JPS6112599Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a tape recorder with a so-called cue function that automatically shifts to the next mode by detecting a predetermined position (for example, between songs) on a running magnetic tape. This invention relates to a head board operating device.

Looking at this kind of conventional device, as shown in Fig. 1, the magnetic heads 2a and 2b are moved from the stop position to the playback position where they come into contact with the magnetic tape T by operating the playback lever 1, and are held there for playback. By operating the fast-forward lever 3 or remand operation lever 4, the head board 2, which is in the state of It performs a cueing operation that slightly touches the tape T, holds it, and feeds the magnetic tape at high speed while reproducing the signal on the magnetic tape with the magnetic head, and furthermore, by detecting a predetermined position Then, the operating state of only the fast-forward or return lever is released, the above-mentioned playback state is returned again, and playback is started from a predetermined position.

However, in such a conventional device, when the regeneration lever 1 is operated, the head board 2 is moved by the first spring _S1.
A second spring S1 _' (having an overstroke absorbing function) is interposed between the regeneration lever 1 and the head board 2 to bring the head board 2 from the stop position to the regeneration position. Mode switching for retracting from the playback position to the cueing mode position must be performed against the strong repulsive force of the second spring S ₁ ′, and therefore, there is The components for retracting the head board 2 are required to have considerable strength.
This was an obstacle to making the device smaller and lighter.

The present invention has been devised in view of the drawbacks of the conventional device, and one embodiment thereof will be described in detail below with reference to the accompanying drawings.

FIG. 2 is a plan view of essential parts showing the stop mode of a tape recorder equipped with the device according to the present invention, in which a head board 7 is attached to a chassis (not shown) so as to be slidable in the vertical direction in the figure. , is normally biased downward (towards the stop position) by a return spring _S2 that is connected to a pin _P1 on the chassis. A pinch roller lever 8 is rotatably supported on a shaft _P2 protruding from the chassis, and a pinch roller 9 is rotatably supported on the pinch roller lever 8 via a shaft 8a.
The pinch roller 9 sandwiches and presses the magnetic tape T against a capstan 10 which is rotated at a constant speed by a rotary drive means (not shown), thereby causing the magnetic tape T to run at a constant speed. The pinch roller lever 8 is energized by a spring S ₃ via an abutting piece 8b at one end thereof and a pin 7a fixed to the head board 7, so that the abutting piece 8b is pressed against the bent piece 7b of the head board 7.
is engaged in.

A reproduction lever 11, a fast forward lever 12, and a rewind lever 13 are also attached to the chassis so as to be slidable in the vertical direction in the figure. Each of these operating levers is constantly given a downward return force by an energizing means (not shown), and the playback lever, fast-forwarding lever, and rewinding lever are each independently locked to the operating position by a locking means (not shown). It is configured to be locked to These fast forward and rewind levers feed the tape at high speed using a well-known mechanism. The chassis is also provided with a slide lever 14 that is slidable in the vertical direction in the figure, and is normally pushed downward by a spring _S4 applied between it and a pin _P3 on the chassis. Forced. When the slide lever 14 is operated, its pressed portion 14a is pressed by the pressing pins 12a and 13a provided on the aforementioned fast-forward and rewind levers 12 and 13, respectively, and is pushed by the urging force of the spring _S4 . Slide upward. This slide lever is also provided with a cam portion C on one side edge thereof, and this cam portion C is constituted by a lower surface C ₁ , an inclined surface C ₂ , and an upper surface C ₃ .

The regeneration lever 11 has a "shaped rotating lever 15".
is rotatably supported by a shaft 11a.
This rotating lever 15 is urged to rotate clockwise in the figure by a spring S5 applied between a bent portion 15a provided at one end and a pin 7c on the head board 7. Due to the force, the pressing part 15b formed at the same end is brought into contact with the bent part 7d of the head board 7, and the engaging pin 15c provided at the other end is brought into contact with the cam part C of the slide lever 14 (when stopped, It engages with the lower surface C ₁ ). Note that this spring _S5 is an interference member to absorb the overstroke when the regeneration lever 11 is locked, and if so much precision is not required, the spring _S5 can be omitted as shown in Fig. 5. and bending part 15
A may be configured to directly contact the pressing portion 7c of the head substrate 7.

H ₁ and H ₂ are the recording heads fixed to the head board, respectively.
They are a playback head and an erase head. Further, pin _P4 is a regulating pin protruding from the chassis, and is used to position the playback position of the head board. still,
If an overstroke absorption mechanism is not provided, this pin is omitted, and the playback position of the head board is determined by locking the playback lever.

The present invention is constructed as described above,
The effect will be explained below.

(1) Regarding mode switching from stop mode to playback mode; Now, in the stop mode as shown in FIG. Similarly, in order to move forward, the engaging pin 15c on the lever slides on the cam portion C of the slide lever 14 and moves to the upper surface _C3 . (It is assumed that the return spring _S4 of the slide lever 14 has the strength to overcome the upward pressing force caused by the friction between the cam portion C and the engagement pin 15c.) As a result, The rotary lever 15 moves forward together with the reproduction lever 11, and simultaneously rotates slightly counterclockwise in the figure about the shaft 11a. By the operation of the rotation lever 15, the head board 7 is given an operating force via the spring _S5 , and moves forward until it hits the return spring _S2 and its front edge abuts the regulation pin _P4. . As the head board moves forward, the heads _H1 and _H2 come into contact with the magnetic tape T, and the pinch roller lever 8 is rotated clockwise in the figure about the axis _P2 via the spring _S3 . Then, the pinch roller 9 is pressed against the capstan 10 with the tape T sandwiched therebetween. (still,
The spring _S5 shall be strong enough to overcome the operating resistance of the springs _S2 and _S3 , the head board, the pinch roller lever, etc. ) With the above, the tape recorder is in the playback mode where the head board 7 takes the playback position as shown in FIG. The drive causes the magnetic tape T to run at a constant speed, and the recorded information on the magnetic tape T is transferred to the recording/playback head.
Reproduced by H ₁ .

In the embodiment shown in FIG. 5 which does not have an overstroke absorbing mechanism, the head substrate 7 advances with an overstroke which is exactly the same as the overstroke of the playback lever 11, and is held in the playback position by the lock of the playback lever 11.

(2) Regarding mode switching from playback mode to cueing mode; In the playback mode mentioned above, press fast forward lever 1.
2 as shown in the figure, the lever 12
The slide lever 14 slides upward under the force of the return spring _S4 due to the pressure of the press pin 12a provided above. For this reason, the return spring S ₂ of the head board 7 (spring S ₃ before the pinch roller is separated from the capstan)
Also included. ), the engaging pin 15c of the rotary lever 15, which was biased to rotate clockwise around the shaft 11a via the head board 7 and the spring _S5 , engages the cam portion of the slide lever 11. C
Move from the upper surface _C3 to the lower surface _C1 as shown.
Therefore, the rotating lever 15 rotates slightly clockwise about the shaft 11a, and the head board 7, which was held in the reproducing position by this lever, is moved by the biasing force of the return spring _S2 (the pinch roller 9 is Until it separates from the capstan 10, it is slightly retracted by the force applied by the spring _S3 .). That is, it moves back a little to the cue position. At the same time, as the head board retreats, the pinch roller lever 8 moves its abutting piece 8b towards the head board 7.
The pinch roller 9 is pressed by the bent portion 7b and rotates counterclockwise about the axis _P2 , thereby separating the pinch roller 9 from the capstan 10.

The tape recorder is now in the fast-forward cueing mode where the head board 7 takes the cueing position as shown in Figure 4. In this mode, the reel stand is driven at high speed, so that the magnetic tape T is As the magnetic tape T is being run, a predetermined position on the tape is searched for by the recording/playback head _H1 , which is lightly in contact with the magnetic tape T.

In this cue mode, when a predetermined position on the magnetic tape is detected by a cue circuit (not shown) through the recording/playback head, only the fast forward lever 12 is unlocked by a lock release means (not shown). , the lever 12 is returned to the non-operating position by the biasing force of a return spring (not shown).

Since the slide lever 14 is moved back by the spring _S4 in conjunction with the return of the fast-forwarding lever 12, the rotating lever 15 moves its engagement pin 15c from the lower surface _C1 of the cam portion C again to the upper surface _C3. is,
As a result, the rotation lever 15 is moved by the return spring S ₂
The head board 7 is rotated counterclockwise in the figure.
is again moved to the playback position, and the pinch roller 9 is brought into contact with the capstan 10.

Therefore, each of the magnetic heads H ₁ and H ₂ comes into strong contact with the magnetic tape T again, and as the fast-forward lever 12 returns, the high-speed drive mechanism stops, and the tape recorder returns to the above-mentioned playback mode and returns to the above-mentioned predetermined position. The performance begins.

Note that cueing by operating the rewind lever 13 and cueing by operating the fast-forward lever 12 are the same except that the running direction of the tape is opposite.
For convenience, explanation is omitted.

The present invention is constructed as described above, and does not force the head board to retreat by further bending the spring for absorbing overstroke, which is the case in conventional equipment, so it is not possible to forcibly move the head board backward by further bending the spring for absorbing overstroke. This eliminates the need for the device to be very strong, allowing it to be made smaller and lighter.

In addition, since the overstroke absorbing spring is not used as an interference member when the head board retreats to the cueing position, low-priced tape recorders that do not require an overstroke absorption mechanism can also use the cueing mechanism. can be provided. Further, when changing the mode from the stop mode to the regeneration mode, the rotary lever rotates in the direction of advancing the head board, so the operating stroke of the regeneration lever can be made smaller than in the prior art.

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts showing a stop mode of a tape recorder equipped with a conventional device, and FIGS. 2 to 4 are stop mode, playback mode, and cue mode, respectively, of a tape recorder equipped with a device according to the present invention. FIG. 5 is a plan view of the main parts of a tape recorder having another embodiment of the present invention. 7...Head board, 11...Reproduction lever, 1
2, 13...Fast forward (rewind) lever, 14...
Slide lever, 15... Rotating lever.

Claims (1)

[Scope of utility model registration request] The magnetic head is moved forward and backward so as to take a stop position where it is separated from the magnetic tape, a playback position where the magnetic head is in contact with the magnetic tape, and an intermediate position where it is slightly retreated from this playback position in the direction of the stop position. A head board that can slide, a playback lever means, a high-speed feed lever means, a slide lever means that operates in conjunction with the high-speed feed lever means and has a cam portion, and a slide lever means that is pivotally supported by the playback lever means. , and a rotating lever having one end engaged with the head board and the other end engaging the cam part, and the rotating lever is moved forward by the operation of the regeneration lever means, and based on the advancement, the above-mentioned The head board is moved from the stop position to the playback position by the first rotation of the rotary lever obtained from the cam portion, and the playback mode is set. moving the slide lever and, based on the movement of the slide lever, moving the head board to the intermediate position by a second rotation of the rotary lever obtained from the cam portion in a direction opposite to the first rotation; A tape recorder head board operating device characterized by: