JPS5911558A - magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device capable of reciprocating recording and reproducing.
This device uses the force of the motor that drives the reel stand to release the lock during operation, and is particularly intended to enable unlocking even when the reel stand is stopped.

The present invention provides two flywheels for normal rotation and reverse rotation, one flywheel transmits the power to rotate the reel stand, and this flywheel is provided with a friction mechanism, and the other It is characterized by a structure in which the rotational force that unlocks the running state is obtained from the flywheel, and when the reel stand is stopped, one flywheel slips due to the friction mechanism and is unlocked by the rotational force of the other flywheel. Accordingly, it is possible to provide a magnetic recording/reproducing device having a very simple configuration that can perform the following operations.

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

FIG. 1 is a plan view of the mechanical parts of the magnetic recording and reproducing apparatus of this embodiment, especially the rotating system, FIG. 2 is a side view, and FIGS.
The figure is a sectional view for explaining the operation of the take-up reel stand.

Figure 1 shows the normal rotation playback state, with cassette 1,
In the rotation system at the bottom of the recording/reproducing head 2, a forward flywheel 3 and a reverse flywheel 4 are driven by a motor 6 through a single belt 5, and rotate in opposite directions to provide an anti-rolling effect. This belt 6 is
As shown in the side view of Figure 2, in order to store it compactly, the Mokuro Guri is placed between two flywheels 3 and 4.
It is stretched dimensionally.

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

As shown in FIG. 3, a flywheel gear 9, which is formed coaxially with the normal rotation capstan 7 and rotates together with it, is always engaged with the first reduction gear 1o. The shaft 13 of this reduction gear 1o is mounted on the idler plate 12, and this idler plate 12 is further mounted on the mechanical chassis! 1I11
It is rotatably pivoted by 1. This axis 11 and 13
As is clear from Fig. 1, the relationship between the forward rotation capstan 7 and the normal rotation capstan 7 is approximately on the same line, and even if the idler plate 12 slightly rotates around the shaft 13, the flywheel gear 9 and the first reduction gear 1o is designed not to leave.

A winding gear 14 for forward rotation is coaxially formed on the first reduction gear 1o so as to slip with a constant torque as described later, 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 the tape, the flywheel gear 9. 1st reduction gear.

Forward rotation winding gear 14. The information is sequentially transmitted to the reel stand gear 15a, the reel stand gear 15a rotates counterclockwise, and the reel stand 15c, which rotates together with the reel stand gear 15a, takes up the entire tape.

Here, as shown in FIG. 3, the slip mechanism of the first reduction gear 10 and the forward rotation take-up gear 14 is achieved 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 to apply friction force. It is designed to obtain a constant torque. The reduction ratio in the rotation system of the octopus is 1, which is the rotation speed of the reel stand 15C of 0.3 to 0.7/sec in order to wind the tape at a constant speed.
．． The rotation is about 1 to 2 times faster.

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

In the fast forward state, the pressure force of the pinch row 28 on the tape against the TfE diversion capstan 7 is released (the tape and the head 2
The reel stand 15Ci must be driven at high speed with strong torque (either in contact or non-contact). 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 vertically separated, but when viewed from the top, they are in a position where they can be engaged, and the forward rotation winding gear 14 and It is engaged with the reel stand gear 15a.

When the reel stand 15ci is moved downward by manual operation, the first reduction gear 1o and the reel stand gear 1 are moved downward as shown in FIG.
5b, while the take-up gear 14 and the reel stand gear 15
a leaves. Thereby, the flywheel gear d is directly connected to the reel stand 15c via the first reduction gear 1o, and the reel stand 15c can be rotated with strong torque and at high speed.

As for the movement mechanism of the reel stand 15c, the shaft 19 mounted on the reel stand board 18 is used as a guide and the shaft 1 is moved inside the reel stand 15c as a guide.
5d can slide up and down, and this shaft 1sd, which is always biased upward by a spring 2o, has the above-mentioned reel stand 15c, IJ-le gear 15b% J-le gear. 15a is press-fitted and rotates together. When the reel stand 15c is pushed downward by manual operation, the locking member 21 enters the recess at the lower end of the shaft 15d, and the reel stand 15c is locked in the middle position. Gear 15b is engaged and enters the fast forwarding state.

Next, play in reverse and fast forward in reverse (rewinding in forward play)
We will explain the state of .

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 the idler moving mechanism described later, and the first reduction gear 10 rotating around the shaft 13 is moved. As mentioned above, even a small amount of movement will not separate the gear 1o from the flywheel gear a, but it will separate from the straight 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, this engagement is strong during normal rotation as described above.

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 22, the reversal take-up gear 23. Reel stand gear 25a
The rotational force is sequentially transmitted to the reel stand gear 25a, which rotates clockwise, and the tape can be wound up by the reel stand gear 25c, which rotates together with the reel stand gear 25a. Of course, at this time, the forward rotation pinch row 28 separates from the forward rotation capstan 7,
The reversing pinch roller 26 presses against the reversing capstan 27, and the tape runs in the reversing 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 achieved by sandwiching a felt 28 between them and pressing them together from the reversing take-up gear 23 side with a spring 29, so that the slipping mechanism is constant due to frictional force. transmitting torque. This allows the winding torque to be set independently for normal rotation and reverse rotation independently of the slip mechanism for forward rotation described above.

Next, the fast rewind (fast forward) mode in the reverse direction will be explained. In fast rewinding, in order to rotate the reel stand 26cf with a strong torque and high speed similar to fast forwarding, the reel stand 15
Similar to C, the reel stand 25c has a unique rotation system that moves up and down.

In the reversal playback mode shown in FIGS. 5 and 6, the second reduction gear 22 and the reel stand gear 25b are separated in the vertical direction, but when seen in a plan view, they are in a position where they can be engaged, and the reel take-up for reversal The gear 23 and the reel stand gear 25a are engaged. When the reel stand 25c is moved downward by manual operation, the idler plate 12 is rotated clockwise by the idler movement mechanism in the same way as during reverse playback, and the forward rotation reel stand gears 15a, 15b and the first reduction gear 10 are rotated. When the engagement is disengaged, 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 the reel stand gear 25b engage with each other. 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 26b is engaged, resulting in a fast rewinding state. Retained. As described above, by locking the vertical movement of each axis during fast forwarding and fast forwarding back, the mode can be maintained.

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

Idler m12 that rotates around the shaft 11 of the mechanical chassis
A shaft 32 is installed in the shaft 32, and this shaft 32 is guided by the cam surface of the drive cam 31 and rotates between a normal rotation state 32 and a reverse rotation state 32.
’ position. The relay gear 30, which is always engaged with the first reduction gear 1o, is a shaft 33 mounted on the mechanical chassis.
A gear 30a, which rotates around the relay gear 30 and is integrally provided coaxially with the relay gear 30, is in a state where it can be engaged with the drive cam 31.

The relationship between the relay gear 30 and the drive cam 31 is shown in FIGS. 9(b) and 9(c) as seen from above and as shown in FIG. 10 as seen from the back.

←) and will be explained below.

FIG. 9(-) 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 drive cam 31 is locked by the locking member 35 controlled by the solenoid 34, as shown in Figure 10 when viewed from the back. (Fast forward in reverse direction)
By pushing the reel stand 25c to set the mode,
When the solenoid 34 is attracted as shown in FIG. 10(b), the locking member 35 gives initial rotation to the drive cam, so that the relay gear 30a and the drive cam 31 are engaged.

Therefore, as shown in Fig. 9 0)), the forward rotation flywheel 3° and the first reduction gear 10. A rotational force is applied to the drive cam 31 from the relay gears 30, 30a, and the shaft 32 moves along the cam surface. That is, the idler plate 12 rotates around the shaft 11 to a position 12' shown in dashed lines in FIG. Then, the state shifts to the inverted state shown in FIG. 9(C). In the reversed state, the other toothless part 31b of the drive cam 31 (located in a symmetrical position with the toothless part 31a) faces the relay gear 30a, and the rotation of the drive cam 31 is stopped, and on the back side, as shown in FIG. They are locked by the locking member 35 in the same positional relationship.

Next, according to the present embodiment, rotation of the idler plate 12 switches between normal rotation playback and reverse playback, and in each state, the drive By moving the reel stand downward, rapid forwarding in the rotational direction is possible.

That is, during normal rotation regeneration, the solenoid 34 is controlled so as to advance the head of the pinch roller 8 for normal rotation and move the idler plate 12 to the normal rotation side. At the time of reversal reproduction, the solenoid 34 is controlled to move the reversal pinch roller 26 and the head forward at the same time, and move the idler plate 12 to the reversal side (12'). During fast forward rotation, IJ/
By pushing the table 15c downward, the object that is in contact with it at that time is removed.

/Tyrola Controls the solenoid 34 to move the fully released heel idler plate 12 to the forward rotation side. Similarly, for the early spring of normal rotation and the rapid forwarding of reverse direction, the solenoid is activated so that by pushing the reel stand 25C downward, the pinch roller that is in contact at that time is released and the idler plate 12 is moved to the reverse side (12'). 34, it became possible to construct a mechanism capable of reciprocating movement in a very simple manner, and this greatly contributed to the weight reduction of the 11-type model.

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, It may be provided between the stand gears 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.

Next, the winding torque of fast forwarding and early spring return will be explained. Returning to FIG. 3, a felt 44 is sandwiched between the forward rotation flywheel 3 and the flywheel gear 9, and is pressed by a spring 45 to obtain a constant frictional torque. 7 of this configuration
Due to the retraction mechanism, the reel stand 15.2 at the end of fast feed.
Even if the flywheel gear 9 is stopped and the flywheel gear 9 is stopped, it will slip between it and the forward rotation flywheel.

Furthermore, the movement of the head 2 will be explained. Figure 11 shows
FIG. 3 is a plan view of the area around the head board 39 and the reel stand board 18 at the bottom of the mechanical chassis. The head 2 is fixed to the head substrate 39, and the head 2 is provided with long holes s9a and 39b.
is provided, which is movable in parallel along the guide pins 40, 41 of the adult mechanical chassis, and is biased in the return direction by a return spring 38. By the way, the fly I rotates together with the reverse flywheel 4.
A regeneration cam 37 is provided at a position where it can be engaged with the E oil gear 36, and when the regeneration cam 37 is in a stopped state, the toothless portion 3 of the regeneration cam 37 is engaged.
7a and the 7 life wheel gears 36 and 75 are opposed to each other, and the regeneration cam 3 is stopped. This regeneration cam 37 is controlled manually or by a solenoid or the like, and is locked at the regeneration position and the stop position. When the playback operation is performed, it engages with the flywheel gear 37, and due to its rotational force, the cam surface 37b moves the head base plate 39G upward in the figure.
That is, the head 2 advances to the reproduction position.

At this time, the other end 39d of the head board releases the lock of one end 21a of the lock plate 21 (i7) that locks the lower end of the shaft of the reel stand (i7 kick-up, fast forward, or early spring return. To explain, the spring 4 is rotatably supported by a shaft 43 mounted on the reel board 18 at a position between two reel stands, and is attached near one end 21a.
It is energized by 2. When the shaft of the reel stand mentioned above is pressed, the lock plate 21 has a conical lower end 15d, 26d.
It is pushed sideways with the diagonal rotation of and rotates a little against the spring 42,
When the shaft is further lowered, the force of the spring 42 enters into the four parts and prevents the shaft from moving upward.

Therefore, when a regeneration operation is performed during fast forwarding or early spring return, the head board 39 moves forward and the lock plate 21 moves forward.
You can unlock fast forward and early spring return by moving.

In addition, as mentioned above, the torque for fast traverse and early spring return is extracted from the forward rotation side flywheel 3, and since the normal rotation side flywheel 3 is provided with friction, the reel stand Even when the regenerating cam 37. is locked, the regeneration cam 37. Rapid forwarding and early spring return can be canceled (release of the lock plate 21) via the head board 39.

In the above configuration, the head board 39 is movable back and forth, and when the head moves forward, the head contacts the tape for playback (or recording), and when it moves backward, it performs fast forwarding or rewinding. Although the lock plate 21 is moved at the end when moving forward, the present invention is applicable to the reversing flywheel 4 regardless of whether the head substrate 39 is movable or not.
Any configuration may be used as long as the zero rotational force is transmitted to the lock plate 21 by the regeneration cam 37 or the like. For example, the head 2 is always fixed, and has a pad that presses the tape inside the cassette tape, fast forwards nine times backward, and has a member that is pushed in when stopped to make the tape and head non-contact. Even if the tape is brought into contact with the head by moving the member backward, the present invention can be realized by interlocking the reproducing cam 37 with the member and interlocking with the lock plate 21.

As described above, according to the present invention, two flywheels are provided for normal rotation and nine reverse rotation, one of the flywheels is used to rotate the reel stand, and this flywheel (
The C-flick mechanism is designed so that the locking member for locking the running state is released by the rotational force of the other flyboiler, so even when the reel stand stops at the end of the tape during fast forwarding, etc. The friction mechanism allows the former flywheel to slip and the locking member to be released by the rotational force of the other flywheel, making it possible to achieve a simple operation and configuration, which can greatly contribute to reduction in size and weight.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention during normal rotation, FIG. 2 is a side view thereof, and FIG. 3 is a sectional view illustrating the operation of the take-up reel stand during normal rotation. The figure is a cross-sectional view to explain the operation of the take-up reel stand during rapid forwarding, and Figure 5 is a plan view showing the reverse operation. Figure 7 is a cross-sectional view to explain the operation of the supply reel stand. 8 is a plan view of the idler moving mechanism, FIG. 9 (→, (b), (C) is a plan view showing the cam mechanism, and FIG. 10 (m , (b) is a back view of the cam mechanism, and FIG. 11 is a plan view showing the head drive mechanism. 1...Cassette, 3...Flywheel for normal rotation, 4... ...1 Flywheel for reversal, 5...
・ Belt, 6...Motor, 7...
Cab stun for forward rotation, 9...Flywheel gear, 1o...1st reduction gear, 12...Idler plate, 14...Take-up gear for self-pressure diversion, 1sa , 1s
b...Forward rotation reel stand gear, 15C...
・Forward rotation reel stand, 21..., ・Lock plate, 22.
...Second reduction gear, 23...Reverse take-up gear, 26a, 2sb...Reverse reel stand gear, 25c...Reverse reel stand, 3o, 30a
-... Relay gear S31... Drive cam, 3
1a. 31b... Missing tooth part-34... Solenoid, 36...41. Flywheel gear, 37. ,
,,, Regeneration cam, 37a... Missing tooth part, 39
...Head board, 44...Felt, 4
5... Spring. Name of agent: Patent attorney Toshio Nakao and one other person No. 9
Figure, q1 Figure 10

Claims (1)

[Claims] A reel stand for winding the tape, and a first reel stand with different rotational directions provided to run the tape in both directions. The second capstan and this first capstan. The first capstan is coaxial with the second capstan. A second flywheel, a first flywheel gear that is coaxial with the first flywheel and rotates via a friction mechanism that obtains a constant torque, and the flywheel gear decelerates and transmits rotational force to rotate to the reel stand. a rotation transmission mechanism that transmits the rotation, a lock member that completely fixes the running state, a second flywheel gear that rotates coaxially and integrally with the second flywheel, and the lock member that uses the rotational force of the second flywheel gear. When the reel stand stops and the rotational force of the first flywheel gear is stopped, the rotational force of the second flywheel causes the lock to be released via the second flywheel gear. A magnetic recording/reproducing device characterized in that it is configured to unlock by moving a member.