JPS5982654A - Drivng device of pinch roller - Google Patents

Abstract

PURPOSE:To increase the driving force of a pinch roller and to stabilize surely the driving operation of the pinch roller by constituting a link of a toggle structure when the pinch roller is press-contacted with a capstan shaft by the turning force of a tape driving motor and a load is increased. CONSTITUTION:When the turning force of the motor 7 is transmitted to a pulley 45 through a belt 47, a rotary shaft 44 is rotated, and a gear 25 is rotated in the clockwise direction through a worm gear 46, gear 26 (gear parts 33, 32) and a gear 38 successively; the 1st link 48 is rotated, the 2nd link coupled with the 1st link through a shaft 51 is also rotated then a pin 52 fixed on the 2nd link 50 moves in the direction of the arrow R while being guided by a long hole 54. Consequently, a sliding plate 55 slides right by the pin 52, a lever 62 is rotated around a shaft 61 in the clockwise direction by a pin 60 fixed on the sliding plate 55. Subsequently, a sliding plate 65 slides in the direction of the arrow L, a pin 70 is driven, a pinch roller supporting body 68 is rotated around a shaft 69 in the counteclockwise direction, then the pinch roller 8 is press-contacted with a capstan shaft 4.

Description

[Detailed Description of the Invention] Industrial Application Field Is the present invention magnetic edict reproduction? The present invention relates to a pinch roller drive device used in a 4f5 device, particularly a cassette type magnetic recording/reproducing device.

Conventional configuration and its problems Conventionally, a magnetic recording and reproducing device uses a magnetic tape drive motor to drive a board with several pinch rollers and a magnetic head, and suppresses the pinch roller to a capstan shaft. There is.

However, this type of conventional device decelerates the rotation of the motor and converts rotational motion into linear motion to drive the pinch roller and magnetic head mounting board, and the load characteristics and pinch roller driving force characteristics are There were points of disagreement. That is, although the load increases when the pinch roller presses against the capstan, the force for driving the pinch roller does not increase, and there is a problem in that the driving operation becomes unstable at this point.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks of the prior art, and provides reliable pinch roller drive by increasing the driving force of the pinch roller when the load of the pinch roller against the capstan increases. It is an object of the present invention to provide a pinch roller drive device that performs the following operations.

Structure of the Invention In order to achieve the above object, the present invention uses a link mechanism to convert rotational motion into linear motion to drive the pinch roller, and in particular, by configuring the link to a toggle configuration, the present invention provides a link mechanism that converts rotational motion into linear motion to drive the pinch roller. The present invention is characterized in that the pinch roller driving force is increased.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a magnetic recording and reproducing apparatus equipped with a pinch roller driving device of the present invention.

In FIG. 1, 1 is a chassis, 2 is a side plate fixed to the chassis 1, and 3 is a cassette holder supported on the side plate 2 so as to be movable downward.・- is inserted. When the cassette half is inserted into the cassette holder 3, the cassette boulder 3 is moved downward by the elastic force of the spring and enters the playback state.

4 is a capstan shaft rotatably supported by the shaft 1, 5 is a sliding board slidably supported on the upper surface of the gloss 71, and the sliding board 5 has several magnetic heads 6. I'm being kicked. Reference numeral 7 denotes a motor, and the rotational force of the motor 7 is transmitted to the flywheel via a belt, and rotates the capstan shaft 4 integrally provided with the flywheel. The rotational motion of the motor 7 is decelerated and converted into linear motion, which becomes a driving source for driving the sliding substrate 5. Reference numeral 8 denotes a pinch roller, and this pinch roller 8 moves in the direction of the capstan shaft 4 as a slide plate, which will be described later, moves, and comes into contact with the capstan shaft 4. Further, as the slide plate (described later) moves, the sliding substrate 5 also moves, and the magnetic head 6 comes into contact with the magnetic tape. The magnetic tape in the cassette half is held between the pinch roller 8 and the capstan shaft 4, and is fed as the gap shaft 40 rotates. 9.
10.11 are the stop lever, fast forward 1/bar,
This is the rewind lever.

The present invention uses the rotational force of the motor 7 as a pinch roller 8.
This invention relates to a pinch roller drive device for moving a capstan in four directions, and an embodiment of the present invention will be explained below.

In FIGS. 2 to 10, a yarn 7 is shown, and at the end of the yarn 1, a substrate 21 is provided perpendicular to the yarn 1, as shown in FIG. 22.23
．． 2/I are shafts fixed to the substrate 21, a gear 25 is rotatably supported on the shaft 22, and d is on the shaft 2;
゛The gear 26 is supported so that it can rotate freely, and the gear 26 is supported by the gear 24.
[The spring 27 and the clutch lever 28 are supported. A portion 25' where no gear is formed is formed on a part of the outer peripheral surface of the gear 25. Also, gear 25
A pin 29 is fixed at an eccentric position on the side surface of the collar 30, and a collar 30 is rotatably supported by the two pins.

31 is a snap ring. The gear 26 has a normal tooth portion 32 and a helical gear portion 33 formed in a negative shape. ;3.1 is a snap ring.

;35 is an E link. A lever 3G is rotatably supported on the base plate 21 by a shaft 37, and a gear 38 meshing with the gear 25 is rotatably supported on the lever 6. 39 is a lever rotatably supported at one end of the lever 36, and this lever: 3! iJ1 is biased in the direction of the shaft 22 by a spring 40 supported by the shaft 37. A long hole is formed at the other end of the above Reno;-36,
A projecting piece 41 of the clutch lever 28 is engaged with this elongated hole. One end of the spring 27 is connected to the bent piece 21 of the board 21.
', and the other end is engaged with the clutch lever 28. Therefore, the clutch lever 28 is biased counterclockwise (FIG. 2) by the spring 27, and therefore, the lever 36 is biased in the open direction (FIG. 2), and the gear 38 is pushed against the gear 25. match. When the clutch lever 28 is rotated in the open direction against the biasing force of the spring 27, the lever 36 is rotated counterclockwise and the gear 38 and the gear 25 are disengaged.

In FIGS. 3 and 4, 42 is a bearing inserted into a hole formed in shear/J and fixed with a nut/I3, and a rotary shaft 44 is rotatably supported by this bearing/I2. There is. d at one end of rotating l1ill144, pulley 4
5 is fixed, and Uono Gear/I6 is fixed to the other end. This worm gear, I6N, meshes with the helical tooth width portion of the gear 26; No'J45
Q'・＼ruto 47 is hung on it. Sundabell l-4
,7U:,Fixed to the rotating shaft of motor 7! It is also driven by a 1/9 pulley (not shown).

In this case, the rotational force of the motor 7 is transmitted to the pulley/I5 via the belt 17, and rotates the rotating shaft 44 and the λ-mgya 46. The rotational driving force of the worm gear 46 is
The signal is transmitted to the gear 25 via the gear portion 32 of the gear 26 and the gear 38. 48 has one end attached to the bent portion 20 of the chassis 1 and the shaft 7
7, and this link 48 has a bent elongated hole 49 formed therein. A collar 30 supported by the pin 29 of the gear 25 is inserted into the elongated hole 49. 50 is a second link supported by a shaft 51 on the link 48, and a pin 5 is attached to the other end of the second link 50.
2 is fixed. 53 is a bent piece obtained by bending a part of the chassis 1, and this bent piece 53 has a long hole 54 formed in the horizontal direction. Pin 52d fixed to the other end of the second link 50: the bent portion is inserted into the elongated hole 54 of the piece 53. Reference numeral 55 in FIG. 4 is a slide plate that is slidably supported in the horizontal force direction by pins 56 and 57 provided on the yarn 1, and a hole is formed in the bent portion of the slide plate 55. The pin 52 of the second link 50 is inserted into this hole. Therefore, pin 5
2, the slide plate 55 slides. 58 is a spring whose one end is locked to the pin 56 and the other end is locked to the protrusion 59 of the slide plate 55, and the force of this spring 580 causes the slide plate 55 to move in the left direction (left direction) in FIG. ) is being visited. 60 is a pin fixed to one end of the slide plate 55, 61 is a shaft fixed to the gloss 71, and a lever 62 is rotatably supported on this shaft 61. A long hole 63 is formed at one end of the lever 62, and a pin 60 of the slide plate 55 is inserted into this long hole 63. 6/I is a pin fixed to the other end of the lever 62, and 65 is a slide plate slidably supported by a pin 66 fixed to the shear 71. Insert the pin 64 of the lever 62 into the hole 67.
has been inserted. G8u: A pinch roller support rotatably supported by a shaft 69 fixed to the yarn 1, and the pinch roller 8 is pivotally supported on this pinch roller support 68.

Reference numeral 70 denotes a pin implanted in the pinch roller support 68, and this pin 70 is inserted into the cam hole 71 of the slide plate 65. 4 is a capstan shaft rotatably supported by the chassis 1. A rotating lever 72 is rotatably supported by the pin 57, and a magnetic member 73 is fixed to the tip of the rotating lever 72. The rotating lever 72 is biased counterclockwise by a spring 84 supported by the pin 57, and a cam portion 85 provided on the rotating lever 72 is in contact with the pin 74 provided on the slide plate 55. . When the slide plate 55 moves in the J direction, the pin 74 comes off the cam part 85, rotates counterclockwise, and the magnetic member 73 is attracted by the electromagnet 75 fixed to the chassis 1.

In addition, in FIG. 1, the other pinch roller is omitted.

FIG. 7 shows the relationship between the slide plate 65 and the sliding substrate 5 to which the magnetic head 6 is attached.

The sliding board 5 is slidably supported by the chassis so that it can slide in the same direction as the sliding board 65. Reference numeral 76 denotes a spring that is engaged with the slide plate 65 and the sliding base plate 5. When the slide plate 65 slides in the direction approaching the capstan shaft 4 (leftward direction of arrow X), the sliding base plate 5 is moved by the spring 76. Slide in the direction of the arrow.

Next, the operation of the above embodiment will be explained. In FIG. 1, when a cassette half is inserted into the cassette holder 3 from the direction of arrow a, insertion of the horn set half is detected;
A switch (not shown) is closed and the motor 7 rotates.

When the horn set half is inserted into the cassette holder 3, the cassette holder 3 descends and enters the playback state.

The rotational force of the motor 7 is transmitted to the pulley 45 via the belt 47 and rotates the rotating shaft 44. The rotational force of the rotating shaft 44 is transmitted to the gear 25 via the worm gear 71G, the helical gear part 33 of the gear 2G, the conical part 32 of the gear 26, and the gear 38, and moves the gear 25 clockwise in FIG. Rotate it.

In FIG. 3, when the gear 25 rotates clockwise, the first link 48 rotates as the gear 25 rotates. When this link/18 rotates, the second link 50 connected to this first link 48 by a ligament 51 also rotates, and the pin 52 fixed to the second link 50 moves to the chassis shown in FIG. It is guided by the elongated hole 54 formed in the bent part 5; 3 of 20 and moves to the right (in the direction of the arrow).

When the pin 52 fixed to one end of the second link 50 moves to the right in FIG. 3, the slide plate 55 that engages with the pin 52 also slides to the right by the pin 52.

When the slide plate 55 moves to the right, this slide plate 5
a lever 62 with one end engaged with a pin 60 fixed to 5;
d[, rotates clockwise (FIG. 4) around tIl+61.

When the lever 62 rotates clockwise, the slide plate 65 that engages with the pin 64 of the lever 62 slides to the left (in the direction of the arrow). When the slide plate 65 slides in the direction indicated by the arrow, the pin 70 that engages with the cam hole 71 of the slide plate 65 is driven, and the pinch roller support 68 is rotated counterclockwise about the shaft 69. The pinch roller 8 is pressed against the capstan shaft 4, the magnetic tape is held between the pinch roller 8 and the capstan shaft 4, and the magnetic tape is fed. Moreover, when the slide plate 65 slides in the L direction,
This sliding movement is also transmitted to the sliding substrate 5 via the spring 76, so that the sliding substrate 5 also slides in the L direction, and the magnetic head 6 also moves in the L direction and comes into contact with the magnetic tape. Further, in accordance with the sliding movement of the slide plate 55 in the It force direction, the rotating renocou 72 rotates counterclockwise in FIG. 4 and is attracted by the electromagnet 75. At the stage where -72 is attracted to the electromagnet 75 by rotation, the gear 38 in FIG. 2 is located at the portion 25' of the gear 25,
The rotational driving force of the gear 38 is not transmitted to the gear 25.

FIGS. 5 and 6 show this state.

In the state shown in FIGS. 5 and 6, when the power supply to the electromagnet 75 is stopped, the attraction of the magnetic member 73 is released, and the tension of the spring 58 causes the slide plate 55 to move to 1. Return to direction. The lever, lever 62, slide plate 65, etc. return to the state shown in FIGS. 3 and 4. In this return process, the gear 25 rapidly rotates in the opening direction in FIG. 5 and returns to the state shown in FIG. 3.

8 and 9 show the relationship between the gear 25 and the links 48, 50. In the state shown in FIG. 8, when the gear 25 is rotated in the opening direction by the driving force from the motor 7,
The link 48 rotates about the shaft 77 in the opening direction,
In accordance with the rotation of the link 48, the link 50 also moves, and the pin 52 provided at one end of the link 50 moves in the It force direction as shown in FIG. Due to this movement of the pin 52, the pinch roller 8 is finally pressed against the capstan ili/I as described above, and the magnetic nozzle 6
moves and comes into contact with the magnetic tape.

FIG. 10 shows the relationship between the stroke and force of the slide plate 55 in the conventional example and the above-mentioned example. When a link mechanism is used as in this example, the pinch roller 8 is attached to the capstan shaft 4. At the crimping position, a larger driving force can be applied than in the conventional example.

FIG. 11 shows a pinch roller mechanism in another embodiment of the invention. In FIG. 11, 1 is the chassis, 6
8 is a pinch roller support rotatably supported by iIl+69 installed in the chassis 1; 8 is a via roller;
70 is a pin provided on the pinch roller support 68, and this pin 70 is inserted into a cam hole 71 of the slide plate 65. 78 is a protrusion provided on the side plate 79a of the pinch roller support 68 on the side of the leg 69. 80 is an arm rotatably supported by the shaft 69, and this arm 8 (+
&: J-G It rotates between the upper plate and the lower plate of the pinch roller support body 68. 81 is a protruding piece formed at the tip of the arm 80, and a tension spring 82 is disposed between this protruding piece 81 and the protruding piece 78 of the pinch 1-ra support 68. The arm 80 is biased in the special training direction, and the free end d of the arm 80 is connected to the pinch roller support 6.
8 side plate 791]. 83 is a pin formed on the arm 80, and this pin 83 is also inserted into the hole 71.

When the slide plate 65 in FIG. 4 slides in the L direction,
This slide plate 65 allows the pin 8 in FIG.
3 is driven, and the arm 80 and the pinch
i 8 rotate counterclockwise 2, the pinch roller 8 comes into contact with the capstan shaft 4, and the pinch roller support 6
8 stops rotating. P/8:3 by slide plate 65
When the arm 80 is further driven, only the arm 80 rotates counterclockwise. Therefore, the tension spring 82 is pulled, and this spring force urges the pinch roller support 68 in a counterclockwise direction, so that the pinch roller 8 is strongly pressed against the capstan shaft 4.

Effects of the Invention The present invention (d) has the above-mentioned configuration, and when the pinch roller is pressed against the capstan shaft and the load increases, the link is configured as a toggle to increase the pinch roller driving force and reduce the pinch roller drive. This is effective in that the operation can be reliably stabilized.

In addition, the approach operation of the pinch roller is performed using motor power, and the pinch roller is pressed and held using a solenoid.
When the power is turned off, the pressure between the pinch roller and the capstan is released, so the pinch roller, which has stopped rotating when not in use, is released from the pressure on the capstan.
This eliminates the problem of rubber tires deforming.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic recording and reproducing device equipped with a pitch roller drive device of the present invention, FIG. 2 is an exploded perspective view of the back of a pinch roller drive device according to an embodiment of the present invention, and FIG. 3 is a perspective view of the same device. Fig. 4 is a front view of the same, Fig. 5 is a front view of the device when the pinch roller is crimped, Fig. 6 is a top view of the same, and Fig. 7 is a top view of the slide plate and sliding substrate of the device. 8 and 9 are explanatory diagrams of the operation of the link mechanism of the same device, FIG. 10 is a diagram showing the relationship between the stroke and force of the pinch roller of the conventional example and the present invention device, and FIG. 1I is a diagram of the present invention. FIG. 7 is an exploded perspective view of a pinch roller mechanism according to another embodiment. 1.../yarn, 2...1tllll&,:! ...Cassette holder, A...Capstan shaft, -5...
Sliding board, 6...Magnetic head, 7...Motor, 8...
Pinch roller, 9... stop lever, 10 - fast forward lever, 11... rewind lever, 20... bending part,
21... Board, 22.23.2... ILQII, 2
5.26... Gear, 27... Spring, 28 ・
Clutch lever - 129... pin, 3o... collar,
31... Snap ring, 32... Gear part, 33.
・Helical gear part, 34...Snap ring, 35・
... ■ Riring, 3G... Lever, 37... Shaft, 3
8...Gear, :+! l...Lever, 40...Suffling, 41...Protrusion piece, 42...IIq (1 receiver, 4 to...
Nut, 44...rotating shaft, /15...pulley, 4G
・Worm gear, 47 ・Bell l-148・Link, 49 ・Elongated hole, 50-Link, 51 ・Shaft, 52・
- Pin, 53... Bent piece, 54... Long hole, 55...
・Slide plate, 56.57...pin, 58...spring, 59...protrusion, 6o...pin, 61...shaft,
62... L/Gover 63... Long hole, 64... Pin, 65... Slide plate, 66... Pin, 67... Hole,
68...pinch roller support, 69...++q++
, 7o...pin, 71...cam hole, 72...rotating lever, 7:3...magnetic member, 74...pin, 75...
・Electromagnet, 76... Spring, 77... Shaft, 78
... Projection piece, 79a179b ... Side plate, 80 ... Arm, 8I ... Projection piece, 82 - Tension spring, 83 - Pabin, 84° path sprinkle, 85 Pa - cam part. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 4 Figure 2 Figure 3 Figure 5 Figure 9-371

Claims (2)

[Claims] (1) A deceleration means for decelerating the rotational force of the motor, and a first
a link means having a link and a second link and converting the rotational motion decelerated by the deceleration means into linear motion, and a slide plate slid by the link means;
A pinch roller drive device comprising a pinch roller support means that is rotated based on the sliding of the slide plate. (2) The pinch roller drive device according to claim 1, wherein the first link and the second link constitute a trouble mechanism.