JPH0349141B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape loading device such as a VTR (video tape recorder), and particularly to a tape loading device suitable for use in a compact VTR using a compact tape cassette. This invention relates to a deing device.

BACKGROUND TECHNOLOGY AND PROBLEMS As is well known, in conventional VTRs, when a tape cassette is loaded, the pinch roller on the loading ring and the tape guide adjacent thereto enter into the opening of the tape cassette, and the loading ring rotates. Accordingly, the tape guide pulls out the tape in the cassette and wraps it around the rotary head drum, thereby threading the tape along a predetermined running path.
However, as the tape cassette becomes smaller, there is not enough space in the opening, so the tape is pulled out to a specified position, and after the tape is pulled out, the tape guide on the loading ring is hooked onto the pulled out tape. the tape must be loaded. On the other hand, in response to the miniaturization of VTRs, the entire device must be made more compact, so in tape loading devices for VTRs that use small tape cassettes, the drive device is also required to be made more compact.

Purpose of the Invention The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a tape pull-out member, by which the tape in the attached tape cassette is pulled out to a predetermined position, and after that, the tape is drawn out to a predetermined position. An object of the present invention is to provide a tape loading device that is extremely small in size and capable of loading a wide variety of tapes.

Summary of the Invention In order to achieve the above objects, the present invention includes a differential gear device driven by a motor, a loading ring driven from one output shaft of the differential gear device, and a loading ring that is connected to a predetermined position. A tape pull-out member driven from the other output shaft of the differential gear device; and a second lock mechanism that locks the tape pull-out member at a predetermined position. When the tape cassette is installed, the motor rotates in the normal direction, and the tape pull-out member first pulls out the tape to a predetermined position, and after this pull-out, the loading ring rotates and the The tape guide was configured to further pull out the tape and pass it along a predetermined tape running path.

By configuring as described above, it is possible to provide a tape loading device that is equipped with a tape pull-out member and that is extremely miniaturized.

EXAMPLE The present invention will be described below using a small tape cassette.
An embodiment applied to a tape loading device for a VTR will be described based on the drawings.

(Schematic explanation of the entire apparatus) First, the outline of the entire apparatus will be explained with reference to FIGS. 1 and 2.

The tape cassette 1 is guided by positioning pins 2 and 3 and mounted on a supply reel stand 4 and a take-up reel stand 5. Reference numeral 6 denotes a differential gear device driven by a loading motor (not shown) via a reduction gear, and one of its output shafts is connected to a ring gear drive gear 8 that meshes with a ring gear of a loading ring 7. , the other output shaft is the first to
It is connected to a cam wheel 9 in which a third cam groove is formed. Lever devices for each function are provided which engage and interlock with these cam grooves, and the rotation of the loading ring 7 and the rotation of the cam wheel 9 are independently and continuously controlled from one loading motor. I'm going. The rotation of the cam wheel 9 not only draws out the tape but also switches the mode.Electrically, the cam switch 11 provided on the cam wheel shaft 10 shown in FIG. The configuration is such that switching between each mode is performed.

Next, when loading the tape, first the tape pull-out arm 12 and the tension regulator (hereinafter referred to as the tension regulator) arm 13 are
It rotates greatly in conjunction with the rotation of the cam wheel 9,
The tape in the cassette is pulled out once and for all by the tape guide 14 and ten leg pin 15 provided on these, and after the tape is pulled out, the loading ring 7 rotates to load the tape onto a predetermined tape running path. That is, as shown in FIG. 2, the tape 16 pulled out from the mounted tape cassette 1 is transferred from the supply reel on the supply reel stand 4 to the tape end detector 17, tape guide 18, ten-leg pin 15, full-width erasing head 19, and input tape. The tape passes through the side tape guide 20 and is wrapped around the rotary head drum 21 while being inclined downward.

Then, while tilting further downward, the output side tape guide 22, the ACE (audio control/erase) head attached to the ACE head attachment adjustment device 23, the tape guides (not shown) in front and behind it, the vicinity of the capstan 24, and the low The tape passes through the pinch roller 25 on the loading ring 7 and is reversed by the tape guide 26a also on the loading ring 7. At this position, the tape 16 is at its lowest position, and then rises to the pinch roller 25 and the tape guide 26 also on the loading ring 7.
b, 26c, 26d, tape drawer arm 1
The tape 16 is wound onto a take-up reel on a take-up reel stand 5 through two tape guides 14, and is loaded along a predetermined running path.

Note that the tape running drive device 28 driven by the reel motor 27 swings its head in accordance with the rotation direction of the reel motor 27, and its drive gear meshes with the reel stand gear of the take-up reel stand or the supply reel stand 4, and It is an oscillating type that rotates the reel stand. Also, numeral 29 is a capstan motor, 30
is a guide roller of the loading ring 7.

(Description of a drive device including a differential gear device) As shown in FIGS. 3 to 6, a worm wheel 34 meshing with a worm shaft 33 of a loading motor 32 fixed on a chassis 41 is integrated with the worm shaft 33 of a loading motor 32 fixed on a chassis 41. It is rotatably mounted on a vertical shaft 36 on the chassis 41 with a first gear 35 formed therein. This first gear 35 is meshed with a third gear 39 via a second gear 38 which is also rotatably attached to a vertical shaft 37 on the chassis 41. The third gear 39 is fixed to a rotating shaft 40 of the differential gear device 6 so as to rotate together with the rotating shaft 40, and the lower part of the rotating shaft 40 is connected to a chassis 41 and a bearing 42 provided on the chassis 31. It is rotatably supported by. Further, a first sun gear 43 is fixed to the upper part of the rotating shaft 40, and a first sun gear 43 that rotates independently of the rotating shaft 40 is provided between the first sun gear 43 and the bearing 42. 4 gears 44 are fitted. The flange 45 of the fourth gear 44 is provided with two fixing pins 46 at positions facing each other with respect to the center of rotation thereof.
has a planetary gear 47 that meshes with the first sun gear 43.
are each mounted rotatably. Also, rotation axis 4
0 has internal teeth 48 that mesh with the planetary gear 47.
A second sun gear 49 having a second sun gear 49 is rotatably mounted independently of the rotating shaft 40 . The boss 50 of this second sun gear 49 is connected to the chassis 31.
It is supported by a bearing 52 provided on a support plate 51 fixed above through a support column (not shown), and the protruding boss 50 has a boss 50 that engages with the notch and rotates together with the bearing 52. 5 gears 53 are provided.

A sixth gear 55 that meshes with the fifth gear 53 and the ring gear driving gear 8 that meshes with the ring gear 56 of the loading ring 7 are integrally rotatably mounted on the fixed shaft 54 of the support plate 51. installed. On the other hand, the cam wheel 9 having teeth 9a meshing with the fourth gear 44 is fixed to the cam wheel shaft 10 and is supported by a bearing 58 on the chassis 31 and a bearing 57 on the support plate 51. There is.

With the above configuration, the rotational force transmitted from the loading motor 32 to the first sun gear 43 of the rotating shaft 40 via the gear reduction device is transmitted to the ring gear 5 of the loading ring 7, for example.
6 is locked, from the planetary gear 47 via the fourth gear 44, i.e. from this fourth gear 4.
4 is the output shaft, and is transmitted to the cam wheel 9.
On the other hand, when the cam wheel 9 is locked,
The information is transmitted from the planetary gear 47 to the second sun gear 49 via the internal teeth 48, and in this case, the second sun gear 49 serves as the output shaft, and the fifth, sixth and ring gear drive gears 53, 55 and A ring gear 56 is rotationally driven through the ring gear 8.

In this way, the loading ring gear 5 is connected from one loading motor 32 via the differential gear device 6 depending on which one the locking mechanism locks.
6 or cam wheel 9 are independently and continuously driven to rotate.

Note that this shaft 10 is attached to the upper part of the cam wheel shaft 10.
The tape pull-out arm 12 is rotatably mounted, and the cam switch 11 is mounted at the lower part thereof. Further, a first cam groove is formed on the upper surface of the cam wheel 9, and second and third cam grooves are formed on the lower surface.

(Description of tape drawer) The tape drawer will be explained with reference to FIGS. 7 and 8. As shown in FIG. 7, an engagement pin 62 of a cam lever 61 is engaged with a first cam groove 60 formed on the upper surface of the cam wheel 9, and as the cam wheel 9 rotates, this cam lever 6
1 rotates around a common fulcrum shaft 3 with the positioning pin of the cassette 1. And this cam lever 6
1, a balance gear drive lever 63 and a tape pull-out arm drive lever 64, which are also rotatable about the fulcrum shaft 3, are connected to each other via a connection pin 65. Therefore, the ten-legged drive lever 63 and the tape pull-out arm drive lever 64 are rotated in conjunction with the first cam groove 60 of the cam wheel 9.

A sector gear 66 is formed at the tip of the tape pull-out arm drive lever 64, and idle gears 67, 68 that mesh with this are rotatably attached to a support shaft on the support plate 51 (FIG. 4). ing.
A tape pull-out arm 12 is rotatably attached to the upper part of the cam wheel shaft 10.
At the center of this rotation is a gear 69 that is integrated with the arm 12.
is provided. Since this gear 69 is meshed with the idle gear 68, the tape pull-out arm 12 is moved by the tape pull-out arm drive lever 6.
4 rotates around the shaft 10 via these gears. Note that a tape guide 14 that projects upward is provided at the tip of the tape pull-out arm 12.

On the other hand, a ring lock lever 70 is provided at the bottom of the loading ring 7 on the chassis, and this lock lever 70 is urged to rotate clockwise around a fulcrum pin 71 by a spring 72. Lock pin 73 protruding from
is engaged with the engagement hole 74 of the loading ring 7 to lock the loading ring 7. Also provided on the chassis is an arm stopper 76 that rotates around a fulcrum pin 75.
It is connected to the ring lock lever 70 via a connecting pin 77 and is configured to interlock with the ring lock lever 70. An engagement piece 78 is provided upwardly projecting at a predetermined position of the ring lock lever 70, and a notch 79 is formed at a predetermined position of the arm stopper 76.

Next, as shown in FIG. 8, a step-shaped engaging pawl A80 and an engaging pawl B81 are formed on the outer periphery of the cam wheel 9, and at a predetermined rotational position, the engaging pawl A80 is centered around the fulcrum shaft 3. The engaging claw 83 of the neutral lever 82 that is rotated engages with the engaging claw B81, and the engaging claw 85 of the unloading lever 84 and the eject lever 86 (FIG. 7) engage with the engaging claw B81. It is configured. Note that the neutral lever 82 and the unloading lever 84 are connected to each other via a tension spring 87.

In FIG. 8, reference numeral 88 is a ring stop pole fixed substantially vertically to a predetermined position on the chassis 31, and reference numeral 89 is a stop pin protruding downward substantially perpendicularly to a predetermined position of the loading ring 7. It is.

(Description of the balance gear device) Next, the balance gear device will be explained with reference to FIGS. 7, 8, 14, and 15.

As shown in FIG. 7, the balance gear drive lever 63, which rotates around the fulcrum shaft 3 in conjunction with the first cam groove 60 of the cam wheel 9, is connected to a sector gear 92 via a connecting rod 91. . This sector gear 9
2 is rotatably attached to a fulcrum shaft 93 fixed on the chassis 31, and this sector gear 92 meshes with a sector gear 95 which is also rotatable around a fulcrum shaft 94 on the chassis. As shown in FIGS. 14 and 15, the long lever 96 at the top
and a short lever 97 at the bottom are integrally connected in a U-shape, and is rotatably attached to a fulcrum shaft 94 of a sector gear 95. A band brake lever 101 is rotatably attached to the same fulcrum shaft 94 between the levers 96 and 97, which is integrally formed of a cylindrical member 98, a vertical plate 100 that connects the lever 99 and the spring. ing. The tensile gear arm 13 and the band brake lever 101 are connected by an upper tension spring 102, and both have this tension spring 102 on the tension side.
The pressing surface 96a of the long lever 96 and the pressing surface 100a of the vertical plate 100 come into contact with each other on the compression side (in the direction in which they press each other) and press the other side. are configured to work together. and band brake lever 1
A band brake 104 is applied to the supply reel stand 4 from a pin 103 at the tip of the band brake lever 101, and a tension spring 105 urges the band brake lever 101 to rotate in the direction in which the band brake 104 applies the brake. Further, a driving pin 106 is protruded from the sector gear 95, and this pin 10
6 is a short lever 97 of the ten-leg gear arm 13 and the band brake lever 1, as shown in FIG.
It is interposed with the lever 99 of 01 with the required play. This pin 106 presses the short lever 97 of the ten-leg gear arm 13 when the sector gear 95 is rotated forward in the direction to pull out the tape, and on the contrary, presses the lever 99 of the band brake lever 101 when the sector gear 95 is rotated back in the return direction. do,
It is configured to rotate both levers, respectively. It should be noted that at the tip of the long lever 96 of the balance gear arm 13, the balance gear pin 15 is provided substantially vertically upward.

The stop lever 107 in FIG. 8 is rotatably attached to the fulcrum shaft 93, and when the band brake lever 101 rotates toward the tape drawer side, as shown in FIG. 107 and rotate it, this stop lever 107
The other end comes into contact with the pinch press lever 108, thereby preventing further forward rotation of the band brake lever 101. When the pinch pressing lever 108 rotates to press the pinch roller 25 against the capstan 24, that is, in the FWD mode, the stop lever 107 becomes free.

As described above, the tensile gear arm 13 and the band brake lever 101 have a tension spring 102 on the tension side.
Because they are connected through the , they normally rotate together, but they can rotate independently if necessary. That is, during tape loading, the ten-leg gear arm 13 is connected to the ten-leg gear drive lever 63 and the connecting rod 9.
1. It is rotated counterclockwise around the fulcrum pin 94 via the sector gears 92 and 95, etc. At this time, the band brake lever 101 is
is also rotated counterclockwise, but the band brake lever 101 is rotated counterclockwise together with the stop lever 107.
Even if it comes into contact with and stops, the balance gear arm 13 can be further rotated forward to a predetermined first position while stretching the spring 102 (FIG. 10). Therefore, the pinch roller 25 on the loading ring 7
The tape guides 26a to 26d, etc. can rotate and load the tape without being interfered with by the tensile gear arm 13.

After the loading ring 7 has finished rotating, the ten-leg gear arm 13 is moved to the ten-leg gear drive lever 6.
The spring 102 which had been stretched due to the return rotation of step 3
is restored and rotated back to a predetermined second position (FIG. 12). When the FWD button is pressed and the pinch press lever 108 is rotated as shown by the imaginary line in FIG.
becomes free, and the rotational force of the band brake lever 101 due to the tension spring 105 and the rotational force of the balance gear arm 13 due to the tape are balanced, and the balance gear arm 13 also becomes free with respect to the pin 106. Therefore, when the tape tension decreases during FWD, the band brake lever 101 is rotated counterclockwise by the tension spring 105, so that the band brake 104 is forced and the tape tension is increased. When the tape tension becomes higher, the tensile gear arm 13 is rotated clockwise, so the band brake lever 101 is also rotated clockwise and the band brake 104 is loosened. In this way, the braking force of the supply reel stand 4 is automatically tensioned, and the tension of the tape 16 is always adjusted to a constant tension state.

(Description of Unloading Brake) Next, the unloading brake will be described with reference to FIGS. 9 and 16.

As shown in FIG. 16, the unloading brake lever 110 is bent into a stepped shape, and has a fulcrum pin 111 fixed on the chassis 31.
It is rotatably mounted on the Teeth 113 that mesh with the reel stand gear 112 of the supply reel stand 4 are formed at one end thereof. Further, a slip gear 114 that meshes with the ring gear 56 of the loading ring 7 is rotatably inserted into the upper part of the fulcrum pin 111.
14 and the unloading brake lever 110 are frictionally coupled by a friction plate 115 interposed therebetween and a compression spring 116 fitted to the lower part of the fulcrum pin 111. Note that the reference numeral 117 shown in FIG. 16 is a soft brake fixed to the chassis 31 and rotatably attached to a fulcrum pin 118.

With the above structure, when the loading ring 7 rotates, the slip gear 114 is rotationally driven by the ring gear 56. Since the slip gear 114 and the unloading brake lever 110 are frictionally connected, the lever 110 is also rotated about the fulcrum pin 111. However, during loading, the rotating direction is clockwise in FIG. 9, so the teeth 113 do not mesh with the reel base gear 112 as shown in FIG. (not shown), and only the slip gear 114 is idling. However, when unloading, brake lever 1
10 is rotated counterclockwise, so the tooth 1 at the tip
13 meshes with the supply reel stand gear 112, and the supply reel stand 4 is braked. Even when the rotation of the loading ring 7 ends and the rotation of the slip gear is stopped, this braking state continues.
Therefore, during unloading, the tape is wound onto the take-up reel by the reel motor 27, but since the supply reel stand is braked during this time, the tape on the supply reel is never wound onto the take-up reel. .

Then, just before the end of the unloading brake, the unloading brake lever 110 is rotated clockwise by the protruding piece 119 provided on the connecting rod 91 that rotates the balance gear arm 13 back, and the brake is released (seventh figure).

(Description of Brake Device, Pinch Roller Pressing Device, etc.) The outline of the brake device, pinch roller pressing device, etc. will be explained below with reference to FIG.

The engagement pin 1 of the main lever 122 is inserted into the second cam groove 121 formed on the back surface of the cam wheel 9.
23 is engaged, and rotates about a fulcrum pin 124 on the chassis in conjunction with the rotation of the cam wheel 9. In addition, a brake lever 126 is provided in the third cam groove 125 formed on the back surface of the cam wheel 9.
An engagement pin 127 is engaged with the cam wheel 9, and the brake lever 126 is configured to rotate about the fulcrum pin 124 in response to the rotation of the cam wheel 9, and the brake lever 126 is further engaged with a soft brake 128. ing.

On the other hand, at one end of an L-shaped ring stop lever 131 which is biased to rotate clockwise by a tension spring 130 around a fulcrum pin 129, there is a vertical pin 132 which is pressed against the main lever 122.
is provided. A rotatable ring stop roller 133 is provided at the other end of the ring stop lever 131, and the end is further connected to a slider 135 via a pin 134. The slider 135 is configured to reciprocate up and down in FIG. 8, and its protruding piece 136 presses the main brakes 137, 138 to turn off the brakes against a tension spring 139.

The pin 140 at the upper end of the main lever 122 is
It is loosely fitted into a long hole 142 formed at one end of a connecting rod 141, and the other end of this connecting rod 141 is connected to the pinch press lever 108. The pinch press lever 108 is urged to rotate clockwise around a fulcrum pin 144 on the chassis by a tension spring 143, and when pulled by the connecting rod 141, it rotates counterclockwise against the spring 143. The pinch roller 25 is pressed against the capstan 24 by the pressing piece 145.

Reference numeral 146 is a soft brake lever operated by a spring (not shown), which is connected to the connecting rod 141.
The projecting piece 147 is configured to be released in a predetermined mode.

Note that the main lever 122, brake lever 126, ring stop lever 131, shown in FIG.
The neutral lever 82, the unloading lever 84, the slider 135, the connecting rod 141, etc. are all arranged below the loading ring 7.

(Description of operation of the device) When the tape cassette 1 is loaded from the stump van state shown in FIGS. 7 and 8, and this loading is detected, the loading motor 32 starts rotating in the forward direction and the differential gear device 6 starts rotating. Driven. However, in this standby state, since the loading ring 7 is locked by the ring lock lever 70 as described above, the cam wheel 9 is first rotated in the direction of the arrow a. In this standby state,
The main lever 122 that engages with and interlocks with the second cam groove 121 of the cam wheel 9 has already been rotated counterclockwise about the fulcrum pin 124, and the ring stop lever 131 adjacent to it has already been rotated counterclockwise about the fulcrum pin 124.
is pushed by this and rotated counterclockwise about the fulcrum pin 129. Therefore, the slider 135 interlocks with this ring stop lever 131.
moves downward in FIG. 8, and the supply reel stand 4
and the main brake 137,1 of the take-up reel stand 5
38 is turned off. The off-state of the main brakes 137 and 138 continues even when the cam wheel 9 is rotated in the direction of arrow a until a time described later. On the other hand, when the cam wheel 9 rotates in the direction of arrow a, the first cam groove 6 of this cam wheel 9
The tape pull-out arm 12, which is linked to the first cam groove 60, is rotated clockwise through the gears 66 to 69 about the cam wheel shaft 10, and the ten-leg drive lever is also linked to the first cam groove 60. 63 is also rotated counterclockwise around the fulcrum shaft 3. From this balance gear drive lever 63, the balance gear arm 13 is further rotated counterclockwise about a fulcrum shaft 94 via a connecting rod 91, a sector gear 92, etc. Therefore, the tape 16 of the tape cassette 1 mounted on the supply reel stand 4 and take-up reel stand 5 is pulled out by the guide roller 14 on the tape pull-out arm 12 and the tension pin 15 on the tension arm 13 (the ninth figure).
Then, at the first position where the tape pull-out arm 12 is pulled out even further, the ring lock lever 70 hits the engagement piece 78 of the ring lock lever 70, so that the ring lock lever 70 moves counterclockwise around the fulcrum pin 71 against the spring 72. The loading ring 7 is unlocked. At the same time, the engaging claw 83 of the neutral lever 82 rotates around the fulcrum shaft 3.
engages with the engaging pawl A80 formed on the outer periphery of the cam wheel 9, so the rotation of the cam wheel 9 in the direction of the arrow a is stopped (Figs. 10 and 11).
figure). Therefore, the output from the differential gear device 6 is transmitted to the ring drive gear 8, and the loading ring 7 is rotationally driven in the direction of arrow b. Then, the guide roller 26a, pinch roller 25, guide rollers 26b, 26c, and 26d on the loading ring 7 sequentially move to hook the pulled-out tape, thereby wrapping the tape on a predetermined path.

Before the loading ring 7 rotates in this way, the tape 16 is pulled out from the cassette 1, and as shown in FIG. Since the guide rollers 26a to 2 have been rotated greatly forward to the position 1, the guide rollers 26a to 2
6d and the pinch roller 25 can move together with the loading ring without any hindrance and can load the tape.

Next, the rotated stop pin 89 of the loading ring 7 moves the neutral lever 82 to the ring stop pole 8 on the chassis, as shown in FIG.
8, the rotation of the loading ring 7 is stopped. Since the neutral lever 82 pressed at the same time is rotated clockwise around the fulcrum shaft 3, the unloading lever 84 connected to it via the spring 87 is rotated toward the cam wheel 9. , the engagement between the cam wheel 9 and the neutral lever 82 is released, and the cam wheel 9 becomes free. Therefore, next, the output from the loading motor 32 is transmitted to the cam wheel 9, and the cam wheel 9 is again driven to rotate in the direction of the arrow a. The main lever 122, which had been rotated counterclockwise about the fulcrum pin 124 and turned off the main brakes 137 and 138 as described above, is now the second lever of the cam wheel 9.
Since the ring stop lever 131 is rotated clockwise by the cam groove 121, the ring stop lever 131 is rotated back. For this reason, the main brakes 137 and 138 are turned on to prevent the tape from loosening due to inertia, and the ring stop roller 133 of the ring stop lever 131 engages with the engagement hole of the loading ring 7 to prevent loading. ring 7
lock. Meanwhile, at this time, the brake lever 126 that engages with and interlocks with the third cam groove 125 of the cam wheel 9 is rotated counterclockwise about the fulcrum pin 124, and the main brakes 137, 138
Turn off. At the same time, the tape pull-out arm 12 and the ten-legged arm 13, which have been fully rotated and pulled out, are returned to the predetermined second position shown in FIG. 12, and the tape pull-out arm 1
2 is a stop pin 149 protruding below the stop pin 149;
is locked by engaging with the notch 79 of the arm stopper 76. When the return operation of the arm begins, the cam switch 11 provided on the cam wheel shaft 10 that rotates together with the cam wheel 9 is activated, the reel motor 27 is rotated, and the loosened tape is wound up. When the arms 12 and 13 reach a predetermined second position, the reel motor 27 is stopped by the cam switch 11, and the brake lever 126 is rotated clockwise to rotate the main brakes 137 and 138.
is turned on, the loading motor 32 is stopped, and loading is completed to enter the stop mode. Note that the soft brake 146 remains applied during tape loading.

As explained above, the tape pull-out arm 12 and the ten-legged arm 13, which have been fully pulled out to the first position, are removed from the loading ring 7.
When the rotation of the holder is completed, the holder is returned to a predetermined second position. In other words, in the tape pull-out arm 12, the angle at which the tape is wound around the tape guide 14 of this arm 12 is returned to the minimum position allowed, so even though the tape is wound at an angle, the tape There is little frictional contact of the tape in the guide 14, and the tape runs smoothly.

In addition, in the tensile gear arm 13, the band brake lever 101 changes from the individually extended state.
Since it is returned to the position where it is linked with the tape tension, it is possible to fully utilize the original function of the balance gear, which responds sensitively to the tension of the tape.

Next, stop mode after loading (12th
13) to each mode is also performed by the cam wheel 9. For example, when a FWD (constant speed driving) operation button is pressed, the loading motor 32 rotates forward and the cam wheel 9 is rotationally driven in the direction of arrow a in FIG. 7. Therefore, the main lever 122 is further rotated clockwise by the second cam groove 121, so that the connecting rod 141 interlocked with the main lever 122 is
Moved to the right in the figure. The pinch press lever 108 connected to this connecting rod 141 is
As shown by the chain line in FIG. 13, the fulcrum pin 14
4, and the pressing piece 145 provided on the pressing lever 108 presses the pinch roller 25 against the capstan 24. At this time, the soft brake 146 is released by the protruding piece 147 of the connecting rod 141. At this time, as the cam wheel 9 rotates, the brake lever 126 is rotated counterclockwise about the fulcrum pin 124, so the main brakes 137 and 138 are turned off. At the same time, the cam switch 11 is actuated to start the reel motor 27 and capstan motor 29, and the tape is brought into a constant speed running state.

When the stop button is pressed, the reel motor 27 and capstan motor 29 are stopped, and the loading motor 32 is reversely rotated to rotate the cam wheel 9 in the direction of arrow c.
The loading motor 32 stops at the position where it returns to the stop mode position again. Therefore, the main brakes 137, 138 are braked again at this position.

For example, when the RVS button for switching from stop mode is pressed, the cam wheel 9 rotates forward in the direction of arrow a, and the cam wheel 9
It rotates from the position to this RVS position and stops. Therefore, as in the case of FWD, the pinch roller 25 is pressed against the capstan 24, and the brake lever 126 is largely rotated counterclockwise to turn off the main brakes 137, 138. Turn on the soft brake 128. Then, the reel motor 27 and the capstan motor 29 are switched to FWD by the signal from the cam switch 11.
The tape rotates in the opposite direction to enter the RVS state, and the soft brake 128 ensures stable running of the tape.

Next, tape unloading is the opposite operation to the above-mentioned loading, but includes some operations specific to unloading. When the eject button is pressed from the stop mode, the loading motor 32 is reversed. In FIGS. 12 and 13, since the loading ring 7 is locked by the ring stop lever 131 at this time, the cam wheel 9 is first rotated in the direction of arrow c. As the cam wheel 9 rotates in the c direction, the brake lever 126 is rotated and the main brakes 137 and 138 are turned off.
Tape drawer arm 12 and ten leg gear arm 13
is rotated forward to the fully opened first position. At this time, the engagement claw 85 of the unloading lever 84 is engaged with the engagement claw B8 on the outer periphery of the cam wheel 9.
1, the cam wheel 9 is locked at this position, and the main lever 122 is rotated counterclockwise, causing the ring stopper lever 131 to rotate.
is rotated counterclockwise, the loading ring 7 is unlocked and becomes free, and at the same time, the main brakes 137 and 138 are also turned off (brake lever 126 is rotated back). Therefore, the loading ring 7 is now rotated in the direction of the arrow d, but at the same time the cam switch 11 is activated and the reel motor 27 is activated, which drives the take-up reel stand 5 to rotate and remove the slack tape. is rewound onto the take-up reel. At this time, as described above, the slip gear 114 is driven from the ring gear 56 of the loading ring 7, and the unloading brake lever 110 is engaged with the supply reel stand gear 112, so the supply reel stand 4 is braked, and during this time, the supply reel The tape is never wound onto the take-up reel.

In this way, when unloading the tape, both the tape pull-out arm 12 and the tension gear arm 13 are rotated forward to the first position before the loading ring 7 rotates, so that the loading ring 7 can be rotated in the same way as when loading the tape. The guides above 7 can be moved without any problem.

And stop pin 8 of loading ring 7
9 is the unloading lever 8 as shown in FIG.
4 is pressed against the ring stop pole 88 on the chassis, the loading ring 7 is stopped and the engagement between the unloading lever 84 and the cam wheel 9 is released. Accordingly, the cam wheel 9 becomes free and rotates again in the direction of arrow c, so that the tape pull-out arm 12 and the tension gear arm 13 are rotated back and stored in their original positions. Immediately before this, the unloading brake lever 110 is released by the protruding piece 119 of the connecting rod 91, and the reel motor 27 is stopped by the cam switch 11, thereby completing the tape unloading. However, the cam wheel 9 similarly rotates further in the direction of arrow c, and the engaging pawl B81 on the outer periphery of the cam wheel 9 presses the eject lever 86, so the tape cassette 1 is ejected and the loading motor 32 is stopped once. do. After detecting this ejection, the loading motor 32 rotates slightly forward in the direction of arrow a.
Return to standby position and stop.

Since the cam wheel 9 is thus reversed to a point beyond the standby cam position, auto-ejection is possible. Therefore, after ejecting, it is necessary to rotate the motor in the normal direction to return the cam wheel 9 to the standby position.

Effects of the Invention As explained above, according to the present invention, the tape is first pulled out from the attached tape cassette to a predetermined position by the tape pull-out member, and after this pull-out, the tape is further pulled out by the tape guide on the loading ring. Since it is constructed so that it can be pulled out and stretched along a predetermined tape running path, loading of the tape in the small cassette can be easily and smoothly carried out.

Further, according to the present invention, since one motor is configured to rotate the loading ring and drive the tape pull-out member through the differential gear device, the drive device can be downsized and the device can be This is extremely advantageous in reducing the overall size. Furthermore, although the two operations described above are driven by one motor, they are performed independently via the lock mechanism, so that reliable and highly reliable operations are guaranteed.

[Brief explanation of drawings]

The figure shows the present invention using a small tape cassette.
This shows an embodiment applied to a tape loading device for a VTR. Fig. 1 is an overall plan view showing the standby state before loading, and Fig. 2 is an overall plan view in stop mode after loading. , FIG. 3 is a plan view of the drive device, FIG. 4 is a sectional view taken along the - line in FIG. 3, FIG. 5 is an exploded perspective view of the drive device, and FIG. 6 is an exploded perspective view of the differential gear device. FIG. 7 is a plan view of the mechanism mainly interlocking with the first cam groove in standby mode, FIG. 8 is a plan view of the mechanism mainly interlocking with the second and third cam grooves in standby mode, and FIG. 7 is a plan view showing the tape being pulled out from the state shown in FIG. 7, FIG. 10 is a plan view showing the state in which the tape is fully pulled out from the state shown in FIG. 7 and the loading ring has started rotating, and FIG. FIG. 12 is a plan view in the same state as in FIG. 10, FIG. 12 is a plan view in stop mode after loading is completed from the state in FIG. 7, and FIG. 13 is a plan view in the same state as in FIG. 12 in FIG. , FIG. 14 is a perspective view of the balance gear, FIG. 15 is an exploded perspective view of the balance gear, and FIG. 16 is a cross-sectional view of FIG. In addition, in the symbols used in the drawings, 1... Tape cassette, 6... Differential gear device, 7... Loading ring, 8... Ring gear drive gear, 9
... Cam wheel, 12 ... Tape drawer arm, 16 ... Tape, 32 ... Loading motor, 70 ... Ring lock lever (first lock mechanism), 131 ... Ring stop lever (first
(lock mechanism), 80, 81... Engaging claws A, B (second lock mechanism), 82... Neutral lever (second lock mechanism), 83... Engaging claw (second lock mechanism) ), 84... unloading lever (second lock mechanism), 85... engaging claw (second lock mechanism).

Claims (1)

[Claims] 1 A differential gear device driven by a motor, a loading ring driven from one output shaft of this differential gear device, a first locking mechanism that locks this loading ring in a predetermined position, and the above-mentioned It is equipped with a tape drawer member driven from the other output shaft of the differential gear device and a second lock mechanism that locks the tape drawer member in a predetermined position, and when a tape cassette is attached, the motor rotates in the normal direction. First, the tape pull-out member pulls out the tape to a predetermined position, and after this pull-out, the loading ring rotates, and the tape guide provided on the loading ring pulls out the tape further to draw out the tape to a predetermined position. A tape loading device characterized by being configured to span along a traveling route.