JPS6022422B2 - Endless tape cassette device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an endless tape cassette device used for recording and reproducing video signals, for example.

In order to record and reproduce video signals using a head mechanism whose position is fixed, the tape must be run at a high speed of, for example, several meters per second, which significantly increases the amount of tape consumed per unit time. be.

For this reason, the tape is configured to be endless, and the recording/reproducing head of the head mechanism is moved in the width direction of the tape by a minute amount every time the tape runs one round. Specifically, 100 or more tracks are formed in the width direction of the tape, and the tape length is set to be 100 meters or more. For this reason, the tape is stored wound around a reel.In this type of tape device, the tape is stored in a recording/recycling bag to facilitate replacement and to simplify the handling of the tape. It is required to be configured as a cassette.

Furthermore, even when the tape is made into a cassette, it not only simplifies its configuration, but also allows the tape to run stably even when driven at high speed.
Even when 00 or more tracks are formed, integration with the recording/reproducing mechanism is strongly required so that the recording/reproducing head can stably track a predetermined track. The present invention has been made in view of the above points, and particularly provides an endless tape in which a recording/reproducing mechanism and a tape storage guide mechanism are effectively integrated to ensure high-speed running stability of the tape. The present invention aims to provide a cassette device.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1A shows a schematic configuration of this endless tape device. An endless tape 11 is wound around the outer circumference of a reel 12 in a T-ring shape. A tape draw-out window 13 is formed on the inner and outer peripheries thereof, and the inner periphery of the wound tape 11 is led out to the inner periphery of the reel 12.
A head mechanism 14 and a capstan 1 are provided on the inner circumference of the reel 12 in a state where it is loaded into a recording/reproducing mechanism.
5. A tape drive mechanism consisting of a pinch roller 6 is set, and the tape 11 led out from the window 13 is
It is set to be loaded so as to contact the head mechanism 14 and be sandwiched between the capstan 15 and the pinch roller 16, and run as the capstan 15 rotates as indicated by the arrow, and the head mechanism 14 records and reproduces, for example, a video signal. will be carried out. The tape 11 sent out from this tape drive mechanism is guided by a guide plate 17,
18, and is further guided to the taped portion 20 of the guide pole 19, and further guided to the overturn guide 22 that jumps over the reel 12 portion via the guide plate 21, so that it is wound around the outer periphery of the reel 12. Become.

In such a tape device, as shown in FIG. The contact surface of the overturn guide 22 that guides in a bent state and the tape 11 of the guide plate 21 is configured to have a large number of protrusions extending in the width direction of the tape, thereby reducing the contact area with the tape 11. It is configured to be as small as possible.

A in FIG. 2 and FIG. 3 show the main body of the cassette device that stores the endless tape 11, and the reel 1
2 is constructed by machining a thin metal plate, for example, and has a maxim 23 integrally formed on its upper edge toward the outer circumference.

In other words, this maxim 23 effectively executes accurate crimping of the reel 12 and makes the reel 12 strong enough, and also makes the side surface of the tape 11 wound around the outer periphery of the reel 12 It also acts as a protective member.
A bottom plate 12a exists on the opposite side of the reel 12 from the maxim 23, and this bottom plate 12a has a reel base material 2 made of a metal plate.
The tape 11 is wound around the outer periphery of the reel 12 between the reel base plate 24 and the collar 23. In this case, the head mechanism 14, capstan 15, pinch roller 6, etc. set in the recording/reproducing mechanism are attached to the reel board 24 corresponding to the inner periphery of the reel 12 at the closing hole into which the cassette is loaded. 25 is formed. This entrance 25 is formed to include the reel bottom plate 12a. A control plate 26 coaxial with the reel 12 is set on the lower side of the reel board 24, and a control plate 26 is formed with a Sekiguchi 27 corresponding to the Sekiguchi 25 described above.

This control plate 26 is set on the bottom plate 28a of the cassette case body 28 made of plastic material, etc., and has a plurality of guide holes 29a, 29b, and 29c along its circumference. The guide protrusions 30a, 30b, and 30c on the bottom plate 28a are fitted into the control plate 26. That is, the control plate 26 is formed on the bottom plate 28a.
Rotation is controlled coaxially with the reel 12 on the guide string holes 29a to 29c on the reel 8a. A control village 31 is provided on the bottom plate 28a of the case body 28,
When the case body 28 is inserted and loaded into a cassette box of a recording/reproducing mechanism (not shown) as shown by an arrow 32a,
The control village 31 is driven against the spring 31a as shown by an arrow 32b.

The control punch 31 is locked to the locking portion 26a of the control plate 26, and as the arrow 32b of the control hole 31 moves, the control punch 31 is driven to rotate corresponding to the guide pongee holes 29a to 29c. There is. The bottom plate 28a of the cassette case body 28 is formed with a closing opening 33 corresponding to the closing openings 25 and 27, and three closing openings 34a, 34b, and 34c are further set corresponding to the outer peripheral position of the reel 12. be done.

The closing openings 34a to 34c correspond to the rollers set on the cassette loading surface of the recording and reproducing mechanism. Closing openings 35a to 35c are also formed on the reel board 24 so as to correspond to the closing openings 34a to 34c. The roller of the reproducing mechanism supports the lower surface of the winding tape on the outer periphery of reel 12, and
2. Rotation of the winding tape around the outer circumference is performed smoothly. In this case, the control board 26 is also closed 3
6a to 36c are formed.
6a to 36c, when the control punch 31 is moved and rotated as shown by the arrow 32b by loading the cassette, the control punch 34
34c and 35a to 35c, respectively, and when the spring 31a is in a state of returning to its original position, the entrances 34a to 34c and 35a to 35c, which are suitable for the lotus, are sealed.

Here, the openings 34a, 34c and 36a, 36c are set larger than the rollers that support the winding tape, and furthermore, the bottom plate 28a and the control plate 27 are provided with four openings when the control plate 26 rotates against the spring 31a. Threaded through holes 37a, 37b and 38a, 38b are formed.
In other words, set the recording and playback to the cassette setting surface of the machine, and set Sekiguchi 3.
4a, 34c and the through holes 37a, 37b, and when the cassette is loaded, this protruding base corresponds to the closing openings 34a, 34b, the through holes 37a, 37b, the entrances 36a, 36b, and the through hole 38a. , 38b, the reel base 24 is directly supported.

The control board 26 is connected to the reel board 24 and the bottom board 2 as described above.
8a, and the guide protrusions 30a to 30
The rotation is controlled in accordance with c, and the reel board 2
4 is supported on its back surface by the guide protrusions 30a to 30c, and the control plate 26 is set to be rotatable.

The peripheral corner of the reel board 24 is connected to the case body 28.
It engages with the cut grooves 39a to 39d formed in the case body 28, and is fixedly set within the case body 28. reel 1
A guide body 40 integrally molded from plastic is attached to the collar 23 of No. 2.

The guide body 4 has a metal part 41 facing the collar 23, and a plurality of locking claws 42 are formed on this metal part 41, as shown in an enlarged view in FIG. The guide bodies 40 are made to face the respective fixing holes 43 formed in the golden plate 23, and as shown in FIG. 4, the guide body 40 is pressed against the flange 23 and rotated to achieve the abutting fixing. This guide body 40 is
The reel 12 has guide plates 17 and 21 shown in FIG. 1 and a guide ball 19 located on the inner circumference of the reel 12, and a cover 44 is formed corresponding to the tape fastening section 20. By attaching the guide body 40 to the collar 23 of the reel 12 as described above, a guide mechanism for the tape at the inner circumference of the reel 12 is constructed. A in FIG. 5 shows the positioning mechanism of the reel board 24 with respect to the case bottom plate 28a, in which a pair of locking pieces 45a, 45b are set in one direction corresponding to one diameter line X. , and a locking hole 46 is formed therein.

Projections 47 are formed on the surface of the bottom plate 28a in correspondence with the locking holes 46, and locking claws are formed in correspondence with the locking pieces 45a and 45b as shown in enlarged view B in the same figure. 48a, 4
8b so that the reel board 24 is set in an abutting position so as not to rotate with respect to the line x. That is, in collaboration with the mechanism related to the cut grooves 39a to 39d,
The reel board 24 is fixedly set to the case body 28. In this case, the reel board 24 is held and fixed in its thickness direction and rotational direction position with respect to the case body 28 by a locking and abutting mechanism, and there is no tightening and fixing mechanism using screws or the like.

Therefore, due to temperature changes, for example, the reel board 24
Even if the elongation rate changes between the reel base plate 24 and the case body 28, no unnecessary external strain force is applied to the reel board 24, and the reel 12 is always maintained in a normal state. The cassette case main body 28 configured in this manner is sealed with a lid 49 as shown in FIG.
An annular fence 50 is formed in a state that coincides with the above.

Further, the openings 25 and 33 formed in a state that fits over the reel board 24 and the bottom plate 28a of the main body 28 are provided with elevator bodies 51 and 52 for sealing them.

These elevator bodies 51 and 52 are rowing guides 5
Tape 1 set as shown in B in Figure 1 by 3 etc.
1, and is set to be movable up and down by a plurality of guide poles 54a, 54b, etc., and is normally moved by springs 55a, 55b interposed between it and the lid body 49. It is biased toward the bottom plate 28a, and is set to close the openings 25 and 33. When this cassette is loaded into the recording/playback mechanism, the sixth
As shown in A in the figure, Sekiguchi 2 is pushed up by the push-up body 56 and sets the head mechanism and tape drive mechanism.
5 and 33 will be set as Hotsu. in this case,
The elevator bodies 51, 52 are provided with locking claws 57 as shown in an enlarged view at B in FIG.
2, it engages with a locking cam 58 formed on the control plate 26, and when a cassette is not loaded, it prevents the elevator bodies 51, 52 from rising and releases the sealing state of the gates 25, 33. I'll try to avoid it.

That is, when this cassette is inserted into a cassette box to be delivered to a recording/reproducing mechanism, the control punch 31 is driven in the direction of the arrow 32b against the spring 31a, and the control plate 26 is rotated accordingly. .

Then, the locked state of the elevator bodies 51 and 52 is released, and at the same time the sekiguchi 36a to 36c and the through hole 3 are released.
8a, 38b are Sekiguchi 35a-35c, 34a-34c
, and a state suitable for filling the through holes 37a and 37b is set. When the cassette box is set in the recording and reproducing mechanism section in this state, the push-up body 56
The elevator bodies 51 and 52 are pushed up and the head mechanism 14, capstan 15, and pinch q-ra 16 are set on the inner circumference of the reel 12 via the sekiguchis 25 and 33 as shown in FIG. At this time, as shown in FIG. 7, the protruding bases 59a, 59b, .
, 34c, 36a, 36c and through holes 37a, 37b,
It is inserted through 38a and 38b, and directly supports the reel board 24.

FIG. 8 shows a state in which the lid body 49 is attached to the case body 28, and the fence 50 is attached to the elevator body 51,
Even when the bottom plate 28a is closed by pushing up the bottom plate 52, the bag portion of the tape 11 on the outer periphery of the reel 12 is partitioned.

That is, the inflow of external air into the storage portion of the tape 11 is effectively prevented, so that the storage tape 11 is not affected by external air. In addition, a tape pressing bar 60 is provided on each of the four guide bodies.

This lever 60 has a bearing 61 formed on the guide body 40.
The shaft 62 is set at the top, and as shown in FIG. 9AB, the pressing part 6 is made of an elastic material such as felt.
3, the winding tape 11 is aligned by pressing the upper surface of the winding tape 11 on the outer periphery of the reel 12. For example, when the tape starts running, a force shown by an arrow 64 is applied, and the pressing part 6
3 to facilitate running and rotation of the tape 11.
In addition, during normal running, the bimetal spring 65 presses the winding tape 11 to align it, and the force exerted by the bimetal spring 65 is changed depending on the temperature. Specifically, when the temperature rises and the tape 11 is stretched, the tape shown in FIG. The amount of tape cracking at the fastening portion tends to increase. At this time, the pressing force of the pressing part 63 is reduced to smooth the rotation of the tape 11 on the outer periphery of the reel 12, thereby reducing the amount of tape scraping. On the other hand, when the temperature drops and the tape 11 shrinks, reducing the amount of tape retained, the pressing force of the pressing portion 63 is increased. That is, according to the cassette device configured as described above, the reel board 24, which is integrated with the reel 12 for storing tape, is fixedly held in the cassette case 28 and installed in the recording/reproducing mechanism. It comes to be directly supported by the protruding bases 59a, 59b, . . .

In a typical tape cassette, a tape storage section including a reel mechanism is held in a cassette case made of plastic or the like, and the cassette case is loaded and held in a recording/reproducing mechanism. Therefore, in such a tape cassette, the relative positional relationship between the tape, the head mechanism of the recording/playback mechanism, and the tape drive mechanism is as follows:
It depends directly on the accuracy of the cassette case. For this reason, for example, when forming a large number of tracks at minute pitches in the tape width direction as described above, it is difficult to stably perform tracking of the recording/reproducing head. However, as described above, the protruding bases 59a and 59 are set integrally with the head mechanism etc. in the recording and reproducing mechanism.
b directly supports the reel board 24 that stores and holds the tape 11 and guides it, so that the relative relationship between the head mechanism and the guided tape 11 can always be set with high precision and stability. As a result, the tape 11 can be controlled to run stably at high speed, and tracking control relative to the recording/reproducing head can be effectively executed with high precision.

In this case, the cassette case is usually set in a direction in which it comes into pressure contact with the recording and reproducing mechanism part by a spring mechanism, and the reel board 24 is always in contact with the protruding bases 59a, 59b, etc., and the cassette case is in the loaded state. The relative positional relationship in can be set reliably and accurately, and the accuracy of the cassette case, which is a plastic molded product, is within a sufficient tolerance range.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating an endless tape device related to the present invention, where A is a plan view, B is a partially cutaway view of the tape storage section, and A in FIG. 2 is an embodiment of the present invention. A perspective view showing the main body of the cassette rhombus according to the example, FIG. 3 is a view showing the lid, FIG. 3 is an exploded view of the main body, and FIG. FIG. 5A is a diagram showing the attachment structure of the reel board, FIG. 5B is an enlarged view of the attachment locking part, and FIG. A diagram showing the foundation structure of the body part, B is a diagram showing the locking structure thereof, FIG. 7 is a diagram explaining the loading foundation for the recording and reproducing mechanism, FIG. 8 is a diagram showing the cross-sectional structure of the cassette case, FIG. 9 is a diagram showing the tape pressing machine, in which A is a side view and B is a perspective view. DESCRIPTION OF SYMBOLS 11...Tape, 12...Reel, 13...Tape drawer window, 14...Head mechanism, 15...Cab stun, 16...Pinch roller, 23...Maximum, 24...Reel board, 26... Control board, 28... Case body, 28
a... Bottom plate, 34a to 34c, 35a to 35c, 36
a~36c...Closed, 37a, 37b, 38a, 38b・
...Through holes, 59a, 59b... Protruding base. Figure 1 Figure 4 Figure 7 Figure 2 Figure 5 Figure 3 Figure 6 Figure 8 Figure 9

Claims (1)

[Claims] 1 Equipped with an annular reel around which an endless tape is wound, a reel board to which this reel is fixed, and a cassette case that stores the reel board to which this reel is attached, and the reel board is placed on the bottom plate of the cassette case. In addition to setting the position, a plurality of through holes are formed in the case bottom plate to reach the reel board surface, and a protruding base set on the cassette loading surface of the recording/reproducing mechanism supports the reel board bottom surface through the through holes. An endless tape cassette device featuring: