JPH0377580B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape loading mechanism for a magnetic recording/reproducing device.

As a conventional tape loading mechanism for a magnetic recording/reproducing apparatus, the one shown in FIG. 1 is known.

Chassis 3, which is placed parallel to cassette 1, has
A pair of grooves 13 located on both sides of the drum cylinder 5
a, 13b are formed, and these grooves 13a, 1
Leaders 4a, 4b movably fitted within 3b draw the tape from the cassette 1 and wind it around the drum cylinder 5. Positioning members 6a, 6b having V-shaped protrusions for stopping the leaders 4a, 4b at predetermined positions near the drum cylinder 5 are provided at the upper ends of the grooves 13a, 13b.

FIG. 2 is an enlarged view of the leader 4a, in which a slant pole 8 and a guide roller holding part 10 are integrally formed in the leader body 7, and a cylindrical boss 11 with a diameter smaller than the width of the groove 13a and a guide roller are provided on the lower surface. A downward protrusion of the roller holding section 10 is formed. The cylindrical boss 11 is integrally provided with a pin 12 that receives a moving force via a driving force transmitting body 15. The leader 4a is fitted into the groove 13a from above at the lower end of the cylindrical boss 11 and the guide roller holding portion 10, and in this state, the stop shaft 14 is attached to restrict vertical movement in the chassis 3.

The leaders 4a, 4b reciprocate along the loci of the grooves 13a, 13b by receiving a force parallel to the chassis 3 from the driving force transmitting body 15 on the pin 12 in some way. Therefore, the grooves 13a, 13b
By freely changing the trajectory of the tape, the tape can be pulled out from the cassette 1 and wound around the drum cylinder 5, and the vertical guide roller 9 and the slant pole 8 can be moved to the positioning members 6a and 6b in order to install them at the desired positions (or A reverse stroke) can be performed in the grooves 13a, 13b.

FIG. 3 shows the configuration of the positioning member 6a, and FIGS. 4 and 5 show the fitted state of the leader 4a and the positioning member 6a.

When a force P from the driving force transmitting body 15 is applied to the reader 4a from a direction at an angle θ with respect to the X-ray as shown in FIG. 5, a force of Pcos pushes the reader 4a in the X direction,
The leader 4a is positioned by the contact between the V-shaped protrusion of the positioning member 6a and the guide roller holding part 10, and a moment about the contact part a is applied to the lower surface of the leader body 7 and part b, and the leader 4a is moved. The levelness of Furthermore, the force Psin〓 gives a moment that causes the leader 4a to rotate in the Y direction about the center of the guide roller holding part 10,
Press the side surface c of the cylindrical boss 11 against the side surface of the groove 20 (FIG. 3) of the positioning member 6a, and
Determine the orientation of in the horizontal plane. In this way, the positions and orientations of the slant poles 8 and vertical guide rollers 9 of the leader 4a are determined.

Since the conventional loading mechanism had the above-described configuration, it was difficult to polish the inner guide surfaces of the grooves 13a and 13b smoothly, and the positioning member 6
Leaders 4a and 4b are in groove 1 until reaching a and 6b.
When sliding the reader bodies 3a and 13b, the side c portions necessary for positioning and the lower surfaces of the leader bodies 7a and 7b are worn, making subsequent positioning unstable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape loading mechanism for a magnetic recording/reproducing apparatus that can accurately maintain the position and orientation of the leader while minimizing wear caused by movement of the leader.

The present invention has a leader in which a slant pole and a vertical guide roller are attached to the reader body, and the movement of the leader pulls out the magnetic tape from the cassette and winds it around the drum cylinder, and the positioning member In a tape loading mechanism of a magnetic recording/reproducing device that determines the position and orientation of a leader, a belt-shaped guide plate is provided to guide the movement of the leader, and a flange of a cylindrical guide pin fixed to the reader body is connected to the belt-shaped guide plate. The leader is mounted on the upper side of the guide plate and is slidably suspended from the band-shaped guide plate, and the band-shaped guide plate has a curved surface on the upper side that contacts the flange, and the leader is placed on the upper side of the guide plate. It is characterized in that it is arranged between the supported cylindrical guide roller holding part and the guide pin, and the guide surface of the band-shaped guide plate can be easily polished and smoothed. With this configuration, even if the hanging engagement portion with the band-shaped guide plate is worn out due to the operation of the leader, the position and orientation of the leader will not be affected in any way.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 6 is a plan view, in which a pair of band-shaped guide plates 16a and 16b are arranged on both sides of the drum cylinder 5, and are fixed to the chassis 2 or another chassis at both ends while floating a predetermined distance from the chassis 2. ing. As shown in FIG. 9, for example, the band-shaped guide plates 16a and 16b are formed by bending a thin plate-like body into two, and by this bending, a curved surface is formed on the upper side surface. And this belt-shaped guide plate 1
6a and 16b are provided at positions corresponding to conventional grooves, and have a necessary width in the vertical direction, that is, in the direction perpendicular to the chassis 2. Positioning members 6a, 6 are provided at one end of the band-shaped guide plates 16a, 16b.
b are each fixed. Leader 4a, 4
b is constructed as shown in FIGS. 7 and 8.

The leader 4a is different from the conventional example in that it is configured by attaching a slant pole 8, a vertical guide roller 9, a cylindrical guide roller holding part 10, a cylindrical boss 11, a pin 12, and a driving force transmitting body 15 to the reader main body 7. Although similar, the difference is that a cylindrical guide pin 17 and a flange 18 are provided above the leader body 7.

A flange 18 is hung on the upper side surface of the band-shaped guide plate 16a, so that the leader 4a is suspended from the band-shaped guide plate 16a. Strip guide plate 1
6a is arranged between the guide pin 17 and the guide roller holding part 10. As shown in FIG. 7, the force applied to the leader 4a through the driving force transmitting body 15 imparts a counterclockwise rotational moment to the leader 4a. As a result, the belt-shaped guide plate 16a
The guide roller holding part 10 is pressed against the
In particular, since the contact surface of the band-shaped guide plate 16a is a surface of a material, the frictional force is small, and as a result, wear can be extremely reduced, and the direction of the leader 4a can be kept constant. Regarding the space between the upper side surface of the band-shaped guide plate 16a and the flange 18, since the upper side surface of the band-shaped guide plate 16a forms a curved surface, the flange 18 and the upper side surface of the band-shaped guide plate 16a are in line contact. The frictional force is small, and wear can be reduced accordingly. In the above embodiment, the curved surfaces are formed on the upper side surfaces of the band-shaped guide plates 16a and 16b by bending them, so that the curved surfaces can be easily formed. However, the present invention is not necessarily limited to bending in this way, and the upper portion of a single plate-like body may be curved.

Although detailed illustrations are omitted, the band-shaped guide plate 16a,
16b extends to the rear of the V-shaped projections of the positioning members 6a, 6b, and when the leaders 4a, 4b move to the extended ends, the leaders 4a, 4b
are held in a predetermined position by positioning members 6a and 6b as in the conventional case.

FIG. 10 shows an embodiment in which the friction between the leader 4a and the strip-shaped guide plate 16a is further reduced, and a roller 19 is attached to the guide pin 17 to reduce the friction between the guide pin 17 and the strip-shaped guide plate 16a.

FIG. 11 shows still another embodiment, in which the flange 1
A drop-off prevention portion 18a is formed at 8. This drop-off prevention portion 18a connects the flange 18 to the belt-shaped guide plate 16.
The belt-shaped guide plate 16a is held between the guide pin 17 and the drop-off prevention portion 18a to prevent the leader 4a from falling off.

The tape loading mechanism described in each embodiment has various advantages over conventional configurations. First, when the leader 4a is guided by a groove, the chassis 3 is used as a strength member to maintain the groove shape against the applied driving force, which results in an increase in size and limits the arrangement of nearby components. In the embodiment, since a pair of band-shaped guide plates 16a and 16b are used, the nearby space can be utilized for other components. In addition, the band-shaped guide plates 16a, 16
b, the outer surface is easier to machine than grooves, and wear resistance can be significantly reduced, and changes in the holding direction due to wear can be prevented.

As explained above, in the present invention, the guide pin, flange, and guide roller holding portion of the leader used for positioning are all in line contact with the band-shaped guide plate, and the frictional force accompanying the movement of the leader can be reduced. This prevents the guide pins, flanges, guide roller holding portions, and band-shaped guide plates from being worn out, making it possible to accurately maintain the position and direction of the leader.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a conventional tape loading mechanism, Fig. 2 is a side view of the main part of Fig. 1, Fig. 3 is a perspective view of the positioning member shown in Fig. 1, and Figs. 4 and 5 are FIG. 1 is a side view and bottom view showing the positioning state; FIG. 6 is a plan view showing a tape loading mechanism according to an embodiment of the present invention; FIGS. 7 and 8 are main parts of FIG. 6. top and side views;
FIG. 9 is a perspective view showing a band-shaped guide plate, FIGS. 10 and 11 are side views showing main parts of tape loading mechanisms according to different embodiments of the present invention,
FIG. 4a, 4b... Leader, 6a, 6b... Positioning member, 7... Leader body, 8... Slant pole, 9... Vertical guide roller, 10... Guide roller holding part, 16a, 16b... Band-shaped guide plate , 17...guide pin, 18...flange.

Claims (1)

[Claims] 1 It has a leader consisting of a slant pole and a vertical guide roller attached to the reader body, and by the movement of this leader, the magnetic tape is pulled out from the cassette and wound around the drum cylinder, and at the same time, the position of the leader is determined by the positioning member. In a tape loading mechanism of a magnetic recording/reproducing device, the tape loading mechanism of a magnetic recording/reproducing device is provided with a belt-shaped guide plate for guiding the movement of the leader, and a flange of a cylindrical guide pin fixed to the reader body is connected to the belt-shaped guide plate. The leader is placed on the upper side surface and is slidably suspended from the band-shaped guide plate, and the band-shaped guide plate has a curved surface formed on the upper side surface that contacts the flange, and has a circular shape that supports the vertical guide roller. 1. A tape loading mechanism for a magnetic recording/reproducing device, characterized in that the tape loading mechanism is disposed between a columnar guide roller holding section and the guide pin.