JPH0330222B2 - - 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, the operation of pressing the pinch roller against the capstan or separating it from the capstan is performed using a drive system, such as a solenoid, that is completely independent of the tape drawing operation, but this has a complicated structure and
Since the pinch roller presses the capstan with impact, the sandwiched magnetic tape may be damaged, and the pressure force of the pinch roller against the capstan may become unstable due to deformation of various parts due to the impact. It had

The present invention solves the problems of such conventional magnetic tape devices, has a simple structure, and selectively performs the magnetic tape drawing operation and the pressing or separating operation of the pinch roller from the capstan using a single motor. In addition, the present invention provides a magnetic tape device in which the pinch roller is driven intermittently to smoothly press the pinch roller against the capstan, thereby obtaining a stable pressing force.

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
is supported, and 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. The cam 52 has two grooves 54 and 56 extending over 360 degrees, as shown in FIGS. 7A and 7B.
The cam is a positive cam with a cam on both sides, and its lift curve is such that the amount of lift changes within a certain rotation angle range, as shown by curves a and b in FIG. Note that 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 non-operating position shown in FIG. 1 to the operating position shown in FIG. 3, or vice versa.
(see figure). That is, when the cam 52 starts rotating counterclockwise from the position shown in FIG.
For the first 50°, the sector gear 64 does not move at all,
From a rotation angle of 50 degrees, the sector gear 64 begins to rotate counterclockwise in FIG. 40 moves in the direction of arrow A in FIG. 1 and pulls the magnetic tape 32 out of the cassette 20. When the rotation angle of the cam 52 reaches 360 degrees, the sector gear 64 rotates at the third rotation angle.
Stop at the position shown in the diagram. Then, as shown in FIG. 2, the pulled-out magnetic tape 68 comes into contact with a drum 70 having a rotating head (not shown) therein and a fixed head 72 for recording/reproducing audio signals.

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. The main rod 82 begins to move to the left in FIG. 2 while being guided by the guide shafts 84, 86 and the guide grooves 88, 90, and when the rotation angle reaches 425 degrees, the main rod 82 moves intermittently to the position shown in FIG. , a recording/reproducing operation completion switch (not shown) is turned on so that power supply to the motor 50 is stopped.

A pinch roller lever 94 is rotatably supported on a shaft 92 installed 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. Further, 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 moves intermittently to the position shown in FIG. When the locking portion 102 of the pinch roller lever 94 is separated, the tension spring 100 is stretched, and the main rod 82 is moved to the position shown in FIG. 4, a predetermined pressing force of the pinch roller 98 against the capstan 74 is obtained. be.

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 118 which is rotationally driven by a capstan motor 78 via a capstan belt 76 and a fast winding belt 116, and one of the two reel stands 16, 18. A fast-winding idler 120 that selectively intervenes and rolls into contact between the two 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 counterclockwise rotation in FIG. 2 due to the tensile force of the tension spring 112 of the idler lever 114 is as follows. Idler lever 1
14 is locked to the protrusion 108 of the main rod 82, it is regulated to the position shown in FIG. , supply reel stand 16 and take-up reel stand 1
A guide (not shown) is provided so that the distance from 8 is approximately the same. As cam 52 rotates clockwise from the position shown in FIG. 2, main rod 82 begins to move to the right in FIG. cam 52
When the main rod rotates to a rotation angle of -25°, the main rod 8
2 moves to the position shown in FIG. 6, and as the protrusion 108 of the main rod 82 moves, the idler lever 114 is rotated counterclockwise in FIG. 120
moves downward in Figure 1, and the quick-winding pulley 118
comes into contact with. At this time, the fast-winding idler 120
is biased toward the left or right in FIG. 1 depending on the rotational direction of the fast-winding pulley 118 by well-known means, and the fast-winding pulley 118 is biased toward either the supply reel stand 16 or the take-up reel stand 18 and the fast-winding pulley 118. The rotating force of the quick-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 pull-out means, but only to the main rod 82, which switches the operation of the device, when the cam rotation angle is between 0° and 25°. 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
When the rotation angle of 2 is 360° or more, the sector gear does not move, and therefore the guide posts 34, 36 and 3
8 and 40 are held in the positions 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 into 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 intermittently in the counterclockwise direction 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.
Power supply to 0 is stopped. pinch roller 98
As shown in FIG. 3, the magnetic tape 68 is pressed against the capstan 74 by the elastic force of a tension spring 100, and in cooperation with the capstan 74, the magnetic tape 68 is transferred at a constant speed to the right in FIG. Wind it up by means of. At this time, the moving speed of the pinch roller 98 is determined by the lift curve b shown in FIG. Since the magnetic tape 68 is not touched and the crimping operation is performed extremely smoothly, the magnetic tape 68 is not damaged. Also, the overrun amount when the motor 50 stops rotating is the main rod 82.
It is clear from the fact that lift curve b in Figure 8 has a flat portion where the lift amount does not change and remains constant at rotation angles of 425° or more. be. Therefore, since the main rod 82 is positioned regardless of the overrun of the motor 50, the amount of extension of the tension spring 100 is always stable, and its elastic force is kept constant, so that the pinch roller 98 is not affected by the capstan 74. The pressure bonding force becomes extremely stable.

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, and 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. 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 along a guide (not shown) to the neutral position shown in FIG. 1, 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, power to the motor 50 is cut off and the motor 50 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 wind pulley 118 to also rotate counterclockwise. The motor 50 rotates counterclockwise in FIG. 2, and the main rod 82 moves to the position shown in FIG.
0 contacts the fast winding pulley 118 and the supply reel stand 16 as shown by the dotted line in FIG. 5, rotates the supply reel stand 16 counterclockwise in FIG. Performs winding and rewinding operations.

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 a magnetic tape between a first position for pulling out the magnetic tape inside the cassette and a second position for pulling out the magnetic tape outside the cassette and attaching it to a drum and a fixed head. a magnetic tape pull-out means that reciprocates, a motor that drives the magnetic tape pull-out means, a pinch roller drive means that presses the pinch roller against or separates it from the capstan by the rotational driving force of the motor, and is driven by the motor; and selective transmission means for selectively and intermittently transmitting continuous rotation of the motor to the magnetic tape pulling means and the pinch roller driving means, the magnetic tape pulling means and the pinch roller driving means selectively and intermittently transmitting the continuous rotation of the motor. Since the driving means is configured to be driven by a single motor, the operation of pressing the pinch roller against the capstan or separating it from the capstan can be performed extremely smoothly and reliably, so that the magnetic tape is not damaged, and the pinch roller can be easily pressed and separated from the capstan. In addition to being able to stably obtain the pressing force of the roller to the capstan, the structure is simple and light in weight.
This makes it possible to realize an inexpensive magnetic tape device.

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 pinch roller driving means, Since the first driving member and the second driving member are selectively and intermittently driven by the rotating member, it is possible to obtain a compact magnetic tape device with a small number of parts. can.

Furthermore, the rotating member has a first cam that drives the first driving member and a second cam that drives the second driving member, and at least one end of the lift curve of the second cam is located at the second cam of the rotating member. Even if the second
Since the lift curve has a flat part as if the second driving member is at rest, and the continuous rotation of the motor is converted into intermittent movement of the second driving member,
If the pinch roller can stably press the capstan against the capstan without being affected by the rotational stop position of the motor, an excellent effect 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)

[Claims] 1. A magnetic tape is pulled out from a cassette containing a pair of reel hubs for winding the magnetic tape, attached to a magnetic head installed outside the cassette, and the magnetic tape is connected to a capstan and a pinch roller. A magnetic tape device that records or reproduces signals by running at a constant speed in cooperation with
a magnetic tape drawer for reciprocating between a first position for drawing out the magnetic tape in the cassette and a second position for drawing the magnetic tape out of the cassette and attaching it to the magnetic head; and the magnetic tape drawer. a motor for driving the means; a pinch roller driving means for pressing the pinch roller against or separating the pinch roller from the capstan by the rotational driving force of the motor; comprising selective transmission means for selectively and intermittently transmitting transmission to the tape drawing means and the pinch roller driving means;
A magnetic tape device, characterized in that the magnetic tape pull-out means and the pinch roller drive means are driven by one motor. 2. The selection transmission means has 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 pinch roller driving means, and The magnetic tape according to claim 1, wherein the first driving member and the second driving member are selectively and intermittently driven by the rotating member. Device. 3 The rotating member is a first rotating member that drives a first driving member.
and a second cam that drives a second driving member, and at least one end of the lift curve of the second cam is such that even when the rotating member rotates, the second driving member stops. The magnetic tape according to claim 2, wherein the lift curve has a flat portion as shown in the figure, and continuous rotation of the motor is converted into intermittent movement of the second driving member. Device.