JPH07101531B2 - Reel drive - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel driving device used in a video tape recorder or the like.

2. Description of the Related Art Generally, in a reel driving device such as a video tape recorder, since the number of rotations of the reel in the cassette changes depending on the tape winding diameter difference during recording or reproduction, the reel driving device that connects the reel and the driving source (motor). A slip mechanism is provided in the means so that a constant driving force is transmitted to the reel. The structure of the slip mechanism is often used in which a felt friction plate is pressure-bonded and slipped between them.

In addition, a soft brake is provided in the reel driving means on the winding side for stable running of the magnetic tape, and when the tape is forward feed (recording or playback), the soft brake is released and reverse feed (reverse playback) is performed. ) Sometimes, it is often used to operate the above-mentioned soft brake to apply a constant brake torque to the take-up reel at the time of forward feeding.

Hereinafter, a conventional reel driving device will be described with reference to the drawings. 8 and 9 are plan views of a conventional reel driving device, FIG. 8 shows a normal feeding state (recording or reproducing) of the tape, and FIG. 9 shows the tape in a direction opposite to that of FIG. The moving reverse feed state (reverse playback) is shown. Also,
FIG. 10 is a sectional view of an essential part of FIG. In the figure, 1 is a motor pulley that is interlocked with a capstan motor (not shown) that sends out a tape, 2 is a belt that transmits the driving force of the motor pulley 1, and 3 is a pulley 3a and a gear 3b around which the belt 2 is wound. The main pulley 4 has a rolling contact arm which is rotatable around the rotation axis of the main pulley 3, and 5 a rolling contact gear which is disposed on the rolling contact arm 4 and meshes with a gear 3b of the main pulley 3. Since a small braking torque is applied to the rolling contact gear 5 by the spring 5a, the rolling contact arm 4 first rotates in conjunction with the rotation of the main pulley 3 to rotate the rolling contact arm 4. After stopping, the rolling gear 5 turns into the main pulley 3
It is configured to rotate in conjunction with the gear 3b. Reference numeral 6 is a winding side clutch having a slip mechanism inside.
As shown in FIG. 10, the inner structure has an input gear 6a that meshes with the rolling gear 5 and an output gear 6b that has the same rotation center as the input gear 6a.
And a felt 6c that generates a constant torque by slipping
And a pressing spring 6d for pressing the felt 6c onto the input gear 6a and the output gear 6b, and a cap 6e for preventing the pressing spring 6d from coming off. 7 is an output gear of the winding side clutch 6.
6b, a winding reel stand that fits with the reel of the cassette, 8 is a supply clutch having a slip mechanism similar to that of the winding clutch 6, 9 is an output gear 8b of the supply clutch 8, A supply-side reel stand fitted with a reel of a cassette, 10 is a soft brake that can be rotated about a rotation fulcrum 10a, and 11 is a soft brake spring that biases the soft brake 10 in one direction.

The operation of the conventional reel driving device configured as described above will be described below. In FIG. 8, the driving force of the motor pulley 1 rotating in the direction of the arrow in the figure is transmitted to the main pulley 3 by the belt 2. Main pulley 3
The rotation of the rolling contact arm 4 is rotated to the position shown in the figure, and the driving force of the main pulley 3 is transmitted to the winding side clutch 6 via the rolling contact gear 5. Take-up side clutch 6
Since the structure of (1) has a built-in slip mechanism as described above, only a predetermined driving force is transmitted to the winding side reel base 7. At that time, the soft brake 10 is separated from the take-up reel stand 7 by a kick lever (not shown) as shown in the figure.

Further, as shown in FIG. 9, when the motor pulley 1 rotates in the opposite direction to that of FIG. 8, the rolling contact arm 4 is rotated by the rotation of the main pulley 3 to the position shown in FIG. The driving force of the main pulley 3 is transmitted to the supply side clutch 8. Here, since the supply side clutch 8 has a built-in slip mechanism as described above, only a predetermined driving force is transmitted to the supply side reel base. At this time, the soft brake 10 is pressed against the take-up reel stand 7 by the force of the soft brake spring 11 as shown in the figure, so that a predetermined brake torque is generated on the take-up reel stand 7.

However, in the above-mentioned configuration, a mechanism for operating or releasing the soft brake is necessary, and the mechanism mode of the forward feed state and the mechanism mode of the reverse feed state are necessarily separated. However, there is a problem that a complicated mechanism is required.

Means for Solving the Problems The reel driving device of the present invention includes a first reel driving means having a first slip mechanism for transmitting a constant driving force to a first reel of a cassette at the time of recording or reproducing, and a reverse driving at the time of reverse reproducing. A second reel driving means having a second slip mechanism for transmitting a constant driving force to the second reel of the cassette, a pinch roller which presses the capstan and sends out the tape, and a pinch roller which holds and is rotatable. A first pinch roller arm, and the first slip mechanism includes an input gear that follows the rotation of the drive source of the first reel driving means, and an output gear that follows the rotation of the first reel of the cassette. ,
A rotation blocking member that detects the rotation direction to block the rotation of the input gear by engaging with the input gear when the second reel driving means operates. The rotation blocking member serves as the rotation blocking member. By interlocking with the pinch roller arm, the magnetic tape is wound around the cylinder to perform the reverse reproduction, the rotation preventing operation of the input gear is performed, and the rotation operation is not performed in the non-drawing position in the magnetic tape. It was done.

Effect The present invention is configured as described above, and since the soft brake during reverse regeneration uses the first slip mechanism,
The forward feed mechanism mode and the reverse feed mechanism mechanism can be performed in the same mode.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are plan views of the first embodiment of the present invention. Figure 1 shows forward feed (recording or playback)
2 shows the reverse feed state (reverse reproduction) in which the tape moves in the direction opposite to that in FIG. Further, FIG. 3 is a cross-sectional view of the main part thereof. Here, the same components as those described in the conventional example are designated by the same reference numerals, and the duplicate description thereof will be omitted.

In the figure, 12 is a brake gear that meshes with the output gear 6b of the winding-side clutch 6, and 13 is a brake lever that can rotate about the same rotation center as the brake gear 12. Since the brake lever 13 is given a small brake torque by the spring 14, it rotates in conjunction with the rotation of the brake gear 12, but after the brake lever 13 is stopped, the brake gear 12 is rotated.
Only the structure rotates. Reference numeral 15 is a stopper of the brake lever 13 provided on a chassis (not shown) or the like.

The operation of the reel drive device of this embodiment having the above-described structure will be described below. 1 is different from FIG. 8 of the conventional example in that the brake gear 12 rotates in the direction of the arrow in conjunction with the rotation of the output gear 6b of the winding side clutch 6. The brake lever 13 is rotated to the position shown in the figure with the rotation of the brake gear 12, and after the brake lever 13 is stopped, only the brake gear 12 is rotated in conjunction with the output gear 6b.

Further, as shown in FIG. 2, during reverse reproduction of the tape, the take-up reel stand 7 is rotated in the arrow direction by feeding the tape. The winding-side clutch 6 rotates in the direction of the arrow in conjunction with the rotation of the winding-side reel stand 7. Here, the brake gear 12 rotates in the direction of the arrow in conjunction with the rotation of the output gear 6b of the winding side clutch 6. Brake gear
Along with the rotation of 12, the brake lever 13 is rotated to the position shown in the figure, meshes with the input gear 6a of the winding side clutch 6, and stops the rotation of the input gear 6a. After stopping the brake lever 13, the brake gear 12 continues to rotate in conjunction with the output gear 6b. As is clear from the above description, the slip mechanism inside the winding-side clutch 6 performs the slip operation even during the reverse reproduction, and the predetermined winding torque is applied to the winding-side reel base 7. Becomes

As described above, according to the present embodiment, the winding-side slip mechanism performs the slip operation during the reverse reproduction as well, whereby the recording or reproduction and the reverse reproduction are performed in the same mechanism mode.

Next, another embodiment of the present invention will be described with reference to the drawings. FIG. 4, FIG. 5 and FIG. 6 show the second aspect of the present invention.
2 is a plan view of the embodiment of FIG. FIG. 4 shows the forward feed state (recording or reproduction), FIG. 5 shows the reverse feed state (reverse playback) in which the tape moves in the opposite direction to FIG. 4, and FIG. 6 shows the tape inside the cassette. Shows the state of the non-drawing position (fast forward or rewind) stored in. FIG. 7 is a sectional view of the main part. In the figure, 21 is a motor pulley 4, 22 is a belt, and 23
Is a main pulley, 24 is a rolling contact arm, 25 is a rolling gear, and 26 is a take-up side clutch which is a first slip mechanism for transmitting a constant driving force to a first reel (not shown). As shown in FIG. 7, the input gear 26a and the output gear 26b
And felt 26c etc. In addition, cap 2
6e is press-fitted into the output gear 26b. Reference numeral 27 is a take-up reel gear that meshes with the output gear 26b of the take-up clutch 26 and the reel of the cassette, and 28 is a supply reel stand that fits with the reel of the cassette and has a slip mechanism built therein. 29 has an elastic body portion 29a that presses the cap 26e of the winding side clutch 26, and has an input gear 26a at the tip.
A soft brake lever having a tooth portion and a claw portion that can be engaged with, 30 is a pinch roller that is pressed against a capstan (not shown) and sends out a tape, 31 is a pinch roller 30,
A pinch roller arm that is rotatable around a fulcrum 31a.

The operation of the reel drive device of the present embodiment configured as described above will be described below. In FIG. 4, the winding side clutch 26 rotates in the direction of the arrow. Here, the soft brake lever 29 is rotated to the position shown in FIG. 4 by the frictional force between the cap 26e of the winding side clutch 26 and the elastic body portion 29a of the soft brake lever 29. The rotation of the soft brake lever 29 is regulated by the cutout portion 31a of the pinch roller arm 31.

Further, as shown in FIG. 5, at the time of reverse reproduction, the take-up reel gear 27 is rotated in the arrow direction by feeding the tape. The winding-side clutch 26 rotates in the direction of the arrow in conjunction with the rotation of the winding-side reel gear 27. Here, the cap 26e interlocked with the output gear 26b of the winding side clutch 26 and the elastic body portion 29a of the soft brake lever 29.
Friction force causes the soft brake lever 29 to rotate from the position shown in FIG. 4 to the position shown in FIG. 5, and the soft brake lever 29 is attached to the tooth portion of the input gear 26a of the winding side clutch 26.
The claws of the two engage with each other to stop the rotation of the input gear 26a.
Therefore, the claw portion of the soft brake lever 29 has the input gear 26a.
It becomes a rotation blocking member that blocks the rotation of the. From the above, the slip mechanism inside the winding-side clutch 26 performs the slip operation even during the reverse reproduction, and the predetermined braking torque is applied to the winding-side reel gear 27.

Further, as shown in FIG. 6, when the tape is in the non-pulled-out position (fast forward or rewind), the pinch arm 31 is rotated to the position shown in the figure by the rotation lever (not shown), and the pinch arm 31 is moved accordingly. The soft brake lever 29 is also rotated to the position shown in the figure by the notch 31a. As a result, during the fast forward or rewind operation performed at the tape non-drawing position, the soft brake lever 29
Will not work.

As described above, according to the present invention, since the slip mechanism for transmitting the constant driving force to the reel of the cassette at the time of recording or reproducing is used as the soft brake at the time of reverse reproducing, the mechanism mode in the forward supplying state and the reverse supplying state can be used. The mechanism mode of the state can be the same mode. Further, in the non-pulling-out position of the magnetic tape, the soft brake lever, which is the rotation preventing member, is not interlocked with the pinch roller arm to perform the interfering operation, so that the normal fast forward or rewind operation is performed. By the above, the excellent effect that the mechanism is greatly simplified can be obtained.

[Brief description of drawings]

1 and 2 are plan views showing a first embodiment of a reel driving device of the present invention, FIG. 3 is a cross-sectional view of the essential parts thereof, and FIG.
FIG. 5, FIG. 5 and FIG. 6 are plan views showing a second embodiment of the reel driving device of the present invention, FIG. 7 is a sectional view of the essential parts thereof, and FIGS. 8 and 9 are conventional reel driving devices. Top view of the
FIG. 10 is a sectional view of the main part. 6,26 ...... Winding side clutch, 7 …… Winding side reel stand, 10 …… Soft brake, 13,29 …… Soft brake lever, 27 …… Winding side reel gear.

Claims (1)

[Claims] 1. A first reel driving means having a first slip mechanism for transmitting a constant driving force to a first reel of a cassette during recording or reproducing, and a second reel driving means of the cassette during reverse reproducing.
Second reel driving means having a second slip mechanism for transmitting a constant driving force to the reel, a pinch roller that presses the capstan and feeds the tape, and a pinch roller arm that holds the pinch roller and is rotatable. The first slip mechanism includes an input gear that follows the rotation of the drive source of the first reel drive means, and the first slip mechanism of the cassette.
An output gear that follows the rotation of the reel, and a rotation blocking member that blocks the rotation of the input gear by engaging the input gear when the second reel drive means operates by detecting the rotation direction. When the rotation preventing member is interlocked with the pinch roller arm, the input gear is prevented from rotating at the tape pull-out position where the magnetic tape is wound around the cylinder to perform reverse reproduction, and the magnetic tape is not pulled out from the cassette. The reel drive device is characterized in that the rotation preventing operation is not performed in the position.