JPH0765439A - Tape running stoppage detecting device - Google Patents

Abstract

PURPOSE:To provide a tape running stoppage detecting device capable of giving the degree of freedom to the arrangement of members for releasing the pressing of a spring by preparing two parts for releasing the pressing of the spring for a malfunction preventing device. CONSTITUTION:When the tape running operation lever of a tape recorder is in a non-actuation position, a spring 41 presses a rocking member Y so that the tip part 34 of the rocking member Y is not abutted on the actuating projection 82 of a rotating body 80 and the malfunction of the detection of the tape running stoppage is prevented. The one end 43 and the other end 44 of this spring 41 are engaged with the rocking member Y and with an other end- releasing member 56 respectively to be in a pressing state. Further, a releasing device for releasing the pressing state of the spring 41 is constituted of an one end-releasing member 51 for releasing the one end of the spring 41 and the other end-releasing member 56 for releasing the other end 44 of the spring 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects that the tape running of a tape recorder has stopped and releases the tape running operating lever such as the tape playing operating lever or the tape fast-forwarding operating lever from the operating position. To a non-operating position or switching the tape running direction (so-called auto-reverse), a tape running stop detection device,
In particular, the present invention relates to a tape running stop detection device having a mechanism for preventing a malfunction of the detection.

[0002]

2. Description of the Related Art As a tape traveling stop detection device of a tape recorder, a structure shown in FIG. 4 is conventionally known. FIG. 4 is a diagram for explaining a conventional example of a tape traveling stop detection device of a tape recorder, and is a plan view in a state where the tape recorder is stopped.

In the following description, "front side" means the arrow X1 direction in the figure, and "rear side" or "back side" means the arrow X2 direction in the figure. "Left" means arrow Y1 in the figure.
It means a direction, and “right” means an arrow Y2 direction in the drawing. Furthermore, "upper" means the Z1 direction in the figure, and "lower" means the Z2 direction in the figure. Furthermore, in the figure, "." In "○" means an arrow pointing from the back side of the paper to the front side.
What has "X" written inside means an arrow from the front to the back of the paper.

In FIG. 4, when the tape of the tape recorder is run, the tape running operation levers such as the tape playback operation lever 01 and the tape fast forward operation lever 02 are operated. , Are pushed into the back side (X2 direction). Then, when the tape reproducing operation lever 01 is pushed in, the projection 01a formed on the lower surface thereof is engaged with the engaging portion 03a of the engaging plate 03, and the pushed state is maintained. Further, the projection 01b formed on the upper surface of the tape reproduction operation lever 01 presses the cam portion 05 of the motor drive operating plate 04, and moves the motor drive operating plate 04 leftward (Y1 direction). By moving the motor drive operating plate 04 to the left, the operating projection 04b formed at the left end of the motor drive operating plate 04 turns on the switch 09. When the switch 09 is turned on, a tape running motor (not shown) is driven.

While the tape running motor is being driven, the eccentric cam 010 in the center of the right side is constantly rotating clockwise, and the cam surface 011 of the eccentric cam 010 is constantly rotating.
Rotates about a rotation axis 012. The cam surface 011 has a portion S having a short distance from the rotating shaft 012 and a portion L having a long distance.

The right front side of the swing member 020 (Y2.
The front end portion 021 (on the X1 side) is arranged so as to be able to contact the cam surface 011. Further, since the eccentric cam 010 is rotating as described above, the tip portion 021 may come into contact with the short portion S or the long portion L, and the rocking member 020 rotates the rocking shaft 022 about the axis. Can be swung as.

When the tape reproducing motor is driven by pushing the tape reproducing operation lever 01, the tape is not stopped except when it comes to the end of the tape and is stopped.
Generally running. While the tape is running,
The reel shaft 030 is rotating, and the projection 031a or 031b of the pressing member 031 slidably fitted to the reel shaft 030 is in contact with and pressed against the swinging member 020 by the rotational force of the reel shaft 030. . Then, due to the pressing, the swing member 020 rotates clockwise around the swing shaft 022.

Therefore, the tip portion 02 of the swing member 020
1 contacts and slides on the surface of the cam surface 011. Since the cam surface 011 has the portion S and the portion L having a short distance from the rotating shaft 012 as described above, the tip portion 021 moves closer to or away from the rotating shaft 012, and the swing member 02.
0 swings around the swing shaft 022.

(When tape running stops) When the tape reaches the end and the running is stopped, the reel shaft 0
30 also stops. Then, the pressing member 031 cannot obtain the rotational force from the reel shaft 030 and does not press the swinging member 020. Further, the spring 041 serves as a spring biasing portion 0 when the motor driving operating plate 04 moves leftward.
Due to the displacement of 4a to the left, no force is applied to the swing member 020.

At this time, the tip portion 021 of the swing member 020
However, when the eccentric cam 010 rotates when the cam surface 011 is in contact with the long portion L, the portion of the cam surface 011 with which the tip portion 021 abuts is from the long portion L to the short portion S.
Move to. Therefore, as the eccentric cam 010 rotates, the tip end portion 021 abuts and slides on the cam surface 011 while
When the cam surface 011 is pressed, the cam surface 011 sequentially moves toward the rotary shaft 012. Then, the short portion S of the cam surface 011 reaches the tip portion 021 of the swing member 020. This allows
The tip portion 021 gradually approaches the rotating shaft 012.

Further, when the eccentric cam 010 rotates, the position of the cam surface 011 where the tip portion 021 exists moves from the short portion S to the long portion L, but this time, the cam surface 011 moves away from the tip portion 021. Do not press because it moves. Therefore, the tip portion 021 does not move and maintains the position approaching the rotation axis 012. Therefore, the tip portion 021 moves away from the surface of the cam surface 011. And
The actuating protrusion 013 formed on the eccentric cam 010 rotates in the clockwise direction together with the eccentric cam 010, and the tip portion 021
Abut.

The actuating protrusion 013 further rotates in the clockwise direction even if it comes into contact with the tip portion 021. However, the tip portion 021 is supported by the swing shaft 022 fixed to the chassis and cannot move. As a result, the actuating protrusion 013 receives a force by a reaction, and the rotating shaft 012 of the eccentric cam 010 on which the actuating protrusion 013 is formed receives a rightward force. By the way, the rotating shaft 012 is fixed to the support plate 015, and the support plate 015 is
It is rotatably supported about the capstan shaft 016. Therefore, when the rotating shaft 012 receives a force in the right direction as described above, the rotating shaft 012 moves in the right direction and rotates the support plate 015 in the clockwise direction.

By the clockwise rotation of the support plate 015, the front end (end on the X1 side) 017 of the support plate 015 moves to the left side, and the locking plate 03 moves to the left side (Y1 side). By moving the locking plate 03 to the left, the protrusion 01a is released from the engagement by the locking portion 03a. As a result, the tape reproducing operation lever 01 returns to the front side by the urging force of the spring (not shown). By this movement, the motor drive operating plate 0
4 also returns to the original position, the switch 09 is turned off, and the tape running motor (not shown) is stopped.

(Prevention of Malfunction of Tape Travel Stop Detection Device) The pressing member 031, the swing member 020, the eccentric cam 010, and the support plate 015 constitute a tape travel stop detection device. A spring 041 is provided so that the stop detection device does not malfunction.

With the tape running in FIG. 4 stopped,
The tip portion 021 of the swinging member 020 may be in contact with the actuating protrusion 013 of the eccentric cam 010. In such a case, when the tape running operation lever is pushed in, the tape running motor (not shown) is driven in the same manner as described above,
The eccentric cam 010 immediately rotates.

Further, the reel shaft 030 rotates, and the projection 031a of the pressing member 031 is rotated by the rotation of the reel shaft 030.
Press 20. Then, the swinging member 020 rotates in the clockwise direction to release the contact between the tip portion 021 and the actuating protrusion 013.

However, before the contact between the tip end portion 021 and the actuation protrusion 013 is released, the actuation protrusion 013 may press the tip end portion 021 due to the rotation of the eccentric cam 010. In this case, the pressing of the actuating protrusion 013 causes the support plate 015 to rotate in the clockwise direction, and the tape running stop detection device is actuated. Therefore, although the tape running operation lever is pushed, it is locked to the locking plate 03, but the locking by the locking plate 03 is immediately released, and the tape returns to its original non-operating position.

A spring 041 is provided to prevent such a malfunction of the tape running stop detection device.
The spring 041 is rotatably supported by a support shaft 025 formed on a support member (not shown) that supports the swinging member 020, and one end thereof is a locking portion 026 formed on the lower surface of the swinging member 020. The other end is engaged with the spring biasing portion 04a of the motor drive operating plate 04.

Then, when the tape running operation lever shown in FIG. 4 is not pushed in, the spring 041
One end urges the locking portion 026 of the swinging member 020 to the back side (X2 direction). Due to this biasing force, the rocking member 020 rotates clockwise around the rocking shaft 022, and the tip portion 02 thereof is rotated.
1 moves to the front side (X1 direction), and the contact between the tip portion 021 and the operation protrusion 013 is released. As described above, when the tape running operation lever is not pushed in, the contact between the tip end portion 021 and the actuating protrusion 013 is always released.
In this way, malfunction of the tape running stop detection device is prevented.

When the tape running operation lever is pushed, the spring biasing portion 04a is displaced leftward (Y1 direction) together with the motor drive operating plate 04, and the biasing force of the spring 041 is released. One end of 041 is the swing member 02.
The locking portion 026 of 0 is no longer biased. Therefore, when the tape running operation lever is pushed in, the tape running stop detection device operates as described above.

[0021]

The malfunction prevention device of the tape running stop detection device shown in FIG. 4 uses a motor drive operating plate. By the way, although the tape recorder shown in FIG. 4 has a one-way tape reproducing direction, another tape recorder has a so-called auto-reverse mode in which the tape reproducing direction is both directions and the running direction is automatically switched. There are types of formats. In the case of this type of tape recorder, since a tape running direction switching plate for switching running gears and the like is provided, the motor driving operation plate is arranged on the opposite surface of the chassis due to space limitations. Therefore, the motor drive operating plate cannot be used as a malfunction prevention device for the tape traveling stop detection device.

Further, since the tip end portion of the swing member and the actuating projection of the eccentric cam rarely come into contact with each other, it is conceivable to remove the malfunction preventing device. However, in a so-called double-deck mechanism in which two cassette tape recorders are integrally provided, one tape traveling motor may drive two tape recorders.

In this case, in one of the tape recorders, when the tape running operation lever is pushed to run the tape, the tape running motor rotates and the eccentric cam of the other tape recorder also rotates. However, in the other tape recorder, the tape running operation lever is not pushed in, and the gear mechanism for rotating the reel shaft does not operate. Therefore, since the reel shaft does not rotate, the tape traveling stop detection device operates to move the locking plate and the tape traveling direction switching plate. The operating noise generated at that time is annoying. Particularly, in the case of the tape traveling direction switching plate, since it reciprocates, the operating noise is continuously generated. Therefore, the malfunction prevention device cannot be omitted from the tape recorder.

The present invention has been made to solve the above problems. The spring for the malfunction preventing device is provided with two portions for releasing the bias, and a degree of freedom is given to the arrangement of the members for releasing. It is an object of the present invention to provide a tape traveling stop detection device that can be used.

[0025]

In order to achieve the above object, a tape traveling stop detection device for a tape recorder according to the present invention is configured such that a tape traveling motor of the tape recorder rotates during rotation and a cam surface (81). ) And actuating protrusion (8
2) a rotating body (80), a swing member (Y) whose tip (34) abuts on a cam surface (81) of the rotating body (80) while the tape is running, and this swing member. The spring (41) for urging the swinging member (Y) in the direction in which the tip portion (34) of (Y) contacts the cam surface (81), and the spring (4).
And a releasing device for releasing the urging force of 1).

When the tape traveling motor of the tape recorder is rotating, the tip end portion (34) of the swinging member (Y) contacts the cam surface (81) of the rotating body (80) while the tape is traveling. Therefore, when the tape running is stopped, the tip end portion (34) of the swinging member (Y) separates from the cam surface (81) of the rotating body (80), and the operating protrusion (82) of the rotating body (80). The stop of the tape running is detected by touching the tape.

Further, in order to prevent malfunction of the detection of the tape running stop, the releasing device does not operate when the tape running operating lever is in the non-operating position, so the spring (4
1) biases the swinging member (Y). When the tape traveling operation lever such as the tape reproduction operation lever and the tape fast-forward operation lever (F) is in the operating position, the release device operates, so the spring (41) causes the swinging member (Y).
Do not energize.

The releasing device is provided with one end (4) of the spring (41).
3) for releasing one end releasing member (51) and spring (4)
The other end releasing member (56) for releasing the other end (44) of 1). When the spring (41) is biased, one end (43) of the spring (41) is attached to the swing member (Y) and the other end (4) is
4) is engaged with the other end releasing member (56). Operation lever for tape playback or operation lever for fast-forwarding tape (F)
When either one of them is in the operating position, the engagement between the other end releasing member (56) and the spring (41) is released.

When the other one of the tape reproducing operation lever and the tape fast-forwarding operation lever (F) is in the operating position, the one end releasing member (51) displaces one end (43) of the spring (41), Spring (41) and swing member (Y)
To disengage from.

Further, an operation protrusion (21b, 22b) for pressing the one end releasing member (51) for displacing one end (43) of the spring (41) is provided at the tip of the fast-forwarding tape operation lever (F). Preferably.

[0031]

[Operation] When the operation lever for tape running is in the non-actuated position, the tip of the swing member (Y) (34) is prevented from coming into contact with the actuating protrusion (82) of the rotating body (80). 41) urges the swinging member (Y) to prevent erroneous detection of tape running stop.

Further, when the tape traveling operation lever such as the tape reproduction operation lever or the tape fast-forward operation lever (F) is in the operating position, the release device for releasing the bias of the spring (41) is operated. Since the spring (41) does not bias the swing member (Y), the tape running stop detection device is operating.

One end (43) of the spring (41) is a swinging member (Y), and the other end (44) is the other end releasing member (5).
6) is in an urging state by engaging with 6), and the releasing device for releasing the urging state of the spring (41) is composed of one end releasing member (51) and the other end releasing member (56). There is.

When either the tape reproducing operation lever or the tape fast-forwarding operation lever (F) is moved to the operating position, the engagement of the spring (41) by the other end releasing member (56) is released. Further, when either the tape reproducing operation lever or the tape fast-forwarding operation lever (F) moves to the operating position, the one end releasing member (51) causes the spring (41) to move.
One end (43) of the is displaced to release the engagement by the swinging member (Y).

Further, an operation protrusion (21b, 22b) for pressing the one end releasing member (51) for displacing one end (43) of the spring (41) is provided at the tip of the fast-forwarding tape operation lever (F). In this case, when the tape fast-forwarding operation lever (F) is set to the operating position, the operation protrusions (21b, 22b) provided at the tip of the tape fast-forwarding operation lever (F) cause the one-end releasing member (51). Is pressed, the one end releasing member (51) displaces one end (43) of the spring (41) to release the engagement by the swinging member (Y).

[0036]

[Examples] Next, an example of a tape traveling stop detection device for a tape recorder according to the present invention will be described. FIG. 1 is a view for explaining an embodiment of a tape traveling stop detection device of a tape recorder of the present invention, and is a plan view showing a structural relationship with a tape fast-forwarding operation lever. FIG. 2 is a view for explaining the same embodiment and is a plan view showing the structural relationship with the head mounting plate. FIG. 3 is a view for explaining the progress of the operation of the tape traveling stop detection device shown in FIG. 2, and is a plan view thereof.

(Regarding the vertical relationship of members) In FIGS. 1 to 3, since the drawings are too complicated, a locking plate for locking the tape running operation lever and the like are omitted from the drawings. A pair of tape fast-forwarding operation levers F shown in FIG. 1 are located closest to a chassis (not shown), a tape running direction switching plate K is provided above the lever, and a swing member shown by a chain double-dashed line is provided above the tape traveling direction switching plate K. Y is arranged. In FIG. 2, a head mounting plate H is arranged above the swinging member Y. In FIG. 1, the upper head mounting plate H and the lever 56 are omitted, and in FIG. 2, the lower tape fast-forwarding operation lever F and the lever 51 are omitted.

(Regarding tape running direction switching plate K)
In FIG. 1, the right side of the tape running direction switching plate K (Y
On the second side), a manual engagement recess 1 is formed. Further, a right side automatic engaging concave portion 2 is formed on the front right side of the tape running direction switching plate K, and a left side automatic engaging concave portion 3 having the same shape as the right side automatic engaging concave portion 2 is formed on the left side. Further, a pair of restricting portions 4 and 5 are formed on the rear side so as to project rearward (X2 direction).

The tip of an L-shaped manual switching lever 11 is engaged with the manual engagement recess 1. The manual switching lever 11 is rotatably supported around a shaft 12. On the obtuse angle side of the L-shape of the manual switching lever 11, a substantially U-shaped plastic spring 13 is integrally resin-molded. A pair of engaging portions 14 is formed on the plastic spring 13 and engages with a shaft 16 fixed to the chassis. As a result, the manual switching lever 11 is held in a stable state.

(Regarding operation lever F for fast-forwarding tape)
In FIG. 1, the right tape fast-forwarding operation lever F is
A fast forward (FF) operation lever 21 that winds a tape around a reel on the right side of a tape cassette. FF
An engaging projection 21a that can be engaged with a locking plate (not shown) is provided on the lower surface of the operating lever 21, and an operating protrusion 21b is formed on the rear side (X2 side). The FF operation lever 21 is biased to the front side (X1 side) by a spring (not shown).

The left-side tape fast-forwarding operation lever F is a rewinding (REW) operation lever 22 for winding the tape around the left reel of the tape cassette. Similar to the FF operation lever 21, the REW operation lever 22 is provided with an engagement protrusion 22a that can be engaged with the engagement plate on the lower surface, and an operation protrusion 22b on the rear side (X2 side). Has been formed. Further, like the FF operation lever 21, it is biased to the front side (X1 side) by a spring.

(Rotating member Y) The rocking member Y is supported so as to be rockable around a rocking shaft 31. A left pressed surface 32 and a right pressed surface 33 are formed on the right rear side. Further, a front end portion 34 is provided on the right front side by bending downward. Immediately to the left of the swing shaft 31, a locking portion 36 that locks one end of the spring 41 is formed so as to project from the lower surface of the swing member Y.

(Regarding Spring 41) In FIG. 1, the spring 41 is rotatably supported by a shaft 42 provided on a member (not shown) that supports the swinging member Y. One end 43 of the spring 41 is engaged with the locking portion 36. The lever 51 for releasing this engagement is rotatably supported by a shaft 52 provided on a member (not shown) that supports the swinging member Y. An engaging portion 53 is formed so as to project upward at the right end of the lever 51, and is arranged so as to be able to contact the one end 43 of the spring 41. A pressed portion 54 is formed at the left end of the lever 51.

In FIG. 2, the other end 44 of the spring 41 is locked to the engaging portion 57 of the lever 56. The lever 56 is rotatably supported by a shaft 58 provided on a member (not shown) that supports the head mounting plate H. A pin 59 is formed at the front end (X1 side) of the lever 56 so as to project upward. The lever 51 as the one end releasing member shown in FIG. 1 and the lever 5 as the other end releasing member shown in FIG.
6 constitutes a releasing device for releasing the biasing force of the spring 41 with respect to the swinging member Y.

(Head mounting plate H) In FIG. 2, the head mounting plate H has a pin 59 of the lever 56 on the head mounting plate H.
A pair of engaging holes 61 for engaging with each other are formed. The engagement hole 61 is composed of a restriction hole 61a elongated in the front-rear direction and a large opening hole 61b formed on the front side thereof. A head 63 is mounted on the upper surface of the head mounting plate H. The head mounting plate H is biased to the front side (X1 side) by a spring (not shown).

(Reel Shaft 70, Eccentric Cam 80, Support Plate 90, etc.) Reel Shaft 70, Eccentric Cam 80,
The support plate 90 corresponds to the reel shaft 030, the eccentric cam 010, and the support plate 015 of the conventional tape running stop detection device shown in FIG. 4, and since they have the same structure, the details of the structure will be omitted.

In FIG. 1, the front end 91 of the support plate 90 is engaged with the right automatic engaging recess 2 of the tape running direction switching plate K. Also, in reality, the reel shaft 7
0, eccentric cam 80, support plate 90, spring 41, lever 56
And the rocking member Y is symmetrically arranged in a pair,
Only the right side member is shown in the figure. The lever 51 is provided only on the right side.

(Operation of the Embodiment) Next, the operation of the embodiment having the above-mentioned structure will be described. (Head mounting plate H and operation lever F for fast-forwarding tape)
2 is in the non-operating position), in FIG. 2, the tape reproduction operation lever (not shown) and the tape fast-forward operation lever F (see FIG. 1) attached to the head attachment plate H are not pushed in, that is, non-operated. When in the operating position, one end 43 of the spring 41 is engaged with the locking portion 36 of the rocking member Y.

The other end 44 of the spring 41 is connected to the lever 56.
Of the shaft 58.
Although the pin 59 formed on the other end of the lever 56 is engaged with the restriction hole 61a of the engagement hole 61 formed on the head mounting plate H, the rotation of the lever 56 is possible. Is regulated by the regulation hole 61a. Therefore, the one end 43 of the spring 41 is urged by the urging force of the one end 43 of the spring 41.
6 is pressed to the rear side (X2 direction). By this pressing, the rocking member Y rotates clockwise around the rocking shaft 31.

Due to this clockwise rotation, the tip end portion 34 formed by bending the swinging member Y downward is penetrated through the opening 92 of the support plate 90, and the eccentric cam 80 which is a rotating body.
Abuts on the cam surface 81.

Therefore, even when the front end 34 of the rocking member Y is in contact with the actuating projection 82 of the eccentric cam 80 at the end of the previous tape running, the head mounting plate H and the fast-forwarding tape operating lever F are provided. Is in the inoperative position,
By the clockwise rotation of the swinging member Y by the spring 41, the tip portion 34 is separated from the operating protrusion 82 of the eccentric cam 80.
As a result, as described in the conventional example, the malfunction of the tape traveling stop detection device can be prevented.

(When the tape fast-forward operation lever F is in the operating position) In FIG. 1, when the tape fast-forward operation lever F, for example, the FF operation lever 21 is pushed,
A tape traveling motor (not shown) is driven to rotate the flywheel gear 96. And flywheel gear 9
The eccentric cam gear 84 meshing with the 6 rotates, and the eccentric cam 80 formed integrally with the eccentric cam gear 84 also rotates.

When the tape running motor is driven and the gear mechanism (not shown) is actuated, the reel shaft 70 also rotates counterclockwise, and the projection 71a of the pressing member 71 slidably attached to the reel shaft 70. Presses the left pressed surface 32 of the rocking member Y, and the rocking member Y rotates clockwise. Therefore, the tip portion 34 of the swinging member Y has the eccentric cam 8
The cam surface 81 of 0 contacts and slides.

When the FF operation lever 21 is pushed in,
The operating protrusion 21b presses the pressed portion 54 of the lever 51 to move it to the rear side (X2 side). By this movement, the lever 51 rotates clockwise, and the engaging portion 53 thereof displaces the one end 43 of the spring 41 to the front side. By this displacement, the engagement between the one end 43 of the spring 41 and the locking portion 36 of the swing member Y is released.

When the tape reaches the end and the running of the tape is stopped, the rotation of the reel shaft 70 is stopped and the protrusion 71a of the pressing member 71 does not press the left pressed surface 32 of the swinging member Y. As a result, as described in the above-mentioned conventional example, the force for rotating the swinging member Y in the clockwise direction is not applied,
The tip 34 of the rocking member Y is attached to the eccentric cam 8 by the cam surface 81.
It is brought closer to the zero rotation axis 83 and maintains its position.
Then, the tip portion 34 comes into contact with the actuating projection 82, the support plate 90 rotates clockwise as described in the conventional example, and the tip 91 thereof moves to the left side (Y1 side), and the locking not shown. Move the board to the left. As a result, FF by the locking plate
The locking of the operation lever 21 for FF is released, and the operation lever 21 for FF is moved to the original non-actuated position by the urging force of the spring (not shown).

Next, instead of the FF operation lever 21,
Pushing the REW operation lever 22 is substantially the same as pushing the FF operation lever 21. However, when the REW operation lever 22 is pushed in and the tape running motor is driven, the left reel shaft 70 (not shown) rotates clockwise, unlike when the FF operation lever 21 is pushed in. Then, as the tape runs, the reel shaft 70 on the right side rotates in the clockwise direction, and the protrusion 71b of the pressing member 71 moves the swinging member Y.
The right side pressed surface 33 is pressed to rotate the swinging member Y clockwise.

The member for pressing the pressed portion 54 of the lever 51 is not the operating protrusion 21b of the FF operating lever 21 but the operating protrusion 22b of the REW operating lever 22. Others are the same as the case where the FF operation lever 21 is pushed in, and the description is omitted.

(When the head mounting plate H is in the operating position)
In FIG. 2, when a tape reproducing operation lever (not shown) is pushed in, the head mounting plate H is displaced to the back (X2 side).

Further, as in the case where the tape fast-forwarding operation lever F is pushed in, the tape running motor rotates,
The eccentric cam 80 and the reel shaft 70 rotate. At the position of the tape running direction switching plate K shown in FIG. 2, the rotation direction of the reel shaft 70 is the winding direction, that is, the counterclockwise direction. Then, the protrusion 71a of the pressing member 71 slidably attached to the reel shaft 70 presses the left pressed surface 32 of the rocking member Y, and the rocking member Y rotates clockwise.
Therefore, the tip end portion 34 of the swinging member Y abuts and slides on the cam surface 81 of the eccentric cam 80.

When the head mounting plate H is displaced inward, the portion of the engaging hole 61 engaged with the pin 59 of the lever 56 is released from the restriction hole 61a shown in FIG. 2 to the opening shown in FIG. It is changed to the hole 61b. By changing the engaging portion, the right lever 56 can freely rotate. Then, the spring 41 can freely swing around the shaft 42, and stops applying a force to the locking portion 36 of the swinging member Y.

In FIG. 2, the pin 59 of the left lever 56 (not shown) is located below the left engagement hole 61 (Z2).
Direction), the head mounting plate H cannot be freely rotated even when the head mounting plate H is displaced inward and reaches the position of the opening hole 61b. Is. Therefore, the swing member Y on the left side is biased by the spring 41 on the left side (not shown), and the tip portion 34 thereof is
Always contacts and slides on the left cam surface 81. Therefore, the left tape traveling stop detection device does not operate.

When the tape reaches the end and the running of the tape is stopped, the rotation of the reel shaft 70 is stopped and the protrusion 71a of the pressing member 71 does not press the left pressed surface 32 of the swinging member Y. As a result, as described in the above-mentioned conventional example, the force for rotating the swinging member Y in the clockwise direction is not applied,
As shown in FIG. 3, the tip end portion 34 of the swinging member Y is brought closer to the rotating shaft 83 of the eccentric cam 80 by the cam surface 81,
Maintain its position.

Then, the tip end portion 34 abuts on the actuating projection 82, the support plate 90 rotates clockwise about the capstan shaft 97, and the tip end 91 thereof moves to the left side (Y
1 side), the right side automatic engaging concave portion 2 of the tape running direction switching plate K is pressed to the left side, and the tape running direction switching plate K is moved to the left side. As a result, a gear mechanism (not shown) operates and the traveling direction of the tape is changed.

When the tape running direction switching plate K is displaced to the left side, the restricting portion 4 (see FIG. 2) formed on the tape running direction switching plate K is also displaced to the left side, and the right side shown in FIG. By pressing the pin 59 of the lever 56 and rotating the lever 56 on the right side, the line connecting the shaft 58 and the pin 59 becomes the front-back direction (X1, X2 direction). Therefore, in FIG. 3, the lever 56 shows the state before the tape running direction switching plate K is displaced to the left, and the state after the tape running direction switching plate K is displaced to the left. As described above, FIG. 3 is a diagram for explaining the progress of the operation of the tape traveling stop detection device, and the state shown in FIG. 3 does not actually exist.

The above is the case where the tape is wound on the right reel shaft 70 to reproduce the tape. However, when the tape is wound on the left reel shaft 70 (not shown) to reproduce the tape. The tape running direction switching plate K is not in the position shown in FIG. 2 but in a position displaced to the left. The regulating portion 4 is just displaced to the position for regulating the pin 59 of the right lever 56. As a result, when the head mounting plate H is pushed in,
Unlike the above-mentioned case, the left tape running stop detection device is activated.

(Modifications) The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-mentioned embodiments, and is within the scope of the gist of the present invention described in the claims. Thus, various changes can be made. A modified embodiment of the present invention is illustrated below. (1) In the embodiment, the tape recorder is an auto-reverse type, but the tape recorder can be used in a tape recorder having a unidirectional tape reproduction direction.

(2) In the embodiment, the tape traveling stop detecting device operates the tape traveling direction switching plate, but it is also possible to operate the locking plate for locking the tape traveling operation lever. is there. It is also possible to selectively actuate the tape running direction switching plate and the locking plate.

(3) In the embodiment, the lever 51 for displacing the one end 43 of the spring 41 is operated by the tape fast-forwarding operation lever F, and the lever 56 for locking the other end 44 of the spring 41 is the head mounting plate H. Although operated, the lever 51 can be operated by the head mounting plate H and the lever 56 can be operated by the tape fast-forwarding operation lever F.

(4) In the embodiment, the release member is a lever, but other members such as a pin may be used as long as the bias of the spring can be released.

[0070]

According to the present invention, the releasing device comprises the one end releasing member and the other end releasing member, the one end releasing member displaces one end of the spring, and the other end releasing member engages with the other end of the spring. ing. Therefore, if the releasing device is composed of one member, it is necessary to concentrate the members that operate the releasing device in one place, and it is difficult to arrange the operating member in a tape recorder having a small thickness. However, if the releasing device is composed of two members as in the present invention and the disposing places are separated from each other, it is possible to disperse and arrange the members that operate the releasing device in two places. Even in a tape recorder having a small size, the operating members are dispersed, so that the operating members can be arranged.

When the releasing device is arranged at one place, from the tape traveling operating lever such as the tape reproducing operating lever, the FF operating lever and the REW operating lever to the place where the releasing device is arranged. It is necessary to arrange the interlocking member. However, if the releasing device is composed of two members as in the present invention, it suffices to dispose the interlocking member from each tape running operation lever to the releasing member close thereto. If the release member is properly arranged, the interlocking member need not be arranged.

The actuating protrusion provided at the tip of the fast-forwarding tape operating lever presses the one-end releasing member, and the one-end releasing member displaces one end of the spring. Thus, the operating protrusion is provided at the tip of the fast-forwarding tape operating lever. There is some room in the tape recorder where the tip end is located, compared to the central portion of the tape fast-forward operation lever. Therefore, according to the present invention, it is possible to dispose the release member while avoiding a place where a large number of other members are arranged in the central portion of the tape fast-forwarding operation lever.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of a tape traveling stop detection device of a tape recorder of the present invention, and is a plan view showing a structural relationship with a tape fast-forwarding operation lever.

FIG. 2 is a view for explaining the same embodiment and is a plan view showing a structural relationship with a head mounting plate.

3 is a view for explaining the progress of the operation of the tape traveling stop detection device shown in FIG. 2, and is a plan view thereof.

FIG. 4 is a view for explaining a conventional example of a tape traveling stop detection device of a tape recorder, and is a plan view in a state where the tape recorder is stopped.

[Explanation of symbols]

 F Tape fast-forwarding operation lever H Head mounting plate Y Swing member 21b, 22b Operating protrusion 34 Tip 41 Spring 43 One end 44 The other end 51 Lever (one end releasing member) 56 Lever (other end releasing member) 80 Eccentric cam (rotation) Body) 81 Cam surface 82 Operating protrusion

Claims (2)

[Claims] 1. A rotating body (80) having a cam surface (81) and an actuating protrusion (82) formed while the tape running motor of the tape recorder rotates, and the rotating body (80) during tape running. The rocking member (Y) whose tip (34) abuts the cam surface (81) of the rocking member (80), and the tip (34) of this rocking member (Y) is the cam surface (8).
(1) A spring (41) for urging the swinging member (Y) in a direction of contacting the swinging member (Y), and a release device for releasing the urging force of the spring (41), and rotation of the tape running motor of the tape recorder. When the tape is running, the tip portion (34) of the swinging member (Y) is
Is in contact with the cam surface (81) of the rotating body (80), and when the tape running is stopped, the tip end portion (34) of the swinging member (Y) is moved to the cam surface (81) of the rotating body (80). When the tape traveling stop is detected, the tape traveling stop is detected by contacting the operating protrusion (82) of the rotating body (80), and the tape traveling operation lever is not operated so that the detection of the tape traveling stop does not malfunction. When in the position, the release device does not operate, the spring (41) urges the swing member (Y), and the tape playback operation lever, the tape fast-forward operation lever (F), and other tape running operation levers are operated. In the tape traveling stop detection device in which the release device is activated when in the operating position and the spring (41) does not bias the swinging member (Y), the release device releases one end (43) of the spring (41). One end release member ( 51) and the other end (4) of the spring (41)
4) is formed by the other end releasing member (56), and when the spring (41) is in the biased state, one end (43) of the spring (41) is the swinging member (Y) and the other end (44) is the other end. Material (5
6), and when either one of the tape reproduction operation lever or the tape fast-forward operation lever (F) is in the operating position, the other end releasing member (56) and the spring (41) are engaged. When the other one of the tape reproduction operation lever and the tape fast-forward operation lever (F) is released, the one end releasing member (51) displaces one end (43) of the spring (41), A tape running stop detection device characterized by releasing engagement between a spring (41) and a swing member (Y). 2. A rotating body (80) formed with a cam surface (81) and an operating protrusion (82) while the tape running motor of the tape recorder rotates, and the rotating body (80) during tape running. The rocking member (Y) whose tip (34) abuts the cam surface (81) of the rocking member (80), and the tip (34) of this rocking member (Y) is the cam surface (8).
(1) A spring (41) for urging the swinging member (Y) in a direction of contacting the swinging member (Y), and a release device for releasing the urging force of the spring (41), and rotation of the tape running motor of the tape recorder. When the tape is running, the tip portion (34) of the swinging member (Y) is
Is in contact with the cam surface (81) of the rotating body (80), and when the tape running is stopped, the tip end portion (34) of the swinging member (Y) is moved to the cam surface (81) of the rotating body (80). When the tape traveling stop is detected, the tape traveling stop is detected by contacting the operating protrusion (82) of the rotating body (80), and the tape traveling operation lever is not operated so that the detection of the tape traveling stop does not malfunction. When in the position, the release device does not operate, the spring (41) urges the swing member (Y), and the tape playback operation lever, the tape fast-forward operation lever (F), and other tape running operation levers are operated. In the tape traveling stop detection device in which the release device is activated when in the operating position and the spring (41) does not bias the swinging member (Y), the release device releases one end (43) of the spring (41). One end release member ( 51) and the other end (4) of the spring (41)
4) is formed by the other end releasing member (56), and when the spring (41) is in the biased state, one end (43) of the spring (41) is the swinging member (Y) and the other end (44) is the other end. Material (5
6) which is engaged with 6) and presses the one end releasing member (51) that displaces one end (43) of the spring (41).
22b) is provided at the tip of the tape fast-forwarding operation lever (F), and when the tape playback operation lever is in the operating position, the head mounting plate (H) for pressing the head against the tape.
(41) by the other end release member (56) by forward movement of
When the tape fast-forwarding operation lever (F) is in the operating position, the operation protrusions (21b, 22b) provided at the tip of the tape fast-forwarding operation lever (F) have the one-end releasing member (5).
1) The pressing operation is performed, the one end releasing member (51) displaces one end (43) of the spring (41), and the swinging member (Y).
A device for detecting stoppage of tape running, which is characterized in that the engagement is released.