JPH06162627A - Rotating drum apparatus of magnetic recording/ reproducing apparatus - Google Patents

Abstract

PURPOSE:To reduce the damage of a tape at the unloading time and to hold the linearity of the tape pattern at a helical lead of the tape. CONSTITUTION:The apparatus is provided with a parallel loading mechanism which draws out and winds a tape 1 by means of a feeding guide roller and a winding guide roller, etc., from both sides of a rotary drum 9. The rotating drum 9 has a lower drum 9b where a helical lead 16 to regulate running of the tape is formed. A recessed part 16a is formed at the winding side of the tape of the helical lead 16. Moreover, points A, B, C corresponding to the entrance, center and exit of the running tape are aligned approximately on the same line at an edge of the helical lead 16 of the lower drum 9b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drum device of a magnetic recording / reproducing device such as a VTR.

[0002]

2. Description of the Related Art Generally, in a magnetic recording / reproducing apparatus adopting a helical scan method, a parallel loading mechanism (M loading) in which two loading posts pull out a magnetic tape from a cassette and wind it around a rotary drum is used as a tape loading mechanism. Mechanism) is often adopted.

In the magnetic recording / reproducing apparatus, as shown in FIG. 4, for example, the rotary drum 3 tilted in the direction of arrow X '.
9, a tension pole 34, a supply-side fixed guide 35, a supply-side guide roller 36, a supply-side impedance roller 37, and a supply-side inclined post 38 are provided on the tape supply side of the rotating drum 39. On the tape winding side, a winding side inclined post 40, a winding side guide roller 41, a capstan shaft 42, a pinch roller 4
3 and a drawer post 44 are provided.

Among these, the supply side guide roller 36, the supply side inclined post 38, and the winding side inclined post 4
0 and the winding side guide roller 41 are respectively arranged on the same pole base, and are movable in the direction of pulling out the magnetic tape (hereinafter, simply referred to as tape) 31, and the tape 31 is pulled out to the rotary drum 39. It is designed to be wrapped. Further, the supply-side inclined post 38 and the winding-side inclined post 40 have the tape 31 on the inclined rotating drum 39.
Is provided so as to be able to stably guide the rotating drum 39 according to the inclination of the rotating drum 39.

The tape 31 used in the magnetic recording / reproducing apparatus is contained in a cassette 32 having a supply reel 33 and a take-up reel 45, as shown in FIG.
When the cassette 32 is inserted into the apparatus, the cassette lid (not shown) is opened to expose the tape 31.

Further, as shown in FIG. 5, the rotating drum 39 is provided so as to be inclined in the arrow X'direction so that the tape supply side is on the lower side and the tape winding side is on the upper side. The rotating drum 39 is composed of a rotating upper drum 39a and a fixed lower drum 39b. The lower drum 39b has guide grooves (hereinafter, referred to as guide grooves) for restricting the running of the tape 31.
A helical lead) 46 is provided. still,
The helical lead 46 is usually formed to have an inclination smaller than the inclination of the rotary drum 39.

The loading mechanism of the tape 31 will be described below with reference to FIGS. 4 and 5.

First, when the cassette 32 is inserted into the apparatus, the cassette lid (not shown) is opened to expose the tape 31. At this time, the tension pole 34, the supply-side guide roller 36, the supply-side inclined post 38, the winding-side inclined post 40, the winding-side guide roller 41, the pinch roller 43, and the pull-out post 44 are arranged between the tape 31 and the cassette 32. It is in the state of being

Next, the tension pole 34 and the pull-out post 44 pull out the tape 31 to the outside, the feed-side guide roller 36 and the feed-side inclined post 38 on the tape feeding side, and the winding-side inclination on the tape winding side. Post 4
0 and the winding-side guide roller 41 move in the pull-out direction to wind the tape 31 around the rotary drum 39. At this time, the supply-side inclined post 38 and the winding-side inclined post 40 are inclined along with the inclination of the rotary drum 39 so that the tape 31 can be guided parallel to the rotation surface of the rotary drum 39. . Further, as shown in FIG. 5, the tape 31 wound around the rotary drum 39 is restricted from traveling by the helical lead 46.

In the rotary drum device of this helical scan type magnetic recording / reproducing apparatus, the rotary drum 39 is used.
5, the tape 31 not wound around the rotating drum 39, that is, the tape 31 on the supply side and the tape 31 on the winding side are parallel to the chassis 47, as shown in FIG. However, when looking at the tape center line 31a, the tape 31 in the portion wound around the rotary drum 39 is on the supply side on the rotary drum 39, the rotary drum 3
9 is lower than the tape 31 of the portion not wound around, and on the take-up side is higher than the tape 31 not wound around the rotating drum 39, which is in an inclined state. . Further, the tape 31 wound around the rotating drum 39 while being inclined is returned to the original inclined state during unloading, moved so as to be parallel to the chassis 47, and wound around the cassette 32.

[0011]

However, at the time of unloading, when the tape 31 is removed from the helical lead 46, the tape 31 is accommodated in the cassette 32 and parallel to the chassis 47. The supply side is below the tape 31, and the winding side is above the tape 31. Therefore, when the tape 31 separates from the rotating drum 39, the lower edge 31b of the tape 31 on the winding side of the helical lead 46.
Has a problem that the lower edge 31b of the tape 31 is easily damaged, as shown by Y'in FIG.

The present invention has been made in view of the above problems, and an object thereof is to provide a rotary drum device of a magnetic recording / reproducing apparatus in which the tape is not damaged during unloading.

[0013]

A rotary drum device of a magnetic recording / reproducing apparatus according to the present invention has two loading posts from both sides of a rotary drum having a drum in which a tape guide groove for restricting tape running is formed. A parallel loading mechanism for pulling out the tape and winding the tape around the rotating drum by providing a recess at the lower edge of the tape guide groove on the tape winding side to widen the groove width, and at the same time, providing a tape guide groove for the drum. It is characterized in that at least three points corresponding to the tape running entrance, the center, and the exit at the edge of are formed on substantially the same straight line.

[0014]

With the above-described structure, in the rotating drum whose tape supply side is located below the tape winding side, at the moment when the tape separates from the tape guiding groove during unloading, conventionally, the tape guiding groove is located above the tape on the tape winding side. Although it is on the upper side, by providing a recess at the lower edge of the tape guide groove on the tape winding side, the tape and the tape guide groove are widened on the tape winding side during unloading, that is, the tape guide Since the groove is located below the tape, the tape can be removed without being caught in the tape guide groove at the moment the tape is released, and the damage to the tape can be reduced. Further, since at least three points, which are the tape running entrance, the center, and the exit, at the edge of the tape guide groove of the rotary drum are formed so as to be substantially on the same straight line, the tape running stability can be ensured and the recessed portion can be formed. The influence of tape running due to can be eliminated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS.

The rotary drum device of the magnetic recording / reproducing apparatus according to this embodiment is provided in a magnetic recording / reproducing apparatus such as a home VTR (Video Tape Recorder) which adopts a helical scan system, as shown in FIG. Has a rotary drum 9 inclined in the direction of arrow X, and a tension pole 4, a supply side fixed guide 5, a supply side guide roller 6, a supply side impedance roller 7 and a supply side inclination are provided on the tape supply side of the rotation drum 9. While the post 8 is provided, the take-up side inclined post 10, the take-up side guide roller 11, the capstan shaft 12, the pinch roller 13 and the pull-out post 14 are provided on the take-up side of the rotary drum 9, and the cassette 2 is provided.
Magnetic tape stored in the (hereinafter referred to simply as "tape")
1 is pulled out to record / reproduce.

The rotary drum 9 is, as shown in FIG.
It is inclined in the arrow X direction so that the tape supply side is on the bottom and the tape winding side is on the top. The rotating drum 9 is composed of a rotating upper drum 9a and a fixed lower drum 9b. The lower drum 9b has a guide groove (hereinafter referred to as a helical groove) for restricting the running of the tape 1. The lead 16 is formed so as to have an inclination smaller than that of the rotary drum 9. Further, in the helical scan method, usually, two magnetic heads (not shown) are arranged at 180 ° intervals in the upper drum 9a.

As shown in FIG. 1, the helical lead 16 corresponds to the tape 1 mounted on the rotary drum 9 at the tape inlet, center, and outlet A of the rotary drum 9.
It is formed so as to be regulated at points B, C, and C, and a concave portion 16a is provided between the points B and C with respect to the tape winding side of the helical lead 16 and the tape sliding surface of the rotary drum 9. It is formed so that the width of the helical lead 16 is expanded downward in the right angle direction. However, the recess 16a does not hinder the running of the tape 1 on the helical lead 16, and
It is formed in a size that does not cause tape distortion. At the points A, B, and C, the respective points of the edge of the helical lead 16 are arranged substantially on the same straight line so that the tape 1 mounted on the rotary drum 9 can be recorded and reproduced at appropriate positions. It is provided in.

The cassette 2 includes a supply reel 3 for supplying the tape 1 and a take-up reel 15 for winding the tape 1.
The tape 1 is usually housed in the cassette 2 by the supply reel 3 and the take-up reel 15, and is covered by a cassette lid (not shown). When the cassette 2 is inserted into the apparatus, the cassette lid is opened and the tape 1 is exposed.

The tension pole 4 and the pull-out post 14 are adapted to move so that the tape 1 exposed when the cassette lid is opened is pulled out to the outside when the cassette 2 is inserted. At this time, tension pole 4
Presses the tape 1 against the supply-side fixed guide 5 and applies a constant tension so that the tape 1 can be stably supplied. On the other hand, the tape 1 pulled out by the pull-out post 14 is A constant tension is applied by 12 and the pinch roller 13.

The supply guide roller 6 and the supply side inclined post 8 are provided on the same pole base so that they can be moved in the tape 1 drawing direction and the tape 1 can be wound around the supply side of the rotary drum 9. . The winding-side inclined post 10 and the winding-side guide roller 11 are also provided on the same pole base, move in the tape 1 drawing direction, and wind the tape 1 around the winding side of the rotary drum 9. ing.

The supply side inclined post 8 and the take-up side inclined post 10 are provided so as to be inclined with the inclination of the rotary drum 9, so that the tape 1 can be stabilized along the surface of the rotary drum 9. It is tilted so that it can run.

Here, regarding the loading mechanism of the tape 1 in the rotary drum device of the magnetic recording / reproducing apparatus,
This will be described below with reference to FIGS. 1 to 3.

First, when the cassette 2 is inserted into the apparatus, the cassette lid (not shown) is opened and the tape 1 is exposed. At this time, between the tape 1 and the cassette 2,
A tension pole 4, a supply-side guide roller 6, a supply-side inclined post 8, a winding-side inclined post 10, a winding-side guide roller 11, a pinch roller 13 and a pull-out post 14 are arranged.

Next, the tension pole 4 and the pull-out post 14 pull out the tape 1 in a parallel and outward direction from the housed state of the cassette 2, and at the tape feed side, the feed-side guide roller 6 and the feed-side inclined post 8 are pulled out. On the tape winding side, the winding side inclined post 10 and the winding side guide roller 11 move in the pull-out direction to wind the tape 1 around the rotary drum 9.

At this time, as shown in FIGS. 1 and 3, the tape 1 has the same height on the tape supply side and the tape winding side in a state where it is not wound around the rotary drum 9,
Further, although it is parallel to the chassis 17, when it is wound around the rotary drum 9, it is inclined by the supply-side inclined post 8 and the winding-side inclined post 10 in accordance with the inclination of the rotary drum 9, and the helical lead 16 is rotated. It winds along.

Further, the tension pole 4 moves so as to press the supply side fixed guide 5, and the pinch roller 13 moves so as to press the capstan shaft 12, whereby tension is applied to the tape 1.

The tape 1 pulled out from the cassette 2 as described above, as shown in FIGS.
As described above, the tape 1 is wound in parallel with the chassis 17 before it is wound around the rotary drum 9. The inclination is given along the helical lead 16 formed on the drum 9b. For this reason,
The center line 1a of the tape 1 is parallel to the supply side and the take-up side of the rotating drum 9 except for the winding portion.
The portion wound around the tape is on the lower side on the tape supply side and is on the upper side on the tape winding side, as compared with the center line 1a of the tape 1 other than the winding portion of the rotary drum 9. Further, when the tape 1 is detached from the rotary drum 9,
At the same level as the height of the tape 1 on both sides of the tape 1, the tape 1 returns to the straight state. At this time, on the tape supply side of the helical lead 16, the tape 1 is located above the helical lead 16, and on the tape winding side of the helical lead 16, the recess 16a is provided, so that the tape 1 is located below the helical lead 16. It has become.

Therefore, when the tape 1 is unloaded, that is, when the tape 1 is detached from the rotary drum 9, the lower edge 1b of the tape 1 is conventionally the tape winding side of the helical lead 16, that is, the points B and C. Although the tape 1 was caught between the tape 1 and the tape 1 was wavy at that portion and damaged the tape 1 itself, in the present invention, as shown in FIG. 1, the helical lead 16 provided on the lower drum 9b of the rotary drum 9 is used. Since the concave portion 16a is provided between the points B and C so as to widen the width of the helical lead 16, when the tape 1 is separated from the rotating drum 9 during unloading, the lower edge 1b of the tape 1 is prevented from being caught. The tape 1 can be removed from the rotating drum 9 without damaging the tape 1.

The helical lead 16 has a recess 1
6a is provided, the helical lead 16
Is at least points A and B, which are points for restricting running of the tape 1.
Since the points and the points C are provided so as to be substantially on the same straight line, the running stability of the tape 1 can be ensured without affecting the tape running due to the formation of the recess 16a.

Therefore, the damage of the tape 1 at the time of unloading is reduced and the helical lead 1 of the tape 1 is reduced.
The linearity of the tape pattern in 6 can be maintained.

[0032]

As described above, the rotary drum device of the magnetic recording / reproducing apparatus of the present invention has two loadings from both sides of the rotary drum having the drum having the tape guide groove for restricting the tape running. In a rotary drum device of a magnetic recording / reproducing apparatus equipped with a parallel loading mechanism for pulling out a tape by a post and winding the tape around the rotary drum, a recess is provided at the tape winding side lower edge of the tape guide groove so as to widen the groove width. The tape guide groove of the drum is formed so that at least three points corresponding to the tape running entrance, the center, and the exit are on substantially the same straight line.

Therefore, it is possible to reduce the damage to the tape during unloading and to maintain the linearity of the tape pattern in the guide groove of the tape.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a tape mounting state on a rotary drum in an embodiment of the present invention.

FIG. 2 is a plan view showing a rotary drum device of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 3 is a view taken along the line ZZ in FIG.

FIG. 4 is a plan view showing a rotary drum device of a conventional magnetic recording / reproducing apparatus.

FIG. 5 is a Z′-Z ′ arrow view in FIG. 4;

[Explanation of symbols]

 1 Tape 2 Cassette 3 Supply Reel 4 Tension Pole 6 Supply Side Guide Roller 8 Supply Side Tilt Post 9 Rotating Drum 9a Upper Drum 9b Lower Drum 10 Winding Side Tilt Post (Loading Post) 11 Winding Side Guide Roller (Loading Post) 14 Drawer roller 15 Take-up reel 16 Helical lead 16a Recess

Claims (1)

[Claims] 1. A rotary drum having a drum in which a tape guide groove for restricting the running of the tape is formed.
In a rotary drum device of a magnetic recording / reproducing apparatus equipped with a parallel loading mechanism for pulling out a tape by a loading post of a book and winding the tape around the rotary drum, a concave portion is formed so as to widen the groove width at the lower edge of the tape guide groove on the tape winding side. Is provided, and at least three points of the tape guide groove of the drum, which are the tape running entrance, the center, and the exit, are formed so as to be substantially on the same straight line. .