JP3031809B2 - Endless tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endless tape cassette which accommodates a tape such as a magnetic tape or a cleaning tape such as an audio, and accommodates an automatic stop or auto reverse mechanism.

[0002]

2. Description of the Related Art In a conventional endless tape cassette,
The tape is wound around the rotating hub in a multilayer shape and is mounted on the disk.When the disk is driven to rotate, the tape pulled out from the inner circumference of the multilayer wound tape is
The multi-layered tape is wound again around the outer circumference of the multi-layered tape through the guide roller and the head. When the tape is pulled out, the tape is sent out and the hub is freely rotated. Tightening is less likely to occur,
Also, since the tape pull-out force is small, wow can be reduced.

[0003]

However, in the conventional endless tape cassette, since playback is performed in only one direction, when the deck attempts to play back or fast forward in the reverse direction, the hub is locked, for example. Although it had a rotation prevention mechanism, even if the rotation of the hub was stopped, the rotation of the capstan of the deck did not stop, so there was a problem that the tape was exposed, and both surfaces were reproduced. There is a problem that it is difficult to handle with a walkman or car stereo that is difficult to understand. In the present invention, these conventional drawbacks are intended to be eliminated, and even if the deck attempts to play or fast-forward in the reverse direction, both the hub and the tape are pressed down, the tape is not exposed, and the Walkman or car stereo is not used. As a result, there is no restriction on the deck to be used, and the reliability of the cassette is greatly improved in handling.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a tape cassette in which a tape runs in an endless state in a cassette case, a drive transmission gear on a drive shaft side, and an intermediate gear meshed with the drive transmission gear. And a gear disk that is rotated on the supply shaft side, and a tape wound in a multilayer shape is installed on the gear disk, and the tape is fed out from the inner circumference of the multilayer tape, and the tape is wound around the outer circumference and run. A friction operating member having an operation lever is fitted coaxially with the drive transmission gear,
A stopper having a gear portion meshing with the drive transmission gear at one end and a traveling tape pressing portion at the other end is slidably provided on the case along a guide rib, and the friction operation member and the stopper are operated by the actuation. It is linked by a lever.

[0005]

When the tape cassette is loaded into the cassette recorder, the hub and the disc on the supply shaft side are also rotated by utilizing the rotational force of the reel shaft gear on the drive shaft side.
A torque is generated on the supply shaft side, and the cassette recorder continues to drive as if it judges that there is a tape. On the other hand, since the gear on the drive shaft side meshes with the gear disk via the intermediate gear to transmit torque, if the user tries to reproduce or fast-forward in the reverse direction by erroneous operation corresponding to the auto reverse function,
When the drive transmission gear rotating on the drive shaft side and the intermediate gear rotate in opposite directions, the frictional operating member that is always idling with respect to the drive transmission gear rotates only by the friction of the drive transmission gear, and the operating lever Direction, move the stopper, press the drive transmission gear and the running tape on the guide roller with the gear part and the tape pressing part at the stopper and stop at the same time, let the deck detect the end and stop the deck It is used safely by simultaneously preventing the endless cassette from reversing and preventing the tape from sticking out, and can be used freely even on a walkman or car stereo where it is difficult to know which side to play in handling. Improve.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of the present invention will be described with reference to FIGS. 1 to 3. A tape 2 is wound around a hub 4 on a gear disk 3 on a supply shaft side in a cassette case 1 composed of upper and lower cases. a auto-reverse mechanism corresponding tape cassette taken supply roll is endlessly running state, the gear 3 ₁ provided on the outer periphery of the gear disc 3 for placing the multilayered tape 2 at the feed shaft side, to the gear 3 ₁ meshing with and a power transmission gear 6 that rotates through the intermediate gear 5 drive shaft side of the friction operation member 7 coaxially 6 ₁ of the drive transmission gear 6 actuating lever ₇₁ is projected with fitted, provided with a gear portion ₈₁ which meshes with the drive transmission gear 6 at one end, and the case 1 along the stopper 8 with a traveling tape pressing portion ₈₂ at the other end to the guide pin 10 and the guide rib 12 Slidably mounted on the stopper The in conjunction with the actuating lever ₇₁ in locking notch 11 ₁ is as endless tape cassette.

In this case, the hub 4 is inserted into the center shaft of the gear disk 3 so as to rotate freely.
The tape 2 is wound around the hub 4 in a multilayer shape so as to be mounted on the disk 3. The gear disc 3 is rotated by a take-up shaft of a cassette recorder (not shown) to rotate the multi-layered tape 2 for rotation following the rotating gear. The tape 2 pulled out from the inner peripheral side at P passes through the guide roller 9 and the head Q and is taken up again on the outer peripheral side of the multilayer tape, and travels so that there is no tightness and the pull-out force is small.

[0008] As the friction operation member 7 is a U-shaped or closed end frame of horseshoe along on the shaft ₆₁ as shown in FIGS. 4 and 5, collision at intervals inside the frame periphery the part 7 ₂ multiple axes 6 ₁ of the power transmission gear 6 is provided for example three places
It is constructed so that it can be frictionally fitted to the outer circumference of the shaft by three points of contact. It is designed so that an appropriate torque can be transmitted without requiring large dimensional accuracy in an open shape. Even if the shaft diameter is slightly reduced, the torque is not so large. Yes and so not, the to be idle at all times with respect to power transmission gears 6, and to rotate together with the friction only direction of the operating lever 7 ₁ have to be able to position conversion, the operating lever 7 _The stopper 8 connected to ₁ can be operated along the guide pin 10 and the guide rib 12 through the long groove 11.

[0009] As shown in FIGS. 6 and 7, the friction operation member 7, and an endless annular closed shape portion in place of the open shape thin wall portion 7 _3, the cylindrical body of the three-point contact structure protruding 7 ₂ the use, with the deformation absorbers 7 ₄ the thin walled portion 7 _3, appropriate torque is obtained in the same manner as the previous fabrication on large dimensional accuracy without being requested, and so the dimensional control becomes more pleasure for closed type It is.

[0010] As the stopper 8 has a gear portion ₈₁ which can be engaged with the drive transmission gear 6, the running tape 2 high tape pressing friction coefficient abuts against the section 8 _2, Case 1
An elongated groove 11 is provided slidably along the guide pin 10 and the guide ribs 12, 12 protruding therefrom, and into which the guide pin 10 is fitted. That is, the stopper 8
The gear portion ₈₁ used as the formation of the long groove 11 in the arms of the substantially C-shaped with cut lines 8 ₃ provided in the head, is acceptable hit mountain comrades gear portion ₈₁ of the stopper 8 and the power transmission gear There is room for escape due to the flexibility, and the peaks and valleys of the tooth profile mesh well, so that operation can be performed safely without stopping. Gear portion ₈₁ of the stopper 8, when the head house was lower as shown in FIG. 8, the upper flat surface 8 'which is orthogonal to the sliding direction of the stopper 8, bottom curved surface 8 " The gear is configured to be engaged with and disengaged from the drive transmission gear 6, so that when the ridges of the gears overlap, it is easy to escape so that the operation can be performed with light force and without any biting. And the stopper 8 is prevented from coming off the drive transmission gear 6 at the time of high-speed rewinding, and proper operation is guaranteed.

Furthermore, as the traveling tape pressing portion ₈₂ of the stopper 8, when the stopper 8 is slid so as to stop the tape, guide rollers 9 and the guide rib 12
The tape guide roller 9 is formed of a member having a high coefficient of friction, such as a rubber material or a sponge, along an arc, an inclined shape, or a wedge shape along the outer periphery of the tape guide roller 9 so as to penetrate into the space between the tape guide roller 9 and the tape guide roller 9. When the tape is pressed against the running tape, that is, the stopper slides in the tape running direction, the tape is pressed down, and the tape is strongly stopped. .

Further, the stopper 8 for preventing reverse rotation is provided with:
Set above the drive transmission gear 6, when inverted by auto-reverse mechanism, the gear unit 8 via the actuating lever 7 _{1 1}
Hangs on the gear 6, the drive transmission gear 6 stops,
Tape pressing portion ₈₂ is a tape 2 on one of the guide rollers 9
, The cassette recorder judges that it is the end of the magnetic tape, switches back to the A side (normal), and prevents the reverse running, but the drive transmission gear 6 is disengaged. Alternatively, it may be configured to engage or disengage with the intermediate gear 5, and in any case, one of the torque transmitting gears may be selectively engaged and disengaged so as to have a reverse rotation preventing function.

In FIG. 1, reference numeral 13 denotes a tape guide pin which protrudes from the case 1. 14 is a partition.

[0014] In the embodiment of Figure 1, the gear 6,3 ₁ on both the drive shaft side and the supply shaft side is provided, the intermediate gear 5 of the reel shaft between the transmission gear interposed deployed for the transmission of the driving shaft side torque When three gears are engaged with each other to transmit torque, and when used in a cassette recorder with an automatic reverse (automatic reverse rotation) function, the drive shaft can be stopped by the reverse rotation prevention stopper 8. That is, when the reel reversely rotates due to an erroneous operation, the supply shaft is changed to the drive shaft, and at the same time, the stopper 8 is hung on the transmission gear to stop the rotation, thereby stopping the running. Thus, the vehicle can be switched to the normal running again to prevent reverse running, and can be used as an endless tape cassette that can be used for all cassette recorders having a drive shaft torque of a certain value or more.

[0015] Incidentally, the intermediate gear 5 is installed to balance the gear 6,3 ₁ the supply shaft side and the drive shaft side by the transfer gear, a back tension to the drive shaft side rotational force to the feed shaft side Even if you are running, the rotational force can be transmitted smoothly to the gear disk, and the mechanical noise of the gear drive can be halved by reducing the rotational speed by half, and it can be more than a certain level It can be used without drive shaft torque and can be used for all cassette recorders. Although the intermediate gear 5 has the same number of teeth as the drive transmission gear 6 on the drive shaft side, a gear having a small number of teeth may be used.

[0016]

According to the present invention, a gear is provided on the outer periphery of a disk on which a multilayer tape is mounted on the supply shaft side which is transmitted from the drive shaft side, and an intermediate gear meshing with the gear, and the intermediate gear is transmitted to the intermediate gear. A drive transmission gear that rotates on the side of the drive shaft, a frictional operating member having an operating lever is fitted coaxially with the drive transmission gear, and a gear portion that meshes with the drive transmission gear has one end. In addition, a stopper provided with a running tape pressing portion at the other end is slidably provided on the case along the guide rib, and the friction operating member and the stopper are linked by the operating lever, so that the deck is moved in the opposite direction. When trying to regenerate or fast-forward, that is, when the drive transmission gear rotating on the drive shaft side and the intermediate gear rotate in opposite directions, the frictional operation member that is always idle with respect to the drive transmission gear is driven by the drive transmission gear. of Rotate only by rubbing, change the direction of the operating lever, move the stopper, press down properly on the drive transmission gear and the running tape on the tape guide roller and stop at the same time, let the deck detect the end and stop the deck It is used safely by simultaneously preventing the endless cassette from reversing and preventing the tape from sticking out.It can be used freely even on a walkman or car stereo where it is difficult to understand which side to reproduce in handling, and the reliability of the cassette is improved. It can be used safely for all cassette recorders, has negligible operation during handling, provides nimble operation, and greatly increases durability. Stable operation is ensured without occurrence of tape running abnormality, handling is simple, assembly and manufacture are easy and inexpensive.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention without an upper case.

FIG. 2 is an enlarged perspective view of the stopper of the example of FIG.

FIG. 3 is a plan view of an operation state of the example of FIG. 1, in which A indicates a rotation start state in a reverse direction and B indicates a rotation end state in a reverse direction.

FIG. 4 is a plan view of a member showing a stopper Sado of the example of FIG. 1;

FIG. 5 is a perspective view of the example of FIG. 4;

FIG. 6 is a plan view of another embodiment of the stopper operating member.

FIG. 7 is a perspective view of the example of FIG. 6;

FIG. 8 is an enlarged plan view of the stopper in the example of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Case 2 Tape 3 Gear disk 3 ₁ Gear 4 Hub 5 Intermediate gear 6 Drive transmission gear 6 ₁ shaft 7 Friction operation member 7 ₁ Operating lever 7 ₂ Projection 7 ₃ Thin part 7 ₄ Deformation absorption part 8 Stopper 8 ₁ Gear part 8 ₂ Tape pressing section 8 ₃ cut 9 Tape guide roller 10 Guide pin 11 Long groove 11 ₁ Lock notch 12 Guide rib

Claims (6)

(57) [Claims] In a tape cassette in which a tape runs in an endless state in a cassette case, the tape is transmitted to a drive shaft side via a drive transmission gear and an intermediate gear meshed with the drive transmission gear, and is supplied to the supply shaft. With a gear disk that rotates on the side, a tape wound in a multilayer shape is installed on this gear disk, and it is unreeled from the inner circumference of the multilayer tape,
The tape is wound around the outer periphery and runs, and a frictional operating member having an operation lever is fitted coaxially with the drive transmission gear, and a gear portion meshing with the drive transmission gear is provided at one end. An endless tape cassette comprising: a stopper having a running tape pressing portion provided at the other end thereof slidably provided on a case along a guide rib; and the friction operating member and the stopper are linked by the operating lever. 2. The frictional operation member is a U-shaped or annular frame along the shaft, and a protrusion that contacts the shaft outer periphery of the drive transmission gear is spaced apart from the inner peripheral surface of the frame. 2. The endless tape cassette according to claim 1, wherein a plurality of said endless tape cassettes are provided. 3. The endless tape cassette according to claim 1, wherein the friction operating member is an endless annular frame partly thinned, and a deformation absorbing part is formed in the thinned part. 4. The gear portion of the stopper has a tooth shape in which an upper portion orthogonal to a sliding direction of the stopper when the head house is on a lower side is a flat surface and a lower portion is a curved surface, The endless tape cassette according to claim 1, 2 or 3, which is engaged with and disengaged from the drive transmission gear. 5. The endless tape cassette according to claim 1, wherein the tape pressing portion of the stopper is a member having a high friction coefficient in an arc shape or a wedge shape along the outer circumference of the tape guide roller. 6. The stopper according to claim 4, wherein the stopper comprises a substantially C-shaped arm, and a cut is formed on the head side of the gear portion.
Or the endless tape cassette according to 5.