JPH0658747B2 - Operation mechanism of tape recorder - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an operation mechanism of a tape recorder, and more particularly to an operation mechanism of a tape recorder having a movable power supply operation member.

(Technical background of the invention and its problems) As an operation mechanism of a tape recorder, there is known an operation mechanism having an operation switch for mode setting and a power operation switch for switching a power source. This operation switch is slidably attached to the main body of the tape recorder, and is moved to each mode setting position such as reproduction, stop, and recording. Similarly, the power supply operation switch is slidably attached to the main body of the tape recorder, and is moved to an ON position for turning on the power supply, an OFF position for turning off the power supply, and an eject position for ejecting the tape cassette. Normally, the power operation switch is movable only when the operation switch is in the stop mode setting position. When the power operation switch moves to the OFF position, it separates the pinch roller and the magnetic head from the magnetic tape to a position that does not hinder the ejection of the tape cassette. Further, the power operation switch is moved from the OFF position to the eject position to eject the tape cassette in a state where the pinch roller and the magnetic head are separated from the magnetic tape.

However, the pinch roller lever that supports the pinch roller and the head lever that supports the magnetic head are biased in the magnetic tape direction by the biasing members, and in particular, the biasing member for biasing the pinch roller is relatively The one with strong bias is used. The power operation switch is moved from the OFF position to the eject position while the pinch roller lever and the head lever are pressed in the direction of separating from the magnetic tape. Therefore, the power operation switch moves while receiving the lateral pressure by the biasing member. To do.
Therefore, there is a problem that the operation of the power supply operation switch becomes heavy, and it is difficult to smoothly switch the power supply and eject the tape cassette.

(Object of the Invention) The present invention has been made in view of the above points, and an object thereof is to lightly operate a power supply operating member and to smoothly switch the power supply of a tape recorder and eject a tape cassette. It is to provide an operation mechanism of a tape recorder.

(Summary of the Invention) In order to achieve the above object, according to the operating mechanism of the present invention, an urging member for urging a pinch roller lever supporting a pinch roller, a stop mode setting position, and a reproduction mode setting position are provided. A mode setting operation member movably provided between the operation member, an engagement member engaged with the biasing member and the operation member, and a power source of the tape recorder when the operation member is in the stop mode setting position. Power ON to turn on
Power OFF to turn off the position and power of the tape recorder
And a power supply operating member movably provided between a position and a cassette eject position for ejecting the tape cassette, and this engaging member is provided when the operating member is located at the reproduction mode setting position. When the urging member is pressed to apply the urging force that presses the pinch roller lever in the capstan direction to the urging member and prevents the movement of the power supply operating member, the activating member is applied when the operating member is in the stop mode setting position. The urging force of the urging member is released and the movement of the power source operating member is allowed.

Embodiments of the Invention Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 show a tape recorder provided with an operating mechanism according to an embodiment of the present invention. As shown in FIGS. 1 and 2, this tape recorder has a base 1
It has a 0 and a capstan 1 on the top of this base.
2, first to fourth support shafts 14, 15, 16, 17,
The support post 18, the guide pin 20, and the pair of guide posts 22 are erected. A rectangular opening 24 is formed in the board 10. A head lever 28, which supports a magnetic head 26, is rotatably supported on the first support shaft 14. A locking pin 30 is provided at the left end of the head lever, and a pressing pin 31 is provided at the right end thereof. As can be seen from FIG. 2, a torsion coil spring 34 is wound around the support pin 32 erected on the upper surface of the base 10, one end of which is inserted into a hole 35 formed in the base and the other. The ends are respectively hooked on the locking pins 30 of the head lever. As a result, the head lever 28
Is urged counterclockwise around the support shaft 14.

A substantially U-shaped pinch roller lever 36 is rotatably supported on the support shaft 15 and is located above the head lever 28. The pinch roller lever 36 has a pinch roller 38
Is rotatably supported. Pinch roller lever 36
Has an extension part extending leftward, and the extension end of this extension part is bent downward to form a bent piece 39. The bent piece 39 projects through the opening 24 to the lower surface of the substrate 10. On the side surface of the pinch roller lever 36, a pair of elongated holes 40 and 41 are formed and a locking piece 42 is attached. Further, a torsion coil spring 44 as an urging member in the present invention is wound around the support shaft 15. One end 45 of the spring 44 extends from the pinch roller lever 36 through the elongated hole 40, and the extending end is bent downward. The other end 46 of the spring 44 extends through the elongated hole 41 and the locking piece 42.

An operation switch 48 as an operation member is slidably attached to the base 10. The operation switch 48 includes an operation plate 54 formed of an upper plate 50, an intermediate plate 51, a lower plate 52, and a side plate 53 connecting the plates, which are positioned in parallel with each other, and an operation button 5 fitted to the side plate of the operation plate.
5 and 5. The middle plate 51 has an elongated guide hole 56.
Is formed, and the guide pin 20 of the base 10 is inserted into this guide hole. Thereby, the operation switch 48 is slidably mounted on the base 10, and the lower plate 52 is located on the lower surface side of the base. The middle plate 51 has a protruding portion 57 that can come into contact with the locking pin 30 of the head lever 28.
And a protrusion 58 engageable with the other end 46 of the torsion coil spring 44. An edge of the upper plate 50 on the side of the head lever 28 forms a guide edge 60 for guiding a guide roller of an engagement lever described later, and a recess 61 is formed in the center of the guide edge. There is. Also, the side plate 53
An opening 65 is formed at the opposite side of the operation button 55.

The operation switch 48 is slid between a reproduction mode setting position, a stop mode setting position, a recording mode setting position, and a REV mode setting position, as described later. The operation button 55 has three engagement grooves 62, 6 formed side by side in a portion facing the opening 65 of the operation plate 54.
3, 64, and these engaging grooves are formed respectively corresponding to the reproduction mode setting position, the stop mode setting position, and the recording mode setting position. Also, the base 10
One end of a leaf spring 66 is fixed to the side wall 10a of the plate spring, and the leaf spring extends between the upper plate 50 and the middle plate 51 of the operation plate to the vicinity of the opening 65. Leaf spring 6
A roller 67 is rotatably attached to the other end of the roller 6, and is biased by a leaf spring to elastically engage with one of the engaging grooves 62, 63, 64 through the opening 65. ing. As a result, the operation switch 48 is held at each mode setting position, and these engaging grooves 62, 63,
The 64, the leaf spring 66 and the roller 67 constitute a holding means.

An engagement lever 68 as an engagement member of the present invention is rotatably supported on the support shaft 16 of the base 10 and is located between the upper plate 50 and the middle plate 51 of the operation plate 54. A guide roller 70 that engages with the guide edge 60 of the operation plate 54 is mounted on the engagement lever 68. A torsion coil spring 71 is wound around the support shaft 16, and one end of the spring is a support post 18 of the board 10.
The other end is hooked on the engaging lever 68.
As a result, the engagement lever 68 is urged in the clockwise direction around the support shaft 16 by the spring 71 and abuts on the one end portion 45 of the torsion coil spring 44. 2 shows the stop mode of the tape recorder. In the stop mode, the guide roller 70 of the engaging lever 68 is shown.
About half of which is located in the recess 61 of the operation plate 54.

As shown in FIGS. 1 and 3, the support shaft 1 of the base 10
7, a pressing cam 72 and a holding lever 74 are rotatably supported, and the pressing cam is formed so as to come into contact with the pressing pin 31 of the head lever 28 by rotating. Further, a torsion coil spring 75 is wound around the support shaft 17, and one end of this spring is at the base 1
No. 0 side wall 10a and the other end of the bent portion 7 of the holding lever 74.
It is multiplied by 6 respectively. As a result, the holding lever 74 is biased in the counterclockwise direction around the support shaft 17 by the spring 75. A pair of engaging recesses 74a and 74b are formed on the right side edge of the holding lever 74.

A power source operation plate 78 as a power source operation member for switching the power source of the tape recorder is slidably disposed above the operation switch 48. That is, the operation switch 48
Above the floor, the support posts 18 and side walls 10 of the base 10 are
A support plate 80 fixed to a is provided, and a power source operation plate 78 is slidably mounted on the support plate 80. A pair of guide pins 81 for guiding the power supply operation plate 78 are attached to the support plate 80, and a long hole 82 located above the pressing cam 72 is formed. A kick pin 83 that presses the pressing cam 72, an engagement pin 84 that engages with the side edge of the holding plate 74, and a lock arm 85 extend downward from the power source operation plate 78. The lock arm 85 is
When the tape recorder is set to a mode other than the stop mode, it abuts the rear end of the engagement lever 68 to prevent the power supply operation plate 78 from moving. The power operation plate 78 holds the power OFF position where the engagement pin 84 engages with the engagement recess 74a of the holding lever 74, the power ON position where the engagement pin engages with the engagement recess 74b, and the holding position. The shoulders 78a, 78b of the plate are moved to and from the cassette eject position where they abut the guide pin 81.

Next, the operation of the operation mechanism configured as described above will be described.

First, in the stop mode shown in FIG. 2 and FIG. 3, the operation switch 48 has the engagement groove 63 of the operation button 55.
Is engaged with the roller 67, and the guide roller 70 of the engagement lever 68 is located in the recess 61 of the operation switch 48. In addition, the protruding portion 57 of the operation switch 48
Is in contact with the locking pin 30 of the head lever 28.
As a result, the head lever 28 moves the torsion coil spring 3
The magnetic head 26 is rotated clockwise against the urging force of the magnetic head 4 and is located between a contact position and a retracted position described later, and the magnetic head 26 is separated from a magnetic tape (not shown). The pinch roller lever 36 is rotated clockwise around the support shaft 15 by pressing the bent piece 39 of the pinch roller 39 against the left end of the head lever 28, and is positioned between a pressing position and a non-pressing position described later. The pinch roller 38 is separated from the capstan 12. Further, the engagement lever 68 is in the state shown in the drawing in which the guide roller 70 is located in the recess 61 of the operation switch 48, and does not press the end portion 45 of the torsion coil spring 44. Therefore, the torsion coil spring 44 is in an unloaded state and does not bias the pinch roller lever 36.

As shown in FIG. 4, when the operation switch 48 is moved to the reproduction mode setting position where the roller 67 engages with the engagement groove 62 of the operation button 55, the protrusion 57 of the operation switch causes the protrusion 57 of the operation switch to engage with the locking pin of the head lever 28. Separated from 30. As a result, the head lever 28 is biased by the torsion coil spring 34 to rotate counterclockwise to the contact position, and the magnetic head 26 contacts the magnetic tape (not shown). Further, the guide roller 70 of the engagement lever 68 is pressed by the side edge of the upper plate 50 of the operation plate 54 and moves from the recess 61 to the guide end edge 60. Thereby, the engagement lever 68
Rotates clockwise around the support shaft 16 and presses one end 45 of the torsion coil 44, so that the other end 46 of the torsion coil spring 44 urges counterclockwise around the support shaft 16. To be done. Then, the other end 46 of the torsion coil spring is
Pushes the locking piece 42 of the pinch roller lever 36 toward the capstan 12 and rotates the pinch roller lever 36 counterclockwise to the pushing position. Therefore, while the pinch roller 38 contacts the capstan 12,
A predetermined pinch pressure is applied to the pinch roller by the torsion coil spring 44. Thereby, the reproduction mode of the tape recorder is set.

Next, as shown in FIG. 5, when the operation switch 48 is moved from the reproduction mode setting position to the position where the guide pin 20 of the board 10 contacts the right end of the guide hole 56 of the operation switch, the REV mode of the tape recorder is changed. Is set. That is, when the operation switch 48 is moved to the left from the reproduction mode setting position, the roller 67 disengages from the engagement groove 62 and the holding force of the operation switch is released. Further, the projection 58 of the operation switch 48 comes into contact with the end portion 46 of the torsion coil spring 44 and deforms the end portion 46 in a direction away from the other end portion 45. As a result, the end portion 46 of the torsion coil spring 44 is separated from the locking piece 42 of the pinch roller lever 36, and the pinch pressure applied to the pinch roller 38 is
It becomes zero. Here, the end portion 45 of the torsion coil spring is
Since it abuts on the engagement lever 68 and is prevented from moving, a sufficient biasing force is stored in the end portion 46. Therefore, when the operating force applied to the operating switch 48 is released, the operating switch is urged by the end portion 46 to be moved to the reproduction mode setting position, and the pinch roller lever 36 moves through the locking piece 42. The pinch roller 38 is urged by the end portion 46 and pressed against the capstan 12.
Thereby, the reproduction mode is automatically set.

As shown in FIG. 6, when the operation switch 48 is moved from the above-described stop mode setting position to the recording mode setting position where the roller 67 engages with the engagement groove 64 of the operation button 55, the protruding portion 57 of the operation switch is released. It is separated from the locking pin 30 of the head lever 28. As a result, the head lever 28 is biased by the torsion coil spring 34 to rotate counterclockwise to the contact position, and the magnetic head 26 contacts the magnetic tape (not shown). Further, the guide roller 70 of the engagement lever 68 is pressed by the side edge of the upper plate 50 of the operation plate 54 and moves from the recess 61 to the guide end edge 60. As a result, the engagement lever 68 rotates clockwise around the support shaft 16 to rotate the one end portion 45 of the torsion coil spring 44.
, Which results in the other end 4 of the torsion coil spring 44
6 is biased counterclockwise about the support shaft 16. Then, the other end portion 46 of the torsion coil spring is connected to the pinch roller 3
The locking piece 42 of 6 is pressed to rotate the pinch roller lever 36 counterclockwise to the pressing position. Therefore, while the pinch roller 38 contacts the capstan 12,
The torsion coil spring 44 provides pinch pressure.

Next, the operation of the power supply operation plate 78 will be described.

FIG. 3 shows a state in which the tape recorder is in the stop mode state and the power source operation plate 78 is in the power source ON position. In this state, the operation plate 78
The engaging pin 84 is engaged with the engaging recess 74a of the holding lever 74 and is held at the position shown in the figure. Further, in the stop mode, the right end portion of the engagement lever 68 is out of the movement path of the lock arm 85 of the operation plate 78, so that the operation plate is in a movable state.
On the contrary, as shown in FIGS. 4 and 6, when the tape recorder is set to the reproduction mode or the recording mode, the right end portion of the engagement lever 68 is located on the moving path of the lock arm 85. Therefore, in this case, since the lock arm 85 contacts the right end portion of the engagement lever 68, the movement of the operation plate 78 is blocked by the engagement lever 68. Also, as described above, in the stop mode,
The torsion coil spring 44 is released from the urging force and is in an unloaded state, and the pinch roller lever 36 is not receiving the urging force.

As shown in FIG. 7, when the power source operation plate 78 is moved to the left, the engagement pin 84 causes the holding lever 74 to rotate clockwise against the biasing force of the torsion coil spring 75. Then, when the operation plate 78 is further moved to the left, the engagement recess 74b of the holding lever 74 engages with the engagement pin 84, and the operation plate is held at the power OFF position shown in the figure. As a result, the power supply (not shown) of the tape recorder is turned off. Further, with the movement of the operation plate 78, the pressing cam 72 is pressed by the kick pin 83 to rotate counterclockwise around the support shaft 17. As a result, the pressing cam 72 causes the pressing pin 31 of the head lever 28 to move.
Is pressed to rotate the head lever about the support shaft 15 in the clockwise direction to the retracted position shown in the drawing, and the magnetic head 26 is further retracted. Further, the bent piece 39 of the pinch roller lever 36 is pressed by the left end portion of the head lever 28,
The pinch roller lever is rotated clockwise around the support shaft 15 to the non-pressed position shown in the figure. As a result, the pinch roller 38 is further retracted from the capstan 12. Further, as the pinch roller lever 36 rotates, the engagement lever 68 is pressed by the one end portion 45 of the torsion coil spring 44 and rotates counterclockwise around the support shaft 16 to guide the guide roller 7
0 moves to the vicinity of the bottom of the recess 61 of the operation switch 48. As a result, the operation switch 48 turns the guide roller 7
It is locked in the immovable state by 0. In this state, the end portions 45, 46 of the torsion coil spring 44 are
Has not been deformed, and the pinch roller lever 36 has not been biased.

In this way, when the power source operation plate 78 is moved to the OFF position, the power source of the tape recorder is turned off, and the magnetic head 26 and the pinch roller 38 are retracted from the magnetic tape and the capstan 12 and the tape cassette (not shown). Is ready to be ejected.

Shoulder portions 78a, 7 of the power operation plate 78 from the OFF position
When the operation plate 78 is moved to the cassette eject position where 8b contacts the guide pin 81, the tape cassette (not shown) is ejected. Operation plate 7
During the movement of 8, the kick pin 83 slides along the side surface of the pressing cam 72, and the pressing cam is held in a state of pressing the pressing pin 31 of the head lever 28. Therefore, the magnetic head 26 and the pinch roller 38 are also held in a state retracted from the magnetic tape.

According to the operation mechanism configured as described above, the following operational effects can be achieved.

As described above, the engagement lever 68 causes the operation switch 48 to operate.
When is moved to the reproduction mode setting position or the recording mode setting position, it is rotated by the operation switch to press the end portion 45 of the torsion coil spring 44, and the torsion coil spring 44 presses the pinch roller lever 36 toward the capstan 12 direction. Generate a biasing force. Further, when the operation switch 48 is moved to the stop mode setting position, the engagement lever 68 rotates in a direction away from the end portion 45 of the torsion coil spring 44 to release the biasing force of the torsion coil spring 44. Put in a load state. Therefore, the power supply operating plate 78 operated in the stop mode of the tape recorder does not receive the biasing force of the torsion coil spring 44, but only the relatively weak biasing force of the torsion coil spring 34 for biasing the head lever 28. Moved in the received state. Similarly,
Even in the power OFF position shown in FIG. 7, the torsion coil spring 44 is in an unloaded state, and the power operation plate is not subjected to the biasing force of the torsion coil spring 44 during the movement from the OFF position to the eject position. . Therefore,
The power source operation plate 78 can be lightly operated, and the power source of the tape recorder can be switched and the tape cassette can be ejected smoothly.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the holding means for holding the operation switch at each mode setting position is not limited to the combination of the engagement groove, the roller and the leaf spring, but a plurality of holes are formed in the operation switch, and the leaf spring urges these holes. The formed balls may be engaged.

(Effect of the Invention) As described in detail above, according to the operating mechanism of the present invention, when the operating member moves to the stop mode setting position, the biasing force of the biasing member that biases the pinch roller lever is released. It has a combination member. Therefore, the power operating member operated in the stop mode of the tape recorder can be lightly operated without receiving the biasing force of the biasing member. Therefore, according to the operating mechanism of the present invention, it is possible to smoothly switch the power source of the tape recorder and eject the tape cassette.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of a tape recorder equipped with an operating mechanism according to an embodiment of the present invention, and FIG. 2 is a plan view of the tape recorder in a stop mode.
FIG. 3 is a plan view of the tape recorder when the power operation plate is in the ON position, FIG. 4 is a plan view of the tape recorder in the reproduction mode, and FIG. 5 is the tape in the REV mode. FIG. 6 is a plan view of the recorder, FIG. 6 is a plan view of the tape recorder in the recording mode, and FIG. 7 is the power operation plate OFF.
It is a top view of the above-mentioned tape recorder in the state where it was located in a position. 10 ... Base, 12 ... Capstan, 26 ... Magnetic head, 28 ... Head lever, 36 ... Pinch roller lever, 38 ... Pinch roller, 44 ... Torsion coil spring, 45, 46 ... End part , 48 ... Operation switch, 68
...... Engagement lever, 70 …… Guide roller, 78 …… Power supply operation plate.

Claims (1)

[Claims] 1. A mode setting operation member having a stop mode setting position and a reproduction mode setting position, which is slidably provided between these mode setting positions, and a magnetic head supporting a magnetic head. A head lever movably provided between a contact position where the head can contact the magnetic tape and a retracted position where the head separates from the magnetic tape, and a pressing position that supports the pinch roller and can press the capstan. Between the pinch roller lever and the non-pressing position that is separated from the capstan and the operating member is in the stop mode setting position, turn on the power of the tape recorder and move the head lever to the retracted position. From the contact position to the contact position, and at the same time, move the pinch roller lever to the intermediate position between the pressed position and the non-pressed position to stop it. A power ON position to set the mode, a power OFF position to turn off the power of the tape recorder to move the head lever to the retracted position and move the pinch roller to the non-pressing position, and a cassette eject position to allow the ejection of the tape cassette. And a biasing member that is provided at a predetermined position and that biases the pinch roller lever toward the capstan when the reproduction mode is set, and the biasing member and the operating member. When the operating member slides from the stop mode setting position to the playback mode setting position,
The biasing member is pressed to generate a biasing force that pushes the pinch roller lever in the capstan direction to the biasing member, and at the position where the movement of the power source operating member is blocked when the operating member moves to the reproduction mode setting position. An engaging member that is moved to a position that releases the urging force of the urging member and allows the movement of the power supply operating member when the operating member moves to the stop mode setting position. The operating mechanism of the tape recorder.