JPH0223932B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides brake control timing and reel motor control timing when switching modes in a tape recorder.
This invention relates to a mode switching method that optimizes ON and OFF timing.

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. During the mode switching, the timing at which the brake comes into contact with the reel stand and stops the reel stand does not match the timing at which the reel motor turns ON and OFF.
In other words, in the song interval detection mode, the reel motor is de-energized after detecting the song interval, and the brakes are applied after a short delay, so the reel stand rotates slightly due to the inertia of the motor and the reel motor is turned off. There may be an overrun for blanks in between. Further, in the fast-forward and rewind modes, the timing at which the reel motor stops and the brake is applied is different from the timing at which the reel motor is stopped, causing tape slack, which causes tape winding, and other disadvantages.

The present invention has been made in view of the above points, and its purpose is to match the timing at which the reel motor stops and the brake is applied so that the reel motor can pass through a blank between songs in the inter-song detection mode. Another object of the present invention is to provide a mode switching method in a tape recorder that does not cause 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 running 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 contact 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.

Further, in this embodiment, the rotation amount of the large gear 5 is detected by the angle sensor 7, that is, the angle sensor 7 detects the rotation amount of the large gear 5 at each point (a) to (d) shown in FIG. Outputs ON and OFF signals that control the rotation of the In other words, the protruding portion 5 of the side cam 5c
c ₁ , 5c ₂ causes the brake arm 8 to move clockwise,
Alternatively, the brake 11 may be rotated counterclockwise.
The angle sensor 7 detects the reel motor when the reel a, 11b is pressed against the reel stand 9, 10 or just before it is separated from the reel stand 9, 10.
Sends ON/OFF signals to drive or stop the reel motor. Therefore, since this is done in synchronization with the ON/OFF of the reel motor and the ON/OFF of the brake operation, when detecting a song interval and stopping tape running in the song interval detection mode, the reel motor OFF and the brake operation are turned off. There is no possibility that the timing with ON will deviate and the tape will pass between songs, and the fast forward, rewind mode,
There is no possibility that the tape becomes loose when transitioning from play mode or inter-track detection mode to stop mode.

As described above, the present invention uses a cam to control the brake arm that controls the brake to the reel stand, and detects the rotation of this cam with an angle sensor, and controls the contact between the brake and the reel stand and the turning on of the reel motor. , and the OFF timing, it is possible to perform stable tape running without causing an overrun after detecting a song gap in the song gap detection mode and without tape slack. Furthermore, since the timing is not dependent on the time setting, the timing is determined regardless of the mechanical operation time, which has the effect of eliminating malfunctions and increasing 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. Controls ON/OFF of the reel motor, brake timing in each mode and ON/OFF of the reel motor
A mode switching method in a tape recorder, characterized in that the mode switching method is made to match the timing.