JPS6037737Y2 - tape cassette - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tape cassette, which has a supply reel and a take-up reel, and the inter-reel dimension between the supply reel and take-up reel is similar to that of a standard type recording/reproducing machine. The dimension is set to be shorter than the inter-reel dimension between the supply reel and the take-up reel stored in the tape cassette used, and the supply reel is stored loosely in the case of the tape cassette, and the take-up side The reel is a small tape cassette housed rotatably supported on a shaft provided in a tape cassette case, and a reel disk insertion portion is formed on the supply side reel of the small tape cassette. The case of the small tape cassette is formed with a reel disk insertion hole corresponding to the reel disk insertion portion, and a notch for connecting an external drive means corresponding to the flange of the take-up reel, Furthermore, by configuring the tape winding shaft diameter of the take-up reel to be smaller than the tape winding shaft diameter of the supply reel, even if the tape cassette is downsized, a relatively long tape can be loaded into the tape cassette. Therefore, even with a small tape cassette, long-time recording and playback can be performed.Furthermore, the tape feed speed is almost uniform, the tape runs smoothly, and the tape cassette has excellent recording and playback performance. The purpose is to provide.

1a, b, and Ct d are smaller cassettes than standard type cassettes used when attached to a recording/reproducing apparatus such as a standard type video tape recorder, for example, tapes used when attached to a portable type recording/reproducing apparatus. These are a plan view, a side view, a rear view, and a bottom view of a small-sized cassette with a small amount. Fig. 2 is a plan view of the small-sized cassette with the upper half removed, Fig. 3 is a cross-sectional view, and Figs. 4 and 5. and FIG. 6 are partially enlarged explanatory views of the small cassette.

In the figure, A is a small cassette, and this small cassette A
The frame body consists of an upper half 1, a lower half 2, and a front cover 3 for protecting the tape, and the front cover 3 has a hinge portion 4 formed by molding a part thinly of resin such as polypropylene. The front cover 3 is normally biased in the closing direction by the action of the leaf spring 5 and attached to the upper half 1.

A hole 6 is formed in the lower half 2, and a projection 7 is formed in the front lid 3.
is formed, and when the front cover 3 is closed, the protrusion 7 is engaged with the hole 6, and the front cover 3 is locked.

By pressing the protrusion 7 and moving it backward, the locked state between the protrusion 7 and the hole 6 is released, and the leaf spring 5 can rotate the front cover 3 against the repulsive force to open it. It has become.

Inside this small cassette A, there is a supply reel 8 with a large diameter a1 and a2 of the shaft and flange on which the magnetic tape is wound, and a supply reel 8 with a large diameter a1 and a2 of the shaft and flange on which the magnetic tape is wound. A take-up reel 9 with a small diameter is provided, and the distance between the supply reel 8 and the take-up reel 9 is equal to that of a standard type recording/reproducing device that cannot be installed only with this small cassette A. The distance is shorter than the distance between the supply side and take-up side reel disks.

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

That is, the magnetic tape 10 passes from the supply reel 8 through the guide poles 11 and 12 and is wound onto the take-up reel 9.

An uneven groove 14 is formed on the lower surface of the lower flange 13 of the supply reel 8.
is formed, and the uneven groove 1 of this lower flange 13 is formed.
An uneven groove 15 that can engage with the uneven groove 14 is also formed at a predetermined position of the lower half 2 corresponding to the upper half 1, and normally the supply side reel 8 is It is biased toward the lower half 2 side, and the concave and convex grooves 15 engage with each other, so that the supply reel 8 is fixed and the magnetic tape wound on the supply reel 8 is prevented from loosening.

A hole 8' is formed in the center of the lower end of the supply reel 8, and when the small cassette is installed in the recording and reproducing apparatus, the supply reel 8 is inserted into the supply reel disk 8 of the recording and reproducing apparatus.
0, the half 1 side is lifted by a specified amount against the repulsive force of the leaf spring 16, and the engagement between the uneven grooves 14 and 15 is released.

That is, a hole 17 for inserting the supply reel disk 80 of the recording/reproducing device is formed in the lower hole 2 at a position corresponding to the hole 8' of the supply reel 8. is inserted into the hole 8' of the supply reel 8.

The take-up reel 9 is inserted into a shaft 18 fixed to the lower half 2 and is rotatable about this shaft 18.

The shaft 18 can be attached to the lower half 2, for example.
A groove 19 is formed in the lower part of the lower half 2, and a protrusion 20 that fits into the groove 19 is formed on the lower half 2, and with the protrusion 20 fitted in the groove 19, the screw 21 is If the shaft 18 is screwed onto the lower nozzle 2 by means of screwing, etc., the shaft 18 will not rotate idly during screwing, so it can be easily attached.

Teeth 23 are formed on the outer periphery of the lower flange 22 of the take-up reel 9, and cutouts are provided at predetermined locations on the lower half 2 so that gears (external drive means) can be engaged with the teeth 23, for example. 24 is formed.

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, and the magnetic tape is wound from the supply reel through a predetermined traveling path to the take-up reel. Become.

This take-up reel 9 is provided with a brake mechanism so that the take-up reel 9 does not rotate when the small cassette A is not installed in the recording/reproducing apparatus.

This brake mechanism includes, for example, a pawl 25 that engages with teeth 23 of the lower flange 22 of the take-up reel 9.
is inserted into the shaft 26 of the lower half 2, and when it is pressed and biased by the action of the spring 27,
The pawl 25 hooks onto the teeth 23 of the lower flange 22, and the winding side -
The magnetic tape 9 does not rotate and the magnetic tape does not loosen.

In order to release this latched state and allow the take-up reel 9 to rotate, a pin is inserted through the hole formed in the lower half 2, and the pin is used to push the claw 25 onto the spring 27.
The claw 25 and the lower flange 22 of the take-up reel 9 are raised at different levels, and the take-up reel 9 becomes free and able to rotate.

Note that the upper and lower halves of the small cassette are provided with a recess and a protrusion for latching at the joining end of the upper and lower halves. Temporarily fasten the halves and firmly connect the two with screws.

FIGS. 7, 8, 9, and 10 are explanatory diagrams of an adapter used when the above-mentioned small cassette A is attached to a standard type recording/reproducing apparatus.

In the figure, B is an adapter that can accommodate the small cassette A inside and has a size and shape that can 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.
The lower half 51 has a storage section 53, which is a notch for storing the small cassette A.

This housing section 53 has protrusions 54, 55, 56, 57 formed at its ends to support the small cassette A, and the lower half 2 of the small cassette A has these protrusions 54, 55, 56.
, 57 are formed, and these protrusions and recesses are used to position the small cassette A, particularly in the vertical direction.

When these protrusions and recesses are fitted, the bottom surface of the small cassette and the bottom surface of the adapter are made to be substantially on the same plane.

In addition, pins 58 and 59 are implanted in the protrusions 54 and 55, and these pins 58 and 59 are connected to the lower half 2 of the small cassette A.
are inserted into the holes 32 and 33 formed in the pin 5, which further positions the small cassette A.
8 also serves to release the brake of the take-up reel 9 of the small cassette A.

That is, the position of the pin 58 and the hole 32 is such that the pin 58 is in the hole 3
2, the take-up reel 9 of the small cassette A
This position is such that the pin 58 lifts the pawl 25, which is the brake mechanism of the motor.

When adapter B with small cassette A inserted is attached to a standard type recording/playback machine, the supply side reel disk of the two reel disks of the recording/playback machine is small cassette A.
However, the take-up reel disk cannot be inserted into the take-up side IJ-reel 9.
A gear 60 to which the take-up reel disk is inserted and driven is attached to the lower half 51 of the adapter B at a position corresponding to the position of the take-up reel disk.

Also, when storing small cassette A in adapter B,
A gear 61 that meshes with the teeth 23 of the lower flange 22 of the take-up reel 9 of the small cassette A is attached to the lower half 51 so as to mesh with the gear 60, and the state of engagement between the claw and the tooth is with a pin. 58, the driving force of the recording/reproducing machine is transmitted to the supply reel 8 and take-up reel 9 of the small cassette A, and the magnetic tape begins to run.

That is, even if you try to install small cassette A into a standard type recording/playback machine, the relative positions of the supply side reel and take-up side reel of small cassette A will be the same as the supply side reel disk and the take-up side reel disk of the recording/playback 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 winding of the small cassette are connected to each other. The driving force of a standard type recording/reproducing machine can be transmitted to the small cassette A by disposing a driving force transmitting means between the reel and the take-side reel.

Also, notches 34 are provided on both shoulders of the upper half 1 of the small cassette A.
．． 35 is formed, and the upper half 5 of the other adapter B
2 has walls 62 and 63 corresponding to the positions of the notches 34 and 35.
is formed, and when the lower half 51 and the upper half 52 are aligned and, for example, screwed together, the small cassette A will not come out from the adapter B, and furthermore, the top surface of the small cassette and the top surface of the adapter will be almost flush. They are designed to be on the same plane.

When using the above-mentioned small cassette A by attaching it to a recording/playback device exclusively for small cassettes, such as a portable type recording/playback device, attach a standard type cassette to the standard type recording/playback device. As in the case of use, when the small cassette is inserted into the pop-up mechanism of the recording/playback device and the pop-up mechanism is moved to the operating position, the front lid of the small cassette A opens, and the front cover of the small cassette A is opened. Notches 36, 37,
At 38, the loading pole, capstan, etc. of the recording and reproducing device are inserted inside the magnetic tape, and the supply reel disk of the recording and reproducing device is fitted to the supply reel of the small cassette. The teeth of the lower flange of the take-up reel mesh with the mechanism for transmitting the driving force to the take-up reel, and the driving force of the recording/reproducing device is transmitted to the take-up reel as well.

Furthermore, a recess 2 formed in the lower half 2 of the small cassette
8, 29, 30, and 31 match the convex portions of the recording/reproducing device,
In addition, the pins of the recording and reproducing device are inserted into the holes 32 and 33 of the lower half, and the position of the small cassette A is regulated within the recording and reproducing device, and the lock state of the take-up reel of the small cassette A by the claw is released. , the magnetic tape is maintained in a runnable state.

Then, the magnetic tape is unwound from the small cassette by the loading pole, is brought into tension with the magnetic head, and the driving force is transmitted to the take-up reel so that the magnetic tape travels along a predetermined running path to perform recording and reproduction.

In addition, 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, store the small cassette A in the storage section of the adapter B with the front lid of the small cassette A opened, and
In this stored state, a predetermined amount of the magnetic tape wound on the supply reel is pulled out from the opened front lid of the small cassette A, and this magnetic tape is attached to the guide poles 64, 65, 66 provided on the adapter B. Arrange the magnetic tape in the same way as the magnetic tape in the standard type cassette, align the upper half of adapter B with the lower half, and screw them together.

Since the small cassette A stored in the adapter B is the same as a standard type cassette, it can be used for recording and reproducing by attaching it to a standard type recording and reproducing machine.

That is, when the small cassette is attached to the adapter, the gear 61 of the adapter meshes with the teeth of the lower flange 22 of the take-up reel 9, and the pin 58 of the adapter lifts the pawl 25 against the repulsive force of the spring. The lock state of the take-up reel 9 is released, and the driving force of the take-up reel disk is transmitted to the take-up reel 9 via the gears 60 and 61.

Conversely, when the small cassette is taken out from the adapter, the engagement between the take-up reel 9 and the gear 61 is disengaged and the small cassette is pulled out of the pin 58, so the claw 25 is restored by the repulsive force of the spring 27 and the winding is completed. The taking reel 9 is in a locked state.

To attach the magnetic tape in the small cassette to the guide pole of the adapter, for example, press the take-up reel directly with your hand to release the locked state of the supply reel, and then press the magnetic tape before opening the lid. Pull out the lid a little by hand, attach the small cassette to the lower half of the adapter, and attach the pulled-out magnetic tape to the guide pole of the adapter directly by hand, or attach the unlocked magnetic tape to a suitable location. It can be attached using a suitable pull-out mechanism.

Furthermore, if the gear 61 is configured to have a small degree of freedom in position setting, the gear 61 may be moved when, for example, a small cassette is attached to or removed from the adapter, and the gear 61 may be moved to the gear 60 during attachment. By allowing the cassette to mesh with the teeth of the lower flange of the take-up reel, it becomes convenient to attach and take out the angle-shaped cassette from the adapter.

As mentioned above, the tape cassette according to the present invention has a supply reel and a take-up reel, and the inter-reel dimension between the supply reel and the take-up reel is the same as that of a tape used in a standard type recording/reproducing machine. The dimension is set to be shorter than the inter-reel dimension between the supply reel and take-up reel stored in the cassette, and the supply reel is stored loosely in the case of the tape cassette, and the take-up reel is A small tape cassette is rotatably supported and housed on a shaft provided in a cassette case, and a reel disk insertion portion is formed on the supply side reel of the small tape cassette. The case of the tape cassette has a reel disk insertion hole corresponding to the reel disk insertion portion,
A notch for connecting an external drive means is formed corresponding to the flange of the take-up reel, and the diameter of the tape winding shaft of the take-up reel is smaller than the diameter of the tape winding shaft of the supply reel. Therefore, even if the tape cassette is made smaller, it is possible to load relatively longer tape than when the supply reel and take-up reel have the same diameter, and therefore even a small tape cassette can be loaded for a long time. Moreover, since the tape winding shaft diameter of the supply reel is made large, even if the reel disk that drives the supply reel rotates at a nearly constant angular velocity, the tape winding can be performed on the supply reel. There is not much difference in the feeding speed of the tape being spun between the beginning and the end of the tape feeding, and therefore the tape feeding speed is almost constant, so the tape runs smoothly. cannot be obtained simply by configuring the tape winding shaft diameter of the take-up reel to be smaller than the tape winding shaft diameter of the supply reel.
This can only be achieved by configuring the reel-to-reel dimensions between the take-up reel and the supply reel, the configurations of the take-up reel and the supply reel, etc. as described above, resulting in excellent recording and reproduction. It has the following features.

[Brief explanation of the drawing]

1 at b, C, d and FIGS. 2 to 6 are explanatory diagrams of embodiments of the tape cassette according to the present invention, and FIGS. 7 to 1
FIG. 0 is an explanatory diagram of an adapter that accommodates a tape cassette. A: Small cassette, B: Adapter, 1: Upper half, 2: Lower half,
8... Supply side reel, 9... Take-up side reel, 1o... Magnetic tape.

Claims (1)

[Scope of utility model registration request] The supply reel and the take-up reel are housed in a tape cassette used in a recording/reproducing machine, and have a supply reel and a take-up reel, and the inter-reel dimension between the supply reel and the take-up reel is a standard type. The reel dimension is set to be shorter than the distance between the side reels, and the supply side reel is housed in the tape cassette case with a loose fit, and the take-up side reel is rotatable around a shaft provided in the tape cassette case. A small-sized tape cassette is stored in a supported manner, and a reel disk insertion portion is formed on the supply side reel of the small-sized tape cassette, and a reel disk insertion portion is formed in the case of the small-sized tape cassette. Correspondingly, a hole for inserting a reel disk and a notch for connecting an external drive means are formed corresponding to the flange of the take-up reel, and the diameter of the tape winding shaft of the take-up reel is the same as that of the supply reel. A tape cassette characterized in that the diameter is smaller than the diameter of a tape winding shaft.