JPS61280068A - Link drive device - Google Patents

Abstract

PURPOSE:To obtain a small-sized link drive with less number of parts by employing a combination of an epicyclic gear and a cam. CONSTITUTION:A pinion gear 34 engages with the epicyclic gear 35. An internal gear 36, an A-carrier 41 and B-carrier 43 are sequentially penetrated in lamination by a cam post 45 fixed on a main base 32. And further, a C-planet gear 44 engages with the gear formed on the B-carrier 43. A mode change-over cam 46 is decelerated and driven at a prescribed speed by the C-planet gear 44. And, a cassette-lateralizing and head base retreating cam 47 as well as a cassette-erecting cam 48 are also decelerated and driven at another prescribed speed. A motion rocking link 52 is driven by the rotation of the motion-mode change-over cam 46. In a part of the peripheral surface on the lower side of the cam 47, a notch 61 is formed, with which a head base retreating link 62 engages. And in the upper surface of the cam 47, a cam groove 63 is formed. One end of a cassette horizontally rocking link 64 is engaged with the endless groove of loop-form.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a link drive device, and particularly to a link drive device for driving a cassette loading/unloading mechanism or an operation mode switching mechanism of a cassette tape recorder or the like.

[Prior Art] A conventional link drive device will be described by taking a cassette loading/unloading mechanism and an operation mode switching mechanism of a cassette tape recorder as an example.

FIG. 14 is a diagram showing an example of a conventional cassette loading/unloading mechanism in a cassette tape recorder.

In the figure, 1 is a cassette mounting/ejecting cam, and a cam groove 2 is formed on its main surface. Further, the central axis of the cam 1 is provided with a cylindrical portion 3, and the cylindrical portion w13 is provided with a cam groove not shown in the drawing. The cassette mounting/ejecting cam 1 is connected to a drive source 4 such as a motor, and the cassette mounting/ejecting cam 1 is rotated by the drive source 4 .

One end of a substantially single-shaped first swing link 5 is engaged with the cam groove 2, and the other end of this swing link 5 is slidably engaged with the slider pack 6 in a pairwise manner. Then, install the cassette
When the discharge cam 1 is rotated, the first swing link 5 swings, and the slider pack 6 slides in the vertical direction in the figure. The slider pack 6 regulates the IF of the inserted cassette tape in the horizontal direction (corresponding to the vertical direction in FIG. 14) by such a sliding operation.

The working end of the second swing link 8 is engaged with a cam groove formed in the cylindrical portion 3 of the cam. The second swing link 8 has a relatively wide surface area, and its negative side (lower side in FIG. 14) engages with the holder cassette 9 in a rotating pair. Further, the second swing link 8 is rotatably held at the upper left and right sides in the figure by a base arm 10, only a portion of which is shown. In response to the rotation of the cassette loading and ejecting cam 1, the second swinging link 8 swings around the support section of the base arm 10, and moves the holder cassette 9, which is engaged in a rotational pair, in the vertical direction ( (in the figure, perpendicular to the paper). Through this operation, the holder cassette 9 regulates the vertical position of the cassette tape 7.

FIG. 15 is a diagram showing an example of a conventional operation mode switching mechanism provided in a cassette tape recorder.

Referring to FIG. 15, the operation mode switching mechanism includes drive mi
i, the operation mode switching cam 12, the swing link 13,
It is composed of a mode plate 14. The operation mode switching cam 12 has a circular cam groove 15 eccentrically formed with respect to the central axis of the cam 12 on its main surface. One end of the swing link 13 is engaged with this cam groove, and the other end is engaged with the mode plate 14 in a rotating pair. Therefore, when the operation mode switching cam 12 is rotated by the drive source 11, the swing link 13 swings about the fulcrum 16, causing the mode plate 14 to slide vertically in FIG. 15. The mode plate 14 is moved by the swing link 13, and its stop position controls the position of the pinch roller, rest idler, etc.
Switch to the required operating mode.

Conventional cassette loading and ejecting mechanisms and operating mode switching mechanisms are constructed as described above, and some are equipped with a dedicated motor 4.11 as a driving lees, and others are driven by a main motor for running the cassette tape. ! ! +? 14.
There were many types, such as those that take out 11, but all of them have a cassette loading/ejecting mechanism and an operation mode switching a.
m was constructed separately and independently. Therefore, each mechanism required a separate drive source and cam, that is, a link drive device.

The table on the next page is a list showing the drive source of the cassette loading/ejecting mechanism and the operation mode switching mechanism in a conventional cassette tape recorder, as well as the control method in that case. Ejection and operation [Problems to be solved by the invention] In the conventional cassette loading/ejection and operation mode switching mechanisms, as shown in the table above, both have a configuration in which the main motor is the driving source, and a dedicated There is a configuration in which a motor is used as a driving source. In the case of a configuration in which the main motor is the driving source, a plunger compatible with the cassette loading/ejecting mechanism and a link drive device to obtain the necessary operating force are required, and a plunger compatible with the operating mode switching mechanism is required. It can be seen that a link drive is required to obtain the required operating force. Therefore, for example, in a cassette tape recorder, in most cases, while the cassette tape is running (playing state), the link drive device for the above-mentioned mechanism, which is unrelated to the running of the cassette tape, must be constantly rotated. First, there was a problem that tape running etc. became unstable. In addition, in many cases, the plunger is driven depending on the on/off state of the solenoid, and the necessary mode is extracted. A complicated type requires three or four solenoids, which has the disadvantage of being expensive and large in size.

Furthermore, when a dedicated motor is used as the drive source, a dedicated motor and link drive device are required. Therefore, the device as a whole naturally becomes larger and more expensive.

Furthermore, it is possible to consider a design in which either one is driven by the main motor and the other is driven by a dedicated motor.
Even in that case, a link drive device is required to obtain the necessary force, and the problems of a large space and an increase in the number of parts have not been solved.

Therefore, what is the main purpose of this invention? ! ! It is an object of the present invention to provide a small link drive device that can be commonly used for several mechanisms and has a small number of parts.

[Means for Solving the Problems] The present invention provides a first cam and 112 cams for driving a link, a planetary gear mechanism for driving the cams, and a first cam and a second cam. This is a link drive device including a lock mechanism that selectively closes the.

[Operation] Both the first link drive cam and the second link drive cam are rotated about the shaft by a planetary gear mechanism. Since the first link driving cam and the second link driving cam have different meshing methods with the planetary gear mechanism, they are rotated at different rotational speeds. Moreover, the rotation of the first link drive cam or the second link drive cam is selectively blocked by the lock mechanism.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described by taking a cassette tape recorder having an auto-reverse function as an example.

However, the present invention is applicable not only to cassette tape recorders but also to VTRs and DATs.

It should be pointed out in advance that the invention can also be applied to other drive mechanisms.

FIG. 1 is a side sectional view showing the structure of a link drive device of a cassette tape recorder having an auto-reverse function. In this example, the link drive device is a planetary gear system! !
The configuration includes 35.

Referring to FIG. 1, a power motor 31 is fixed to a main base 32 of a cassette tape recorder. The power motor 31 is a thin flat motor, and a pinion gear 34 is fixed to a rotating shaft 33 that projects upward from a main base 32. The pinion gear 34 is a planetary gear device! 3b and drives the planetary gear set [35].

The planetary ms device W135 includes an internal gear 36, a fixed internal gear 37,
AM star gear 38, A carrier 41, B planetary gear 42, B
It is composed of a carrier 43 and a C planetary gear 44. Internal gear 36, A carrier 41 and B carrier 43
is attached to the cam post 45 fixed to the main base 32,
They are inserted in a laminated manner in order, and each cambost 4
It can be rotated around 5. Fixed internal gear 3
7 is fixed to the main base 32. Internal gear 36
is meshed with the pinion gear 34 and the A planetary gear 38, and rotates around the cam post 45 as the pinion gear 34 is driven. The rotational force of the internal tooth JI36 is transmitted to the A'T1 star tooth *38. The planetary gear 38 is the A carrier 41
It is rotatably supported by and rotates while meshing with the internal gear 36 and the fixed internal gear 37. Therefore, the rotational force of the internal gear 36 is reduced through the AI double gear 38,
It is transmitted to the A carrier 41. A gear formed on the A carrier 41 meshes with an eight planetary gear 42. The B planetary gear 42 is rotatably supported by the B carrier and rotates while meshing with the A carrier 41 and the fixed internal gear 37. Therefore, the rotational force of the A carrier 41 is the same as that of the B planetary gear 4.
2, and is transmitted to the B carrier 43. Further, a C planetary gear 44 meshes with a gear formed on the B carrier 43. And this C, MIJI car 44
Accordingly, the mode switching cam 46 is driven to a certain predetermined speed, and the cassette horizontal/head base retraction cam 47 and the cassette vertical cam 48 are also decelerated to another predetermined speed.

The operation mode switching cam 46 is rotatably engaged with the B carrier 43, and rotates around the B carrier 43, or in other words, the cam post 45.

A cam groove 51 having a predetermined loop shape (endless shape), which will be described later, is formed on the lower surface side of the operation mode switching cam 46. An operating swing link 52 is fitted into the cam groove 51 . Therefore, the rotation of the operation mode switching cam 46 drives the operation swing link 52. In addition, the cam groove 5
A roller 53 is inserted between the movable swing link 52 and the movable swing link 52 to reduce the force generated between the two and to ensure smooth transmission of movement.

A locking recess 54 is formed in a part of the outer peripheral surface of the operation mode switching cam 46. A lock bin 55 can be held in the locking recess 54 .

A cassette horizontal/head base retraction cam 47 having a support shaft of the CaW gear 44 is rotated around the cam post 45 by the rotation of the C planetary gear 44 .

A notch 61 is formed in a part of the outer peripheral surface of the lower surface side of the cassette horizontal/head base retraction cam 47.
The head base retraction link 62 is engaged with the head base retraction link 62. Therefore, as the cassette horizontal/head base retraction cam 47 rotates, the head base retraction link 62 moves into the notch 6.
1 or the outer peripheral surface of the cam 47, and the head base retraction link 62 is swung.

A cam groove 63 is formed on the upper surface side of the cassette horizontal/head base retraction cam 47. The cam groove 63 is a predetermined loop-shaped endless groove, as will be described later. One end of a cassette horizontal swing link 64 is engaged with this cam groove 63 . Therefore, due to the rotation of the cassette horizontal/head base retraction cam 47, the cassette horizontal swing link 6
4 performs a predetermined swinging motion. Note that a roller 65 is also inserted between the cam groove 63 and the cassette vertical swing link 64 in order to prevent friction between the two and smooth the engagement between the two.

A cassette vertical cam 48 is fixed to the cassette horizontal/head base retraction cam 47. Therefore, as the cassette horizontal/head base retraction cam 47 rotates, the cassette vertical cam 48 similarly rotates around the cam post 45. A cam groove 66 is provided on the bottom surface of the cassette vertical cam 48.
is formed. One end of a cassette vertical swing link 68 is engaged with this cam groove 66 via a roller 67.

In this embodiment, the cassette horizontal/head base retraction cam 47 and the cassette vertical cam 48 are made separately and are fixed together, but the cassette horizontal/head base retraction cam 48 and the cassette vertical cam 48 are It may be integrally molded.

A notch 71 is formed in a part of the outer peripheral surface of the cassette horizontal/head base retraction cam 47. The lock bin 55 can be engaged with this notch 71.

The lock bin 55 is a protrusion formed on the lock plate 56. The lock plate 56 can move up and down as shown in the arrow 59, and when it moves downward as shown in the figure, the lock pin 55 moves to the operating mode switching cam 46.
, and prevents rotation of the operation mode switching cam 46. Furthermore, when the lock plate 56 moves upward, the zero lock pin 55 engages with the notch 71 of the cassette horizontal/head base retraction cam 47 and prevents the rotation of the cassette horizontal/head base retraction cam 47 and the cassette vertical cam 48. It is made to be. As described above, by the movement of the lock plate 56, the lock pin 55 prevents the rotation of either the operation mode switching cam 46 or the cassette horizontal/head base retraction cam 47 (and the cassette vertical cam 48), and when the cassette tape is moved, the lock pin 55 is prevented from rotating. The mode is fixed to a predetermined mode, and the cassette is not loaded or ejected while the cassette tape is being driven.

Note that the mode switching brush 72 provided on the upper surface of the cassette vertical cam 48 is configured to come into contact with the mode switching circuit 74 provided on the lower surface of the upper base 73, and the mode switching brush 72 and the mode switching circuit 74 are arranged in contact with each other. The rotation angle of the cassette vertical cam 48 (and the cassette horizontal/head base retraction cam 47), that is, the current position for driving the cassette is detected by the contact position with the cassette vertical cam 48 (and the cassette horizontal/head base retraction cam 47).

Next, FIGS. 2 and 3 will be explained. 2 and 3 are diagrams for explaining a link mechanism driven by the cassette horizontal/head base retraction cam 47 of FIG. 1.

First, FIG. 2 is a plan view showing a horizontal blowing and discharging mechanism for a cassette tape. FIG. 3 is an exploded perspective view for explaining the coupling relationship between the cam 47 and the link mechanism shown in FIG. 2. First, with reference to Figures 2 and 3,
The horizontal blow-in and discharge system for cassette tapes will be explained.

On the top surface of the cassette horizontal/head base retraction cam 47,
As explained in FIG. 1, a cam groove 63 for horizontally swinging the cassette is formed. Cassette horizontal swing link 64
has a substantially V-shaped or substantially fan-shaped planar shape, and its leading end is rotatably supported by a post 81 protruding from the main base 32. Cassette horizontal swing link 6
The negative end of 4 engages with the cam groove 63 as described above, and the gear 82 is formed at the other end. And this gear 82
The horizontal connection link 8 is connected to the
4 are combined. The arc amplifying gear 83 and the horizontal connecting link 84 are connected to the holder spring 86,87 and the biasing spring 8.
8 and is rotatably passed through a post 85 that projects vertically upward from the main base 32. Holder spring 86
is engaged with the arc amplification gear 83 and the horizontal connection link 84 so as to rotate the arc amplification gear 83 and the horizontal connection link 84 counterclockwise in FIG.

Further, the holder spring 87 rotates the arc amplification gear 83 and the horizontal connection link 84 clockwise in FIG.
4 is engaged.

Both the holder spring 86 and the holder spring 87 are urged by the urging spring 88, and urge the arc amplifying gear 83 and the horizontal connection link 84 in the above-mentioned respective rotational directions. Therefore, the arc amplifying gear 83 and the horizontal connecting link 84 are always kept in a balanced state by the holder springs 86 and 87.

The arc amplification gear 83 is for amplifying the movement of the cassette horizontal swing link 64 and transmitting it to the horizontal connection link 84. The horizontal connecting link 84 is a curved longitudinal member, and as described above, one end is rotatably supported by the post 85, and a longitudinal small hole 91 is formed in the other end. A protrusion 93 of a slide piece 92 is engaged with the small hole 91 in a rotating pair.

The slide piece 92 is slidable along the long groove 95 of the arm EV, and is used to position the cassette tape 96 in the insertion direction. Arm EV94 is base EV9
7 and the holder EV98, the rear end portion (the frontmost portion in the cassette insertion direction) is supported as a rotation center.

The tip end piece of the arm EV (the rearmost end piece in the cassette insertion direction) engages with the holder force set 101 so as to lift it up. Roughly speaking, the engagement protrusion (not shown) at the upper left end in FIG. 2 engages with the vertical link 103, as shown in FIG.

Next, FIGS. 4 to 6 are diagrams for explaining the vertical lowering and raising mechanism of the cassette tape.

Particularly, FIG. 4 is a plan view, FIG. 5 is a side view, and FIG. 6 is an enlarged perspective view of a connecting portion of the swing link.

Referring to FIGS. 4 to 6, the cassette vertical cam 48
As mentioned above, the cam groove 66 is formed in the lower surface of the cassette vertical swing link 68.
One end of the is engaged. The cassette vertical swing link 68, together with the vertical connecting link 103 and the biasing spring vertical 104, is connected to a post 10 that projects vertically upward from the bottom base.
It is rotatably supported by 2. The cassette vertical swinging link 68 and the vertical connecting link 103 are connected by a biasing spring vertical 104, so that the positional relationship between the cassette vertical swinging link 68 and the vertical connecting link 103 is in a predetermined positional relationship and elastic. is combined with The tip of the vertical connection link 103 engages with an engagement protrusion 105 of the arm EV94.

Next, the operation of the cassette tape loading/unloading mechanism will be explained with reference to FIGS. 2 to 6.

Before the cassette tape 96 is inserted, the cassette tape loading/unloading mechanism is in the state shown in FIG. In this state, when the cassette tape 96 is inserted in the direction of the arrow 106, the tip engaging portion 108 of the slide piece 92 engages with the reel hole 107 on the insertion direction side of the cassette tape 96. Next, the cassette horizontal/head base retraction cam 47 is rotated by the planetary gear system 35 described in FIG. Then, the cassette horizontal swing link 64 moves while being guided by a predetermined loop-shaped cam groove 63 formed on the surface of the cassette horizontal/head base retraction cam 47 eccentrically with respect to the rotation center axis of the cam 47. The motion is amplified by arc amplification gear 83 and transmitted to horizontal connection link 84 .

The horizontal connecting link 84 then rotates in the direction of the arrow 111 in FIG. 2, causing the slide piece 92 to slide. As a result, the cassette tape 96 is taken into the holder cassette 101. The cassette tape 96 is the holder cassette 1
The cassette vertical cam 48 shown in Fig. 4 is loaded into 01.
The cassette vertical swing link 68 is rotated in accordance with the rotation of the cassette, and the rotation is transmitted to the vertical connection link 103. Therefore, the vertical connection link 103 causes the arm EV94 to rotate around the base EV (and the holder EV98, not shown), as shown by the dashed line in FIG. Therefore, the holder cassette 101 is lowered from the state in which the arm EV94 and its upper surface are lined up horizontally, and is in the state shown by the dashed line in FIG. 5. This state is a state in which the cassette tape 96 is mounted in a so-called PLAY state.

In the ejection operation of the cassette tape 96, the cassette tape mounting/ejection mechanism operates in the reverse order by the rotation of the cassette vertical cam 48 and the cassette horizontal/head base retraction cam 47, and the cassette tape 96 is ejected. In this case, the cassette horizontal/head base retraction cam 47 and the cassette vertical cam 48 rotate 1806 times in a predetermined direction to place the cassette tape 96 in the attached state, and then rotate 1806 times in the same direction.
Rotate 80'' to put the cassette tape 96 in the ejected state.

In other words, the cassette is rotated by one rotation of the cam 47.48.
- The tape blowing and discharging operation is completed once.

FIGS. 7 and 8 are diagrams for explaining the head base retraction mechanism. In particular, FIG. 7 is a plan view, and FIG. 7 is a partial side view of the mechanism.

Referring to FIGS. 7 and 8, reference numeral 47 is a cassette horizontal/head base retraction cam.

Cassette horizontal/head base retraction cam 47 shown in FIG.
The reason why the planar shape of the cam 47 is different from that of the cam 47 shown in FIG. 2 is that the cam 47 is shown from above in FIG. This is because only the outer peripheral shape of the lower half of the cassette horizontal/head base retraction cam 47 is drawn in order to explain the operation of the base retraction mechanism. In other words, the cam 47 in FIG.
The shape indicates the outer peripheral shape of the portion of the cam 47 shown in FIG. 1 that is in contact with the spacing base retraction link 62.

The head base retraction link 62 is a longitudinal member, and one end thereof is rotatably supported by the post 81. The other end is in contact with the A link 112. The center portion of the head base retraction link 62 is in contact with the circumferential surface of the cassette horizontal/head base retraction cam 47, and the link 62 is swung around the post 81 as the cam 47 rotates. A-link 112 is a longitudinal member arranged laterally. And the head base retraction link 62
The sides are slidably supported by pins 113 protruding from the side walls of the main base 62. Also, the other end is
It engages with the upper end of the B link 114 in a point-to-point manner. The B link 114 is attached to the side wall of the main base 32 by a pin 115 and rotates around the pin 115. The lower end of the B link 114 engages with one end of the C link 116 in a rotating pair. C link 116 is main base 3
The main base 32 is a longitudinal member arranged parallel to the main base 32, and is rotatably pivoted around a pin 118 set on the main base 32. A protrusion 119 is provided at the other end of the C-link 116, and the protrusion 119 engages with the head base 121. The head base 121 is a substantially T-shaped base, and is connected to the main base 3 by three guides 122, 123, and 124.
2 is slidably held. head base 1
A magnetic head 125 is placed in the center of the magnetic head 21 .

Further, a spring 126 is applied to the head base 121, and the spring 126 causes the head base 121 to
In FIG. 7, it is biased toward the left.

Next, the operation of the head base retraction mechanism will be explained. The head base retraction mechanism moves the head 125 backward, that is, to the right in FIG.
This is a mechanism that moves it so that it does not get in the way of discharge. When the cassette tape is played, the head 125 is positioned as shown in FIG. 7 so that the head 125 comes into contact with the tape surface of the cassette tape.

Now, considering the PLAY state, in that state, the force set horizontal/head base retraction cam 47 is in the state shown in FIG. That is, the notch of the cam 47 is in contact with the head base retraction link 62. Therefore, the A-link 112 is in a state of relative movement in the direction of the arrow 127. Therefore, in this state, the lower end of the B link 114 is on the B side of the arrow 128, and one end of the C link 116 is swung toward the B side of the arrow 129. Therefore, C
The head base 121 that engages with the other end of the link 116 is
It is located on the left side in FIG. 7, and the head 125 is in contact with a tape surface (not shown).

On the other hand, when loading and ejecting a cassette tape, the cassette horizontal/head base retraction cam 47 rotates, and the head base retraction link 62 comes into contact with the circumferential surface of the cam 47. Therefore, the head base retraction link 62 is connected to the cam 4.
Due to the circumferential surface of 7, the position is rotated to the right about the post 81 compared to the state shown in FIG. When this state is reached, the A link 112 is slid in eight directions indicated by arrows 127 by the other end of the head base retraction link 62.

Therefore, the lower end of the B link 114 moves in the direction of arrow 128, and one end of the C link 116 swings in the direction of arrow 129. Therefore, the head base 121 that engages with the other end of the C-link 116 is moved to the right in FIG. 7 against the force of the spring 126. Therefore, the head 125 is moved back to the right from the state of contact with the tape surface.

FIG. 9 summarizes the rotational angles of the cassette horizontal/head base retraction cam 47 and the cassette vertical cam 48 and the relationship with the link mechanism driven thereby, as explained above. In FIG. 9, the cassette horizontal/head base retraction cam 47, which is actually integrated, is shown separately as a cassette horizontal cam and a helad base retraction cam for convenience of explanation. And, as explained earlier,
These cassette horizontal cam, cassette vertical cam, and head base retraction cam rotate integrally around the same axis 45. One rotation (360°) completes one cycle of loading and unloading the cassette tape. To this end, the cassette horizontal cam and the cassette vertical cam are formed with predetermined loop-shaped cam grooves 63 and 66 eccentric to the cam rotation axis, the radius of which varies around the cam rotation axis. .

Figure 10 shows the cullet horizontal/head base retraction cam 47.
6 is a diagram showing the shape of a cam groove 63 formed in and the positional relationship between the cam groove 63 and a notch 61. FIG. Horizontal cam groove 63 is EJEC
The shape is symmetrical with respect to the line connecting the positions of T and PLAY. In the EJECT state, the center radius of the cam +1163 is set to be the largest εH.E
The radius of the cam groove 63 gradually decreases during 75 degrees from the JECT state until the cam 47 rotates clockwise and reaches point A, and at point A, the radius of the cam groove 63 becomes rpH. Then, from that state to 8 points including the PLAY point, 120@
During this period, the radius rFM of the cam groove 63 is constant. And between 756 from point 8 to EJECT, cam groove 63
The radius of the radius is gradually increased. In this way, the horizontal cam groove 63 of the cassette horizontal/head base retraction cam 47 is such that the cam groove is farthest from the cam center in the EJECT state, and conversely, the cam groove is furthest from the cam center in the PLAY state and before and after that. It is a loop-shaped groove that is eccentric to the center of the cam so that it approaches the cam center. Therefore, as the cam 47 rotates, the state of the eccentric loop-shaped groove changes, and the retaining portion of the link is guided. Note that the notch 69 is for the lock pin 55 to engage with.

FIG. 11 is a diagram showing the shape of the vertical cam groove 66 formed in the cassette vertical cam 48. The vertical cam groove 66 is also
It has a line-symmetrical shape with respect to the line connecting JECT and PLAY. Then, for a period of 150'' centered on EJECT, the center of the cam groove 66 has a radius rpv with respect to the cam center.
It is designed to have a length of . Then, the cam 48 is
Rotate clockwise from JECT, 6 from point 0 to point D
00, the radius of the cam groove 66 gradually increases from rCv to rPV. Then, PLAY from point D to point F
The radius of the cam groove 66 is rPv between 90'' centered at
During the period 606 from point R to point G, the radius of the cam groove gradually decreases from rrv to r(v. Therefore, as the cam 48 rotates, , the radius of the cam groove 66 relative to the center of the cam 48 changes, the engaging portion of the link is guided, and the link moves in a predetermined manner.

FIG. 12 is a plan view for explaining the pinch roller switching mechanism. The cassette tape recorder of this example is
Since it has an auto-reverse mechanism, the two pinch rollers are alternately switched depending on the direction of rotation of the cassette tape.

Referring to FIG. 12, a cam groove 51 is formed in the operation mode switching cam 46. As shown in FIG. One end of the longitudinal swing link 52 is rotatably supported by the post 81. A protrusion 131 is provided at the longitudinal center of the operating swing link 52.
is provided, and this protrusion 131 is a sliding pair with the cam groove 51. The other end of the operating swing link 52 is the D link 13
It is engaged with 2. D link 132 is the motion swing link 5
In response to the movement 2, a sliding movement is made in the direction of arrow 133. The other end of D link 132 engages with E link 134. E link is the bin 13 provided on the main base 32
5, and the movement of the D link 132 is controlled by the cam CH1.
Tell 36. The cam CH136 is a plate-like longitudinal member arranged parallel to the main base 32, and is held by guides 137 and 138 fixed to the main base 32, and its sliding direction is guided. Then, the cam CH136 slides in the direction of the arrow 139. Pinch rollers 141 and 142 are provided in relation to both ends of cam CH136, respectively. In other words, the pinch roller 14
1.142 is the post 14 on the main base 32, respectively.
3 and 144, and stoppers 145 and 146 respectively engage with notches 147 and 148 of the cam CH136 in a predetermined state. Then, due to the shape of the notches 147 and 148, the first
In the state shown in Fig. 2, the cam CH136 is moving in the direction of arrow 139, and the pinch roller 141 is in the operating state, and conversely, when the cam CH136 is moving in the direction of arrow 139, the pinch roller 142 is in the operating state. It is configured as follows. Such sliding motion of the cam CH136 is transmitted via the operation swing link 52, the D link 132, and the E link 134, which are swung by the rotation of the operation mode switching cam 46.

FIG. 13 is a diagram for explaining the shape of the cam groove 51 formed in the operation mode switching cam 46.

The cam groove 51 has a symmetrical shape laterally and vertically.

Then, at point L in FIG. 13, it is farthest from the center of the cam 46, and at point R, it is closest to the center. When the protrusion 131 of the operating swing link 52 is located at the L point, the left pinch roller 141 is activated, and when the protrusion 131 is located at the R point, the right pinch roller 5
142 is activated. In this manner, in this embodiment, when the operation mode switching cam 46 rotates once, the pinch rollers 141 and 142 are switched twice. Note that the four notches 71 formed symmetrically in the operation mode switching cam 46 engage with the lock bin 55.

As shown in FIG. 1, the operation mode switching cam 46 is driven at a different reduction ratio than the cassette horizontal/head base retraction cam 47 and the cassette vertical cam 48. Therefore, since it is driven by a different output gear from the cassette horizontal/head base retraction cam 47 and the cassette vertical cam 48, it can be operated when the cassette horizontal/head base retraction cam 47 is in a stopped state, and vice versa. When operating the operation mode switching cam 46, the operation of the cassette horizontal/head base retraction cam 47 can be stopped. The lock pin 55 protruding from the lock plate 56 is for this purpose. Therefore, depending on the operating state of the cassette tape recorder,
The lock plate 56 (see FIG. 1) slides up and down to selectively lock the cassette horizontal/head base retraction cam 47 or the operation mode switching cam 46 inoperable.

[Effects of the Invention] According to the present invention, by combining a planetary gear device and a cam, it is possible to provide a link drive VJ device that is small and has a small number of parts.

Further, since a plurality of link mechanisms can be driven by a link drive device driven by one motor, the link drive device can be used for multiple purposes.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the structure of a link drive device according to an embodiment of the present invention. FIG. 2 is a plan view showing a horizontal suction and discharge mechanism for a cassette tape. FIG. 3 is an exploded perspective view for explaining the coupling relationship between the cam and the link mechanism. FIG. 4 is a plan view for explaining the cassette tape vertical descent/lift mechanism. FIG. 5 is a side view for explaining the cassette tape vertical descent/lift mechanism. FIG. 6 is an enlarged perspective view of the coupling portion of the swing link. Figure 7 shows the flattening of the head base retraction cam. FIG. 8 is a partial side view of the head base retraction mechanism. Figure 9 shows the cassette horizontal/head base retraction cam 47.
FIG. 4 is a diagram showing the relationship between the rotation angle of the cassette vertical cam 48 and the link mechanism. Figure 10 shows the cassette horizontal/head base retraction cam 47.
FIG. 6 is a diagram showing the shape of a cam groove 63 in FIG. FIG. 11 is a diagram showing the shape of the cam groove 66 of the cassette vertical cam 48. FIG. 12 is a plan view showing the pinch roller switching mechanism. FIG. 13 is a diagram showing the shape of the cam groove 51 of the operation mode switching cam 46. FIG. 14 is a diagram showing an example of a cassette mounting/ejecting mechanism in a conventional cassette tape recorder. FIG. 15 is a diagram for explaining an operation mode switching mechanism in a conventional cassette tape recorder. In the figure, 31 is a power motor, 35 is a planetary gear system, 36 is an internal gear, 37 is a fixed internal gear, 38 is an AM star gear, 41 is an A carrier, 42 is a B planetary gear, 43 is a B carrier, and 44 is a cm Both gears 45 are cam posts, 46 is an operation mode switching cam, 47 is a cassette horizontal/head base retraction cam, 48 is a cassette vertical cam, 51 is a cam groove, 5
2 is an operating swing link, 54 is a locking recess, 55 is a lock pin, 56 is a lock plate, 61 is a notch, 62 is a helad base retreat link, 63 is a cam groove, 64 is a cassette horizontal swing link, 66 is a A cam groove, 68 a cassette vertical swing link, and 71 a notch.

Claims (2)

[Claims] (1) a shaft; a carrier that rotates around the shaft; a planetary gear that meshes with the carrier and rotates as the carrier rotates; a shaft that meshes with the planetary gear and rotates around the shaft by the planetary gear; a first link driving cam that is rotatably arranged around the axis, has a rotation axis of the planetary gear, and is rotated in accordance with the planetary rotation of the planetary gear. and a locking mechanism that selectively blocks rotation of the first link driving cam and the second link driving cam. (2) Both the first link driving cam and the second link driving cam have a notch on their circumferential surfaces, and the locking mechanism engages with the notch and locks the first link driving cam. The link drive device according to claim 1, which prevents rotation of the link drive cam or the second link drive cam.