JP2864028B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus that performs recording and reproduction by winding a magnetic tape around a rotating drum.

[Prior art] In a rotating head type video tape recorder (VTR), an operation of pulling out a tape from a cassette when recording and reproducing and winding the tape around a rotating drum (loading), and a process of winding the tape into the cassette when removing the cassette. The take-off operation (unloading) is performed, but in general, the tape is pulled out of the cassette by the pull-out post while giving an appropriate back torque to the reel so that tape damage does not occur at the time of loading. The draw-out post moves toward the original position while being wound up on one or both reels by a winding torque that does not cause the pull-out.

[Problems to be solved by the invention] However, in the conventional VTR, when loading,
When the drawer post reaches the final position at the end of loading and stops, the tape slacks out of the cassette due to the inertia of the reel hub in the cassette due to the relationship between the back torque, the moving speed of the post, and the tape winding diameter. there is a possibility.

In order to prevent this problem, it is only necessary to increase the back torque or slow down the moving speed of the post, but as a result the tape tension during loading increases,
The tape edge is bent by the flange of the post or the like, which may cause damage. There is also a problem that if the moving speed is reduced, the loading time becomes longer and the operability deteriorates.

An object of the present invention is to provide a magnetic recording / reproducing apparatus provided with a means for preventing the tape from sagging or damage and not prolonging the loading time.

Means for Solving the Problems To achieve the above object, a magnetic recording / reproducing apparatus of the present invention draws a tape from a cassette and winds the tape around a rotating drum equipped with a magnetic head to perform recording / reproducing. In a reproducing apparatus, a guide post for pulling out a tape, a mechanism for moving the guide post between a first position in the cassette opening and a second position where winding on the rotary drum is completed, and a cassette Means for rotating the inner reel, and when the guide post moves from the first position to the second position, a back torque of a predetermined magnitude is applied to the reel, and the guide post is moved to the second position. Immediately before the movement to the position is completed, a back torque larger than the predetermined magnitude of the back torque is applied to the reel.

[Operation] With the above configuration, the backing torque of the reel is increased immediately before loading is completed, thereby enabling a loading operation without a tape slack or damage.

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

FIG. 1 is a plan view showing the entire configuration of a tape loading section of a VTR according to an embodiment of the present invention, in which both the loading completed state and the state where the tape pull-out member is within the cassette opening by thin lines are shown. is there.

The loading method is a parallel M loading method in which the loading posts all move parallel to the chassis and the tape is wound substantially symmetrically about the drum.

In FIG. 1, reference numeral 1 denotes a cassette in which a supply reel 2 and a take-up roll 3 are accommodated, and a magnetic tape (hereinafter, referred to as a tape) 4 is wound between them.
5 is a vertical post on the supply side, 7 is a tape 4 to the rotating drum 6
The vertical post 5 and the tilt post 7 are set on a skate 8. 9
Is a vertical post on the take-up side, 10 is an inclined post for determining the exit angle from the rotary drum 6, and the vertical post 9 and the inclined post 10 are erected on a skate 11. Also skating
An arm 14 on which a pinch roller 13 is mounted is rotatably supported on the shaft 12, and a vertical post 15 is erected.
Numeral 16 denotes a tenregi post on the supply side, and a tenregi arm 17
Standing on top.

Now, the cassette 1 is mounted by a cassette mounting device (not shown).
Are mounted, these posts 5, 7, 9, 10, 15, 16 and the pinch roller 13 enter the opening 1a of the cassette 1.

Reference numeral 18 denotes a rail for determining the movement route of the skates 8, 11, and 12, and the ends of the three routes are respectively connected to catchers 19, 20, and 21 for determining the positions of the posts.

Reference numeral 22 denotes a loading motor, which transmits power to a loading ring 23 via a belt worm and a gear. 24,2
Reference numerals 5 and 26 denote photointerrupters for detecting an unloading position, an intermediate position, and a loading position, respectively. The detection members 27 attached to the loading ring 23 detect the positions by blocking their optical paths.

Reference numeral 28 denotes a pinch roller pressing mechanism, and the pinch roller 13 is moved by the operation of the solenoid 29 when the tape is running.
Pressed against.

In addition, on the mechanical chassis 31, a post 32, an impedance roller 33, a full width erase head 34, an audio CTL, each erase head 35 for time code, a recording / reproducing head 36,
Monitor head 37, post 38, winding end 3
9. The posts 40 are disposed at predetermined positions, either directly or via attachment members.

The supply and take-up reel bases 42 and 43 of the cassette 1 are rotationally controlled by independent reel motors.

Next, the loading operation, which is a feature of the present invention, will be described with reference to FIGS.

FIG. 2 is a diagram showing the timing of the torque change of the reel motor of the present invention, and FIG. 3 is a schematic block diagram showing the loading motor and the control unit of the reel motor of the present invention.

First, when the cassette 1 is mounted, when a cassette is detected by the cassette detection switch 44, a signal is first output from the system controller 45 to the reel motor control circuit 46 to energize the reel motor 47, and a predetermined back torque is applied. . Then a little later, the loading motor control circuit
Electricity is supplied to the loading motor 22 through 48, and the loading ring 23 starts rotating via a gear. Along with this, the skates 8, 11, 12 move along the grooves 18a, 18b, 18c of the rail 18, respectively, and the ten regi arm 17 rotates counterclockwise about the shaft 41, thereby causing the posts 5, 7, 9, 10 to rotate. , 15,16 pull the tape out of the cassette. At this time, as shown in FIG. 2, as little as possible back torque is applied to the reel motor 47 so that tape damage does not occur in the loading width regardless of the reel diameter.

When the loading progresses and the detection member 27 passes through the photo interrupter 25, a command is issued from the system controller 45 to the reel motor control circuit 46, the voltage applied to the reel motor 47 is increased, and the back torque is increased as shown in FIG. . On the other hand, the photo-interrupter 25 is located at a position where the position can be detected immediately before each post reaches the final position. At that time, the tape path is formed in a substantially final form, and the back torque And the tape and drum 6
No tape damage is caused by the lead.

Furthermore, the loading ring 23 rotates, and the skate 8,1
After the catchers 19, 20, and 21 have been positioned by the catchers 19, 20, 21, respectively, the loading ring 23 continues to rotate, and applies a charging force to the skates 8, 11, 12 by a spring (not shown). When the detection member 27 rotates to a position where it interrupts the optical path of the loading position detection photointerrupter 26, the loading motor is driven by a command from the system controller 45.
Loading to 22 is completed and the loading is completed.

Thus, the tape 4 becomes helical to the drum 6
When the tape is wound 180 ° + α ° and opened right and left by the ten leg post 16 and the post 15, it is also wound around a fixed head and other posts to form a tape path.

[Effects of the Invention] As described above, according to the present invention, a weak back torque is applied to a reel from the start of loading to immediately before completion, and the torque is increased immediately before the loading, so that the loading time can be reduced without delaying the loading time. Tape slack and tape damage can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing the overall structure of a tape loading section of a VTR according to one embodiment of the present invention, FIG. 2 is a diagram showing the timing of torque change of a reel motor of the present invention, and FIG. FIG. 3 is a schematic block diagram illustrating a control unit for the loading motor and the reel motor. In the figure. 1: Cassette 5, 9, 15: Vertical post 7, 10: Inclined post 8, 11, 12: Skate 22: Loading motor 23: Loading ring 24, 25, 26: Photo interrupter 27: Detection member 42: Supply side reel stand 43: Take-up reel base 45: System controller 46: Reel motor control circuit 47: Reel motor 48: Loading motor control circuit

Claims (1)

(57) [Claims] In a magnetic recording / reproducing apparatus for recording and reproducing a tape by pulling out a tape from a cassette and winding the tape around a rotating drum equipped with a magnetic head, a guide post for pulling out the tape and the guide post are inserted into a cassette opening. And a mechanism for rotating a reel in the cassette between a first position of the guide post and a second position after the winding of the guide post is completed. In moving to the second position, a predetermined amount of back torque is applied to the reel, and immediately before the guide post completes the movement to the second position, the back torque becomes smaller than the predetermined amount of back torque. A magnetic recording / reproducing apparatus, wherein a large back torque is applied to the reel.