JPH0223933B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mode switching method for a tape recorder, which optimizes the control timing of the pinch roller and the ON/OFF timing of the reel motor during the play mode.

Conventionally, tape recorders have been known that use the rotational force of a motor to switch modes, that is, the motor rotates a cam and the cam drives members such as a head base, pinch roller, and brake to switch to various modes. ing.

By the way, in the mode switching method of this type of tape recorder, the mode switching is performed in the following order: eject mode → stop mode → fast forward, rewind mode → inter-track detection mode → pause mode → play mode. However, when transitioning to the play mode, the timing of the pinch roller contacting the capstan and the timing of the reel motor are determined.
There may be a difference between the ON and OFF timings. In other words, there is a difference between the timing when the pinch roller sends out the tape and the timing when the reel motor winds the tape, causing the tape to wind at high speed for a moment or the tape to become slack. There were drawbacks such as:

The present invention has been made to correct the above-mentioned drawbacks, and its purpose is to ensure that the timing at which the pinch roller contacts the capstan coincides with the ON/OFF timing of the reel motor during the play mode. An object of the present invention is to provide a mode switching method in a tape recorder that can prevent instantaneous high-speed tape feeding and tape slack.

An embodiment of the present invention will be described below with reference to FIG. 2 and subsequent figures.

In Figs. 2 to 4, reference numeral 1 denotes a drive motor, whose rotation is caused by a belt 2 to a pulley 4 having a gear 3.
This gear 3 is transmitted to the large gear 5 that meshes with the gear 3 at a reduced speed.

The large gear 5, pulley 4, and drive motor 1 are configured to rotate in a plane parallel to the running plane of a cassette tape mounted on the front surface of the chassis A.

The large gear 5 is supported in a bearing hole 5a at one end by a protruding shaft 6a protruding from a connecting frame 6 that connects the chassis A and the sub-chassis B, and is also supported by a square shaft 7a of an angle sensor 7 attached to the sub-chassis B. A square hole 5b at the other end is fitted and supported, and an angle sensor 7 senses the rotation angle of the large gear 5, and the drive motor 1 is driven to rotate the large gear 5 by a required angle and then stopped.

Two side cams 5c and 5d are installed on the side of the large gear 5.
is provided, and one end of a brake arm 8 is pressed against the inner peripheral surface of this side cam 5c. The other end of this brake arm 8 is connected to a brake stand 11 having brakes 11a and 11b that are in contact with reel stands 9 and 10 that fit on a reel of cassette tape and feed or take up the tape, and brake these. has been done. In addition, brake arm 8
The approximate center of is pivotally connected to chassis A. Further, one end of an operating arm 12 is pressed against the outer peripheral surface of the side cam 5d. The other end of this operating arm 12 is equipped with a recording/playback head 13 and an erasing head 14.
A head stand 16 is also connected to a pinch roller 15 which is pivotally supported by the chassis A. Note that the approximate center of the operating arm 12 is also pivotally connected to the chassis A.

Therefore, by rotating the large gear 5 by a required angle, these brake arms 8 and operating arms 1
2 is operated by the side cams 5c and 5d, and the brake 1
1a and 11b touch the reel stands 9 and 10 to brake them, and the pinch roller 15 touches the capstan 1.
7, and the recording/playback head 13 and erasing head 14 are brought into contact with the tape to move them to positions corresponding to various modes such as recording, playback, fast forward, rewind, and pause. All these operations are performed in a plane parallel to the tape installation plane.

Next, side cams 5c and 5d formed on the large gear 5
The details and the operations of the brake arm, head stand 16 and pinch roller 15 will be explained.

The side cams 5c, 5d are formed in shapes as shown in FIGS. 4 and 5. That is, the side cam 5c
has two protruding parts 5c ₁ and 5c ₂ , and when one end of the brake arm 8 is located at this position, the brake arm 8 is rotated clockwise and the brake base 11 is moved downward in FIG. The brake 11a and the brake 11b abut against the reel stand 9 and the reel stand 10, respectively, to stop the rotation of the reel stands 9 and 10. Then, when the large gear 5 rotates in the direction of the arrow, the brake arm 8 is rotated counterclockwise at a portion other than the protruding portions 5c ₁ and 5c ₂ , and the brake stand 11 moves upward, and the brakes 11a and 11b are respectively reel stand. It's far away from 9 and 10.

On the other hand, the side cam 5d is formed in a spiral shape whose length from the center gradually increases, and the minimum diameter portions 5d ₁ , 5
d ₂ , 5d ₃ , an intermediate diameter portion 5d ₄ with a larger diameter,
5d ₅ and a maximum diameter portion 5d ₆ . Then, actuating arms 1 are placed at the minimum diameter portions 5d ₁ , 5d ₂ , 5d _{3 .}
2, the operating arm 12 is rotated clockwise, the head stand 16 is moved downward in FIG. , and the pinch roller 15 is also far away from the capstan 17. This state corresponds to eject mode, fast forward, rewind mode, and stop mode.

Next, the large gear 5 rotates, and when one end of the actuating arm 12 is located at the intermediate diameters 5d ₄ and 5d ₅ , the actuating arm 12 is rotated counterclockwise to raise the head stand 16 and move the recording/playback head 13 , erase head 14
lightly contact the tape, and pinch roller 15
is also brought close to the capstan 17. This state corresponds to the song interval detection mode and the pause mode.

Furthermore, when the large gear 5 rotates and one end of the actuating arm 12 is positioned at the maximum diameter portion _5d6 , the actuating arm 12 is further rotated counterclockwise, pushing up the head stand 16 and moving the recording/playback head 13 and erasing While pressing the head 14 against the tape, the pinch roller 1
5 to the capstan via the tape. This state is the play mode.

The central angles of the side cams 5c and 5d in each mode are the same, and the braking operation, the recording/reproducing head 13, the erasing head 14, and the pinch roller 15 operate as shown in FIG.

In this embodiment, as described above, the side cam 5
c, 5d, the brake arm 8 and actuating arm 12 are operated in the order of eject mode → fast forward, rewind mode → stop mode → inter-track detection mode → pause mode → play mode, so fast forward, rewind and When changing from the inter-track detection mode to the stop mode, the timing at which the brake is applied, that is, the time from when a stop signal is input until the tape stops is shortened.

In this embodiment, the rotation amount of the large gear 5 is detected by the angle sensor 7, and in other words, the signal to turn on the reel motor at the position (a) where the pinch roller 15 abuts the capstan 17 is detected by the angle sensor 7. The sensor 7 outputs a signal to turn off the reel motor at the position (a) where the pinch roller 15 leaves the capstan 17. In other words, the operating arm 12 is rotated counterclockwise or clockwise by the side cam 5d, and the head stand 1 is rotated.
6 moves forward or backward, and just before the pinch roller 15 comes into contact with or leaves the capstan 17, the angle sensor 7 loses the signal for turning the reel motor ON or OFF, and drives or stops the reel motor. Therefore, ON/OFF of the reel motor
Since the pinch roller 15 approaches and separates from the capstan 17 in synchronization, instantaneous high-speed tape feeding and tape slack do not occur in the play mode.

As described above, the present invention uses a cam to control the actuating arm that controls the pinch roller's contact with and separation from the capstan, and detects the rotation of this cam with an angle sensor, thereby adjusting the timing of the pinch roller's contact with and leaving the capstan and the reel motor. By making the ON and OFF timings coincide with each other, there is no temporary high-speed feeding of the tape or tape slack in the pre-mode, and stable tape running can therefore be achieved. Further, since the timing is not dependent on the time setting, the timing is determined regardless of the mechanical operation time, so there are advantages such as no malfunction and high reliability.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a mode switching order for explaining a mode switching method in a conventional tape recorder, and FIGS. 2 to 7 show an apparatus and diagrams for implementing the mode switching method according to the present invention. Figure 2 is a perspective view of the drive part, Figure 3 is a cross-sectional view of the same as above,
Fig. 4 is a perspective view of the control part, Fig. 5 is a front view of the side cam part, Fig. 6 is a line diagram showing the mode switching order of the present invention, and Fig. 7 is the timing of ON/OFF control of the reel motor. FIG. 1...Motor, 5c, 5d...Side cam, 8...
... Brake arm, 9, 10 ... Reel stand, 11
a, 11b... Brake, 12... Actuation arm,
13...recording/playback head, 14...erasing head,
15...pinch roller, 16...head stand.

Claims (1)

[Claims] 1. In a tape recorder in which the brake, head stand, and pinch roller are sequentially switched to each mode by controlling the amount of rotation of a cam rotated by a motor, an angle sensor is provided to detect the amount of rotation of the cam, and a signal from this angle sensor is provided. A mode switching method in a tape recorder, characterized in that the ON and OFF of the reel motor is controlled so that the timing of contact with the pinch roller capstan in play mode coincides with the ON and OFF timing of the reel motor. .