JPH05782B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a tape loading device that is most suitable for application to a magnetic recording/reproducing device such as a cassette video tape recorder. This invention relates to a tape loading device that loads a tape onto the circumferential surface of a rotating head drum using a guide block that slides on the tape.

[Background technology and its problems]

A tape loading device applied to a magnetic recording/reproducing device such as a cassette-type video tape recorder, in other words, a magnetic tape (hereinafter simply referred to as tape) is pulled out from within a tape cassette by a tape guide, and a rotating head drum (hereinafter simply referred to as In a tape loading device for winding a tape around a drum (referred to as a drum), a type in which a guide block to which a tape guide is attached is guided by a guide rail and positioned at the final loading position is often used.

Therefore, a conventional example of this type of tape loading device will be explained based on FIGS. 1 to 3. In this conventional example, a pair of guide blocks 2 and 3 that move along both sides of the drum 1 pull out the tape 5 from inside the tape cassette 4 mounted thereon, and wrap it around the circumferential surface of the drum 1 in a predetermined spiral state. The winding angle is close to 360°, and the winding is carried out in a substantially Ω-shape.

First, on a pair of guide blocks 2 and 3, there are three tape guides in a substantially triangular shape: a tape guide 6 consisting of a fixed pin called a neck tightening guide, and a pair of tape guides 7 and 8 consisting of rotating rollers. installed in the configuration. Next, the drum 1 is arranged vertically on a mechanical board 9, and a pair of guide rails 10 and 11 are arranged on both sides thereof to guide both guide blocks 2 and 3, respectively. These guide rails 10 and 11 are curved band-shaped plates arranged along the circumferential surface of the drum 1 in a substantially symmetrical manner. Note that both guide rails 10 and 11 have rail parts 12 and 13, respectively, and these rail parts 1.
Positioning block 1 connected at the tips of 2 and 13
4 and 15, and a guide groove 16 is formed along the center portion of each. Both guide blocks 2 and 3 are placed on both guide rails 10 and 11 with a pair of guide pins 17 and 18 fixed to their lower surfaces with a gap inserted into each guide groove 16. . Therefore, both guide blocks 2 and 3 slide on both guide rails 10 and 11 while being guided by both guide grooves 16, and move to a backward movement position shown by a phantom line and a forward movement position shown by a solid line in FIG. It is configured to be able to reciprocate between the two sides of the drum 1. The reciprocating movement of both guide blocks 2 and 3 is performed by a moving mechanism (none of which is shown) consisting of a ring gear, a connecting link, etc.

Therefore, when both guide blocks 2 and 3 are returned to the return position, these tape guides 6, 7, and 8 are at the same height as the tape 5 in the tape cassette 4, and both guide blocks 2 ，
When the tape guide 3 is moved forward to the forward movement position, these tape guides 6, 7, 8 have a height difference in the vertical direction with respect to the drum 1. However, in this forward position, the tape guides 6, 7, and 8 of one guide block 2 are lowered to a position lower than the height of the tape 5 in the tape cassette 4, and the tape guides 6 of the other guide block 3 are lowered to a position lower than the height of the tape 5 in the tape cassette 4. , 7, and 8 are raised to a position higher than the height of the tape 5 in the tape cassette 4. Therefore, both guide rails 10, 11
Of these, one 10 is inclined downward with respect to the horizontal plane from the backward movement position to the forward movement position, and the other 11 is inclined upward with respect to the horizontal plane from the return movement position to the forward movement position. There is. However, both guide rails 10 and 11 have an inclination along the helical angle of the tape lead 1a provided on the peripheral surface of the drum 1.

According to the tape loading device configured as above, first, as shown by the imaginary line in FIG.
When the tape cassette 4 is installed, both guide blocks 2 and 3 in the return position are relatively inserted inside the tape 5 in the tape cassette 4. Next, following the mounting of the tape cassette 4, both guide blocks 2 and 3 are guided by both guide grooves 16 by the moving mechanism and slide on both guide rails 10 and 11 to the return position. from arrow a
and starts forward movement (sliding) in the direction indicated by b. Then, each tape guide 6, 7, 8 of both guide blocks 2, 3 locks the tape 5, and the tape 5
are gradually pulled out to both sides of the drum 1 in front of the tape cassette 4. However, at this time, one of the guide blocks 2 gradually descends downward with respect to the horizontal plane as one of the guide rails 10 inclines, and the other guide block 3 moves down to the horizontal plane as the other guide rail 11 inclines. It gradually rises to the upper side. The tape 5 drawn out by these guide blocks 2 and 3 is gradually loaded (wound) around the circumferential surface of the drum 1 in a substantially Ω shape. Moreover, at this time, since the inclination of both guide rails 10 and 11 is along the helical angle of the tape lead 1a of the drum 1,
Each tape guide 6 of both guide blocks 2 and 3,
7 and 8 are reciprocated along an ideal movement locus along the helical angle of the tape lead 1a, and as a result, the tape 5 is moved along the helical angle of the tape lead 1a.
It is ideally loaded onto the circumferential surface of the drum 1 along the direction a.

The guide blocks 2 and 3 are thus transferred from the rail portions 12 and 13 of the guide rails 10 and 11 onto the positioning blocks 14 and 15 at the final stage of loading, which is the forward movement position. Then, each V groove 21 provided at the front end of each guide block 2, 3 is engaged with a pair of positioning pins 19, 20 fixed on both positioning blocks 14, 15, and both guide blocks 2, 3 are It is stopped at the final loading position. By placing both guide blocks 2 and 3 on both positioning blocks 14 and 15, each tape guide 6, 7, and 8 is positioned in the height direction, and the tape 5 is placed on the circumferential surface of the drum 1. Loading is completed in which the lead 1a is wound in a spiral manner along the lead 1a and in a substantially Ω shape with a winding angle of nearly 360°. Incidentally, the unloading of the tape 5 is performed by the reverse operation of the loading described above.

However, the conventional tape loading apparatus configured and operated as described above has the following problems. Although only one of the guide blocks 2, 3, the guide rails 10, 11, etc. will be explained here, the other is completely the same except for the inclination of the guide rail.

That is, as described above, the guide block 2 always moves the rail portion 12 of the guide rail 10 between the backward movement position and the forward movement position, which is the final loading position, during loading and unloading.
It will be slid over a long distance on the top.
For this reason, the lower surface of the guide block 2 is constantly rubbed by the upper surface of the rail section 12 and is forced to wear, resulting in wear and tear on the lower surface of the guide block 2. When considering the change over time when the guide block 2 is repeatedly slid, even if the guide block 2 is placed on the positioning block 14 of the guide rail 10 and positioned, the guide block 2 will move as shown in FIG. Another problem was that it became difficult to maintain the accuracy of the height H of each tape guide 6, 7, 8. In this type of tape loading device, if the precision of the height H of each tape guide 6, 7, 8 of the guide block 2 becomes incorrect, the winding condition of the tape 5 around the drum 1 deteriorates. is a serious defect.

Furthermore, in order to accurately position the guide block 2 at the final loading position and to arrange the guide rail 10 at an angle with respect to the horizontal plane, the guide rail 10 has conventionally been divided into two parts: a rail section 12 and a positioning block 14. I had no choice but to install it. For this reason, the guide groove 16 of the guide rail 10 is also divided into two, and the guide groove 1
6. In particular, there was a problem that the processing accuracy and assembly accuracy of the connecting portion (seam) 16a deteriorated. Due to the poor precision, the guide block 2 and the guide pins 17, 18 tend to get caught unexpectedly at the connecting portion 16a, resulting in defects that impair the smoothness of guiding the guide block 2.

[Purpose of the invention]

The present invention aims to provide a tape loading device that can solve the above-mentioned problems.

[Summary of the invention]

In the tape loading device described above, the present invention includes a sliding surface for sliding the guide block on the guide rail, and a positioning reference surface for positioning the guide block at the final position of loading. are provided with a step difference from each other, and the guide block has a sliding surface that slides on the sliding surface, and a positioning reference that is placed and positioned on the positioning reference surface. The reference surface to be positioned is maintained at a distance from the sliding surface during the loading of the guide block, and at the final position of the loading. The sliding surface is separated from the sliding surface, while the positioning reference surface is placed on the positioning reference surface for positioning, and the sliding of the guide block is Even if the tape guide is repeated, there is no change in the height direction over time, and the height accuracy of the tape guide at the final loading position can be maintained extremely reliably. Furthermore, there is no need to divide the guide groove of the guide rail, and the machining accuracy and assembly accuracy of the guide groove can be improved.

〔Example〕

An embodiment in which the present invention is applied to a tape loading device for a cassette type video tape recorder will be described below with reference to FIGS. 4 to 11. In addition, Figure 1~
Components that are the same as those in FIG. 3 are given the same reference numerals, and their explanations will be omitted. Further, although only one of the guide blocks 2, 3, the guide rails 10, 11, etc. will be explained here, the other is completely the same except for the inclination of the guide rail.

First, as shown in FIGS. 7 and 8, the lower surface of the guide block 2 has a central sliding surface 23.
and the positioning reference surfaces 24 on both outer sides of the sliding surface 23 are provided with stepped steps. Further, as shown in FIG. 6, a tapered surface 25 is formed at the front end of the reference surface 24 to be positioned.

On the other hand, as shown in FIG.
0 is formed by a rail part 12 and a positioning block 14 connected at the tip of the rail part 12, but the tip of the rail part 12 is provided with a convex part 27 that is approximately U-shaped, and the rail The guide groove 16 along the center of the portion 12 is formed to extend into the convex portion 27 . Therefore, the guide groove 16 is completely formed on the rail portion 12 side. The upper surface of the rail portion 12 is formed as a sliding surface 28 in the present invention. Further, the positioning block 14 is provided with a substantially U-shaped recess 29 into which the protrusion 27 of the rail portion 12 is fitted. The upper surface of the positioning block 14 is formed as a positioning reference surface 30 in the present invention. Note that there is a tapered surface 3 at the rear end of the positioning reference surface 30, which is the connection part side with the rail part 12.
1 is formed.

Next, as shown in FIG. 5, the rail portion 12 and the positioning block 14
is connected by being fitted into the recess 29 of the positioning block 14. Then, as described above, the guide pins 17 and 18 of the guide block 2 are guided by the guide groove 16, and the guide block 2 slides on the guide rail 10. As shown in FIG. 6, the rail portion 12 and the positioning block 14
When connected, the positioning reference surface 30 of the positioning block 14 is aligned with the sliding surface 28 of the rail section 12.
It is designed to have a step that is higher than the height. Note that the step h ₁ of the guide rail 10 between the sliding surface 28 and the positioning reference surface 30 is larger than the step h ₂ between the sliding surface 23 of the guide block 2 and the positioning reference surface 24 (h ₁ > h ₂ ) is formed.

The tape loading device of the present invention is constructed as described above. Then, the guide block 2 is reciprocated on the guide rail 10 in the same manner as described above. According to the invention, the guide block 2
The contact surfaces are completely different when the slider is slid on the rail portion 12 and when it is positioned on the positioning block 14 (the contact state is switched).

That is, as shown in FIGS. 6 and 7, the guide block 2 is inserted into the rail section 1 during loading.
2, the sliding surface 23 of the guide block 2 slides on the sliding surface 28 of the rail portion 12. And at this time, guide block 2
Since the reference surface 24 to be positioned has a step h ₂ with respect to the sliding surface 23, the reference surface 24 to be positioned is held spaced apart from the sliding surface 28 of the rail section 12. Ru. Therefore, guide block 2
The reference surface 24 to be positioned is never forced to wear by the sliding surface 28 of the rail portion 12.

Next, as shown in FIGS. 6 and 8, the guide block 2 is moved from the rail section 12 of the guide rail 10 to the positioning block 14 at the final stage of loading.
move on top. Then, at the final loading position, guide block 2 connects to positioning block 1.
When positioning with 4, guide block 2
The reference surface 24 to be positioned is the positioning block 14
is placed on the positioning reference surface 30 of. At this time, the step h ₁ between the sliding surface 28 of the guide rail 10 and the positioning reference surface 30 is formed to be larger than the step h ₂ between the sliding surface 23 of the guide block 2 and the positioning reference surface 24. Then, guide block 2
The sliding surfaces 23 of are spaced apart from the sliding surface 28 of the rail portion 12 by a step difference (h ₁ −h ₂ ). Therefore, the positioning of the guide block 2 at the final position of loading is performed using the positioning reference surface 30 of the positioning block 14 and the guide block 2.
The positioning is performed between the reference surface 24 and the reference surface 24 to be positioned. The positioning reference surface 30 of the guide block 2 is not worn out during loading.
Moreover, since there is very little sliding on the positioning reference surface 30 at the final stage of loading, the guide block 2 is accurately positioned on the positioning block 14. Even when sliding of the guide block 2 is repeated, there is no change over time in the height direction of the guide block 2 at the final stage of loading, and the height H of each tape guide 6, 7, 8 at the final position of loading. The accuracy can be maintained extremely reliably. Note that the guide block 2 moves from the rail portion 12 to the positioning block 14.
When transferring to the guide block 2, the tapered surface 25 provided at the front end of the positioning reference surface 24 of the guide block 2
However, the positioning reference surface 30 of the positioning block 14
Since the guide block 2 is guided by the tapered surface 31 provided at the rear end, the above-mentioned transfer of the guide block 2 is performed extremely smoothly. Further, at the final loading position, the sliding surface 23 of the guide block 2 is separated from the sliding surface 28 of the rail portion 12 within the recess 29 of the positioning block 14.

Further, according to the present invention, at the final loading position, the guide block 2 is positioned on the positioning reference surface 30 of the positioning block 14, which is completely different from the sliding surface 28 of the rail portion 12. Therefore, it is possible to extend the rail portion 12 of the guide rail 10 toward the positioning block 14 and fit it therein, and it is possible to completely form the guide groove 16 on the rail portion 12 side. Therefore, the machining accuracy and assembly accuracy of the guide groove 16 are improved, and the guide pins 17 and 18 of the guide block 2 can be guided extremely smoothly.

As described above, the present invention completely separates the relationship between the contact surfaces between the guide block 2 and the guide rail 10 during sliding and during positioning. As shown in FIGS. 9 to 11, the relationship between the contact surfaces can be modified in various ways in addition to those described above in terms of the arrangement of the contact surfaces and the relationship between the steps. The sliding surface 23 and positioning reference surface 24 of the guide block 2, the sliding surface 28 of the rail portion 12, the positioning reference surface 30 of the positioning block 14, etc. in FIGS. 9 to 11 are the same as in FIG. It is marked with a symbol.
Also, in any case, the step h ₁ of the guide rail 10
is larger than the step h ₂ of guide block 2 (h ₁
>h ₂ ) is formed.

[Application example]

The tape loading device of the present invention is not limited to the Ω method in which the tape 5 is wound around the peripheral surface of the drum 1 at a wrapping angle of approximately 360° as shown in the embodiments, but can be applied with various wrapping angles. Applicable to tape loading devices.

Furthermore, the present invention can be widely applied to various tape loading devices in addition to magnetic recording/reproducing devices such as cassette video tape recorders.

〔Effect of the invention〕

As described above, the present invention has a step on the guide rail between the sliding surface for sliding the guide block and the positioning reference surface for positioning the guide block at the final loading position. The guide block is provided with a step between the sliding surface that slides on the sliding surface and the positioning reference surface that is placed and positioned on the positioning reference surface. It was installed in the same condition. During loading, the positioning reference surface of the guide block is kept separated from the sliding surface of the guide rail, and at the final loading position, the sliding surface of the guide block is kept separated from the sliding surface. At the same time, the reference surface to be positioned is placed on the positioning reference surface for positioning.

Therefore, according to the present invention, the relationship between the contact surfaces between the guide block and the guide rail is completely different (the contact state is switched) during loading and at the final loading position, and the positioning of the guide block is Since the reference surface is not forced to wear by the guide rail during loading, there is no change in height over time even if the guide block slides repeatedly.
The height accuracy of the tape guide at the final position of loading can be maintained very reliably. In addition, the tape can be wound around the drum with extremely high precision at all times.

Furthermore, since the guide block is positioned at the final loading position using a positioning reference surface different from the sliding surface of the guide rail, there is no need to divide the guide groove of the guide rail. Therefore, the machining accuracy and assembly accuracy of the guide groove are improved, and the guide block can be guided extremely smoothly.

[Brief explanation of drawings]

1 to 3 show a conventional example of a tape loading device for a cassette-type video tape recorder, in which FIG. 1 is an overall perspective view, FIG. 2 is a plan view of the same, and FIG. FIG. 2 is a side view of the main part of the guide rail shown in cross section along the guide groove. 4 to 11 show an embodiment of a tape loading device for a cassette video tape recorder to which the present invention is applied, in which FIG. 4 is an exploded perspective view of the main parts, and FIG. 5 is the same as above. Fig. 6 is a side view showing the guide rail in a cross-section along the guide groove, Fig. 7 is a sectional view taken along the - line in Fig. 6, and Fig. 8 is a - line in Fig. 6. FIG. Moreover, FIGS. 9 to 11 are cross-sectional views similar to FIG. 8 in modified examples. In addition, in the symbols used in the drawings, 1...
Rotating head drum, 2, 3...guide block,
5... Magnetic tape, 6, 7, 8... Tape guide, 10, 11... Guide rail, 23... Sliding surface, 24... Positioning reference surface, 28... Sliding surface, 30... It is a positioning reference plane.

Claims (1)

[Claims] 1. A tape loading device that loads a tape onto the circumferential surface of a rotating head drum using a guide block that slides on a guide rail, and a sliding surface for sliding the guide block on the guide rail, and a tape loading device that loads the tape onto the peripheral surface of a rotating head drum using a guide block that slides on a guide rail. A positioning reference surface for positioning the block at the final loading position is provided with a step difference therebetween, and the guide block includes a sliding surface that slides on the sliding surface; A reference surface to be positioned which is placed on the reference surface for positioning and is positioned is provided with a difference in level from each other, and during loading of the guide block, the reference surface to be positioned is placed relative to the sliding surface. and at the final position of the loading, the sliding surface is separated from the sliding surface, while the positioning reference surface is placed on the positioning reference surface. A tape loading device characterized by positioning.