JPS5916344B2 - Reel stand brake release mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reel stand brake release mechanism for a video tape recorder that controls the running of a tape using a plunger.

Magnetic recording and reproducing devices such as tape recorders are required to be configured to automatically control tape running by employing a microcomputer.

For this reason, it is preferable to use a plunger or the like to operate the tape running system, rather than the conventional configuration in which the tape running system is operated in conjunction with the pressing operation of a push button. Therefore, in view of the above-mentioned points, the present invention specifically proposes a reel stand brake release mechanism configured so that the tape running system of a cassette video tape recorder having a tape loading mechanism can be electrically operated. It is something.

The present invention will be explained below according to an illustrative embodiment.

FIG. 1 shows an embodiment of the present invention. In the figure, number 1 indicates 10. cassette 3 is a take-up reel stand, 4 is a supply reel stand, and 6 is a cassette shown by a dotted line. A first idler that drives the take-up reel stand 3 in rotation; 7 a second idler that transmits the rotation of the first idler 6 to the supply reel during rewinding; 8 a first idler 6 and the first idler 6; a first idler lever that supports a relay pulley 9 that transmits rotation to a relay pulley 9, is biased to rotate clockwise by a first spring coil 10, and is rotated counterclockwise during tape loading and tape rewinding; , 11 is a first belt for transmitting the rotation of the intermediate pulley 9i0 to the first idler 6;
2 is a second belt that transmits the rotation of the reel drive motor 13 to the intermediate pulley 9; 14 is a second idler lever that supports the second idler 7; and 15 is the second idler lever as shown in FIG. 5 One end is pivoted to the bar 14,
A first slide whose other end is loosely fitted into a second slide 32 to be described later.
The lever, 16, is a second spring coil, 1?, that pulls the second idler lever 14. a second lever 20 which is pivotally supported on the second shaft 18 and biased clockwise by a third spring coil 19 to bias the planting pin 5 of the first lever 15 upward; is the first link 21
22 is a third shaft that pivots 35 the first idler lever 8 on the first link 21; 23 is a fourth coil spring when the tape is stopped; A supply reel brake lever 24 is rotated counterclockwise to brake the supply reel stand 4, and 25 is biased clockwise to rotate by a fifth spring coil 26 when the tape is stopped. Take-up reel brake lever for braking the stand 3, 27
A brake plate spring 28 is arranged to apply a constant tension to the supply reel base 4 during loading, and one end is loosely fitted into a first slide 29 (to be described later), and the other end is pivotally supported by a second slide 32. 3 lever, 29 is the third lever 28
A first slide 32 whose one end is supported by the fourth shaft 30 and whose other end is supported by the winding wheel brake lever 25 and the fifth shaft 31 is pulled to the right in the figure by the sixth spring coil 23. The second slide 34 is moved to the left in the drawing when rewinding the tape and fast forwarding the tape. The link lever 37 is biased to rotate counterclockwise by a seventh spring coil 38, and the back tension lever 41 is equipped with a back tension detection pin 39 and a brake band 40 circumferentially surrounding the supply reel base 4. , leading guide 42,
A loading disk erects the first tape guide 43, second tape guide 44, and third tape guide 45 and swingably supports the pinch roller 46; 47 is a capstan that rotates integrally with the flywheel 48;
9 is a third belt that transmits the rotation of the capstan motor 50 to the flywheel 48; 51 is a pinch roller pressing lever that presses the pinch roller 46 against the capstan 47 at the tape mounting position; 52 is a third solenoid 57;
The third link 53 transmits the traction force through the fifth link 54 to the fifth lever 55 and the sixth coil spring 5.
The fourth link 58 is biased counterclockwise by a sixth spring coil 59, and when the tape loading is completed, the fourth link 58, which is buffered by the back tension lever 58, is rotated counterclockwise. The loading cam lever 61 is biased counterclockwise by the sixth coil spring 62, allowing the counterclockwise rotation of the tape loading cam lever 37 and closing the micro switch 60 for detecting the completion of tape loading. The third lever 27 is rotated clockwise as the pinch roller pressure contact lever 51 is rotated, and is loosely fitted into the second slide 32.
The third lever 27 is rotated counterclockwise by engaging with the planting shaft of the supply reel brake lever 2.
3 and a fifth lever for releasing the take-up reel brake lever 25; 63 is a guide cylinder fixed on the support base 64; 65, 66, 67, and 68 are fixed guide pins that define the running path of the tape; 69 is a fifth lever that releases the take-up reel brake lever 25; A fixed head for erasing and a fixed head 70 for recording and reproducing audio control signals are respectively shown. As shown in FIG. 1, when the tape is stopped, the first idler 6 is brought into rolling contact with the take-up reel stand 29, and the supply reel brake lever 23 is connected to the supply reel stand 4, and the take-up reel stand 3 is brought into contact with the first idler 6. The supply reel brake levers 25 are brought into pressure contact with each other to restrict rotation of both reel stands 3 and 4. When the force set is installed in such a state, a micro switch (not shown) closes and energizes the first solenoid 20 and the capstan motor 50.

Therefore, the capstan motor 50 drives the loading disk 41 counterclockwise via a loading disk drive mechanism (not shown) that is in rolling contact with the flywheel 48, while the first solenoid 20
The first idler lever 8 is rotated counterclockwise, and the brake lever 23 is released by the first idler lever 8 to allow the tape to be pulled out as the loading disk 41 is rotated. The tape is pulled out without slack by the bouncing tension provided by the brake leaf spring 28, and the tape is loaded. (See FIG. 2) After that, when the loading disk 41 reaches the tape loading end point, the loading cam lever 58 causes the roller to enter a notch (not shown) in the loading disk 41 and move counterclockwise. The micro switch 60 is rotated to close the micro switch 60, and the back tension lever 37 is allowed to rotate counterclockwise, while the loading mechanism is separated from the flywheel 48.

The micro switch 60, which is closed, deenergizes the capstan motor and the first solenoid 20, thereby stopping the rotation of the loading disk 41, turning the first idler 6 into contact, and closing the supply reel brake lever. 23
The back tension lever 13 rotates while making pressure contact with the
7 completes the tape guide path and comes to a halt. (See FIG. 3) In this state, when the record switch or playback switch (not shown) is further closed, the third solenoid 57
Then, the capstan motor 50 and the reel drive motor 13 are energized.

Therefore, the third solenoid 57 is connected to the pinch roller 46.
is brought into pressure contact with the capstan 47, and the fifth
The supply reel brake lever 2 is rotated by rotating the lever 61 clockwise and rotating only the third lever 27 counterclockwise without sliding the second slide 32.
3 and the take-up reel lever 25 are released, and the tape led out from the supply side with a constant tension is caused to travel at a constant speed by rotation of the capstan 47, and is wound onto the take-up reel side. (See FIG. 4) Next, when the fast forward switch (not shown) is closed in the stopped state shown in FIG. 3, where the recording or reproducing operation is ended by closing the stop switch, the second solenoid 36 Motor 13 is energized.

Therefore, the second solenoid 36 is connected to the second slide 32.
to the left in the figure and rotate the third lever 27 counterclockwise to release the pressure between the supply reel brake 23 and the take-up reel brake 25, and at the same time slightly release the back tension lever 37. The bending state of the tape path is alleviated by rotating it clockwise, and the tape is fed at high speed by the reel drive motor 13 energized with a high voltage.
(See FIG. 5) On the other hand, when the rewind switch (not shown) is closed in the stopped state of FIG.
Then, the reel drive motor 13 is energized, and then the second solenoid 36 is energized.

Therefore, first, by the energization of the first solenoid 20, the first idler 6 is moved away from the take-up reel stand 3 and brought closer to the supply reel stand 4, and the supply reel brake lever 23 is also applied with braking. The condition will be removed. Next, the second slide 32, which is slid by the urging of the second solenoid 36, moves the second idler 7 between the take-up reel stand 4 and the first slide in conjunction with the rotation of the second lever 17. The take-up reel brake lever 31 is brought into elastic contact with the idler 6 and rotated slightly counterclockwise to release the brake of the take-up reel brake lever 31, thereby energizing it with a high voltage. The rotation of the reel drive motor 13 is transmitted to the supply reel stand 4 to perform high-speed rewinding of the tape. (See FIG. 6) According to this embodiment, the first idler 6 and the second idler 7 are moved during rewinding to bring the take-up reel stand 4 and both idlers into a rolling contact state. In this case, the first idler 6 is moved first, and then the second idler 7 is brought into rolling contact with the first idler 6 and the take-up reel stand 4, so the second idler 7 is moved first. Compared to the case where the first idler 6 moves the second idler 7 at the same time, there is no need for the first idler 6 to move the second idler 7 backward, and the load on the first solenoid 20 that moves the first idler 6 is reduced.

Therefore, according to the present invention, the third solenoid 57 is activated without energizing both the second solenoid 36 for releasing the brake and the third solenoid 57 for pressing the pinch roller during the recording and reproducing period, which has the longest operating time. Since the structure is configured such that the fluke is released in conjunction with the energization of , power consumption is reduced and the effect is great.

[Brief explanation of the drawing]

The figures show a mechanism according to an embodiment of the present invention, in which Fig. 1 is a plan view in a stopped state, Fig. 2 is a plan view in the middle of loading, Fig. 3 is a plan view in a completed loading state, and Fig. 4 is a plan view in a playing state. 5 is a plan view of the fast-forwarding state, FIG. 6 is a plan view of the rewinding state, and FIG. 7 is a plan view of the main mechanism. Explanation of main drawing numbers, 36... Solenoid (brake release solenoid), 32... Second slide (slide), 27... Third lever (rotating Leno Kuichi), 23... Supply reel brake lever, 25... Take-up reel brake lever, 57...
...Third solenoid (pinch roller pressure contact solenoid), 51...Pinch roller pressure contact lever 6
1...Fifth lever (relay lever).

Claims (1)

[Claims] 1. A brake release solenoid 36 that is energized during rewinding and fast forwarding, a slide 32 that moves to the second position by the energization of the solenoid, and a slide 32 that loosely fits into the slide and moves to the second position by the energization of the solenoid. A rotary lever 27 that rotates to the second position, a pair of brake levers 23 and 25 that release the brakes on the supply reel stand and the take-up reel stand as the rotary lever rotates to the second position; and a pinch roller pressure contact solenoid 57 that is only energized during recording.
, a pinch roller pressure contact lever 51 that moves to a second position by the energization of the solenoid and presses the pinch roller against the capstan, and a pivot lever 51 that moves in conjunction with the movement of the pinch roller pressure contact lever to the second position. A reel stand brake release mechanism characterized in that a relay lever 61 for rotating the reel stand to a second position is provided.