JPS633003Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the operation of a tape recorder, particularly the erroneous erasure prevention claw or the chrome tape detection claw, and its purpose is to reduce the resistance when inserting and ejecting a cassette. The purpose of the present invention is to provide a tape recorder that can be operated easily with less noise.

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

Reference numeral 1 denotes a chassis, and 2 a head stand which moves back and forth while being guided by guide pins 1a, 1b etc. fixed to the chassis 1, to which an erasing head 2a and a recording/reproducing head 2b are attached. 3 is a pinch roller unit equipped with a pinch roller 3a,
A capstan 4, which will be described later, is rotatably supported by a support pin 1c implanted in the chassis 1, and the pinch roller 3a is supported by a torsion spring 3b.
It is biased toward the a side. Further, the unit 3 is formed with a protruding piece 3c that abuts against the head stand 2, and an extension piece 3d that abuts on a protruding piece 10a of a set plate 10, which will be described later. 4 is a flywheel,
Its rotating shaft is the capstan 4a.

Reference numerals 5 and 6 denote a supply reel stand and a take-up reel stand, respectively, rotatably supported on the chassis 1. Reference numeral 7 designates a take-up unit, one end of which is a lever 7a, is pivotally supported by the chassis 1, and a take-up pulley 7b is pivotally supported approximately at the center. The rotation shaft of this take-up pulley 7b is provided so as to protrude from the lever 7a, and can come into sliding contact with the rubber roller of the take-up reel stand 6. Further, an engagement protrusion 7d is formed at the tip of the take-up lever 7a, and the engaging protrusion 7d comes into contact with the abutting front end edge 10b of the set plate 10, and a tension spring 7e is provided on the pivotally supported side to tension the take-up lever 7a between the take-up lever 7a and the chassis 1. The lever 7a is biased clockwise.
8 is a first motor, and a belt 9 is wound around a pulley 8a, a take-up pulley 7b, a flywheel 4, etc. Reference numeral 10 denotes a set plate slidably provided on the chassis 1, to which a tension spring 11 always applies a forward spring force.

Reference numeral 12 denotes a first gear bearing on the chassis 1, and an eccentric circular groove 12a is formed on the lower surface of the first gear, and a cam base 12b is formed approximately in the center of the eccentric circular groove 12a.
and a protrusion 12c are formed. and protrusion 1
2c is formed so as to be located concentrically with the middle of the narrowest groove portion _12a1 formed by the cam base 12b and the outer peripheral wall of the eccentric circular groove 12a. 13 is a second gear which meshes with the first gear, and this rotating shaft 1
A pulley (not shown) is attached to 3a, and a belt is wound between it and the pulley (not shown) provided on the rotating shaft of the flywheel 4. Therefore, when the flywheel 4 is rotated by the first motor 8, the first gear 12 is rotated via the second gear 13. A third gear 14 is rotatably supported by the chassis 1 and is meshed with the second gear 13, and has two cutout portions 14a that are not meshed with the second gear 13. Also this third
Cam teeth 14b and a cam plate 14 are provided on the upper surface of the gear 14.
c are integrally formed. 15 is cam tooth 1
4b, and is released from the meshing when the solenoid 16 is energized and attracted.

Reference numeral 17 denotes an auto-stop lever whose one end is pivotally connected to a stop lever to be described later, and a protrusion 17a provided on the lower surface of the approximately central portion thereof is engaged with the bifurcated arm 18, and a three-moon-shaped engagement protrusion formed at the tip thereof. 17b faces into the eccentric circular groove 12a of the first gear 12. The bifurcated arm 18 is rotatably attached to the rotating shaft 6a of the take-up reel stand 6, and is given a rotational force in the same direction as the take-up reel stand 6 rotates. When the take-up reel stand 6 stops rotating, it becomes free.

(For details on the relationship between the take-up reel stand 6 and the bifurcated arm 18, please refer to Japanese Patent Application No. 53-36121.) When the take-up reel stand 6 rotates in the tape winding direction, that is, in the direction of the arrow, A rotational force in the direction of the arrow is also applied to the bifurcated arm 18, and a rotational force in the direction of the arrow is applied to the auto-stop lever 17 with which the protrusion 17a is engaged. As a result, the engagement protrusion 17b is brought into a state along the outer circumferential wall of the eccentric circular groove 12a of the first gear 12. Further, the tape is rewound on the take-up reel stand 6. That is, when the bifurcated arm 18 rotates in the direction opposite to the arrow, a clockwise rotational force is applied to the bifurcated arm 18, so that the auto-stop lever 17 is applied with a rotational force in the opposite clockwise direction, and therefore the engagement protrusion 17b It will be in a state along the outer peripheral wall of the cam stand 12b. In any of the above cases, when the tape stops running and the take-up reel stand 6 stops rotating, the bifurcated arm 18 is in a free state where no force is applied in either the left or right direction of rotation. The biasing force applied to the top lever 17 also disappears. Therefore, after the first gear 12 rotates and the engagement protrusion 17b passes through the narrowest groove portion _12a1 , it remains positioned on the trajectory thereof, and therefore engages with the protrusion 12c located on the trajectory. As a result, the auto-stop lever 17 is pulled up, and the auto-stop lever 17 is connected to the lower end of the auto-stop lever 17 via the pin 19a.
9 is activated to perform an auto-stop operation, and then the engagement is released.

20 is a play arm, and a roller 20 is attached to one end.
a is provided, and a cam plate 14c of the third gear 14 is provided.
It corresponds to Further, a tension spring 20b is stretched between the other end of the play arm 20 and the head stand 2, and urges the play arm 20 in a counterclockwise direction so that the roller 20a is always in contact with the cam plate 14c. It's becoming like that.

21 is a swinging arm, the base end 21a of which
is rotatably attached to a fixed shaft 1d fixed to the chassis 1. The tip of the swinging arm 21 is a bearing portion 21b, and the rotating shaft 22
is inserted. A disk 23 is fixed to the lower end of the rotating shaft 22, and a felt 23a is attached to the upper surface of the disk 23. Reference numeral 24 denotes a planetary gear, which is loosely fitted to the rotating shaft 22 so as to be freely rotatable. Compression springs 2 are provided on the lower surface of the bearing portion 21b of the swing arm 21 and the upper surface of the planetary gear 24, respectively.
5 and 26 are arranged, and these compression springs 2
5, 26, in order from the top: bifurcated washer 27, first bush 28, washer 29,
The second bushes 30 are arranged one on top of the other. Therefore, the lower surface of the planetary gear 24 is connected to the compression spring 26.
is pressed against the felt 23a of the disk 23. Further, a protrusion 21c is protruded from the lower surface of the intermediate portion of the swing arm 21, and the bifurcated washer 27 is locked while sandwiching the protrusion 21c. A sun gear 31 is rotatably attached to the fixed shaft 1d, and as the swing arm 21 swings, the planet gear 24 moves to the sun gear 3.
It is designed to mesh while rolling around 1. A pulley 31a is formed below the sun gear 31, and a pulley 32a of the second motor 32
A belt 33 is wound between the two. Therefore,
The rotational force of the pulley 31a, that is, the sun gear 31, is transmitted to the rotating shaft 22 via the planetary gear 24 and the disk 23, and rotates the swing gear 34 attached to the upper end of the rotating shaft 22. Also, among the members sandwiched between the two compression springs 25 and 26, the first bushing 28 is fixed so as to rotate together with the rotating shaft 22, and therefore is pressed against it by the compression spring 25. The bifurcated washer 27 is also applied with a rotational force in the direction of rotation of the rotary shaft 22 and pushes the protrusion 21c of the swinging arm 21.
2, that is, the rotational force is applied in the same direction as the sun gear 31. Therefore, when the sun gear 31 is rotated in the direction of the arrow in FIG. 2, the swing gear 34 is rotated in the direction of the arrow, and the swing arm 21 generates a rotational force in the direction of the arrow about the fixed shaft 1d. , the swing gear 34 meshes with the gear 6c attached to the rotating shaft 6a of the take-up reel stand 6 to rapidly rotate the take-up reel stand 6 in the direction of the arrow, while the sun gear 31 is rotated in the direction of the arrow. When the swing arm 21 is rotated in the opposite direction (clockwise), the swing arm 21 swings to the left, and the swing gear 34, which is rotating in the opposite direction to the arrow, is engaged with the gear 5a of the rewind reel stand 5 to unwind the tape. Starts rewinding at high speed.

FIG. 4 shows another embodiment of the fast forward/rewind mechanism shown in FIG.
8 is disposed above the bifurcated washer 27, and the rotational force of the first bushing 28 is transmitted to the bifurcated washer 27 via a new washer 28a. In addition, what is shown by a virtual line in this figure is the balance weight 35, and the distance from the fixed axis 1d to the rotating shaft 22 is L, and the balance weight 35
If the distance to the center of gravity is 1, and the weight of all the members attached to the rotating shaft 22 is G, then the weight g of the balance weight 35 is set so that g・1=G・L, The torque required for swinging the swing arm 21 may be reduced.

Furthermore, as shown in FIG. 5A, in the above embodiment,
A bifurcated washer 27 is attached to the protrusion 21c of the swinging arm 21.
However, if you try to immediately rewind from fast forwarding or fast forward from rewinding, there is a risk that the tape will be easily damaged if you reverse it immediately. If the protrusion 21c is pressed by the side surface of the protrusion-like washer 27a as shown, the protrusion-like washer 27a cannot come into contact with the protrusion 21c unless it rotates approximately 360 degrees during the above-mentioned reverse rotation. Due to this time lag, the tape will be properly stretched and will not be damaged.
In order to lengthen the above-mentioned time lag, the washers 27b and 27c are overlapped as shown in FIG. It is sufficient to configure the washer 27c so that it comes into contact with the protrusion 21c after one rotation. It goes without saying that such a time lag mechanism can be incorporated between the pulley 31a and the sun gear 31 to achieve the same purpose.

Reference numeral 36 is a regulating plate that can slide in the same front-back direction as the head stand 2, and as the play arm 20 rotates, it advances forward (upward) against the tension spring 36a. I'm starting to do that. The regulation plate 36 has a V-shaped regulation cam 3.
6b is formed, and as it advances, it fits into the front end of the swinging arm 21 described above, and the swinging arm 21 swings left and right to connect the gear 5 of each reel stand 5, 6.
I try not to mesh with a and 6c.

In FIG. 6, 37 is an operating lever,
The operating lever 37 is rotatably attached to a support pin 1e of the chassis 1 and is biased in a counterclockwise direction by a tension spring 38.
A pin 21d is attached to the rear end of the swing arm 21.
The reference numeral 39 denotes a control lever.
It is rotatably attached to the rotation shaft of the first gear 12, and a pin 39a provided at one end of it abuts against the other end 37b of the operating lever 37.
A pin 3 provided at the other end of the control lever 39
9b abuts against the side surface of the autostop lever 17.

When the swinging arm 21 swings left and right and is in the fast forward or rewind state, the operating lever 37 is positioned as indicated by the chain line, so the control lever 39 is in the free state and the auto stop is activated. Although the lever 17 is free to move, the swing arm 2
When 1 is in the neutral position (solid line state),
The actuating arm 37 and the control arm 39 are also located in the solid line state, and the pin 39b of the control arm 39 is pushing the auto-stop lever 17 counterclockwise.
Auto stop does not work even if the reel stand 6 is stopped.

Next, in FIG. 7, reference numeral 40 denotes an eject lever that is pivotally supported by a pin 1f planted in the side of the chassis 1, and is biased counterclockwise by a tension spring 41. A bent piece 40a is provided at the middle part of the ejector lever 40, and comes into contact with the side projecting piece 2c of the head stand 2.
0 is rotated from the solid line to the chain line position, the head stand 2 slides from the stop position to the eject position. Reference numeral 42 denotes a sub-engine lever, which is rotatably attached to the pin 1g of the chassis 1 and biased clockwise by a tension spring 43. Reference numeral 2d is a release piece formed by bending on the side surface of the head stand 2, and its tip bent piece _2d1 presses the lower part of the sub-eject lever 42 as the cam stand 2 moves as described above. The sub-edge lever 42 is rotated counterclockwise against the tension spring 43. When the sub-engine lever 42 rotates, a hook portion 42a formed at its upper end is disengaged from an engagement piece 44a on the side of the cassette holder 44. The cassette holder 44 is rotatably attached to the pin 1h of the chassis 1, and is urged clockwise by a torsion spring 44b, so that the hook portion 42 of the sub-engine lever 42 can be inserted from the engaging piece 44a thereof.
When a is removed, the cassette holder 44 opens in the chain line state, allowing loading and unloading of cassettes.

45 is a lock plate, pin 1 of chassis 1
i, and is urged counterclockwise by the tension spring 43. The lock plate 4
5 is formed with an engaging claw 45a and a protruding piece 45b, which fit into a slit 2e formed in the head stand 2, and when the cassette holder 44 is opened as shown in the chain line, the protruding piece 45b is in the position shown in the chain line. An engaging claw 45a that protrudes and is also located at the chain line position
The slit 2e of the head stand 2 is locked to keep the head stand 2 at the eject position, and when the cassette holder 44 is closed to the solid line state, its lower plate 44c presses the protruding piece 45b, so that the lock plate 45 rotates to the solid line position, and the engaging claw 45
a disengages from the slit 2e of the head stand 2, and the head stand 2 moves forward, and this time, the slit 2e engages with the protruding piece 45b to hold the head stand 2 at the stop position.

In FIG. 8, reference numeral 46 denotes a cassette holding lever, which is rotatably attached to a pin 1j of the chassis 1 and biased clockwise by a tension spring 47. One end of the lever 46 is a cam surface 46a, and when the head stand 2 is at the eject position indicated by the chain line, the actuating pin 2f installed below the head stand 2 is in contact with it, so that it is at the position indicated by the chain line. Located in
The presser plate 46b integrally provided at the other end is the seventh
As is clear from the figure, it has moved backwards, and the head stand 2
comes to the stop position indicated by the solid line, the above operating pin 2
Since f is removed from the cam surface 46a, the cassette holding lever 46 is rotated to the solid line state by the tension spring 47, and its holding plate 46b presses the back of the cassette.

In FIGS. 8 and 9, 48 is an erroneous erasure prevention lever, and 49 is a chrome tape detection lever, which are independently attached to the pin 1k of the chassis 1 in a loosely fitted state. An erroneous erasure prevention detection claw 48a is formed at one end of the lever 48, and a chrome tape detection claw 49a is formed at one end of the lever 49. 50 and 51 are sliding plates, which are urged upward by tension springs 52 and 53, respectively;
The lower end portions of each of the slide plates 50 and 51 are bent to overlap each other at right angles to the vertical direction, and the lower end portions are engaged with the operating pin 2g of the head stand 2. The upper end of the slide plate 50 is bent, and its abutting surface 50a is opposed to the protrusion 48b at the other end of the accidental erasure prevention lever 48, while the upper end of the slide plate 51 is also bent, The contact surface 51a is provided opposite to the protruding portion 49b of the chrome tape detection lever 49.

Therefore, when the head stand 2 is in the eject position indicated by the chain line, the hanging pins 2g are connected to the respective tension springs 5.
2, 53, the contact surfaces 50a, 51a of the slide plates 50, 51 are sufficiently spaced from the protrusions 48b, 49b of the respective levers 48, 49. As a result, the levers 48 and 49 are positioned as shown in chain lines with the heavier protrusions 48b and 49b facing downward. When the head stand 2 moves forward to the stop position indicated by the solid line, each slide plate 50, 51 moves forward by the tension springs 52, 53, and the lever 48,
The protrusions 48b and 49b of 49 are pressed elastically.

In this embodiment, the play operation switch, recording switch, fast forward switch, rewind switch, pause switch, etc. are all feather touch type, and after each switch is turned on, the first switch is turned on by an electric circuit. It also controls the second motor 8, 32, solenoid 16, etc., and only ejects the
It is designed to be operated mechanically with a lever 40.

Next, the operation will be explained based on the above configuration.

Cassette Loading Operation In FIG. 7, when a cassette is inserted into the cassette holder 44 which is open as indicated by the chain line and the cassette holder 44 is closed as shown in the solid line, the lower surface plate 44c of the holder 44 is inserted into the protruding piece 45 of the lock plate 45.
Push b downward to rotate the lock plate 45 from the chain line state to the solid line state. When the lock plate 45 rotates, the engagement between the slit 2e of the head stand 2 and the engagement claw 45a of the lock plate 45 is disengaged, the head stand 2 moves forward to the left (Fig. 1), and the downward protrusion 2f It comes into contact with the protrusion 20b of the play arm 20 and stops. 8th
As shown in the figure, when the head stand 2 advances from the eject position indicated by the chain line to the stop position indicated by the solid line due to the above-described operation, the heads 2a and 2b are slightly inserted into the window of the cassette. In addition, the head stand 2
As the cassette moves forward, the cassette holding lever 46 also rotates, and its holding plate 46b elastically presses the rear surface of the cassette to fix the cassette. Further, as the head stand 2 moves forward, the slide plates 50 and 51 also slide, and their contact surfaces 50a and 51a elastically press the protrusions 48b and 49b of the levers 48 and 49, respectively, causing the levers 48 and 49 to rotate. try to make it move. However, when the cassette has a erroneous erasure prevention claw or a chrome tape display claw in the rear window, the detection claws 48a and 49a at the ends of the levers 48 and 49 hit the claws, causing the levers 48 and 49 to rotate. On the other hand, it rotates only when the claw is chipped and transmits information to the necessary circuits via appropriate switch means.

In addition, as the head stand 2 moves forward in FIG. 10a, thereby stopping the unit 3. At this time, the pinch roller 3a and the capstan 4a are not in contact with each other.

Play Operation First, when the play switch is turned on, the first motor 8 operates to rotate the flywheel 4 and the pulley 7b of the take-up unit 7 via the belt 9. Further, the solenoid 16 is also energized to attract the lock arm 15, and the lock arm 15 is unlocked from the cam teeth 14b. Then, the cam plate 14c is slightly rotated by the set plate 10, and the third gear 14 is moved to the second gear.
It meshes with gear 13. Since the second gear 13 is rotated by a belt (not shown) wrapped around the flywheel 4, the third gear 14 is rotated by approximately 180 degrees.
rotated by degrees. Due to the rotation of the third gear 14, the large diameter portion of the cam plate 14c is rotated to the roller 2 of the play arm 20.
0a, thereby causing the play arm 20 to rotate and advance the head stand 2 to the play position.

On the other hand, since the notch 10c of the set plate 10 corresponds to the small diameter part of the cam plate 14c, the tension spring 1
Therefore, the extension piece 3d of the pinch roller unit 3 is separated from the protruding piece 10a, and the unit 3 is rotated so that the pinch roller 3a is pressed against the capstan 4a.

Further, when the set plate 10 is pulled, the projection 7d of the take-up unit 7, which is restricted by the front edge 10b, rotates with the movement of the set plate 10 due to the tension spring 7e, thereby causing the pulley 7b to rotate. It comes into contact with the rubber roller of the take-up reel stand 6 and drives the take-up reel stand 6 to rotate.

In addition, during the above play operation, the play arm 20
The regulation plate 36 moves forward, and its V-shaped cam surface 3
6a fits into the front end of the swinging arm 21, the swinging arm 21 is prevented from swinging from side to side, and the swinging gear 24 meshes with the gears 5a, 6c of each reel stand 5, 6. It seems like there is no such thing.

Further, since the mechanical operation of the recording operation is similar to the above-mentioned play operation, the explanation thereof will be omitted below.

Stop operation from play state When the stop switch is turned on, the solenoid 16 is energized, lock arm 15 and cam tooth 1
4b is released, the cam plate 14c rotates a little, and the third gear 14 and the second gear 13 are brought into mesh with each other. As a result, the third gear 14 rotates approximately 180 degrees, so that the play arm 20 returns to its original position and the head stand 2 is returned to the intermediate position. On the other hand, since the set plate 10 is pulled against the force of the tension spring 11, the front edge 10b moves forward, pushing up the protrusion 7d against the force of the tension spring 7e, and the pulley 7b moves against the rubber roller of the take-up reel stand 6. Move away from the take-up reel stand 6.
rotation is stopped. In addition, the set plate 20
When it is pulled, the protruding piece 10a pushes the extension piece 3d of the pinch roller unit 3, so that the unit 3 is rotated and the pinch roller 3a is separated from the capstan 4a.

Rapid forward operation First, when the rapid forward switch is turned on, the second motor 32 operates together with the first motor 8, and the belt 3
3, the pulley 31a is rotated in the direction of the arrow in FIG. When the pulley 31a rotates, the sun gear 31 integrated with the pulley 31a rotates the planetary gear 24, and the disk 23 rotates via the felt 23a pressed against the lower surface of the disk 23, so that the rotating shaft 22 and the swing gear 34 are rotated. Rotate in the direction of the arrow (clockwise). In addition, as the rotating shaft 22 rotates, the first bushing 28 integrated therewith rotates, and the bifurcated washer 27 that is pressed against it is given a rotational force in the same direction as the rotating shaft 22, causing it to oscillate. Protrusion 2 of moving arm 21
Acts on 1c. Therefore, the swing arm 21 receives a rotational force in the direction of the arrow (counterclockwise) about the pin 1d, and presses the rotating swing gear 34 against the gear 6c of the take-up reel stand 6. Rotate 6 at high speed.

Rewinding operation This time, when the rewinding switch is turned on, the second motor 32 rotates in the opposite direction to the above, and the pulley 31a, sun gear 31, planetary gear 24, rotating shaft 22, swing gear 24, etc. All of them are rotated in the direction opposite to the direction of the arrow in FIG. 2, and on the other hand, the swing arm 21 also receives rotational force in the opposite direction by the bifurcated washer 27, so the swing gear 24 rotates counterclockwise at high speed. At the same time, it is engaged with the gear 5a of the supply reel stand 5, and the supply reel stand 5 is rotated at high speed in the rewinding direction (clockwise).

Auto-stop operation from the play state In the play state, the take-up reel stand 6 is rotating, so the bifurcated arm 18 is biased in the direction of the arrow, and the auto-stop lever 17 is also given rotational force in the same direction. The engaging protrusion 17b is pressed against the outer peripheral wall of the eccentric circular groove 12a of the first gear 12. On the other hand, since the first gear 12 is meshed with the second gear 13 and a belt is wound between the second gear 13 and the flywheel 4, the first gear 1
2 is rotating. Therefore, the first gear 12 is rotated with the engagement protrusion 17b in pressure contact with the outer peripheral wall,
The engagement protrusion 17b and the protrusion 12c are never engaged.

When all of the tape is wound up and the rotation of the take-up reel stand 6 stops, the external force that was pressing the engagement protrusion 17b against the outer peripheral wall disappears, so that the engagement protrusion 17b passes through the narrowest groove 12a ₁ . After that, it is held at that trajectory position. On this trajectory there is a protrusion 12c
Since the first gear 12 is rotated, the first gear 12 is engaged with the engagement protrusion 17b. This causes the auto-stop lever 17 to be pulled upward and the stop lever 19 to be pulled. When the stop lever 19 is pulled, the above-mentioned stop switch is turned on.
The first motor 8 is stopped by the stop operation,
The head stand 2 is moved back to the stop position.

Auto-stop operation during fast forwarding During fast forwarding, the take-up reel stand 6 is rotating at high speed in the same direction as in the play state. Therefore, the engaging protrusion 17
b is pressed against the outer peripheral wall of the eccentric circular groove 12a of the first gear 12. When the rotation of the take-up reel stand 6 is stopped, the engagement protrusion 17b and the protrusion 12c are engaged by the same operation as described above, the auto-stop lever 17 is pulled, and the stop switch is activated via the stop lever 19. is turned on.

Auto-stop operation during rewinding During rewinding, the take-up reel stand 6 rotates at high speed in the opposite direction (clockwise) to the play or fast forward state. Therefore, since the auto-stop lever 17 is applied with a rotational force by the bifurcated arm 18 in the opposite direction to that in the above case, the engagement protrusion 17b of the auto-stop lever 17 is
is the cam base 12 in the eccentric circular groove 12a of the first gear 12
b. As a result, while the take-up reel stand 6 is rotating, the first gear 12 is rotated with the engagement protrusion 17b in pressure contact with the cam stand 12b. When the rewinding of the tape is completed and the rotation of the take-up reel stand 6 is stopped, the engagement protrusion 17b is inserted into the narrowest groove portion 1.
After passing through 2a ₁ , it is held at that trajectory position.
Since the protrusion 12c is located on this trajectory,
As the first gear 12 rotates, it is engaged with the engagement protrusion 12c, and the auto-stop lever 17 is pulled, and the stop switch is activated via the stop lever 19.
Turn it on.

Pause Operation During Play As described above, during play, the head stand 2 is in the recording/reproducing position and the take-up reel stand 6 is rotating. Here, when the pause switch is turned ON, the set plate 10 moves slightly upward as shown in FIG. The rotation of the take-up reel stand 6 is stopped by separating it from the rubber roller. Also, set plate 1
0, the pinch roller unit 3 also rotates a little, causing the pinch roller 3a to move a little away from the capstan 4b and stop the tape from running.

In addition, during the above-mentioned pause, the regulation plate 36 moves forward and the V-shaped cam surface 36
a fits into the front end of the swinging arm 21 and restricts the swinging arm 21 to the neutral position, so that the rear end of the swinging arm 21 is connected to the V of the actuating lever 37 as shown in FIG. It engages with the center of the letter-shaped notch 37a and holds the operating lever 37 in the solid line state. Therefore, the control lever 39 is rotated clockwise as shown by the solid line, and its pin 39b presses the side surface of the auto-stop lever 17, causing its engagement protrusion 7d to engage with the eccentric circular groove 12.
Since it is pressed against the outer circumferential wall of a, there is no risk of it engaging with the protrusion 12c, and the auto stop will not work.

However, even during the play operation, the swing arm 21
is regulated to the neutral position and the operating lever 37 is about to be rotated to the solid line position, but since the set plate 10 is lowered to the chain line position, the control lever 37 is not rotated.
9 pin 39b to the step part 1 of the set plate 10.
Since the lever 0c is locked and separated from the auto-stop lever 17, the auto-stop operation is activated.

As described above, in the present invention, the detection claw of the detection lever rotates in the direction away from the cassette due to the weight of the detection lever, so the detection claw does not get caught on the cassette, and also prevents the loading of the cassette. The slide plate that controls the subsequent rotation of the detection lever is biased by a spring in the same direction as the spring bias of the head stand that locks the slide plate, so that the direction of movement when the detection lever rotates is biased. There is no force acting in the opposite direction, so the operation is smooth and there is no risk of malfunction.

In addition, with the present invention, when the tape is loaded and the head stand reaches the intermediate position and the stop mode is entered, the detection lever is rotated and the presence or absence of the accidental erasure prevention claw can be detected, so it is possible to prevent the switch to the recording mode from occurring. Since the tape type can be detected, if the tape type is displayed in the stop mode, recording bias, equalizer, etc. can be set in advance.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the tape recorder, Fig. 2 is a plan view with the chassis removed, Fig. 3 is a vertical sectional view of the fast forward/rewind drive mechanism, and Fig. 4 is a plan view of the fast forward/rewind drive mechanism and other parts. FIGS. 5A, B, and C are explanatory perspective views showing each embodiment of the time lag mechanism incorporated in the drive mechanism, and FIG. 6 shows an auto-stop prevention mechanism during pause. FIG. 7 is a side view showing the ejector and head stand moving mechanism, FIG. 8 is a plan view showing the relationship between the head stand, cassette holder, erroneous erasure prevention detection claw, etc., and FIG. 9 is a side view thereof. It is. 48, 49... Lever, 48a, 49a... Detection claw, 50, 51... Slide plate, 52, 53...
...Tension spring.

Claims (1)

[Claims for Utility Model Registration] Rotatably supported on the chassis, and
A detection claw such as a detection claw for preventing mistaken erasure is formed at one end, and a protrusion that comes into contact with a contact surface of a slide plate, which will be described later, is formed at the other end. A detection lever with a heavy side; a head stand that can take three positions: a backward position when ejecting, an intermediate position when stopping when loading a cassette, and a forward position when recording or playing; a slide plate that is engaged with the slide plate to prevent movement when it is in the backward position, and disengaged and free to move upward when the head stand is in the intermediate position and the forward position; and spring means for always biasing the plate in the same direction as the forward movement direction of the head stand, and when a cassette is loaded and moves forward from the eject position, the head stand moves to the intermediate position and the forward position, and the slide plate engages with the head stand. When the engagement is released, the slide plate is moved upward by the spring means to bring the abutment surface into contact with the protruding part of the detection lever, which causes the detection lever to rotate and the detection claw to engage the cassette. A tape recorder characterized by detecting the presence or absence of a nail such as an accidental erasure prevention nail.