JPS608544B2 - Cartridge for magnetic sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cartridge for magnetic sheets, and more particularly to an improvement in a cartridge that accommodates a magnetic sheet so as to be capable of magnetic recording and reproduction therein.

The magnetic sheet referred to in the present invention is usually a flexible, non-magnetic support with a thickness of 3 mm to 1 side, such as a plastic sheet made of polyethylene terephthalate, cellulose triacetate, etc., with ferromagnetic powder coated on one or both sides. A magnetic coating liquid made of a binder, lubricant, solvent, etc. is applied to a thickness of 0.
After layering a magnetic layer with a thickness of 0.05mm to 100mm, and further layering a protective layer and an antistatic layer depending on the application, the support is prepared with an inner diameter of 3mm to 5mm and an outer diameter of 100mm to 100mm. A magnetic sheet obtained by cutting into a donut shape of 50 yen is used for a magnetic sheet recording and reproducing apparatus (hereinafter referred to as "VSR").

) (inserting and fixing the rotating shaft into the inner diameter of the VSR), and the rotation of the rotating shaft and the cushioning effect of the centrifugal force and the airflow on the lower surface of the magnetic sheet are applied to the VSR substrate. While maintaining a small but constant gap above, it floats horizontally like a single IJ jet disk and continues to rotate, and the magnetic head of the VSR also performs magnetic recording or recording on the magnetic layer. This is what is generally called a self-levitating magnetic sheet. This self-levitating magnetic sheet has an extremely thin support and each coating film, and the support has a flexible structure. Therefore, when it is stored or when it is attached to or removed from the VSR, scratches, creases, dust, etc. that make the playback output unstable are likely to occur and adhere to the surface. Various jackets or cartridges have been proposed.

In particular, the cartridge that rotatably stores the magnetic sheet inside the cartridge is manufactured by
As disclosed in No. 3, after a catch or a retainer that can freely engage with the upper end of the rotating shaft of the VSR is fixed to the central entrance of the magnetic sheet, a A closed part having a diameter large enough to allow the rotating shaft to play, and an opening in the shape of a hole that allows the magnetic head to be inserted and scanned are provided respectively, and an exhaust hole is provided in the side plate. The magnetic sheet is stored in a container shaped like a so-called "cartridge" with a slight gap between the top and bottom.

Next, when magnetic recording or reproduction is performed on the magnetic sheet in the VSR, the cartridge containing the magnetic sheet is placed on the substrate of the VSR, and passed through the central opening formed in the lower slope to the rotating shaft. After the magnetic sheet is engaged with the seat or retainer, the magnetic sheet is rotated and floated within the cartridge by rotating the rotating shaft, and magnetic recording or reproduction is performed from the magnetic head. Ta. As mentioned above, the magnetic sheet that rotates and levitates within the cartridge is caused by the centrifugal force and the cushioning effect of the airflow that enters from the center openings of the lower and upper plates and flows out from the exhaust holes of the side plates. The lower plate floats above the top with a slight but uniform gap, and the lower plate is equivalent to the VSR substrate in magnetic sheet recording/reproducing operations that do not use cartridges (conventional VSR operations described at the beginning). and the upper plate,
By covering the magnetic sheet with the lower plate and the side plate, harmful scratches, creases, etc., which occur when the magnetic sheet is stored and attached to and removed from the VSR, are prevented from occurring. However, the conventional cartridge described above has the following drawbacks.

{1} When the flatness of the lower slope decreases due to an increase in the number of times the cartridge is used, etc., and the amount of deformation gradually increases, the rotational levitation of the magnetic sheet on the lower plate becomes unstable, In the worst case, the magnetic sheet comes into sliding contact with the lower plate, causing harmful scratches, dust, folds, wrinkles, etc. on the surface of the magnetic sheet.

[21] On the other hand, in order to prevent the deformation of the lower plate as described above, it is necessary to limit the number of cartridges that can be stacked and stored, resulting in an increase in storage space for the cartridges.

'3' Since the cartridge stores the magnetic sheet with a slight gap in the vertical direction of the magnetic sheet and is free to move to some extent, if the cartridge is handled roughly, the inside of the cartridge may There was a drawback that the magnetic sheet came into strong sliding contact with the inner surface of the cartridge, causing harmful scratches, creases, dust, etc., and adhesion.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the conventional cartridges described above and to provide a cartridge in which the magnetic sheet can be stably stored, stored, and reused.

The object of the present invention is to incorporate a flat board in which a rotor supported rotatably by a bearing is attached to the central part, and a plurality of ventilation holes are provided around the central part. This is achieved by a magnetic sheet cartridge characterized by:

Hereinafter, one embodiment of the cartridge of the present invention will be described in detail based on the attached drawings.

In FIG. 1, a VSR" has a substrate 2 with a transparent opening 3 in the center, a motor 4 disposed below the substrate 2, and an upper shaft extending through the opening 3 and protruding onto the substrate 2. an output shaft 5 of the motor, and a magnetic head (not shown);
It is equipped with the following.

The cartridge 10 according to the present invention has the closing part 3 in the center.
The upper plate 12 has an opening 13 having a diameter equal to or larger than , and an elongated hole 14 for inserting a magnetic head extending in the radial direction slightly apart from the opening 13. A lower plate 15 has a cutout part 16 having the same diameter as the part 13, and a side plate 17 has a plurality of exhaust holes 18 formed in the upper part.
, a flat container 11 consisting of a flat container 11, and a rotor 2 rotatably supported in the center by a ball bearing 201.
1 is installed, and a plurality of ventilation holes 22 are provided in the vicinity of the rotator 21, and a plurality of protrusions 23 are provided horizontally protruding from a substantially rectangular green outer periphery. As shown in FIG.
a and a guide means 24 for guiding and regulating the vertical movement of the protrusion 23 by means of a lower surface 26a of a stop member 26 fitted above the guide longitudinal groove 25.

Note that the rotor 21 and the upper end of the output shaft 5 are constructed as shown in an enlarged manner in FIG. 2.

That is, the rotator 21 has a screw 29 screwed therein to fix the periphery of the center hole Sa of the magnetic sheet S to the seat 28 slightly protruding from the upper surface of the substrate 19, while being screwed downward by the snap ring 20a. A cylindrical coupling portion 30 is pivotally attached using a pin 31 below the journal portion which is supported by the ball bearing 20 whose movement is suppressed. Further, the output shaft 5 engages with a groove 32 cut out in an L-shape upward from the bottom of the coupling member 30 at the upper end thereof, so that the output shaft 5 rotates. A connecting pin 33 is installed so as to be able to transmit the following information. Further, the guide means 24 is fixed along the inner wall of the side plate 17 at a position where it does not overlap with the exhaust hole 18 with adhesive or screws, and furthermore, the guide means 24 is fixed to a lower surface 25a of the guide groove 25 and a lower surface 26a of the stop member 26. is the substrate 19
The upper end of the screw 29 and the lower end of the coupling member 38 are positioned so as to prevent them from protruding outside from the adjacent entrances 13 and 16, respectively, as the screw 29 moves up and down.

Each member of the cartridge 10 is preferably made of a non-magnetic material, and in particular, the substrate 19 is made of metal or a plastic material treated with antistatic treatment in order to reduce the adhesion of the magnetic sheet S due to static electricity. Furthermore, it is desirable that the guide means 24 be made of a plastic material having lubricity.

Next, the effect will be explained.

First, the upper plate 12 of the container 11 is removed, and the center hole Sa of the magnetic sheet S with the magnetic layer surface facing upward is attached to the upper end of the rotator 21, and the seat 28 and the screw 29 After fixing the area around the center hole Sa, the upper plate 11 is attached and the container 11 is closed, completing the storage of the magnetic sheet S into the cartridge 01.

The cartridges 8' containing the magnetic sheets S are stored piled up in large quantities, and the upper plate 12 or the lower plate 1
Even if the guide means 5 is slightly deformed due to the load loaded on the vehicle, the guide means 2
The magnetic sheet S, whose vertical movement is regulated within a certain range and supported by four legs, and whose central hole Sa is fixed to the upper end of the rotator 21 on the upper surface of the substrate 19, is attached to the cartridge 10. Since the magnetic layer is stored in a stable storage condition with almost no difference from the storage condition when storage is completed, harmful scratches, creases, etc. may occur on the magnetic layer surface due to sliding contact with the inner surface of the upper plate 12. is prevented.

Next, when performing magnetic recording or reproduction on the magnetic sheet S by the VSRI, the coupling pin 33 of the output shaft 5 is inserted into the coupling member 3 from the entrance part 16 of the downward slope 15.
The cartridge 10 is placed on the upper surface of the VSRI substrate 2 so as to engage with the groove 32 of the output shaft 5, and the coupling pin 33 extends in the groove end portion of the groove 32 in a direction opposite to the rotational direction C of the output shaft 5. When the base plate 19 is held on the lower surface 25a of the guide groove 25, the set height of which is slightly lower than the top of the coupling pin 33, the base plate 19 is pushed up slightly by the output ball 5. The projection 23 is guided in upward movement by the guide groove 25, and is displaced while keeping the substrate 19 substantially horizontal.

Therefore, the substrate 19 has no relation to the flatness of the upper plate 2 or the lower plate 15 (although if significant deformation occurs, the guide means 24 will also become oblique, so it cannot be ignored)
The magnetic sheet S is supported horizontally.

After the attachment of the magnetic sheet S to the VSRI is completed, when the output shaft 5 is rotated in the direction of arrow C, the magnetic sheet passes through the coupling pin 32, the groove 33, the coupling member 31, and the rotator 21. The rotation of the output shaft 5 is transmitted to the magnetic sheet S, and while rotating in the direction of the arrow C, the magnetic sheet S is rotated by the centrifugal force and the gate portions 3 and 16 and the ventilation hole 22.
Due to the cushioning effect of the air flow D, which passes sequentially through the upper surface of the substrate 19 and the lower surface of the magnetic sheet S, and is discharged from the exhaust hole 18, a small amount (usually , 20~1000 1) It floats with a gap and the upper plate 12 is lowered from the entrance part 13.
The air flow D is drawn between the lower surface and the upper surface of the magnetic sheet S, and the air flow D is discharged from the exhaust hole 18.
Since the cushioning action of 2 suppresses flapping of the outer periphery, it becomes possible to horizontally extend and rotate as if it were a single IJ rigid disk.

As described above, the magnetic head (not shown) of the VSRI is brought close to or in contact with the magnetic layer surface, ie, the upper surface, of the magnetic sheet S that is rotationally levitated through the elongated hole 14 to continue magnetic recording or reproduction. Magnetic sheet S and cartridge 10
Dust attached or generated inside the air flow D and D
Since the inside of the cartridge 10 is constantly cleaned by being discharged to the outside by the dust particles 2, the instability of the playback output due to the dust is reduced.

On the other hand, when the cartridge 10 is removed from the VSRI, the coupling member 30 and the coupling pin 33 can be easily separated by pulling up the cartridge jo while rotating it in the opposite direction to the rotational direction of the magnetic sheet S. I can do it.

Note that instead of the guide means 24, a metal whose bending rigidity and elasticity are appropriately selected and whose one end is fixed to the inner surface of the side plate 18 and the other end is fixed to the upper or lower surface of the substrate 19 is used. strips or plastic strips may also be used.

Furthermore, instead of the ball bearing 201, a metal bearing member may be used.

FIG. 4 shows another embodiment of the cartridge of the present invention, and its characteristic feature is that the external components of the cartridge 10 are vertically symmetrically arranged and two magnetic sheets S are arranged. By making it possible to store magnetic sheets S and reversing the mounting direction with respect to the VSR, magnetic recording or reproduction on one magnetic sheet S can be quickly switched.

That is, "the lower plate 15 is placed opposite the outermost hole 14 of the upper plate 12.
A long hole 14' is provided in the side plate 17, and an elongated hole 14' is provided in the side plate 17.
When an exhaust hole 8' is provided below in symmetry with 8, a plurality of air supply holes 34 are provided in the center of both.

Further, a post member 35 is provided protruding below the center of the board 19.
The substrate 19' is fixed at its central part by the substrate 19', and its upper surface has a constant gap E from the lower surface of the substrate 19.
Coupling portions 30, 30' having catch seats 28, 28' and L-shaped grooves 32, 32' cut out at the upper and lower ends, respectively, are screwed into the center of the post member 35, and the journal Even if the output shaft 5 is coupled to either the coupling member 30 or 30' by inserting a rotator 21 having ball bearings 20, 20' attached to the base plate 19 and 19, ' is constructed so that rotation in the direction of arrow C is transmitted from the output shaft 5.

A ventilation hole 22' is transparently provided around the center of the substrate 19', facing the ventilation hole 22 of the substrate 19.

As mentioned above, by vertically symmetrically arranging the external components, one more magnetic sheet S can be stored compared to the cartridge of the present invention shown in FIG. , 28' and coupling section 30, 30
The two magnetic sheets S, whose central portions are fixed by ', are subject to a far zero force due to rotation and a gap E in front of the air supply hole 34, regardless of the vertical arrangement position of the substrates 19 and 19'.
The air flow D flows into the exhaust holes i8, 18' via the ventilation holes 22, 22', and the air flow D flows from the exit port 13 to the exhaust hole 1.
8 and the substrate 19, due to the cushioning effect of the air D2 flowing from the closing portions 3 and 16 to the exhaust hole 18', respectively.
It extends horizontally like a rigid disk and rotates and floats while maintaining a uniform gap with the outer surface of the magnetic head 19'. Magnetic recording or reproduction on the sheet S becomes possible. Note that instead of the substrate 2 of the VSRI, a container support means capable of locking the container 11 so that the container 11 does not rotate with the rotation of the output shaft 5 is disposed below the upper end of the output shaft 5. You can also set it up.

The cartridge of the present invention described above has the following novel effects. - The rotor 21, which can fix the vicinity of the center hole Sa of the magnetic sheet S, is mounted in the center, and the substrate 19, whose vertical movement is regulated within a certain range by the guide means 24, is attached to the base plate 19. container 1
1, it is possible to store the magnetic sheet S stably regardless of the flatness of the upper plate 12 or the lower slope 15, and to rotate and levitate it almost horizontally. It is now possible to house, store, and rotate the magnetic sheet S without causing or adhering scratches, creases, dust, etc. to the surface of the magnetic sheet S due to sliding contact with the inner surface of the cartridge 1.

'21 Also, as mentioned above, the rotational levitation of the magnetic sheet S does not depend on the flatness of the upper plate 12 and the lower slope 15, so it becomes possible to store a large number of the cartridges 1 in a stacked manner. It is now possible to save storage space.
'31 Furthermore, if the board I9' is installed below the board 19, the number of magnetic sheets stored per cartridge increases.
1, it is now possible to quickly switch the magnetic sheets S.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an embodiment of the cartridge of the present invention, FIG. 2 is an enlarged cutaway view of section A in FIG. 1, and FIG. 3 is an enlarged perspective view of section B in FIG. FIG. 4 is a partially cutaway side view of another embodiment of the cartridge of the present invention. 1 is a VSR, 5 is an output shaft, 10 is a cartridge, 11 is a container, 19 and 19' are substrates, 21 is a rotor, 24 is a guide means, and S is a magnetic sheet. Traditional illustration crab 2 illustration food 3 illustration *4 illustration

Claims (1)

[Claims] 1. A rotator rotatably supported by a bearing is installed in the center of a flat container consisting of an upper plate, a lower plate, and a side plate, and a plurality of ventilation holes are provided around the center. What is claimed is: 1. A cartridge for a magnetic sheet, wherein a flat substrate is housed therein, and a protrusion protruding from the outer peripheral edge of the substrate is engaged with a guide groove of a guide means provided along an inner wall of the side plate.