JPH0229543Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pinch roller drive device for a tape deck.

Some conventional tape decks include those in which a head and a pinch roller are attached to a head base, and those in which a pinch roller is provided separately from the head base so that the pinch roller moves as the head base moves. However, these things are
In either case, the head base moves in parallel in a direction perpendicular to the running direction of the tape, so the amount of movement of the pinch roller cannot be made that large relative to the amount of movement of the head. Normally, it is necessary to press the pinch roller against the capstan with a constant force, so the amount of movement of the pinch roller needs to be sufficiently larger than the amount of movement of the head. Therefore, conventionally, considering the amount of movement of the pinch roller,
The head base was being moved more than the required amount of head movement.

Furthermore, when the head base moves in parallel in a direction orthogonal to the tape running direction, the sliding point of the head base and the point of application of the force applied to the head base are not on the same straight line in the moving direction of the head base. In a structure in which several guide pins are provided protruding along the direction of movement of the head base, and a long hole is formed in the head base that slides using the guide pin as a guide, the point of force application is located on a straight line in the direction of the long hole. As a result, when the head base is moved, a rotational moment is generated in the head base, resulting in a problem in that it is strained between the head base and the guide pin.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pinch roller drive device for a tape deck that can increase the amount of movement of the pinch roller relative to the amount of movement of the head, and at the same time can smoothly operate the head base.

Therefore, in the present invention, the base end of the head base is rotatably supported on one side of the reel stand of the base plate, so that the head base can be freely rotated about the base end, and the head is attached to the middle part of the head base. A pinch roller arm is rotatably supported at the tip thereof, a pinch roller is rotatably provided at one end of the pinch roller arm, and the pinch roller arm is rotated in a direction in which the pinch roller moves away from the capstan. Further, when the head base is rotated in a direction in which the head comes into contact with the tape during a playback operation, the other end of the pinch roller arm is abutted and locked, and the spring is applied to the head base. A stopper mechanism is provided to rotate the pinch roller arm in a direction in which the pinch roller contacts the capstan against the urging force of the pinch roller arm, thereby making the amount of displacement of the pinch roller arm larger than the amount of movement of the head due to rotation of the head base. Furthermore, the above object is achieved by increasing the amount of movement of the pinch roller by rotating the pinch roller arm.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of this embodiment in an assembled state, FIGS. 2 to 4 are sectional views of various parts, and FIG. 5 is an exploded perspective view. In these figures, a base plate 1 has a motor 2 and two holding pieces 3A and 3B at the rear, and a pair of reels on both sides of the center, one of which is selectively rotated by the drive of the motor 2. The bases 4A and 4B have a pair of guide pins 5A and 5B at the front and a capstan 6 which is rotated counterclockwise in FIG. 1 by the drive of the motor 2.
are provided for each. At a position above the pair of reel stands 4A, 4B, a cassette holder 8 whose rear ends are rotatably supported by the holding pieces 3A, 3B via pins 7 is provided so as to be freely raised and lowered.

The cassette holder 8 is formed into a flat box shape with an open top and front surface, and is stretched between the other side 9A of the rear end of the cassette 9 and an adjustment screw mounting member 11 fixed to the base plate 1. It is constantly urged upward by a spring 12.
Further, a stopper piece (not shown) is provided on one side of the lower surface of the cassette holder 8 for regulating the upright angle of the cassette holder 8 to a predetermined angle, and an opening 3 formed in the base plate 1 is provided on the other side of the lower surface. An engaging piece 14 is provided that extends through the base plate 1 and projects toward the lower surface side of the base plate 1. An engaging cam portion 15 is formed at the lower part of the engaging piece 14 and projects forward. The engagement cam portion 15 has an upper edge 15A parallel to the lower surface of the cassette holder 8.
The front edge 15B is formed into an arcuate surface centered on the pivot point of the cassette holder 8, that is, the pin 7.

Further, on the upper surface of the base plate 1,
At its front edge is a head base 22 whose proximal end is rotatably supported via a support shaft 21, and at one side edge is a head base 22.
A release lever 24 is provided on the other side of the base plate 1 and is slidable in the front and rear directions of the base plate 1 via a book guide shaft 23, and a set lever 26 is provided on the other side that is slidable in the front and back directions of the base plate 1 via two guide shafts 25. In addition, on the lower surface of the base plate 1, a center portion of an L-shaped play lever 27 is rotatably provided on one side of the base plate 1 via a support post 28.

The head base 22 has a tip side edge 22A that is a pivot point for the head base 22, that is, a support shaft 21.
An annular groove 3 of a guide member 29 formed in an arcuate shape centered on the base plate 1 and protruding from the base plate 1.
0, and the front edge 22B of the distal end portion is formed in an arcuate shape centered on the rotation fulcrum of the play lever 27, that is, the support 28. Further, on the upper surface of the head base 22, a long hole 31 and a roller 32 are provided closer to the base end than the support shaft 21.
However, a head 33 is provided at the center, and a stopper pin 34 and a support shaft 35 are provided at the tip. The roller 32 includes an eject lever mechanism 3.
6 is coming. Eject lever mechanism 3
6, an upwardly U-shaped holding frame 37 is fixed to the front edge of one side of the base plate 1, and this holding frame 37
A downward U-shaped eject lever 3 between both side plates of
8 is rotatably provided via a shaft 39,
A shaft 41 of a roller 40 that presses the roller 32 toward the rear of the base plate 1 is mounted between both side plates of the eject lever 38. A spring 43 is stretched between the shaft 41 and the cut and raised piece 42 of the holding frame 37. Therefore, the spring 43 forces the front end of the ejector lever 38 to rotate upward about the shaft 39, that is, the roller 40 is urged away from the roller 32 of the head base 22. . Further, a central portion of a pinch roller arm 44 is rotatably supported by a shaft portion 35A of the support shaft 35 that projects upward from the head base 22. The pinch roller arm 44 contacts the stopper pin 34 while being biased to rotate counterclockwise in FIG. A pinch roller 46 for separating is provided, and a rising wall 44A at the other end faces a stopper mechanism 47.

The stopper mechanism 47 has an upward U-shaped holding frame 48 on the other side of the base plate 1, which is attached to the screw 4.
9, the rear plate 48 of this holding frame 48
An adjustment screw 51 having a guide hole 50 on the front end surface is screwed into A, and a stopper pin 52 whose rear end is inserted into the guide hole 50 of the front plate 48B and whose front end projects toward the front side of the front plate 48B. is inserted through the base plate 1 so as to be freely forward and backward in the front-rear direction, and a spring 53 is wound between the adjustment screw 51 and a flange 52A of the stopper pin 52 formed on the rear side of the front plate 48B. The stopper pin 52 is connected to the pinch roller arm 44 when the head base 22 is rotated to the state shown in FIG.
It hits the rising wall 44A and restricts its movement.
Therefore, the other end of the pinch roller arm 44 is locked, and when the head base 22 is further rotated counterclockwise from this state, the pinch roller arm 44 is locked.
Rotate clockwise. Furthermore, when the compression force of the spring 53 is changed by rotating the adjustment screw 51, the force that urges the stopper pin 52 forward is changed, and thereby the pinch roller arm 44
The rotating force of the pinch roller 46, that is, the pressing force of the pinch roller 46 against the capstan 6 is changed.

Further, the release lever 24 is provided with an engaging protrusion 61 that engages with the elongated hole 31 of the head base 22 at the front end, a pressing pin 62 at the rear end, and a raised piece 63 at one side edge. There is. A spring 65 that biases the release lever 24 toward the rear of the base plate 1 is stretched between the cut and raised piece 63 and the cut and raised piece 64 cut and raised on the base plate 1 . Further, a recording prevention mechanism 66 is made to face the operating pin 62. Recording prevention mechanism 66
A rotary tube 67 is rotatably fitted into a column 60 protruding from one side of the base plate 1, and a spring (not shown) is attached to the lower part of the rotary tube 67 in a clockwise direction in FIG. A rotating arm 68 is fixed, which is biased to rotate and whose substantially center portion is pressed rearward by the pressing pin 62, and a detector 69 is provided at the tip of the rotating arm 68. The lower end 69A of the detector 69 faces a switch (not shown) provided on the lower surface of the base plate 1 through an opening 70 formed in the base plate 1, and the detection protrusion 69B at the upper end is attached to the cassette holder 8. The recording prevention claw of the cassette case was exposed. Therefore, when a cassette case with the recording prevention claw removed is attached to the cassette holder 8,
The detection protrusion 69B of the detector 69 is inserted into the hole in which the recording prevention claw has been removed, and at the same time a switch is activated by the lower end 69A of the detector 69, thereby preventing recording.

The set lever 26 also has a shaft portion 35B at its front end that protrudes toward the lower surface of the head base 22.
A rectangular engagement hole 71 that freely engages with the cassette holder 8, a roller 72 that comes into sliding contact with the engagement cam portion 15 of the cassette holder 8 at the rear end, and a raised piece 73 on the other side edge. There is. A spring 75 is tensioned between the lower part of the cut-and-raised piece 73 and the cut-and-raised piece 74 formed on the base plate 1, and biases the set lever 26 toward the rear of the base plate 1. Here, a rotational moment due to the rearward biasing force of the set lever 26 and a rotational moment due to the rearward biasing force of the release lever 24 act on the head base 22. The tensile forces of the springs 65, 75 are selected so that the rotational moment is large. As a result, the head base 22 is maintained in a state where it is urged to rotate counterclockwise in FIG. Further, an adjustment screw 76 that comes into contact with the upper part of the cut and raised piece 73 is screwed into the adjustment screw attachment member 11 . The adjustment screw 76 has an elastic member 77 at its tip that comes into contact with the upper part of the cut and raised piece 73 and cushions the impact.
However, there is a spring 7 around it that absorbs the play of the adjustment screw 76.
8 are provided respectively. Therefore, when the set lever 26 is moved rearward by the spring 75, the cut-out piece 73 engages the elastic member 77 of the adjustment screw 76.
At this time, the stop position of the set lever 26 is regulated, and as a result, the rotation angle of the head base 22 is regulated. Here, the rotation angle of the head base 22 is adjusted by the adjustment screw 76 so that the head 33 of the head base 22 is in light contact with the tape of the cassette case.

A plunger 83 of a solenoid 82 is connected to one end of the play lever 27 via a connecting pin 81, and a plunger 83 of a solenoid 82 is connected to the other end of the play lever 27 through a long hole 84 formed in the base plate 1. A pressing pin 85 is provided that projects toward the upper surface side and presses the front edge 22B of the tip end of the head base 22. The solenoid 82
is fixed to the lower surface of the base plate 1 with a screw or the like (not shown) via a vibration isolating member 88 made of rubber or the like. Further, the connecting pin 81 has its upper end positioned within an elongated hole 87 formed in the base plate 1, and is moved rearward in FIG. It is being urged towards. Here, when the solenoid 82 is energized by the regeneration operation, the play lever 27 is rotated clockwise in FIG. By pressing 22B, the head base 22 is rotated slightly counterclockwise from the state shown in FIG.

Next, the operation of this embodiment will be explained.

In the ejected state, the cassette holder 8 is
The cassette holder 8 is erected as shown by the chain line in FIG. 3, and the roller 72 of the set lever 26 is in contact with the front edge 15B of the engaging cam portion 15 of the cassette holder 8. Therefore, the head base 22, release lever 24, and set lever 26 are in the positional relationship shown in FIG.

In this state shown in Fig. 6, the cassette case C
After loading the cassette holder 8 into the cassette holder 8, the cassette holder 8 is pushed down using the pin 7 as a fulcrum. Then, as the cassette holder 8 is pushed down, the front edge 15B of the engaging cam portion 15 is rotated while slidingly contacting the roller 72. At this time, since the front edge 15B of the engaging cam portion 15 is formed into an arcuate shape centered on the rotation fulcrum of the cassette holder 8, that is, the pin 7, the position of the roller 72 does not displace. The set lever 26 remains stationary. Eventually, when the cassette holder 8 is pushed down to a substantially horizontal state, the front edge 15A of the engagement cam portion 15 comes off the roller 72. Then, the set lever 26 is moved rearward by the tensile force of the spring 75, and is stopped at the position where the cutting piece 73 contacts the elastic member 77 of the adjusting screw 76. Therefore, the impact at this time is alleviated by the elastic member 77.
Furthermore, when the set lever 26 is moved rearward,
Since the roller 72 is located on the upper edge 15A of the engagement cam portion 15, the cassette holder 8 is prevented from returning upward and is held in a horizontal state. At the same time, as the set lever 26 moves rearward, the head base 22 is rotated counterclockwise about the support shaft 21 and is positioned in the state shown in FIG. At this time, since the side edge 22A of the distal end of the head base 22 is formed into an arcuate shape centered on the rotation fulcrum of the head base 22, that is, the support shaft 21, and is held in the annular groove 30 of the guide member 29, the head base 22 is rotated smoothly without being displaced in the vertical direction.

Now, in the state shown in FIG. 7, the head 33 is in light contact with the tape T of the cassette case C, and the pinch roller 46 is separated from the capstan 6. Therefore, in this state, even if a fast-forward or rewind operation is performed, the head 33 is in light contact with the tape T, and the end of the song can be detected by the head 33. Incidentally, when a fast forward operation is performed, the rotation from the motor 2 is transmitted to the reel stand 4B, so that the tape T is wound onto the reel stand 4B side. Further, when a rewinding operation is performed, the rotation from the motor 2 is transmitted to the reel stand 4A, so that the tape is wound onto the reel stand 4A.

On the other hand, when a regeneration operation is performed, solenoid 8
2 is excited, and thereby the play lever 27 is rotated clockwise about the support 28 as a fulcrum. Then, the pressing pin 85 of the play lever 28 presses the front edge 28B of the tip end of the head base 22, and the head base 22 is slightly rotated counterclockwise about the support shaft 21, and is positioned in the state shown in FIG. Ru. At this time, since the front edge 22B of the tip end of the head base 22 is formed into an arc shape centered on the rotation fulcrum of the play lever 27, that is, the pillar 28, the solenoid 82 may Even if the stroke changes, the rotation angle of the head base 22 can always be kept constant. Furthermore, with the rising wall 44A of the pinch roller arm 44 in contact with the stopper mechanism 47, as the head base 22 rotates, the pinch roller arm 44 moves toward the stopper mechanism 47.
As a result of the pinch roller 46 being rotated clockwise about the contact point 7 as a fulcrum, the pinch roller 46 is brought into pressure contact with the capstan 6 . The pressing force of the pinch roller 46 against the capstan 6 can be achieved by adjusting the adjustment screw 51 of the stopper mechanism 47 and changing the compression force of the spring 53. Therefore, the reproducing operation is performed in the state shown in FIG. 8, that is, in the state in which the head 33 is in complete contact with the tape and the pinch roller 46 is in pressure contact with the capstan 6. When the regeneration operation is completed, the solenoid 82 is demagnetized,
The state shown in FIG. 7 is restored.

In the eject operation, the eject lever 38 is pushed downward in the state shown in FIG. Then, the roller 40 of the eject lever 38 presses the roller 32 of the head base 22 backward, so that
The head base 22 is rotated clockwise about the support shaft 21 as a fulcrum. Then, as the head base 22 rotates, the release lever 24 is moved rearward. As a result, the rotating arm 68 of the recording prevention mechanism 66 is rotated counterclockwise about the support 60, and as a result, the detector 69 is separated from the cassette case C. At the same time, the rotation of the head base 22 moves the set lever 26 forward. Then, when the roller 72 of the set lever 26 comes off the upper edge 15A of the engagement cam portion 15, the cassette holder 8 is moved to the pin 7 by the tensile force of the spring 12.
It is rotated upward using the fulcrum as the fulcrum. At this time, a stopper piece (not shown) of the cassette holder 8 hits the edge of the opening formed in the base plate 1, and the rising angle of the cassette holder 8 is restricted to a predetermined angle.

In this way, a series of operations based on loading, fast-forwarding, rewinding, playing, and ejecting the cassette case are performed.

Therefore, according to this embodiment, the base plate 1
Since the proximal end of the head base 22 having the head 33 in the middle is rotatably supported on the reel stand 4A side of the reel, the operation can be made smoother than in the conventional system in which the head base is moved in parallel. . Furthermore, the tip of the head base 22 is formed into an arcuate shape centered on the pivot point of the head base 22, and is slidably held in the annular groove 30 of the guide member 29, so that the head base 22 can be moved vertically. The head 33 can be rotated in a horizontal state without being displaced relative to the tape, and therefore the vertical position of the head 33 can be accurately aligned with respect to the tape.

Also, a cassette holder 8 is attached to the base plate 1.
A set lever 26, which is moved by the flipping operation, and a play lever 27 and an eject lever 38, which are rotated by the playback operation, are provided, and the head base 22 can be moved to three angular positions in conjunction with the operation of these levers. 33 is away from the tape and the pinch roller 46 is away from the capstan 6 in the first angular position, when the set lever 26 is moved, the head 33 is in light contact with the tape and the pinch roller 46 is in the second angular position away from the capstan 6. When the play lever 27 is rotated from this second angular position to the third angular position where the head 33 is in complete contact with the tape and the pinch roller 46 is in pressure contact with the capstan 6, the play lever 27 is rotated from the second angular position. When the ejector lever 38 is operated from this position, it can be switched to the first angular position.
The cueing function can be set simply by changing the rotation angle of the head base 22. Therefore, the pinch roller 46 is operated separately from the mechanism that operates the head base 22.
There is no need to provide a mechanism to operate the functions independently.

Further, when the set lever 26 is moved by the downward movement of the cassette holder 8, an adjustment screw 76 is provided which comes into contact with the set lever 26, and this adjustment screw 76 adjusts the amount of movement of the set lever 26, that is, the second angular position of the head base 22. can be adjusted, so the contact pressure of the head 33 against the tape can be finely adjusted. Furthermore, since the adjustment screw 76 is provided with the elastic member 77, the impact of the set lever 26 can be alleviated. Furthermore, the front edge 22B of the tip end of the head base 22, which is pressed by the pressing pin 85 of the play lever 27, is formed into a circular arc shape centered on the rotation fulcrum of the play lever 27, that is, the pillar 28, so that the play lever 27 can be rotated easily. Even if the stroke of the moving solenoid 82 changes, the head base 22 can always be aligned to the third angular position.

Further, the central portion of a pinch roller arm 44 is supported at the tip of the head base 22, and a pinch roller 46 is provided at one end of the pinch roller arm 44.
Since the stopper mechanism 47 faces the other end, when the head base 22 is rotated from the second angular position to the third angular position, the pinch roller arm 44 is in a state in which the other end is in contact with the stopper mechanism 47. The pinch roller 46 at one end is rotated by the capstan 6.
is pressed against. Therefore, even if the rotation angle of the head base 22 is small, the amount of displacement of the pinch roller 46 can be large, so that the capstan 6
The tape can be run while being reliably sandwiched between the roller and the pinch roller 46. Moreover, the pressing force of the pinch roller 46 against the capstan 6 can be adjusted by changing the compressive force of the spring 53 using the adjusting screw 51 of the stopper mechanism 47.
Can be adjusted.

In the above embodiment, the set lever 26 is moved rearward as the cassette holder 8 is lowered, and the head base is rotated by the movement of the set lever 26. Regardless, the head base 22 may be rotated to the second angular position by moving the set lever 26, for example, by pressing an operation button.

Further, as a means for rotating the play lever 27, in addition to the solenoid 82 described in the above embodiment, the play lever 27 may be rotated directly or indirectly by pressing the play operation button. .

As described above, according to the present invention, it is possible to provide a pinch roller drive device for a tape deck in which the amount of movement of the pinch roller can be increased even with a slight rotation of the head base, and at the same time, the head base can operate smoothly.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a plan view, Fig. 2 is a sectional view taken along the line - - of Fig. 1, and Fig. 3 is a plan view.
The figures are a sectional view taken along the line -- in Fig. 1, Fig. 4 is a sectional view taken along the - line in Fig. 1, Fig. 5 is an exploded perspective view, and Fig. 6 is a plan view showing a part of the state before the cassette case is installed. FIG. 7 is a plan view showing a part of the state after the cassette case is attached, and FIG. 8 is a plan view showing a part of the playback state. 1... Base plate, 4A, 4B... Reel stand, 6... Capstan, 22... Head base, 33... Head, 44... Pinch roller arm, 45... Spring, 46... Pinch roller, 47
... Stopper mechanism, 48 ... Holding frame, 51 ...
Adjustment screw, 52...stopper pin, 53...spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a tape deck that runs a tape mounted on a pair of reel stands while being held between a capstan and a pinch roller and winds it from one reel stand to the other, the base plate on the one reel stand side of the
A base end of a head base having a head in contact with the tape at an intermediate portion is rotatably supported, a pinch roller arm is rotatably provided at the tip of the head base, and one end of the pinch roller arm is connected to the capstan. A pinch roller in contact with the tape is rotatably provided, and a spring is provided to urge the pinch roller arm to rotate in a direction in which the pinch roller moves away from the capstan, and the base plate is provided with a spring that biases the pinch roller arm in a direction in which the head comes into contact with the tape during a playback operation. a stopper that abuts and locks the other end of the pinch roller arm when the head base is rotated, and rotates the pinch roller arm in a direction in which the pinch roller contacts the capstan against the biasing force of the spring; A tape deck pinch roller drive device characterized by having a mechanism. (2) Utility Model Registration In claim 1, the stopper mechanism includes a holding frame fixed to the base plate, and a holding frame that is slidably provided on the holding frame, and a tip thereof is connected to the other end of the pinch roller arm. a stopper pin that contacts and rotates the pinch roller arm in the direction in which the pinch roller contacts the capstan; a spring that urges the stopper pin toward the other end of the pinch roller arm; A pinch roller drive device for a tape deck, comprising an adjustment screw that changes compression force.