JPH0222818Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an automatic stop device for a cassette tape recorder.

(b) Prior Art Conventional mechanical automatic stop devices include a tension lever that is displaced when winding of a cassette tape is completed, and a tightening lever that enters an engagement path with an engagement protrusion on a take-up reel stand by the tension lever. and the lock lever is engaged with the engagement protrusion of the take-up reel stand and rotated by the rotational force of the lock lever, thereby moving the lock lever and unlocking the lock lever and the playback operating lever. It is also well known to use the rotational force of a flywheel instead of the rotational force of a take-up reel stand to rotate the knife lever.

In a headphone tape recorder that is smaller and thinner, the motor is also smaller and thinner, and the starting torque of the motor is lower. For this reason, in the automatic stop device as described above, it is preferable to use the rotational force of the take-up reel stand to rotate the tightening lever.

However, in the case where the other end of the tightening lever is engaged with the engagement protrusion of the take-up reel stand, although the return spring is connected to the tightening lever, the engagement protrusion and the other end of the tightening lever are frictionally connected. The lock lever remains engaged and cannot immediately return to the exit direction. Therefore, after the regeneration operation lever is unlocked by moving the lock lever in the forward direction as the lock lever rotates, the lock lever returns to its original position. There is a concern that when moving in the direction, the tightening lever rotates in the opposite direction and slightly rotates the take-up reel stand in the opposite direction to the tape winding direction via the engagement protrusion, resulting in loosening of the tape. Ta.

In order to solve this problem, some brake devices have been prepared, but this increases the number of parts and costs.

(c) Purpose of the invention This invention was proposed in order to solve such problems, and aims to solve the problem of tape slack, which was a concern in the past, by partially improving the tight lever. It is.

(d) Structure of the invention The present invention has one end connected in an interlocking relationship with a lock lever of a reproduction operation lever, and the other end engaged with a take-up reel stand in response to a tension lever that is displaced when tape winding is completed. In a cassette type tape recorder, the cassette type tape recorder has a locking lever that enters into an engagement passage with a mating projection, and the rotation of the locking lever releases the lock between the locking lever and the operating lever and retracts the head slide from the operating position to the stop position, The tightening lever is provided with a control section, and when the head slide is retreated, the control section is configured to forcibly move the other end of the tightening lever out of the engagement passage with the engagement protrusion.

(E) Embodiments Below, embodiments of the device of the present invention shown in the drawings will be described.

1 has a recording operation lever 2, a playback operation lever 3, a rewind operation lever 4, a fast-forward operation lever 5, a stop operation lever 6, and a pause operation lever 7 that can be freely moved in the direction of arrow A-A'. The provided chassis 8 is movably provided on the chassis 1 in the direction of arrow A-A', and is moved in the direction of arrow A against a spring (not shown) by operating the regeneration operation lever 3. A head slide that moves forward from a stop position to an operating position; reference numerals 9 and 10 shown by dotted lines denote an erasing head and a recording/playback head provided on the head slide 8; 11 a supply reel stand; 12
is the take-up reel stand. 13 is provided on the lower surface of the chassis 1 so as to be movable in the direction of arrow B-B';
This is a lock lever that is biased in the direction of arrow B by a spring 14, and the lock lever 13 has a lock protrusion that engages with the lock step 3' of the operating lever 3 for locking the operating position of the operating lever 3 for regeneration. 13' is provided, as well as an interlocking protrusion 13'' for interlocking with a tension lever to be described later. Reference numeral 15 designates a tension lever rotatably provided on a support shaft 16 on the head slide 8 as a fulcrum. A chip 15a for detecting the tension of the tape 17 is provided at one end, and an operating portion 15b is provided at the other end.

Reference numerals 18 and 18 are engagement protrusions provided on the take-up reel stand 12. 19 is the shaft 20 on the chassis 1
It is a lock lever in which a long hole 21 is combined with a lock lever, an interlocking recess 19' formed at one end engages with an interlocking protrusion 13'' of the lock lever 13, and an engaging piece 19'' formed at the other end engages with the winding recess 19'. It is arranged so as to enter the engagement passage 1 with the engagement protrusions 18, 18 of the reel stand 12, and is always urged in the withdrawal direction by the spring 22. The tightening lever 19 is provided with a control protrusion 19a facing the operating portion 15b of the tension lever 15, and a control pin 1 facing the end 8a of the head slide 8.
9b is provided.

Since the device of the present invention is constructed as described above, when the regeneration operation lever 3 is operated as shown in FIG. Once locked, the head slide 8 is advanced to the operative position so that the erasing head 9 and the recording/playback head 10 are in contact with the tape 17. The tip 15a of the tension lever 15 bends the tape 17 in an F-shape, and the tension lever 19 has an engagement piece 1 at the other end.
9'' is in a position where the engagement protrusions 18, 18 of the take-up reel stand 12 have exited the engagement passage l.

Therefore, in this tape playback state, tape 1
When winding of tape 7 is completed and the tape tension increases, the tension lever 15 rotates counterclockwise via the tip 15a, and the tension lever 19 is operated against the spring 22 by its operating portion 15b. That is, the engagement piece 19'' of the tightening lever 19 enters into the engagement passage l of the engagement protrusions 18, 18 of the take-up reel stand 12, and the counterclockwise rotational force of the take-up reel stand 12 causes the engagement piece 19'' The sharp lever 19 rotates clockwise.

This clockwise rotation of the lock lever 19 causes the lock lever 13 to move forward in the direction of arrow B'.
As a result, the regeneration operation lever 3 is unlocked,
At the same time as the regeneration operating lever 3 returns to the non-operating position, the head slide 8 also retreats from the operating position to the stop position and enters the stopped state.

In the device of the present invention, this head slide 8
When the lever returns to the stop position, its end 8a touches the control pin 19b of the lever 19, as shown in FIG.
and the engagement piece 1 at the other end of the tightening lever 19
9'' is forcibly withdrawn from the engagement passage l with the engagement protrusions 18, 18 of the take-up reel stand 12.

Therefore, after the lock lever 13 moves forward in the direction of arrow B' to release the lock on the regeneration operation lever 3, when the lock lever 13 moves back in the direction of arrow B, a counterclockwise rotational force is applied to the lock lever 19. Even if the tape is rotated, the take-up reel stand 12 is not rotated in a direction that loosens the tape.

(f) Effects of the invention Since the present invention is constructed as described above, it uses a tension lever that detects changes in tape tension and an automatic stop device that utilizes the rotational force of the take-up reel stand. To reliably prevent the lock lever, which receives the rotational force of the take-up reel stand and rotates to transmit force to the lock lever, from remaining frictionally engaged with the engagement protrusion of the take-up reel stand. Therefore, it is possible to eliminate the occurrence of tape slack during automatic stop without providing a brake device as in the conventional case, which is useful in practice.

[Brief explanation of drawings]

The figures show an embodiment of the device of the present invention, with FIG. 1 being a plan view during playback and FIG. 2 being a plan view during stop. 3... Reproduction operation lever, 8... Head slide, 12... Take-up reel stand, 13... Lock lever, 15... Tension lever, 18... Engagement protrusion, 19... Tight lever, 19b... Tight lever A control section installed in the.

Claims (1)

[Scope of utility model registration request] One end is connected in a dynamic relationship to the lock lever of the playback operation lever, and the other end enters the engagement passage with the engagement protrusion of the take-up reel stand in response to a tension lever that is displaced at the end of tape winding. In a cassette type tape recorder having a lock lever, the lock lever and the operating lever are unlocked by rotation of the lock lever, and the head slide is moved back from the operating position to the stop position. An automatic stop device for a cassette-type tape recorder, characterized in that when the slide slide is retreated, the control section is used to forcibly move the other end of the lock lever out of the engagement path with the engagement protrusion.