JPS62184655A - Tape recorder - Google Patents

Abstract

PURPOSE:To prevent the tape face from being damaged by the lead edge by turning a tape reel in the tape winding direction so as to unload the magnetic tape from the state that a tape loading post is parted at least from the magnetic tape. CONSTITUTION:The turning of a tape reel 8 or 9 in the tape winding direction is started from the state that tape loading posts 37-39 are parts at least from the magnetic tape 20. The part of the magnetic tape 20 wound on the peripheral face of a head drum 32 so far is parted from the peripheral face and the tape 20 is wound on the tape reel 8 or 9 while the part is restored to the height wound on the tape reels 8, 9. Since the tape is loaded while the magnetic tape 20 comes to a position higher than the height of the lead 36 formed to the head drum 32, the tape face is not contacted to the edge of the lead 36.

Description

DETAILED DESCRIPTION OF THE INVENTION The tape recorder of the present invention will be explained according to the following items.

A. Industrial application field 30 Summary of the invention C9 Background art 8 Problems to be solved by the invention [Fig. 7] E1 Means for solving the problems F. Example a Tape cassette [Fig. 1 b. Video tape recorder [Fig. 1 to 5] b-1. Reel stand [Fig. 1 to 5] b-2. Cassette positioning bin [Fig. 'i1 to 5] b-3, Head drum [Figs. 1 to 5] b-4, Tape loading post [Figs. 1 to 5] b-4-a, Entrance side loading post [Figs. 1 to 3] b-4-b, Exit side loading post [Fig. 1, Fig. 2, Fig. 4, Fig. 5] b-4-c, Movement b-5, Other parts [Fig. 1] C, Tape cassette mounting d, tape path e when not loading, tape loading [Figs. 1 to 4] e-1, initial state [Figs. 1 to 3] e-2, loading [Figs. 1 to 4] [Figure] e-2-a, movement of moving member e-2-b, tape running f, tape unloading [Figure 5] G0 Effect of the invention (A, industrial application field) The present invention is a novel tape Regarding recorders. For more information,
For example, a video tape recorder or an audio tape recorder using the so-called PCM (Pulse Code Mondulation) recording method has a head drum equipped with a rotating magnetic head and a tape loading post.
For recording or playback, the magnetic tape is pulled out from the tape reel by moving the tape loading post from the non-loading position to the loading completion position close to the head drum, and a part of it is wrapped around the head drum at a predetermined angle. The present invention relates to a tape recorder which can be operated with the magnetic tape attached to the head drum, and the present invention is to provide a new tape recorder in which the tape can be unloaded while the magnetic tape is not in close contact with the head drum.

(B. Summary of the Invention) The present invention has a head drum equipped with a rotating magnetic head and a tape loading post, and during recording or reproduction, the tape loading post is moved from a non-loading position to a loading completion position close to the head drum. In a tape recorder, the magnetic tape is pulled out from the tape reel by being pulled out from the tape reel, and a part of the magnetic tape is wound around the head drum at a predetermined wrapping angle. By shifting the timing between the movement of the magnetic tape and the tape winding operation by the tape reel, the tape can be unloaded without the magnetic tape being at least 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 "VTRJ") or an audio tape recorder using the so-called PCM (Pulse Code Mondulation) recording method is usually performed using magnetic tape. This is done while forming tracks on the tape that extend obliquely to the running direction of the tape.

For this reason, this type of tape recorder is generally equipped with a head drum equipped with a rotating magnetic head.
When performing recording or reproduction, the magnetic tape is pulled out from the tape reel of the tape cassette installed, and a portion of the magnetic tape is wound approximately spirally around the outer peripheral surface of the head drum at a predetermined winding angle.

Therefore, there is a step at least in the axial direction of the head drum between the tape winding start position and the tape winding end position on the head drum. The tape recorder becomes larger in the height direction as it is raised along the direction, and conversely, as the inclination of the head drum in the axial direction is increased, the tape recorder becomes smaller in the height direction.

In addition, an engagement stepped portion called a lead for guiding the tape is formed on the outer circumferential 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 The running direction is guided by being lightly pressed against the lead.

There have been various types of tape loading mechanisms, that is, mechanisms for winding magnetic tape around head drums, etc., but in any case, basically, by moving the tape loading post, It is supposed to be done. That is, when a tape cassette is loaded, the tape loading post is provided with a plurality of tape loading posts located on the opposite side of the head drum, sandwiching the magnetic tape, and the tape loading post is moved to a position close to the head drum. By doing so, the magnetic tape is pulled out from the tape cassette and wound around a head drum or the like.

(D. Problem to be solved by the invention) [Figure 7] By the way, in order to downsize a VTR, etc., it is necessary to make the diameter of the head drum as small as possible, or to shorten the distance between the head drum and tape reel as much as possible. I can think of something like that.

If the diameter of the head drum is made smaller, it becomes necessary to increase the tape wrapping angle with respect to the head drum.

In this case, if the inclination of the head drum is to be kept as small as possible, the difference in level between the tape winding start position and the tape winding end position on the head drum will increase in the height direction of the tape recorder. The height of the magnetic tape pulled out from the tape cassette changes greatly between its position on the tape pulling surface of the tape cassette and the tape winding start position and/or tape winding end position of the head drum.

Therefore, it is necessary to increase the inclination of the inclined guide post provided on the tape running path, and the magnetic tape must be twisted to a large degree when it runs at the part where it is wound around such a large inclined guide post. This creates problems such as excessive stress being applied to the magnetic tape, and furthermore, the tape loading post must be moved while being displaced in the height direction of the tape recorder. The problem also arises that the mechanism becomes extremely complex.

In addition, if there is a height difference between the magnetic tape pull-out surface of the tape cassette and the tape winding start position and/or tape winding end position of the head drum, the distance between the head drum and tape reel is usually adjusted. If it is shortened, the height of the tape must be changed over 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, the tape loading method is changed between the tape winding start position and the tape winding end position, as shown in Figure 7. It is conceivable to adopt a tape loading method in which no step difference occurs in the height direction of the tape recorder. In the figure, a indicates a mechanical chassis, and b indicates a tape reel on the supply side.

C is a tape reel on the winding side, d is a magnetic tape, e is a head drum, and fl and f2 are tape loading posts.

If you do this, it will be a tape loading post.

Since fl and f2 will be moved approximately horizontally, the mechanism for moving them can be made relatively simple, and the magnetic tape b pulled out from tape reels b and c is transferred to the head drum e. Since the height does not change except for the part where it is wrapped around, it can be run without difficulty.

However, according to such a system, as can be clearly seen from FIG. 7, the inclination of the head drum e becomes extremely large, and the height of the head drum e relative to the tape recorder increases. Problems arise such as the height of the tape recorder increasing.

Furthermore, as described above, a lead is formed on the head drum, and tape loading is performed by placing the lower one of the two side edges of the magnetic tape on the lead. . Unless the step occurs at a position lower than the tape pull-out surface, all or part of the lead is at a position higher than one side edge of the magnetic tape at the tape pull-out surface position, so that the magnetic tape does not reach the head drum. When the lead is wound, the tape surface may end up being wrapped around the lead. Therefore, if the head drum rotates and the magnetic tape is run in this condition, not only will the rotating magnetic head not be able to relatively contact the tape surface in the correct positional relationship, but the tape surface will not be able to read. This can lead to serious problems such as being damaged by the edges of the blade.

Furthermore, tape unloading is performed by returning the tape loading post from the state where the magnetic tape is on the lead to the non-loading position and rotating the tape reel in the tape winding direction. All or part of the magnetic tape is displaced downward with one edge resting on the lead, so it can easily bend in its width direction or become shaky. Something like this may happen.

Such damage to the magnetic tape is more likely to occur as the level difference is larger, and the shorter the distance between the tape drawing surface and the head drum is, the more likely it is to occur.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the tape recorder of the present invention unloads the magnetic tape by unloading 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 onto the tape reel without coming into close contact with at least the head drum.

(F. Embodiment) The details of the tape recorder of the present invention will be explained below according to the embodiment shown in the attached drawings.

The embodiment shown in the drawings is an application of the present invention to a VTR. Before entering into the explanation of the VTR, an example of a tape cassette used therein will be explained.

(a, tape cassette) [Figures 1 to 6] l is a tape cassette.

Reference numeral 2 denotes a cassette case of the tape cassette 1, and the cassette case 2 has an upper bar 23 and a lower half 4, which are formed of synthetic resin and have a substantially symmetrical shape, and which are integrally connected. It is shaped like a thin box.

5 excludes both left and right ends of the front surface of the cassette case 2 (when indicating the direction of the tape cassette 1, the upward direction in FIG. 1 is the front side, and the downward direction in the same figure is the rear side). This is a tape drawer recess formed by bending the portion into a substantially inverted trapezoidal shape when viewed from above, and is located at both left and right ends of the front surface of the tape case 2, that is,
Tape outlets 6. are located on both left and right sides of the tape drawer recess 5.
7 is formed.

Reference numerals 8 and 9 denote tape reels, and the left side tape reel 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 a so-called winding side tape reel. The tape reels 8 and 9, which are take-off tape reels (hereinafter referred to as "T reels"), have reel mounting portions 10 and 10' located at the center of each of these reels, and the reel/b 10 and 10'. It consists of two flanges 11.11 and 31', 11' fixed at a position near the top end and a position near the bottom end, and the reel mounting parts 10 and 10' have engagement holes opening downward. 12 and 12' (see FIG. 1) are formed.

And tape reels 8 and 9 are the 1 nord/\b1
The lower end of the reel hub 10.
A reel pressing spring 1 attached to the top plate 16 of the cassette case 2 is attached to a protrusion 15.15 (only the one provided on the T reel 9 is shown in the drawing) formed on the upper end surface of the cassette case 10'.
7.17 (again, only the one on the T-reel 9 side is shown in the figure) is housed in the cassette case 2 with its tip end elastically contacted from above.

Reference numeral 18 denotes a front lid formed in a substantially horizontal U-shape when viewed from above, and the front @i1B indicates both ends 18a, 18 of the U-shape.
a is rotatably supported by the front end portions of both left and right side surfaces of the cassette case 2, thereby forming the two-shaped intermediate portion 18b.
The position where the front side of the cassette case 2 is closed, that is, the position shown in FIG. It is provided so that it can be moved between the position shown in the figure (hereinafter, this position will be referred to as the "open position"). still,
The front cover 18 is always given a moving force by an unillustrated resilient means to move it to the closed position.

Further, the front end 16a of the top plate 16 of the cassette case 2 is positioned so as to face the rear end of the tape drawer recess 5.

When the front surface M1B is in the closed position, the upper portion of the intermediate portion 18b is positioned so as to overlap the front end portion 16a from above.

Reference numerals 19 and 19' denote tape guides in the cassette having a substantially semi-cylindrical shape formed on the side surfaces of the tape outlets 6 and 7 on the side of the tape draw-out recess 5.

20 is a magnetic tape. The magnetic tape 20 has reel hubs 10 and 10 of two tape reels 8 and 9 at both ends thereof.
The tapes are each fixed separately and wrapped in a predetermined amount, and are passed through the path shown by the thin two-dot chain line in FIG. 1 before the tape is attached to the VTR. In this state, the magnetic tape 20 is pulled out from the S reel 8, led out of the cassette case 2 from the tape outlet 6 on the left side, passed through the front surface of the tape drawer recess 5, and exited from the tape ejection lower part on the right side to the cassette case. 2 and wound up on a T-reel 9.

(b, video tape recorder) [Figures 1 to 5] 21 is a VTR, and 22 is its mechanical chassis.

(b-1, reel stand) [Figures 1 to 5 23 and 2
4 is a reel stand, and these two reel stands 23 and 2
The one 23 on the left side of 4 is a reel stand (hereinafter referred to as the rS side reel stand) to which the S reel 8 stored in the cassette case 2 of the tape cassette l is engaged, and the reel stand 24 on the right side is A reel stand (hereinafter referred to as
This is called the ``T-side stool''.

The reel stands 23 and 24 are located near the front edge of the mechanical chassis 22 (hereinafter, when referring to the VTR 21, the downward direction in FIG. 1 is referred to as the front side, and the upward direction in the figure is referred to as the rear side). Two reel stand support shafts 25 are installed upright from positions spaced apart from each other left and right.
．． 25' is rotatably supported.

The reel stand 23.24 is connected to the reel stand support shaft 25.24.
A base shaft portion 26.26' into which the 25' is inserted, and a disk portion whose center portion is integrally formed with a portion near the lower end of the base shaft portion 26.26′ and which has gear teeth formed on its outer periphery. 27.
27', a substantially cylindrical reel mounting part 28, 28' that protrudes upward from the upper surface of the disc part 27, 27',
Engagement shaft 29. provided at the upper end of base shaft portion 26.26'.
29' (see FIG. 1), one of which is rotationally driven by a reel stand driving means (not shown) depending on a predetermined tape running mode.

(b-2, Cassette Positioning Pin) [Figs. 81 to 5 1 Reference numerals 30.30 and 31.31 are cassette positioning pins erected from predetermined positions of the mechanical chassis 22. When the tape cassette 1 is installed in the VTR 21, the cassette case 2 is placed on these pins 30.30 and 31.31, so that the cassette case 2 is positioned in the height direction and horizontal direction of the VTR 21. It is for positioning in the direction,
Of these, a substantially conical insertion portion (not shown) is formed on the upper end surface of the rear one 31.31.

(b-3, Head Drum) [FIGS. 1 to 5] Reference numeral 32 denotes a head drum, and the head drum 32 is disposed approximately in the center of the rear portion of the mechanical chassis 22 in the left-right direction. The head drum 32 is connected to a lower drum 34 fixed to a drum support 33 provided on the mechanical chassis 22 and an upper drum 35 fixed to a rotating shaft (not shown) rotatably supported by the lower drum 34. Becomes,
It is provided with its axial direction tilted substantially toward the left at a predetermined inclination angle.

In addition, the lower end surface of the outer peripheral portion of the upper drum 35 and the lower end surface of the lower drum 3
4, and a plurality of video heads (not shown) are positioned in the gap and rotated integrally with the upper drum 35. Note that 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 circumferential surface over a range of approximately 300° in terms of center angle, and has one end (hereinafter referred to as an "inlet") located at a portion of the outer circumferential surface slightly to the left from the rear end. ) is the highest, and from there the first
It is formed to extend substantially spirally in the counterclockwise direction in the figure.

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

(b-4, tape loading post) [Figures 1 to 5] 37, 38, and 39 are tape loading posts. These tape loading posts 37 and 38.39
is shown as a solid line in FIG. 1 before tape loading, and the position shown in FIGS. 2 and 3 (
Hereinafter, this will be referred to as the "non-loading position." ),
When tape loading is performed, the tape is moved to the position shown by the two-dot chain line in FIG. 1 and shown in FIG.
Magnetic tape 2 from tape cassette 1 installed in R21
This is for extracting 0 and passing it through a predetermined bus in the VTR 21.

Of these three tape loading posts 37 and 38.39, the leftmost one 37 is a tape loading post that guides a part of the magnetic tape 20 to a position close to the tape winding start position on the head drum 32. (Hereinafter, as necessary, this tape loading post 37 will be referred to as the "entrance side loading post"), and the other two tape loading posts 38 and 39
is a tape loading post that guides the other part of the magnetic tape 20 to a position close to the end position of the tape winding on the head drum 32 (hereinafter, these two tape loading posts 39 will be referred to as "exit" as needed). In addition, if necessary, one of the two exit side loading posts 38 and 39, which is located on the right side when the two exit side loading posts 38 and 39 are in the position shown by the solid line in FIG. The one on the left side 39 is called the "loading post with exit temperature 1" and the "loading post with exit temperature 2".

(b-'4-a, entrance side loading post) [
FIGS. 1 and 3] The entrance side loading post 37 has a roller structure rotatably supported by a support shaft 41 erected from a moving block 40 (see FIG. 3), and It is located between two flanges 42 and 42 provided axially apart from each other in 41, and has a posture in which its axial direction extends substantially along a direction perpendicular to mechanical chassis 22.

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

The loading post 38 of the outlet side temperature 1 has an upper part 38a occupying half of the upper path in the axial direction, which is formed to have a larger diameter than the lower part 38b, and is rotatably attached to a support shaft 44 erected from a moving block 43. It has a supported roller structure. Further, the lower end of the loading post 38 on the outlet side temperature 1 is located on a flange 45 fixed to the support shaft 44.

Incidentally, the loading post 38 of the outlet side temperature 1 is provided in an inclined manner so that when the loading post 38 reaches the loading completion position, the axial direction of the post 38 is tilted slightly toward the left and rearward.

Further, the lower end of the loading post 39 for the outlet side temperature 2 is embedded in the movable block 43, and when the loading post 39 has reached the loading completion position, it is located approximately on the right side of the loading post 38 for the outlet side temperature 1. It is tilted so that it is positioned tilted to the right.

Note that the upper portions 38a of the loading post 37 on the inlet side and the loading post 38 on the outlet side temperature 1 are located at approximately the same height as the upper drum 35 of the head drum 32, and
The loading post 39 for the outlet temperature 2 has approximately the same length as the loading post 38 for the outlet temperature 1.

(b-4-c, Movement) The moving blocks 40 and 43 are supported by moving means of a tape loading mechanism (not shown), and are moved when the moving means is moved, whereby the tape loading post 37 and 38 and 39 are moved approximately horizontally between the non-loading position and the loading completion position.

(b-5, other members) [Fig. 1] 46 is a capstan located approximately in the middle between the head drum 32 and the right edge of the mechanical chassis 22;
The capstan 46 is rotated at a constant speed during recording or reproduction.

Reference numerals 47 and 48 denote tape guide posts provided at a position approximately to the right of the head drum 32 of the mechanical chassis 22 and a position diagonally to the rear of the head drum 32 of the mechanical chassis 22, and 49 a tape guide post disposed on the left side of the capstan 46. This tape guide post 49 is a guide post, and is provided in an attitude that is inclined toward the substantially right side.

Furthermore, 50 is a pinch roller, 251 is a fridashi guide,
52 is a tenregibine, and these pinch rollers-50
, the fridashi guide 51 and the tension pin 52 are in the position shown by the solid line in FIG. 1 (hereinafter referred to as the "non-loading position") in the state before tape loading is performed.
), and when tape loading is performed, the first
It is moved to the position indicated by the two-dot chain line in the figure (hereinafter referred to as the "loading completion position").

(c. Attaching the tape cassette) The tape cassette 1 is attached to a predetermined cassette attachment position of the VTR 21, for example, in a primary manner.

That is, when the tape cassette 1 is inserted into the outer casing (not shown) of the VTR 21 through a cassette insertion opening formed on the front surface thereof, the tape cassette 1 is attached to a cassette holding member of a cassette loading mechanism (not shown). Note that when the cassette holding member is in the initial position where the tape cassette 1 is attached to it, the lower part of the magnetic tape 20 of the tape cassette I attached to it is
It is at a height opposite to the road surface of the upper drum 35. In addition, the front cover 18 of the tape cassette l is
When the tape is attached to the cassette holding member, it is moved to the open position by a lid raising member provided on the cassette holding member, and this state is maintained until the tape is removed from the cassette holding member. Ru.

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 continued 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 road at the front end of the outer peripheral surface of the upper drum of the head drum 32.

From this state, the cassette holding member is moved downward until the cassette case 2 is placed on the cassette positioning pins 30.30 and 31.31.

Therefore, the cassette case 2 is attached to the cassette positioning pin 3.
0.30 and 31.31, thereby positioning the cassette case 2 relative to the mechanical chassis 22 in the height direction. The inserted portion (not shown) is inserted into a positioning hole (not shown) formed in the bottom surface of the cassette case 2, thereby positioning the cassette case 2 in the horizontal direction.

The tape reel 8.9 housed in the cassette case 2 is connected to the cassette positioning pin 30 by the cassette case 2.
．． 30 and 31.31, its reel hub 10.10' is placed on the reel rest 28.28' of the reel stand 23.24. Therefore, the cassette case 2
．． 31, the tape reel 8.
9 is positioned slightly raised from the bottom plate 13 of the cassette case 2, and is now pressed against the reel stand 23, 24 by the reel presser spring 17, 17.

Also, together with this, the engagement hole 12. of the tape reel 8.9.
12', the engagement shafts 29.29' of the reel stands 23.24 are relatively inserted, whereby the S reel 8 is rotated integrally with the S side reel stand 23, and the T reel 9 is rotated integrally with the S side reel stand 23. It is in a state where it is rotated integrally with the table 24.

Thus, the tape set 1 is installed at a predetermined cassette installation position in the VTR 21.

(d. Tape path during non-loading) On the other hand, the approximately central portion of the portion of the magnetic tape 20 led out of the cassette case 2 is moved downward while running over the outer peripheral surface of the upper drum 35, and the tape reel 8. 9 is the reel stand 23
．． 24, the path shown in solid line in FIG. 1 is passed through. That is, in this state, the magnetic tape 2
0 to the outside of the cassette case 2, the approximately center part of which is wrapped around the front end of the outer circumferential surface of the upper drum 35 in an approximately inverted shape (hereinafter, this path will be referred to as "the path during non-loading"). It will be passed through a "tape pass").

In this state, the portion of the magnetic tape 2o that is led out of the cassette case 2 is not connected to the lead 36 formed on the lower drum 34, as can be clearly seen in FIGS. 2 and 3. They are positioned without any contact, and are at a height above the entrance side end of the lead 36, that is, the highest part of the lead 36.

(e, tape loading) [Figures 1 to 4] (e-1, initial state) [Figures 1 to 3] Tape force setting) When 1 is attached to the VTR 21 as described above, the tape loading posts 37 and 38.39;
The pinch roller 50, the fridging guide 51, and the tension pin 52 are all relatively located within the tape drawer recess 5 of the cassette case 2. Therefore, these movable members are located in front 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 part of it in the height direction is It will be located at the same height as the magnetic tape 20.

In particular, the loading post 37 on the inlet side has its flange 42
．． 42 is located at a height substantially opposite to both ends of the magnetic tape 20 in the width direction, and the loading post 38 with an exit side ratio of 1 has an upper portion 38a, that is, a portion formed to have one large diameter, which is located at a height substantially opposite to both ends of the magnetic tape 20 in the width direction. The upper half of the loading post 39 with an exit side ratio of 2 is also opposed to the magnetic tape 20 .

(e-2, loading) [Figures 1 to 4] (e-2-a, movement of moving members) Therefore, when a command to perform tape loading is issued from this state, the tape loading bosses 37 and 38
．． 39 is moved toward the loading completion position, and the pinch roller 50, fridging guide 51, and tension pin 52 are also moved toward the loading completion position.

Incidentally, as described above, the tape loading posts 37 and 38, 39 are all moved approximately horizontally, and the pinch roller 50, the fridging guide 51, and the tension pin 52 are moved approximately horizontally.
is also moved approximately horizontally.

As a result, the magnetic tape 20 is pulled out from the cassette case 2, and a part of the pulled out part is wrapped around the outer peripheral surface of the head drum 32 at a wrapping angle of about 300 degrees, and the other part is wrapped around the outer peripheral surface of the head drum 32. It is held between the stun 46 and the pinch roller 50, and is passed through a path as shown by the thick two-dot chain line in FIG.

The magnetic tape 20 is wound around the head drum 32 at tape loading posts 37 and 38, 39.
Since both are moved horizontally, the pass height of the magnetic tape 20 is maintained at the above-described non-loading time.

For this reason, tape loading posts 37 and 38.3
At the time when the movement to the loading completion position such as 9 is completed, at least the head drum 32 of the magnetic tape 20
The portions of the magnetic tape 20 wound around the head drum 32 are located at approximately the same height, so that the portion of the magnetic tape 20 on the outer peripheral surface of the head drum 32 is located at the entrance side loading post 37.
The position where winding of the magnetic tape 20 starts after leaving the head drum 32 (hereinafter referred to as the "wrap start position") and the position where winding of the magnetic tape 20 ends (hereinafter referred to as the r winding end position) There is no difference in level between the two.

Furthermore, since the magnetic tape 20 is wound around the head drum 32 in this manner, it comes close to or lightly rides the lead 36 from above at the winding start position, but as the winding is done, At least the portion does not cover the lead 36.

(e-2-b, tape running) And tape loading posts 37 and 38.39
When the movement to the loading completion position is completed, the capstan 46 is rotated for a certain period of time, and the T-side
The reel stand 24 is rotated, and the T-reel 9 is rotated in the tape winding direction.

This causes the magnetic tape 20 to run.

Then, a predetermined tension is generated on the magnetic tape 20, and
In the part wrapped around the loading post 38 of the exit survey 1, the loading post 38 of the exit survey 1 is wrapped around the loading post 38 of the exit survey 1.
Since the magnetic tape 2 is inclined toward the left side, the magnetic tape 2
Since a moving force acting diagonally downward to the right approximately acts on the 0, this part gradually moves downward across the upper part 38a, and finally, as shown in FIG. 4(B), It will be wrapped around the lower part 38b. In addition, the lower part 38b
The part that is wrapped here is 7.
It is held by being prevented from moving downward by the lunge 45.

In this state, the winding end position on the head drum 32 moves downward, so that the magnetic tape 20
is wound approximately spirally around the head drum 32 along the lead 36.

In this state, there will be a difference in height between the height of the part of the magnetic tape 20 wrapped around the loading post 39 of the exit survey 2 and the height of the tape ejection lower part on the right side of the cassette case 2. 20 is raised to the height of the tape output lower between the position where it is wrapped around the loading post 39 of the exit survey 2 and the position where it is wrapped around the tape loading post 49 located on the left side of the capstan 46.

Thus, this state becomes a 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 the tape, or a command for fast forwarding or winding the tape is issued from the tape loading completion state, neither of the tape reels 8 and 9 is activated. First, the tape loading mechanism starts an 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 50, fridging guide 51, and ten-leg pin 52 are also moved to the non-loading position.

Then, tape loading posts 37 and 38.39
moves away from the magnetic tape 20, so the magnetic tape 20
The portion of the magnetic tape 20 that was wrapped around the head drum 32 becomes separated from the outer peripheral surface of the head drum 32, or at least floats so that it does not come into close contact with it, and as shown in FIG. According to
It begins to move upward in an attempt to be at the same height as the part wound on the tape reel 8.9. This upward moving force becomes stronger as the amount pulled out of the cassette case 2, that is, the length becomes shorter.

Therefore, the rotation of the tape reel 8 or 9 in the tape winding direction is limited to at least the tape loading posts 37 and 38.
．． 39 is separated from the magnetic tape 20. Incidentally, the timing at which the rotation of the tape reel 8 or 9 is started is not necessarily specified, but for example, as shown in FIG.
．． The tape loading process may be performed by selecting the timing when the tape loading post 39 reaches a position approximately halfway between the non-loading position and the loading completion position, or the tape loading process may be started after the tape loading posts 37 and 38, and 39 have returned to the non-loading position. It is also possible. In any case, the timing at which the tape reel 8 or 9 starts rotating in the tape winding direction should be determined by taking into consideration the weight and rigidity of the magnetic tape used, the tape wrapping angle with respect to the head drum 32, etc. be.

Therefore, when tape unloading is performed,
The portion of the magnetic tape 20 that had been wound around the outer circumferential surface of the head drum 32 has been separated from the outer circumferential surface, or at least does not come into close contact with the outer circumferential surface, and the height of the portion wound around the tape reel 8.9 has been increased. In other words, the tape is wound onto the tape reel 8 or 9 in a state where it has returned to the height before tape loading was started or a height close to this.

Therefore, tape unloading is performed with the magnetic tape 20 at a higher position than the leads 36 formed on the head drum 32, so that the tape surface does not come into contact with the edges of the leads 36. There isn't.

(G. Effects of the Invention) As is clear from the above description, the tape recorder of the present invention includes a head drum equipped with a rotating magnetic head, and a reel stand for rotating a tape reel wound with magnetic tape. When the magnetic tape is being passed through a path in a non-loading state, it is positioned on the opposite side of the head drum, sandwiching the magnetic tape, and when tape loading is performed, it is moved to a loading completion position close to the head drum. a tape loading post that pulls out the magnetic tape from the tape reel and wraps a portion of the magnetic tape around the head drum at a predetermined wrapping angle; unloading of the magnetic tape is performed while the tape loading post is at least separated from the magnetic tape It is characterized in that the reel is rotated in the tape winding direction.

That is, according to the present invention, when tape unloading is performed, the magnetic tape is wound onto the tape reel without being in close contact with the head drum. The reeds are formed in such a way that they will not bend or become smudged.

Additionally, when the tape loading post is removed from the magnetic tape after tape loading has been completed, the portion of the magnetic tape that was previously wrapped around the head drum is displaced to the height of the tape extraction surface due to its own rigidity. Therefore, by selecting the timing between the start of movement of the tape loading post and the start of tape winding operation by the tape reel when performing tape unloading, the magnetic tape that has been wound around the head drum until then can be It is also possible to wind up the tape in a state in which the portion of the tape is returned to the same height as or close to the height of the surface from which the tape is pulled out from the tape cassette.

According to the present invention, even if the difference in level 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 when performing tape unloading can be performed at this level. This can be done without applying any unreasonable force.

In the above-described embodiment, the magnetic tape is wound around the head drum during tape loading so that the magnetic tape is held at the same height as the surface from which the tape is pulled out from the tape cassette. By running the magnetic tape for a certain period of time from the wound state, the magnetic tape rides on the lead of the head drum and is wound approximately spirally around the lead. Not only tape unloading but also tape loading can be performed without the magnetic tape coming into contact with the leads of the head drum.

Further, in the above-described embodiment, the present invention is applied to a tape loading method in which the level difference between the tape winding start position and the tape winding end position on the head drum is at a position 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 where the step is at any height relative to the surface from which the tape is pulled out from the tape cassette.

[Brief explanation 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. 2 [Δ is a right side view with a part of the main part cut away and shown with the tape cassette installed; FIG. 3 is a left side view with a part of the main part cut away with the tape cassette installed; The figure is a schematic right side view showing the final operation in tape loading from (A) to (B) in order. Figure 5 is a schematic right side view showing the initial operation in tape unloading. Figure 6 is a schematic right side view showing the initial operation in tape unloading. FIG. 7 is a perspective view showing an example of a tape cassette, and is a diagram conceptually showing an example of a tape loading method. Explanation of symbols 8.91I...Tape reel, 20.φ.Magnetic tape, No. 21.Tape recorder, 23.24..Reel stand, 32.O.Head drum. 37.38,39. −・・Table loading post

Claims (1)

[Scope of Claims] A head drum having a rotating magnetic head, a reel stand for rotating a tape reel wound with magnetic tape, and a magnetic tape when the magnetic tape is passed through a path in a non-loading state. It is positioned on the side opposite to the head drum while sandwiching the tape, and when tape loading is performed, it is moved to a loading completion position close to the head drum, thereby pulling out the magnetic tape from the tape reel and placing a portion of it on the head drum. and a tape loading post for winding a winding angle, and unloading of the magnetic tape is performed by rotating the tape reel in the tape winding direction with the tape loading post at least separated from the magnetic tape. tape recorder