JPS6019059B2 - Tape travel control mechanism - Google Patents

Description

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

Magnetic recording/reproduction pseudolayers in tape recorders and the like 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 tape running control mechanism configured to electrically operate the tape running system of a cassette type video tape recorder having a tape bag storage mechanism.

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

FIG. 1 shows an embodiment of the present invention. In the figure, number 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 7 drives the reel table 3 in a rolling manner, and a second idler 8 transmits the rotation of the first idler 6 to the supply reel.
supports the first idler 6 and an intermediate pulley 9 that transmits rotation to the first idler 6, and has a first spring coil 10.
A first idler lever 11 is biased to rotate in the clockwise direction and rotated counterclockwise during tape racking and tape rewinding; 12 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; 15 is also shown in FIG. A first lever whose one end is pivotally supported by the second idler lever 14 and whose other end is suspended by a second slide 32 to be described later, 16 a second spring coil for pulling the second idler lever 14, and 17 a second shaft. 20 is a first link 21; 22 is a third shaft that pivots the first idler lever 8 on the first link 21; 23 is a fourth spring coil 24 when the tape is stopped; A supply reel brake lever 25 is rotated counterclockwise to brake the uneven feed reel table 4, and a supply reel brake lever 25 is biased to rotate clockwise by a spring coil 26 for stopping the tape. A take-up reel brake lever 27 brakes the supply reel base 3, and a brake plate spring 28 is arranged to apply a constant tension to the supply reel base 4 during loading.
A third lever 29 has both ends supported by a first slide 29 and a second slide 32 (to be described later), and the third lever 29 has one end supported by a fourth shaft 3 along with the third lever 27, as described above, and is used for winding. A first slide whose Ikebata is supported by a fifth shaft 31 together with a brake lever 25;
This is a second slide that is pulled and biased to the right in the figure by a spring coil 33 and moved to the left in the figure during tape loading and tape fast forwarding.As shown in FIG. A notch 32a is provided, and this notch 32
There is a first lever 15 and a shield pin 5 at a position opposite to a.
In addition, 34 in FIG. 1 is a second link that pulls the second slide 32 via a fourth lever 35 when driven by a second solenoid 36, and 37 is biased to rotate counterclockwise by a seventh spring coil 38. This is back tension detection pin 3
9 and a brake band 40 circumferentially surrounding the supply reel stand 4.
A back tension lever 41, which is arranged with
47, a cab stan that rotates integrally with the flywheel 48; 49, which controls the rotation of the capstan motor 50; 51 is a pinch roller pressing lever that presses the pinch roller 46 against the capstan 47 at the tape loading position; 52 is a pinch roller pressure contact lever that transmits the pulling force of the third solenoid 57 via the fifth link 54; 53 is a fourth link that buffers the force applied by the fifth link 54 to the third link 52 by a fifth lever 55 and an eighth spring coil 56; The back tension lever 37 is urged to rotate in the clockwise direction and rotates counterclockwise upon completion of tape loading to allow the back tension lever 37 to rotate counterclockwise. A roving cam lever 61 that closes the switch 60 is biased counterclockwise by a tenth spring coil 62 and rotated clockwise as the pinch loaf pressure contact bar 51 rotates, and the second slide 32 3rd lever 2 to play
7 to rotate the third lever 27 counterclockwise, the first slide 29 slides to the right in the figure, and the second slide 32 slides to the left in the figure. the supply reel brake lever 23.
and a sixth lever for releasing the winding wheel brake lever 25.
Lever, 63 is a guide cylinder fixed on the support base 64, 65, 66, 67, 68 are fixed guide pins that define the running path of the tape, 69 is a fixed head for erasing, 70 is for recording and reproducing audio control signals. A fixed head is shown in each case. Note that 8', 17', and 27' are the rotational center axes of the first idler lever 8, the second lever 17, and the third lever 27, respectively. Further, details will be explained with reference to FIG.

The idler 7 is pivotally supported by a second idler lever 14. This second idler lever 14 has a shaft 14a.
Accordingly, it is rotatably supported on the first lever 15.
The pin 15a provided on the first lever 15 is fitted into the long hole 32h of the second slide 32, and
The shield pin 5 is held in contact with one end of the second lever 17 at a position facing the notch 32a of the second slide 32. Therefore, the first solenoid 20 is energized, the second lever 17 is rotated counterclockwise, and the shield pin 5 is rotated counterclockwise.
When separated from the first lever 15, the first lever 15 moves downward in the figure due to the bias of the second spring coil 16, and the shield pin 5 moves into the notch 32a (see FIG. 8).

In this state, the first lever 15 has only moved to the left in the drawing, and therefore the second idler 7 has moved only slightly, so that it is separated from the supply reel stand 4.

By the way, when the second solenoid 36 is energized and the second slide 32 moves to the left with the shield pin 5 inserted into the notch 32a, the first lever 1
5 also moves to the left, so that the second idler 7 comes into contact with the supply reel stand 4.

Note that the sixth spring coil 33 is a biasing means that biases the second slide 32 to the right in the figure. This second slide 32 allows the shield pin 5 to fit into the notch 32a, and this notch 32a restricts the movement of the first lever 15 to the left in the figure, so that the second idler 7 can be moved to the supply reel stand 4. prevents contact with. As shown in FIG. 1, when the tape is stopped, the first idler 6 is rolled onto the winding reel stand 3, and the supply reel brake lever 23 is moved onto the supply IJ-roll stand 4, and the winding reel The winding reel brake lever 25 is mounted on the reel stand 3. Both reel stands 3 and 4 are rotated after being compressed. is regulated.

When the cassette is installed in this state, a microswitch (not shown) closes, energizing the first solenoid 20 and the capstan motor 50.

Therefore, the capstan motor 50 drives the loading disc 41 counterclockwise via a loading disc drive mechanism (not shown) that is in rolling contact with the flywheel 48, while driving the first solenoid 20.
The first idler lever 8 is rotated counterclockwise so that the first idler lever 8 is connected to the brake lever 2.
3. is released to allow the tape to be pulled out as the loading disk 41 rotates, and the tape is pulled out without slack by the back tension provided by the brake original plate spring 28 to perform tape loading. (See FIG. 2) After that, when the loading disk 41 reaches the end point of loading the tape, the loading cam lever 58 moves the loading cam lever 58 counterclockwise so that the loading disk 41 enters the notch (not shown) in the loading disk 41. Then, the micro switch 60
While allowing the back tension lever 37 to rotate counterclockwise, the loading mechanism is separated from the flywheel 48.

Therefore, the microswitch 60 that closes deenergizes the capstan motor 50 and the first solenoid 20 to stop the rotation of the loading disc 41, stop the rotation of the first idler 6, and stop the rotation of the supply reel brake lever 23. The back tension lever 37, which performs pressure saddle and rotates, completes the tape guide path and comes to a stopped state. (See FIG. 3) In this state, when a recording switch or a reproducing switch (not shown) is further closed, the third solenoid 57, the capstan motor 50, and the IJ roll drive motor 3 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 sixth
Rotate the lever 61 clockwise. Then, one end of the sixth lever 61 supports the shaft 27a and rotates the third lever 27 in a counterclockwise direction so that the supply reel brake lever 23 and the take-up reel brake lever 2
5 is released, and the tape drawn out from the mating side with a constant tension is caused to run at a constant speed by the rotation of the capstan 47, and is wound onto the take-up reel (see FIG. 4). At this time, the second slide 32 slides to the left in the drawing due to the clockwise rotation of the sixth lever 61, but the bucket stand pin 5 is supported in contact with one end of the second lever 17. Therefore, do not move. For this reason, the first lever 1
5 does not move, and the second idler 7 also does not move. Next, when the fast forward switch (not shown) is closed in the stopped state shown in FIG. 3, in which the recording or reproducing operation is ended by closing the stop switch, the second solenoid 36 and the reel drive motor 13 are energized.

Therefore, the second solenoid 36 is connected to the second slide 32.
to the left in the figure, rotate the third lever 27 counterclockwise to release the pressure saddles of the supply reel brake 23 and the take-up reel brake 25, and rotate the back tension lever 37 slightly clockwise. The reel drive motor 13, which is energized with a high voltage, feeds the tape at high speed.
(See Figure 3) On the other hand, when the rewind switch (not shown) is closed in the stopped state of Figure 3, first the first solenoid 20
Then, the reel drive motor 13 is energized, and then the second solenoid 36 is energized. Therefore, first, the first idler 6 is moved away from the take-up reel stand 3 by the biasing of the first solenoid 20 and is moved away from the supply reel stand 4.
the supply reel brake lever 23
The braking state is also released. Further, the second lever 17 rotates counterclockwise and separates from the pin 5. Therefore, the standing pin 5 moves downward in the figure due to the biasing force of the second spring coil 16, and moves into the notch (32a) of the second slide 32.
(See Figure 8). Next, the second solenoid 36
Due to the bias of the second slide 32, the second ring 34
It slides to the left in the figure via the lever 35. Therefore, the first lever 15, which is also biased to the left in the figure by the second spring coil 16, moves to the left in the figure together with the second slide 32. Therefore, the second idler 7 is moved to the left in the figure and also slightly downward in the figure to elastically transfer the second idler 7 to the supply reel stand 4 and the first idler 6. At the same time, the back tension lever 37 is rotated slightly clockwise, and the braking of the take-up reel brake lever 31 is released, thereby causing the rotation of the reel drive motor 3 energized with a high voltage to be controlled by the supply reel stand. 4 to perform high-speed rewinding of the tape. (See FIG. 6) Therefore, according to this embodiment, when the first idler 6 and the second idler 7 are moved during winding to bring the supply reel stand 4 and both idlers into the rolling state, Since the configuration is such that the first idler 6 is moved first and then the second idler 7 is transferred to the first idler 6 and the supply reel stand 4, the second idler 7 is moved first or moved simultaneously. Compared to the case where the first idler 6 moves the second idler 7 backward, the load on the first solenoid 20 that moves the first idler 6 is reduced.

Therefore, according to the present invention, the load on the solenoid can be reduced simply by adjusting the operation timing of the solenoid, 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. FIG. 5 is a plan view of the fast-forwarding state, FIG. 6 is a plan view of the winding state, and FIGS. 7, 8, and 8 are plan views of the main mechanisms. Explanation of main drawing numbers, 3... Take-up reel stand (first reel stand), 4... Supply reel stand (second reel stand),
6...First idler, 7...Second idler, 20...First solenoid, 38...Sixth spring coil (biasing means) 36...Second solenoid. Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. A first reel stand for rotationally driving the first reel stand in a first direction.
an idler, a second idler that transmits the rotation of the first idler to the second reel stand so as to rotate the second reel stand in a second direction, and the first idler that is in rolling contact with the first reel stand. A first solenoid that is held in a non-contact manner against bias, and a second idler that is held in a non-contact manner with respect to the second reel stand and the first idler is elastically attached to the second reel stand and the first idler. and a second solenoid brought into contact with the second solenoid, and the operation of the second solenoid is delayed from the operation of the first solenoid when driving the second reel stand.