JP2897489B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head cylinder on which a magnetic head is mounted, which is driven by winding a magnetic tape around the magnetic head and slidingly contacting the magnetic head with the magnetic tape.
The present invention relates to a magnetic recording and reproducing apparatus such as a video tape recorder that records and reproduces information signals of video signals.

[0002]

2. Description of the Related Art In recent years, magnetic recording / reproducing devices such as cassette type video tape recorders have become smaller and lighter.
In video movies, the diameter of the rotating head cylinder is set to 2/3 of the standard type, and the winding angle is set to 285.
As a degree, a type using a four-head type small-diameter cylinder has become mainstream.

The configuration of a conventional magnetic recording / reproducing apparatus will be described below with reference to FIG. FIG. 21 is a plan view of a conventional magnetic recording / reproducing apparatus. In FIG. 21, reference numeral 101 denotes a cassette having a built-in reel around which a magnetic tape is wound, and reference numeral 102 denotes a rotating cylinder in which magnetic heads 103a to 103d are divided at 90 degrees on a circumference.

The tape guide posts 104a and 104b are disposed in the cassette opening (shown by broken lines) when a cassette is mounted, and when the cassette detection switch (not shown) detects the cassette mounting, the tape guide posts 104a and 104b are disposed. 104b performs tape loading by the loading ring 111 along the path indicated by the arrow,
It is fixed at a predetermined position. Further, in conjunction with this, the cassette 101 moves toward the rotary cylinder 102 and is fixed at a predetermined position. 105a, 105b
Is an inclined post, and the inclined post 105a is fixed to the same base as the tape guide post 104a. The inclined post 105b is fixed on the base 109. Reference numeral 106 denotes a capstan for running the magnetic tape 110 at a predetermined speed. The pinch roller 108 presses the magnetic tape 110 against the capstan 106 to transmit the rotational force of the capstan 106 to the magnetic tape 110, 110 is configured to be transferred at a predetermined speed.

[0005]

However, in the above-described conventional configuration, the tape guide post 10 is placed in the space behind the rotary cylinder 102 after the tape loading is completed.
4a and 104b are located, and the depth dimension of the mechanism is increased by that amount, which has a problem that it becomes an obstacle to further miniaturization.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a miniaturized VTR whose mechanism is simple and which is determined by the size of a rotary cylinder and a cassette.

[0007]

To achieve this object, a magnetic recording / reproducing apparatus according to the present invention comprises a rotating cylinder having a magnetic head, a first base on which the rotating cylinder is mounted, and a reel on which a magnetic tape is wound. A tape guide post that pulls out a magnetic tape from a cassette with a built-in tape and winds it around a rotating cylinder at a specified angle A second base, a planetary gear that is provided with a base drive shaft at an eccentric position and revolves while meshing with an internal gear formed on the first base, and a sun located at the center of the planetary gear meshing with the internal gear. A gear, a mode switch that rotates in conjunction with the orbital motion of the planetary gear, and a driver that applies rotational force to the sun gear And a cam groove formed so as to correspond to a locus drawn by the base drive shaft after loading on the second base, and a rotatable shaft about a rotary support shaft provided on the second base. A pinch arm for rotatably holding a pinch roller, and a rotating support shaft on the second base, one of which is engaged with the pinch arm via a pinch crimp spring, and the other is formed on a mode switch. A pinch pressure lever that contacts the projection and applies a pinch pressure to the pinch roller;

[0008]

With this configuration, the pinch crimping mechanism can be greatly simplified, and the depth of the apparatus can be set to a size determined by the cassette and the rotating cylinder.

[0009]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

First, the tape loading means will be described. FIG. 1 is a plan view showing the external appearance of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view of a mechanism of the apparatus. In FIG. 2, reference numeral 2 denotes a rotary cylinder, on which a magnetic tape 4 pulled out of a cassette 1 mounted on a magnetic recording / reproducing apparatus is wound around an outer peripheral surface over a range of 331.5 °. This rotating cylinder 2 has
A set of four magnetic heads 3a, 3b, 3c, 3d has the tips slightly projecting to the outer periphery of the rotary cylinder 2, and 90
° divided and arranged on the circumference. A T-post base having a tape guide post 5b and an inclined post 6b for winding the magnetic tape 4 drawn from the cassette 1 around the outer peripheral surface of the rotary cylinder 2 counterclockwise along the loading guide 8 is provided below the rotary cylinder 2. It is provided movably. FIG. 3 shows a loading mechanism of the T post base.
A T-post base gear 9 formed of a part of the internal gear is attached to the T-post base 7 with a slight play at a lower part of the gear. Further, the loading gears 11 to 14 rotatably provided on the first base 10 are arranged on the circumference so as to mesh with the T post base gear 9 in order. Further, a loading ring 28 that meshes with all of the loading gears 11 to 14 is rotatably provided below the rotary cylinder 2 by the roller 15. Loading gear 14
Is configured to mesh with a rack 16a formed on the second base 16 holding the cassette 1 via a transmission gear 17, and when the tape loading is completed, the transmission gear 17 is moved from the rack 16a to the T. The meshing is transferred to the post-base crimping gear 18 and the crimping force is applied to the T-post base 7 by the T-post base crimping spring 19.

FIG. 4 shows a mechanism for slidingly moving the second base 16. Reference numeral 20 denotes an internal gear formed on the first base 10, reference numeral 21 denotes a sun gear rotatably provided coaxially with the internal gear 20, reference numeral 22 denotes the internal gear 20, sun gear 2.
1 is a planetary gear that meshes with the planetary gear mechanism 1.
The sun gear 21 has reduction gears 23 to 25 and a transmission gear 26.
, And is driven by the loading motor 27 via the. A base drive shaft 29 is erected on the planet gear 22 at an eccentric position. This base drive shaft 2
Reference numeral 9 corresponds to a cam groove 16b formed in the second base 16, and the trajectory 2 of the base drive shaft 29 when the planetary gear 22 is revolved in the direction of arrow A by the rotation of the sun gear 21.
9a draws a cycloid curve. At this time, the ratio of the number of teeth between the sun gear 21 and the planetary gear 22 is 2: 1. The trajectory of the base drive shaft is formed in the direction of arrow B and then formed in the direction of arrow C. The cam groove 16b is shaped so as to match the shape of the trajectory formed in the direction of arrow C. .

FIG. 5 shows a mechanism for pulling out the tape guide posts 5c and 5d and the tension post 44.

In FIG. 5, reference numeral 30 denotes a T4 post arm which holds the tape guide post 5c and pulls out the magnetic tape 4 from the inside of the cassette 1 to the outside of the cassette 1 during tape loading. It is provided rotatably. Also, the T4 post arm 30
Is provided with a gear portion, and meshes with a gear portion of a T4 post arm drive gear 33 having a rotation shaft 32 on the first base 10. Also, T4 post arm drive gear 3
Guide pins 34 corresponding to the cam grooves 16c formed in the second base 16 are provided on the third base 3. A leaf spring 35 is mounted on the T4 post arm 30, and when the loading is completed, the leaf spring 35 is pressed in the direction of arrow B by a crimping pin 36 provided on the second base 16, and the T4 post arm 30 is pressed.
Is fixed at a predetermined position. Reference numeral 37 denotes a T5 post arm which holds the tape guide post 5d and has a rotating shaft 38 on the second base 16, and has a guide pin 39 corresponding to the cam groove 10a formed in the first base 10. I have. 4
Reference numeral 0 denotes a state in which the tension band 42 is wound around the drum portion 41 formed on the reel base, and the tape supply reel 79 shown in FIG.
Is a tension arm for controlling the tension of the magnetic tape 4 during recording and reproduction by applying a rotational load to the arm.
43 is a tension spring, and 44 is a tension post for detecting the tape tension. The tension arm 40 has a rotation shaft 45 on the second base 16 and a guide pin 46 corresponding to the cam groove 10b formed in the first base 10.

FIG. 6 shows a main part of a loading mechanism of the tape guide post 5a. In FIG. 6, 47
Is an S-post base for holding the tape guide post 5a and the inclined post 6a, and is fixed at a predetermined position by a V-stopper 48 provided on the first base 10. The S-post base 47 is connected to the rotation shaft 5 on the second base 16.
It is engaged by an S loading arm A49 that can rotate around zero. The S loading arm B51 has a cam groove corresponding to the base drive shaft 29 provided on the planetary gear 22, and is mounted so as to be rotatable about a rotation shaft 50. A force is applied to the S loading arm B51 and the S loading arm A49 in a direction to close each other by the S post base compression spring 52. An S-post base guide 53 provided on the second base 16 holds the S-post base 47 while the second base 16 slides on the first base.

FIG. 7 is a side view of the planetary gear mechanism. In the figure, reference numeral 56 denotes a mode switch, which has a rotation shaft 56a of the planetary gear 22 and a projection 56b for kicking a pinch pressure lever 57 described later. 54, 55 in the figure
Is a reduction gear, 58 is a planetary gear mechanism support plate, 59 is a reduction gear support plate, 60, 61, and 62 are gear rotation axes, 6
3 is a loading motor pinion gear.

FIG. 8 is a view seen from the side of the T post base 7 at the time of completion of the loading, and the two-dot chain line indicates the position of the bottom surface of the apparatus (the bottom surface of the first base 10). The T-post base gear 9 is mounted on the T-post base 7 with loading guide pins 64a and 64b with a backlash. The loading guide 8 indicated by a dashed line in the drawing is in a state of being sandwiched between the brim portion of the loading guide pin 64 and the T post base gear 9. The tape guide post 5b and the inclined post 6b are attached to the T-post base 7 while being suspended from above. The tape guide post 5a
Roller shaft 6 which is the rotation axis of guide roller 65
The upper and lower collars 68 and 67 of the tape 6 are press-fitted with the guide roller 65 interposed therebetween. A height adjusting screw 69 for adjusting the height is press-fitted into the roller shaft 66, and is engaged with a female screw portion formed on a boss 70 which is press-fitted and fixed to the T-post base 7. . Further, a slit 6 for a minus screw is provided on the head of the roller shaft 66 so that the head can be turned by a screwdriver when adjusting the height.
6a are formed. 76 is a tape guide post 5a
This is a locking screw for locking the post after height adjustment.

Next, the pinch crimping mechanism will be described. In FIG. 9, reference numeral 71 denotes a pinch roller for sandwiching the magnetic tape 4 in a capstan 72 and pressing the magnetic tape 4 at a predetermined speed by a capstan motor 73. Reference numeral 74 denotes a pinch arm for rotatably holding the pinch roller 71, and a rotation support shaft 75 on the second base 16.
have. Reference numeral 57 denotes a pinch crimp lever, which similarly has a rotation support shaft 77 on the second base 16, is rotated counterclockwise by a protrusion 56 b formed on the mode switch 56, and is rotated by a pinch crimp spring 78. The pinch roller 71 is configured to generate a pressing force.

Next, the tape path will be described. In FIG. 10, the magnetic tape 4 pulled out from the tape supply reel 79 is drawn out horizontally with respect to the cassette 1 until reaching the tension post 44, the impedance roller 80, the tape guide post 5a, and the inclined post 6a. The tape guide post 5a and the inclined post 6a are fixed on the first base 10 after the magnetic tape 4 is pulled out from the opening of the cassette 1, and the inclined post 6a is arranged in parallel with the rotary cylinder 2 in the axial direction. I have. The magnetic tape 4 wound around the rotary cylinder 2 descends along the lead surface formed on the rotary cylinder 2, passes through the inclined post 6b and the tape guide post 5b, and gradually rises to reach the tape guide post 5c. It returns to the tape height in the cassette 1. After that, the magnetic tape 4 is moved to the inclined post 6
The twist is corrected by c, and reaches the tape winding reel 81 in the cassette 1 via the capstan 72, the pinch roller 71, and the tape guide post 5d. Here, the tape guide post 5b and the inclined post 6b are arranged in parallel with the rotating cylinder 2 in the axial direction after the magnetic tape 4 is drawn out from the opening of the cassette 1.

FIGS. 11 and 12 show the reel drive mechanism and the main parts of the arrangement of the first base 10 and the second base 16. 82 is a supply reel table, and 83 is a take-up reel table. The rotation of the capstan motor 73 is transmitted to a supply reel table 82 or a take-up reel table 83 via a timing belt 84, a timing pulley 85, a center gear 86, and an idler gear 87. The second substrate 16 has a first substrate 10 for tape loading.
Guide grooves 16d, 16e for sliding movement on
16f are provided, and 10c, 10d, and 10e are guide pins provided on the first base 10. FIG. 12 is a schematic diagram showing the reel drive mechanism and the side surfaces of the first base 10 and the second base 16. In the second base 16, the parts of the supply reel base 82 and the take-up reel base 83 sink. The reel drive mechanism such as an idler gear is accommodated between the second base 16 and the first base 10. Thus, when the cassette 1 is taken out from the second base 16, the mechanism serves as a decorative plate for making the mechanism invisible from the outside.

The operation of the magnetic recording / reproducing apparatus configured as described above will be described with reference to FIGS.

First, the sliding operation of the second base 16 will be described. FIG. 13 is a plan view of the entire mechanism showing a state in which the cassette is moved out of the cabinet. In this state, when the cassette 1 indicated by the two-dot chain line is first mounted on the apparatus, the cassette mounting is detected by a detection switch (not shown) for detecting the cassette mounting, and the loading motor 27 rotates. As a result, the sun gear 21 rotates counterclockwise via the reduction gears 23, 54, 24, 55, 25 and the transmission gear 26, and the planetary gear 22 revolves around the sun gear 21. FIG. 14 is a diagram illustrating a main part of a mechanism that drives the planetary gear 22. In the drawing, the planetary gear 22 is at a position 22A when the cassette is mounted, and moves with the rotation of the sun gear 21 through 22B to 22C. At this time, the base drive shaft 29 follows the trajectory 29a of the base drive shaft 29,
Is moved from the position 22A to the position 22B, the second base 16 is slid in the direction of arrow B by the cam groove 16b.

Next, the loading operation of the T-post base 7 will be described with reference to FIGS. 3, 15, 16, and 17. FIG. The sliding movement of the second base 16 rotates the transmission gear 17 meshing with the rack portion 16a formed on the second base 16, and transmits the rotation to the loading gear 14 meshing with the T-post base gear 9 (FIG. 14). checking). Further, since the rotation of the loading gear 14 is transmitted to the other loading gears 11, 12, and 13 by the loading ring 28, the T post base 7 separates the loading gears 14, 13, and 1 from each other.
The paper is sent out along the loading guide 8 in the order of 2,11. Here, loading guide 8 is T
As the post base 7 is sent out of the cassette,
It is formed to sink (see FIG. 17)
T post base gear 9 and loading gears 11-1
The meshing operation with 4 is performed three-dimensionally.
As shown in FIGS. 15 and 16, during the loading process, the tape guide post 5b of the T-post base 7 protrudes from the first base 10, but thereafter the loading formed on the first base 10 as shown in FIG. The loading guide pin 64a is guided by the cam portion 16f of the guide and is housed inside the first base 10. As a result, when the loading is completed, no mechanism is arranged at the rear of the rotary cylinder 2 so that the depth of the apparatus can be reduced (see FIG. 1). At this time, the portion where the T post base gear 9 is attached to the T post base 7 is accommodated in the lower part of the rotary cylinder 2.

FIG. 20 shows an arrangement of the T5 post arm 37, the T4 post arm 30, and the tension arm 40 at the time of unloading.

The tension arm 40 is at the position shown in FIG. 19 when the cassette 1 is mounted. During the sliding movement of the second base 16, the counter arm is counterclockwise by the guide pin 46 and the cam groove 10 b formed in the first base 10. Rotate in the direction. Similarly T
The 5-post arm 37 is also rotated clockwise by the guide pin 39 and the cam groove 10a. The T4 post arm 30 has a guide pin 39 corresponding to the guide groove 16c formed in the second base 16, and the T4 post arm drive gear 3
3 to rotate clockwise around the rotation shaft 31,
A leaf spring 35 attached to the post arm 30 is pressed by a pressure pin 36 provided on the second base 16 and fixed at a predetermined position.

Next, the loading operation of the S post base 47 will be described with reference to FIGS. During the sliding movement of the second base 16, the S-post base 47 is held by the S-post base guide 53, as shown in FIG.
Rotates, and the base drive shaft 29 moves in the direction of arrow C. As a result, the S loading arm B51 points to the arrow D (FIG. 1).
8), the S loading arm A49 also rotates about the rotation shaft 50. Thereby S
The post base 47 moves from the S post base guide 53 to the V stopper 48, and then the S post base 47
Are fixed at predetermined positions shown in FIG.

Next, the pressing operation of the pinch roller will be described with reference to FIGS. After the loading of the S-post base 47 is completed, the planetary gear 22 further rotates, and the projection 56b of the mode switch 56 arranged so as to interlock with the revolving motion of the planetary gear 22 kicks the pinch pressure lever 57. As a result, the pinch roller 71 is pressed against the capstan 72, and the apparatus enters a recording / reproducing mode. At this point, the loading motor 27 stops.

[0027]

As described above, according to the present invention, a magnetic tape is drawn out of a cassette having a rotating cylinder having a magnetic head, a first base on which the rotating cylinder is mounted, and a reel having a magnetic tape wound thereon. A tape guide post that winds a predetermined angle around the rotating cylinder, and a second base that holds the cassette and performs the operation of winding the tape guide post around the rotating cylinder at a predetermined angle, and at the same time, transfers the tape in the direction of the rotating cylinder. A planetary gear that is provided with a base drive shaft and revolves while meshing with an internal gear formed on the first base, a sun gear that meshes with the planetary gear and is located at the center of the internal gear, and interlocks with the revolving motion of the planetary gear. A rotating mode switch, a driving means for applying a rotating force to the sun gear, and a base after loading is completed on the second base A cam groove formed to correspond to the locus drawn by the moving shaft, a pinch arm rotatable around a rotation support shaft provided on the second base and rotatably holding a pinch roller, A rotating support shaft is provided on the second base, one of which is engaged with the pinch arm via a pinch pressing spring, and the other is brought into contact with a projection formed on the mode switch to apply a pinch pressing force to the pinch roller. By providing a pinch crimping lever that performs an additional function, the number of components of the pinch crimping mechanism can be greatly reduced, and the depth of the device can be designed to be the minimum size determined by the cassette and the rotating cylinder. As a result, an excellent magnetic recording / reproducing apparatus that achieves weight reduction, thinning, and cost reduction of the apparatus can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of the magnetic recording / reproducing apparatus according to an embodiment of the present invention when loading is completed.

FIG. 3 is a plan view of a T post-based loading mechanism of the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 4 is a plan view of a slide moving mechanism of a second base of the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 5 is a plan view of the magnetic recording / reproducing apparatus according to one embodiment of the present invention when loading of the tension arm and the tape guide post is completed.

FIG. 6 is a plan view of an S-post-based loading mechanism of the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 7 is a side view of a planetary gear mechanism of the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 8 is a side view of a T post base of the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 9 is a plan view of a pinch crimping mechanism of the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 10 is a plan view of a tape running path of the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 11 is a plan view of a reel drive mechanism of the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 12 is a schematic side view of a second base and a reel driving mechanism of the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 13 is a plan view showing a state in which the second base has been moved out of the cabinet in the magnetic recording / reproducing apparatus according to one embodiment of the present invention;

FIG. 14 is a plan view for explaining the operation of the planetary gear mechanism of the magnetic recording / reproducing apparatus in the same embodiment.

FIG. 15 is a plan view for explaining the operation of the T-post base loading mechanism of the magnetic recording / reproducing apparatus in the same embodiment.

FIG. 16 is a plan view for explaining the operation of the T-post base loading mechanism of the magnetic recording / reproducing apparatus in the same embodiment.

FIG. 17 is a plan view for explaining the operation of the T-post base loading mechanism of the magnetic recording and reproducing apparatus in the same embodiment.

FIG. 18 is a perspective view for explaining the operation of a T-post base loading mechanism of the magnetic recording / reproducing apparatus in the same embodiment.

FIG. 19 is a plan view for explaining the operation of the S-post base loading mechanism of the magnetic recording and reproducing apparatus in the same embodiment.

FIG. 20 is a plan view for explaining operations of a tension arm, a T4 post arm, and a T5 post arm of the magnetic recording / reproducing apparatus in the same embodiment.

FIG. 21 is a schematic diagram of a conventional magnetic recording / reproducing apparatus.

[Description of Signs] 1 cassette 2 rotary cylinder 5 tape guide post 10a cam groove 10b cam groove 16b cam groove 16c cam groove 75 rotation support shaft 77 rotation support shaft

Claims (1)

(57) [Claims] 1. A rotary cylinder having a magnetic head, a first base on which the rotary cylinder is mounted, and a magnetic tape drawn out of a cassette containing a reel on which a magnetic tape is wound, the magnetic tape being drawn out of the cassette and being fixed to the rotary cylinder. An angle-winding tape guide post, and a second substrate that holds the cassette and performs the operation of winding the tape guide post around the rotating cylinder at a predetermined angle, and at the same time, transfers the tape in the direction of the rotating cylinder. A planetary gear provided with a base drive shaft and revolving while meshing with an internal gear formed on the first base; a sun gear meshing with the planetary gear and located at the center of the internal gear; and a revolving motion of the planetary gear A mode switch that rotates in conjunction with the drive unit, a driving unit that applies a rotational force to the sun gear, A cam groove formed so as to correspond to a locus drawn by the base drive shaft after loading is completed on the board, and a pinch roller rotatable around a rotation support shaft provided on the second base. A pinch arm for rotatably holding, a pivot shaft on the second base, one of which is engaged with the pinch arm via a pinch crimp spring, and the other is formed on the mode switch. A pinch pressure lever which contacts the protrusions and applies a pinch pressure force to the pinch roller.