JPH045115Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an adapter for a small tape cassette, which is used, for example, when loading a small tape cassette smaller than a standard type tape cassette into a standard type recording/playback device. .

(Prior Art) When using a small tape cassette used in a recording/playback device such as a video tape recorder in a recording/playback device into which the small tape cassette is loaded, an adapter is needed to convert the small tape cassette into a standard type tape cassette. It becomes necessary. This adapter may simply serve as a housing if the tape path of the small tape cassette is formed the same as the tape path of a standard type tape cassette. However, since it is the same as the tape path of a standard type tape cassette, it is not that small. Therefore, in order to make a small tape cassette substantially smaller, the tape path of the small tape cassette is different from the tape path of a standard type tape cassette, so that, for example, the supply side reel and the take-up side in the small tape cassette are different from each other. By making the distance from the reel smaller than that of the standard type, and by using an adapter that has approximately the same external shape as the standard type tape cassette, the tape path of the small tape cassette can be made standard. It must be converted so that it can be applied to the type of recording/playback device.

The present applicant has developed a compact tape cassette that is substantially smaller than the standard type that has previously achieved this purpose, and a system that enables recording and playback using a standard recording and playback device that uses this small tape cassette and the standard tape cassette. The application has been filed for an adapter for small tape cassettes (hereinafter sometimes referred to as an adapter for short). (Japanese Patent Application No. 57-92965) In other words, the small tape cassette loaded in the storage section of this adapter can form a tape path that is substantially the same as that of a standard type tape cassette by means of the internal guiding means. It is also configured to rewind the drawn out tape into a small tape cassette.

In addition, the applicant has developed a built-in motor that operates the tape loading mechanism, thereby eliminating the need for tape loading and unloading operations that are performed by manually rotating a knob, and improving operability. We proposed an adapter for small tape cassettes with improved performance.
No. 62948). This adapter includes a release knob that unlocks the lid when closed and covers the top of the small tape cassette, and a release knob that is operated in one direction to initiate tape loading operation and in the other direction. Two operating knobs are provided, including a tape loading/tape unloading operating knob that is operated to initiate a tape unloading operation.

For this reason, not only does the operating mechanism become complicated, but
As the number of operations increases, for example, erroneous operations such as accidentally operating the operation knob for unlocking the lid that should not be operated during tape unloading (in this case, the tape unloading operation is not performed) , the lid may open unnecessarily). Furthermore, if the lid is opened just before the end of unloading and the operator removes the cassette at the same time as the lid is opened, the loading arm (or pole)
Not only does the tape stop midway and cannot be returned to its initial (regular) position, but the tape is not completely stored in the small tape cassette and remains pulled out, resulting in damage to the tape. If an attempt was made to load a small tape cassette into the adapter in this half-finished state, not only would it not be possible to set it up properly, but the tape would also be damaged.

(Purpose of the invention) The present invention was made to solve the above-mentioned problems, and its purpose is to prevent the lid of the small tape cassette adapter from being removed by the operator just before the end of tape unloading. Even if the lid is forcibly opened and a small tape cassette is taken out from the adapter, the loading arm always returns to its initial position and is always maintained in the optimal condition for loading the next small tape cassette. This invention provides an adapter for small tape cassettes.

(Structure of the invention) In order to achieve the above-mentioned object, the present invention has a storage part C that stores a small tape cassette B that is smaller than the standard type, and a lid part that covers the upper surface of the small tape cassette stored with the lid closed. 68, the tape is moved in one direction to perform a tape loading operation to form a tape path corresponding to the front side tape path of a standard type tape cassette, and is moved in the opposite direction to form said tape path. a tape loading mechanism that performs a tape unloading operation for storing the tape in the small tape cassette;
A small tape cassette adapter used in a standard type tape cassette magnetic recording and reproducing device includes: a motor 11 that drives the tape loading mechanism; a power supply section 74 that supplies power to the motor; and the power supply section 74. one of the pair of power supply terminals b, a connected to one electrode side of the power supply unit, and the other power supply terminal a of the pair connected to the other electrode side of the power supply unit
b, and a pair of movable pieces that are switched and connected to one power terminal and the other power terminal and are connected to each power terminal of the motor 11, and when the lid portion is closed, the pair of movable pieces a second detection means comprising a pair of switches SW2 and SW3 which are switchably connected to the one power supply terminal and the other power supply terminal; a second detection means which is connected between the one power supply terminal of the pair of switches SW2 and SW3; a first detection means SW1 for detecting the small tape cassette B stored in the storage section; and a first detection means SW1 connected between the other power terminals of the pair of switches SW2 and SW3, which detects the tape loading end position of the loading mechanism; It consists of third detection means SW4 and SW5 that detect the unloading end position and cut off the power supply to the motor 11, and when the lid part 68 is closed, the first detection means
A drive circuit for the motor 11 in the loading direction is formed by switching the pair of movable pieces of the second detection means and the third detection means, and when the lid portion 68 is opened from the closed state, Second
switching of the pair of movable pieces of the detection means and the third
The present invention provides an adapter for a small tape cassette characterized in that a drive circuit for the motor 11 in the unloading direction is formed by the detecting means.

(Example) Fig. 1 is a schematic plan view showing a state in which the upper half of an embodiment of the small-sized tape cassette adapter according to the present invention is removed, and Fig. 2 shows a small-sized tape cassette adapter housed in the adapter shown in Fig. 1. An external perspective view showing an example of a tape cassette, FIGS. 3 to 6 are partial explanatory views of the components, FIG. 7 is a circuit diagram showing the motor drive circuit in the adapter, and FIG. 8 is a small tape according to the present invention. FIG. 9 is a perspective view of the outer appearance of the cassette adapter with the lid opened, and FIG. 9 is a bottom view of the adapter.

In each figure, a small tape cassette adapter (hereinafter referred to as adapter) A has an outer shape that is substantially the same as a standard type tape cassette, and has an opening in which an upper half 2, a lower half 3, and a tape path are formed. An adapter housing 1 is formed by a rotary opening/closing front lid 4 which is stretched by a coil spring so as to close the lid. A storage section C corresponding to the shape and accommodating it is provided. As is clear from FIG. 8, a through hole 6 is formed around the storage portion C to allow the L-shaped hook portion 67 of the lid portion 68 to enter therein. A part of the locking mechanism of the operating knob 56 is shown. In addition, 5 is the lower half 3 in the storage part C.
This allows the small tape cassette B stored in the storage section C to be taken out by pushing up the bottom surface of the cassette with a finger or the like from below.

The small tape cassette B is as shown in Figure 2.
A cassette housing 6 and a magnetic tape 40 which is rotatably provided on the front side of the cassette housing 6 and is normally closed.
The frame body is constituted by the lid 7 that protects the.

Reference numerals 8 and 9 denote a take-up tape reel and a supply tape reel arranged in the frame, and one take-up tape reel 8 has an output gear of a second gear group E in an adapter A, which will be described later. A gear 10 is attached which meshes with the gear and drives the gear to rotate.

First, the tape loading and unloading operations within the adapter A will be described. Each operation is performed by interaction between the operating knob, related mechanisms, and motor drive circuits, which will be described later.

The configuration is such that a tape loading operation and a tape unloading operation are performed by a motor 11 built into the adapter A via a first gear group D and a second gear group E.

That is, the tape loading operation is shown in FIGS. 1 and 3.
To explain this in conjunction with the figure, when the motor 11 rotates forward, the driving force of the motor 11 is applied to the worm 1 on this shaft.
2 to the worm wheel 13, which is the input gear of the first gear group D. This worm wheel 13 is constantly pressed by a coil spring 16 so as to be integrally connected to a gear 15 via a friction plate 14. The rotational force of the gear 15 is transmitted to the gear 17, and then to the gear 20 at the lower part of the gear structure 19 via the gear 18 integrated therewith, and the gear structure 19 is rotationally driven in the clockwise direction.

The upper part of the gear structure 19 has a protrusion 21 thereon.
A gear 22 is provided, and a recess 23 for manual operation is formed on the top surface of the adapter A, and faces the top surface of the adapter A. Therefore, loading and unloading is also possible by inserting a coin or the like into the recess 23 and turning the gear structure 19 independently. Gear 20 of gear structure 19
As a result of this rotation, the special chain 27 connected to the pin 20a of the gear 20 is wound up, and the loading arm 25 is rotated clockwise with respect to the shaft 26 to the position shown by the double-dot chain in FIG. move.

On the other hand, the gear 24 that meshes with the gear 22 of the gear structure 19 is rotated counterclockwise, and a pair of upper and lower cams 28a and 28b provided on the gear 24 is applied with a spring. A pair of lock arms 29
a and 29b rotate in the same direction as the loading arm 25 against the force of the spring to the position shown by the two-dot chain in FIG. 1, thereby self-holding the pole 30 of the loading arm 25. .

Also, due to the rotation of the loading arm 25,
At the bottom of the operation knob 56 mentioned above, and at the adapter A
The connecting rod 31 arranged in the longitudinal direction moves in the X ₁ direction, and connects another connecting rod 33 arranged on the left side of the storage section C that moves up and down via the bell crank 32 in the Y ₁ direction.
direction (upward). That is, the power of the first gear group D operates the connecting rod 33 via the connecting rod 31 that bypasses the storage section C. This connecting rod 33
As a result of the movement of the cam 34, the operation of the cam 34 is transmitted to another loading arm 35, and the loading arm 35 rotates counterclockwise in FIG. Further, the tip cam portion 33a of the connecting rod 33 holds the pole 39 of the loading arm 35 by rotating the lock lever 37 counterclockwise about the shaft 38, which is biased clockwise by a spring. .

Note that 75 is a substantially triangular protrusion piece that cooperates with the connecting rod 33, and as the connecting rod 33 moves upward ( _Y1 direction), a pin and a protrusion (not shown) implanted in the connecting rod 33 are removed. By engaging with a cam groove (not shown) of a well-known shape formed inside the piece 75, it is rotated clockwise and stored in the adapter A, and during unloading, which will be described later, as shown by the solid line in FIG. , which protrudes from the side surface of the adapter A and functions as a stopper to prevent the tape cassette B from being inserted into the apparatus in the unloaded state.

The magnetic tape 40 of the small tape cassette B whose poles 30 and 39 are stored in the storage section C by the rotation of the pair of loading arms 25 and 35 mentioned above.
is pulled out, a tape loading operation is performed within adapter A, and a tape path 41 corresponding to the front side tape path of a standard type tape cassette is formed. As a result, the protruding piece 75 is attached to the adapter A.
stored inside.

Furthermore, as the gear structure 19 rotates, the movable pieces of the switches SW4 and SW5 are switched by the action of the protrusion 21 on the gear 22, as will be described later.

The protrusion 21 is configured in the shape of a pair of arms in the figure due to the molding of the gear structure 19, but the shape is not limited to this, and the key is to move the switches SW4 and SW5 according to the rotational position. All you have to do is switch the pressure alternately. That is, the protrusion 2 of the gear structure 19 at the tape unloading rotation position
The stopping position of No. 1 is the lower position shown by the solid line in FIG.
5 is turned off as described later.

Also, during tape loading, the protrusion 21 shown by the solid line moves away from the switch SW5 and rotates clockwise, and then when the quick loading is completed, it moves to the position shown by the two-dot chain line and turns the switch.
Press only SW4 to turn it off. To put it more clearly, both switches SW4,
When SW5 is inactive (a state in the middle of loading when the protrusion is not in contact with anything), it is in the ON state, and these states will be easily understood from the operations of each part described later.

During tape loading, as shown in FIGS. 3 and 4, a coil spring 44 is used to press the space between the gear 17 of the first gear group D and the coaxial gear 42 from the gear 42 side. A one-way clutch 43 having a well-known mechanism is inserted.
This clutch 43 is used during tape loading.
Since the rotational force of the gear 18 is operated in the escape direction between the rotational force of the gear 18 and the gear 42, the power to the gear 52 on the tension arm 47, which will be described later, is cut off. It has a function of transmitting information to the gear 42. That is, this unidirectional clutch 43 obtains an appropriate tape tension by utilizing the rotational force of the second gear group E when pulling out the magnetic tape 40 from the small tape cassette B during tape loading operation. It is for.

Also, the gear 4 on the tension arm 47
9 and 52 are the first
Since it is in mesh with the second gear group D and E at the same time, it is possible to prevent the tape from becoming excessively loose.

Next, the tape unloading operation will be explained.

When the motor 11 reverses, the gear structure 19 rotates counterclockwise via each gear of the first gear group D, and the lock arms 29a, 2 rotate accordingly.
9b rotates counterclockwise to release the lock of the loading arm 25, and the timing is slightly different from this rotation, and the loading arm 25 rotates counterclockwise and comes into contact with the stopper pin 45.
It comes to rest at the position shown by the solid line in Figure 1. When the loading arm 25 rotates, a connecting rod 31 connects the pin 25a of this arm and the through hole 31d.
is carried in the direction of arrow _X2 and moves the other connecting rod 33 in the direction of _Y2 (downward) via the bell crank 32, thereby causing the lock arm 37 to rotate clockwise by its self-returning force. Since the loading arm 35 which moves and cooperates with the lock is released, the loading arm 35 rotates clockwise along with the operation of the cam 34 and comes to rest at the position shown by the solid line in FIG.

On the other hand, as described above, the rotational force of the gear 17 of the first gear group D is transmitted to the gear 42 via the unidirectional clutch 43 as shown in FIG.
The clutch shaft has a fulcrum, and the rotational force is transmitted to a gear 49 serving as an input gear of a second gear group E provided on a shaft 48 of a displaceable tension arm 47 biased by a spring 46. be done. The gear 49 is pressed by a coil spring 51 via a friction plate 50 to drive a gear 52 which is integrally driven. This gear 5
The rotating force of No. 2 is generated by the gear 53a of the reel structure 53,
Since the gear 10 of the small tape cassette B is rotated via the reel drive gear 55 integrated with the gear 54, the take-up side tape reel 8 rotates in the tape winding direction. As a result, the magnetic tape 40 forming the tape path 41 is wound and stored in the small tape cassette B, and tape unloading is performed.

In addition, when unloading the tape, the motor 11
As described above, the gears 17 and 42 are simultaneously rotated by the unidirectional clutch 43, so that the rotation speed of the loading arm 25 driven by each gear via the gear 17 is and gear 42
By relatively shifting the rotational speed of each gear that operates during the tape winding operation using the friction plate 50 inserted between the gear 49 and the gear 52, the magnetic tape 40 can be adjusted appropriately. The tape is wound into the small tape cassette B with a certain tension.

Next, the configuration and operation of each part of the adapter A will be explained one by one by item.

(1) Operation knob and related mechanisms (see Figures 5A to D, 6 and 10) The operation knob 56 is located on the upper half 2 of the adapter A and corresponds to the storage section C. It is provided so as to be slidable in both directions of positions X ₁ and X ₂ , and the operation knob 56 is located at the tenth position.
As shown exploded in the figure, it is generally formed integrally with an upper operating section 57, a lower locking section 58, and an arm section 59 that connects the two.

Reference numeral 60 denotes a locking member for the operation knob 56 formed into a substantially L shape by a guide portion 61 and a locking portion 62 hanging from the rear end of the guide portion 61. It is inserted between the lower locking part 58 and its elongated hole 61a is slidable in both directions X ₁ and X ₂ using the arm part 59 as a guide.

Lower locking portion 58 integrated with these upper operation portions 57
Although the widths of the main bodies of the intermediate guide portions 61 superimposed therebetween are approximately the same, the lower locking portion has a tip portion 58c having a tapered surface protruding from the width direction.
is formed. And the guide section 61 above it
The tip portion 61b is formed to protrude from the width direction so as to cover the tapered surface of the tip portion 58 in a protruding state, and both tip portions 58c and 61b are inserted into the through hole 76 shown in FIG. 8 as described above. Therefore, although the tip portions 58c and 61b correspond to the hook portion 67 of the lid portion 68, when the lid portion 68 is in the open state shown in FIG. 67, but the other tip portion 61b is in a position retracted from this hook portion 67.

Further, the lower locking portion 58 of the operation knob 56 is provided with a protrusion 58a that hangs down from the lower locking portion 58.
This protrusion 58a has a locking portion 6 of the locking member 60.
A coil spring 63 is stretched between the adapter 2 and the adapter A to draw them together, and a coil spring 64 is stretched between the adapter A and the adapter A. Note that the spring constant of the coil spring 63 is smaller than that of the coil spring 64. That is, setting the spring constants of the pair of coil springs 63 and 64 in this way prevents the lid of the adapter A from opening during the unloading process by operating the operation knob 56, which will be described later. It's for a reason.

65 is a displacement member integrally formed with a base 65a and a switch operating portion 65b protruding downward from the base 65a and toward the front side in the width direction, and the base 65a is connected to the tip of the lower locking portion 58 of the operating knob 56. While disposed within the recess 58b, it can be displaced downward by elastic means such as a leaf spring 66.

The width of the base portion 65a is such that it protrudes in the width direction from the tip of each portion such as the guide portion 61, so when the lid portion 68 is closed, the hook portion that enters through the through hole 76. 67 and is displaced downward.

31 is the loading arm 25 as mentioned above.
It is a connecting rod that slides in both directions X ₁ and X ₂ by
The specific shape is as shown in FIG.
Pins 31a and 31b are provided protruding from the center elongated hole 31c and near both ends so as to be guided by the pins and grooves (none of which are shown), and lock the locking portion 62 of the locking member 60. Projection 31
e is provided. Further, the pin 31f is for locking the bell crank 32, and all of the protrusions of the connecting rod 31 such as these pins protrude in the same direction.

As shown in FIG. installed inside.

In the unloading state, the connecting rod 31 is connected to the fifth
As shown in FIG _.
It is something that stays still while being taken in a direction.

To explain the operation of each member here, adapter A
When the lid portion 68 that closes the storage section C is in the open state shown in FIG. 8, the operation knob 56 and the displacement member 65 are in the state shown in FIG. 5A, respectively.

Place the small tape cassette B shown in FIG.
When the cassette is stored in a corresponding manner, a cassette detection switch SW1, which will be described later, is closed. Thereafter, when the lid part 68 is closed, the hook part 67 engages the tip part 58 of the lower locking part 58 of the operation knob 56 through the through hole 76.
The lower locking portion (operation knob) 5 slides on the tapered surface of c and resists the force of the coil spring 64.
8 is retracted in the _X2 direction, and when the hook 67 passes the tip 58c, the tip 58c moves back in the _X1 direction due to the elastic restoring force, and the hook 6
7 is temporarily locked, and the displacement member 65 is pressed against the elastic force of the leaf spring 66, thereby pressing the pair of switches SW2 and SW3 to start loading. This state is shown in FIG. 5B. Due to this loading, as described above, the loading arm 25 carries the connecting rod 31 in the _X1 direction, and due to the clockwise rotation of the gear 22, the protrusion 21 that had been pressing the switch SW5 is moved to the other switch SW4. Press to finish loading. {At this time, the protrusion 31e of the connecting rod 31
comes to rest at the position shown in FIG. 5C} This state is also shown in FIG. 11A. This FIG. 11 is a side view of the state shown in FIG. 5 when viewed from the direction of arrow T in FIG. It is shown.

During this loading, due to the movement of the connecting rod 31, the locking member 60 causes the tip 61b of the guide portion 61 to enter the hook portion 67 due to the self-returning force of the coil spring 63, as shown in FIG. One end (right side) of the elongated hole 61a comes into contact with the arm portion 59 of the operation knob 56 and becomes stationary. In other words, the hook portion 67 of the lid portion 68 is doubly locked by the operation knob 56 and the locking member 60. Therefore, in this loading state, even if the operation knob 56 is operated in the lid opening direction ( _X2 direction), unloading will only start, and the lid part 68 of the adapter A will be locked to the guide part 61 of the locking member 60. The lid cannot be opened easily.

Next, the operation for taking out cassette B will be explained. To take out the cassette B from the loading state shown in _FIG . 60 together in the _X2 direction, and its tip 58c moves to the position. Due to the movement of the operation knob 56, the displacement member 65 comes to rest so as to fit within the tip recess 58b of the lower locking portion 58 of the operation knob 56 due to the return force of the leaf spring 66, as shown in FIGS. 5D and 11B. As it moves upward to the position, it separates from switch SW2 and switch SW and switches these respectively.
At the same time, the end of the base 65a comes into contact with the hook 67.

Therefore, even if the operating force of the operating knob 56 in the X2 direction is released in this state, the operating knob 56 tends to be pushed back in the _X1 direction by the elastic restoring force of the coil spring 64, but the hook of the base 65a It remains stationary at that position due to contact with the portion 67. This switch
Unloading is started by switching SW2 and switch SW3. At this time, the tip of the lower locking part 58 of the operation knob 56 comes off from the hook part 67 of the lid part 68, but the guide part 61 of the locking member 60
The tip portion 61b of the hook portion 67 is still engaged with the hook portion 67.

As mentioned above, the connecting rod 31 is moved from the position shown in FIG. 5C by the return of the loading arm 25.
_X2 direction, and as _{shown in} FIG. reach. The connecting rod 31 further moves in the _X2 direction, but as mentioned above, the spring constant of the coil spring 63 stretched between the operating knob 56 and the lock member 60 is set lower than that of the other coil springs 64. , the connecting rod 31 connects the locking portion 62 of the locking member 60 to the coil spring 63 by its projection 31e.
Only the locking member 60 is brought to the position _P3 against the force of the chisel. At this time, the tip 61b of the locking member 60 reaches the position _Q1 (the end surface of the hook 67), and the locking state of the hook 67 of the lid 68 is completely released, resulting in the state A in FIG. Therefore, the lid portion 68 is opened upward by the coil spring S shown in FIG. 8, and the cassette B can be taken out.

(2) Tension arm mechanism The tension arm 47 having gears 49 and 52 supported on a shaft 48 is shown in FIGS. 1, 3 and 4.
As shown in the figure, one end is a unidirectional clutch 43.
The other end is supported by the shaft 69 of the adapter A.
It is rotatably supported at the end of a link 71 having an inner shaft 70 as a fulcrum. Further, this tension arm 47 is biased with clockwise rotational force by a coil spring 46, and gears 49 and 52 are connected to gears 43 and 53 during loading and unloading, respectively. They are always engaged. That is, in this loading state, as described above, the power of the second gear group that drives the gear 10 of the cassette B by the unidirectional clutch 43 is cut off. As a result, during loading, the tape is pulled out while resisting the frictional force of the friction plate 50, so that when loading is completed,
Appropriate tension is given to the tape. Also,
During unloading, the second gear group E is rotated together with the first gear group by the action of the clutch 43, but the friction plate 50 between the gears 49 and 52 rotates the second gear group D and the second gear group. A relative speed is given between the magnetic tape 41 and the gear group E, so that the magnetic tape 41 is wound onto the take-up tape reel 8 with an appropriate tension.

Further, the link 71 is provided with a projection 71a at a portion into which a reel brake release pin of a standard type cassette is inserted. Therefore, cassette B
When the adapter A containing the adapter A is loaded into a recording/reproducing device (not shown) in a loading state with a predetermined tape path formed, the brake release pin 72 in the device is released.
(shown in FIG. 1) is the protrusion 71a of the link 71.
is pressed to displace (rotate) it clockwise, and at the same time, the tension arm 47, which is pivotally supported by this link 71, is rotated counterclockwise. As the tension arm 47 rotates, the power between the first gear group D and the second gear group E that drives the take-up tape reel 8 of the cassette B is cut off, so that the tape running is not driven by the recording/reproducing device. No extra load is applied to the system, the magnetic tape 40 runs smoothly and stably, and good recording and reproducing conditions are maintained.

(3) Motor drive circuit (see FIG. 7) A motor drive circuit shown in FIG. 7 including switches SW1 to SW5 is incorporated in the adapter A.
The drive source for the motor 11 is built in the adapter A and is driven by a storage battery 74 (shown in FIG. 1) or the like.

In FIGS. 1 and 7, switch SW1, which is the first detection means, is a switch for detecting the storage state of a small tape cassette, and switches SW2 and
It is arranged between contacts b and a connected to the negative polarity (-side) side of SW3, and this is a lever that is displaced on the cassette surface when the small tape cassette B is loaded into the storage section C. It is pressed at 73 and becomes conductive.

In FIG. 5 and FIG. 7, the second detection means, switch SW2 and switch SW3, are a pair of detection switches that detect the state of the lid portion 68 as described above. As shown in FIGS. 5B and 5C, the SW 3 is selectively switched to the a side when the lid 68 is closed and is pressed through the displacement member 65, and they also move the operation knob 56 to the When the lid is opened to move to the state shown in FIG. 5D, the displacement member 65 is displaced upward, and the movable pieces of both switches SW2 and SW3 are selectively switched to the b side.
That is, the movable pieces of the interlocking switches SW2 and SW3 are connected to both terminals of the motor 11, and the other contacts b, b (or a, a) are always connected to the storage battery (power supply).
74 so that the polarities are opposite to each other. In the embodiment, the contact b of the switch SW2 and the contact a of the switch SW3 have negative polarity (- side),
Further, contact a of SW2 and contact b of SW3 are connected to positive polarity (+ side), respectively.

Further, the third detection means, switch SW4 and switch SW5, are switches for detecting the loading end and unloading end states, as shown in FIGS. They can be connected in series via the + side contact and are always on (normally closed). That is, one switch
When the loading arms 25, 35 are in the position shown by the solid line (at the end of unloading), SW4 is in the ON state because it is not pressed by the protrusion 21 on the gear 22 of the gear structure 19. Furthermore, when the loading arm 25 has been rotated clockwise from the position shown by the solid line in FIG.
It becomes OFF.

Further, the switch SW5 is activated when the unloading operation is completed when the lid portion 68 is opened.
4, it is pressed by the protrusion 21 on the gear 22 of the gear structure 19 and becomes in the OFF state.

FIG. 7D shows the state of the circuit when the lid portion 68 is opened and the tape cassette B is not housed, as shown in FIG. 8.

In this state, when the cassette B is stored in the storage section within the adapter A, the switch SW1 becomes conductive.
Then, as shown in FIG. 5B, when the cover 68 of the adapter A is closed, the switch SW2 and the switch
SW3 is pressed by the hook portion 67 via the displacement member 65, and each movable piece is switched to the side a, resulting in the state shown by the solid line in FIG. 7A, and the switch SW3,
Since a current path is formed by the switch SW1, the storage battery 74, the switch SW4, and the switch SW2, the motor 11 is driven to rotate normally and tape loading is started. At the same time as this tape loading starts, the switch SW5 moves away from the protrusion 21 on the gear 22 of the gear structure 19, as shown by the two-dot chain line.
The OFF state becomes the ON state as shown by the solid line, and the loading arm 25 rotates clockwise via the first gear group D.

When the loading arm 25 reaches the loading end position, the protrusion 21 of the gear 22 of the gear structure 19 presses the switch SW4 to turn it OFF, cutting off the current path of the motor 11, as shown in FIG. 7B. to stop the motor.

Further, in order to shift from the loading state to the unloading state, as shown in FIG. _5D , by operating the operating knob 56 in the
5 is displaced to its original position, the movable pieces of switch SW2 and switch SW3 are respectively switched to the b side, and the motor drive circuit is connected to switch SW2, storage battery 74, and switch SW as shown by the solid line in Fig. 7C.
5. Switch SW3 and motor 11 form a closed circuit, so cassette detection switch SW1
It is driven in reverse regardless of the Further, after the unloading starts, as described above, the protrusion 21 of the gear 22 of the gear structure 19 is moved away from the switch SW4 and turned on as shown by the dotted line. Even if the lid section 68 is opened and the cassette B is taken out just before the end of unloading, the motor drive circuit avoids the switch SW1 that detects the cassette, so the loading arms 25, 35 will not reach the final unloading position. will be moved. When the unloading end position is reached, the projection 21 of the gear 22 of the gear structure 19 presses the switch SW5 to turn it off as shown by the dotted line, cutting off the current path of the motor 11 and stopping the motor. That is, at the time of unloading, the motor drive circuit is formed regardless of the switch SW1 that detects the cassette, so even if the lid 68 is opened and the small tape cassette B is taken out from the adapter A just before the end of unloading, , loading arm 25, 35
Since the adapter A always returns to its final position, the adapter A is always maintained in an optimal condition for loading other small cassettes.

Here, the operations and operations when using the adapter A having the above configuration will be comprehensively explained.

(1) As shown in FIG. 8, when the small cassette B is loaded into the storage section C with the lid section 68 of the adapter A open, the cassette detection switch SW1 is closed.

(2) When the lid part 68 is closed, the hook part 67 presses the switches SW2 and SW3 via the displacement member 65, and the movable pieces of each switch are switched to the a side, and loading is started. Upon the start of this loading, the first gear group D is driven, and the loading arms 25 and 35 are rotated in the directions shown by the two-dot chain lines, respectively.

On the other hand, the connecting rod 31 moves in the _X1 direction during loading from the state shown in FIG. 5B, as shown in FIG. 5D. As the connecting rod 31 moves, the locking member 60 moves in the _X1 direction by the self-returning force of the coil spring 63, enters the hook portion 67, and locks the lid portion 68 in a double manner.

As the gear structure 19 rotates, the protrusion 21, which had been pressing the switch SW5 at the position shown by the solid line, moves to the position shown by the dashed-dotted line and presses the switch SW4. OFF
Then, the motor circuit is cut off and loading is completed.

(3) At the end of loading, when adapter A is loaded into a device (not shown), the magnetic tape 40 is further pulled out by a loading pin (not shown) inside the device, forming a predetermined tape path, and attaching to the tape. The signal is recorded or played back.

When the device is placed in stop mode, the tape is unloaded within the device.
The tape 40 is returned to the inside of the adapter A, and the eject operation is subsequently performed to eject the adapter A from the apparatus.

(4) Move the operating knob 56 of the ejected adapter A to the fifth
From the state shown in Figure C, operate the displacement member 65 in the X ₂ direction.
is displaced to the state shown in FIG. 5D. At this time, the movable pieces of switches SW2 and SW3 of the motor drive circuit are respectively switched to the b side as shown in FIG. 7C, and unloading is started. Connecting rod 3
1 moves from the position _P1 in FIG. 5D to the position _P3 in FIG. 5B while entraining the lock arm 60 in the _X2 direction.

Immediately before the end of unloading due to the movement of the lock arm 60, the distal end 61b of the lock arm 60 releases the lock from the hook 67 of the lid 68, allowing the lid 68 to be opened by the coil spring S. When the lid part 68 is closed, the displacement member 65, which has been prevented from returning by the hook part 67, is moved back by the returning force of the coil spring 64 _, etc.
move in the direction. This state is the state shown in FIG. 5A. The motor 11 continues to rotate,
The protrusion 21 of the gear structure 19 is the switch SW5
Press to turn it off, cut off the current path of the motor 11, and complete the unloading.

As a result of the above, the small tape cassette adapter A
A series of loading and unloading operations are performed within the system.

(Effects of the invention) As described above, according to the small cassette tape adapter of the present invention, during tape unloading, the motor drive circuit is connected to the first
The loading arm is formed regardless of the detection means, so even if the lid is opened and the operator takes out the small tape cassette from the adapter just before unloading ends, the loading arm will always return to the final position. Therefore, this adapter has the advantage that it can always maintain an optimal condition for loading other small tape cassettes.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the small tape cassette adapter according to the present invention with the top plate removed, and Fig. 2 shows an example of a small tape cassette housed in the adapter shown in Fig. 1. Figure 3, a perspective view seen from the bottom, shows the structure of the gear train of the drive system of the tape loading mechanism.
4 is a cross-sectional view taken along the line in FIG. 1, showing the structure of the gear train of the reel drive system, and FIG. 5 is a sectional view taken along the line in FIG. The mechanism shows the operating knob and associated related mechanisms when the tape cassette is stored. Figure A shows the storage compartment in the open state, Figure B shows the storage compartment in the closed state, and Figure C shows the loading state. Figure D is a sectional view showing the state at the start of unloading,
Figure 6 is a sectional view of the connecting rod, Figure 7 is a circuit diagram showing the motor drive circuit in the adapter, Figure A shows the loading state, Figure B shows the loading completed state, and Figure C shows the loading state. Figure D shows the initial state where the lid is opened and no cassette is stored, Figure 8 is a perspective view of the adapter storage with the lid open, and Figure 9 shows the unloading start state. is a bottom view of the same, FIG. 10 is an exploded perspective view of the operating knob mechanism, and FIG. 11 shows the state shown in FIG.
The upper half including the storage section from the direction of arrow T in figure A,
It is a side view also showing the lower half and the lid part. A...Adapter for small tape cassette, B...
Small tape cassette, C...storage section, D...first
gear group, E... second gear group, 1... adapter housing, 2... upper half, 3... lower half, 4...
Front cover, 5...through hole, 8...take-up side tape reel,
9... Supply side tape reel, 10... Gear, 11
... Motor, 12 ... Worm, 13 ... Worm wheel, 19 ... Gear structure, 21 ... Protrusion, 25, 35 ... Loading arm, 27 ...
...Special chain, 28...Cam, 29a, 29
b, 37a, 37b... Lock arm, 30, 3
9...Pole, 31, 33...Connecting rod, 31e...
... protrusion, 32 ... bell crank, 34 ... cam section, 40 ... magnetic tape, 41 ... tape path,
43... Unidirectional clutch, 47... Tension arm, 56... Operating knob, 57... Operating unit, 5
8...Lower locking part, 58a...Protrusion, 59...
Arm part, 60... Lock member, 61... Guide part, 6
2...Locking part, 63, 64...Coil spring, 65
... Displacement member, 65a ... Base, 66 ... Leaf spring, 67 ... Hook part, 68 ... Lid part, 71 ... Link, 72 ... Brake release pin, 73 ... Lever, 74 ... Storage battery, 75... Projection piece.

Claims (1)

[Scope of Claim for Utility Model Registration] A storage part C that stores a small tape cassette B smaller than the standard type, and a lid part 68 that covers the top surface of the small tape cassette stored with the lid closed, which operates in one direction. A tape loading operation is performed to form a tape path corresponding to the front tape path of a standard type tape cassette, and the tape forming the tape path is stored in the small tape cassette by operating in the opposite direction. A small tape cassette adapter used in a magnetic recording and reproducing device for a standard type tape cassette, which has a tape loading mechanism that performs a tape unloading operation, and includes a motor 11 that drives the tape loading mechanism; a power supply section 74 that supplies power to the motor; one of a pair of power terminals b, a connected to one electrode side of the power supply section 74; and the other of the pair connected to the other electrode side of the power supply section. power terminal a,
b, and a pair of movable pieces that are switched and connected to one power terminal and the other power terminal and are connected to each power terminal of the motor 11, and when the lid portion is closed, the pair of movable pieces a second detection means comprising a pair of switches SW2 and SW3 which are switchably connected to the one power supply terminal and the other power supply terminal; a second detection means which is connected between the one power supply terminal of the pair of switches SW2 and SW3; a first detection means SW1 for detecting the small tape cassette B stored in the storage section; and a first detection means SW1 connected between the other power terminals of the pair of switches SW2 and SW3, which detects the tape loading end position of the loading mechanism; It consists of third detection means SW4 and SW5 that detect the unloading end position and cut off the power supply to the motor 11, and when the lid part 68 is closed, the first detection means
A drive circuit for the motor 11 in the loading direction is formed by switching the pair of movable pieces of the second detection means and the third detection means, and when the lid portion 68 is opened from the closed state, Second
switching of the pair of movable pieces of the detection means and the third
An adapter for a small tape cassette, characterized in that a drive circuit for the motor 11 in the unloading direction is formed by the detection means.