JPH0325309Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a mode switching device for a cassette tape player that switches between a stop mode and a playback mode by moving a head base to which a magnetic head is attached.

[Technical background of the invention]

Generally, in a cassette tape player,
By moving the head base on which the magnetic head is attached, you can switch between a stop mode (STOP mode) in which the magnetic head moves backward, and a playback mode (CUE mode and PLAY mode, as well as RECORD mode) in which the magnetic head moves forward. However, in connection with this, the brakes are moved forward and backward relative to the pair of reel stands during switching between the stop mode and the playback mode.

In addition, there is also a fast forward mode (FF mode).
There are also rewind mode (REW mode), etc.
These modes are the same as the stop mode in terms of mechanical operation and are related exclusively to the rotational drive of the reel stand, so they will not be explained here.

[Problems with background technology]

By the way, the conventional mode switching device for a cassette tape player has two mechanisms, namely, a head base movement mechanism and a brake advancement/retraction mechanism, and these mechanisms are interlocked when switching between stop mode and playback mode. The mechanism is complicated,
There were drawbacks such as the large load on the motor and the impediment to speeding up the switching operation.

[Purpose of invention]

The present invention was developed in view of the above points, and aims to simplify the structure and speed up the switching operation in a mode switching device for a cassette tape player. The purpose is to effectively link the forward and backward movements to make the switching operation faster and to downsize the device.

[Summary of the idea]

The mode switching device for a cassette tape player of the present invention is a mode switching device for a cassette tape player that switches between a stop mode and a playback mode by moving a head base to which a magnetic head is attached. , a partially toothed gear that is rotated by meshing with the drive gear, a head moving cam provided on one surface of the partially toothed gear that pushes the head base in the direction of the playback mode, and a head moving cam that pushes the head base in the direction of the stop mode. A spring is biased to bring the head into contact with the head moving cam, and a locking body provided on the other side of the partially toothed gear is activated by an operation command to rotate the partially toothed gear. a plurality of engaging portions that stop the head base moved to the stop mode and playback mode positions by the head moving cam; and a stop mode provided on the other surface of the partially toothed gear. and a brake moving cam having a plurality of pushing parts corresponding to the playback mode, and a pair of reel stands that are provided so as to be movable forward and backward, and the head base is positioned in a stop mode and a playback mode by the head movement cam. When the brake frame is pushed by the corresponding pushing part of the brake movement cam and separated from the pair of reel stands, the brake frame is urged toward the pair of reel stands to move the brake. a brake spring that is brought into contact with the cam and brings the brake frame into contact with the pair of reel stands when the head base is located between the stop mode and the playback mode positions by the head moving cam; and an outer periphery of the partially toothed gear. a plurality of toothless portions disengaged from the drive gear when the head base is in the stop mode or regeneration mode position by the head movement cam; and a pushing force corresponding to the stop mode of the brake movement cam. When the locking body is disengaged from the engaging portion corresponding to the stop mode in the stop mode, the brake frame biased by the brake spring engages the partially toothed gear. It is characterized by comprising an inclined part that applies rotational force in a predetermined direction to mesh the partially toothed gear and the drive gear, and with this configuration, one partially toothed gear can move the head base and move the brake frame. It moves forward and backward, and effectively coordinates these movements.

[Example of idea]

The mode switching device for a cassette tape player of the present invention will be specifically constructed based on the embodiment shown in the drawings.

1 to 4, reference numeral 1 denotes a front chassis, and a pair of capstan shafts 2 and 3 on both sides are supported at the lower center of the chassis 1 with both ends projecting forward and backward of the chassis 1. At the rear ends of the shafts 2 and 3, there are flywheels 4,
5 is attached to the right side, that is, the outbound capstan shaft 2, and a drive gear 6 is attached adjacent to the flywheel 4.

9 is the rear chassis, and this chassis 9
A constant-speed drive motor 10 is attached to the rear surface with its drive shaft protruding from the front of the chassis 9. A drive pulley 11 is attached to this drive shaft, and the drive pulley 11 and each of the flywheels 4, 5 are connected to each other. An endless drive belt 12 is wrapped around the
Driven by the motor 10, the pair of capstan shafts 2 and 3 and the drive gear 6 are moved in a predetermined direction, that is, the capstan shaft 2 and the drive gear 6 for the outward trip are moved in a counterclockwise direction (as viewed from the front, hereinafter referred to as the direction of the other rotating members). (Unless otherwise specified, the direction of rotation is the same as the front view.)
The return trip capstan shaft 3 is designed to rotate clockwise.

Further, a head base 15 is installed at the lower center of the front surface of the front chassis 1 through its plurality of elongated holes 15a and a plurality of pins 1a implanted in the chassis 1.
A head support member 16 is attached to the lower center of the front surface of the head base 15, and a combination type magnetic head 17, that is, two magnetic heads for erasing and playback/recording, is mounted on the upper part of the support member 16. A device equipped with heads 17a and 17b is supported rotatably within a range of 180 degrees, and a magnetic head 17 is provided at the bottom of the support member 16.
A pinion 18 is provided which rotates together with the motor.

A rocking body 21 is swingably supported at the lower part of the support member 16 through a shaft 22, and has an arcuate rack part 21a at the front end that meshes with the pinion 18, and a protrusion 21b at the rear end. By moving the protrusion 21b of the rocking body 21 from side to side, the rocking body 21 swings, and its engagement with the rack part 21a causes the pinion 18 to rotate, and the magnetic head 17 to rotate. I'm starting to do that. Note that a disk 23 is provided at the bottom of the pinion 18.
A spring 24 is provided between the disk 23 and the oscillating body 21, and this spring 24 allows the disk 23 to move around the center of its rotation range, that is, the 180 degree rotation range of the magnetic head 17. The magnetic head 17 is biased to rotate in the direction of the rotation limit closest to the boundary, so that the magnetic head 17 can be accurately oriented in a predetermined direction, that is, in the direction of the forward mode or the direction of the backward mode.

Further, a limiter plate 27 for moving the head is provided at the center of the rear surface of the front chassis 1, and a limiter plate 27 is provided in the plurality of elongated holes 27.
7a and a plurality of pins 1b implanted in the chassis 1
An engaging piece 27b is bent from the lower right side of the limiter plate 27 to the front side of the chassis 1.
A rod-shaped spring 28 is provided between the chassis 1 and the chassis 1 via the lower part of the bearing 29 of the left capstan shaft 3, and this spring 29 causes the limiter plate 27 to
is urged downward, and the engaging piece 27b of the limiter plate 27 is opposed to the upper side of the head base 15, and a spring 30 is provided between the limiter plate 27 and the head base 15.
0, the head base 15 is urged upward and is locked to the engaging piece 27b of the limiter plate 27. When the limiter plate 27 is moved up and down, the head base 15 is also moved up and down, and the limiter plate 27 is moved up and down. Head base 1 even when 27 is fixed.
5 can be pushed downward against a spring 30.

In addition, there are 1 on both sides at the lower front of the front chassis 1.
A pair of pinch roller support frames 33 and 34 are swingably supported via a pin 1c implanted in the chassis 1, and pinch rollers 35 and 36 are rotatably supported at the tip of each support frame 33 and 34. At the same time, locking pieces 33a and 34a are bent and formed at the rear end of each support frame 33 and 34, and this locking piece 33
a, 34a are opposed to a pair of locking pieces 15b bent at the lower front part of the head base 15, and a spring 37 is provided between the tips of the support frames 33, 34 and the head base 15. The spring 37 urges the tips of the support frames 33 and 34 upward, so that the locking pieces 33a and 34a are locked to the locking piece 15b of the head base 15. When the head base 15 is raised, the tips of the support frames 33 and 34 are further raised, so that the pinch rollers 35 and 36 come into contact with the capstan shafts 2 and 3.

Further, a slide plate 40 for rotating the head is installed in the plurality of elongated holes 40a and in the chassis 1 on the front surface of the chassis 1, located between the lower part of the front chassis 1 and the lower part of the head base 15. A pair of actuating pieces 40b are bent toward the rear side of the chassis 1 from the central lower part of the slide plate 40, which is supported via a plurality of pins 1d to be movable in both directions. The above rocking body 21
The protrusion 21b of the slide plate 40 is engaged with the protrusion 21b of the slide plate 40.
By moving left and right, the swinging body 21 swings, and the magnetic head 17 rotates between the backward and outward modes.

Locking pieces 40c are bent and formed on both front sides of the slide plate 40, and the pair of locking pieces 40c
c selectively faces locking pieces 33b and 34b bent at the rear of the base end of each of the support frames 33 and 34, and when the slide plate 40 moves to the left, it moves to the right. The locking piece 40c faces the locking piece 33b of the support frame 33 of the forward pinch roller 35, so that even when the head base 15 is raised, the locking pieces 40c and 33b come into contact with each other, preventing the pinch roller from being pinched. The roller 35 and the capstan shaft 2 are prevented from coming into contact with each other, and the slide plate 4
When 0 moves to the right, the left locking piece 40c
are opposed to the locking pieces 34b of the support frame 34 of the pinch roller 36 for the return trip, so that even when the head base 15 is raised, the locking pieces 40c, 34b are in contact with each other, and the pinch roller 36 and the capstan shaft are in contact with each other. 3 is prevented from coming into contact with it.

Further, a pair of reel stands 43 and 44 are rotatably supported on both sides at the center of the front surface of the front chassis 1, and drive shafts 43a and 44a and gears 43b and 44b are mounted on the reel stands 43 and 44, respectively. A swing gear 4 is integrally formed between each gear 43b and 44b.
5 is rotatably and swingably provided via a swing frame 47 formed to be swingable in both directions about a shaft 46, and each chassis 1,
A drive gear 48 attached to a forward/reverse drive motor (not shown) provided between 9 and 9 is meshed with each other, and when the drive gear 48 is rotated counterclockwise by the motor, the swing gear 45 swings to the right. and meshes with the gear 43b of the right reel stand 43, so that the reel stand 43 rotates counterclockwise.
When the drive gear 48 is rotated clockwise by the motor, the swing gear 45 swings to the left and meshes with the gear 44b of the left reel stand 44, so that the reel stand 44 rotates clockwise. It's summery.

A brake frame 51 is supported at the center of the rear surface of the front chassis 1 so as to be movable in the vertical direction via its plurality of long holes 51a and pins 1a and 1b implanted in the chassis 1. A pair of brake bodies 52 made of an elastic body such as rubber are located in the through hole 1f of the chassis 1 at the front of the upper end.
The pair of brake bodies 52 are opposed to the upper sides of the gears 43b and 44b of the respective reel stands 43 and 44, and the brake body 52 is installed between the brake frame 51 and the chassis 1 and the pin 1b. A spring 53 is provided, and the brake frame 51 is urged downward by the brake spring 53. When the brake frame 51 is free, the pair of brake bodies 52 are connected to the gears 43b and 43b of each reel stand 43, 44, respectively.
44b.

Further, a first partially toothed gear 55 is provided on the left side of the drive gear 6 at the rear of the front chassis 1.
A second partially toothed gear 56 is rotatably supported on the right side of the drive gear 6 via a pin 1b implanted in the chassis 1. These partially toothed gears 55 and 56 are freely supported, and mesh with the drive gear 6 to rotate clockwise.

As shown in FIG. 5, a head moving cam 59 is integrally formed on the front surface of the first partially toothed gear 55, and a head moving limiter plate is provided on the upper side of the cam 59. An engagement pin 27c implanted on the rear surface of the gear 27 is engaged, and by clockwise rotation of the first partially toothed gear 55,
The limiter plate 27 and the head base 15 are designed to move up and down. The positional relationship of the engagement pin 27c with respect to the cam 59 is as shown in the figure, that is, the engagement pin 27c is in the stop mode position of the head base 15 in the position A, the high speed regeneration mode position of the head base 15 in the position B, and the position C. corresponds to the constant speed playback/recording mode position of the head base 15,
Of these, the engagement pin 27c is located at the positions B and C.
Since the surface of the cam 59 is located on the right side of the cam 59, when the cam 59 is free in high-speed playback mode and constant-speed playback/recording mode, the cam 59 is moved by the spring 28. cam 59
The engagement pin 27c is biased toward the center of the engagement pin 27c, which causes the engagement pin 27c to rotate slightly clockwise.

As also shown in FIG.
B, 62C are integrally provided, and a first locking arm 63 as a locking body is implanted in the chassis 1 on the rear surface of the front chassis 1.
This locking arm 63 is swingably supported via the rear surface of the chassis 1, and this swinging causes the locking arm 63 to swing. The protrusion 63a on the upper surface side of the tip is connected to each of the above-mentioned engaging portions 62a, 62.
B, 62C are designed to be engaged and disengaged. In addition,
Engagement pin 27 for the head moving cam 59
The engaging portions 62a, 62ro, and 62c move to positions relative to the protrusion 63a in accordance with positions a, b, and c of c, that is, stop, high-speed playback, and constant-speed playback/recording modes. Therefore, the protrusion 63a is connected to each engaging portion 62a, 62b, 62b.
When the first partially toothed gear 55 is prevented from rotating clockwise (counterclockwise in FIG. 6), the head base 15 stops, performs high-speed playback, and constant-speed playback/recording. It is designed to stop at the mode position.

The rear surface of the first partially toothed gear 55 is provided with three pushing parts 66a, 66ro and 66c located outside of the respective engaging parts 62a, 62ro and 62c. A cam 66 for use is integrally formed, and an engaging protrusion 51b protruding from the lower end of the brake frame 51 is engaged with the upper side of the cam 66 by the biasing force of the brake spring 53. The clockwise direction of the first partially toothed gear 55 (sixth
The brake frame 51 is designed to move up and down by rotation (counterclockwise in the figure). In addition,
Engagement pin 27 for the head moving cam 59
The respective pushing parts 66a, 66b, and 66c move to positions relative to the engagement protrusion 51b in accordance with the respective modes of stop, high-speed playback, and constant-speed playback/recording. Therefore, when the head base 15 is in the stop, high-speed playback, and constant-speed playback/recording modes, the brake frame 51 rises and the brake body 52
are the gears 43b and 44b of the reel stands 43 and 44.
When the brake frame 51 is separated from the position between the respective mode positions, the brake frame 51 is lowered by the urging force of the brake spring 53, and the brake body 52 is moved to the reel stands 43, 44.
gears 43b, 44b.

The pushing portion 66a corresponding to the stop mode of the brake moving cam 66 has an inclined portion 66a.
However, the pushing part 66 corresponding to the above-mentioned high-speed playback mode
When the head base 15 is in the stop mode position, the engaging protrusion 51 of the brake frame 51 is attached to the inclined portion 66a of the pushing portion 66a.
b is brought into contact with the brake spring 53, and therefore, when the cam 66 is in the free state in the stop mode, that is, the protrusion 63a of the first locking arm 63 is in the engagement portion. When it leaves the cam 62, the cam 66, that is, the first partially toothed gear 55
is rotated slightly clockwise (counterclockwise in FIG. 6) by the brake frame 51 which is urged downward by a brake spring 53.

Furthermore, on the outer periphery of the first partially toothed gear 55,
Three toothless parts 55a, 55ro and 55c are formed, and when each toothless part 55a, 55ro and 55c rotates to the position relative to the drive gear 6, the drive gear 6 and the first toothless part are rotated. The tooth gear 55 is disengaged so that the drive gear 6 can rotate independently. The positions of the engaging pins 27c with respect to the head moving cam 59 are set at the toothless portions 55a, 55b, and 55b, respectively, corresponding to the modes of stop, high-speed playback, and constant-speed playback/recording. 55 is adapted to move to a position relative to the drive gear 6. Therefore, the head base 15 is in the position of each mode of stop, high-speed playback, and constant-speed playback/recording, and the position of each of these modes is In this position, the protrusion 63a of the first locking arm 63 comes into contact with each of the engaging parts 62a, 62ro, and 62c corresponding to each mode, and the first partially toothed gear 55 and the head base 15 When stopped at the mode position, the drive gear 6 can rotate independently.

Further, as shown in FIGS. 7, 9, and 10, an engagement protrusion 69 for rotating the head is integrally formed on the front surface of the second partially toothed gear 56, and this engagement A slide cam 70 for rotating the head that engages with the mating protrusion 69 is connected to the plurality of elongated holes 70a and the plurality of pins 1 implanted in the front chassis 1.
The protrusion 70b protruding from the front right side of the slide cam 70 is supported via the slide plate 4 for rotating the head so as to be movable in both directions via the slide cam 70.
0, and is fitted on the right side of the second partially toothed gear 5.
6 clockwise (counterclockwise in Figure 10)
Due to the rotation of the engaging protrusion 69, the slide cam 70
The slide cam 70 is moved left and right by sliding on the inner periphery of the slide plate 40, thereby moving the magnetic head 17 to a return mode and an outward mode via the slide plate 40. The positional relationship of the engagement protrusion 69 with respect to the slide cam 70 is as shown in the figure, that is, in the return mode of the magnetic head 17 in which the engagement protrusion 69 is in position 2 and the slide cam 70 and the slide plate 40 are moved to the left. Correspondingly, the second toothless gear 56 rotates 180 degrees clockwise from this state, and the slide cam 70 and the slide plate 40 move to the right with the engagement protrusion 69 moved to the E position. It is designed to correspond to the outward travel mode of the magnetic head 17 that has moved, and moreover, when the engaging protrusion 69 moves from the position D to the position E, and when it moves from the position E to the position D. Even when
The engagement protrusion 69 is connected to the arcuate portion 70 of the slide cam 70.
After concentrically moving C, the linear portion 70d is pushed, and then the arcuate portion 70c on the opposite side is moved. does not rotate immediately, but starts rotating after a predetermined period of time, and the engagement protrusion 69
The rotation is completed a predetermined time before moving to the E or D position.

As shown in FIG. 8, two engaging portions 73N and 73E are integrally provided on the rear surface of the second partially toothed gear 56, and a second engaging portion 73N and 73E are integrally provided on the rear surface of the front chassis 1. A second locking arm 74 is swingably supported via a pin 1j implanted in the chassis 1, and this locking arm 74 is swung by a second solenoid 75 attached to the rear surface of the chassis 1. This swinging causes the protrusion 74a on the left side of the distal end of the locking arm 74 to engage and disengage from each of the engaging portions 73N and 73E. In addition, the slide cam 70 for rotating the head is
The positions of the engaging protrusions 69 relative to the respective engaging portions 73 are
D and 73E move to the position relative to the protrusion 74a, so that the protrusion 74a comes into contact with each engaging portion 73D and 73E, and the second partially toothed gear 56 moves clockwise. (Counterclockwise in Figure 8)
When the rotation of the head is prevented, the slide plate 40 for rotating the head stops at the position of each of the backward and forward travel modes.

Then, on the rear surface of the second partially toothed gear 56, two push release parts 77N, 77E are located behind each of the engagement parts 73N, 73E, and two push parts 77 are provided.
A head retracting cam 77 having a push-motion maintaining portion 77d and a push-motion maintaining portion 77d is integrally formed.
A push lever 78 is provided on the rear surface of the front chassis 1,
The push lever 78 is swingably supported via a pin 1k implanted in the chassis 1, and a spring rod 78a is implanted at the right end (left end in FIG. 8) of the push lever 78, and at the left end. A push pin 7 is attached to the front side of the chassis 1 from the right end in FIG.
8b is provided protrudingly, and the right end of the push lever 78 and its spring rod 78a are opposed to the upper side of the cam 77, and the push lever 78 has a push pin 78b at the left end.
is opposed to the upper side of the protrusion 15c bent on the upper right side of the head base 15. Furthermore, a spring 79 is provided between the push lever 78 and the chassis 1, and the spring 79 causes the push lever 78 to be pushed. lever 78
is biased clockwise (counterclockwise in FIG. 8), and the rotation of the second partially toothed gear 59 in the clockwise direction (counterclockwise in FIG. 8) causes the push lever 78 to move. The push pin 78b moves up and down, and as a result, when the head base 15 is elevated to the positions of high-speed playback and constant-speed playback/recording modes, the push pin 78b moves up and down. When lowered, the head base 15 is pushed downward against the spring 30, that is, toward the stop mode position. The positional relationship of the cam 77 with respect to the right end of the push lever 78 is as shown in the figure, that is, the right end of the lever 78 (the left end in FIG. 8).
The state in which the push release part 77 of the cam 77 is positioned corresponds to the return mode of the magnetic head 17, and from this state the second toothless gear 56 rotates 180 degrees clockwise, and the right end of the lever 78 Push release part 7 on the opposite side
7 corresponds to the outward travel mode of the magnetic head 17 in a state in which the cam 77 is in the push release part 77 relative to the right end of the lever 78.
When moving from D to the push release part 77E on the opposite side, and from this push release part 77E to the original push release part 7
At any time when moving to 7D, press lever 7.
After moving the pushing part 77c of the cam 77, the right end part of the cam 77 moves the pushing maintaining part 77d, and then moves to the pushing releasing part 77E or 77D.
When the partially toothed gear 56 begins to rotate, the lever 78 immediately rotates counterclockwise (clockwise in FIG. 8) and its push pin 78b descends, and this state is then maintained for a predetermined period of time. After that, the push pin 78b is raised, and the push portion 77c of the head retraction cam 77 corresponds to the arcuate portion 70c of the head rotation slide cam 70.
The push maintaining portion 77d and the straight portion 70d correspond to each other, thereby causing the second partially toothed gear 56 to move to a predetermined position.
When rotating 180 degrees, the magnetic head 17 rotates after the push pin 78b descends, and then the push pin 78b rises.

Note that the engaging portion 73 of the second partially toothed gear 56
D and 73E are protrusions 74a of the second locking arm 74.
When the spring bar 78a of the push lever 78 is in contact with the head retracting cam 7 and is prevented from rotating, the spring bar 78a of the push lever 78
The right end of the lever 78 comes into contact with the terminal end of the push-motion maintaining section 77d of No.
6 receives a biasing force in a clockwise direction (counterclockwise in FIG. 8) from a spring 79 via a spring bar 78a of a lever 78, and therefore locks the protrusion 74a of the second locking arm 74. When removed from the joints 73 d and 73 e, the second partially toothed gear 56 is slightly rotated clockwise.

Furthermore, on the outer periphery of the second partially toothed gear 56,
Two toothless portions 56 ni and 56 e are formed, and when these toothless portions 56 ni and 56 e are rotated to a position relative to the drive gear 6, the drive gear 6 and the second toothless gear 56 are brought into mesh with each other. This allows the drive gear 6 to rotate independently. Note that each engaging portion 73 is connected to the protrusion 74a of the second locking arm 74.
The toothless portions 56N and 56E move to positions relative to the drive gear 6 in accordance with the state in which the magnetic head 73E is moved, that is, the backward and forward travel modes. The protrusion 74a of the second locking arm 74 is in the position of each of the return and outbound modes, and in the position of each mode, the protrusion 74a of the second locking arm 74 is in the position of each engagement part 73 corresponding to each mode.
When the second partially toothed gear 56 comes into contact with 73E and stops, the drive gear 6 can rotate independently.

In addition, in FIG. 1, 82 indicates a cassette half.

Next, the operation will be explained.

In the illustrated state, the limiter plate 27 for moving the head and the head base 15 are lowered to the stop mode position, and the magnetic head 17 and the pinch roller 35,
36 indicates a stop mode in which the cassette half 82 is spaced below, and the slide plate 40 for rotating the head moves to the left, and the magnetic head 17 is in the return mode, that is, the magnetic head 17a for erasing is located at the front right side. position, and the magnetic head 17b for playback/recording is located at the front left side, and the locking piece 33b of the support frame 33 of the pinch roller 35 for the right forward path is connected to the locking piece 33b of the slide plate 40. 40c are facing each other, that is, even if the head base 15 is raised, the outgoing pinch roller 35 does not come into contact with the capstan shaft 2, and the left returning pinch roller 3
6 is shown in a state where the head base 15 is raised and can come into contact with the capstan shaft 3.

When switching from the illustrated stop mode to the constant speed playback/recording mode; the constant speed drive motor 10 drives the capstan shaft 2 and drive gear 6 counterclockwise, and the capstan shaft 3 clockwise at a constant speed. Continuous excitation of the first solenoid 64 causes the first locking arm 63 to swing counterclockwise (clockwise in FIG. 6) about the pin 1h, so that the protrusion 63a is connected to the first partially toothed gear. 55 from the engaging portion 62a on the rear surface.

As a result, the first partially toothed gear 55 becomes free, and the engaging protrusion 51b of the brake frame 51, which is urged downward by the brake spring 53, and the brake moving cam 66 on the rear surface of the partially partially toothed gear 55 Pushing part 6
Due to the relationship of the inclined portion 66a of 6a, the partially toothed gear 55
rotates clockwise (counterclockwise in FIG. 6) and meshes with the drive gear 6, and is rotated clockwise by the drive gear 6 to engage the engagement pin of the limiter plate 27 for moving the head. 27c and the head moving cam 59 on the front of the toothless gear 55, the limiter plate 2
7 and head base 15 begin to rise.

When the first partially toothed gear 55 rotates by a predetermined angle, for example approximately 150 degrees, from the stop mode, the protrusion 63a of the locking arm 63 engages with the drive gear 6, corresponding to the high-speed regeneration mode. Although the portion 62 ro and the toothless portion 55 ro move, since the first solenoid 64 is continuously excited, the protrusion 63 a and the engaging portion 62 ro do not come into contact with each other, and moreover, they are not engaged at this position. Because the pin 27c and the cam 59 are in the relationship shown in FIG. engaging pin 27
c, the partially toothed gear 55 rotates and meshes with the drive gear 6 again, and is rotated clockwise by the partially toothed gear 55, and furthermore, the limiter plate 27 and the head base 15 are connected to the engagement pin 27c and the cam. It rises due to the relationship of 59.

When the first partially toothed gear 55 further rotates by a predetermined angle, for example, approximately 120 degrees, and rotates by a predetermined angle, for example, approximately 270 degrees from the stop mode state, the protrusion 63a of the locking arm 63 and the drive gear 6 Then, the engaging portion 62c and the toothless portion 55c corresponding to the constant speed playback/recording mode move, and the protrusion 63a and the engaging portion 62c come into contact with each other to prevent rotation of the toothless gear 55. At the same time, the toothless gear 55 and the drive gear 6 are disengaged by the toothless portion 55C.

In this state, the engagement pin 27c and the cam 59 are in the relationship shown by C in FIG. 17 comes into contact with the tape inside the cassette half 82, and the pinch roller 36 for the return trip rises into the cassette half 82 and comes into contact with the capstan shaft 3 and the tape, allowing constant speed playback or recording. The playback/recording mode is activated.

At this time, the drive gear 48 is rotated clockwise by the drive of a motor (not shown), and the swing gear 4
By rotating the left and right reel stands 44 clockwise via the reel 5, the tape fed leftward at a constant speed by the capstan shaft 3 and the pinch roller 36 is wound up.

When switching from the constant speed playback/recording mode to the stop mode; the drive of the motor (not shown) is stopped to stop the rotation of the reel stand 44, and the excitation of the first solenoid 64 is released to stop the first locking arm. 63
is swung clockwise (counterclockwise in FIG. 6) about the pin 1h to separate the protrusion 63a from the engagement portion 62c on the rear surface of the first partially toothed gear 55.

As a result, the first partially toothed gear 55 becomes free, and the engagement pin 27c and the cam 59, which are urged downwardly by the spring 28, that is, toward the center of the head moving cam 59, are shown in FIG. According to the relationship shown in , the partially toothed gear 55 rotates clockwise and meshes with the drive gear 6, and is rotated clockwise by the drive gear 6, and the relationship between the engagement pin 27c and the cam 59 and Due to the biasing force of the spring 28, the limiter plate 27 and the head base 15 begin to descend.

When the first partially toothed gear 55 rotates by a predetermined angle, for example approximately 90 degrees, from the constant speed playback/recording mode, the protrusion 63a of the locking arm 63 and the drive gear 6 respond to the stop mode. The engaging portion 62a and the toothless portion 55i move, and the protrusion 63a and the engaging portion 6a move.
The toothless gear 55 is brought into contact with the toothless gear 55 to prevent rotation of the toothless gear 55, and the toothless gear 55 and the drive gear 6 are disengaged from each other by the toothless portion 55a.

In this state, the engagement pin 27c and the cam 59 are in the relationship shown by A in FIG.
For example, from constant speed playback/recording mode to approximately 7.
mm, and the magnetic head 17 and the return pinch roller 36 descend and separate from the inside of the cassette half 82, entering the stop mode, that is, the state shown in the figure.

When switching from the stop mode to the high-speed regeneration mode; the constant speed drive motor 10 drives the capstan shaft 2 and the drive gear counterclockwise and the capstan shaft 3 clockwise at a constant speed, and the first solenoid 64 is rotated at a constant speed. By energizing for a short time, the first locking arm 63 swings counterclockwise (clockwise in FIG. 6) about the pin 1h, and the protrusion 63a is engaged with the first partially toothed gear 55. Separate from the joint 62a.

As a result, the first partially toothed gear 55 becomes free, and the engaging protrusion 51b of the brake frame 51, which is urged downward by the brake spring 53, and the cam 6
Due to the relationship between the inclined portions 66a of the pushing portions 66a of 6, the partially toothed gear 55 rotates clockwise and meshes with the drive gear 6, and is rotated clockwise by the drive gear 6. Due to the relationship between the engagement pin 27c and the cam 59, the limiter plate 27 and the head base 15 begin to rise.

When the first partially toothed gear 55 rotates, for example, approximately 150 degrees from the stop mode, the engagement portion 62 corresponding to the high-speed regeneration mode engages the protrusion 63a of the locking arm 63 and the drive gear 6. B and missing tooth part 55
B moves, and by this time solenoid 6 has already been moved.
4 has been de-energized, the protrusion 63a and the engaging portion 62b come into contact with each other to prevent the partially toothed gear 55 from rotating, and the partially toothed gear 55 is prevented from rotating due to the partially toothed portion 55b.
5 and the drive gear 6 are disengaged.

In this state, the engagement pin 27c and the cam 59 are in the relationship shown in FIG. The magnetic head 17 and the return pinch roller 36 have both risen to a position approximately 1.5 mm below the mode state, but only the magnetic head 17 is in contact with the tape in the cassette half 82, and the pinch roller 36 is rising. is in a state where it does not come into contact with the capstan shaft 3 and the tape, that is, a high-speed reproduction mode.

At this time, the drive gear 48 is rotated clockwise by the drive of a motor (not shown), and the swing gear 4
By rotating the left reel stand 44 clockwise via the reel 5, the tape is sent to the left at high speed in the same way as fast forwarding in the backward direction and normal rewinding. As a result, high-speed playback is now possible.

When switching from high-speed playback mode to constant-speed playback/recording mode; After energizing the first solenoid 64 for a short time, after a predetermined period of time has elapsed in the de-energized state, the solenoid 64 is continuously energized again. The first locking arm 63 is swung in a counterclockwise direction (clockwise in FIG. 6) about the pin 1h, so that the protrusion 6
3a from the engaging portion 62b of the first partially toothed gear 55. In this case, the solenoid 64 is energized for a short time and then de-energized, but this de-energization is not necessarily necessary and it may simply be continuously energized.

As a result, the first partially toothed gear 55 becomes free, and the engaging pin 27c and the cam 59, which are urged downwardly by the spring 28, that is, toward the center of the head moving cam 59, are rotated as shown in FIG. Due to the relationship shown, the toothless gear 55 rotates clockwise and meshes with the drive gear 6, is rotated clockwise by the drive gear 6, and due to the relationship between the engagement pin 27c and the cam 59. The limiter plate 27 and head base 15 begin to rise.

When the first partially toothed gear 55 is rotated by a predetermined angle, for example, approximately 120 degrees from the high-speed regeneration mode, that is, approximately 270 degrees from the stop mode, the protrusion 63a of the locking arm 63 and the drive gear 6 are rotated. hand,
The engaging portion 62c and toothless portion 55c corresponding to the constant speed playback/recording mode move, and at this time, the solenoid 64 has already been continuously excited again.
The protruding portion 63a and the engaging portion 62c come into contact with each other to form the toothless gear 5.
5 is prevented from rotating, and the toothless gear 55 and the drive gear 6 are disengaged from each other by the toothless portion 55C.

In this state, the engagement pin 27c and the cam 59 are in the relationship shown by C in FIG. The magnetic head 17 rises approximately 7 mm above the position to approximately the highest position, and the magnetic head 17 reaches the cassette half 8.
At the same time, the pinch roller 36 for the return trip comes into contact with the capstan shaft 3 and the tape inside the cassette half 82, and a constant speed playback/recording mode is established.

When switching from high-speed regeneration mode to stop mode; by energizing the first solenoid 64 for a short time, the first locking arm 63 is swung counterclockwise (clockwise in FIG. 6) about the pin 1h. The protrusion 63a is moved away from the engaging portion 62b of the first partially toothed gear 55.

As a result, the first partially toothed gear 55 becomes free, and the engaging pin 27c and the cam 59, which are urged downwardly by the spring 28, that is, toward the center of the head moving cam 59, are rotated as shown in FIG. Due to the relationship shown, the toothless gear 55 rotates clockwise and meshes with the drive gear 6, is rotated clockwise by the drive gear 6, and due to the relationship between the engagement pin 27c and the cam 59. The limiter plate 27 and head base 15 begin to rise.

When the first partially toothed gear 55 is rotated by a predetermined angle, for example, approximately 120 degrees from the high-speed regeneration mode, that is, approximately 270 degrees from the stop mode, the protrusion 63a of the locking arm 63 and the drive gear 6 are rotated. hand,
The engaging portion 62a and toothless portion 55c corresponding to the constant speed playback/recording mode move, but at this time, the solenoid 64 has already been de-energized, so the protrusion 63a and the engaging portion 62h move. do not come into contact with each other, and in this position, the engagement pin 27c and the cam 59 are in the relationship shown by C in FIG. The partially toothed gear 55 is then rotated by the engaging pin 27c which is biased downward, that is, toward the center of the cam 59, and is again rotated by the drive gear 6. The limiter plate 27 and the head base 15 begin to descend due to the biasing force of the spring 28.

Then, the first partially toothed gear 55 further rotates to a predetermined angle, for example, from the high-speed regeneration mode state.
When rotated 210 degrees, the protrusion 63a of the locking arm 63
, the engaging portion 62a and the toothless portion 55i corresponding to the stop mode move relative to the drive gear 6, and the protrusion 63a moves.
The engaging portion 62a abuts against the partially toothed gear 55 to prevent rotation of the partially toothed gear 55, and the partially toothed gear 55 and the driving gear 6 are disengaged from each other by the partially toothed portion 55a.

In this state, the engagement pin 27c and the cam 59 are in the relationship shown in FIG.
The magnetic head 17 and the return pinch roller 36 are lowered and separated from the cassette half 82 to enter the stop mode, that is, the state shown.

When switching from constant-speed playback/recording mode to high-speed playback mode; In this case, the operation is as described above: switching from constant-speed playback/recording mode to stop mode and switching from stop mode to high-speed playback mode continuously. The explanation will be omitted as it is sufficient to do so.

Further, when switching between the stop mode, high-speed playback mode, and constant-speed playback/recording mode, the limiter plate 27 and the head base 15 are moved to the position of each mode by the cam 59 of the first partially toothed gear 55. At some point, each pushing part 66a, 66ro, 66c corresponding to the stop mode, high-speed playback mode, and constant-speed playback/recording mode of the brake moving cam 66 on the rear surface of the toothless gear 55 moves to the brake frame 51.
Since the engaging protrusion 51b of 1 is pushed up, 1
The pair of brake bodies 52 are separated from the gears 43b, 44b of each reel stand 43, 44, and therefore, each reel stand 43, 44 is in a state where it can freely rotate, and in the stop mode, each reel stand 43 ,4
The cassette half 82 can be easily inserted into the drive shafts 43a, 44a of No. 4, and the rotation of the reel stands 43, 44 during fast forwarding and rewinding is not hindered. reproduction·
The rotation of each reel stand 43, 44 is not hindered in the recording mode, and the limiter plate 27
When the head base 15 is moved between the positions of the above modes by the cam 59 of the first partially toothed gear 55, each of the pushing parts 66a, 66b and 66c of the brake moving cam 66 is pressed against the brake frame. 51, the brake frame 51 is lowered by the brake spring 53, and each brake body 52 engages the gear 43 of each reel stand 43, 44.
b, 44b, and therefore,
The tape inside the cassette half 82 can be prevented from loosening or becoming tangled.

Then, as described above, when the toothless gear 55 is in the stop mode, that is, when the toothless portion 55 of the first toothless gear 55 faces the drive gear 6 and is in a disengaged state, the toothless gear 55 As a means for applying a clockwise (counterclockwise direction in FIG. 6) rotational force to the cam, that is, as a means for meshing the partially toothed gear 55 and the drive gear 6, a pusher is pressed corresponding to the stop mode of the brake moving cam 66. The moving part 66a is provided with an inclined part 66a,
The engaging protrusion 51b of the brake frame 51 is urged downward by the inclined portion 66a and the brake spring 53.
Due to the relationship between the head base 15 and
It is no longer necessary to lower the head base 15 more than necessary, that is, to a position further below the stop mode position, and the movement stroke of the head base 15 can be reduced, making it possible to downsize the apparatus. That is, the means for applying rotational force to the partially toothed gear 55 in the stop mode is the same as the means for applying rotational force to the partially toothed gear 55 in the high speed playback mode and the constant speed playback/recording mode. A limiter plate 27 for head movement is biased downward by a spring 28.
Using the relationship between the engaging pin 27c and the head moving cam 59, the cam 59 is formed with a recess as shown by A in FIG. 5, and the engaging pin 27c is moved from the state shown by A in FIG. It is necessary to rotate the partially toothed gear 55 so as to move it several mm downward. Therefore, in this method, the head base 15
However, according to the configuration of the present invention, this does not occur.

When switching from the illustrated homeward mode to the forward mode; the constant-speed motor 10 drives the capstan shaft 2 and the drive gear 6 counterclockwise, and the capstan shaft 3 clockwise at a constant speed.
By energizing the solenoid 75 for a short time, the second locking arm 74 swings counterclockwise (clockwise in FIG. 8) about the pin 1j, and the protrusion 74a is moved to the second missing tooth. Engagement part 7 on the rear surface of gear 56
Release from 3D.

As a result, the second partially toothed gear 56 becomes free, and the push lever 7, which is biased clockwise (counterclockwise in FIG. 8) by the spring 79, becomes free.
The spring bar 78a of No. 8 pushes the terminal end of the push maintaining portion 77d of the head retraction cam 77 on the rear surface of the partially toothed gear 56 downward, and the partially toothed gear 56 moves clockwise (counterclockwise in FIG. 8). It rotates to mesh with the drive gear 6, and is rotated clockwise by the drive gear 6.

Then, while the second partially toothed gear 56 rotates by a predetermined angle, for example approximately 90 degrees, from the return mode, the right end (left end in FIG. 8) of the push lever 78
Since the pushing part 77c of the cam 77 moves relative to the pin 1k, the pushing lever 78 rotates counterclockwise (clockwise in FIG. 8) about the pin 1k, and the pushing pin 78b descends. .

Therefore, at this time, if the head base 15 is raised together with the limiter plate 27 for head movement to the position of the high-speed playback mode or constant-speed playback/recording mode, the push pin 78 of the push lever 78
b through the protruding piece 15c of the head base 15,
With the limiter plate 27 left as it is, only the head base 15 is pushed downward against the spring 30, and the head base 15 is moved to a predetermined retracted position, for example, approximately 5.5 mm below the constant speed playback/recording mode position, that is, the head base 15 is stopped. The cassette half 82 can be lowered and retracted to a position approximately 1.5 mm above the mode position, and the magnetic head 17 and return pinch roller 36 can be lowered and separated from the inside of the cassette half 82.

Further, when the pushing pin 78b of the pushing lever 78 is moved downward by the pushing part 77c of the cam 77,
The head rotating engagement protrusion 69 on the front surface of the second partially toothed gear 56 also rotates approximately 90 degrees clockwise (counterclockwise in Fig. 10) from the position shown by D. At this time, the engagement protrusion 69 Since the portion 69 moves concentrically with the arcuate portion 70c of the slide cam 70 for rotating the head, the slide cam 70 remains in the same state.

Therefore, the slide plate 40 for rotating the head fitted with the protrusion 70b of the slide cam 70 also remains in the same state, and the head 1 remains in the same state in the high-speed playback mode or the constant-speed playback/recording mode.
7 does not rotate within the cassette half 82.

Then, while the second partially toothed gear 56 further rotates by a predetermined angle, for example approximately 70 degrees, the cam 7
7 moves, the push pin 78b of the push lever 78 maintains the lowered state.

Therefore, at this time, if the head base 15 is lowered and retracted by the push pin 78b, the head base 15 maintains the retracted state.

Further, when the push pin 78b of the push lever 78 is kept lowered by the push maintaining section 77d of the cam 77, the engaging protrusion 69 moves toward the arcuate portion 7 of the slide cam 70
Since the slide cam 70 enters the straight section 70d from 0c and moves along the straight section 70d, the slide cam 70 moves to the right (to the left in FIG. 10).

Accordingly, the slide plate 40 fitted with the protrusion 70b of the slide cam 70 also moves to the right, thereby causing the swinging body 21 to swing counterclockwise in FIG. Due to the engagement of the pinion 18 with the magnetic head 17, the magnetic head 17 is rotated 180 degrees counterclockwise in FIG. Locking piece 3 of support frame 33
3b to the right and away, and instead, the left locking piece 40c of the slide plate 40 moves from the left below the locking piece 34b of the support frame 34 of the pinch roller 36 for the return trip. When the head base 15 is raised to the constant speed playback/recording mode position, only the outward pinch roller 35 can be brought into contact with the capstan shaft 2.

Then, while the second partially toothed gear 56 further rotates by a predetermined angle, for example approximately 20 degrees, that is, a total of 180 degrees from the initial return mode state, the right end of the push lever 78 (as shown in FIG. As the push release portion 77ho of the cam 77 moves relative to the left end (left end), the push lever 78 is moved clockwise (counterclockwise in FIG. 8) about the pin 1k by the spring 79.
, the push pin 78b rises, and after the predetermined angle of rotation, the spring bar 7 of the push lever 78
8a comes into contact with the terminal end of the push maintaining portion 77d of the cam 77, and the right end (left end in FIG. 8) of the push lever 78 is in a state floating above the push release portion 77e.

Therefore, at this time, if the head base 15 had been lowered and retracted by the pusher pin 78b in the high-speed playback mode or the constant-speed playback/recording mode, as the pusher pin 78b rises, The head base 15 is also raised by the spring 30 and returns to the original high speed playback mode or constant speed playback mode.
Return to recording mode position.

Further, when the push pin 78b of the push lever 78 is raised by the push release part 77E of the cam 77 and the spring 79, the engagement protrusion 69 moves from the straight part 70d of the slide cam 70 to the concentric circular arc part 70c. Since the slide cam 70 is inserted into the position shown in FIG. 7E, the slide cam 70 maintains the same state.

Therefore, the slide plate 40 fitted with the protrusion 70b of the slide cam 70 also maintains its state, and the direction of the magnetic head 17 and the pinch rollers 35, which are switched from the backward mode to the forward mode, are maintained as they are.
Locking pieces 33b, 34b of 36 support frames 33, 34
The relationship between the locking pieces 40c and the locking pieces 40c of the slide plate 40 also remains unchanged.

Furthermore, in this state, that is, the second partially toothed gear 56
has rotated a total of 180 degrees from the initial homeward mode position, the engagement portion 73e and toothless portion 56 corresponding to the forward mode are rotated with respect to the protrusion 74a of the locking arm 74 and the drive gear 6. Since the solenoid 75 has already been de-energized at this time, the protrusion 74a and the engaging portion 73E come into contact with each other, preventing the toothless gear 56 from rotating. The meshing between the partially toothed gear 56 and the drive gear 6 is released by E.

When switching from outbound mode to return mode; in this case, the operation of the second partially toothed gear 56 is
In order to move the engagement protrusion 69 for head movement from the position shown by E to the position shown by D by the rotation of the head, the slide cam 70 for head rotation and the slide plate 40 for head rotation are set in the above-mentioned return path mode. 2, the magnetic head 17 rotates 180 degrees clockwise in FIG. The left locking piece 40c of the plate 40 moves to the left from below the locking piece 34b of the support frame 34 of the return pinch roller 36, and is replaced by the right locking piece 40c of the slide plate 40. 4
0c moves from the right below the locking piece 33b of the support frame 33 of the forward pinch roller 35 and faces it, as shown in the figure, that is, when the head base 15 is raised to the constant speed playback/recording mode position. The only difference is that only the pinch roller 36 for the return trip can be brought into contact with the capstan shaft 3, and the rest is the same as the switching from the return trip mode to the outbound trip mode described above, so a description thereof will be omitted.

The relationship between switching between stop mode, high-speed playback mode, and constant-speed playback/recording mode, and switching between forward mode and return mode is based on the head base when switching between the three modes such as stop. The movement of the head base 15 is indirectly performed by following the movement of the limiter plate 27 for head movement by the first partially toothed gear 55, and the movement of the head base 15 when switching between two modes such as the forward path is performed by the second Since this is performed linearly by the partially toothed gear 56, switching between the three modes and switching between the two modes can be performed independently, regardless of the state of the three modes, that is, Switching between the two modes can be performed in any state of the three modes, and switching between the three modes and switching between the two modes can also be performed simultaneously.

Note that the above-mentioned high-speed playback mode is not limited to outputting the reproduced sound to the speaker, but also detecting whether the tape is recording or not recording and locating the beginning of a song, or It may also be used to search for unrecorded parts, that is, parts that can be newly recorded.

[Effect of idea]

As described above, according to the present invention, in a mode switching device for a cassette tape player that switches between a stop mode and a playback mode by moving a head base to which a magnetic head is attached, a drive gear interlocked with a capstan shaft is used to control a partially toothed gear. The head base is moved by the head moving cam of this toothless gear, and the brake frame is moved forward and backward by the brake movement cam of this toothless gear, so the movement of the head base and the movement of the brake frame Moreover, since no interlocking mechanism is required, the structure can be simplified, and the load on the motor is small, allowing for faster mode switching.In addition, the movement of the head base and the forward/backward movement of the brake can be effectively combined. At the same time, the movement stroke of the head base was reduced to eliminate unnecessary movement, so from this point of view,
The switching operation can be made faster, and the device can also be made more compact.

[Brief explanation of drawings]

The figures show an embodiment of the mode switching device for a cassette tape player of the present invention, in which Fig. 1 is a front view thereof, Fig. 2 is a bottom view thereof, and Fig. 3 is a portion related to the first partially toothed gear. In other words, the front view shows only the parts related to switching between stop mode and regeneration mode, and FIG. 4 shows only the parts related to the second partially toothed gear, that is, the parts related to switching between forward mode and return mode. 5 and 6 are respectively a front view and a rear view of the first partially toothed gear portion, and FIGS. 7 and 8 are a front view and a rear view, respectively, of the second partially toothed gear portion. , FIG. 9, and FIG. 10 are a front view and a rear view, respectively, of the slide cam portion that engages with the second partially toothed gear. 2, 3... Capstan shaft, 6... Drive gear,
15...Head base, 17...Magnetic head, 2
8... Spring, 43, 44... Reel stand, 51...
Brake frame, 53...brake spring, 55...first toothless gear, 55a, 55ro, 55c... toothless portion, 59...head moving cam, 62a, 62
b, 62c...engaging portion, 63...first locking arm as a locking body, 66...brake movement cam, 66i, 66b, 66c...pushing part, 66a
...Slope section.

Claims (1)

[Scope of Claim for Utility Model Registration] A mode switching device for a cassette tape player that switches between a stop mode and a playback mode by moving a head base on which a magnetic head is attached, comprising: a drive gear interlocked with a capstan shaft; a partially toothed gear that is rotated in mesh with the partially toothed gear; a head moving cam that is provided on one surface of the partially toothed gear and that pushes the head base in the playback mode direction;
A spring that urges the head base in the stop mode direction to abut the head moving cam engages with a locking body provided on the other surface of the partially toothed gear and activated by an operation command. a plurality of engaging portions that prevent rotation of the partially toothed gear and stop the head base moved to the stop mode and regeneration mode positions by the head moving cam; A brake moving cam is provided on the surface and has a plurality of pushing parts corresponding to the stop mode and the playback mode, and the head base is provided to be movable forward and backward relative to a pair of reel stands, and the head base is set to the stop mode and the playback mode by the head moving cam. A brake frame that is pushed by a corresponding pushing part of the brake moving cam to move away from the pair of reel stands when in the playback mode position, and a brake frame that is urged toward the pair of reel stands. a brake spring that is brought into contact with the brake moving cam and brings the brake frame into contact with the pair of reel stands when the head base is between the stop mode and playback mode positions by the head moving cam; A plurality of toothless portions are provided on the outer periphery of the toothless gear and disengage from the drive gear when the head base is in the stop mode or regeneration mode position by the head movement cam, and a plurality of toothless portions disengage from the drive gear, and the brake movement cam stops. The brake frame is provided on the pushing part corresponding to the mode and is biased by the brake spring when the locking body is disengaged from the engaging part corresponding to the stop mode in the stop mode. 1. A mode switching device for a cassette tape player, comprising: an inclined portion that applies rotational force in a predetermined direction to the partially toothed gear to mesh the partially toothed gear with the drive gear.