JPS6048821B2 - Tape cassette reel mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reel mechanism of a tape cassette, and the reel mechanism is shorter than the inter-reel dimension between the supply reel and take-up reel built in the tape cassette used in standard type recording/reproducing machines. Rotatably supported on the supply side reel and shaft set to the reel-to-reel dimensions.

The supply reel of the small tape cassette has a reel disk insertion portion formed therein, and the take-up reel has teeth on its flange. Moreover, the case of the small tape cassette is formed with a hole for inserting a reel disk corresponding to the reel disk insertion part, a notch corresponding to the teeth, and a hole on the winding side. A reel flange in which the driving gear for the reel is spaced apart from the teeth of the reel flange when it meshes with the teeth, and engages with the teeth when the driving gear is not meshed with the teeth of the reel flange. By providing the rotation prevention part 1 material, even if the mutual positions of the reel disk of a video tape recorder that drives the magnetic tape reel, for example, and the reel around which the magnetic tape is wound do not match, To provide a reel mechanism for a tape cassette that can transmit the driving force of a reel disk to the reel and has an extremely simple transmission mechanism. For example, a standard type tape cassette is installed in a recording and reproducing machine such as a standard type video tape recorder for recording and reproducing.

In order to record and playback by installing a tape cassette smaller than the standard type tape cassette into such a standard type video tape recorder, the position of the supply side reel and take-up side reel of the small tape cassette must be set to the standard type. There is no problem if the position corresponds to the position of the supply reel disk and the take-up reel disk of a video tape recorder, but in such a tape cassette, the distance between the supply reel and the take-up reel is not small. , it is not that much smaller than a standard type tape cassette. Therefore, by making the interval between the supply reel and the take-up reel smaller than that of a standard type tape cassette, this tape cassette can be made even more compact. It cannot be attached to a video tape recorder for recording and playback. Therefore, in such a case, depending on the distance between the supply reel and take-up reel of the small tape cassette,
The video tape recorder must be constructed so that the supply side reel disk or the take-up side reel disk can be moved and set. However, in order to make the reel disk movable, the mechanism becomes extremely complicated, and it is not desirable to employ it in a recording/reproducing machine such as a video tape recorder. The present invention eliminates the above drawbacks, and one embodiment of the tape cassette reel mechanism according to the present invention will be described below.

1A, b, c, and d are standard type cassettes that are used when attached to a recording/reproducing device such as a standard type video tape recorder. A plan view, a side view, a back view, and a bottom view of a small cassette with a small amount of tape are shown. Fig. 2 is a plan view with the upper half of this small cassette removed, Fig. 3 is a sectional view, Fig. 4, and 5 and 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 constitutes a hinge part 4 which is partially molded thinly from 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 front cover 3 can be opened by rotating against the repulsive force of the leaf spring 5. It's getting old. 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 take-up reel 9 is such that it cannot be installed with only this small cassette A. The distance is shorter than the distance between the supply side and take-up side reel disks of a standard type recording/reproducing device.

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 is
The material passes from the supply reel 8 through the guide balls 11 and 12 and is wound onto the take-up reel 9. Supply side reel 8
An uneven groove 14 is formed on the lower surface of the lower flange 13, and 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 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 15
are engaged with each other, the supply reel 8 is fixed, and the magnetic tape wound on the supply reel 8 is prevented from loosening. When the small cassette is installed in the recording and reproducing apparatus, the supply reel 8 is lifted by the supply reel disk 80 of the recording and reproducing apparatus by a specified amount toward the half 1 side against the repulsive force of the leaf spring 16. The engaged state 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 half 2 at a position corresponding to the supply reel 8.
This supply side reel disk 80 comes to be inserted into the supply side reel 8. The take-up reel 9 is inserted into a shaft 18 fixed to the lower half 2 and is rotatable about the shaft 18. The attachment of this shaft 18 to the lower half 2 can be done, for example, by creating a concave groove in the lower part of the shaft 18.
9 is formed and a convex portion 2 is fitted into this concave groove 19.
0 is formed on the lower half 2, and the shaft 18 is screwed onto the lower half 2 with the screw 21 or the like with the convex portion 20 fitted into the groove 19, the shaft 18 will not rotate freely during screwing. It is easy to install because it does not. Take-up reel 9
Teeth 23 are formed on the outer periphery of the lower flange 22, and cutouts 24 are formed at predetermined locations on the lower half 2 so that gears, for example, can be engaged with the teeth 23.
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 travel path to the take-up reel. It becomes like this. 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 frame structure is composed of, for example, a pawl 25 that engages with the 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 claws 25 are engaged with the teeth 23 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 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 pawl 25 against the repulsive force of 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 can rotate. Note that the upper and lower halves of the small cassette are formed with a recessed part and a convex part for latching at the joining end of the upper half and the lower half, and by fitting the convex part and the recessed part, the upper half and the lower half are temporarily fastened together, and the two are strongly connected 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, and the lower half 51 is formed with a storage section 53, which is a notch in which the small cassette A is stored.

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. Further, pins 58 are attached to the protrusions 54 and 55.
, 59 are implanted, and these pins 58, 59 are inserted into the holes 32, 33 formed in the lower half 2 of the small cassette A, and these pins 58, 59 are inserted into the holes 32, 33 formed in the lower half 2 of the small cassette A. It also serves to release the brake on the take-up reel 9 of the small cassette A. That is, pin 5
8 and the hole 32 are such that when the pin 58 is inserted into the hole 32, the pin 58 lifts the pawl 25, which is the brake mechanism of the take-up reel 9 of the small cassette A.
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, since the take-up reel disk cannot be inserted into the take-up reel 9, the lower half of the adapter B is inserted in the position corresponding to the position of the take-up reel disk. Attached to 51 is a gear 60 into which a take-up reel disk is inserted and driven.

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 determined by the pin 58. Since the magnetic tape is now released, 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 co-supply side reel disk is placed on the supply side reel, a gear similar to that of the take-up reel is installed at the position of the take-up side reel disk, and this gear and the small cassette By disposing a driving force transmitting means between the take-up reel and the take-up reel, the driving force of the standard type recording/reproducing frame can be transmitted to the small cassette A. Further, notches 34 and 35 are formed on both shoulders of the upper half 1 of the small cassette A, and walls 62 and 63 are formed in the upper half 52 of the adapter B in correspondence with the positions of the notches 34 and 35. By aligning the lower half 51 with the upper half 52 and tightening the screws, for example, the small cassette A will not come out from the adapter B, and furthermore, the small cassette I
The top surface and the top surface of the adapter are almost on the same plane.

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. When the small cassette is inserted into the pop-up mechanism of the recording/reproducing device and the pop-up mechanism is moved to the operating position, the front lid of the small cassette A opens and the front and bottom portions of the small cassette A open. Notches 36, 3 formed
At 7 and 38, the loading ball, capstan, etc. of the recording and reproducing device are inserted inside the magnetic tape, the supply reel disk of the recording and reproducing device is fitted to the supply reel of the small cassette, and the adapter B of the recording and reproducing device is inserted. The teeth of the lower flange of the take-up reel mesh with a drive force transmission mechanism to the take-up reel, such as a gear, so that the driving force of the recording/reproducing device is also transmitted to the take-up reel.

Furthermore, a recess 2 formed in the lower half 2 of the small cassette
8, 39, 30, 31 are aligned with 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 fed out from the small cassette by the loading ball, is put in tension with the magnetic head, and the driving force is transmitted to the take-up reel so that the magnetic tape runs along a predetermined running path for recording and reproducing. will be carried out. 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 the magnetic tape is transferred to the guide balls 64, 65 provided on the adapter B. 66, arrange the magnetic tape in the same way as the magnetic tape in a 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 configured 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. In other words, when a small cassette is attached to the adapter, gear 6 of the adapter
1 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, releasing the locked state of the take-up reel 9 and unwinding. 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 the pin 58 is removed from the small cassette, so the claw 25 is restored by the repulsive force of the spring 27. , the take-up reel 9 is in a locked state.
In addition, in order to attach the magnetic tape in the small cassette to the guide ball of the adapter, for example, press the supply reel directly with your hand to release the locked state of the supply reel, and then open the front cover of the magnetic tape. Attach the small cassette to the lower half of the adapter by hand, and attach the pulled-out magnetic tape directly to the guide ball of the adapter by hand, or attach the unlocked magnetic tape to a suitable It can be attached using a 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. If the teeth of the lower flange of the take-up reel are provided with a tooth stand, it will be convenient to use the device for and take out the small cassette adapter. By configuring the reel structure of the tape cassette as described above, even when the reel of the tape cassette and the reel disk of the recording/reproducing machine do not correspond in position, for example, there is no space between the reel and the reel disk of the tape cassette. For example, a gear is provided that meshes with the reel and reel disk, and the driving force of the reel disk is transmitted to the reel via this gear, so even if the positions of the reel and reel disk do not correspond, the reel disk can be moved to the reel position. There is no need for a moving mechanism that matches the reel, which simplifies the reel drive frame structure and makes the reel drive mechanism less likely to break down. The gear formed on the peripheral side of the flange of the reel is a part of the reel drive mechanism, and a stopper that prevents the reel from rotating by inserting, for example, a claw into the recess of the gear. It also becomes part of the structure, and one part plays two roles. If the tape cassette is provided with a notch for inserting a gear at a predetermined position, which meshes with the reel gear and also meshes with the reel disk, there is no need to arrange the gear directly on the tape cassette. , the tape cassette can be made smaller accordingly. Also, when downsizing the tape cassette,
Even if the distance between the supply reel and take-up reel disposed in this small tape cassette is smaller than, for example, the distance between the supply reel disk and take-up reel disk of a recording/reproducing machine, the reel disk can still be driven. Since the force can be transmitted to the reel, a small tape cassette can be made smaller in size by reducing the reel spacing. Then, the miniaturized tape cassette can be mounted on a recording/playback frame that is larger than the small-sized tape cassette, for example, compatible with a standard type tape cassette, and recording and playback can be performed. As described above, the reel mechanism of the tape cassette according to the present invention has a reel-to-reel dimension that is shorter than the reel-to-reel dimension between the supply reel and the take-up reel built in the tape cassette used in a standard type recording/reproducing machine. A small tape cassette is equipped with a built-in supply reel and a take-up reel rotatably supported on a shaft. formed,
In addition, the take-up reel has teeth formed on its flange, and the case of the small tape cassette has a reel disk insertion hole corresponding to the reel disk insertion portion, and a hole corresponding to the teeth. When the drive gear for the take-up reel meshes with the teeth of the reel flange, the drive gear separates from the teeth, and when the drive gear does not mesh with the teeth of the reel flange, the drive gear separates from the teeth of the reel flange. is provided with a reel flange rotation prevention member that engages with these teeth, so the supply side reel and take-up side reel can be driven accurately and reliably, and the position of the reel can be adjusted, for example, to the position of the reel disk. Even if it is different from the above, the driving force is transmitted to the gear part of the reel flange through the gear, and the reel can be rotated.For example, the reel disk can be moved and connected directly to the reel to rotate the reel. This makes the reel drive mechanism simpler and less likely to break down, and the gear part of the reel flange is not only a part of the reel drive mechanism, but also a part of the reel rotation stopper mechanism. It also has the advantage of simplifying the reel mechanism.

[Brief explanation of the drawing]

Figures 1a to 6 are explanatory diagrams of a small cassette for explaining the reel mechanism of the tape cassette according to the present invention, and Figures 7 to
FIG. 10 is an explanatory diagram of an adapter that accommodates this small cassette. A: Small cassette, B: Adapter, 9: Take-up reel, 22: Lower flange, 23: Teeth, 24... Notch, 25... Claw, 27... Spring, 32... Hole, 58... Pin, 60,
61...Gear.

Claims (1)

[Claims] 1. A tape cassette used in a standard type recording/playback machine is equipped with a tape cassette that is rotatable around the supply reel and the shaft, which are set to have a reel-to-reel dimension that is shorter than the reel-to-reel dimension between the supply reel and the take-up reel. A small tape cassette having a built-in shaft-supported take-up reel, wherein the supply reel of the small tape cassette has a reel disk insertion portion formed therein, and the take-up reel has a flange portion formed therein. The case of the small tape cassette has teeth formed thereon, and a hole for inserting a reel disk corresponding to the reel disk insertion portion, and a notch portion corresponding to the teeth. When the drive gear for the side reel meshes with the teeth on the reel flange, it separates from the teeth,
A reel mechanism for a tape cassette, characterized in that a reel flange rotation prevention member is provided that engages with the teeth of the reel flange when the drive gear is not engaged with the teeth of the reel flange.