JPS586219B2 - 2 Main unit case set - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dual reel cassette, in particular a VT
2 of a new structure used in magnetic recording and reproducing devices such as R
Regarding heavy reel cassettes.

Conventionally, the bandwidth of the recording frequency (e.g. 4MHz)
A magnetic recording/reproducing device employing a rotating head cylinder is well known in response to the above requirements.

In particular, so-called helical scan type VTRs are common, in which one recording track corresponds to one field of a television signal at a certain angle to the longitudinal direction of the magnetic tape.

Among them, it is well known that many of the one-head type and two-head type are in practical use.

In the helical scan method using such a rotating head, magnetic tape is spirally wound around the circumferential surface of the cylinder (approximately 360 degrees in the one-head method, approximately 180 degrees in the two-head method). A difference in level occurs between the entrance side and the exit side of the magnetic tape in the cylinder.

Therefore, it is important in this type of technical field to utilize or eliminate such level differences in magnetic tapes.

In addition, the magnetic tape reels are arranged in two layers, one above the other, and the means for driving each tape reel is arranged on a double single-core shaft, and the belt or idler is operated by a switching mechanism, similar to a normal magnetic recording/reproducing device. It is well known to cause the magnetic tape to perform operations such as normal forwarding, fast forwarding, or rewinding.

A so-called two-tiered cassette, in which such two-tiered reels are housed integrally in a case made of plastic, for example, is in practical use.

In this two-tiered cassette, there are no restrictions on which reel is selected as the supply side reel for the magnetic tape, but in any case, the magnetic tape travel path is such that the magnetic tape is directed to either the upper or lower reel. In addition, various cassette-type VTRs (1-reel type, 2-reel parallel reel type, 2-reel double-layer type, etc.) have been announced,
The key points are how to completely hang the magnetic tape inside the cassette on the magnetic tape running system, and how to reduce the number of movable pins. Two points, 4, are important because compatibility between the two is impaired.

Naturally, it is also important to reduce product costs (number of parts and assembly time).

However, at present, there is no one that satisfies all of these points.

Therefore, the main object of the present invention is to provide a dual-reel cassette that is simple in construction, has excellent compatibility, and is inexpensive.

In summary, this invention focuses on the fact that the step difference in the magnetic tape on the cylinder circumferential side and the step difference between both reels due to two-step stacking are approximately the same, and a continuous An internal gear (in this specification, teeth are formed on the inner periphery) is formed as a means of transmitting rotational force with the outside, and the internal gear is continuous or partially missing inside the center hole of the upper reel. The lower reel is formed using the same driving means, with the same internal gear module (or equivalent tooth profile size standard) of both reels, even at different axial positions of the cassette. This is a double reel cassette that can be rotated.

The above objects and other objects and features of the invention will become more apparent from the following brief description with reference to the drawings.

FIG. 1 is an illustrative diagram showing one embodiment of the present invention.
Figure a is a bottom view, Figure 1 b is a front view, Figure 1 c is Figure 1 a.
FIG. 2 is a sectional view taken along line IC-IC' of FIG.

A lower reel 2 and an upper reel 3 are housed in two stacks in a cassette case 1 made of, for example, plastic.

This case 1 is easy to assemble by using, for example, screws, etc., and also has pin holes for positioning it on the main base of the deck, a cover to protect the magnetic tape, and a cover to stop the rotation of the reel. It is equipped with a simple brake device, etc., but it should be pointed out in advance that these are omitted for illustration purposes.

The lower reel 2 has a bottom view shown in FIG.
A continuous internal gear 2a is carved on the inner peripheral surface of the center hole formed by the reel hub.

The upper reel 3 has a bottom view shown in FIG.
An internal gear 3a is carved on the inner peripheral surface of the center hole formed by the reel hub.

The internal gear 2a of the lower reel 2 and the internal gear 3a of the upper reel 3 have the same module (an index indicating the size of the gear teeth), but have different numbers of teeth. It is formed.

Further, the internal gear 2a of the lower reel 2 is formed over the entire width of the inner peripheral surface, and the internal gear 3a of the upper reel 3 is formed only in the upper half of the inner peripheral surface (as shown in FIG. 1C). has been done.

Such lower reel 2 and upper reel 3 are connected to case 1.
They are housed inside the case 1 while being centered and held apart from each other by protrusions formed inside the case 1.

The magnetic tape 4 has one end fixed to the reel hub of the lower reel 2 and the other end fixed to the reel hub of the upper reel 3.

Therefore, this magnetic tape 4 is wound around both reels 2 and 3 and fed or wound around each other, but in this embodiment, the upper reel 3 is used as a supply reel, and the lower reel 2
will be explained as a take-up reel.

Further, although not shown, marks (transparent parts, aluminum foil, etc.) indicating the start or end of the tape are formed at both ends of the magnetic tape 4.

The magnetic tape 4 supplied from the upper reel 3 is wound onto the lower reel 2.

Further, as can be seen from FIG. 1b, the tape guides 5, 5 are configured to guide the lower and upper sides of the magnetic tape 4, and when incorporated into an actual deck, the tape running system is Work as a part.

FIG. 4 is an illustrative view showing the main parts of a magnetic recording/reproducing apparatus into which the cassette of the present invention is installed, with FIG. 4a showing a sectional view and FIG. 4b showing a plan view.

The main base 6 is formed on the top of a magnetic recording/reproducing device such as a VTR, and is configured to mount necessary parts thereon.

The bearing 7 is fixedly fitted into the main base 6, and rotatably supports the outer shaft 9 by outer metals 8, 8 provided therein.

This outer shaft 9 has an outer pulley 10 below the main base 6 and an outer reel stand 11 above the main base 6.
Each is formed integrally with this shaft 9.

As shown in the figure, on the upper surface of the outer reel stand 11, there is an external gear 11a (in this specification, an external gear 11a having teeth formed on the outer periphery) shaped to mesh with the internal gear 2a of the lower reel 2. ) is formed.

The outer shaft 9 has, for example, an internal cavity, and inner metals 12, 12 that rotatably support the inner shaft 13 are provided therein.

Therefore, this inner shaft 13 can rotate independently of the rotation of the outer shaft 9.

An inner pulley 14 is formed below the main base 6 and an inner reel stand 15 is formed above the main base 6, which are integrally formed with the inner shaft 13.

As shown in the figure, on the upper surface of the inner reel stand 15, there is an external gear 1 having a shape that meshes with both the internal gear 2a of the lower reel 2 and the internal gear 3a of the upper reel 3.
5a is formed.

FIG. 5 is a diagram showing the relationship between the cassette of FIG. 1 and the reel stand of FIG. 4. FIG. 5a shows the cassette when it is installed, and FIG. 5b shows the normal meshing state.

That is, the external gear 15 of the inner reel stand 15 in FIG.
5a shows the state in which the external gear 11a of the outer reel stand 11 meshes with the internal gear 2a of the lower reel 2, and FIG.
A state in which the external gear 15a is meshed with the external gear 3a of the upper reel 3 is shown.

In FIG. 5a, the external gear 15a of the inner reel stand 15
has a shape as shown in Figure 4, and the cassette case 1
The internal gear 2a of the inner lower reel 2 has a shape as shown in FIG. 2, and the two gears 15a and 2a mesh with each other because their modules are the same.

By meshing these two gears 15a and 2a, the rotational force of the inner reel stand 15 corresponding to the rotational force applied to the inner pulley 14 via, for example, an idler or a belt, can be transmitted to the lower reel 2. can.

Further, at this time, since the two gears 15a and 2a need to contact and mesh, the center of the cassette and thus the lower reel and the center of the reel stand are positioned eccentrically by a positioning means (not shown).

This positioning means is also used to hold the cassette and the main base 6 at a greater distance than normal.

From the state shown in FIG. 5a, the cassette can be set to the normal meshing state shown in FIG. 5b by pushing down the cassette in the direction of arrow A along the positioning means.

In FIG. 5b, the internal gear 2a of the lower reel 2 and the external gear 11a of the outer reel stand 11 are the same module, and the internal gear 3a of the upper reel 3 and the external gear of the inner reel stand 15 are the same. The module is the same as the gear 15a.

Therefore, the internal gear 2a and the external gear 11a mesh with each other, and the internal gear 3a and the external gear 15a mesh with each other.

By meshing the gears corresponding to 5 in this way, the outer reel stand 11 responds to the rotational force applied to the outer pulley 10.
can be transmitted to the lower reel 2, and the rotational force of the inner reel stand 15 corresponding to the rotational force applied to the inner pulley 14 can be transmitted to the upper reel 3.

Also, at this time, the cassette and therefore each reel 2,
3 and the center of each reel stand 11, 15 coincide with each other.

Further, each of the pulleys 10 and 14 is rotationally driven by an idler, a belt, etc. as described above, and is of course provided with a braking force by a brake device (not shown) as necessary.

6 and 7 are illustrative views showing an example of a magnetic recording and reproducing apparatus in which the present invention is implemented, and FIGS.
Figure a shows a side view, and Figures 6b and 7b show plan views.

In addition, Figure 6 is an illustrative diagram when installing the cassette,
FIG. 7 is an illustrative view showing a normal running condition.

Furthermore, in FIGS. 6 and 7, each of the previously described elements is given the same reference numeral and the explanation thereof will be omitted.

In this configuration, a cylinder 16 containing rotatably supported heads 16a and 16b is further fixed on the main base 6 in relation to the reel stand.

Further, the rotary head cylinder 16 is provided so that its center is inclined as shown in the figure by an angle corresponding to the inclination angle of the recording track formed on the magnetic tape 4 with respect to the longitudinal direction of the tape 4.

Therefore, the magnetic tape 4 is arranged to enter horizontally to the cylinder 16 on the entrance side to the cylinder 16.

In the vicinity of the cylinder 16 on the main base 6, running pins 17, 17 are fixedly disposed on the entrance and exit sides of the magnetic tape 40, respectively, in order to restrict the running of the magnetic tape 40 running around the cylinder 16. will be established.

Also, in the vicinity of the running pin 17 on the entrance side of the main base 6, there is an audio signal on the magnetic tape 4 and a head 16a.
, 16b is provided with a fixed head 18 for recording and reproducing a synchronizing signal for the rotation of the motors.

Between the head cylinder 16 on the main base 6 and the reel stand, a magnetic tape 4 running at a certain inclination angle with respect to the main base 6 around the cylinder 16 is placed. The capstan shaft 20 is provided with a pulley below the main base 6, and rotates at a constant speed to cause the magnetic tape 4 to travel at a constant speed. It is provided perpendicularly to the main base 6.

A rotary arm 21 is rotatably supported on the axis of the cylinder 16, and a rotary drive means (not shown) is used to rotate the arm 21 about the axis of the cylinder 16 in parallel to the main base 6. (linkage device, gear device, etc.).

A pinch roller 22 is rotatably fixed to the tip of the rotary arm 21 by, for example, a ball bearing.

This pinch roller 22 has its outer periphery made of a material with wear resistance and a high coefficient of friction, such as neoprene rubber, and stabilizes the magnetic tape 4 by being pressed against the capstan shaft 20 described above. Let it run.

FIG. 6 shows a state in which the magnetic tape 4 has been pushed out of the cassette case 1 by the required amount.

As mentioned above, in the state shown in FIG. 6, the internal gear 2a of the lower reel 2 in the case 1 is meshed with the external gear 15a of the inner reel stand 15, so it applies rotational force to the inner pulley 14. This lower reel 2 can be rotationally driven by applying the same amount of force.

Therefore, the inner pulley 14 is rotated, and the lower reel 2
By rotating in the direction of arrow B (counterclockwise),
Magnetic tape 4 can be extruded as described above.

In order for the magnetic tape 4 to be extruded in the shape shown in FIG. 6, it is desirable that the main base 6 be vertical and in the direction in which the magnetic tape 4 hangs down (the left side is downward in FIG. 6).

However, even if the main base 6 is horizontal, the ends of the magnetic tape 4 may be formed of a relatively rigid polyester film of about 150 μm, or even if the magnetic tape is made of a less rigid magnetic tape, the motor (Fig. It is also possible to use a combination of wind pressure generated by rotation of a fan (not shown) and a guide.

In any case, it is important that the magnetic tape 4 from the cassette hangs over the rotating head cylinder 16 and into position.

In this way, whether or not the magnetic tape 4 is pressed to a predetermined position can be detected by, for example, the number of rotations of the inner pulley 14.
Or a separate detection means (e.g. photoelectric device, etc.)
It is also possible by

By moving the cassette case 1 in the direction of arrow C in the state shown in FIG. 6, the state shifts to the normal running state shown in FIG. 7.

In FIG. 7, both reels 2 and 3 inside the cassette are set in a state where necessary rotational force can be applied by pulleys 10 and 14.

Further, by the movement of the cassette, the magnetic tag 4 is attached to the circumferential side of the cylinder 160.

Therefore, this magnetic recording/reproducing device is suitable for normal play (Play).
), Fast Forward, Rewind ( R
Various operations such as ewind) are possible.

Furthermore, in FIG. 6, by rotating the rotating arm 21 in the direction of arrow D, the pinch roller 22 provided at the tip thereof comes into contact with the Cag Stan shaft 20, resulting in the state shown in FIG. 7.

That is, by setting the magnetic tape 4 on a predetermined tape running path and pressing the magnetic tape 4 into contact with the capstan shaft 20 and the pinch roller 22, it is possible to obtain a predetermined running of the magnetic tape 4.

Here, the magnetic tape 4 supplied from the upper reel 3 is
The rotary head runs at a certain inclination on the circumferential side of the cylinder 16, and is made horizontal by an inclination pin 19.

Moreover, the magnetic tape 4 returned parallel to the main base 6 by the tilt pin 19 in this way is placed on the capstan shaft 20 and reeled on the lower reel 2 inside the cassette case 1.
, the upper reel 3 is restricted to run with a step equal to the step.

Therefore, the magnetic tape 4 that has exited the capstan shaft 20 and the pinch roller 22 is wound onto the lower reel 2 as it is.

Therefore, normal feeding (recording/reproduction running) is performed by appropriately rotating the pulleys 10, 14, capstan shaft 20, etc. by a rotation drive means (not shown).

Furthermore, when fast forwarding or rewinding the magnetic tape 4, the contact between the magnetic tape 4 and the capstan shaft 20 is prevented by releasing the pressure contact between the capstan shaft 20 and the pinch roller 22 (it is sufficient to create a slight gap). It will be canceled.

In this state, fast forwarding is performed by rotating the lower reel 2 and therefore the outer pulley 10 at a relatively high speed, and winding is performed by rotating the upper reel 3 and therefore the inner pulley 14 in the opposite direction at a relatively high speed. Return is achieved.

In addition, the pulley 10, which is adapted to various operations as described above,
14, etc., can of course be switched by appropriate control means.

Further, when a cassette installed in a magnetic recording/reproducing apparatus is to be removed from the apparatus, the operation described above is reversed.

First, rotate the rotary arm 21 counterclockwise from the state shown in FIG. 7 to the state shown in FIG.
The pressure contact between the capstan shaft 20 and the capstan shaft 20 is released.

Next, move the cassette case 1 upward and
Place it in the position shown.

Furthermore, by rotating the inner pulley 14, that is, the lower reel 2, in the direction in which the magnetic tape 4 being fed out is accommodated in the case 1, that is, in the clockwise direction, the magnetic tape 4 is transferred to the lower reel 2 in the case 1. It is wound up.

In this way, the cassette tape can be removed from the device.

As described above, according to this embodiment, the same internal gear of the module is formed in the center hole of each reel stored in the case in two stacks, and each reel base of the device is provided with the same internal gear of each sole. By forming an external gear that meshes with an internal gear,
Both the upper and lower reels can be rotated by the same reel stand, making it very easy to pull out the magnetic tape from the case or store it in the case.

Furthermore, since no movable pins are required in the tape running system, a double reel cassette with excellent compatibility can be obtained.

Furthermore, since the structure is simple, the product cost is very low.

In the above embodiment, the magnetic tape used in a magnetic recording/reproducing device was explained, but it goes without saying that it can also be used as a magazine for other optical films.

As described above, according to the present invention, a dual reel cassette with a simple structure and excellent compatibility can be obtained at a very low cost.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a schematic structural diagram of an embodiment of the present invention, in which FIG. 1 a is a bottom view, FIG. 1 b is a front view, and FIG. 1 c is a diagram of FIG. FIG. 2 is a sectional view taken along line IC-IC' of FIG. FIG. 2 is a bottom view of the lower reel. FIG. 3 is a bottom view of the upper reel. FIG. 4 is a schematic structural diagram showing the main part (reel stand part) of a magnetic recording and reproducing apparatus to which the present invention is applied, FIG. 4a is a cutaway view, and FIG. 4b is a plan view. FIG. 5 is an illustrative view showing the state of the cassette and reel stand, in which FIG. 5a shows the device when the device is in use, and FIG. 5b shows the state during normal operation. 6 and 7 are schematic structural diagrams showing a magnetic recording/reproducing apparatus as a preferred embodiment of the present invention.
The figure shows normal operation. Further, FIGS. 6a and 7a are side views thereof, and FIGS. 6b and T b are plan views thereof. In the figures, the same reference numerals indicate the same or corresponding parts, 1 is a cassette case, 2 is a lower reel, 3 is an upper reel, 2a, 3a are internal gears, 4 is a magnetic tape, 5
, 5 is the tape guide, 6 is the main base, 9 is the outer shaft,
10 is an outer pulley, 11 is an outer reel stand, 13 is an inner shaft, 15 is an inner reel stand, 11a and 15a are external gears,
16 is a rotary head cylinder, 16a and 16b are magnetic heads, 17 and 17 are running pins, 19 is an inclination pin, 20 is a capstan shaft, and 22 is a pinch roller.

Claims (1)

[Scope of Claims] 1. A case, an upper reel and a lower reel that are stacked and individually rotatably housed on the same axis within the case, and a continuous winding between the upper reel and the lower reel. a tape-like object to be loaded, and for moving the tape-like object between the two reels,
In a two-type reel cassette used in a recording/reproducing device comprising an upper drive means for rotationally driving the upper reel and a lower drive means for rotationally driving the lower reel, the inner peripheral surface of the center hole of the lower reel an internal gear formed on the inner peripheral surface of the center hole of the upper reel to transmit external rotational force to the lower reel; and an internal gear formed on the inner peripheral surface of the center hole of the upper reel to transmit external rotational force to the upper reel. a gear, the number of teeth of the internal gear of the lower reel is greater than the number of teeth of the internal gear of the upper reel, and each of the internal gears is formed by the same module, and the tape-shaped object is The double reel cassette is characterized in that the lower reel is rotationally driven by the upper drive means and a part of the tape-like object is pressed from the case in order to hang it on a traveling system.