JPH0654577B2 - Cassette type magnetic recording / reproducing device - Google Patents

Description

The present invention relates to a cassette type magnetic recording / reproducing apparatus.

(Prior Art) In recent years, the applications of cassette type magnetic recording / reproducing devices have diversified,
Various types have been devised according to the application. Among them, there is a type in which a rotary head cylinder is arranged in a direction substantially perpendicular to the direction in which a magnetic tape is pulled out from a cassette.

A conventional cassette type magnetic recording / reproducing apparatus will be described with reference to FIGS. FIG. 5 and FIG. 6 are a plan view and a side view, respectively, of a conventional tape pull-out portion, and FIGS. 7 and 8 are an auxiliary plan view and a side view for explaining the operation.

In FIG. 5, the magnetic tape 2 stored in the cassette 1
Is attached to the pair of reel bases 3 by a chain line. An erasing head 4 which will be described later is drawn on the upper left side of the cassette 1.

A feed screw 9 having a worm gear 8 at one end is rotatably mounted on two supporting bases 6 and 7 mounted on the substrate 5, and a guide shaft 10 is mounted parallel to the feed screw 9 described above.

The feed table 11 having the guide portion 11a that slides on the guide shaft 10 is
An engaging pin 13 that engages with the feed groove 12 formed on the feed screw 9 is provided from the lower surface thereof, and moves left and right as the feed screw 9 rotates.

A drive rod 14 held slidably with respect to the substrate 5 in parallel with the guide shaft 10 drives rotating arms 15 and 16 to be described later at the right end rear side and the center front side, respectively. The racks 17 and 18 are also formed with a hook portion 19 that engages with the above-described feed base 11 at the left end thereof, and are constantly biased to the right by a tension coil spring 20 attached to the right end.

A rotating arm 15 having a rotatable tension roller 21 attached to its tip has a sector gear 22 fixed to its rear end, and is pivotally attached to the substrate 5 concentrically with the axis of the sector gear 22. ing. In the fan gear 22, the idle gear 23 meshing with the fan gear 22 and the small gear 24 meshing with the rack 17 on the rear side of the right end portion of the drive rod 14 are sequentially meshed with each other, so that the sliding of the drive rod 14 of the rotating arm 15 is prevented. Convert to rotation.

Rotating arm 16 with tension post 25 fixed to the tip
At the rear end, the above-mentioned drive rod 14 at the center front rack 18
A rotary shaft 27 having a small gear 26 meshing with is fixed,
It is rotatably mounted on the substrate 5 concentrically with the axis of the rotating shaft 27,
It rotates according to the sliding movement of the drive rod 14.

The swinging arm 29, on which the pull-out roller 28 is rotatably mounted at the tip, has a joint pin 30 at the center thereof and a connecting arm 31 whose one end is rotatably mounted on the upper left corner of the feed base 11. A sliding pin 32 rotatably supported at the other end, and swingably supported by the feed base 11 at the rear end.
Is stuck. The other end of the tension coil spring 33 attached to the sliding pin 32 is fixed to the right end of the feed base 11 and always urges the swing arm 29 and the connecting arm 31 in the opening direction. The substrate 5 is provided with a stopper 34 that engages with the above-mentioned sliding pin 32, and the feed table 11 shown in FIG.
Is located at the end of the feed screw 9, it pushes the sliding pin 32 to close the swing arm 29 and the connecting arm 31.

A stopper 35 for restricting the sliding position of the feed base 11 is fixed to the support base 7 on the left side, and a worm 36 meshing with the worm gear 8 of the feed screw 9 is attached rotatably. There is. The worm 36 is connected to a loading motor (not shown).

In FIG. 7 (a), a loading ring 38 having a gear 37 fixed to the lower end surface thereof has a pull-in roller 40 which rotates in conjunction with a pinch roller 39 on the upper end surface thereof and two rotatable guide rollers 41 and 42. , The guide posts 43 are installed,
A drive gear 44 connected to a loading motor (not shown) meshes with the gear 37 and is driven.

Inside the loading ring 38, a rotary head cylinder 45 incorporating a magnetic head (not shown), a voice erasing head
46, voice control head 47, two guide posts 48 and 49 around the rotary head cylinder 45, the voice control head
One guide post 50 alongside 47 and capstan
51 are arranged on the substrate 5, respectively. A guide roller 52 is rotatably mounted on the substrate 5 at the upper left end of the cassette 1.

The operation of the cassette type magnetic recording / reproducing apparatus configured as described above will be described.

In FIG. 5, the cassette 1 is mounted on the reel stand 3,
When the loading motor rotates, the feed screw 9 rotates clockwise from the support base 7 toward the feed base 11 via the worm 36 connected to the motor. The feed base 11 including the engagement pin 13 that engages with the feed groove 12 of the feed screw 9 moves leftward as the feed screw 9 rotates. When the feed table 11 moves to the left, the sliding pin 32 moves relative to the feed table 11 in the right direction by the pulling force of the tension coil spring 33, and the swing arm 29 and the connecting arm 31 are linked. The magnetic tape 3 is pulled out from the cassette 1 by rotating in the direction of arrow A by the mechanical operation.

Subsequently, the feed table 11 moves to the left while pulling out the magnetic tape 2 from the cassette 1 by the pull-out roller 28, the tip end thereof hits the hook portion 19 of the drive rod 14, and this is attached to the rear end of the tension coil spring. Slide to the left against the pulling force of 20. When the drive rod 14 slides to the left, the rack 18
The rotating arm 16 to which the small gear 26 that meshes with is fixed in the counterclockwise direction, and the small gear 24 and the idle gear 23 that mesh with the rack 17.
The rotating arms 15 to which the fan-shaped gears 22 meshing with each other are fixedly rotated simultaneously in the clockwise direction.

FIG. 7A shows a state in which the feed base 11 is engaged with the stopper 35 of the support base 7 and stopped. The magnetic tape 2 pulled out by the pull-out roller 28 is stretched as shown by a tension post 25 and a tension roller 21 attached to the tips of the two rotating arms 16 and 15.

Next, the drive gear 44 connected to the loading motor rotates, the loading ring 38 rotates counterclockwise,
Pull-in roller mounted on loading ring 38
The magnetic tape 2 comes into contact with the inside of the loop of the magnetic tape 2 and is pulled in so as to be wound around the rotary head cylinder 45. Fig. 7 (a)
The position of the magnetic tape 2 indicated by the alternate long and short dash line in FIG. 8 is the state in which the loading ring 38 is rotated by approximately 90 °, and FIG. 7 (b) is the state in which it is further rotated by approximately 180 ° in FIG. a) and
(b) shows the state of the final position of rotation. That is, with the rotation of the loading ring 38,
The magnetic tape 2 is wound around the rotary head cylinder 45, the voice erasing head 46, the voice control head 47, and the guide post 50 by the pull-in roller 40, and the magnetic tape running path shown in FIG. Is pressed against the capstan 51 and the magnetic tape runs.

(Problems to be Solved by the Invention) However, in the above-described configuration, the pull-out roller 28
A driving device including a feed screw 9, a guide shaft 10, a feed base 11 and the like for driving the magnetic head is arranged between the magnetic tape 2 and the substrate 5, and a loading ring 38 and a pinch roller are provided.
39, it is necessary to widen the gap between the magnetic tape 2 and the substrate 5 in order to secure a margin for avoiding contact with the drawing roller 40 and the like. Therefore, not only can the size of the cassette-type magnetic recording / reproducing apparatus in the tape width direction be reduced, but also all parts that regulate the tape running, such as the guide roller 52 and the tension post 25, are far from the substrate 5. However, the mounting accuracy and stability are extremely poor, and it is difficult to obtain good recording and reproducing performance.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and an object of the present invention is to provide a cassette type magnetic recording / reproducing apparatus which has a significantly reduced size in the tape width direction and has excellent recording / reproducing performance.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, a guide device of a pull-out roller for pulling out the magnetic tape from the cassette toward the rotary head cylinder is provided on the opposite side of the substrate with the magnetic tape interposed therebetween. The distance between the substrate and the tension post, the tension roller, the guide roller, etc. for restricting the tape running is shortened by arranging the substrate at the substrate.

(Operation) According to the present invention, the guide device for the pull-out roller for pulling out the magnetic tape does not come into contact with other running parts such as the loading ring and the pinch roller, and therefore the guide roller, the tension post and the tension roller are mounted. Since the rotating arm and the like can be arranged close to the substrate, it is easy to secure the mounting accuracy and excellent stability is obtained.

Further, a space for mounting the cassette pressing device, its locking device, etc. is always required above the cassette mounting portion.
Therefore, in the space on the opposite side of the substrate with the magnetic tape sandwiched between them, there is a space in which nothing is arranged except the above cassette mounting device, and the guide device for the pull-out roller is arranged in this space. , No need for new installation space. Further, since there is no space for avoiding contact with the loading ring or the like, the size of the cassette type magnetic recording / reproducing apparatus in the tape width direction can be significantly reduced.

(Example) A cassette type magnetic recording / reproducing apparatus of the present invention will be described with reference to FIGS. 1 to 4. 1 and 2 are a plan view and a side view of a tape pull-out portion according to the present invention, FIG. 3 is a plan view of a tape pull-out completion, and FIGS. 4 (a) and 4 (b) show a pull-out arm and a guide rail. It is a detailed view of an engaging part.

In FIG. 1, a magnetic tape 2 stored in a cassette 1
Is attached to the pair of reel bases 3 by a chain line.

In FIG. 1 and FIG. 2, two supporting wheels 53 and 54 mounted on the board 5 are provided with two grooved wheels 55 and 56, respectively.
Is rotatably mounted, and a drive rope 57 is stretched around these grooved wheels 55 and 56 in a rectangular shape. An engagement piece 59 for driving a drive rod 58, which will be described later, is fixed to the drive rope 57.

A guide rail 62 having a U-shaped cross-section with a hook-shaped portion formed at the tip is attached to the two columns 60 and 61 planted in the substrate 5, and the drive rope 57 is mounted in the U-shaped frame. It is stretched.

In FIG. 4, a guide groove 63 formed in the inner surface of the frame of the guide rail 62 is engaged with a guide pin 66 of an engaging pin 65 of a pullout arm 64 having a pullout roller 28 rotatably mounted at its tip, Moreover, the tip end of the engaging pin 65 is locked to the drive rope 57, and the pull-out arm 64 slides along the guide groove 63 of the guide rail 62.

Returning to FIG. 1 and FIG. 2, the drive rod 58 having the guide slit 68 engaging with the two guide protrusions 67 planted on the substrate 5 has the rack 69 on the front side and the drive rod 58 on the rear side. A bent portion 70 provided with a slit (not shown) through which the drive rope 57 is inserted so as to engage with the above-described engagement piece 59 fixed to the drive rope 57 is formed, and is attached to the left end thereof. It is biased to the left by the tension coil spring 71.

A rotating arm 72 having a rotatable tension roller 21 mounted at its tip has a pinion 73 meshing with the rack 69 fixed to its rear end, and is rotated to the substrate 5 concentrically with the axis of the pinion 73. It is movably mounted and rotates according to the sliding movement of the drive rod 58.

Rotating arm 74 with tension post 25 fixed to the tip
Is a gear 76 that is rotatably mounted on the base plate 5 and meshes with a small gear 75 that meshes with the rack 69. The gear 76 is rotatably mounted on the base plate 5 concentrically with the axis of the gear 76. It rotates according to the sliding of the rod 58.

The drive rope 57 is driven by a loading motor (not shown) connected to the grooved wheel 56.

Since it is the same as the conventional example except for the tape pull-out section described above,
The description is omitted.

The operation of the cassette type magnetic recording / reproducing apparatus configured as described above will be described.

As shown in FIG. 1, the cassette 1 is mounted on the reel stand 3,
When a loading motor (not shown) rotates, the loop of the drive rope 57 shown in FIG. 2 is driven by the above motor to rotate counterclockwise.

When the pullout arm 64 fixed to the engagement pin 65 locked to the drive rope 57 moves leftward as the drive rope 57 rotates,
As the guide pin 66 moves along the hook-shaped portion of the guide rail 62, the pull-out arm 64 rotates in the direction of arrow B, and the pull-out roller 28 attached to the tip of the pull-out arm pulls out the magnetic tape 2 from the cassette 1. Continue pulling straight to the left.

The drive rope 57 continues to rotate, and the engaging piece 59 fixed to this
Is engaged with the bent portion 70 of the drive rod 58, the drive rod 58
Starts moving in the right direction against the tension coil spring 71. A rack 69 formed on the drive rod 58 rotates two pinion gears 73 and 75 meshing with it in a clockwise direction, and a rotating arm 72 fixed to the pinion gear 73 is rotated clockwise to form a gear 76 meshing with the pinion gear 75. The fixed rotating arms 74 rotate counterclockwise, respectively, and the tension rollers attached to the respective tip ends.
The magnetic tape 2 that has been pulled out is pulled out from the inside by the 21 and the tension post 25 so as to expand.

On the other hand, the pull-out arm 64 further moves to the left, and when the engaging pin 65 reaches the left end of the guide rail 62, the pull-out of the magnetic tape (not shown) is completed, and the solid line in FIG. It becomes the position of the magnetic tape 2 shown by. Thereafter, the operation of pulling the magnetic tape 2 toward the rotary head cylinder 45 is the same as in the conventional example.

(Effect of the Invention) According to the present invention, it is possible to dispose the guide device for the pull-out roller in an unused space above the cassette,
By improving the mounting accuracy and stability of the tension roller, tension post, guide roller, etc. that regulate the tape running, not only excellent recording and reproducing performance can be obtained, but also the size of the device in the tape width direction can be significantly reduced. Thus, it is possible to obtain a compact cassette type magnetic recording / reproducing apparatus having excellent recording / reproducing performance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are a plan view and a side view of a drawer of a cassette type magnetic recording / reproducing apparatus according to the present invention, and FIG. 3 is a plan view showing the completion of the drawer, and FIG. (a) and (b) are a partial enlarged view and a sectional view of the guide rail and the drawer arm, FIGS. 5 and 6 are a plan view and a side view of a drawer portion of a conventional example, and FIGS. b) and FIGS. 8 (a) and 8 (b) are a plan view and a side view for explaining the progress of the operation of the conventional pull-out portion and pull-in portion. DESCRIPTION OF SYMBOLS 1 ... Cassette, 2 ... Magnetic tape, 3 ... Reel stand, 4 ... Erase head, 5 ... Substrate, 6,7,53,54 ... Support stand, 8 ... Worm gear, 9 ... Feed screw, 10 ... Guide shaft, 11 ... send,
11a ... Guide portion, 12 ... Feed groove, 13,65 ... Engaging pin, 14, 58 ...
Drive rods, 15, 16, 72, 74 ... Rotating arms, 17, 18, 69 ... Racks, 19 ... Hook portions, 20, 33, 71 ... Tension coil springs, 21 ... Tension rollers, 22 ... Fan gears, 23 ... Idler gear, 24,26,73,7
5 ... Small gear, 25 ... Tension post, 27 ... Rotating shaft, 28 ...
Drawer roller, 29 ... Swing arm, 30 ... Articulation pin, 31 ... Connecting arm, 32 ... Sliding pin, 34, 35 ... Stopper, 36 ... Worm, 37, 76 ... Gear, 38 ... Loading ring, 39 ...
Pinch roller, 40 ... Pull-in roller, 41, 42, 52 ... Guide roller, 43, 48, 49, 50 ... Guide post, 44 ... Drive gear, 45 ... Rotating head cylinder, 46 ... Voice erasing head, 47 ... Voice control head , 51 ... Capstan, 55, 56 ... Groove, 57 ... Drive rope, 59 ... Engagement piece, 60, 61 ... Strut, 62 ... Guide rail, 63
... guide groove, 64 ... drawer arm, 66 ... guide pin, 67 ... guide protrusion, 68 ... guide slit, 70 ... bent portion.

Claims (1)

[Claims] 1. A cassette type magnetic recording / reproducing apparatus in which a rotary head cylinder is arranged in a direction substantially orthogonal to a direction in which a magnetic tape is pulled out from a cassette, and a guide of a pulling roller for pulling out the magnetic tape from the cassette in the direction of the rotary head cylinder. A cassette type magnetic recording / reproducing apparatus characterized in that the apparatus is arranged on the opposite side of the mounting surface of the cassette with a magnetic tape interposed therebetween.