JPS6019062B2 - 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 push-down operation. Therefore, in view of the above-mentioned points, the present invention specifically proposes a tape running system of a cassette video tape recorder having a tape mounting mechanism so as to be electrically operable. It is.

The present invention will be described below according to an illustrated embodiment.

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a cassette indicated by a dashed line, 3 is a take-up reel stand, 4 is a supply reel stand, and 6 is a cassette indicated by a dashed line. A first idler that drives the take-up reel table 3 in rotation; T is a second idler that transmits the rotation of the first idler 6 at the winding time to the V supply reel;
8 supports the first idler 6 and a relay pulley 9 that transmits rotation to the first idler 6, and a first spring coil 10.
A first idler lever, 11', is biased to rotate clockwise and rotated counterclockwise during tape racking and tape winding, and transmits the rotation of the intermediate pulley 9 to the first idler 6. a first belt 12 for transmitting the rotation of the reel drive motor 13 to the intermediate pulley 9;
A belt 14 is a second idler lever that supports the second idler 7, and a belt 15 has one end pivoted to the second idler lever 14 as shown in FIG. A first lever 16 is a second spring coil that pulls the second idler lever 14, and a second spring coil 17 is pivotally supported on a second shaft 18, and is rotated clockwise by a third spring coil 19, thereby pulling the second idler lever 14. 1, which urges the shield pin 5 on the lever 15 upward.
A lever 20 is a first solenoid that pulls and drives the first link 21 during tape twilling and tape winding, 22 is a third shaft that pivots the first idler lever 8 on the first link 21, and 23 is a tape A supply reel brake lever 25 is rotated counterclockwise by a fourth coil spring 24 to brake the combined reel stand 4 when the tape is stopped, and a supply reel brake lever 25 is rotated clockwise by a fifth spring coil 26 when the tape is stopped. The take-up reel brake lever 1, 27 which is biased and brakes the take-up reel stand 3 is provided with a brake leaf spring 28 which applies a constant tension to the supply reel stand 4 during loading, and has one end attached to a first slide 29 which will be described later. A third lever 29 is fitted with a loose iron and whose end is pivotally supported on the second slide 32, and the third lever 29 has one end supported on the fourth shaft 30 together with the third lever 28, and the other end supported on the fourth shaft 30 together with the winding wheel brake lever 25. 5 a first slide supported by the shaft 31;
32 is a second slide which is pulled and biased to the right in the figure by the sixth spring coil 33 and moved to the left in the figure during tape winding and tape fast forwarding; 34 is a fourth lever driven by the second solenoid 36; A second link 37 that pulls the second slide 32 via a link 35 is biased to rotate counterclockwise by a seventh spring coil 38, and when it comes into contact with the back tension detection pin 39 and the supply reel stand 4, the brake band is closed. 40 is a back tension lever; 41 is a loading disk that stacks a leading guide 42, a first tape guide 43, a second tape guide 44, and a third tape guide 45, and supports a pinch roller 46 in a swingable manner; 47 is a capstan that rotates integrally with the flywheel 48; 49 is a capstan motor 5;
51 is a pinch roller pressure saddle lever that presses the pinch roller 46 against the capstan 47 at the tape loading position; 52 is a third belt that transmits the traction force of the third solenoid 57 to the flywheel 48; 5 links 54
The third link 53 transmits the force that the fifth link 54 applies to the third link 52 to the fifth lever 5.
5 and a fourth link 58 which is buffered by a sixth coil spring 56 is biased in a counterclockwise direction by a sixth spring coil 59, and when the tape loading is completed, it is rotated in a counterclockwise direction to apply the back tension. Loading cam levers 1 and 61, which allow rotation of the lever 37 in the counterclockwise direction and close the microswitch 60 for detecting completion of tape loading, are urged in the direction of the rebound indicator by the sixth coil spring 62. It is rotated clockwise with the rotation of the pinch roller pressure lever 51, and engages with the gutter vertical shaft of the third lever 27 that swings against the second slide 32, thereby causing the third lever 27 to rotate clockwise.
A fifth lever 63 releases the supply reel brake lever 23 and the take-up reel brake lever 25 by rotating the lever 27 counterclockwise;
guide cylinder fixed on 4, 65, 66, 67,
68 is a fixed guide pin that defines the running path of the tape; 69
Reference numeral 70 indicates a fixed head for erasing, and 70 indicates a fixed head for recording and reproducing audio control signals. As shown in FIG. 1, when the tape is stopped, the first idler 6 is rolled onto the take-up reel stand 29, and the supply reel stand 4
The supply reel brake lever 23 and the supply reel brake lever 25 are respectively press-fitted to the winding reel stand 3 to restrict the rotation of both reel stands 3 and 4. When the cassette is mounted in this state, a microswitch (not shown) closes, energizing the first solenoid 20 and the capstan motor 50.

Therefore, while the capstan motor 5 drives the loading disk 41 counterclockwise via a loading disk drive mechanism (not shown) that is in contact with the flywheel 48, the first solenoid 20
Rotate the first idler lever 8 counterclockwise, and use the first idler lever 8 to release the brake lever 23.
is released to allow the tape to be pulled out as the loading disc 41 rotates, while the brake leaf spring 28 is released.
The tape is loaded by pulling out the tape without slack due to the back tension provided by the tape. (See Figure 2) After that, when the loading disc 41 reaches the tape loading end point, the loading cam lever 58 causes the roller to enter the opening (not shown) of the loading disc 41 and rotate in the direction of the rebound indicator. Then, the microswitch 60 is closed and the back tension lever 37 is allowed to rotate counterclockwise, while the loading mechanism is separated from the flywheel 48.

Therefore, the microswitch 60, which is turned on, deenergizes the capstan motor and the first solenoid 20, thereby stopping the rotation of the loading disc 41, causing the first idler 6 to disengage, and causing the supply reel brake lever 23 to stop rotating.
The back tension lever 3 rotates while compressing the
7 completes the tape guide path and comes to a halt. (See FIG. 3) When the record switch or playback switch (not shown) is further closed in this state, the third solenoid 57
Then, the capstan motor 50 and the reel drive motor 13 are energized.

Therefore, the third solenoid/id 57 is connected to the pinch roller 46.
is pressed against the capstan 47, and the fifth
The lever 61 is rotated clockwise, and only the third lever 27 is rotated counterclockwise without sliding the second slide 32 to close the supply V supply reel brake lever 23 and the take-up 1 reel. The press release of the brake lever 25 is released, and the tape led out from the supply side with a constant tension is moved to the above-mentioned key. It is caused to travel at a constant speed by rotating the upstan 47, and is wound onto the take-up reel. (See FIG. 4) Next, when the fast-forward switch (not shown) is closed in the stopped state shown in FIG. is energized.

Therefore, the second solenoid 36 is connected to the second slide 3.
2 to the left in the figure, and rotate the third lever 27 counterclockwise to release the supply reel brake 23 and the take-up reel brake 25, and at the same time, move the back tension lever 37 slightly clockwise. The reel drive motor 13 is rotated in the direction shown in FIG. When the rewind switch (not shown) is closed, the first solenoid 20 and the reel drive motor 13 are first energized, and then the second solenoid 36 is energized.

Therefore, first, by energizing the first solenoid 20, the first eye. The roller 6 is moved away from the take-up reel stand 3 and closer to the supply reel stand 4, and the supply reel brake lever 23 is also released from its braking state. Next, the second slide 32, which is slid by the biasing force of the second solenoid 36, moves the second idler 7 between the winding roll table 4 and the second idler 7 in conjunction with the rotation of the second lever 17. 1 by elastically rolling the idler 6, rotating the back tension lever 37 slightly counterclockwise, and releasing the braking of the winding wheel brake lever 31. The rotation of the reel drive motor 13 is transmitted to the supply reel stand to perform high-speed rewinding of the tape. (See FIG. 6) Therefore, according to this embodiment, the first idler 6 and the second idler 7 are moved during winding to bring the winding roll table 4 and both idlers into a rolling state. In this case, the first idler 6 is moved first, and then the second idler 7 is transferred to the first idler 6 and the winding roll table 4, so the second idler 7 is moved first. Compared to the case where the first idler 6 moves the second idler 7 simultaneously, 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 tape is loaded by applying braking to only one reel stand without particularly changing the usual reel stand brake release mechanism that releases the brakes on both reel stands when the tape runs. The first step is to move the idler to release the brake, which is unique to cassette video tape recorders.
Since it is configured to be performed in conjunction with the operation of the solenoid, it is possible to avoid an increase in the number of parts and a complication of the mechanism due to an increase in functions, which is highly effective.

[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 winding state, and FIG. 7 is a plan view of the main mechanism. Explanation of main drawing numbers, 36... Second solenoid (brake release solenoid), 32... Second slide (slide), 27... Third lever (rotating lever)
, 23... Supply reel brake lever, 25...
・Take-up wheel brake lever, 57...Third solenoid (pinch roller support solenoid), 51...
...Pinch roller pressure saddle lever, 61...5th lever (relay lever), 20...1st solenoid (idler movement solenoid), 8...1st idler lever ( idler lever). Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

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 rotating lever 27 that rotates to the second position, and a pair of supply side and take-up side brake levers 23 that release the brakes on the supply reel stand and the take-up reel stand as the rotary lever rotates to the second position. , 25, a pinch roller pressure solenoid 57 that is only energized during playback and recording, and a second
a pinch roller pressing lever 51 that presses the pinch roller moved to the capstan, and a relay lever 61 that rotates the rotary lever to the second position in conjunction with the movement of the pinch roller pressing lever to the second position. , an idler moving solenoid 20 that is energized during rewinding and loading, and the energization of the solenoid moves the idler that contacts the take-up reel stand toward the supply reel, and the brake lever on the supply reel side is in a brake-released state. A reel stand brake release mechanism characterized by being provided with an idler lever 8.