JPH034997Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape rewind idler control device for a cassette type tape recorder such as a VTR having means for pulling out a magnetic tape from a cassette and means for storing the tape in the cassette.

Conventionally, in a cassette type tape recorder such as a VTR, a so-called loading means is used to pull out a magnetic tape from a loaded cassette and bring the tape into contact with a magnetic head, and the magnetic tape pulled out by the loading means is placed into the cassette. It was well known to have so-called unloading means for retracting. Here, one of the components constituting the loading means and unloading means
There is an unwinding idler for unloading, but this unwinding idler is not in pressure contact with the supply reel stand during loading or in the loaded state, and the electromagnetic plunger is activated only during unloading operation. The unwinding idler is brought into pressure contact with the supply reel stand, and the supply reel stand is rotated in the tape rewinding direction to take up the slack in the magnetic tape that occurs during the unloading operation. However, as described above, controlling the unwinding idler with an electromagnetic plunger increases the cost, and the operating sound caused by the electromagnetic plunger becomes unpleasant to the ears, which may reduce the commercial value.
Furthermore, since the rewind idler is electrically controlled separately from the loading arm, which serves as a leader that pulls out the magnetic tape from the cassette and brings the tape into contact with the magnetic head, The timing of the rewinding idler control may be shifted. Therefore, if the unwinding idler presses against the supply reel with a large delay in the return of the loading arm, there is a risk that the magnetic tape may temporarily become slack.

The present invention has been developed to eliminate the drawbacks of the conventional devices described above, and is capable of unloading by bumping a reduction gear provided between a loading gear that controls a loading arm and a loading motor. By controlling the unwinding idler for loading, an electric control means dedicated to the rewinding idler such as an electromagnetic plunger can be omitted, and the tape winding in the cassette type tape recorder can be operated one-on-one with the operation of the loading arm. It is an object of the present invention to provide a return idler control device.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an embodiment of the present invention.
1 is a loading motor; 2 is a worm gear that changes the rotation direction of the loading motor 1;
3 and 4 are deceleration gears for decelerating the rotation of the worm gear 2; 5 is a lever that holds the deceleration gears 3 and 4 in an engaged state; It is rotatably provided. Reference numeral 6 designates a loading gear which has a gear surface on its outer periphery that engages with the reduction gear 4 and is rotatable around a shaft 6', and has a cam groove (see FIG. However, a cam groove (not shown) for controlling a rewind idler for unloading, which will be described later, is provided on the back surface. 7
is a fan-shaped gear having a pin 7a that fits into a cam groove provided on the surface of the loading gear 6, and a gear surface at the end, and when the loading gear 6 rotates, the shaft 7' Rotates around. 8,
9 is a loading arm that serves as a leader for pulling out a magnetic tape from a cassette (not shown) and bringing the tape into contact with a magnetic head; 10 is a gear surface that engages with the gear surface of the fan-shaped gear 7; and a gear surface on its outer periphery. When the fan-shaped gear 7 rotates, it rotates about a shaft 10' and controls the operation of the loading arm 8, which will be described later. 11
is a gear having a gear surface that engages with a gear surface provided on the outer periphery of the gear 10, and when the gear 10 rotates, it rotates around the shaft 11' and the loading arm 9 is rotated. Controls the operations described below. Reference numeral 12 denotes a lever rotatably provided on the same axis as the shaft 10', and has a pin 12a at one end that fits into a cam groove provided on the back surface of the loading gear 6, and a lever at the other end. is engaged with a slide lever described later. 13 has a chevron portion 13a,
A slide lever 14 is movable in parallel to the left and right; 14 is an unwinding idler for unloading that is rotatable about a shaft 14'; 15 is a rewind idler for unloading that is rotatable around a shaft 14'; This is an idler lever having a pin 15a that presses against the pin 15a.
16 is a lever rotatable around a shaft 16';
A tension spring 17 is stretched on one end, and the other end is engaged with the idler lever 15 via the pin 15a. Reference numeral 18 denotes a lever for transmitting a backlash, one end of which is engaged with one end of the lever 5 through a pin 18a, and the other end of which is engaged with a lever 19. Reference numeral 19 denotes an L-shaped lever that is rotatable around a shaft 19', and one end has a lever 18 for transmitting backlash as described above.
is engaged, and a pin guide groove 19 is provided at the other end.
It has a. Reference numerals 20 and 21 indicate approximately L-shaped levers having claws 20a and 21a at one end for regulating the position of the shaft 14' and pins 20b and 21b at the other end, and which rotate around a fixed shaft 22. It is set freely. In addition, this lever 20, 21 is shown in FIG.
The relevant parts are shown enlarged. However, in each figure, the same parts are designated by the same reference numerals. Here, the pin 20b fits into the groove 19a,
Although its position is regulated, the pin 21b fits into a hole provided in the fixed substrate (not shown). Further, in FIG. 1, 23 is a supply reel stand, 24 is a take-up reel stand, 25 is a rotating shaft for driving the rewinding idler 14 fixedly provided on a substrate, etc., and 26 is a rotating shaft on which the pin 18a is fitted. The stopper 27 is a tension spring stretched over the lever 19.

The operation of the above embodiment will be explained below. In the device constructed as described above, when the cassette is first mounted in a predetermined position and a knob (not shown) provided on the device is set to PLAY, the loading motor 1 begins to rotate. The rotation direction of the loading motor 1 is changed by the worm gear 2 and transmitted to the reduction gears 3 and 4. Furthermore, the loading gear 6 is rotated clockwise by the rotating shaft of the reduction gear 4, and at the same time, the fan-shaped gear 7 is also rotated clockwise about the shaft 7'. When this fan-shaped gear 7 rotates, the gear 10 that engages with it also rotates counterclockwise, and the loading arm 8 begins to move counterclockwise, and at the same time, the gear 1 that engages with the gear 10 rotates counterclockwise.
1 also rotates clockwise and the loading arm 9
starts moving clockwise and pulls out the magnetic tape stored in the cassette.

Further, at the same time as the loading gear 6 rotates clockwise, the lever 12 that engages with a cam groove provided on the back surface of the loading gear 6 rotates clockwise, and the slide lever 1 that engages with it rotates clockwise.
Move 3 to the left. When the slide lever 13 moves to the left, the pin 15a of the idler lever 15 falls off the chevron portion 13a, and as shown in FIG. A slight gap is maintained between the supply reel stand 23 and the supply reel stand 23, which is regulated by the claws 20a.

Also, at this time, the loading motor 1
The reduction gear 3 is rotated clockwise and the reduction gear 4 is rotated counterclockwise by the rotational force from 3' is applied in a clockwise direction, but the pin 18a is fitted into a stopper 26 such as a hole provided in the fixed base plate shown in FIG. Rotation in direction is restricted. Further, even if the loading motor 1 stops rotating after a predetermined loading is completed, the tension transmission lever 18 is biased to the right by the tension spring 27 stretched around the lever 19. Therefore, the above-mentioned regulatory status is maintained.

Next, when a predetermined loading is performed and recording/reproduction is being performed, when the knob is turned to STOP, the loading motor 1 is reversed. Then, the reduction gear 3 moves counterclockwise,
The reduction gear 4 reverses clockwise, and the lever 5 that holds the reduction gears 3 and 4 in an engaged state rotates counterclockwise around the shaft 3' by the amount of backlash between the reduction gears 3 and 4. As shown in FIG.
At the same time, it is also pressed onto the supply reel stand 23. That is, when the lever 5 rotates counterclockwise, the backlash transmitting lever 18 moves to the left, and the lever 19 also rotates counterclockwise against the spring 27. Furthermore, when the lever 19 rotates counterclockwise, the pin 20b that fits into the groove 19a is pushed upward, and the lever 20 rotates clockwise about the fixed shaft 22, causing the claw 20a to rotate as shown in the figure. As shown, in the open state, the rewinding idler 14, which is already pressed against the rotating shaft 25, is also pressed against the supply reel stand 23. Only in this state is the rotation of the rotary shaft 25 transmitted to the supply reel stand 23 via the rewind idler 14, and the tape is rewinded.

Further, when the backlash between the reduction gears 3 and 4 starts, each member operates as described above, and the rewind idler 14 is controlled to enter the tape rewinding state, but only after the above-mentioned backlash ends, The desired transmission is performed and the loading gear 6 starts rotating counterclockwise. Therefore, after entering the tape rewinding state, the loading gear 6 starts rotating counterclockwise. Simultaneously with the rotation of the loading gear 6, the sector gear 7 rotates counterclockwise around the shaft 7', the gear 10 engaged therewith also rotates clockwise, and the loading arm 8 rotates clockwise. Gear 11 starts moving and engages gear 10 at the same time.
The magnetic tape is also rotated counterclockwise, and the loading arm 9 begins to move counterclockwise, so that the magnetic tape is stored in the cassette.

As mentioned above, the present invention includes the supply reel stand 23,
The rotation is achieved by combining a take-up reel stand 24, a rotating shaft 25 fixed to a substrate or the like, a rotation source such as a loading motor 1, and a plurality of gears such as deceleration gears 3 and 4. A speed reduction device that decelerates the rotation of the source, a loading gear 6 that has a plurality of cam grooves and rotates when the speed reduction device rotates, and a first cam groove of the loading gear 6. A fan-shaped gear 7 that has a pin 7a to be fitted and a gear surface at the end and rotates with the rotation of the loading gear 6, a gear surface that engages with each other, and a gear surface that engages with the sector-shaped gear 7. Two gears 10 and 11 on one side control the operation of the two loading arms 8 and 9.
and a rewind idler 14 that controls rewinding of the tape by pressing against the supply reel stand 23.
In a cassette type tape recorder such as a VTR, which controls the operation of the loading arms 8, 9, etc. by the loading gear 6 to draw out the magnetic tape from the cassette and store the magnetic tape in the cassette. The rewind idler 14
an idler lever 15 that holds the idler lever 15; and an idler lever 14 that regulates the position of the idler lever 15
holding means such as the chevron portion 13a of the slide lever 13 for holding the slide lever 13 in a position where it is not pressed against the supply reel stand 23 and the rotating shaft 25, and a pin that fits into a second cam groove provided in the loading gear. 1
2a at the end thereof and rotates with the rotation of the loading gear 6 to release the above-mentioned holding state and press the rewinding idler 14 only to the rotating shaft 25; , control means such as levers 20, 21 for regulating the left and right movement of the shaft 14' of the rewinding idler 14, and backlash between the gears of the reduction gear when the rotation of the rotation source is reversed. A second release means is provided, which includes a backlash transmission lever 18, a lever 19, etc., which releases the restriction by the restriction means by movement of the speed reduction device, and during loading, the unwinding idler 14 is moved only to the rotating shaft 25. During unloading, the unwinding idler 14 is pressed against the rotary shaft 25 and the supply reel stand 23 to unwind the slack in the magnetic tape caused by the return of the loading arms 8 and 9. In a cassette type tape recorder, an electric control means dedicated to the rewinding idler 14 such as an electromagnetic plunger is omitted, which makes it inexpensive, has low mechanical operation noise, and is mechanically linked to the movement of the loading arms 8 and 9, so malfunctions are rare. A tape rewind idler control device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a tape rewinding idler control device in a cassette tape recorder showing an embodiment of the present invention, FIG. 2 is an enlarged view of essential parts of an embodiment of the present invention, and FIGS. 3 and 4 FIG. 2 is a plan view for explaining the operation of an embodiment of the present invention. 1... Loading motor, 3, 4... Reduction gear, 6... Loading gear, 7... Fan-shaped gear, 7a... Pin, 8, 9... Loading arm, 10, 11... Gear, 12……Lever, 1
2a...Pin, 13...Slide lever, 13a
...Yamagata section, 14...Rewind idler, 14'...
... shaft, 15 ... idler lever, 18 ... lever for clutch transmission, 19 ... lever, 20,
21... Lever, 23... Supply reel stand, 24...
...Take-up reel stand, 25... Rotating shaft.

Claims (1)

[Scope of utility model registration request] A supply reel stand, a take-up reel stand, a rotating shaft fixed to a substrate etc., a rotation source such as a loading motor, and a plurality of gears are combined to reduce the rotation of the rotation source. a loading gear that has a plurality of cam grooves and rotates when the reduction gear rotates, and a pin that fits into a first cam groove of the loading gear and a gear attached to an end thereof. a fan-shaped gear having a surface and rotating with rotation of the loading gear; and a fan-shaped gear having a gear surface that engages with each other and a gear surface that engages with the sector-shaped gear on one side and controls the operation of the two loading arms. and a rewind idler that controls rewinding of the tape by being crimped onto the supply reel base,
In a cassette type tape recorder such as a VTR, which controls the operation of the loading arm, etc. by the loading gear, and pulls out the magnetic tape from the cassette and stores the magnetic tape in the cassette, the rewinding idler is held. an idler lever, a holding means for regulating the position of the idler lever and holding the rewinding idler in a position where it is not pressed against the supply reel stand and the rotating shaft, and a second cam provided on the loading gear. a first releasing means that has a pin at its end that fits into the groove and rotates with the rotation of the loading gear to release the above-described holding state and press the unwinding idler only to the rotating shaft; A regulating means for regulating the horizontal movement of the shaft of the rewinding idler, and movement of the speed reduction device obtained by backlash between each gear of the speed reduction device when the rotation of the rotation source is reversed. A second release means for releasing the restriction by the restriction means is provided, and during loading, the rewinding idler is pressed only to the rotating shaft, and during unloading, the rewinding idler is pressed to the rotating shaft and the supply reel stand. A tape rewind idler control device for a cassette type tape recorder, characterized in that it rewinds slack in a magnetic tape caused by the return of a loading arm.