JPS61280067A - Cassette loading and unloading device - Google Patents

Abstract

PURPOSE:To obtain a smooth cassette loading and unloading device by carrying out a series of operations in which a cassette is inserted horizontally, lowered vertically and loaded in a running state, and elevated vertically and discharged horizontally by the one-directional rotation of a cam. CONSTITUTION:A cassette tape 96 is inserted as shown by an arrow 106. A cassette horizontal rocking link 64 operates under the guidance of a specific looped cam groove 63 formed in the surface of a cam 47 which moves the cassette horizontally and a head base backward eccentrically with the rotational center axis of the cam 47 and a horizontal coupling link 84 rotates as shown by an arrow 111, thereby sliding a slide piece 92. A holder cassette 101 having its top surface in level with an arm EV94 is lowered to load the cassette tape 96 in a PLAY state. The cassette tape 96 is discharged by the reverse operation. In this case, the cassette tape 96 is placed in a discharge state.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to cassette tape recorders, VTR1DAT
The present invention relates to a cassette mounting/ejecting device provided in, etc.

[Prior Art] Taking a cassette tape recorder as an example, a cassette loading/unloading device includes a cam driven by a drive source,
and a linkage operated by the cam. The cam is generally formed with a cam groove that engages one end of the link mechanism and guides the one end of the link mechanism to operate the link mechanism. This cam groove is set in a groove that draws a predetermined spiral from the starting point to the ending point, with the starting point being when the cassette is in the ejected state and the ending point being in the installed state. Therefore, the cam is rotated by a certain angle in a predetermined direction for loading the cassette, and rotated by the same angle in the opposite direction for ejecting the cassette.

[Same problem to be solved by the invention] In the conventional cassette loading/unloading device, it is difficult to load/unload the cassette.
For discharge, the direction of rotation of the cam must be changed, and the direction of rotation of the motor serving as the drive source must be reversed. Therefore, frequent switching of the rotational direction shortens the life of the motor, and there are many failures due to binding or wear of the cam, etc.

Therefore, it is an object of the present invention to provide a cassette loading/unloading device that has an improved cam shape including cam grooves and operates smoothly.

[Means for solving the problem] The present invention includes a link mechanism and a cam connected to the link mechanism. The link mechanism includes a horizontal suction and discharge mechanism for the cassette, and a vertical lowering and raising mechanism for mounting the sucked cassette in a travelable state. The cam also has a horizontal link loop path for guiding the operation of the horizontal suction/discharge mechanism and a vertical link loop path for guiding the operation of the vertical descent/elevation mechanism.
The cams are formed to draw an arc of equal radius with respect to the center of rotation of the cam during the operation period so that the other mechanism does not operate while the other mechanism is in operation.

[Effect]

When the cassette is inserted, the cam rotates and the horizontal link loop path operates the horizontal suction and ejection mechanism. The cassette is then sucked in horizontally. The horizontal suction and discharge mechanism is operated by the loop-shaped path for the horizontal link, and the loop-shaped path for the vertical link is arranged to draw an arc of equal radius with respect to the center of rotation of the cam. Therefore, during this period, the vertical lowering and raising mechanism that engages the vertical link loop path does not operate. When the horizontal suction of the cassette is completed, the loop-shaped path for the horizontal link draws an arc of equal radius with respect to the rotation center of the cam. vice versa,
The radius of the vertical link loop path changes at a predetermined rate from the center of rotation of the cam. Therefore, the operation of the horizontal suction and discharge mechanism is stopped, and the vertical lowering and raising mechanism is operated instead, so that the cassette is vertically lowered and installed in a running state. When ejecting the cassette, the above operation is performed in reverse. Even in this case, since the path formed in the cam for operating each mechanism is loop-shaped, the cassette is ejected by rotating the cam in the same direction as when the cassette is installed.

[Embodiment j of the invention j Hereinafter, an embodiment of the present invention will be described by taking an auto-reverse type cassette tape recorder as an example. However, it should be pointed out in advance that the present invention is applicable not only to the cassette loading/unloading device of a cassette tape recorder but also to VTRs and DATs.

FIG. 1 is a side sectional view showing the structure of a deceleration unit for driving a cassette mounting/ejection mechanism.

The reduction unit is composed of a planetary gear device 35.

Referring to FIG. 1, a power motor 31 is fixed to a main head 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 meshes with a planetary gear device 35 and drives the planetary gear device I35.

The planetary gear device 35 includes an internal gear 36, a fixed internal gear 37, and a
M! It consists of a gear 38, an A carrier 41.8m star gear 42, a B carrier 43, and a C planetary gear 44. The internal gear 36, the A carrier 41, and the B carrier 43 are sequentially inserted into a cam post 45 fixed to the main base 32 in a stacked manner.
It is possible to rotate around. Fixed inside - car 37
is fixed to the main base 32. The internal gear 36 is connected to the pinion gear 34 and A111MfljT! 13B
The pinion gear 34 rotates around the cam post 45 when driven by the pinion gear 34. The rotational force of the internal gear 36 is transmitted to the A planetary gear 38. The A planetary gear 38 is rotatably supported by the A carrier 41, and the internal gear 36I5
and rotates while meshing with the fixed internal gear 37. Therefore, the rotational force of the internal gear 36 is AI! The speed is reduced through the gear 38 and transmitted to the A carrier 41. The gear formed on the A carrier 41 meshes with the B planetary gear 42. The B planetary gear 42 is rotatably supported by the B carrier,
It rotates while meshing with the A carrier 41 and the fixed internal gear 37. Therefore, the rotational force of the A carrier 41 is By1
It is decelerated via the 1-star gear 42 and transmitted to the B carrier 43. Furthermore, the gear formed on the B carrier 43 has C31! The star gear 44 is meshed. And this CW
! The star gear 44 controls the mode switching cam 46 to a certain predetermined speed and the cassette horizontal/head base retraction cam 4.
7 and the cassette vertical cam 48 are also driven at 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 frictional 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 pin 55 can be engaged with the locking recess 54 .

c:a! A cassette horizontal/head base retraction cam 47 including a support shaft of the gear 44 is rotated about the cam post 45 by the rotation of the cam 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 1163 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, as the cassette horizontal/head base retraction cam 47 rotates, the cassette horizontal swing link 64 performs a predetermined swing motion. Note that a roller 65 is also inserted between the cam groove 63 and the cassette horizontal 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 pin 55 can be engaged with this notch 71.

The lock pin 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 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 designed to prevent it. In this way, by moving the lock plate 56, the lock bin 55 prevents the rotation of either the operation mode switching cam 46 or the cassette horizontal/head base retraction cam 47 (t5 and the cassette vertical cam 48), and when the cassette tape is moved. The operation 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 cassette tapes. 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 mechanism 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 sliding link 64
has a substantially square or sector-shaped planar shape, and its front end is rotatably supported by a post 81 protruding from the main base 32. Cassette horizontal swing link 6
One end of 4 engages with the cam groove 63 as described above, and a 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 boss 85 that projects vertically upward from the main base 32. Holder spring 8
6 includes the arc amplification gear 83 and the horizontal connection link 84,
In FIG. 2, it is engaged with the circular amplification gear 83 and the horizontal connection link 84 so as to rotate it counterclockwise. Further, the holder blade 87 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 clockwise in FIG.

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 amplifying gear 83 is for amplifying the movement of the cassette horizontal swing link 64 and transmitting it to the horizontal connecting 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 slidably engaged with the small hole 91 in a pairwise manner.

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 (the rearmost end piece in the cassette insertion direction) of the arm EV engages with the holder cassette 101 so as to lift it up. Furthermore, an engaging protrusion (not shown) at the upper left end in FIG. 2 is engaged with the vertical link 103, as shown in FIG. 4.

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, has a post 10 projecting vertically upward from the bottom base.
It is rotatably supported by 2. The cassette vertical swing link 68 and the vertical connection link 103 are connected by a biasing spring vertical 104, so that the positional relationship between the cassette vertical swing link 68 and the vertical connection link 103 is maintained in a predetermined positional relationship, and the vertical connection link 103 is elastic. are connected to each other. 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 retaining 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 "ii" star gear device 35 explained in FIG. 1. Then, the cassette horizontal/head base retraction cam 4
guided by a predetermined loop-shaped cam groove 63 formed eccentrically with respect to the rotation center of the cam 47 on the surface of the cam 7;
The cassette horizontal swing link 64 moves, and the movement is amplified by the arc amplification gear 83 and transmitted to the horizontal connection link 84. The horizontal connecting link 84 is connected to the arrow 111 in FIG.
direction and slide the slide piece 92. As a result, the cassette tape 96 is transferred to the holder cassette 101.
taken within. After the cassette tape 96 is loaded into the holder cassette 101, the cassette vertical swing link 68 is rotated in accordance with the rotation of the cassette vertical cam 48 shown in FIG. 4, and the rotation is transmitted to the vertical connection link 103.

For this reason, the arm EV9 is connected by the vertical connection link 103.
4 rotates 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 4°7 and the cassette vertical cam 48 rotate 1806 degrees in a predetermined direction to place the cassette tape 96 in the loaded state, and further rotate 180 inches in the same direction to eject the cassette tape 96. In other words, one rotation of the cams 47 and 48 completes one cassette tape blowing and discharging operation.

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 number @47 is the 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 differs from the planar shape of the cam 47 shown in FIG. 2 is that while the cam 47 is shown from above in FIG. 2, the cam 47 in FIG. This is because, in order to explain the operation of the head base retraction mechanism, only the outer peripheral shape of the lower half of the cassette horizontal/head base retraction cam 47 is extracted and drawn. 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 laterally disposed elongate member. 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 C-link 116 is a longitudinal member arranged parallel to the C-link 116 and is rotatable around a pin 118'' set on the main base 32.The other end of the C-link 116 is provided with a protrusion 119, 119 is engaged with a head base 121. The head base 121 is a substantially T-shaped base, and is connected to the main base 32 by three guides 122, 123, and 124.
is held slidably against the head base 12
A magnetic head 125 is placed in the center of the magnetic head 1 .

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 in the state 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, the cassette horizontal/head base retraction cam 47 is in the state shown in FIG. 7 in that state. 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 the B direction of the arrow 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 rotation angles of the cassette horizontal/head base retraction cam 47 and the cassette vertical cam 48 and the positional relationship with the link mechanism driven thereby, as described 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 head 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 cassette horizontal/head base retraction cam 47.
The shape of the cam W463 formed in and the notch 61
FIG. Horizontal cam 1I63 is E
It has a shape that is line symmetrical with respect to the line connecting the positions of J E C1- and PLAY. In the EJECT state, the center radius of the cam groove 63 is set to be the largest rEll. The radius of the cam groove 63 gradually decreases during the 75° period from the EJECT state until the cam 47 rotates clockwise and reaches point A, and at point A, the radius of the cam 1163 reaches rpH.
becomes. The radius rrn of the cam groove 63 is constant during 120 degrees from that state to eight points including the PLAY point. The radius of the cam groove 63 is gradually increased in the 75'' leap from point 8 to EJECT.In this way, the horizontal cam 1163 of the cassette horizontal/head base retraction cam 47 is in the EJECT state. A loop-shaped groove eccentric to the cam center, where the cam groove is the furthest away from the cam center at times, and conversely, the cam groove is closest to the cam center during the PLAY state and before and after that. Therefore, the state of the eccentric loop-shaped groove changes according to the rotation of the cam 47, and the engagement part of the link is guided. It is something.

FIG. 11 is a diagram showing the shape of the vertical cam groove 66 formed in the cassette vertical cam 48. The vertical cam 1166 also
The shape is symmetrical with respect to the line connecting EJECT and PLAY. Then, 150° centered on EJECT
In this case, the center of the cam groove 66 has a radius of "ε" with respect to the cam center.
It is made to have a length of V. Then, the cam 48 rotates clockwise from EJECT, and the radius of the cam groove 66 gradually increases from εV to rPV during 60'' from 0 point to 0 point. PLA
Between 90' centered at Y, the 4' diameter of the cam groove 66 is r
Pv, and during the dark 60'' period from point 1 to point G, the radius of the cam groove gradually decreases from rev to rIBv. 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 pinch roller switching *si. Since the cassette tape recorder of this embodiment 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. The E-link is connected to the bin 13 provided in the main path 32.
5, and the movement of the D link 132 is controlled by the cam CH1.
Tell 36. Cam Cl-1136 has main base 32
It is a plate-shaped longitudinal member as shown 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 rollers 141 and 142 are respectively attached to the main base 32 so as to be rotatable around the posts 143 and 144.
And the stoppers 145 and 146 are respectively connected to the cam CH136.
It is adapted to engage in a predetermined state with the notches 147, 148 of. And notch 147. Due to the shape of '+48, in the state shown in FIG.
When the cam CH136 moves in the eight directions indicated by the arrow 139, the pinch roller 141 is in the operating state.Conversely, when the cam CH136 moves in the eight directions indicated by the arrow 139, the pinch roller 142 is in the operating state. Such sliding motion of the cam OH 136 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 in the operating state, and when the protrusion 131 is located at the R point, the right pinch roller 142 is in the operating state. It is being done. 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 four notches 71 formed symmetrically in the operation mode switching cam 46 engage with the lock pin 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 the output gear associated with 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. Furthermore, when operating the operation mode switching cam 46, the operation of the cassette horizontal/head base retraction cam 47 can be stopped. The locking pin 55 protruding from the locking 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, the series of operations in which the cassette is sucked in horizontally, descends vertically, is installed in a ready-to-run condition, and then ascends vertically and is ejected horizontally is performed by the cam. Because it rotates in one direction, the cassette installation and movement are smooth.
It can be a discharge device.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the structure of the speed reduction unit. 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. FIG. 7 is a plan view of the head base retraction mechanism. Figure 8 shows head base 4! !
FIG. 3 is a partial side view of the retracting mechanism. The ninth factor is a diagram showing the rotation angles of the cassette horizontal/head base retraction cam 47 and the cassette/vertical cam 48 and their positional relationship with the link mechanism. FIG. 10 is a diagram showing the shape of the cam groove 63 of the cassette horizontal/head base retraction cam 47. 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. In the figure, 47 is a cassette horizontal/l\d base retraction cam 48 is a cassette vertical cam, 61 is a notch, 62 is a head base retraction link, 63 is a cam groove, 64 is a cassette horizontal swing link, 66 is a cam groove, 68 is a cassette horizontal swing link, 84 is a horizontal connection link, 92 is a slide piece,
94 is an arm E, 96 is a cassette tape, 101 is a holder cassette, 103 is a vertical connecting link, and 105 is an engaging protrusion. Agent Masu Oiwa Yutan 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 B-←X→-A Figure 10 Mufuro! Figure 11 Figure 12 Figure 13

Claims (2)

[Claims] (1) A cassette loading/unloading device including a link mechanism for loading and unloading a cassette, and a cam connected to the link mechanism and rotating to guide the operation of the link mechanism, wherein the link mechanism is , the cam includes a horizontal suction and discharge mechanism for the cassette, and a vertical descent and rise mechanism for mounting the sucked cassette in a running state, and the cam includes a horizontal link for guiding the operation of the horizontal suction and discharge mechanism. The loop-like path and the vertical link loop-like path for guiding the movement of the vertical descent/ascent mechanism are mutually arranged so that when either mechanism is in operation, the other mechanism is not operated. During this period, the cassette loading and unloading device is formed to draw an arc with an equal radius around the cam's rotation center. (2) The cassette mounting according to claim 1, wherein the cam includes: a horizontal cam in which the loop-shaped path for the vertical link is formed; and a vertical cam in which the loop-shaped path for the vertical link is formed.・Ejection device.