JPH075561Y2 - Tape loading mechanism in magnetic recording / reproducing apparatus - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tape loading mechanism in a magnetic recording / reproducing apparatus such as a VTR.

(Prior Art) FIGS. 6 to 8 relate to a tape loading mechanism in a conventional magnetic recording / reproducing apparatus, and FIG. 6 is a plan view of the tape loading mechanism in a state before loading a magnetic tape in a tape cassette. FIG. 7 is a plan view of the tape loading mechanism in a state where the magnetic tape is pulled out from the tape cassette and loaded on the rotary magnetic head drum and the fixed magnetic head, and FIG.
The drawing is a plan view of the tape loading mechanism in a state where the magnetic tape is pulled out from the tape cassette and loaded only on the fixed magnetic head.

First, referring to FIG. 6, a conventional tape loading mechanism will be described. Reference numeral 2 is a tape cassette in a state where it is mounted at a predetermined position, and 4 is arranged with respect to the tape cassette 2 in the pull-out direction of the magnetic tape. In addition, a rotary magnetic head drum around which a magnetic tape is wound from one half circumference side which is the left side in the figure to the other half circumference side which is the right side in the figure, 6 is a midway portion of the other half circumference side of the rotary magnetic head drum 4. Is a fixed magnetic head which is arranged facing the right side in the figure with a predetermined distance therebetween. 8 is a supply side guide roller fixed on the supply base 9, 10 is a winding side guide roller fixed on the winding base 11, 12 is a first stopper for the supply side guide roller 8, and 14 is a winding side. A second stopper for the guide roller 10, 16 is a first guide path of the supply side guide roller 8 to the first stopper 12, and 18 is a second guide of the winding side guide roller 10 to the second stopper 14. Path, 20 is a first rotary lever having one end side (marked with X in the figure) rotatably provided, and a tension pole 22 is attached to the other end, and 24 and 26 are rotated at one end (marked with X) The pinch roller 28,
Second and third rotation levers 32 to which the leading pin 30 is attached, 32
Is a fourth rotation lever, which is rotatably provided at one end (marked with X in the figure) and has a pull-out post 34 attached at the other end,
36 to 42 are tape guides, 44 is a capstan shaft 46 is a tape guide, 48 is a drive gear, 50 is a first driven gear driven by the drive gear 48, and 52 is a first driven gear thereof.
A second driven gear driven by the drive gear 48 via 50, a third driven gear 54 driven by the drive gear 48 via both driven gears 50, 52, and a 56 driven by the second driven gear 52. The driven first loading gear 58 is a second loading gear driven by the third driven gear 54.
Each of these gears constitutes a drive mechanism that guides each of the bases 9 and 11 along the guide paths 16 and 18.

The first relay lever 60 has one end fixed to the supply side guide roller 8 and the other end fixed to the second loading gear 58. Reference numeral 62 denotes one end to the winding side guide roller 10 and the other end to the first loading. It is a second relay lever fixed to the gear 56.

FIGS. 6 and 7 show the operation when the magnetic tape in the tape cassette 2 is loaded from the state shown in FIG. 6 to the state shown in FIG. 7 on the rotary magnetic head drum 4 in the conventional tape loading mechanism having the above configuration. Will be described with reference to.

First, when the drive gear 48 rotates in the clockwise direction indicated by the arrow, the first, second and third driven gears 50, 52 and 54 are rotated in the directions indicated by the arrows. by this,
Each loading gear 56, 58 is rotated in the direction of the arrow. Then, the relay levers 60 and 62, the other ends of which are fixed to the loading gears 56 and 58, are moved along with the rotation of the loading gears 56 and 58, and the one ends of the relay levers 60 and 62 are moved in accordance with this movement. The supply-side guide roller 8 and the take-up-side guide roller 10 which are fixed to each other are guided in the directions of the corresponding stoppers 12 and 14 along the corresponding guide paths 16 and 18, respectively, and the rotary levers 20 and 24,26 and
Also in 32, one end is the center of rotation and the other end is the broken line a to
The tension pole 22, the pinch roller 28, the leading pin 30, and the pull-out post 34, which are respectively provided at the other ends, move along the locus indicated by d, and are moved in the locus direction.

As a result, the magnetic tape T in the tape cassette 2 is
While being guided along the respective tape guides 36 to 42, it is wound around one half and the other half of the rotary magnetic head drum 4 in a reverse Ω shape in the figure, and loaded so as to be attached to the fixed magnetic head 6. .

Next, the operation for loading the magnetic tape in the tape cassette 2 from the state shown in FIG. 6 to the state shown in FIG.
A description will be given with reference to the drawings and FIG. In this case, the drive gear 48 and the rotary lever 20 do not operate respectively, and therefore, the supply side guide roller 8 and the winding side guide roller 10
Tension pole 2 stays in the initial position shown in Fig. 6,
On the other hand, each of the rotary levers 24, 26, 32 is rotated about one end side thereof as a rotation center and the other end side is rotated along a locus shown by broken lines b, c, d in the figure. By this rotation, the pinch roller attached to the other end of each rotary lever 24, 26, 32
28, the leading pin 30, and the extraction post 34 are moved along the locus. Then, the magnetic tape T in the tape cassette 2 is pulled out and loaded so as to come into contact with the fixed magnetic head 6 as shown in FIG.

By the way, in the conventional tape loading mechanism having the above structure, when the magnetic tape T is loaded on the rotary magnetic head drum 4, the rotary lever 32 and the pull-out post 34 attached to the rotary lever 32 of FIG. Has become. However, in order to reduce the component cost of the magnetic recording / reproducing apparatus and the assembly cost by reducing the component parts, the pull-out post 34 and the like which are not necessary in the loading mode as shown in FIG. This is not desirable, and there were strong product and technical demands to reduce it if possible.

(Object of the Invention) The present invention makes it possible to reduce the number of parts by eliminating the pull-out post which was required when loading the magnetic tape on the fixed magnetic head, thereby simplifying the configuration. In addition, it is an object of the present invention to provide a tape loading mechanism that can be made inexpensive at low cost.

(Structure of the Invention) A tape loading mechanism according to the present invention is arranged in a magnetic tape pull-out direction of a tape cassette mounted at a predetermined position, and a magnetic tape is wound from one half circumference side to another half circumference side. A head drum, a fixed magnetic head that is arranged to face the middle part of the other half of the rotary magnetic head drum at a predetermined distance, and a first magnetic head that is arranged near one half of the rotary magnetic head drum. A supply-side guide roller fixed on a supply base guided along a guide path, and a winding base guided along a second guide path arranged near the other half circumference side of the rotary magnetic head drum. It comprises a winding-side guide roller fixed on the upper side, and a drive mechanism for driving the both bases and both guide rollers along the first and second guide paths. Thus, in the first loading mode in which the magnetic tape is loaded only on the fixed magnetic head, the drive mechanism moves the take-up side guide roller to the middle part on the other half circumference side of the rotary magnetic head drum. In the second loading mode in which the magnetic tape is loaded on the rotary magnetic head drum and the fixed magnetic head while being driven along the two guide paths, the rotary magnetic head drum reaches the final end on the other half circumference side. A first loading gear for driving the winding-side guide roller along the second guide path, which meshes with a second driven gear driven by a driving gear and drives only the winding base; , A fourth driven gear that meshes with the second driven gear via a third driven gear that idles in the first loading mode A second loading gear for driving the feed base only each other chewing the fourth driven gear, wherein during the transition to the second loading mode 3
And a pressing lever for pressing the driven gear of the third driven gear upward, a protrusion is formed on the lower surface of the fourth driven gear, and the upper surface of the third driven gear is pressed upward. Is characterized in that a fitting hole to be fitted into the projection is formed.

According to this structure, when the magnetic tape is loaded only on the fixed magnetic head, the drive mechanism drives the take-up side guide roller to a middle portion on the other half circumference side of the rotary magnetic head drum. Then, by the drive, the magnetic tape is put in a so-called half-loading state on the halfway side of the rotating magnetic head drum on the other half circumference side, and is attached to the fixed magnetic head by the winding side guide roller.

In this case, the supply-side guide roller and the take-up-side guide roller are guided from the half-loading position along the guide path to the both half sides of the rotary magnetic head drum so that the magnetic tape serves as the fixed magnetic head. It can be loaded onto a rotating magnetic head drum.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5. In the present embodiment, for convenience of explanation, the case where the magnetic tape is loaded only on the fixed magnetic head is called the first loading mode, and the case where it is loaded on both the fixed magnetic head and the rotary magnetic head drum is called the second loading mode. To do. FIG. 1 is a plan view of a tape loading mechanism before loading in a magnetic recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a side view of a main part of FIG. 1, and FIG. FIG. 3 is an enlarged side view of each gear portion of FIG. 2 in the first loading mode, and FIG. 3B is an enlarged side view of each gear portion of FIG. 2 in the second loading mode. FIG. 4 is a plan view of the tape loading mechanism of this embodiment in the first loading mode state, and FIG. 5 is a plan view of the tape loading mechanism of this embodiment in the second loading mode state. is there.

In these figures, parts and parts corresponding to the tape loading mechanism of FIGS. 6 to 8 according to the conventional example are given the same reference numerals, and parts and parts having the same reference numerals are named. Only a listing is given and a detailed description thereof is omitted. That is, in these drawings, 2 is a tape cassette, 4 is a rotary magnetic head drum,
6 is a fixed magnetic head, 8 is a supply side guide roller, 9 is a supply base on which the supply side guide roller 8 is mounted, 10 is a winding side guide roller, 11 is a winding side on which the winding side guide roller 10 is mounted. Take bases, 12 and 14 are first and second stoppers respectively, 16 and 18 are first and second guide paths, and 20 is first.
Rotation lever, 22 is a tension pole, 24 and 26 are second and third rotation levers, 28 is a pinch roller, 30 is a leading pin, 36 to 42 are tape guides, 44 is a capstan shaft, and 46 is a tape guide. , 48 is a driving gear, 50 is a first driven gear, 52 is a second driven gear, and 60 and 62 are first and second respectively.
It is a relay lever of.

The above configuration of the tape loading mechanism of this embodiment is similar to that of the conventional example.

In this embodiment, the fourth rotary lever in the conventional example
Neither 32 nor the extraction post 34 provided at the other end of the fourth rotation lever 32 is provided. In addition, the drive device according to the present embodiment is configured such that the first driven gear 50 is engaged with the second driven gear 52 driven by the drive gear 48 to drive only the winding base 11. The loading gear 56 and the third that idles in the first loading mode
The fourth driven gear 68, which meshes with the second driven gear 52 via the driven gear 64 of the above, and is fixed to the same rotary shaft 66 as the third driven gear 64, and the fourth driven gear 68. The second loading gear 58 that drives only the supply base 9 even if it meshes with the gear 68, and the third loading gear 58 that rotates clockwise about the rotation fulcrum 70 at the time of transition to the second loading mode. And a pressing lever 72 for pressing the driven gear 64 upward along the rotary shaft 66.

In this case, the first loading gear 56 is driven by the second driven gear 52, and the second loading gear 58 is driven by the fourth driven gear 68.

Further, as shown in FIG. 3A, a fitting hole 74 is formed on the upper surface of the third driven gear 64, and a projection 76 that can be fitted into the fitting hole 74 is formed on the lower surface of the fourth driven gear 68. Has been formed. In addition,
When the pressing lever 72 is rotated clockwise about its rotation fulcrum 70, the third driven gear 64 is pressed upward by its one end with the lower surface of the third driven gear 64, as shown in FIG. 3B.
As a result, the third driven gear 64 is slid upward along the rotation shaft 66. Then, the protrusion 76 formed on the lower surface of the fourth driven gear 68 is inserted into the fitting hole 74 formed on the upper surface of the third driven gear 64.

Regarding the first loading mode for loading the state shown in FIG. 1 to the state shown in FIG. 4 in the tape loading mechanism of the present embodiment having the above configuration, FIG. 1, FIG.
A description will be given with reference to FIGS. 3A and 4.

First, when the tape cassette 2 is mounted and the drive gear 48 is rotated in the direction of the arrow in the figure, the first loading gear 56 is rotated via the driven gears 50 and 52. First
When the loading gear 56 is rotated, the second relay lever 62 whose one end is fixed to the first loading gear 56 moves in the rotation direction of the first loading gear 56. Then, as the second relay lever 62 moves, its second
The winding side guide roller 10 fixed to the other end of the relay lever 62 of is guided along the second guide path 18, and
The second and third rotary levers 24 and 26 are also rotated clockwise in the figure around one end indicated by a cross, whereby the other ends of the rotary levers 24 and 26 are traced by broken lines c and d. Move along. Then, the pinch roller 28 and the leading pin 30 fixed to the other ends of the rotary levers 24 and 26 are moved along the loci of the broken lines c and d. By such an operation, as shown in FIG. 4, the magnetic tape T is pulled out from the tape cassette 2 and driven to a middle part on the other half circumference side of the rotary magnetic head drum 4 and then attached to the fixed magnetic head 6. State, that is, the first loading mode state.

In this case, as shown in FIG. 3A, since the projection 76 on the lower surface of the third driven gear 68 is not fitted into the fitting hole 74 on the upper surface of the second driven gear 64, the rotational force of the second driven gear 64 is not increased. Is the third driven gear
Since it is not transmitted to the 68, the second loading gear 58 cannot rotate, and thus the first relay lever 60
Since it cannot move, the supply side guide roller 8 does not move from the initial position in FIG.

In this way, the tape loading mechanism of the present invention can load the magnetic tape T in the first loading mode without the pull-out post.

Next, a case where the magnetic tape T is loaded in the second loading mode will be described with reference to FIGS. 1, 2, 3B and 5. In the second loading mode, even from the initial position of FIG.
If the loading is to be performed from the loading mode of the winding magnetic recording medium, as shown in FIG. 4, the winding side guide roller 10 is moved to the middle part of the other half circumference side of the rotary magnetic head drum 4, that is, the winding side. Since the side guide roller 10 is at the moving position, the magnetic tape T can be loaded from either half-loaded state.

In the present embodiment, the operation from the initial position to the first loading mode has been described above. Therefore, in order to avoid duplication of description, when shifting from the first loading mode state to the second loading mode. I will explain in.

First, the drive gear 48 is further rotated from the state shown in FIG. 4 in the direction indicated by the arrow in the figure. Then, the pressing lever 72 is rotated clockwise about the rotation fulcrum 70. By this rotation, the lower surface of the second driven gear 64 is pressed upward by one end of the pressing lever 72, and as a result, the third driven gear is formed in the fitting hole 74 formed in the upper surface of the second driven gear 64.
The protrusion 76 formed is inserted into the lower surface of the 68. By this insertion, the third driven gear 68 is rotated together with the rotation of the second driven gear 64. When the third driven gear 68 rotates,
The second loading gear 58 also rotates, and the first relay lever 60 attached to the loading gear 58 is moved. When the first relay lever 60 is moved,
The feed side guide roller 8 attached to it is also the first
You will be guided along the guideway 16. In this case, the rotation of the second driven gear 64 also rotates the first loading gear 56 and the first relay lever 62 attached thereto is also moved, so that the winding-side guide roller 10 and the second guide gear 62 are also moved. Moved along path 18.

As a result, the supply side guide roller 8 and the winding side guide roller 8
10 and the corresponding stoppers 12 and 14, that is,
The magnetic tape T is driven until it hits the stoppers 12 and 14 provided at the final ends of the first and second guide paths 16 and 18, respectively, and the magnetic tape T is attached to the fixed magnetic head 6 and It is loaded in the second loading mode wound around the rotary magnetic head drum 4.

(Effect of the Invention) As described above, according to the present invention, since the drawer post is not required in any loading mode, the number of parts is reduced and the configuration is simplified. As a result, the parts and the assembly cost thereof are reduced. Can be further reduced.

[Brief description of drawings]

1 to 5 relate to an embodiment of the present invention. FIG. 1 is a plan view of a tape loading mechanism in a magnetic recording / reproducing apparatus according to the embodiment, and FIG. 2 is a side view of a main part of FIG. Fig. 3A is an enlarged side view of each gear part of Fig. 2 in the first loading mode, Fig. 3B is an enlarged side view of each gear part of Fig. 2 in the second loading mode, and Fig. 4 is FIG. 5 is a plan view of the tape loading mechanism of this embodiment in the first loading mode state, and FIG. 5 is a plan view of the tape loading mechanism of this embodiment in the second loading mode state. 6 to 8 relate to a conventional example, FIG. 6 is a plan view of a tape loading mechanism according to the conventional example, and FIG.
FIG. 8 is a plan view of the conventional example in the loading mode of FIG.
The figure is a plan view of the conventional example in the first loading mode. 2 ... tape cassette, 4 ... rotary magnetic head drum,
6 ... Fixed magnetic head, 8 ... Supply side guide roller, 10
...... Winding side guide roller, 12,14 …… Stopper, 16,18 ・ ・ ・
… Guideway, 48 …… Drive gear, 50, 52, 64, 68 …… Driven gear, 56 …… First loading gear, 58 …… Second loading gear, 60 …… First relay lever, 62 ...... Second relay lever.

Claims (1)

[Scope of utility model registration request] 1. A rotary magnetic head drum, which is arranged in a magnetic tape pull-out direction of a tape cassette mounted at a predetermined position and around which a magnetic tape is wound from one half circumference side to another half circumference side, and the rotary magnetic head drum. A fixed magnetic head that is arranged to face the middle part of the other half circumference side with a predetermined distance, and a supply that is guided along a first guide path that is arranged near the one half circumference side of the rotary magnetic head drum. A supply-side guide roller fixed on the base, and a winding-side guide fixed on the winding base guided along a second guide path arranged near the other half circumference of the rotary magnetic head drum. A tape loading mechanism in a magnetic recording / reproducing apparatus, comprising: a roller; and a drive mechanism for driving the both bases and both guide rollers along a first and a second guide path. When the drive mechanism is in a first loading mode for loading the magnetic tape only on the fixed magnetic head,
The winding-side guide roller is driven along the second guide path to a middle portion on the other half circumference side of the rotary magnetic head drum, while the magnetic tape is loaded on the rotary magnetic head drum and the fixed magnetic head. In the second loading mode, the winding-side guide roller is driven along the second guide path to the final end on the other half circumference side of the rotary magnetic head drum, and is driven by the drive gear. It meshes with the second driven gear through a first loading gear that meshes with the second driven gear to drive only the winding base, and a third driven gear that idles in the first loading mode. A fourth driven gear, and a second loading gear that meshes with the fourth driven gear to drive only the supply base,
The third driven gear is provided with a pressing lever which is pressed upward when shifting to the second loading mode, and a projection is formed on the lower surface of the fourth driven gear, and the third driven gear is also formed. A tape loading mechanism in a magnetic recording / reproducing apparatus, wherein a fitting hole is formed on an upper surface of a driven gear to be fitted into the protrusion by being pressed upward.