JPS6093660A - Loading mechanism of magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To remove a head cutting phenomenon by forming a wide part enabling leader to rotate by a prescribed angle in each groove having a V block on its one end on the other end part of the groove in a pair of grooves and forming a means applying turning force in a direction reducing the quantity of a magnetic tape wound around a slant pole at the initial time of loading operation to the loading leader. CONSTITUTION:A tape guide pole 8a and a slant pole 9a are fixed on the upper surface of the loading leader 7a and a guide 21a is fixed on the lower surface. A lever 23a projected so as to be sheared from a line connecting the center of the tape guide pole 8a to the center of the shaft 22a is coupled with the shaft 22a and a free end of a spring 12a is fixed on the leading end. Therefore, the spring 12 acts as force rotating the loading leader 7a in the clockwide direction. In said constitution, the quantity of the magnetic tape 3 wound around the tape guide pole 8a is increased. On the other hand, the quantity of the magnetic tape wound around a slant pole 9a is reduced.

Description

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

A magnetic recording/reproducing device includes a loading mechanism that pulls out a magnetic tape from a tape cassette and winds it around a rotating drum having a video head.

As this loading mechanism, a configuration has been proposed in which a pair of grooves are formed near the rotating drum, and a pair of loading leaders that move along the grooves move the magnetic tape to a loading position.

In this seed opening mechanism, as equipment and tape cassettes become smaller in size, a problem commonly referred to as the head cutting phenomenon has arisen.

This phenomenon will be explained below using the drawings.

FIG. 1 shows a plan view of a conventional magnetic recording/reproducing device, in which a rotating drum 2 having a video head is attached to a main body 1 so as to be rotatable by a drive device (not shown). A tape cassette 4 containing a magnetic tape 3 is housed at one end of the main body l. A loading mechanism pulls out the magnetic tape 3 from the tape cassette 4 and winds it around the rotating drum 2. A pair of loading mechanisms are formed on both sides of the rotating drum 2, and one end has a block 5a.

5b'i have grooves 6a, 6b, and loading leaders 7a, 7 are moved along the grooves 5a, 6b and are moved to the EJ function.
b is the main component. The loading leaders 7a and 7b are tape guide balls sa and s with flanges.
b and slant ball 9a.

9b and the wire 118 of the winding device it)
Driven along the grooves 6a and 6bK by ゜11b, ■
The loading state is reached at the position where it comes into contact with the blocks 5a and 5b. When the winding of the wire 11 by the winding iron basket 10 is released, the rolling leaders 7a and 7b are pulled into the groove 5a by the coil springs 12a and 12bK.

It is returned to the lower end in the figure 6b and enters the unloading state.

By the way, tape guide bows A/8a, 8b and slant bows/I/9 in loading leaders 7a, 7b
a, 9b are loading leader 7a.

The positional relationship was determined so that the position where the V-blocks 7b were in contact with the V-blocks 5a and 5b, that is, in the loading state, had a desired relationship with the rotating drum 2. Therefore, at the beginning of the operation of the loading mechanism shown in FIG. 2, that is, when the magnetic tape 3 begins to be wound around the rotating drum 2, the magnetic tape 3
0 The amount of winding is small, and the slant balls 9a, 9b
The amount of winding of the tape 30 in this case is 1x.

As a result, as shown in FIG. 3, the slant ball 9a acts to push the magnetic tape 3 upward, while the slant pole 9b acts to lower the magnetic tape 3 downward. In this way, the magnetic tape 3 wound around the rotating drum 2 is
At 1141j, the trajectory 13 of the video head protruding from the rotating drum 2 intersects with the lower edge, while at slant ball 9bllil, it runs below the drum lead 14, and the video head runs without hitting the edge of the tape 3. This results in the so-called head cutting phenomenon.

This head cutting phenomenon has become a serious problem because there is a danger that the magnetic tape will be cut if an attempt is made to increase the recording and reproducing time by making the magnetic tape thinner.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing apparatus that prevents the above-mentioned head cutting phenomenon and is equipped with a loading mechanism.

In order to achieve this objective, the present invention rotates the rolling leader so that at the starting position of winding the magnetic tape around the rotating drum, the amount of winding of the magnetic tape around the slant ball is reduced, unlike in the loading state. It is assumed that the configuration is such that it can be corrected.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A loading mechanism of a magnetic recording/reproducing apparatus according to the present invention will be explained below using an embodiment shown in the drawings.

The overall structure is the same as that shown in FIG. 1, and the rope swing mechanism, which is different from the conventional structure shown in FIG. 2, will be explained with reference to FIG.

FIG. 4 is a plan view showing the loading mechanism, showing l pairs of grooves 2 each having V-blocks 5a and 5bk at their upper ends.
0a and 20b each have a lower end with a swollen outer edge compared to the conventional grooves 6a and 6b. But rX2
The width of 0a, 20b is narrower than the length between the tape guide bows A/8a, 8b and the guides 21a, 21b, which will be described later, and the loading leaders 7a, 7b rotate once within the clear 2fJ a, 20b. It takes only one effort to do it. However, this groove 20a.

(2) The side ends of the blocks 5a and 5b have the same width as the conventional groove. Therefore, when the rolling leader 7b comes into contact with the V block 5b as shown by the two-dot chain line in the figure, the tape guide ball 8b' and the slant bow #9b'
take the same (predetermined ideal position) as before, and fully demonstrate their functions.

Each loading leader 7a, 7b has a guide 21a.
, 21b are respectively attached. Among these guides, the guide 21a will be explained with reference to FIGS. 5 and 6, which are a side view and a rear view of FIG. 4.

A tape guide ball 8a and a slant ball 9a are fixed to the upper surface of the loading leader 7a, that is, the left surface in FIG. 5, while a guide 21a is fixed to the lower surface, that is, the right surface in FIG. .

■ Block 5a on the groove side a, 2iJb mentioned above.

When the width near the end opposite to 5b is further measured, it is smaller than the length L of this kite 21a and larger than the width W shown in FIG. 6. A shaft 22a is provided protruding from the rear of the guide 21a, and the end of the wire lla is connected to this shaft 22a. Further, the shaft 22a is connected with a misaligned t/ha Z3a so as to be deviated from the line connecting the center of the tape guide bow A/8a and the center of the shaft 22a, as shown in FIG. The free end of the spring 12a in Figure 4 is fixed. Therefore, the spring 12a is the fourth
It acts as a force to rotate the loading leader 7ai in the figure in the direction of the hour hand.

Since the configuration of the rear surface of the loading leader 7b is similar or symmetrical to that of the loading leader 7a, the spring 12b acts as a force to rotate the loading leader 7b in FIG. 4 in the counterclockwise direction.

In this way, the loading leader 7a in FIG.
The lower end of the guide 21a is in contact with the left side of the guide 20a. Therefore, the tape guide ball 8
The amount of winding of the magnetic tape 3 at point a increases, and conversely, the amount of winding of magnetic tape 30 at slant bow A/9a decreases.

Therefore, the upward force exerted on the magnetic tape 3 by the slant bow A/9a is reduced, so that the magnetic tape 3 does not come off the flange of the tape guide ball 8a.

The loading leader 7b is biased counterclockwise, and the upper end of the guide 21b is in contact with the left side of the groove 2Ub, and the lower end of the guide 21b is in contact with the right side of the groove 21Jb. Therefore, the amount of winding of the magnetic tape 3 on the tape guide ball 8b increases, and conversely, the amount of winding of the magnetic tape 30 on the slant ball 9b decreases.

Therefore, the downward force that the magnetic tape 3 receives from the slant ball 9b is reduced, and the tape guide ball 8b
It will not come off between the flanges.

In this way, the head cutting phenomenon that occurs during the initial stage of winding the magnetic tape 3 around the rotating drum 2 is eliminated.

In the above embodiment, the connection parts between the wires 11a and llb and the loading leaders 7a and 7b, and the springs 12a, ],
2b and loading leader 7a, 7b connecting part position f
Since it is shifted to M', the wire 118.

The tensile force of 11b becomes a force that rotates the loading leader 7aft in the wound direction, and also causes the loading leader to rotate in the wound direction.
7bi It becomes a force that rotates in the counterclockwise dF direction. Therefore, the springs 12a, 12b and the wire 11a are used as means for applying rotational force in a predetermined direction to the loading leaders 7a, 7b.
, llb, or combinations thereof can be used.

In addition, in the embodiment shown in FIG. 4, a groove 2Lla having the same width as the conventional one is added only at the ends of the blocks 5a and 5b. There is a difference between the direction of the curve and the direction of the subsequent bay, and even in the conventional grooves 6a and 6b, the loading leader 7a is higher than the position shown in FIG.

When the magnetic tape 7b moves, the amount of winding of the magnetic tape 3 around the slant balls 9a and 9b decreases, so the width of the groove may be increased only in the vicinity where the magnetic tape 3 begins to wind around the rotating drum 2.

As described in each of the above embodiments, the slant bow/I/9a near the point where the magnetic tape 3 begins to wrap around the rotating drum 2
, 9b so that the amount of width of the magnetic tape 3 is reduced.

7bff: Since it rotates and extracts pressure, the grooves 20a and 2i
When forming the Jb, it is possible to place the lower end close to the rotating drum 2 so that it can be adapted to a small tape cassette.

As explained above, the present invention forms a wide part at the other end of a pair of grooves having a V block at one end, in which the loading leader can rotate by a predetermined angle,
The above p-ding leader is provided with means for applying a rotational force in a direction that reduces the amount of winding of the magnetic tape around the slant ball at the initial stage of the loading operation. It is possible to provide a loading machine m for a magnetic recording and reproducing device that eliminates the cutting phenomenon.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional magnetic recording/reproducing device, Fig. 2 is an enlarged view of the loading mechanism shown in Fig. 1, Fig. 3 is a front view of Fig. 2, and Fig. 4 is an embodiment of the present invention. Fig. 51 is a side view of the rope initiator shown in Fig. 4, and Fig. 6 is a rear view of the loading leader shown in Fig. 4. 2... Rotating drum, 3... Magnetic tape, 5a. 5b...■Block, 7a, 7b...
Rotating leader, 8a, 8b...Tape guide ball with flange, 9a, 9b...Slant bow y111a, llb...Wire, 1
2a, 12b... Spring, force a, force b...
-Groove, 21a, 21b...Guide. Figure 1

Claims (1)

[Claims] A pair of grooves each having a V block at one end are formed on both sides of the rotating drum, and a loading leader is provided which moves within each groove so as to wind the magnetic tape around the rotating drum. In the loading mechanism of the magnetic recording main device each having a slant ball, the width of the loading leader of 1L near where the loading leader is located when the magnetic tape starts to be wound around the rotating drum is such that the loading leader can rotate by a predetermined angle. A loading device for a magnetic recording and reproducing device, characterized in that the loading leader is provided with means for applying a rotational force in a direction to reduce the amount of winding of the magnetic tape around the slant ball at the initial stage of a loading operation.