JPS6412022B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device capable of reciprocating recording and reproducing, and particularly aims to simplify the mechanical section, reduce the number of parts, and realize a reduction in size and weight.

The present invention focuses on the fact that low torque transmission requires a small belt winding angle, and the present invention concentrates torque on one of the two flywheels driven by a single belt and transfers it to the reel stand. It is characterized in that it is used for driving a capstan, etc. by reducing the winding angle of the other flywheel.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing the rotating system of the mechanical parts of the magnetic recording/reproducing apparatus of this embodiment, FIG. 2 is a side view, and FIGS. 3 and 4 are diagrams for explaining the operation of the take-up reel stand. FIG.

FIG. 1 shows the normal rotation playback state. In the rotating system below the cassette 1 and the recording/playback head 2, the normal rotation flywheel 3 and the reversal flywheel 4 are connected to a motor by a single belt 5. 6 and rotate in opposite directions to provide an anti-rolling effect. As shown in the side view of FIG. 2, this belt 5 is attached to the pulley of the motor 6, the two flywheels 3,
4 is extended three-dimensionally.

The axis of the forward rotation flywheel 3 is a forward rotation capstan 7, and a forward rotation pinch roller 8 is selectively pressed against the forward rotation capstan to cause the tape to travel in the forward rotation side.

As shown in Fig. 3, this forward rotation capstan 7
The flywheel gear 9, which is formed coaxially with and constantly rotates, is always engaged with the first reduction gear 10. The shaft 13 of this reduction gear 10 is connected to the idler plate 12.
Further, this idler plate 12 is rotatably supported by a shaft 11 that is mounted on a mechanical chassis. As is clear from FIG. 1, the relationship between the shafts 11 and 13 is that they are approximately on the same line as the forward rotation capstan 7, and the idler plate 12
The flywheel gear 9 and the first reduction gear 10 are designed not to separate even if the flywheel gear 9 and the first reduction gear 10 rotate slightly.
This first reduction gear 10 includes a winding gear 14 for forward rotation so as to slip at a constant torque as described later.
are coaxial, and this gear 14 is engaged with a reel stand gear 15a. This engagement occurs when the idler plate 12 is in the position shown in FIGS. 1 and 3 during normal rotation. At this time, as shown in the figure, when the forward rotation flywheel 3 rotates counterclockwise to feed out the tape, the flywheel gear 9, the first reduction gear,
The signal is sequentially transmitted to the forward rotation winding gear 14 and the reel stand gear 15a, the reel stand gear 15a rotates counterclockwise, and the tape is wound up by the reel stand 15c, which rotates together with the reel stand gear 15a.

Here, as shown in FIG. 3, the slip mechanism of the first reduction gear 10 and the forward rotation take-up gear 14 is constructed by sandwiching a felt 16 between them and pressing them together from the forward rotation take-up gear 14 side with a leaf spring 17, thereby applying frictional force. It is designed to obtain constant torque. Further, the reduction ratio in this rotation system is set to be approximately 1.1 to 2 times the rotation speed of the reel stand 15c, which is 0.3 to 0.7 revolutions/second, in order to wind the tape at a constant speed.

Next, the mode of fast forwarding (fast forwarding in the forward rotation direction) will be explained.

In the fast-forward state, the tape must be released from the pressure applied by the pinch roller 8 to the forward rotation capstan 7 (the tape and the head 2 may be in contact or non-contact), and the reel stand 15c must be driven at high speed with strong torque. No. The present invention has a unique rotation system in which the reel stand 15c is moved up and down. In the regeneration mode shown in FIGS. 1 and 3, the first reduction gear 10 and the reel stand gear 15b are separated in the vertical direction, but in a plan view they are in an engaging position, and the take-up gear 14 for forward rotation and the reel stand gear 15a are engaged.

When the reel stand 15c is moved downward by manual operation, the first reduction gear 10 and the reel stand gear 15b engage with each other, as shown in FIG.
4 and the reel stand gear 15a are separated. As a result, the flywheel gear 9 is directly connected to the reel stand 15c via the first reduction gear 10, and the reel stand 15c is directly connected to the reel stand 15c.
can be rotated with strong torque and at high speed.

The mechanism for moving the reel stand 15c is such that a shaft 15d can slide up and down using a shaft 19 mounted on the reel stand board 18 as a guide, and is always urged upward by a spring 20. has been done.
The reel stand 15c, reel stand gear 15b, and reel stand gear 15a are press-fitted into this shaft 15d and rotate together. When the reel stand 15c is pushed downward by manual operation, the locking member 21 is inserted into the recess at the lower end of the shaft 15d.
c is locked in the lowered position, and the reel base gear 15b is engaged as described above to enter the fast-forwarding state.

Next, the states of reverse playback and reverse fast forward (rewind in normal play) will be explained.

FIG. 5 is a plan view similar to FIG. 1, showing an inverted reproduction state. Here, the idler plate 12 is rotated clockwise around the shaft 11 of the mechanical chassis by an idler moving mechanism to be described later, and the first reduction gear 10 rotating around the shaft 13 is moved. As described above, a small amount of movement will not separate the gear 10 from the flywheel gear 9, but it will separate from the normal rotation reel stand gears 15a and 15b. Then, it comes to engage with the second reduction gear 22 on the opposite side from the normal rotation reel stand. Of course, during the forward rotation mentioned above,
This engagement is absent.

This second reduction gear 22 rotates around a shaft 24 mounted on the mechanical chassis. Further, the reversing take-up gear 23 is coaxial with the second reduction gear 22, is configured to slip with a constant torque, and is engaged with the reel stand gear 25a. At this time, as in the case of forward rotation, if the forward rotation flywheel 3 is rotating counterclockwise, the flywheel gear 9, the first reduction gear 10, the second reduction gear 22, and the reversal take-up gear 2
3. The rotational force is sequentially transmitted to the reel stand gear 25a, the reel stand gear 25a rotates clockwise, and the tape can be wound up by the reel stand 25c that rotates together with the reel stand gear 25a. Of course, at this time, the forward rotation pinch roller 8 is separated from the forward rotation capstan 7, the reversal pinch roller 26 is pressed against the reversal capstan 27, and the tape runs in the reverse direction.
Therefore, playback (or recording) in the reverse direction is possible.

Here, as shown in FIG. 6, the slip mechanism of the second reduction gear 22 and the reversing take-up gear 23 is configured such that a felt 28 is sandwiched between them and a spring 29 is applied to the reversing take-up gear 23.
It is crimped from the side and transmits constant torque due to frictional force. This is independent from the slip mechanism for forward rotation described above, and the winding torque can be independently set for forward rotation and reverse rotation.

Next, the fast rewind (fast forward in the reverse direction) mode will be explained. In fast winding and unwinding, in order to rotate the reel stand 25c with strong torque and high speed as in fast forwarding, the reel stand 25c is rotated in the same way as the reel stand 15c.
It constitutes a unique rotation system that moves up and down.

In the reverse playback mode shown in FIGS. 5 and 6, the second
Although the reduction gear 22 and the reel stand gear 25b are separated in the vertical direction, they are in a position where they can be engaged when seen in a plan view, and the reversing take-up gear 23 and the reel stand gear 25a are in a position where they can be engaged.
are engaged. Reel stand 25c by manual operation
When the idler 12 is moved downward, the idler 12 is rotated clockwise by the idler movement mechanism in the same way as during reverse playback, and the normal rotation reel stand gears 15a, 15b and the first
The engagement with the reduction gear 10 is disengaged, and the reversing take-up gear 23 and the reel stand gear 25a are separated from each other as shown in FIG. 7 from the planar positional relationship shown in FIG. 5, and the second reduction gear 22 and It engages with the reel stand gear 25b. Therefore, the force from the flywheel gear 9 is transmitted to the reel stand 25c, causing it to rotate at high speed with strong torque.

The structure of the reel stand is the same as that for forward rotation, and the locking member 21 enters the recess at the lower end of the reel shaft, so that the reel stand is locked in the lowered position, and the reel stand gear 25b is engaged and quickly reeled. The rewind state is maintained. As described above, by locking the vertical movement of the shaft in both fast forwarding and fast rewinding, the mode can be maintained.

Next, the idler moving mechanism will be explained. 8th
The figure shows a plan view of this part.

A shaft 32 is mounted on the idler plate 12 that rotates around the shaft 11 of the mechanical chassis, and this shaft 32 is guided by the cam surface of the drive cam 31 to be in the normal rotation state.
2 and an inverted state 32'.
Relay gear 30 always engaged with first reduction gear 10
rotates around a shaft 33 mounted on a mechanical chassis, and a gear 30a coaxially provided integrally with this relay gear 30 is in a state capable of engaging with a drive cam 31. The relationship between the relay gear 30 and the drive cam 31 is shown in FIGS.
It is shown in FIGS. 0a and 0b and will be explained below.

FIG. 9a shows a normal rotation state, in which the toothless portion 31a of the drive cam 31 faces the relay gear 30a, and the drive cam 31 does not move. At this time, the first view from the back
As shown in FIG. 0a, the drive cam 31 is locked by a locking member 35 controlled by a solenoid 34. Here, when the solenoid 34 is sucked as shown in FIG. 10b by operating the reversing playback mode or by pushing the reel stand 25c to enter the fast rewind (fast forward in the reverse direction) mode, the locking member 35 is engaged with the drive cam. An initial rotation is applied, and the relay gear 30a and the drive cam 31 are then engaged with each other. Therefore, as shown in FIG. 9b, the normal rotating flywheel 3, the first reduction gear 10, and the relay gears 30, 30a
A rotational force is applied to the drive cam 31 from 1 to 3, and the shaft 32 moves along the cam surface. That is, the idler plate 12 rotates around the shaft 11 to the position 12' shown in dashed lines in FIG. moves to the inverted state. In the reversed state, the other toothless portion 31b of the drive cam 32
(located in a symmetrical position with the missing tooth portion 31a) is the relay gear 3
The rotation of the drive cam 31 is stopped when facing the drive cam 31, and the drive cam 31 is locked by the locking member 35 on the back side in the same positional relationship as shown in FIG. 10a.

Next, if the mode is operated to enter normal rotation regeneration or forward rotation mode, the solenoid 34 is attracted, the drive cam 31 rotates half a turn in the same manner as described above, and the idler plate 12 returns to the position shown by the solid line in FIG. .

As described above, according to this embodiment, the idler plate 12
By rotating the reel, normal rotation playback and reverse playback are switched, and in each state, fast forwarding in the rotational direction is possible by moving the driven reel stand downward.

In other words, during normal rotation regeneration, the normal rotation pinch roller 8 advances the head, and the idler plate 1
2 to the forward rotation side. During reversal playback, the reversal pinch roller 26 and the head are similarly advanced, and the idler plate 12
solenoid 3 to move it to the reverse side 12'.
Control 4. During fast forward rotation, reel stand 1
By pushing 5c downward, the solenoid 34 is controlled to release the pinch roller that is in contact with it at that time and move the idler plate 12 toward the normal rotation side.
Similarly, for fast rewinding (fast forwarding in the reverse direction), by pushing the reel stand 25c downward, the solenoid 34 is controlled so as to release the pinch roller that is in contact with it at that time and move the idler plate 12 to the reverse side 12'. This made it possible to construct a reciprocating mechanism in a very simple manner, which greatly contributed to the reduction in size and weight.

Note that the above-mentioned slip mechanism is not limited to between the first reduction gear 10 and the normal rotation take-up gear 14, and between the second reduction gear 22 and the reverse rotation take-up gear 23, for example, Platform gear 15a
and 15b, or between the reel stand gears 25a and 25b. Furthermore, it goes without saying that the "playback" state mentioned above is the same as the "recording" mode when the recording operation is performed at the same time.

Furthermore, in this embodiment, the reel stand drive in all cases of forward rotation, reverse rotation, fast forwarding, and fast rewinding is extracted from the rotation of the forward rotation flywheel 3, thereby reducing the load on the reversal flywheel 4. be able to. In other words, the reversing flywheel only needs to transmit enough torque to drive the tape to the capstan 27 by pressing the pinch roller, and as shown in FIG. It can be driven sufficiently at the mounting angle. Therefore, there is no need to use separate members such as intermediate pulleys that cause wow and flutter in order to apply appropriate torque to each of the two flywheels, or to design a design that takes up a lot of space for arrangement. The structure is greatly simplified and it can greatly contribute to miniaturization.

On the other hand, the slip mechanism that sets the winding torque for fast forwarding and fast rewinding is connected to the reel stand gear 15b and 1.
5c and between the reel stand gears 25b and 25c, but the space between the flywheel 3 and the flywheel gear 9 can be used to drive either reel stand, and the number of parts is reduced. This slip mechanism is constructed by sandwiching felt between the forward rotation flywheel 3 and the flywheel gear 9 as shown in FIG.
This is a configuration in which a constant friction torque is obtained by pressing.

As described above, according to the present invention, power is selectively transmitted from the first flywheel of the two flywheels stretched on one belt to one of the reel stands via the speed reduction mechanism. Do as you like,
Since the other second flywheel is configured to apply rotational force only to one of the capstans and other lightly loaded objects, the belt can be wound around the first flywheel depending on the required torque. The angle of the belt can be made large and the wrapping angle of the belt around the second flywheel can be made small, so that it can be accommodated in a particularly small space when driven by a single belt, and there are fewer parts. Furthermore, it is possible to provide an excellent magnetic recording and reproducing device that can realize a compact and lightweight structure with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention during forward rotation, FIG. 2 is a side view thereof, FIG. 3 is a sectional view for explaining the operation of the take-up reel stand during forward rotation, and FIG. FIG. 4 is a sectional view for explaining the operation of the take-up reel stand during fast forwarding, FIG. 5 is a plan view for explaining the operation of the reel stand during reversal, FIG. 6 is a sectional view for explaining the operation of the supply reel stand, and FIG. 7 8 is a plan view of the idler moving mechanism; FIGS. 9 a, b, and c are plan views of the cam mechanism; FIGS. 10 a, b is a back view of the cam mechanism. 1...Cassette, 3...Flywheel for forward rotation,
4...Reversing flywheel, 5...Belt, 6...
... Motor, 7 ... Capstan for normal rotation, 9 ... Flywheel gear, 10 ... First reduction gear, 12
... Idler plate, 14 ... Forward rotation winding gear, 15
a, 15b...Forward rotation reel stand gear, 15c...
Forward rotation reel stand, 22...Second reduction gear, 23...
... Reversing winding gear, 25a, 25b... Reversing reel stand gear, 25c... Reversing reel stand, 30, 3
0a... Relay gear, 31... Drive cam, 31a,
31b... Missing tooth portion, 34... Solenoid, 36...
...Felt, 37...Spring.

Claims (1)

[Scope of Claims] 1. Two reel stands for winding tape, first and second capstans with different rotational directions provided for running the tape in both reciprocating directions, and the first and second capstans that rotate in different directions.
first and second flywheels coaxial with the second capstan, a flywheel gear that rotates integrally with the first capstan, and a rotation transmission mechanism that reduces and transmits the rotational force from the flywheel gear; By changing the rotation system of this rotation transmission mechanism, the rotational force can be transmitted to either reel stand, allowing forward rotation, reverse rotation, fast forwarding,
a switching mechanism for creating a fast rewinding state; a winding angle around the first flywheel is larger than a winding angle around the second flywheel; and the first and second flywheels are interchangeable. A belt is provided between the first and second flywheels and the motor so as to rotate in opposite directions, and the rotational force of the reel stand is obtained only from the first flywheel. A magnetic recording/reproducing device characterized by comprising: 2. The magnetic recording and reproducing apparatus according to claim 1, further comprising a slip mechanism for setting fast-forward and fast-rewind torques between the first flywheel and the flywheel gear.