JPS624928Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device configured to increase the winding torque during fast forwarding of a tape with a simple configuration.

In conventional magnetic recording and playback devices, the tape is fast-forwarded by separating the magnetic head and pinch roller from the tape, thereby releasing the pinch roller's pressure on the tape to the capstan, and feeding the tape at a higher speed than during playback. The method of sending is adopted.

Although this method has the advantage of simplifying the tape drive mechanism, even if an attempt was made to add a function to find the beginning of a song by pressing the magnetic head against the tape during fast forwarding, the winding torque would be insufficient and it would not be practical. Ta. In other words, when the magnetic head is pressed against the tape during fast forwarding, a larger winding torque is required than during play, but with the above-mentioned method, the same drive mechanism is used during play and fast forward, so the torque is insufficient. Become. One possible solution to this torque shortage is to increase the winding torque during play, but increasing the winding torque during play more than necessary is not a preferable method as it will adversely affect wow and flutter.

Therefore, the present invention was devised in view of this point.
To provide a magnetic recording and reproducing device configured to increase winding torque only during fast forwarding using a simple mechanism.

Embodiments of the present invention will be described below with reference to the drawings. The magnetic recording and playback device shown in the drawing is for microcassettes.
1 is a flywheel to which the driving force of a motor 2 is transmitted via a rubber belt 3;
A large diameter gear 5 and a small diameter gear 6 are inserted through and concentrically.
are integrally formed. 7 is the take-up reel shaft;
A winding gear 9 is connected to the small diameter gear 6 of the flywheel 1 via a transmission gear 8 and is constantly driven.
, a reel spindle 11 that is engaged with the reel of the cassette 10, and a friction member 1 such as felt that transmits the rotation of the take-up gear 9 to the reel spindle 11.
One end of leaf springs 14 and 15 whose central portions are rotatably mounted on chassis shafts 13 and 13 is brought into contact with the lower end of the winding gear 9, and the leaf spring 1
4 and 15, the winding gear 9 is pressed against the reel spindle 11 to generate winding torque. The leaf spring 14 acts both during play and during fast forwarding, and the leaf spring 15 is controlled by a fast forwarding/rewinding control lever, which will be described later, so that it acts only during fast forwarding, and the winding torque of the take-up reel shaft 7 is varied. There is. Reference numeral 16 denotes a supply reel shaft, which includes a rewind gear 17 connected to the large diameter gear 5 of the flywheel 1 and constantly driven, a reel spindle 18 engaged with the reel of the cassette 10, and a rewind gear 1.
7 to the reel spindle 18, and the lower end of the rewinding gear 17 has a central portion connected to the chassis shafts 20, 20.
One end of a leaf spring 21 rotatably attached to the tape is brought into contact with the rewind gear 17, and the rewind gear 17 is pressed against the reel spindle 18 by the pressure of the leaf spring 21, thereby rewinding the tape.

Reference numeral 22 denotes a fast forward/rewind control lever, which is mounted so that guide shafts 23, 23 are housed in elongated holes 24, 24 so as to be slidable in the left and right direction, and is normally held at the center position by a spring 25.

The other ends of the play leaf spring 14, the fast-forward leaf spring 15, and the rewind leaf spring 21 are brought into contact with the back surface of the fast-forward/rewind control lever 22, and the leaf springs 14, 15, 21 Cam members 26, 27, and 28 are formed to rotate the. Reference numeral 29 denotes a pinch roller control lever that is slid in the vertical direction by operating the fast forward/rewind control lever 22. Guide shafts 30, 30 are housed in elongated holes 31, 31, and the pinch roller control lever is mounted so as to be slidable in the vertical direction. At the same time, a protruding shaft 32 implanted at one end is brought into contact with the cam side 33 of the fast forward/rewind control lever 22 formed in a V shape, and the other end is pressed against the capstan shaft 4 by a pinch roller 3.
It faces the position where it engages with the protrusion 36 of the pinch lever 35 supporting the pinch lever 4.

Reference numeral 37 denotes a locking bar that is slidable in the vertical direction and is biased downward by a spring 38, and is attached at one end to the fast forward/rewind control lever 22, and at the other end to be attracted to an electromagnet 39. The suction element 40 is fixed. Reference numeral 41 denotes a switch that disables an electronic governor circuit of a motor control circuit (not shown), and is configured to be closed when the fast forward/rewind control lever 22 is operated in the right direction. 4
2 is a magnetic head.

Next, the operation of the present invention having such a configuration will be explained.

First, in the play state shown in the drawing, the cam member 26 formed on the fast forward/rewind control lever 22 is in the fifth position.
Press the leaf spring 14 for play as shown in the figure,
In FIG. 2, by rotating the leaf spring 14 counterclockwise, the take-up gear 9 is pressed upward, and the rotation of the take-up gear 9 is transmitted to the reel spindle 11 via the friction member 12, thereby tapering the tape. Wind up.
At this time, the leaf spring 21 connected to the supply reel shaft 16
is spaced apart from the cam member 28 as shown in FIG.

Next, when the fast forward/rewind control lever 22 is operated in the right direction to enter the fast forward state, the cam member 2
7 engages with the fast forwarding leaf spring 15 and rotates the leaf spring 15 counterclockwise in FIG. A stronger winding torque than usual is applied to the reel spindle 11. When the fast forward/rewind lever 22 is operated, the pinch roller control lever 29 is slid upward by the V-shaped cam side 33, and the pinch lever 35 is rotated clockwise to release the pinch roller 34 from the capstan 4. ,
Closing the switch 41 shuts off the electronic governor of the motor 2, causing the motor 2 to rotate at a higher speed than during play and winding the tape onto the take-up reel shaft 9 at high speed. At this time, the fast forward/rewind control lever 22
, one end of the locking lever 37 is engaged with the engagement stepped portion 43, thereby preventing a return to the left direction and maintaining the fast forwarding state. Since the magnetic head 42 is in pressure contact with the tape even in the fast-forward state, when the playback signal from the magnetic head 42 disappears, that is, when a song interval is detected, the locking lever 37 is held by suction. If the electromagnet 39 is configured to be de-energized, the fast-forward/rewind control lever 22 is returned to the center position by the force of the spring 25 and returns to the play state. In this way, the beginning of the song can be found.

Next, when the fast forward/rewind control lever 22 is slid to the left to perform rewinding, the cam member 2
8 presses the leaf spring 21, the rewinding gear 17 is pressed upward, and the rotation of the rewinding gear 17 is transmitted to the reel spindle 18. At the same time, the pinch roller control lever 29 and the locking lever 37 are operated in the same manner as described above, and further, by moving the fast forward/rewind control lever 22 to the left, the engagement between the play leaf spring 14 and the cam member 26 is released. Winding gear 9
By releasing the connection between the reel spindle 11 and the reel spindle 11, the tape is rewound onto the supply reel shaft 16 at high speed. In this case as well, the beginning of the song can be found in the same way as in the case of fast forwarding.

As mentioned above, the magnetic recording and reproducing device of the present invention uses two types of leaf springs that apply winding torque to the winding shaft: a leaf spring that is applied during both play and fast forwarding, and a leaf spring that is applied only during fast forwarding. By measuring the increase in winding torque during fast forwarding, it is possible to perform fast forwarding with the magnetic head pressed against the tape in magnetic recording and reproducing devices that perform play drive and fast forward drive using the same drive mechanism. With this, it is possible to achieve the function of finding the beginning of a song, and it has an extremely practical effect.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of the magnetic recording and reproducing device of the present invention, Fig. 2 is a side view, Fig. 3 is a plan view showing the tape drive mechanism, and Figs. 4 and 5 show the main parts. FIG. 2...Motor, 7...Take-up reel shaft, 10...
...Cassette, 14, 15, 21...Plate spring, 16
...Supply reel shaft, 22...Fast forward/rewind control lever, 26, 27, 28...Cam member, 29...
...Pinch roller control lever, 34...Pinch roller, 37...Lock lever, 39...Electromagnet,
42...Magnetic head.

Claims (1)

[Scope of utility model registration request] The leaf spring that applies winding torque to the take-up reel shaft is composed of two leaf springs: one that acts to apply winding torque both during play and during fast forwarding, and one that acts to apply winding torque only during fast forwarding. The magnetic recording and reproducing device is characterized in that during fast forwarding, the winding torque is increased by the action of the two leaf springs compared to during play.