JPH0413779Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a loading mechanism for a magnetic recording/reproducing device.

[Background of the idea]

A loading mechanism of a magnetic recording/reproducing device is used to pull out a magnetic tape from a tape cassette and wind it onto a rotating cylinder. An example thereof will be explained with reference to FIGS. 5, 6, and 7.

A pair of grooves 8 are formed on both sides of the rotary cylinder 7 in the upper chassis 1, which is provided at a predetermined distance from the lower chassis. A V-block 9 is fixed to the upper end of this groove 8, and this V-block 9 determines the final position and attitude of the leader 3 moving along the groove 8. The leader 3 has a slant pole 4 and a vertical pole 5. Both poles pull out a magnetic tape (not shown) from inside the tape cassette, and when the leader 3 collides with the V-block 9, the magnetic tape is wound around the rotating cylinder 7. do.
The movement of the leader 3 is carried out along the shape of the groove 8, but there is a groove 8 on the opposite rotation cylinder side of the groove 8.
A pair of guides 31 forming a gap 30 parallel to
a, 31b, which are fixed to the lower chassis, for example. The guides 31a and 31b are, for example, a pair of parallel upright flat plates, and a predetermined gap 30 is formed at the opposing portions of the guides. Leader 3 and Communication Means 3
It is also used to move the connection between two parts.
One end of the transmission means 32 is connected to the leader 3, and the other end is connected to the winding body 13 shown in FIG.

The leader 3 has the lower part of the vertical pole 5 and the lower pin 6 fitted in the groove 8, and both move while sliding on the side walls of the groove 8. At the free end of the joint plate 34 rotatably connected to the reader body 33 by a lower pin 6, a holder 35 is attached to a pin 36.
are rotatably connected by. Furthermore, one end of the transmission means 32 is connected to this holder 35. The transmission means 32 is, for example, a steel plate-shaped body, which is deformable along the gap 30 and along the roller 10 and the winding body 13, and is also deformable within the width of the gap 30. It is constructed so that it can be returned to its original position by elasticity. The connecting portion between the transmission means 32 and the holder 35 is connected to the gap 3.
It moves along 0.

Inner guide 31 near roller 10
b is omitted, and then the pair of guides 31a,
31b, and the inner guide 31b is omitted again near the winding body 13, which will be described later. Since the movement range of the leader 3 is up to the vicinity of the roller 10 as determined by the groove 8, it is only necessary that the connecting portion between the transmission means 32 and the holder 35 can move in this area. Therefore, in this part, the gap 30 is open to the outside, and in other parts, the gap 30 does not need to be open to the outside, as in the case of a pipe, as long as there is no problem in inserting the transmission means 32.

A similar guide is configured for the right leader 3 of the rotary cylinder 7, but is not shown here.

The transmission means of both leaders 3 configured as described above are connected to a drive device shown in FIG.
That is, the other ends of both transmission means 32 are connected to the winding body 13. This winding body 13 has a spring 14 provided between it and a worm wheel 15 arranged coaxially.
are connected in the rotational direction via. A worm gear 16 meshed with a worm wheel 15 is connected to a motor 18 via a belt 17.

To move the leader 3 from position A to position B in FIG. 5, the motor 18 rotates the winding body 13 clockwise to wind up the transmission means 32. At this time, since the groove 8 that determines the movement trajectory of the leader 3 and the gap 30 that restricts the position of the transmission means 32 are parallel, the joint plate 34 and the leader body 33 always move while maintaining substantially the same relationship. Therefore, the force required to drive the reader 3 is always approximately constant, and the drive device can be configured to be compact accordingly. When the leader 3 is fitted into the V-block 9, the winding body 13 is prevented from rotating in the same direction, only the worm wheel 15 is rotated by a predetermined angle, and the motor 18 is stopped. Therefore, the spring 14 is biased, and this biasing force holds the leader 3 in a fitted state with the V-block 9.

Next, move the reader 3 from position B to position A in FIG.
The case of driving to will be explained. motor 18
is rotated in the opposite direction to the previous direction, and the leader 3 is driven via the transmission means 32 in the gap 30. after that,
When the leader 3 reaches the lower end of the groove 8, the motor 1
8 overstrokes by a predetermined amount, and the transmission means 32 closes the gap 30 by an amount corresponding to the stroke.
The retaining force of the leader 3 is obtained by bending and absorbing the force within the leader 3, or by compressing and absorbing the force if the spring 14 is already bent during operation.

One of the problems with the loading mechanism having such a configuration is that the load on the motor is large, so the driving device for the loading mechanism becomes large in size. In other words, the spring 14 shown in FIG. 7 must be relatively strong enough to generate a force that keeps the leader 3 in contact with the V-block 9 when loading is complete, but when the motor 18 overstrokes, This spring 14 directly connects the motor 18
It becomes a burden. In addition, the clutch plate 19 is
Although it is configured not to transmit torque exceeding a set value, since it acts equally in both rotational directions, it must be set to allow for the maximum overstroke after the above-mentioned loading completion state. Therefore, the holding force after the unloading state, which requires a much smaller force than at this time, becomes more force than necessary due to the above-mentioned setting torque, and undesired force in the compression direction is applied to the transmission means.

[Purpose of invention]

An object of the present invention is to provide a loading mechanism having a compact drive device.

[Summary of the idea]

To achieve this objective, the invention connects a leader to the other end of the transmission means, one end of which is wound up by a motor, and the holding force of said leader to the V-block is at least equal to the overstroke by said motor. In the loading mechanism of the magnetic recording and reproducing device, the loading mechanism is provided with a rotating collar and a rotating stopper coaxially with the wheel rotated by the motor and rotatable with respect to each other. A first spring is connected to the rotating collar and applies a rotational force to the rotating stopper that causes the leader to contact the V-block; and a first spring is connected to the rotating collar and the rotating stopper, and connects the leader to the V-block. and a second spring that applies a rotational force to the rotation stopper to hold it in the opposite position, and a first engagement portion is provided between the wheel and the rotation collar to rotate both together,
A second engaging portion is provided between the rotating collar and the rotating stopper to rotate both together, and a holding link capable of engaging with and locking the rotating stopper; A third spring is provided to apply a rotational force to the rotary stopper via a retaining link to bring the leader into contact with the V-block when engaged with the rotary stopper, and the wheel is engaged with the rotary stopper and the retaining link. The structure includes a disengagement member that releases the engagement, thereby dividing the holding force in the loading completed state into two, the holding force due to the first spring and the holding force due to the third spring. The holding force by the spring 3 is made not to act as a holding force in the unloading direction, and the biasing force in the loading direction is made so that both holding forces do not act as a load on the motor at the same time.

[Example of idea]

The present invention will be explained below with reference to embodiments shown in the drawings.

Figure 1 shows a transmission means 3 with one end connected to a reader.
2 shows the drive of the loading mechanism at the other end of FIG.

A wheel 41, a rotating collar 42, and a rotating stopper 43 are each rotatably supported in this order from below on a support column 40 fixed to the chassis. The outer periphery of the wheel 41 is connected to the transmission means 32.
Although not shown, it has a coaxially integrated worm wheel, which is connected to the motor via the worm gear and belt as shown in Fig. 7. There is. Therefore, the motor rotates the wheel 41 clockwise and counterclockwise. The rotating collar 42 has a first
The rotational direction is related to the rotational direction through a spring 44. The outer periphery of this rotating collar 42 has approximately 1/2
A positioning portion 42a, which is a standing portion having about four circumferences, is formed. The rotation stopper 43 has a pair of arms 43a, 43b at the upper and lower parts of the figure, and the rotation of the rotation stopper 43 is regulated by the arms 43a, 43b colliding with both ends of the positioner 42a. In other words, the positioner 42a stands higher than the arms 43a and 43b. A second spring 45 is also arranged between the rotating collar 42 and the arm 43b to provide a relationship between the rotations of the two. In order to limit the height of these three coaxial components, for example, the rotating collar 42 may be formed into an annular shape and rotatably disposed around the outer periphery of the rotating stopper 43.

The wheel 41 is provided with a stopper 46, the rotating collar 42 is provided with a claw 42b,
When the stopper 46 comes into contact with the claw 42b, the wheel 41 rotates integrally with the rotating collar 47.

Stopper 46 provided on the wheel 41 described above
and a claw 42b provided on the rotating collar 42 constitute a first engaging portion that rotates the wheel 41 and the rotating collar 42 integrally, and
Positioning 42a provided on the rotating collar 42 described above
The arm 43b provided on the rotation stopper 43 constitutes a second engaging portion that rotates the rotation collar 42 and the rotation stopper 43 together.

A pin 4 is attached to the upper part of the arms 43a and 43b, respectively.
7. A roller 48 is attached.

The driving device side end of the transmission means 32 is fixed to the lower part of the arm 43b, so that the leader is driven in the loading direction on the V block side by clockwise rotation of the rotation stopper 43, and also in the counterclockwise direction. is driven in the unloading direction by the rotation of .

The retaining link 50 rotatably supported around the column 49 is rotated counterclockwise by a third spring, that is, a torsion spring 51, which provides a rotational force to the rotation stopper to bring the leader into contact with the V-block. A force is applied and the limit of rotation in the same direction is determined by a stopper 52.
A tapered surface that comes into contact with the roller 48 is formed at the tip of the retaining link 50, and a retaining link mechanism is configured with the retaining link 50 at the center. The retaining linkage operates via rollers 48 to maintain the engaged position with the rotation stopper 43.

A release mechanism disengages the holding link mechanism from the rotation stopper 43, and is made up of a pin 53 provided at the tip of the holding link 50 and an engagement release member formed in a chevron shape on the outer periphery of the wheel 41, that is, a cam 41a. configured. Rotation stopper 43 is released by counterclockwise rotation of wheel 41 which causes cam 41a to act on pin 53 to impart clockwise rotation to retaining link 50.

Here, looking at the force relationships between the springs 44, 45, and torsion springs 51, the force that requires the greatest force to drive and hold the leader is the force that holds the leader in position during the loading state. Conventionally, this position holding force was achieved by spring 4.
However, in this embodiment, the position holding force is generated by the torsion spring 51.

Figure 1 shows the loading completed state.
The wheel 41 is rotated clockwise by a motor (not shown) to bring the leader into contact with the V block,
Thereafter, the wheel 41 overstrokes by a predetermined angle, biasing the spring 44. The retaining linkage engages the roller 48 of the rotation stopper 43. The biased spring 44 rotates the rotation collar 42 clockwise via the claw 42b, presses the positioning 42a against the arm 43b, and closes the rotation stopper 4.
3 gives a clockwise force. Further, the torsion spring 51 applies a clockwise force to the rotation stopper 43 via the holding link 50, and the clockwise force thus applied to the rotation stopper 43 is applied to the leader 3 shown in FIG. V block 9
It acts as a holding force in the state of contact.

Next, to explain the case where the leader is driven in the unloading direction, when the wheel 41 is driven counterclockwise by a motor (not shown), the wheel 41 is moved by the spring 44 as shown in FIG.
is returned to its original state, and before the stopper 46 of the wheel 41 collides with the pawl 42b, the wheel 4
The cam 41a of No. 1 hits the pin 53, and the holding link 5
0 in the clockwise direction against the torsion spring 51 to disengage the roller 48. In other words, the release mechanism disengages the rotation stopper 43 from the holding link mechanism.

After that, the stopper 46 collides with the pawl 42b,
The rotating collar 42 rotates counterclockwise together with the wheel 41, resulting in the state shown in FIG. In this state, the leader 3 shown in FIG. 5 has reached the lower end of the groove 8.
At this time, the pin 47 of the arm 43a of the rotation stopper 43 is in contact with the holding link 50, preventing the rotation stopper 43 from rotating in the counterclockwise direction. Thereafter, as the motor rotates further for other tasks such as braking, the rotating collar 42 along with the wheel 41 will further overstroke, now stretching and biasing the spring 45 as shown in FIG. The biasing force of the spring 45 applies a counterclockwise force to the rotation stopper 43, and therefore serves to hold the leader 3 in position A in FIG.

Next, to transition to the loading state again,
This is done by rotating the wheel 41 clockwise from the state shown in FIG. 4 by a motor (not shown). The positioning 42a of the rotating collar 42 rotated in the same direction via the spring 44 at the beginning of this rotation is such that its clockwise rotating end abuts the arm 43b, causing the rotating stopper 43 to also rotate clockwise. After passing through the state shown in FIG. 3, the state shown in FIG. 2 is reached. In this state, the leader comes into contact with the V-block 9 as shown in position B in FIG. to strengthen As the cam 41a further rotates clockwise from the state shown in FIG. 2, the holding link 50 also rotates counterclockwise along the cam surface, and the holding link 50 engages with the roller 48 as shown in FIG. Since the roller 48 has a larger diameter than the pin 47 of the arm 43a, the retaining link 50 is floating above the stopper 52, so that the spring force of the torsion spring 51 acts on the roller 48, causing a clockwise force on the rotation stopper 43. 5 to maintain the state in which the leader 3 shown in FIG. 5 is in pressure contact with the V block 9.

As can be seen from the above explanation, maintaining the loaded state, which requires the greatest force among the driving and holding of the leader, is achieved by the spring biased by the overstroke of the wheel 41, as shown in FIG. 44 and a torsion spring 51 that is biased independently of the drive of the motor, and the timing when the cam 41a moves against the torsion spring 51 and the timing when the spring 44 is biased completely overlap. The cam 41a in the state shown in FIG.
Since the motor acts on the pin 53 at a position distant from the motor, the load acting on the motor is smaller than that of the conventional motor, and the driving device of the loading mechanism can be made smaller. Therefore, even if a clutch plate is configured in the drive device as in the conventional case, the clutch plate only needs to be configured from the torque corresponding to the spring 44, so the force applied to the transmission means 32 can be reduced, and the transmission means 32 can be made smaller. It can be simplified with

In the above embodiment, the stroke of the leader 3 is set to half a rotation of the rotation stopper 43;
It can be set arbitrarily by changing the positions and diameters of a and 43b.

[Effect of idea]

As explained above, the present invention uses the spring 44 and the torsion spring 51 to maintain the holding force in the loading completed state.
Since the torsion spring 51 is a self-rotating holding link mechanism that applies leader holding force through rotation, the motor load is reduced and the drive device can be made smaller, and it is also smaller than before. The spring 44 does not apply undesired compressive force to the transmission means 32. In addition, since a self-rotating holding link mechanism is used, when releasing the force of the torsion spring 51, the force that resists it can be made small due to the lever ratio. It will not be made large.

[Brief explanation of drawings]

Fig. 1 is a plan view of a loading mechanism according to an embodiment of the present invention, Figs. 2 to 4 are plan views explaining the operation of the loading mechanism of Fig. 1, and Fig. 5 is a plan view of the loading mechanism proposed earlier. FIG. 6 is a partially sectional side view of the loading mechanism of FIG. 5, and FIG. 7 is a plan view of the driving device of the loading mechanism of FIG. 5. 3... Leader, 8... Groove, 9... V block, 32... Transmission means, 41... Wheel, 41
a...Cam (disengagement member), 42...Rotating collar, 43...Rotating stopper, 43a, 43b...
...Arm, 44...First spring, 45...Second spring, 48...Roller, 50...Retaining link, 5
1... Torsion spring (third spring), 53...
pin.

Claims (1)

[Scope of utility model registration request] A leader is connected to the other end of the transmission means, one end of which is wound up by the motor, and the holding force of the leader to the V-block is provided by at least a spring biased by the overstroke of the motor. In the loading mechanism of the recording and reproducing device, a rotating collar and a rotating stopper are provided coaxially with the wheel rotated by the motor and rotatable with respect to each other, and
A first spring connects the wheel and the rotating collar, and provides the rotating stopper with a rotational force that brings the leader into contact with the V-block, and connects the rotating collar and the rotating stopper, and connects the leader. A second one that applies rotational force to the rotation stopper to hold it in a position opposite to the V block.
a spring; a first engaging portion between the wheel and the rotating collar that rotates both integrally; and a second engaging portion between the rotating collar and the rotating stopper that rotates both integrally. a holding link that can engage with and lock the rotation stopper; and a holding link that connects the leader to the rotation stopper via the holding link when the holding link and the rotation stopper are engaged. A magnetic recording and reproducing device characterized in that a third spring is provided to apply a rotational force to bring the V block into contact with the V block, and an engagement release member is provided on the wheel to release the engagement between the rotation stopper and the holding link. loading mechanism.