JPS5911568A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain ease of handling with a simple construction and to attain small in size and light in weight with less number of components, by shifting a reduction gear with the changeover of idler for forwarding/reversing a reel stand and moving up and down the stand for attaining reproduction and rapid traverse. CONSTITUTION:A forward pinch roll 8 and a head are forwarded at the forward reproduction, a solenoid 34 is controlled to forward an idler plate 12, and a reverse pinch roll 26 and the head are forwarded similarly at the reverse reproduction to shift reverse the idler plate 12. Further, the pinch roll is detached by pressing downward a reel stand 15c at the rapid traverse feed, and the solenoid 34 is controlled to forward the idler plate 12, and the pinch roll is detached by pressing downward a reel stand 25c similarly at the forward fast rewinding and the solenoid 34 is controlled so as to shift the idler plate 12 in the reversing side 12'. Thus, the simple mechanism possible for reciprocating running and attainable small in size and light in weight is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device capable of reciprocating recording and reproducing.
This realizes a reel stand drive mechanism with a very simple configuration.

Conventionally, in the winding mechanism of a reel stand, in order to create four operation modes (forward rotation, nine reverse rotation, fast forward, early winding and fast forward in the reverse direction) according to a predetermined operation, many deceleration mechanisms and This required a direction switching mechanism, which increased the space and number of parts, creating a major obstacle to miniaturization and weight reduction.

The present invention solves the above-mentioned drawbacks of the conventional technology.It has a simple structure, is operable, and is easy to handle.The present invention reduces the number of parts and achieves the above-mentioned four operations while reducing the size and weight.
An object of the present invention is to provide a magnetic recording and reproducing device capable of reciprocating recording and reproducing modes.

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

FIG. 1 is a plan view showing in particular the rotating system of the mechanical parts of the magnetic recording/reproducing apparatus of this embodiment, FIG. 2 is a side view, FIG. 3 is a side view, and FIG. 4 is a cross section for explaining the operation of the take-up reel table It is a diagram.

Figure 1 shows the normal rotation playback state, with cassette 1,
In the rotation system at the lower part of the recording/reproducing throat 2, a forward rotation flywheel 3 and a reverse rotation flywheel 4 are driven by a motor 6 through a single belt 5, and rotate in opposite directions to produce an anti-rolling effect. This belt 5 is
As shown in the side view of FIG. 2, in order to store it compactly, it is three-dimensionally suspended between the pulley of the motor 6 and the two flywheels 3 and 4.

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 this normal rotation capstan to cause the tape to travel 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. A shaft 13 of the reduction gear 10 is mounted on an idler plate 12, and the idler plate 12 is rotatably supported on a shaft 11 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 prevented from separating by slightly rotating around the . This first reduction gear 1o is coaxially configured with a forward rotation take-up gear 14 so as to slip with a constant torque as described later.
4 is engaged with the 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 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 1o 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 create a frictional force. It is designed to obtain a 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 115c, 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 forwarding state, the pressure applied by the pinch roller 8 to the gear stand 7 for normal rotation of the tape is released (the tape and the head 2 may be in contact or not), and the reel stand 15 c f, 1 is driven at high speed with strong torque. Must.

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 15c is manually moved downward, the first reduction gear 1o and the reel stand gear 1 are moved downward as shown in FIG.
5b are engaged, while the winding gear 14 and the reel stand gear 15 are engaged with each other.
a leaves. Thereby, the flywheel gear a is directly connected to the reel stand 15c via the first reduction gear 1o, and the reel stand 15ci can be rotated with strong torque and at high speed.

In addition, regarding the moving mechanism of the reel stand 15C, the shaft 19 installed in 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 is always urged upward by a spring 20. This shaft 15d includes the reel stand 15C, the reel stand gear 16b, and the reel stand gear 1.
5a is press-fitted and rotates 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, thereby reeling the reel stand 15c.
is locked in the lowered position, and as described above, the reel stand gear 15b is engaged to enter the fast-forwarding state.

Next, reverse playback and reverse fast forward (rewind 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 movement mechanism described later, and the first reduction gear 1 rotates around the shaft 13.
o moves. As mentioned above, a small amount of movement will not separate the gear 10 from the flywheel gear a, 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, this engagement does not occur 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 25&. At this time, if the forward rotation flywheel 3 is rotating counterclockwise as in the normal rotation, the flywheel gear 9. 1st
Reduction gear 10. Second reduction gear 221 Reversing take-up gear 23
The rotational force is sequentially transmitted to the reel stand gear 25a, and the reel stand gear 25a rotates clockwise, and the tape can be wound up by the reel stand 25c, which rotates in unison 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 reduction gear 22 and the reversing take-up gear 23 in FIG. transmitting torque. This is independent of the slip mechanism for normal rotation described above, and the winding torque can be independently set for normal rotation, 9 reverse rotations.

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

In the reversal playback mode shown in FIGS. 5 and 6, the second reduction gear 22 and the reel stand gear 2tsb are separated in the vertical direction, but when viewed from the top view, they are in a position where they can be held together, and the reversal take-up gear 23 and the reel stand gear 25a are engaged. When the reel stand 25cf is moved downward by manual operation, the idler plate 12 is rotated clockwise by the idler movement mechanism in the same manner as during reverse playback, and the forward rotation reel stand gears 15a and 1rs are rotated.
b and the first reduction gear 1o are 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. The 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 configuration of the reel stand is the same as that for forward rotation, and by the locking member 21 entering the recess at the lower end of the reel shaft, the reel stand is locked in the lowered position, and the reel stand gear 25b is locked.
is stopped and the fast rewinding state is maintained. 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 plate 12 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 10, is connected to 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 first drive cam 31.

The relationship between the relay gear 3o and the drive cam 31 will be described below with reference to FIG. 9 (all, mountain, (C)) seen from above and FIG. 10 (barrel (I)) seen from the back.

Fig. 9 (The barrel is fully shown in the normal rotation state, the toothless part 3 of the drive cam 31
1a 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 FIG. direction fast forward l
)) When the solenoid 34 is sucked as shown in FIG. 10(b) by pushing the reel stand 25c into the mode, the locking member 35 gives initial rotation to the drive cam, and the relay gear 30a and drive cam 31 interlock. Therefore, as shown in FIG. 9(b), the forward rotation flywheel and the first reduction gear 10. Drive cam 31 from relay gears 30', 30a
A rotational force is applied to the shaft 32, and the shaft 32 moves along the cam surface. That is, the idler plate 12 rotates around the shaft 11 to the position 12' indicated by the dashed dotted line in FIG. Move to. In the inverted state, 1. The other missing tooth d[531b (located in a symmetrical position with the missing tooth portion 31a) of the drive cam 31 faces the relay gear 30a, and the rotation of the drive cam 31 is stopped, and the back side is similar to that shown in Fig. 1o (,). The positional relationship is established and the locking member 35 locks.

Next, if the mode is set to normal rotation regeneration or normal rotation fast forward mode, the solenoid 34 is attracted, the drive cam 31 is manually rotated as described above, and the idler plate 12 is moved back to the solid line position in FIG. Tighten.

As described above, according to this embodiment, the rotation of the idler plate 12 switches between normal rotation and reverse reproduction, and in each state, by moving the driven reel stand downward, fast forwarding in the rotation direction is performed. It becomes possible.

The pawl 9 controls the solenoid 34 so as to move the head of the pinch roller 8 for normal rotation forward by 8 degrees and move the idler plate 12 to the normal rotation side during normal rotation playback. During reversal reproduction, the solenoid 34 is similarly controlled to advance the reversal pinch roller 26 and the head and move the idler plate 12 to the reversal side (12'). During fast forwarding of forward rotation, by pushing the reel stand 15c 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 toward the forward rotation side. Similarly, when pressing the solenoid 34ff toward the reel stand 25ciT, the solenoid 34ff releases the pinch roller that is in contact with it at that time and moves the idler plate 12 to the reverse side (12'). :It has become possible to construct a very simple mechanism that allows for reciprocating movement if controlled, and this has 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 1o 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, the state of the above "font" will change when recording is performed at the same time.
It is hardly the same as the "recording" mode.

As described above, according to the present invention, the first reduction gear receiving power from the flywheel can be rotated in normal rotation and reverse rotation to transmit power to either of the two reel stands, and this power source is Furthermore, by sharing the power of the cam that generates this rotation, the structure is simplified and the number of parts is reduced, making it possible to achieve smaller size and lighter weight. It has the vague effect of greatly improving operability by enabling fast forward or reverse rotation by pushing the reel stand.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention during normal rotation, FIG. 2 is a side view thereof, FIG. 3 is a sectional view illustrating the operation of the take-up reel stand during normal rotation, and FIG. Figure 4 is a cross-sectional view for explaining the entire operation of the take-up reel stand during fast forwarding, Figure 5 is a plan view showing the operation during reversal, Figure 6 is a cross-sectional view for explaining the operation of the supply reel stand, and Figure 7 is a cross-sectional view for explaining the operation of the supply reel stand. A cross-sectional view for explaining the operation during early spring return, FIG. 8 is a plan view of the idler moving mechanism,
FIG. 9 (→, (b), ←) is a plan view showing the cam mechanism, and FIGS. 10 (a) and (b) are developed views of the cam mechanism. 1...Cassette, 3...Flywheel for forward rotation, 4...Flywheel for reverse rotation, 6...
...belt, 6...motor, a...
Forward rotation capstan, 9... Fist flywheel gear, 10... First reduction gear, 12... Idler plate, 14... Forward rotation winding gear, 15a, 1
5b...Forward rotation reel stand gear, 15c...
...Forward rotation reel stand, 22...Second reduction gear,
23...Reverse winding gear, 25a. 25b...Reel stand gear for reversal, 25C...
...Reversing sole stand, 30, 30a... Relay gear, 31... Drive cam, 31a, 31b...
...-Toothless part, 34... Solenoid. Name of agent: Patent attorney Toshio Nakao and one other person No. 9
Figure 31 Figure 10

Claims (1)

[Claims] In order to allow the tape to travel in both directions, the first and second tapes are rotated in different directions. a second capstan; a first capstan coaxial with the first and second capstans; a second flywheel, a flywheel gear that rotates integrally with the first capstan, a first reduction gear that always engages with the flywheel gear, and a forward rotation winding provided coaxially with the first reduction gear. Take gear and
an idler switching mechanism that pivotally supports the first reduction gear and switches the first reduction gear between a normal rotation position and a reverse rotation position while constantly engaging the first reduction gear and the flywheel gear; a normal rotation take-up reel stand gear that selectively engages with either the first reduction gear or the normal rotation take-up gear by vertical movement; the normal rotation take-up reel stand gear;
A take-up reel stand for forward rotation is provided coaxially with this take-up reel stand gear for forward rotation for winding up the tape, and a second reduction gear that engages with the first reduction gear at a position switched by the idler switching mechanism during reversal. a reversing take-up gear provided coaxially with the second reduction gear; and a reversing take-up reel stand gear that selectively engages with either the second reduction gear or the reversing take-up gear by vertical movement. and a reversing take-up reel stand provided coaxially with the reversing take-up reel stand gear for winding the entire tape, and the idler switching mechanism
By moving the reduction gear and selecting the reel stand to drive forward or reverse rotation, and moving the reel stand up and down,
A magnetic recording and reproducing device characterized in that the rotation system for reproduction feed and fast forward is changed, and the reel stand is driven in four modes: normal rotation, fast forward, and early spring return.