JPS5822267Y2 - Control mechanism of tape recorder - Google Patents

Description

[Detailed description of the invention] The present invention relates to a control mechanism for a tape recorder, and in particular provides a mechanism that can automatically switch the operation of the tape recorder or stop it when the magnetic tape reaches its end. This is what I am trying to do.

The present invention will be described in detail below with reference to the illustrated embodiments.

1 and 2 are bottom views showing different states, and FIG. 3 is a side view.

In the figure, 1 is a flywheel to which the rotation of an electric motor (not shown) is transmitted by a belt, 2 is a drive gear that rotates together with the flywheel 1, and 3 is a drive gear that is rotatably mounted around a shaft 4 and has a spring. The first switching lever is biased clockwise by reference numeral 5, and is rotated counterclockwise by a tape end detection mechanism.

A second shaft 6 is rotatably mounted around a shaft 7 and biased counterclockwise by a spring 8.
This is a switching lever, and is configured to rotate clockwise as the first switching lever 3 rotates counterclockwise.

Reference numeral 9 denotes a rotary lever that is rotatably attached to the shaft 10 and urged counterclockwise by a spring 11. In the non-switching operating state, the second switching lever 6 is rotated as shown in FIG. Its rotational displacement is regulated by contact with the first control section 12.

13 is a first transmission gear which is rotatably attached to the rotary lever 9 and meshes with the driving gear 2 by the rotational displacement of the rotary lever 9 during a switching operation; 14 together with the first transmission gear 13; This is a rotating second transmission gear.

Reference numeral 15 denotes a main gear which is rotatably attached to the shaft 10 and to which the rotation of the second transmission gear 14 is transmitted. A toothless portion 15a is formed to facilitate this.

Reference numerals 16 and 17 denote first and second cams that are provided to rotate integrally with the main gear 15. As shown in the figure, the first cam 16 has an eccentric shape, and the second cam 17 has the first and second cams that rotate together with the main gear 15. 2 recess 19 into which the second control section 18 of the switching lever 6 is fitted.
is formed.

Reference numeral 20 denotes a control member that is mounted so as to be movable in a straight line by engaging the shafts 10 and 21 with the engagement holes 22 and 23, and is urged in the direction of arrow A by a spring 24.

A roller 25 is rotatably attached to the control member 20 by a shaft 26, and comes into contact with the cam surface 16a of the first cam 16 as the first cam 16 rotates, and also receives a pressing force due to the eccentricity of the first cam 16. This has the effect of displacing the control member 20 in the direction of arrow B against the biasing force of the spring 24.

Reference numeral 27 denotes a locking member that is swingable in the vertical direction and around the shaft 21, and forms a locking mechanism by cooperating with a locking pin 28 attached to the speech control member 20.

Such a locking mechanism is a so-called button-button mechanism, and when the control member 20 is initially displaced in the direction of arrow B, the lock pin 28 is moved to the engaging portion 29, thereby causing the control member 20 to be displaced. Lock in position and press arrow B again
The lock is released upon displacement in that direction.

Since such a locking mechanism is well known, its details will be omitted.

Reference numeral 30 denotes a switching member that slides and displaces in accordance with the displacement of the control member 20 to switch the operation of the tape recorder.

In such a configuration, the shape of the main gear 15, the first cam 16, and the positional relationship of the recess 19 of the second cam 17 are such that when the roller 25 passes through the maximum diameter portion 16b of the first cam 16, which has an eccentric shape, a toothless portion occurs. 15a is in a position where it meshes with the second transmission gear 14, and the second control part 18 of the second switching lever 6 is in a position where it comes into contact with the inclined part 19a of the recess 19 of the second cam 17.

Reference numerals 31, 32, 33 and 34 are operation levers for fast forwarding, playback, rewinding and stopping, respectively, and are urged toward arrow B sushi by husband return springs 35, 36, 37 and 38.

Reference numeral 39 denotes the fast-forward operating lever 31, the reproducing operating lever 32, the rewinding operating lever 33, and the stopping operating lever 3.
a locking piece 39a that is displaced in the direction of arrow C by the operating pieces 31a, 32a, 33a, and 34a of No. 4 and locks the fast-forwarding operating lever 31, the reproducing operating lever 32, and the rewinding operating lever 33 in their operating positions; 3
9b and 39c are formed on the lock plate, and is biased in the direction of the arrow by a spring 40.

Reference numeral 41 denotes a release lever which is rotatably attached to the lock plate 39 with a pin 42 and biased counterclockwise by a spring 43, and when in the operating position shown in FIG. The rotational displacement position of the switching lever 3 in the counterclockwise direction is related to the end portion 3a of the first switching lever 3 so as to be suppressed and displaced in the direction of arrow C.

44 is the arrow A due to engagement with the pin 45° 46 and the elongated holes 4γ and 48.

This is a selection lever mounted so as to be displaceable in the direction B, and includes a first restriction pin 49 that comes into contact with the rotational lever 9 and restricts the rotational displacement operation of the rotational lever 9, and the release lever 4.
A second regulating pin 50 is provided which contacts the release lever 1 and regulates the rotational displacement position of the release lever 41.

The selection lever 44 is configured to be held in two positions, the position shown in FIG. 1 and the position shown in FIG. 2, and the position shown in FIG. 1 is an automatic stop operation state; The position shown in FIG. 2 is the operation switching state of the tape recorder.

The present invention is configured as described above, and next, the switching member 30
The operation when this switch is used as a mechanism for switching from playback to review state will be explained.

First, the operation when the selection lever 44 is in the position shown in FIG. 1, that is, in the automatic stop operation state, will be described.

FIG. 1 shows a playback state in which the playback operation lever 36 is locked in the operating position by the lock piece 39b of the lock plate 39. When the playback operation is performed and the magnetic tape reaches the end, the end detection mechanism switches the playback operation lever 36 to the first switching position. The lever 3 is rotated counterclockwise.

When the first switching lever 3 is rotated counterclockwise, its end portion 3a abuts against the abutting portion 41a of the release lever 41, pushing the release lever 41 in the direction of arrow C.

Since the release lever 41 is attached to the lock plate 39, as the first switching lever 3 is rotated counterclockwise, the lock plate 39 is displaced in the direction of arrow C and is locked. , regeneration operation lever 3 with lock piece 39b
2 is released, and the tape recorder returns from the playback state to the stop state.

Further, as the first switching lever 3 is rotated counterclockwise, the second switching lever 6 is rotated clockwise, and the regulating action of the first control section 12 on the rotating lever 9 is cut off. Since the rotational displacement of the rotary lever 9 is restricted by the first restriction pin 49 of the selection lever 44, the first transmission gear 13 meshes with the drive gear 2 and the switching mechanism operates, thereby preventing the tape recorder from switching its operation by mistake. It will never be done.

The automatic stopping operation in the fast-forwarding operation state and the rewinding operation state is also performed by the above-described operation.

Next, the operation when the selection lever 44 is in the position shown in FIG. 2, that is, the position for switching the operation of the tape recorder, will be described.

In this case, the release lever 41 is rotationally displaced by the biasing force of the spring 43 to a position where it is regulated by the selection lever 44 (7) and the second restriction pin 50, and in this state, the first switching lever 3 comes into contact with the release lever 41. There is no automatic stop operation.

The regeneration operation lever 32 is connected to the lock piece 39b of the lock plate 39.
When the magnetic tape reaches the end in the reproducing operation state where it is locked in the operating position, the first switching lever 3 is rotated counterclockwise by the tape end detection mechanism.

When the first switching lever 3 is rotated counterclockwise, the second switching lever 6 is rotated clockwise in accordance with the rotational displacement.

When the second switching lever 6 is rotated clockwise, the second switching lever 6 is rotated clockwise.
The regulating force exerted on the rotary lever 9 by the first control section 12 of the switching lever 6 is cut off, and the second control section 18 controls the second cam 17.
It separates from the recess 19 of.

Since the selection lever 44 has moved to the switching operation side, the rotary lever 9 does not receive the regulating force from the first regulating bin 49, and as a result, the rotary lever 9 is moved by the spring 11.
is rotated counterclockwise by the urging force of the first
The transmission gear 13 meshes with the drive gear 2.

At this time, the rotational displacement of the rotational lever 9 is restricted by a stopper (not shown), and the engagement between the first transmission gear 13 and the drive gear 2 is maintained in an optimal state.

Therefore, the rotation of the drive gear 2 in the direction of arrow E is transmitted to the first transmission gear 13, and the rotation is further transmitted to the main gear 15 via the second transmission gear 14, causing the main gear 15 to rotate in the direction of arrow F. .

After the main gear 15 starts rotating, the second control section 18 of the second switching lever 6 comes into contact with the peripheral edge 17a of the second cam 17, so the first switching lever 3 returns to its original non-operating position. However, the second switching lever 6 is in the operating position, and the rotating lever 9 is held in a position where the drive gear 2 and the first transmission gear 13 mesh with each other.

In this state, the main gear 15 rotates in the direction of arrow F, and along with this rotation, the first cam 16 and the second cam 17 also rotate.

As the first cam 16 is eccentric as shown, the roller 25 moves against the cam surface 16 of the first cam 16 as it rotates.
The roller 25 is subjected to a pressing force in the direction of arrow B while making contact with point a.

Since the roller 25 is attached to the control member 20, the pressing force from the first cam 16 causes the control member 20 to slide in the direction of arrow B.

When the control member 20 is slid in the direction of arrow B, the lock pin 28 swings the lock member 27 and then the engagement portion 2
9 and prevents the control member 20 from returning in the direction of arrow A as the roller 26 passes the maximum diameter portion 16b of the first cam 16 at the operating position.

That is, the control member 20 is locked in the operating position displaced in the direction of arrow B by the locking mechanism.

When the roller 25 passes through the maximum diameter portion 16b of the first cam 16, the toothless portion 15a of the main gear 15 is in a position to mesh with the second transmission gear 14, and the second control portion 18 of the second switching lever 6 is the inclined portion 19a of the recess 19 of the second cam 17.
It is located in a position where it comes into contact with the

When the second control part 18 of the second switching lever 6 comes into contact with the inclined part 19a of the recess 19, the toothless part 15a of the main gear 15
The second transmission gear 1 is in a position where it meshes with the transmission gear 14.
4, that is, the load applied to the first transmission gear 13 is reduced, and the engagement between the drive gear 2 and the first transmission gear 13 can be easily released.

This disengagement is performed by fitting the second switching lever 6 into a recess 19 formed in the second cam 17 of the second control section 18.

That is, the second control portion 18 is inserted into the recess 19 .

That is, when the second control part 18 is fitted into the recess 19, the second switching lever 6 is rotated counterclockwise, and as a result, the first control part 12 of the second switching lever 6 comes into contact with the rotating lever 9, and the corresponding The rotation lever 9 is rotated clockwise to disengage the first transmission gear 13 from the drive gear 2.

At the end of this meshing operation, the main gear 15 is slightly rotated in the direction of arrow F due to the pressing force on the inclined part 19a of the recess 19 of the second control part 18, so that the main gear 15 and the second transmission gear 14 are meshed. become a state.

When such an operation is performed, the control member 20 and the switching member 30
is displaced and locked in the operating position, and the tape recorder is switched from the playback operating state to the review operating state by the switching action of the switching member 30.

When the tape is rewound and reaches the starting end, the first switching lever 3 is rotated counterclockwise again by the detection mechanism.

As a result of each of the above-described operations being performed and the control member 20 being displaced in the direction of arrow B, the lock mechanism releases the lock of the control member 20 by a well-known operation, and the control member 20 is moved by the biasing force of the spring 24. The sliding mold is returned to the direction of arrow A, which is the non-operating position.

Therefore, the switching member 30 also returns to the non-operating position and the rewinding operation of the tape recorder is canceled.

In this case, since the rewinding operation is performed without releasing the lock of the playback operation lever 32 by the lock plate 39, that is, the review operation is performed, the tape recorder is activated when the rewinding operation is released. The system enters a playback mode and starts playing from the beginning of the tape.

Therefore, after that, the playback operation and the rewinding operation are repeated alternately, and such a mechanism is suitable for a tape recorder for language practice which requires repeating and playback functions.

In this embodiment, the first transmission gear 13 and the second transmission gear 14 are used as gears that transmit the rotation of the drive gear 2 to the main gear 15.
Although the case where two gears are used has been described, it is of course possible to use more gears, and it is also possible to use one gear.

Further, in this embodiment, the case where switching by the switching member 30 is used to switch between playback and rewinding has been described, but it can also be used to switch the playback direction of a tape recorder having a bidirectional playback function.

As explained above, the control mechanism of the present invention selectively performs an automatic stop operation that automatically returns the tape recorder to a stopped state when a tape ends, and a switching operation that switches to another operating state. Therefore, the practical value of the present invention is extremely high.

[Brief explanation of the drawing]

The drawings relate to the present invention; FIGS. 1 and 2 are bottom views showing different states, and FIG. 3 is a side view. Explanation of main drawing numbers, 1... Flywheel, 2... Driving gear, 3... First switching lever, 6... Second switching lever, 9... Rotating lever 12... first control unit, 13
...First transmission gear, 14...Second transmission gear, 15.
...Main gear, 16...First cam, 17...Second cam, 18...Second control section, 19...Recess, 20...
Control member, 25... o --y-127... Lock member, 28... Lock pin, 30... Switching member, 3
9...Lock plate, 41...Release lever, 44...
Selection lever 49...first regulation pin, 50...second regulation pin.

Claims (1)

[Scope of utility model registration request] A drive gear that rotates together with the flywheel, a switching lever that is displaced by a magnetic tape end detection mechanism, and a transmission gear that meshes with the drive gear when the switching lever is displaced and transmits the rotation of the drive gear to the main gear. A cam mechanism that rotates together with the main gear, a control member that moves linearly by the cam mechanism, and a lock mechanism that locks the erroneous control member in an operating position when the control member first moves and releases the lock when it moves again. a switching member that is displaced in accordance with the linear motion of the control member to switch the operation of the tape recorder; a lock plate that locks the operating lever of the tape recorder; and a switching member that is displaced when the switching lever is displaced and is operated by the lock plate. It consists of a release lever that releases the lock of the lever, and a selection lever that selects the operation/non-operation of the release lever and the meshing operation of the driving gear and the transmission gear, and the selection lever is operated to select when the magnetic tape ends. A control mechanism for a tape recorder, characterized in that it is configured to selectively switch the operation of the tape recorder and automatically stop the tape recorder.