JP2519971Y2 - Tape recorder operation mode setting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention drives a toothless gear by the rotational force of a capstan and waits for a head mounting plate with a head position control cam provided on the toothless gear. In a tape recorder that moves from the position to the playback operation position, the operation mode setting is such that the interruption of the rotation transmission path from the capstan to the reel receiver is also controlled by the head position control cam provided in the toothless gear. Regarding the mechanism.

(Prior Art) In a tape recorder, a capstan gear and a reel gear are provided on a capstan and a reel receiver, respectively.
An intermediate gear is supported on a rotating plate that rotates around the capstan, and the intermediate gear is always meshed with the capstan gear.The rotating plate is rotated to set the intermediate gear to the reel gear. A configuration in which the rotational force of the capstan is transmitted to the reel receiver by engaging with each other has been conventionally known.

Further, there is also a configuration in which the rotating plate and the head mounting plate are engaged with each other, and the intermediate gear meshes with the reel gear in association with the forward movement of the head mounting plate from the standby position to the reproducing operation position. , Is common.

Further, the head mounting plate and the pinch roller supporting member are interlocked with each other, and when the head mounting plate moves from the standby position to the reproducing operation position, the pinch roller is pressed against the capstan in conjunction therewith. The configuration is very commonly used.

(Problems to be solved by the invention) In this case, when the head mounting plate moves forward, the timing at which the pinch roller presses against the capstan and the intermediate gear meshes with the reel gear to transmit the rotational force of the capstan to the reel receiver. It is desirable to match the timing of doing.

This is because if the timing at which the rotational force of the capstan is transmitted to the reel receiver is later than the timing at which the pinch roller is pressed against the capstan, the tape may loosen and become entangled and damaged. On the contrary, if the timing of transmitting the rotational force of the capstan to the reel receiver is earlier than the timing of the pinch roller pressing against the capstan, the tape will be wound up on the reel receiver at high speed, and the first tape start position Goes crazy.

The present invention has been made in view of the above circumstances, and it is possible to reliably match the timing at which the pinch roller is pressed against the capstan and the timing at which the rotational force of the capstan is transmitted to the reel receiver with a simple configuration. It is an object of the present invention to provide an operation mode setting mechanism of a tape recorder that can quickly perform the contact and separation operations of the intermediate gear and the reel gear while interlocking with the operation of the head mounting plate.

(Means for Solving the Problems) The present invention relates to a reel plate which is rotatably provided coaxially with a capstan gear and which is constantly meshed with the capstan gear, and the reel gear is rotated with the rotation of the plate. An intermediate gear that selectively meshes with the capstan gear, and the rotation plate is biased in the rotation direction of the capstan gear by the contact friction with the capstan gear, and the rotation prohibition member always prohibits the rotation. The toothless portion of the toothless gear is provided so as to face the capstan gear so as to be capable of meshing with the capstan gear, a magnetic head is mounted, and it is provided so as to be movable between a standby position and a reproducing operation position. The head mounting plate is engaged with a head position control cam provided on the partly toothless gear to control the movement of the headless plate as the partly toothed gear rotates, and the capstan of the pinch roller is moved according to the position of the head mounting plate. In the operation mode of the tape recorder that controls contact and separation of the head recorder, the rotation mechanism is related to the position of the head mounting plate controlled to move by the head position control cam, particularly to the toothless gear. An arc of equal radius for slidingly contacting a part of the plate to prohibit the rotation of the rotating plate is provided as, for example, a part of a cam integrally formed with the head position control cam on the toothless gear, The rotating plate is removed from the rotation regulation by the equal radius arc portion in accordance with the timing at which the pinch roller comes into pressure contact with the capstan as the mounting plate moves to the reproducing operation position. Is characterized by being engaged with a reel gear.

(Operation) While the head mounting plate is moving from the standby position to the operating position, the pinch roller does not come into pressure contact with the capstan, and the rotating plate is engaged with the equiradius arc portion of the toothless gear. The rotation of the rotary plate in the direction in which the intermediate gear meshes with the reel gear is prohibited, and the intermediate gear and the reel gear do not mesh. Then, when the head mounting plate reaches the reproduction operation position, the rotating plate is quickly rotated by being separated from the arc portion having the equal radius in accordance with the timing when the pinch roller is pressed against the capstan, and the intermediate gear and the reel gear are rotated. Mesh with each other. As a result, the timing when the pinch roller presses the capstan and the timing when the intermediate gear meshes with the reel gear match.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a tape recorder equipped with an operation mode setting mechanism of the present invention, and FIG. 2 is a bottom view of the same. 3. The capstan 4 is rotatably supported and the motor 5 is provided. Reel gears 6 and 7 are respectively connected to the lower end portions of the left and right reel receivers 2 and 3 via a slip rotation transmission mechanism (not shown) so that the tape is not overloaded. A capstan gear 8 is provided at the lower end of the capstan 4 so as to be integrally rotatable with the lower surface of the substrate 1. The capstan gear 8 is provided with a second gear portion 8b having a larger diameter than the first gear portion 8a below the first gear portion 8a. Motor 5
Is rotatable forward and backward, and the number of rotations can be variably controlled. A motor pulley 9 is fixed to the rotation shaft 5a of the rotation shaft 5a, which is located on the lower surface side of the substrate 1. An endless belt is placed between the motor pulley 9 and the capstan pulley 10.
11 is wound. The capstan pulley 10 also functions as a flywheel, is positioned below the capstan gear 8, and is fixed to the lower end of the capstan 4. The rotational force of the motor 5 is the motor pulley 9 and the endless belt.
It is transmitted to the capstan 4 via 11 and the capstan pulley 11.

The capstan 4 is located between the substrate 1 and the capstan 8 and has a fitting hole (not shown) in the center of the rotating plate 12.
Are fitted. Intermediate gears 13 and 14 are rotatably supported on the lower surfaces of both ends of the rotating plate 12. These intermediate gears 13 and 14 are constantly meshed with the second gear portion 8b of the capstan gear 8. The rotating plate 12 is rotationally biased in the rotating direction of the capstan gear 8 by the revolving force generated in the intermediate gears 13, 14 by receiving the rotating force of the capstan gear 8. In addition, a cam slide contact portion 15 that slides in contact with a first annular cam 18 described later is provided on one end side of the rotating plate 12. The rotation limit position of the rotation plate 12 in the forward and reverse directions is regulated by contact of the rotation plate 12 with the stoppers 16a and 16b provided on the lower surface side of the substrate 1, and the rotation limit of the rotation plate 12 is limited. At the position, the intermediate gears 13 and 14 selectively engage with the corresponding reel gears 6 and 7, respectively. The toothless gear 17 meshes with the first gear portion 8a of the capstan gear 8. This missing gear 17
Has a toothless portion 17a in a portion extending over approximately 180 ° and a toothed portion 17b in the remaining portion, and is rotatably supported on the lower surface of the substrate 1. This partly tooth-missing gear 17 has a fourth
As shown in the figure, it has first and second annular cams 18 and 19, and
As shown in FIG. 2, the lower surface has an annular groove 20. The first annular cam 18 has an equal radius arc portion 18a provided over a range of approximately 180 °, and a diameter smaller than the equal radius arc portion 18a of approximately 150 °.
The small circular arc portion 18b is provided over the range and the equal radius circular arc portion 18a and the inclined portions 18c and 18d provided so as to connect the both ends of the small circular arc portion 18b. Then, the cam sliding contact portion 15 of the rotating plate 12 is brought into sliding contact with the equal radius arc portion 18a of the first annular groove 18, whereby the intermediate gear of the rotating plate 12 is moved.
Rotation in the direction of meshing 13, 14 with the reel gears 6, 7 is prohibited. Further, the cam sliding contact portion 15 of the rotating plate 12 is an arc portion having an equal radius.
By sliding on the small arc portion 18b via the inclined portions 18c, 18d separated from the 18a, the rotation plate 12 is allowed to rotate in the direction in which the intermediate gears 13, 14 are meshed with the reel gears 6, 7. It The second annular cam 19 is a head position control cam,
From the other end of the first circular arc portion 19a, which is provided over the range of 240 ° and whose distance from the rotation center of the partly tooth-missing gear 17 gradually increases from the one end side to the other end side. A second arcuate portion 19b which is provided over a range of about 80 ° and whose distance from the rotation center of the partly tooth-missing gear 17 is gradually shortened from one end side to the other end side, and the other end of the second arcuate portion 19b. And a substantially V-shaped inclined portion 19c provided so as to connect between the first circular arc portion 19a and one end of the first circular arc portion 19a. The cam slide contact pin 22 of the head mounting plate 21 is in sliding contact with the second annular cam 19. The head mounting plate 21 can be moved in the directions of arrows A and B so that the standby position (stop, fast-forward and rewind operation positions), the reproduction operation position, and the cueing operation position can be selectively set on the upper surface of the substrate 1. Is attached to. The head mounting plate 21 is the substrate 1
The main body 23 mounted on the upper surface of the body so as to be movable in the directions of arrows A and B
And the arrow A on the upper surface of the substrate 1 located below the main body 23,
It is composed of a sub body 24 mounted so as to be movable in the B direction. Subject 2
The 3 and the sub body 24 are connected by a first coil spring 25 so as to attract each other. The first coil spring 25 has one end in the spring hook hole 26 of the main body 23 and the other end in the spring hook piece of the sub body 24.
It is hung on 27 respectively. The limit position of the main coil 23 and the sub body 24 with respect to the approaching direction by the first coil spring 25 is the edge portion 28a of the hole 28 of the main body 23 and the spring hook projection 2 of the sub body 24.
It is regulated by contact with 9. On the upper surface of the main body 23,
A recording / playback (recording / playback) head (magnetic head) 30 and an erasing head (magnetic head) 31 are screwed together via a spacer 32 made of synthetic resin, and a wire clamper 32a is integrally formed on this spacer 32. ing. The sub body 24 is provided with a cam slide contact pin 22, and the upper and lower ends of the cam slide contact pin 22 are the sub body.
It projects from the upper and lower surfaces of 24. And the cam sliding contact pin 22
The upper end of the cam sliding contact pin 22 is movably fitted in the elongated hole 33 of the main body 23, and the lower end of the cam sliding contact pin 22 is in sliding contact with the second annular cam 19 of the toothless gear 17. The head mounting plate 21 is biased by the second coil spring 34 in the arrow B direction (standby position direction). The second coil spring 34 is located below the first coil spring 25, and has one end hooked on the spring hook 27 of the sub body 24 of the head mounting plate 21 and the other end hooked on the spring hook 35 of the substrate 1. It has been stopped.
A support member 37 that rotatably supports a pinch roller 36 is rotatably mounted on a top surface of the substrate 1 by a shaft 38. A head mounting plate is mounted on the support member 37 via a torsion spring 39.
It is engaged with 21 sub-members 24. The torsion spring 39 is arranged at the position of the hole 28 of the main body 23, and the central coil portion 39a is the first spring hooking piece 40 of the sub body 24 and the one side 39b is the sub body.
The other side 39c of the second spring hooking piece 41 of 24 is hooked on the spring hooking projection 29 of the sub body 24. Further, the tip portion 39d of the other side 39c of the torsion spring 39 is engaged with the support member 37 of the pinch roller 36. Then, as the tooth-chipped gear 17 rotates, the sliding contact position of the cam sliding contact pin 22 of the head mounting plate 21 with respect to the second annular cam 19 changes, so that the head mounting plate 21 is in the standby position and the reproduction operation position. And the cueing operation position is controlled alternatively. That is, when the cam sliding contact pin 22 is located at the position of the second annular cam 19 where the distance from the rotation center of the tooth-chipped gear 17 is the longest (near one end of the second arc portion 19a), the head mounting plate 21 is It becomes the standby position and the recording / playback head 30
The erasing head 31 does not contact the tape 42a in the tape cassette 42, and the support 37 rotates clockwise in FIG. 1 to separate the pinch roller 36 from the capstan 4. When the cam sliding contact pin 22 is located at the shortest distance of the second annular cam 19 from the rotation center of the tooth-chipped gear 17 (near one end of the first arc portion 19a), the head mounting plate 21 is At the reproducing operation position, the recording / reproducing head 30 and the erasing head 31 come into contact with the tape 42a in the tape cassette 42, and the urging force of the torsion spring 39 causes the support body 37 to rotate counterclockwise in FIG. Then, the pinch roller 36 is pressed against the capstan 4. Further, the cam sliding contact pin 22 has the second annular groove 19 and the toothless gear.
When the virtual ground from the rotation center of 17 is located at the second shortest position (near the other end of the second arc portion 19b), the head mounting plate 21
Is the cueing operation position, and the recording / reproducing head 30 and the erasing head 31
Comes into contact with the tape 42a in the tape cassette 42,
The support 37 is rotatably held at a position where the pinch roller 36 is slightly separated from the capstan 4. The annular groove 20 has a predetermined interval in the circumferential direction on the inner peripheral side, and has the first, second, third engaging portions 43, 44,
In addition to having 45, the first and second inclined surfaces 46 and 47 are provided on the outer peripheral side at a predetermined interval in the circumferential direction. An engagement pin 49 protruding from the upper surface of one end of a trigger arm (rotation inhibiting member) 48 for inhibiting rotation of the tooth-chipped gear 17 is slidably engaged with the annular groove 20. The trigger arm 48 has a substantially middle portion rotatably supported on the lower surface of the substrate 1 by a shaft 50. The trigger arm 48 is connected to an outer end portion of an iron core 52 of an electromagnet (lock release means) 51. When the electromagnet 51 is off, the trigger arm 48 is rotated in the clockwise direction in FIG. 2 via the iron core 52 by the spring (not shown), that is, the engagement pin 49 moves to the first to third engagement portions.
It is biased in a direction to engage with 43 to 45. By engaging the engagement pin 49 with the first engagement portion 43, the tooth-chipped gear 17 is prohibited from rotating at the rotation position where the head mounting plate 21 is at the standby position. Further, the engagement pin 49 engages with the second engagement portion 44, so that the tooth-chipped gear 17 is prohibited from rotating at the rotation position where the head mounting plate 21 is at the reproduction operation position. Further, the engagement pin 49 engages with the third engagement portion 45, whereby the tooth-chipped gear 17
Is prohibited from rotating at the rotation position where the head mounting plate 21 is at the cueing operation position. The engagement pin 49 has the first to third engagement portions 43.
When the electromagnet 51 is turned on in a state where it is engaged with ~ 45 and rotation of the partly tooth-missing gear 17 is prohibited, the trigger arm 48 rotates counterclockwise in FIG. 2 via the iron core 52 against the spring force. By the movement, the engagement pin 49 moves the first to third engagement portions 43 to 45.
The tooth-missing gear 17 is allowed to rotate by coming off. The engagement pin 49 slips out of the first engagement portion 43 and comes into sliding contact with the first inclined surface 46, whereby the toothless gear 17 is initially rotated, and the toothed portion 17b thereof is attached to the intermediate gear 13 or 14. It becomes possible to mesh. The electromagnet 51 is arranged in an opening 53 provided on one side of the substrate 1. A pair of support shafts 54, 55 for supporting the front of the tape cassette 42 are provided on the upper surface of the substrate 1 located on both sides of the capstan 4 so as to project therefrom. Further, a guide shaft 56 that guides the movement of the head mounting plate 21 in the directions of arrows A and B is provided on the upper surface of the front side substantially intermediate portion of the substrate 1, and the main shaft 23 of the head mounting plate 21 is guided by the guide shaft 56. Engagement notch between sub body 24 and
57 is slidably engaged. The guide shaft 56 also has a function of supporting the rear of the tape cassette 42. Guide shaft
The tape cassette is located on the upper surface of the substrate 1 located near 56.
A leaf spring 57 is provided for pressing 42 toward the recording / reproducing head 30. The reproduction operation position of the head mounting plate 21 is regulated by the contacted portion 24a of the sub body 24 contacting the peripheral side surface of the one support shaft 54. A damper rubber 58 is provided on the upper surface of the rear side substantially intermediate portion of the substrate 1. Then, when the head mounting plate 21 returns from the reproduction operation position or the cueing operation position to the standby position, it comes into contact with the dieper rubber 58 to be buffered.
A printed board 59 is provided on the front lower surface of the board 1. On this printed circuit board 59, the rotation detecting element 60 for detecting the rotation of the reel receivers 6, 7 and the head mounting plate 21 are in the standby position,
A position detection switch 61 for detecting the reproduction operation position and the cueing operation position, the motor 5, and the electromagnet 51.
Terminal (not shown) for connecting the lead wire (not shown) of
And a connector 62 for collectively energizing them.

Next, the operation of the mode setting mechanism will be described as the operation of the tape recorder having the above configuration. 1 to 3 show a stopped state. In this stopped state, as shown in FIG. 1, the head mounting plate 21 is in the standby position, the pinch roller 36 is separated from the capstan 4, and the recording / reproducing head 30
The erasing head 31 is also in a position where it does not contact the tape 42a in the tape cassette 42. Further, the electromagnet 51 is turned off, and the engagement pin 49 of the trigger arm 48 is engaged with the first engagement portion 43 of the annular groove 20 of the tooth-chipped gear 17 as shown in FIG. The rotation of the tooth gear 17 is prohibited. Further, as shown in FIG. 3, the cam sliding contact pin 22 of the sub body 24 of the head mounting plate 21 is located at the longest distance from the rotation center of the toothless gear 17 of the second annular cam 19 of the toothless gear 17. That is, the second arc portion 19b
Is located near one end of the. Further, as shown in FIG. 3, the cam sliding contact portion 15 of the rotating plate 12 has the first annular cam of the toothless gear 17.
The small circular arc portion 18b of 18 and the other inclined portion 18d are located slightly apart from each other, and the rotary plate 12 is provided with one stopper 16a.
, The one intermediate gear 13 meshes with the one reel gear 6, and the first gear portion 8a of the reel gear 8 does not mesh with the toothed portion 17b of the tooth-chipped gear 17.

(Fast-forwarding operation) In such a stopped state, when the tape cassette 42 is loaded at a predetermined position and then a fast-forwarding operation member (not shown) is operated, the motor 5 is rotated at a high speed in the counterclockwise direction indicated by an arrow in FIG. The rotation of the motor 5 is transmitted to the capstan 4 and the capstan gear 8 via the motor pulley 9, the endless belt 11, and the capstan pulley 10, and the capstan 4 and the capstan gear 8 move at high speed in the arrow direction in FIG. The capstan gear 8 is rotated, and the second gear portion of the capstan gear 8 is further rotated.
Both of the intermediate gears 13 and 14 are rotated at a high speed in the direction of the arrow in FIG.
The reel gear 6 (on the right side in the drawing and on the left side in FIG. 1) is rotated at a high speed integrally with the reel receiver 2 and is loaded in the tape cassette.
The tape 42a in 42 is wound at high speed from the reel receiving side 7 on the right side in FIG. 1 toward the reel receiving side 6 on the left side.

(Rewinding operation) When a rewinding operation member (not shown) is operated, the motor 5 is rotated at high speed in the clockwise direction in FIG.
Rotation of the capstan 4 and the capstan gear 8 via the motor pulley 9, the endless belt 11, and the capstan pulley 10.
The capstan 4 and the capstan gear 8 are rotated in the clockwise direction in FIG. 2 at a high speed, and accordingly, the rotary plate 12 is rotated in the clockwise direction in FIG. 2 until it comes into contact with the other stopper 16b. When rotated, the other (left in FIG. 2) intermediate gear 14 meshes with the other (left in FIG. 2, right in FIG. 1) reel gear 7. Both the intermediate gears 13 and 14 are rotated at high speed via the second gear portion 8b of the reel gear 8, and the other reel gear 7 meshing with the other intermediate gear 14 is rotated at high speed integrally with the reel receiver 3 to be loaded. Tape 42 in a tape cassette 42
The a is wound at a high speed from the left reel receiver 2 side in FIG. 1 toward the right reel receiver 7 side.

(Recording or Reproducing Operation) In the stopped state shown in FIGS. 1 to 3, after the tape cassette 42 is loaded at a predetermined position and the recording operation member or reproduction operation member (not shown) is operated, the motor 5
Rotates at a constant speed in the counterclockwise direction in FIG. At the same time 1
When the electromagnet 51 is turned on by the ON signal of the pulse, the trigger arm 48 rotates counterclockwise in FIG. 2, and its engagement pin 49 makes the first engagement of the annular groove 20 of the tooth-chipped gear 17. At the same time as coming off from the portion 43, it comes into contact with the first inclined surface 46.
As a result, an initial rotational force in the clockwise direction in FIG. 2 is applied to the tooth-chipped gear 17, the tooth-chipped gear 17 rotates, and its toothed portion 17b becomes the first gear portion 8a of the capstan gear 8. Mesh. Therefore, the partly tooth-missing gear 17 is rotated clockwise by the rotational force of the first gear portion 8a in FIGS. 2 and 3. As the tooth-missing gear 17 rotates, the first annular cam 18 rotates integrally therewith, so that the cam sliding contact portion 15 of the rotating plate 12 passes through the other inclined portion 18d of the first annular cam 18. , Equal radius arc part 18a
The sliding plate 12 is rotated in the clockwise direction in FIGS. 2 and 3 by slidably contacting the intermediate gear 1 as shown in FIG.
The state in which 3,14 does not mesh with both reel gears 6,7 is set. In addition, as the tooth-chipped gear 17 rotates, it is integrally formed with the second annular cam.
The rotation of 19 causes the cam sliding contact pin 22 of the sub-pair 24 of the head mounting plate 21 to slidably contact the first circular arc portion 19a from the other end side toward the one end side. As a result, the head mounting plate 21 moves in the direction of arrow A in FIG. 1 against the biasing force of the second coil spring 34. As the engagement gear 49 of the trigger arm 48 is engaged with the second engagement portion 44 of the annular groove 20 as the rotation of the tooth-chipped gear 17 progresses, the cam sliding contact portion 15 of the rotating plate 12 moves to the first position. As shown in FIG. 5, the first annular cam 18 is separated from the equal radius arc portion 18a. When the engagement pin 49 of the trigger arm 48 engages with the second engagement portion 44 of the annular groove 20, the toothless gear 17 has its toothed portion 17 meshed with the first gear portion 8a of the capstan gear 8. In that state, the rotation thereof is prohibited, and the rotating plate 12 rotates counterclockwise in FIG. 5 so that one intermediate gear 13 meshes with one reel gear 6 (state of FIG. 6). . In addition, the engagement pin 49 of the trigger arm 48 is attached to the annular groove 20.
When the second sliding portion 44 is engaged, the cam sliding contact pin 22 of the head mounting plate 21 slides into contact with one end of the first circular arc portion 19a of the second annular cam 19 as shown in FIG. The head mounting plate 21 is moved in the direction of arrow A as much as possible to reach the reproducing operation position, the recording / reproducing head 30 and the erasing head 31 contact the tape 42a in the tape cassette 42, and the pinch roller 36 press-contacts the capstan 4. (State of FIG. 7). Therefore, the tape 42a is wound at a constant speed from the reel receiving side 7 on the right side to the reel receiving side 6 on the left side in FIG. 7, and the recording or reproducing operation is performed.

(Cueing operation) When, for example, a rewinding operation member (not shown) is operated from the recording or reproducing operation state shown in FIGS. 6 and 7, the motor 5 rotates at high speed in the clockwise direction in FIG. 12 rotates clockwise in FIG. 6 so that the other intermediate gear 14 meshes with the other reel gear 7 as shown in FIG. At the same time, the electromagnet 51 is turned on by a one-pulse ON signal, whereby the trigger arm 48 rotates counterclockwise in FIG. 6, and the engagement pin 49 of the trigger arm 48 rotates in the annular groove 20 of the tooth-chipped gear 17.
It disengages from the second engaging portion 44. Then, this missing tooth gear 17
When the cam sliding contact pin 22 of the head mounting plate 21 is in sliding contact with the second annular cam 19, the rotating shaft rotates clockwise in FIG. With the rotation of the tooth-chipped gear 17, the engagement pin 49 of the trigger arm 48 contacts the second inclined surface 47 of the annular groove 20. Due to this abutment, the engagement pin 49 causes the third engagement portion 45 of the annular groove 20.
The forced movement is performed so as to engage with. Then, as the engagement pin 49 becomes engaged with the third engagement portion 45 as shown in FIG. 8, the cam slide contact pin 22 of the head mounting plate 21 becomes the second annular cam as shown in FIG. The head mounting plate 21 is slightly moved in the direction of arrow B by the urging force of the second coil spring 34 because it is in sliding contact with the other end of the second circular arc portion 19b via the inclined portion 19c of 19. The state shown in FIG. 9 is obtained. In this state, the pinch roller 36 is slightly separated from the capstan 4, but the recording / reproducing head 30 and the erasing head 31 are
The tape 42a in 42 is in light contact with it. Therefore, tape 4
2a is wound at a high speed from the left reel receiver 2 side in FIG. 9 toward the right reel receiver 3 side. When the rewinding operation is performed in the reproducing operation state, for example, a non-recording portion between songs is detected, the electromagnet 51 is turned on by the detection signal, and the rotation of the motor 5 is stopped. After returning to the standby position, the reproducing operation can be started from the beginning of the music by the next reproducing operation.

If you perform a fast-forward operation in the playback mode,
The reproduction operation will be started from the beginning of the next song.

In the cueing operation of this embodiment, the reels 2 and 3 can be received by switching the rotation direction of the motor 5.
Since any of the above can be rotated, after listening to the message of the answering machine, it can be rewound to prepare for the next recording operation.

(Effect of the Invention) As described above, according to the present invention, the timing at which the pinch roller is pressed against the capstan and the timing at which the rotational force of the capstan is transmitted to the reel receiver can be reliably matched with a simple configuration. At the same time, there is an effect that the intermediate gear and the reel gear can be quickly brought into and out of contact with each other while having an interlocking relationship with the operation of the head mounting plate.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a plan view of a tape recorder having an operation mode setting mechanism of the present invention in a stopped state, FIG. 2 is a bottom view of the same, and FIGS. 7 is a plan view of the reproducing operation state of the tape recorder of FIG. 1, FIG. 8 is an explanatory view of the cueing operation state, and FIG. 9 is a cueing operation state of the tape recorder of FIG. It is a top view. 2,3 …… Reel holder, 4 …… Capstan, 6,7 …… Reel gear, 8 …… Capstan gear, 12 …… Rotating plate, 13,1
4 …… Intermediate gear, 17 …… Toothless gear, 17a …… Toothless portion, 18a
…… Equal radius arc part, 19 …… Second annular cam (head position control cam), 21 …… Head mounting plate, 30 …… Recording / reproducing head (magnetic head), 31 …… Erasing head (magnetic head), 36 ......
Pinch roller, 37 ... Support member, 48 ... Trigger arm (rotation prohibition member), 51 ... Electromagnet (lock release means).

Claims (2)

(57) [Scope of utility model registration request] 1. A reel gear (6) which is constantly meshed with a rotating plate (12) which is rotatably provided coaxially with the capstan gear (8) and which rotates with the rotating plate. , 7)
An intermediate gear (13.14) that selectively meshes with the capstan gear is provided, and the rotating plate is rotationally biased in the rotational direction of the capstan gear by the revolution force of the intermediate gear that receives the rotational force of the capstan gear. Is provided with a toothless part of the toothless gear (17) whose rotation is prohibited by the rotation inhibiting member (48) so as to face the capstan gear so as to be meshable with the capstan gear, a magnetic head is mounted, and a stand-by state is provided. The head mounting plate (21) provided so as to be movable between the position and the reproduction operation position is engaged with the head position control cam (19) provided on the toothless gear so that the toothless gear rotates. In the operation mode setting mechanism of the tape recorder, the operation mode is set by controlling the movement of the pinch roller (36) with respect to the capstan (4) according to the moving position of the head mounting plate. Equal radius arc (18a) is provided, and when the head mounting plate is in the middle of moving from the standby position to the reproducing operation position, a part (15) of the rotating plate is brought into contact with the equal radius arc portion, The operation mode setting mechanism for a tape recorder, wherein the rotation of the intermediate gear in the direction of meshing with the reel gear is prohibited. 2. The operation mode setting mechanism for a tape recorder according to claim 1, wherein the equal radius arc portion forms a part of a cam integrally formed with the head position control cam.