JPS6350783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus in which a magnetic tape is pulled out from a tape cassette and mounted on a magnetic head drum, and thereafter various modes are switched to perform desired recording and reproducing operations. Regarding the drive switching device, in particular, a single drive source is used to drive the tape mounting means for mounting the magnetic tape on the magnetic head drum and the operation mode switching means for switching the mechanism mode such as recording/playback or fast forward/rewind. It is an object of the present invention to provide a drive switching device that operates in coordination with each other by switching, thereby reducing the size and weight of the device, reducing consumption, and ensuring reliable operation of the device mechanism.

In the tape mounting means of a magnetic recording and reproducing device that generally uses a tape cassette, or the operation mode switching means for recording and reproduction, one method is to use dedicated motors for each of the tape mounting means and the operation mode switching means. , a type that performs each operation, another method is a type that uses a dedicated motor for the former and a number of electromagnets for the latter, and another method uses a dedicated motor for the former and a tape mounting means. A type has been devised in which the tape mounting means is provided with a cam portion to switch between various modes. In these conventional methods, the tape mounting means and the operation mode switching means each require a dedicated motor or a drive source such as an electromagnet, and therefore it is not possible to reduce the size and weight of the apparatus. Also, since multiple drive sources are required,
Particularly in the case of portable models, low power consumption cannot be expected, resulting in drawbacks in terms of long-term shooting.

Furthermore, in the case of a structure that uses a cam, the structure mechanism is very complex and has a large number of parts, and there are problems with assembly work, assembly accuracy, and durability. It could not be said to be sufficient as it lacked accuracy.

The present invention can accurately and cooperatively switch two mechanical means by switching their loads with one drive source,
It is an object of the present invention to provide a drive switching device that achieves reduction in size and weight of the device, improvement in assembly workability, etc. of the device, and allows stable and accurate operation of the device mechanism.

An embodiment of the drive switching device according to the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a device board, 2 is a motor pulley for driving a capstan, and is connected to a capstan 5 fixed to the flywheel 4 via a belt 3 and a flywheel 4. In FIG. 6 is a pinch roller that presses the magnetic tape 21 against the capstan 5; 7 is an arm for the pinch roller rotatably connected to a shaft erected on the substrate 1; this arm 7 is connected to an operation mode switching means 14 (to be described later); (not shown), and the pinch roller 6 is connected to the capstan 5 only in the recording/playback mode.
It is configured to press against the Reference numeral 8 denotes a running post, and the magnetic tape 21 is wound around the running post 8 only when the pinch roller 6 presses the capstan 5. 9 is a cassette, and inside the cassette 9 are a take-up reel 10 and a supply reel 1.
1 and a plurality of posts 32 and 33 are provided. Reference numeral 12 denotes a center pulley for driving a reel, which is provided at a position approximately midway between a supply reel stand 35 and a take-up reel stand 36, which will be described later. Due to the movement of , the drive idler 13 comes into contact with the center pulley 12 , and the center pulley 12
For example, during rewinding, the center pulley 12 rotates in the counterclockwise direction of arrow A, so the idler 13 is deflected counterclockwise due to frictional force and moved to the position 13'. Also, during winding, the center pulley 12 moves in the direction of arrow B.
Due to the clockwise direction of rotation, the idler 13
deflects clockwise and moves to the 13'' position, applying the rotational force of the center pulley 12 to each supply reel 1.
1 and the take-up reel 10. Reference numerals 15 and 16 denote a main ring and a sub-ring constituting the tape mounting means 37, each of which has a toothed portion formed on its outer periphery to be coupled to a first output portion 18 of a planetary gear unit portion 38, which will be described later. . 1
Reference numeral 7 designates a plurality of regulating rings for supporting the main ring 15 and the sub-ring 16. 19
is a second output section of the planetary gear unit section 38, and this second output section 19 is meshed with the tooth forming section of the operation mode switching means 14. 20 is a tension servo lever that rotates the magnetic tape 2 in recording/playback mode.
1 and performs back tension of the magnetic tape 21.

22 is a magnetic head drum incorporating at least one magnetic head 39, 23 is an audio control head, 24 is an audio erase head, and 25 is a full erase head. A tape drawer post 26 is led by the main ring 15, and is located in the recess 34 of the cassette 9 before operation, and moves to the position 26' when the magnetic tape 21 is completely loaded.

Reference numerals 27, 28, and 29 denote a plurality of correction posts provided on the sub-ring 16, which are provided as a unit on the correction table 54, which will be described later. 27', 2 when the magnetic tape 21 is fully loaded.
Move to the positions shown at 8' and 29'. Although not shown in the drawings, the correction table 54 is configured so that its connection position with respect to the sub-ring 16 changes just before the movement ends, and the advancing side part changes slightly so that it opens.
This is effective in reducing the size of the device or reducing the amount of the recessed portion 34 of the cassette 9, thereby reducing the size of the cassette. Reference numerals 30 and 31 are regulating posts that regulate the entrance and exit positions of the magnetic tape 21 on the magnetic head drum 22.

FIG. 2 illustrates the planetary gear unit section 38. 40 is a worm directly connected to a motor (not shown) which is a driving source that rotates in forward and reverse directions; 41 is a worm wheel gear that meshes with the worm 40;
It is rotatably coupled to a shaft 42 provided on a unit stand 43 fixed to the base plate 1, and the engagement described above achieves prevention of reverse rotation. Further, a tooth portion 44 is provided in a part of the worm wheel gear 41,
It constitutes a sun gear 52. 45 is the above shaft 42
A planetary gear rotatably connected to a shaft 46 provided on a part of an arm gear 47, which is also rotatably connected to the sun gear 52. It meshes with the internal teeth 53 of an internal gear 48 which is rotatably connected to a part of the internal gear 52 . 49 is a shaft supporting the first output section 18 of the planetary gear unit section 38;
The first output section 18 is connected to the arm gear 4 on the other hand.
7, and the main ring 1 on the other hand.
5. It meshes with the sub-ring 16 with a diameter difference.
As is clear from FIG. 1, the difference in diameter between the main ring 15 and the sub-ring 16 is provided between the tape pull-out post 26 and the correction posts 27, 28,
This is because the amount of rotational movement of the 29 groups is different, and therefore the main ring 15 and the sub-ring 16 are given a difference in diameter to form a differential gear configuration. Reference numeral 50 denotes a shaft that supports the second output section 19 of the planetary gear unit section 38, and the second output section 19 meshes with the external teeth 51 of the internal gear 48 on one side, and on the other hand, is used for switching the operation mode. It meshes with the means 14. The planetary gear unit section 38 is constituted by the gear section described above.

3 and 4 are detailed views of the tape drawer post 26 and correction posts 27, 28, and 29 described above. Reference numeral 54 denotes a correction table, on the top of which correction posts 27, 28, and 29 stand up at respective correction angles, and on the other hand, a biasing plate spring 55 is coupled to the bottom surface of the table, and holds the sub-ring 16 mentioned above. ing. As described above, the correction table 54 can move somewhat, but in order to absorb the looseness of the movement, the sub ring 16 and the correction table 54 are coupled with a spring (not shown). 56 is a main boat on which the tape drawer post 26 is placed and fixed, and the groove 62 of the sub ring 16
A bearing portion 61 thereof is provided so as to penetrate therethrough. A grip hand 57 is integrally fixed to the main boat 56 and moves along a guide plate 64 which is held in a spiral shape with respect to the plane of the board 1 by a plurality of support plates 63 fixed to the board 1. , is connected by a connecting member 56 via a shaft 60 to a connecting member 59 fixed to the main ring 15, and the main boat 56 is pulled by the connecting member 58 connected to the main ring 15 when rotating. , the magnetic tape 21 is moved along a guide plate 64 provided in a spiral shape to mount the magnetic tape 21 at a predetermined position.

Next, the magnetic tape drive mechanism shown in FIGS. 5 to 7 will be explained. In FIG. 5, the operation mode switching means 14 is meshed with the second output section 19 of the planetary gear unit section 38 through teeth provided on a part thereof, and is held by a shaft 65. Further, a part of the operation mode switching means 14 is connected to the cassette storage section 67.
(The whole is not shown, only the hooked part is shown.)
A pin 69 fixed to a locking means 66 for locking the
The first elastic members 68 are connected to each other so as to be attracted to each other by a first elastic member 68. First elastic member 68
The initial tension is the first tension of the planetary gear unit portion 38.
It is set to a value larger than the moving operation load of the tape mounting means 37 applied to the output section 18 of. 70
is a hook portion provided on a part of the locking means 66, and is configured to lock the cassette storage portion 67 when the locking means 66 rotates in the direction of arrow C. Reference numeral 71 represents a stopper portion that restricts rotation of the locking means 66, and reference numeral 72 represents a shaft that holds the locking means 66. A second elastic member 73 is engaged with a portion of the locking means 66 on one side and coupled to the substrate 1 on the other side, and has the same initial tension as the first elastic member 68. Reference numeral 74 denotes an arm provided on a part of the locking means 66, which is configured to push a switch (not shown) when the locking means 66 rotates in the direction of arrow C. This locking means 66 is configured to operate integrally with the operation mode switching means 14 until a part thereof contacts the stopper portion 71, and after it contacts the stopper portion 71, only the operation mode switching means 14 operates. ing. A cam portion 75 is formed in a part of the operation mode switching means 14, and a contact ring 78 fixed to a direction changing lever 76 that rotates around a shaft 77 comes into contact with the cam portion 75.
The operation mode switching means 14 is configured to rotate in the direction of arrow E in response to movement in the direction of arrow D. Reference numeral 79 denotes a slide plate, a part of which engages with the direction changing lever 76 to operate integrally, and is configured to move in the direction of the arrow F in response to rotation of the direction changing lever 76 in the direction of the arrow E. ing. Although not shown, the movement of this slide plate 79 releases the reel stand brake means. 80 is a shaft that holds the slide plate 79, and 83 is a return spring that returns the slide plate 79 from the operating state and brings the contact ring 78 of the direction change lever 76 into contact with the cam portion 75 of the operation mode switching means 14. It also has the effect of Reference numeral 82 designates an idler arm having a stepped groove 87 in a part thereof, and a shaft 81 having a slide groove 84 is fixed to the other side of the idler arm 82 as shown in FIG.
4 engages with the groove 86 of the slide plate 79 and is movable. Further, a shaft 85 is fixed to the center of the stepped groove 87 of the idler arm 82, and the drive idler 13 is rotatably fitted onto the shaft 85. Further, on the side of the center pulley 12 of the idler arm 82, as shown in detail in FIGS. 6 and 7, there is a recessed portion having a radius substantially the same as or larger than that of the elastic body ring 89 integrally connected to the center pulley 12. 90 is formed. This recess 90 is formed when the drive idler 13 moves toward the center pulley 12 during operation.
3 contacts the elastic body ring before contacting the center pulley 12, and if the center pulley 12 is rotating to the left or right, the drive idler 13 is deflected in the direction of rotation, and the center pulley 12 is stopped. If it is, the elastic body ring 89 and the recess 90 are engaged with each other so that the drive idler 13 is held at the neutral position without being deflected to either the left or right. 8
Reference numeral 9 denotes a balance plate, one of which is engaged with a stepped groove 87 of the idler arm 82, and the other of which is engaged with an arm 92 of the slide plate 79 via a spring 91. Also, the idler arm 8 mentioned above
2. The center pulley 12 and the spring 91 are arranged in a straight line so that the drive idler 13 always presses against the center pulley 12 during operation. Further, reference numeral 93 in FIG. 1 is a stop member at the end for regulating the start and end ends of the tape mounting means 37, and a micro switch or the like may be used at the start end.

Next, the operating state of the above configuration will be explained in the following order. 1, 5, and 9 show the locked state of the cassette storage section 67, then FIG. 9 shows the loaded state of the magnetic tape 21, and then FIG. 10 shows the stopped state. Fig. 11 shows the recording/playback state, and Fig. 12 shows the winding and fast forwarding state.
Next, the cassette removal state will be explained with reference to FIGS. 13 and 5. First, the locking of the cassette storage section 67 will be explained with reference to FIGS. 1, 5, and 9.
When the cassette 9 is installed in the cassette storage section 67 before the device is operated, when some operation is performed, for example, a recording/reproduction switch is turned on, the drive source of the planetary gear unit 38 rotates in the forward direction, and the drive source of the planetary gear unit 38 rotates in the forward direction. The worm 40 rotates. One side of the rotation is the sun gear 52, the planet gear 45, and the arm gear 47.
The other signal is transmitted to the first output section 18 via the sun gear 52, the planetary gear 45, and the internal gear 48 to the second output section 19. At this time, the first output section 18 of the planetary gear unit section 38
The load of the tape mounting means 37 is applied to the second output part 19, and the second
Although the restoring force of the elastic member 73 is applied, the load on the tape mounting means 37 becomes relatively larger.
The driving force of the planetary gear unit 38 is transmitted to the second output section 19, and moves the operation mode switching means 14 and the locking means 66 integrally in the directions of arrows C and D, respectively.

Therefore, as shown in FIG. 9, the hook portion 70 of the locking means 66 engages with the cassette storage portion 67, and the direction changing lever 76 is rotated in the direction of arrow E by the cam portion 75 of the operation mode switching means 14.
The slide plate 79 engaged with the direction changing lever 76 is moved in the direction of arrow F against the spring 83, and the reel stand brake means is released. At this time, since the center pulley 12 of the drive idler 13 is not rotating, the recess 9 of the idler arm 82 described above
0 is an elastic body ring 8 fixed to a center pulley 12
9 is pressed by a spring 91, the drive idler 13 is not deflected and is held in the pressed state, that is, in the neutral position, and the reel stands 35 and 36 are in a free state. As the movement progresses further and a part of the locking means 66 comes into contact with the stopper part 71, the restoring force of the second elastic member 73 ceases to act, and the second output part 19 of the planetary gear unit part 38 described above
The load of the first elastic member 68 acts on. Since this load is larger than the operating load of the tape mounting means 37 applied to the first output section 18, the driving force of the planetary gear unit section 38 is switched from the second output section 19 to the first output section 18. communicated.

Next, the operation from the tape loaded state to the stopped state will be explained with reference to FIGS. 1, 9, and 10. When the driving force of the planetary gear unit 38 is switched from the second output section 19 to the first output section 18, the main ring 15 and the sub-ring 15 constituting the tape mounting means 37 connected to the first output section 18 ring 16
The magnetic tape 21 is rotated in the direction of arrow G in FIG.
3. The magnetic tape 21 is sequentially mounted on the audio erase head 24, the full erase head 25, and the posts 30 and 31. At this time, since the main ring 15 and the sub ring 16 have a differential gear configuration, the main ring 15 rotates faster than the sub ring 16. Further, the brake means on the reel stands 35 and 36 are also released, and the drive idler 13 is not deflected and is held at a neutral position, so that the magnetic tape 21 is smoothly and easily drawn out from the cassette 9.
Then, as the rotation progresses further and the tape pull-out post 26 and the correction posts 27, 28, 29 are moved to predetermined positions, and the rotation is blocked by the stop member 93, the planetary gear unit portion 38
The operating load applied to the first output portion 18 of is rapidly increased and becomes larger than the load of the first elastic member 68 . When the magnitude of the load is reversed, the driving force of the planetary gear unit 38 is transferred to the first output section 18 again.
The operating mode switching means 1 is switched and transmitted to the second output part 19 and is coupled to the second output part 19.
4 against the first elastic member 68,
It reaches the stop state shown in FIG. 10 and is stopped by a position detection switch (not shown). At this time, the drive idler 13 is released from the neutral position shown in FIG. 9 and returns to its original state, and the reel stand 3
5 and 36 are also acted on by braking means.

Next, the recording and reproducing state will be explained with reference to FIG.
When either the recording or reproducing switch (mechanism operation is the same) is turned on from the stop state shown in FIG. 19, and the operation mode switching means 14 is further switched to the arrow
It is moved in the D' direction and the position detection switch is activated to stop it in the state shown in Fig. 11. At this time, since the direction changing lever 76 is rotated in the direction of the arrow E, the slide plate 79 moves in the direction of the arrow F, and the drive idler 13 also comes into contact with the center pulley 12. At this time, since the center pulley 12 is rotating in the direction of arrow B, the elastic body ring 89 of the center pulley 12
A recess 9 provided in the idler arm 82 by
The drive idler 13 is biased by the spring 91 and wedges between the center pulley 12 and the take-up reel stand 36, and the rotation of the center pulley 12 is deflected toward the take-up reel stand 36. 36. At this time, the brake means is released by the slide plate 79, and the pinch roller 6 is turned off by the operation mode switching means 14.
The magnetic tape 21 is pressed against the capstan 5, and the tension servo lever 20 is also operated, and the magnetic tape 21 is slowly wound onto the take-up reel for recording or reproducing operation. When changing from the recording or playback state to the stop state, when the stop switch is turned on, the drive source of the planetary gear unit 38 rotates in the opposite direction, and its output is transmitted to the first elastic member 68.
acts as a restoring force, the load on the second output section 19 is lighter than that on the first output section 18, and the driving force is transmitted to the second output section 19 as a reverse operation. The operation mode switching means 14 connected to the switch 19 is moved in the direction of the arrow D'', and the switch stops in the state shown in FIG. to return to.

Next, rewinding and fast forwarding will be explained. Since these two mechanical operations are the same, and only the direction of rotation of the center pulley 12 is different, the unwinding state will be explained with reference to FIG. 12. First, when the rewind switch is turned on, the drive source of the planetary gear unit 38 rotates in the opposite direction, and the driving force is transferred to the second output for the same reason as when moving from the recording/reproducing state to the stop state. 19, and the second
Operation mode switching means 14 coupled to the output section 19 of
is moved in the direction of arrow D'' and stopped in the state shown in FIG. , the drive idler 13 also comes into contact with the center pulley 12.

At this time, since the center pulley 12 rotates in the direction of arrow A, the recess 9 of the idler arm 82 comes into contact with the elastic body ring 89 provided on the center pulley 12.
0 is kicked in the direction of arrow A, and the idler arm 82
The drive idler 13 provided at can perform actions. To change from this rewind operation to the stop state, press the stop switch.
When turned ON, the drive source of the planetary gear unit 38 rotates in the forward direction, and its driving force is also transferred to the second
The operation mode switching means 14 connected to the second output section 19 is moved in the direction of arrow D', the position detection switch is operated, and the first
It returns to the state shown in Figure 0 and stops, and the drive idler 13 also returns.

Next, the cassette removal process will be explained with reference to FIGS. 13 and 5. When the cassette eject switch is turned ON from the stop state shown in FIG.
is applied as a restoring force, and the load on the second output section 19 is smaller than that on the first output section 18.
The operation mode switching means 14 coupled to the second output part 19 moves in the direction of arrow D'', and the pin 69 fixed to the locking means 66 moves in the direction of arrow D''.
as shown in Fig. 13. When abutting, the return force of the first elastic member 68 disappears, and the load of the second elastic member 73 acts on the second output section 19 of the planetary gear unit section 38, so that the second output section 19 of the planetary gear unit section 38 The load on the second output section 19 is greater than the load on the first output section 18 . Therefore, the driving force of the planetary gear unit 38 is switched to the first output section 18, and the tape mounting means 37 connected to the first output section 18 is switched to the first output section 18.
Move it in the direction of arrow H in the figure. At the same time, the movement of the cam portion 75 of the operation mode switching means 14 causes the direction conversion lever 76 and the slide plate 79 to move in the directions of arrows E and F, respectively. Therefore, the drive idler 13 also comes into contact with the center pulley 12 as it moves towards it.

At this time, since the center pulley 12 is rotating in the direction of the arrow A, the recess 90 of the idler arm 82 that is in contact with the elastic ring 89 provided on the center pulley 12 is kicked in the direction of the arrow A. The provided drive idler 13 is energized by a spring 91 to connect the center pulley 12 and the supply reel stand 3.
5, the rotation of the center pulley 12 is transmitted to the supply reel stand 35, and the tape mounting means 3
Magnetic tape 2 generated because 7 returns in the direction of arrow H
The magnetic tape 21 is wound up to absorb the slack of the magnetic tape 21.

As these operations proceed further, the magnetic tape 21 is completely wound up in the cassette 9, and the magnetic tape 21 is completely wound onto the tape mounting means 3.
7 is prevented from moving by the stop member 93, the load applied to the first output section 18 of the planetary gear unit 38 increases rapidly and becomes larger than the load on the second elastic member 73. . Then, the driving force of the planetary gear unit 38 is transferred to the first output section 1.
8 to the second output section 19, and the operation mode switching means 14 changes from the state shown in FIG. 13 to the state shown in FIG.
and the locking means 66 are integrally connected to the second elastic member 7.
3, and stopped at the position by the position detection switch. When moving from the state shown in FIG. 13 to the state shown in FIG. 5, the cam portion 7 of the operation mode switching means 14
5, the drive idler 13 returns to its original position, and at the same time, the cassette storage section 67 is unlocked, and the cassette 9
can be taken out.

As described above, the present invention has the following effects.

(i) Since the magnetic tape mounting means and the operation mode switching means can be driven in good coordination with each other by switching the load using one drive source, the mechanical configuration can be simplified and consolidated. Because of this, there are fewer components, which is effective in reducing the size and weight of the device.

(ii) Since the configuration is simplified in item (i), the operation of the mechanism can be adjusted by itself, its assembly and adjustment can be made into a unit, and it is easy to do so, and there is no need to adjust the timing between the mechanisms.

(iii) In item (ii), since assembly and adjustment can be performed as a unit, the accuracy of each mechanism operation is improved and the reliability of the device is also improved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the overall configuration of the embodiment of the present invention, Figure 2
The figure is an explanatory diagram of the structure of the planetary gear unit, Figures 3~
Fig. 4 is a partial detailed view of the tape mounting means, Fig. 5 is a configuration diagram of the tape drive unit before the device operates, Figs. 6 to 8 are partial explanatory views thereof, and Fig. 9 is the tape mounting state. 10 is an explanatory diagram of the driving unit in the stop state. FIG. 11 is an explanatory diagram of the driving unit in recording and reproducing mode.
This figure is an explanatory view of the drive unit showing the winding state in the winding fast-forward mode, and FIG. 13 is an explanatory view of the drive unit during the cassette unloading process. 14... Operation mode switching means, 18... First output section, 19... Second output section, 26... Tape drawer post (main post), 27, 28, 29... Correction post (sub post), 38... Planetary gear Unit part, 6
8...First elastic member, 93...Stop member.

Claims (1)

[Claims] 1 A planetary gear unit section having first and second output sections, a tape mounting means on which a magnetic tape draw-out post is placed and coupled to the first output section of the planetary gear unit section, and the planetary gear unit section. load greater than the load on the operation mode switching means coupled to the second output section of the unit and the tape mounting means latched to the operation mode switching means and further coupled to the first output section of the planetary gear unit section. A drive switching device for a magnetic recording/reproducing device comprising an elastic member having an initial tension and a stop member regulating the rotation range of the tape mounting means.