each of which is provided so as to be tiltable. Note that 68A and 68B are an entrance guide roller and an exit guide roller, and 69 is a capstan.

Next, the tape loading operation will be explained.

First, before tape loading, as shown in FIG.
The tension regulator pin 80 is in a position retracted from the guide groove 54.

Further, the pinch roller 70 has been retracted to an upper position, and the slant pins 90A and 90B have also fallen down and retracted from the tape running section.

When the tape loading operation is started from the above state, as shown in FIG. 6(B), the tape guide block 50.5 is
1.52 guide pins (especially the first guide pin 50A)
), the tape is pulled out from inside the cassette 10 and wound around the rotating head drum 22.

Incidentally, at the same time as the tape guide block starts to move, the take-up tape guide 64 rotates clockwise about the fulcrum 64A.

Next, after the tape guide blocks 50, 51, and 52 have finished moving, the pinch roller 70 moves downward and the slant pins 90Δ and 90B rise (Fig. 6(C)).
), then the pinch roller 70 rotates counterclockwise around the fulcrum 75A to press the capstan 69, and the tension regulator pin 80 rotates clockwise around the fulcrum 81A to tighten the tape. It comes to a position where the tension can be adjusted (Fig. 6(D)).

This completes the loading operation and enables magnetic recording and reproduction on the video tape.

[Tape guide block moving mechanism]

Next, a mechanism for moving the tape guide block and the like will be explained.

FIGS. 7(A) and 7(B) are perspective views showing one embodiment of a tape guide block moving mechanism, respectively, and FIGS.
> indicates the state before tape loading, and (B) in the same figure shows the state after tape loading. This movement mechanism is
Upper and lower guide grooves 53.54 (8th
(Fig. 9) and tape guide block 50.51.5
A belt 55 with a Boo! 2 arranged thereon and a Boo! 156A to 56r,
A belt drive motor 57 and a gear train 5 for transmitting the rotational force of the belt drive motor 57 to the boot IJ 56A.
It consists of 8.

The upper and lower guide grooves 53 and 54 are formed in the main chassis 60 and the sub-chassis 62 as shown in FIGS. 8 and 9, and the lower guide groove 54 is formed in the cassette mouth portion 10C as shown in FIG. It has a folding path at a position corresponding to
It has guide grooves 54G and 54D that branch toward A and 54B (FIGS. 8 and 9). Also, the upper guide groove 5
3 is formed only on the main chassis 60 as shown in FIG. 8, and pin receivers 53Δ, 53B are formed at the moving end to guide each guide pin of the tape guide block 501, 51, 52 at least in the loading state. or can be retained. Note that the rotary head drum 22, capstan 69, etc. are attached to the main chassis 60.

The belt 55 is an elastic endless belt, such as a rubber belt, and the guide blocks 50, 51, 52
is installed. The guide blocks 50, 51, 52 extend the tape loop during tape loading and form a tape running path from the capstan 69 to the take-up reel, as shown in FIG.
A plurality of guide blocks (three in this embodiment) must be provided at regular intervals, and such a plurality of guide blocks 50.
5L52 is cassette mouse part 1 before tape loading
Must be located within 0C.

Therefore, the belt 55 is folded back in a hairpin shape at the cassette mouse section 10C, and the plurality of guide plotters 50.
51 and 52 are secured. The route of the guide groove 54 described above (particularly the route within the cassette mouth portion 10C) is determined for the above reason. Further, in the guide block 50, only the guide pin 50B is disposed on the belt 55, and the guide pin 50B is disposed on the belt 55.
As shown in FIG. 7(B), A is rotatably provided around a guide pin 50B.

On the other hand, the belt drive motor 57 has a worm 5 on its drive shaft.
7A is attached, and this worm 57 meshes with a worm wheel 58A of a gear train 58. A gear is integrally provided on the lower surface of the worm wheel 58Δ, and this gear meshes with the gear 58B. Similarly, gear 58B is integrally provided with a gear on its lower surface, and this gear meshes with gear 58C, which in turn meshes with gear 58D coaxial with Boo'J 56A.

Therefore, the rotational driving force of the belt drive motor 57 is transmitted through the gear train 58. The belt 55 moves as the J56A rotates,
At the same time, the guide plotter 50.51.52 also moves.

Next, the operation of the tape guide block moving mechanism will be explained.

Now, when the belt 55 is moved counterclockwise from the state shown in FIG. 7(A), the leading guide pin 50A pulls out the tape from inside the cassette 10, and the subsequent guide pins form a running path for the tape. (See Figure 6). The shaft portion 50C (FIG. 7(B)) guided by the lower guide groove 54 of the guide pin 50A is connected to the belt 55.
Since the belt 55 is located inside the belt, appropriate processing is performed to prevent the belt 55 from coming off when riding on each pulley.

When the belt 55 moves counterclockwise and the leading guide pin 50A reaches the branching part at the tip of the guide groove 54, the guide pin 50A is constantly receiving a reaction force from the belt 55 in the inward direction of the belt 55. Therefore, the belt 55 moves along the guide groove 54C branching inward from the running direction of the belt 55. On the other hand, since the guide pin 50B is disposed on the belt 55, it moves along the running direction of the belt 55, that is, along the guide groove 54D.

As a result, the leading end of the tape is expanded, and the pinch roller 70 and slant pin 90B can be inserted into the tape loop.

In addition, the guide pins 50Δ and 50 of the guide block 50
B is the upper and lower pin holder parts 53A, 154A and 53, respectively.
When the belt 55 comes into contact with B and 54B and a predetermined tension is generated in the belt 55, the movement of the belt 55 is stopped. At this time, since the belt 55 is elastic, it stretches, and the guide pin is brought into contact with the pin receiver due to the tension of the belt 55, so that the guide pin is accurately positioned on the pin receiver.

In addition, as shown in FIG. 10, the groove width of the guide 459 is changed for each positioning portion of each guide block 51, 52, and the diameter of the shaft portion 51C of the guide block 51 and the shaft portion 52B of the guide block 52 is changed according to the groove width. By matching the widths, the guide blocks 51 and 52 can be positioned accurately. However, in this case, the tension of the belt 55 gradually weakens as each block is opened.

Next, a mechanism for moving the take-up tape guide 64 will be explained. As shown in FIGS. 7(A) and 7(B), the winding tape guide 64 is rotatably provided around a fulcrum 64A, and a fan-shaped gear 64B around the fulcrum 64A is integrally formed with the winding tape guide 64. It is set in.

On the other hand, a slide member 65 is provided so as to be movable in the directions of arrows A and B, and this slide member 65 has a rack 65A and a guide block 5 at its tip that mesh with the fan-shaped gear 64B.
A hook 65B is formed to engage with the second guide pin 52A. Further, the slide member 65 is biased in the direction of the arrow by a spring 66.

Therefore, in the state shown in FIG. 7(A), the hook 65B of the slide member 65 engages with the guide pin 52Δ, and the slide member 65 is returned in the direction of arrow B against the biasing force of the spring 66. As a result, the winding tape guide 64 is located within the cassette mouth portion 10C (see FIG. 6(A)).

When the guide pin 52A starts to move from this state by the belt 55, the engagement of the hook 65B is released and the slide member 65 moves in the direction of the arrow by the biasing force of the spring 66. As a result, the rack 65 of the slide member 65
The rotational force is transmitted through the gear 64B of the A1 take-up tape guide 64, and the take-up tape guide 64 rotates to a position where it comes into contact with the stopper 67.

[Moving mechanism such as pinch rollers]

Next, a mechanism for moving the pinch rollers and the like will be explained.

FIGS. 11(A) to 11(C) are perspective views showing one embodiment of a moving mechanism such as a pinch roller, and FIG. 11(A) shows the state before the movement starts, and FIG. The recording/reproducing state is shown, and (C) of the same figure shows the temporarily stopped state of magnetic recording/reproducing.

This pinch roller movement mechanism includes a main cam 72 (FIG. 1) that rotates from a mode motor 71 via a gear 71A and a gear 72A on the outer periphery of the main cam 72, and a gear 73 that meshes with the gear 72A on the outer periphery of the main cam 72. , a cylindrical cam 74 provided coaxially with the gear 73, and a cylindrical cam 74 that is rotatable about a shaft 75B between the gear 73 and the cylindrical cam 74, and is engaged with the cam groove 72B of the main cam 72 at one end thereof. A pinch roller arm 75 having a cam follower T5A and a pinch roller crimping arm whose cam follower engages with the cam groove 74A of the cylindrical cam 74 and which is guided movably in the vertical direction at the tip of the pinch roller arm 75. It consists of 76.

Here, the cam groove 72B of the main cam 72 is designed to hold the cam follower 75A of the pinch roller arm 75 on the same radius by a certain angle, then move the cam follower 75A of the pinch roller arm 75 toward the outer circumference along the edges, and finally move it toward the center. is formed. Also,
The cam groove 74'A of the cylindrical cam 74 is formed so that the pinch roller pressing arm 76 is moved downward at first and then held at a constant height.

Next, the action of the pinch roller moving mechanism is shown in Figure 11 (
This will be explained with reference to A) to (C).

First, as shown in FIG. 11(A), the pinch roller 70 is located upward, and the pinch roller arm 75 is located at the end of rotation in the clockwise direction. As described above, when the tape guide block movement mechanism finishes pulling out the tape, the mode motor 71 is driven, the main cam 72 is rotated counterclockwise, and the cylindrical cam 74 is rotated clockwise via the gear 73. rotate in the direction.

At this time, since the cam grooves 72B of the main cam 72 are on the same circumference by a certain angle, the pinch roller arm 75 does not rotate, and only the pinch roller crimping arm 76 descends along the cam groove 74A of the cylindrical cam 74. Pinch roller 70
is inserted into the tape loop.

When the main cam 72 further rotates counterclockwise from this state, the main cam 72 rotates as shown in FIG. 11(B).
The cam follower 75A of the pinch roller arm 75 moves toward the outer circumference of the main cam 72 by the cam groove 72B.

As a result, the pinch roller arm 75 rotates counterclockwise around the shaft 75B, and the pinch roller 70 is pressed against the capstan 69, making it possible to magnetically record and reproduce the tape (FIG. 6(D)). reference). Note that at this time, the pinch roller 70 is not moved up and down by the cylindrical cam 74.

When the main cam 72 further rotates counterclockwise from the state shown in FIG. 11(B), the cam follower 75A of the pinch roller arm 75 is rotated by the cam groove 72B of the main cam 72 as shown in FIG. 11(C). It moves in the direction of the rotation center of the main cam 72. As a result, pinch roller arm 7
5 rotates clockwise around the shaft 75B, and the pinch roller 70 separates from the capstan 69. Incidentally, the position shown in FIG. 11(C) is the position to be evacuated when there is an input from the pause button or the like during the recording/cross-playing operation.

Next, a tape tension control mechanism using a tension regulator pin will be explained. The tension regulator pin 80 is provided at the tip of a tension arm 81 that is rotatably disposed about a fulcrum 81A, and this tension arm 81 is biased clockwise by a spring 82. The tension arm 81 also has one end 8 of a brake band 83 wound around the supply reel stand 43 in the hole 81B.
3A (Fig. 12) is locked.

Therefore, the tension arm 81 is rotated as appropriate depending on the balance between the tension applied by the tension regulator pin 80 from the tape and the biasing force of the spring 82, and thereby the brake band 83 controls the braking of the supply reel stand 43 to keep the tension of the tape constant. I try to keep it at that value.

The supply reel stand 43 and the take-up reel stand 44 are rotationally driven by a capstan motor (not shown). That is, in FIG. 12, rotational power is transmitted to the gear 84A from the capstan motor via a timing belt (not shown), and the oscillating gear 84B is supported by the lever 84C and the gear 84A. It meshes with. Therefore, the oscillating gear 84B is the gear 8
The rotational fulcrum 84D of the lever 84C depends on the direction of rotation of the lever 84A.
The supply reel stand 43 or the take-up reel stand 4
Rotational driving force is transmitted by meshing with a gear provided on the outer periphery of 4.

Next, a mechanism for retracting the tension regulator pin,
A mechanism for controlling the soft brake arm and the cassette brake arm will be explained.

As shown in FIGS. 11(Δ) to (C), the control rod 88
arrow A due to the rack 88D meshing with the small gear 73A.
In addition to being able to move directly in the B force direction, three cam grooves 88A, 8
It has 8B and 88C.

These cams a88A188B188C have cam followers 85A and 86A provided on the arm 85, soft brake arm 86, and cassette brake arm 87, respectively.
, 87A are engaged, and the arm 85, soft brake arm 86, and cassette brake arm 87 are rotated about pivot points 85B, 86B, and 87B, respectively, at appropriate times in accordance with the movement of the control rod 88 in the direction of arrow AB force. and rotate. The pivot points 85B, 86B, and 87B are fixed to the lower surface of the subshear 62 (FIG. 9).

Now, the arm 85 retracts the tension regulator pin 80 from the guide groove 54 during tape loading (
6(A) to (C)), after tape loading is completed, the tension regulator pin 80 is returned to the predetermined operating position on the guide groove 54 (FIG. 6(D)), and the arm 8
The tip end 85C of 5 is the rear end 81 of the tension arm 81.
C, the tension arm 81 is rotated counterclockwise against the urging force of the spring 82 (FIGS. 11(A) and 11(C)).

The soft brake arm 86 prevents the tape from being pulled out more than necessary due to the inertia of the supply reel stand 43 during tape loading, thereby preventing the tape from loosening. (Fig. 12) A pressing force is applied from above to the biasing force of the spring 89 to provide resistance to the supply reel stand 43 (see Fig. 1).

When the cassette brake arm 87 is installed, the release member 87C at the tip of the arm is inserted into the hole 19A of the cassette 10 shown in FIG.
direction to release the brake of the reel 11.11.

Now, when the tape has been pulled out by the tape guide block moving mechanism described above, the tension regulator pin 80 is moved to the arm 85 as shown in FIG. 11A).
At the same time, the supply reel stand 43 is soft-braked by the soft-brake arm 86.

Thereafter, the mode motor 71 is driven, and the control rod 88 moves in the direction of arrow B via the gear 7IA, the gears 72A1 and 73.73A of the main cam 72, and the rack 88D, and when it reaches the position shown in FIG. 11(B). , the arm 85 and the soft brake arm 86 each have a control rod 88
is rotated counterclockwise by cam grooves 88A and 88B. As a result, the tension regulator pin 80 is rotated to a predetermined operating position and the soft brake is released.

When the control rod 88 further moves in the direction of arrow B from the position shown in FIG. 11(B), the arm 85 and the cassette brake arm 87 are moved into the cam grooves 88A and 88C of the control rod 88, respectively, as shown in FIG. 11(C). is rotated clockwise by. As a result, the tension regulator pin 80 is rotated to the retracted position similar to that shown in FIG. 11(A), and the brake is applied to the reel 11.11 of the cassette 10.

Note that the control rod 88 is equipped with a rack 8 other than the rack 88D.
8E is formed, and this rack 88E meshes with a gear (not shown) attached to a rotary encoder that detects the absolute position of the control rod 88 in the directions of arrows A and B. The drive of the mode motor 71 is controlled based on the absolute position of the control rod 88 detected by this rotary encoder.

[Slant pin movement mechanism]

Next, a mechanism for moving the slant pin will be explained.

FIGS. 13(A) and 13(B) are perspective views showing one embodiment of the slant pin moving mechanism, respectively, and FIG. 13(A) shows the slant pins 90Δ and 90B in a fallen state; (B) shows the state in which the slant pins 90Δ and 90B are raised.

This slant pin moving mechanism collapses the slant pins 9QA and 90B to evacuate them from the tape running path when loading the tape (Fig. 6 (A) and (B)), and after the tape has been pulled out, the slant pins 90A and 90B are moved. This gives a slight twist to the tape so that it stands up and runs in close contact with a predetermined position on the rotating head drum 22 (
Figure 6 (C), (D)).

That is, this slant pin moving mechanism mainly consists of holding members 91.9 that hold the slant pins 9OA and 90B.
2, and the slant pin receiver fixed to the chassis is member 93.94.
, main arm 95, lever 96, and rod 97A.
, 97B, springs 98A, 98B, and a main cam 72.

The main arm 95 is rotatably arranged around a support shaft 95A fixed to the chassis, and a cam follower 95B is implanted therein. engaged. The cam groove is formed so that when the main cam 72 rotates counterclockwise, the cam follower 95B moves toward the center of rotation of the main cam 72, causing the main arm 95 to rotate counterclockwise.

The rods 97A, 97B connect the main arm 95, the holding member 91, and the lever 96, respectively, and are connected to the main arm 95 via pins 97C, 97D inserted into elongated holes 95C, 95D.

The lever 96 is rotatably disposed around a support shaft 96A fixed to the chassis and has a gear 96B, which meshes with a gear 92C provided on the holding member 92. Also, the springs 98A and 98B are connected to the rod 97A.
, 97B are biased in the six directions indicated by the arrows.

The slant pins 90A and 90B are loosely inserted into support shafts 91A and 92B fixed to the chassis, respectively.

Next, the operation of the slant pin moving mechanism will be explained. FIG. 13(A) shows the slant pin 9 as described above.
0A and 90B are shown in a fallen state, and in this state, the cam follower 95B of the main arm 95 is at the outermost peripheral position of the main cam 72. Also, rods 97A, 9
7B is biased in the six directions of arrows by springs 98A and 98B, respectively, but pins 97C and 97D abut on elongated holes 95C and 95D of main arm 95, respectively, and their movement is restricted.

From this state, the mode motor 71 is driven and the main cam 7
2 rotates counterclockwise, the main arm 95 rotates counterclockwise because the cam follower 95B moves toward the center of rotation of the main cam 72, as shown in FIG. 13(B).

As a result, the rod 97A is moved in the same direction by the urging force of the spring 98A in the six directions of the arrows, and the holding member 91 is moved toward the support shaft 9.
1A in the clockwise direction to press the slant pin 90A against the slant pin receiver 1 member 93. At this time, since the slant pin 90A is loosely inserted into the support shaft 91A, the slant pin receiver is inserted into the grooves 93A and 93B of the member 93.
On the other hand, the holding member 91 is supported only at two points:
Press only with the pressing piece 91B at the intermediate position between A and 93B.

Thereby, the slant pin 90A is accurately positioned with respect to the member 93. In addition, rod 97
A pin 97C is located approximately at the center of the elongated hole 95C of the main arm 95, and the rod 97A, that is, the slant pin 9
Only the urging force by the spring 98A is applied to 0A.

Similarly, the rod 97B is moved in the same direction by the urging force of the spring 98B in the six directions of the arrows, and the lever 96 is moved by the support shaft 96.
It rotates counterclockwise around A, and the gear 96B also rotates in the same direction. As a result, the gear 92C that meshes with the gear 96B rotates clockwise around the support shaft 92B, and the holding member 92 also rotates in the same direction to move the slant pin 90B to the slant pin receiver. Press 94.

The slant pin receiver of this slant pin 90B is member 9.
Positioning for the slant pin 4 is performed in the same manner as for the slant pin 90A.

Generally, high precision is required for the tape to travel between the supply reel and the capstan 69, but the device of this embodiment also has guide rollers 68A and 68B (positioned fixed to the main chassis 60) with high precision (see Fig. 8). )) and are guided by the slant pins 90A and 90B.

In this embodiment, the belt 55 is driven by the belt drive motor 57, but the present invention is not limited to this, and the driving force for the belt 55 may be extracted from the mode motor 71 using a cam or the like. . However, in this case,
It is necessary to use a timing belt as the belt 55, or to make a part of the belt toothed so as to accurately synchronize the operation with the pinch roller or the like driven by the mode motor 71.

〔Effect of the invention〕

As explained above, according to the video tape recorder according to the present invention, the tape guide member is attached to the belt, and the tape guide member is moved by the belt to wind the video tape around the rotary head drum. Since the belt is made of an elastic body, by applying a certain tension to the belt after loading the tape, the tape guide member can be elastically urged against the receiver at a predetermined position. This results in
It is not necessary to provide a spring or the like for biasing the tape guide member as in the conventional case, and the structure of the tape loading mechanism can be simplified and the number of parts can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the mechanism of a video tape recorder according to the present invention, FIG. 2 is an external view of a camera-integrated VTR to which the video tape recorder according to the present invention is applied, and FIG. FIG. 2 is an internal perspective view of the camera-integrated VTR shown in FIG. 4. FIG. 4 is a perspective view of the videotape recorder shown in FIG. C) is a diagram showing each operating state of the lock release mechanism of the cassette front cover, and FIGS. 6(A) to (
D) is a diagram showing each operating state of a member that performs tape loading, and FIGS. 7(A) and 7(B) are perspective views each showing an embodiment of a tape guide block moving mechanism.
8 and 9 are perspective views of the main chassis and subchassis, respectively, FIG. 10 is a diagram showing other embodiments such as guide grooves of the tape guide block, and FIGS. 11(A) to (
C) is a perspective view showing an example of a moving mechanism such as a pinch roller, FIG. 12 is a perspective view of a supply reel stand, a take-up reel stand, etc., and FIGS. 13(A) and (B) are respectively a perspective view of a slant pin. 14th perspective view showing an embodiment of the moving mechanism of
Figures (A) and (B) are perspective views of the 8 mm video cassette with the lid closed and the lid open, respectively, and Fig. 15 is a bottom view of the 8 mm video cassette. 10... Cassette, 10C... Cassette mouth portion, 22... Rotating head drum, 43... Supply reel stand, 44... Take-up reel stand, 50.51.
52...Tape guide block, 53.54...
・Guide groove, 55...Belt, 69...Capstan, 70...Pinch roller, 90A, 9
0B...Slant pin.

Claims (5)

[Claims] (1) A video tape recorder in which a tape guide member is attached to a belt, and the tape guide member is moved by the belt to wind the video tape around a rotating head drum, the belt being made of an elastic body, and the tape being positioned at a predetermined position after loading the tape. A video tape recorder characterized in that the tape guide member is elastically biased against the receiving portion by the tension of the belt. (2) The video tape recorder according to claim (1), wherein the belt is a rubber belt. (3) The video tape recorder according to claim (1), wherein the belt is an endless belt. (4) The video tape recorder according to claim (1), wherein the rotary head drum is disposed on the side of the video cassette mounted at the predetermined position. (5) The video tape recorder according to claim (1), wherein the main body of the video tape recorder has substantially the same width as the minimum width of the video cassette.