JPH0610509Y2 - Moving mechanism of magnetic head - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mechanism for moving a magnetic head in a cassette deck to a play position, a cue position, and an eject position.

2. Description of the Related Art As a conventional mechanism of this kind, a system in which a magnetic head is moved in conjunction with a loading mechanism for inserting and ejecting a cassette pack, and an eject lever and a head advancing mechanism independent of the loading mechanism are used. A method in which an electromagnet is linked is known. However, the former method has a drawback that the loading mechanism and the magnetic head moving mechanism are complicated because the loading mechanism moves the magnetic head forward to the cueing position and moves to the play position by an electromagnet separately provided. In the latter method, the magnetic head is retracted to the eject position by the spring force by pushing the eject lever, so the eject lever is indispensable and the magnetic head can be moved to the eject position by operating the electrical eject switch. It has been difficult to realize a so-called feather touch for moving.

Therefore, the present inventor has previously devised a magnetic head moving mechanism that is compact and suitable for downsizing, and that allows feather touch.

7 to 9 are plan views of a main part of the magnetic head moving mechanism previously proposed by the present inventor. FIG. 7 shows a state in which the magnetic head is at the eject position, and FIG. FIG. 9 shows the state in which the magnetic head is in the play position, and FIG. 9 shows the state in which the magnetic head is in the cue position.

In each drawing, 1 is a chassis, on which a head frame 2, a head advance lever 5, a solenoid type electromagnet 7,
11, Cue lever 8 etc. are mounted. When a current is passed in a predetermined direction for a certain period of time, the solenoid type electromagnet 7 generates a magnetic force in a direction in which the movable iron core 7a is pulled in and holds the magnetic force even when the current is cut off, and a current is passed in a reaction direction for a certain period of time. Is a type of electromagnet whose magnetic force is erased, and the solenoid type electromagnet 11 has its movable iron core 11a when energized.
Is a type of electromagnet that generates a magnetic force that draws in the magnetic field and that erases the magnetic force when power is cut off. Further, the chassis 1 is provided with a hole 1f into which a gear 15 coupled to the hub drive shaft 12 is inserted, and a guide pin 14 or a cap inserted into a guide hole of a cassette pack (not shown) is provided at a predetermined position. Stan 13 is located.

The head mount 2 has a chassis 1 in the guide holes 2a and 2b.
Is loosely inserted, and guide pins 2e and 2f protruding toward the chassis 1 are loosely inserted into guide holes 1c and 1d of the chassis 1 to guide holes 2a, 2b and 1a.
It is mounted on the chassis 1 so as to be movable back and forth in the major axis directions of c and 1d. A convex portion 2i is formed on the lower surface of the head mount 2 in order to reduce sliding friction between the head mount 2 and the chassis 1. The magnetic head 3 is screwed to a predetermined position of the head mount 2 by a mounting tool 4. A retracting spring 9 is provided between the lower protrusion 2g of the head mount 2 and the protrusion 1g of the chassis 1.
The spring 9 gives a force for moving the head mount 2 upward (to the solenoid type electromagnet 7 side).

The head advancing lever 5 is rotatably supported on the chassis 1 by a shaft 5c, and one end thereof is rotatably attached to a movable iron core 7a of a solenoid type electromagnet 7 by a through hole 5c and a pin 7b. Post 5 on the other end of lever 5
d is erected, and the winding spring 6 is attached to this. Coil spring 6
Has one end locked to the folded-back portion 5b of the lever 5, and the other end locked to an arbitrary position of the lever 5. Also, the winding spring 6
Has a length that abuts on a pin 2c erected on the head mount 2.

The cueing lever 8 is rotatably supported by the chassis 1 on a shaft 8a, and a part of the portion on the left side of the shaft 8c has a cue positioning pin 8b that is erected on the end of the head 8a. It fits into the cue positioning hole 2d provided in the head mount 2 and is inserted under the head mount 2. In order to enable this insertion, the stepped portion 2 is provided at the substantially central portion of the head mount 2.
h is formed. There is a folded-back portion 8d on the right side of the lever 8 and a movable iron core of the solenoid type electromagnet 11 is provided there.
11a is installed. In order to enable the lever 8 to rotate about the shaft 8a, the movable iron core 11a is coupled to the through hole 8e formed in the folded portion 8d by the pin 11b. Further, one end of the winding spring 10 attached to the chassis 1 is locked to the folded-back portion 8c at the left end of the lever 8, and the other end is locked to the folded-back piece 1e of the chassis 1. The coil spring 10 gives a force to rotate the lever 8 clockwise about the shaft 8a.

FIG. 10 is a block diagram of an electrical configuration for controlling the drive of the solenoid type electromagnets 7 and 11, and 30 is a switch for detecting the completion of the insertion of the cassette pack. For example, the loading of the cassette pack is completed by a loading mechanism (not shown). When the hub hole of the cassette pack is
It turns on when it reaches a state where it fits into 12. Also, 31
Is a cueing switch provided on the front panel of the cassette deck, and 32 is an eject switch also provided on the front panel. The microcomputer 34 detects the states of these switches 30 to 32 and generates a signal for driving the solenoid type electromagnets 7 and 11 via the drivers 35 and 36. For example, as shown in FIG. Execute the process.

FIG. 12 shows the states of the switches 30 to 32 when the magnetic head moving mechanism is driven to move the magnetic head 3 from the eject position to the play position, the cue position, the play position, and the eject position in order, and the solenoid type electromagnet. It is a timing chart showing the states of the drive signals 7 and 11, and the operation will be described below with reference to the drawings.

[Ejecting state] See FIG. 7. When the cassette pack is discharged to the outside, the solenoid type electromagnet 7 is not excited, and the guide pin 1a of the head mount 2 is moved to the lower end of the guide hole 2a by the force of the retracting spring 9. It has risen to the abutting position. When the cassette pack is loaded, its upper end is at a position corresponding to the one-dot chain line ₁ , and the magnetic tape is at the position shown by the dotted line TP. That is, the magnetic head 3 is retracted to a position where it does not interfere with the loading of the cassette pack at the eject position. Also,
At this time, the solenoid type electromagnet 11 was not excited and the coil spring 10
Force is applied to the cue lever 8 in the clockwise direction, and the cue positioning pin 8b of the cue lever 8 contacts the right edge of the hole below the cue positioning hole 2d of the head mount 2. Touching.

[Movement from Eject Position to Play Position] See FIGS. 7 and 8. When loading of the cassette pack is completed by a loading mechanism (not shown), the loading completion detection switch 30 is turned on, and the microcomputer 34 causes the solenoid via the driver 35. The electromagnet 7 is excited by passing a current in the + direction for a predetermined time. When the electromagnet 7 is excited, its movable iron core 7a is pulled in, the head advancing lever 5 is rotated clockwise about the shaft 5c, and the pin 2c of the head mount 2 is pushed by the winding spring 6 to move the head mount. 2 moves downward against the force of the retracting spring 9 and stops at the position where the guide pin b of the chassis 1 abuts the upper end of the guide hole 2b of the head mount 2. This position is the play position, and the magnetic head 3 enters deeper than the upper end surface _{1 of the} cassette pack,
It is strongly pressed against TP. At this time, since the solenoid type electromagnet 11 is not excited and the indexing lever 8 is applied with the force in the clockwise direction by the coil spring 10, the indexing positioning pin 8b is located above the indexing positioning hole 2d. Is abutted against the right edge of.

It should be noted that the pin 5f projected on the lower surface of one end of the head advancing lever 5 moves an unillustrated advancing plate,
The hub drive system etc. switches to the play state.

[Movement from Play Position to Cue Position] FIGS. 8 and 9
See the figure. When the cueing switch 31 is pressed in the play state, the microcomputer 34 applies a current in the-direction for a predetermined time to the solenoid type electromagnet 7 to release its excitation. When the excitation of the electromagnet 7 is released, the head cradle 2 retreats upward by rotating the head advancing lever 5 due to the force of the retreat spring 9, but the indexing lever 8 is rotated clockwise by the winding spring 10. Since the moving force is applied and the cue positioning pin 8b is pressed against the edge of the cue positioning hole 2d, the pin 8b is moved to the hole 2
The head mount 2 stops at the position where it abuts on the stepped portion between the upper hole and the lower hole of d. This position is the cueing position, and the magnetic head 3 is inserted into the pack shallower than the upper end surface ₁ of the cassette pack and is abutted lightly on the magnetic tape TP. In this state, the tape running speed is switched to the fast-forward state by the pin 5f of the head advancing lever 5, and the microcomputer 34 finds the specified track in a known manner.

[Return to Play Position After Completion of Cue] See FIGS. 8 and 9. Upon completion of cueing, the microcomputer 34 energizes the solenoid type electromagnet 7 by applying a current in the + direction for a predetermined time. As a result, the head advance lever 5 is rotated clockwise, the pin 2c is pushed by the coil spring 6, and the head mount 2 is moved to the play position.

[Movement from play position to eject position] See Figs. 7 and 8. When the eject switch 32 is turned on, the microcomputer 34 applies a current in the-direction to the solenoid electromagnet 7 for a predetermined time to release its excitation. Also, the solenoid type electromagnet 11 is excited for a predetermined time. The movable iron core 11a is pulled in by the excitation of the electromagnet 11, and the indexing lever 8 rotates counterclockwise against the force of the winding spring 10 to index the indexing pin 8 for positioning.
The engagement between b and the stepped portion of the cue positioning hole 2d is released, and the head mount 2 is retracted upward by the force of the retracting spring 9 to be positioned at the eject position.

As described above, according to the moving mechanism as described above, the structure is simplified, and the magnetic head 3 can be moved to the eject position by the operation of lightly pressing the eject switch 32 which is an electrical switch. It is possible to obtain a magnetic head moving mechanism that is compact and can be easily made into a feather touch.

However, the above moving mechanism also has the following problems. That is, the state in which the magnetic head 3 is at the cueing position (9th
(See the drawing), the head mount 2 has a pin 8 for positioning the head.
It is stopped only by the frictional force between b and the stepped portion of the cue positioning hole 2d. When this frictional force is small, the pin 8b is disengaged from the stepped portion of the hole 2d by the force of the retracting spring 9, and the head mount 2 is It moves to the eject position. For this reason, when applied to a vehicle-mounted cassette deck with large vibration, etc., the engagement between the pin 8b and the stepped portion of the hole 2d is prevented from being disengaged by the impact of the vibration of the free movable iron cores 7a and 11a. It is necessary to increase the spring force of the coil spring 10 considerably. However, when the spring force of the coil spring 10 is increased, the pulling force of the solenoid-type electromagnet 11 needs to exceed it, which requires a high-power electromagnet, which is disadvantageous in terms of cost and space.

Problems to be Solved by the Invention The present invention solves such problems, and the locking force (stopping force) of the head mount 2 at the cueing position is
An object of the present invention is to improve the vibration resistance by increasing the spring force of the spiral spring 10 without increasing the spring force and without using a large electromagnet.

Means for Solving the Problems In order to solve the above problems, the present invention provides a moving mechanism for moving a magnetic head to a predetermined play position, cue position, and eject position, the magnetic head being mounted on the magnetic head. Head mount mounted on the chassis so as to move back and forth with respect to the moving direction, engaging means for stopping the head mount at the play position, engaging means for stopping the head mount at the eject position, and the head mount. Of the first electromagnet, which is rotatably supported on the chassis by a retracting spring for urging the first electromagnet toward the eject position, a first electromagnet that is excited during play and that is de-excited during cueing and ejecting. A head advance lever that is rotated by excitation to push the head mount in the play position direction, and a cue positioning pin provided at one end are provided in the head. A cueing lever pivotally supported on the chassis in a state of being inserted into a cueing positioning hole provided on a frame and a magnet which is excited only when cueing and is attached to the other end of the cueing lever. A second electromagnet for attracting the movable iron core and a force having a spring force smaller than that of the retreating spring and for rotating the indexing lever in a direction in which the movable iron core moves toward the fixed iron core of the second electromagnet. A spring is provided, and in the cue-out state, the cue-positioning pin is locked to the stepped portion of the cue-positioning hole.

Embodiment FIG. 1 to FIG. 3 are plan views of essential parts of an embodiment of the present invention.
FIG. 1 shows a state in which the magnetic head 3 is at the eject position.
FIG. 2 shows the state in which the magnetic head 3 is in the play position,
The figures respectively show a state in which the magnetic head 3 is at the indexing position. In FIGS. 1 to 3, the same reference numerals as those in FIGS. 7 to 9 indicate the same parts.

The structure shown in FIGS. 1 to 3 is different from the structure shown in FIGS. 7 to 9 in the following points.

(1) The step in the center of the cue positioning hole 2d of the head mount 2 is provided on the right side of the drawing in FIG.
In this embodiment, it is provided on the left side of the paper.

(2) The winding spring 10 of FIG. 7 gives a force for rotating the cueing lever 8 clockwise, but the winding spring 17 of this embodiment rotates the cueing lever 8 counterclockwise. Giving power. This is because the step of the indexing positioning hole 2d is provided on the opposite side. The force of the coil spring 17 is set to be sufficiently smaller than the force of the retracting spring 9.

(3) Instead of the solenoid type electromagnet 11 of FIG. 7, a clapper type electromagnet 16 is used, and its movable iron core 16a is attached to the folded portion 8d of the indexing lever 8.

FIG. 4 is a block diagram showing an example of the electrical configuration of this embodiment, and the same symbols as in FIG. 10 indicate the same parts. The block diagram is similar to that of FIG. 10, but the microcomputer 34
The processing carried out by is different, for example, as shown in FIG.

FIG. 6 drives the head moving mechanism of this embodiment to move the magnetic head 3 from the eject position to the play position, the cueing position,
It is a timing chart showing the states of the switches 30 to 32, the drive signals of the solenoid type electromagnet 7 and the clapper type electromagnet 16 when they are sequentially moved to the play position and the eject position. The operation of the example will be described.

[Ejecting state] See FIG. 1. When the cassette pack is discharged to the outside, the solenoid electromagnet 7 is not excited, and the guide pin 1a of the head mount 2 is moved to the lower end of the guide hole 2a by the force of the retracting spring 9. It has risen to the abutting position. When the cassette pack is loaded, its upper end is at a position corresponding to the one-dot chain line ₁ , and the magnetic tape is at the position shown by the dotted line TP. That is, the magnetic head 3 is retracted to a position where it does not interfere with the loading of the cassette pack at the eject position. Also,
At this time, the clapper type electromagnet 16 is not excited, and the cue lever 17 is given a counterclockwise force by the force of the coil spring 17, and the cue positioning pin 8b of the cue lever 8 is cueed to the couch 2 head. It abuts on the left edge of the hole below the positioning hole 2d.

[Movement from Eject Position to Play Position] See FIG. 1 and FIG. 2. When loading of the cassette pack is completed by the loading mechanism (not shown), the loading completion detection switch 30 is turned on, and the microcomputer 34 causes the solenoid via the driver 35. The electromagnet 7 is excited by passing a current in the + direction for a predetermined time. When the electromagnet 7 is excited, its movable iron core 7a is pulled in, the head advancing lever 5 is rotated clockwise about the shaft 5c, and the pin 2c of the head mount 2 is pushed by the winding spring 6 to move the head mount. 2 moves downward against the force of the retracting spring 9 to move the guide pin 1b of the chassis 1
Stops at the position where it contacts the upper end of the guide hole 2b of the head mount 2. This position is the play position, and the magnetic head 3 enters deeper than the upper end surface _{1 of the} cassette pack and is strongly pressed against the magnetic tape TP. At this time, although the clapper-type electromagnet 16 is not excited, the indexing lever 8 is rotated counterclockwise by the coil spring 17, and the movable iron core 16a is brought into contact with the fixed iron core side. The indexing positioning pin 8b of the indexing lever 8 is brought into contact with the left edge of the hole above the indexing positioning hole 2d.

It should be noted that the pin 5f projected on the lower surface of one end of the head advancing lever 5 moves an unillustrated advancing plate,
The hub drive system etc. switches to the play state.

[Movement from Play Position to Cue Position] FIGS. 2 and 3
When the cueing switch 31 is pressed in the play state, the microcomputer 34 causes a current to flow through the clapper-type electromagnet 16 to excite it, and the movable iron core 16a is attracted to the fixed iron core to lock the cueing lever 8. Also, solenoid type electromagnet 7
A current in the negative direction is applied for a predetermined time to release the excitation. When the excitation of the electromagnet 7 is released, the head cradle 2 retreats upward by rotating the head advancing lever 5 by the force of the retreat spring 9, but the head locating lever 8 is locked, so that the head locating positioning is performed. Pin 8b is located at the cue positioning hole 2d
The head mount 2 stops at the position shown in FIG. This position is the cueing position, and the magnetic head 3 is inserted into the pack shallower than the upper end surface ₁ of the cassette pack and is abutted lightly on the magnetic tape TP. In this state, the tape running speed is switched to the fast-forward state by the pin 5f of the head advancing lever 5, and the microcomputer
34 performs cueing of the designated song in a known manner.

[Return to Play Position After Completion of Cue] See FIG. 2 and FIG. 3. Upon completion of cueing, the microcomputer 34 energizes the solenoid type electromagnet 7 by flowing a current in the + direction for a predetermined time. As a result, the head advance lever 5 is rotated clockwise, the pin 2c is pushed by the coil spring 6, and the head mount 2 is moved to the play position. Further, the microcomputer 34 deenergizes the clapper type electromagnet 16 upon completion of cueing. This is to prevent wasteful power consumption.

[Movement from Play Position to Eject Position] See FIG. 1 and FIG. 2. When the eject switch 32 is turned on, the microcomputer 34 applies a − direction current to the solenoid type electromagnet 7 for a predetermined time to release its excitation. . This allows the head mount 2
Is retracted upward by the force of the retracting spring 9. During this retreat, the indexing positioning pin 8b of the indexing lever 8 is caught in the step of the indexing positioning hole 2d of the head mount 2, but the force of the coil spring 17 is sufficiently larger than the force of the retracting spring 9. Since it is made small, the pin 8b easily falls off the step, and the head mount 2 further retracts to reach the eject position.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various other additions and modifications can be made. For example, instead of the clapper type electromagnet 16, another type of electromagnet such as a solenoid type electromagnet may be used. It can also be applied to a cassette deck that does not have a loading mechanism. In this case, the output of the play switch may be used instead of the loading completion detection switch 30.

Effects of the Invention As described above, according to the present invention, the movement of the magnetic head to the play position, the cueing position, and the eject position can be realized with a simple and compact mechanism, and the eject lever can be pushed in. Ejection is possible by operating an electric switch without requiring mechanical operation, and so-called feather touch can be realized. Further, the locking force of the head mount 2 at the cue position is the sum of the force of the coil spring 17 and the attraction force of the electromagnet 16, and due to vibration or the like, the cue positioning pin 8b of the cue lever 8 and the cue position of the head frame 2 are positioned. The engagement of the stepped portion of the use hole 2d is never released, and the vibration resistance is improved. Further, since the force of the coil spring 17 is sufficient to rotate the indexing lever 8 in the counterclockwise direction, a coil spring having a large force is not necessary, and the electromagnet 16 can be small in size. .

[Brief description of drawings]

1 to 3 are plan views of the essential portions of an embodiment of the present invention, FIG. 4 is a block diagram showing an example of the electrical configuration of the present invention, and FIG. 5 is an electrical process of head movement control of the present invention. 6 is a timing chart for explaining the operation of the present invention, FIG. 7 to FIG. 9 are plan views of a main part of a conventional head moving mechanism, and FIG. 10 is an example of a conventional electrical configuration. FIG. 11 is a block diagram showing the same, FIG. 11 is a flow chart showing an example of the electrical processing of the conventional head movement control, and FIG. 12 is a timing chart for explaining the conventional operation. 1 is a chassis, 1a and 1b are guide pins, 1c and 1d are guide holes, 2 is a head mount, 2a and 2b are guide holes, 2c is a pin, 2d is a cue positioning hole, 2e and 2f are guide pins, 3 Is a magnetic head, 5 is a head advance lever, 6 is a winding spring, 7 and 11 are solenoid type electromagnets, 8 is a cue lever, 8a is a shaft, 8b is a cue positioning pin, 9 is a retract spring, 10, 17 is a coil spring, 16 is a clapper type electromagnet, ₁
Is the top surface position of the cassette pack, and TP is the magnetic tape.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takanori Takanashi 1-2-2 Goshodori, Hyogo-ku, Kobe, Hyogo Prefecture Fujitsu Ten Ltd. (72) Inventor Keijiro Konan 1-chome Goshodori, Hyogo-ku, Kobe No. 28 No. 28 within Fujitsu Ten Ltd. (56) Bibliography Showa 57-94651 (JP, U) Showa 58-97740 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A moving mechanism for moving a magnetic head to a predetermined play position, cueing position, and eject position, the magnetic head being mounted and mounted on a chassis so as to be movable back and forth in the moving direction of the magnetic head. A head mount, an engaging means for stopping the head mount at the play position, an engaging means for stopping the head mount at the eject position, a retracting spring for urging the head mount in the eject position direction, and a play time A first electromagnet that is excited and unexcited at the time of cueing and ejecting, and a rotatably rotatably supported on the chassis and rotated by the excitation of the first electromagnet to move the head mount in the play position direction. A state in which the head advancing lever to be pushed in and the cue positioning pin provided at one end are inserted into the cue positioning holes provided in the head mount. The sucking and rotatably the cueing lever pivotally supported on the chassis, a movable core mounted on the other end of the indexing lever is energized only when cue 2
And a spring that has a smaller spring force than the retreating spring and that gives a force for rotating the cue lever in a direction in which the movable iron core moves toward the fixed iron core of the second electromagnet. In the state, the cue positioning pin is configured to be locked to the stepped portion of the cue positioning hole.