JPH0471261B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a tape end detection cancel mechanism for preventing a tape end from being detected when the head plate of a tape player having a tape end detection mechanism is retracted.

[Technical background of the invention and its problems] Tape players have various modes such as play, FF/REW, stop, loading/eject, and the position of the head is different for each mode. Therefore, the head is mounted on a head plate that moves back and forth at right angles to the tape running direction, and is moved to the play, FF, or REW position by moving the head plate forward by a driving means.

One type of drive means for the head plate is one that converts the rotational force of a motor into linear motion using a cam that rotates intermittently only when the head plate is driven, thereby pulling the head plate.

With this mechanism, it usually takes 1 to 1.5 seconds for the cam to make one revolution and advance the head plate.
For example, it may take a long time for the head plate to move forward due to the following reasons. That is, when the head plate is moved backward by a stop command, the intermittent gear rotates a little and meshes with the drive gear on the motor side, creating the timing for the next head plate to move forward. If over-rotated, the cam will be out of position and will enter stop mode. Then, even if the next play command is issued, only the cam will rotate and the head plate will not move forward immediately.
Only after the cam has rotated once and reached its normal position will the head plate be moved forward. As a result, it takes about 3 seconds, twice the normal time, to complete the head plate advance after the play command. The motor overspeeds after the stop command, which causes this inconvenience, occurs because a capacitor is inserted in the tape player's circuit, and even after the power is turned off, the motor continues to rotate due to the discharge current of the capacitor. By doing.

On the other hand, one of the tape end detection mechanisms has a fourth
As shown in the figure, there is one that utilizes a check plate 2 that is preliminarily fitted to a support shaft 1 of a rotating reel base. This is because while the reel base is rotating, the check plate 2 is pushed by the frictional force.
While this check plate 2 maintains a certain angle, it detects that the tape is running, and when the frictional force from the reel base is lost and the check plate 2 moves to another angle, the tape This is to determine the end. In addition, check plate 2
In order to detect the angle of
The angle change of the check plate 2 is detected as a change in the amount of swing of the check link 11.

By the way, to detect this kind of tape end,
It takes about 2 seconds. Therefore, as mentioned above, if it takes about 2 seconds for the head plate to move forward from the stop state to the play state, the reel base will not rotate until the head plate has finished moving forward, so it will not be possible to detect the end of the tape. As a result, a channel change operation is required.

[Object of the Invention] The present invention was proposed in order to solve the above-mentioned drawbacks of the prior art, and its purpose is to forcibly rotate the check plate in the rotational direction of the reel base when the head plate retreats. It is an object of the present invention to provide a tape end detection canceling mechanism that prevents tape end detection from being performed until the head plate completes forward movement by moving the head plate.

[Summary of the Invention] The tape end detection cancel mechanism according to the present invention is provided with two cancel links that press the check plate of the tape end detection mechanism toward the forward side or the reverse side, and the change plate includes:
A control part is provided on the head plate to restrict the movement of one of the cancel links according to its rotational position, and to allow the cancel link to press the check plate when the head plate is retracted. When the head plate is retracted, one cancel link is regulated by the regulating part provided on the check plate, but the other cancel link is pressed against the check plate by the control part of the head plate. is forced to rotate. Therefore, the tape end is not detected until the head plate completes its forward movement.

[Embodiment of the Invention] An embodiment of the tape end cancel mechanism according to the present invention as described above will be specifically described with reference to the drawings.

In FIG. 1, a check plate 2 rotatably mounted on a support shaft 1 is frictionally interlocked with a reel base (not shown). This check plate 2 is provided with a Y-shaped groove 3, and a protrusion 4 is formed at the branch portion of the Y-shaped groove 3.

On the other hand, the cam gear 5 for tape end detection rotates around its support shaft 6 in conjunction with the motor, and has an inner cam 7 centered on the shaft 6 and a starting point near the small diameter portion 7a of the inner cam 7 on its surface. Wait for inner cam 7
An island-shaped cam 8 is formed apart from the cam. Support shaft 1
A guide pin 12 that moves on the surface of the cam gear 5 is provided at the tip of the first arm 11a of the check link 11 that rotates around 0. Further, at the tip of the second arm 11b of the check link 11,
A pin 13 is provided to be inserted into the Y-shaped groove 3 of the check plate 2. Furthermore, the third arm 11c
A spring 14 that biases the guide pin 12 toward the support shaft 6 of the cam gear 5 is formed on the fourth arm 11d, and a pressing portion 15 that operates a channel change mechanism (not shown) is formed on the fourth arm 11d.

In addition, in FIG. 2, there are two cancel links 41F and 41R on the forward side and reverse side around the support shaft 40 near the check plate 2.
is provided. Each link 41F, 41R is provided with three arms, and a spring 42 is stretched between the first arms of each to bias each link in opposite directions. 2nd of each link 41F, 41R
The arms extend toward the check plate 2 and serve as pressing parts 43F and 43R for pressing a pressed part 50 provided on the check plate 2. Each link 4
The third arms of 1F and 41R are provided with pin-shaped controlled parts 44F and 44R, and these controlled parts are inserted into the forward side and reverse side regulation parts 61F and 61R formed on the change plate 60. has been done. In this embodiment, the regulating portions 61F, 6
In 1R, the change plate 60 is on the forward side,
This hole has a shape that allows only the cancel links 41F and 41R on the corresponding side to rotate when the reverse side is swung to either side. Further, the controlled parts 44F and 44R of each link are connected to the long holes 31F and 31R provided in the head plate 30.
When the head plate moves forward, the controlled parts 44F and 44R are inserted into the edges of the elongated holes 31F and 31R.
Stepped control portions 32F and 32R are formed to press the spring 42 against the spring 42.

The operation of this embodiment having the above configuration is as follows.

First, in the play state, the tape end detection cam gear 5 rotates counterclockwise in the figure in conjunction with the motor. On the other hand, if the reel base (not shown) is rotating counterclockwise in the figure due to the driving force of the motor, the check plate 2 frictionally interlocked with the reel base will rotate around the spindle 1 in the figure. It rotates counterclockwise, and the Y-shaped groove 3 remains rotated clockwise. In this state, the check link 11 is connected to the spring 1
4 in the counterclockwise direction in the figure around the support shaft 10, and the Y of the check plate 2
Since the Y-shaped groove 3 is held in the right direction, the pin 13 of the second arm 11b of the link 11 is held in the Y-shaped groove 3.
Since the first arm 11a of the link 11 is movable to the tip P1 of the branch part, the first arm 11a of the link 11 is always biased to the left.
As the cam gear 5 rotates, the guide pin 12 moves the inner cam 7 of the cam gear 5. By the way, when the guide pin 12 is at the minimum diameter P1 and maximum diameter P4 of the inner cam 7, the pin 13 of the second arm 11b is at Y
It is located at the tip P1 of the branch part on the groove 3 and the intermediate position P4 of the straight part. That is, the movement range of the check link 11 in the play state is
2 and 13 are limited to the range in which they move within P1 to P4, respectively, the check link 11 does not rotate most clockwise in the figure, and therefore the pressure provided on the fourth arm 11d The channel change mechanism is not actuated through section 15.

When a normal channel change command is issued, the rotation of the reel base is stopped, and the check plate 2 is rotated to a neutral position as shown in FIG. In this state, the protrusion 4 is located on the moving path of the pin 13 of the second arm 11b of the check link 11.
Therefore, the pin 13 is controlled so as to move only in a straight line from the branch point P3, and therefore the guide pin 12 is also controlled to move outward from P3. In this state, when the cam gear 5 further rotates, the guide pin 12 separates from the inner cam 7 at the small diameter portion of the inner cam 7 and rides on the island-shaped cam 8 . and,
When the guide pin 12 reaches the maximum diameter P5 of the island-shaped cam 8, the pin 13 of the second arm 11b moves to the end P5 of the straight part on the Y-shaped groove 3, so that the check link 11 moves as shown in the figure. Because it rotates most clockwise,
The channel change mechanism operates via the pressing portion 15 provided on the fourth arm 11d.

During the play state as described above, the head plate is in the forward position, and the control parts 32F, 32R are connected to the controlled parts 44 of the cancel links 41F, 41R.
Since F and 44R are pressed, the cancel link cannot be rotated by the force of the spring 42, and the pressing parts 43F and 43R do not press the pressed part 50 of the check plate 2, and the check plate 2 is free. The end of the tape can be detected.

When a stop command is input and the head plate 30 retreats, its control section 32 is activated as shown in FIG.
Since F and 32R move backward, cancel link 4
1F and 41R can be rotated by the force of the spring 42. However, change plate 60
Since there are regulating portions 61F and 61R provided on the side, even if the head plate 3 is moved backward, both cancel links will not become free, but on the side where the change plate 60 is rotating (the forward side in Fig. 3). ) only the cancel link 41F is in a free state without being restricted by the restriction section 61F.
As a result, the forward-side cancel link 41F, which is now in a free state, is rotated by the spring 42, and its pressing portion 43F pushes the pressed portion 50 to move the check plate 2 to the forward side (the reel base rotates to the forward side). the direction in which the check plate 2 rotates when the

Note that when the change plate 60 is on the reverse side, the restricting portion 61R allows rotation of the cancel link 41R on the reverse side, so the check plate 2 is rotated in the reverse side by the cancel link 41R. .

In this way, while the head plate 30 is retracting, the check plate 2 rotates to the same position as when the tape is running, depending on the position of the change plate 60 (tape running direction), so even if the reel base is stopped, the tape End detection is canceled. As a result, even if it takes some time for the head plate 30 to complete its advance after the play command is issued, the inconvenience of performing a program change at the end of the tape is eliminated.

In particular, since the holding angle of the check plate is selected depending on the running direction of the tape, malfunctions are eliminated. In other words, if one cancel link holds the check plate on only one side (forward side) regardless of the tape running direction, in reverse mode, after the head plate moves forward, the check plate that is separated from the cancel link will move toward the reel. It will move to the opposite side (reverse side) due to the rotational force of the base, and in that case, the pin of the check link will hit the protrusion in the center of the Y-shaped groove, and there is a possibility that it will be detected as the tape end. There is no unnecessary movement of the check plate, and no malfunctions occur.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and for example, the configuration of the shape of the cancel link, the restricting part of the check plate, the control part of the head plate, etc. can be selected as appropriate.

[Effects of the Invention] As explained above, according to the tape end detection cancel mechanism of the present invention, two cancel links are provided for pressing the check plate toward the forward side or the reverse side. When retracting, the check plate is held by the cancel link at the same angle as when rotating the reel base, so no channel change operation is performed when transitioning from the stop state to the play state.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a tape end detection mechanism used in an embodiment of the tape end detection cancel mechanism according to the present invention, and FIGS. 2 and 3 show an embodiment of the tape end detection cancel mechanism according to the present invention. FIG. 2 is a plan view showing an example of a neutral position when a channel change command is issued, FIG. 3 is a retracted position of the head plate, and FIG. 4 is a plan view showing an example of a conventional tape end detection mechanism. 1... Support shaft, 2... Check plate, 3... Y-shaped groove, 5... Cam gear, 6... Support shaft, 7... Inner cam, 8
...Island cam, 10... Support shaft, 11... Check link, 12... Guide pin, 13... Pin, 14... Spring, 15... Pressing part, 30... Head plate,
31F, 31R... Long hole, 32F, 32R... Control part, 40... Support shaft, 41F, 41R... Cancel link, 42... Spring, 43F, 43R... Pressing part, 44F, 44R... Controlled part, 50... Pressed part , 60...Change plate, 61F, 61R...
Regulatory Department.

Claims (1)

[Claims] 1. A reel base whose forward side forks are rotated to the reverse side by a tape running motor; and a reel base that is frictionally interlocked with the reel base so that the stopped position of the reel base and the forward side forks are rotated to the reverse side. In a tape player equipped with a check plate that moves between the rotating position and a tape end detection mechanism that detects rotation stoppage of the reel base based on the movement position of the check plate, a. Two cancel links that push the check plate to the forward and reverse sides. b Change plate that moves to the forward side and reverse side according to the running direction of the tape. c. A regulating part provided on the check plate and regulating the movement of one of the two cancel links according to its movement position. d. A control portion formed in the head plate to allow the cancel link to press against the check plate when the head plate is retracted. A tape end detection cancel mechanism characterized by comprising each of the members a to d above.