JPH0664801B2 - Tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The tape recorder of the present invention will be described in accordance with the following items.

A. Industrial field B. Outline of invention C. Background art D. Problems to be solved by the invention [Fig. 7] E. Means for solving the problems F. Examples a. Tape cassette [ 1 to 6] b. Video tape recorder [Figs. 1 to 5] b-1. Reel stand [Figs. 1 to 5] b-2. Cassette positioning pin [Figs. 1 to 5] Fig. 5] b-3. Head drum [Figs. 1 to 5] b-4. Tape loading post [Figs. 1 to 5] b-4-a. Inlet loading post [Figs. 1 and 5] Three
[Fig.] B-4-b. Exit side loading post [Fig. 1, 2
Figure, Figure 4, Figure 5] b-4-c. Movement b-5. Other members [Figure 1] c. Mounting of tape cassette d. Tape path when not loaded e. Tape loading [first Figures to 4] e-1. Initial state [Figures 1 to 3] e-2. Loading [Figures 1 to 4] e-2-a. Movement of moving member e-2-b . Tape running f. Tape unloading [Fig. 5] G. Effect of the invention (A. Industrial field of use) The present invention relates to a novel tape recorder. For more information,
For example, video tape recorders and so-called PCM (pulse
It has a head drum equipped with a rotary magnetic head and a tape loading post, such as an audio tape recorder using a recording method, and recording or playback from the non-loading position of the tape loading post to the loading completion position close to the head drum. The present invention relates to a tape recorder in which a magnetic tape is pulled out from a tape reel by moving the magnetic tape and a part of the magnetic tape is wound around a head drum at a predetermined winding angle. It is an object of the present invention to provide a new tape recorder that can be performed without being in close contact with the drum.

(B. Summary of the Invention) The present invention has a head drum provided with a rotary magnetic head and a tape loading post, and for recording or reproduction, the tape loading post is moved from a non-loading position to a loading completion position close to the head drum. By pulling the magnetic tape out of the tape reel by doing so, and in a tape recorder where a part of the magnetic tape is wound around the head drum at a predetermined wrapping angle, the tape is moved to the non-loading position of the tape loading post when unloading the tape. By displacing the timing between the movement of the tape and the winding operation of the tape by the tape reel, the unloading of the tape can be performed at least in a state where the magnetic tape is not in close contact with the head drum.

(C. Background Art) For example, recording on a magnetic tape in a tape recorder such as a video tape recorder (hereinafter referred to as "VTR") or an audio tape recorder using a so-called PCM (pulse code montage) recording method is usually performed. This is done while forming tracks extending obliquely to the running direction on the magnetic tape.

Therefore, this type of tape recorder is generally provided with a head drum equipped with a rotary magnetic head,
When recording or reproducing, the magnetic tape is pulled out from the tape reel of the mounted tape cassette, and a part of the magnetic tape is wound around the outer peripheral surface of the head drum in a predetermined spiral winding shape.

Therefore, a step is formed at least in the axial direction of the head drum between the winding start position and the winding end position of the tape on the head drum, and this step changes the axial direction of the head drum in the height direction of the tape recorder. The tape recorder becomes larger in the height direction of the tape recorder as it rises up, and conversely becomes smaller in the height direction of the tape recorder as the inclination of the head drum in the axial direction becomes larger.

Further, a tape guiding engagement step called a lead is formed on the outer peripheral surface of the head drum, and one side edge in the width direction of the portion of the magnetic tape wound around the head drum is formed as described above. It is designed to be guided in the traveling direction by being lightly pressed against the reed.

There are various types of tape loading mechanisms, that is, a mechanism for winding a magnetic tape around a head drum, etc., but in any case, basically, by moving the tape loading post. I am supposed to do it. That is, when the tape cassette is loaded, it is equipped with a plurality of tape loading posts that are located on the side opposite to the head drum, sandwiching the magnetic tape, and move the tape loading posts to a position close to the head drum. By doing so, the magnetic tape is pulled out from the tape cassette and wound around the head drum or the like.

(D. Problems to be solved by the invention) [Fig. 7] By the way, in order to miniaturize a VTR or the like, the diameter of the head drum is made as small as possible, or the distance between the head drum and the tape reel is shortened as much as possible. You could think so.

When the diameter of the head drum is reduced, it is necessary to increase the tape wrap angle for that amount.

In this case, if the inclination of the head drum is kept as small as possible, the step difference between the tape winding start position and the tape winding end position on the head drum increases in the height direction of the tape recorder. The height of the magnetic tape drawn out from the tape greatly changes between the position on the tape drawing surface of the tape cassette and the tape winding start position and / or the tape winding end position of the head drum.

Therefore, it is necessary to increase the inclination of the inclined guide post provided in the traveling path of the tape, and the magnetic tape travels while being greatly twisted in the portion wound around the inclined guide post having such a large inclination. As a result, there will be problems such as excessive stress being applied to the magnetic tape, and further, since the tape loading post must be moved while being displaced in the height direction of the tape recorder, The problem arises that the mechanism becomes extremely complicated.

When there is a difference in height between the magnetic tape pull-out surface of the tape cassette and the tape winding start position and / or the tape winding end position of the head drum, the separation distance between the head drum and the tape reel is normally set. When the tape is shrunk, the height of the tape must be changed by a short distance, which increases stress on the tape during tape loading.

Therefore, in order to prevent the height of the magnetic tape pulled out from the tape cassette from changing as much as possible, as shown in FIG. 7, the tape loading system is set to a tape winding start position and a tape winding end position. It is conceivable to adopt a tape loading method in which a step between them does not occur in the height direction of the tape recorder. In the figure, a is a mechanical chassis, b is a tape reel on the supply side, and c is
Is a tape reel on the winding side, d is a magnetic tape, e is a head drum, and f ₁ and f ₂ are tape loading posts.

By doing so, the tape loading posts f ₁ , f
_{Since 2} is moved substantially horizontally, the mechanism for moving this can be made relatively simple, and the magnetic tape b drawn from the tape reels b and c is wound on the head drum e. Since the height of the portion other than the attached portion is not changed, the vehicle can be driven without difficulty.

However, according to such a system, as can be seen clearly from FIG. 7, the inclination of the head drum e becomes extremely large, so that the height of the head drum e with respect to the tape recorder is increased, and in the end, The problem arises that the height of the tape recorder increases.

Further, as described above, the head drum is formed with the leads, and the tape loading is performed so that one of the two side edges of the magnetic tape located on the lower side is placed on the lead. . Except when the step occurs at a position lower than the tape pull-out surface, the lead is wholly or partially higher than one side edge of the magnetic tape at the tape pull-out surface position. When wrapped, it may occur that the tape surface is wrapped around the leads. Therefore, when the head drum rotates and the magnetic tape travels in such a state, the rotating magnetic head cannot contact the tape surface with a correct positional relationship relative to the tape surface, and the tape surface does not lead. It causes serious problems such as being damaged by the edge.

Further, unloading of the tape is performed by returning the tape loading post to the non-loading position from the state where the magnetic tape is on the lead and rotating the tape reel in the tape winding direction. The magnetic tape wound around the tape reel will be displaced downwards with one side edge of the magnetic tape being partially or wholly mounted on the lead, so it may break in the width direction. Or, it may happen that something is stuffy.

Such damage to the magnetic tape is more likely to occur as the step is larger, and as the distance between the tape pulling surface and the head drum is shorter.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the tape recorder of the present invention is designed such that the unloading of the magnetic tape is performed by removing the tape reel from a state where the tape loading post is at least separated from the magnetic tape. This is done by rotating in the tape winding direction.

Therefore, according to the present invention, the magnetic tape is wound around the tape reel at least in a state where the magnetic tape is not in close contact with the head drum.

(F. Examples) The details of the tape recorder of the present invention will be described below with reference to the examples shown in the accompanying drawings.

The embodiment shown in the drawings is an application of the present invention to a VTR. Before describing the VTR, an example of a tape cassette used for this will be described.

(A. Tape cassette) [FIGS. 1 to 6] 1 is a tape cassette.

Reference numeral 2 denotes a cassette case of the tape cassette 1. The cassette case 2 is made of synthetic resin and has a substantially symmetrical shape. It is shaped like a thin box.

Reference numeral 5 excludes left and right ends of the front surface of the cassette case 2 (when the tape cassette 1 is oriented, the upward direction in FIG. 1 is the front side and the downward direction in the figure is the rear side). These are tape-drawing recesses formed by bending a portion into a substantially inverted trapezoidal shape when viewed from above, and are both left and right ends of the front surface of the tape case 2,
Tape outlets 6,7 on both the left and right sides of the tape pull-out recess 5
Are formed.

Reference numerals 8 and 9 denote tape reels, the left one 8 of these two tape reels 8 and 9 is a so-called supply-side tape reel (hereinafter referred to as “S reel”), and the right tape reel 9 is so-called winding. It is a take-up tape reel (hereinafter referred to as "T reel").

The tape reels 8 and 9 are provided with reel hubs 10 and 10 'located at the respective central portions thereof, and two flanges 11, 11 and 11 fixed to the reel hubs 10 and 10' at positions near the upper ends and the lower ends thereof. ′, 11 ′, reel hub 10 and
In the 10 ', engaging holes 12 and 12' opened downward (first
(See the figure) is formed.

The tape reels 8 and 9 are the reel hubs 10 and 1
The lower end of 0'is located in the circular holes 14 and 14 (only one of which is shown in the drawing) formed in the bottom plate 13 of the cassette case 2 and the upper end surface of the reel hub 10 and 10 '. Reel pressing springs 17 and 17 attached to the top plate 16 of the cassette case 2 on the formed protrusions 15 and 15 (only those provided on the T reel 9 are shown in the drawing) (also in this figure) , Only the side of the T reel 9 is shown.) The tip end portion of the T reel 9 is housed in the cassette case 2 while being elastically contacted from above.

Reference numeral 18 denotes a front lid that is formed in a substantially U-shape when viewed from above, and the front lid 18 has its U-shaped end portions 18a, 18a rotatably attached to the front end portions of the left and right side surfaces of the cassette case 2. By being supported, the U-shaped intermediate portion 18b closes the front of the cassette case 2, that is, the position shown in FIG. 6 (hereinafter, this position is referred to as "closed position") and the cassette case 2. It is provided so as to be moved between a position where the front surface is opened, that is, a position shown in FIGS. 2 to 5 (hereinafter, this position is referred to as an “open position”). It should be noted that the front cover 18 is constantly biased by a not-illustrated elastic means so as to move toward the closed position. Further, the front end portion 16a of the top plate 16 of the cassette case 2 is located so as to face the rear end portion of the tape pull-out recess 5, and when the front lid 18 is in the closed position, the intermediate portion 18b The upper portion is positioned so as to overlap the front end portion 16a from above.

Reference numerals 19 and 19 'denote tape withdrawing recesses 5 of the tape outlets 6 and 7.
It is a tape guide in a cassette having a substantially semi-cylindrical shape formed on the side surface on the side.

20 is a magnetic tape. The magnetic tape 20 has 2 at both ends.
Each tape reel 8 and 9 is individually fixed to the reel hubs 10 and 10 'and wound by a predetermined amount. In a state before the tape cassette 1 is mounted on the VTR, a thin two-dot chain line is shown in FIG. Passed through the path shown. That is, in this state, the magnetic tape 20 is drawn out from the S reel 8 and then led out of the cassette case 2 from the tape outlet 6 on the left side, passed through the front surface of the tape pull-out concave portion 5 and fed from the tape outlet 7 on the right side to the cassette. It is introduced into the case 2 and wound on the T reel 9.

(B. Video tape recorder) [Figs. 1 to 5] 21 is a VTR and 22 is its mechanical chassis.

(B-1. Reel stand) [FIGS. 1 to 5] 23 and 24 are reel stands, and the left one 23 of these two reel stands 23 and 24 is stored in the cassette case 2 of the tape cassette 1. The reel table 24 on the right side is a reel table (hereinafter, referred to as “S-side reel table”) with which the S reel 8 is engaged, and the reel table 24 with which the T reel 9 is engaged (hereinafter, referred to as “reel table”).
It is called "T side reel stand". ).

The reel stands 23 and 24 are the front edge of the mechanical shank 22 (hereinafter referred to as VT
When indicating the direction of R21, the downward direction in FIG. 1 is the front side, and the upward direction in the same figure is the rear side. ) It is rotatably supported by two reel base support shafts 25, 25 'which are erected from the left and right spaced apart positions.

The reel bases 23 and 24 have base shaft portions 26 and 26 'through which the reel base support shafts 25 and 25' are inserted, and the center portion of the base shaft portions 2 and 26 '.
Disc portions 27 and 27 ', which are integrally formed with the portions of 6 and 26' near the lower end and have gear teeth formed on the outer periphery thereof, and the disc portions.
Substantially cylindrical reel mounting portions 28, 28 'projecting upward from the upper surfaces of 27, 27' and engagement shafts 29, 29 '(upper end portions of the base shaft portions 26, 26' ( (See FIG. 1), and one of them depending on a predetermined tape running mode is rotationally driven by a reel base driving means (not shown).

(B-2. Cassette Locating Pin) [FIGS. 1 to 5] Reference numerals 30, 30 and 31, 31 are cassette locating pins erected from a predetermined position of the mechanical chassis 22. These cassette positioning pins 30, 30 and 31, 31 are the tape cassette 1
When the cassette case 2 is mounted on the VTR21, the cassette case 2 is placed on these so that the cassette case 2
The VTR21 is used for positioning in the height direction and the horizontal direction. Of these, the rear one 31,
A not-shown substantially conical insertion portion is formed on the upper end surface of 31.

(B-3. Head Drum) [FIGS. 1 to 5] 32 is a head drum, and the head drum 32 is arranged at the rear center of the mechanical chassis 22 in a substantially central portion in the left-right direction. The head drum 32 is composed of a lower drum 34 fixed to a drum support 33 provided on the mechanical chassis 22 and an upper drum 35 fixed to a rotation shaft (not shown) rotatably supported by the lower drum 34. It is provided in a posture in which its axial direction is inclined to a substantially left side by a predetermined inclination angle.

In addition, there is a slight gap between the lower end surface of the outer peripheral portion of the upper drum 35 and the upper end surface of the outer peripheral portion of the lower drum 34, and a plurality of video heads (not shown) are positioned in the above-mentioned gap and It is provided so as to rotate integrally with 35. The gap surface of the video head is located on the outer peripheral surface of the head drum 32.

36 is a lead formed on the outer peripheral surface of the lower drum 34.
The lead 36 is formed on the outer peripheral surface over a range of a central angle of about 300 °, and one end portion (hereinafter, referred to as an “entrance”) located at a portion of the outer peripheral surface that is closer to the left side from the rear end portion of the outer peripheral surface. It is formed so as to extend in a substantially spiral shape in the counterclockwise direction in FIG.

The upper drum 35 and the video head are rotated by rotating a rotating shaft (not shown) to which the upper drum is fixed by a drum motor.

(B-4. Tape loading post) [Figs. 1 to 5
[Fig.] 37, 38 and 39 are tape loading posts. These tape loading posts 37, 38, and 39 are shown by solid lines in FIG. 1 in the state before tape loading is performed, and are in the positions shown in FIGS. 2 and 3 (hereinafter referred to as “non-loading positions”). ), And when tape loading is performed, it is indicated by a chain double-dashed line in FIG.
The magnetic tape 20 is moved to the position shown in FIG. 4 (hereinafter referred to as “loading completion position”), and thereby the magnetic tape 20 is pulled out from the tape cassette 1 mounted on the VTR 21 and passes through a predetermined path in the VTR 21. It is for

And these three tape loading posts 37 and
The leftmost one of 38 and 39 is the magnetic tape 20.
Of the tape loading post (hereinafter, referred to as a part of the head drum 32 to a position close to the tape winding start position.
If necessary, this tape loading post 37 will be referred to as an "entrance side loading post". ), And the other two tape loading posts 38, 39 guide another part of the magnetic tape 20 to a position close to the tape winding end position on the head drum 32 (hereinafter,
If required, use these two tape loading posts 3
8 and 39 are called "exit side loading posts". ). Further, if necessary, one of the two outlet side loading posts 38 and 39 located on the right side in a state where it is in the position shown by the solid line in FIG. 1 is referred to as an “outlet side first loading post”. , The one on the left 39 "Exit side second
Loading post. "

(B-4-a. Inlet-side loading post) [FIGS. 1 and 3] The inlet-side loading post 37 is rotatably supported by a support shaft 41 provided upright from a moving block 40 (see FIG. 3). Is formed between the two flanges 42, 42 provided on the support shaft 41 so as to be axially separated from each other, and the axial direction thereof is substantially perpendicular to the mechanical chassis 22. It has a posture that extends along it.

(B-4-b. Exit side loading post) [Figs. 1, 2, 4, 5] The exit side loading posts 38 and 39 are both supported by one moving block 43. .

The first loading post 38 on the outlet side has an upper portion 38a which occupies substantially the upper half in the axial direction thereof and has a larger diameter than the lower portion 38b thereof, and is rotatably supported by a support shaft 44 provided upright from the moving block 43. It has a supported roller structure. The lower end of the outlet-side first loading post 38 is located on the flange 45 fixed to the support shaft 44.

In addition, the first outlet post 38 on the outlet side is provided so as to be inclined such that the axial direction of the first outlet post 38 at the loading completion position is inclined to the left and obliquely rearward.

In addition, the lower end of the second loading post 39 on the outlet side is embedded in the moving block 43, and
It is provided so as to be positioned so as to be inclined to the substantially right side on the substantially right side of the outlet-side first loading post 38 when it reaches the loading completion position.

In addition, the upper part 38a of the inlet side loading post 37 and the outlet side first loading post 38 is positioned at substantially the same height as the upper drum 35 of the head drum 32, and the outlet side second
Loading post 39 has substantially the same length as the outlet-side first loading post 38.

(B-4-c. Moving) The moving blocks 40 and 43 are supported by moving means of a tape loading mechanism (not shown), and are moved by moving the moving means, whereby the tape loading posts 37 and 38 and 39 are moved substantially horizontally between the non-loading position and the loading completion position.

(B-5. Other members) [FIG. 1] 46 is a capstan disposed at a substantially intermediate position between the head drum 32 of the mechanical chassis 22 and the right end edge, and the capstan 46 records or It is rotated at a constant speed when reproduction is performed.

47 and 48 are tape guide posts provided on the left side of the head drum 32 of the mechanical chassis 22 and at a position substantially obliquely rearward rearward from the position, and 49 is a tape placed on the left side of the capstan 46. The tape guide post 49 is a guide post, and is provided in a posture inclined toward the right side.

Further, 50 is a pinch roller, 51 is a flip guide, and 52 is a tenon pin. , "Non-loading position"), and when the tape is loaded, the tape is moved to a position indicated by a chain double-dashed line in FIG. 1 (hereinafter referred to as "loading completion position"). Has become.

(C. Mounting of tape cassette) The tape cassette 1 is mounted in a predetermined cassette mounting position of the VTR 21 as follows, for example.

That is, when the tape cassette 1 is inserted into the outer casing (not shown) of the VTR 21 from the cassette insertion opening formed on the front surface thereof, the tape cassette 1 is mounted on the cassette holding member of the cassette loading mechanism (not shown). The lower portion of the magnetic tape 20 of the tape cassette 1 mounted on the cassette holding member faces the upper portion of the upper drum 35 in the initial position where the tape cassette 1 is mounted on the cassette holding member. Is coming to height The front lid 18 of the tape cassette 1 is moved to the open position by the lid raising member provided on the cassette holding member when the tape cassette 1 is mounted on the cassette holding member, and the tape cassette 1 is moved to the cassette holding member. The state is maintained until it is taken out from the.

Then, when the tape cassette 1 is inserted into the cassette holding member to a predetermined insertion position, the cassette holding member is first moved rearward substantially horizontally while holding the cassette case 2. This movement is performed until the front end 16a of the top plate 16 of the cassette case 2 is located above the front end of the upper end surface of the head drum 32.

Therefore, in this state, the lower portion of the portion of the magnetic tape 20 that is led out of the cassette case 2 is pressed against the upper portion of the front end of the outer peripheral surface of the upper drum of the head drum 32.

This movement of the cassette holding member downward from this state is performed until the cassette case 2 is placed on the cassette positioning pins 30, 30, 31 and 31.

Then, the cassette case 2 has the cassette positioning pin 3
When placed on 0, 30 and 31, 31, the positioning of the cassette case 2 in the height direction with respect to the mechanical chassis 22 is performed, and at the same time, it is provided on the upper end surface of the rear cassette positioning pins 31, 31. The inserted portion (not shown) is inserted into a positioning hole (not shown) formed in the bottom surface of the cassette case 2, and thereby the positioning in the horizontal direction is performed.

The tape reels 8 and 9 housed in the cassette case 2 have the cassette positioning pins 30,
Shortly before being placed on 30 and 31, 31 its reel hub 10, 10 'has its reel rest 28, 28' on the reel stand 23, 24.
Placed on top. Therefore, when the cassette case 2 is placed on the cassette positioning pins 30, 30 and 31, 31, the tape reels 8 and 9 are attached to the bottom plate 13 of the cassette case 2.
It is located slightly elevated from above, and this time it is pressed against the reel stands 23, 24 by the reel pressing springs 17, 17.

Along with this, the engaging holes 12, 1 of the tape reels 8, 9
Engaging shafts 29 and 29 'of reel stands 23 and 24 are relatively inserted in 2', whereby the S reel 8 is rotated integrally with the S side reel stand 23, and the T reel 9 is the T side reel stand. It becomes a state of being rotated integrally with 24.

Then, the tape cassette 1 is mounted in the predetermined cassette mounting position in the VTR 21.

(D. Tape path at the time of non-loading) On the other hand, the portion of the magnetic tape 20 which is led out of the cassette case 2 is moved downward while the substantially central portion thereof wanders around the outer peripheral surface of the upper drum 35, and the tape reel 8, 9 is a reel stand
When engaged with 23 and 24, the path shown by the solid line in FIG. 1 is passed. That is, in this state, the magnetic tape 20
Of the cassette case 2 of which the substantially central portion is wound around the front end portion of the outer peripheral surface of the upper drum 35 in a substantially inverted shape (hereinafter, this path will be referred to as "tape when not loaded"). "Pass".) Will be passed.

In this state, the portion of the magnetic tape 20 that is led out of the cassette case 2 is the lead formed on the lower drum 34, as can be seen clearly in FIGS. 2 and 3.
Positioned without any contact with 36 and lead 36
Of the lead 36, that is, at a height above the highest part of the lead 36.

(E. Tape loading) [Figs. 1 to 4] (e-1. Initial state) [Figs. 1 to 3] When the tape cassette 1 is mounted on the VTR 21 as described above, the tape Loading posts 37 and 38, 39,
Pinch roller 50, Flider guide 51, Tenregi pin 52
Are relatively positioned in the tape pull-out concave portion 5 of the cassette case 2. Therefore, these moving members are located on the front side of the portion of the magnetic tape 20 that is led out of the cassette case 2, that is, on the side opposite to the head drum 32, and substantially all or at least a part thereof in the height direction. It will be located at the same height as the magnetic tape 20.

Especially, the inlet side loading post 37 has its flanges 42, 42.
Is located at a height that substantially opposes both end edges of the magnetic tape 20 in the width direction, and the outlet side first loading post
An upper portion 38a of the 38, that is, a portion having a large diameter is opposed to the magnetic tape 20.
The upper half of 39 also faces the magnetic tape 20.

(E-2. Loading) [FIGS. 1 to 4] (e-2-a. Movement of moving member) Then, when a command for tape loading is issued from this state, the tape loading posts 37 and 38 are provided. , 39
Is moved toward the loading completion position, and the pinch roller 50, the flip guide 51, and the balance pin 52 are also moved toward the loading completion position.

As described above, the tape loading posts 37 and 3
Both 8 and 39 are moved substantially horizontally, and the pinch roller 50, the flip guide 51, and the balance pin 52 are also moved substantially horizontally.

As a result, the magnetic tape 20 is pulled out from the cassette case 2, and a part of the pulled out portion is the head drum 32.
It is wrapped around the outer peripheral surface of the machine at a wrap angle of about 300 °, and the other part is capstan 46 and pinch roller 50.
And will pass through the path shown by the thick two-dot chain line in FIG.

When the magnetic tape 20 is wound around the head drum 32, since the tape loading posts 37, 38, and 39 are all moved horizontally, the magnetic tape 20 maintains the height of the path when it is not loaded. Will be done.

Therefore, at the time when the movement of the tape loading posts 37 and 38, 39, etc. to the loading completion position is completed, at least the portion of the magnetic tape 20 wound around the head drum 32 is positioned at substantially the same height. Therefore, on the outer peripheral surface of the head drum 32, a position where the magnetic tape 20 is wound around the head drum 32 after the magnetic tape 20 leaves the inlet side loading post 37 (hereinafter referred to as a “winding start position”). ) And the position where the winding of the magnetic tape 20 ends (hereinafter referred to as the “winding end position”), no step is formed.

Further, since the magnetic tape 20 is wound around the head drum 32 in this manner, at the winding start position, the lead 36 approaches or lightly rides on the lead 36 from above. Also, at least the portion 36 does not cover the lead 36.

(E-2-b. Running of tape) Then, when the movement of the tape loading posts 37 and 38, 39, etc. to the loading completion position is completed,
While the capstan 46 is rotated, the T-side reel stand 24 is rotated and the T-reel 9 is rotated in the tape winding direction.

As a result, the magnetic tape 20 is run.

Then, a predetermined tension is generated in the magnetic tape 20 and the magnetic field is generated by the outlet-side first loading post 38 being inclined toward the substantially left side in the portion wound around the outlet-side first loading post 38. Since a moving force is applied to the tape 20 in a diagonally rightward and downward direction, this portion gradually moves downward over the upper portion 38a thereof, and finally, as shown in FIG. 4 (B). , Will be wrapped around the lower part 38b. The state of being wound around the lower portion 38b is held by the flange 45 blocking the downward movement of the portion wound around the lower portion 38b.

In this state, the winding end position of the head drum 32 moves downward, so that the magnetic tape 20 is wound around the head drum 32 along the lead 36 in a substantially spiral shape.

In this state, there is a step between the height of the portion of the magnetic tape 20 wound around the second loading post 39 on the outlet side and the height of the tape outlet 7 on the right side of the cassette case 2. The tape 20 is located at the position where it is wound around the second loading post 39 on the outlet side and on the left side of the capstan 46.
It will be raised to the height of the tape exit 7 between the position wound around 49.

Then, this state becomes the tape loading completion state, and recording or reproduction on the magnetic tape 20 is performed in this state.

(F. Tape unloading) [Fig. 5] Tape unloading is performed as follows.

That is, when a tape unloading command, that is, a command for ejecting, or a command for fast-forwarding or rewinding the tape is issued from the tape loading completed state, both of the tape reels 8 and 9 are First, the tape loading mechanism starts the unloading operation without being rotated in the tape winding direction. As a result, the tape loading posts 37 and 38, 39 are moved to the non-loading position, and the pinch roller 5
0, the slide guide 51 and the balance pin 52 are also moved to the non-loading position.

Then, since the tape loading posts 37, 38, and 39 move away from the magnetic tape 20, the portion of the magnetic tape 20 that has been wound around the head drum 32 moves away from the outer peripheral surface of the head drum 32, or at least floats so as not to adhere. Moreover, as shown in FIG. 5, the so-called rigidity of the magnetic tape 20 itself causes the tape reels 8 and 9 to move.
It will move upward in order to reach the same height as the part that is wrapped around. The upward moving force becomes stronger as the amount of the sheet pulled out of the cassette case 2, that is, the shorter the length.

Therefore, the rotation of the tape reel 8 or 9 in the tape winding direction is at least the tape loading posts 37 and 38, 39.
Starts away from the magnetic tape 20. Although the timing of starting the rotation of the tape reel 8 or 9 is not generally defined, for example, as shown in FIG. 5, the tape loading posts 37, 38 and 39 are in the non-loading position and the loading completion. Alternatively, the timing may be selected such that it reaches a position approximately halfway between the positions and the tape loading posts 37 and 38, 39.
It is also possible to start after returning to the non-loading position. In any case, the timing to start the rotation of the tape reel 8 or 9 in the tape winding direction should be defined in consideration of the weight and rigidity of the magnetic tape used, the tape winding angle with respect to the head drum 32, and the like. is there.

Then, when tape unloading is performed,
The part of the magnetic tape 20 that has been wound around the outer peripheral surface of the head drum 32 is separated from the outer peripheral surface, or at least is not in close contact with it, and the height of the part wound around the tape reels 8 and 9 is high. That is, the tape is wound around the tape reel 8 or 9 in a state where it returns to a height before the tape loading is started or a height close to this.

Therefore, the tape unloading is performed in a state where the magnetic tape 20 is located at a position higher than the lead 36 formed on the head drum 32, so that the tape surface does not contact the edge of the lead 36 or the like. .

(G. Effect of the Invention) As is clear from the above description, the tape recorder of the present invention is a head drum provided with a rotating magnetic head and a reel stand for rotating a tape reel on which a magnetic tape is wound. When the magnetic tape is being passed through the path in the non-loading state, it is positioned on the side opposite to the head drum across the magnetic tape, and when the tape is loaded, it is moved to the loading completion position close to the head drum. A tape loading post for drawing a magnetic tape from a tape reel and winding a part of the magnetic tape around the head drum at a predetermined wrapping angle; unloading of the magnetic tape is performed with the tape loading post at least separated from the magnetic tape; By rotating the tape in the tape winding direction. Characterized in that to carry out.

That is, according to the present invention, when the tape unloading is performed, the magnetic tape is wound around the tape reel at least in a state where the magnetic tape is not in close contact with the head drum. It does not break or stick due to the leads formed on it.

Also, when the tape loading post is released from the magnetic tape when the tape loading is completed, the part of the magnetic tape that had been wound around the head drum is displaced to the height of the tape pull-out surface due to the rigidity of itself. Therefore, by selecting the timing between the movement start of the tape loading post and the start of the tape winding operation by the tape reel during tape unloading, the magnetic tape that has been wound around the head drum until then is selected. It is also possible to wind the tape in a state in which the height of the tape is returned to the same height as the height of the pulling surface of the tape from the tape cassette or a height close to the height.

Therefore, according to the present invention, even if the step difference between the tape winding start position and the tape winding end position on the head drum becomes large, at least the winding of the magnetic tape at the time of tape unloading can be performed. It can be done without exerting any force.

In the embodiment described above, the winding of the magnetic tape around the head drum during tape loading is performed while the magnetic tape is held at the same height as the drawing surface from the tape cassette. By running the magnetic tape from the wound state for a certain period of time, the magnetic tape rides on the lead of the head drum and is wound in a substantially spiral shape with respect to this, but by doing so, Not only tape unloading but also tape loading can be performed in a state where the magnetic tape is not in contact with the leads of the head drum.

Further, in the above-described embodiment, the present invention provides a loading type tape in which the step between the tape winding start position and the tape winding end position on the head drum is lower than the drawing surface of the tape from the tape cassette. Although applied to a recorder, the present invention can also be applied to a tape recorder in which the above-mentioned step is at any height with respect to the pulling surface of the tape from the tape cassette.

[Brief description of drawings]

1 to 6 show an example of an embodiment in which the tape recorder of the present invention is applied to a video tape recorder. FIG. 1 is a plan view showing a state in which a tape cassette is mounted with a part cut away. FIG. 2 is a right side view showing a part of the main part with the tape cassette mounted, and FIG. 3 is a left side view showing the part of the main part with the tape cassette mounted, partly cut away. Is a schematic right side view showing the final operation in the tape loading step by step from (A) to (B), FIG. 5 is a schematic right side view showing the initial operation in the tape unloading, and FIG. 6 is the tape to be used. FIG. 7 is a perspective view showing an example of a cassette, and FIG. 7 is a view conceptually showing an example of a tape loading system. Explanation of symbols 8, 9 ... Tape reel, 20 ... Magnetic tape, 21 ... Tape recorder, 23, 24 ... Reel stand, 32 ... Head drum, 37, 38, 39 ... Tape loading post

Claims (1)

[Claims] 1. A head drum having a rotating magnetic head, a reel stand for rotating a tape reel on which a magnetic tape is wound, and a magnetic tape when the magnetic tape is passed through a path in an unloaded state. Is located on the side opposite to the head drum and is moved to a loading completion position close to the head drum when the tape is loaded, whereby the magnetic tape is pulled out from the tape reel and a part of the magnetic tape is placed on the head drum. And a tape loading post for wrapping at a wrapping angle, wherein the unloading of the magnetic tape is performed by rotating the tape reel in the tape winding direction with the tape loading post being at least separated from the magnetic tape. Tape recorder