JPS6323781Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary head device, and is suitable for use, for example, in a recording/reproducing device that can use two types of tape cassettes of different types.

Currently, for example, the standards for cassette video tape recorders (VTRs) are not unified, and there are various systems such as the so-called β-max (product name of Sony Corporation) and VHS (product name of Victor Company of Japan). method is adopted. Taking the β-max system and VHS system as an example, these two systems differ not only in the size and structure of the tape cassette, but also in recording and playback methods such as head drum diameter, tape feed speed, and video track angle. They are significantly different. For this reason β
Even if you try to use a VHS tape set on a Max system VTR, it won't work, and on the contrary, the VHS tape set will not work.
Beta-max type tape cassettes could not be used with VTRs using this type. Furthermore, there was no conventional VTR that could be used in common with both of these systems. In other words, in conventional VTRs, these two types were not compatible, which greatly limited the range of use and was extremely inconvenient.

Therefore, a rotary head mechanism is provided in which two drum parts each having two types of rotary heads are placed one above the other, and two types of tape cassettes of different sizes are selectively used, and the tape cassettes used are A recording/reproducing apparatus has been proposed in which the drum section is switched between upper and lower positions depending on the type of the drum. In such a recording/reproducing device, it is preferable to drive two types of drum units arranged above and below with one motor, and for this purpose, it is necessary to drive the two types of drum units accurately on the same axis. It must be easy to assemble and disassemble, taking serviceability into consideration.

The present invention has been devised to overcome the above-mentioned drawbacks, and an embodiment in which the present invention is applied to a cassette video tape recorder (VTR) will be described below with reference to the drawings.

First, the VTR of this example uses a tape cassette for the β-max (trade name of Sony Corporation) system.
It is designed to be compatible with tape cassettes for the VHS (product name of Victor Company of Japan) format. As is conventionally known, both tape cassettes for the β-max system (hereinafter simply referred to as β-use) and for the VHS system (hereinafter simply referred to as VHS-use) have two tape cassettes.
It is a reel type, with a lid rotatably attached to the front opening that can be opened and closed, and the lid is opened when it is attached to a VTR. After the cassette is installed, the tape inside the cassette is pulled out of the cassette through the front opening and loaded onto a predetermined tape running path of the VTR, and the tape is run at a predetermined speed on each tape running path to record or record the desired tape. It is configured to be regenerated.

Next, as shown in FIGS. 1A and 1B, the β tape cassette 237 and the VHS tape cassette 238 are
Explain the differences in size, shape, and function.

First, the distance _l1 between the supply reel 246 and take-up reel 247 of the VHS tape cassette 238 is larger than the distance _l2 between the supply reel 244 and take-up reel 245 of the β tape cassette 237 by a distance _l3 . However, as shown in Fig. 1A, the VHS tape cassette 238 has a width _l4 and a depth _l5 both β.
It is larger than the tape cassette 237. As shown in FIG. 1B, the heights _l6 of both tape cassettes 237 and 238 are approximately equal. Note that both tape cassettes 237 and 238
Both have a U-shaped lid 26 on the front.
8 and 269 are a pair of left and right pins 270 and 271, respectively.
These lids 26 are rotatably connected via
These front openings (not shown) are configured to be opened and closed by 8 and 269. These lids 268 and 269 are always urged to rotate clockwise in FIG. 1B by a built-in return spring (not shown) to maintain the lid closed state. Also, both tape cassettes 237, 2
A locking mechanism and a reel locking mechanism (none of which are shown) are built into the lid 38 when the lids 268, 269 are closed.

Also, each of these tape cassettes 237 and 238 has a mark, which will be described later, on the bottom of the tape cassettes 237 and 238, approximately in the center of the front side thereof.
Notches 248 and 249 are provided into which the tape pull-out pin 47 of the VTR is commonly inserted. One of the notches 248 is a large notch having a substantially trapezoidal shape, and the other notch 249 is a small notch having a substantially U-shape with one side slanted. However, when the tape cassettes 237 and 238 are aligned on their front sides and the supply reels 244 and 246 are placed on top of each other with the same axis as shown in the figure, there is a gap in the approximately center of the notch 248 of one of the tape cassettes 237 and 238 of the other. The positional relationship is such that the notches 249 overlap.

Each of these tape cassettes 237, 238 has a pair of positioning pins 108 for VTR β and VHS, which will be described later, on both left and right sides of the bottom surface.
A pair of insertion holes 250, 251 and 254, 255 into which holes 109, 118, and 119 are inserted, respectively, are provided, and their positions are different from each other.

Further, in the bottom of the β tape cassette 237, a VTR β lid and reel lock release plate 161 and a lid raising plate 253 for β and VHS, which will be described later, are inserted into the left and right ends of the front side, respectively. A pair of slit-shaped notches 252a and 252b are provided. Note that one notch 252a is the lid 268.
It is cut into part of the bottom edge of the. Further, a slit-shaped notch 256 into which the common lid raising plate 253 is inserted is provided on the bottom surface of the VHS tape cassette 238 at a position offset to one side thereof. A projection 257 for unlocking the lid is protruded from one side surface 238b of the VHS tape cassette 238 at a position biased toward the front side. or
On the bottom of the VHS tape cassette 238, there are two tapes on the front and back in the center of the VHS tape cassette 238.
A pair of insertion holes 2 into which an end sensor light source 125 and a reel lock release pin 126 are inserted, respectively.
58,259 are provided.

As described above, both tape cassettes 237, 2
38 are different in size, shape and function. As described later, these tape cassettes 2
When 37,238 is selectively attached to the VTR,
The positioning of these, the unlocking of these lids 268, 269, the unlocking of these reels, etc. are performed by dedicated members, respectively. Note that these lids 26
8,269 is opened by a shared lid raising plate 253. In addition, VHS tape cassette 238
is inserted into the cassette from the bottom of the end sensor light source 125.

Next, the configuration of the VTR according to this embodiment will be explained.

First, the configuration of the tape loading mechanism will be explained with reference to FIG.

In the VTR of this embodiment, a lifting platform 1 is arranged on the side opposite to the cassette mounting position. This lifting platform 1
is supported to be movable up and down relative to the main chassis 3 as will be described later, and the drum assembly 2
is installed on this lifting platform 1. As shown in Figure 9, this drum assembly 2 has a two-stage drum structure, upper and lower.
There is a drum part 2b for β on the lower side.
are arranged respectively. Further, a loading ring 4 is arranged around the outer circumference of the drum assembly 2 in a slightly eccentric state, and this ring 4 is approximately
Three guide rollers 5 arranged at equal intervals of 120°,
It is rotatably supported by the main chassis 3 by 6 and 7. At this time, the ring 4 is supported at a slight inclination (approximately 9.58' with respect to the tape cassette) so that it is at its lowest near the guide roller 5. The loading ring 4 is rotatably driven by a motor (not shown) via a pinion 8 attached to the main chassis 3.

Also shown on the loading ring 4 are four tape guides 10, 11, 12, and 13, each consisting of a pinch roller 9 and a rotating roller, perpendicular to the loading ring 4 (that is, at an angle with respect to the tape cassette). They are arranged and installed as follows. The pinch roller 9 is rotatably supported on a pinch roller lever 15 which is rotatably attached via a pin 14. 2) is biased counterclockwise in FIG. In the tape unloading state, the pinch roller lever 15 is brought into contact with the guide pin 10 and its rotation is restricted. Further, a guide portion 243 is attached to the back of the pinch roller 9 on the pinch roller lever 15.

Further, a recess 16 is formed in a part of the outer peripheral surface of the loading ring 4, as shown in FIG. ing.

On the other hand, as clearly shown in FIG. 26, a groove 17 is formed on the back side of the loading ring 4, and a roller 70 pivotally attached to a rotating arm 68, which will be described later, is fitted into this groove 17. There is. These recesses 16 and grooves 17 each constitute a cam mechanism. That is, when the loading ring 4 rotates counterclockwise in FIG.
7 is guided by the wall 16' on the outlet side of the recess 16 and moves, thereby causing the rotating arm 66 to rotate counterclockwise in the figure. One side groove 17
is formed in a substantially spiral shape, and when the loading ring 4 rotates clockwise in the figure (Figure 26 shows a bottom view, the rotation direction of the ring 4 is opposite to that in Figure 2), The roller 70 is first guided by the inner peripheral surface 4' of the loading ring 4 and moves from point Q to S.
point (at this time, the rotating arm 68 does not rotate), and is guided by the inner peripheral surface 4' of the groove 17.
2, the pivot arm 68 pivots counterclockwise in FIG. 2 when moving from point S to point T. Furthermore, two protrusions 265 and 266 are integrally provided on the back side of the loading ring 4, and these protrusions 265 and 266 are integrally provided on an arm portion 68' of a rotating arm 68, which will be described later. By selectively coming into contact with the protrusion 267, rotation of the loading ring 4 in the counterclockwise and clockwise directions in FIG. 26 is restricted.

Also, on the lifting platform 1, inside the loading ring 4, there is an erase bed 18 for β, and an audio head/control head (hereinafter referred to as "AC head") 1.
9. Five guide pins 20, 21, 22, 23,
24 are arranged as shown in FIG. 2 to form a tape path for a predetermined β. On the other hand, a VHS erasing head 25, an AC head 26, and two guide pins 27, 28 are arranged as shown in FIG. 2 to form a predetermined VHS tape path. At that time, an erase head 25 for VHS, an AC head 26,
The guide pins 27 and 28 are the drum part 2 for VHS.
Corresponding to a, it is provided at a higher position than those for β. Therefore, as will be described later, the tape path for VHS is formed inside the tape path for β, and at a higher position with respect to the elevator platform 1. By moving the elevator platform 1 up and down, it is possible to select one of these two tape paths. That is, when the β tape cassette 237 is installed, the lifting platform 1
is at an upper position (hereinafter referred to as the "β position") with respect to the main chassis 3, and the tape pulled out from the tape cassette 237 is pulled out by the tape guide 10 of the loading ring 4, as described later, and the tape is pulled out by the guide pin 20 for β, Erase head 18, guide pin 2
1. Drum part 2b, guide pins 22, 23, AC
The tape is loaded onto a predetermined β tape path formed by the head 19, guide pin 24, and the like.
On the other hand, when the VHS tape cassette 238 is installed, the elevator platform 1 is lowered to the lower position (hereinafter referred to as the "VHS position") as described later, so that the aforementioned β guide pins 20 to 24 and the erasing head 1
8. The drum part 2b and the AC head 19 drop down. Therefore, the tape pulled out from the VHS tape cassette 238 mounted at the same height as the β cassette and also pulled out by the tape guide 10 of the loading ring 4 does not come into contact with them, but this time. VHS that has been lowered to the specified position
The tape is loaded onto a predetermined VHS tape path formed by a VHS guide pin 27, an erasing head 25, a drum section 2a, an AC head 26, a guide pin 28, and the like.

The VHS tape path further includes two guide pins 29 and 30, and so-called triangular guides 31 and 32 that are composed of a pair of inclined pins.
They are arranged on the inlet side and the outlet side of the VHS drum section 2a, respectively. And these triangular guides 3
1, 32 and guide pins 29, 30 are attached to the drum assembly 2 or its drum support member 184. Furthermore, those triangular guides 31 and 32
is for correcting the winding angle of the tape around the drum portion 2a. Specifically, the inclination of the drum assembly 2 according to this embodiment is adjusted to a normal β video track angle of about 5°00' (when stopped), while the VHS video track angle (when stopped) is about 5°.゜56′74″.Then, the angle difference is
56'74'' is corrected by the triangular guides 31 and 32. In other words, the VHS tape drawn out in the same plane as the β tape is corrected by the triangular guide 31 on the entrance side. Accordingly, the angular difference 56'74'' is corrected and the tape is wound around the drum portion 2a. After recording or reproduction is performed, the angle is returned to approximately the original angle by the triangular guide 32 on the exit side. For this reason, 3
The configurations of the corner guides 31 and 32 are almost reversed. And a triangular guide 3 like this
1 and 32, the loading ring 4, tape pull-out mechanism, etc. can be used in common for both tape paths.

Further, a capstan 33 is arranged on the elevator platform 1 inside the loading ring 4. On the other hand, a pinch roller pressure lever 35 operated by a plunger 34 is located at a position facing the capstan 33 across the loading ring 4 from the main chassis 3.
installed on. When tape loading is completed as will be described later, the pinch roller 9 is pressed against the capstan 33 via the tape by the pinch roller pressure lever 35, thereby causing the tape to run. On the other hand, the capstan 33 is driven by a motor (not shown) provided on the lifting platform 1, and changes the tape speed (for β: approximately 20.00 mm/s, for VHS: approximately 33.35 mm/s).
This is done by electrically switching the rotational speed of the motor. Also, the capstan 33 is the lifting platform 1
Move up and down with the above-mentioned β and VHS
It is now commonly used for both tape passes.

Further, an end sensor 36 on the tape supply side for the β tape cassette 237 is provided on the lifting table 1. This end sensor 36 is at a predetermined position for detecting the tape with respect to the β tape cassette 237, as in the conventional case, except when the VHS tape cassette 238 is inserted, that is, when the elevator platform 1 is in the β position. On the other hand, when the VHS tape cassette 238 is inserted, it lowers together with the elevator platform 1, and
Care has been taken to ensure that it does not interfere with the VHS tape path. The end sensor 37 on the tape winding side for the β tape cassette 237 is mounted at a predetermined position on the main chassis 3 so as not to obstruct the VHS tape path.

In addition, the lifting platform 1 is supported at the same inclination as the loading ring 4, as will be described later.
AC head 19, 26, guide pins 22 to 24,
The capstans 28, 30 and 33 are provided perpendicularly to the lifting platform 1, that is, at the same inclination as the loading ring 4. On the other hand, the erase head 18,
25, guide pins 20, 21, 27, 29, and end sensor 36 are provided perpendicularly to the tape cassette.

Two switches 38 and 39 are mounted on the main chassis 3 around the outer periphery of the loading ring 4, respectively. Further, a recess 40 is provided in a part of the inner peripheral surface of the loading ring 4. Rollers 43 and 44 pivotally attached to the ends of the switch operating levers 41 and 42 selectively fit into the recesses 40, whereby the switch operating levers 41 and 42 rotate and the switches 38 and 39 are rotated. The controls are pressed respectively. The purpose of these switches 38 and 39 will be described later.

Next, the structure of the tape pulling mechanism from the tape cassette will be explained with reference to FIG.

First, the fixed shaft 6 provided on the main chassis 3
A rotating member 64 is rotatably attached to 3. A roller 67 is disposed at the top end of this rotating member 64.
The rotary arm 66 is pivotally mounted. Note that in the initial state when the cassette is installed, the roller 67 is inserted into the recess 16 provided in the loading ring 4 as shown in FIG. 2, and as the loading ring 4 rotates. The loading ring 4 is guided by the outer circumferential surface of the loading ring 4 and is relatively movable. As described above, the rotating member 64 rotates counterclockwise in FIG. 2 when the roller 67 exits the recess 16. The rotating member 64 is connected to the interlocking rod 6 by a pin 65.
1, and the rotational movement of the rotating member 64 is converted into a reciprocating movement of the interlocking rod 61.

A rotating arm 68 bent to have a substantially U-shaped cross section is rotatably attached to the fixed shaft 63. This rotating arm 68 is integrally provided with an arm portion 68' having a roller 70 pivotally attached to its tip, and a protrusion 267 for regulating the rotation of the loading ring 4 is provided on the arm portion 68'. It is integrated. Note that in the initial state, the roller 70 is connected to the loading ring 4 as shown in FIG.
Loading ring 4
As it rotates, it is guided by its inner peripheral surface and moves relatively. As described above, when this roller 70 is introduced into the groove 17 of the loading ring 4, the rotating arm 68 rotates counterclockwise in FIG. When the rotating arm 68 rotates as described above, the protrusion 64' provided on the side surface of the rotating member 64 comes into contact with the wall 68'' of the rotating arm 68, thereby causing the rotation of the rotating arm 68. return movement of the member 64;
That is, as shown in FIG. 2, clockwise rotation is restricted. The pivot arm 68 is also connected to another interlocking rod 58 via a pin 69. Note that the interlocking rods 58 and 61 are connected to each other by a coil spring 71.

An elongated hole 59 is provided at the other end of the interlocking rod 58, and a pin 57 of a rotating arm 55 bent into a substantially U-shape is inserted into this elongated hole 59.
Note that this rotating arm 55 is rotatably attached to a fixed shaft 53 provided on the main chassis 3. Further, this rotating arm 55 is biased clockwise by a coil spring 56 whose one end is fixed to the main chassis 3. Another rotating member 60 is also rotatably attached to the fixed shaft 53, and this rotating member 60 is connected to the other interlocking rod 6 via a pin 89.
1. A substantially L-shaped rotating arm 51 is also rotatably attached to the fixed shaft 53. This rotating arm 51 is urged counterclockwise by a coil spring 54 whose one end is fixed to the main chassis 3.

A pin 62 is provided on the lower surface of this rotating arm 51. This pin 62 is formed to extend between the aforementioned rotating arm 55 and rotating member 60, and when this pin 62 is locked to one rotating arm 55, the rotating arm 51 is rotated counterclockwise. Rotation in the direction is now restricted. Further, when one of the interlocking rods 61 moves to the left in the figure due to the counterclockwise rotation of the rotating member 64 described above, the rotating member 60 connected to the interlocking rod 61 rotates counterclockwise. The rotating member 60 pushes the pin 62 to simultaneously rotate the rotating arm 51 and the rotating arm 55 counterclockwise. When the other interlocking rod 58 moves upward due to the counterclockwise rotation of the rotation arm 68, the rotation arm 55 is further rotated counterclockwise via the pin 57. At this time, the rotating arm 51 that is locked to the rotating arm 55 also rotates further in the counterclockwise direction due to the biasing force of the coil spring 54.

Further, the rotating arm 51 is connected to the U-shaped member 46 via a pin 52. The U-shaped member 46 is connected to a rotating member 49 via a pin 50, and this rotating member 49 is rotatably attached to a fixed shaft 48 provided on the main chassis 3. The other end of the U-shaped member 46 has a tape pull-out pin 4 at its tip.
A tension regulator arm 45 (hereinafter simply referred to as a "tension regulator arm") 45 provided with a tension regulator arm 7 is attached.

Further, a switch 73 is provided on the lower side of the main chassis 3 as shown in FIGS. 24 and 25, and the operator of the switch 73 is pressed by a switch operating lever 74 whose one end is connected to the interlocking rod 58. It is becoming more and more common.

Next, the configuration of the reel stand mechanism will be explained with reference to FIGS. 2, 6, and 7.

First, as shown in FIG. 2, a supply reel stand 75 and a take-up reel stand 76 are respectively arranged at the cassette mounting position. The supply reel stand 75 is the main chassis 3
It is rotatably attached to a rotation shaft 80 provided above, and a supply reel shaft 79 is integrally provided at the upper end of the supply reel stand 75.

On the other hand, the take-up reel stand 76 includes a lower reel stand 81 rotatably mounted on the main chassis 3, and an upper reel stand 8 on which a take-up reel shaft 85 is integrally provided.
4. And lower reel stand 81
As shown in FIGS. 6 and 7, a gear 82 is integrally provided. On the other hand, a toothed portion 84' is provided on the outer circumferential surface of the upper reel stand 84, and the lower reel stand 81 and the upper reel stand 84 mesh with each other via a gear 83 to interlock with each other. Note that the gear 83 is a fixed shaft 8 provided on the main chassis 3.
7 is rotatably attached.

Further, the upper reel stand 84 is rotatably attached to a support member 86, and this support member 86 is fixed onto a rotating plate 88 rotatably supported by the fixed shaft 87. Further, a pin 90 is provided on the support member 86, and this pin 90 is inserted into a long hole 92 of a substantially L-shaped arm 91 attached to the sliding plate 100.
is inserted into. The upper reel stand 84 is in the β position indicated by a solid line in FIG. 2, that is, in the state shown in FIG. 6, except when a VHS tape cassette 238 is inserted into a cassette holder 133, which will be described later. or
When the VHS tape cassette 238 is inserted,
As will be described later, the sliding plate 100 slides to the right in FIG. 2, and accordingly, the L-shaped arm 91 also moves in parallel to the right. Therefore, the support member 86 connected to the L-shaped arm 91 via the pin 90 rotates as shown by the chain line in FIG. As a result, the upper reel stand 84 is located at the above-mentioned distance l ₃ from the β position.
It moves to the position shown in FIG. 7. Since the movement of the upper reel stand 84 is a rotational movement about the fixed shaft 87, the upper reel stand 84 and the gear 83 do not become disengaged during this movement. Therefore, the upper reel stand 84 can be driven via the gear 83 in both the β position and the VHS position.

Further, as shown by the imaginary line in FIG. 2, a mechanical pulley 93 is arranged below the main chassis 3. A driving force is transmitted to this mechanical pulley 93 from a motor section 281 of the drum assembly 2, as will be described later. The driving force from the mechanical pulley 93 is transferred to an idler 95 from a roller 94 provided coaxially with the mechanical pulley 93.
It is designed to be transmitted to the supply reel stand 75 via. Further, the driving force from the mechanical pulley 93 is also supplied to the take-up reel table 76 via a pulley 96, a belt 97, a pulley 98, a roller 99, etc. The idler 95 is supported by a support plate operated by a mode setting plunger (not shown), and moves in the direction of arrow A in FIG. This allows the driving force to be transmitted. On the other hand, the roller 99 is supported by a rotating arm (not shown) operated by a plunger for setting another mode, and is pressed against the lower reel stand 81 of the take-up reel stand 76 in the FF and FWD modes. ing. Also, take-up reel stand 7
The driving force transmitted to the lower reel stand 81 of No. 6 is transmitted to the upper reel stand 84 via the gears 82 and 83 described above. In addition, in FWD mode (not shown),
As is well known, a predetermined brake is applied to the lower reel stand 81 of the take-up reel stand 76. The tape speed at this time is adjusted by the rotational speed of the capstor 33 mentioned above.

Next, the configuration of the cassette positioning mechanism will be explained with reference to FIGS. 2, 4, and 5.

First, as shown in FIG. 2, a sliding plate 100 is disposed horizontally between the reel stands 75, 76 and the loading ring 4. This sliding plate 100 is supported by a pair of left and right fixed shafts 101 and 102 provided on the main chassis 3, as shown in FIGS. 4 and 5. At that time, the fixed shafts 101 and 102 are
The sliding plate 10 is inserted into slots formed in the heads 101' and 102' of the fixed shafts 101 and 102, respectively.
The edges of the long holes 103 and 104 of 0 are fitted and supported. As a result, the sliding plate 100
can be slid in the left and right direction in Figure 2. Further, the sliding plate 100 is biased toward the left in FIG. 2 by a coil spring 105 whose one end is fixed to the main chassis 3.

Further, the sliding plate 100 is bent into a substantially L-shaped cross section as shown in FIGS. 4 and 5.
As shown in the figure, a pair of left and right inclined guide grooves 106 and 107 for β with varying heights are formed at both ends of the vertical wall portion 100'. On the other hand, a pair of left and right positioning pins 108, 10 for β are provided at positions facing both the inclined guide grooves 106, 107.
9 are arranged respectively, and these two pins 108, 1
Projections 110 and 111 provided at 09 are inserted into both the above-mentioned inclined guide grooves 106 and 107, respectively. Also, both positioning pins 108 and 109 are connected to a pair of height regulating tubes 11 provided on the main chassis 3.
2,113 so as to be movable up and down. Furthermore, a pair of plate members 114 and 115 bent into a substantially L-shape are attached to the sliding plate 100, and vertical wall portions 114' and 115' of both plate members 114 and 115 are also attached at both ends. A pair of inclined guide grooves 116 for VHS with varying heights,
117 are formed respectively. Further, a pair of positioning pins 118 and 119 for VHS are arranged at positions facing both of these inclined guide grooves 116 and 117, respectively, and protrusions 120 and 121 provided on both of these pins 118 and 119 are arranged in positions facing both of these inclined guide grooves 116 and 117, respectively. Groove 1
16 and 117, respectively. Further, both positioning pins 118 and 119 are supported within a pair of height regulating cylinders 122 and 123 provided on the main chassis 3 so as to be vertically movable. Note that each pair of inclined guide grooves 106, 107 and 116, 11
7 is formed so that the structure of the height change is exactly opposite to each other, so that both positioning pins 108, 109 for β and both positioning pins 118, 119 for VHS are alternately connected. It is designed to move up and down. That is, when the sliding plate 100 is in the β position shown in FIG. 2 or FIG.
6', 107', so both these pins 108,
109 is rising. On the other hand, at this time, the protrusions 120, 12 of both positioning pins 118, 119 for VHS
1 is the lower part 1 of both inclined guide grooves 116, 117
16″, 117″, these both pins 118,
119 is declining. When a VHS tape cassette 238 is inserted into a cassette holder 133, which will be described later, the sliding plate 100 slides to the right in FIG. 2 and moves to the VHS position shown in FIG. At this time, the protrusions 110, 111 of both positioning pins 108, 109 for β are connected to both inclined guide grooves 106, 109.
7 and move to the lower parts 106'', 107'', these pins 108, 109 descend, and conversely, both VHS positioning pins 118, 11
The protrusions 120 and 121 of 9 are both inclined guide grooves 11.
6 and 117, both pins 118 and 119 rise. Note that both of these positioning pins 108, 109 and 118,
Reference numeral 119 denotes the aforementioned β tape cassette 23.
7 and both insertion holes 254 and 255 of the VHS tape cassette 238, respectively. Furthermore, the second
Both reel stands 7 are placed on the chassis 3 as shown in the figure.
A pair of left and right height regulating pins 273, 274 are provided at positions on the front side of 5, 76. As will be described later, both tape cassettes 237 and 238
When installed in a VTR, these cassettes 237,
238 is the height regulating cylinder 112, 113, 122, 1
23 and height regulating pins 273, 274 to be horizontally supported at a predetermined height.

Further, as shown in FIGS. 2, 4, and 5, a rotating shaft 124 is disposed horizontally extending between the supply reel stand 75 and the take-up reel stand 76. This rotation shaft 124 is rotatably supported by a pair of support members 275 and 276 provided on the main chassis 3. The rotating shaft 124 has an end sensor light source 1 for the VHS tape cassette 238.
25 and a reel lock release pin 126 are fixed respectively. The end sensor light source 125 is provided with a protrusion 127 as clearly shown in FIG. 2, and this protrusion 127 fits into a recess 128 formed in the sliding plate 100. Therefore, the end sensor light source 125 rotates as the sliding plate 100 slides, and at the same time, the reel lock release pin 126 also rotates via the rotating shaft 124. That is, the end sensor light source 125 and the reel lock release pin 126 are
When the sliding plate 100 is in the β position, it is in a horizontal state as shown in FIG. 4, so that it does not interfere with the β tape cassette 237.
On the other hand, when the VHS tape cassette 238 is inserted and the sliding plate 100 moves to the VHS position as shown in FIG. 5, the end sensor light source 125 rotates 90 degrees about the rotation axis 124 together with the rotation axis 124, and becomes vertical as shown in FIG. At the same time, the reel lock release pin 126 fixed to the rotating shaft 124 is also rotated 90 degrees, and is also in the vertical position as shown in the figure. By the way, when the VHS tape cassette 238 is installed in the state shown in FIG. 259. The end sensor for the VHS tape cassette 238 includes the end sensor light source 125 inserted into the cassette 238 from the insertion hole 258 as described above, and the light source 125.
Both left and right sides 238 of the cassette 238
It is constituted by a pair of light receiving elements (none of which are shown) that receive light through light transmitting holes provided in portions a and 238b.

Further, the above-mentioned lid raising plate 253 is attached to the sliding plate 100. This lid lifting plate 253 is for opening the lids 268, 269 of each tape cassette 237, 238. When the lid 268 of the β tape cassette 237 is in the β position shown in FIGS.
At the position 52b, the tape cassette 237 comes into contact with the lid raising plate 253, is pushed up relatively by the downward movement of the tape cassette 237, and is released by being rotated counterclockwise in FIG. 1B. Also, the lid 269 of the VHS tape cassette 238 has the notch 25 when the lid raising plate 253 is in the VHS position shown in FIG.
The tape cassette 238 is brought into contact with the lid raising plate 253 at position 6, and released in the same manner as the tape cassette 238 is lowered.

The sliding plate 100 also has a cassette holder 1, which will be described later.
33 positioning pins 129 are provided,
The cassette holder 133 is positioned by selectively inserting this pin 129 into a pair of positioning holes 77 and 78 provided in the cassette holder 133. Also sliding plate 100
As shown in the figure, a plate member 131 having a long hole 132 is attached to one end of the plate member 131, and a rotation pin 134 of the cassette holder 13 is inserted into the long hole 132. As will be described later, this rotating pin 134 rotates in the direction of arrow B in FIG. 2, and this rotating force moves the sliding plate 100 between the β position and the VHS position.

Further, a detection switch 130 is provided at the other end of the sliding plate 100 between it and the main chassis 3, and this detection switch 130 detects the position of the sliding plate 100 and detects the electrical mechanism of the VTR (for example, Capstan 33, a lifting mechanism for the lifting platform 1, which will be described later.
(including tape speed switching, etc.) for β and
It is configured so that it can be switched between VHS and VHS.

Next, the structure of the cassette holder 133 will be explained with reference to FIGS. 8, 15A, and 15B.

First, as is conventionally known, the cassette holder 133 is supported in a vertically movable manner at the cassette mounting position. The cassette holder 133 is normally moved back to the raised position, and is operated to mount the tape cassette at the cassette loading position by being pushed down after the tape cassette is inserted. Note that the cassette holder 133 is locked in the lowered position, and after the unloading of the tape is completed, the lock is released and the cassette holder 133 is moved back to the original raised position.

Next, the aforementioned β tape cassette 237 and VHS tape cassette 238 are selectively inserted into the cassette holder 133. And the bottom plate 13 of this cassette holder 133
5 is formed with openings 136 and 137 through which the aforementioned supply reel shaft 79 and take-up reel shaft 85 are inserted, respectively. Note that since the upper reel stand 84 of the take-up reel stand 76 is designed to move between the β position and the VHS position as described above, the take-up reel axis 85
The opening 137 through which it is inserted is formed into a long hole as shown in the figure.

A pair of fulcrum shafts 138 and 139 are provided on the left and right sides of the cassette insertion side of the bottom plate 135, respectively, and a pair of rotating members 140 and 141 are rotatably attached to the upper ends of these fulcrum shafts 138 and 139, respectively. installed on. And these two rotating members 14
Both tape cassettes 23 are on the bottom surface of the tip of 0.141.
A pair of positioning rollers 147 and 148 are rotatably attached via pins 150a and 150b, respectively, for positioning 7 and 238 at predetermined positions. Further, both of these rotating members 140 and 141 are connected to each other by a connecting rod 142. At this time, one end of the connecting rod 142 is connected to the distal end side of one rotating member 140 via a pin 143, and the other end extends from the fulcrum shaft 139 of the other rotating member 141 to the side opposite to the positioning roller 148. It is connected to the other protruding end via a pin 144. Therefore, both rotating members 140 and 141 are connected to each other by this connecting rod 142 and are configured to be rotated about fulcrum shafts 138 and 139, respectively. Furthermore, as shown in FIG. 15A, there is a difference in length between the distance l ₁₀ between the fulcrum shaft 138 and the pin 143 and the distance l ₁₁ between the fulcrum shaft 139 and the pin 144 as shown in the figure. I have it. Therefore, one rotating member 14
0 rotates counterclockwise in the figure by an angle _θ1 , and one of the positioning rollers 147 moves by a distance _l12 from the β position shown by the solid line in the figure to the VHS position shown by the chain line. The other rotating member 141 is configured to rotate clockwise in the figure by an angle θ ₂ and the other positioning roller 148 moves by a distance l ₁₃ from the β position shown by the solid line in the figure to the VHS position shown by the chain line. has been done.

Then, as described later, both positioning rollers 14
7 and 148 are always energized to move from the VHS position to the β position by a spring force, and are regulated in position at the β position.

Therefore, according to this cassette holder 133, the β tape cassette 2 can be held as shown by the solid line in FIG. 15A.
37 is inserted, the tape cassette 237 is positioned at the position shown in the figure by sandwiching the left and right sides 237a, 237b of the tape cassette 237 from both sides by the positioning rollers 147, 148 at the β position. do. On the other hand, the 15th
VHS tape cassette 2 as shown by the chain line in Figure A
38 is inserted, the tape cassette 2
38, its left and right sides 238a, 2
Both positioning rollers 147, 148 by 38b
is moved from the β position to the VHS position against the spring force, positioning the tape cassette 238 in the position shown. In this case, both positioning rollers 14
By setting the moving distances of 7 and 148 to _l12 and _l13 , respectively, the VHS tape cassette 238
is positioned such that the axis of its supply reel 246 overlaps the axis of the supply reel 244 of the β tape cassette 237. Note that a pair of guide plates 145 are provided on both rotating members 140 and 141 to smoothly guide the insertion of both tape cassettes 237 and 238 into the cassette holder 133.
146 are integrally provided.

A rotating arm 149 is rotatably attached to the lower end of the other fulcrum shaft 139 under the bottom plate 135. This rotating arm 149 is inserted into the other rotating member 1 through an opening 236 provided in the bottom plate 135.
41 and is connected to the lower end of the pin 150b. A rotary lever 151 is rotatably attached to the lower end of the fulcrum shaft 139 on the lower side of the rotary arm 149, and the aforementioned rotary pin 134 is provided on the lower surface of the tip of the rotary lever 151. As described above, this pivot pin 134 is inserted into the elongated hole 132 of the plate member 131 attached to the sliding plate 100, and the rotation of this pivot pin 134 causes the sliding plate 10 to move.
0 is designed to slide. In addition, rotation pin 1
34 has a sufficient length so that the cassette holder 133 does not come out of the elongated hole 132 when the cassette holder 133 is moved up and down. In addition, since the cassette holder 133 also moves in the front and rear directions when going up and down, the rotation pin 1 at that time
34 and the sliding plate 100, the rotating pin 134 is attached to the cassette holder 133.
It is installed at a slight angle in the direction of movement.

Further, the rotating lever 151 and the rotating arm 149 are connected to each other by a coil spring 152. Further, a pin 153 is provided on the upper surface of the rotating lever 151, and this pin 153 is brought into contact with the rotating arm 149, so that the rotating lever 151 rotates clockwise in FIG. 8 relative to the rotating arm 149. is becoming relatively regulated.

Therefore, according to this cassette holder 133, the sliding plate 100 is slid and positioned by the coil spring 105 to the β position shown in FIG. The rotating lever 151 is regulated to the position shown by the dotted line in FIG. 15A via the rotating pin 134. The rotating arm 149, which is urged to rotate counterclockwise in FIG. 15A by the coil spring 152, comes into contact with the pin 153 and is regulated. Based on the above regulations, both positioning rollers 147 and 148 are
It is regulated to the β position shown by the solid line in Figure 5A. On the other hand, a VHS tape cassette 238 is inserted into this cassette holder 133,
As described above, when both positioning rollers 147 and 148 are moved to the VHS position shown by the chain line in FIG. 15A, the rotating arm 149 is rotated clockwise in FIG. 15A. Then, the rotating lever 151 is rotated clockwise in FIG. 15A by the rotating arm 149 against the spring force of the coil spring 152, and the sliding plate 100 resists the coil spring 105 and the second
It is designed to be slid to the VHS position on the right side in the diagram. However, the coil spring 152 is the coil spring 105.
Constructed with a stronger spring. At this time, the rotating arm 149 is integrally connected to the rotating member 141.
Although the rotation lever 151 is rotated by a relatively large angle θ ₂ to the position shown by the chain line in Figure A, the rotation lever 151 is rotated at the first position in relation to regulating the position of the sliding plate 100 at the VHS position.
It is rotated only a small angle to the position shown in dashed lines in Figure 5A. Therefore, the rotating arm 14 at this time
The coil spring 152 will expand in accordance with the difference in angle between the rotation lever 9 and the rotation lever 151.

Next, the switching mechanism of the stopper for regulating the insertion amount of both tape cassettes 237 and 238 which are selectively inserted into the cassette holder 133 will be explained with reference to FIGS. 8, 15A and 15B.

First, the rotary plate 1 is placed under the bottom plate 135 of the cassette holder 133 at a position biased toward the front side of the tape cassette to be inserted into the cassette holder 133.
54 are arranged. This rotating plate 154 is connected to the cassette holder 1 by means of a pair of left and right pins 155 and 156.
It is rotatably attached to left and right side wall portions 157, 158 of 33. A pair of left and right stoppers 159 and 160 for regulating the insertion amount of the β tape cassette 237 are integrally provided on the front edge of the rotating plate 154. Furthermore, one stopper 1
A lid lock release plate 161 for β is also provided integrally with this rotating plate 154 on one side of the rotating plate 154. On the other hand, a pair of left and right stoppers 162, 163 regulate the insertion amount of the VHS tape cassette 238.
is integrally provided on the front edge of the bottom plate 135 of the cassette holder 133. A leaf spring 164 is attached to the side wall 158 for unlocking the VHS cassette lid. And the rotating plate 1
54 is rotated counterclockwise in FIG. 15B by a coil spring 264 whose one end is fixed to the side wall portion 158, and is regulated horizontally by coming into contact with the lower surface of the bottom plate 135. Further, a projection 165 having an inclined surface 165' is provided on a part of the rotating plate 154, and this projection 165 is inserted through an opening 166 provided in the bottom plate 154 and projected above the bottom plate 135. There is.

Therefore, according to this cassette holder 133, the rotating plate 154 is normally held in a horizontal operating position as shown by the solid line in FIG. 15B, and when the β tape cassette 237 is inserted into this cassette holder 133, The insertion amount of the tape cassette 237 is regulated by both stoppers 159 and 160 for β, and the tape cassette 237 is positioned at the position shown by the solid line in FIG. 15A. That is, at this time β
The lower end of the front side of the tape cassette 237 comes into contact with both stoppers 159, 160 and stops. Note that with the insertion of the cassette at this time, the lid lock release plate 161 for β is inserted into the tape cassette 237 through the notch 252a, and this tape cassette 2
37's lid 268 and the reel are unlocked at the same time.

On the other hand, when a VHS tape cassette 238 is inserted into this cassette holder 133, the amount of insertion of this tape cassette 238 is regulated by both VHS stoppers 162, 163, and the tape cassette 238 is inserted as shown in chain lines in FIG. 15A. Position it in the position shown. That is, at this time, the tape cassette 238 to be inserted comes into contact with the inclined surface 165' of the protrusion 165, is guided by the inclined surface 165', and as the cassette is inserted, the protrusion 165 is pushed down. As a result, the rotating plate 154 is rotated clockwise against the coil spring 264 as shown by the chain line in FIG.
60 and the lid lock release plate 161 are moved to a non-operating position below the bottom plate 135 so as not to obstruct the insertion of the VHS tape cassette 238. Therefore, at this time, the VHS tape cassette 238 is not brought into contact with both stoppers 159 and 160 for β.
The amount of insertion is regulated by coming into contact with both stoppers 162 for VHS. As the cassette is inserted at this time, the leaf spring 164 comes into contact with the protrusion 257 protruding from the side surface 238b of the VHS tape cassette 238, and pushes the protrusion 257 into the cassette. This unlocks the lid 269 of the VHS tape cassette 238.
When the VHS tape cassette 238 is pulled out of the cassette holder 133, the rotary plate 154 is rotated back to its original horizontal operating position by the coil spring 264.

As shown in FIGS. 8 and 15A, a projection 2 is provided on a part of the lower surface of the bottom plate 135 of the cassette holder 133.
77, and this protrusion 277 is provided with a pair of left and right pin insertion holes 77, 78.
Then, when the cassette holder 133 is lowered to the cassette mounting position, the positioning pin 129 provided on the sliding plate 100 described above moves the sliding plate 100.
Both pin insertion holes 77, 7 according to the movement position of 0
The cassette holder 133 is selectively inserted into either one of the cassette holders 8 and 8 to position the cassette holder 133. At this time, if the sliding plate 100 is in the β position shown in FIG.
29 is inserted into one pin insertion hole 77, and sliding plate 100
is in the VHS position shown in FIG. 5, the positioning pins 129 are inserted into the other pin insertion holes 78, respectively.

Note that this cassette holder 133 is designed to fly out from the VTR body when in the EJECT mode, as in conventional models;
3. A conventionally known structure may be used for the elevating mechanism.

Next, the structure of the drum assembly 2 will be explained with reference to FIGS. 9 and 10.

First, the drum assembly 2 is a drum part 2b for β.
The drum section 2a for VHS is stacked on the upper side, so that it has a so-called upper and lower two-stage drum structure. The drum part 2b for β is the lower fixed drum 167.
It has a three-layer drum structure consisting of an upper fixed drum 168 and a rotating drum 169 placed in the middle, and these three drums 167, 16
8 and 169 have the same diameter. or
The drum section 2a for VHS has two layers: a fixed drum 170 integrally molded on the upper part of the upper fixed drum 168 for β, and a rotating drum 171 disposed above the fixed drum 170. It has a drum structure, and the diameters of both drum parts 170 and 171 are the same, and the three drum parts 1 for β
It has a smaller diameter than 67, 168, 169. In addition, both rotating drums 169 for β and VHS,
A pair of video heads 172 and 173 for β and VHS are attached to the periphery of video head 171, respectively. Further, both rotating drums 169 and 171 are fixed to rotating shafts 176 and 177 for β and VHS via support members 174 and 175, respectively. The rotating shaft 176 for β is rotatably supported by a bearing block 178 fixed to the lower fixed drum 167 via a pair of upper and lower bearings 179, and the rotating shaft 177 for VHS is supported by a pair of upper and lower bearings 180. It is rotatably supported via a bearing 181.

Then, the VHS bearing block 180 is positioned by fitting into the positioning hole 182 provided in the upper fixed drum 168 for β by means of the flange portion 180' integrally provided at its lower end. It is detachably mounted on the fixed drum 167. Therefore, fixed drum 1 for VHS
70. Among the rotating drum 171 and the rotating shaft 177, the fixed drum 170 is precisely centered on the same axis as the upper fixed drum 168 for β by the above-mentioned integral molding, and the rotating drum 171 and the rotating shaft 177 are The positioning of the bearing block 180 ensures that it is precisely centered on the same axis as the upper stationary drum 168.

Next, the lower fixed drum 167 for β is fixed on the lifting platform 1 mentioned above, and the lower end of the drum support member 184 is fixed to a part of the circumferential surface of the lower fixed drum 167 by a plurality of set screws 183. It is attached removably. And upper fixed drum 1 for β
68 is attached to the drum support member 1 by a part of its circumferential surface.
It is detachably attached to the upper end of 84 with a plurality of set screws 185. With this installation, the upper fixed drum 168 is connected to the lower fixed drum 167.
and the rotary drum 169, and the axes of the rotating shaft 177 for VHS and the rotating shaft 176 for β are accurately centered on the same axis.

At this time, the rotation shafts 176 and 177 are connected in the axial direction, and the rotation shaft 176 and 177 are connected in the axial direction.
A coupling 186 is provided to transmit the rotational force of the rotary shaft 177 to the rotating shaft 177. This coupling 1
86 is in the shape of a disk as shown in FIG. 10, and four through holes 187 are provided at intervals of 90 degrees. On the other hand, the upper end surface of the cylindrical portion 174' of the support member 174 fixed to the rotating shaft 176 for β, and the lower surface of the disc portion 177' provided at the lower end of the rotating shaft 177 for VHS, each have an angle of 180°. A pair of protrusions 188 and 189 are provided at intervals. The coupling ring 186 is first fitted into the pair of protrusions 188 through two of its four through holes 187 and placed on the upper end surface of the cylindrical portion 174'. Next, in this state, in order to attach the upper fixed drum 168 for β to the drum support member 184 as described above, when placing the disc portion 177' of the rotating shaft 177 on the coupling ring 186, the remaining two parts of the coupling 186 are placed. A pair of protrusions 189 are fitted into two through holes 187 to form a coupling ring 186.
Both rotating shafts 176 and 177 are coaxially connected through the shaft.

By the way, according to the drum assembly 2 configured in this way, the drum section 2b for β and the drum section 2 for VHS can be assembled in a single installation process of attaching the upper fixed drum 168 to the drum support member 184.
It is possible to assemble the rotating shafts 176 and 177 very precisely in two stages, upper and lower, coaxially, and also to connect both rotating shafts 176 and 177 coaxially. Therefore, assembly is very easy and serviceability is also high.

Further, a motor section 281 is provided integrally with the lower side of the head section 2b for β, and the rotating shaft of this motor section 281 is common to the rotating shaft 176 for β. The rotating shaft 176 further includes a motor section 28.
A drum pulley 282 is attached to the lower side of 1. The motor section 281 is connected to the yoke 28 as is conventionally known.
3. It is composed of a magnet 284, a coil 285, etc. By driving this motor section 281, the rotating shaft 176 for β is rotated, the rotating drum 169 for β is rotated, and at the same time, the rotating shaft 176 for VHS is
7 is rotated, and the rotary drum 171 for VHS is rotated. Therefore, this motor section 281 has a structure that is shared by the drum section 2b for β and the drum section 2a for VHS, and also has both rotating shafts 176,
By connecting 177 in the axial direction,
The rotational speeds of both rotating drums 169, 171 exactly match. Note that this motor section 281 projects downward from an opening 286 provided in the lifting platform 1.

Further, dedicated rotary transformers 287 and 288 are built into both drum sections 2a and 2b, respectively, and a pulse generator 289 shared by both drum sections 2a and 2b is connected to the drum section 2a for VHS.
incorporated within. The pulse generator 289 is composed of a magnet 290 attached to the support member 175 and a detection coil 291 attached to the fixed drum 168.

Next, the configuration of the elevating mechanism of the elevating table 1 will be explained with reference to FIGS. 11, 12A, and 12B.

First, both sides 293 and 29 in the left and right direction of the lifting platform 1
4 has a pair of protrusions 190, 191 and 19, respectively.
2,193 are provided, and these protrusions 1
A pair of support plates 194, 195 having horizontal elongated holes 196, 197 are attached between 90, 191 and 192, 193, respectively. The support plates 194, 194 each have appropriate elasticity, and are each attached substantially perpendicularly to the elevator platform 1. On the other hand, the main chassis 3 is provided with a pair of gears 198 and 199 which are rotatably arranged opposite to the support plates 194 and 195 and have the same diameter and are arranged on the same axis. A pair of eccentric rotation pins 200 and 201 are attached to 198 and 199 with the same amount of eccentricity. And these two eccentric rotation pins 2
00 and 201 are inserted into long holes 196 and 197 of both the support plates 194 and 195, respectively. Further, both gears 198 and 199 are interlocked with gears 204 and 205 via gears 202 and 203, respectively, and these gears 204 and 205 have a common rotating shaft 20.
Worm gear 207 provided in 6, worm 2
08, it is configured to be driven by a motor 210 that can rotate in forward and reverse directions via a belt 209 and the like. The driving force generated by the forward or reverse rotation of this motor 210 rotates both gears 198 and 199 approximately 180 degrees, and both eccentric rotation pins 200 and 20 are rotated approximately 180 degrees.
1 is moved up and down in an arc shape between points X and Y as shown in FIG. 12A, thereby moving the lifting platform 1 up and down.

Next, a pair of positioning pins 214 and 215 are provided on one side surface 293 of the lifting platform 1, as shown in FIG. On the other hand, on the main chassis 3 side,
As shown in FIG. 12A, a pair of height regulating portions 216, 217 and 218, 219 are provided on the upper and lower sides, respectively. and height regulating portions 216 to 21
9 are provided with approximately V-shaped recesses 216' to 219', respectively. When the lifting platform 1 is lifted to the upper position shown by the solid line in FIGS. 12A and 12B, that is, to the β position, both positioning pins 214, 21
5 is pressed and positioned by the recesses 216' and 217' of the upper pair of height regulating parts 216 and 217. Furthermore, when the elevator platform 1 is lowered to the lower position shown by the chain line in FIGS. 12A and 12B, that is, to the VHS position, both positioning pins 214 and 215 are moved to the recesses 218' of the lower pair of height regulating parts 218 and 219. ,2
19' to position it. In this case, for example, the moving distance of the eccentric rotation pin 200, that is, the linear distance between X and Y, l ₂₁ is configured to be slightly longer than the moving distance of the lifting platform 1, that is, the distance between the β position and the VHS position l ₂₂ . . Therefore, the eccentric rotation pin 200 is attached to the support plate 194 at the X point or the Y point, respectively.
The upper side 196' or the lower side 196'' of the elongated hole 196 is pressed against the elasticity, respectively, so that the side 196' or 196'' is slightly deformed up and down against the elasticity. It's getting old. Therefore, both positioning pins 214 and 215 are connected to the side portion 19 of the support plate 194.
6′ or 196″ of elastic repulsive force causes the recess 216′,
217' or 218' and 219' respectively,
In FIG. 12A, the position is regulated in the vertical and horizontal directions.

On the other hand, although not shown, another pair of positioning pins are provided on the opposite side surface 294 of the lifting platform 1 in a direction perpendicular to both the positioning pins 214 and 215, and are provided on the main chassis 3 side. The position is regulated in the vertical and horizontal directions in FIG. 11 between a pair of height regulating parts having V-shaped recesses similar to those described above.

With the above-described positioning structure, the elevator platform 1 is stably positioned at two positions, the β position and the VHS position, completely immovable up and down, left and right, and front and back. At this time, the motor 210 and both gears 1
Worm 208 is placed in the transmission path between 98 and 199.
and the worm gear 207, and both gears 198, 19 branched from the worm gear 207.
A pair of transmission paths up to 9 are connected to gears 204 and 20, respectively.
2, 205, and 203, when the motor 210 stops rotating, both eccentric rotation pins 200, 201 are automatically moved to the raised or lowered positions via the gears 198, 199, respectively. It will be locked.

Next, the lifting platform 1 is moved by the two gears 198 and 1 by the swinging arm 211 as shown in FIGS. 11 and 12B.
99 is configured to be raised and lowered up and down while being prevented from swinging around the rotation axis _P1 . That is, first, the swinging arm 211 has a substantially H shape, and the pair of arm portions 21
1' is attached to the main chassis 3 so as to be swingable in the vertical direction by a pair of fulcrum pins 212 having a rotation center P ₂ perpendicular to the rotation center P ₁ of the gears 198 and 199. . The upper ends of the pair of arm portions 211' of the swing arm 211 are connected to both side surfaces ₂₁ in the front and back direction of the lifting platform 1 by a pair of fulcrum pins 213 parallel to the rotation center P2.
5,296 is swingably attached. Therefore, as described above, when the elevator platform 1 is moved up and down with the rotation of both eccentric rotation pins 200 and 201, the swing arm 211 moves in the direction of arrow E in FIG. 12B around both fulcrum pins 212. be swayed. As a result, the movement and swinging of the lifting platform 1 in the direction of the arrow P in FIG. It will be translated in an arc in the direction.

As described above, the lifting platform 1 is supported so that its entirety is inclined at the same inclination as the loading ring 4 (θ ₃ =9°58'). Further, the drum assembly 2 is installed at a different angle (5°00') than the lifting platform 1.

Further, as shown in FIG. 11, the gear 198 has a surface opposite to the eccentric rotation pin 200 and a
A protrusion 220 is provided at a position shifted by approximately 90 degrees from 00. On the other hand, on the main chassis 3 side, there is a protrusion 22 when the gear 198 rotates 180 degrees as described above.
A pair of detection switches (not shown) are provided at positions corresponding to the initial position and final position of 0, respectively. Then, the gear 198 rotates approximately 180 degrees in either direction, and the elevator platform 1 is placed in the β position or the VHS position.
When the position is reached, the protrusion 220 pushes the one of the pair of switches corresponding to the β position or the VHS position, thereby stopping the motor 210 each time. Note that forward rotation or reverse rotation of the motor 210 is selected by these pair of switches. The drive of the motor 210 is started by the detection switch 13 of the sliding plate 100 described above.
This is done based on the detection signal from 0.

Next, the structure of the driving force transmission mechanism for driving the reel stands 75, 76 will be explained with reference to FIGS. 13, 14A, and 14B.

First, in the VTR according to this embodiment, the reel stand 75,
The driving force of 76 is obtained from the motor section 281 of the drum assembly 2 mentioned above, and this driving force is transmitted from the drum pulley 282 to the mechanical pulley 93 mentioned above via the belt 221. A support plate 222 is attached to the lower surface of the elevator platform 1, and two idlers 223 and 224 are attached to this support plate 222 via swing arms 225 and 226, respectively. On the other hand, there is another support plate 22 on the main chassis 3.
7 is attached to the support plate 227, and two idlers 228 and 229 are also attached to this support plate 227 via swing arms 230 and 231, respectively.
The belt 221 mentioned above is attached to the drum pulley 28.
2 and the mechanical pulley 93 via idlers 223, 224, 228, and 229 as shown in the figure.

Next, swing arms 225, 226, 230, 23
1 has a substantially L-shaped configuration, and the idlers 223, 224, 228, 2 are connected to one end of the idlers 223, 224, 228, 2.
29 are rotatably pivotally connected to each other. The other ends of the swinging arms 225, 226, 230, 231 are swingably attached to support plates 222, 227, respectively, via fulcrum shafts 232, 233, 234, 235, respectively. The fulcrum shaft 232 is provided on an extension of the belt 221a stretched between the drum pulley 282 and the idler 223 in the stretching direction, and the fulcrum shaft 233 is stretched between the drum pulley 282 and the idler 224. It is provided on an extension of the belt 221f in the stretching direction. Also, fulcrum shaft 2
34 is provided on the extension of the belt 221c stretched between the mechanical pulley 93 and the idler 228, and the fulcrum shaft 235 is provided on the extension of the belt 221c stretched between the mechanical pulley 93 and the idler 228.
Belt 2 stretched between 3 and idler 229
It is provided on the extension of 21d in the stretching direction. Therefore, for example, when the swinging arm 225 swings around the fulcrum shaft 232, the idler 22 moves as shown in FIG. 14B.
3 rotates around the direction in which the belt 221a is stretched, and the rotational movement of the idler 223 does not change the direction in which the belt 221a is stretched. And this means that other idlers 22
The same applies to 4,228,229.

This will be explained in detail with reference to FIGS. 14A and 14B. First, as described above, as the lifting platform 1 moves up and down, the drum pulley 282 is integrally attached to the drum assembly 2 as shown in FIG. 14A.
Translate vertically between the position and the VHS position indicated by the chain line. Furthermore, since the idlers 223 and 224 (the idler 223 is not shown) are also supported by the lifting platform 1, they also move vertically in parallel as shown.
On the other hand, the mechanical pulley 93 and the idler [idler 22
9 (not shown) are supported by the main chassis 3, so they do not move up and down. Therefore, the drum pulley 282, mechanical pulley 93, and idlers 223, 224, 228, 229 are connected to the lifting platform 1.
are arranged on the same plane when they are in the VHS position, and the drum pulley 282 and idler 22 are arranged on the same plane when the elevator platform 1 is in the β position.
3,224, mechanical pulley 93 and idler 22
As shown in the figure, there is a difference in height h between 8 and 229. However, in the configuration of this embodiment, at this time, for example, as shown in FIG. 14B, the idler 22
4 rotates around the belt 221f, and the idler 229 rotates around the belt 221d. Therefore, by rotating these idlers 224 and 229, the stretching direction of the belt 221 is changed to the belt 221f,
In the part 221d, the belt 22 is left unchanged.
It is possible to change only the portion 1e as shown. This also applies to the idlers 223 and 228.

Note that the swing arms 225 and 230 and 226 and 2
31 are connected by coil springs 262 and 263, respectively, and these swing arms 225 and 230
226 and 231 are arranged to swing in conjunction with each other.

Next, the operation of the VTR configured as above will be explained.

First, the switching operation between β and VHS will be explained.
In the VTR of this embodiment, switching between the β tape tape and the VHS tape tape is automatically performed by inserting the respective tape cassette 237 or 238 into the cassette holder 133.

That is, when the β tape cassette 237 is inserted into the cassette holder 133, the sliding plate 100 is in the β position shown in FIGS. 2 and 4 due to the biasing force of the coil spring 105. Therefore, the pivot pin 134 inserted into the elongated hole 132 of the plate member 131 places the pivot lever 151 in the β position shown by the dotted line in FIG. The rotating member 141 that is also located at the β position shown in the figure. And this β tape cassette 2
Reference numeral 37 denotes a positioning roller 148 provided on the rotating member 141, and a positioning roller 147 provided on the rotating member 140 that interlocks with the rotating member 141.
As shown in FIG. 15A, it is sandwiched and positioned from both the left and right sides. Note that this β tape cassette 237 is attached to the β stopper 1 provided on the rotating plate 154 at the position shown by the solid line in FIG. 15B.
The amount of insertion is regulated by 59,160, and
The lid lock and reel lock are released by the lock release plate 161 for β.

In this state, the take-up reel stand 76
The upper reel stand 84 is in the β position shown by the solid line in FIG. 2, and the β positioning pin 1 is shown in FIG.
08, 109 are protruding above the height regulating tubes 112, 113, and the VHS positioning pins 118,
119 is retracted into height regulating tubes 122 and 123. Furthermore, as shown in FIG. 4, a VHS end sensor light source 125 and a reel lock release pin 12 are installed.
6 are in a horizontal state.

The position of the sliding plate 100 at this time is detected by the detection switch 130, and based on the detection signal, the electrical mechanisms of the VTR, such as the rotational speed of the capstan 33, are all switched to β. Further, the lifting platform 1 is in the raised position shown in FIGS. 12A and 12B, that is, in the β position.

On the other hand, when a VHS tape cassette 238 is inserted into the cassette holder 133, the VHS tape cassette 238 is guided by a guide plate 145 and rotates the rotating members 140 and 141 to the VHS position shown by the chain line in FIG. 15A in such a way that the rotating members 140 and 141 are pushed open.
15A. The VHS tape cassette 238 is positioned by being pinched from the left and right sides by the positioning rollers 147, 148 at the position shown by the chain line in FIG.
5B, the stoppers 159, 160 and the cover lock release plate 161 for β are moved to positions where they do not impede the insertion of the VHS tape cassette 238. Therefore, the VHS tape cassette 238 is inserted into the cassette holder 133 through the stoppers 162,
The tip of the leaf spring 164 presses the protrusion 257,
The lid lock is released.

When the rotating member 141 is pushed by the VHS tape cassette 238 and rotates clockwise in FIG. 15A, the coil spring 152 causes the rotating lever 15 to rotate.
1 also rotates in the same direction. Therefore, the rotation pin 134 provided at the tip of the rotation lever 151 is
The rotation of the rotation pin 134 causes the sliding plate 100 to slide to the right in FIG. 2 against the coil spring 105, changing from the state shown in FIG. 4 to the state shown in FIG. can be switched to the state. Also, at this time, the L-shaped arm 91 attached to this sliding plate 100 allows
The upper reel stand 84 of the take-up reel stand 76 is moved from the β position shown by the solid line in FIG. 2 to the VHS position shown by the chain line. Further, as shown in FIG. 5, the positioning pins 108, 109 for β are retracted into the height regulating cylinders 112, 113, and the positioning pins 118, 1 for VHS are retracted into the height regulating cylinders 112, 113.
It pops out above the height regulating cylinders 122 and 123 of No. 19. At the same time, the VHS end sensor light source 125 and reel lock release pin 126 are activated, respectively.
Rotate 90 degrees to vertical position. The movement of the sliding plate 100 at this time is detected by the detection switch 130, and based on the detection signal, all the electrical mechanisms of the VTR are switched to VHS. Also, based on this detection signal, the motor 210 is driven, and the twelfth
The lifting platform 1, which is in the raised position shown in Figures A and 12B, is lowered and moved to the VHS position.

By the way, after selectively inserting both tape cassettes 237 or 238 into the cassette holder 133 as described above, the operator
When the tape cassette 237 or 238 is pressed down and the cassette is loaded into the cassette loading position, these tape cassettes 237 or 238 are moved against the height regulating cylinders 112, 113,
122, 123 and height regulation pins 273, 274
It is placed on top and supported horizontally at a predetermined height. At this time, when the β tape cassette 237 is installed, the β positioning pins 108, 109
The tape cassette 237 is positioned in the front-rear and left-right directions, and the lid 237 is positioned in the β position by the lid lifting plate 253 of the sliding plate 100.
68 is released. Also VHS tape cassette 2
38 is installed, the tape cassette 2 is fixed by the VHS positioning pins 118 and 119.
38 is positioned in the front-back and left-right directions, and the lid 269 is opened by the lid lifting plate 253 of the sliding plate 100 that has been moved to the VHS position.
Note that when the VHS tape cassette 238 is installed, the end sensor light source 125 and the reel lock release pin 126 are connected to the tape cassette 238.
8 respectively. The mounted cassette holder 133 is locked at the cassette mounting position and positioned by the positioning pin 129 of the sliding plate 100.

When the VHS tape cassette 238 is removed from the cassette holder 133, the sliding plate 100 is moved back to the β position by the urging force of the coil spring 105. Therefore, by the operation opposite to that described above, the VTR is placed in the same state as when the β tape cassette 237 was inserted, and at this time, the motor 210 is driven based on the detection signal from the detection switch 130, and the elevator platform 1 is also in the β state. Return to position.

Next, the operation of the tape loading mechanism will be explained with reference to FIGS. 16 to 26.

First, when tape unloading is complete,
The tape loading mechanism has been returned to the state shown in FIGS. 16 and 21. In this state, as described above, the β tape cassette 237 or
When the VHS tape cassette 238 is installed,
The tape pull-out pin 47 is inserted into the notch 248 or 249 of the tape cassette 237 or 238 and inserted inside the tape 241 or 242.

However, when the cassette is installed as described above,
As is conventionally known, this is detected by a cassette loading detection switch (not shown), and tape loading is then automatically started.

That is, first, the loading ring 4 begins to rotate counterclockwise in FIG. 16. Then, the roller 67 of the tape drawing mechanism is guided to the wall 16' of the recess 16 of the loading ring 4, and
get out of The wall portion 16' of the recess 16 is configured as a cam, and at this time, the rotating arm 66 on which the roller 67 is provided rotates counterclockwise around the fixed shaft 63. Then, due to the rotation of the rotation arm 66, the interlocking rod 61 moves to the left as shown in FIG. 22, and the rotation member 60 is rotated counterclockwise around the fixed shaft 53. At this time, this rotating member 6
0 pushes the rotating arm 51 via the pin 62, and this rotating arm 51 also rotates counterclockwise around the fixed shaft 53. The rotating arm 51 is connected to a U-shaped member 46, and as the rotating arm 51 rotates, the U-shaped member 46 rotates, and the ten-legged arm 45 attached to this U-shaped member 46 moves to the 17th U-shaped member. Move as shown in the figure. However, at this time, the tape cassette 237 is pulled out by the tape pull-out pin 47.
Alternatively, the tape 241 or 242 is pulled out from the tape cassette 237 or 238, and a tape loop is formed on the front side of the tape cassette 237 or 238 as shown.

On the other hand, when the loading ring 4 continues to rotate from the state shown in FIG. 17, the tape guide 10 provided on the loading ring 4 is tilted as described above.
The pinch roller 9 then passes under the tape 242 or 241 on the supply side and moves until the state shown in FIG. 18 is reached.

Then, when the loading ring 4 rotates further, the tape guide 10 moves the tape 24 on the winding side.
1 or 242 and move as shown in FIG. At this time, the roller 70 of the tape pull-out mechanism is guided by the inner surface of the loading ring 4 and introduced into the groove 17 provided on the lower surface of the ring 4.
As shown in FIG. 3, it rotates counterclockwise around a fixed shaft 63.

The operation of the groove 17 and the roller 70 will now be described in detail with reference to FIG.

First, when the tape loading mechanism is in the initial state shown in FIG. 16, the roller 70 is in position Q shown in FIG. 26 and is in contact with the inner surface 4' of the ring 4.
Then, when the loading ring 4 starts rotating as described above, the roller 70 is guided by the inner surface 4' of the loading ring 4 and relatively moves from point Q to R.
After passing through point, we reach point S. During this time, the rotating arm 6
8 does not rotate. On the other hand, the inner surface 4' of the loading ring 4 is configured as a cam near the entrance of the groove 17, and the roller 70 passes from point S to point T and enters the groove 17.
As the rotating arm 68 is introduced into the interior, the rotating arm 68 is rotated by the biasing force of the coil spring 71.

Then, due to the rotation of this rotation arm 68, the second
As shown in FIG. 3, a protrusion 64' provided on the side surface of the rotating member 64 is engaged with a wall 68'' of the rotating arm 68, thereby restricting the clockwise rotation of the rotating member 64. Therefore, even if the loading ring 4 rotates 360 degrees and the roller 67 provided on the rotating member 64 again faces the concave portion 16 of the loading ring 4, at this time it will not rotate as described above. The rotation of the rotation member 64 in the clockwise direction is controlled by the rotation plate 68.
This prevents the rotating member 64 from rotating and the tension gear arm 45 from returning to the state shown in FIG. 16.

Also, due to the rotation of the rotating arm 68, the interlocking rod 58 moves to the left as shown in FIGS. The movable arm 55 is rotated counterclockwise around the fixed shaft 53. At this time pin 62
As shown in FIG.
It further rotates counterclockwise due to the biasing force of . Accordingly, the tensile gear arm 45 is further moved to the state shown in FIG. 20, whereby the tape 241 or 242 is pressed against the β erasing head 18 or the VHS erasing head 25, respectively.

When the loading ring 4 is rotated from the initial state shown in FIG. 16 to a predetermined angle of 360 degrees or more, for example, 405 degrees, the state shown in FIG. 20 is obtained. At this time, loading of the tape is completed and rotation of the loading ring 4 is stopped.

By the way, this VTR has β tape cassette 23.
7 is installed, the lifting table 1 is in the upper position, so the tape 241 for β is sequentially moved from the supply reel to the guide pin 20 and the erasing head 1 as shown in the figure.
8. β leading to the take-up reel via the tape pull-out pin 47, guide pin 21, drum part 2b, guide pins 22, 23, AC head 19, guide pin 24, tape guide 10, guide part 243, tape guides 11 to 13 is loaded onto the tape path for

On the other hand, this VTR has a VHS tape cassette 238.
is installed, the lifting platform 1 has been lowered, so the guide pins 20 to 24 for β described above,
Erase head 18, drum section 2b, AC head 19
is hanging down. Therefore, VHS tape 2
42 is not caught by these, but instead, VHS guide pins 27 to 30, triangular guide 31, and 3
2. The erase head 25, AC head 26, drum unit 2a, etc. load the tape onto a VHS tape path as shown in the figure.

Next, when the operator presses a playback button or the like with the tape loading shown in FIG. is crimped onto the capstan 33 via tape 241 or 242. As a result, the tape 241 or 242 is run at a predetermined speed, and desired playback or the like is performed.

Next, the operations of the switches 38, 39, and 73 will be explained. These switches 38, 39, and 73 are provided to control the rotational drive of the loading ring 4.

First, in the state shown in Fig. 16, the switch operation lever 4 is
The pin 43 of the switch 3 is fitted into a recess 40 provided on the inner surface of the loading ring 4.
8 is in the on state. On the other hand, switch 39 is in an off state, and switch 73 is in an on state. In this state, the loading ring 4 starts rotating and the above-described tape loading operation is started.

Then, the loading ring 4 rotates and the 17th
When the state shown in the figure is reached, switch operation lever 4
2, the switch operating lever 42 rotates and pushes the operator of the switch 39, turning the switch 39 on.
At this time, since the switch 73 is still in the on state, the loading ring 4 is not stopped and continues to rotate. Next, when the interlocking rod 58 slides to the left in FIG. 24 by the aforementioned cam mechanism, the switch operating lever 74 connected to the interlocking rod 58 rotates as shown in FIG. 25, turning the switch 73 into the OFF state. Make it. Then, when the loading ring 4 rotates 360 degrees, the pin 43 of the switch operating lever 41 fits into the recess 40 again, turning the switch 38 on, but this time the switch 73 is off, so
Again, the loading ring 4 is not stopped and continues to rotate. And the loading ring 4 is
When the rotation of 405 degrees is completed and the loading of the tape is completed and the state shown in FIG. 7
Since loading ring 3 is off, loading ring 4
drive is stopped. In the case of tape unloading, the drive of the ring 4 is stopped when the switches 38 and 73 are both turned on, ie, in the state shown in FIG. 16, by the reverse operation of the above-described loading operation.

Further, the rotation of the loading ring 4 through 405 degrees is mechanically controlled by the protrusions 265 and 266 provided on the back side of the loading ring 4 and the protrusion 267 provided on the rotating arm 68. It is becoming more and more common. That is, let us first assume that the loading ring 4 starts rotating counterclockwise from the state shown in FIG. 16 and reaches the state shown in FIG. 17. At this time, the rotating arm 68 is in the state shown in FIG. 22 and has not yet rotated. Therefore, at this time, the projection 266 provided on the back side of the loading ring 4 does not come into contact with the projection 267 of the rotating arm 68, and the loading ring 4 continues to rotate. When the loading ring 4 continues to rotate and reaches the state shown in FIGS. 18 to 19, the rotating arm 68 rotates as shown in FIG. 23, as described above. Therefore, when the loading ring 4 has rotated exactly 360 degrees and is in the same state as shown in FIG. The protrusion 215 does not come into contact with the protrusion 265,
Therefore, the loading ring 4 continues to rotate further. When the loading ring 4 finishes rotating to 405 degrees and tape loading is completed, and the state shown in FIG.
7, the rotation of the loading ring 4 is stopped. In addition, the loading ring 4 in the reverse operation, that is, when unloading the tape.
When the loading ring 4 is rotated clockwise, the protrusion 265 is in the state shown in FIG.
The rotation of the loading ring 4 is stopped by contacting the protrusion 267 of the rotating arm 68 that has moved back.

By the way, the rotating arm 51 interlocked with the ten leg gear arm 45 is constructed as a control arm of a band brake (not shown) of the supply reel stand 75, as is conventionally known. When the above-mentioned tape loading is completed, the pin 62 of the rotating arm 51 is separated from the rotating member 60, as shown in FIG. A gap is formed in which the pin 62 can move as the rotating arm 51 rotates. Therefore, the balance gear arm 45 linked to this rotating arm 51 can freely rotate around the pin 50 against the coil spring 54 within the rotary range of the rotating arm 51. As is conventionally known, the tension regulator arm 45 detects the tape tension and automatically adjusts the back tension of the supply reel stand 75 in accordance with the detected tape tension. .

An embodiment in which the present invention is applied to a cassette-type VTR has been described above, but the embodiment described above does not limit the present invention in any way, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, the present invention was applied to a VTR that can be switched between the β-max system and the VHS system.
The present invention can also be applied to other systems.

As explained above, the present invention includes a first fixed drum 167 and a first fixed drum fixed to the first fixed drum 167.
a bearing block 178; a first rotating shaft 176 supported by the first bearing block 178 via a bearing 179; a support member 174 fixed around the upper end portion of the first rotating shaft 176; The rotary head 1 is fixed to the support member 174 and placed above the first fixed drum 167.
72; a second fixed drum 168 disposed above the first rotating drum 169; a third fixed drum 170 having a different diameter from the second fixed drum 168; and a second fixed drum 170 fixed to the third fixed drum 170.
a second rotating shaft 177 supported by the second bearing block 180 via a bearing 181; and an upper part of the third fixed drum 170 attached to the second rotating shaft 177. a second rotating drum 171 having a rotating head 173 disposed in
a pair of protrusions 188 provided on the upper end surface of the support member 174 fixed to the first rotation shaft 176 and arranged symmetrically with respect to the first rotation shaft 176; The second rotating shaft 177 is attached to the lower surface of a disc portion 177' provided at the lower end of the shaft 177.
a pair of protrusions 189 arranged symmetrically with respect to the axis of the support member 174 and provided at the same spacing as the pair of protrusions 188 provided on the support member 174; The pair of support members 174 are disposed between the upper end surface of the support member 174 and the lower surface of the disk portion 177' provided at the lower end of the second rotating shaft 177, and are provided on the support member 174. Projection portion 188 and the disk portion 17
A rotary head device is provided with a disc-shaped coupling member 186 having at least four through holes 187 arranged at an interval of 90 degrees and respectively fitted into the pair of protrusions 189 provided on the rotary head 7'. This is related.

Therefore, according to the present invention, it is possible to center the two types of drum parts disposed above and below having different diameters extremely accurately so that they are in the same axial center state, and the assembly can be performed extremely accurately. can be done.

Also, since the two types of rotating shafts are connected to each other via a coupling member with a diameter larger than that of each rotating shaft, a large torque can be transmitted. It can be driven extremely accurately and stably.

Furthermore, since the second rotating drum and the second and third fixed drums can be easily removed together with the second rotating shaft, maintenance and inspection of these members and the first rotating drum etc. is easy, and service is easy. Very good quality etc.

[Brief explanation of the drawing]

The drawing shows one embodiment in which the present invention is applied to a cassette-type videotape recorder.
Figure A is a perspective bottom view comparing the size and structure of a β tape cassette and a VHS tape cassette, Figure 1B is a side view of the same, Figure 2 is a plan view showing the overall configuration of the device, and Figure 3. is an exploded perspective view showing the structure of the tape drawer mechanism, FIG. 4 is a partially cutaway perspective view at the β position to explain the structure and operation of the cassette loading mechanism, and FIG. 5 is a partially cutaway perspective view at the same VHS position. , FIG. 6 is an enlarged schematic perspective view at the β position for explaining the structure and operation of the take-up reel shaft, FIG. 7 is an enlarged schematic perspective view at the same VHS position, and FIG. 8 is an enlarged schematic perspective view showing the structure of the cassette holder. FIG. 9 is a longitudinal sectional view showing the structure of the rotating head mechanism; FIG. 10 is a partially enlarged perspective view showing the connection between the rotating shafts of the VHS rotating drum and the β rotating drum; Fig. 11 is a perspective view showing the configuration of the elevating mechanism of the elevating platform, and Fig. 12 is Fig. 11 XIIA-XIIA
12B is a sectional view taken along the line XIIB-XIIB in FIG. 12A, FIG. 13 is a bottom view showing the configuration of the belt transmission mechanism, and FIG. Figure 14B is a side view showing the rotational movement of one idler of the same mechanism, Figure 15A is a partially cutaway plan view for explaining the operation when each tape cassette is inserted into the cassette holder, and Figure 15B is a side view showing the rotational movement of one idler of the same mechanism.
The figure is a sectional view taken along the line B-B in Figure 15A, and Figure 16.
The figure is a schematic plan view in an initial state to explain the tape loading operation, Figure 17 is a schematic plan view similar to Figure 16 showing the state in which the first cam mechanism is in operation, and Figure 18 is a loading ring. FIG. 19 is a schematic plan view similar to FIG. 16 showing a state in which the second cam mechanism is operating; FIG. 20 is a schematic plan view similar to FIG. 16 showing a state in which the tape loading operation is completed; FIG. 21 is a schematic plan view in an initial state for explaining the operation of the tape pulling mechanism;
Figure 2 shows the second cam mechanism in a state in which the first cam mechanism is in operation.
FIG. 23 is a schematic plan view similar to FIG. 21 showing a state in which the tape loading operation is completed; FIG. 24 illustrates the operation of parts related to the second cam mechanism. FIG. 25 is a schematic plan view showing a state in which the second cam mechanism is not operating, with the upper part of the tape drawing mechanism omitted for the purpose of removing the tape, and FIG. 25 is similar to FIG. 24 showing a state in which the second cam mechanism is operating. FIG. 26 is a schematic plan view of the loading ring, and FIG. 26 is a perspective view of the loading ring viewed from the bottom side. In addition, in the symbols used in the drawings, 16
7...Fixed drum for β (first fixed drum), 1
68...fixed drum for β (second fixed drum),
169... Rotating drum for β (first rotating drum),
170... Fixed drum for VHS (third fixed drum), 171... Rotating drum for VHS (second rotating drum), 176... Rotating shaft for β, 177...
Rotating shaft for VHS, 180...Bearing block, 18
4...Drum support member, 186...Coupling.

Claims (1)

[Claims for Utility Model Registration] A first fixed drum, a first bearing block fixed to the first fixed drum, and a first rotating device supported by the first bearing block via a bearing. a first rotary drum having a shaft; a support member secured around an upper end portion of the first rotary shaft; and a rotary head secured to the support member and disposed above the first fixed drum. a second fixed drum disposed above the first rotating drum; and a third fixed drum integrally disposed above the second fixed drum and having a diameter different from that of the second fixed drum. a fixed drum; a second bearing block fixed to the third fixed drum; a second rotating shaft supported by the second bearing block via a bearing; a second rotating drum having a rotating head attached and disposed above the third fixed drum; and a second rotating drum having a rotating head attached to the upper end surface of the support member fixed to the first rotating shaft. a pair of protrusions arranged symmetrically with respect to the axis of the second rotation shaft; , and a pair of protrusions provided at the same interval as the pair of protrusions provided on the support member, and an upper end surface of the support member fixed to the first rotation shaft and the second rotation axis. The pair of protrusions provided on the supporting member and the pair of protrusions provided on the disc part are arranged between the lower surface of the disc part provided at the lower end of the shaft, and the pair of protrusions provided on the disc part, respectively. A rotary head device comprising at least four mating disc-shaped coupling members spaced at 90° from each other and each having at least four through holes.