JPH0452824Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a tape slack prevention device for a cassette-type tape player. In particular, when a cassette pack is attached to a tape player, the head and pinch rollers are pressed against each other. Before entering the play state,
This relates to a device for taking up slack in tape in a cassette pack.

[Technical background of the invention] Generally, in a cassette-type tape player, the head is moved back from the normal playback state so that the head and pinch rollers do not get in the way when ejecting the cassette pack (hereinafter referred to as the pack). In addition, the pinch roller is separated from the capstan shaft so that the tape is not pinched. Therefore, when the pack is attached to a tape player, the reel base for taking up the tape starts rotating as soon as the power is turned on, the pinch roller presses against the capstan shaft to feed the tape, and the head moves forward. and press it onto the surface of the tape and begin to pick up the recording signal. In this case, since each of these operations is essential for the playing state of the tape player, they are started almost simultaneously, even if there is a slight time difference.

[Problems with the background art] By the way, in such a tape player,
If the tape in the inserted pack is loose, the following problems may occur.

Before the loose tape is wound onto the reel base on the take-up side, it is drawn along the surface of the capstan shaft and pinch roller, causing winding. In particular, since the pinch rollers are made of a material such as rubber to prevent slipping, they tend to pull in loose tape, which tends to cause malfunctions such as stopping the player or cutting the tape due to the wrapping of the tape.

If the tape is loose, it will escape even when the head is moved forward, and the two parts will not be crimped together with the appropriate pressure, resulting in unstable audio output and a long wait until the slack is removed and proper playback is achieved. , so-called start-up becomes difficult.

In this way, if the tape inside the pack is loose,
To avoid this, we have shifted the timing of the crimping of the head and the start of rotation of the reel base, which used to be carried out almost at the same time, to first drive the reel base to take up the slack in the tape, and then press the tape at a constant rate. It is also conceivable that the head and pinch roller be crimped with a time lag of .

However, if the reel base is rotated in advance, the tape will advance before the head is completely crimped, resulting in a problem where the beginning of the tape will be cut off after the original playback start position. Although this phenomenon of head cutting is unavoidable when there is slack in the tape, in conventional equipment, even when the tape is wound normally with no slack, or even when there is little slack in the tape, the reel base If there is always a time lag between the start of rotation of the tape and the completion of crimping of the head, this type of tape slack prevention device cannot be used in tape players that require proper recording and playback. Ta.

Therefore, when taking up slack in the tape, the reel base on the supply side is locked with a stopper, and when the head is in contact with the tape that has completed its advance, the stopper is released to allow the reel base on the supply side to rotate. There have also been proposals to do so. In this case, the stopper was mechanically released in conjunction with the forward movement of the head, but in the conventional design, the head and stopper were directly linked, so when the head was moved forward, the stopper was released immediately. When the tape is released, the supply reel base rotates until the head completes forward movement, causing the tape to run even if there is no slack.

[Purpose of the invention] The present invention was proposed in view of the problems of the prior art as described above.The purpose of the invention is that, although the stopper is linked with the moving head, the stopper is linked to the moving head. The stopper prevents the rotation of the supply reel base from being stopped, and as a result, unnecessary tape winding is avoided by winding up the slack in the tape before the head is crimped. To provide a tape slack prevention device which eliminates the breakage of the top of a normal tape with no slack and reduces the breakage of the top of the tape as much as possible even if the tape has slack.

[Summary of the invention] The tape slack prevention device of the present invention is provided with a brake mechanism linked to the head on the reel base on the tape supply side, and only the reel base on the tape winding side is stopped when the power is turned on and the motor starts driving. The tape is rotated to take up the slack in the tape inside the pack, and then the brake mechanism is released in conjunction with the pressure-bonding action of the tape as the head moves forward, allowing the supply side reel base to rotate and allowing the tape to travel. It is.

Particularly, the present invention includes a stopper which is movably attached to the head and moves forward together with the head as a brake mechanism, and a stopper which rotates together with the tape supply reel base and which is connected to the stopper while the head moves from the retracted position to the forward position. Since the stopper is provided with a claw portion that engages with the stopper at a constant engagement width, and an elastic means that biases the stopper toward the claw portion,
Even if the head moves forward, the engagement between the stopper and the claw portion does not come off immediately, and the tape supply side reel base can be kept stopped.

[Embodiment of the invention] Hereinafter, an embodiment of the invention will be specifically described based on the drawings.

A Configuration In the figure, 1 is the reel base on the tape winding side, 2 is the reel base on the tape supply side, and the reel base 1 on the winding side is linked to the drive motor, and when the motor is powered on, The supply reel base 2 starts rotating in the winding direction, while the supply reel base 2 is driven by the tape being wound up by the take-up reel base 1 and rotates drivenly. In addition, these reel bases 1 and 2
is a so-called friction pulley that frictionally engages with its support shaft, and if the motor torque is directly applied to the tape or the supply reel base 2 over-rotates, the tape may become slack. It seems like there is no one.

Reference numeral 3 denotes a head, and the head 3 is provided on a head plate 4 which is movably provided on the board of the tape player in a direction perpendicular to the running direction of the tape. Various types of driving means for the head plate 4 are known, such as a spring or a cam that utilizes the insertion force of the pack. The head plate 4 is advanced by transmitting the driving force of the motor to the head plate using a cam or a lock gear, and a clutch mechanism so that the head plate 4 advances toward the tape. That is, when the head plate 4 is moved forward by the driving force of the motor, it takes a time equivalent to the movement stroke of the head plate 4 from the start of rotation of the motor to the completion of crimping the head 3 and the tape. ,
This is because there is a time lag between the start of the operation of the take-up reel base 1, which rotates simultaneously with the start of driving the motor. Of course, the head plate 4 is moved forward by turning on the motor when the pack is inserted into the entrance of the tape player, and then using cams, springs, or other mechanical means after the pack is inserted sufficiently deep. It is also possible to have it performed.

The brake mechanism of the supply reel base 2 is connected to the head plate 4, which moves forward with a certain time lag after the start of rotation of the take-up reel base 1.

This brake mechanism first starts with the head plate 4.
The slide plate 5 is provided with a slide plate 5 extending from the reel base 2 to the supply side reel base 2 side. The slide plate 5 engages with the head plate 4 at a locking piece 6 provided at its base end. This slide plate 5 is
It is disposed so as to be movable back and forth toward the supply side reel base 2 side in conjunction with the head plate 4, and for this purpose, the guide pin 7 provided on the board side of the tape player is inserted into the guide hole 8 on the slide plate 5 side. is slidably inserted into the

The tip of the slide plate 5 is connected to the supply side reel base 2
It is branched into two arms so as to surround the support shaft, and a rotation link 9 is attached to one of the branched arms so as to be rotatable about the support shaft 10. This rotation link 9 has arms extending in three directions around the pivot point to the support shaft 10, and a pin 12 is provided at the tip of the arm 9a that extends toward the head plate 4 side. This pin 12 is inserted into a rotation angle regulating hole 13 bored in the slide plate 5. The other arm 9b is extended so as to surround the support shaft of the tape supply reel base 2 from the side opposite to the slide plate 5, and there is a rotating section between its tip and the slide plate 5. A spring 14 is tensioned to pull the dynamic link 9 toward the support shaft of the tape supply reel base 2. Note that this spring 14 corresponds to the elastic means mentioned in the claims of the present invention. Furthermore,
This arm 9b is provided with a claw-shaped stopper 15 that protrudes toward the support shaft side of the tape supply side reel base 2.

On the other hand, the tape supply side reel base 2 is integrally provided with a claw portion 16 that engages with the stopper 15 on the rotating link 9 side with a constant engagement width so as to rotate together with the reel base 2.

B. Effect The tape slack prevention device of this embodiment has the above-mentioned mechanism, and its effect will be explained next.

(Before crimping the head plate...Fig. 1) When the pack is in the ejected state, the head 3
together with the head plate 4 is located at a position set back from the tape surface. Therefore, the slide plate 5 connected to the head plate 4 has also retreated in the direction A in the figure, and the rotation link 9 at the tip of the slide plate 5 is drawn toward the tape supply side reel base 2, and the rotation link 9 A stopper 15 engages with the claw portion 16. Therefore, the tape supply reel base 2 is locked so that it cannot rotate in the tape supply direction.

Note that since the rotary link 9 is biased counterclockwise (in the direction of arrow B) by a spring 14 provided at its tip, the stopper 15 and the claw portion 16 are reliably engaged.

When a pack is inserted into the tape player in this state, the power is first turned on and the motor starts rotating. Then, the tape winding side reel base 1 which is interlocked with the motor starts rotating. When the pack inserted into the tape player is loaded into the playback position of the tape player and the reel shaft is inserted into the reel hole of the pack, the reel base on the tape winding side is already rotating, so the inside of the pack The take-up reel receives rotational force. However, in this state, the tape supply side reel base 2 is
The supply reel in the pack will not rotate because it is locked by the reel. Therefore, if there is any slack in the tape in the pack, the tape is wound up to account for the slack, and then the tape remains at that position. Of course, a normal tape with no slack will not be wound up at all after inserting the pack.

(When crimping the head plate...Fig. 2) Now, after the take-up reel base 1 starts rotating,
When the head 3 and the head plate 4 move forward with a certain time lag, the slide plate 5 is pushed by the head plate 4 and moves forward in the direction C in the figure. Then, the rotation link 9 provided at the tip of the slide plate 5
continues to move in the direction of separation from the supply side reel base 2, and the stopper 15 of the rotation link 9 and the claw portion 16 are disengaged from each other. As a result, the supply side reel base 2 can be rotated, and the tape in the pack is pulled out from the supply side reel by the capstan shaft and the pinch roller that pinches the tape at the same time as the head is crimped. is wound onto a take-up reel driven by.

Here, the engagement between the stopper 15 and the claw part 16 needs to be released when the head is crimped, but in this embodiment, the stopper 15 is disengaged from the spring 16.
Even if the slide plate 5 moves and separates from the tape supply side reel base 2, the rotation link 4 is initially
is indexed by the spring 14 and moves toward the claw portion 16, and the engagement between the stopper 15 and the claw portion 16 is ensured until the slide plate 5 has moved sufficiently and the crimping of the head is completed.

In this case, if the amount of engagement between the stopper 15 and the claw portion 16 is made large enough to match the movement width of the slide plate 5, the stopper 5 can be provided directly on the slide plate 5 without providing the rotation link 9.

[Other Examples] Note that this example is not limited to the illustrated example, and the following embodiments can also be adopted.

A stopper is provided directly on the slide plate 5.

Instead of the slide plate 5, a link is connected to the head plate 4 and swings toward the side surface of the tape supply side reel base as the head plate 4 moves back and forth, and a stopper is provided at the tip of this link.

A rotary link 9 with a stopper is provided on the head plate 4 without using the slide plate 5, or a stopper is provided directly on the head plate 4.

[Effects of the invention] As mentioned above, the tape slack prevention device of the invention has the following advantages:
Since the tape supply reel base is locked before the head is crimped onto the tape, no further tape winding can be performed after the tape has been loosened or if there is no slack in the tape. Because the tape is not pushed forward, the tape may advance further than it did when the pack was inserted. This has the effect of eliminating the inconvenience of clipping the beginning during playback.

In addition, similar to the conventional slack prevention device, it has a sufficient effect of preventing the tape from wrapping around the capstan shaft or pinch roller. The head is crimped onto the tape while a certain tension is applied to the tape by the reel base, so the tape and head are properly crimped, resulting in an excellent start-up of the playback output. There is also.

In particular, in this invention, the stopper that engages with the pawl provided on the supply reel base with a constant engagement width is moved together with the head, so even when the head is moving forward, the stopper on the supply side reel base can be mechanically locked. It can be stopped with a simple structure.

[Brief explanation of the drawing]

The drawings show an embodiment of the tape slack prevention device of the present invention, in which FIG. 1 is a plan view before the head is crimped, and FIG. 2 is a plan view after the head is crimped. 1...Tape winding side reel base, 2...Tape supply side reel base, 3...Head, 4...
Head plate, 5... Slide plate, 6... Locking piece, 7... Guide pin, 8... Guide hole, 9...
Rotating link, 9a, 9b... Arm of rotating link, 1
0...Spindle, 12...Pin, 13...Angle regulating hole, 14...Spring, 15...Stopper, 1
6...Claw part.

Claims (1)

[Claims for Utility Model Registration] (1) A tape winding reel base that starts rotating when a cassette pack is inserted into a tape player, and a tape that has a certain time lag after the tape winding reel base starts rotating. The reel base on the tape supply side is provided with a brake mechanism that releases the lock when the head is crimped onto the tape, and this brake mechanism is movably attached to the head. a stopper that moves forward together with the head; a claw that rotates together with the tape supply reel base and engages with the stopper at a constant engagement width while the head moves from the retracted position to the forward position; 1. A tape loosening prevention device characterized by comprising an elastic means for biasing the tape toward the tape side. (2) The elastic means is constituted by a spring, the stopper is provided integrally with a rotating link that moves together with the head, and the rotating link is moved by the spring in a direction to engage the stopper with the pawl. The tape loosening prevention device according to claim 1 of the utility model registration claim, wherein the tape slack prevention device is biased.