JPH0325857B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for pulling out a magnetic tape from a cassette containing a pair of reel hubs for winding the magnetic tape outside the cassette, and running the magnetic tape along a magnetic head such as a rotating magnetic head installed outside the cassette. The present invention relates to a magnetic tape device for recording or reproducing signals, or storing and reproducing (hereinafter referred to as recording/reproducing) signals.

Generally, in a magnetic tape device such as a cassette-type video tape recorder, a magnetic tape is pulled out from a cassette and run along a rotating magnetic head or a fixed magnetic head for audio. If you do it with
Since a plunger and a complicated clutch mechanism are required to switch and transmit the motor driving force to the magnetic tape drawer and the tape drive, many devices are equipped with a motor exclusively for magnetic tape drawer. Therefore, switching the operation mode of the device is performed using a drive system that is completely independent of the tape drawer operation, such as a solenoid, which has a complex structure and requires the magnetic tape drawer to be driven by the motor drive force. Since switching from the drive section to the tape drive section is performed with an impact, problems such as damage to the magnetic tape arise.

In view of the problems of the conventional magnetic tape apparatus, the present invention provides a first position for pulling out the magnetic tape in the cassette and a second position for pulling out the magnetic tape outside the cassette and attaching it to the magnetic head. a magnetic tape pull-out means that moves back and forth between the magnetic tape pull-out means, a motor that drives the magnetic tape pull-out means, a pair of reel stands that engage with the pair of reel hubs, and a drive wheel that rotationally drives the pair of reel stands. , an operating position in which one of the pair of reel stands and the drive wheel are in rolling contact to transmit the rotational force of the drive wheel to the reel stand, and the pair of reel stands; a rotating body that reciprocates between a non-operating position in which it does not contact the drive wheel; a rotating body moving means for moving the rotary body between the positions; and a selective transmission means driven by the motor and selectively transmitting the power of the motor to the magnetic tape drawing means and the rotary body moving means; By providing this, it is possible to drive the magnetic tape pull-out means and the rotary body moving means with one motor with an extremely simple structure, and the rotary body can be moved by the motor, so a solenoid is used. The present invention provides an extremely reliable magnetic tape device in which no impact force is applied to the rotating body, the reel stand, and the magnetic tape as in the case of the present invention.

Hereinafter, the present invention will be explained based on illustrated embodiments. In each figure, a supply reel stand 16 and a take-up reel stand 18, which are each rotatably supported by shafts 12 and 14 implanted on the upper surface of a substrate 10, move a cassette 20 to a predetermined location on the main body of the apparatus. When installed in the supply reel hub 22 in the cassette 20,
They are adapted to be engaged with the take-up reel hub 24 and rotate integrally with each other. The magnetic tape 26 wound on the supply reel hub 22 is guided so as to cover the front surfaces of a pair of notches 28 and 30 provided at the front of the cassette 20, and is taken up on the take-up reel hub 24. Inside the pair of notches 28 and 30,
guide posts 34, 36 and 38 for pulling out and guiding two magnetic tapes 32;
40 are arranged. On the other hand, a motor 50 connects a belt 44 to a shaft 42 installed on the back side of the substrate 10.
and a gear 48 rotated via a pulley 46
Further, near the cam 52, a cam 52 meshed with a gear portion 48 formed on the outer periphery is rotatably supported on a shaft 58 implanted on the back surface of the base plate 10. As clearly shown in FIGS. 7A and 7B of the cam 52,
It is a positive cam with two grooves 54 and 56 extending over 360° on both sides, and its lift curve changes within a certain rotation angle range, as shown by curves a and b in Figure 8. It is set as. In addition,
In FIG. 8, a indicates a lift curve of the groove portion 54, and b indicates a lift curve of the groove portion 56.

A first cam follower, which will be described later, is fitted into one groove 54 of the cam 52, and the first cam follower moves only when the rotation angle of the cam 52 is between 50° and 360°, as shown by curve a in FIG. It is designed to do so. A shaft 60 is disposed on the back side of the base plate 10 and includes a sector gear 6 having a first cam follower 62 that fits into one groove 54 of the cam 52.
4 is rotatably supported, and the teeth 66 of the sector gear 64 are connected to the guide posts 34, 36, 38, 4.
0 from the inoperative position shown in FIG. 1 to the operative position shown in FIG. 3, or vice versa. There is. That is, the cam 52
When starts rotating counterclockwise from the position shown in FIG. 2, the sector gear 64 does not move at all for the first 50 degrees, but from the rotation angle of 50 degrees, the sector gear 64 rotates counterclockwise around the axis 60 in FIG. direction, thus rotating the gear 65 of the magnetic tape withdrawing means, the guide posts 34, 36 and 38, 40 move in the direction of arrow A in FIG.
is pulled out of the cassette 20. When the rotation angle of the cam 52 reaches 360 degrees, the sector gear 64 stops rotating at the position shown in FIG. Then, the pulled-out magnetic tape 68 comes to be attached to a drum 70 having a rotating head (not shown) therein and a fixed head 72 for recording/reproducing audio signals, as shown in the second figure.

On the other hand, when the rotation angle of the cam 52 is from 0° to -25°, the lift amount of the groove portion 54 does not change as is clear from the curve a in FIG.
4 did not move, and the guide posts 34, 36 and 3
8 and 40 are stopped at the positions shown in FIG.

A capstan 74 rotatably disposed on the substrate 10 is rotated via a capstan belt 76 by a capstan motor 78 capable of forward and reverse rotation.

The main rod 82 has a second cam follower 80 that fits into the other groove 56 of the cam 52.
It is guided by guide shafts 84, 86 and guide grooves 88, 90 formed in the main rod 82, so that it can freely reciprocate linearly. The other groove portion 56 of the cam 52 also extends over 360° and is a positive cam. As shown by b in FIG. 8, the lift curve is such that the second cam follower 80 moves only in the section where the lift amount changes. That is, when the cam 52 starts to rotate counterclockwise from the position shown in FIG. 2, the main rod 82 does not move at all for the first 20 degrees, as is clear from the curve b in FIG. 82 is guided by the guide shafts 84, 86 and guide grooves 88, 90 and begins to move to the left in FIG. 2 until the rotation angle is 425°.
At this point, the main rod 82 moves to the position shown in FIG. 3, and a recording/reproducing operation completion switch (not shown) is turned on to stop power supply to the motor 50.

A pinch roller lever 94 is rotatably supported on a shaft 92 implanted on the upper surface of the substrate 10.
A pinch roller 98 is rotatably supported on a shaft 96 implanted at one end of the pinch roller lever 94. A tension spring 100 is hung between the other end of the pinch roller lever 94 and the main rod 82. Furthermore, the locking portion 102 provided on the pinch roller lever 94 and the tip of the adjustment screw 104 held on the main rod 82 are arranged to form a contact/separation relationship. Therefore, when the cam 52 starts rotating counterclockwise in FIG. 2, the main rod does not move at all for the first 20 degrees, so the pinch roller lever 94 and the pinch roller 98 also stop at the position shown in FIG. There is. When the rotation angle reaches 20 degrees, the main rod 82 moves to the left in FIG. 2, that is, to the right in FIG.
It begins to rotate counterclockwise as shown in the figure. Main rod 8
2 reaches the position shown in FIG. 4, the pinch roller 98 comes into contact with the capstan 74, and the anticlockwise rotation of the pinch roller lever 94 in FIG. The locking portions 102 of 94 are separated, and the tension spring 1
00 is stretched and the main rod 82 moves to the position shown in FIG. 4, a predetermined pressing force of the pinch roller 98 against the capstan 74 is obtained.

In FIG. 3, the pulled-out magnetic tape 68 is transferred to the right in FIG. 3 by the cooperation of the capstan 74 and the pinch roller 98, and is wound onto the take-up reel hub 24 by known means. It is set as.

114 is a shaft 106 implanted on the back surface of the substrate 10
The idler lever is rotatably supported on the main rod 82, and has a pin 110 that engages and disengages with the protrusion 108 of the main rod 82, and is rotated counterclockwise in FIG. 2 by a tension spring 112. Forced. Further, one end of a support plate 124 is rotatably supported on a shaft 115 installed at one end of the idler lever 114, and the support plate 124
Near the other end of 4, there is a fast-winding pulley 1 which is rotationally driven by a capstan motor 78 via a capstan belt 76 and a fast-winding belt 116.
A fast-winding idler 120 that selectively intervenes and rolls between the reel stand 18 and one of the two reel stands 16, 18 is rotatably supported by a support shaft 122. When the rotation angle of the cam 52 is between 0° and 425°,
As shown in FIGS. 2 and 4, the rotation of the idler lever 114 in the counterclockwise direction in FIG.
Since the pin 110 for folding the reel is locked to the protrusion 108 of the main rod 82, it is restricted to the position shown in FIG. A guide (not shown) is provided so that the distances from the supply reel stand 16 and the take-up reel stand 18 are approximately equal. As cam 52 rotates clockwise from the position shown in FIG. 2, main rod 82 begins to move to the right in FIG. When the cam 52 rotates to a rotation angle of -25°, the main rod 82 moves to the position shown in FIG. 6, and as the protrusion 108 of the main rod 82 moves, the idler lever 1
14 is rotated counterclockwise in FIG. 2 by the biasing force of the tension spring 112, and the idler 120 is
It moves downward in the figure and comes into contact with the quick winding pulley 118. At this time, the fast winding idler 120 is biased toward the left or right in FIG.
, and the fast winding pulley 118, so that the rotational force of the fast winding pulley is transmitted to the reel stand.

As mentioned above, the clutch mechanism is used which does not transmit the driving force of the motor 50 to the magnetic tape pulling means when the cam rotation angle is from 0° to 25°, but only to the main rod 82 that switches the operation of the device. Because of the structure, operation switching can be performed with a simple structure.

Next, the operation will be explained.

When the record/playback switch (not shown) is pressed from the stopped state shown in FIG. 1, the capstan motor 78 rotates counterclockwise in FIG. 2, and the capstan motor 74 rotates clockwise in FIG. Rotate it. Also, in FIG. 2, the motor 50 begins to rotate clockwise. The rotation of the motor 50 is transmitted to the cam 52 via the belt 44 and the gear 48, but as is clear from the curve a in FIG. 8, the sector gear 64 does not start moving immediately even when the motor 50 starts rotating.
When the rotation angle of the cam 52 exceeds 50 degrees, the first cam follower 62 fitted in one groove 54 of the cam 52 moves to the left in FIG. 2, the guide posts 34, 36 and 3 rotate counterclockwise to rotate the gear 65 of the magnetic tape pull-out means.
8 and 40 move in the direction of arrow A in FIG. 1 to pull out the magnetic tape 32 outside the cassette 20. cam 5
When the rotation angle of 2 becomes 360°, the guide post 34,
36, 38, and 40 are moved to the positions shown in FIG. As is clear from curve a in Fig. 8, cam 5
If the rotation angle of 2 is more than 360°, the sector gear will not move.
Therefore, the guide posts 34, 36 and 38,
40 is held in the position shown in FIG.

On the other hand, when the recording/playback switch is pressed from the stopped state shown in FIG. 1, the motor 50 begins to rotate counterclockwise in FIG. 2 as described above. Although this rotation is transmitted to the cam 52, the main rod 82 does not start moving immediately, as is clear from curve b in FIG. Pinch roller 98 therefore remains in the position shown in FIG. When the rotation angle of the cam 52 exceeds 20 degrees, the second cam follower 80 fitted in the other groove 56 of the cam 52 moves to the left in FIG. 86 and moves to the left in FIG. As a result, the pinch roller lever 94 begins to rotate counterclockwise in FIG. 1, and the pinch roller 98 comes into contact with the capstan 74. Then, when the cam 52 continues to rotate and the rotation angle reaches 425 degrees, the main rod 82 moves to the position shown in FIG. will be stopped. The pinch roller 98 has a tension spring 100 attached to the capstan 74 as shown in FIG.
The magnetic tape 68 is pressed by the elastic force of the capstan 74, and the magnetic tape 68 is moved at a constant speed to the right in FIG.

In this manner, the magnetic tape 68 runs alongside the drum 70 and the fixed head 72, and signals are recorded/reproduced.

When a stop switch (not shown) is pressed, power to the capstan motor 78 is cut off and the capstan 74 is stopped. At the same time, the motor 50 is energized, and the motor 50 rotates counterclockwise in FIG.
8 returns to the position shown in FIG. At this time, the magnetic tape 68 that has been pulled out is stored in the cassette 20 by well-known means. and,
When a stop position detection switch (not shown) is turned on, the motor 50 stops rotating and returns to the stopped state. During the above operation, the fast-winding idler 120
is the pin 1 installed in the idler lever 114.
10 is locked by the protrusion 108 of the main rod 82, so that it is spaced apart from the supply reel stand 16, take-up reel stand 18, and fast winding pulley 118.

Next, press the fast forward switch (not shown).
Capstan motor 78 rotates counterclockwise in FIG. 2, and quick pulley 118 rotates clockwise in FIG. Motor 50 rotates counterclockwise in FIG. 2, cam 52 rotates clockwise in FIG. 2, main rod 82 moves rightward in FIG. 2, and idler lever 114 rotates counterclockwise in FIG. Rotate to. When the cam 52 rotates to a rotation angle of -25°, the main rod 82 moves to the position shown in FIG. 6, a quick winding operation completion switch (not shown) is turned on, and the power supply to the motor 50 is cut off. The fast-winding idler 120 abuts the fast-winding pulley 118, but in this case, since the fast-winding pulley 118 is rotating clockwise in FIG. 1, the fast-winding idler 120 is rotated to the right in FIG. 5, the winding pulley 118 and the take-up reel stand 18 come into contact with each other, as shown by solid lines in FIG. At this time, the rotation of the motor 50 is transmitted at a sufficiently reduced speed relative to the movement of the main rod 82, so that the main rod 82 does not move impulsively. That is, idler lever 1
14 rotates smoothly in conjunction with the movement of the main rod 82, so that the fast winding idler 120 rolls into contact with the fast winding pulley 118 and the take-up reel stand 18, causing abnormal tension to be applied to the magnetic tape 68. , by sagging magnetic tape 6
There is no fear of damaging 8. Also,
By controlling the rotation speed of the motor 50, the moving speed of the fast-winding idler 120 can be set to an optimum speed. Since the take-up reel stand 18 is rotated clockwise in FIG. 5, the magnetic tape 26 wound around the supply reel hub 22 is wound onto the take-up reel hub, thereby performing a fast forwarding operation. In this case, the pinch roller 98 rotates to the position shown in FIG. When a stop switch (not shown) is pressed, power to the capstan motor 78 is cut off, the capstan 74 stops rotating, and therefore the fast winding pulley 118 also stops rotating. At the same time, the motor 50 is energized and rotates clockwise as shown in FIG.
20 returns to the neutral position shown in FIG. 1 along a guide (not shown), and the main rod 82 and pinch roller 98 also return to the positions shown in FIG. When a stop position detection switch (not shown) is turned on, the motor 50 is de-energized and returns to the stopped state.

During the above operation, the guide posts 34, 36 and 38, 40 are stopped at the positions shown in FIG. 1, and the main rod 82 is moved between the stop position and the fast winding position without driving the magnetic tape pull-out means. I am moving it back and forth.

Pressing the rewind switch (not shown) causes the capstan motor 78 to rotate counterclockwise in FIG. 1, causing the fast winding pulley 118 to also rotate counterclockwise. The motor 50 rotates counterclockwise in FIG.
The main rod 82 moves in the same way as during fast forwarding and moves to the 6th rod.
The fast-winding idler 120 is moved to the position shown in the figure, and the fast-winding idler 120 is connected to the quick-winding pulley 11 as shown by the dotted line in FIG.
8 and the supply reel stand 16, the supply reel stand 16 is rotated counterclockwise in FIG. 5, the magnetic tape 26 is wound onto the supply reel hub 22, and a rewinding operation is performed. At this time, similarly to the case of fast forwarding operation, the fast winding idler 120 is brought into contact with an impact,
No damage is caused to the magnetic tape 68 or the like.

When the stop switch (not shown) is pressed, the fast wind idler 118, main rod 82 and pinch roller 98 return to the positions shown in FIG. Then, it becomes stopped.

As described above, the rotation angle of the cam across the stop position is in the positive direction toward the recording/playback position, and
If the rotation angle is configured to be driven in the negative direction toward the fast-winding position, the transition from the recording/reproducing mode to the fast-winding mode can be performed very smoothly.

As is clear from the above description, the present invention provides reciprocating movement between a first position for pulling out the magnetic tape in the cassette and a second position for pulling out the magnetic tape outside the cassette and attaching it to the magnetic head. a motor for driving the magnetic tape withdrawing means; a pair of reel stands that engage with the pair of reel hubs; a drive wheel that rotationally drives the pair of reel stands; and a drive wheel that rotationally drives the pair of reel stands. an operating position in which one of the reel stands and the driving wheel is in rolling contact and the rotational force of the driving wheel can be transmitted to the reel stand, and the pair of reel stands and the driving wheel are in rolling contact; a rotating body that reciprocates between the non-operating position; and a rotary body that rotatably supports the rotating body, and receives power from the motor to move the rotating body between the operating position and the non-operating position. and a selection means that is driven by the motor and selectively transmits the power of the motor to the magnetic tape pull-out means and the rotary body moving means. Therefore, a special effect can be obtained in that a highly reliable magnetic tape device can be realized in which the rolling and contacting operation of the rotating body can be performed extremely smoothly and reliably, and there is no risk of damaging the magnetic tape or the like.

Further, the selection transmission means has a rotating member driven by a motor, a first driving member that drives the magnetic tape drawing means, and a second driving member that drives the rotating body moving means, Since the first driving member and the second driving member are selectively driven by the rotating member, there is also the effect that a compact magnetic tape device with fewer parts can be obtained.

[Brief explanation of drawings]

1 and 2 are a top view and a back view of essential parts in a stop state of a magnetic tape device according to an embodiment of the present invention, and FIGS. 3 and 4 are main parts in a recording/reproducing mode of the same embodiment. Top view and back view of main parts,
Figures 5 and 6 are a top view and a back view of the main parts of the same embodiment in the fast winding mode, Figures 7A and B are top and back views of the cam in the same embodiment, and Figure 8 is the same. It is a lift curve diagram of a cam. 16... Supply reel stand, 18... Take-up reel stand, 32, 69... Magnetic tape, 34, 36, 3
8, 40...Guide post, 50...Motor, 5
2...Cam, 54, 56...Groove, 62...First
Cam follower, 64... sector gear, 65... gear, 70... drum, 72... fixed head, 74
... Capstan, 78 ... Capstan motor, 80 ... Second cam follower, 82 ... Main rod, 98 ... Pinch roller, 118 ...
Quick-winding pulley, 120... Quick-winding idler.

Claims (1)

[Scope of Claims] 1. A magnetic tape is pulled out from a cassette containing a pair of reel hubs for winding the magnetic tape, and is run along a magnetic head installed outside the cassette to record or reproduce signals. The magnetic tape device is a magnetic tape device that moves back and forth between a first position for pulling out the magnetic tape in the cassette and a second position for pulling out the magnetic tape outside the cassette and adhering it to the magnetic head. A tape pull-out means, a motor that drives the magnetic tape pull-out means, a pair of reel stands that engage with the pair of reel hubs, a drive wheel that rotationally drives the pair of reel stands, and one of the pair of reel stands. an operating position in which one of the reel stands and the driving wheel is in rolling contact to transmit the rotational force of the driving wheel to the reel stand; a rotating body that reciprocates between operating positions; and a rotation that rotatably supports the rotating body and moves the rotating body between the operating position and the non-operating position by receiving power from the motor. A magnetic tape device comprising body moving means, and selective transmission means driven by the motor and selectively transmitting the power of the motor to the magnetic tape drawing means and the rotary body moving means. . 2. The selection transmission means includes a rotating member driven by a motor, a first driving member that drives the magnetic tape pull-out means, and a second driving member that drives the rotating body moving means.
and a driving member, wherein the first driving member and the second driving member are selectively driven by the rotating member. The magnetic tape device described.