JPS6112626Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tape cassette, in which the central part of a plate spring that presses the supply reel and take-up reel is mounted at a position offset from the center of the cassette housing, and both An object of the present invention is to provide a tape cassette which can be downsized by reducing the interval between reels.

A small tape cassette according to the present invention that can be housed in an adapter and used in a standard type recording/reproducing machine will be described below.

When attempting to use a small tape cassette used in a recording/playback machine such as a video tape recorder, in a recording/playback machine that is equipped with a larger tape cassette, such as a standard type tape cassette, You will need an adapter to convert this small tape cassette to a standard type tape cassette. This adapter may simply serve as a housing when the tape running path of a small tape cassette is configured in the same way as that of a standard tape cassette. Any concave case body that fits into the rear and both sides of the tape cassette may be used. However, even if a tape cassette is smaller than the standard type, the tape running path is the same as that of the standard type. Can not.

Therefore, in order to make a small tape cassette substantially smaller, the tape running path must be different from that of a standard type tape cassette. This cannot be done without reducing the distance between the two. Therefore, when a small-sized tape cassette constructed as described above is used in a standard type recording/reproducing machine, a concave case body that merely serves as a housing for the tape cassette is insufficient. That is, when a small tape cassette is installed, it must be possible to change the tape path of the small tape cassette using an adapter so that it can be adapted to a standard type recording/reproducing machine.

The present invention has been made in accordance with the above object, and one embodiment of the tape cassette adapter according to the present invention will be described below.

The cassettes shown in FIGS. 1A, 1B, 1C, and 1D are smaller than standard cassettes, which are used when attached to a recording/playback machine such as a standard video tape recorder, and are used when attached to a portable type recording/playback machine, for example.
For example, a plan view of a small cassette with a small amount of tape,
These are a side view, a rear view, and a bottom view, Fig. 2 is a plan view of the small cassette with the upper half removed, Fig. 3 is a schematic sectional view, and Figs. 4 and 5 are parts diagrams and portions of the small cassette. It is an enlarged explanatory diagram.

In the figure, A is the entire small cassette, and the frame of this small cassette A consists of an upper half 1, a lower half 2, and an opening/closing lid 3 for protecting the tape. As shown, it is rotatably attached to the upper part of the front side of the upper half 1 by means of a support shaft 4. As shown in FIG.

A sliding piece 7 is pressed by a substantially U-shaped spring 6 inserted into a groove 5a bored in the side surface of the upper half 1 and is held slidably within the groove 5b.
One end of the opening/closing lid 3 abuts the first abutting portion 3a of the opening/closing lid 3, and the opening/closing lid 3 is in the closed lid position shown in FIG. 1b.

At this time, the lower end of the opening/closing lid 3 is in abutment with the front end of the lower half 2.

From this closed state, the sliding piece 7 slides against the spring 6 by rotating the opening/closing lid counterclockwise in FIG.

When the dead point is exceeded, the second abutting portion 3b abuts one end of the sliding piece 7, and the force of the spring 6 is also applied, and the opening/closing lid 3 further rotates by 90 degrees. By completely abutting the second abutting portion 3b and one end of the sliding piece 7, and by the elastic force of the spring 6, the open/close lid 3 is maintained in the open state.

In this open state, the open/close lid 3 is located at a higher position than the upper end surface of the upper half 1.

The spring 6 can be easily installed and held in the upper half 1 by inserting it into the cut groove 5a from above the cassette, and a protrusion 5c is formed on the outer extension of the cut groove 5a.
By providing the spring 6 once inserted,
withdrawal can be easily prevented.

Furthermore, by making the kerf 5b a kerf that expands in the depth direction and by making the cross section of the sliding piece 7 into a trapezoid corresponding to the kerf, separation can be easily prevented.

A supply reel 8 and a take-up reel 9 are arranged in this small cassette A, and the distance between the supply reel 8 and the take-up reel is set to a standard distance that cannot be installed with this small cassette A alone. The distance between the supply reel disk and the take-up reel disk of this type of recording/reproducing device is shorter than the distance between the supply side reel disk and the take-up side reel disk of this type of recording/reproducing device.

The magnetic tape 10 is arranged so that it runs along a predetermined running route between the supply reel 8 and the take-up reel 9.

That is, the magnetic tape 10 is
Guide poles 11a, 12a, 11b, 12
It comes to be wound up on the winding side reel 9 through step b. An uneven groove 14 is formed on the lower surface of the lower flange 13 of the supply reel 8, and an uneven groove that can engage with the uneven groove is also formed at a predetermined position of the lower roof 2 with respect to the uneven groove 14 of the lower flange 13. Normally, the supply reel 8 is biased toward the lower half 2 by the action of a leaf spring 16 attached to the upper half 1, and the uneven grooves 14 and 1
5 mesh with each other, the supply reel 8 is fixed, and the magnetic tape wound on the supply reel 8 is prevented from loosening.

Figures 4a and 4b show a leaf spring 16 which is the main part of the present invention.
FIG. 2 is a plan view and an explanatory view of the plate spring 16, and the plate spring 16 is fixed to the upper half by fitting the protrusion of the upper half 1 into the hole 16a in the center of the plate spring 16 and welding it.

As shown in FIG.
It has a letter-shaped shape and is mounted at a position offset from the center of the upper half 1 to the back side. That is, when the upper half and the lower half 2 are assembled, the center portion of the leaf spring 16 is located in a substantially triangular space surrounded by the supply reel 8, the take-up reel 9, and the back surface of the upper half 1. It is mounted at a position offset from a line passing through the centers of the supply reel 8 and the take-up reel 9, respectively.

Therefore, even if the position of the supply reel 8 or the take-up reel 9 is displaced when the small cassette A is attached to a recording/reproducing device exclusively for small cassettes, both reels 8 will be attached to the welded part in the center of the leaf spring 16. , 9 are unlikely to touch each other. Furthermore, the distance between the reels 8 and 9 can be reduced, making the small cassette A even more compact.

The leaf spring 16 presses both reels 8 and 9 toward the lower half 2 side by the elastic force of bending the winding side 16b and the supply side 16c toward both reels 8 and 9 from the attached central part. .

Here, the amount of bending of the leaf spring 16 is determined from the winding side 16b.
The bending amount s of the supply side 16c is larger than the bending amount t of the supply side 16c. For this reason, the elastic force against the supply reel 8 is greater than against the take-up reel 9, which helps regulate the position of the supply reel during recording and playback (furthermore, stabilizes the running of the supply tape when used in a portable device). This has effects such as being able to reliably brake the supply reel when not in use.

In addition, when attached to a small cassette recording/playback device,
The supply reel 8 is lifted by a supply reel disk 80 of the recording and reproducing device by a specified amount toward the half 1 side against the repulsive force of the leaf spring 16, and the engagement between the uneven grooves 14 and 15 is released. will be done.

That is, a hole 17 for inserting a supply reel disk 80 of the recording/reproducing device is formed in the lower half 2 at a position corresponding to the supply reel 8 . will be done. The take-up reel 9 is inserted into a shaft 8 fixed to the lower half 2 and is rotatable about the shaft 18 .

The shaft 18 is implanted in the lower half 2 by a screw 19 passing through the center of the recess 2a at the bottom of the lower half 2, as shown in FIGS. 1d and 10.

The lower end surface of the screw 19 does not protrude from the lower end surface of the lower half 2, and protrudes from the surface of the recess 2a.
Therefore, as will be described later, the lower end of the screw 19 can be used as a reference for regulating the position when the small cassette A is inserted into the cassette adapter B.

In the schematic sectional view of FIG. 3, the recess 2a of the lower half 2 is omitted for the sake of simplification, and the details are as shown in FIG. Teeth 23 are formed on the outer periphery, and cutouts 24 are formed at predetermined locations on the lower half 2 so that, for example, gears can be engaged with the teeth 23.

Furthermore, the lower end of the gear teeth 23 on the peripheral edge of the lower flange has a ninth
As shown in the figure, a hole is formed at the lower end of the tooth. As will be described later, the teeth of the driving gear of the cassette adapter B are similarly tapered at the upper end.
It facilitates the interlocking of both teeth.

Then, the take-up reel 9 is rotated by a predetermined driving force transmission mechanism such as a gear that meshes with the teeth 23.
The magnetic tape passes through a predetermined running path from the supply reel and is wound onto the take-up reel.

This take-up reel 9 is provided to prevent the take-up reel 9 from rotating when the small cassette A is not installed in the recording/reproducing device, and to prevent the take-up reel 9 from rotating when the small cassette A needs to be fed out from the mold cassette A. A brake mechanism is provided so that the magnetic tape can be easily and easily fed out without damaging it.

This brake mechanism is shown in FIGS. 2 and 5, for example.
Figure (Figure 5 shows the second half with the upper half attached.
As clearly shown in FIG. When inserted into the shaft 26 and pressed by the action of the spring 27, the brake 25
The shoe portion 25a contacts and presses the upper surface of the peripheral edge of the lower flange 22, so that the take-up reel 9 does not rotate and the magnetic tape does not loosen.

In order to release this braking state and allow the take-up reel 9 to rotate, a pin is inserted through the hole 32 formed in the lower half 2, and the other end 25b of the brake 25 is controlled by this pin. spring 27
By lifting the shoe part 25a of the brake 25 away from the upper surface of the peripheral edge of the lower flange 22 of the take-up reel 9, the take-up reel 9 becomes free and can rotate. become.

With this configuration, both the supply reel and take-up reel are braked when not in use, preventing the magnetic tape from loosening inside the small cassette during transportation, etc., and making it easy to use in recording and reproducing devices. When this happens, both brakes are released.
Furthermore, as will be described later, when using with a cassette adapter, by opening the opening/closing lid of the small cassette and pulling out the magnetic tape, the upper surface of the peripheral edge of the lower flange 22 of the take-up reel and the shoe part of the brake 25 are connected. Since the magnetic tape 25a slides without damaging the magnetic tape or releasing the brake mechanism, the magnetic tape can be easily pulled out from the small cassette with good operability.

Also, the assembly of the take-up side reel mechanism is performed using the lower half 2.
After attaching the take-up reel 9 to the (or immediately after inserting the lower flange in the process of attaching the take-up reel 9), insert the brake 25 into the shaft 26 formed integrally with the lower half, and then insert the brake 25 into the shaft 26 integrally formed with the lower half, axis 2
6 and then attaching the upper half to hold the spring 27 and complete the assembly, making it easy to assemble.

In addition, in the upper half and lower half of the small cassette,
A locking recess and a protrusion are formed at the joint end of the upper half and the lower half, and the upper and lower halves are temporarily fastened by fitting the protrusion and the recess, and then screwed together. Strongly connect the two.

In addition, as shown in Fig. 1b, c, and d, the bottom of the small cassette A has a length from the front and back sides.
Notches 2l ₁ and 2l ₂ are provided _where l ₁ and l 2 are different, and l ₁ >l ₂ .

The lower end of the opening/closing lid 3 is also provided at the same height as the notch _2l1 , and the upper surface of the small cassette has no notch on the front but an arcuate notch _1l3 on the rear. l ₁ > l ₃ .

Therefore, when a small cassette is inserted into a recording/playback device, the protrusion provided on the cassette housing will be inserted into the notch 2 only when the small cassette is inserted correctly.
When the small cassette is inserted into the small cassette ₁₁ and inserted incorrectly, the protrusion on the device side comes into contact with the notches ₂₁₂ and ₁₁₃ of the cassette half, making it impossible to completely install the small cassette.

Figures 6 to 10 show the aforementioned small cassette A.
FIG. 2 is an explanatory diagram of an adapter used when attaching a standard type recording/reproducing device.

In the figure, reference numeral B designates an adapter that can accommodate the small cassette A therein and has a size and shape that allows it to be attached to a standard type recording/reproducing device.

The frame of this adapter B consists of a lower half 51 and an upper half 52, and the lower half 51 has a storage section 53 for storing the small cassette A.
This housing section 53 has protrusions 54, 55 for regulating the position of the small cassette A formed at its ends, and protrusions 54, 55 on the lower half of the small cassette A.
Recesses 28 and 29 are formed corresponding to the positions of the small cassette A, and the screw 19 protruding into the bottom recess 2a of the small cassette A is inserted into the tapered center hole of the annular holder 56 as shown in FIG. 56a, and the protrusion 56b of the annular holder 56 is inserted into the recess 2a.
collide with. These convex portions and concave portions are used to position the small cassette A, particularly in the vertical direction.

Further, pins 58, 59 are implanted in the protrusions 54, 55, and these pins 58, 59 are inserted into the holes 32, 33 formed in the lower half 2 of the small cassette A. Horizontal positioning of small cassette A in adapter B is done using screw 19 of small cassette A.
enters the tapered center hole 56a of the annular holder 56, and the pin 58 of the protrusion 54 enters the elongated hole 32 of the small cassette A. pin 5
Reference numeral 8 serves to release the brake of the take-up reel 9 of the small cassette A. That is, pin 58 and hole 32
As clearly shown in FIG. 5, the position is such that when the pin 58 is inserted into the hole 32, the pin 58 lifts the brake 25, which is the brake mechanism of the take-up reel 9 of the small cassette A. be.

101 and 102 are the upper half 52 of adapter B
A hinge 103 is attached to the upper half 52 so as to be able to open and close the lower half 51. The hinge 103 is attached to the upper half 52 by a spring 105 around a support shaft 104 and constantly biased in the direction of closing the lid. This is the opening/closing lid of cassette adapter B. Reference numeral 106 denotes a lever that is fixed to the support shaft 104 and has inclined cam surfaces 106a and 106b.
By contacting the protrusion 107 fixed to the lower half 51 with the inclined cam surfaces 106b, 106a, etc.,
This operation causes the opening/closing lid 103 to be opened/closed by a small amount.

When the upper half 52 is opened and closed, as shown in FIG. 7 (cross-sectional view taken along the line - in FIG. 6), the claw portion 108 at the end of the side surface, which is integrally formed with the upper half 52, opens and closes the lower half. By being engaged with a notch 108 provided on the side surface of the adapter B, the upper and lower halves of the adapter B are locked in the open/closed state.

This lock can be easily released by pressing the protrusion 110 on the side surface of the upper half 52 inward. Reference numeral 111 indicates a protrusion 110 integrally formed with the upper half 52, and a cut groove bored on the side surface of the upper half 52 to provide elasticity to the claw portion 108. Reference numerals 112 and 113 indicate the upper half 52, This is a guide protrusion provided on the side abutting portion of the lower half 51.

When adapter B with small cassette A inserted therein is attached to a standard type recording and reproducing machine, the supply reel disk of the two reel disks of the recording and reproducing machine is inserted into the supply reel 8 of small cassette A. However, since the take-up reel disk cannot be inserted into the take-up reel 9, the take-up reel disk is inserted into the lower half 51 of the adapter B at a position corresponding to the position of the take-up reel disk. A gear 60 that is driven by the engine is attached.

Further, a gear 61 is attached to the lower half 51 so as to mesh with the gear 60, so that the gear 61 meshes with the teeth 23 of the lower flange 22 of the take-up reel 9 of the small cassette A when the small cassette A is stored in the adapter B. .

The gear 61 is a shaft mounted on the tip of a plate 114 that is rotatably held between the annular holder 56 and the bottom surface of the lower half 51, with the center hole 56a of the annular holder 56 as the center. Further, the shaft 115 passes through a hole in a protrusion 116a of an annular holder 116 into which a take-up side reel disk insertion part 60a integrated with the gear 60 is fitted, and a slide lever 117. is fixed to the tip of the The sliding lever 117 is a lever 1 that is mounted on the lower half 51 and rotates around a support shaft 118.
19 to be slidable over a predetermined range, and the gear 6
1 is held parallel to the bottom surface of the lower half 51.

Because of this configuration, even if the position of the reel disk on the take-up side is changed between the recording and reproducing devices used, the position of the gear 60 will change according to the device. Since the distance between the reel 9 and the take-up reel disk is not changed, the meshing state between the gear 61, the teeth 23 of the lower flange 22, and the gear 60 will not come off.

Further, since the gear 61 is not pressed in the direction of the gear 60 and the teeth 23 by the spring, the magnetic tape can be wound with a relatively weak torque. (As a result, despite the addition of a take-up reel transmission mechanism and the complication of the magnetic tape running path, this application shows that it is possible to record and reproduce data on a small cassette using an adapter using a conventional device that uses a standard cassette. ) As small cassette A was inserted into adapter B, the lower reel flange 22 inside small cassette A
In order to easily and securely mesh the teeth 23 and the gear 61, as clearly shown in FIG. 61b.

For this purpose, the lower reel flange 22,
The gear 61 can be reliably engaged with the teeth 23 of the lower reel flange 22 no matter where the gear 61 is located.

Since the abutment state between the brake 25 and the periphery of the lower flange is released by the pin 58, the driving force of the recording/playback machine is applied to the supply reel 8 of the small cassette A.
This is transmitted to the take-up reel 9, and the magnetic tape begins to run.

In other words, even if you try to install small cassette A into a standard type recording/reproducing machine, the relative positions of the supply reel and take-up reel of small cassette A will be different from the supply reel disk and take-up reel of the recording/reproducing machine. For example, if the supply reel disk is placed on the supply reel, a gear similar to the take-up reel is installed at the position of the take-up reel disk, and this gear and the small cassette take-up By disposing a driving force transmitting means between the side reel and the side reel, the driving force of a standard type recording/reproducing machine can be transmitted to the small cassette A.

Additionally, in general, in VTRs, etc., the rotational unevenness of the supply reel has a worse effect on recording and reproducing performance than the rotational unevenness of the take-up reel, so in this embodiment, the drive system of the supply reel is different from the conventional one. It has the same configuration as the standard device, but the take-up reel drive system has been changed to have less impact.

120 is the support shaft 1 installed on the bottom of adapter B.
20c is an accidental erasure prevention lever that is constantly biased with clockwise rotational force by a coil spring 120d, and one end 120a is connected to the lower half 5.
1 and is locked in the manner shown in FIG. 120b is a detection projection provided on the accidental erasure prevention lever 120, which protrudes into the small cassette storage section, and when the small cassette A is inserted, detects the presence or absence of the accidental erasure prevention claw 2d, and when the claw 2d is present, detects the detection projection. , the erroneous erasure prevention lever 120 is moved to the sixth position by the claw 2d.
It rotates counterclockwise from the state shown in the figure, so that the end portion 120a forms approximately the same surface as the back surface of the lower half 51. When a small cassette A that cannot be recorded is inserted into the adapter B, the accidental erasure prevention lever 120
is in the state shown in FIG.

Notch 1 drilled in the lower half 51 of adapter B
21, 122, 123, 124 and opening 125,
126, 127, 128, etc. are the same as the standard type cassette, and are notches for inserting the loading pole, capstan, and lid opening lever, respectively, and openings for inserting the light source for tape end detection, brake release pin, and positioning pin. It is.

129 is a spring for pressing the gear 60 fixed to the upper half 52 at the base, 130 is a transparent plate welded to the upper half 52, and 131 is a notch into which the opening/closing lid is inserted when the small cassette A is opened. Department.

When using the above-mentioned small cassette A by attaching it to a recording/playback device exclusively for this small cassette, such as a portable type recording/playback device, attach a standard type cassette to the standard type recording/playback device. As in use, the small cassette is inserted into the cassette housing 132 of the pop-up mechanism of the recording/reproducing apparatus as shown in FIGS. 11 and 12.

When the small cassette A is inserted in the normal state shown in FIG. 12, the protrusion 13 on the bottom of the cassette housing
3 is inserted into the bottom notch _2l1 of the small cassette A, and when fully installed, it abuts against the bottom of the cassette and its position is regulated. If the small cassette A is incorrectly inserted, the protrusion 133 will come into contact with the cassette, making it impossible to insert any more cassettes.

When the small cassette A is inserted into the cassette housing 132, the upper surface of the small cassette is rotated counterclockwise around the support shaft 137 in FIG. 11 by the spring 136.
The small cassette A is pressed by the pressing part 138a of No.8.
is pressed against the lower surface of the cassette housing 132.

When the pop-up mechanism is moved to the operating position,
The front lid of the small cassette A is opened, and the notches 3 formed in the front and bottom parts of the small cassette A are opened.
At 6, 37, and 38, the loading pole 134, capstan 135, etc. of the recording and reproducing device are inserted inside the magnetic tape (as shown in Figure 2), and the supply reel disk of the recording and reproducing device is inserted into the supply side of the small cassette. A mechanism for transmitting driving force to the take-up reel, which is fitted to the reel and similar to the gear in adapter B of the recording/reproducing device, is inserted into the small cassette in connection with the movement of the pop-up mechanism from the non-operating position to the operating position. The lower flange teeth of the take-up reel engage with each other, and the driving force of the recording/reproducing device is transmitted to the take-up reel as well. Further, a recess 28 formed in the lower half 2 of the small cassette,
29, the convex portion of the recording/reproducing device matches, and the pins of the recording/reproducing device are inserted into the holes 32, 33 of the lower half, and the position of the small cassette adapter is regulated in the recording/reproducing device, and the small cassette A The lock state of the brake on the take-up reel is released, and the magnetic tape is maintained in a running state.

Then, the magnetic tape is unwound from the small cassette by the loading pole, attached to the rotating magnetic head, and the driving force is transmitted to the take-up reel so that the magnetic tape runs along a predetermined running path, allowing recording and playback to take place. It is done.

When taking out the small cassette A from the dedicated recording/reproducing device, the cassette housing 132 is raised to the non-operating position by the stop operation and the eject operation, and then the small cassette A is moved to the right in FIG. 11 by a spring (not shown). Extruded.

By moving this small cassette A to the right,
The second abutting portion 3b of the opening/closing lid (which protrudes from the upper surface of the cassette when the lid is opened) comes into contact with the pressing portion 138a of the rotating lever 138, and the rotating lever 138 applies a rotational force in the counterclockwise direction. Since rotation is restricted even when the lid is closed, the opening/closing lid 3 is closed against the elastic force of the spring 6, and the small cassette A can be taken out with the lid closed.

When using this small cassette A with a standard type recording/playback device, attach the small cassette A to the adapter B, and then attach this adapter B to the recording/playback device in the same way as when using a standard type cassette. Perform recording and playback.

That is, first, with the front cover of the small cassette A opened, a predetermined amount of the magnetic tape 10 is pulled out.
At this time, the brake 25 is in contact with the take-up reel 9, but the lower reel flange 22 and the brake 25
The slip allows the magnetic tape to be pulled out easily and without damage. By inserting the protrusion of the adapter accommodating part 53 into the side recess of the small cassette A, erroneous insertion can be prevented and the small cassette A can be stored in the adapter B's accommodating part in the normal position.

The pulled-out magnetic tape is attached to the guide poles 64 and 65 provided on adapter B, and the magnetic tape is placed on the front of adapter B in the same way as the magnetic tape path on the front of a standard type cassette. Close the lid so that the half matches the bottom half.

As mentioned above, when the small cassette A is stored in the storage section 53 of the adapter B, the screw 19 on the bottom of the small cassette A is inserted into the center hole 56a of the annular holder 56.
Further, by inserting the pin 59 into the elongated hole 33, the small cassette A is positioned.

Due to the lid closing operation of the upper half 52 of the adapter B,
Opening/closing lid 1 rotatably provided on the upper half 52
03 has protrusions 1 on the inclined cam surfaces 106a and 106b.
07 is installed, the lid is opened once, and then the lid is closed.

Therefore, the upper half 52 of the adapter B can be closed to the lower half 51 without causing inconveniences such as damage or bending of the guide poles 64, 65 and attached magnetic tape 10 due to the opening/closing lid of the adapter B. can. At this time, the claw portion 1 of the upper half 52
08 is locked in the notch 109 of the lower half 51,
In the closed state, it will be locked.

Since the opening/closing lid 3 of the small cassette A is made of a transparent synthetic resin material, the position of the magnetic tape can be easily seen when attaching the magnetic tape pulled out from the small cassette 3 to the guide poles 64 and 65 of the adapter B. can be used to prevent erroneous operation.

Since the small cassette A stored in the adapter B is constructed in the same way as a standard type cassette, it can be recorded and reproduced by being attached to a standard type recording/reproducing machine.

That is, when the small cassette and the adapter are attached, the gear 61 of the adapter meshes securely with the teeth of the lower flange 22 of the take-up reel 9 as shown in FIG.
lifts the brake 25 against the repulsive force of the spring, releases the lock state of the take-up reel 9,
The driving force of the take-up reel disk is transmitted to the take-up reel 9 via gears 60 and 61. Conversely, when the small cassette is removed from the adapter, the take-up reel 9 and the gear 61 are disengaged, and
Since the pin 58 is removed from the small cassette, the boogie 25 is restored to its original state by the repulsive force of the spring 27.
The take-up reel 9 is in a locked state.

Incidentally, in order to attach the magnetic tape in the small cassette to the guide pole of the adapter, it is of course possible to attach the magnetic tape in the locked state or in the unlocked state using an appropriate pull-out mechanism.

In addition, the gear 61 is configured so that there is a little degree of freedom in the installation setting, so that the gear 61 can be moved when, for example, a small cassette is attached to or taken out from the adapter.
During installation, the gear 61 may be configured to mesh with the gear 60 and the teeth of the lower flange of the take-up reel. In this case, it is convenient to attach and take out the small cassette to and from the adapter. Become something.

As mentioned above, for example, by constructing an adapter for a small tape cassette, such an adapter allows the small tape cassette to be attached to a predetermined type of recording/reproducing machine.
Furthermore, a small tape cassette can be made smaller because, for example, the distance between the supply reel and the take-up reel can be reduced.

Then, the tape can be pulled out from the tape cassette made small in this way to serve as a tape path in a standard type recording/reproducing machine, and furthermore, the tape can be drawn out from the tape cassette made small enough to be used as a tape path in a standard type recording/reproducing machine. Even if the interval between the reel disks on the recording and reproducing machine is different from the interval between the reel disk on the supply side and the reel disk on the take-up side, there is no need for the reel disk on the winding side to be moved and set. The driving force can be transmitted well to the reel of the tape cassette, and the magnetic tape can be run smoothly.

In addition, for example, since the reel disk on the take-up side does not have to be configured to be movable, the mechanism of the reel disk part is extremely simple, the reel disk is less likely to break down, and the reel drive mechanism is highly durable. becomes.

As mentioned above, the tape cassette according to the present invention is
One of the supply reel and take-up reel is provided facing the reel disk insertion hole formed in the lower plate of the cassette case, and the other reel is installed in the lower plate of the cassette case. A pair of pressing parts are provided so as to be supported on a shaft provided therein, and a pair of pressing parts for pressing each reel in the direction of the lower plate extend from side to side and have a roughly V-shape, so that one of the reels is supported by the other. A plate spring that applies a larger pressing force than the reel is attached to the cassette casing with its central part offset from a line passing through the center of each reel. Regarding the mounting method, the space for the mounting position is widened, and there is no risk that each reel will come into contact with the spring mounting protrusion due to displacement of the position of both reels, and the degree of freedom in the mounting position is increased, making manufacturing easier. In addition, the V-shaped shape allows for efficient board removal, and the distance between each reel can be shortened to make it more compact. Since one reel is given a greater pressing force than the other reel, it has features such as being able to reliably regulate the position of said one reel during recording and playback and brake when not in use. It is.

[Brief explanation of the drawing]

1a, b, c, d to 5 are explanatory views of a tape cassette according to the present invention, and FIGS. 6 to 10 are explanatory views of an embodiment of an adapter in which this tape cassette is accommodated. FIGS. 11 and 12 are diagrams for explaining the installation of a small cassette into a dedicated recording/reproducing machine. A... Entire small cassette, B, C... Cassette adapter, 1, 52... Upper half, 1l ₃ ... Arc-shaped notch, 2, 51... Lower half, 2a, 28,
29...Concavity, 2d...Erroneous erasure prevention claw, 2l ₁ , 2
l ₂ ...notch, 3...opening/closing lid, 3a...first abutment, 3b...second abutment, 4,104,118,
120c, 137, 142, 145, 152, 1
54, 157, 164... Support shaft, 5a, 5b, 1
11...kerf, 5c, 56b, 110, 116a
...Protrusion, 6... U-shaped spring, 7...
Sliding piece, 8... Supply side reel, 9... Winding side reel, 10... Magnetic tape, 1a, 11b, 12
a, 12b, 64, 65...Guide pole, 13
... lower flange, 14, 15 ... uneven groove, 16 ...
...Plate spring, 17...Hole for inserting the supply side reel disk, 18...Shaft fixed to the lower half, 19...
...Screw, 22...Lower flange, 23...Teeth, 2
4, 36, 37, 38, 109...notch, 25
...Brake, 25a...Shoe part, 25b...
The other end of the brake, 26...A shaft integrally formed with the lower half, 27...Spring, 32, 33...
... Hole formed in the lower half, 53 ... Storage section, 5
4, 55...Position regulating protrusion, 56...Annular holding body, 56a...Tapered center hole, 58, 59...
...pin, 60,61,159,163...gear,
60a... Winding side reel disk insertion part, 61
a, 61b... Taper, 80... Supply side reel disk, 101, 102... Hinge, 103...
...Opening/closing lid of cassette adapter B, 105...Spring, 106, 119, 146, 158, 16
0... Lever, 106a, 106b... Inclined cam surface, 107... Protrusion, 108... Claw portion, 112,
113... Guide projection, 115... Shaft, 116...
...Annular holder, 117...Sliding lever, 120
... Erroneous erasure prevention lever, 120a ... One end, 1
20b...detection projection, 120d...coil spring, 121, 122, 123, 124...notch, 125, 126, 127, 128...opening,
129...Press spring, 130...Transparent plate, 131...Notch opening, 132...Cassette housing, 133...Protrusion on bottom of cassette housing, 134...Loading pole, 1
35...capstan, 136...spring,
138... Rotating lever, 138a... Pressing part.

Claims (1)

[Scope of utility model registration request] One of the supply reel and take-up reel is provided facing the reel disk insertion hole formed in the lower plate of the cassette case, and the other reel is installed in the lower plate of the cassette case. A pair of pressing portions are provided to be supported on a shaft provided therein, and a pair of pressing portions for pressing each reel in the direction of the lower plate extend from side to side and have a roughly V-shape. A tape cassette having a structure in which a plate spring that applies a larger pressing force than the reel is attached to the cassette casing with its central portion offset from a line passing through the center of each reel.