JP2600540B2 - 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 magnetic head, in which a magnetic tape is wound around a rotary head cylinder, and the magnetic head is slid to contact the magnetic head. And a magnetic recording and reproducing apparatus such as a video tape recorder.

[0002]

2. Description of the Related Art In recent years, magnetic recording / reproducing apparatuses such as cassette type video tape recorders have been reduced in size and weight.
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. 104a and 104b are tape guide posts, which are arranged 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 arrows. The tape is loaded by the loading ring 111 along the path indicated by, and is fixed at a predetermined position. further,
In conjunction with this, the cassette 101 becomes a rotating cylinder 102
, And is fixed at a predetermined position. 105
Reference numerals a and 105b denote inclined posts.
a 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 moving the magnetic tape 110 at a predetermined speed.
08, the magnetic tape 110 is moved to the capstan 106.
By pressurizing the magnetic tape 110, the rotational force of the capstan 106 is transmitted to the magnetic tape 110, and the magnetic tape 110 is transported at a predetermined speed.

[0004]

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 dimension becomes large in the depth of the mechanism by that much, 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 it is an object of the present invention to further reduce the size of a VTR which is determined by the size of a rotary cylinder and a cassette.

[0006]

In order to achieve this object, a magnetic recording / reproducing apparatus according to the present invention is arranged such that a magnetic tape is pulled out of a cassette containing a reel on which a magnetic tape is wound and is installed outside the cassette. A magnetic recording / reproducing apparatus configured to record or reproduce a signal by running in contact with a rotating cylinder, wherein a magnetic tape is drawn out of the cassette to the outside of the cassette and along a lead formed on the rotating cylinder. A guide roller that winds the magnetic tape around the rotating cylinder counterclockwise with respect to the rotating cylinder, a roller shaft that is the rotation axis of the guide roller and has a screw head at one end for adjusting the height of the guide roller, and a roller shaft Pressure is applied to the roller shaft 66 above and below the formed height adjustment screw and guide roller. And a boss having a screw portion that holds the roller shaft without looseness and meshes with the height adjustment screw, and a T-post base that holds the boss so that the guide roller can be hooked. doing.

[0007]

With this configuration, the depth of the apparatus can be set to the size determined by the cassette and the rotary cylinder, and the apparatus can be made thinner.

[0008]

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 showing a mechanism of the apparatus. In FIG. 2, reference numeral 2 denotes a rotary cylinder, and a magnetic tape 4 pulled out from a cassette 1 mounted on a magnetic recording / reproducing apparatus has an outer peripheral surface of 331.5.
It is wound over the range of °. A set of four magnetic heads 3a, 3b, 3c, 3
d slightly protrudes the tip from the outer periphery of the rotary cylinder 2 and is arranged on the circumference in a 90-degree division. A T-post base 7 having a tape guide post 5b for winding the magnetic tape 4 pulled out from the cassette 1 around the outer peripheral surface of the rotary cylinder 2 from the counterclockwise direction and a T-post base 7 having an inclined post 6b is provided at a lower portion of the rotary cylinder 2 for the loading guide 8. It is provided movably along it. FIG. 3 shows a T post-based loading mechanism.
At the lower part of the post base 7, a T formed by a part of the internal gear
The post base gear 9 is attached to the T post base 7 with some play. 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. The loading gear 14 is provided with a second base 16 for holding the cassette 1.
In the state where the tape loading is completed, the transmission gear 17 shifts from the rack portion 16a to the T post base crimping gear 18 and engages with the T post base crimping gear 18. The crimping spring 19 is configured so that a crimping force acts on the T-post base 7.

FIG. 4 shows a mechanism for sliding 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, and reference numeral 22 denotes an internal gear 20 sun gear 21.
And a planetary gear that constitutes a planetary gear mechanism. The sun gear 21 is configured to be driven by a loading motor 27 via reduction gears 23 to 25 and a transmission gear 26. A base drive shaft 29 is erected on the planetary gear 22 at an eccentric position. The base drive shaft 29 corresponds to the cam groove 16b formed in the second base 16, and the trajectory 29a 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. Will draw 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 29a of the base drive shaft is first formed in the direction of arrow B and then formed in the direction of arrow C.
b is taken so as to match the locus shape formed in the arrow C direction.

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. T4 post arm drive gear 33
A guide pin 34 corresponding to a cam groove 16C formed on the second base 16 is provided above. A leaf spring 35 is mounted on the T4 post arm 30, and when the loading is completed, the crimping pin 3 provided on the second base 16 is mounted.
T4 post arm 30 pressed in the direction of arrow B at 6
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. ing.
40, a tension band 42 is wound around a drum portion 41 formed on a reel base, and the tape supply reel 7 shown in FIG.
9 is a tension arm for controlling the tension of the magnetic tape 4 during recording and reproduction by applying a rotational load to the magnetic tape 9. 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,
It has 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 around the rotation shaft 50. This S loading arm B51 and S
A force is applied to the loading arm A49 in a direction to close each other by the S-post base compression spring 52. 53 is an S-post base guide provided on the second base 16.

FIG. 7 is a side view of the planetary gear mechanism. In the figure, reference numeral 56 denotes a mode switch, which is a rotation shaft 56a of the planetary gear 22 and a pinch pressing lever 57 described later.
And a protruding portion 56b for kicking. 54, 5 in the figure
5 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,
63 is a loading motor pinion gear.

FIG. 8 is a view showing the side surface of the T post base 7 at the time when the loading is completed, 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 attached to the T-post base 7 in a state where the loading guide pins 64a and 64b have rattling. 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. Tape guide post 5b and inclined post 6
b is attached to the T-post base 7 in a state of being suspended from above. The tape guide post 5 a has a configuration in which an upper flange 68 and a lower collar 67 of the tape are pressed into a roller shaft 66 which is a rotation axis of the guide roller 65 with the guide roller 65 interposed therebetween. Also, this roller shaft 6
A height adjusting screw 69 for height adjustment is press-fitted into 6, and is engaged with a female screw portion formed on a boss 70 press-fitted and fixed to the T-post base 7. Further, a slit 66a for a minus screw is formed in the head of the roller shaft 66 so that the roller can be turned by a screwdriver when adjusting the height. Reference numeral 76 denotes a locking screw for locking the post after the height of the tape guide post 5a has been adjusted.

Next, the pinch crimping mechanism will be described. In FIG. 9, reference numeral 71 denotes a pinch roller for sandwiching and pressing the magnetic tape 4 on a capstan 72 and driving the magnetic tape 4 at a predetermined speed by a capstan motor 73. Reference numeral 74 denotes a pinch arm that rotatably holds the pinch roller 71, and the rotation support shaft 7 on the second base 16.
Five. 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 projection 56 b formed on the mode switch 56, and is pinched by a pinch crimp spring 78. The 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 disposed in parallel with the rotary cylinder 2 in the axial direction. I have. The magnetic tape 4 wound around the rotating cylinder 2 descends along the lead surface formed on the rotating cylinder 2, and after moving down the inclined post 6b and the tape guide post 5b, gradually ascends to the tape guide post 5c. And returns to the height of the tape in the cassette 1. Thereafter, the magnetic tape 4 is subjected to the twist correction by the inclined post 6c, and reaches the tape take-up reel 81 in the cassette 1 through the capstan 72, the pinch roller 71, and the tape guide 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 pulled out from the opening of the cassette 1.

FIGS. 11 and 12 show the reel drive mechanism and 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 the supply reel table 82 or the take-up reel table 83 via the timing belt 84, the timing pulley 85, the center gear 86, and the idler gear 87. Second base 1
6 is provided with guide grooves 16d, 16e, 16f for sliding movement on the first base 10 during tape loading, and 10c, 10d, 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 are sunk. The reel driving 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 the drawings.

First, the sliding operation of the second base 16 will be described. FIG. 13 is a plan view of the entire mechanism section showing a state where the cassette is moved out of the cabinet.
In this state, when the cassette 1 is first mounted on the apparatus as shown by a two-dot chain line, the mounting of the cassette is detected by a detection switch (not shown) for detecting the mounting of the cassette, 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 figure, the planetary gear 22 is at the position 22A in FIG.
Move through 2B to 22C. At this time, the base drive shaft 2
9 follows the locus 29a of the base drive shaft 29. While the planetary gear 22 moves from the position 22A to the position 22B, the second base 16 slides in the direction of arrow B by its 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 16 a formed on the second base 16, and the rotation is transmitted to the loading gear 14 meshing with the T-post base gear 9.
(See FIG. 14) Further, the loading gear 14
Is transmitted to the other loading gears 11, 12, and 13 by the loading ring 28.
The post base 7 includes the loading gears 14, 13, 1
The paper is sent out along the loading guide 8 in the order of 2,11. Here, loading guide 8 is T
The post base 7 is formed to sink as the post base 7 is sent out of the cassette (see FIG. 17).
Post base gear 9 and loading gears 11-14
Is performed three-dimensionally. In the loading process, as shown in FIGS.
The tape guide post 5b of the post base 7 protrudes from the first base 10, but thereafter, as shown in FIG. 2, the cam 16 of the loading guide formed on the first base 10.
The loading guide pin 64a is guided by f, and the first base is accommodated inside the 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. 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 the arrangement of the T5 post arm 37, the T4 post arm 30, and the tension arm 40 during 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 a T4 post arm drive gear 33.
As a result, the plate spring 35 attached to the T4 post arm 30 is fixed in place by applying a pressing force by a pressing pin 36 provided on the second base 16. Is done.

Next, the loading operation of the S post base 47 will be described with reference to FIGS. After the slide movement of the second base 16 is completed, the sun gear 21 further rotates, and the base drive shaft 29 moves in the direction of arrow C. As a result, the S loading arm B51 moves to the arrow D
18 (see FIG. 18), the S loading arm A49 also rotates about the rotation shaft 50. afterwards,
The S post base 47 is fixed at a predetermined position shown in FIG. 5, and a pressing force is applied by an S board pressing spring 52.

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.

[0026]

As described above, according to the present invention, a magnetic tape is pulled out of a cassette containing a reel on which a magnetic tape is wound, and is run while being attached to a rotary cylinder installed outside the cassette. A magnetic recording / reproducing apparatus configured to record or reproduce a magnetic tape, wherein the magnetic tape is pulled out of the cassette from the inside of the cassette, and the magnetic tape is rotated counterclockwise with respect to the rotating cylinder along a lead formed on the rotating cylinder. Roller around the rotary cylinder, a roller shaft which is a rotating shaft of the guide roller and has a screw head at one end for adjusting the height of the guide roller, a height adjusting screw portion formed on the roller shaft, and a guide. Upper and lower collars pressed into and fixed to the roller shaft above and below the roller, and the roller A boss forming a threaded portion meshing with snugly held height adjusting screws Yafuto, and a T post base to hold the boss so that the guide rollers fishing lowered. When the rotary cylinder is inserted into the cassette opening and the depth of the device is designed to be the minimum size determined by the cassette and the rotary cylinder, the tape guide post that is always counterclockwise wound on the rotary cylinder sinks into the device. The problem that the embedding device becomes thick can be solved. Therefore, it is possible to realize an excellent magnetic recording / reproducing apparatus which achieves a reduction in the thickness of the apparatus.

[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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cassette 2 Rotating cylinder 5 Tape guide post 10a, 10b, 16b, 16c Cam groove 75, 77 Rotation support shaft

Claims (1)

(57) [Claims] 1. A system in which a magnetic tape is drawn out of a cassette containing a reel on which a magnetic tape is wound, and the magnetic tape is run while being attached to a rotary cylinder installed outside the cassette to record or reproduce a signal. A magnetic recording / reproducing apparatus, wherein the magnetic tape is pulled out of the cassette to the outside of the cassette, and the magnetic tape is rotated counterclockwise with respect to the rotary cylinder along a lead formed on the rotary cylinder. A guide roller wound around a rotating cylinder, a roller shaft that is a rotation axis of the guide roller and has a screw head at one end for adjusting the height of the guide roller, and a height adjustment screw portion formed on the roller shaft. , And upper and lower press-fitted and fixed to the roller shaft above and below the guide roller. A collar and a lower collar, a boss having a screw portion that holds the roller shaft without looseness and meshes with the height adjustment screw, and a T post base that holds the boss so that the guide roller catches the boss. A magnetic recording / reproducing apparatus.