JPS6023801Y2 - Reel braking mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reel braking mechanism that allows the tape to be fed when the tape in a cassette is mounted on the circumferential surface of a cylinder.

In a cassette type video tape recorder, loading the tape onto the cylinder is essential, and requires time for loading the tape.

Therefore, in order to speed up recording and playback, a mechanism has been put into use in which the tape is loaded in advance in conjunction with the loading of the cassette.

In order to operate such a mechanism without any trouble, it is necessary to allow the tape to be pulled out when loading the tape, and to prevent rotation of the reel once loading is completed to prevent the tape from loosening.

Further, for convenience of recording while at home, if the cassette loading state is set to the standby state, it is necessary to prevent the reel from rotating before the tape is loaded.

Further, the tape tension detection means must be placed in a non-operating position when the tape is not loaded, and must be rotated to an operative position when the tape is loaded.

The present invention has been developed in view of the above points, and includes a mounting position detecting means that detects the position of the tape mounting means and displaces the tape mounting means, and this means prevents rotation of the reel before the tape is mounted. At the same time, the tape tension detection means is locked in the non-operating position, the reel is allowed to rotate during the tape loading operation, and when the tape loading is completed, the reel is prevented from rotating again. A reel braking mechanism is provided that rotates the tape tension detection means to the operating position upon completion of loading.

The present invention will be described below with reference to an illustrative embodiment.

The figure shows a schematic plan view of the main parts of the mechanism of this embodiment with the base omitted. For convenience, the pivots that rotatably support the members installed on the board are shaded to distinguish them from the connecting shafts and retaining pins. It is.

In the figure, number 1 is the supply reel stand, 2 is the take-up reel stand, 3 is the back tension lever that is biased counterclockwise by the first spring 3b around the first pivot 3a, and 4 is the press of the eject button. 5 is an eject lever that is locked by sliding in the direction of arrow A; 5 is a pause lever that is locked by sliding in the direction of arrow B when the pause button is pressed; 6 is a second pivot 6a;
The guide roller 6C is rotated in the counterclockwise direction by the second spring 6b as the center, and the disposed guide roller 6C is brought into circumferential contact with the stepped portion on the lower surface of the loading disk L, and due to the undulation of the stepped portion, the guide roller 6C is rotated counterclockwise by the second spring 6b. A loading position detection lever 7 is a third pivot shaft 7 that rotates to three positions: the tape loading position, the tape loading completed position, and the tape loading completed position.
a, the brake lever is biased counterclockwise by the third spring 7b and presses the disposed brake shoe 70 against the supply reel stand; 8 is the pin (8) on the loading disk that comes into contact with the brake shoe 70 before the tape is loaded; (not shown)
A mounting start detection lever 9 is biased to rotate counterclockwise about a pivot 8a, and a fifth spring 9 is pivoted about a fifth pivot 9a.
An engaging rib 9C that contacts and separates from the first retaining pin 6d on the mounting position detection lever 6 and the second retaining pin 10c (described later) while being rotationally biased counterclockwise by a first release lever 10 that is rotatably guided to two positions by a first connecting pin 9d that is loosely fitted to the rack start detection lever 8, and that rotates the brake lever 7 clockwise by a third locking pin 9e that is planted; is pivotally supported by a sixth pivot 10a and interlocks with the eject lever 4 by a second connecting pin 10b, and engages the second engaging pin 10c, which is erected through the long through hole 4a of the eject lever 4. A single-shaped lever 11 that approaches and separates from the rib 9C is engaged with and guided by a protrusion 12a of a sub-lock plate 12 that slides in the direction of arrow C in conjunction with recording or playback operations, and rotates clockwise about the third pivot 7a. A second release lever 14 rotates in a clockwise direction and rotates the brake lever 7 clockwise about a seventh pivot 14a in conjunction with a fast forward lever 15 and a rewind lever 16 that are slidably locked. The second release lever is rotated by the third connecting shaft 17a of the connecting lever 17, which is rotationally guided in a clockwise direction and is connected to the back tension lever 3 by a third connecting shaft 17a and a fourth connecting shaft 17b. 11 and rotate clockwise, each of which reveals a high-speed transfer lever.

Therefore, according to the mechanism of this embodiment, before the tape is loaded, the loading start detection lever 8, which comes into contact with a pin arranged on the loading disk L, guides the first release lever 9 and guides the brake shoe 7C. The bent piece 6e of the mounting position detection lever 6, which is in a rotational position on the clock side, allows the guide roller 6c to be brought into circumferential contact with a protrusion (not shown) on the lower surface of the loading disc L. The detection pin 3c of the back tension lever 3 is guided into the notch of the cassette.

Therefore, when loading a tape, first load the loading disk L.
The mounting start detection lever 8, which is allowed to rotate clockwise by the pin that moves with the rotation, guides the first release lever 9 counterclockwise by the biasing force of the fifth spring 9b. By doing so, the third engagement pin 9e is used to rotate the brake lever 7 clockwise to release the pressure on the brake shoe 70 and allow the tape to be fed out as the tape is loaded.

On the other hand, the mounting position detection lever 6 is connected to the guide roller 6c.
is removed from the protrusion of the loading disc L, and rotates counterclockwise, the bending piece 6e allows the back tension lever 3 to rotate, and the detection pin 3c is biased by the first spring 3b. It is rotated counterclockwise to pull out the tape inside the cassette.

When the tape is obliquely mounted on the circumferential surface of the guide cylinder as the loading disk L rotates, the guide roller 6c fits into a recess (not shown) on the lower surface of the loading disk and the loading rotation is completed. At the same time, the mounting position detection lever 6 further rotates counterclockwise.

Therefore, the first engagement pin 6d contacts the engagement rib 9c and rotates the first release lever 9 clockwise,
Using the third engagement pin 9e, the brake lever 7 is rotated counterclockwise to press the brake shoe 70 into contact.

Therefore, upon completion of loading, rotation of the supply reel stand 1 is restricted.

When the play button or the record button and the play button are pressed to perform a playback or recording operation with the tape fully loaded, a lock lever (not shown) slid by a play lever interlocked with the play button is moved and the sub-lock lever is moved. 12 is slidably locked in the direction of arrow C.

Therefore, the projection 12a of the sub-lock lever 12 rotates the second release lever 11 clockwise to release the brake shoe 70 from pressure contact.

Therefore, the supply reel stand 1 is allowed to rotate, and the back tension of the tape is controlled by the band brake 13, while the tape is transported at a constant speed.

When the tape is transferred and the pause button is pressed during recording or playback, the pause lever 5 slides in the direction of arrow B and presses the inclined portion 12b of the sub-lock lever 12, which is sliding in the direction of arrow C. Then, only the sub-lock lever is forcibly slid to the illustrated position.

Therefore, the second release lever 11 is rotated counterclockwise to allow the brake shoe 7c to be pressed against the brake shoe 7c and to restrict the transfer of the tape.

On the other hand, if you press the stop button to set the stop state (same as the tape loading complete state) and then press the fast forward button or rewind button, the fast forward lever 15 or rewind lever 16 will slide in the direction of the arrow. The high-speed transfer lever 14
Rotate clockwise.

Therefore, the second release lever 11, which is sandwiched between the high-speed transfer lever 14 and the connection lever 17 and comes into contact with the third connection shaft 17a, is rotated clockwise to press the brake shoe 7C. This allows the supply reel stand 1 to rotate at high speed, and at the same time allows the pack tension lever 3 to be rotated clockwise by the connection lever 17, thereby alleviating sudden changes in the tape path.

Furthermore, when the eject button is pressed in the stopped state, the eject lever 4 slides in the direction of arrow A and is locked, and the L-shaped lever 10 is rotationally guided in the counterclockwise direction to release the second guard. The matching pin 10C is positioned to the right of the long through hole 4a, and the engaging rib 9c and the second engaging pin 10c are connected to each other.
to bring them into contact.

Therefore, even if the guide roller 6C comes out of the recess as the loading disc L is reversed and the mounting position detection lever 6 is rotated clockwise, the second retaining pin 10c will not rotate the first release lever 9. In order to restrict the movement, the rotation of the supply reel stand 1 is restricted during unloading, and the rotation of the take-up reel stand 2 stores the tape in the cassette.

Upon completion of unloading, the pin on the loading L comes into contact with the mounting start detection lever 8, and when the cassette holder is released, the eject lever 4 returns to the illustrated position and engages the second engagement pin 10c and the engagement start detection lever 8. The joint ribs 9c are separated.

However, since the loading start detection lever 8 restricts the rotation of the first release lever 9, the braking of the supply reel stand 1 is maintained.

According to the present invention as described above, since the rotation of the reel stand is restricted before and after the tape is loaded, and the rotation of the reel stand is allowed while the tape is loaded, troubles caused by loosening of the tape can be solved, and the effect is as follows. is large.

Further, since the brake of the reel stand is controlled by the displacement of the mounting position detecting means and the rotating position of the tape tension detecting means is also controlled, the mechanism can be simplified.

[Brief explanation of the drawing]

The figure is a plan view of essential parts showing an embodiment of the present invention. Explanation of main drawing numbers, 8... Installation start detection lever,
6... Mounting position detection lever 7... Brake lever 1... Supply reel stand.

Claims (1)

[Scope of utility model registration request] loading start detection means for detecting the start of loading of the tape loading means and displacing it; loading position detection means for detecting the completion of loading of the tape loading means and displacing it; and applying braking to the reel stand. The brake means is engaged with the mounting start detection means and the mounting position detection means, and is separated from the brake control means for controlling the braking of the brake means by displacement of both means,
The brake control means allows the braking when the tape is not mounted, releases the braking by displacement of the mounting start detection means when tape mounting is started, and displaces the mounting position detection means when tape mounting is completed. A reel braking mechanism that allows the braking by.